TWM549953U - Keyboard and backlight module thereof - Google Patents

Description

Keyboard and backlight module

This creation is about a keyboard, especially a backlight module for a keyboard.

In terms of current computer usage habits, the keyboard is one of the indispensable input devices. Whether it is the computer itself or its peripheral products, it is developing towards a light, thin, short and small design concept. The keyboard has also changed from an early large architecture to a thin keyboard. In addition, an illuminated keyboard is also currently available on the market, generally in the interior of the keyboard, such as a light-emitting diode (LED), and transmitted by the periphery or key surface of the button for use. The position of each button can still be clearly distinguished in the dark.

Moreover, the structure of the illuminated keyboard is such that a backlight module is disposed at the bottom of the plurality of buttons, and includes a light shielding layer, a light guiding layer, a reflective layer, and the like, and is sequentially assembled to the bottom of the button. The light shielding layer has a plurality of light transmitting portions respectively corresponding to the buttons, and the light emitting module is disposed on the light guiding layer. The light is guided by the light guiding layer to the bottom of the entire keyboard, and is reflected upward by the reflective layer, and then the light is collected at the position of each button through the light shielding layer, thereby transmitting light on the key surface or the periphery of the button.

However, the conventional backlight module has a laminated structure, and the light shielding layer, the light guiding layer and the reflective layer are all open type, so they are easily affected by external moisture. For example, moisture may cause the adhesive for bonding the light shielding layer and the light guiding layer to loosen, and the light guiding layer is more likely to be deformed by bending, warping or the like due to moisture, thereby causing the backlight module and the keyboard. The decline in service life is necessary for improvement.

In view of the above problems, the main purpose of the present invention is to provide a keyboard and a backlight module thereof, and the structure of the conventional backlight module is easily affected by moisture and water by the design of the waterproof member and the reflective layer, thereby causing backlighting. The problem of reduced life of modules and keyboards.

To achieve the above object, the present invention provides a keyboard including a bottom plate, a thin film circuit board, a plurality of key assemblies, and a backlight module. The bottom plate has a relatively upper surface and a lower surface. The thin film circuit board is disposed on the upper surface of the bottom plate. The button assemblies are disposed on an upper surface of the bottom plate. The backlight module includes a light shielding layer, a light guiding layer, a reflective layer and a waterproof member. The light shielding layer is disposed on the lower surface of the bottom plate. The light guiding layer is disposed below the light shielding layer. The reflective layer is disposed below the light guiding layer. One side of the waterproof member is connected to the reflective layer, and the other side is disposed below the bottom plate, and the waterproof member and the reflective layer together form a closed space, and the light guiding layer is accommodated in the closed space.

In order to achieve the above object, the present invention further provides a backlight module which is disposed on a lower surface of a bottom plate of a keyboard. The backlight module includes a light shielding layer, a light guiding layer, a reflective layer and a waterproof member. The light shielding layer is disposed on the lower surface of the bottom plate. The light guiding layer is disposed below the light shielding layer. The reflective layer is disposed below the light guiding layer. One side of the waterproof member is connected to the reflective layer, and the other side is disposed below the bottom plate, and the waterproof member and the reflective layer together form a closed space, and the light guiding layer is accommodated in the closed space.

According to an embodiment of the present invention, the light guiding layer has at least three light blocking structures disposed on a periphery of the light guiding layer.

According to an embodiment of the present invention, the light blocking structures are formed by laser processing.

According to an embodiment of the present invention, the light blocking structures are linear and arranged in sequence on the periphery of the light guiding layer.

According to an embodiment of the present creation, the waterproof member is a light transmissive material.

According to an embodiment of the present invention, the reflective layer further has a white coating on an inner surface of the reflective layer.

According to an embodiment of the present invention, the reflective layer further has a dark coating on an outer surface of the reflective layer.

According to an embodiment of the present invention, the other side of the waterproof member is fixed to the lower surface of the bottom plate.

According to an embodiment of the present invention, the light shielding layer extends to the periphery of the bottom plate, and the other side of the waterproof member is fixed below the light shielding layer.

According to an embodiment of the present invention, the light shielding layer is located between the bottom plate and the waterproof member.

According to the above, the backlight module is disposed on the lower surface of the bottom plate of the keyboard, and the backlight module includes a light shielding layer, a light guiding layer, a reflective layer and a waterproof member. The light shielding layer, the light guiding layer and the reflective layer are sequentially disposed below the bottom plate. One side of the waterproof member is connected to the reflective layer, and the other side is disposed below the bottom plate, and the waterproof member and the reflective layer together form a closed space, so that the light guiding layer can be accommodated in the closed space, which can avoid the light guiding layer If there is deformation such as bending or warping due to contact with moisture, the effect of extending the service life of the backlight module and the keyboard can be achieved.

In order to enable your review board to better understand the technical content of this creation, the preferred embodiments are described below.

1 is a schematic view of a keyboard according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the line A-A shown in FIG. 1, please refer to FIG. 1 and FIG. 2 at the same time. The keyboard 1 of the embodiment includes a bottom plate 10, a thin film circuit board 20, a plurality of key assemblies 30, and a backlight module 40. The bottom plate 10 has a pair of upper surface 11 and a lower surface 12. The button assembly 30 is disposed on the upper surface 11 of the bottom plate 10 and can move up and down corresponding to the bottom plate 10. In other words, in the present embodiment, the side surface on which the bottom plate 10 is provided with the key assembly 30 is referred to as the upper surface 11, and the surface on the opposite side of the upper surface 11 is referred to as the lower surface 12. Further, the following also refers to the direction toward the button assembly 30 as the upper side, and the reverse direction is referred to as the lower side. The thin film circuit board 20 is also disposed on the upper surface 11 of the bottom plate 10. The key assembly 30 of the embodiment includes a key cap 31, a scissor connector 32 and an elastic body (not shown), and the elastic body is disposed on the thin film circuit board. 20 is between the keycap 31. When the user presses the keycap 31, the scissors cap 32 and the elastic body are used to move the keycap 31 up and down, and when the elastic body contacts the thin film circuit board 20, corresponding characters or symbols can be input.

In addition, the bottom plate 10 further has a plurality of openings 13 configured in a manner corresponding to the position of the button assembly 30, so that the light emitted by the backlight module 40 can pass through the opening 13 to transmit the periphery of the keycap 31 or its key surface. Light. The technical feature of the present invention is that the backlight module 40 is disposed on the lower surface 12 of the bottom plate 10. Therefore, regarding the detailed connection relationship and operation of the thin film circuit board 20 and the button assembly 30, the conventional button assembly and the thin film circuit board can be used. I will not repeat them here.

In this embodiment, the backlight module 40 includes a light shielding layer 41 , a light guiding layer 42 , a reflective layer 43 , and a waterproof member 44 . The light shielding layer 41, the light guiding layer 42 and the reflective layer 43 are sequentially assembled under the bottom plate 10. Specifically, the light shielding layer 41 is disposed on the lower surface 11 of the bottom plate 10, and the light guiding layer 42 is disposed below the light shielding layer 41. The reflective layer 43 is disposed below the light guiding layer 42. Moreover, the light shielding layer 41 of the present embodiment has a plurality of light transmitting portions 411 corresponding to the openings 13 of the bottom plate 10, so that the light emitted by the backlight module 40 can be concentrated on the light transmitting portion 411, first through the light transmitting portion. After 411, it passes through the opening 13 of the bottom plate 10. The light transmitting portion 411 may be a light transmissive material or a hole structure. The present invention is not limited, and only the effect of passing light through the light transmitting portion 411 is achieved.

The light guiding layer 42 of the embodiment is bonded to the lower surface of the light shielding layer 41, and the light emitting module (not shown) of the backlight module 40 is disposed on the light guiding layer 42 and the light emitting layer is used by the light guiding layer 42. The light emitted by the group is uniformly guided to the entire light guiding layer 42. Specifically, the light emitting module is generally disposed in a central region of the light guiding layer 42 or on one side thereof, and the light is uniformly guided to the entire surface by the light guiding layer 42. In addition, in order to prevent the light guided by the light guiding layer 42 from leaking outward from the side of the light guiding layer 42 to cause light leakage, preferably, the light guiding layer 42 of the embodiment has at least three light blocking structures. 421 is disposed adjacent to a periphery of the light guiding layer 42.

Please refer to FIG. 3, which is a partial plan view of the light guiding layer shown in FIG. 2. Specifically, the light guiding layer 42 of the embodiment may be made of a plastic material such as polycarbonate (PC) or polymethyl methacrylate (PMMA), and is guided by a laser processing method to the light guiding layer 42. The peripheral edge of the side forms a light blocking structure 421. In detail, an appropriate range of laser output wavelengths may be selected according to the difference in material of the light guiding layer 42, which may be, for example but not limited to, between 1150 nm and 1250 nm, or between 1350 nm and 1400 nm. Or a wavelength range between 1550 nm and 1650 nm. The laser wavelength outputted in this embodiment ranges from 1550 nm to 1650 nm, and the laser energy is accumulated on the periphery of the light guiding layer 42 to form a light blocking structure 421 of a carbonized or crystalline state. In other words, the light-blocking structure 421 of the present embodiment is formed by laser processing, and the light-blocking structure 421 is formed on the periphery of the light guiding layer 42 by laser ablation. The light blocking structure 421 has a function of blocking light, which can prevent the light guided by the light guiding layer 42 from leaking outward from the side.

Moreover, the light blocking structure 421 of the present embodiment is linear and has at least three light blocking structures 421 arranged in sequence on the periphery of the light guiding layer 42. The innermost light blocking structure 421 can absorb 60% to 70% of the light, the middle light blocking structure 421 can absorb 20% to 30% of the light, and the outermost light blocking structure 421 can absorb the remaining light. The three-line type light blocking structure 421 can effectively prevent the light guided by the light guiding layer 42 from leaking outward, so that the light emitted by the light emitting module can be efficiently transmitted to the light shielding layer 41 to ensure the surface of the key cap 31. The effect of light transmission can further clearly indicate various symbols or symbols on the surface of each keycap 31.

Moreover, it is conventional to apply a light absorbing ink to the periphery of the light guiding layer 42 or to form a wide strip light blocking structure by laser processing. However, the light-blocking ink has a poor light-blocking effect, and the laser-processed side forms a band-shaped light-blocking structure, which simultaneously causes the peripheral edge of the light guiding layer 42 to curl or warp. In this embodiment, at least three linear light blocking structures 421 are formed on the periphery of the light guiding layer 42 , and the light blocking effect is superior to the light absorbing ink, and the peripheral edge of the light guiding layer 42 is not curled or warped. Ribbon blocking structure.

As shown in FIG. 2, one side of the waterproof member 44 of the present embodiment is connected to the reflective layer 43, and the other side is disposed below the bottom plate 10. This embodiment is fixed to the lower surface 12 of the bottom plate 10. Specifically, in this embodiment, the side of the waterproof member 44 near the central portion of the bottom plate 10 is referred to as the inner side, and the opposite side is referred to as the outer side. The inner side of the waterproof member 44 extends from the four sides of the reflective layer 43, and the outer side is fixed to the lower surface 11 of the bottom plate 10 and is located at the periphery of the bottom plate 10. Therefore, the waterproof member 44 and the reflective layer 43 can form the closed space 50 together, and the light shielding layer 41 and the light guiding layer 42 are accommodated in the closed space 50, thereby preventing the external moisture from affecting the light shielding layer 41 and the light guiding layer 42. In order to improve the service life of the backlight module 40 and the keyboard 1. Moreover, since the light guiding layer 42 of the present embodiment has a design of the light blocking structure 421 to prevent light from leaking from the side of the light guiding layer 42, the material of the waterproof member 44 is not limited, and the waterproof member 44 of the embodiment is Light transmissive material.

In addition, in the present embodiment, the reflective layer 43 corresponds to the closed space 50, that is, the surface near the light guiding layer 42 is referred to as an inner surface, and the surface on the opposite side is referred to as an outer surface. Further, the reflective layer 43 has a white coating 431 which is located on the inner surface of the reflective layer 43. In this embodiment, a white paint is printed on the inner surface of the reflective layer 43 to form a white coating 431 for reflecting the light emitted from the light guiding layer 42, thereby guiding the light to the light shielding layer 41.

The light blocking structure 421 of the light guiding layer 42 of the embodiment can prevent light from leaking from the side of the light guiding layer 42 , and the inner surface of the reflective layer 43 has a white coating 431 to reflect the light emitted from the light guiding layer 42 . Light, so the outer surface of the reflective layer 43 can be printed or coated with a coating of any color. Preferably, the reflective layer 43 of the present embodiment further has a dark coating 432 located on the outer surface of the reflective layer 43. That is, a dark paint is printed on the outer surface of the reflective layer 43, which may be, for example, a black, ochre, or other dark paint to absorb light that is not reflected by the white coating 431 to avoid light from the reflective layer 43. leakage.

In practice, a polyethylene terephthalate sheet (hereinafter referred to as a PET sheet) is first taken, and the PET sheet is a light-transmitting material. Next, a white paint is printed on a central portion of one of the surfaces of the PET sheet to form a white coating 431, and a dark coating is printed on a central portion of the other surface to form a dark coating 432. The central area corresponds to the light guiding layer 42, that is, the areas of the white coating 431 and the dark coating 432 are substantially equal to the area of one surface of the light guiding layer 42. A portion of the PET sheet having a white paint or a black paint is used as the reflective layer 43 of the present embodiment. The portion of the PET sheet that is not printed with a white paint or a black paint can be directly used as the waterproof member 44 of the present embodiment to form A structure in which one side of the waterproof member 44 extends from the reflective layer 43. The other side of the waterproof member 44 is fixed to the lower surface 12 of the bottom plate 10 to form a closed space 50 together with the reflective layer 43 , thereby accommodating the light shielding layer 41 and the light guiding layer 42 . In other embodiments, the white coating 431 and the dark coating 432 may alternatively be used, and the creation is not limited.

In addition, the present creation does not limit that the light shielding layer 41 must be located in the enclosed space 50. 4 is a cross-sectional view of a keyboard of another embodiment of the present invention, which is shown in FIG. 4. In the present embodiment, the light shielding layer 41a extends to the periphery of the bottom plate 10, and one side (inner side) of the waterproof member 44a is also connected to the reflective layer 43a, and the other side (outer side) is fixed to the light shielding. Below the layer 41a, a state in which the light shielding layer 41a is located between the bottom plate 10 and the waterproof member 44a is formed. In this embodiment, the reflective layer 43a and the waterproof member 44a also form a closed space 50a, and the light guiding layer 42a is also located in the closed space 50a, which can prevent the light guiding layer 42a from being bent and warped due to contact with moisture. In the case of deformation, the purpose of extending the service life of the backlight module 40a can be achieved.

In addition, the present invention further provides a backlight module disposed on a lower surface of a bottom plate of the keyboard. The backlight module includes a light shielding layer, a light guiding layer, a reflective layer, and a waterproof member. For the structure of each component and the connection relationship thereof, reference may be made to the backlight module 40, 40a of the foregoing embodiment, and details are not described herein. .

In summary, according to the keyboard and the backlight module thereof, the backlight module is disposed on the lower surface of the bottom plate of the keyboard, and the backlight module comprises a light shielding layer, a light guiding layer, a reflective layer and a waterproof member. The light shielding layer, the light guiding layer and the reflective layer are sequentially disposed below the bottom plate. One side of the waterproof member is connected to the reflective layer, and the other side is disposed below the bottom plate, and the waterproof member and the reflective layer together form a closed space, so that the light guiding layer can be accommodated in the closed space, which can avoid the light guiding layer If there is deformation such as bending or warping due to contact with moisture, the effect of extending the service life of the backlight module and the keyboard can be achieved.

It is to be noted that the above-described embodiments are exemplified for the convenience of the description, and the scope of the claims is intended to be limited to the above-mentioned embodiments.

1‧‧‧ keyboard
10‧‧‧floor
11‧‧‧ upper surface
12‧‧‧ surface
13‧‧‧Opening
20‧‧‧Film board
30‧‧‧Key components
31‧‧‧Key Cap
32‧‧‧Scissors
40, 40a‧‧‧ backlight module
41, 41a‧‧‧ shading layer
411‧‧‧Transmission Department
42, 42a‧‧‧ light guide layer
421‧‧‧Light blocking structure
43, 43a‧‧‧reflective layer
431‧‧‧White coating
432‧‧‧dark coating
44, 44a‧‧ ‧ waterproof parts
50, 50a‧‧‧closed space

1 is a schematic diagram of a keyboard of one embodiment of the present invention. Fig. 2 is a schematic cross-sectional view taken along line A-A of Fig. 1. 3 is a partial plan view of the light guiding layer shown in FIG. 2. 4 is a cross-sectional view of a keyboard of another embodiment of the present invention.

1‧‧‧ keyboard

10‧‧‧floor

11‧‧‧ upper surface

12‧‧‧ Lower surface

13‧‧‧Opening

20‧‧‧Film board

30‧‧‧Key components

31‧‧‧Key Cap

32‧‧‧Scissors

40‧‧‧Backlight module

41‧‧‧Lighting layer

411‧‧‧Transmission Department

42‧‧‧Light guide layer

421‧‧‧Light blocking structure

43‧‧‧reflective layer

431‧‧‧White coating

432‧‧‧dark coating

44‧‧‧Waterproof parts

50‧‧‧closed space

Claims (20)

A keyboard comprising: a bottom plate having an opposite upper surface and a lower surface; a thin film circuit board disposed on the upper surface of the bottom plate; a plurality of button assemblies disposed on the upper surface of the bottom plate; and a backlight module The utility model comprises: a light shielding layer disposed on the lower surface of the bottom plate; a light guiding layer disposed under the light shielding layer; a reflective layer disposed under the light guiding layer; and a waterproof member on one side thereof The light-shielding member and the reflective layer together form a closed space, and the light-guiding layer is received in the closed space. The keyboard of claim 1, wherein the light guiding layer has at least three light blocking structures disposed on a periphery of the light guiding layer. The keyboard of claim 2, wherein the light blocking structures are formed by laser processing. The keyboard of claim 3, wherein the light blocking structures are linear and arranged in sequence on the periphery of the light guiding layer. The keyboard of claim 1, wherein the waterproof member is a light transmissive material. The keyboard of claim 1, wherein the reflective layer further has a white coating on an inner surface of the reflective layer. The keyboard of claim 1, wherein the reflective layer further has a dark coating on an outer surface of the reflective layer. The keyboard of claim 1, wherein the other side of the waterproof member is fixed to the lower surface of the bottom plate. The keyboard of claim 1, wherein the light shielding layer extends to a periphery of the bottom plate, and the other side of the waterproof member is fixed below the light shielding layer. The keyboard of claim 9, wherein the light shielding layer is located between the bottom plate and the waterproof member. A backlight module is disposed on a lower surface of a bottom plate of a keyboard, the backlight module includes: a light shielding layer disposed on the lower surface of the bottom plate; a light guiding layer disposed under the light shielding layer; a reflection a layer disposed below the light guiding layer; and a waterproof member having one side connected to the reflective layer and the other side disposed under the bottom plate, and the waterproof member and the reflective layer together form a closed space The light guiding layer is accommodated in the closed space. The backlight module of claim 11, wherein the light guiding layer has at least three light blocking structures disposed on a periphery of the light guiding layer. The backlight module of claim 12, wherein the light blocking structures are formed by laser processing. The backlight module of claim 13, wherein the light blocking structures are linear and arranged in sequence on the periphery of the light guiding layer. The backlight module of claim 11, wherein the waterproof member is a light transmissive material. The backlight module of claim 11, wherein the reflective layer further has a white coating on an inner surface of the reflective layer. The backlight module of claim 11, wherein the reflective layer further has a dark coating on an outer surface of the reflective layer. The backlight module of claim 11, wherein the other side of the waterproof member is fixed to the lower surface of the bottom plate. The backlight module of claim 11, wherein the light shielding layer extends to a periphery of the bottom plate, and the other side of the waterproof member is fixed below the light shielding layer. The backlight module of claim 19, wherein the light shielding layer is located between the bottom plate and the waterproof member.