TW201703090A - Capacitive sensitive key structure wherein static electricity is changed due to the change in the distance between a conductive part and a sensor layer - Google Patents

Abstract

A capacitive sensitive key structure includes a key, a support element, a mounting pad, a substrate and a conductive part. The key includes a key body and a connecting wall for enclosing a receiving space. The support element is located in the receiving space and includes a body, a conical wall, a buffer space, and a cushion formed at one end of the conical wall. The body has a top abutted against the bottom of the key body. The conductive part is located at the bottom of the body and arranged in the buffer space. The substrate is connected to one side of the mounting base and provided with a circuit unit and a sensor layer. The substrate is coated with an insulating varnish layer for at least covering the sensor layer. When the key body is pressed and moved against the support element, static electricity is changed due to the change in the distance between the conductive part and the sensor layer. Consequently, the circuit unit transmits electrical signals to drive and operate an electronic device.

Description

Capacitive sensing button structure

The present invention relates to a button, and more particularly to a capacitive sensing button structure that utilizes capacitive sensing of electrostatic changes and provides a sense of contact feedback.

Press, the start-up operation of any equipment or electronic product must be controlled by a button. By pressing the button, the circuit can drive the connected machine or electronic product to control the function of the machine or electronic product.

The conventional button is mostly mechanical, and includes a cap, a button portion and a circuit board. The circuit board is disposed under the key portion, and the cap is sleeved on the key portion. The key portion is internally provided with an elastic component and an inductive component. a metal layer is disposed on the corresponding key portion of the circuit board. Once the key portion is pressed, the elastic member is pressed and deformed to move the key portion downward, and the sensing element directly contacts the metal layer on the circuit board to make the key portion and the circuit board. The electrical connection is turned on, and the circuit board generates corresponding telecommunications according to the circuit driven by the key, thereby starting or controlling the implement or the electronic product, wherein the displacement of the key portion provides a feeling of pressing feedback when the finger is pressed. However, the key portion of the conventional mechanical button and the surface of the circuit board or the keyboard housing are spaced apart from each other, and the external moisture may penetrate into the interior of the key portion and the circuit board from the interval, which may easily cause oxidation of the metal layer on the circuit board. However, the electrical contact with the contact terminals of the key contacts is ineffective. In addition, the cap of the conventional machine-connected button is made of a hard material and is easily embrittled and damaged. However, with the development of touch technology, the touch screen can also be used as a touch keyboard. As is well known, the touch surface of the touch keyboard is a flat panel, which can prevent moisture from entering the inside of the panel, and can be touched to achieve telecommunications transmission. However, the touch buttons cannot provide the actual touch of the button. The paragraph sense feedback, so whether the correct touch of the button is not known, and because there is no physical separation between the button keys, it is very easy to touch the surrounding buttons, resulting in wrong control; The buttons on the control panel can be equipped with vibration components to provide vibration feedback after touch. However, the construction of the vibration components greatly increases the manufacturing cost, and it cannot solve the problem of correct touch to the required buttons and the false touch without physical separation. problem.

An object of the present invention is to provide a capacitive inductive button structure for controlling an application device by using an induced electrostatic change to drive a circuit, and coating a material on the circuit substrate to protect and avoid oxidation of the circuit substrate line and the sensing layer. .

Another object of the present invention is to provide a capacitive inductive button structure that provides a sense of contact feedback when a button is pressed, and the button maintains a straight up, straight, angularly consistent displacement.

To achieve the foregoing objective, the capacitive sensing type button structure of the present invention comprises at least one button, which comprises a key body and a connecting wall connected to the key body. The connecting wall is deformed by the pressing of the key body to displace the key body. A fixing pad is connected to the connecting wall, and the fixing pad is provided with a through hole corresponding to the key body, and penetrates the fixing pad. A substrate is connected to one side of the fixing pad. The substrate is provided with a circuit unit and a sensing layer corresponding to the through hole, and the sensing layer is coupled to the circuit unit. a conductive portion is disposed between the bottom of the key body and the substrate, and corresponds to the upper portion of the sensing layer. When the key body is pressed and displaced to drive the conductive portion to move a predetermined distance from the sensing layer, A change in static electricity is generated between the conductive portion and the sensing layer, causing the circuit unit to emit a signal for driving the function of an electronic device.

According to an embodiment of the invention, the substrate is coated with an insulating lacquer layer covering at least the sensing layer.

According to one embodiment of the present invention, the connecting wall of the key body surrounds an accommodating space, and the button further includes a supporting component disposed in the accommodating space and including a body and a cone extending from the body a shaped wall, a buffer space formed in the conical wall, and a spacer formed at one end of the conical wall, the spacer being attached to the substrate, the top surface of the body abutting the key The bottom surface of the body is provided with the conductive portion on the bottom surface of the body, and is located in the buffer space.

According to another embodiment of the present invention, the capacitive sensing button structure further includes at least one light emitting component electrically connected to the substrate, and the light source of the light emitting component can be displayed outside through the key body.

The capacitive inductive button structure of the present invention utilizes electrostatic changes between the conductive portion of the conductive silicone and the sensing layer of the substrate, so that the key body can drive the circuit unit to generate telecommunications without directly contacting the substrate, and the substrate is coated with an insulating lacquer layer to avoid The sensing layer and circuit unit are oxidized and damaged. In addition, the arrangement of the conical wall of the supporting member provides that when the button is pressed at any position on the top thereof, the movement of the key body can be maintained straight and straight, and the displacement of the angle is not caused, so that the capacitive inductive button structure of the present invention The conductive element that effectively solves the traditional button must be directly in contact with the circuit board to conduct electricity, can not be coated with solder resist paint, easily damages the surface circuit, and improves the problem that the traditional touch button cannot provide the feedback feeling, and does not shift due to different angles of the button. Causes the problem of inaccurate pressing.

1‧‧‧Capacitive inductive button structure
2‧‧‧ buttons
20‧‧‧ accommodating space
21‧‧‧Key body
211‧‧‧ positioning slot
212‧‧‧Fixed holes
22‧‧‧Connecting wall
23‧‧‧Fixed mat
230‧‧‧through hole
24‧‧‧ platform
241‧‧‧ curved surface
242‧‧‧Limited Movies
25‧‧‧Positioning column
3‧‧‧Support components
30‧‧‧Electrical Department
31‧‧‧Ontology
310‧‧‧ Groove
32‧‧‧Conical wall
320‧‧‧ buffer space
33‧‧‧shims
4‧‧‧Insulating paint layer
5‧‧‧Substrate
5‧‧‧Sense layer 1
52‧‧‧ circuit unit
53‧‧‧ positioning channel
6‧‧‧Lighting elements
7‧‧‧ panel
d‧‧‧Predetermined distance

The first figure is a perspective exploded view of the capacitive sensing type button structure of the present invention.
The second figure is a partial perspective view of the bottom view angle of the capacitive sensing type button structure of the present invention.
The third figure is a three-dimensional combination diagram of the first figure.
The fourth figure is a perspective view of the upward viewing angle of the button of the present invention.
The fifth figure is a schematic cross-sectional view of the button of the present invention.
The sixth figure is a schematic diagram of the cross-section actuation of the button of the fifth figure.
The seventh figure is a perspective view of another embodiment of the capacitive sensing type button structure of the present invention.
The eighth figure is a bottom perspective view of the button of the seventh figure.
The ninth drawing is a schematic plan view of the eighth figure.
The tenth figure is a schematic cross-sectional view of the 10-10 line of the ninth figure.
The eleventh figure is a schematic cross-sectional view of the line 11-11 of the ninth figure.
The twelfth figure is a schematic diagram of a specific implementation of the capacitive sensing type button structure of the present invention.

Please refer to the first to sixth figures for the best implementation of the capacitive inductive button structure of the present invention. The capacitive inductive button structure 1 of the present invention can drive an electronic device or implement (not shown) via touchdown. For example, the capacitive sensing button structure 1 includes at least one button 2, a supporting member 3, a fixing pad 23 and a substrate 5. In this embodiment, the capacitive inductive button structure 1 includes a plurality of buttons 2 for controlling and executing different functions of the electronic device. Each of the buttons 2 includes a key body 21 and a connecting wall 22 connected to the key body 21. The connecting wall 22 is integrally connected to a fixing pad 23, and the connecting wall 22 surrounds an accommodating space 20, and the key body 21 is a Rectangular. The fixing pad 23 is provided with a through hole 230 (shown in the second figure) corresponding to the surface of the fixing pad 23 corresponding to the key body 21. In this embodiment, the fixing pads 23 of the plurality of buttons 2 are integrally connected to each other, so that the fixing pads 23 are formed into an integrally formed whole sheet shape, and the sheet-shaped fixing pads 23 are flatly fixed on the substrate 5 (for example). The third picture shows). The circuit board 5 is provided with a circuit unit 52 and a sensing layer 51 (as shown in the first figure) corresponding to the through hole 230. The sensing layer 51 is coupled to the circuit unit 52 and disposed corresponding to the conductive portion 30. The circuit unit 52 includes a plurality of integrated circuits which are previously provided with a circuit layout corresponding to the function of each of the keys 2.

The key body 21 and the connecting wall 22 are made of a rubber material, and the key body 21 is solid and has a thickness. The center of the bottom of the key body 21 is further formed with a positioning groove 211 which communicates with the accommodating space 20. The accommodating space 20 is surrounded by the connecting wall 22 so that the outside water gas cannot enter the button 2. Specifically, the accommodating space 20 of the key body 21 is further provided with the supporting member 3, which can be used for supporting the key body 21. In other words, the connecting wall 22 of the key body 21 is used for connecting the key body 21 and the fixing pad. 23, while the support of the key body 21 mainly depends on the support member 3 instead of the connecting wall 22. The support member 3 includes a body 31, a conical wall 32 extending from the body 31, a buffer space 320 formed in the conical wall 32, and a spacer 33 formed at the bottom end of the conical wall 32. The sheet 33 extends out of the conical wall 32 for attaching to the substrate 5, so that the supporting member 3 can form a large contact area on the substrate 5 for the purpose of fixing, wherein the bottom surface of the spacer 33 is flush and fixed. The bottom surface of the pad 23. The top of the body 31 is embedded in the positioning groove 211 of the key body 21, and the supporting member 3 is fixed on the substrate 5 through the key body 21; since the body 31 is embedded in the center of the bottom of the key body 21, the top surface of the key body 21 The force at any place can be transmitted to the body 31 equally. In addition, the bottom surface of the body 31 is provided with a conductive portion 30, which is located in the buffer space 320. The conductive portion 30 is an annular sheet and is made of conductive silicone. In particular, the conical wall 32 is formed by expanding the diameter of the body 31 toward the substrate 5, and the height of the connecting wall 22 of the key body 21 is equal to or greater than the height of the conical wall 32 to provide sufficient space for the supporting member 3. And the connecting wall 22 extends obliquely outward to the fixing pad 23, and the inclined configuration facilitates the deformation of the connecting wall 22 (described later) to prevent the life of the connecting wall 22 from being extended.

In a specific implementation, the substrate 5 is electrically connected to the through-hole 230 at the second light-emitting element 6 , which may be a light-emitting diode. In this implementation, the periphery of the light-emitting element 6 is surrounded by an annular sensing layer 51 corresponding to the annular conductive portion 30 at the bottom of the body 31 of the support member 3. The bottom of the body 31 is further formed with a recess 310 surrounding the annular conductive portion 30. The recess 310 can cover the light-emitting element 6 in the recess 310 when the body 31 is displaced. When the body 31 is pressed down by the key body 21, the groove 310 is covered outside the light-emitting element 6, so that the thickness of the entire support member 3 to be evaded by the light-emitting element 6 can be reduced. In this implementation, the support member 3, the key body 21 and the connecting wall 22 are permeable to light, so that the light source emitted from the light-emitting element 6 can be displayed and scattered through the key body 21 for external recognition. The light-emitting element 6 can be set to emit light when the substrate 5 is energized, or can be illuminated when the button is pressed until the circuit unit 52 generates telecommunications.

The bottom surface of the conductive portion 30 and the sensing layer 51 are spaced apart from each other by at least greater than 1.5 mm before the body 31 is uncompressed, and the spacing depends on the structural height of the support member 3. Specifically, the substrate 5 is coated with an insulating varnish layer 4 which completely covers the sensing layer 51 and the circuit unit 52. The insulating varnish layer 4 has an insulating property, which is coated on the metal sensing layer 51 to prevent it. Oxidation prevents the oxidation of the sensing layer 51 and affects the effect of conduction. Further, the application of the insulating varnish layer 4 further functions to protect the substrate 5 and the sensing layer 51 so that the foreign object cannot directly contact the surface of the substrate 5.

With the above configuration, when the capacitive sensing type button structure 1 of the present invention is used, the top of the key body 21 is pressed with a finger, and the key body 21 is forced to cause the connecting wall 22 to be bent and deformed, and the key body 21 is moved downward while being pressed. The body 31 of the support member 3 is deformed by the force of the conical wall 32, causing the body 31 to move downward. At this time, the distance between the annular conductive portion 30 and the sensing layer 51 of the substrate 5 is changed when the interval reaches a predetermined distance d ( As shown in the sixth figure, that is, less than 0.5 mm, the capacitance between the conductive portion 30 and the sensing layer 51 changes, and the electrostatic field changes, so that the circuit unit 52 of the substrate 5 emits a telecommunication and transmits it to the controlled electronic device. And in turn drive the function of the electronic device. In other words, when the conductive portion 30 and the sensing layer 51 are within a predetermined distance d of less than 0.5 mm, the button 2 then triggers the circuit unit 52 to emit a telecommunication.

It can be seen from the foregoing description that the capacitive inductive button structure 1 of the present invention utilizes the conical wall 32 of the support member 3 as the main structure for the force deformation, and the circular peripheral surface of the conical wall 32 is uniform in curvature due to the respective portions, and can be used when subjected to force. A uniform deformation is generated, thereby ensuring that the key body 21 can be actuated straight up and down, avoiding the pressing feedback that causes the corners to be inclined.

Please refer to the seventh embodiment to the twelfth embodiment for the second embodiment of the capacitive sensing type button structure 1 of the present invention. The biggest difference between this embodiment and the previous embodiment is that the supporting element 3 is not provided, and the other is the same as the previous implementation. The construction of the example is not repeated. The capacitive inductive button structure 1 of the present embodiment includes a button 2, a fixing pad 23, a conductive portion 30, a substrate 5, and a platform 24. The connecting wall 22 of the key body 21 is integrally formed on the bottom of the key body 21, and the self-key body 21 The periphery of the bottom portion extends obliquely outward to the through hole 230, and is integrally connected to the fixing pad 23, in other words, the connecting wall 22 is disposed around the bottom of the key body 21. In addition, the arrangement of the conductive portion 30 of the second embodiment is different from that of the first embodiment. Specifically, one side of the corresponding substrate 5 of the key body 21 is provided with a conductive portion 30, which is formed by a plurality of conductive film films, and is inductively formed. The layer 51 is provided corresponding to the conductive portion 30.

Continuing to refer to the seventh to eleventh drawings, the configuration of the button 2 of the embodiment has a specific function. Specifically, the key body 21 has a rectangular shape, and a platform 24 is respectively disposed on opposite sides thereof. Extending outward from a lower intermediate position of the side surface of the key body 21, and forming a curved surface 241 from opposite corners of the side surface for increasing the angle of the four corners of the rectangular key body 21 connected to the four sides And strengthening the side structure of the key body 21 to prevent the top of the key body 21 from being pressed to cause displacement of the non-uniform angle of the key body 21; in other words, if the simple rectangular key body 21 does not have the structure of the platform 24, the key body 21 After the corners are pressed, the key body 21 is inclined to be inclined downwardly, and the pressing feedback of the button 2 is not accurate; in contrast, the side structure of the platform 24 can be pressed when the key body 21 is pressed. The force is transmitted to the platform 24, and the displacement of the angle change of the button 2 is prevented, thereby providing a true feeling of pressing feedback of the hand. In addition, a periphery of the bottom of the key body 21 is respectively provided with a limiting piece 242 having a thickness smaller than the thickness of the conductive portion 30, and the limiting piece 242 is located between the conductive portion 30 and the connecting wall 22. When the side of the key body 21 is continuously pressed, the limiting piece 242 abuts against the substrate 5, so that the key body 21 is not excessively deformed due to excessive pressing, and the conductive portion 30 can be protected from being damaged by overvoltage. .

Referring to the eighth and tenth views, the opposite sides of the bottom of the key body 21 are respectively provided with a fixing hole 212 between the mutually spaced conductive portions 30, and a positioning post 25 is inserted therein, and the positioning post 25 is inserted. Extending out the bottom of the key body 21. Each of the positioning posts 25 is provided with a positioning channel 53. The positioning post 25 is embedded in a portion of the positioning channel 53 when the key body 21 is not pressed, to provide further positioning of the key body 21 and the substrate 5. When the body 21 is pressed and displaced, the positioning post 25 moves in the positioning channel 53 to achieve the positioning effect, and at the same time, the force of the key body 21 is transmitted to the substrate 5, and the action of the key body 21 is straightened straight down.

When the capacitive sensing type button structure 1 of the second embodiment is used, the top of the key body 21 is also pressed by the finger, and the force of the key body 21 is transmitted to the platform 24 to the connecting wall 22, causing the connecting wall 22 to be deformed, and the driving key is driven. The body 21 is moved downward. At this time, the distance between the conductive portion 30 composed of a plurality of sheets and the sensing layer 51 of the substrate 5 is changed. When the interval reaches a predetermined distance d (as shown in the seventh figure), that is, less than 0.5 mm. The capacitance between the conductive portion 30 and the sensing layer 51 changes, and the electrostatic field changes, so that the circuit unit 52 of the substrate 5 sends a telecommunication and transmits it to the controlled electronic device, thereby driving the function of the electronic device, the key body. The platform 24 of the two sides 21 is used to increase the angle of the four corners of the connecting wall 22 connected to each other to prevent the angle deformation of the key body 21 from being deformed, and the internal limiting piece 242 prevents the angle deformation of the key body from being pressed. And the positioning post provides a further positioning function. The positioning post 25 provides a further positioning function and the positioning of the key body 21 when the key body 21 is pressed, so that the key body 2 can be straight up and down.

Referring to FIG. 12, the fixing pad 23 of the capacitive sensing type button structure 1 of the present invention can be covered with a panel 7 to further protect the substrate 5.

In summary, the capacitive inductive button structure 1 of the present invention utilizes electrostatic changes between the conductive portion 30 of the conductive silicone and the sensing layer 51 of the substrate 5, so that the key body 21 can drive the circuit unit 52 to generate telecommunications without directly contacting the substrate 5. The insulating lacquer layer 4 is coated on the substrate 5 to prevent oxidation and damage of the sensing layer 51 and the circuit unit 52. In addition, the arrangement of the conical wall 32 of the support member 3 provides that when the button 2 is pressed at any position on the top thereof, the movement of the key body 21 can be maintained straight and straight, without causing a displacement of different angles. The inductive button structure 1 effectively solves the problem that the conductive elements of the conventional button must be directly in contact with the circuit board, can not be coated with the solder resist, easily damage the surface circuit, and improve the problem that the conventional touch button cannot provide the feedback feeling, and will not The problem of pressing is not correct due to the different angular displacement of the buttons.

The above detailed description is intended to be illustrative of a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are intended to be included in the scope of the patents covered by the present invention.

1‧‧‧Capacitive inductive button structure

2‧‧‧ buttons

21‧‧‧Key body

23‧‧‧Fixed mat

3‧‧‧Support components

31‧‧‧Ontology

32‧‧‧Conical wall

33‧‧‧shims

4‧‧‧Insulating paint layer

5‧‧‧Substrate

51‧‧‧Sense layer

52‧‧‧ circuit unit

6‧‧‧Lighting elements

Claims (11)

A capacitive inductive button structure comprising:
At least one button includes a key body and a connecting wall connected to the key body, and the connecting wall is deformed by the pressing of the key body to displace the key body;
a fixing pad is connected to the connecting wall, and the fixing pad is provided with a through hole corresponding to the key body, which penetrates the fixing pad;
a substrate is connected to one side of the fixing pad, the substrate is provided with a circuit unit and a sensing layer corresponding to the through hole, the sensing layer is coupled to the circuit unit; and a conductive portion is disposed at the bottom of the key body Between the substrate and corresponding to the sensing layer, when the key body is pressed and displaced to drive the conductive portion to move and is spaced apart from the sensing layer by a predetermined distance, static electricity is generated between the conductive portion and the sensing layer. The change causes the circuit unit to emit a telecommunication to drive the function of an electronic device. The capacitive inductive button structure of claim 1, wherein the substrate is coated with an insulating lacquer layer covering at least the sensing layer. The capacitive inductive button structure of claim 1, wherein the connecting wall of the key body surrounds an accommodating space, the button further includes a supporting component disposed in the accommodating space and including a a body, a conical wall extending from the body, a buffer space formed in the conical wall, and a spacer formed at one end of the conical wall, the spacer being attached to the substrate, the spacer The top surface of the body abuts against the bottom of the key body, and the bottom surface of the body is provided with the conductive portion, which is located in the buffer space. The capacitive inductive button structure of claim 3, wherein the height of the connecting wall of the key body is equal to or greater than the height of the conical wall, such that the supporting element is pressed by the key body, the conical shape The wall is deformed to cause the body to be displaced toward the substrate. The capacitive inductive button structure of claim 3, wherein the bottom of the key body is further formed with a positioning groove, and one end of the body of the supporting component is embedded and fixed in the positioning groove, and the conical wall is The body extends in a diameter-expanding direction toward the substrate. The capacitive inductive button structure of claim 3, wherein the bottom surface of the fixing pad is flush with the bottom surface of the gasket of the tapered ring wall. The capacitive inductive button structure of claim 3, further comprising at least one light emitting component electrically connected to the substrate and located in a buffer space of the supporting component, wherein the light source of the light emitting component can transmit The key body and the support member are displayed outside. The capacitive inductive button structure of claim 7, wherein the bottom of the body of the supporting member is further formed with a groove corresponding to the light emitting element, and the light emitting element is covered when the body is displaced. In the groove. The capacitive inductive button structure of claim 1, wherein the predetermined distance between the conductive portion and the sensing layer is less than 0.5 mm. The capacitive inductive button structure of claim 1, wherein at least two opposite sides of the key body are respectively provided with a platform, and the opposite corners of the side of the key body extend outward to form an arc. The surface is used to prevent the key body from being pressed to cause a different angular displacement. The capacitive inductive button structure of claim 1, wherein at least one limiting piece is disposed around the bottom of the key body, and has a thickness smaller than a thickness of the conductive portion, when the edge of the key body is When continuously pressed, the limiting piece abuts against the substrate, so that the key body is not excessively deformed due to excessive pressing.