CN201327787Y

CN201327787Y - Keypress light guiding structure

Info

Publication number: CN201327787Y
Application number: CNU200820303584XU
Authority: CN
Inventors: 王千龙
Original assignee: Kinpo Electronics Inc
Current assignee: Kinpo Electronics Inc
Priority date: 2008-12-23
Filing date: 2008-12-23
Publication date: 2009-10-14
Anticipated expiration: 2018-12-23

Abstract

The utility model relates to a keypress light guiding structure which at least comprises a light guiding plate. The light guiding plate is provided with a light entry surface and a light exit surface. The light entry surface is used for leading in light rays, and the light exit surface is intersected with the light entry surface. A through hole is arranged at the surface side of the light exit surface correspondingly to the position of a keypress, an operation zone which is corresponding to the keypress can be defined out at the periphery of the through hole, a plurality of diffuse reflection units which are protruded or sunken at the light exit surface are uniformly distributed within the range of the operation zone, and light reflection layers which can reflect the light rays are arranged on the surfaces of the diffuse reflection units. When the light rays emitted from the light guiding plate or from other light sources are reflected to the light exit surface of the light guiding plate from the outer part, by utilizing the light reflection layers of the diffuse reflection units, the light rays can be effectively reflected again to each keypress or the peripheral side of the keypress, so as to improve the backlight brightness of each part of the keypress.

Description

The key light guide structure

Technical field:

The utility model relates to a kind of key light guide structure, refers to especially a kind ofly promote the brightness of button position, and guarantees the even brightness light guide structure.

Background technology:

At present, how common electronic product (as: calculator, mobile phone) with button for ease of using, can provide a basic lighting source in its inside, to keep the required base lighting of operation push-button under the environment of night or insufficient light; More traditional, have as shown in Figure 1, it mainly comprises: a lighttight button 61, a leaded light component 6, an and luminescence component 62, wherein luminescence component 62 is disposed at button 61 back sides, and the light that luminescence component 62 is produced system appears towards the place ahead of button 61 through the leaded light component 6 around button 61, by the leaded light ability of leaded light component 6 and the means that reconfigure luminescence component 62 positions, light is interspersed among on the leaded light component 6 equably, to reach equalizing light rays and to avoid the purpose of local bright spot.

But, this kind structural design not only because luminescence component 62 that quantity is set is more and directly increase manufacturing cost, its integrated circuit design complexity improves and power consumption increases simultaneously, not value-for-money.

In addition, structure is as shown in Figure 2 arranged, it mainly is in a button 7 belows one bridge plate 72 to be set, and the base plate 71 that a table side combines with circuit board 73 is set at interval in these bridge plate 72 belows, between this bridge plate 72 and circuit board 73 (base plate 71), leave light source conduction space 761, and be provided with transmitting illuminant 76 in these light source conduction space 761 sides, and this bridge plate 72 is embedded with at least one light guide section 75 respectively in corresponding each button 7 position, and this light guide section 75 also can extend downward in this light source conduction space 761; During use, the light that this transmitting illuminant 76 is produced enters light source conduction space 761, can upwards be incident upon button 7 via light guide section 75 guiding refractions and form back lighting.

As shown in Figure 3, it is the backlight module that another kind is applied to keyboard structure, it mainly comprises: a substrate 81, one light guide plate (LGP) 8 is located at this substrate 81 top sides, one diffusing layer 83 attaches to this light guide plate (LGP) 8 top sides, should transmit the light that passes through this light guide plate (LGP) 8 with diffusion, be provided with several perforation 831 in this diffusing layer 83, one is arranged at the top side of this diffusing layer 83 by the formed keyboard matrix circuit layer 84 of light transmission material, one is arranged on this keyboard matrix circuit layer 84 by the formed rete 85 of light transmission material and shows side, and this rete 85 is provided with several bell-shaped pieces 851 in correspondence 831 positions of respectively boring a hole, one covering 86 is installed on the rete 85 shows side, and several buttons 87 are arranged on the covering 86 corresponding to each 831 position of boring a hole, and at least one light-emitting diode (LED) 82 is arranged at and faces light guide plate (LGP) 8 sides in this substrate 81.

Make the light of this light-emitting diode (LED) 82 now can be via light guide plate (LGP) 8 lateral transport, and upwards import diffusing layer 83, utilize this perforation 831 upwards to disperse for light, and, can form preferable back lighting effect in button 87 and all sides thereof at last by keyboard matrix circuit layer 84 and bell-shaped piece 851.

Yet, above-mentioned Fig. 2, it all is to utilize leaded light component with upwards guiding of light for each structure of Fig. 3, how its emphasis all is the light in the leaded light component outwards evenly diffusion and design improved in addition, but in actual applications, there are many assemblies (for example: shell in the leaded light component periphery, button) characteristic that all has light to reflect, its light that can be penetrated by this leaded light component is again in the reflected back leaded light component, and this light partly is apt to add utilization mostly at present, and let alone random diffusion, the one of the main reasons that this light illumination efficient that also forms backlight module can't further promote.

The utility model content:

Technical problem to be solved in the utility model is: at above-mentioned the deficiencies in the prior art, a kind of key light guide structure is provided, it can effectively utilize the light of all side assembly reflected back light guide plate, with the illuminating ray of lifting button position week side, and then avoids shade backlight and guarantees that brightness is even.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of key light guide structure, it has a light guide plate that is arranged at keyboard, be characterized in: described light guide plate has one at least and imports incidence surface, and the exiting surface of this light guide plate inside for light, this exiting surface and this incidence surface intersect, this exiting surface table side is defined the operating area corresponding to button, be laid with at least one scattered reflection unit in this operating area, the surface of this scattered reflection unit is provided with reflector layer.

According to said structure, wherein this scattered reflection unit is the cambered surface that protrudes from exiting surface.

According to said structure, wherein this scattered reflection unit is the cancave cambered surface that is depressed in exiting surface.

So, can effectively utilize the light of all side assembly reflected back light guide plate,, and then avoid shade backlight and guarantee that brightness is even with the illuminating ray of lifting button position week side; And can promote the light utilization ratio, promote back lighting brightness.

Liao separates in order to make above-mentioned purpose of the present utility model, effect and feature can obtain more specifically, and is as follows according to following description of drawings now:

Description of drawings:

Fig. 1 is the backing structure schematic diagram at known button position.

Fig. 2 is the backing structure schematic diagram at another known button position.

Fig. 3 is the backing structure schematic diagram at another known button position.

Fig. 4 is the structure decomposition map of the utility model first embodiment.

Fig. 5 is the combination section of the utility model first embodiment.

Fig. 6 is the light scatter schematic diagram of the utility model first embodiment.

Fig. 7 is the combination section of the utility model second embodiment.

Fig. 8 is the light scatter schematic diagram of the utility model second embodiment.

Label declaration:

1,10.... light guide plate 62.... luminescence component

11... incidence surface 71.... base plate

12... exiting surface 72.... bridge plate

13... through hole 75.... light guide section

131.. operating area 761... light source conduction space

14,104.. scattered reflection unit 76.... transmitting illuminant

15,105.. reflector layer 8..... light guide plate

20... light source body 81.... substrate

2,73.... circuit board 82.... light-emitting diode

21... conduct contact 83.... diffusing layer

3.... conductive film 831... perforation

31..... the 84.... of elasticity support sector keyboard matrix circuit layer

4,61,7,87..... button 85.... rete

5.... cap 851... bell-shaped piece

6.... leaded light component 86.... covering

Embodiment:

See also Fig. 4 to shown in Figure 6, be first embodiment of the present utility model, the structure of the utility model first embodiment comprises a light guide plate 1 as can be known, this light guide plate 1 has an incidence surface 11, and one and the exiting surface 12 that intersects of this incidence surface 11, be provided with button 4 positions of at least one through hole 13 in this light guide plate 1 corresponding to operation, this through hole 13 can be a up-narrow and down-wide bellmouth, and the through hole 13 all sides on this exiting surface 12 (corresponding to each button 4 size) define an operating area 131, in this operating area 131, evenly be laid with several scattered reflection unit 14, in the present embodiment, this scattered reflection unit 14 is for protruding from the convex surface on exiting surface 12 surfaces, convex globoidal or hemisphere, and be provided with reflector layer 15 in the surface of this scattered reflection unit 14, this reflector layer 15 can be a reflecting coating.

Above-mentioned light guide plate 1 is when practical application, can cooperate a circuit board 2 and a conductive film 3 to form the basic framework of a backlight module, this circuit board 2 is located at light guide plate 1 below, which is provided with and conduct the through hole 13 that contact 21 corresponds respectively to light guide plate 1, be provided with at least one light source body 20 in this circuit board 2 corresponding to incidence surface 11 sides of light guide plate 1 and (can be LED, cold cathode fluorescent lamp or other luminous element), conductive film 3 then is located between this circuit board 2 and the light guide plate 1, the elasticity support sector 31 that is provided with projection in this conductive film 3 is corresponding to each through hole 13 of light guide plate 1 (also simultaneously corresponding to circuit board 2 conduct contact 21), make the elasticity support sector 31 can be by make progress button 4 inconsistent combinations with light guide plate 1 opposite side (top) of each through hole 13, and in this elasticity support sector 31, accommodate one and lead contact (figure does not show), the elastic mechanism that this elasticity support sector 31 is had, allow that this button 4 produces a deflection when being subjected under the external force press operation, make this lead the contact and can contact the formation electrically conducting with the contact 21 that conducts of circuit board 2, and when the external force of this operation push-button 4 disappears, utilize the elasticity of this elasticity support sector 31 distortion to order about to lead the contact and return back to original position, simultaneously, a cap 5 can be covered on light guide plate 1 top and each button 4 position (as shown in Figure 5) in addition.

During use, the light that light source body 20 is produced imports in this light guide plate 1 via incidence surface 11, can in light guide plate 1, be guided diffusion, and most light is derived by exiting surface 12, form suitable effect backlight with printing opacity position on each button 4 all side and cap 5, other has part light meeting lateral transport to through hole 13 sides, utilizes these through hole 13 tapered inclined-planes and the guiding that light can be made progress, to promote the back lighting effect (as shown in Figure 6) of these button 4 all sides; Yet, some meeting of above-mentioned back lighting light is by cap 5 inner surfaces or button 4 lower surface reflected back light guide plate 1 surface, and because each scattered reflection unit 14 is arranged at each through hole 13 all side (being each button 4 below) respectively, and be the cambered surface or the hemisphere shape that protrude from these exiting surface 12 surfaces, the reflection action of its light-reflection layer 15 in addition, can make the light that partly reflexes to these 14 surfaces, scattered reflection unit upwards reflex to each button 4 and all sides thereof again, so, except can effectively avoiding producing the shade in button 4 and all sides thereof, also can fill a part light that utilizes light source body 2 to be produced, to promote the light utilization ratio.

Other sees also Fig. 7, Fig. 8, be second embodiment of the present utility model, the light guide plate 10 of this embodiment has the incidence surface 11 identical with the light guide plate 1 of aforementioned first embodiment, basic structures such as exiting surface 12 and through hole 13, its difference is to be: be laid with at least one scattered reflection unit 104 in the operating area 131 of light guide plate 10 each through hole 13 periphery on exiting surface 12, in present embodiment, this scattered reflection unit 104 is the pit that is depressed in exiting surface 12 surfaces, cancave cambered surface or hemispherical shrinkage pool, and be provided with reflector layer 105 in each 104 surface, scattered reflection unit, this reflector layer 105 can be a reflecting coating.

Above-mentioned light guide plate 10 can be as being arranged between conductive film 3 and each button 4 as first embodiment, and accept the light that light source body 20 is produced by incidence surface 11, after the light in the light guide plate 10 is upwards derived by exiting surface 12 (or through hole 13 inner surfaces of taper), partly light is subjected to

cap

6 or 5 stopping of inner surface of button and reflection downwards, be depressed in the pit on exiting surface 12 surfaces by above-mentioned scattered reflection unit 104, the shape of cancave cambered surface or hemispherical shrinkage pool, the reflection action that cooperates this reflector layer 105, can make the above-mentioned light that reflexes to 104 surfaces, scattered reflection unit downwards, upwards reflex to each button 4 and all sides thereof again, to reach reflection and the diffusion effect that is similar to first embodiment, the suitable loss that is enough to reduce light improves lightness backlight.

In sum, key light guide structure of the present invention really can be reached and strengthen button position brightness, the effect of avoiding shade to produce, real tool novelty and non-showing and easy intellectual, the utility model patent of in accordance with the law filing an application; Only the content of above-mentioned explanation only is preferred embodiment explanation of the present utility model, and variation, modification, change or the equivalent replacement that is extended according to technological means of the present utility model and category also all should fall in the patent claim of the present utility model such as.

Claims

1. key light guide structure, it has a light guide plate that is arranged at keyboard, it is characterized in that: described light guide plate has one at least and imports incidence surface, and the exiting surface of this light guide plate inside for light, this exiting surface and this incidence surface intersect, this exiting surface table side is defined the operating area corresponding to button, be laid with at least one scattered reflection unit in this operating area, the surface of this scattered reflection unit is provided with reflector layer.

2. key light guide structure as claimed in claim 1 is characterized in that: described scattered reflection unit is the convex surface that protrudes from this exiting surface.

3. key light guide structure as claimed in claim 2 is characterized in that: described scattered reflection unit is the convex globoidal that protrudes from this exiting surface.

4. key light guide structure as claimed in claim 2 is characterized in that: described scattered reflection unit is the hemisphere that protrudes from this exiting surface.

5. key light guide structure as claimed in claim 1 is characterized in that: described scattered reflection unit is the pit that is depressed in this exiting surface.

6. key light guide structure as claimed in claim 5 is characterized in that: described scattered reflection unit is the cancave cambered surface that is depressed in this exiting surface.

7. key light guide structure as claimed in claim 5 is characterized in that: described scattered reflection unit is the hemisphere shrinkage pool that is depressed in this exiting surface.

8. as claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described key light guide structures, it is characterized in that: described reflector layer is made by reflecting coating.

9. as claim 1 or 2 or 3 or 4 or 5 or 6 or 7 described key light guide structures, it is characterized in that: described light guide plate is provided with the through hole of at least one correspondence in button in exiting surface, and this through hole periphery side is located in this scattered reflection unit.

10. key light guide structure as claimed in claim 8 is characterized in that: described light guide plate is provided with the through hole of at least one correspondence in button in exiting surface, and this through hole periphery side is located in this scattered reflection unit.

11. key light guide structure as claimed in claim 9 is characterized in that: described through hole is up-narrow and down-wide bellmouth.

12. key light guide structure as claimed in claim 10 is characterized in that: described through hole is up-narrow and down-wide bellmouth.