CN215266023U - PCBA-based backlight key - Google Patents

Abstract

The utility model discloses a button in a poor light based on PCBA, including key cap, elastic element, scissors foot, PCBA board and backlight unit, backlight unit includes light source and light guide plate, in leaded light hole or the light guide groove on the light guide plate was located to the light source, PCBA board top was located to the light guide plate. Compare in prior art's backlight unit, the utility model discloses a when the button has and is shaded, whole thickness is little, and display effect is excellent, can be used to the frivolous design of keyboard and notebook. The utility model discloses utilize the integrated configuration of light guide plate and PCBA rigid wiring board to replace the bottom plate, have the support intensity of bottom plate promptly, also play the effect of leaded light etc. and further reduced the thickness of keyboard.

Description

PCBA-based backlight key

Technical Field

The utility model relates to a button is shaded especially relates to a button is shaded based on PCBA.

Background

Printed Circuit Boards (PCBs) are important electronic components, support for electronic components, and providers of circuit connections for electronic components, and are manufactured by electronic printing techniques. A Printed Circuit Board Assembly (PCBA) is a Circuit Board formed by an empty PCB through an SMT process or a DIP process. The existing key with the backlight module is thick, and the requirements of display effect and light weight and thinness cannot be met.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a button is shaded based on PCBA frivolousization, high strength.

The technical scheme is as follows: the utility model discloses a button in a poor light based on PCBA, including key cap, elastic element, scissors foot, PCBA board and backlight unit, its characterized in that, backlight unit includes light source and light guide plate, in leaded light hole or the light guide groove on the light guide plate was located to the light source, PCBA board top was located to the light guide plate.

The light guide plate is provided with a clamping hook, and the clamping hook is connected with the scissor feet.

And a flexible circuit board is arranged above the light guide plate.

The PCBA board is arranged below the backlight module, and the circuit of the keys is integrated on the PCBA board.

The light source is embedded in the light guide plate.

And a reflective film is arranged on the lower surface of the light guide plate.

The light source is arranged on one side of the key.

The clamping hook and the light guide plate are integrally formed.

The clamping hook is fixed with the light guide in a hot melting or in-mold forming mode.

The trip runs through light guide plate and PCBA board, and the trip bottom is equipped with the chimb, locates PCBA board below beneficial effect: compared with the prior art, the utility model has the advantages of it is as follows showing:

compare in prior art's backlight unit, the utility model discloses a when the button has and is shaded, whole thickness is little, and display effect is excellent, can be used to the frivolous design of keyboard and notebook. The utility model discloses utilize the integrated configuration of light guide plate and PCBA rigid wiring board to replace the bottom plate, have the support intensity of bottom plate promptly, also play the effect of leaded light etc. and further reduced the thickness of keyboard.

Drawings

FIG. 1 is a schematic diagram of a prior art structure;

fig. 2 is a schematic structural diagram of an embodiment of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

fig. 4 is a schematic structural diagram of another embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

Fig. 1 shows a conventional key structure with a backlight module, which includes a key cap 1, an elastic element 2 under the key cap, scissors 3 connecting the key cap and a bottom plate 10, a flexible circuit board 4 above the bottom plate 10, and a backlight unit 6. Be equipped with trip 51 on the bottom plate 10, trip 51 is used for fixed scissors foot 3, and trip 51 includes fixing base and sliding seat, and fixing base and the 3 terminal fixed connection of scissors foot, sliding seat fix on bottom plate 10, and the sliding seat has the spout for the end of scissors foot 3 slides in the sliding seat. The backlight unit 6 of the conventional structure is disposed under the base plate 10, and includes a light guide plate 61 having a size corresponding to that of the base plate 10, a backlight unit circuit 62, and an LED light source 63. The LED light source 63 is embedded in the light guide plate and is located at one side or the middle of the key. The light source of the backlight unit 6 needs to be entirely embedded in the light guide plate, so that the thickness of the light guide plate is increased. Other prior art sets up light guide plate and light source layering, has increased backlight unit's thickness more, is unfavorable for the frivolous design of notebook or keyboard.

In an embodiment of the present invention, as shown in fig. 2 to 3, the key cap 1 and other structures are the same as those of the prior art, and in this embodiment, the backlight module 7 includes a light guide plate 5, a light source 72 and a reflective film 71. In this embodiment, the light guide plate 5 of the backlight module is combined with the PCBA board 8 of the key to replace the original bottom board structure, and the light guide plate 5 is made of Polycarbonate (PC) or the like, and has a certain strength and light guide characteristics. The light source 72 of the backlight module 7 is disposed in the light guide hole or the light guide groove of the light guide plate 5, so that the light source 72 is located in the light guide hole or the light guide groove. The depth of the light source 72 embedded in the light guide plate 5, the thickness of the light source 72 embedded in the reflective film 71, the thickness of the reflective film 71, and the like can be adjusted according to the brightness required by the key. Compare in prior art, the light guide plate thickness is less in this embodiment, has reduced 2 ~ 5mm of whole button thickness.

In this embodiment, a PCBA board is disposed below the backlight module 7 for integrating the circuit of the backlight module. The reflective film 71 is disposed below the light guide plate 5 (i.e., on the surface near the PCBA), so as to better collect light emitted from the light source and improve the display brightness.

In this embodiment, the flexible printed circuit 4 is disposed above the light guide plate 5, and a circuit required for key operation is disposed in the flexible printed circuit. The flexible circuit board 4 and the elastic element 2 complete the press touch of the key, and may be a capacitive type or a traditional contact type.

The light guide plate 5 is provided with a hook 51 for fixing the scissor legs of the keys, and the hook 51 and the light guide plate 5 are integrally formed. In other embodiments, the hook 51 may be fixed to the light guide plate by heat melting or in-mold injection. The trip 51 runs through light guide plate 5 and PCBA board 8, and trip 51 bottom is equipped with the chimb, locates the PCBA below, can fix this trip better.

As shown in fig. 4, in another embodiment of the present invention, the flexible printed circuit board design of the existing structure can be eliminated, and the circuit of the keyboard and the circuit of the backlight module are integrated into the PCBA board 8 below the backlight module 7. If the contact type is a key contact type, a through hole 9 is formed in the light guide plate 5 for contacting the elastic element 2 with the lower circuit. If the key is a capacitive key, a through hole is not required to be formed. The improvement of the structure further reduces the whole thickness of the key, and reduces the thickness by at least 5mm on the basis of the previous embodiment. The other structures of this embodiment are the same as those of the previous embodiment.

Claims (10)

1. The utility model provides a button in a poor light based on PCBA, includes key cap, elastic element, scissors foot, PCBA board and backlight unit, its characterized in that, backlight unit includes light source and light guide plate, in leaded light hole or the light guide groove on the light guide plate was located to the light source, PCBA board top was located to the light guide plate.

2. The PCBA-based backlight key as recited in claim 1, wherein the light guide plate is provided with hooks, and the hooks are connected with the scissor legs.

3. The PCBA-based backlight key as recited in claim 1, wherein a flexible circuit board is disposed above the light guide plate.

4. The PCBA-based backlight key as recited in claim 1, wherein the PCBA board is disposed below the backlight module, and the circuit of the key is integrated on the PCBA board.

5. The PCBA-based backlight key as recited in claim 1, wherein the light source is embedded in the light guide plate.

6. The PCBA-based backlight key as recited in claim 1, wherein the lower surface of the light guide plate is provided with a reflective film.

7. The PCBA-based backlight key as recited in claim 1, wherein the light source is disposed on one side of the key.

8. The PCBA-based backlight key as recited in claim 2, wherein the hook is integrally formed with the light guide plate.

9. The PCBA-based backlight key as recited in claim 2, wherein the hook is fixed with the light guide plate by means of hot melting or in-mold molding.

10. The PCBA-based backlight key as recited in claim 9, wherein the hook penetrates through the light guide plate and the PCBA, and a convex edge is provided at the bottom of the hook and is disposed below the PCBA.

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