TWI713896B - Membrane switch device and keyboard device - Google Patents

Abstract

A membrane switch device includes a first membrane layer, a second membrane layer, a spacer, and a flexible printed circuit. The first membrane layer includes a first surface and a plurality of first conductive lines. These first conductive lines disposed on the first surface and extends to a first line region to form a plurality of first contact pads. The second membrane layer includes a second surface and a plurality of second conductive lines. These second conductive lines disposed on the second surface and extends to a second line region to form a plurality of second contact pads. The spacer is interposed between the first membrane layer and the second membrane layer. The terminal of the flexible printed circuit is interposed between a first outgoing area of the first membrane layer and a second outgoing area of the second membrane layer, and a first protective layer of the flexible printed circuit and the first contact pads do not overlap each other, and a second protective layer of the flexible printed circuit and the second contact pads do not overlap each other.

Description

Membrane switch device and keyboard device

The invention relates to a switch device, in particular to a membrane switch device and a keyboard device.

Due to their small size, thin thickness, and light weight, membrane switches have been widely used in various electronic products (such as keyboards) in recent years to meet the current trend of thinner and lighter development. Generally speaking, membrane switches are mostly connected to the system circuit boards of electronic products via a flexible printed circuit (FPC) to transmit signals to each other.

As shown in Figure 1, it is a schematic cross-sectional view of a conventional membrane switch. The conventional membrane switch 1P includes an upper membrane 10P, a lower membrane 11P, a middle partition layer 12P, and a flexible circuit board 13P. The middle partition layer 12P is sandwiched between the upper membrane 10P and the lower membrane 11P. The lower surface of the upper film 10P is printed with metal lines 101P, and the upper surface of the lower film 11P is printed with metal lines 111P. One end of the flexible circuit board 13P is inserted between the metal circuit 101P of the upper film 10P and the metal circuit 111P of the lower film 11P from the side of the membrane switch 1P. The inserted end of the flexible circuit board 13P has an upper circuit 131P, an upper covering layer 132P, and a lower circuit 134P, and a lower covering layer 135P, wherein the upper covering layer 132P covers a local area of the upper circuit 131P, and the upper circuit 131P exposes the upper connecting end 133P of the upper covering layer 132P for electrical connection with the metal circuit 101P, and the lower covering layer 135P covers A local area of the lower circuit 134P, and the lower circuit 134P exposes the lower connection end 136P of the lower covering layer 135P for electrical connection with the metal circuit 111P.

However, since the metal line 101P of the conventional membrane switch 1P partially overlaps the upper cover layer 132P, a gap is generated between the upper connection terminal 133P, and the metal line 111P partially overlaps the lower cover layer 135P, and a gap occurs between the metal line 111P and the lower cover layer 135P. The faults cause the metal lines 101P and 111P to be susceptible to the stress generated by the upper covering layer 132P and the lower covering layer 135P, and to separate from the upper connection end 133P and the lower connection end 136P, and generate an air gap, resulting in electrical properties. Poor contact causes loss of signal or sending out wrong signal.

In view of the foregoing, in one embodiment, a membrane switch device is provided, which includes a first membrane layer, a second membrane layer, a spacer layer, and a flexible circuit board. The first film layer includes a first surface, a first side edge, and a plurality of first conductive wires. The first surface has a first outlet area, and the first outlet area has a first wireless circuit area and a first circuit area. The conductive lines are arranged on the first surface and extend to the first circuit area to form a plurality of first contact pads. The second film layer includes a second surface, a second side edge and a plurality of second conductive lines. The second surface has a second outlet area, and the second outlet area has a second wireless circuit area and a second circuit area. The conductive lines are arranged on the second surface and extend to the second circuit area to form a plurality of second contact pads. The spacer layer is sandwiched between the first film layer and the second film layer. The flexible circuit board includes terminals, a plurality of first electrical connection lines, a plurality of second electrical connection lines, a first protective layer, a second protective layer, and opposite first and second connection surfaces, these first electrical connections The wires are arranged on the first connection surface and extend to the terminals to form a plurality of first connection terminals. The first protective layer covers the first electrical connection wires and exposes a plurality of first connection terminals. The second electrical connection wires are arranged on The second connecting surface extends to the terminal to form a plurality of second connecting terminals, and the second protective layer covers the second electrical connecting lines and reveals a plurality of second connecting terminals. The terminal of the flexible circuit board is sandwiched between the first outlet area of the first film layer and the second outlet area of the second film layer, and the plurality of first connecting terminals are correspondingly electrically connected to the plurality of first contacts Pad, the plurality of second connecting terminals are correspondingly electrically connected to the plurality of second contact pads. The first protection layer and the plurality of first contact pads do not overlap each other, and the second protection layer and the plurality of second contact pads do not overlap each other.

In one embodiment, a membrane switch device is provided, including a membrane layer and a flexible circuit board. The film layer includes a surface, a side edge and a plurality of conductive lines. The surface has an outlet area, and the outlet area has a wireless circuit area and a circuit area. The conductive wires are arranged on the surface and extend to the circuit area to form a plurality of contact pads. The flexible circuit board includes terminals, a plurality of electrical connection wires, a protective layer and a connection surface. These electrical connection wires are arranged on the connection surface and extend to the terminals to form a plurality of connection terminals. The protective layer covers the multiple electrical connection wires and is exposed Multiple connection terminals. Wherein, the terminal of the flexible circuit board is connected to the lead-out area, the plurality of connecting terminals are correspondingly electrically connected to the plurality of contact pads, and the protective layer and the plurality of contact pads do not overlap each other.

In one embodiment, there is provided a keyboard device including the membrane switch device of any of the above embodiments and a plurality of keys, and the plurality of keys are arranged on the membrane switch device.

In summary, in the membrane switch device of the embodiment of the present invention, the protective layer of the flexible circuit board and the contact pads in the circuit area do not overlap each other, so that the contact pads will not be affected by the stress of the protective layer and separate from the connecting terminals and create gaps. It is achieved that the contact pad and the connecting terminal can maintain a stable electrical contact connection and further reduce the overall thickness of the membrane switch device.

Figure 2 is a partial perspective view of an embodiment of the keyboard device of the present invention, Figure 3 is a partial cross-sectional view of an embodiment of the keyboard device of the present invention, Figure 4 is a partial exploded perspective view of the first embodiment of the membrane switch device of the present invention, and Figure 5 is the present invention A schematic partial cross-sectional view of the first embodiment of the membrane switch device. As shown in Figures 2 and 3, the keyboard device 1 of this embodiment is a computer keyboard. The keyboard device 1 includes a membrane switch device 2, a plurality of keys 3, and a bottom plate 4. The membrane switch device 2 is disposed on the bottom plate 4, and a plurality of The buttons 3 are arranged on the membrane switch device 2 in a pressable arrangement. For example, a reset member (not shown in the figure) may be provided between each button 3 and the membrane switch device 2. For example, the reset member may be an elastic body or an elastic sheet, and when the button 3 is pressed, it can move downward and move toward the membrane switch device 2. The trigger generates a signal and compresses the reset member to accumulate elastic force. When the button 3 is released, the elastic force accumulated by the reset member can make the button 3 rise and return to the unpressed position. In other embodiments, the keyboard device 1 can also be a key set of other electronic products, which is not limited.

As shown in FIGS. 4 and 5, the membrane switch device 2 includes a first membrane layer 10, a second membrane layer 20, a spacer layer 30, and a flexible printed circuit (FPC) 40 (Flexible Printed Circuit, FPC). In this embodiment, the first film layer 10 is located on the top layer, the second film layer 20 is located on the bottom layer, and the spacer layer 30 is sandwiched between the first film layer 10 and the second film layer 20. For example, the spacer layer 30 can be It is adhered between the first film layer 10 and the second film layer 20 through adhesive. However, in some embodiments, the upper and lower configuration relationships of the first film layer 10 and the second film layer 20 of the membrane switch device 2 can be changed according to actual requirements. As shown in Figures 1 and 2, taking the membrane switch device 2 applied to the keyboard device 1 as an example, the first membrane layer 10 can be close to the keys 3 of the keyboard device 1, and the second membrane layer 20 is relatively close to the bottom plate 4 of the keyboard. . Alternatively, in some embodiments, the first film layer 10 may be close to the bottom plate 4 of the keyboard device 1, and the second film layer 20 is relatively close to the keys 3 of the keyboard device 1, which is not limited. In some embodiments, the above-mentioned first film layer 10, second film layer 20, and spacer layer 30 may be made of polyimide, polyethylene terephthalate, or polycarbonate ( Polycarbonate) and other materials made of film.

Please refer to FIG. 4 and FIG. 5, the first film layer 10 has a first surface 11 and a first side edge 13 and is provided with a plurality of first conductive wires 14. In this embodiment, the first surface 11 is the lower surface of the first thin film layer 10 (if the first thin film layer 10 is the bottom layer, the first surface 11 is the upper surface of the first thin film layer 10). In addition, the first surface 11 has a first outlet area 12, wherein the first outlet area 12 is a partial surface area of the first surface 11, and the first outlet area 12 has a first wireless road area 121 and a first line In area 122, the first wireless road area 121 is adjacent to the first side edge 13, and the first line area 122 is farther from the first side edge 13 than the first wireless road area 121. In other words, the first outlet area 12 is further divided into two areas (the first wireless road area 121 and the first line area 122). The first wireless road area 121 is closer to the first side edge 13 than the first line area 122. .

As shown in FIGS. 4 and 5, a plurality of first conductive wires 14 are provided on the first surface 11. For example, the plurality of first conductive wires 14 may be metal circuits, and may be formed on the first surface 11 by printing or etching, wherein each of the first conductive wires 14 may be copper circuits, silver paste circuits or other metals. line. However, each first conductive wire 14 is not limited to a metal material, and any material with conductivity can be used as the material of the first conductive wire 14. In addition, one end of the plurality of first conductive lines 14 further extends to the first circuit region 122 to form a plurality of first contact pads 141, that is, each first conductive line 14 does not extend to the first contact pads of the first outlet region 12 The wireless area 121 constitutes the first wireless area 121 without any wiring configuration on the surface. In some embodiments, the first contact pad 141 may be a partial line at the end of the first conductive wire 14, or the first contact pad 141 may also be a conductive pad provided separately. For example, the first conductive wire 14 may be copper. Line, the first contact pad 141 is a silver paste conductive pad printed on the first circuit area 122 and connected to the end of the first conductive line 14, wherein the electric conductivity of the first contact pad 141 can be greater than that of the first conductive line The conductivity of 14 to enhance the conductive effect.

As shown in FIGS. 4 and 5, the second film layer 20 has a second surface 21 and a second side edge 23 and is provided with a plurality of second conductive wires 24. The second surface 21 faces the first surface 11 of the first film layer 10, and the second side edge 23 and the first side edge 13 of the first film layer 10 are both located on the same side of the film switch device 2. In addition, the second surface 21 has a second outlet area 22 corresponding to one of the first outlet areas 12, wherein the second outlet area 22 is a partial surface area of the second surface 21, and the second outlet area 22 has a first Two wireless road areas 221 and a second line area 222. The second wireless road area 221 is adjacent to the second side edge 23, and the second line area 222 is farther from the second side edge 23 than the second wireless road area 221. In other words, the second outlet area 22 is also divided into two areas (the second wireless road area 221 and the second line area 222). The second wireless road area 221 is closer to the second side edge 23 than the second line area 222. And the second wireless road area 221 corresponds to the first wireless road area 121, and the second line area 222 corresponds to the first line area 122.

As shown in FIGS. 4 and 5, a plurality of second conductive wires 24 are arranged on the second surface 21. For example, the plurality of second conductive wires 24 may be metal circuits, and may be formed on the second surface 21 by printing or etching. In addition, one end of the plurality of second conductive lines 24 further extends to the second circuit area 222 of the second outlet area 22 to form a plurality of second contact pads 241, that is, each second conductive line 24 does not extend to the second The second wireless road area 221 of the outlet area 22 constitutes the second wireless road area 221 without any wiring configuration. In some embodiments, the second contact pad 241 may be a partial circuit of the second conductive wire 24, or the second contact pad 241 may also be a conductive pad provided separately. For example, the second conductive wire 24 may be a copper circuit. The second contact pad 241 is a silver paste conductive pad printed on the second circuit area 222 and connected to the end of the second conductive wire 24, wherein the conductivity of the second contact pad 241 may be greater than that of the second conductive wire 24 by Strengthen the conductive effect.

As shown in FIGS. 4 and 5, the coverage of the spacer layer 30 between the first thin film layer 10 and the second thin film layer 20 does not extend to between the first outlet area 12 and the second outlet area 22. For example, in this embodiment, the spacer layer 30 may be provided with an escape hole 31, and the escape hole 31 corresponds to the first outlet area 12 and the second outlet area 22, so that the first outlet area 12 and the second outlet area The space between 22 is not blocked by the spacer layer 30 for the flexible circuit board 40 to be correspondingly inserted and connected to receive external signals or transmit external signals. For example, as shown in FIG. 1 and FIG. 2, the flexible circuit board 40 can be used to plug in a connector (not shown in the figure) of a computer motherboard, so that when the button 3 is pressed, a corresponding signal can be generated.

As shown in FIGS. 4 and 5, the flexible circuit board 40 includes a terminal 41, a plurality of first electrical connection wires 42, a plurality of second electrical connection wires 43, and a first connection surface 44 and a second connection opposite to each other.面46. The terminal 41 is one end of the flexible circuit board 40, and the terminal 41 is inserted into and sandwiched between the first outlet area 12 of the first film layer 10 and the second outlet area 22 of the second film layer 20 . In addition, the terminal 41 is divided into a covered area 411 and an exposed area 412, that is, the terminal 41 is divided into two areas (covered area 411 and exposed area 412), wherein the exposed area 412 is closer to the flexibility than the covered area 411 The end edge of the circuit board 40.

4 and 5, in this embodiment, the flexible circuit board 40 has a flexible substrate 48, the flexible substrate 48 can be polyimide (Polyimide), polyethylene terephthalate (Polyethylene terephthalate) A film made of a material such as terephthalate or polycarbonate has flexibility, and the first connection surface 44 and the second connection surface 46 are two opposite surfaces of the flexible substrate 48. A plurality of first electrical connection wires 42 are disposed on the first connection surface 44 and extend to the terminal 41 to form a plurality of first connection terminals 421, and a plurality of second electrical connection wires 43 are disposed on the second connection surface 46 and extend to The terminal 41 forms a plurality of second connecting terminals 431, wherein the first electrical connection line 42 and the second electrical connection line 43 can be metal circuits and can be formed by printing or etching. The first connecting terminal 421 may be a partial circuit at the end of the first electrical connection line 42 or an additional conductive pad. The second connecting terminal 431 may also be a partial circuit at the end of the second electrical connection line 43 or a conductive pad provided separately.

As shown in FIGS. 4 and 5, the first connection surface 44 of the flexible circuit board 40 is further provided with a first protective layer 45, wherein the first protective layer 45 can be a flexible film made of plastic material. The first protective layer 45 covers the plurality of first electrical connection lines 42 and only extends to the covering area 411 to expose the exposed area 412 and the plurality of first connecting terminals 421 (that is, the plurality of first connecting terminals 421 are not affected by the first The protective layer 45 covers), and enables the local first electrical connection lines 42 exposed to the outside of the first film layer 10 and the second film layer 20 to be protected by the first protective layer 45 to avoid oxidation or vulcanization caused by exposure to air situation. The second connection surface 46 of the flexible circuit board 40 is also provided with a second protective layer 47, wherein the second protective layer 47 can be a flexible film made of plastic material. The second protective layer 47 covers the plurality of second electrical connection lines 43 and only extends to the covering area 411 to expose the exposed area 412 and the plurality of second connecting terminals 431 (that is, the plurality of second connecting terminals 431 are not subjected to the second The protective layer 47 covers), and enables the local second electrical connection lines 43 exposed outside the first thin film layer 10 and the second thin film layer 20 to be protected by the second protective layer 47 to avoid oxidation or sulfidation due to exposure to air situation.

As shown in FIGS. 4 and 5, the plurality of first connecting terminals 421 of the exposed area 412 of the terminal 41 are electrically connected to the plurality of first contact pads 141 of the first circuit area 122, and cover the first The protection layer 45 and the plurality of first contact pads 141 of the first circuit region 122 do not overlap with each other. The plurality of second connecting terminals 431 of the exposed area 412 of the terminal 41 are correspondingly electrically connected to the plurality of second contact pads 241 of the second circuit area 22, and cover the second protective layer 47 of the area 411 and the second circuit area 22 The plurality of second contact pads 241 do not overlap each other. In detail, as shown in FIG. 5, the first wireless circuit area 121 of the first film layer 10 is overlapped on the first protective layer 45 of the coverage area 411 of the terminal 41, and the first circuit area of the first film layer 10 Each first contact pad 141 of 122 is overlapped on each first connecting terminal 421 of the exposed area 412 of the terminal 41 to achieve electrical contact, forming the first protective layer 45 and the plurality of first contact pads 141 at the same height Position, and the first protective layer 45 and the plurality of first contact pads 141 are in a butt-joining pattern (that is, the end of the first protective layer 45 and the end of the plurality of first contact pads 141 correspond to each other). Does not overlap. Similarly, the second wireless circuit area 221 of the second film layer 20 is overlapped on the second protection layer 47 of the covering area 411 of the terminal 41, and each second contact pad of the second circuit area 222 of the second film layer 20 241 is overlapped on each second connecting terminal 431 of the exposed area 412 of the terminal 41 to achieve electrical contact, forming the second protective layer 47 and the plurality of second contact pads 241 at the same height, and the second protective layer 47 and the plurality of second contact pads 241 of the second film layer 20 are in a butt-connected state (that is, the ends of the second protective layer 47 and the ends of the plurality of second contact pads 241 correspond to each other) and are mutually exclusive overlapping.

Therefore, please refer to FIG. 1 and FIG. 5, the membrane switch device 1 of the embodiment of the present invention is compared with the conventional membrane switch 1P, the first contact pad 141 of the first membrane layer 10 and the second membrane layer 20 The second contact pad 241 will not be separated from the first connection terminal 421 and the second connection terminal 431 of the exposed area 412 due to the stress generated by the first protection layer 45 and the second protection layer 47, resulting in an air gap. ). The first contact pad 141 and the second contact pad 241 can maintain stable electrical contact connections with the first connecting terminal 421 and the second connecting terminal 431 respectively, and further reduce the overall thickness of the membrane switch device 1.

As shown in FIG. 4, in an embodiment, the width of the first connecting terminal 421 and the second connecting terminal 431 may be greater than the width of the first contact pad 141 and the second contact pad 241, so that the first contact pad 141 and the second The contact pad 241 can tolerate a slight offset error in the process of being overlapped with the first connecting terminal 421 and the second connecting terminal 431 respectively. Referring to FIG. 9, in one embodiment, the width W1 of the first connecting terminal 421 may refer to the distance between the two opposite long sides of the first connecting terminal 421, and the width W2 of the second connecting terminal 431 may refer to the second connecting terminal 421. The distance between the two opposite long sides of the terminal 431. The width of the first contact pad 141 may refer to the distance between the first contact pad 141 and the two long sides, and the width of the second contact pad 241 may refer to the distance between the second contact pad 241 and the two long sides, which is omitted in this figure.

As shown in Figures 2, 3 and 5, in one embodiment, the terminal 41 of the flexible circuit board 40 is inserted between the first film layer 10 and the second film layer 20 and electrically connected to a plurality of first After the conductive wires 14 and a plurality of second conductive wires 24, the flexible circuit board 40 can be bent and folded under the bottom plate 4, and the first film layer 10, the terminals 41, the second film layer 20, and the bottom plate are connected through the fixing member 5. 4 and the local area of the flexible circuit board 40 stacked under the bottom plate 4 are tightly fixed to each other (for example, by clamping or locking), so that the first contact pad 141 and the second contact pad 241 can be connected to the first The terminal 421 is in close electrical contact with the second connecting terminal 431.

As shown in FIG. 5, in an embodiment, the end of the first protective layer 45 of the membrane switch device 2 and the ends of the first contact pads 141, and the second protective layer 47 and the first The ends of the two contact pads 241 can maintain a tolerance distance S between each other. In this way, it is possible to avoid manufacturing tolerances of the components of the membrane switch device 2 (the first membrane layer 10, the second membrane layer 20, the spacer layer 30 and the flexible circuit board 40), resulting in the first protective layer 45 and multiple The overlap between the first contact pads 141 and the second protection layer 47 and the plurality of second contact pads 241 occurs, but this is not limited. In another embodiment, as shown in FIG. 6, between the end of the first protective layer 45 of the membrane switch device 2A and the end of the plurality of first contact pads 141, and the end of the second protective layer 47 and The ends of the plurality of second contact pads 241 may also be joined to each other.

As shown in FIG. 6, the area of the coverage area 411 of the flexible circuit board 40 of the membrane switch device 2A of the present embodiment is smaller than the area of the exposed area 412. Here, the coverage area 411 is the terminal 41 between the first side edge 13 to the edge of the first protection layer 45, the exposed area 412 is the area between the terminal 41 between the edge of the first protection layer 45 and the edge of the flexible substrate 48. Alternatively, the covered area 411 is the area between the terminal 41 between the second side edge 23 and the edge of the second protective layer 47, and the exposed area 412 is the area between the terminal 41 between the edge of the second protective layer 47 and the edge of the flexible substrate 48. Between areas. Thereby, the exposed length of the first connecting terminal 421 and the second connecting terminal 431 provided on the exposed area 412 can be increased to increase the electrical contact area, thereby achieving a better electrical connection effect.

In some embodiments, the membrane switch device 2 may only be provided with circuits on the first membrane layer 10 or the second membrane layer 20. As shown in FIG. 7, the membrane switch device 2B of this embodiment is only provided with a plurality of first conductive wires 14 on the first surface 11 of the first thin film layer 10, and no wires are provided on the second surface 21 of the second thin film layer 20 . The flexible circuit board 40 correspondingly only has a first protective layer 45, a plurality of first electrical connecting wires 42 and a plurality of first connecting terminals 421 on the first connecting surface 44. Or, as shown in FIG. 8, the membrane switch device 2C of this embodiment is only provided with a plurality of second conductive wires 24 on the second surface 21 of the second membrane layer 20, and the first surface 11 of the first membrane layer 10 is not Set up the line. The flexible circuit board 40 correspondingly only has the second protective layer 47, the plurality of second electrical connecting wires 43 and the plurality of second connecting terminals 431 on the second connecting surface 46.

As shown in FIGS. 5 and 9, in one embodiment, the plurality of first connecting terminals 421 on the first connecting surface 44 of the flexible circuit board 40 and the second connecting terminals 431 on the plurality of second connecting surfaces 46 It can be arranged alternately to reduce the thickness of the first film layer 10, the second film layer 20, and the flexible circuit board 40 after being overlapped with each other, thereby facilitating the thinning of the film switch device 2.

Although the technical content of the present invention has been disclosed in the preferred embodiments as above, it is not intended to limit the present invention. Anyone who is familiar with this technique and makes some changes and modifications without departing from the spirit of the present invention should be covered by the present invention Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1P‧‧‧Membrane switch 10P‧‧‧Upper film 101P‧‧‧Metal circuit 11P‧‧‧Lower film 111P‧‧‧Metal circuit 12P‧‧‧Intermediate layer 13P‧‧‧Flexible circuit board 131P‧‧‧Top circuit 132P‧‧‧Upper cover 133P‧‧‧Upper connection 134P‧‧‧Lower line 135P‧‧‧Lower cover 136P‧‧‧Lower connection 1‧‧‧Keyboard device 2, 2A～2C‧‧‧Membrane switch Device 3‧‧‧Button 4‧‧‧Bottom plate 5‧‧‧Fixer 10‧‧‧First film layer 11‧‧‧First surface 12‧‧‧First outlet area 121‧‧‧First wireless road area 122‧‧‧First circuit area 13‧‧‧First side edge 14‧‧‧First conductive wire 141‧‧‧First contact pad 20‧‧‧Second film layer 21‧‧‧Second surface 22‧‧ ‧Second Outlet Area 221‧‧‧Second Wireless Road Area 222‧‧‧Second Circuit Area 23‧‧‧Second Side Edge 24‧‧‧Second Conductive Wire 241‧‧‧Second Contact Pad 30‧‧ ‧Interval layer 31‧‧‧Escape hole 40‧‧‧Flexible circuit board 41‧‧‧Terminal 411‧‧‧ Covered area 412‧‧‧Exposed area 42‧‧‧First electrical connection line 421‧‧‧First Connection terminal 43‧‧‧Second electrical connection line 431‧‧‧Second connection terminal 44‧‧‧First connection surface 45‧‧‧First protection layer 46‧‧‧Second connection surface 47‧‧‧Second protection Layer 48‧‧‧Flexible substrate S‧‧‧Tolerance spacing W1, W2‧‧‧Width

[Figure 1] is a partial cross-sectional schematic diagram of a conventional membrane switch. [Figure 2] A partial perspective view of an embodiment of the keyboard device of the present invention. [Figure 3] is a partial cross-sectional view of an embodiment of the keyboard device of the present invention. [Figure 4] is a partial exploded perspective view of the first embodiment of the membrane switch device of the present invention. [Figure 5] is a schematic partial cross-sectional view of the first embodiment of the membrane switch device of the present invention. [Figure 6] is a schematic partial cross-sectional view of the second embodiment of the membrane switch device of the present invention. [Figure 7] is a partial cross-sectional view of the third embodiment of the membrane switch device of the present invention. [Figure 8] is a schematic partial cross-sectional view of the fourth embodiment of the membrane switch device of the present invention. [Figure 9] is a partial plan view of an embodiment of the flexible circuit board of the present invention.

2‧‧‧Membrane switch device

10‧‧‧First film layer

11‧‧‧First surface

12‧‧‧First qualifying area

121‧‧‧First Wireless Road Zone

122‧‧‧First Route Area

13‧‧‧First side edge

14‧‧‧The first conductive wire

141‧‧‧First contact pad

20‧‧‧Second film layer

21‧‧‧Second Surface

22‧‧‧Second qualifying area

221‧‧‧Second Wireless Road Zone

222‧‧‧Second Route Area

23‧‧‧Second side edge

24‧‧‧Second conductive wire

241‧‧‧Second contact pad

30‧‧‧Interval layer

31‧‧‧Escape

40‧‧‧Flexible circuit board

41‧‧‧Terminal

411‧‧‧ Coverage Area

412‧‧‧Exposed Area

42‧‧‧The first electrical connection line

421‧‧‧First connection terminal

43‧‧‧Second electrical connection line

431‧‧‧Second connection terminal

44‧‧‧First connection surface

45‧‧‧First protective layer

46‧‧‧Second connection surface

47‧‧‧Second protective layer

48‧‧‧Flexible substrate

S‧‧‧Tolerance spacing

Claims (16)

A membrane switch device includes: a first membrane layer, including a first surface, a first side edge and a plurality of first conductive wires, the first surface has a first outlet area, the first outlet area has A first wireless circuit area and a first circuit area, the first conductive lines are arranged on the first surface and extend to the first circuit area to form a plurality of first contact pads; a second film layer including a A second surface, a second side edge and a plurality of second conductive lines, the second surface has a second outlet area, the second outlet area has a second wireless circuit area and a second circuit area, the A second conductive line is disposed on the second surface and extends to the second circuit area to form a plurality of second contact pads; a spacer layer is sandwiched between the first film layer and the second film layer; and a The flexible circuit board includes a terminal, a plurality of first electrical connection lines, a plurality of second electrical connection lines, a first protection layer, a second protection layer, and a first connection surface and a second connection surface opposite to each other , The first electrical connection lines are disposed on the first connection surface and extend to the terminals to form a plurality of first connecting terminals, and the first protective layer covers the first electrical connection lines and exposes the first Connecting terminals, the second electrical connecting wires are disposed on the second connecting surface and extending to the terminal to form a plurality of second connecting terminals, the second protective layer covers the second electrical connecting wires and reveals the A second connecting terminal; wherein the terminal of the flexible circuit board is sandwiched between the first outlet area of the first film layer and the second outlet area of the second film layer, the The first connecting terminals are correspondingly electrically connected to the first contact pads, and the second connecting terminals are correspondingly electrically connected to the second contact pads; Wherein, the first protection layer and the first contact pads do not overlap each other, and the second protection layer and the second contact pads do not overlap each other. The membrane switch device according to claim 1, wherein the first protection layer and the first contact pads are butted with each other, and the second protection layer and the second contact pads are butted with each other. The membrane switch device according to claim 1, wherein the first wireless circuit area is adjacent to the first side edge, and the first circuit area is farther from the first side edge than the first wireless circuit area. The membrane switch device according to claim 3, wherein the spacer layer does not extend between the first outlet area and the second outlet area. The membrane switch device according to claim 4, wherein the second outlet area corresponds to the first outlet area. The membrane switch device according to claim 1, wherein the first protective layer and the first contact pads maintain a tolerance distance between each other. The membrane switch device according to claim 1, wherein the first connecting terminals and the second connecting terminals are arranged alternately. The membrane switch device according to claim 1, wherein the width of each of the first connecting terminals is greater than the width of each of the first contact pads. The membrane switch device according to claim 1, wherein the terminal is divided into a coverage area and an exposed area, and the first protective layer covers the first electrical connection lines and only extends to the coverage area to expose the exposed area And the first connecting terminals, the second protective layer covers the second electrical connection lines and only extends to the covering area to expose the exposed area and the second connecting terminals, and the area of the covering area is smaller than the The area of the exposed area. A membrane switch device includes: A thin film layer includes a surface, a side edge, and a plurality of conductive wires. The surface has an outlet area. The outlet area has a wireless circuit area and a circuit area. The conductive wires are arranged on the surface and extend to The circuit area forms a plurality of contact pads; and a flexible circuit board, including a terminal, a plurality of electrical connection lines, a protective layer, and a connection surface. The terminal is divided into a covered area and an exposed area, and the electrical connection The wire is arranged on the connecting surface and extends to the terminal to form a plurality of connecting terminals. The protective layer covers the electrical connecting wires and only extends to the covering area to expose the exposed area and the connecting terminals; wherein, the The terminal of the flexible circuit board is connected to the outlet area, the connecting terminals are correspondingly electrically connected to the contact pads, and the protective layer and the contact pads do not overlap each other. The membrane switch device according to claim 10, wherein the protective layer and the contact pads are butted with each other. The membrane switch device according to claim 10, wherein the wireless circuit area is adjacent to the side edge, and the circuit area is farther from the side edge than the wireless circuit area. The membrane switch device according to claim 10, wherein the protective layer and the contact pads maintain a tolerance distance between each other. The membrane switch device according to claim 10, wherein the width of each connecting terminal is greater than the width of each contact pad. The membrane switch device according to claim 10, wherein the area of the covered area is smaller than the area of the exposed area. A keyboard device includes: the membrane switch device according to any one of claims 1 to 15; and a plurality of keys arranged on the membrane switch device.

Images