CN215578300U

CN215578300U - Keyboard backlight module

Info

Publication number: CN215578300U
Application number: CN202122128538.9U
Authority: CN
Inventors: 郭明明
Original assignee: Kunshan Demi Hengye Electronics Co ltd
Current assignee: Kunshan Demi Hengye Electronics Co ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2022-01-18
Anticipated expiration: 2031-09-03

Abstract

The utility model discloses a keyboard backlight module, which comprises a PCBA, a reflecting layer, a light guide plate and a shading layer, wherein the PCBA, the reflecting layer, the light guide plate and the shading layer are sequentially arranged, the reflecting layer and the light guide plate are both provided with coaxial through holes, and the shading layer is provided with light holes coaxial with the through holes; the PCBA is provided with a light source which is positioned below the axis of the through hole of the reflecting layer. According to the utility model, the hole is broken in the PCB, the LED lamp is welded on the back of the PCB, the LED lamp is hidden in the light source hole of the PCB, the hole is broken in the reflecting layer, the light guide plate and the light shielding layer, the broken holes of the reflecting layer, the light guide plate and the light shielding layer are concentric with the broken hole of the PCB, the LED lamp enters light from the cross section of the light guide plate, the keycap emits light uniformly, and the problem of nonuniform light emission of the existing keyboard backlight module is perfectly solved. In addition, the keyboard backlight module can greatly reduce the thickness of the backlight module of the existing game notebook computer in mass production.

Description

Keyboard backlight module

Technical Field

The utility model relates to the technical field of computers, in particular to a keyboard backlight module.

Background

The keyboard is one of the indispensable input devices for computers, and is mainly used for inputting characters, symbols or numbers. The existing keyboard generally comprises a supporting plate, a middle plate arranged on the supporting plate, a conductive film arranged on the middle plate, a plurality of scissor feet arranged on the middle plate, a keycap arranged on the scissor feet and a plurality of silica gel rings arranged between the plurality of keycaps and the conductive film.

With the increasing popularization of computers, users can use the computers in various environments, and when the computers are used in environments with insufficient light, the users often have difficulty in accurately knocking the keyboards due to the fact that the users cannot see keys on the keyboards clearly, and inconvenience is brought to the use of the computers. To solve this problem, the existing keyboard manufacturers have developed a light-emitting keyboard suitable for use in dark environments, which not only enables users to clearly identify the symbols and characters on the keys in dark environments, but also has a fashionable appearance and novel user experience, and is increasingly applied to notebook computers and game keyboards.

An existing light-emitting keyboard generally needs to be additionally provided with a backlight module to emit light, specifically, the backlight module includes a light-emitting diode (LED) light bar as a light source and a light guide plate for guiding light, the light guide plate is disposed below a keycap, and meanwhile, the keycap is made of a transparent material. When the light guide plate is in work, the light emitting diode light bar emits light, the light rays are emitted into the light guide plate, guided by the light guide plate and then emitted into the keycap, and the keycap transmits the light rays to realize the light emission. The backlight module with the structure is thick, the thickness is commonly about 0.7mm, the overall structure of the keyboard is easy to be too thick, and the light and thin design of the keyboard is not facilitated; in addition, the existing keyboard backlight module has poor light emitting uniformity of key characters, only the middle characters of keys above the light emitting diodes are very bright, the characters at the corners of the keys are not bright or very dark, and form an obvious difference with the brightness of the middle characters of the keys, so that the brightness uniformity of the whole keyboard is poor, and the use requirements of consumers are difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a keyboard backlight module, which solves the problems that the existing keyboard backlight module has poor uniformity of light emission of key characters, only the middle characters of keys above a light-emitting diode are very bright, the characters at the corners of the keys are not bright or very dark, an obvious fall is formed between the characters and the brightness of the middle characters of the keys, the brightness uniformity of the whole keyboard is poor, and the use requirements of consumers are difficult to meet.

In order to achieve the purpose, the utility model adopts the following technical scheme: a keyboard backlight module comprises a PCBA, a reflecting layer, a light guide plate and a shading layer, wherein the PCBA, the reflecting layer, the light guide plate and the shading layer are sequentially arranged, the reflecting layer and the light guide plate are both provided with coaxial through holes, and the shading layer is provided with light holes coaxial with the through holes; the PCBA is provided with a light source, and the light source is located below the axis of the through hole of the reflecting layer. The light source can send light towards the light guide plate, the light of light source can transversely be received to the cross section of light guide plate to the guide received light is towards the distant place transmission, can make the light of transmission upwards get into the key cap region through the light trap of light shield layer, with provide being shaded to the key cap region, light up the character on the key cap, make the key cap luminous even, the not even problem of shining that current keyboard backlight unit exists has perfectly been solved, satisfy the user to keyboard backlight unit's demand.

As an alternative of the utility model, the PCBA includes a PCB board, a light source hole is formed on the PCB board, and the light source is embedded in the light source hole to reduce the thickness of the keyboard backlight module.

As an alternative of the utility model, the diameter of the through hole is larger than the diameter of the light source hole.

As an alternative scheme of the utility model, keycaps are arranged above the light holes, the keycaps, the light holes, the through holes and the light sources are all arranged in a one-to-one correspondence manner, each keycap corresponds to one light source, and the light source and the light emitting of each keycap are independent, so that adjacent keys cannot be subjected to light fleeing.

As an alternative of the utility model, the light source is an LED lamp.

As an alternative of the present invention, the reflective layer includes a reflective film attached to the surface of the light guide plate, and an ink layer disposed on the surface of the reflective film. The function of reflector plate is realized after reflectance coating and printing ink layer combine, and it can directly replace traditional solitary reflector plate, has realized the integral type structure moreover, and it has simplified the equipment flow, and it is more convenient to use.

As an alternative of the utility model, the ink layer is printed on the surface of the reflective film, so that the thickness of the backlight module is reduced, the thickness requirement of a light and thin notebook computer can be effectively met, the pressing stroke of the keyboard can be effectively increased on the premise that the total height of the keyboard is not changed, the hand feeling experience of a user is improved, the production process of the whole backlight module is simplified, and the material and assembly cost is greatly reduced.

As an alternative of the present invention, the thickness of the light guide plate and the reflective layer after bonding is 0.16 mm.

As an alternative of the utility model, the light-shielding layer has a thickness of 0.025 mm.

The utility model has the beneficial effects that:

the utility model provides a keyboard backlight module, which is characterized in that holes are formed in a PCB (printed circuit board), an LED lamp is welded on the back of the PCB, the LED lamp is hidden in a light source hole of the PCB, and then a reflecting layer, a light guide plate and a light shielding layer are arranged in the holes, the holes of the reflecting layer, the light guide plate and the light shielding layer are coaxial with the holes of the PCB, so that the LED lamp enters light from the cross section of the light guide plate, a keycap emits light uniformly, the problem of nonuniform light emission of the existing keyboard backlight module is perfectly solved, and the requirements of users on the keyboard backlight module are met. In addition, the backlight module can greatly reduce the thickness of the existing mass-produced game notebook computer from 0.7mm to 0.5mm, and can make the thickness of the whole keyboard thinner than the original thickness by 0.2 mm. The utility model overcomes the defects of uneven light emission and thicker thickness of the traditional backlight module, and the feasibility of the scheme is actually verified, so that the utility model can completely meet the urgent requirements of industrial users and is suitable for large-area popularization and application.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 3 is a schematic front view of an LED lamp according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a back structure of an LED lamp according to an embodiment of the present invention.

In the figure: 1-a reflective layer; 2-a light guide plate; 3-a light-shielding layer; 4-a PCB board; 5-LED lamps; 6-black mylar sheet; 7-LED pins.

Detailed Description

Examples

Some problems of the existing game notebook computer backlight module (Perkey backlight module) include:

1. the existing Perkey backlight module has poor light-equalizing effect, 1 LED is arranged below each key (keycap), so that the LED lighting area is a point due to the fact that the LED lighting area is small and the total thickness of the keyboard is relatively thin, the backlight is lighted, characters at the corners of the keys are not lighted at all, or the brightness is low, the brightness of the characters of the keys is uneven, and the user experience effect is poor;

2. the prior Perkey backlight module is very thick, the total thickness of the prior Perkey backlight module is about 0.7mm basically, the thickness is thick, the even gloss is poor, and the requirement of a user cannot be met;

3. the existing Perkey backlight module has the problem that light is mixed between adjacent keycaps, for example, a user wants a key A to be bright red in a certain scene, or the user wants the key A to be bright white and does not want to be lightened with an adjacent key S, and at this time, after the key A is lightened, the red of the key A is mixed with the key S due to the problem of light mixing, so that the key S is lightened with red.

To solve the above problem, as shown in fig. 1 to 4, this embodiment provides a keyboard backlight module, and this backlight module includes PCBA, reflective layer 1, light guide plate 2 and light shield layer 3, PCBA, reflective layer 1, light guide plate 2 and light shield layer 3 set gradually from bottom to top, coaxial perforating hole has all been seted up to reflective layer 1 and light guide plate 2, and the perforating hole size of reflective layer 1 and light guide plate 2 is the same, and the two coaxial settings. The light shielding layer 3 is provided with a light transmitting hole coaxial with the through hole, the light shielding layer 3 is positioned above the light guide plate 2, and the light transmitting hole is coaxial with the through holes of the reflecting layer 1 and the light guide plate 2. The PCBA is provided with a light source which is positioned below the axis of the through hole of the reflecting layer 1. The light source can send light towards light guide plate 2, the light of light source can transversely be received to the cross section of light guide plate 2 to the guide received light is towards the transmission of distant place, can make the light of transmission upwards get into the key cap region through the light trap of light shield layer 3, with regional being shaded to the key cap, light up the character on the key cap, make the key cap luminous even, the luminous inhomogeneous problem that current keyboard backlight unit exists has been perfectly solved, satisfy the user to keyboard backlight unit's demand.

As shown in fig. 3 and 4, specifically, the PCBA includes a PCB 4, a light source hole is opened on the PCB 4, and the light source is embedded in the light source hole to reduce the thickness of the keyboard backlight module. Preferably, the light source is an LED lamp 5, pins of the LED lamp 5 are soldered on the PCB board 4, and the LED lamp 5 is completely embedded in the light source hole. The LED lamp 5(Light Emitting Diode) is a solid semiconductor device capable of converting electric energy into visible Light, and directly converts electricity into Light. The heart of the LED is a semiconductor wafer, one end of the wafer is attached to a support, the other end of the wafer is a cathode, and the other end of the wafer is connected with an anode of a power supply, so that the whole wafer is packaged by epoxy resin. The semiconductor wafer is composed of two parts, one of which is a P-type semiconductor in which holes predominate and the other of which is an N-type semiconductor in which electrons predominate. When the two semiconductors are connected, a P-N junction is formed between them. When a current is applied to the wafer through the wire, electrons are pushed to the P region where they recombine with holes and then emit energy in the form of photons, which is the principle of the LED lamp 5 emitting light.

Light rays of the LED lamp 5 transversely enter the light guide plate 2 and are reflected by the reflecting layer 1 and then emitted from the light transmitting holes. The bottom of the PCB 4 is provided with a black mylar sheet 6, and the black mylar sheet 6 is used for wrapping the PCB 4 and the LED pins 7 of the LED lamp 5. The black mylar sheet 6 has excellent tear strength, heat and cold resistance, moisture and water resistance, chemical corrosion resistance and super-strong insulating property, can be used as an insulating material for motors, capacitors, coils and cables, and can also be made into a composite insulating material with highland barley paper. The insulating material is widely used in the electrical insulation industry, and is suitable for gaskets, baffle plates, screens and protection functions of electronics, household appliances, instruments, displays, slots of motors, computers and peripheral equipment. The black mylar film 6 can replace common adhesive tapes and is suitable for packaging electronic components when packaged on a machine, so that the LED lamp 5 is safer in use.

The diameter of perforating hole is greater than the diameter in light source hole, the perforating hole top is equipped with the key cap, and key cap, perforating hole and the equal one-to-one setting of light source, and every key cap corresponds a light source, and the light source and the luminous of every key cap are independent, ensure that adjacent button can not scurry light.

The reflecting layer 1 comprises a reflecting film and an ink layer, the reflecting film is attached to the surface of the light guide plate 2, and the ink layer is arranged on the surface of the reflecting film. The printing ink layer is printed on the surface of the reflecting film, the reflecting film and the printing ink layer are combined to realize the function of the reflecting sheet, the reflecting film can directly replace the traditional independent reflecting sheet, the integrated structure is realized, the assembling process is simplified, and the use is more convenient.

The utility model is mainly applied to the light-emitting keyboard of the light and thin notebook computer, combines the reflecting layer 1 with the light guide plate 2, reduces the thickness of the backlight module, can effectively meet the thickness requirement of the light and thin notebook computer, can effectively enlarge the pressing stroke of the keyboard on the premise of keeping the total height of the keyboard unchanged, improves the hand feeling experience of users, simplifies the production process of the whole backlight module, and greatly reduces the material and assembly cost.

Specifically, the thickness of the light guide plate 2 and the reflective layer 1 after bonding is within 0.2mm, and the thickness of the light shielding layer 3 is 0.025 mm. Preferably, the thickness of the light guide plate 2 and the reflective layer 1 after combination is 0.16mm-0.2mm, and the thickness of the light guide plate 2 is 0.125mm or 0.175mm, so that the thickness of the backlight module is between 0.16mm-0.2 mm. Further, the thickness that light guide plate 2 and reflection stratum 1 combine after is 0.16mm, chooses for use ultra-thin thickness to be 0.125 mm's light guide plate 2 for the thickness that light guide plate 2, reflectance coating and printing ink layer combine after is 0.16mm, and ultra-thin design breaks through backlight unit's in the trade thickness restriction, can satisfy the demand of Perkey backlight unit.

According to the utility model, holes are formed in the PCB 4, the LED lamp 5 is welded on the back of the PCB 4, the LED lamp 5 is hidden in the light source hole of the PCB 4, the reflecting layer 1, the light guide plate 2 and the light shielding layer 3 are punched, the punched holes of the reflecting layer 1, the light guide plate 2 and the light shielding layer 3 are concentric with the punched hole of the PCB 4, the LED lamp 5 enters light from the cross section of the light guide plate 2, so that the keycap emits light uniformly, the problem of nonuniform light emission of the conventional Perkey backlight module is perfectly solved, and the requirements of users on the Perkey backlight module are met. In addition, the backlight module can greatly reduce the thickness of the existing mass-produced game notebook computer from 0.7mm to 0.5mm, and can make the thickness of the whole keyboard thinner than the original thickness by 0.2 mm. The utility model overcomes the defects of uneven light emission and thicker thickness of the traditional backlight module, and the feasibility of the scheme is actually verified, so that the utility model can completely meet the urgent requirements of industrial users and is suitable for large-area popularization and application.

In the description of the present invention, the terms "mounted," "connected," "fixed," and the like are to be understood broadly and may be fixedly connected, detachably connected, or integrated; may be a mechanical or electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. Those skilled in the art will understand the specific meaning of the above terms in the present invention. Furthermore, the particular features, structures, etc. described in the examples can be included in at least one implementation and can be combined by one skilled in the art without conflicting therewith. The protection scope of the present invention is not limited to the above specific examples, and embodiments that can be imagined by those skilled in the art without creative efforts based on the basic technical concept of the present invention belong to the protection scope of the present invention.

Claims

1. The keyboard backlight module is characterized by comprising a PCBA, a reflecting layer (1), a light guide plate (2) and a shading layer (3), wherein the PCBA, the reflecting layer (1), the light guide plate (2) and the shading layer (3) are sequentially arranged, the reflecting layer (1) and the light guide plate (2) are provided with coaxial through holes, and the shading layer (3) is provided with light holes coaxial with the through holes; the PCBA is provided with a light source which is positioned below the axis of the through hole of the reflecting layer (1).

2. The keyboard backlight module according to claim 1, wherein the PCBA comprises a PCB (4), the PCB (4) is provided with a light source hole, and the light source is embedded in the light source hole.

3. The keyboard backlight module according to claim 2, wherein the diameter of the through hole is larger than the diameter of the light source hole.

4. The backlight module of claim 2, wherein a key cap is disposed above the light hole, and the key cap, the light hole, the through hole and the light source are disposed in a one-to-one correspondence.

5. The keyboard backlight module according to claim 2, wherein the light source is an LED lamp (5).

6. The keyboard backlight module according to any one of claims 1-5, wherein the reflective layer (1) comprises a reflective film and an ink layer, the reflective film is attached to the surface of the light guide plate (2), and the ink layer is disposed on the surface of the reflective film.

7. The keyboard backlight module of claim 6, wherein the ink layer is printed on a surface of the reflective film.

8. The keyboard backlight module according to claim 6, wherein the thickness of the light guide plate (2) and the reflective layer (1) after combination is 0.16 mm.

9. The keyboard backlight module according to claim 1, wherein the light shielding layer (3) has a thickness of 0.025 mm.