TWI603356B - Keyswitch structure - Google Patents

Description

Button structure

The present invention generally relates to a button structure, and more particularly to a button structure for reducing circuit impedance and improving component soldering feasibility.

The keyboard is a very important input device for electronic products (especially computers), and the development of the keyboard has a close relationship with the convenience of the user. In order to operate the keyboard smoothly in a dim environment, the illuminated keyboard has gradually become the first choice for consumers. However, the conventional illuminated keyboard usually has the backlight module disposed under the button module, so that the brightness of the whole keyboard is relatively uneven, and the thickness of the keyboard is relatively increased, which is disadvantageous for the requirement of thinning.

Moreover, the conventional button is usually a switch that is triggered by a laminated flexible circuit film, and the general flexible circuit film is formed by silver paste to form a circuit pattern, so that the impedance of the circuit is large. The poor stability of the electrical conduction is more detrimental to the soldering integration of the light-emitting element and the electronic component.

Therefore, under the requirements of thinning and uniformity of brightness, how to effectively integrate the light-emitting elements into the button structure is one of the important considerations for design.

An object of the present invention is to provide a button structure having a circuit structure integrating a switch circuit and a light source circuit to simplify circuit design and increase integration feasibility.

Another object of the present invention is to provide a button structure with silver paste printing The circuit structure of the circuit layer and the hard printed circuit board of the copper wire further reduces the circuit impedance and improves the welding feasibility of the light-emitting element and/or the electronic component.

In one embodiment, the present invention provides a button structure including a bottom plate, a key cap, a circuit structure, and a light emitting component, wherein the key cap is movably disposed above the bottom plate with respect to the bottom plate; the circuit structure is disposed under the key cap, and the circuit structure The first circuit board, the second circuit board and the spacer layer are included. The first circuit board has a first switching line formed of a first conductive material on a lower surface of the first circuit board; the second circuit board has a second switching line formed by a second conductive material on an upper surface of the second circuit board, The second conductive material has a lower impedance than the first conductive material; the spacer layer is disposed between the first circuit board and the second circuit board to separate the first switch line and the second switch line. The light emitting component is disposed on the second circuit board and electrically connected to the second circuit board to provide light. When a pressing force is applied to the keycap, the keycap moves toward the bottom plate to deform the first circuit board downward, so that the first switch line contacts the second switch line, thereby generating a trigger signal.

In one embodiment, the first conductive material is silver paste and the second conductive material is copper or gold.

In one embodiment, the first circuit board further has a light source perforation and the second circuit board has a light source circuit, wherein the light source circuit is formed by the second conductive material on the upper surface of the second circuit board, and the light emitting element is electrically connected to the light source circuit and configured It protrudes from the upper surface of the second circuit board to be exposed from the light source through the spacer layer.

In one embodiment, the second circuit board has a light source circuit, wherein the light source circuit is formed by the second conductive material on the lower surface of the second circuit board, and the light emitting element is electrically connected to the light source circuit and disposed on the lower surface of the second circuit board.

In an embodiment, the circuit structure further includes a protective layer, wherein the protective layer is disposed at The lower surface of the second circuit board covers the light source circuit, the protective layer has a broken hole, and the light emitting element is exposed from the broken hole.

In one embodiment, the circuit structure has a light source aperture, and the light source aperture extends through the first circuit board, the spacer layer, and the second circuit board, and the light emitting component passes through the light source hole from the lower surface of the second circuit board to face the keycap Provide light.

In one embodiment, the circuit structure is disposed under the bottom plate, and the bottom plate further has a receiving hole, and the light emitting component is partially received in the receiving hole.

In one embodiment, the button structure of the present invention further includes an electronic component, wherein the circuit structure is disposed above the bottom plate, and the bottom plate further has a component hole, the second circuit board further has a component circuit, and the component circuit is formed by the second conductive material. The lower surface of the second circuit board, and the electronic component is electrically connected to the component line and protrudes from the lower surface of the second circuit board to be at least partially received in the component hole.

In an embodiment, the button structure of the present invention further comprises an electronic component, wherein the circuit structure is disposed under the bottom plate, the first circuit board further has component perforations and the second circuit board further has component lines, and the component circuit is made of the second conductive material. Formed on the upper surface of the second circuit board, the bottom plate further has a component hole and a switch hole, and the electronic component is electrically connected to the component line and penetrates through the component to be at least partially received in the component hole, and the light emitting component is exposed from the switch hole.

In one embodiment, the first switch line and the second switch line are corresponding to the switch hole. When the key cap moves toward the bottom plate, the first circuit board is deformed downward through the switch hole, so that the first switch line contacts the second switch line. And then generate a trigger signal.

100‧‧‧Key structure

110‧‧‧Key Cap

112, 114‧‧‧ coupling mechanism

118‧‧‧Trigger

120‧‧‧floor

122, 124‧‧‧ Linked institutions

125‧‧‧ accommodating holes

126‧‧‧Component hole

128‧‧‧Switch hole

130‧‧‧ Lifting mechanism

132‧‧‧First bracket

134‧‧‧second bracket

140‧‧‧Circuit structure

140a, 140b‧‧‧ hole

140c‧‧‧Light source hole

141‧‧‧Switch circuit

142‧‧‧First board

142a‧‧‧First Conduction Point

142b‧‧‧First wire

1422, 1422'‧‧‧ first switch circuit

1424‧‧‧Light source perforation

1426‧‧‧ Component perforation

144‧‧‧ spacer

144a‧‧‧ first hole

144b‧‧‧Second hole

144c‧‧‧ component perforation

146‧‧‧Second circuit board

146a‧‧‧second conduction point

146b‧‧‧second wire

146c‧‧‧ third conduction point

146d‧‧‧third wire

1462, 1462' ‧ ‧ second switch line

1464‧‧‧Component lines

148‧‧‧Protective layer

148a, 148b‧‧‧ hole

150‧‧‧Lighting elements

152‧‧‧Light source circuit

152a, 152b‧‧‧ copper wire

160‧‧‧Response unit

162‧‧‧Trigger

170‧‧‧Electronic components

330‧‧‧ Lifting mechanism

332, 334‧‧‧ bracket

332a, 334a‧‧‧ rotatable parts

332b, 334b‧‧‧ slidable parts

340‧‧‧ Circuit structure

FIG. 1 is a schematic diagram of a button structure according to an embodiment of the present invention.

2 is an exploded perspective view showing a switching circuit of a circuit structure of a key structure according to an embodiment of the present invention.

3A and 3B are exploded views of the switch circuit of the circuit structure of the key structure of the present invention.

4A-4C are schematic diagrams showing the structure of a button according to various embodiments of the present invention.

5A and 5B are respectively an exploded view and a cross-sectional view of a button structure according to another embodiment of the present invention.

Figure 5C is a schematic cross-sectional view of a variation of Figure 5A.

The invention provides a button structure, in particular to a circuit structure having an integrated switch circuit and a light source circuit, to simplify the circuit design and increase the integration feasibility. Specifically, the button structure of the present invention can be any button with a light-emitting function, which can be applied to a separate keyboard device or an electronic product (such as a button equipped with a mobile device, a tablet computer, etc.), but is not limited thereto. Details of the key structure of the embodiment of the present invention will be described in detail later with reference to the drawings.

As shown in FIG. 1 , in one embodiment, the key structure 100 of the present invention includes a key cap 110 , a bottom plate 120 , a circuit structure 140 , and a light emitting element 150 . Specifically, the key cap 110 is movably disposed above the bottom plate 120 with respect to the bottom plate 120. The circuit structure 140 has a switch circuit 141 and a light source circuit 152 to simultaneously serve as a trigger switch for the button and a circuit board for the light-emitting element 150. Specifically, the circuit structure 140 includes a first circuit board 142, a spacer layer 144, and a second circuit board 146. The first circuit board 142 has a first switch line 1422 on a lower surface of the first circuit board 142. The second circuit board 146 has a second switch line 1462 on the upper surface of the second circuit board 146. The spacer layer 144 is disposed on the first electricity The circuit board 142 and the second circuit board 146 are disposed to partition the first switch line 1422 and the second switch line 1462. The first switch line 1422 is formed of a first conductive material, the second switch line 1462 is formed of a second conductive material, and the second conductive material has a lower impedance than the first conductive material. The light emitting element 150 is disposed on the circuit structure 140, particularly the second circuit board 146 of the circuit structure 140 and electrically connected to the second circuit board 146 to provide light. When a pressing force is applied to the keycap 110, the keycap 110 moves toward the bottom plate 120 to deform the first circuit board 142 downward, so that the first switch line 1422 contacts the second switch line 1462, thereby generating a trigger signal.

The button structure 100 of the present invention may further include other components, such as the lifting mechanism 130 and the recovery unit 160, but is not limited thereto. The two ends of the lifting mechanism 130 are movably connected to the keycap 110 and the bottom plate 120 respectively to support the movement of the key cap 110 relative to the bottom plate 120. In this embodiment, the lifting mechanism 130 can be a scissor lifting mechanism that is pivotally connected to the first bracket 132 and the second bracket 134, but is not limited thereto. The bottom plate 120 has a coupling mechanism 122, 124 (such as a shaft hole, a chute or a hook) to couple the lower end of the lifting mechanism 130. Correspondingly, the key cap 110 has coupling mechanisms 112, 114 (such as a chute, a shaft hole) to couple the upper end of the lifting mechanism 130. In other words, the lifting mechanism 130 is disposed between the keycap 110 and the bottom plate 120, and the coupling mechanisms 112, 114 of the keycap 110 are slidably and rotatably coupled to the upper ends of the first bracket 132 and the second bracket 134, respectively. The connecting mechanisms 122 and 124 of the bottom plate 120 are respectively rotatably and slidably coupled to the lower ends of the first bracket 132 and the second bracket 134 to support the movement of the keycap 110 relative to the bottom plate 120.

The recovery unit 160 provides a restoring force to return to the position before pressing when the keycap 110 is pressed. Depending on the design requirements, the response unit 160 can be implemented as a resilient member (eg, a spring or elastomer) or a magnetic unit such that the keycap 110 can be resiliently or magnetically restored to a position prior to compression. In this embodiment, the reply unit 160 is described as an elastomer. In other embodiments (not shown), reply The unit may be implemented as a magnetic unit to return the keycap to a position before pressing by magnetic attraction or magnetic repulsion. For example, the elastic body may be replaced by a pair of polar repulsive magnetic components respectively disposed on the keycap 110 and the bottom plate 120 to return the keycap 110 to the position before pressing by magnetic repulsion. In another embodiment (not shown), the elastic body can be replaced by a pair of polar-adsorbing magnetic components respectively disposed on the button frame and the key cap to return the keycap to the position before pressing by magnetic attraction. It should be noted that when the magnetic unit is used as the recovery unit to provide the restoring force, the position of the magnetic unit can be changed according to actual needs, and can be matched or integrated with other components of the button structure to provide a restoring force, It is limited to the examples.

The implementation and arrangement of the circuit structure 140 will be described in detail later. Specifically, the circuit structure 140 is disposed under the keycap 110 and may be located above or below the bottom plate 120. In this embodiment, as shown in FIG. 1 , the circuit structure 140 is disposed above the bottom plate 120 . It should be noted that when the circuit structure 140 is disposed above the bottom plate 120, the circuit structure 140 has the holes 140a, 140b corresponding to the connection mechanisms 122, 124 of the bottom plate 120, so that the connection mechanisms 122, 124 can pass through the holes 140a, The 140b is coupled to the lower ends of the first bracket 132 and the second bracket 134.

Referring to FIGS. 1 and 2, the first circuit board 142 preferably has a flexible (or soft) circuit film such that the first circuit board 142 can be bent downward when pressed. For example, the first circuit board 142 includes a flexible insulating film and a first switch line 1422 formed on the insulating film. The flexible insulating film is preferably made of a polymer, such as polyethylene terephthalate (PET), polycarbonate (PC) or polyimide (PI), and the like. An example is polyethylene terephthalate. The first switch line 1422 includes a first conductive point 142a and a first conductive line 142b electrically connected to the first conductive point 142a, and the first conductive material is preferably silver paste. In other words, the first circuit board 142 is printed by the silver paste to the first conductive point 142a and the first conductive line 142b. A flexible (or soft) circuit patch of a compound (eg PET) film.

The second circuit board 146 is preferably a rigid printed circuit board to form the second switch line 1462 and the light source circuit 152 by the printed circuit board process, so that the second switch line 1462 can have a lower impedance, and the light source circuit 152 not only has Lower impedances have better soldering feasibility. For example, the second switch line 1462 and the light source circuit 152 are preferably formed of a second conductive material, and the second conductive material has a lower impedance than the first conductive material. In this embodiment, the second conductive material may be copper or gold, and the second conductive material is preferably copper at a cost. The second switch line 1462 includes a second conductive point 146a and a second conductive line 146b electrically connected to the second conductive point 146a, and the light source circuit 152 includes copper wires 152a, 152b. In this embodiment, the second switch line 1462 and the light source circuit 152 are formed on the same surface (ie, the upper surface) of the second circuit board 146. In other words, the second circuit board 146 is formed by a copper foil printed circuit board technology to simultaneously form the second switch line 1462 and the light source circuit 152 on the upper surface of the hard copper foil printed circuit board to improve the stability of the conductive and the soldering of the light emitting element 150. feasibility.

The spacer layer 144 is disposed between the first circuit board 142 and the second circuit board 146 to separate the first switch line 1422 and the second switch line 1462. Specifically, the spacer layer 144 has a first hole 144a, and the first conductive point 142a and the second conductive point 146a are located corresponding to the first hole 144a and face each other. The spacer layer 144 may be an insulating film made of any suitable material, such as polyethylene terephthalate (PET), polycarbonate (PC) or polyimine (PI), etc., but not limit.

The first switch line 1422 and the second switch line 1462 constitute a switch circuit 141, and the first conductive point 142a and the second conductive point 146a preferably have a larger area with respect to the first wire 142b and the second wire 146b to ensure Electrical contact of the switching circuit 141. In this embodiment, the first conductive point 142a and the second conductive point 146a are preferably circular, but are not limited thereto. For other implementations For example, the first conductive point 142a and the second conductive point 146a may be rectangular, triangular, or circular. When the keycap 110 is pressed, the key cap 110 is moved downward toward the bottom plate 120 by the support of the lifting mechanism 130, and simultaneously compresses the elastic recovery unit 160, and is pressed against the circuit structure by the trigger portion 162 disposed on the elastic body. The first circuit board 142 is bent downward and deformed, so that the first conductive point 142a is electrically connected to the second conductive point 146a through the first hole 144a to generate a trigger signal. It should be noted that the triggering portion can be disposed on the keycap 110, the returning unit (such as the elastic body) 160 or the lifting mechanism 130 according to design requirements to trigger the switching circuit 141 of the circuit structure 140 as the keycap 110 moves downward.

In this embodiment, the light-emitting element 150 is disposed to protrude from the upper surface of the second circuit board 146 and electrically connect the light source circuit 152 of the second circuit board 146 to provide light to illuminate the keycap 110. Specifically, the key cap 110 may be a light transmissive keycap or have a light transmissive area, wherein the light transmissive area may be in the form of a character, a pattern, or the like. The light emitting element 150 can be implemented as a light emitting diode, and the copper wires 152a, 152b of the light source circuit 152 can be electrically connected by soldering technology or surface mount technology (SMT) so that the light of the light emitting element 150 illuminates the key cap 110. It is transmitted from the key cap or the light transmitting area. It should be noted that when the light emitting element 150 is disposed on the second circuit board 146, the spacer layer 144 has the second hole 144b, and the first circuit board 142 has the light source through hole 1424, wherein the second hole 144b communicates with the light source through hole 1424 and corresponds to the light emitting element. The position of 150 is such that the light emitting element 150 is disposed on the second circuit board 146 and passes through the second hole 144b and the light source through hole 1424, and is exposed from the light source through hole 1424. In addition, the exposed portion of the light-emitting element 150 from the light source through-hole 1424 may be covered by an insulating glue or an insulating layer (not shown) to avoid electrostatic breakdown of the button and damage of the light-emitting element 150 during the static test.

Furthermore, the key structure 100 of the present invention further includes an electronic component 170, and the electronic component 170 can be various electronic components required for the operation of the key structure 100 or the keyboard device, such as a micro control unit, a resistor, a capacitor, an inductor, etc., but Not limited to this. In this embodiment, the bottom plate 120 is more There is a component aperture 126 and the second circuit board 146 has a component line 1464. The component line 1464 is preferably formed of a second conductive material on a lower surface of the second circuit board 146. In other words, the light-emitting element 150 and the electronic component 170 are respectively disposed on opposite surfaces (ie, the upper surface and the lower surface) of the second circuit board 146, and the second circuit board 146 is a hard copper foil printed circuit board having a double-sided line ( For example, the upper surface has a second switch line 1462 and a light source circuit 152, and the lower surface has a component line 1464) to enhance soldering feasibility and conductive stability of the electronic component 170. The electronic component 170 is electrically connected to the component circuit 1464 and protrudes from the lower surface of the second circuit board 146 to be at least partially received in the component aperture 126. Thereby, the extra space required for the electronic component 170 in the button structure can be reduced or even eliminated, thereby effectively reducing the overall height of the button structure 100. It should be noted that FIG. 1 illustrates that the electronic component 170 is disposed on the lower surface of the second circuit board 146, but is not limited thereto. In other embodiments, the electronic component 170 can also be disposed on the upper surface of the second circuit board 146, and the first circuit board 142 and the spacer layer 144 have corresponding component perforations, so that the electronic component 170 can protrude from the first circuit board. 142 (refer to Figure 4).

In addition, the switching circuit 141 of the circuit structure 140 can have different implementations, and is not limited to that shown in FIG. 2. As shown in FIG. 3A and FIG. 3B, in other embodiments, the first switch line 1422' of the first circuit board 142 has a first conductive point 142a, and the first conductive point 142a is preferably circular, but not Limited. In other embodiments, the first conductive point 142a can be rectangular, triangular, or circular, or the like. The second switch line 1462' of the second circuit board 146 includes a second conductive point 146a, a third conductive point 146c, a second conductive line 146b, and a third conductive line 146d, wherein the second conductive line 146b and the third conductive line 146d are respectively connected to the second The conduction point 146a and the third conduction point 146c. In other words, the second circuit board 146 is preferably a hard copper foil printed circuit board having a circuit pattern of the second switch line 1462' and the light source circuit 152, and the second wire 146b and the second conductive point 146a are connected to the third wire 146d and Third conduction Point 146c is electrically isolated. The spacer layer 144 is disposed between the first circuit board 142 and the second circuit board 146 to separate the first switch line 1422' and the second switch line 1462', and the first conductive point 142a and the second conductive point 146a and the third The conduction point 146c is disposed corresponding to the first hole 144a. When the key cap 110 is pressed, the key cap 110 is moved downward toward the bottom plate 120 by the support of the lifting mechanism 130, and simultaneously compresses the elastic type recovery unit 160, and then the triggering portion 162 is pressed against the electrical structure 140, and the first The circuit board 142 is bent and deformed downward, so that the first conductive point 142a is electrically connected to the second conductive point 146a and the third conductive point 146c through the first hole 144a. Thereby, the second conduction point 146a and the third conduction point 146c are connected by the first conduction point 142a to generate a trigger signal.

In the embodiment shown in FIG. 3A, the second conductive point 146a and the third conductive point 146c are preferably finger-shaped to improve electrical connection stability. Specifically, the second conductive point 146a and the third conductive point 146c are complex fingers extending from the end of the second wire 146b and the third wire 146d, respectively, but are not limited thereto. In the embodiment shown in FIG. 3B, the second conductive point 146a and the third conductive point 146c are preferably S-shaped to improve electrical connection stability. Specifically, the second conductive point 146a and the third conductive point 146c are snakes extending from the end of the second wire 146b and the end of the third wire 146d, respectively.

In addition, as shown in FIG. 4A to FIG. 4C , in other embodiments, the circuit structure 140 is disposed under the bottom plate 120 . When the circuit structure 140 is disposed under the bottom plate 120, the bottom plate 120 preferably has a switch hole 128, wherein the switch hole 128 corresponds to the switch circuit of the circuit structure 140 (ie, the position of the hole 144a corresponding to the spacer layer 144), so that the key cap 110 When pressed, the triggering portion 162 passes through the switch hole 128 to trigger the circuit structure 140 to generate a trigger signal. In addition, corresponding to the position of the light-emitting element 150, the bottom plate 120 may have an additional light source hole (not shown), so that the light-emitting element 150 can protrude from the circuit structure 140 into the light source hole, thereby causing the light to illuminate the key cap 110. In this embodiment, the illumination The element 150 is located near the center of the button, and the switch hole 128 is appropriately sized such that the light-emitting element 150 can be located in the switch hole 128 without the need for additional light source holes in the bottom plate 120.

Moreover, in the embodiment of FIG. 4A, the component line 1464 of the second circuit board 146 is formed on the upper surface of the second circuit board 146 by a second conductive material (for example, copper), so that the electronic component 170 can be electrically connected to the component. The line 1464 is disposed on the upper surface of the second circuit board 146. In other words, the second circuit board 146 preferably forms a circuit pattern of the second switch line 1462, the light source circuit 152, and the component line 1464 on the same surface of the hard copper foil printed circuit board by the copper foil printed circuit board technology. As shown in FIG. 4A, when the circuit structure 140 is disposed under the bottom plate 120, the bottom plate 120 may have not only the switch hole 128 but also the element hole 126. The first circuit board 142 and the spacer layer 144 further have component vias 1426, 144c such that the electronic component 170 is electrically coupled to the component traces 1464 and through the component vias 1426, 144c to be at least partially received in the component apertures 126. Thereby, the extra space required for the electronic component 170 in the button structure can be reduced or even eliminated, thereby effectively reducing the overall height of the button structure 100.

In the embodiment of FIG. 4B, the light source circuit 152 and the component line 1464 of the second circuit board 146 are formed on the lower surface of the second circuit board 146 by a second conductive material (for example, copper) to electrically connect the light emitting elements 150 and Electronic component 170. In other words, the second circuit board 146 is preferably formed by a copper foil printed circuit board technology, a second switch line 1462 is formed on the upper surface, and the light source circuit 152 and the component line 1464 are formed on the lower surface of the double-sided line hard copper foil printed circuit board. . As shown in FIG. 4B, the light-emitting element 150 is disposed on one side of the second circuit board 146 facing away from the spacer layer 144, and the circuit structure 140 further has a light source hole 140c extending through the first circuit board 142, the spacer layer 144, and the second circuit board. 146. For example, the light emitting element 150 can be a reversed light emitting diode. Thereby, the light emitting element 150 can be electrically connected to the second circuit board 146 facing away from the spacer layer 144 by the copper wires 152a, 152b. One side passes through the light source hole 140c to provide light in the direction of the keycap 110.

It should be noted that although FIG. 4B uses an inverted light-emitting diode as an embodiment of the light-emitting element 150, the light-emitting element 150 may also be a side-emitting type light-emitting diode. As shown in FIG. 4C, in a variant, the light-emitting element 150 is disposed on the lower surface of the second circuit board 146 and electrically connects the light source circuit 152 formed by the copper wires 152a, 152b, and the protective layer 148 can be disposed corresponding to the light-emitting element 150. The lower surface of the second circuit board 146 is covered to protect the light source circuit 152. Specifically, the protective layer 148 may be provided with a hole 148a corresponding to the position of the light emitting element 150. When the light emitting element 150 is disposed on the lower surface of the second circuit board 146, the light emitting element 150 is exposed from the broken hole 148a. In addition, the protective layer 148 can not only protect the light source circuit 152 but also serve as a light guiding layer, so that the light provided by the light emitting element 150 is transmitted along the protective layer 148 to guide the keycap 110. Furthermore, the protective layer 148 may be provided with a hole 148b corresponding to the position of the electronic component 170, and the electronic component 170 may be exposed from the hole 148b. In this embodiment, the protective layer 148 can also be a PET film or any suitable polymeric film.

Further, although the above embodiment has been described with a scissors type lifting mechanism, the present invention is not limited thereto. As shown in FIGS. 5A and 5B, the lifting mechanism 330 can be implemented as a butterfly lifting mechanism. Specifically, the pivotal connection of the two brackets 332, 334 is below the center of the keycap 110 and near the bottom plate 120. Specifically, the two brackets 332, 334 are respectively disposed on opposite sides and are rotatably connected to the keycap 110 and movably connected to the bottom plate 120 to respectively support the opposite sides of the keycap 110 to form a butterfly-like wing. Form of lifting mechanism. In this embodiment, the brackets 332, 334 each have a rotatable portion 332a, 334a and a slidable portion 332b, 334b to correspond to the keycap 110 and the bottom plate 120, respectively. Correspondingly, the keycap 110 has coupling mechanisms 112, 114 for rotatably coupling the rotatable portions 332a, 334a, respectively, and the bottom plate 120 has coupling mechanisms 122, 124 for slidably coupling the slidable portions 332b, respectively. 334b. It should be noted here that, as shown in FIG. 5A, when the circuit structure 340 is disposed above the bottom plate 120, the circuit structure The 340 has holes 340a, 340b corresponding to the coupling mechanisms 122, 124 of the bottom plate 120 such that the coupling mechanisms 122, 124 can couple the slidable portions 332b, 334b of the brackets 332, 334 through the holes 340a, 340b. Similar to the above, the circuit structure 340 can be disposed above the bottom plate 120 (as shown in FIG. 5B) or below (as shown in FIG. 5C), and can have any suitable aspect of the above embodiments (see FIGS. 1~4C). Shown), no longer repeat here. It should be noted that when the circuit structure 340 is disposed under the bottom plate 120, the bottom plate 120 preferably has a switch hole 128, wherein the switch hole 128 corresponds to the switch circuit of the circuit structure 340 (ie, the position of the hole 144a corresponding to the spacer layer 144). In order to cause the keycap 110 to be pressed, the triggering portion 118 passes through the switch hole 128 to trigger the circuit structure 340 to generate a trigger signal.

In the embodiment shown in FIG. 5C , the circuit structure 340 is disposed under the bottom plate 120 , and the bottom plate 120 further has a receiving hole 125 , and the light emitting element 150 is partially received in the receiving hole 125 . For example, the circuit structure 340 can be a circuit structure 140 similar to that of FIG. 1 , wherein the light emitting element 150 is electrically connected to the light source circuit 152 formed on the upper surface of the second circuit board 146 and disposed to protrude above the second circuit board 146 . The surface is exposed through the spacer layer 144 from the light source through hole 1424 of the second circuit board 142, and is partially received in the receiving hole 125 of the bottom plate 120.

Compared with the prior art, the button structure of the present invention can simplify the circuit design and increase the integration feasibility by integrating the circuit structure of the switch circuit and the light source circuit. Furthermore, the key structure of the present invention has a circuit structure composed of a circuit layer of a silver paste printed circuit and a hard printed circuit board of a copper wire, thereby reducing circuit impedance and improving soldering feasibility of the light emitting element and/or the electronic component.

The present invention has been described by the above embodiments, but the above embodiments are for illustrative purposes only and are not intended to be limiting. It will be apparent to those skilled in the art that the embodiments specifically described herein may have other modifications of the embodiments. Accordingly, the scope of the invention is intended to cover such modifications and are only limited by the scope of the appended claims.

100‧‧‧Key structure

110‧‧‧Key Cap

112, 114‧‧‧ coupling mechanism

120‧‧‧floor

122, 124‧‧‧ Linked institutions

126‧‧‧Component hole

130‧‧‧ Lifting mechanism

132‧‧‧First bracket

134‧‧‧second bracket

140‧‧‧Circuit structure

140a, 140b‧‧‧ hole

141‧‧‧Switch circuit

142‧‧‧First board

1422‧‧‧First switch circuit

144‧‧‧ spacer

144a‧‧‧ first hole

146‧‧‧Second circuit board

1462‧‧‧Second switch line

1464‧‧‧Component lines

150‧‧‧Lighting elements

152‧‧‧Light source circuit

152a, 152b‧‧‧ copper wire

160‧‧‧Response unit

162‧‧‧Trigger

170‧‧‧Electronic components

Claims (10)

A key structure includes: a bottom plate; a key cap movably disposed above the bottom plate relative to the bottom plate; a circuit structure disposed under the key cap, the circuit structure comprising: a first circuit board having The first conductive material forms a first switch line on the lower surface of the first circuit board; and a second circuit board has a second switch line formed by a second conductive material on the upper surface of the second circuit board The second conductive material has a lower impedance than the first conductive material; and a spacer layer is disposed between the first circuit board and the second circuit board to separate the first switch line and the second switch line; And a light-emitting element disposed on the second circuit board and electrically connected to the second circuit board to provide light, wherein when a pressing force is applied to the key cap, the key cap moves toward the bottom plate to make the first circuit The board is deformed downward so that the first switch line contacts the second switch line, thereby generating a trigger signal. The button structure of claim 1, wherein the first conductive material is silver paste and the second conductive material is copper or gold. The button structure of claim 1, wherein the first circuit board further has a light source perforation, the second circuit board has a light source circuit, and the light source circuit is formed by the second conductive material on the second circuit board. In the upper surface, the light-emitting element is electrically connected to the light source circuit and disposed to protrude from an upper surface of the second circuit board to be exposed from the light source through the spacer layer. The button structure of claim 1, wherein the second circuit board has a light source circuit, the light source circuit is formed on the lower surface of the second circuit board by the second conductive material, and the light emitting element is electrically connected to the light source The circuit is disposed on a lower surface of the second circuit board. The key structure of claim 4, wherein the circuit structure further comprises a protective layer disposed on the lower surface of the second circuit board to cover the light source circuit, the protective layer having a broken hole, The light emitting element is exposed from the hole. The button structure of claim 4, wherein the circuit structure further has a light source hole, the light source hole penetrating the first circuit board, the spacer layer and the second circuit board, and the light emitting element is from the second circuit board The lower surface passes through the light source aperture to provide the light in the direction of the keycap. The key structure of claim 3, wherein the circuit structure is disposed under the bottom plate, the bottom plate further has a receiving hole, and the light emitting component is partially received in the receiving hole. The button structure of any one of claims 1 to 3, further comprising an electronic component, wherein the circuit structure is disposed above the bottom plate, and the bottom plate further has a component hole, and the second circuit board has a component a circuit, the component circuit is formed on the lower surface of the second circuit board by the second conductive material, and the electronic component is electrically connected to the component line and protrudes from a lower surface of the second circuit board to at least partially receive In the hole of the component. The button structure of any one of claims 1 to 3, further comprising an electronic component, wherein the circuit structure is disposed under the bottom plate, the first circuit board further has a component perforation and the second circuit board further has An element line formed by the second conductive material on an upper surface of the second circuit board, the bottom plate further having a component hole and a switch hole, the electronic component electrically connecting the component line and passing through the component The through hole is at least partially received in the hole of the component, and the light emitting element is exposed from the switch hole. The button structure of claim 9, wherein the first switch line and the second switch line are disposed corresponding to the switch hole, and the first circuit board is turned to the switch hole through the switch hole when the key cap moves toward the bottom plate The lower deformation causes the first switch line to contact the second switch line to generate the trigger signal.