CN111582028A - Luminous fingerprint button - Google Patents

Abstract

The invention discloses a luminous fingerprint key, which comprises a shell with a through hole, a fingerprint module arranged right opposite to the through hole and a backlight module arranged below the fingerprint module; the backlight module comprises a light guide plate with a light guide hole, a light source arranged in the light guide hole and a circuit board connected with the light source; the shell is provided with a light-transmitting area, and light emitted by the backlight module is displayed through the light-transmitting area. The invention can not only carry out fingerprint identification, but also has the function of backlight keys, has smaller integral thickness and is more energy-saving. Through setting up the multilayer shading for light shows more accurately, prevents the light leak scheduling problem from appearing.

Description

Luminous fingerprint button

Technical Field

The invention relates to a luminous fingerprint key.

Background

At present, electronic products increasingly pay more attention to safety performance, and more keyboards are applied with a fingerprint identification function. However, electronic products tend to develop in the direction of ultra-thin and ultra-light, and the thickness of the existing backlight key is increased greatly after the fingerprint identification function is added, so that the overall thickness of a computer or a keyboard is increased, and the operation comfort level is reduced.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a fingerprint key which is lighter, thinner and better in display effect and has a light-emitting function.

The technical scheme is as follows: the invention discloses a luminous fingerprint key, which comprises a shell with a through hole, a fingerprint module arranged right opposite to the through hole and a backlight module arranged below the fingerprint module; the backlight module comprises a light guide plate with a light guide hole or a light guide groove, a light source arranged in the light guide hole or the light guide groove and a circuit board connected with the light source; the shell is provided with a light-transmitting area, and light emitted by the backlight module is displayed through the light-transmitting area.

The backlight module also comprises a shading layer arranged on the light guide plate. The diameter of the light shielding layer is not smaller than that of the through hole.

An elastic switch is arranged below the backlight module.

The shell is provided with a shading film, and the area between the shading film and the edge of the through hole is a light transmission area.

The through holes are round, rectangular or in any other shape.

The number of the light sources is at least two.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:

(1) the invention can not only carry out fingerprint identification, but also has the function of backlight keys, has smaller integral thickness and is more energy-saving. Through setting up the multilayer shading for light shows more accurately, prevents the light leak scheduling problem from appearing.

(2) The invention displays different colors through different working states, thereby increasing the use convenience and ensuring better user experience.

Drawings

FIG. 1 is a schematic external view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a schematic diagram of the principle of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

As shown in fig. 1, thecasing 1 of the present invention is provided with athrough hole 12, thefingerprint module 2 is disposed under the throughhole 12, and thecasing 1 of the key is exposed out of thefingerprint module 2 through the throughhole 12, such that the casing directly contacts the fingerprint module when contacting the key.

In this embodiment, a light shielding film is disposed on the outer surface of thehousing 1, and the region between the light shielding film and the through hole is alight transmitting region 11. In other embodiments, thehousing 1 may be a combination of opaque material and transparent material, the opaque material is disposed outside, and the transparent material is disposed between the backlight module and the opaque material to form a light channel.

In this embodiment, thehousing 1 is stepped, as shown in figure 2, withdifferent diameter cavities 15 inside to accommodate different diameter sizes of internal components. In other embodiments, the side walls of thehousing 1 may be flat.

In the present embodiment, the light-transmittingregion 11 is located at the top end of the stepped housing, and the stepped side walls are all covered with the light-shielding film 13. Thecase 1 is made of a light-transmitting material, and thecase 1 and the light-shieldingfilm 13 form a light-guidingregion 14. The top end of the shell is provided with a throughhole 12, the throughhole 12 is round, square or any other shape, and the shape of theshell 1 can be adapted to the shape of the throughhole 12.

Just being equipped withfingerprint module 2 to this through-hole in the through-hole 12, this embodiment adopts general fingerprint module among the prior art, including modulemain part 21 and windingdisplacement 22. The diameter of through-hole 12 is not less than the diameter offingerprint module 2. Thefingerprint module 2 is arranged in the throughhole 12, and the height of the fingerprint module is flush with the top of the through hole, or the fingerprint module is arranged below the throughhole 12, namely, the height difference exists between the edge of the through hole and the module.

Fingerprint module 2 below is equipped withbacklight unit 4, still is equipped withlight shield layer 3 betweenbacklight unit 4 and thefingerprint module 2. The 3 diameters of light shield layer are not less than the 2 diameters of fingerprint module, guarantee that light can not expose from the gap between through-hole and the fingerprint module.

Thebacklight module 4 includes alight guide plate 40 and a circuit board 41, and thelight guide plate 40 is disposed above the circuit board 41. One or morelight sources 43 are arranged above the circuit board 41, thelight sources 43 are LED lamps, and thelight sources 43 can be different colors and display different colors according to states and functions. Thelight guide plate 40 is provided with a light guide hole or alight guide groove 42 corresponding to thelight source 43, so that thelight source 43 is just positioned in the light guide hole or thelight guide groove 42 after thelight guide plate 40 and the circuit board 41 are combined to form thewhole backlight module 4. The traditional key light source is arranged on one side or below the light guide plate, the whole thickness of the key is larger, the light guide efficiency is lower, the light guide plate and the light source are combined, the light shading layer and the light channel in the shell are combined, light is accurately displayed from the light transmitting area, the thickness of the key is reduced, the light guide plate covers the light source, the light guide efficiency is increased, and the energy consumption is reduced. The test proves that compared with the traditional structure, the integral thickness of the invention is reduced by about 3 mm.

The circuit board 41 is an FPC board, and both front and back surfaces thereof are provided with circuits. Anelastic switch 45 is also arranged below the circuit board 41 and used for conducting the circuit and resetting the pressed key.

Abottom plate 5 is arranged below thebacklight module 4 for supporting all the above structures, and the lower edge of thehousing 1 is assembled and fixed by hot melting or sticking. Thebottom plate 5 is further provided with aconvex edge 51, and theconvex edge 51 is provided with a mounting hole for mounting the assembled key to other structures.

The working principle of the invention is as follows:

the user presses the button, and elastic switch switches on, and key-press system circular telegram, and the backlight module light source is luminous after the circular telegram, and fingerprint module begins to carry out fingerprint authentication simultaneously. The key is more energy-saving when being electrified after being pressed. Light is displayed from the light-transmitting area through the light channel, as shown by arrows in fig. 3, and different colors are displayed according to the pressing state, such as conditions of fingerprint authentication, authentication success, and authentication failure. The elastic element enables the key to recover the original position under the action of elastic restoring force, and the key bounces.

Claims (8)

1. A luminous fingerprint key is characterized by comprising a shell (1) with a through hole (12), a fingerprint module (2) arranged right opposite to the through hole and a backlight module (4) arranged below the fingerprint module (2); the backlight module (4) comprises a light guide plate (40) with a light guide hole or a light guide groove (42), a light source (43) arranged in the light guide hole or the light guide groove and a circuit board (41) connected with the light source; the shell is provided with a light-transmitting area (11), and light emitted by the backlight module (4) is displayed through the light-transmitting area (11).

2. The luminous fingerprint key according to claim 1, wherein a light shielding layer (3) is arranged between the backlight module (4) and the fingerprint module (2).

3. The luminescent fingerprint key according to claim 2, wherein the diameter of the light shielding layer (3) is not smaller than the diameter of the through hole (12).

4. The illuminated fingerprint key according to claim 1, wherein an elastic switch (45) is arranged below the backlight module (4).

5. The luminous fingerprint key according to claim 1, wherein a light shielding film (13) is provided on the housing (1), and the region between the light shielding film (13) and the edge of the through hole (12) is a light transmission region (11).

6. The luminescent fingerprint key of claim 1, wherein the through hole (12) is circular or rectangular.

7. Luminous fingerprint key according to claim 1, characterized in that said light sources (43) are provided in at least two.

8. The illuminated fingerprint key according to claim 7, wherein said light source (43) displays different colors according to functional changes.

Images