CN212463189U - Touch panel and switch assembly for touch panel - Google Patents
Touch panel and switch assembly for touch panel Download PDFInfo
- Publication number
- CN212463189U CN212463189U CN202020554675.1U CN202020554675U CN212463189U CN 212463189 U CN212463189 U CN 212463189U CN 202020554675 U CN202020554675 U CN 202020554675U CN 212463189 U CN212463189 U CN 212463189U
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- circuit board
- printed circuit
- flexible printed
- switch
- sensing resistor
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- 239000000758 substrate Substances 0.000 claims description 30
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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Abstract
The utility model relates to an input device of electronic system, in particular to touch pad and switch module thereof. In one or more embodiments of the present invention, a switch assembly includes: the flexible printed circuit board, the elastic switch disposed opposite to a first side of the flexible printed circuit board, the force sensing resistor disposed opposite to a second side of the flexible printed circuit board. The first side of the flexible printed circuit board is provided with a first conductive part and a second conductive part, the elastic switch is electrically connected with the second conductive part, and when the elastic switch deforms, the elastic switch is electrically connected with the first conductive part, so that the first conductive part and the second conductive part are electrically conducted.
Description
Technical Field
The present invention relates generally to input devices for electronic systems, and more particularly to a touch pad and a switch assembly for the touch pad.
Background
Input devices including touch panels are widely used in a variety of electronic systems. The touch pad may be integrated or external to the mobile communication device, notebook, laptop, or tablet computer as an input device. Touch pads typically contain a sensing region bounded by their surface for determining the presence, location, and/or movement of one or more input objects. The touch pad may also be used as a click pad to detect a click of a button through a mechanical switch or an electronic switch.
SUMMERY OF THE UTILITY MODEL
According to an aspect of the present invention, there is provided a touch panel and a switch assembly for the touch panel.
In one or more embodiments of the present invention, a switch assembly for a touch pad includes: the flexible printed circuit board comprises a flexible printed circuit board, wherein a first conductive part and a second conductive part are arranged on a first side of the flexible printed circuit board, and an elastic switch is arranged on the first side of the flexible printed circuit board and is electrically connected with the second conductive part.
Optionally, the resilient switch is a metal dome.
Optionally, the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is not deformed.
Optionally, the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is deformed.
Optionally, the force sensing resistor is screen printed on the second side of the flexible printed circuit board.
Optionally, the second conductive portion surrounds the first conductive portion in an annular shape.
In one or more embodiments of the present invention, a touch panel includes: a substrate, a switch assembly, wherein the switch assembly comprises: a flexible printed circuit board electrically connected to the substrate, a first conductive portion and a second conductive portion provided on a first side of the flexible printed circuit board,
the flexible printed circuit board comprises an elastic switch arranged opposite to a first side of the flexible printed circuit board, the elastic switch is electrically connected with the second conductive part, when the elastic switch deforms, the elastic switch is electrically connected with the first conductive part, so that the first conductive part and the second conductive part are electrically conducted, and a force sensing resistor is arranged opposite to a second side of the flexible printed circuit board, wherein the substrate is arranged opposite to the second side of the flexible printed circuit board, and the force sensing resistor is arranged between the substrate and the flexible printed circuit board.
Optionally, the flexible printed circuit board is fixed to the substrate by an adhesive.
Optionally, the adhesive annularly surrounds the force sensing resistor.
Optionally, the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is deformed.
Optionally, the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is not deformed.
In each aspect of the present invention, the sound generated when the elastic switch is pressed can be reduced by the flexible printed circuit board provided between the elastic switch and the substrate. Through the force sensing resistor arranged on one side of the flexible printed circuit board, additional pressure sensing can be provided for the pressing of the elastic switch, so that the elastic switch can detect different levels of force applied to the elastic switch when the elastic switch is deformed or is not deformed.
Drawings
Other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the various aspects taken in conjunction with the accompanying drawings.
Fig. 1 illustrates a schematic diagram of a switch assembly for a touch pad according to one embodiment of the present invention.
Fig. 2A and 2B are schematic diagrams of a flexible printed circuit board in a switch assembly according to an embodiment of the present invention.
Fig. 3A and 3B are cross-sectional views of a switch assembly in accordance with an embodiment of the present invention.
Detailed Description
The invention is described below with reference to the exemplary drawings of embodiments of the invention. The present invention is not limited to only the embodiments presented herein. The embodiments are presented to enable a more complete and accurate understanding of the scope of the present invention.
Throughout the specification, it will be understood that terms such as "comprising" and "comprises" mean that there are no elements or steps explicitly recited in the specification or claims, but rather there are no means for precluding the presence of other elements or steps which are not explicitly or explicitly recited. Terms such as "first" and "second" do not denote an order of the elements in time, space, size, etc., but rather are used to distinguish one element from another. Terms such as "a is located between B and C" include both the case where the surfaces of a and B or a and C are in direct contact, and the case where there are other objects between a and B or a and C. Terms such as "A is on" B, "" A is connected to "B, mean that A may be" directly on "B," directly "connected to" B, or there may be other elements intervening.
For convenience in description, spatially relative terms (e.g., "above … …," "above," "below … …," and "below," etc.) may be used herein to describe one element's relationship to another element as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other elements or features would then be oriented "below" or "beneath" the other elements or features. Thus, the term "above … …" may encompass both an orientation of "above … …" and "below … …" depending on the particular orientation of the figure.
Hereinafter, embodiments will be described with reference to schematic drawings showing the embodiments. Thus, embodiments should not be construed as limited to the particular shapes and dimensional proportions of the regions illustrated herein.
Fig. 1 shows a schematic diagram of a switch assembly for a touch pad. As shown in fig. 1, the touch pad may include a support 150, a switch assembly 110, a substrate 140, and a substrate 160. The switch assembly 110 and 140 are positioned between the bracket 150 and the substrate 160. The bracket 150 provides a support frame for the switch assembly 110 and 140 and the substrate 160. The substrate 160 may be a Printed Circuit Board (PCB). The switch assembly may include an elastic switch 110, a flexible printed circuit board (FPC)120, a fixing layer 130, and a force sensing resistor 140 in order from a support 150 to a substrate 160 as shown. The elastic switch 110 is disposed between the holder 150 and a flexible printed circuit board (FPC)120, and the flexible printed circuit board (FPC)120 is fixed to the substrate 160 through a fixing layer 130. A Force Sensing Resistor (FSR)140 is disposed between the flexible printed circuit board (FPC)120 and the substrate 160.
The resilient switch 110 provides a click function and tactile feedback. In one example, the resilient switch 110 may be a metal dome. The elastic switch 110 provides a click feel when deformed upon depression. A flexible printed circuit board (FPC)120 is electrically connected to the substrate 160 by soldering through gold fingers. Preferably, the flexible printed circuit board (FPC)120 is adhered to the substrate 160 by a gold finger through an Anisotropic Conductive Film (ACF). The fixing layer 130 is adapted to fix a flexible printed circuit board (FPC)120 to the substrate 160. In one example, the securing layer 130 is an adhesive. As exemplarily shown in fig. 1, the adhesive may be disposed in a ring shape on the lower surface of a Flexible Printed Circuit (FPC) 120. The Force Sensing Resistor (FSR)140 is made of a conductive polymer having the property of changing its resistance in accordance with the force applied on its surface. The Force Sensing Resistor (FSR)140 is typically provided in the form of a polymer sheet or ink and is screen-printed on the surface of the lower side of the flexible printed circuit board.
Fig. 2A and 2B are schematic diagrams of a flexible printed circuit board FPC in a switch assembly according to an embodiment of the present invention. Fig. 2A is a schematic front view of a flexible printed circuit board 220. Fig. 2B is a schematic rear view of the flexible printed circuit board 220. As shown, one side surface of the flexible printed circuit board 220 forms a first conductive portion 221 and a second conductive portion 223. The first conductive part 221 may be a general purpose input/output (GPIO) part, and the second conductive part 223 may be a GND part. In this example, the second conductive portion 223 annularly surrounds the first conductive portion 221. It is understood that GND and GPIO may also be provided in other patterns. The other side surface of the flexible printed circuit board 220 is provided with a Force Sensing Resistor (FSR) 240. The Force Sensing Resistor (FSR)240 is typically provided in the form of a polymer sheet or ink, in this example the Force Sensing Resistor (FSR)240 is screen printed with ink on the surface of the other side of the flexible printed circuit board. This embodiment illustrates an arrangement of Force Sensing Resistors (FSRs) 240 that are circular and located at the geometric center of the circular body of the flexible printed circuit board 220, corresponding to the location of the GPIO sections on the other side of the flexible printed circuit board 220. An adhesive (not shown) as the fixing layer 130 may be disposed in a ring shape on the back surface of the flexible printed circuit board 220, and the Force Sensing Resistor (FSR)240 may be located just inside the ring shape of the adhesive.
Fig. 3A and 3B are cross-sectional views of a switch assembly in accordance with an embodiment of the present invention. Fig. 3A is a schematic diagram of the switch assembly of the embodiment when the elastic switch is not deformed. Fig. 3B is a schematic diagram of the switch assembly according to the embodiment when the elastic switch is deformed. As shown, the switch assembly includes a resilient switch 310, a flexible printed circuit board 320, a force sensing resistor 340. The elastic switch 310 is disposed below the flexible printed circuit board 320, and the force sensing resistor 340 is disposed above the flexible printed circuit board 320. A first side of the flexible printed circuit board 320, i.e., the same side as the elastic switch 310, is provided with a first conductive part 321 and a second conductive part 323. The second conductive portion 323 surrounds the first conductive portion 321 in a ring shape, and the first conductive portion 321 is located in the ring shape. The peripheral portion of the elastic switch 310 is fixed to the second conductive portion 323 to form an electrical connection therebetween. On a second side of the flexible printed circuit board 320, a force sensing resistor 340 is disposed. The force sensing resistor 340 may be disposed at the center of the flexible printed circuit board 320 body and aligned with the first conductive portion 321. Around the force sensing resistor 340, an adhesive 330 may be disposed on a second side surface of the flexible printed circuit board 320 for fixing the flexible printed circuit board 320 to the substrate 360. Fig. 3A and 3B show the direction of the force. When the substrate 360 is pressed and when the pressure exceeds a threshold, the elastic switch 310 deforms. The central portion of the elastic switch 310 is bent to electrically connect with the first conductive portion 321, so that the first conductive portion 321 and the second conductive portion 323 are electrically connected to make the circuit loop in a closed state, as shown in fig. 3B. The resilient switch may be a metal dome adapted to provide tactile feedback to the user.
Since the force sensing resistor 340 is disposed at the second side of the flexible printed circuit board 320, the force sensing resistor 340 may sense a force applied thereto when the substrate 360 is pressed. In embodiments of the present invention, the force sensing resistor 340 is adapted to sense the force applied to the force sensing resistor when the elastic switch 310 is not deformed, and/or adapted to continue to sense the force applied to the force sensing resistor when the elastic switch 310 is deformed. By providing a force sensing resistor, different forces exerted on the resilient switch 310 can be sensed.
The touch panel according to the embodiment includes an elastic switch 310, a flexible printed circuit board 320, a force sensing resistor 340, and a substrate 360. The flexible printed circuit board 320 is electrically connected to the substrate 360. The substrate 360 is disposed opposite a second side of the flexible printed circuit board 320, and the force sensing resistor 340 is disposed intermediate the substrate 360 and the flexible printed circuit board 320. The flexible printed circuit board 320 is fixed to the substrate 360 by an adhesive 3340.
While certain aspects of the present invention have been shown and discussed, those skilled in the art will appreciate that: changes may be made in the above aspects without departing from the principles and spirit of the invention, the scope of which is, therefore, defined in the appended claims and their equivalents.
Claims (11)
1. A switch assembly for a touch pad, comprising:
a flexible printed circuit board having a first conductive portion and a second conductive portion disposed on a first side of the flexible printed circuit board,
an elastic switch disposed opposite to the first side of the flexible printed circuit board, the elastic switch being electrically connected to the second conductive part, wherein when the elastic switch is deformed, the elastic switch is electrically connected to the first conductive part, so that the first conductive part and the second conductive part are electrically connected, and
a force sensing resistor disposed opposite a second side of the flexible printed circuit board.
2. The switch assembly of claim 1,
the resilient switch is a metal dome.
3. The switch assembly of claim 1,
the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is not deformed.
4. The switch assembly of claim 1 or 3,
the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is deformed.
5. The switch assembly of claim 1,
the force sensing resistor is screen printed on the second side of the flexible printed circuit board.
6. The switch assembly of claim 1,
the second conductive portion surrounds the first conductive portion in an annular shape.
7. A touch panel, comprising:
a substrate, a first electrode and a second electrode,
a switch assembly, wherein,
the switch assembly includes:
a flexible printed circuit board electrically connected to the substrate, having a first conductive portion and a second conductive portion provided on a first side of the flexible printed circuit board,
the elastic switch is electrically connected with the second conductive part relative to the elastic switch arranged on the first side of the flexible printed circuit board, when the elastic switch deforms, the elastic switch is electrically connected with the first conductive part, so that the first conductive part and the second conductive part are electrically conducted,
a force sensing resistor disposed opposite a second side of the flexible printed circuit board,
wherein the substrate is disposed opposite a second side of the flexible printed circuit board, the force sensing resistor being disposed intermediate the substrate and the flexible printed circuit board.
8. The touch pad of claim 7,
the flexible printed circuit board is fixed to the substrate by an adhesive.
9. The touch pad of claim 8,
the adhesive is annular and surrounds the force sensing resistor.
10. The touch pad of claim 7,
the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is deformed.
11. The touch pad of claim 7,
the force sensing resistor is adapted to sense a force applied to the force sensing resistor when the resilient switch is not deformed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020554675.1U CN212463189U (en) | 2020-04-15 | 2020-04-15 | Touch panel and switch assembly for touch panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020554675.1U CN212463189U (en) | 2020-04-15 | 2020-04-15 | Touch panel and switch assembly for touch panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212463189U true CN212463189U (en) | 2021-02-02 |
Family
ID=74473200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020554675.1U Active CN212463189U (en) | 2020-04-15 | 2020-04-15 | Touch panel and switch assembly for touch panel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212463189U (en) |
-
2020
- 2020-04-15 CN CN202020554675.1U patent/CN212463189U/en active Active
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