CN103672739A - Keyboard light guide film and manufacturing method thereof - Google Patents
Keyboard light guide film and manufacturing method thereof Download PDFInfo
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- CN103672739A CN103672739A CN201210337019.6A CN201210337019A CN103672739A CN 103672739 A CN103672739 A CN 103672739A CN 201210337019 A CN201210337019 A CN 201210337019A CN 103672739 A CN103672739 A CN 103672739A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 230000008676 import Effects 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000012780 transparent material Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Abstract
The invention aims to provide a keyboard light guide film and a manufacturing method thereof. Even if a thick reflection board is not used or double-sided adhesives enabling the reflection board to adhere to a light leading-in portion are not used, the distance between the light leading-in portion and a light source can be shortened to the maximum, shape deformation or movement of the light leading-in portion can be avoided and the light leading-in efficiency of the light leading-in portion can be further improved. According to the light guide film, a bent shape portion is formed on the light leading-in portion, and therefore the distance between the light source and the light leading-in portion is shortened; the inner portion of the bent shape portion is filled with shape maintaining bodies, and therefore the shape of the bent shape portion is maintained firmly. In addition, the light guide film is manufactured through a manufacturing procedure of a light guide raw sheet, a cutting procedure of the light guide raw sheet and a separating procedure of the light guide raw sheet.
Description
Technical field
The present invention relates to light guiding film and manufacture method thereof for keyboard, relate in more detail for the mobile terminals such as mobile phone or electronic instrument, the light irradiating from internal light source is directed to the word or figure of button portion, to improve the word of button portion setting or the keyboard light guiding film of figure brightness.
Background technology
In general, for devices such as the mobile terminals such as mobile phone or electronic instruments, in button portion, possessed button or the Fumction display portion (following, referred to as display part) that carries out switching manipulation.The bottom of button portion stacks gradually keyboard and the tellite that carries switching device.
In addition, the display part of button portion designs with multiple grain patterns such as numeral, word, figures, and the light source that LED etc. is set on tellite illuminates this display part.Between button portion and keyboard, be also provided with light guiding film, the display part by the light guiding of light source transmitting to button portion.
Fig. 1 is as the front view that represents general mobile phone, and as shown in the figure, the front of mobile phone 1 possesses and has display part 2 and button portion 3, and button portion possesses and has function key or for the display part 3a of Fumction display.
The cutaway view that Fig. 2 cuts open along A-A line as Fig. 1, means keyboard in the past by the formation of light guiding film 4 and structure is set.That is, light guiding film 4 is in the past arranged between button portion 3 and keyboard 5.The light of light guiding film 4 disperse the 4a of portion be arranged at button portion 3 display part 3a under, light introduction part 4b is positioned at the slot part 6a that is provided with light source 6.Therefore, the light irradiating from light source 6 can draw direct light by the light introduction part 4b of light guiding film 4 and disperse the 4a of portion, and disperses to display part 3a mono-side of button portion 3, illuminates thus display part 3a.
In addition the display part 3a reverse side that, light is dispersed the 4a of portion is attached with the zone of reflections 7.The zone of reflections 7 to display part 3a side, can be dispersed more light by the light reflection of coming from light introduction part 4b guiding thus.Reflecting plate 8 is attached to light source 6 reverse side of light introduction part 4b by two-sided tape 9.Reflecting plate 8 is dispersed the 4a of portion by irradiating the light reflection of coming from light source 6 to light, guides thus more light.
Due to the separately setting position of regulation of light guiding film 4 with light source 6, the certain distance of being separated by between the position of light introduction part 4b and the position of light source.Therefore, in order to improve light in light introduction part 4b, import efficiency, need to make as much as possible distance maintaining between light lead-in portion 4b and light source 6 recently.For this reason, be all on the light source reverse side of light introduction part 4b, to adhere at least thicker reflecting plate 8 of two superimposed, the spacing having furthered between light introduction part 4b and light source 6 with this in the past.
But, although formed adhesive linkage in the one side of the zone of reflections 7 of thinner thickness, on the thicker reflecting plate 8 of thickness, but do not form adhesive linkage.Thus, reflecting plate 8 utilizes two-sided tape 9 to be attached on light introduction part 4b.Adhering to of such reflecting plate 8 need to be carried out one by one by hand by staff.Therefore, can there is the elongated shortcoming of the very loaded down with trivial details activity time causing of flow chart.In addition, due to than the zone of reflections 7, reflecting plate 8 belongs to expensive expensive material.Therefore, not only can because of reflecting plate 8 adhere to operation cause workability and productivity low, also can cause due to the raising of labour cost and fee of material occurring the problem that manufacturing cost rises.
In addition, light guiding film 4 is in the past, supported the structure of light introduction part 4b by the overlapping reflecting plate adhering to 8 in two sides, therefore, cause light introduction part 4b that structure is set is firm not.Therefore, can exist light introduction part 4b in slot part 6a, to occur model deformation or the misgivings of moving about, thus, may cause the light of light introduction part 4b to import Efficiency Decreasing.In addition,, because, the double faced adhesive tape 9 that is used for adhering to reflecting plate 8 carries between reflecting plate 8 and light introduction part 4b, therefore, there will be the reflection efficiency of reflecting plate 8 to decline, and then cause the problem of the brightness reduction in display part 3a.
Summary of the invention
(technical problem that will solve)
In order to solve problem in the past as above, the object of the present invention is to provide light guiding film and manufacture method thereof for keyboard, even if do not use thicker reflecting plate, or do not use in order to make this reflecting plate be attached to the double faced adhesive tape of light introduction part, the distance that also can further to greatest extent between light introduction part and light source, thereby by the thrifty and manufacturing process of fee of material of high price, shorten and improve workability and productivity is nature, can also reduce manufacturing cost.
In addition, another object of the present invention is to provide light guiding film and manufacture method thereof for keyboard, when can prevent moving about after the model deformation of light introduction part and assembling, can increase light in light introduction part and import efficiency, thus the brightness that further improves display part.
(means of dealing with problems)
In order to reach object as above, according to keyboard light guiding film of the present invention, this light guiding film comprises the light introduction part that the light of the display part below that is positioned at button portion is dispersed portion and is positioned at light source top, light light source being irradiated by light introduction part draws direct light and disperses portion, and disperse to display part one side, it is characterized in that, in described smooth introduction part, be formed with curved shape portion, curved shape portion has towards the opposition side of light source open, and the side of protruding towards light source side.
In addition, keyboard light guiding film according to the present invention is in the curved shape portion of described smooth introduction part, to fill the first shape maintains body to form feature.
In addition, keyboard light guiding film according to the present invention is connected in the part of a side that light is dispersed the curved shape portion of portion's one side described in being, have the light forming to light source incline and import inclined plane, described light imports the light source side terminal part on inclined plane, and the place ahead that is positioned at light source is feature.
In addition, according to keyboard light guiding film of the present invention, be that described light imports inclined plane, to curved shape portion inner side, with circular shape, be bent to form, and import and in inclined plane, fill the second shape maintains body and form feature to the light of described bending.
In addition, according to of the present invention, possesses the manufacture method of light guiding film for keyboard that light disperses portion and light introduction part, it is characterized in that, comprise following operation: settle a plurality ofly to comprise that described light disperses the light guiding film raw sheet that injection mo(u)lding is carried out in the light guiding film region of portion and light introduction part, in the light introduction part in described each light guiding film region, form a side open, and the curved shape portion with the side of protruding to a side, the manufacturing process of injecting the light guiding film raw sheet of the first shape maintains body moulding with inserted mode system method in described curved shape portion; In order to cut each light guiding film region from described light guiding film raw sheet, form the cutting process of intercepting line; Along described intercepting line, the separation circuit by light guiding film region from the separation of light guiding film raw sheet.
In addition, the manufacture method of light guiding film for keyboard according to the present invention, it is characterized in that, in the manufacturing process of described light guiding film raw sheet, a part in the side of curved shape portion, the light forming with circular shape bending towards curved shape portion inner side imports inclined plane, and the light of described bending imports in inclined plane, injects the second shape maintains body carry out moulding with inserted mode system method.
(effect of invention)
According to thering is the light guiding film of the present invention that as above feature forms, in light introduction part, form curved shape portion, towards light source side, to protrude, a side of curved shape portion forms towards the light of light source side and imports inclined plane, thus, can improve the brightness of display part.In addition, by maintaining body in curved shape portion and light importing inclined plane filling shape, can maintain securely the integrally bending form of light introduction part, thus, can in the slot part that light introduction part is set, prevent the model deformation of light introduction part or move about.
In addition, the present invention is owing to forming the operation of curved shape portion in light introduction part and form the operation of shape maintains body in curved shape portion, when the former plate injection moulding of light guiding film for manufacture light guiding film, complete together, therefore, than the dual overlapping and operation of adhering to of the independent reflecting plate by thick of implementing in the past, significantly simplify manufacturing process, can improve assembleability and productivity thus, in addition, owing to not using the reflecting plate of high price, therefore there is the effect that significantly reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 means the front view of general mobile phone.
The cutaway view that Fig. 2 cuts open along A-A line as Fig. 1, means the cutaway view of the state that arranges of light guiding film for keyboard in the past.
Fig. 3 means the cutaway view with the state that arranges of light guiding film according to the keyboard of one embodiment of the invention.
Fig. 4 a means the front view by light guiding film according to keyboard according to the present invention of seeing at the reverse side of light source.
Fig. 4 b means the front view by light guiding film according to keyboard according to the present invention of seeing in light source side.
Fig. 5 means the oblique view of the light introduction part of light guiding film for keyboard according to the present invention
Fig. 6 mean on the surface of light source, see according to the front view of the variation of light guiding film of the present invention.
Fig. 7 a means the manufacturing process of light guiding film for keyboard according to the present invention, means the plane that forms the operation of bend in light introduction part.
Fig. 7 b means the cutaway view that Fig. 7 a cuts open along B-B line.
Fig. 8 a means the manufacturing process by light guiding film according to keyboard according to the present invention, means that bend filling shape in light introduction part maintains the plane of body formed operation.
Fig. 8 b means the cutaway view that Fig. 8 a cuts open along C-C line.
Fig. 9 a and Fig. 9 b mean the manufacturing process by light guiding film according to keyboard according to the present invention, mean at light guiding film raw sheet and form, form light guiding film region intercepting line operation with, along the operation of the separated light guiding film of intercepting line.
(description of reference numerals)
11: the 11a of button portion: display part
13: light source 20: light guiding film
21: light is dispersed portion 22: light introduction part
23: 24: the first shape maintains bodies of curved shape portion
25: light imports 26: the second shape maintains bodies in inclined plane
25A: light guiding film region S: light guiding film raw sheet
CL: intercepting line
The specific embodiment
Below, with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Fig. 3 to Fig. 5 means the state that arranges and the main composition of light guiding film for keyboard according to the present invention, as shown in Figure 3, light guiding film 20 of the present invention is arranged at, in the mobile terminals such as mobile phone or electronic instrument for various functions and switching manipulation and between the button portion 11 and keyboard 12 that possess.
Light guiding film 20 is by, the light that is positioned at the display part 11a below of button portion 11, to disperse portion 21 to form with the light introduction part 22 that is arranged on tellite 14 and be positioned at light source top.Light guiding film 20 is by as PC(Merlon) or PET(PET) resin the injection mo(u)lding of light diffusion material and manufacture.
Light guiding film 20 is as constructed as above, and the light that light source 13 is irradiated draws direct light by light introduction part 22 and disperses portion 21, and disperses to display part 11a mono-side, carries out thus the function that illuminates display part 11a.
In light guiding film 20 of the present invention, light introduction part 22 possesses curved shape portion 23, makes light introduction part 22 close to light source 13.Curved shape portion 23 is the opposition sides from light source 13, towards light source 13 sides, protrudes and forms, thus the opposition side of open light source 13, enclosed light source 13 sides, and by side-prominent cubic side, source 13 to light, can make light introduction part 22 close to light source 13.
Now, in the curved shape portion 23 of described smooth introduction part 22, be to fill the first shape maintains body 24 to form, can maintain securely thus the form of curved shape portion 23.The material of the first shape maintains body 24 is to use transparent silicon or acrylic resin, and the light increasing thus in light introduction part 22 imports efficiency.
In addition, in smooth introduction part 22 of the present invention, be connected in the part of a side that light is dispersed the curved shape portion 34 of portion's 32 1 sides, there is the light being formed slopely towards light source 13 and import inclined plane 25.The place ahead that the light source 13 side terminal part 25a on light importing inclined plane 25 are positioned at light source 13 forms, and makes thus light effectively import.
In addition, light imports inclined plane 25, and the inner side towards curved shape portion 23, is bent to form with circular shape.At crooked light, importing the interior filling in inclined plane 25 forms with the second shape maintains body 26 of the first shape maintains body 24 identical materials, can, together with the first shape maintains body 24, in both sides, maintain securely when light imports inclined plane 25 and can increase light importing efficiency thus.
Now, be filled with the side of described curved shape portion 23 and the side that light imports the second shape maintains body 26 of inclined plane 25 interior formation, form with the two side walls opposite of the slot part 13a at light source 13 places, thus, make light introduction part 22 be positioned at the state that sandwiches slot part 13a, thereby do not occur easily moving about.
On the other hand, the light of light guiding film 20 is dispersed portion 21 and is formed the drafting department 21a to display part 11a by light reflection at the reverse side of display part 11a.Drafting department 21a is formed by the concavo-convex of multiple apperance, thereby makes effectively towards display part 11a side, to reflect from the light of light introduction part 22 guiding.
In addition, the opposition side attachment that light is dispersed the display part 11a of portion 21 has the zone of reflections 15, thus by light reflection to display part 11a side.Although not shown, preferably light source 13 reverse side in light introduction part 22 also adhere to the zone of reflections, thereby light reflection is dispersed to portion's 21 sides to light.
Fig. 6 mean on the surface of light source, see according to the front view of the variation of light guiding film of the present invention.In this variation, according to light, disperse the position of the drafting department 21a forming in portion 21, change angle θ, makes the light of the curved shape portion 23 of formation in light introduction part 22 import rake 25 towards drafting department 21a.
As mentioned above, possessing light, to disperse portion 21 as follows with the manufacture method of the light guiding film of the present invention 20 of light introduction part 22.
First, as shown in Fig. 7 a and Fig. 7 b, make to comprise that light disperses many of the light guiding film 20A of portion 21 and light introduction part 22 and be configured to light guiding film raw sheet S that row form and manufactured by PC or the injection mo(u)lding of PET material.Now, the light of described each light guiding film region 20A is dispersed in portion 21 and is formed drafting department 21a, forms curved shape portion 23 in light introduction part 22.This is when the mould of manufacturing for injection mo(u)lding, on mould, form in order to form the structure of drafting department 21a and curved shape portion 23, and utilize this mold injection molding, thereby when manufacturing light guiding film raw sheet S, can form drafting department 21a and curved shape portion 23.
The side of in addition, dispersing portion's 21 sides at the light of described curved shape portion 23 forms light and imports inclined plane 25.It is when light guiding film 20 is set that light imports inclined plane 25, and the terminal part 25a that makes light import inclined plane 25 is formed obliquely in the anterior position of light source 13 with circular shape.Thus, when light guiding film 20 is set, the terminal part 25a that light imports inclined plane 25 is positioned at the dead ahead of light source 13, thereby the light that light source 13 irradiates is imported more effectively.
In addition,, as shown in Fig. 8 a and Fig. 8 b, in described curved shape portion 23 and light importing inclined plane 25, with inserted mode system method, inject first and second shape maintains body 24,26 and carry out moulding.Inserted mode system method is as in an injection mold, the technology that the material of xenogenesis is combined into one, in order to manufacture in an injection mold of light guiding film raw sheet S, injecting in order to form the material of first and second shape maintains body 24,26, can pass through single injection-molded, the state that first and second shape maintains body 24,26 is combined into one on light guiding film raw sheet S carrys out moulding.
As mentioned above, first and second shape maintains body 24,26 is combined into one on light guiding film raw sheet S by inserted mode system method, can not use thus independently adhesive just can fix first and second shape maintains body 24,26, thereby manufacturing process is simplified, and firmly support the form of curved shape portion 23, and then prevent that itself from occurring distortion.
The material of shape maintains body 24 is preferably and is different from light guiding film raw sheet S material, as silicon or acrylic resin, and can consist of transparent material, thereby can improve light, imports efficiency.
Afterwards, as shown in Fig. 9 a, in order to cut each light guiding film region 20A from described light guiding film raw sheet S, carry out the cutting process that forms intercepting line CL, as shown in Fig. 9 b, for the light guiding film region 20A from the separated intercepting of light guiding film raw sheet S, carry out separation circuit, manufacture thus light guiding film 20.
What the effect of the light guiding film 20 that the manufacture method by such is formed was carried out is described as follows.As shown in Figure 3, the light irradiating from light source 13 can be by the curved shape portion 23 direct light introduction parts 22 close to light source 13.Now, curved shape portion 23 is due to when manufacturing injection mold for light guiding film 20 injection mo(u)ldings, can freely design it and protrude length, therefore can make curved shape portion 23 to greatest extent close to light source 13, the terminal part 25a that makes light import inclined plane 25 is positioned at the dead ahead of light source 13, improves thus light and imports efficiency.
In addition, first and second shape maintains body 24, 26, due to can be when the injection mo(u)lding of light guiding film 20, one-body molded by inserted mode system method, so first and second shape maintains body 24, 26 can import combination securely in inclined plane at curved shape portion 23 and the light of light introduction part 22, thereby prevent the model deformation of light introduction part 22 and move about, and when assemble the two side that the lateral surface of the side of curved shape portion 23 and the second shape maintains body 26 is clipped in the slot part 13a at light source 13 places, owing to making light introduction part 22 not occur easily moving about in slot part 13a, therefore can maintain certain distance with light source 13 always.
In addition, insert first and second shape maintains body the 24, the 26th of curved shape portion 23 interior formation, transparent material, consist of, therefore than translucent or transparent materials, the light that can improve in light introduction part 22 imports efficiency.
Afterwards, from light introduction part 22, draw the light that direct light disperses portion 21 and can diffuse to the display part 11a that button portion 11 possesses, illuminate thus display part 11a, light is dispersed portion 21 zone of reflections 15 by being attached to light reflects to display part 11a, carrys out thus further to improve brightness.
Now, be formed at the drafting department 21a of reverse side that light is dispersed the display part 11a of portion 21, can carry out light refraction to display part 11a side, carry out thus further to improve the function of display part 11a brightness.
Embodiment described above is only the explanation that the preferred embodiments of the present invention are carried out, claim scope of the present invention is not limited to the embodiment of explanation, general technical staff of the technical field of the invention is to be understood that, can within the scope of technological thought of the present invention and claim, realize numerous variations, distortion or replacement, therefore, such embodiment should belong to scope of the present invention.
Claims (6)
1. a keyboard light guiding film, this light guiding film comprises the light introduction part that the light of the display part below that is positioned at button portion is dispersed portion and is positioned at light source top, and light light source being irradiated by light introduction part draws direct light and disperses portion, and disperses to display part one side, it is characterized in that
The opposition side that is formed with light source in described smooth introduction part is open, and has the curved shape portion that surveys outstanding side towards light source.
2. keyboard light guiding film according to claim 1, is characterized in that,
In the curved shape portion of described smooth introduction part, be to fill the first shape maintains body and form.
3. keyboard light guiding film according to claim 1 and 2, is characterized in that,
Describedly be connected in light to disperse the part of a side for the curved shape portion of portion's one side be imported inclined plane and formed by the light forming towards light source incline, described light imports the light source side terminal part on inclined plane, is positioned at the place ahead of light source.
4. keyboard light guiding film according to claim 3, is characterized in that,
It is towards curved shape portion inner side that described light imports inclined plane, with circular shape, is bent to form, and it is to fill the second shape maintains body and form that the light of described bending imports in inclined plane.
5. possess light and disperse a manufacture method for light guiding film for the keyboard of portion and light introduction part, it is characterized in that, comprising:
Configure and a plurality ofly comprise that described light disperses the light guiding film raw sheet that injection mo(u)lding is carried out in the light guiding film region of portion and light introduction part, in the light introduction part in described each light guiding film region, form a side open and there is the curved shape portion of the side of protruding to a side, to the manufacturing process of injecting the light guiding film raw sheet of the first shape maintains body moulding with inserted mode system method in described curved shape portion;
In order to cut each light guiding film region from described light guiding film raw sheet, form the cutting process of intercepting line;
Along described intercepting line, the separation circuit by light guiding film region from the separation of light guiding film raw sheet.
6. the manufacture method of light guiding film for keyboard according to claim 5, is characterized in that,
In the manufacturing process of described light guiding film raw sheet, a part in the side of curved shape portion, the light forming with circular shape bending towards curved shape portion inner side imports inclined plane, and the light of described bending imports in inclined plane, injects the second shape maintains body carry out moulding with inserted mode system method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210337019.6A CN103672739A (en) | 2012-09-12 | 2012-09-12 | Keyboard light guide film and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210337019.6A CN103672739A (en) | 2012-09-12 | 2012-09-12 | Keyboard light guide film and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103672739A true CN103672739A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210337019.6A Pending CN103672739A (en) | 2012-09-12 | 2012-09-12 | Keyboard light guide film and manufacturing method thereof |
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| CN (1) | CN103672739A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108335935A (en) * | 2018-03-29 | 2018-07-27 | 联想(北京)有限公司 | Back lighting device, keyboard and electronic equipment |
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|---|---|---|---|---|
| KR100651417B1 (en) * | 2005-07-15 | 2006-11-29 | 삼성전자주식회사 | Keypad lighting device for portable terminals |
| JP2010218996A (en) * | 2009-03-19 | 2010-09-30 | Alps Electric Co Ltd | Keyboard device having illumination function |
| US20100259485A1 (en) * | 2009-04-08 | 2010-10-14 | Cheng-Yen Chuang | Touch keyboard input device enabling pattern switching |
| CN102537850A (en) * | 2011-12-16 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Light guide equipment and mobile phone |
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2012
- 2012-09-12 CN CN201210337019.6A patent/CN103672739A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100651417B1 (en) * | 2005-07-15 | 2006-11-29 | 삼성전자주식회사 | Keypad lighting device for portable terminals |
| JP2010218996A (en) * | 2009-03-19 | 2010-09-30 | Alps Electric Co Ltd | Keyboard device having illumination function |
| US20100259485A1 (en) * | 2009-04-08 | 2010-10-14 | Cheng-Yen Chuang | Touch keyboard input device enabling pattern switching |
| CN102537850A (en) * | 2011-12-16 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Light guide equipment and mobile phone |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108335935A (en) * | 2018-03-29 | 2018-07-27 | 联想(北京)有限公司 | Back lighting device, keyboard and electronic equipment |
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Application publication date: 20140326 |