High light transmittance keyboard circuit

Abstract

This utility model discloses a high-transmittance keyboard circuit, including keycaps, a thin film layer disposed below the keycaps, and a light-emitting component disposed below the thin film layer. The thin film layer includes a middle PET layer with through holes, an upper PET layer disposed above the middle PET layer, a lower PET layer disposed below the middle PET layer, upper layer circuits printed on the lower end face of the upper PET layer, and lower layer circuits printed on the upper end face of the lower PET layer. The upper layer circuit includes a first line and a first mesh circuit connected to the first line and located above the through holes. The lower layer circuit includes a second line and a second mesh circuit connected to the second line and located below the through holes. The first and second mesh circuits are interleaved to form a plurality of first light-transmitting holes. Advantages: When the light emitted by the light-emitting component shines on one side of the keycap, the thin film layer corresponding to the keycap, due to the hollow design of the first light-transmitting holes, allows the light to pass directly through the first light-transmitting holes and illuminate the keycap, resulting in a better light-emitting effect.

Description

Technical Field

[0001] This utility model relates to the field of keyboard circuits, specifically a high-transmittance keyboard circuit. Background Technology

[0002] An illuminated keyboard refers to a keyboard where, after the computer is powered on, the light emitted by the internal LEDs shines directly upwards, passing through the gaps between the keycaps and illuminating the characters on the keycaps and the gaps between them. Alternatively, the light from the LEDs can be converted into a surface light source by a light guide plate and then diffused upwards, illuminating the characters on the keycaps and the gaps between them. Existing keyboard circuitry includes a membrane switch beneath the keycaps. The membrane switch consists of three layers of PET substrate, with through-holes corresponding to the keycaps in the middle layer. The upper and lower layers of the PET substrate are printed with upper and lower silver paste circuitry, respectively. Pressing a keycap forces the upper silver paste circuitry down through the through-holes and connects with the lower silver paste circuitry, thus enabling the keycap to function. However, in traditional keyboards, the upper and lower silver paste circuitry corresponding to the through-holes are solid silver paste, which blocks the light from below, resulting in poor keycap illumination.

[0003] Therefore, it is necessary to provide a high-transmittance keyboard circuit. Utility Model Content

[0004] This invention provides a high-transmittance keyboard circuit, which effectively solves the problem of poor lighting effect in existing backlit keyboards.

[0005] The technical solution adopted in this utility model is:

[0006] A high-transmittance keyboard circuit includes keycaps, a thin film layer disposed below the keycaps, and a light-emitting component disposed below the thin film layer. The thin film layer includes a middle PET layer with through holes, an upper PET layer disposed above the middle PET layer, a lower PET layer disposed below the middle PET layer, upper layer circuits printed on the lower end face of the upper PET layer, and lower layer circuits printed on the upper end face of the lower PET layer. The upper layer circuit includes a first line and a first mesh circuit connected to the first line and located above the through holes. The lower layer circuit includes a second line and a second mesh circuit connected to the second line and located below the through holes. The first and second mesh circuits are interleaved to form a plurality of first light-transmitting holes.

[0007] Furthermore, the light-emitting component includes an aluminum plate, a light-shielding sheet disposed below the aluminum plate, a light guide plate disposed below the light-shielding sheet, a plurality of LEDs disposed below the light guide plate, a reflector disposed below the LEDs, and an FPC disposed below the reflector. The FPC is connected to the LEDs. The light-shielding sheet has a second light-transmitting hole corresponding to each key point. The aluminum plate has a first hole corresponding to each key point, and the light-shielding sheet has a second hole corresponding to the first hole.

[0008] Furthermore, the reflector is provided with a number of No. 1 positioning holes, and the light guide plate is provided with a number of No. 2 positioning holes that correspond one-to-one with the No. 1 positioning holes.

[0009] Furthermore, the reflector is provided with a number of first mounting holes, and the light guide plate is provided with a number of second mounting holes that correspond one-to-one with the first mounting holes.

[0010] Furthermore, the light-transmitting hole is a rectangular hole.

[0011] Furthermore, the No. 1 mesh line includes a busbar A connected to the No. 1 line and several branch lines A arranged horizontally and vertically on both sides of the busbar A. The No. 2 mesh line includes a busbar B connected to the No. 2 line and several branch lines B arranged horizontally and vertically on both sides of the busbar A. The busbar A is parallel to the branch lines B, the busbar B is parallel to the branch lines A, the busbar A coincides with one of the branch lines B, and the busbar B coincides with one of the branch lines A.

[0012] Furthermore, the thickness of the light-shielding sheet is less than 1 mm.

[0013] The beneficial effects of the utility model: When the light emitted by the light-emitting component shines on one side of the keycap, the light can pass directly through the first light-transmitting hole in the thin film layer corresponding to the keycap due to the hollow design of the first light-transmitting hole, so that the light source can shine onto the keycap, making the keycap light-emitting effect better. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the high-transmittance keyboard circuitry provided in an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the No. 1 and No. 2 mesh lines of the high-transmittance keyboard circuit provided in the embodiments of this application.

[0016] The diagram is labeled as follows: 1. Keycap; 2. Thin film layer; 3. Aluminum plate; 4. Light shield; 5. Light guide plate; 6. Reflective sheet; 7. FPC; 21. Line 1; 22. Line 2; 23. Busbar A; 24. Branch line A; 25. Busbar B; 26. Branch line B. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, an embodiment of this application provides a high-transmittance keyboard circuit, including a keycap 1, a thin film layer 2 disposed below the keycap 1, and a light-emitting component disposed below the thin film layer 2. The thin film layer 2 includes a middle PET layer with through holes, an upper PET layer disposed above the middle PET layer, a lower PET layer disposed below the middle PET layer, upper layer circuits printed on the lower end face of the upper PET layer, and lower layer circuits printed on the upper end face of the lower PET layer. The upper layer circuits include a first line 21 and a first mesh circuit that is connected to the first line 21 and located above the through holes. The lower layer circuits include a second line 22 and a second mesh circuit that is connected to the second line 22 and located below the through holes. The first mesh circuits and the second mesh circuits are interleaved to form a plurality of first light-transmitting holes.

[0019] In practical use, the high-transmittance keyboard circuitry of this application is applied to the keyboard. When keycap 1 is pressed, the key point under keycap 1 is pressed through the through hole and the second mesh circuitry via the first mesh circuitry. When keycap 1 is released, the elasticity of the upper PET layer causes the first and second mesh circuitry under keycap 1 to disconnect. When the computer is powered on, the light-emitting component emits light through the thin film layer 2 and the first light-transmitting hole, causing keycap 1 to emit a faint light.

[0020] In the above design, when the light emitted by the light-emitting component shines on one side of the keycap 1, the light in the thin film layer 2 corresponding to the keycap 1 can directly pass through the first light-transmitting hole and shine the light source onto the keycap 1, making the light-emitting effect of the keycap 1 better.

[0021] Specifically: such as Figure 1 As shown, the light-emitting component includes an aluminum plate 3, a light-shielding sheet 4 below the aluminum plate 3, a light guide plate 5 below the light-shielding sheet 4, several LEDs below the light guide plate 5, a reflector 6 below the LEDs, and an FPC 7 below the reflector 6. The FPC 7 is electrically connected to the LEDs. The light-shielding sheet 4 has a second light-transmitting hole corresponding to each key point. The aluminum plate 3 has a first hole corresponding to each key point, and the light-shielding sheet 4 has a second hole corresponding to the first hole. It should be noted that the FPC 7 is electrically connected to the keyboard's PCB motherboard. The aluminum plate 3 mainly serves a supporting function.

[0022] When the computer is powered on, the LED light emits a light source through the cooperation of the reflector 6 and the light guide plate 5. The light source shines on the light guide plate 5 and is reflected by the light guide plate 5. Then, under the action of the reflector 6, the light guide plate 5 shines upward through the first hole and the second hole, so that the gap between the keycaps 1 and the characters on the keycaps 1 are illuminated.

[0023] In the above design, by setting the light guide plate 5 and the reflector 6, uniform light dispersion can be achieved, making the light projected onto the keycap 1 softer and more uniform. The light shield 4 can block the areas between connected keycaps 1 that do not need to emit light, and the light is transmitted only through the second hole of the light shield 4.

[0024] Specifically: the reflective sheet 6 is provided with a plurality of first positioning holes, and the light guide plate 5 is provided with a plurality of second positioning holes that correspond one-to-one with the first positioning holes.

[0025] It should be noted that the keyboard casing is equipped with positioning posts, which are used to position the high-transmittance keyboard circuitry of this application.

[0026] In actual use, the keyboard housing uses positioning pins to pass through positioning holes one and two to position the reflector 6 and the light guide plate 5.

[0027] In the above design, the design of positioning hole 1 and positioning hole 2 facilitates the positioning of reflector 6 and light guide plate 5 during keyboard assembly.

[0028] Specifically: the reflective sheet 6 is provided with a plurality of first mounting holes, and the light guide plate 5 is provided with a plurality of second mounting holes corresponding one-to-one with the first mounting holes.

[0029] During actual assembly, the keyboard casing is secured to the nut by bolts passing through mounting holes number one and number two.

[0030] In the above design, the structural design and specific implementation of mounting holes No. 1 and No. 2 can effectively fix the reflector 6 and the light guide plate 5.

[0031] Specifically, the light-transmitting hole is a rectangular hole.

[0032] In actual use, after the computer is turned on, the light inside the keyboard can be emitted along the rectangular hole towards one side of the keycap 1.

[0033] In the above design, the shape of the light-transmitting hole is achieved by making the angle between the No. 1 mesh line and the No. 2 mesh line 90°, which facilitates the wiring of the No. 1 mesh line and the No. 2 mesh line.

[0034] Specifically: such as Figure 2As shown, the No. 1 mesh line includes a busbar A23 connected to the No. 1 line 21 and several branch lines A24 arranged horizontally and vertically on both sides of the busbar A23. The No. 2 mesh line includes a busbar B25 connected to the No. 2 line 22 and several branch lines B26 arranged horizontally and vertically on both sides of the busbar A23. The busbar A23 is parallel to the branch line B26, the busbar B25 is parallel to the branch line A24, the busbar A23 coincides with one of the branch lines B26, and the busbar B25 coincides with one of the branch lines A24.

[0035] When the key is actually pressed, the No. 1 mesh line is pressed down and connected to the No. 2 mesh line: making bus A23 coincide with one of the branch lines B26 and connected, bus B25 coincide with one of the branch lines A24 and connected, and the remaining branch lines A24 and B26 are connected.

[0036] In the above design, a light-transmitting hole is formed between busbar A23, busbar B25, branch line A24 and branch line B26, which can ensure the conduction of the first mesh line and the second mesh line, and also ensure that the light is transmitted along the first light-transmitting hole towards the keycap 1.

[0037] Specifically, the thickness of the light-shielding sheet 4 is less than 1 mm.

[0038] In the above design, the thickness of the light-shielding sheet 4 can meet the requirements for product thinness.

[0039] In further detail, it should be understood that the above description is only a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high light transmittance keyboard circuit, comprising a key cap (1), a film layer (2) arranged below the key cap (1), a light emitting component arranged below the film layer (2), the film layer (2) comprising a middle layer PET provided with a through hole, an upper layer PET arranged above the middle layer PET, a lower layer PET arranged below the middle layer PET, an upper layer circuit printed on the lower end face of the upper layer PET, and a lower layer circuit printed on the upper end face of the lower layer PET, characterized in that: The upper layer circuit includes a first line (21) and a first mesh line that is connected to the first line (21) and located above the through hole. The lower layer circuit includes a second line (22) and a second mesh line that is connected to the second line (22) and located below the through hole. The first mesh line and the second mesh line are interleaved to form a plurality of first light-transmitting holes.

2. The high light transmittance keyboard circuit according to claim 1, characterized in that: The light-emitting component includes an aluminum plate (3), a light-shielding sheet (4) below the aluminum plate (3), a light guide plate (5) below the light-shielding sheet (4), a plurality of LEDs below the light guide plate (5), a reflector (6) below the LEDs, and an FPC (7) below the reflector (6). The FPC (7) is connected to the LEDs. The light-shielding sheet (4) has a second light-transmitting hole corresponding to the key point. The aluminum plate (3) has a first hole corresponding to the key point, and the light-shielding sheet (4) has a second hole corresponding to the first hole.

3. The high light transmittance keyboard circuit according to claim 2, characterized in that: The reflective sheet (6) is provided with a number of No. 1 positioning holes, and the light guide plate (5) is provided with a number of No. 2 positioning holes that correspond one-to-one with the No. 1 positioning holes.

4. The high light transmittance keyboard circuit according to claim 2, characterized in that: The reflective sheet (6) is provided with a number of first mounting holes, and the light guide plate (5) is provided with a number of second mounting holes that correspond one-to-one with the first mounting holes.

5. The high light transmittance keyboard circuit according to claim 1, characterized in that: The light-transmitting hole is a rectangular hole.

6. The high light transmittance keyboard circuit according to claim 1, characterized in that: The first mesh line includes a busbar A (23) connected to the first line (21) and several branch lines A (24) arranged horizontally and vertically on both sides of the busbar A (23). The second mesh line includes a busbar B (25) connected to the second line (22) and several branch lines B (26) arranged horizontally and vertically on both sides of the busbar A (23). The busbar A (23) is parallel to the branch line B (26), the busbar B (25) is parallel to the branch line A (24), the busbar A (23) coincides with one of the branch lines B (26), and the busbar B (25) coincides with one of the branch lines A (24).

7. The high light transmittance keyboard circuit according to claim 2, characterized in that: The thickness of the light-shielding sheet (4) is less than 1 mm.

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