Multi-key backlight panel

Abstract

The utility model discloses a multi-key backlight panel which comprises a surface film, an upper interlayer double-faced adhesive tape, a PET (polyethylene terephthalate) fixing layer, a middle interlayer double-faced adhesive tape, a black lining layer, a lower interlayer double-faced adhesive tape and a circuit board are sequentially arranged below the surface film, and the top surface of the surface film is respectively provided with a first through groove and a second through groove. The first through groove and the second through groove are internally provided with a light-emitting area and a key respectively, and the circuit board is provided with a light guide column piece which is arranged in the light-emitting area. According to the utility model, through cooperation of the LED lamps, the light guide columns and the LGF dot matrix, through structural design and circuit control, backlight luminescence of a plurality of keys can be realized, and the LED lamps are stable in luminescence and basically have no brightness attenuation phenomenon.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane switch production, in particular to a multi-button backlight panel. Background Art

[0002] A membrane switch is an integrated operating system that combines key functions, indicator elements, and instrument panels. It consists of a panel, upper circuit, isolation layer, and lower circuit. When the membrane switch is pressed, the contacts in the upper circuit deform downward, connecting with the plates in the lower circuit. When the finger is released, the contacts in the upper circuit rebound, breaking the circuit and triggering a signal. Membrane switches feature a rigorous structure, attractive appearance, and excellent sealing. They are moisture-resistant and have a long service life. They are widely used in electronic communications, electronic measurement instruments, industrial control, medical equipment, the automotive industry, smart toys, and household appliances.

[0003] However, current membrane switch production generally requires adding an EL cold light sheet structure below the buttons or icons. This is expensive and requires an additional inverter. The brightness of the EL light sheet will significantly decrease after one year of use, and it is difficult to achieve the requirement of controlling the lighting of multiple icons separately. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a multi-button backlight panel.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a multi-button backlight panel, including a mask, an upper partition layer of double-sided tape, a PET fixing layer, a middle partition layer of double-sided tape, a black lining layer, a lower partition layer of double-sided tape and a circuit board are sequentially arranged below the mask, a first through groove and a second through groove are respectively provided on the top surface of the mask, a luminous area and a button are respectively arranged in the first through groove and the second through groove, a light-guiding column is provided on the circuit board, and is arranged in the luminous area.

[0006] As a further description of the above technical solution: the top surface of the upper spacer double-sided tape passes through a plurality of equally distributed first cavities and second cavities, and the first cavity and the second cavity located in the middle are connected to each other.

[0007] As a further description of the above technical solution: the top surface of the PET fixed layer is provided with a plurality of third cavities that are equidistantly distributed and aligned with the second cavity, and a rice-shaped incision is provided between every two of the third cavities, and the rice-shaped incision passes through the PET fixed layer. The outer circle of the PET fixed layer is made of opaque PET material, and the inner circle is an LGP composed of a light-guiding film and a reflective film, and an LGF dot matrix is provided on the light-guiding film, and one LGF dot matrix is provided under each of the light-emitting areas.

[0008] As a further description of the above technical solution: the top surface of the middle partition layer double-sided tape is provided with a plurality of fourth cavities and fifth cavities adapted to the first cavity and the second cavity, the top surface of the black lining layer is provided with a plurality of equally distributed seventh cavities, and a plurality of equally distributed sixth cavities are provided between every two of the seventh cavities. The top surface of the lower partition layer double-sided tape is provided with a plurality of equally distributed eighth cavities and ninth cavities, respectively. The lower partition layer double-sided tape is made of black opaque material. The top surface of the circuit board is provided with a plurality of springs, and each spring is provided under the LGF dot matrix. The top surface of the circuit board is fixedly connected to a plurality of equally distributed LED lamps, the height of the LED lamp is less than the thickness of the lower partition layer double-sided tape, and the top surface of each LED lamp abuts against one of the light guide columns, the light guide columns are made of highly light-transmitting material, and aluminum foil is wrapped around the outside of the light guide columns.

[0009] As a further description of the above technical solution: a plurality of equally spaced support columns are vertically fixed on the top surface of the circuit board, and a sleeve hole is passed through the top surface of each material, and a support column is axially slidably inserted into each sleeve hole, and a groove is vertically provided on the top surface of the support column, and a movably connected protrusion is provided in the groove.

[0010] As a further description of the above technical solution: two mirror-symmetrical receiving grooves are vertically opened on the top surface of the protrusion, two mirror-symmetrical sliding grooves are horizontally opened in each of the receiving grooves, a slider is slidably connected in each of the sliding grooves, a spring is commonly fixed horizontally between the slider and the sliding groove, a push plate is commonly fixed between the two sliders, a positioning block is horizontally fixed at the end of the push plate, the positioning block slides axially through the receiving groove, two mirror-symmetrical positioning grooves are horizontally opened on the inner wall of the groove, a positioning block is movably inserted in each of the positioning grooves, and a shift block is fixed on the top surface of each push plate.

[0011] The utility model has the following beneficial effects:

[0012] Compared with the existing technology, this multi-key backlight panel can achieve backlighting of multiple keys through the cooperation of LED lights, light guides and LGF dot matrix, through structural design and circuit control, and the LED lights emit light stably with basically no brightness attenuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a top view of the overall structure of a multi-button backlight panel proposed in the utility model;

[0014] Figure 2 This is a main cross-sectional view of the basic structure of a multi-button backlight panel proposed by the utility model;

[0015] Figure 3This is a top view of the overall structure of the upper interlayer double-sided tape of a multi-button backlight panel proposed by the utility model;

[0016] Figure 4 This is a top view of the overall structure of the PET fixing layer of a multi-button backlight panel proposed in the utility model;

[0017] Figure 5 This is a top view of the overall structure of the double-sided adhesive tape in the middle layer of a multi-button backlight panel proposed by the present invention;

[0018] Figure 6 This is a top view of the overall structure of the black lining of a multi-button backlight panel proposed in the present invention;

[0019] Figure 7 This is a top view of the overall structure of the double-sided tape on the lower interlayer of a multi-button backlight panel proposed by the present invention;

[0020] Figure 8 This is a top view of the overall structure of the circuit board of a multi-button backlight panel proposed in the present invention;

[0021] Figure 9 A multi-button backlight panel proposed by the utility model Figure 2 A magnified view of the structure at point A.

[0022] Legend:

[0023] 1. Facial mask; 2. First through-slot; 3. Second through-slot; 4. Button; 5. Bump; 6. Shift block; 7. Luminous area; 8. Upper interlayer double-sided tape; 9. PET fixing layer; 10. Middle interlayer double-sided tape; 11. Black lining; 12. Lower interlayer double-sided tape; 13. Circuit board; 14. Support column; 15. Hole; 16. Shrapnel; 17. LED light; 18. LGF dot matrix; 19. First cavity; 20. Second cavity; 21. Third cavity; 22. Rice-shaped cutout; 23. Fourth cavity; 24. Fifth cavity; 25. Sixth cavity; 26. Seventh cavity; 27. Eighth cavity; 28. Ninth cavity; 29. Groove; 30. Storage slot; 31. Slide; 32. Spring; 33. Push plate; 34. Positioning slot; 35. Positioning block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Reference Figures 1 to 9 The utility model provides a multi-button backlight panel: comprising a mask 1, an upper interlayer double-sided adhesive tape 8, a PET fixing layer 9, a middle interlayer double-sided adhesive tape 10, a black lining layer 11, a lower interlayer double-sided adhesive tape 12 and a circuit board 13 are sequentially arranged below the mask 1. The mask 1 is bonded to the PET fixing layer 9 via the upper interlayer double-sided adhesive tape 8, and the PET fixing layer 9 is bonded to the black lining layer via the middle interlayer double-sided adhesive tape 10. The back of the circuit board 13 is coated with adhesive. The top surface of the mask 1 is provided with a first through groove 2 and a second through groove 3, respectively. The first through groove 2 and the second through groove 3 are respectively provided with a plurality of through-holes. A light-emitting area 7 and a button 4 are provided, a transparent window is provided in the first through-slot 2, a light-guiding column is provided on the circuit board 13, and is provided in the light-emitting area 7. The lower interlayer double-sided adhesive tape 12 is made of black opaque material. The top surface of the circuit board 13 is fixedly connected to a plurality of equally spaced LED lights 17. The brightness of the LED lights 17 is greater than 40 lm to ensure sufficient brightness. The height of the LED lights 17 is less than the thickness of the lower interlayer double-sided adhesive tape 12. The top surface of each LED light 17 abuts against a light guide column. The light guide column is made of highly transparent PMMA or PC material, and aluminum foil is wrapped around the outside of the light guide column.

[0026] The top surface of the upper interlayer double-sided tape 8 passes through a plurality of equally distributed first cavities 19 and second cavities 20. The first cavity 19 and the second cavity 20 in the middle are connected to each other. The top surface of the PET fixed layer 9 is provided with a plurality of equally distributed third cavities 21 aligned with the second cavity 20. There is a rice-shaped incision 22 between each two third cavities 21. The rice-shaped incision 22 passes through the PET fixed layer 9. The outer ring of the PET fixed layer 9 is made of opaque PET material, and the inner ring is LGP composed of light-guiding film and reflective film, and an LGF dot matrix 18 is arranged on the light-guiding film. The area of the LGF dot matrix 18 is larger than the luminous characters of the luminous area 7 by 2-4 mm. An LGF dot matrix 18 is arranged under each luminous area 7. The rice-shaped incision 22 is processed using a die cutter, and the packaging incision is flat and smooth, so that more light from the light guide column can enter the LGF The maximum point of the LGF dot matrix 18 is 0.1X0.1mm. The top surface of the circuit board 13 is provided with multiple springs 16, and each spring 16 is provided under each LGF dot matrix 18; the top surface of the middle spacer double-sided tape 10 is provided with multiple fourth cavities 23 and fifth cavities 24 adapted to the first cavity 19 and the second cavity 20; the top surface of the black liner 11 is provided with multiple equally distributed seventh cavities 26, and multiple equally distributed sixth cavities 25 are provided between every two seventh cavities 26; the top surface of the lower spacer double-sided tape 12 is respectively provided with multiple equally distributed eighth cavities 27 and ninth cavities 28.

[0027] A plurality of equally spaced support columns 14 are vertically fixed to the top surface of the circuit board 13, and a sleeve hole 15 is passed through the top surface of each material, and a support column 14 is axially slidably connected in each sleeve hole 15, and a groove 29 is vertically provided on the top surface of the support column 14, and the protrusion 5 is movably connected in the groove 29. Two mirror-symmetrical receiving grooves 30 are vertically provided on the top surface of the protrusion 5, and two mirror-symmetrical sliding grooves 31 are horizontally provided in each receiving groove 30, and a slider is slidably connected in each sliding groove 31. A spring 32 is horizontally fixed between the slider and the sliding groove 31, and a push plate 33 is fixed between the two sliders. The end of the push plate 33 is horizontally fixed with a positioning block 35, and the positioning block 35 axially slides through the receiving groove 30. The inner wall of the groove 29 is horizontally provided with two mirror-symmetrical positioning grooves 34, and a positioning block 35 is movably inserted in each positioning groove 34. A dial block 6 is fixed on the top surface of each push plate 33.

[0028] The present invention can realize backlighting of multiple keys 4 through the cooperation of LED lamps 17, light guides and LGF dot matrix 18 through structural design and circuit control, and the LED lamps 17 emit light stably with basically no brightness attenuation.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-button backlight panel, comprising a mask (1), characterized in that: An upper interlayer double-sided tape (8), a PET fixing layer (9), a middle interlayer double-sided tape (10), a black lining layer (11), a lower interlayer double-sided tape (12) and a circuit board (13) are sequentially provided below the mask (1); a first through groove (2) and a second through groove (3) are provided on the top surface of the mask (1); a luminous area (7) and a button (4) are provided in the first through groove (2) and the second through groove (3), respectively; a light-guiding column is provided on the circuit board (13) and is provided in the luminous area (7).

2. The multi-button backlight panel according to claim 1, characterized in that: The top surface of the upper spacer double-sided tape (8) passes through a plurality of equally distributed first cavities (19) and second cavities (20), and the first cavity (19) and the second cavity (20) located in the middle are connected to each other.

3. The multi-button backlight panel according to claim 2, characterized in that: The top surface of the PET fixed layer (9) is provided with a plurality of third cavities (21) which are equidistantly distributed and aligned with the second cavity (20); a rice-shaped cutout (22) is provided between each two of the third cavities (21); the rice-shaped cutout (22) passes through the PET fixed layer (9); the outer ring of the PET fixed layer (9) is made of opaque PET material; the inner ring is an LGP composed of a light-guiding film and a light-reflecting film; an LGF dot matrix (18) is provided on the light-guiding film; and one LGF dot matrix (18) is provided below each of the light-emitting areas (7).

4. The multi-button backlight panel according to claim 3, characterized in that: The top surface of the middle layer double-sided adhesive tape (10) is provided with a plurality of fourth cavities (23) and fifth cavities (24) adapted to the first cavity (19) and the second cavity (20); the top surface of the black lining layer (11) is provided with a plurality of seventh cavities (26) distributed at equal intervals; a plurality of sixth cavities (25) distributed at equal intervals are provided between every two seventh cavities (26); the top surface of the lower layer double-sided adhesive tape (12) is provided with a plurality of eighth cavities (27) and ninth cavities (28) distributed at equal intervals; the lower layer double-sided adhesive tape (12) is made of black opaque material, the top surface of the circuit board (13) is provided with a plurality of springs (16), each of which is provided below the LGF dot matrix (18), the top surface of the circuit board (13) is fixedly connected to a plurality of equally spaced LED lights (17), the height of the LED lights (17) is less than the thickness of the lower spacer double-sided tape (12), the top surface of each LED light (17) abuts against one of the light guide columns, the light guide columns are made of highly light-transmitting material, and aluminum foil is wrapped around the outside of the light guide columns.

5. The multi-button backlight panel according to claim 1, characterized in that: A plurality of equally spaced support columns (14) are vertically fixed on the top surface of the circuit board (13), and a sleeve hole (15) is passed through the top surface of each material. A support column (14) is axially slidably inserted into each sleeve hole (15), and a groove (29) is vertically provided on the top surface of the support column (14), and a movably connected protrusion (5) is provided in the groove (29).

6. The multi-button backlight panel according to claim 5, characterized in that: Two mirror-symmetrical receiving grooves (30) are vertically opened on the top surface of the protrusion (5), and two mirror-symmetrical sliding grooves (31) are horizontally opened in each of the receiving grooves (30). A slider is slidably connected in each of the sliding grooves (31). A spring (32) is horizontally fixed between the slider and the sliding groove (31). A push plate (33) is fixed between the two sliders. A positioning block (35) is horizontally fixed at the end of the push plate (33). The positioning block (35) slides axially through the receiving groove (30). Two mirror-symmetrical positioning grooves (34) are horizontally opened on the inner wall of the groove (29). A positioning block (35) is movably inserted in each of the positioning grooves (34). A shift block (6) is fixed on the top surface of each push plate (33).

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