CN109036928B - Backlight device for use in luminous keyboard - Google Patents
Backlight device for use in luminous keyboard Download PDFInfo
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- CN109036928B CN109036928B CN201810918624.XA CN201810918624A CN109036928B CN 109036928 B CN109036928 B CN 109036928B CN 201810918624 A CN201810918624 A CN 201810918624A CN 109036928 B CN109036928 B CN 109036928B
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- light
- protruding
- guide plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
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Abstract
The invention discloses a backlight device used in a luminous key. The luminous keyboard comprises a plurality of keys. The backlight device comprises a light guide plate, a light source, a light shielding sheet and a light reflecting sheet. The shading sheet comprises a covering part and a plurality of first protruding parts. The reflector comprises a central part and a plurality of second protruding parts. The covering part of the shading sheet is attached to the front surface of the light guide plate. The central part of the reflecting sheet is attached to the back surface of the light guide plate. Each first protruding part is arranged between two adjacent second protruding parts and bent to be attached to the outer edge side face of the light guide plate and the central part of the light reflecting sheet. Each second protruding portion is arranged between two adjacent first protruding portions and bent to be attached to the outer edge side face of the light guide plate and the covering portion of the light shielding sheet. The invention can avoid light leakage and effectively recycle the light which is not utilized.
Description
Technical Field
The present invention relates to a backlight device for use in a light-emitting keyboard, and more particularly, to a backlight device which avoids light leakage and effectively recovers unused light.
Background
An illuminated keyboard is a common input peripheral device on the market. Some of the prior art backlight devices for illuminating keyboards have light sources (typically leds) arranged along the short side or the long side of the light guide plate. In other prior art, the light guide plate has an opening, and the light source is disposed in the opening of the light guide plate. Light emitted by the light source is emitted into the light guide plate from the short side edge, the long side edge or the inner side wall of the opening, and the light is guided by the light guide plate to be emitted from a light emitting area defined on the front surface of the light guide plate.
Referring to fig. 1, fig. 1 is a partial cross-sectional view of a backlight device 1 of the prior art. The backlight device 1 of the prior art includes a light guide plate 10, a light shielding sheet 12 and a light reflecting sheet 14. The light guide plate 10 has a front surface 102 and a back surface 104. The backlight device 1 of the prior art further comprises a light source (not shown in fig. 1). The light source is used for emitting light. The light source is disposed such that light is incident into the light guide plate 10. The light entering the light guide plate 10 is guided by the light guide plate 10 to the front surface 102 of the light guide plate 10, and then exits from a plurality of light exiting regions (not shown in fig. 1) on the front surface 102 of the light guide plate 10.
The light shielding sheet 12 includes a covering portion 122 and a first covering portion 124. The cover portion 122 of the light shielding sheet 12 has a plurality of light-transmitting portions (not shown in fig. 1). The first covering portion 124 of the shade 12 extends outwardly at the edge of the covering portion 122. Each of the light-transmitting portions of the covering portion 122 corresponds to a light-exiting region of one light guide plate 10. The covering portion 122 of the light shielding sheet 12 is attached to the front surface 102 of the light guide plate 10, so that each light-transmitting portion is aligned with its corresponding light-emitting area, and the first covering portion 124 of the light shielding sheet 12 is also suspended outside the edge of the light guide plate 10. The retroreflective sheeting 14 includes a central portion 142 and a second cover portion 144. The second coating portion 144 of the reflector 14 extends outwardly at the edge of the central portion 142. The central portion 142 of the reflector 14 is attached to the back surface 104 of the light guide plate 10, so that the second coating portion 144 of the reflector 14 is also suspended outside the edge of the light guide plate 10. The first cladding portion 124 of the light-shielding sheet 12 is attached to the second cladding portion 144 of the reflector 14. Here, the edge of the light guide plate 10 refers to an outermost edge of the light guide plate 10 or an edge of a through hole formed in the light guide plate 10.
In fact, the prior art backlight 1 has tolerances in assembly. It is likely that the edges of the first cover 124 of the light-shielding sheet 12 and the second cover 144 of the retroreflective sheet 14 do not fit together, as shown in fig. 1. The hardened adhesive 16 is exposed on the exposed first coating portion 124 or the exposed second coating portion 144, for example, in fig. 1, the hardened adhesive 16 is exposed on the exposed second coating portion 144. Causing the hardened glue 16 to act as a conduit for the escape of unused light (the arrows marked in fig. 1 represent unused light).
Obviously, the backlight device of the prior art still has room for improvement in the design of avoiding light leakage and effectively recycling the unused light.
Disclosure of Invention
Therefore, the present invention is directed to a backlight device for a light-emitting keyboard. The backlight device can avoid light leakage and effectively recycle unused light.
In order to solve the above problems, the present invention provides a backlight device for use in a light-emitting keyboard, the light-emitting keyboard comprising a plurality of keys, the backlight device comprising: light guide plate, light source, anti-dazzling screen and reflector panel. The light guide plate is provided with a front surface, a back surface and an outer edge side surface, wherein a plurality of light emergent areas are defined on the front surface, and each light emergent area corresponds to one key; the light source is used for emitting light rays, the light source is arranged to enable the light rays to be emitted into the light guide plate, the light rays are guided to the front face by the light guide plate, and then the light rays are emitted from the light emitting areas on the front face; the shading sheet comprises a covering part and a plurality of first protruding parts, wherein the covering part is provided with a plurality of light-transmitting parts, the plurality of first protruding parts extend outwards at a first preset position of a first edge of the covering part and are mutually spaced at a first interval, each light-transmitting part corresponds to one light-emitting area, and the covering part is attached to the front surface of the light guide plate to enable each light-transmitting part to be aligned with the corresponding light-emitting area; the light reflecting sheet comprises a central part and a plurality of second protruding parts, the second protruding parts extend outwards at a second preset position of a second edge of the central part and are spaced at intervals of a second interval, the second preset position corresponds to the first preset position, and the central part is attached to the back surface of the light guide plate; the first width of each first protruding portion is equal to the second interval, the second width of each second protruding portion is equal to the first interval, each first protruding portion is arranged between two adjacent second protruding portions and bent to be attached to the outer edge side face and the central portion, and each second protruding portion is arranged between two adjacent first protruding portions and bent to be attached to the outer edge side face and the covering portion.
As an optional technical solution, the first predetermined position is located between two adjacent light-transmitting portions near the first edge of the cover portion.
As an optional technical solution, the light-shielding sheet further includes a first covering portion extending outward from the first edge of the covering portion except the first predetermined position, the light-reflecting sheet further includes a second covering portion extending outward from the second edge of the central portion except the second predetermined position, and the first covering portion and the second covering portion are attached together.
As an optional technical solution, the light guide plate further has a first through hole, the cover portion has a second through hole thereon, the central portion has a third through hole thereon, the second through hole and the third through hole both correspond to the first through hole, the light shielding sheet further includes a third cladding portion surrounding the second through hole and a plurality of third protruding portions extending inward at the third cladding portion and spaced apart from each other by a third distance, the light reflecting sheet further includes a fourth cladding portion surrounding the third through hole and a plurality of fourth protruding portions extending inward at the fourth cladding portion and spaced apart from each other by a fourth distance, a third width of each third protruding portion is equal to the fourth distance, a fourth width of each fourth protruding portion is equal to the third distance, the third cladding portion and the fourth cladding portion are disposed in the first through hole and attached together, each third protruding part is arranged between two adjacent fourth protruding parts and is bent to be attached to the fourth coating part, and each fourth protruding part is arranged between two adjacent third protruding parts and is bent to be attached to the third coating part.
As an optional technical solution, the backlight device further includes a plurality of light-turning structures formed on the back surface and located below the light-emitting areas, for guiding the light rays emitted to the light-turning structures to the front surface, and then emitting the light rays from the light-emitting areas on the front surface.
In addition, the present invention further provides a backlight device for use in a light-emitting keyboard, the light-emitting keyboard comprising a plurality of keys, the backlight device comprising: light guide plate, light source, anti-dazzling screen and reflector panel. The light guide plate is provided with a front surface, a back surface and a first through hole, wherein a plurality of light emergent areas are defined on the front surface, and each light emergent area corresponds to one key; the light source is used for emitting light rays, the light source is arranged to enable the light rays to be emitted into the light guide plate, the light rays are guided to the front face by the light guide plate, and then the light rays are emitted from the light emitting areas on the front face; the shading sheet comprises a covering part, a first coating part and a plurality of first protruding parts, wherein the covering part is provided with a plurality of light transmission parts and second through holes, each light transmission part corresponds to one light emergent area, each second through hole corresponds to one first through hole, the shading sheet also comprises a first coating part and a plurality of first protruding parts, the first coating parts extend inwards at the first coating part and are spaced at intervals with a first interval, and the covering part is attached to the front surface to enable each light transmission part to be aligned with the corresponding light emergent area; the light reflecting sheet comprises a central part, a second coating part and a plurality of second protruding parts, wherein the central part is provided with a third through hole, the third through hole corresponds to the first through hole, the second coating part surrounds the third through hole, the plurality of second protruding parts extend inwards at the second coating part and are spaced at a second interval, and the central part is attached to the back surface; the first width of each first protruding portion is equal to the second interval, the second width of each second protruding portion is equal to the first interval, the first coating portion and the second coating portion are arranged in the first through hole and are attached together, each first protruding portion is arranged between two adjacent second protruding portions and is bent to be attached to the second coating portion, and each second protruding portion is arranged between two adjacent first protruding portions and is bent to be attached to the first coating portion.
As an optional technical solution, the light guide plate further has an outer edge side surface, the light shielding sheet further includes a plurality of third protrusions, the plurality of third protrusions extend outwards at a first predetermined position of the first edge of the covering portion and are spaced apart from each other at a third interval, the reflector further comprises a plurality of fourth protrusions extending outwardly at a second predetermined location on the second edge of the central portion and spaced apart from each other at a fourth spacing, the second preset position corresponds to the first preset position, the third width of each third protruding portion is equal to the fourth interval, the fourth width of each fourth protruding portion is equal to the third interval, each third protruding portion is arranged between two adjacent fourth protruding portions and is bent to be attached to the outer edge side face and the central portion, and each fourth protruding portion is arranged between two adjacent third protruding portions and is bent to be attached to the outer edge side face and the covering portion.
As an optional technical solution, the first predetermined position is located between two adjacent light-transmitting portions near the first edge of the cover portion.
As an optional technical solution, the light-shielding sheet further includes a third covering portion extending outward from the first edge of the covering portion except the first predetermined position, the light-reflecting sheet further includes a fourth covering portion extending outward from the second edge of the central portion except the second predetermined position, and the third covering portion and the fourth covering portion are attached together.
As an optional technical solution, the backlight device further includes a plurality of light-turning structures formed on the back surface and located below the light-emitting areas, for guiding the light rays emitted to the light-turning structures to the front surface, and then emitting the light rays from the light-emitting areas on the front surface.
Different from the prior art, the backlight device can avoid light leakage and effectively recycle the unused light.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a partial sectional view of a related art backlight device.
FIG. 2 is an expanded view of the components of a light-emitting keyboard employing a backlight device according to a preferred embodiment of the present invention.
Fig. 3 is a partially enlarged view of the backlight device of fig. 2 assembled and corresponding to a first predetermined position of the light shielding sheet and a second predetermined position of the light reflecting sheet.
Fig. 4 is a partial sectional view of the backlight device of fig. 2 assembled and corresponding to the first through hole of the light guide plate, the second through hole of the light-shielding sheet, and the third through hole of the light-reflecting sheet.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "side", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
In the following embodiments, the same portions are denoted by the same reference numerals in different drawings.
Please refer to fig. 2, fig. 3 and fig. 4. Fig. 2 schematically shows a light-emitting keyboard 2 employing a backlight device 3 according to a preferred embodiment of the present invention in an exploded view. Fig. 3 is a partially enlarged view of the backlight device 3 of fig. 2 assembled and corresponding to the first predetermined position 3406 of the light shielding sheet 34 and the second predetermined position 3604 of the light reflecting sheet 36. Fig. 4 is a partial sectional view of the backlight device 3 of fig. 2 assembled and corresponding to the first through hole 308 of the light guide plate, the second through hole 3408 of the light shield 34, and the third through hole 3606 of the light reflector 36.
As shown in fig. 2, light-emitting keyboard 2 using backlight device 3 of the present invention includes substrate 22, backlight device 3 of the present invention, and keyboard section 20. The backlight device 3 is provided on the substrate 22, and the keyboard portion 20 is provided on the backlight device 3. The keyboard section 20 includes a plurality of keys 202.
The backlight device 3 according to the preferred embodiment of the present invention comprises a light guide plate 30, a light source 32, a light shielding sheet 34 and a light reflecting sheet 36.
The light guide plate 30 has a front surface 300, a back surface 302, and a peripheral side surface 304. The front surface 300 of the light guide plate 30 defines a plurality of light exiting regions 306. Each light exiting zone 306 corresponds to a key 202. It should be noted that the light-exiting regions 306 are not solid structures, but rather predetermined regions.
In one embodiment, the light guide plate 30 may be made of acryl, silicone, Thermoplastic Polyurethane (TPU), or other commercial polymer material with good optical conductivity.
The light source 32 is used for emitting light. The light source 32 is disposed such that light is incident into the light guide plate 30. For example, in the example shown in fig. 2, the light guide plate 30 further has a plurality of openings 303. The plurality of openings 303 are formed on the rear surface 302 of the light guide plate 30 and are close to the outer edge side surface 301 of the long side of the light guide plate 30. In fig. 1, the plurality of openings 303 are close to the long side 301 of the light guide plate 30, but the invention is not limited thereto. Each opening 303 has a respective light incident surface. The light source 32 includes a circuit board 322 and a plurality of light emitting elements 324. A plurality of light emitting assemblies 324 are electrically connected to the circuit board 322. One opening 303 for each light emitting assembly 324. The light source 32 is disposed on the back surface 302 of the light guide plate 30 such that each light emitting element 324 is disposed in its corresponding opening 303. In fig. 2, the reflector 36 has an opening 3608 therethrough, and the light source 32 is disposed within the opening 3608. The light emitted from each light emitting element 324 enters the light guide plate 30 through the light incident surface of the corresponding opening 303, and is guided in the light guide plate 30. The light source 32 may be disposed adjacent to the outer edge side 304 of the short side of the light guide plate 30 or adjacent to the outer edge side 301 of the long side of the light guide plate 30.
In an embodiment, the circuit board 322 may be a flexible circuit board, but the invention is not limited thereto.
In one embodiment, each of the light emitting devices 324 may be a semiconductor light emitting diode or an organic light emitting diode, but the invention is not limited thereto.
The light entering the light guide plate 30 is guided by the light guide plate 30 to the front surface 300 of the light guide plate 30, and then exits from the light exiting regions 306 on the front surface 300 of the light guide plate 30.
Further, the backlight device 3 according to the preferred embodiment of the present invention further comprises a plurality of light-turning structures 38. The light-turning structures 38 are formed on the back surface 302 of the light guide plate 30, and the light-turning structures 38 are located below the light-emitting areas 306, so as to guide the light emitted to the light-turning structures 38 to the front surface 300 of the light guide plate 30, and then emit the light from the light-emitting areas 306 on the front surface 300 of the light guide plate 30.
In one embodiment, the light diverting structures 38 may be formed by printing a dot of light (e.g., white) ink on the back surface 302 of the light guide plate 30, or may be micro-structures (micro-lenses), or may be integrally formed with the light guide plate 30 by plating. However, the formation of the plurality of light redirecting structures 38 is not limited to the above-described process.
As shown in fig. 2 and 3, the light shielding sheet 34 includes a covering portion 340 and a plurality of first protruding portions 341. The cover portion 340 of the light shielding sheet 34 has a plurality of light transmitting portions 3402. The plurality of light-transmitting portions 3402 may have a hollow structure, but is not limited thereto. The first protrusions 341 of the shade 34 extend outwardly at a first predetermined location 3406 of the first edge 3404 of the cover portion 340 of the shade 34 and are spaced apart from each other by a first distance d 1. Each of the light-transmitting portions 3402 corresponds to one light-exiting region 306. The covering portion 340 of the light shielding sheet 34 is attached to the front surface 300 of the light guide plate 30, so that each light transmitting portion 3402 is aligned with its corresponding light exiting region 306.
As also shown in fig. 2 and 3, the reflector 36 includes a central portion 360 and a plurality of second protrusions 361. The second protrusions 361 of the retroreflective sheeting 36 extend outwardly at the second predetermined location 3604 at the second edge 3602 of the central portion 360 of the retroreflective sheeting 36 and are spaced apart from each other by a second distance d 2. The second predetermined position 3604 corresponds to the first predetermined position 3406. The central portion 360 of the reflector 36 is attached to the back surface 302 of the light guide plate 30.
As shown in fig. 3, the first width w1 of each of the first protrusions 341 of the light-shielding sheet 34 is equal to the second pitch d2, and the second width w2 of each of the second protrusions 361 of the light-reflecting sheet 36 is equal to the first pitch d 1. Each of the first protrusions 341 of the light-shielding sheet 34 is disposed between the second protrusions 361 of two adjacent reflectors 36, and is bent to be attached to the outer edge side 304 of the light guide plate 30 and the central portion 360 of the reflector 36. Each of the second protrusions 361 of the light-reflecting sheet 36 is disposed between the first protrusions 341 of two adjacent light-shielding sheets 34, and is bent to be attached to the outer edge side 304 of the light guide plate 30 and the cover portion 340 of the light-shielding sheet 34. Therefore, the light emitted from the backlight device 3 to the first protrusion 341 and the second protrusion 361 will not leak, and the unused light can be effectively recycled.
In one embodiment, as shown in fig. 2, the first predetermined position 3406 is located between two adjacent light-transmitting portions 3402 near the first edge 3404 of the cover portion 340 of the light-shielding sheet 34. When the backlight device 3 according to the present invention is assembled, the first predetermined position 3406 is also located between two adjacent light-transmitting portions 3402 near the outer edge side 304 of the light exit area 306. Generally, the light transmitted between two adjacent light-emitting areas 306 in the light guide plate 30 is low in utilization rate and needs to be effectively recycled.
In one embodiment, as shown in fig. 2 and 3, the light shielding sheet 34 of the backlight device 3 according to the preferred embodiment of the present invention further includes a first covering portion 342. The first wrapping portion 342 of the shade 34 extends outwardly from the first edge 3404 of the cover portion 340 except for the first predetermined location 3406. The retroreflective sheeting 36 also includes a second coating 362. The second cladding portion 362 of the retroreflective sheeting 36 extends outwardly from the second edge 3602 of the central portion 360 except at a second predetermined location 3604. The first cladding portion 342 of the light-shielding sheet 34 and the second cladding portion 362 of the light-reflecting sheet 36 are adhered together.
In another embodiment, the light-shielding sheet 34 of the backlight device 3 according to the preferred embodiment of the present invention does not include the first covering portion 342, the light-reflecting sheet 36 does not include the second covering portion 362, the plurality of first protrusions 341 surround all the first edges 3404 of the covering portions 340, and the plurality of second protrusions 361 surround all the second edges 3602 of the central portion 360.
In another embodiment, a plurality of first protrusions 341 extend outwardly between two adjacent light-transmitting portions 3402 at the first edge 3404 of the cover portion 340. The reflector 36 also has a plurality of second protrusions 361 extending outwardly at corresponding positions.
Further, as shown in fig. 2 and 4, the light guide plate 30 of the backlight device 3 according to the preferred embodiment of the present invention further has a first through hole 308. The covering portion 340 of the shade 34 has a second through hole 3408. The central portion 360 of the reflector 36 has a third through hole 3606. The second through hole 3408 of the cover portion 340 and the third through hole 3606 of the central portion 360 correspond to the first through hole 308 of the light guide plate 30. Correspondingly, the positioning pillars 222 are formed on the substrate 22. Positioning post 222 passes through first through hole 308, second through hole 3408, and third through hole 3606. In practical applications, a plurality of positioning pillars 222 are formed on the substrate 22, and correspondingly, the light guide plate 30 has a plurality of first through holes 308, the cover portion 340 has a plurality of second through holes 3408, and the central portion 360 has a plurality of third through holes 3606. In fig. 2, only one first via 308, one second via 3408, and one third via 3606 are shown as representatives.
In fig. 4, only a portion of the light guide plate 30, a portion of the light shielding sheet 34, and a portion of the light reflecting sheet 36 are shown for clarity, and the remaining portions of the first through hole 308, the second through hole 3408, and the third through hole 3606 are shown by dotted lines. As shown in fig. 4, the light shielding sheet 34 further includes a third cladding 343 surrounding the second through hole 3408 and a plurality of third protrusions 344. The plurality of third protruding portions 344 of the light-shielding sheet 34 extend inward at the third covering portion 343 of the light-shielding sheet 34 and are spaced apart from each other by a third distance d 3. The reflector 36 further includes a fourth cladding 363 surrounding the third through hole 3606 and a plurality of fourth protrusions 364. The fourth protrusions 364 of the retroreflective sheeting 36 extend inward at the fourth cladding 363 of the retroreflective sheeting 36 and are spaced apart from each other at a fourth spacing d 4. The third width w3 of each third protrusion 344 of the light-shielding sheet 34 is equal to the fourth spacing d 4. The fourth width w4 of each fourth protrusion 364 of the retroreflective sheeting 36 is equal to the third distance d 3. The third cladding 343 of the light shield 34 and the fourth cladding 363 of the light reflector 36 are disposed in the first through hole 308 of the light guide plate 30 and bonded together. Each third protrusion 344 of the light shield 34 is disposed between the fourth protrusions 364 of two adjacent reflectors 36, and is bent to fit the fourth cladding 363 of the reflector 36. Each of the fourth protruding portions 364 of the light reflecting sheet 36 is disposed between the third protruding portions 344 of two adjacent light-shielding sheets 34, and is bent to fit on the third covering portion 343 of the light-shielding sheet 34. Therefore, the light emitted from the backlight device 3 to the first through hole 308 of the light guide plate 30 will not leak, and the unused light can be effectively recycled.
From the above detailed description of the present invention, it is clear that the backlight device of the present invention can avoid light leakage and effectively recycle the unused light.
The above detailed description of the preferred embodiments is intended to more clearly illustrate the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. The scope of the invention is therefore to be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the scope of the appended claims.
Claims (5)
1. A backlight device for use in a lighted keyboard, the lighted keyboard including a plurality of keys, the backlight device comprising:
the light guide plate is provided with a front surface, a back surface and an outer edge side surface, wherein a plurality of light emergent areas are defined on the front surface, and each light emergent area corresponds to one key;
the light source is used for emitting light rays, the light source is arranged to enable the light rays to be emitted into the light guide plate, the light rays are guided to the front face by the light guide plate, and then the light rays are emitted from the light emitting areas on the front face;
the shading sheet comprises a covering part and a plurality of first protruding parts, wherein the covering part is provided with a plurality of light-transmitting parts, the plurality of first protruding parts extend outwards at a first preset position of a first edge of the covering part and are mutually spaced at a first interval, each light-transmitting part corresponds to one light-emitting area, and the covering part is attached to the front surface of the light guide plate to enable each light-transmitting part to be aligned with the corresponding light-emitting area; and
the light reflecting sheet comprises a central part and a plurality of second protruding parts, the second protruding parts extend outwards at a second preset position of a second edge of the central part and are spaced at intervals of a second interval, the second preset position corresponds to the first preset position, and the central part is attached to the back surface of the light guide plate;
wherein the first width of each first protruding portion is equal to the second spacing, the second width of each second protruding portion is equal to the first spacing, each first protruding portion is disposed between two adjacent second protruding portions and bent to be attached to the outer edge side surface and the central portion, and each second protruding portion is disposed between two adjacent first protruding portions and bent to be attached to the outer edge side surface and the covering portion;
the light guide plate further has a first through hole, the cover portion has a second through hole, the central portion has a third through hole, the second through hole and the third through hole both correspond to the first through hole, the light-shielding sheet further includes a third cladding portion surrounding the second through hole and a plurality of third protruding portions extending inward at the third cladding portion and spaced apart from each other at a third interval, the light-reflecting sheet further includes a fourth cladding portion surrounding the third through hole and a plurality of fourth protruding portions extending inward at the fourth cladding portion and spaced apart from each other at a fourth interval, a third width of each third protruding portion is equal to the fourth interval, a fourth width of each fourth protruding portion is equal to the third interval, the third cladding portion and the fourth cladding portion are disposed in the first through hole and bonded together, each third protruding portion is disposed between two adjacent fourth protruding portions and bent to be bonded to the fourth cladding portion, each fourth protruding part is arranged between two adjacent third protruding parts and is bent to be attached to the third coating part.
2. The backlight device according to claim 1, wherein: the first predetermined position is located between two adjacent light-transmitting portions near the first edge of the cover portion.
3. The backlight device according to claim 2, wherein: the light-shielding sheet further comprises a first covering part, the first covering part extends outwards from the first edge of the covering part except the first preset position, the light-reflecting sheet further comprises a second covering part, the second covering part extends outwards from the second edge of the central part except the second preset position, and the first covering part and the second covering part are attached together.
4. The backlight device according to claim 3, wherein: the backlight device further comprises:
and the light turning structures are formed on the back surface and positioned below the light emergent areas and used for guiding the light rays emitted to the light turning structures to the front surface so as to be emitted from the light emergent areas on the front surface.
5. A backlight device for use in a lighted keyboard, the lighted keyboard including a plurality of keys, the backlight device comprising:
the light guide plate is provided with a front surface, a back surface and a first through hole, wherein a plurality of light emergent areas are defined on the front surface, and each light emergent area corresponds to one key;
the light source is used for emitting light rays, the light source is arranged to enable the light rays to be emitted into the light guide plate, the light rays are guided to the front face by the light guide plate, and then the light rays are emitted from the light emitting area on the front face;
the shading sheet comprises a covering part, a first coating part and a plurality of first protruding parts, wherein the covering part is provided with a plurality of light transmission parts and second through holes, each light transmission part corresponds to one light emergent area, each second through hole corresponds to one first through hole, the shading sheet also comprises a first coating part and a plurality of first protruding parts, the first coating parts extend inwards at the first coating part and are spaced at intervals with a first interval, and the covering part is attached to the front surface so that each light transmission part is aligned with the corresponding light emergent area; and
the light reflecting sheet comprises a central part, a second coating part and a plurality of second protruding parts, wherein the central part is provided with a third through hole, the third through hole corresponds to the first through hole, the second coating part surrounds the third through hole, the plurality of second protruding parts extend inwards at the second coating part and are spaced at a second interval, and the central part is attached to the back surface;
the first width of each first protruding portion is equal to the second interval, the second width of each second protruding portion is equal to the first interval, the first coating portion and the second coating portion are arranged in the first through hole and are attached together, each first protruding portion is arranged between two adjacent second protruding portions and is bent to be attached to the second coating portion, and each second protruding portion is arranged between two adjacent first protruding portions and is bent to be attached to the first coating portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918624.XA CN109036928B (en) | 2018-08-13 | 2018-08-13 | Backlight device for use in luminous keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918624.XA CN109036928B (en) | 2018-08-13 | 2018-08-13 | Backlight device for use in luminous keyboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109036928A CN109036928A (en) | 2018-12-18 |
| CN109036928B true CN109036928B (en) | 2020-08-18 |
Family
ID=64633046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810918624.XA Active CN109036928B (en) | 2018-08-13 | 2018-08-13 | Backlight device for use in luminous keyboard |
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| JPH09292533A (en) * | 1996-04-26 | 1997-11-11 | Casio Comput Co Ltd | Lighting device |
| CN201417429Y (en) * | 2009-03-30 | 2010-03-03 | 苏州达方电子有限公司 | Illumination keyboard |
| CN203617190U (en) * | 2013-11-26 | 2014-05-28 | 源曜光电股份有限公司 | Keyboard light-emitting module |
| CN204062675U (en) * | 2014-08-01 | 2014-12-31 | 闳晖实业股份有限公司 | Backlight module |
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