A kind of Novel reflection-type lensTechnical field
The utility model relates to plane Display Technique field, in particular a kind of Novel reflection-type lens.
Background technology
At present, fast development along with light emitting diode (LED), in field of backlights, light emitting diode (LED) backlight has little by little replaced traditional cold-cathode tube (CCFL) backlight, and early stage backlight is side entrance back, be mainly to convert spot light or line source to area source by LGP, along with the continuous increase of backlight panel, this side entrance back mechanism is subject to the impact of the factors such as light path, is no longer applicable to the demand of large scale liquid crystal display unit.And in down straight aphototropism mode set, rely on the technology such as cloth lamp and control lamp flexibly, and effectively improve the problem of light efficiency, be more adapted to large scale liquid crystal device.
As shown in Figure 1, Fig. 1 is the structural representation of existing white light down straight aphototropism mode set, existing white light down straight aphototropism mode set comprises the diffuser plate 1 and the bottom reflection plate 4 that be arranged in parallel up and down, is located at the LED light source 2 on bottom reflection plate 4, LED light source 2 is due to low in energy consumption, pollution-free, therefore volume is little, becomes one of light source using in backlight module; Because LED light source 2 is lambertian distribution light source, the hot spot of the middle top of its light source is less, therefore need more LED light source 2 in backlight module.
As shown in Figure 2, Fig. 2 is the structural representation of the existing down straight aphototropism mode set with reflective lens, in the existing down straight aphototropism mode set with reflective lens, above LED light source 2, increase a reflective lens 3, thereby the light that has changed LED light source 2 distributes, and has increased angle of flare, therefore also just increase greatly the facula area on diffuser plate 1, effectively reduce the usage quantity of LED light source 2, reduced the cost of down straight aphototropism mode set.
As shown in Figure 3, Fig. 3 is the fundamental diagram of the existing down straight aphototropism mode set with reflective lens, its operation principle is: when the light sending from LED light source 2 is incident to exit facet through the plane of incidence, part light generation total reflection, then refraction is penetrated from the side, and another part light directly reflects away through exit facet.Because near the light intensity central shaft of this reflective lens 3 is stronger, angle is less, thereby makes light skewness.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of Novel reflection-type lens are provided, the light that these Novel reflection-type lens send it is more even, improved the utilization rate of light, thereby improve overall brightness and the uniformity of down straight aphototropism mode set, can effectively reduce light mixing distance simultaneously.
The utility model is achieved through the following technical solutions:
A kind of Novel reflection-type lens, comprise bottom surface, be positioned at the incident curved surface of bottom, be positioned at the outgoing curved surface at top, and the side that connects described bottom surface and outgoing curved surface, described reflective lens is central rotation symmetry along its vertical central shaft, described incident curved surface indent forms incident cavity, in described incident cavity, hold light source is set, described outgoing curved surface indent forms outgoing cavity, on described incident curved surface and outgoing curved surface, be equipped with micro-structural, on described bottom surface, on a week of described incident cavity edge, be provided with the ring-type curved surface of indent, described ring-type curved surface is the curve-like being bent upwards on the vertical section of the vertical central shaft through described reflective lens, described incident curved surface, it is symmetrical that outgoing curved surface and ring-type curved surface are all central rotation along the vertical central shaft of described reflective lens, from described incident curved surface, incide a part of light in the light described outgoing curved surface, at described outgoing curved surface, total reflection occurs, light after the total reflection of outgoing curved surface is divided into two parts, part light reflection penetrates to described side and through the refraction of described side, another part light reflection, to the ring-type curved surface of described bottom surface indent, returns in lens with different angle reflections again through the light on described ring-type curved surface.
Optimization as above-mentioned Novel reflection-type lens technologies scheme, the vertical central shaft of described reflective lens of take is Y-axis, the horizontal linear vertical with Y-axis and bottom surface excessively of take is X-axis, the intersection point of X-axis and Y-axis of take is initial point, the coordinate (x, y) put on the cross section curve of each cross section of described outgoing curved surface meets: the value of y increases along with | the increase of x| value; The coordinate (x, y) put on the cross section curve of each cross section of described incident curved surface meets: the value of y reduces along with | the increase of x| value; The coordinate (x, y) put on the cross section curve of each cross section of described ring-type curved surface meets: the value of y first increases along with | the increase of x| value, and after reaching the peak of ring-type curved surface, the value of y is followed along with | the increase of x| value and reduced.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, the sectional area of the maximum cross section of described outgoing curved surface is greater than the sectional area of the maximum cross section of described incident curved surface.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, described side is two-period form side, and the first paragraph of described side is straight line and is connected with described outgoing curved surface; The second segment of described side is free curve and is connected with described bottom surface.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, the straight length of the first paragraph of described side is 2.5mm-3.5mm, its upper end be tilted to outer and with the angle of described vertical central shaft be 0 °-10 °.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, the camber of the free curve of the second segment of described side is 2mm-3mm, and the radius of putting on described free curve changes.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, described outgoing curved surface is 120 °-160 ° at the angle of crossing the place, Shang Qi summit, vertical section of vertical central shaft.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, described micro-structural is a plurality of prism microstructure.
As the optimization of above-mentioned Novel reflection-type lens technologies scheme, the bottom surface of described reflective lens is provided with locating dowel, and the height of described locating dowel is 0.2mm-0.8mm.
Optimization as above-mentioned Novel reflection-type lens technologies scheme, the peak of described ring-type curved surface is H to the distance of bottom surface, the peak of described ring-type curved surface is L2 to the distance of the vertical central shaft of described reflective lens, the ratio H/L2 < 0.17 of described H and described L2.
The utility model has the following advantages compared to existing technology:
1, at incident curved surface, be provided with micro-structural, can effectively adjust light through the diffusion angle of incident curved surface;
2, at outgoing curved surface, be provided with micro-structural, make the reflection angle of reflection ray present irregularities, uniformity while penetrating from reflective lens to increase light, the distribution of the light of reasonably controlling reflective lens top on diffuser plate, also can, by the density of suitable broken line, adjust the brightness at reflective lens center simultaneously;
3, the ring-type curved surface that is provided with indent in bottom surface, has changed the light angle that incides bottom surface, thereby makes whole distribution of light even;
4, the side of this reflective lens is two-period form structure, makes the emergent ray of side have upwards refraction and downward refraction angle, can effectively solve because light is too concentrated the problem that forms a speck, has greatly improved light utilization.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing white light down straight aphototropism mode set;
Fig. 2 is the structural representation of the existing down straight aphototropism mode set with reflective lens;
Fig. 3 is the fundamental diagram of the existing down straight aphototropism mode set with reflective lens;
Fig. 4 is the operation principle schematic diagram of Novel reflection-type lens of the present utility model;
Fig. 5 is the stereogram one of Novel reflection-type lens of the present utility model;
Fig. 6 is the stereogram two of Novel reflection-type lens of the present utility model;
Fig. 7 is the micro-structural structural representation on longitudinal profile on incident curved surface and outgoing curved surface.
The specific embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented take technical solutions of the utility model under prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Referring to Fig. 4, Fig. 5, Fig. 6, the Novel reflection-type lens that the utility model provides, reflective lens comprises bottom surface 38, be positioned at the incident curved surface 32 of bottom, be positioned at the outgoing curved surface 33 at top, and the side 31 that connects bottom surface 38 and outgoing curved surface 33, reflective lens is central rotation symmetry along its vertical central shaft, incident curved surface 32 indents form incident cavity 34, in incident cavity 34, hold light source is set, light source is LED light source 2, outgoing curved surface 33 indents form outgoing cavity 35, on incident curved surface 32 and outgoing curved surface 33, be equipped with micro-structural 37, on bottom surface 38, on a week of incident cavity 34 edges, be provided with the ring-type curved surface 36 of indent, ring-type curved surface 36 is the curve-like being bent upwards on the vertical section of the vertical central shaft through reflective lens, incident curved surface 32, it is symmetrical that outgoing curved surface 33 and ring-type curved surface 36 are all central rotation along the vertical central shaft of reflective lens.The bottom surface 38 of reflective lens is provided with locating dowel 39, and for reflective lens and PCB can be firmly buckled together, the quantity of locating dowel 39 is 4, and the height of locating dowel 39 is 0.2mm-0.8mm.The material of this reflective lens can be polymethyl methacrylate, Merlon, polystyrene or clear optical glass.
Referring to Fig. 4, the vertical central shaft of reflective lens of take is Y-axis, the horizontal linear vertical with Y-axis and bottom surface 38 excessively of take is X-axis, the intersection point of X-axis and Y-axis of take is initial point, the coordinate (x, y) put on the cross section curve of each cross section of outgoing curved surface 33 meets: the value of y increases along with | the increase of x| value; The coordinate (x, y) put on the cross section curve of each cross section of incident curved surface 32 meets: the value of y reduces along with | the increase of x| value; The coordinate (x, y) put on the cross section curve of each cross section of ring-type curved surface 36 meets: the value of y first increases along with | the increase of x| value, and after reaching the peak of ring-type curved surface 36, the value of y is followed along with | the increase of x| value and reduced.The sectional area of the maximum cross section of outgoing curved surface 33 is greater than the sectional area of the maximum cross section of incident curved surface 32; Outgoing curved surface 33 is 120 °-160 ° at the angle of crossing the place, Shang Qi summit, vertical section of vertical central shaft.
The operation principle of this reflective lens is: LED light source 2 is positioned at the incident cavity 34 of the center position of reflective lens bottom surface 38, the light that LED light source 2 sends is from the bottom surface 38 directive incident curved surfaces 32 of reflective lens, as can be seen from Figure 4, light after incident curved surface 32 can be divided into two parts, part light incides on outgoing curved surface 33, as the a1 light in Fig. 4, a2 light, b1 light; A part of light directly 31 reflects lens from the side in addition, as the c1 light in Fig. 4.And the light inciding on outgoing curved surface 33 can be divided into two parts, there is refraction and penetrate lens in a part of light, as a1 light in Fig. 4 on this outgoing curved surface 33; On this outgoing curved surface 33, there is total reflection in another part light, light after 33 total reflections of outgoing curved surface can be divided into two parts again, part light reflection penetrates to side 31 and through side 31 refractions, as b1 light in Fig. 4, another part light reflection is to the ring-type curved surface 36 of indent on bottom surface 38, then through the light on ring-type curved surface 36, with different angle reflections, go back again, as the a2 light in Fig. 4.Due to the ring-type curved surface 36 of indent being set on bottom surface 38, changed the light angle that incides bottom surface 38, thereby made whole distribution of light even, the uniformity while penetrating from lens to increase light.
If the peak of ring-type curved surface 36 is to bottom surface, 38 distance is H, the peak of ring-type curved surface 36 is L2 to the distance of the vertical central shaft of reflective lens, in order to obtain better diffusion effect, the ratio H/L2 < 0.17 of H and L2, because if H is too high, the light that can cause part is folded to vertical central shaft, thereby makes distribution of light inhomogeneous.If the peak of ring-type curved surface 36 is L1 to the horizontal range of the bottom of incident curved surface 32, when ratio H/L1<0.3 between H and L1, less for the brightness impact of lens centre.
Side 31 is set to two-period form side, and the first paragraph of side 31 311 is for straight line and be connected with outgoing curved surface 33, and the straight length of the first paragraph 311 of side 31 is 2.5mm-3.5mm, its upper end be tilted to outer and with the angle of vertical central shaft be 0 °-10 °; The second segment 312 of side 31 is for free curve and be connected with bottom surface 38, and the camber of the free curve of the second segment 312 of side 31 is 2mm-3mm, and the radius of putting on free curve changes.Because total reflection is returned from outgoing curved surface 33 light generally has large angle, so the first paragraph 312 of side 31 is mainly for by outgoing curved surface 33, the part reflection ray near side 31 reflects away, and shooting angle is larger, no matter through bottom reflection plate, 4 reflections still directly enter in diffuser plate 1 upward the light of this wide-angle down, only need less reflection, therefore higher to the utilization rate of light ray energy, and increased the size of hot spot.For the second segment 312 of side 31 be designed to that free curve makes part not through the reflection of outgoing curved surface 33 but the light that is directly incident on side 31 as c1 light, can there is a large angle of flare, increase the randomness of light, thereby improve the uniformity of whole backlight module.
Referring to Fig. 7, the micro-structural 37 on incident curved surface 32 and outgoing curved surface 33 is a plurality of prism microstructure simultaneously.Preferably, the angle of its every two sections of adjacent fold line 371 at its end points place is greater than 177 degree and is less than 180 degree, and its every section broken line 371 length are between 0.5mm-1mm.This micro-structural 37 is set on incident curved surface 32, can effectively increases light through the diffusion angle of incident curved surface 32; This micro-structural 37 is set on outgoing curved surface 33, can adjusts the distribution of light, also can, by the density of suitable broken line 371 is set, adjust the brightness of lens centre.
In sum, a kind of Novel reflection-type lens that the utility model provides, by be provided with micro-structural 37 on incident curved surface 32 and outgoing curved surface 33, the 38 ring-type curved surfaces 36 that are provided with indent in bottom surface, and side 31 is set to two-period form structure, the angle that finally makes light penetrate lens becomes large, and hot spot is even, can also reduce the light mixing distance of backlight module simultaneously.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.