CN101438226B - key encoder input module - Google Patents

Abstract

The invention discloses a key encoder input module which is used for a keyboard and utilizes light to transmit signals, and has the characteristic of low manufacturing cost. This key encoder input module includes input circuit controller, sets up keycap, a plurality of signal transmitter and the receiver that is connected with the elastomer on the casing, characterized by: the key optical switch is arranged below the keycap, a signal sent by the signal transmitter passes through the key optical switch) corresponds to the optical input end of the optical splitter, and the optical splitter is communicated with the receiver through the optical path of the optical splitter to form an optical encoder; when the key cap is pressed down, the signal transmitter is conducted with the light path of the receiver to form a light splitting light path after passing through the key light switch and the light splitter arranged and combined with the light path, and the optical encoder outputs a group of key code signals corresponding to the key positions of the key cap to the input circuit controller. The key encoder input module has the advantages of simple structure, basically equivalent cost to the traditional keyboard and less number of used photoelectric elements. Taking a computer keyboard as an example, a photoelectric conversion circuit with a receiver of 5 sleeves is usually only needed to generate key codes of 2 powers of 5, 32 groups of key codes are counted, the receiver does not need to directly correspond to an optical switch with row keys, the photoelectric conversion circuit with the receiver can be arranged on the same printed board with a transmitter and a main control chip, and the photoelectric conversion circuit with the receiver has the characteristics of compact and simple circuit structure, low production cost and easy organization of batch production, and can conveniently adopt sealing measures for a small printed board so as to meet the requirement of integral water resistance of the keyboard and even use in water. The key encoder input module can be widely applied to the fields of computer keyboards, IC card telephone keyboards, automatic teller machine keyboards, remote controls of various household appliances, telephone keyboards, function switches, membrane switches and the like.

Description

The key encoder load module

Affiliated technical field

The present invention relates to a kind of signal transmission module that is used for keyboard, especially utilize light to carry out the load module of signal transmission.

Background technology

Existing key encoder load module, as shown in figure 11, adopt key reflected light electric switch circuit, when button is pressed, the key reflecting surface will be gone the different frequency signals that signal projector sends and be reflexed to the row receiver, handle by the input circuit controller then, obtain a corresponding key signal of each position keys.In order to distinguish the key of each key, each row must have one, and to be with the row receiver of photoelectric switching circuit directly corresponding with the key reflecting surface, with the computer keyboard is example, have under the situation of 6 row, 21 row at it, this scheme need have 21 row receivers (containing 21 cover photoelectric switching circuits) corresponding with the key reflecting surface of button altogether, this technical scheme is only fixed the required printed board of 21 cover row receivers and just is about 400mm,photoelectric switching circuit 21 covers, the required number of elements of this scheme is big, huge and the complex structure of circuit, the production cost height, be difficult for taking waterproof measure, being difficult for tissue produces in batches, its production cost is several times of conventional keyboard, has had a strong impact on promoting the use of of PKB photoelectric keyboard.

Summary of the invention

Technical matters to be solved by this invention provides the low key encoder load module of a kind of cost of manufacture.

The technical solution adopted for the present invention to solve the technical problems is: this key encoder load module comprises input circuit controller, signal projector, receiver, is arranged on the casing and is connected with elastomeric keycap, it is characterized in that: also comprise optical splitter, the keycap below is provided with the key photoswitch, the signal that signal projector sends is corresponding with the light input end of optical splitter by the key photoswitch, and optical splitter is communicated with the receiver light path and forms optical encoder; When keycap is depressed, after signal projector passes through key photoswitch and the optical splitter to the light path permutation and combination, form the beam split light path with the receiver conducting light paths, optical encoder is exported one group of key signal corresponding with the key position of keycap to the input circuit controller.

Further be, at each row signalization transmitter, will be from the reflected light signal of key photoswitch through after the beam split by light input end corresponding to theoptical splitter 18 of each row, the one or more beam split light paths that form respectively with one or more receiver conducting light paths, the beam split light path that the key photoswitch of same row forms is identical with the corresponding Rankine-Hugoniot relations of receiver, and the beam split light path that the key photoswitch of different lines forms is inequality with the corresponding Rankine-Hugoniot relations of receiver.

Further be that in technique scheme, the key photoswitch is made of be in the light face photoswitch or displacement fiber-optical switch of the corresponding key reflecting surface of light signal photoswitch, key with the light input end of optical splitter and signal projector emission.

Further be, above-mentioned optical splitter adopts and constitutes the one or more by forming with the corresponding unit of receiver reflecting surface respectively that certain corresponding relation is arranged of key reflecting surface, and reflecting surface reflection in unit forms the beam split light path from light to the receiver of signal projector.

Further be, optical splitter adopt one or more by certain corresponding relation arrange and respectively with key photoswitch and the corresponding transparent prism of receiver, planar-light guide, light transmitting fiber or light groove reflecting surface.

Further be the extension formation key reflecting surface photoswitch that is arranged on the keycap below and links with keycap.

Further be, be arranged on keycap below and and the extending part of keycap interlock between tree-shaped minute photon photoconduction and the sub-photoconduction both ends of the surface of tree-shaped incident and form the key face photoswitch that is in the light.

Further be, be arranged on keycap below and fixedly connected a free end of tree-shaped minute photon photoconduction or the sub-photoconduction of tree-shaped incident with the extension of keycap interlock, this free end respectively with the corresponding formation displacement of the end face fiber-optical switch of sub-photoconduction of tree-shaped incident or tree-shaped minute photon photoconduction; One end of a plurality of tree-shaped minute photon photoconduction and tree-shaped beam split key light are led and are crossed, and its other end is corresponding with the front end of the sub-photoconduction of tree-shaped incident, and the front end that tree-shaped beam split key light is led is corresponding with signal projector; The art end of the sub-photoconduction of a plurality of tree-shaped incidents and tree-shaped incident key light are led and are crossed, and the end that tree-shaped incident key light is led is corresponding with the light input end of optical splitter.

Good effect of the present invention is: have simple in structure, cost and conventional keyboard substantially quite, use the few advantage of photovalve quantity.With the computer keyboard is example, the photoelectric switching circuit that only need contain 5 cover receivers usually, produce 5 a powers key of 2, amount to 32 groups of keys, and receiver does not need directly corresponding with the photoswitch of row key, the photoelectric switching circuit that contains receiver can be arranged on transmitter, same printed board of main control chip on, it is simply compact that it has circuit structure, production cost is low, easily organize the characteristics of producing in batches, can take seal approach to a fritter printed board easily, reaching the keyboard integral waterproofing, even the requirement that can in water, use.This key encoder load module can be widely used in fields such as computer keyboard, IC Card Telephone keyboard, Automatic Teller Machine keyboard, all kinds of household appliance remote control, telephone keypad, functional switch, thin film switch.

Description of drawings

Fig. 1 is a front view of the present invention;

Fig. 2 is the A-A cut-open view of the Fig. 1 when being reflecting surface of the key photoswitch under the button;

Fig. 3 is the 3rd a layer of photoconduction of planar-light guide of the present invention;

Fig. 4 is the second layer photoconduction of planar-light guide of the present invention;

Fig. 5 is the ground floor photoconduction of planar-light guide of the present invention;

Fig. 6 is the scheme of the key position of multiple row of the present invention, multirow;

Fig. 7 is the optical splitter that optical fiber of the present invention forms;

Fig. 8 is the optical splitter that prism of the present invention forms;

Fig. 9 is the optical splitter that smooth groove reflecting surface of the present invention forms;

Figure 10 is the optical splitter that tree-shaped photoconduction of the present invention forms;

Figure 11 is the optical splitter that unit of the present invention reflecting surface forms;

Figure 12 is the optical splitter that the unit reflecting surface of the single transmitter of the present invention forms;

Figure 13 is that the key photoswitch under the button is the A-A cut-open view of Fig. 1 when being in the light face;

Figure 14 is the break-make synoptic diagram that key photoswitch of the present invention is the displacement fiber switch;

Figure 15 is Figure 14 B-B cut-open view;

Figure 16 is existing key reflecting surface, multiple collector scheme;

Figure 17 is a photoelectric switching circuit used in the present invention.

Embodiment

As Fig. 1～shown in Figure 16, key encoder load module of the present invention, comprise input circuit controller, one ormore signal projector 11, a plurality ofreceiver 20, be arranged on the casing and be connected with thekeycap 1 and theoptical splitter 18 of elastic body 7,keycap 1 below is provided with the key photoswitch, the signal thatsignal projector 11 sends is corresponding with thelight input end 15 ofoptical splitter 18 by the key photoswitch, is communicated with byoptical splitter 18 light paths betweenoptical splitter 18 and thereceiver 20 and formsoptical encoder 19; Whenkeycap 1 is depressed, aftersignal projector 11 passes through key photoswitch and theoptical splitter 18 to the light path permutation and combination, form beamsplit light path 16 withreceiver 20 conducting light paths,optical encoder 19 is exported one group of key signal corresponding with the key position ofkeycap 1 to the input circuit controller.Distinguish each different key bit position by one group of key signal, thereby effectively reduce the quantity of photoelectric original, reach the purpose that reduces cost of manufacture.

For computer keyboard commonly used, its line number is greatly less than columns.Therefore, for further reducing the quantity of photoelectric original, can adopt at eachrow signalization transmitter 11, bylight input end 15 corresponding to theoptical splitter 18 of each row in the future to the reflected light signal of key photoswitch through after the beam split, the one or more beamsplit light paths 16 that form respectively with one ormore receiver 20 conducting light paths, the beamsplit light path 16 of same row is identical with the corresponding Rankine-Hugoniot relations ofreceiver 20, the beamsplit light path 16 of different lines is inequality with the corresponding Rankine-Hugoniot relations ofreceiver 20, thereby utilize the light path permutation and combination is obtained the one group key signal corresponding with the key position ofkeycap 1, distinguish each different key bit position.

Above-mentioned key photoswitch is made of be in the light face photoswitch or displacement fiber-optical switch of the corresponding key reflecting surface of light signal photoswitch, key with thelight input end 15 ofoptical splitter 18 andsignal projector 11 emissions.

Above-mentionedoptical splitter 18 adopts and constitutes the one or more by forming withreceiver 20 correspondingunit reflectings surface 33 respectively that certain corresponding relation is arranged of key reflecting surface photoswitch, and reflectingsurface 33 reflections in unit form beamsplit light path 16 from light to thereceiver 20 of signal projector 11.At this moment,unit reflecting surface 33 plays the effect of key reflecting surface photoswitch andoptical splitter 18 simultaneously.

Above-mentionedoptical splitter 18 adopt one or more by certain corresponding relation arrange and respectively with key photoswitch andreceiver 20 correspondingtransparent prism 27, planar-light guide,light transmitting fiber 26 or lightgroove reflecting surface 30.

In the technique scheme, can adopt to be arranged onkeycap 1 below and to constitute key reflecting surface photoswitch with the extension ofkeycap 1 interlock, also can adopt be arranged onkeycap 1 below and and theextension 13 ofkeycap 1 interlock between tree-shapedminute photon photoconduction 36 andsub-photoconduction 38 both ends of the surface of tree-shaped incident and form the key face photoswitch that is in the light.

In the technique scheme, be arranged onkeycap 1 below and fixedly connected a free end of tree-shapedminute photon photoconduction 36 or thesub-photoconduction 38 of tree-shaped incident with theextension 13 ofkeycap 1 interlock, this free end respectively with the corresponding formation displacement of the end face fiber-optical switch ofsub-photoconduction 38 of tree-shaped incident or tree-shapedminute photon photoconduction 36; One end of a plurality of tree-shapedminute photon photoconduction 36 and tree-shaped beam split key light are led 35 and are crossed, and its other end is corresponding with the front end of thesub-photoconduction 38 of tree-shaped incident, and it is corresponding withsignal projector 11 that tree-shaped beam split key light is led 35 front end; The end of thesub-photoconduction 38 of a plurality of tree-shaped incidents and tree-shaped incident key light are led 37 and are crossed, and it is corresponding with thelight input end 15 ofoptical splitter 18 that tree-shaped incident key light is led 37 end.

In technique scheme, the formation of beamsplit light path 16 can be reflected the light signal that comes totransmitter 11 respectively toreceiver 20 by the one or moreunit reflecting surface 33 on theextension 13; A tree-shapedminute photon photoconduction 36 that also can be respectively be in the light that face,extension 13 connect byextension 13 reflectings surface,extension 13 or a free end of thesub-photoconduction 38 of tree-shaped incident, respectively reflection or conducting come to the light signal oftransmitter 11 to thelight input end 15 of theoptical splitter 18 ofreceiver 20 conducting light paths, form byoptical splitter 18 beam split.

Embodiment 1

Referring to Fig. 1, Fig. 2, the button that the present invention is listed as by horizontally-arranged,signal projector 11, elastic body 7, housing,extension 13,optical encoder 19, optical input circuit controller (not shown) etc. constitute.

It is recessed plate shaped to be the middle part referring to Fig. 1, Fig. 2 panel 3, and the panel throughhole 9 of uniform horizontally-arranged row is arranged on theconcave bottom surface 4 that is square in themiddle.Base plate 6 is plate shaped, and panel 3 connects into hollow and housing that the plate face is parallel to each other withbase plate 6 by fourroot posts 5, and near the lower surface the left part ofbase plate 6 has theleft erect plate 12 that is separately installed withsignal projector 11,receiver 20.

Referring to the top of Fig. 1keycap 1 and the key guide way 2 formation button that is connected, the bottom surface of elastic body 7 is connected with the upper surface ofbase plate 6, its top is connected with the bottom surface of theshoulder 10 of key guide way 2, panel throughhole 9 on the outside surface of the middle and upper part of key guide way 2 and the panel 3 is slidingly matched, and is crushed on the lower surface of recessedbottom surface 4 at the upper surface of elastic body 7 elastic force effectlower shoulders 10.

Referring to theshoulder 10 downward extensions on the key guide way 2 of the button of Fig. 1,2 horizontally-arrangedsrow extension 13 is arranged, the through hole that theextension 13 ofshoulder 10 is passed down through elastic body 7 tops penetrates in the base plate throughhole 8.

In the time of should making the upper surface ofshoulder 10 be crushed on the lower surface ofrecessed bottom surface 4 referring to Fig. 1, the plane at the emission ofreceiver 20,signal projector 11, the axis place of received signal is lower than someextensions 13 of arranging in length and breadth.The surface that theextension 13 and thelight input end 15 ofsignal projector 11, planar-light guide group is corresponding is respectively sticked reflectorized material and is promptly formedextension 13 reflectings surface.

The signal that someextensions 13 reflectings surface of horizontally-arranged row can reflectedsignal transmitter 11 send when button was not pressed; When button was pressed, thesignal projector 11 of Y0 was corresponding with eachkey extension 13 reflecting surface of corresponding line Y0 respectively.

The key photoswitch is arranged on the light path that thelight input end 15 that can makeoptical splitter 18 andsignal projector 11 light paths are communicated with, the key photoswitch is a key reflecting surface switch, and key reflecting surface switch is by moving up and down withkeycap 1 interlock and constitute withlight input end 15corresponding extension 13 reflectings surface, the elastic body 7 ofsignal projector 11, planar-light guide group respectively.

Extension 13 reflectings surface with X1, X2, X5, X6 place are corresponding respectively referring to thelight input end 15 of Fig. 3 planar-light guide 22; Itslight output end 21 is corresponding withb receiver 20.

Key extension 13 reflectings surface with X3, X4, X5, X6 place are corresponding respectively referring to thelight input end 15 of Fig. 4 planar-light guide 23; Itslight output end 21 is corresponding with areceiver 20.

Key extension 13 reflectings surface with X0, X2, X4, X6 place are corresponding respectively referring to thelight input end 15 of Fig. 5 planar-light guide 24; Itslight output end 21 is corresponding withc receiver 20.

Constitute byreceiver 20 and photoelectric switching circuit thereof,optical splitter 18 referring to Fig. 2optical encoder 19,optical splitter 18 was made of 24 3 stacked adding of planar-light guide 22, planar-light guide 23, planar-light guide, and thelight input end 15 of each planar-light guide ofoptical splitter 18 is corresponding withextension 13 reflectings surface respectively by certain arrangement; The light output end 21 of each planar-light guide ofoptical splitter 18 is corresponding one by one withreceiver 20 respectively by certain arrangement.

Form inputoptical signals 14 with corresponding each thekey extension 13 reflecting surface reflected signal ofsignal projector 11, inputoptical signal 14 is forming beamsplit light path 16 by 24 3 stacked adding in theoptical splitter 18 that constitutes of planar-light guide 22, planar-light guide 23, planar-light guide.

For improving the propagation efficiency of light, planar-light guide 22, planar-light guide 23, planar-light guide 24 also can be made cylindrical similar tree-shaped photoconduction as shown in figure 10.Tree-shaped photoconduction leads 32 by one end andreceiver 20 corresponding tree-shaped key lights, and tree-shaped sub-photoconduction 31 one ends and tree-shaped key light are led the formation light-path that crosses; Its other end is thatlight input end 15 is corresponding with inputoptical signal 14.

Signal projector 11 is electrically connected with input circuit controller (not shown), is electrically connected through photoelectric switching circuit and input circuit controller (not shown) referring to Figure 17receiver 20.

Whensignal projector 11 adopted the light wave transmitter,receiver 20 can be photosensitive devices such as photoresistance, photodiode, phototriode; Whensignal projector 11 adopted electromagnetic wave, sound wave,receiver 20 also can adopt electromagnetic wave, sonic sensor.

When thekeycap 1 of horizontally-arranged row was not pressed,receiver 20 did not receive the signal thatsignal projector 11 sends; Be pressed to be example withX5 place keycap 1, when thekeycap 1 at X5 place is pressed, the elastic force that the key guide way 2 thatkeycap 1 promotes to be attached thereto overcomes elastic body 7 moves down, when key guide way 2 moves down certain distance, theX5 key extension 13 reflectings surface reflection on the key guide way 2 and the signal of correspondingY0 signal projector 11 emissions of this key, becausekey extension 13 reflectings surface at X5 place and the planar-light guide 22 ofoptical splitter 18,light input end 15 correspondences of planar-light guide 23, thelight input end 15 of inputoptical signal 14 incidentoptical splitters 18, enteroptical splitter 18 back beam split, in planar-light guide 22, form beamsplit light path 16 in the planar-light guide 23, because planar-light guide 22, thelight output end 21 of planar-light guide 23 respectively withb receiver 20, areceiver 20 is corresponding respectively,input b receiver 20, the light of areceiver 20 amplifies the output high level through photoelectric switching circuit again, because the photoelectric switching circuit output low level that the 20 unglazed inputs of c receiver are attached thereto, photoelectric switching circuit is with the key 110 input circuit controller (not shown)s at X5 place.

The input circuit controller (not shown) of key photoswitch optical encoder load module, according to the differentiation of c, b, areceiver 20 place's high-low levels (011): thebutton 1 at X5 place is pressed.

According to the various combination of c, b, areceiver 20 place's high-low levels, determine row, corresponding relation is as follows

001--X0、010--X1、011--X2、100--X3、101--X4、110--X5、111--X6

Embodiment 2

Lead 35 front end referring to Figure 13signal projector 11 and tree-shaped beam split key light corresponding, one end of some tree-shapedminute photon photoconduction 36 and tree-shaped beam split key light are led 35 and are crossed, its other end is corresponding with the front end of thesub-photoconduction 38 of tree-shaped incident, the end of thesub-photoconduction 38 of tree-shaped incident and tree-shaped incident key light are led 37 and are crossed, and it is corresponding with thelight input end 15 ofoptical splitter 18 that tree-shaped incident key light is led 37 end; And the extension moving up and down 13 ofkeycap 1 interlock is in the light face between tree-shaped minute sub-photoconduction 38 both ends of the surface ofphoton photoconduction 36 tree-shaped incidents.

Referring to Figure 13 have flat crouch be tree structure by the tree-shaped beam split photoconduction that one end andsignal projector 11 corresponding tree-shaped beam split key lights lead 35, tree-shapedminute photon photoconduction 36 constitutes, some tree-shapedminute photon photoconduction 36 and tree-shaped beam split key light are led 35 and are crossed and be connected; By erect be tree structure and by the tree-shaped incident photoconduction that thelight input end 15 corresponding tree-shaped incident key lights of one end andoptical splitter 18lead 37, thesub-photoconduction 38 of tree-shaped incident is formed, thesub-photoconduction 38 of some tree-shaped incidents and tree-shaped incident key light are led 37 and are crossed and be connected.

Tree-shaped beam split photoconduction, tree-shaped incident photoconduction can be light groove photoconduction, fibre-optic light guide, liquid light guide, planar-light guide etc.

Referring to theshoulder 10 downward extensions on the key guide way 2 of the button of Fig. 1 horizontally-arrangedrow extension 13 is arranged, the through hole that theextension 13 under theshoulder 10 is passed down through elastic body 7 tops penetrates in the base plate through hole 8.Referring to Figure 13extension 13 between the end face of corresponding tree-shapedminute photon photoconduction 36 of its both ends of the surface, thesub-photoconduction 38 of tree-shaped incident, should make that to lead an end of 35 by the tree-shaped beam split key light of tree-shaped beam split photoconduction corresponding withsignal projector 11, one end of some tree-shaped beam splitlight paths 36 and tree-shaped beam split key light are led 35 and are crossed, and its other end is corresponding with theextension 13 under the button respectively; One end of thesub-photoconduction 38 of some tree-shaped incident of tree-shaped incident photoconduction is corresponding with theextension 13 under the button respectively; Its other end and tree-shaped incident key light are led 37 and are crossed, and it is corresponding with thelight input end 15 ofoptical splitter 18 that tree-shaped incident key light is led 37 end.

The key photoswitch is arranged on the light path that thelight input end 15 that can makeoptical splitter 18 andsignal projector 11 light paths are communicated with, the key photoswitch is the key face switch that is in the light, and key is in the light the face switch by its both ends of the surface corresponding tree-shapedminute photon photoconduction 36, thesub-photoconduction 38 of tree-shaped incident and constitute between its end face and withkeycap 1interlock extension 13 moving up and down.

The tree-shaped beam split photoconduction of the signal incident that signalprojector 11 sends: light signal along tree-shaped beam splitkey light lead 35, tree-shapedminute photon photoconduction 36 propagate, end in tree-shapedminute photon photoconduction 36 penetrates, and the light signal of the end output of some andbutton extension 13 corresponding tree-shapedminute photon photoconduction 36 down is not by 13 obstructs of key extension when button is pressed; Referring to Figure 12 when the button at X5 place is pressed, the light signal of the end output of tree-shapedminute photon photoconduction 36 is injected an end of thesub-photoconduction 38 of tree-shaped incident, and light signal is led 37 by thesub-photoconduction 38 of tree-shaped incident, tree-shaped incident key light signal imported thelight input end 15 ofoptical splitter 18.

All the other andembodiment 1 are together.

Embodiment 3

End referring to the downward extension of the shoulder on the key guide way 2 of Figure 14button 10 13 fixedly connected tree-shapedminute photon photoconduction 36, the other end of tree-shapedminute photon photoconduction 36 and tree-shaped beam split key light are led 35 and are crossed, and thesub-photoconduction 38 of tree-shaped incident is not corresponding with the end face of tree-shapedminute photon photoconduction 36 when button is pressed.

The key photoswitch is arranged on the light path that thelight input end 15 that can makeoptical splitter 18 andsignal projector 11 light paths are communicated with, the key photoswitch is the bond shifting fiber switch, and its both ends of the surface corresponding tree-shapedminute photon photoconduction 36, thesub-photoconduction 38 of tree-shaped incident and fixedly connected tree-shapedminute photon photoconduction 36 free ends can constitute with theextension 13 ofkeycap 1 interlock when the bond shifting fiber switch was pressed by button.

Referring to Figure 15 have flat crouch be tree structure by the tree-shaped beam split photoconduction that one end andsignal projector 11 corresponding tree-shaped beam split key lights lead 35, tree-shapedminute photon photoconduction 36 constitutes, some tree-shapedminute photon photoconduction 36 and tree-shaped beam split key light are led 35 and are crossed and be connected; By erect be tree structure and by the tree-shaped incident photoconduction that thelight input end 15 corresponding tree-shaped incident key lights of one end andoptical splitter 18lead 37, thesub-photoconduction 38 of tree-shaped incident is formed, thesub-photoconduction 38 of some tree-shaped incidents and tree-shaped incident key light are led 37 and are crossed and be connected.

When the button end is pressed because tree-shapedminute photon photoconduction 36 is not corresponding with the end face of thesub-photoconduction 38 of tree-shaped incident, the end face that the end ejaculation light signal of tree-shapedminute photon photoconduction 36 can not thesub-photoconduction 38 of the tree-shaped incident ofincident.Extension 13 moves down together with tree-shapedminute photon photoconduction 36 when button is pressed, end face to tree-shapedminute photon photoconduction 36 is corresponding with the end face of thesub-photoconduction 38 of tree-shaped incident, the end face of thesub-photoconduction 38 of the tree-shaped incident of light signal incident, light signal is led 37 along thesub-photoconduction 38 of tree-shaped incident, tree-shaped incident key light signal is imported thelight input end 15 ofoptical splitter 18.

All the other and embodiment 2 are together.

Embodiment 4

Constitute by the button of arranging in length and breadth,signal projector 11, elastic body 7, housing, key photoswitch,optical encoder 19, optical input circuit controller (not shown) etc. referring to Fig. 6 the present invention.

Near the left part ofbase plate 6 lower surface has the lefterect plate 12 that is separately installed withsignal projector 11,receiver 20, when button is pressed, thesignal projector 11 of Y0 corresponding with the key photoswitch of each key of corresponding line Y0 respectively (beY0 signal projector 11 is corresponding with the key photoswitch of each key of Y0,Y1 signal projector 11 is corresponding with the key photoswitch of each key of Y1,Y2 signal projector 11 corresponding) with the key photoswitch of each key of Y2.

On lefterect plate 12 tops opticalfiber receiving tube 24 is installed, the light input end ofoptical fiber 25 is positioned at the right ofbase plate 6 and corresponding withtransmitter 11, and the light output end ofoptical fiber 25 is corresponding with e, f, g opticalfiber receiving tube 24 respectively.

The arrangement mode that adopts Fig. 6 arranged evenly ofoptical fiber 25; When line number more also can adopt the optical splitter arrangement scheme ofembodiment 1,

Be electrically connected through photoelectric switching circuit and input circuit controller (not shown) referring to Fig. 6 opticalfiber receiving tube 24.

When key is not pressed, the key photoswitch of some keys of horizontally-arranged row can not form inputoptical signal 14 and be pressed to be example withX5Y1 place keycap 1, when thekeycap 1 at X5Y1 place is pressed, the key photoswitch of X5Y1 place key is when the signal that reflectedsignal transmitter 11 sends forms inputoptical signal 14, the input light of the capableoptical fiber 25 of blocking Y1, leaded light e byoptical fiber 25, g opticalfiber receiving tube 24 receives light, f opticalfiber receiving tube 24 can not receive light, opticalfiber receiving tube 24 passes through the change-over circuit (not shown) again with signal input circuit controller (not shown), thereby input circuit controller (not shown) is differentiated: thekeycap 1 at X5Y1 place is pressed.

Also can adopt progressive scan mode to distinguish line unit, input circuit controller (not shown) detected eachreceiver 20 and has or not the coding input when concrete mode was Y1signal projector 11 emission light signals, can judge then if any coding input that Y1 is capable has key to press, the Y1 line scanning finishes to close immediatelyY1 signal projector 11, subsequentlyY2 signal projector 11 emission light signals ...

All the other andembodiment 1 are together

Embodiment 5

Corresponding with the key photoswitch respectively by certain arrangement referring to Fig. 7optical splitter 18 by itslight input end 15; 26 groups of formations of light transmitting fiber that itslight output end 21 is corresponding withreceiver 20 respectively,optical encoder 19 is made of 26 groups of light transmitting fibers,receiver 20 and photoelectric switching circuit thereof, key photoswitch.Light transmitting fiber 26 is corresponding respectively withreceiver 20, and when inputoptical signal 14 incidentlight transmitting fibers 26 end faces werelight input end 15, beam splitlight path 16 formed at the inside surface of light transmittingfiber 26.

One end of one or morelight transmitting fiber 26 runs through the plate face oferect plate 17, and the inputoptical signal 14 that produces with the key photoswitch conducting of each row is corresponding respectively; It is corresponding withreceiver 20 respectively after the other end of light transmittingfiber 26 is fixing.

Inputoptical signal 14 is as follows with the corresponding relation ofreceiver 20

X0-input optical signal 14-light transmitting fiber 26-areceiver 20

X1 inputoptical signal 14--light transmitting fiber 26-b receiver 20

X2 inputoptical signal 14--light transmitting fiber 26 (two)-a,b receiver 20

X3 inputoptical signal 14--light transmitting fiber 26----c receiver 20

X4 inputoptical signal 14--light transmitting fiber (two) 26--a,c receiver 20

X5 inputoptical signal 14---light transmitting fiber (two) 26--b,c receiver 20

X6 inputoptical signal 14--light transmitting fiber (three) 26----a, b,c receiver 20

All the other andembodiment 1 are together.

Embodiment 6

Be made of for 27 groups by the corresponding transparent prism of certain arrangement withreceiver 20 respectively its prismatic reflection face 28 referring to Fig. 8optical splitter 18,optical encoder 19 is made of 27 groups of transparent prism,receiver 20 and photoelectric switching circuit thereof, key photoswitch.

When inputoptical signal 14 incident X5-a, X5-b placetransparent prism 27, inputoptical signal 14 entrance prism reflectings surface 28, formation and a,b receiver 20 corresponding two bundle beam split light paths, 16, two bundle beam splitlight paths 16 are passedtransparent prism 27 incident a, theb receiver 20 in the place ahead.

All the other andembodiment 1 are together.

Embodiment 7

Referring to Fig. 9optical splitter 18 by 30 groups of its light groove reflectings surface with constitute by certain arrangement corresponding relation with receiver 20.Optical encoder 19 is made of 30 groups of light groove reflectings surface,receiver 20 and photoelectric switching circuit thereof, key photoswitch.

Inputoptical signal 14 incident light groove reflectings surface 30 are in the interior formation beam splitlight path 16 oflight groove 29.

Inputoptical signal 14 is as follows with the corresponding relation of lightgroove reflecting surface 30

X0 inputoptical signal 14----a lightgroove reflecting surface 30

X1 inputoptical signal 14-----b lightgroove reflecting surface 30

X2 inputoptical signal 14----a, b light groove reflecting surface 30 (two)

X3 inputoptical signal 14-----c lightgroove reflecting surface 30

X4 inputoptical signal 14----a, c light groove reflecting surface 30 (two)

X5 inputoptical signal 14---b, c light groove reflecting surface 30 (two)

X6 inputoptical signal 14---a, b, c light groove reflecting surface 30 (three)

All the other andembodiment 1 are together.

Embodiment 8

By constituting by the correspondingunit reflecting surface 33 of certain Rankine-Hugoniot relations withreceiver 20,optical encoder 19 is made ofunit reflecting surface 33,receiver 20 and photoelectric switching circuit thereof referring to Figure 11optical splitter 18.

Unit reflecting surface 33 is made of corresponding withsignal projector 11,receiver 20 respectively one ormore extension 13 planes of posting reflectorized material.Whenbutton 1 is pressed, form by the corresponding beam splitlight path 16 of certain Rankine-Hugoniot relations andreceiver 20, should make the unit reflecting surface number of same row identical.

Thelight input end 15 of theoptical splitter 18 thatunit reflecting surface 33 forms be on theunit reflecting surface 33 withsignal projector 11 corresponding ends.

Thelight output end 21 of theoptical splitter 18 thatunit reflecting surface 33 forms be on theunit reflecting surface 33 withreceiver 20 corresponding ends.

When button is pressed, the key photoswitch moves down, the signal that signalprojector 11 sends is corresponding with thelight input end 15 of theoptical splitter 18 thatunit reflecting surface 33 forms, thelight output end 21 ofoptical splitter 18 is corresponding withreceiver 20, and theoptical splitter 18 thatunit reflecting surface 33 forms is communicated with formationoptical encoder 19 withreceiver 20 light paths;Receiver 20 corresponding relations with one or more are identical respectively should to make one or moreunit reflecting surface 33 of same row; One or moreunit reflecting surface 33 of different lines is inequality with one ormore receiver 20 corresponding relations respectively; One or more beam splitlight paths 16 of the light signal generating of eachunit reflecting surface 33 reflectedsignal transmitter 11 are corresponding one by one with one ormore receivers 20 respectively.

The key photoswitch is a key reflecting surface switch, key reflecting surface switch by moving up and down withkeycap 1 interlock and respectively withsignal projector 11,receiver 20corresponding extensions 13 onunit reflecting surface 33 constitute.

Extension 13 reflectings surface of each key of X0 row all have aunit reflecting surface 33 corresponding with areceiver 20;

Extension 13 reflectings surface of each key of X1 row all have aunit reflecting surface 33 corresponding withb receiver 20;

Extension 13 reflectings surface of each key of X2 row have two respectively with a,b receiver 20unit reflecting surface 33 one to one;

Extension 13 reflectings surface of each key of X3 row all have aunit reflecting surface 33 corresponding withc receiver 20;

Extension 13 reflectings surface of each key of X4 row all have two respectively with a,c receiver 20unit reflecting surface 33 one to one;

Extension 13 reflectings surface of each key of X5 row all have two respectively with b,c receiver 20unit reflecting surface 33 one to one;

Extension 13 reflectings surface of each key of X6 row all have three respectively with a, b,c receiver 20unit reflecting surface 33 one to one;

Reflection beam splittinglight path 16 is formed byunit reflecting surface 33 reflectedsignals.Signal projector 11 can be luminotron with different break-make frequency emission light signals, also can be that other type emitters is launched other different signal.

Signal projector 11, thereceiver 20 of emission different frequency are electrically connected with optical input circuit controller (not shown).

SupposeY0 signal projector 11 with 100 break-make frequency emissioning signals,Y1 signal projector 11 with 200 break-make frequency emissioning signals,Y2 signal projector 11 with 300 break-make frequency emissioning signals, the optical input circuit controller is differentiated according to the signal of the break-make frequency 300 that receives: the button that Y2 is capable is pressed.

All the other andembodiment 1 are together.

Embodiment 9

Corresponding withtransmitter 11, key photoswitch respectively referring to theprismatic reflection face 28a of Figure 12 transparent prism 27a, whenbutton 1 is pressed, form by the corresponding beam splitlight path 16 of certain Rankine-Hugoniot relations andreceiver 20, should make theunit reflecting surface 33 of each key all inequality withreceiver 20 corresponding relations, make each key that an independently key all be arranged, the key of each key as shown in figure 12.

All the other andembodiment 8 are together.

Claims (9)

1. key encoder load module, comprise input circuit controller, one or more signal projector (11), a plurality of receiver (20), be arranged on the casing and be connected with the keycap (1) of elastic body (7), it is characterized in that: also comprise optical splitter (18), keycap (1) below is provided with the key photoswitch, the signal that signal projector (11) sends is corresponding with the light input end (15) of optical splitter (18) by the key photoswitch, and optical splitter (18) is communicated with formation optical encoder (19) with receiver (20) light path; When keycap (1) when depressing, after the signal that signal projector (11) sends passes through key photoswitch and the optical splitter (18) to the light path permutation and combination, form beam split light path (16) with receiver (20) conducting light paths, optical encoder (19) is exported one group of key signal corresponding with the key position of keycap (1) to the input circuit controller.

2. key encoder load module as claimed in claim 1, it is characterized in that: at each row signalization transmitter (11), will be from the light signal of key photoswitch through after the beam split by light input end (15) corresponding to the optical splitter (18) of each row, the one or more beam split light paths (16) that form respectively with one or more receivers (20) conducting light paths, the same formed beam split light path of row key photoswitch (16) is identical with the corresponding Rankine-Hugoniot relations of receiver (20), and the formed beam split light path of different lines key photoswitch (16) is inequality with the corresponding Rankine-Hugoniot relations of receiver (20).

3. key encoder load module as claimed in claim 1 or 2, its feature is being: the key photoswitch constitutes by being arranged on be in the light face photoswitch or displacement fiber-optical switch of key reflecting surface photoswitch, key on the light path that the light input end (15) that can make optical splitter (18) and signal projector (11) light path be communicated with.

4. key encoder load module according to claim 3, its feature is being: optical splitter (18) adopt to constitute key reflecting surface photoswitch one or more by certain corresponding relation arrange respectively with receiver (20) corresponding unit reflecting surface (33), unit reflecting surface (33) reflection forms beam split light path (16) from light to the receiver (20) of signal projector (11).

5. key encoder load module according to claim 3, its feature is being: optical splitter (18) adopt one or more by certain corresponding relation arrange and respectively with key photoswitch and the corresponding transparent prism of receiver (20) (27), planar-light guide, tree-shaped photoconduction, light transmitting fiber (26) or light groove reflecting surface (30).

6. as claim 4 or 5 described key encoder load modules, its feature is being: extension (13) the formation key reflecting surface photoswitch that is arranged on keycap (1) below and links with keycap (1).

7. as claim 4 or 5 described key encoder load modules, its feature is being: be arranged on keycap (1) below and and the extension (13) of keycap (1) interlock be positioned between tree-shaped minute photon photoconduction (36) and the sub-photoconduction of tree-shaped incident (38) both ends of the surface and form the key face photoswitch that is in the light.

8. as claim 4 or 5 described key encoder load modules, its feature is being: be arranged on keycap (1) below and fixedly connected a free end of tree-shaped minute photon photoconduction (36) or the sub-photoconduction of tree-shaped incident (38) with the extension (13) of keycap (1) interlock, this free end respectively with the sub-photoconduction of tree-shaped incident (38) or tree-shaped minute the photon photoconduction (36) the corresponding formation displacement of end face fiber-optical switch.

9. key encoder load module as claimed in claim 1 or 2, its feature is being: a plurality of tree-shaped minute the photon photoconduction (36) an end and tree-shaped beam split key light lead (35) and cross, its other end is corresponding with the front end of the sub-photoconduction of tree-shaped incident (38), and the front end that tree-shaped beam split key light is led (35) is corresponding with signal projector (11); The end of the sub-photoconductions of a plurality of tree-shaped incidents (38) and tree-shaped incident key light are led (37) and are crossed, and the end that tree-shaped incident key light is led (37) is corresponding with the light input end (15) of optical splitter (18).

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