Pressing device

Abstract

The present invention provides a pressing device having an induction coil and triggered by a change in induced current. [Solution] The pressing device includes a circuit board, a lower shaft cover, an upper shaft cover, and a movable shaft. The circuit board includes a first surface and a second surface, a through hole penetrating the first and second surfaces, and an induction coil surrounding the through hole. The lower shaft cover includes a lower cover base and a hollow shaft base protruding from the lower cover base. The lower cover base is mounted on the first surface. The upper shaft cover is mounted on the lower cover base and includes an opening. The movable shaft is movably mounted between the upper shaft cover and the lower shaft cover and includes a movable base and a columnar shaft protruding from the movable base. The movable base partially protrudes from the opening, and a sensor component is connected to the columnar shaft. When the movable shaft is pressed down, the columnar shaft extends into the hollow shaft base, the sensor component passes through the through hole, and causes a change in the induction current in the induction coil.

Description

Technical Field

[0001] The present invention relates to a pressing device, and more particularly to a pressing device having an induction coil.

Background Art

[0002] Currently, a common pressing device is triggered by pressing a button to turn on a lower switch. With the progress of technology, how to provide various triggering methods for pressing devices has become a research direction in this field.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The present invention provides a pressing device having an induction coil and triggered by a change in induced current.

Means for Solving the Problems

[0004] The pressing device of the present invention includes a circuit board, a lower shaft cover, an upper shaft cover, and a moving shaft body. The circuit board includes a first surface and a second surface facing each other, a through hole penetrating the first surface and the second surface, and an induction coil surrounding the through hole. The lower shaft cover includes a lower cover base and a hollow shaft base protruding from the lower cover base, and the lower cover base is installed on the first surface. The upper shaft cover is installed on the lower cover base and includes an opening. The moving shaft body is movably installed between the upper shaft cover and the lower shaft cover and includes a moving base and a columnar shaft center protruding from the moving base. The moving base partially protrudes from the opening, and a sensor component is connected to the columnar shaft center. When the moving shaft body is pushed down, the columnar shaft center extends into the hollow shaft base, and the sensor component passes through the through hole, causing a change in the induced current in the induction coil.

[0005] In one embodiment of the present invention, the pressing device described above further includes a light emitter and a light receiver, the hollow shaft base includes two flap sections separated from each other, an optical path is formed between the two flap sections, the light emitter and the light receiver are mounted on the second surface and located on both sides of the two flap sections, and when the moving shaft body is not yet pressed down, light emitted from the light emitter is received by the light receiver via the optical path.

[0006] In one embodiment of the present invention, when the moving shaft is pushed down, the sensor component is positioned in the optical path, and the light emitted from the light emitter is blocked by the sensor component.

[0007] In one embodiment of the present invention, the columnar axis of the moving shaft described above is opaque, and when the moving shaft is pushed down, the columnar axis is located in the optical path, and the light emitted from the light emitter is blocked by the columnar axis.

[0008] In one embodiment of the present invention, the pressing device described above further includes a magnetic sensor mounted on a circuit board and located near a hollow shaft base, wherein the sensor component is a magnet, and when the moving shaft is pressed down, the magnet moves closer to or away from the magnetic sensor by passing through a through hole.

[0009] In one embodiment of the present invention, the magnetic sensor described above is installed on the first surface.

[0010] In one embodiment of the present invention, the magnetic sensor described above is installed on the second surface.

[0011] In one embodiment of the present invention, the magnet described above is rectangular in shape.

[0012] In one embodiment of the present invention, the pressing device described above further includes an elastic body located between the lower shaft cover and the upper shaft cover and fitted to the columnar axis, and is used to return the pushed-down movable shaft to its original position.

[0013] In one embodiment of the present invention, the pressing device described above further includes a metal spring plate installed between the lower shaft cover and the upper shaft cover, providing tactile feedback when pressed.

[0014] In one embodiment of the present invention, the pressing device described above further includes a cushioning member, the movable shaft includes a positioning portion protruding from the side of the movable base, the cushioning member is fitted to the positioning portion of the movable shaft, and the positioning portion is located between the lower shaft cover and the upper shaft cover.

[0015] In one embodiment of the present invention, when the movable shaft is not yet pushed down, the cushioning member contacts the upper shaft cover, and when the movable shaft is pushed down, the cushioning member contacts the lower shaft cover.

[0016] In one embodiment of the present invention, the opening described above is rectangular, and the outer contour of the moving base corresponds to the inner contour of the opening.

[0017] In one embodiment of the present invention, the lower shaft cover described above includes a first engaging portion, and the upper shaft cover includes a second engaging portion corresponding to the first engaging portion. [Effects of the Invention]

[0018] As described above, the circuit board of the pressing device of the present invention includes an induction coil surrounding a through hole. The lower cover base of the shaft body lower cover is installed on the first surface of the circuit board. The hollow shaft base is drilled through the through hole and protrudes from the second surface of the circuit board. The shaft body upper cover is installed on the lower cover base. The moving shaft body is installed movably between the shaft body upper cover and the shaft body lower cover and includes a moving base and a columnar shaft center protruding from the moving base. The moving base partially protrudes from the opening of the shaft body upper cover, and a sensor component is connected to the columnar shaft center. When the moving shaft body is pushed down, the columnar shaft center extends into the hollow shaft base, and the sensor component passes through the through hole, bringing about a change in the induced current in the induction coil, thus providing a triggering method different from the conventional one. Also, due to the design of drilling the hollow shaft base through the through hole of the circuit board, a part of the height of the hollow shaft base can be overlapped with the thickness of the circuit board, so the overall height of the pressing device can be reduced, and the pressing device can be applied to a thinner model.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic external view of a pressing device according to an embodiment of the present invention. [Figure 2] It is an exploded view of FIG. 1. [Figure 3] It is a cross-sectional view taken along the line A-A of FIG. 1. [Figure 4] It is a schematic view when the moving shaft body in FIG. 3 is pushed down. [Figure 5] It is a cross-sectional view of a pressing device according to another embodiment of the present invention. [Figure 6] It is a schematic view when the moving shaft body in FIG. 5 is pushed down. [Figure 7] It is a schematic external view of the bottom surface of the pressing device in FIG. 5. [Figure 8] It is a cross-sectional view of a pressing device according to another embodiment of the present invention. [Figure 9] It is a schematic view when the moving shaft body in FIG. 8 is pushed down. [Figure 10] It is a cross-sectional view of a pressing device according to another embodiment of the present invention. [Figure 11] It is a cross-sectional view of a pressing device according to another embodiment of the present invention. [Figure 12] It is another cross-sectional view of the pressing device of FIG. 11.

Embodiments for Carrying Out the Invention

[0020] FIG. 1 is a schematic external view of a pressing device according to one embodiment of the present invention. FIG. 2 is an exploded view of FIG. 1. FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1. FIG. 4 is a schematic view when the moving shaft body of FIG. 3 is pushed down.

[0021] Referring to FIGS. 1 to 4, the pressing device 100 of the present embodiment is, for example, a part hidden under the key cap of a key on a keyboard, but the type of the pressing device 100 is not limited thereto. As shown in FIG. 2, the pressing device 100 includes a circuit board 110, a shaft lower cover 120, a shaft upper cover 130, and a moving shaft body 140.

[0022] The circuit board 110 includes a first surface 112 and a second surface 114 facing each other, a through hole 116 penetrating the first surface 112 and the second surface 114, and an induction coil 118 surrounding the through hole 116. The induction coil 118 may be installed on the first surface 112 or on the second surface 114. In one embodiment, the induction coil 118 can also be installed on the first surface 112 and the second surface 114. In the present embodiment, the induction coil 118 is provided on the first surface 112, but the installation method of the induction coil 118 is not limited thereto.

[0023] As shown in FIG. 3, the shaft lower cover 120 includes a lower cover base 122 and a hollow shaft base 124 protruding from the lower cover base 122. The lower cover base 122 is installed on the first surface 112, and the hollow shaft base 124 is drilled in the through hole 116 of the circuit board 110 and protrudes from the second surface 114.

[0024] In this embodiment, by designing the hollow shaft base 124 to be drilled in the through hole 116 of the circuit board 110, the height of a portion of the hollow shaft base 124 can be made to overlap with the thickness of the circuit board 110, thereby reducing the overall height of the pressing device 100. Therefore, the pressing device 100 can be applied to thinner models, but is not limited to this. In another embodiment, the lower cover base 122 is installed on the first surface 112, and the hollow shaft base 124 is located inside the through hole 116 of the circuit board 110, meaning that the height of the hollow shaft base 124 is less than or equal to the thickness of the circuit board 110.

[0025] Furthermore, the upper shaft cover 130 is installed on the lower cover base 122. Specifically, as shown in Figure 2, the lower shaft cover 120 includes a first engaging portion 128, and the upper shaft cover 130 includes a second engaging portion 134 corresponding to the first engaging portion 128. The upper shaft cover 130 is fixed to the lower shaft cover 120 by combining the first engaging portion 128 and the second engaging portion 134. Naturally, the method of fixing the upper shaft cover 130 to the lower cover base 122 is not limited to this.

[0026] The upper shaft cover 130 includes an opening 132. The movable shaft 140 is movably mounted between the upper shaft cover 130 and the lower shaft cover 120. The movable shaft 140 includes a movable base 141 and a columnar shaft 145 extending downward from the bottom of the movable base 141. A keycap (not shown) can be mounted on the movable base 141 and moves with the movable base 141. Therefore, when a user presses a keycap, the movable shaft 140 moves downward in response.

[0027] The movable base 141 partially protrudes from the opening 132 of the shaft cover 130. In this embodiment, the opening 132 of the shaft cover 130 is rectangular, and the movable base 141 is rectangular. Since the outer contour of the movable base 141 corresponds to the inner contour of the opening 132, the movable base 141 of the movable shaft 140 is restricted by the edge of the opening 132 of the shaft cover 130, allowing it to move straight up and down. This reduces the side-to-side swaying of the movable shaft 140 during its up-and-down movement, thereby achieving a stable pressing effect.

[0028] Furthermore, the shape of the columnar axis 145 corresponds to the shape of the hollow shaft base 124 of the shaft body lower cover 120. The columnar axis 145 is cylindrical, and the hollow shaft base 124 of the shaft body lower cover 120 is a corresponding cylindrical shape. By positioning the columnar axis 145 with a matching outer contour and the inner contour of the hollow shaft base 124, it is possible to ensure that the columnar axis 145 moves stably within the hollow shaft base 124, thereby reducing vibration and achieving a stable pressing effect.

[0029] Furthermore, a sensor component 146 is connected to the columnar axis 145, and the sensor component 146 generates an electric current in the induction coil 118 through the through hole 116. The sensor component 146 is made of a magnetic material (e.g., conductive or comagnetic material), iron, magnet, conductive metal (e.g., aluminum or copper), or silicon steel, or other magnetic field-responsive material or composite material, but is not limited to these. In this embodiment, the columnar axis 145 is hollow, and the sensor component 146 is installed inside the columnar axis 145. In one embodiment, the columnar axis 145 does not have to be hollow, the sensor component 146 may be installed outside the columnar axis 145, and the sensor component 146 may be directly connected to the columnar axis 145 or indirectly connected to the columnar axis 145 via other components, and is not limited to the type of columnar axis 145 and the installation location of the sensor component 146.

[0030] As can be seen in Figure 4, when the movable shaft 140 is pushed down, the columnar axis 145 extends into the hollow shaft base 124, the sensor component 146 passes through the through hole 116, and causes a change in the induced current in the induction coil 118. Therefore, the pressing device 100 can be triggered by the change in the induced current received by the induction coil 118. Specifically, as shown in Figures 3 and 4, the sensor component 146 is located above the circuit board 110, and the induction coil 118 is installed on the first surface 112. As the movable shaft 140 moves toward the circuit board 110, the sensor component 146 approaches the induction coil 118 and passes through the through hole 116, causing the sensor component 146 and the induction coil 118 to sense each other and generate a change in inductance. Alternatively, in one embodiment, the induction coil 118 may be installed on the first surface 112 and / or the second surface 114.

[0031] In another embodiment, the induction coil 118 is installed on the second surface 114, and when the movable shaft 140 is not yet pressed, a portion of the sensor component 146 (bottom) is located within the through hole 116. That is, the portion is located between the first surface 112 and the second surface 114, but the position of the sensor component 146 on the circuit board 110 is not limited to this. Similarly, this arrangement also generates a sensing change as the sensor component 146 approaches the induction coil 118, allowing for the determination of the degree to which the movable shaft 140 is pressed.

[0032] Furthermore, in this embodiment, the pressing device 100 further includes an elastic body 170, which is, for example, a spring, but the present invention is not limited thereto. The elastic body 170 is located between the lower shaft cover 120 and the upper shaft cover 130 and is fitted onto the columnar shaft 145, and is used to return the pressed-down movable shaft 140 to its original position.

[0033] Furthermore, as shown in Figures 2 and 3, the pressing device 100 also includes a metal spring plate 180 installed between the lower shaft cover 120 and the upper shaft cover 130, providing tactile feedback when pressed. Also, as shown in Figure 2, the movable shaft 140 has a protruding column 143 on its side corresponding to the two clamping portions 182 of the metal spring plate 180. When the movable shaft 140 is pressed down, the protruding column 143 slides between the two clamping portions 182 of the metal spring plate 180, and the clamping force on the protruding column 143 by the two clamping portions 182 provides tactile feedback when pressed.

[0034] As shown in Figure 2, the movable shaft 140 includes a positioning portion 142 that protrudes from the side of the movable base 141, and the positioning portion 142 is located between the lower shaft cover 120 and the upper shaft cover 130. The pressing device 100 further includes a cushioning member 190, which is a soft object and, in this embodiment, is annular, but the present invention is not limited thereto. The cushioning member 190 is fitted onto the positioning portion 142 of the movable shaft 140 and is used to avoid situations in which the movable shaft 140 directly strikes the lower shaft cover 120 and the upper shaft cover 130, causing noise when the movable shaft 140 moves.

[0035] The following describes other embodiments of the pressing device. Components that are the same as or similar to those in the previous embodiments are indicated by the same or similar reference numerals, and details are not repeated; only the main differences are described.

[0036] Figure 5 is a cross-sectional view of a pressing device according to another embodiment of the present invention. Figure 6 is a schematic view of the movable shaft of Figure 5 when it is pressed down. Figure 7 is a schematic view of the bottom surface of the pressing device of Figure 5. It should be noted that the cross-sections in Figures 5 and 6 are similar to the cross-section of line BB in Figure 1, and are different from the cross-section of line AA in Figure 1 in Figures 3 and 4.

[0037] Referring to Figures 5 to 7, the difference between the pressing device 100a of this embodiment and the pressing device 100 of Figure 1 is that in this embodiment, the pressing device 100a further includes a light emitter 150 and a light receiver 152. The light emitter 150 may be an LED, but the type of light emitter 150 is not limited to this.

[0038] As can be seen in Figure 7, the hollow shaft base 124 includes two flap sections 126 separated from each other, with a symmetrical opening between the two flap sections 126 through which light passes to form an optical path. The light emitter 150 and light receiver 152 are mounted on the second surface 114 and located on both sides of the two flap sections 126, and in particular, at both ends of the optical path between the two flap sections 126.

[0039] As shown in Figure 5, when the movable shaft 140 is not yet pressed down, the light emitted from the light emitter 150 is received by the light receiver 152 via the optical path. As shown in Figure 6, when the movable shaft 140 is pressed down, the columnar axis 145 and the sensor component 146 are located in the optical path, and since the columnar axis 145 of the movable shaft 140 is opaque, the light emitted from the light emitter 150 is blocked by the columnar axis 145. Therefore, the light receiver 152 cannot receive the light emitted from the light emitter 150. Thus, the pressing device 100a can determine whether it has been triggered by whether the light receiver 152 has received the light.

[0040] Naturally, in one embodiment, the columnar axis 145 of the movable shaft 140 may be translucent. When the movable shaft 140 is pushed down, the light emitted from the light emitter 150 is still blocked by the sensor component 146, so the receiver is also unable to receive the light emitted from the light emitter 150.

[0041] In this embodiment, the pressing device 100a can be triggered by a change in the induced current received by the induction coil 118, and / or by whether the light receiver 152 has received light. The user can select which trigger method to use by setting, or the pressing device 100a can operate multiple trigger methods simultaneously.

[0042] Furthermore, as can be seen in Figure 5, when the movable shaft 140 is not yet pushed down, the cushioning member 190 comes into contact with the upper shaft cover 130. As can be seen in Figure 6, when the movable shaft 140 is pushed down, the cushioning member 190 comes into contact with the lower shaft cover 120. Therefore, the cushioning member 190 can effectively avoid directly hitting the lower shaft cover 120 and the upper shaft cover 130 when the movable shaft 140 moves, thereby reducing the noise generated when a collision occurs.

[0043] Figure 8 is a cross-sectional view of a pressing device according to another embodiment of the present invention. Figure 9 is a schematic view of the movable shaft of Figure 8 when it is pressed down. Referring to Figures 8 to 9, the difference between the pressing device 100b of this embodiment and the pressing device 100 of Figure 1 is that in this embodiment, the pressing device 100b further includes a magnetic sensor 160 which is installed on the circuit board 110 and located near the hollow shaft base 124. In this embodiment, the magnetic sensor 160 is installed on the first surface 112 of the circuit board 110, but the installation position of the magnetic sensor 160 is not limited thereto.

[0044] In this embodiment, the sensor component 146 is a magnet. When the movable shaft 140 is pressed down, the magnet passes through the through hole 116 of the circuit board 110 and moves closer to or away from the magnetic sensor 160. Therefore, the pressing device 100b determines whether it has been triggered by sensing the change in magnetic field lines generated by the magnet moving closer to or away from the magnetic sensor 160.

[0045] In a more preferred embodiment, the sensor component 146 (magnet) is rectangular, but the present invention is not limited thereto. Compared to a cylindrical magnet, the rectangular magnet design is advantageous for the magnetic sensor 160 in detecting changes in magnetic field lines caused by the vertical movement of the magnet, because the magnet faces the magnetic sensor 160 over the largest possible area, allowing for the acquisition of the maximum amount of magnetic field lines.

[0046] Similarly, in this embodiment, the pressing device 100b can be triggered by a change in the induced current received by the induction coil 118, and / or by sensing a change in magnetic field lines generated by the magnet moving closer or further away via the magnetic sensor 160, thereby determining whether it has been triggered. The user can select which method of triggering is used by setting, or the pressing device 100b can operate multiple trigger methods simultaneously.

[0047] Figure 10 is a cross-sectional view of a pressing device according to another embodiment of the present invention. Referring to Figure 10, the difference between the pressing device 100c of this embodiment and the pressing device 100b of Figure 8 is that in this embodiment, the magnetic sensor 160 is installed on the second surface 114 of the circuit board 110. Similarly, even with this arrangement, the pressing device 100c can determine whether it has been triggered by sensing the change in magnetic field lines generated by the movement of a magnet near or far via the magnetic sensor 160.

[0048] Figure 11 is a cross-sectional view of a pressing device according to another embodiment of the present invention. Figure 12 is another cross-sectional view of the pressing device of Figure 11. It should be noted that Figures 11 and 12 are different cross-sections. Figure 11 is similar to cross-section AA of Figure 1, and Figure 12 is similar to cross-section BB of Figure 1.

[0049] Referring to Figures 11 and 12, the difference between the pressing device 100d of this embodiment and the pressing device 100 of Figure 1 is that, in this embodiment, as shown in Figure 11, the pressing device 100d further includes a magnetic sensor 160 installed on the circuit board 110 and located near the hollow shaft base 124. The sensor component 146 is a magnet. The structural arrangement of the pressing device 100d is similar to the structural arrangement in Figure 8. When the movable shaft 140 is pressed down, the magnet passes through the through hole 116 of the circuit board 110 and moves closer to or away from the magnetic sensor 160. Therefore, the pressing device 100d determines whether it has been triggered by sensing the change in magnetic field lines generated by the magnet moving closer to or away from the magnetic sensor 160.

[0050] Furthermore, as shown in Figure 12, the pressing device 100d further includes a light emitter 150 and a light receiver 152, and its structural arrangement is similar to that of Figure 5. When the moving shaft 140 is pressed down, the columnar axis 145 and the sensor component 146 are positioned in the optical path, and the light emitted from the light emitter 150 is blocked by the columnar axis 145 and the sensor component 146. Therefore, the light receiver 152 cannot receive the light emitted from the light emitter 150. Thus, the pressing device 100d can determine whether it has been triggered by whether the light receiver 152 has received light.

[0051] In other words, the pressing device 100d of this embodiment can be triggered by a change in induced current received by the induction coil 118, or / or by sensing a change in magnetic field lines generated by the movement of a magnet near or far via the magnetic sensor 160, or / or by whether the light receiver 152 has received light. The user can select which method of triggering is used by setting, or the pressing device 100d can operate multiple trigger methods simultaneously.

[0052] As described above, the circuit board of the pressing device of the present invention includes an induction coil surrounding a through-hole. The lower cover base of the lower shaft cover is installed on the first surface of the circuit board, and the hollow shaft base is drilled in the through-hole and protrudes from the second surface of the circuit board. The upper shaft cover is installed on the lower cover base. The movable shaft is movably installed between the upper shaft cover and the lower shaft cover and includes a movable base and a columnar shaft protruding from the movable base, the movable base partially protruding from the opening of the upper shaft cover, and a sensor component is connected to the columnar shaft. When the movable shaft is pressed down, the columnar shaft extends into the hollow shaft base, the sensor component passes through the through-hole, and causes a change in the induction current in the induction coil, thus providing a trigger method different from conventional methods. Furthermore, by designing the hollow shaft base to be drilled in the through-hole of the circuit board, the height of a part of the hollow shaft base can be superimposed on the thickness of the circuit board, so the overall height of the pressing device can be reduced and it can be applied to models with a thinner design. [Industrial applicability]

[0053] The present invention relates to a pressing device having an induction coil, and is applied to buttons. [Explanation of Symbols]

[0054] 100, 100a~100d Pressing device 110 Circuit board 112 Page 1 114 Side 2 116 Through hole 118 Induction Coil 120 Shaft lower cover 122 Lower cover base 124 Hollow shaft base 126 Flap section 128 First engaging part 130 Shaft upper cover 132 Opening 134 Second engagement part 140 Moving Axis Body 141 Mobile Base 142 Positioning section 143 Convex pillar 145 Columnar axis 146 Sensor parts 150 Light emitters 152 Receiver 160 Magnetic Sensors 170 Elastic body 180 Metal spring plate 182 Clamping part 190 Cushioning material

Claims

1. A circuit board including opposing first and second surfaces, through holes penetrating the first and second surfaces, and induction coils surrounding the through holes, The lower cover base includes a lower cover base and a hollow shaft base protruding from the lower cover base, wherein the lower cover base is installed on the first surface of the shaft lower cover, The upper shaft cover, which is installed on the lower cover base and includes an opening, A movable shaft body is installed between the upper shaft cover and the lower shaft cover, and includes a movable base and a columnar axis protruding from the movable base, wherein the movable base partially protrudes from the opening and a sensor component is connected to the columnar axis, A pressing device comprising the moving shaft, wherein when the moving shaft is pushed down, the columnar axis extends into the hollow shaft base, the sensor component passes through the through hole, and causes a change in the induced current in the sensor component.

2. The pressing device according to claim 1, further comprising a light emitter and a light receiver, wherein the hollow shaft base includes two flap portions separated from each other, an optical path is formed between the two flap portions, the light emitter and the light receiver are mounted on the second surface and located on both sides of the two flap portions, and when the movable shaft body is not yet pressed down, light emitted from the light emitter is received by the light receiver via the optical path.

3. The pressing device according to claim 2, wherein when the movable shaft is pushed down, the sensor component is positioned in the optical path and the light emitted from the light emitter is blocked by the sensor component.

4. The pressing device according to claim 2, wherein the columnar axis of the movable shaft is opaque, and when the movable shaft is pushed down, the columnar axis is located in the optical path, and the light emitted from the light emitter is blocked by the columnar axis.

5. The pressing device according to claim 1, further comprising a magnetic sensor installed on the circuit board and located near the hollow shaft base, wherein the sensor component is a magnet, and when the movable shaft is pressed down, the magnet moves closer to or away from the magnetic sensor through the through hole.

6. The pressing device according to claim 2, further comprising a magnetic sensor installed on the circuit board and located near the hollow shaft base, wherein the sensor component is a magnet, and when the movable shaft is pressed down, the magnet moves closer to or away from the magnetic sensor through the through hole.

7. The pressing device according to any one of claims 5 to 6, wherein the magnetic sensor is installed on the first surface.

8. The pressing device according to any one of claims 5 to 6, wherein the magnetic sensor is installed on the second surface.

9. The pressing device according to any one of claims 5 to 6, wherein the magnet is rectangular in shape.

10. The pressing device according to claim 1, further comprising an elastic body located between the lower shaft cover and the upper shaft cover and fitted to the columnar axis, used to return the pushed-down movable shaft to its original position.

11. The pressing device according to claim 1, further comprising a metal spring plate installed between the lower shaft cover and the upper shaft cover, which provides tactile feedback when pressed.

12. The pressing device according to claim 1, further comprising a cushioning member, wherein the movable shaft includes a positioning portion protruding from the side surface of the movable base, the cushioning member is fitted to the positioning portion of the movable shaft, and the positioning portion is located between the lower shaft cover and the upper shaft cover.

13. The pressing device according to claim 12, wherein the cushioning member contacts the upper cover of the shaft when the movable shaft has not yet been pushed down, and the cushioning member contacts the lower cover of the shaft when the movable shaft has been pushed down.

14. The pressing device according to claim 1, wherein the opening is rectangular, and the outer contour of the movable base corresponds to the inner contour of the opening.

15. The pressing device according to claim 1, wherein the lower shaft cover includes a first engaging portion, and the upper shaft cover includes a second engaging portion corresponding to the first engaging portion.

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