CN201392757Y - Key conducting device - Google Patents

Abstract

The utility model relates to a key conduction device, which comprises a circuit board and a conducting layer. The circuit board is provided with a reference area and a plurality of touch key areas. Wherein the reference region is disposed around the circuit board and surrounds the plurality of touch key regions. In addition, the conducting layer is provided with a plurality of keys and is arranged on the circuit board and is electrically connected with the reference area of the circuit board, and meanwhile, the keys arranged on the conducting layer are respectively configured corresponding to the touch key areas of the circuit board. The utility model discloses a circuit board only needs the configuration button to switch on positive plate, consequently the area of pressing the key zone on the reducible circuit board, and then provides the demand that the product is miniaturized. And simultaneously, the utility model discloses the button contact on the circuit board only needs the contact button to switch on positive plate portion simply and can switch on, and then can prevent that the condition that the button displacement leads to contact failure from taking place. In addition, the conducting layer is electrically connected to the reference area on the circuit board of the utility model, thereby can produce the protection of electromagnetic interference and static one.

Description

Button conduction device

technical field

The utility model relates to a key conduction device, in particular to a key conduction device which is used for data input operation of an electronic device and has the functions of electromagnetic interference protection (EMI) and static electricity protection (ESD).

Background technique

With the advancement of science and technology, many electronic products are widely used due to the advantages of miniaturization and portability, such as digital cameras, mobile phones, notebook computers, personal digital assistants and handheld game consoles. At the same time, most of these electronic products use thin film key devices as interfaces for users to input data.

Referring to FIG. 1 , it is a schematic structural diagram of a traditional thin film key device. As shown in FIG. 1 , a conventional thin film key device is mainly provided with a plurality of key areas 3 on a circuit board 4, and each key area 3 has a key conduction positive pole portion 32 and a key conduction negative pole portion 30, At the same time, the key conduction negative pole part 30 is disposed on the periphery of the key conduction positive pole part 32 through an insulating part 33 . In addition, a conductive film 34 is disposed on the keypad 3 , and the conductive film 34 is electrically connected to the key-conducting negative portion 30 and covers the key-conducting positive portion 32 . When the conductive film 34 is pressed, the corresponding key conduction positive portion 32 and the key conduction negative portion 30 in the key area 3 will be in a conduction state. At this time, the circuit board 4 will further generate a corresponding key signal (not shown) according to the conduction state.

It can be known from the foregoing that the overall area of the circuit board 4 is closely related to the number of keypads 3 . The more the number of keypads 3 is, the larger the overall area of the circuit board 4 is to satisfy the configuration of the keypads 3 . However, in the above-mentioned traditional thin film key device, each key area 3 is all made up of the key conduction positive pole part 32, the insulating part 33 and the key conduction negative pole part 30, therefore, each part is connected with the circuit board 4 in the key area 3. The overall area is closely related. At the same time, in the face of the trend of miniaturization of products in the market, the traditional membrane key device has been unable to meet the demand for miniaturized products in the market.

In addition, when the user presses the traditional membrane key device for data input, if the key is displaced and only the key is pressed to conduct the negative electrode portion 30 , a poor contact will occur. In this way, the traditional thin film key device cannot provide the user with a relatively complete key conduction input function.

Contents of the invention

In view of this, the purpose of this utility model is to provide a key conduction device, which is provided with a plurality of positive poles on the circuit board, and at the same time, a conductive layer is electrically connected to the ground terminal of the circuit board, so that it itself maintains the negative pole. state, and when the conductive layer is pressed to a positive pole and turned on, the circuit board will generate a corresponding key signal.

The button conduction device of the utility model includes a circuit board and a conductive layer. Wherein, the circuit board has a reference area and a plurality of key touch areas, wherein the reference area is arranged around the circuit board, and the reference area surrounds the plurality of key touch areas. The conductive layer has a plurality of keys, the conductive layer is arranged on the circuit board and electrically connected to the reference area, wherein the plurality of keys correspond to the plurality of touch key areas respectively.

In this way, the beneficial effect of the utility model is that the circuit board of the utility model only needs to be equipped with a plurality of positive touch pads, so that the overall area of the touch pads can be reduced, thereby satisfying the demand for product miniaturization. At the same time, the key contacts on the circuit board of the present invention can be turned on only by simply touching multiple key touch areas of the positive electrode, thereby preventing poor contact caused by key displacement. In addition, the conductive layer is electrically connected to the reference area of the negative electrode on the circuit board of the utility model, so that a protection against electromagnetic interference and static electricity can be produced.

The above summary and the following detailed description are examples and are intended to further illustrate the scope of the present invention. Other purposes and advantages of the present invention will be described in the following description and accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of a traditional button conduction device;

Fig. 2 is a schematic cross-sectional structure diagram of a button conduction device according to the first preferred embodiment of the present invention;

Fig. 3 is the schematic diagram of the conductive layer structure of the first preferred embodiment of the utility model;

Fig. 4 is a schematic diagram of the circuit board structure of the first preferred embodiment of the utility model;

Fig. 5 is a schematic cross-sectional structure diagram of a button conduction device according to a second preferred embodiment of the present invention; and

FIG. 6 is a schematic diagram of the conductive layer structure of the second preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

Key area 3 Negative part 30 is turned on by the key

Key conduction positive part 32 insulation part 33

Conductive film 34 circuit board 4

Key conduction device 1 circuit board 10

Reference area 100 Touch key area 102

Conductive layer 12 Button 120

Insulation space 124 key conduction device 2

Conductive layer 12' Conductive film 120'

Dome-shaped metal button 122 Insulation space 124'

Detailed ways

Referring to FIG. 2 , it is a schematic cross-sectional structure diagram of a key conducting device according to a first preferred embodiment of the present invention. As shown in FIG. 2 , the key conducting device 1 includes a circuit board 10 and a conductive layer 12 . Wherein, the circuit board 10 has a reference area 100 and a plurality of key touch areas 102, wherein the reference area 100 is arranged around the circuit board 10, and the reference area 100 surrounds the plurality of key touch areas 102 Around, the aforementioned reference area is the negative pole. Meanwhile, the plurality of touch pads 102 are positive and coupled to a key determination unit (not shown) in the circuit board 10 . In addition, the conductive layer 12 is arranged on the circuit board 10, and is electrically connected to the reference area 100. At the same time, the plurality of keys 120 arranged on the conductive layer 12 are respectively corresponding to the plurality of touch key areas 102, and each corresponding key 120 is connected to the reference area 100. An insulating space 124 is formed between the touch pads 102 .

In conjunction with Figure 2, please refer to Figure 3. Fig. 3 is a schematic diagram of the conductive layer structure of the first preferred embodiment of the present invention. The plurality of buttons 120 provided on the conductive layer 12 are in the shape of a dome, and have both conductivity and elasticity. The aforementioned conductive layer 12 can be a conductive thin film layer, or a thin film layer coated with conductive glue.

In conjunction with Figure 2, please refer to Figure 4. Fig. 4 is a schematic diagram of the circuit board structure of the first preferred embodiment of the present invention. The reference area 100 set on the circuit board 10 is a key conduction negative area, and at the same time, a plurality of key touch areas 102 are a key conduction positive area. In addition, the reference area 100 is disposed around the circuit board 10 to serve as EMI protection and ESD protection for other electronic components on the circuit board 10 .

Refer to Figure 2. When a key 120 is pressed and touches the corresponding touch area 102 , the key determination unit (not shown) in the circuit board 10 determines a conduction state, and accordingly generates a key signal (not shown).

In conjunction with Figure 2, please refer to Figure 5. FIG. 5 is a schematic cross-sectional structure diagram of a key conducting device according to a second preferred embodiment of the present invention. The components in the second preferred embodiment of the present invention are the same as those in the first preferred embodiment, and are marked with the same reference numerals. The second preferred embodiment and the first preferred embodiment have the same circuit working principle and achieved effect, and the main difference is that the conductive layer 12' used in the key conducting device 2 of the second preferred embodiment is composed of one The conductive film 120' with a plurality of dome-shaped thin film keys is combined with a plurality of dome-shaped metal domes 122 (metal dome). Wherein, each dome-shaped metal key 122 is correspondingly disposed on the inner side of each dome-shaped film key through the use of conductive glue (not shown), and corresponds to the touch key area 102 on the circuit board 10 . In the foregoing, an insulating space 124' is formed between each corresponding dome-shaped metal key 122 and the key touch area 102.

In conjunction with Figure 5, refer to Figure 6. FIG. 6 is a schematic diagram of the conductive layer structure of the second preferred embodiment of the present invention. In the conductive layer 12', the inner side of the dome-shaped film button of the conductive film 120' is pasted with a dome-shaped metal button 122, which has both conductivity and elasticity.

Refer to Figure 5. When a certain dome-shaped film key of the conductive film 120' is pressed and the corresponding dome-shaped metal key 122 contacts the corresponding key touch area 102, the key judgment unit (not shown) in the circuit board 10 judges that A conduction state correspondingly generates a key signal (not shown).

To sum up, the circuit board of the present invention only needs to be equipped with a button to connect the positive electrode, but does not need to be equipped with a button to connect the negative electrode. Therefore, the area of the button area on the circuit board can be reduced, thereby meeting the demand for product miniaturization. At the same time, the button contact on the circuit board of the utility model can be turned on only by simply touching the positive electrode portion of the button, thereby preventing poor contact caused by button displacement. In addition, the conductive layer is electrically connected to the reference area on the circuit board of the present invention, thereby providing a protection against electromagnetic interference and static electricity.

However, the above descriptions are only the detailed description and drawings of the best specific embodiments of the present utility model, and any changes or modifications that can be easily conceived by those skilled in the art within the scope of the present utility model can be included in this utility model. Within the scope defined by the appended claims of the utility model.

Claims (8)

1. A button conduction device, characterized in that, comprising: A circuit board having a reference area and a plurality of key touch areas, wherein the reference area is arranged around the circuit board, and the reference area surrounds the plurality of touch key areas; and A conductive layer has a plurality of keys, the conductive layer is arranged on the circuit board and electrically connected to the reference area, and the plurality of keys correspond to the plurality of key touch areas respectively. 2. The key conduction device according to claim 1, wherein an insulating space is formed between each corresponding key and the key touch area. 3. The key conduction device according to claim 2, wherein the key is a dome-shaped key. 4. The key conduction device according to claim 3, wherein the conductive layer is a conductive film layer. 5. The key conducting device according to claim 3, wherein the conductive layer is a film layer coated with conductive glue. 6. The button conducting device according to claim 3, wherein the conductive layer is composed of a conductive film and a plurality of dome-shaped metal buttons. 7. The device for turning on the key according to claim 1, wherein the reference area is a negative area for turning on the key. 8 . The key conduction device according to claim 1 , wherein the plurality of key touch areas are a key conduction positive area.

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