CN217468261U - Light-emitting keyboard and backlight device for same - Google Patents
Light-emitting keyboard and backlight device for same Download PDFInfo
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- CN217468261U CN217468261U CN202221033281.7U CN202221033281U CN217468261U CN 217468261 U CN217468261 U CN 217468261U CN 202221033281 U CN202221033281 U CN 202221033281U CN 217468261 U CN217468261 U CN 217468261U
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Abstract
The utility model discloses a luminous keyboard and be used for device in a poor light of luminous keyboard, this device in a poor light contain light guide plate, circuit board and a plurality of light emitting component. The light guide plate is provided with a plurality of through holes. The light-emitting elements are electrically connected to the circuit board. Each light emitting element corresponds to one through hole. The circuit board is arranged on the back surface of the light guide plate, so that each light-emitting element is arranged in the corresponding through hole, and the light-emitting side surface of each light-emitting element faces to the light-in surface of the corresponding through hole. Each light emitting element emits light from the light emitting side surface to the light incident surface of the corresponding through hole so as to enter the light guide plate. The light incident surface of a specific through hole in the through holes is provided with an optical adjusting surface, and the optical adjusting surface is provided with a curved surface central axis which is coaxial with the central optical axis of the corresponding light-emitting element. According to the utility model discloses a backlight device for luminous keyboard effectively utilizes the energy of light emitting component emission, the utility model discloses a luminance of the pattern on its key cap of luminous keyboard is even.
Description
Technical Field
The present invention relates to a light emitting keyboard and a backlight device for the same, and more particularly to a backlight device capable of modulating the angle of light beams emitted from light emitting elements and incident into a light guide plate.
Background
An illuminated keyboard is a common input peripheral device on the market. Most of the existing luminous keyboards adopt backlight devices.
The prior art backlight device for a light-emitting keyboard comprises a light guide plate and a plurality of light-emitting elements. The light guide plate is provided with a plurality of through holes. Each light-emitting element is arranged in the corresponding through hole, and the light-emitting side surface of each light-emitting element faces to the light-in surface of the corresponding through hole. Each light emitting element emits light from the light emitting side surface to the light incident surface of the corresponding through hole so as to enter the light guide plate. It should be emphasized that, in the prior art backlight device, the light incident surfaces of the through holes are all flat planes, so that the beam angle of the light emitted by the light emitting element incident into the light guide plate is fixed.
However, the light guide plate of the backlight device in the prior art also has a plurality of holes formed thereon for assembling the light-emitting keyboard. In the prior art, the arrangement design of the light emitting elements of the backlight device may cause the emitted light to be closer to the two adjacent broken holes on the traveling path of the light guide plate, which may result in lighting shadows behind the broken holes and make inefficient use of the energy of the light emitted by the light emitting elements.
Further, in the case where the backlight device of the prior art cannot increase the number of light emitting elements due to the limitation of a mechanism or a circuit board for electrically bonding a plurality of light emitting elements, the luminance of the pattern on the key top of the light emitting keyboard is not uniform.
SUMMERY OF THE UTILITY MODEL
Therefore, the present invention is to provide a backlight device for a light-emitting keyboard and a light-emitting keyboard using the backlight device, which can adjust the angle of the light beam emitted from the light-emitting element into the light guide plate.
According to the present invention, a backlight device is provided for a light-emitting keyboard. The backlight device according to the preferred embodiment of the present invention comprises a light guide plate, a circuit board and a plurality of light emitting elements. The light guide plate is provided with a top surface, a back surface and a plurality of through holes. Each through hole is provided with a light incident surface. The light-emitting elements are electrically connected to the circuit board. Each light-emitting element is provided with a light-emitting side surface and a central optical axis, and each light-emitting element corresponds to one through hole. The circuit board is arranged on the back surface of the light guide plate, so that each light-emitting element is arranged in the corresponding through hole, and the light-emitting side surface of each light-emitting element faces to the light-in surface of the corresponding through hole. Each light emitting element emits light from the light emitting side surface to the light incident surface of the corresponding through hole, and then the light is incident into the light guide plate. The plurality of through holes comprise at least one first through hole, and a first optical adjustment surface is arranged on the light incident surface of each first through hole. The first optical adjustment surface may be one or any combination of a first concave spherical surface, a first convex spherical surface, a first concave aspherical surface, a first convex aspherical surface, a first fresnel concave arc surface, a first fresnel convex arc surface, and the like. The first optical adjustment surface is provided with a first curved surface central axis which is coaxial with the central optical axis of the corresponding light-emitting element.
In an embodiment, a first shortest distance between the first optical adjustment surface of the first through hole and the light emitting side surface of the corresponding light emitting element may be in a range of 0.04 to 0.12 mm.
In an embodiment, the light guide plate further has a first hole. The first broken hole is positioned on a first original optical path of the light ray which enters the light guide plate from the light inlet surface of the first through hole. The first original optical path is a path of a boundary of a light beam which is adjusted by the first optical adjusting surface of the first through hole and enters the light guide plate, wherein the first original optical path is formed by the light beam which is bundled and enters the light incident surface of the first through hole, which is only a flat plane and has no first optical adjusting surface, and the light incident surface is a light beam which travels on the light guide plate.
In an embodiment, the light guide plate further has a second hole. The second broken hole is positioned on a second original optical path of the light ray which enters the light guide plate from the light inlet surface of the first through hole. The second adjusting optical path of the light ray after being adjusted by the first optical adjusting surface of the first through hole and further entering the light guide plate does not pass through the second broken hole. The first adjusting optical path and the second adjusting optical path are located between the first hole and the second hole.
According to a variation of the backlight device of the present invention, the plurality of through holes further includes at least one second through hole, each second through hole having a recess formed on the light incident surface. The recess of the second through hole is provided with a second optical adjustment surface facing the light-emitting side surface of the corresponding light-emitting element. The second optical adjustment surface can be one of or any combination of a second convex spherical surface, a second convex aspherical surface, a second Fresnel convex arc surface and the like. The second optical adjustment surface is provided with a second curved surface central axis which is coaxial with the central optical axis of the corresponding light-emitting element.
In an embodiment, a second shortest distance between the second optical adjustment surface of the second through hole and the light emitting side surface of the corresponding light emitting element may be in a range of 0.04 to 0.12 mm.
According to another variation of the backlight device of the present invention, the plurality of through holes further includes at least one third through hole, each third through hole having a protrusion formed on the light incident surface. The protruding part of the third through hole is provided with a third optical adjustment surface facing the light-emitting side surface of the light-emitting element corresponding to the protruding part. The third optical adjustment surface may be one of or any combination of a second concave spherical surface, a second concave aspherical surface, a second fresnel concave arc surface, and the like. The third optical adjustment surface has a third curved surface central axis coaxial with the central optical axis of the corresponding light-emitting element.
In an embodiment, a third shortest distance between the third optical adjustment surface of the third through hole and the light emitting side surface of the corresponding light emitting element may be in a range of 0.04 to 0.12 mm.
In one embodiment, the backlight device further includes a light shielding film disposed on the top surface of the light guide plate, and a light reflecting sheet disposed on the back surface of the light guide plate, the light shielding film having a plurality of light transmitting portions, light emitted from the light emitting elements into the light guide plate being guided by the light guide plate to be emitted from the light transmitting portions of the light shielding film, the light reflecting sheet being configured to reflect light emitted toward the light reflecting sheet.
Furthermore, the utility model discloses still provide a luminous keyboard, its aforementioned backlight unit.
Different from the prior art, according to the backlight device for the light-emitting keyboard of the present invention, the light beam angle of the light emitted from the light-emitting element into the light guide plate can be adjusted. Therefore, the backlight device for the light-emitting keyboard of the present invention effectively utilizes the energy of the light emitted from the light-emitting element. The application is according to the utility model discloses a luminance of the pattern on its key cap of backlight unit's luminous keyboard is even.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
Drawings
Fig. 1 is a partial cross-sectional view of a backlight apparatus for a light-emitting keyboard according to a preferred embodiment of the present invention.
Fig. 2 is a partial top view of an example of a backlight device for an illuminated keyboard according to a preferred embodiment of the present invention.
Fig. 3 is a partial top view of another example of a backlight device for an illuminated keyboard according to a preferred embodiment of the present invention.
Fig. 4 is a partial top view of another example of a backlight device for an illuminated keyboard according to a preferred embodiment of the present invention.
Fig. 5 is a partial top view of another example of a backlight device for an illuminated keyboard according to a preferred embodiment of the present invention.
Fig. 6 is a partial top view of another example of a backlight device for an illuminated keyboard according to a preferred embodiment of the present invention.
Fig. 7 is a partial top view of a variation of a backlight for a lighted keyboard in accordance with a preferred embodiment of the present invention.
Fig. 8 is a partial top view of another variation of a backlight for a lighted keyboard in accordance with a preferred embodiment of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 to 5, fig. 1 to 5 schematically depict a backlight device 1 for a light-emitting keyboard according to a preferred embodiment of the present invention. Fig. 1 schematically shows a backlight device 1 according to a preferred embodiment of the present invention in a partial cross-sectional view. Fig. 2 schematically shows an example of the backlight device 1 according to a preferred embodiment of the present invention in a partial top view. Fig. 3 schematically shows another example of the backlight device 1 according to a preferred embodiment of the present invention in a partial top view. Fig. 4 schematically shows another example of the backlight device 1 according to a preferred embodiment of the present invention in a partial top view. Fig. 5 schematically shows another example of the backlight device 1 according to a preferred embodiment of the present invention in a partial top view.
As shown in fig. 1 and 2, a backlight device 1 according to a preferred embodiment of the present invention includes a light guide plate 10, a circuit board 12 and a plurality of light emitting elements 14. The light guide plate 10 has a top surface 100, a back surface 102 and a plurality of through holes 104.
In one embodiment, the light guide plate 10 may be made of acryl, silicone, Thermoplastic Polyurethane (TPU), or other commercially available light-guiding polymer materials. The layer thickness of the light guide plate 10 may be determined as needed, and is not particularly limited.
Each through hole 104 has a respective light incident surface 1040 (or each through hole 104 has a respective light incident surface 1040). The light-emitting elements 14 are electrically connected to the circuit board 12. Each light emitting element 14 has a respective light emitting side surface 140 (or each light emitting element 14 has a respective light emitting side surface 140) and a respective central optical axis 142 (or each light emitting element 14 has a respective central optical axis 142), and each light emitting element 14 corresponds to one through hole 104. The circuit board 12 is disposed on the back surface 102 of the light guide plate 10, such that each light emitting element 14 is disposed in the corresponding through hole 104, and the light emitting side 140 of each light emitting element 14 faces the light incident surface 1040 of the corresponding through hole 104. Each light emitting element 14 emits light from the light emitting side surface 140 to the light incident surface 1040 of the corresponding through hole 104, and further enters the light guide plate 10.
In an embodiment, the light emitting device 14 may be a light emitting diode or an organic light emitting diode, but the invention is not limited thereto.
Specifically, the plurality of through holes 104 includes at least one first specific through hole 104a defined as at least one first through hole 104a, and the incident surface 1040 of each first through hole 104a has a first optical adjustment surface 1041. The first optical adjustment surface 1041 may be one of a first convex spherical surface, a first concave aspherical surface, a first convex aspherical surface, a first fresnel concave arc surface, or a first fresnel convex arc surface. The first optical adjustment surface 1041 has a first curved central axis 1042 coaxial with the central optical axis 142 of the corresponding light emitting element 14. In the example shown in fig. 2, the first optical adjustment surface 1041 is a first convex spherical surface. In the example shown in fig. 3, the first optical adjustment surface 1041 is a first concave spherical surface. In the example shown in fig. 4, the first optical adjustment surface 1041 is a first fresnel convex arc surface. In the example shown in fig. 5, the first optical adjustment surface 1041 is a first fresnel concave arc surface. The components in fig. 3, 4 and 5 having the same reference numerals as those in fig. 2 have the same or similar structures and functions, and are not repeated herein. When the first optical adjustment surface 1041 is a first convex spherical surface, a first convex aspheric surface, or a first fresnel convex arc surface, the angle of the light beam emitted by the light emitting element 14 and entering the light guide plate 10 is contracted, that is, the first optical adjustment surface 1041 is selected to have a light condensing effect on the light emitted by the light emitting element 14 according to the structure of the light guide plate 10. When the first optical adjustment surface 1041 is a first concave spherical surface, a first concave aspherical surface, or a first fresnel concave arc surface, the angle of the light beam emitted by the light emitting element 14 and entering the light guide plate 10 is widened, that is, the first optical adjustment surface 1041 is selected to have an effect of scattering light emitted by the light emitting element 14 according to the structure of the light guide plate 10. Thus, by the design of the light incident surface 1040 of the at least one first through hole 104a, the angle of the light beam emitted into the light guide plate 10 by the light emitting element 14 can be adjusted to meet the actual requirement.
In practical operation, when there is a structure affecting normal transmission of light in a local area of the backlight device 1, the first through hole 104a can be set as the through hole corresponding to the light emitting element 14, and at this time, the first optical adjustment surface 1041 of the first through hole 104a is one of the first convex spherical surface, the first convex aspherical surface, and the first fresnel convex arc surface, so that the light emitted by the light emitting element disposed therein will be shrunk (to form a condensed light beam), thereby bypassing the structure affecting normal transmission of light and avoiding the decrease of light uniformity caused therein.
In practical operation, when the overall brightness requirement of the light required to be provided by the local area or the overall area of the backlight device 1 is not high or the brightness of the light provided by the light emitting element 14 is sufficient, the through hole corresponding to at least one light emitting element 14 is set as the first through hole 104a, and the first optical adjustment surface 1041 of the first through hole 104a is one of the first concave spherical surface, the first concave aspherical surface, and the first fresnel concave curved surface, so that the light emitted by the light emitting element 14 disposed therein is diffused to a greater extent (to form an astigmatic light beam), thereby reducing the usage amount of the light emitting elements and the number of the through holes in the entire backlight device 1, and improving the performance.
In one embodiment, the first optical adjustment surface 1041 can be formed by stamping or computer numerical control machining.
In an embodiment, in order to accommodate the plurality of light emitting elements 14 to be disposed in the corresponding through holes 104, and considering the processing and manufacturing tolerance of the light guide plate 10, the circuit board 12 and other elements and components, the first shortest distance range d1 between the first optical adjustment surface 1041 of the first through hole 104a and the light emitting side surface 140 of the corresponding light emitting element 14 may be 0.04-0.12 mm. And the first shortest distance range d1 takes into consideration the optical design parameters (e.g., focal length) of the first optical adjustment surface 1041.
Referring to fig. 6, fig. 6 is a partial plan view schematically showing another example of the backlight device 1 according to the preferred embodiment of the present invention. As shown in fig. 6, in an embodiment, the light guide plate 10 further has a first hole 106. The first hole 106 is located on the first original optical path P1 through which the light enters the light guide plate 10 from the light incident surface 1040 of the first through hole 104 a. Here, the first original optical path P1 is a path of the bundled light beam entering the light incident surface 1040, which is only a flat plane and has no first optical adjustment surface 1041 thereon, of the first through hole 104a at a boundary of the light beam traveling through the light guide plate 10. Notably, a light ray traveling along the first original optical path P1 encounters the first hole 106. The first adjusting optical path P2 after the light is adjusted by the first optical adjustment surface 1041 of the first through hole 104a and enters the light guide plate 10 does not pass through the first broken hole 106. Here, the first adjustment optical path P2 is also a path at one boundary of the light beam traveling through the light guide plate 10. The components in fig. 6 having the same reference numerals as those in fig. 2 have the same or similar structures and functions, and are not repeated herein.
As also shown in fig. 6, in an embodiment, the light guide plate 10 further has a second hole 108. The second hole 108 is located on the second original optical path P3 through which the light enters the light guide plate 10 from the light incident surface 1040 of the first through hole 104 a. Here, the second original optical path P3 is a path of the bundled light entering the light incident surface 1040 of the first through hole 104a, which is only a flat plane and has no first optical adjustment surface 1041 thereon, at the other boundary of the light beam traveling through the light guide plate 10. Notably, the light ray traveling along the second original optical path P3 encounters the second hole 108. The second adjusting optical path P4 after the light is adjusted by the first optical adjustment surface 1041 of the first through hole 104a and enters the light guide plate 10 does not pass through the second through hole 108. Here, the second adjustment optical path P4 is also a path at the other boundary of the light beam traveling through the light guide plate 10. The first adjusting optical path P2 and the second adjusting optical path P4 are located between the first hole 106 and the second hole 108. In the embodiment shown in fig. 6, the first hole 106 and the second hole 108 are structures that affect the normal transmission of light, and the optical path can avoid the hole-breaking region by adjusting the first optical adjustment surface 1041 on the light incident surface 1040 of the at least one first through hole 104a, so as to avoid the problem of poor uniformity caused by too bright light in the hole-breaking region. Thus, the backlight device 1 according to the preferred embodiment of the present invention can effectively utilize the energy of the light emitted from the light emitting elements 14.
The backlight device 1 according to the preferred embodiment of the present invention further includes a light shielding film (not shown) and a light reflecting sheet (not shown). The light shielding film is disposed on the top surface 100 of the light guide plate 10. The reflective sheet is disposed on the back surface 102 of the light guide plate 10. The light shielding film has a plurality of light transmitting portions. The light rays incident into the light guide plate 10 are guided by the light guide plate 10 to be emitted from the plurality of light-transmitting portions of the light shielding film. The reflector is used for reflecting the light rays emitted to the reflector.
Referring to fig. 7, fig. 7 is a partial top view schematically illustrating a variation of the backlight device 1 according to the preferred embodiment of the present invention. As shown in FIG. 7, in a variation of the backlight device 1 according to the preferred embodiment of the present invention, the plurality of through holes 104 further has at least one second specific through hole 104b defined as at least one second through hole 104b, and each second through hole 104b has a recess 1043 formed on the light incident surface 1040. The recess 1043 of the second through hole 104b has a second optical adjustment surface 1044 facing the light emitting side surface 140 of the corresponding light emitting element 14. The second optical adjustment surface 1044 may be one of or any combination of a second convex spherical surface, a second convex aspherical surface, a second fresnel convex arc surface, and the like. The second optical adjustment surface 1044 has a second curved central axis 1045 coaxial with the central optical axis 142 of the corresponding light-emitting element 14. In the example shown in fig. 7, the second optical adjustment surface 1044 is a second convex spherical surface. The components in fig. 7 having the same reference numerals as those in fig. 2 have the same or similar structures and functions, and are not repeated herein. When the second optical adjustment surface 1044 is a second convex spherical surface, a second convex aspheric surface, a second fresnel convex arc surface, or any combination thereof, the angle of the light beam emitted by the light emitting element 14 and incident into the light guide plate 10 is shrunk, that is, the second optical adjustment surface 1044 has a light condensing effect on the light emitted by the light emitting element 14.
In practical operation, when there is a structure affecting normal light transmission, such as a broken hole, in a local area of the backlight device, the through hole corresponding to at least one light emitting element is set as the second through hole, so that the light emitted by the light emitting element disposed therein will be shrunk (to form a condensed light beam), thereby avoiding the structure affecting normal light transmission and avoiding the decrease of light uniformity.
In an embodiment, similarly, in order to accommodate the plurality of light emitting elements 14 to be disposed in the corresponding through holes 104, and considering the processing and manufacturing tolerances of the light guide plate 10, the circuit board 12 and other elements and components, the second shortest distance range d2 between the second optical adjustment surface 1044 of the second through hole 104b and the light emitting side surface 140 of the corresponding light emitting element 14 may be 0.04 to 0.12 mm. And the second shortest distance range d2 takes into consideration the optical design parameters (e.g., focal length) of the second optical adjustment surface 1044.
Referring to fig. 8, fig. 8 is a partial plan view schematically showing another variation of the backlight device 1 according to the preferred embodiment of the present invention. As shown in fig. 8, in another variation of the backlight device 1 according to the preferred embodiment of the present invention, the plurality of through holes 104 further has at least one third specific through hole 104c defined as at least one third through hole 104c, and each third through hole 104c has a protrusion 1046 formed on the light incident surface 1040. The protruding portion 1046 of the third through hole 104c has a third optical adjustment surface 1047 facing the light emitting side surface 140 of the corresponding light emitting element 14. The third optical adjustment surface 1047 may be one of or any combination of a second concave spherical surface, a second concave aspherical surface, or a second fresnel concave arc surface. The third optical adjustment surface 1047 has a third curved surface central axis 1048 coaxial with the central optical axis 142 of the corresponding light emitting element 14. In the example shown in fig. 8, the third optical adjustment surface 1047 is a second concave spherical surface. The components in fig. 8 having the same reference numerals as those in fig. 2 have the same or similar structures and functions, and are not repeated herein. When the third optical adjustment surface 1047 is a second concave spherical surface, a second concave aspheric surface, a second fresnel concave arc surface, or any combination thereof, the angle of the light beam emitted by the light emitting element 14 and incident into the light guide plate 10 is widened, that is, the third optical adjustment surface 1047 has an effect of dispersing light for the light emitted by the light emitting element 14.
In practical operation, when the overall brightness requirement of the light required to be provided by the local area or the overall area in the backlight device is not high or the brightness of the light provided by the light emitting element body is sufficient, the through hole corresponding to at least one light emitting element can be set as the third through hole, so that the light emitted by the light emitting element arranged therein can be diffused to a greater extent (to form an astigmatic light beam), thereby reducing the usage amount of the light emitting element and the number of the through holes in the whole backlight device and improving the efficiency.
In an embodiment, similarly, in order to cooperatively dispose the plurality of light emitting elements 14 in the corresponding through holes 104, and considering the processing and manufacturing tolerances of the components and members such as the light guide plate 10 and the circuit board 12, the third shortest distance range d3 between the third optical adjustment surface 1047 of the third through hole 104c and the light emitting side surface 140 of the corresponding light emitting element 14 may be 0.04 to 0.12 mm. And the third shortest distance range d3 takes into account the optical design parameters (e.g., focal length) of the third optical adjustment surface 1047.
In addition, the present invention also discloses a light-emitting keyboard (not shown), which includes the backlight device 1, wherein the brightness of the pattern on each key cap of the light-emitting keyboard is uniform.
By the above, it can be clearly understood that the light beam angle of the light emitting element emitting light into the light guide plate can be adjusted according to the backlight device for the light emitting keyboard of the present invention. Therefore, the backlight device for the light-emitting keyboard of the present invention effectively utilizes the energy of the light emitted from the light-emitting element. The application is according to the utility model discloses a backlight unit's luminous keyboard, the luminance of the pattern on its key cap is even.
Of course, the present invention may have other embodiments, and those skilled in the art may make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the protection scope of the appended claims.
Claims (10)
1. A backlight apparatus for a light-emitting keyboard, comprising:
the light guide plate is provided with a top surface, a back surface and a plurality of through holes, and each through hole is provided with a light incident surface;
a circuit board; and
a plurality of light-emitting elements electrically connected to the circuit board, each light-emitting element having a light-emitting side surface and a central optical axis and corresponding to a through hole, wherein the circuit board is disposed on the back surface of the light guide plate such that each light-emitting element is disposed in the corresponding through hole and the light-emitting side surface of each light-emitting element faces the light-incident surface of the corresponding through hole, and each light-emitting element emits light from the light-emitting side surface to the light-incident surface of the corresponding through hole and further emits the light into the light guide plate;
the plurality of through holes comprise at least one first through hole, the light incident surface of each first through hole is provided with a first optical adjusting surface, the first optical adjusting surface is selected from one of a first concave spherical surface, a first convex spherical surface, a first concave aspheric surface, a first convex aspheric surface, a first Fresnel concave cambered surface and a first Fresnel convex cambered surface, and the first optical adjusting surface is provided with a first curved surface central axis which is coaxial with the central optical axis of the corresponding light-emitting element.
2. The backlight device according to claim 1, wherein a first shortest distance between the first optical adjustment surface of the first through hole and the light emitting side surface of the corresponding light emitting element is in a range of 0.04-0.12 mm.
3. The backlight device as claimed in claim 1, wherein the light guide plate further has a first hole on a first original optical path through which the light beam enters the light guide plate from the light incident surface of the first through hole, the first adjusted optical path after the light beam is adjusted by the first optical adjustment surface of the first through hole and enters the light guide plate does not pass through the first hole, wherein the first original optical path is a path of a boundary of the light beam traveling on the light guide plate when the bundled light beam enters the light incident surface of the first through hole which is only a flat plane and on which the first optical adjustment surface is absent.
4. The backlight device as claimed in claim 3, wherein the light guide plate further has a second hole on a second original optical path through which the light enters the light guide plate from the light incident surface of the first through hole, a second adjusted optical path through which the light is adjusted by the first optical adjustment surface of the first through hole and enters the light guide plate does not pass through the second hole, and the first adjusted optical path and the second adjusted optical path are located between the first hole and the second hole.
5. The backlight device of claim 1, wherein the plurality of through holes further comprises at least one second through hole, each second through hole has a recess formed on the light incident surface, the recess has a second optical adjustment surface facing the light emitting side of the corresponding light emitting element, the second optical adjustment surface is selected from one or any combination of a second convex spherical surface, a second convex aspherical surface and a second Fresnel convex cambered surface, and the second optical adjustment surface has a second cambered central axis coaxial with the central optical axis of the corresponding light emitting element.
6. The backlight device according to claim 5, wherein a second shortest distance between the second optical adjustment surface of the second through hole and the light-emitting side surface of the corresponding light-emitting element is in a range of 0.04-0.12 mm.
7. The backlight device of claim 1, wherein the plurality of through holes further comprises at least one third through hole, each third through hole has a protrusion formed on the light incident surface, the protrusion has a third optical adjustment surface facing the light emitting side of the corresponding light emitting element, the third optical adjustment surface is selected from one or any combination of a second concave spherical surface, a second concave aspherical surface and a second Fresnel concave cambered surface, and the third optical adjustment surface has a third cambered central axis coaxial with the central optical axis of the corresponding light emitting element.
8. The backlight device as claimed in claim 7, wherein a third shortest distance between the third optical adjustment surface of the third specific through hole and the light emitting side surface of the corresponding light emitting element is in a range of 0.04-0.12 mm.
9. The backlight device as claimed in claim 1, further comprising a light shielding film disposed on the top surface of the light guide plate, and a light reflecting sheet disposed on the back surface of the light guide plate, the light shielding film having a plurality of light transmitting portions, wherein the light emitted from the light emitting elements into the light guide plate is guided by the light guide plate to be emitted from the plurality of light transmitting portions of the light shielding film, and the light reflecting sheet is configured to reflect the light emitted toward the light reflecting sheet.
10. A light-emitting keyboard comprising the backlight device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221033281.7U CN217468261U (en) | 2022-04-29 | 2022-04-29 | Light-emitting keyboard and backlight device for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221033281.7U CN217468261U (en) | 2022-04-29 | 2022-04-29 | Light-emitting keyboard and backlight device for same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217468261U true CN217468261U (en) | 2022-09-20 |
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ID=83273926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221033281.7U Active CN217468261U (en) | 2022-04-29 | 2022-04-29 | Light-emitting keyboard and backlight device for same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217468261U (en) |
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2022
- 2022-04-29 CN CN202221033281.7U patent/CN217468261U/en active Active
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