CN210518259U

CN210518259U - Capacitive touch backlight key board with large application range

Info

Publication number: CN210518259U
Application number: CN201921877635.4U
Authority: CN
Inventors: 龚海元
Original assignee: Carel Electronics Suzhou Co Ltd
Current assignee: Carel Electronics Suzhou Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-05-12
Anticipated expiration: 2029-11-01

Abstract

The utility model provides a capacitanc touch keypad in a poor light that range of application is big, include main line board, thickening layer and the panel layer that sets gradually from bottom to top, be provided with a plurality of touch buttons and a plurality of light-emitting component, light guide plate on the main line board, light-emitting component sets up one side of touch button, the utility model discloses in be provided with touch button and light-emitting component's main line board adopts the FPC soft slab to replace current PCB hardboard, has reduced the thickness of product, has reduced the roughness requirement and the installation requirement to the shell that is pasted, has guaranteed the reliability of product; meanwhile, a latticed first shielding stratum is laid around the touch key to prevent water drops from covering the surface of the key to influence the change of the capacitance value of the key to the earth, avoid the mistaken touch of the key and ensure the unchanged sensitivity; in addition, the MCU module in the control assembly and an external product adopt an I2C communication mode, which is beneficial to the standardization of the product and enlarges the application range of the product.

Description

Capacitive touch backlight key board with large application range

Technical Field

The utility model belongs to the technical field of electric capacity touch button and specifically relates to a capacitanc touch keypad in a poor light that range of application is big is related to.

Background

The capacitive touch backlight key board in the market at present has certain limitation to the application environment, when the product is used under the condition of high environmental humidity and water drops or water is coated on the surface of the key, the key can generate misoperation and poor sensitivity and is sensitive to the environmental humidity; the product design depends on the attached shell material, and different adjustments need to be made on the product design for the metal and nonmetal shells so as to ensure that the sensitivity of the touch key achieves the consistent effect and the anti-interference performance is strong, so that the application of the metal and nonmetal shells cannot be simultaneously met.

In addition, the circuit board of current touch button adopts the PCB hardboard, and the thickness of product is great, and the installation of being inconvenient, and to being pasted the roughness requirement of shell higher, influenced the reliability of product.

Disclosure of Invention

In order to solve the above problems, the utility model provides a capacitanc touch keypad in a poor light that range of application is big.

The main contents of the utility model include:

a capacitive touch backlight key board with a large application range comprises a main circuit board, a thickening layer and a panel layer which are sequentially arranged from bottom to top, wherein the main circuit board is an FPC (flexible printed circuit) circuit board, the main circuit board comprises a touch part and a connecting part, a plurality of touch keys and a plurality of light-emitting assemblies are arranged on the touch part, the light-emitting assemblies are arranged on one sides of the touch keys, the touch keys are circular bonding pads, and a latticed first shielding stratum is paved around the touch keys; the thickening layer is provided with an abdicating through hole, a light guide plate is arranged in the abdicating through hole right above the touch key, and the light-emitting component penetrates through the abdicating through hole and extends to the lower part of the panel layer; the connecting part is provided with a control assembly, and the control assembly comprises an MCU module; one end of the connecting part is provided with a golden finger, and the MCU module is connected with the golden finger through an I2C communication bus.

Preferably, a second shielding ground layer is arranged on the back of the touch key.

Preferably, the first and second barrier ground layers are copper foil layers.

Preferably, the light emitting assembly is a side emitting LED.

Preferably, a first bonding layer is arranged below the main circuit board, a second bonding layer is arranged between the main circuit board and the light guide layer and between the thickening layers, and a third bonding layer is arranged between the thickening layers and the panel layer.

Preferably, the thickness of the main circuit board is 0.2 mm; the thickness of the thickening layer is 0.5 mm; the thickness of the light guide layer is 0.5 mm; the thickness of the panel is 0.2 mm; the thickness of the first bonding layer is 0.7 mm; the thickness of the second bonding layer is 0.2 mm; the thickness of the third bonding layer is 0.2 mm.

Preferably, a fourth adhesive layer is arranged on one side of the connecting portion, and the fourth adhesive layer is an adhesive tape.

Preferably, the panel layer is made of a PET material with a frosted surface, and the thickening layer is made of a black PET material.

Preferably, the MCU module is ATtiny 1616 of Atmel corporation.

The beneficial effects of the utility model reside in that: the utility model provides a large application range's capacitanc touch keypad in a poor light, the main circuit board that is provided with touch button and light-emitting component adopts the FPC soft board to replace current PCB hard board, has reduced the thickness of product, has reduced the roughness requirement and the installation requirement to the shell that is pasted, has guaranteed the reliability of product; meanwhile, a latticed first shielding stratum is laid around the touch key to prevent water drops from covering the surface of the key to influence the change of the capacitance value of the key to the earth, avoid the mistaken touch of the key and ensure the unchanged sensitivity; in addition, the MCU module in the control assembly and an external product adopt an I2C communication mode, which is beneficial to the standardization of the product and enlarges the application range of the product.

Drawings

Fig. 1 is a schematic side view of the present invention.

Detailed Description

The technical solution protected by the present invention will be specifically described below with reference to the accompanying drawings.

Please refer to fig. 1. The utility model provides a capacitanc touch keypad in a poor light that range of application is big, it can use in various products such as gradevin, is connected with the control unit of various products. Specifically, capacitanc touch keypad in a poor light includes by main line board 11, thickening layer 12 and the panel layer 13 that sets gradually from bottom to top, wherein, main line board 11 is attached on the shell of product through first tie coat 14, thickening layer 12 with main line board 11 passes through second tie coat 15 is range upon range of, and is identical, panel layer 13 passes through third tie coat 16 is attached leaded light layer 12 top.

In this embodiment, the main circuit board 11 is an FPC circuit board, and compared with a conventional PCB hard board, the main circuit board 11 makes a product softer and easier to mount, and the requirement for the surface flatness of the product to be attached is lower than that of the conventional PCB hard board, thereby improving the reliability of the product.

Further, in one of the embodiments, the thickness of the main wiring board 11 is 0.2 mm; the thickness of the thickening layer 12 is 0.5 mm; the thickness of the panel layer 13 is 0.2 mm; the thickness of the first adhesive layer 14 is 0.7 mm; the thickness of the second bonding layer 15 is 0.2 mm; the thickness of the third bonding layer 16 is 0.2mm, and compared with the existing touch key, the thickness of the product is reduced, and the installation is more convenient to a certain extent. Preferably, the panel layer 13 is made of a PET material having a frosted surface, and the thickening layer 12 is made of a black PET material.

The main circuit board 11 is a core component for realizing a touch action, in one embodiment, the main circuit board 11 includes a touch portion 10 and a connecting portion 20, and since the main circuit board 11 is an FPC flexible board, the main circuit board 11 has flexibility and can be bent, as shown in fig. 1, the connecting portion 20 is vertically disposed with respect to the touch portion 10, further, the touch portion 10 is provided with a plurality of touch keys 30 and a plurality of light emitting components 40, in this embodiment, the touch keys 30 are divided into two groups symmetrically disposed, each group has 3 touch keys, one side of each touch key is provided with the light emitting component 40, and meanwhile, a light guide plate 120 is disposed over the touch keys 30 and matched with the light emitting components 40.

In one embodiment, the touch key 30 is a circular pad, and in order to avoid the capacitance value of the key to the ground changing due to the attachment of water drops, a first shielding ground layer (not shown in the figure) in a grid shape is laid around the touch key 30; in other embodiments, a second shielding layer (not shown in the figures) is disposed on the back surface of the touch key 30, so that the capacitance of the key to the ground is not changed due to the material attached to the housing, the consistency of the key sensitivity is ensured, and the key has stronger interference resistance. Preferably, the first and second barrier ground layers are copper foil layers.

The light emitting assembly 40 is vertically arranged on the main circuit board 11, specifically, an abdicating through hole is formed in the thickening layer 12, the light emitting assembly 40 passes through the abdicating through hole and extends to the lower part of the panel layer 13, and the light guide plate 120 is also arranged in the abdicating through hole, is positioned right above the touch key, and is connected with the main circuit board 11 through a second bonding layer 15; namely, the second adhesive layer 15 and the third adhesive layer 16 are also provided with offset through holes so as to facilitate the light emitting assembly 40 to pass through, in one embodiment, the light emitting assembly 40 is a side-emitting LED.

In one embodiment, a control component 21 is disposed on the connection portion 20, and the control component 21 includes an MCU module; one end of the connecting part 20 is provided with a golden finger 22, the MCU module is connected with the golden finger 22 through an I2C communication bus, namely, the MCU module is communicated with an external product through an I2C communication mode, so that the application range of the product is enlarged, the standardization of the product is facilitated, in addition, one side of the connecting part 20 is provided with a fourth bonding layer 23, and the fourth bonding layer 23 is an adhesive tape. Preferably, the MCU module is ATtiny 1616 of Atmel corporation.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A capacitive touch backlight key board with a large application range is characterized by comprising a main circuit board, a thickening layer and a panel layer which are sequentially arranged from bottom to top, wherein the main circuit board is an FPC (flexible printed circuit) circuit board, the main circuit board comprises a touch part and a connecting part, the touch part is provided with a plurality of touch keys and a plurality of light-emitting components, the light-emitting components are arranged on one side of the touch keys, the touch keys are circular bonding pads, and a latticed first shielding stratum is paved around the touch keys; the thickening layer is provided with an abdicating through hole, a light guide plate is arranged in the abdicating through hole right above the touch key, and the light-emitting component penetrates through the abdicating through hole and extends to the lower part of the panel layer; the connecting part is provided with a control assembly, and the control assembly comprises an MCU module; one end of the connecting part is provided with a golden finger, and the MCU module is connected with the golden finger through an I2C communication bus.

2. The backlight keypad of claim 1, wherein a second shielding layer is disposed on the back of the touch key.

3. The capacitive touch backlight keypad of claim 2, wherein the first shielding layer and the second shielding layer are copper foil layers.

4. The backlight keypad for capacitive touch according to claim 1, wherein the light emitting elements are side-emitting LEDs.

5. The backlight keypad of claim 1, wherein a first adhesive layer is disposed under the main circuit board, a second adhesive layer is disposed between the main circuit board and the light guide layer and between the thickening layers, and a third adhesive layer is disposed between the thickening layers and the panel layer.

6. The capacitive touch backlight key board with the wide application range according to claim 5, wherein the thickness of the main circuit board is 0.2 mm; the thickness of the thickening layer is 0.5 mm; the thickness of the light guide layer is 0.5 mm; the thickness of the panel is 0.2 mm; the thickness of the first bonding layer is 0.7 mm; the thickness of the second bonding layer is 0.2 mm; the thickness of the third bonding layer is 0.2 mm.

7. The backlight keypad for capacitive touch according to claim 1, wherein a fourth adhesive layer is disposed on one side of the connection portion, and the fourth adhesive layer is an adhesive tape.

8. The capacitive touch backlight key board with the wide application range of claim 1, wherein the panel layer is made of PET with a frosted surface; the thickening layer is made of black PET.

9. The backlight keypad for capacitive touch according to claim 1, wherein the MCU module is attny 1616 from Atmel corporation.