JP2001093368A - Switch and switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch and a switching device, allowing easy continuity test of the switch and easy design of the switch. SOLUTION: A switching device 10 having a plurality of switches 16 each of which consists of a fixed portion 20 having a fixed contact 22 on a substrate and a movable portion 40 having a movable contact 42 opposed to the fixed contact 22 for contacting the fixed contact in response to external thrust, the fixed contacts 22 being of two or more types different in size. The fixed contacts 22 are extended near the peripheral edges R1 of the respective switches 16. The movable contacts 42 are arranged with their conductive planes 420, the number of which is depending on the extension length L of the fixed contacts 22, opposed to the fixed contacts 22, the conduct planes 420 being in the same shape for contacting all fixed contacts 22 during contacting the fixed contacts 22. Further, at least one switch 16 has an emitter 24 fixed to a switch central area R2 for emitting light from the upper face 49 of the movable portion 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large number of switches and switch devices provided on a common substrate, such as operation switches of an electronic musical instrument.

[0002]

2. Description of the Related Art Conventionally, as a switch for operating an electronic musical instrument, a switch driven by a user pressing a movable member such as a push button or a keyboard has been known. In such a switch, the conductive movable contact provided on the movable member by pressing contacts the pair of fixed contacts provided at an interval so as to straddle and conduct between the fixed contact pair, or The electrical circuit is closed by the contact between the contact and the movable contact and the conduction of the wiring connected to both contacts. The electric circuit is closed. The electronic device is designed to perform a predetermined operation by the contact between the fixed contact and the movable contact.

Some switch devices including a plurality of switches as described above include switches having different sizes and shapes. In a conventional switch device including two or more types of switches having different sizes and shapes, a fixed contact provided on a substrate or a movable contact provided on a movable member such as a button so as to correspond to the size of each switch. Had different shapes and sizes. That is,
Large switches have large fixed contacts and movable contacts, and small switches have small fixed contacts and movable contacts. Further, in order to obtain a good contact between the contacts according to the pressing of the switch, the fixed contact and the movable contact are arranged in a shape and a size so as to cover a region near the periphery of the switch.

[0004] By doing so, a contact area between contacts that is as large as possible can be rationally obtained according to the size of the switch, and the contact between the movable contact and the fixed contact can be made more reliable.

[0005] Such switches and their arrangements are also employed in various electric devices other than electronic musical instruments.

[0006]

However, there is a problem caused by different shapes and sizes of the fixed contact and the movable contact. That is, depending on the size and shape of the contact, there may be a difference in good contact between the movable contact and the fixed contact for each switch. This is due to the fact that, in the contact formation step, positional deviation, pattern failure, and the like may occur in different forms depending on the size and shape of the contact. Therefore, it is necessary to test the good contact between the movable contact and the fixed contact for each of the different types of switches, and the test requires a lot of time and labor.

In the design and development stage of the switch device,
It is necessary to test the good contact between the contacts by changing various factors such as the material of the contact and its installation part, the manufacturing method, etc., but if this factor also includes the size and shape of the contact, Prototype or a large number of tests were required, which required a great deal of trouble.

Furthermore, when two types of products are manufactured on the same manufacturing line, switches of different sizes may be used for different types of products, even if each product has a switch having the same shape. . Also in this case, since different sizes of contacts are formed between different types of products, the above-described problem may occur between products,
It was necessary to conduct a switch conductivity test separately for each product type.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the continuity test of switches of different sizes can be performed more easily, and the number of prototypes to be tested in a design and development stage is reduced. It is an object of the present invention to provide such a switch and a switch device.

[0010]

According to the present invention, there is provided a switch device comprising: a fixed portion having a fixed contact provided on a substrate; and a fixed portion provided opposite to the fixed contact, wherein the fixed contact is provided by an external pressure. A contact / separation state is switched, and a plurality of switches each including a movable portion having a movable contact that comes into contact with the fixed contact in the contact state are provided on the same surface; Two or more types of fixed contacts having different sizes are provided as the contacts, and the fixed contacts are extended near the periphery of each switch on the substrate, and the movable contact is extended to the length of the fixed contacts. A corresponding number of conductive surfaces are disposed so as to face the fixed contact,
Each of the conductive surfaces has the same shape and is arranged so as to be in contact with the fixed contact when contacting the fixed contact. In at least one of the plurality of switches, any one of the fixed portion and the movable portion is provided. On the other hand, the above-mentioned object is achieved by the fact that a light emitter for emitting light from the upper surface of the movable part is fixed to the central region of the switch.

[0011] Alternatively, the switch of the present invention is provided with a fixed portion having a fixed contact provided on a substrate, and provided so as to face the fixed contact.
The separated state is switched, and has a configuration including a movable portion having a movable contact that comes into contact with the fixed contact in the contact state, wherein the fixed contact is provided on the substrate near the periphery of the switch, The movable contact is disposed such that a plurality of conductive surfaces face the fixed contact, and the respective conductive surfaces are formed so as to have the same shape and all contact the fixed contact when contacting the fixed contact. The above object is attained by the fact that a light emitter for emitting light from the upper surface of the movable portion is fixed to one of the fixed portion and the movable portion in the central region of the switch.

Alternatively, the switch according to the present invention has a configuration including a fixed portion provided on a substrate and a movable portion cooperating with the fixed portion, wherein the fixed portion is provided on a periphery of the switch on the substrate. A first fixed contact extending closer to the first fixed contact, and a second fixed contact disposed at a distance from the first fixed contact in a central region of the switch; The first fixed contact and the second fixed contact are provided so as to face each other, and contact states with the first fixed contact and the second fixed contact are sequentially obtained at different pressing distances by pressing from the outside. In the state, the first fixed contact and the second fixed contact
The first movable contact has a first movable contact and a second movable contact, and the first movable contact has a number of conductive surfaces corresponding to an extension length of the first fixed contact. The above-described object is achieved by disposing the conductive surfaces in such a manner as to face the fixed contacts, and by forming the same conductive surface so as to come into contact with the first fixed contacts at the time of contact.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a switch and a switch device according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows an operation panel section 1 provided on an electronic keyboard instrument. The operation panel unit 1 includes a switch device 10 for causing a musical instrument to perform a predetermined operation, a rotary knob 92 and a ribbon controller 94, and a display unit 90 including a liquid crystal display device for displaying information such as operation status. And so on. The switch device 10 is installed in a switch device installation section in the operation panel section 1, and is electrically connected to a control device of the electronic musical instrument provided in a different place.

The switch device 10 is provided with a plurality of switches 16 protruding from the operation side surface, and is protected by a protective material made of plastic or the like having an opening at a position corresponding to the switch. This switch device 10
A substrate 12 provided with predetermined wiring, and a cover member 14 provided on the substrate 12 and made of a flexible material such as a soft resin are provided. A plurality of movable parts 40 for a plurality of switches 16 having different sizes are integrally formed on the cover member 14. As shown, the switch device 10
Are provided with a number of switches having different sizes, for example, a large switch 16a on the near side and a small switch 16b on the far side. The arrangement of the switches can be in various forms as required.

FIG. 2 is a plan view showing the substrate 12 of the switch device 10. On the substrate 12, a plurality of switches 16
Are provided. The large switch 16a is provided with a large fixed part 20a, and the small switch 16b is provided with a small fixed part 20b.

In the present embodiment, these fixing portions 20
Is provided with a conductor pattern forming a fixed contact pair. The fixed portion 20 is provided with two comb-tooth-type contact pairs (fixed contacts) 22 extending at intervals R1 (see FIGS. 2 and 4) near the periphery of each switch.
It is constituted by. In each switch 16, the comb-shaped contact pair 22 has an extension length L according to the size of the switch.
(See FIGS. 2 and 5), and the switches of different sizes also have different extension lengths L of the comb-shaped contact pairs. The pair of comb-shaped contacts 22 is configured such that the comb-shaped contacts 22a and 22b are arranged in close proximity to each other in parallel, and the adjacent comb-shaped teeth of the opposing comb-shaped contacts are meshed with each other and spaced from each other. Is placed.

Such a comb-shaped contact pair 22 is formed on a substrate 12 made of a kamiphenol resin or a polyester film.
On the contact pattern portion formed by etching or the like, a conductive material such as a conductive ink containing, for example, carbon is applied or printed. In the comb-shaped contact pair formed in this way, the contacts are formed by long filaments, so that stable conduction between the contact pairs can be obtained.

Further, for example, an LED (light emitting diode) 24 as a light emitter is provided in a switch central region R2 (see FIGS. 2 and 4) between the two comb-shaped contact pairs 22 of the fixed portion 20a corresponding to the large switch 16a. Is provided.
The LED 24 is connected in series to, for example, one contact 22a or 22b of the comb-shaped contact pair. In this case, when the conduction between the pair of comb-tooth-shaped contacts is performed, a current also flows through the LED 24 to emit light, so that the user can visually confirm the ON state of the switch. Alternatively, the LEDs may be connected to an electric circuit independent of the comb-shaped contact pair. For example, the user can be notified of a switch (for example, a keyboard) to be pressed by lighting each LED in a preset order. Such a function can be provided.

In this embodiment, the fixed contact pair is constituted by a comb-shaped contact pair. However, as long as the contact points are close to and parallel to each other, for example, a pair of linear contact points provided in parallel at intervals. Alternatively, various shapes such as a curved contact can be used. In this embodiment, two fixed contact pairs are provided for one switch in the region near the periphery on both sides of the switch. However, one or two or more fixed contact pairs are set to “U” near the periphery of the switch. It may be a form provided in a letter shape or in an annular shape so as to surround the central region of the switch.

FIG. 3 is a bottom view showing the back surface of the cover member 14, that is, the surface facing the substrate 12. As shown in FIG. The cover member 14 is provided with a plurality of movable portions 40 having different sizes and projecting upward at positions corresponding to the plurality of switches 16. Each movable part 40 has a thinner side wall than the top wall and is formed integrally with the surrounding bottom wall so as to be movable by pressing. Further, on the back surface of each movable portion 40, a movable contact 42 constituted by a conductive surface 420 having the same circular shape is provided. The movable contact 42 is fixed to the fixed unit 20.
Are disposed at positions corresponding to the comb-shaped contact pairs 22.

The movable contact 42 is formed, for example, by integrally forming a projection for the movable contact with a cover member based on silicon rubber and applying a conductive ink containing carbon as a main component to the projection. It is constituted by.

To assemble the switch device according to this embodiment, a cover member 14 is put on the substrate 12 and fixed. The substrate 12 is provided with a notch 18
(Shown in FIG. 2) and a projection provided on a support member of the electronic keyboard instrument are engaged and positioned, and are fixed through bolt bolt holes at four corners through fixing bolts. Cover member 1
The cover 4 is positioned on the cover member 14 by engaging a notch 19 (shown in FIG. 3) provided at a central portion on the front side with the protrusion on the support member when the cover member 14 is covered with the cover 12. It is fixed to the substrate 12 by passing a fixing bolt through the provided bolt through hole.

In the switch provided with the LED 24 provided on the substrate, the movable portion 40 is provided with a concave portion 44 for avoiding contact with the LED 24 in a central region of the switch. The movable portion 40 of the switch provided with the LEDs as described above has a transparent or translucent translucent upper surface for transmitting light from the LEDs. However, LED2
4 may be provided on the cover member 14 side by being fixed to the concave portion 44 instead of being provided on the substrate. Also in this case, a predetermined wiring is provided by providing a conductive material mainly composed of carbon or the like along the back surface of the cover member 14,
The current can be supplied to the LED to cause the LED to emit light, for example, by connecting to the wiring on the substrate.

The operation of the switch according to the present invention will be described below.

FIG. 4 shows a cross section of the switch of the switch device of the present embodiment. The movable portion 40 has a thick portion 46 having a movable contact 42 on its surface, and is supported by a thin side wall 48 formed perpendicular to the substrate. The movable contact 42 and the comb-shaped contact pair 2 provided near the periphery R1 of the switch 16
2 are disposed so as to face each other at a predetermined interval in a non-pressed state from the outside.

Next, when the user presses the upper surface 49 of the movable portion from the outside toward the substrate as shown by an arrow F in the drawing, the side wall 48 is bent, and the thick portion 46 moves toward the substrate. The movable contact 42 comes into contact with the comb tooth-shaped contact pair 22 so as to straddle the pair. As a result, conduction between the pair of comb-shaped contact points 22 is obtained, and the switch is turned on.
If desired, when an LED 24 is provided on either the substrate or the cover member, a current is also supplied to the LED through predetermined wiring, and light is transmitted to the movable portion as shown by an arrow E in the figure. From the upper surface 49 of the substrate.

FIGS. 5 and 6 show the positional relationship between the comb-shaped contact pair 22 and the movable contact 42 at the time of contact. FIG. 5 corresponds to the large switch 16a, and FIG.
6b. As can be seen, the movable contact 4
It is desirable that the size of the second conductive surface 420 be sufficiently larger than the inter-contact pitch P of the comb-tooth-type contact pair 22 and be substantially the same as the width of the contact pair. If the pitch between the contacts is not sufficiently large, conduction between the contact pairs will not be satisfactorily obtained, and if the width is larger than necessary than the width of the contact pair, there is a possibility of contact with an adjacent contact pair. It is.

It is desirable to design the pitch between the contacts of the large switch 16a (FIG. 5) and that of the small switch 16b (FIG. 6) at the same pitch (for example, about 1.2 mm). This is because if the pattern of the fixed contact pair is made uniform, the form of contact at the time of contact between the fixed contact pair and the movable contact can be made more uniform. Non-uniformity is unlikely to occur. Therefore, the result of the continuity test on one switch can be reflected on other switches of different sizes, so that the continuity test of the switch device can be performed more easily.

As described above, the movable contact 42 according to the above embodiment is constituted by the conductive surfaces 420 of the same shape having different numbers depending on the extension length of the comb-shaped contact pair 22, and the switch Regardless of the size, the shape of the contact is standardized. Therefore, a difference in the conduction characteristics of the switch caused by a difference in the contact shape is unlikely to occur.

In particular, when the movable section 40 is formed integrally with the cover member 14, the effect is remarkable. This is because the movable contacts of the movable portions of a plurality of switches are formed simultaneously in a single printing process, and the displacement that occurs in this case is considered to be the same for each movable contact. In such a case, if the cover member 14 is positioned by the engagement between the notch 19 and the projection of the support member as described above, a certain positional shift occurs with respect to the substrate 12. As described above, in the case where each movable contact has the same positional displacement, if the shape of the movable contact is the same, the good contact of the movable contact of one switch with the fixed contact pair is tested, If the continuity of the switch is confirmed, the continuity of other switches can be dealt with by applying the test result.

In the configuration in which the number of conductive surfaces of the movable contact is changed according to the extension length of the fixed contact pair as described above, the contact is formed over the area near the periphery of the switch regardless of the size of the switch. For example, even when the user presses the end of the switch, the movable contact provided in this portion can contact the fixed contact pair so as to straddle the fixed contact pair. Will be

In the present embodiment, the movable contact 4
Although the second conductive surface 420 is circular, it may be configured in various shapes such as an oval, a square, and a triangle. In a small switch, the movable contact 22 may be provided with one or only one conductive surface 420.

The movable portions of the switches are not integrally formed with the cover member, but are formed separately from each other by being supported on a substrate by an elastic support such as a spring. be able to. Again, in this case,
A movable contact formed of a conductive surface having the same shape regardless of the size of the switch is provided on a surface of the movable portion facing the substrate.

(Embodiment 2) FIGS. 7 and 8 show a touch response type key switch used in a keyboard portion of a keyboard as a switch according to the present invention. In a touch response type key switch, two movable contacts, a first movable contact and a second movable contact, are sequentially contacted with a fixed contact pair in accordance with the depth of key depression.

FIG. 7 shows a vertical sectional structure of the key switch 60 of the present embodiment. The key switch 60 is configured such that, when the movable portion 62 formed of a flexible material is in a non-pressed state,
Peripheral part 62 supported with a gap d1 between it and the substrate surface
a and a central portion 62b supported at a distance d2 from the substrate surface larger than d1.
The movable contact 64a and the second movable contact 64b are provided. These movable contacts 64 are formed on the substrate in the near-peripheral region R1 and the central region R2 of the switch, respectively, by first and second fixed contact pairs 66a and 66b.
It is arranged so that it may face.

FIG. 8 shows the first and second movable contacts 64a and 64b and the first and second movable contacts 64a and 64b at the time of contact (when pressed).
FIG. 10 is a plan view showing a second fixed contact pair 66a and 66b. As can be seen, the first fixed contact pair 66
a is provided such that the comb-shaped electrode pair forms a substantially annular shape,
The second fixed contact pair 66b is provided in a form in which the contact pairs are engaged in a concentric circular shape at the center of the first fixed contact pair 66a. Further, the first and second movable contacts 64a and 64b are formed by the same circular conductive surface 640. These are different in number according to the extension length (dimension) of the first and second fixed contact pairs, and six conductive surfaces 640 are provided for the first fixed contact pair in the peripheral region of the switch. One conductive surface 640 is provided for the second pair of fixed contacts located in the central region of the switch.

As described above, even in a configuration in which a fixed contact pair having a different shape is provided in one switch, the continuity test of the switch can be performed more easily by forming the movable contact with the conductive surface having the same shape. It will be easier.

Next, the operation of the key switch 60 will be described. When the user presses the key for a distance substantially corresponding to the interval d1, the first movable contact 64a is first moved by bending of the movable portion. It contacts the first fixed contact 66a. As a result, conduction between the first fixed contact pair 66a is obtained. Here, the second movable contact 6 provided at the center is provided.
4b and the second fixed contact pair 66b are separated from each other. Next, when the key is pressed by a distance substantially corresponding to the interval d2, the second movable contact 64b moves to move the second fixed contact 6b.
6b.

As described above, the key switch 6 of this embodiment is
In the case of 0, there are two movable contacts that operate in conjunction with each other by pressing the switch, and conduction between the pair of fixed contacts can be obtained in two stages. Conduction between the first fixed contact pair and the second
By detecting the time difference from the conduction between the pair of fixed contacts, the descending speed of the key and the magnitude of the key pressing force can be determined. By using such a touch-response key switch, it is possible to provide the electronic keyboard instrument with a function of changing the volume according to the strength of the player's pressing operation.

In such a key switch,
It is also possible to adopt a configuration in which the LED 24 is provided. LED
24 is disposed in a space above the movable contact in a central region of the movable portion, for example.

The shapes of the first and second fixed contact pairs are not limited to the comb-shaped contact pairs and the contact pairs meshed in concentric circles, but may be linear or curved in parallel with an interval. Various linear contact pairs can be used.

Further, by forming the movable portion to have a predetermined rigidity, a clear difference is generated in the pressing force required for bringing the first movable contact and the second movable contact into contact with the fixed contact pair. Alternatively, a switch that performs two switch operations depending on the degree (depth) of pressing may be used.

Although the switch and the switch device of the present invention have been described with respect to the above two embodiments, other various forms can be adopted. For example, in the first embodiment, a switch device having switches of different sizes has been described. However, in a switch device having switches of the same size, a movable portion including a plurality of conductive contacts having the same shape is provided on a movable portion. It may be configured. Such a device is also described in the first embodiment.
As in the device of FIG.
The structure has an ED. As described above, even when switches having the same size are provided in one switch device, switches having different switch sizes may be manufactured depending on the switch device. When a switch having a different size for each switch device is manufactured in the same factory or line, if the movable contact is formed of one or more conductive surfaces having the same shape, the contact shape can be made uniform. This has the advantage that the continuity test of the switch can be facilitated.

In the above two embodiments, the switching operation is performed by the external contact pressing the movable contact so as to straddle the comb-shaped contact pair provided as the fixed contact. Alternatively, the switch may be configured such that when the fixed contact and the movable contact come into contact with each other, the wiring connected to the two contacts conducts to close the electric circuit. In the case where a movable contact is formed by a plurality of conductive surfaces for one switch, the respective conductive surfaces are electrically connected to each other by a wiring made of a coated or printed conductive material containing carbon.

Further, a switch device in which a part of the switch in the switch device of the first embodiment is a key switch of the second embodiment may be configured. The fixed contact pairs of these switches can be formed on one substrate.

In the above description, a switch has been described which performs an operation of bringing a movable contact into contact with a fixed contact pair by pressing.
A switch having a structure in which the movable contact in contact with the fixed contact pair when not pressed is separated from the fixed contact pair by pressing. The structure described in, for example, Japanese Patent No. 2939331 can be used as the switch-off structure by pressing.

[0048]

As described above, in the switch according to the present invention, each switch has a number of conductive contacts corresponding to the length of the fixed contact extending from the fixed contact extended on the substrate. Surface, and each conductive surface has the same shape as each other. Therefore, even when the size of the switch in one switch device is different, the contact shape of the movable contact is standardized, and the continuity test of the switch is performed. Can be performed more easily.

Also, although switches having the same size are provided in one switch device, when switches having different switch sizes are manufactured for each switch device, the contact shape of the movable contact is similarly defined. As a result, the switch continuity test can be performed more easily.

[Brief description of the drawings]

FIG. 1 is a plan view of an operation panel of an electronic musical instrument having a switch device according to the present invention.

FIG. 2 is a plan view of a substrate included in the switch device of the present invention.

FIG. 3 is a plan view showing a back side surface of a cover member provided in the switch device of the present invention.

FIG. 4 is a partial sectional view of the switch device of the present invention.

FIG. 5 is a diagram showing a contact state between a movable contact and a fixed contact pair in a large switch of the switch device of the present invention.

FIG. 6 is a diagram showing a contact state between a movable contact and a fixed contact pair in a small switch of the switch device of the present invention.

FIG. 7 is a sectional view of a switch according to another embodiment of the present invention.

FIG. 8 is a diagram illustrating a contact state between a movable contact and a fixed contact pair of a switch according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation panel 10 Switch device 12 Substrate 14 Cover member 16 Switch 20 Fixed part 22 Comb-shaped contact pair (fixed contact) 24 Light emitting diode (light emitting body) 40 Movable part 42 Movable contact 46 Movable part thick part 48 Movable part side wall 49 Upper surface of movable part 420 Conductive surface 60 Key switch (switch) 62a First movable part 62b Second movable part 64a First movable contact 64b Second movable contact 66a First fixed contact pair (first fixed contact) 66b Second fixed contact pair (second fixed contact) 640 Conductive surface E Light F External pressure L Extension length R1 Near switch periphery R2 Central region of switch

Claims (3)

[Claims] 1. A fixed portion having a fixed contact provided on a substrate, and a fixed portion provided opposed to the fixed contact, and a contact / separation state with the fixed contact is switched by an external pressure,
A switch provided with a plurality of movable parts having a movable contact in contact with the fixed contact in the contact state, wherein the switch has different sizes as the fixed contact. The switch includes at least two types of fixed contacts, wherein the fixed contacts extend on the board near the periphery of each switch, and the movable contacts have a number of conductive surfaces corresponding to the extension length of the fixed contacts. Each of the conductive surfaces is disposed so as to face the fixed contact, and each of the conductive surfaces has the same shape and is disposed so as to completely contact the fixed contact when contacting with the fixed contact. In one embodiment, a luminous body that emits light from an upper surface of the movable portion to one of the fixed portion and the movable portion is fixed to a central region of the switch. 2. A fixed portion having a fixed contact provided on a substrate, and a fixed portion provided opposite to the fixed contact, and a contact / separation state with the fixed contact is switched by an external pressure,
A movable portion having a movable contact in contact with the fixed contact in the contact state, wherein the fixed contact extends on the substrate near a periphery of the switch, and the movable contact includes a plurality of movable contacts. Are disposed so as to face the fixed contact, and each of the conductive surfaces is
A luminous body which has the same shape and is arranged so as to come into contact with the fixed contact at the time of contact with the fixed contact, and emits light from the upper surface of the movable portion to one of the fixed portion and the movable portion is located at the center of the switch. A switch fixed to an area. 3. A switch comprising: a fixed portion provided on a substrate; and a movable portion cooperating with the fixed portion, wherein the fixed portion extends on the substrate near a periphery of the switch. A first fixed contact, and a second fixed contact arranged at a distance from the first fixed contact in a central region of the switch, wherein the movable section includes the first fixed contact and the first fixed contact. The second fixed contact is provided to face each of the first and second fixed contacts.
Contact states with the first fixed contact and the second fixed contact are sequentially obtained at different pressing distances, and the first movable contact and the second movable contact with the first fixed contact and the second fixed contact in the contact state are obtained. The first movable contact is provided such that a number of conductive surfaces corresponding to an extension length of the first fixed contact is opposed to the first fixed contact, and each of the conductive surfaces is provided. Is a switch having the same shape and arranged so as to make contact with all of the first fixed contacts at the time of contact.