CN102006048A - Key detecting board - Google Patents

Abstract

A key detection board, comprising: a board body; a plurality of detection keys, the detection keys include a first detection key located on one side of the board body, the first detection key includes a plurality of sub-keys detection key, and the area of any sub-detection key located on the surface of the plate body is different from other sub-detection keys; the second detection key located on the side of the plate body, and the second detection key half surrounds the first detection key A detect button. The button detection board provided by the invention can reduce the calculation amount of the processing chip and reduce the power consumption.

Description

Key detection board

technical field

The invention relates to the touch field, in particular to a key detection board.

Background technique

With the continuous development of electronic technology, buttons are widely used in household appliances or consumer electronic products due to their fast response, wide application, and adaptability to harsh environments, so that users have more and more opportunities to use buttons to operate. For example, the user can make a call or edit a short message through the keyboard keys of the mobile terminal, select a TV channel through the keys of the TV set, and perform fast forward, rewind or volume selection through the keys of the DVD.

The US Patent Application No. US2005/0179673A1 discloses a capacitive key that senses the touch of the user's finger. The existing capacitive key usually includes a key detection board and a keyboard corresponding to the key detection board. Please refer to Figure 1. Fig. 1 is a schematic diagram of the existing keys, including: a keyboard 10, the keyboard 10 is used to receive user instructions, and the surface of the keyboard 10 usually has a button (generally expressed as a picture or text) that prompts the user, such as start or start Icon, forward or forward icon, stop or stop icon...; button detection board 20, when the user touches or clicks the button on the surface of the keyboard 10, detects the user instruction received by the keyboard, and sends the user instruction Converted into a working signal and transmitted to a processing chip (not shown) connected to the key detection board 20, the key detection board 20 includes a board body 21 and a detection key 22, and the board body 21 is usually a printed circuit board ( Printed Circuit Board; PCB) or flexible printed circuit (Flexible Printed Circuit; FPC) board, the board body 21 provides a platform for carrying the detection key 22 and provides an interface for the processing chip, and the detection key 22 is located on the board body 21 The surface is used for detecting that the keyboard receives a user instruction, and transmitting the working signal.

But along with the further development of electronic technology, the user of existing key detection plate needs to touch the key on keyboard 10 surface and just can work, and is in high temperature or other extreme working environment when keyboard 10 can't be applicable, and existing key detection The anti-interference ability of the board is poor, and the key resolution is low, which cannot meet the requirements of the development of the times.

Contents of the invention

The problem to be solved by the present invention is to provide a new key detection board, which can simplify the process of key judgment and identification, solve the problem that the keyboard is in high temperature or other extreme working environment and cannot be applied and the key detection board has poor anti-interference ability and poor anti-interference ability question.

In order to solve the above problems, the present invention provides a key detection board, comprising: a board body; a plurality of detection keys, the detection keys include a first detection key located on one side of the board body, the The first detection key includes a plurality of sub-detection keys, and the area of any sub-detection key located on the surface of the plate body is different from other sub-detection keys; the second detection key located on the side of the plate body, and the second The detection key half surrounds the first detection key.

Optionally, the board body further includes a processing chip.

Optionally, the area of the first detection key on the surface of the board is proportional to the distance between the first detection key and the processing chip.

Optionally, the board body has a working surface and an adjacent surface adjacent to the working surface, and the first detection key is located on the working surface and the adjacent surface of the board body.

Optionally, there is an air partition between the first detection keys.

Optionally, the third detection key is located on the surface of the board, and any sub-detection key is surrounded by the third detection key.

Optionally, the third detection key is a metal sheet.

Optionally, the third detection key is connected to the processing chip through a metal wire, and the third detection key is used for judging an invalid operation by the user.

Compared with the prior art, the present invention has the following advantages: the key detection board provided by the present invention does not need to be provided with a keyboard electrically connected to the key detection board, and the user can send instructions without touching the key detection board or the keyboard Regarding the key detection board, the key detection board of the present invention can work in high temperature or other extreme working environments.

And the button detection board provided by the present invention has a first detection key located on one side of the board body, the first detection key includes a plurality of sub-detection keys, and any sub-detection key is located on the surface of the board body The area is different from other sub-detection keys, which can reduce the difficulty of calculation when the processing chip calculates the ratio of the charge change amount and the charge balance amount in each charge accumulation area, and the key detection board of the present invention has a half-enclosed first detection key. the second detection key of the detection key, the second detection key can recognize the proximity of the user's finger through the change of the charge replenishment amount in the charge accumulation area corresponding to the second detection key, and identify the user's finger for the first detection key Tap to provide a reference, further reduce the calculation amount of the processing chip, and reduce power consumption.

Further, the key detection board of the present invention also has a third detection key surrounding any sub-detection key, and the third detection key can determine the invalid operation of the user, reducing the probability of misoperation of the key detection board of the present invention .

Description of drawings

FIG. 1 is a schematic diagram of an existing button;

2 is a schematic diagram of the first embodiment of the button detection board of the present invention;

Fig. 3 is a schematic diagram of an embodiment of a key detection board with an air partition between the first detection keys;

4 is a schematic diagram of an embodiment of a key detection board provided with a processing chip;

FIG. 5 is a schematic diagram of a second embodiment of the key detection board of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar extensions without departing from the connotation of the present invention. Accordingly, the present invention is not limited to the specific embodiments disclosed below.

The inventor of the present invention proposes the idea of an air touch button based on many defects of the existing capacitive touch screen and its identification methods. By constructing a special touch key structure so that when performing a touch operation, the operator's fingers do not need to touch the actual touch screen or keyboard. The buttons on the surface of the keyboard 10 are electrically connected to the detection keys on the detection board. The keys that touch the surface of the keyboard 10 can only be detected by the detection key through the electrical connection between the key and the detection key; and the air touch key proposed by the inventor of the present invention, the touch key does not need the user to be electrically connected to the detection key, according to When the user is close to the detection key, the charge distribution on the detection key is changed to sense the user's keystroke command; and, based on the touch key structure, a corresponding power supply method and a touch recognition method for the touch key structure are designed to detect the touch key. operations to be more accurately identified. The specific air touch button structure includes: a keyboard; a detection board, the detection board has a plurality of detection keys corresponding to the key positions of the keyboard, the detection board is insulated from the keyboard, and when in use When the user touches the keyboard or is close to the keyboard, corresponding to a trigger signal, the analysis test chip located on the detection board or connected to the detection board interface judges and analyzes the trigger signal, determines which button is triggered and triggers the corresponding function, and further Yes, the air touch button structure can be provided with a keyboard or not provided with a keyboard, and when a keyboard is provided, the keyboard is not electrically connected to the detection key of the detection board.

Specifically, the principle of button judgment is: the detection keys of the detection board are charged with a certain amount of charge, and the charge amount of each detection key can be the same or different; the detection keys form a charge accumulation area, when the user When approaching the detection key, change the ratio of the amount of charge change and the charge balance in the charge accumulation area corresponding to the detection key, and the detection key transmits the ratio to the analysis test chip connected to the detection key, and the analysis test chip judges Whether the user triggers the key.

To calculate the ratio of the charge change amount of the charge accumulation area corresponding to the detection key to the charge balance amount, the key corresponding to the charge accumulation area with the largest charge change amount and the largest charge change amount and charge balance amount ratio is identified as the touched key. For example, when the position of the key of the keyboard is facing the touch or close to the touch, charge is added to the charge accumulation area corresponding to the detection key until the charge amount in the charge accumulation area corresponding to each detection key reaches balance; Calculate the amount of charge supplement in the charge accumulation area of each charge accumulation area when the button position of the keyboard is facing the touch, and calculate the ratio of the charge change amount and the charge balance amount of each charge accumulation area; the charge change amount The key corresponding to the charge accumulation area with the largest charge change amount and the largest charge balance amount ratio is identified as the touched key.

However, it is found in the research that the detection board structure using the same size detection key has a large computational workload in the process of key judgment, the key recognition process is long, and the analysis and test chip has a large computational workload, which leads to analysis and testing. The chip consumes a lot of power and takes up a lot of memory.

For this reason, the inventor of the present invention proposes an optimized key detection board, comprising: a board body; a plurality of detection keys, and the detection keys include a first detection key located on one side of the board body , the first detection key includes a plurality of sub-detection keys, and the area of any sub-detection key located on the surface of the plate body is different from that of other sub-detection keys; the second detection key located on the side of the plate body, and The second detection key half surrounds the first detection key.

The board body is an ITO film, a conductive film, a printed circuit board or a flexible printed circuit board, and the board body also includes a metal wire located in the board body or on the surface of the board body and connected to the detection key. The metal wire is connected with the port of the detection key, and the port is used for connecting with the processing chip.

It should be noted that the key detection board of the present invention can be applied to air keys, and can also be applied to the prior art. The air type key refers to a key that the human body will not touch the detection key on the detection board.

Further, the button detection board of the present invention can also be used as a detection antenna for a processing chip, and the processing chip is arranged in the board body or connected to the board body through an interface arranged in the board body, and by selecting the material of the button detection board, Set the direction and thickness of the metal wires in the key detection board, the arrangement and thickness of the detection keys, and the arrangement of the ports, so that the key detection board can detect the frequency of the preset frequency band, and by selecting the material of the key detection board , set the direction and thickness of the metal wires located in the key detection board, the arrangement and thickness of the detection keys, and the arrangement of the ports, so that the user touches or approaches the detection key and fixes it at another preset frequency band, reducing the analysis chip. Analysis difficulty.

The button detection board of the present invention will be described in detail below in conjunction with a specific embodiment.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of the first embodiment of the button detection board of the present invention, including: a board body 100, and the board body 100 can be a printed circuit board or a flexible printed circuit board. In this embodiment, a printed circuit board is selected. The circuit board, the board body 100 is a flat cuboid, has a working surface I and an adjacent surface II, and the working surface I is adjacent to the adjacent surface II, and the working surface is usually parallel to the internal metal wiring of the printed circuit board The surface of the printed circuit board is generally formed by stacking multiple layers of media and wiring layers, and the working surface is parallel to the surface of the wiring layer of the printed circuit board and perpendicular to the stacking direction.

The detection key 110 is used to detect a user command (that is, the user touches or approaches it), and converts the user command into a working signal, and the working signal is transmitted to the processing chip (not shown) connected to the interface 119 through the metal wire 118, The detection key 110 is a thin metal sheet, preferably copper foil in this embodiment.

The detection key 110 includes: a first detection key located on one side of the board body 100. In this embodiment, the first detection key includes a plurality of discrete sub-detection keys to have The first detection key has a first sub-detection key 111, a second sub-detection key 112, a third sub-detection key 113, a fourth sub-detection key 114, a fifth sub-detection key 115, a sixth sub-detection key The sub-detection key 116 is used as an example for exemplary illustration. The area of any sub-detection key located on the surface of the board body 100 is different from that of other sub-detection keys. Wherein, the area of the first sub-detection key 111 located on the surface of the board body> The area of the second sub-detection key 112 located on the surface of the board>the area of the third sub-detection key 113 located on the surface of the board>the area of the fourth sub-detection key located on the surface of the board>the area of the fifth sub-detection key 115 located on the board The area of the body surface>the area where the sixth sub-detection key 116 is located on the surface of the board body; so that when the key detection board of this embodiment detects that the user touches the keyboard or approaches the keyboard, the electric charge corresponding to each sub-detection key is accumulated There will be a large difference in the amount of charge replenishment in the area. When the processing chip calculates the ratio of the charge change amount to the charge balance amount in each charge accumulation area, the ratio of the charge change amount to the charge balance amount of each sub-detection bond has a significant difference. The difference is that when the processing chip recognizes the button corresponding to the charge accumulation area with the largest charge change and the largest ratio of the charge change to the charge balance as the touched button, the recognition of each sub-detection button is quite different, and will not appear. misjudgment phenomenon.

Further, the first detection key in this embodiment is located on the working surface I and the adjacent surface II of the board body 100. Considering that the board body 100 is a flat cuboid, and the adjacent surface II is narrow and long, the detection key can be detected visually. The key 101 covers part of the adjacent surface II (edge wrapping). It should also be noted that in this implementation, the number of sub-detection keys of the first detection key is 6, corresponding to the start key, stop key, pause key, Fast forward key, rewind key and volume key, and in other embodiments, the number of sub-detection keys of the first detection key is not limited to 6, can be 2, 3, 4, 5, 7, 8, 9....32, the corresponding functions can also be set according to the scope of application of the key detection board, such as turning on and off the TV, channel selection; or turning on, stopping, and time setting of the microwave oven setting, temperature setting; or starting, stopping, and washing program selection of the washing machine; or computer keyboard input, such as Q, W, E, R, F1, Ctrl or Alt key functions, etc.

Still referring to FIG. 2, the detection key 110 further includes: a second detection key 117 located on the side of the board body 100, and the second detection key 117 half surrounds the first detection key. In an example, the second detection key 117 is located on the three sides of the board body 100 where the first detection key is not formed, half surrounds the first detection key, and the second detection key The key 117 is a thin metal sheet, preferably copper foil. It should be noted that the second detection key 117 is used to detect the proximity of the user's finger to the key detection board, that is, the user's finger is located on the surface or side of the key detection board. The second detection key 117 can identify the approach of the user's finger through the change of the charge replenishment amount in the charge accumulation area corresponding to the second detection key 117, and provide a reference for the first detection key to identify the touch or approach of the user's finger, further Reduce the calculation amount of the processing chip and reduce power consumption.

The board body 100 also includes metal wires 118 located in the board body 100 or on the surface of the board body 100 and connected to the first detection key and the second detection key 117. The port 119 connected to the first detection key and the second detection key 117 is used for connecting the processing chip.

Preferably, please refer to FIG. 3 , grooves are formed between each sub-detection key of the first detection key, that is, separated by air. Specifically, the board body 100 is in the shape of a "Great Wall" and has a body part 210 And the protruding part 220, the body part 210 is a flat cuboid, the protruding part 220 is the battlement of the Great Wall, the first detection key is located on the first surface and the second surface of the protruding part 220, and the first surface and the second surface The surfaces are two interconnected surfaces, and the first detection key is a thin metal sheet, preferably copper foil.

The preferred solution of this embodiment can further improve the recognition difference of each first detection key, that is, the difference of charge replenishment amount in the charge accumulation region corresponding to each first detection key is further improved.

It should also be noted that, please refer to FIG. 4 , a processing chip 200 may also be provided in the board body 100 , and when the processing chip 200 is directly provided on the board body 100 , the processing chip 200 is located at the same position as the first detection key. The opposite end of the board body 100, and the area of the first detection key located on the surface of the board body 100 is proportional to the distance between the first detection key and the processing chip 200, the first detection key The distance between the detection key and the processing chip 200 is the distance between the center position of the first detection key and the center position of the processing chip. Specifically, the first sub-detection key 111 has the largest area on the surface of the board body, and the first sub-detection key 111 has the largest area on the surface of the board body. The distance between the detection key 111 and the processing chip 200 is the farthest, the sixth sub-detection key 116 has the smallest area on the board surface, and the distance between the sixth sub-detection key 116 and the processing chip 200 is the shortest. Personnel can set each first detection key and the distance between the first detection key and the processing chip according to the actual application of the key detection board, but the area where the first detection key is located on the surface of the board body 100 is the same as the first detection key. When the distance between a detection key and the processing chip 200 is proportional, it is better to recognize the touch of the user's finger.

The inventor of the present invention also proposes an optimized key detection board. FIG. 5 is a schematic diagram of a second embodiment of the key detection board of the present invention, including: a board body 300; a plurality of detection keys 310, and the detection keys 310 Including, a first detection key located on one side of the board body 300, the first detection key includes a plurality of sub-detection keys (301-306), and any sub-detection key is located on the surface of the board body 300 The area is different from other sub-detection keys; the second detection key 312 located on the side of the board, and the second detection key 312 half surrounds the first detection key 311; the third detection key located on the surface of the board detection key 313, and any sub-detection key is surrounded by the third detection key 313.

Specifically, the board body 300 can refer to the first embodiment, the board body 300 can be a printed circuit board or a flexible printed circuit board, in this embodiment, a printed circuit board is selected, and the board body 300 is a flat rectangular parallelepiped , has a working surface I and an adjacent surface II, in this embodiment, the working surface I is the first surface, the adjacent surface II is the second surface, and the working surface I and the adjacent surface II are connected to each other, and the The working surface is usually a surface parallel to the internal metal wiring surface of the printed circuit board. The printed circuit board is usually formed by stacking multiple layers of media and wiring layers. The working surface is a surface parallel to the wiring layer of the printed circuit board. perpendicular to the stacking direction.

The detection key 310 is used to detect that the keyboard (not shown) receives a user command (that is, the user touches), and converts the user command into a working signal, and the working signal is transmitted to the processing chip 200 through the metal wire 318, so that The detection key 310 is a thin metal sheet, and in this embodiment, it is preferably copper foil.

The functions and settings of the first detection key 311 and the second detection key 312 in this embodiment can refer to the first embodiment. Similarly, when the surface of the board body 300 has a processing chip 200, the first detection key The area of the detection key 311 on the surface of the board body 300 is proportional to the distance between the first detection key and the processing chip 200 .

In this implementation, a third detection key 313 is additionally provided. The third detection key 313 is a thin metal sheet. In this embodiment, it is preferably copper foil. The third detection key 313 surrounds any detection key, the third detection key 313 is used to detect the actions of adjacent sub-detection keys, specifically, when the user's finger is placed between two adjacent sub-detection keys, it will also cause The difference in charge replenishment in the charge accumulation area corresponding to the two adjacent sub-detection keys, at this time, the processing chip is easy to be mistaken for the user's click, thus causing misoperation. For this reason, the third detection key 313 is set to surround any sub-detection key, and the third detection key 313 is electrically isolated from the sub-detection key. When the user's finger is placed between two adjacent sub-detection keys, the processing chip 200 will be The determination of the difference in the amount of charge replenishment in the charge accumulation area corresponding to the third detection key 313 is an invalid operation by the user, so as to prevent the processing chip from placing the user's finger on the two adjacent sub-detection keys when there is no third detection key cause misoperation.

The key detection board provided by the present invention does not need to be provided with a keyboard electrically connected to the key detection board, and the user can send instructions to the key detection board without touching the key detection board or the keyboard. The key detection board of the present invention The test board can work in high temperature or other extreme working environment.

And the button detection board provided by the present invention has a first detection key located on one side of the board body, the first detection key includes a plurality of sub-detection keys, and any sub-detection key is located on the surface of the board body The area is different from other sub-detection keys, which can reduce the difficulty of calculation when the processing chip calculates the ratio of the charge change amount and the charge balance amount in each charge accumulation area, and the key detection board of the present invention has a half-enclosed first detection key. the second detection key of the detection key, the second detection key can recognize the proximity of the user's finger through the change of the charge replenishment amount in the charge accumulation area corresponding to the second detection key, and identify the user's finger for the first detection key Tap to provide a reference, further reduce the calculation amount of the processing chip, and reduce power consumption.

Further, the key detection board of the present invention also has a third detection key surrounding any sub-detection key, and the third detection key can determine the invalid operation of the user, reducing the probability of misoperation of the key detection board of the present invention .

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can use the methods disclosed above and technical content to analyze the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made in the technical solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention, which do not depart from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.

Claims (8)

1. A button detection board, comprising: Board; It is characterized in that it also includes: A plurality of detection keys, the detection key includes a first detection key located on one side of the board, the first detection key includes a plurality of sub-detection keys, and any sub-detection key is located The surface area of the board is different from other sub-detection keys; the second detection key is located on the side of the board, and the second detection key half surrounds the first detection key. 2. The key detection board according to claim 1, wherein the board body further comprises a processing chip. 3. The key detection board according to claim 1 or 2, wherein the area of the first detection key on the surface of the board is proportional to the distance between the first detection key and the processing chip. 4. The button detection board according to claim 1, wherein the board body has a working surface and an adjacent surface adjacent to the working surface, and the first detection key is located on the working surface of the board body and adjacent. 5. The key detection board as claimed in claim 1, wherein there is an air partition between the first detection keys. 6 . The key detection board according to claim 1 , further comprising: a third detection key located on the surface of the board body, and any sub-detection key is surrounded by the third detection key. 7. The key detection board according to claim 6, wherein the third detection key is a thin metal sheet. 8 . The key detection board according to claim 7 , wherein the third detection key is connected to the processing chip through a metal wire, and the third detection key is used for judging an invalid operation by the user.

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