JPWO2019103032A1 - Push switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a good click feeling and a predetermined stroke amount when the contact spring is pushed in, while making the housing structure uncomplicated and not requiring adjustment of the legs of the contact spring. A push switch (1) includes a first fixed contact (3), a second fixed contact (4) arranged around the first fixed contact (3), a first fixed contact (3), and the like. A dome-shaped contact spring (5) arranged above the second fixed contact (4) is provided. The contact spring (5) includes a center (5a) that contacts the first fixed contact (3), and a plurality of legs that project outward from the center (5a) and come into contact with the second fixed contact (4). .. The plurality of legs are on the first leg (5b) having the tip portion above the second fixed contact (4) and in a position not in contact with the second fixed contact (4) and on the second fixed contact (4). The second fixed contact (4) is composed of a second leg (5c) having a tip at a position where it comes into contact with the second fixed contact (4). [Selection diagram] Fig. 1

Description

The present application relates to a push switch that makes it easy to secure a predetermined stroke amount and obtain a good click feeling when the contact spring is pushed in.

Push switches used as operation signal input switches for various electronic devices such as keyboards of personal computers and mobile phones are arranged above both peripheral fixed contacts and central fixed contacts provided on the board, for example. It is equipped with a contact spring, and the contact spring is pushed in and inverted to make the peripheral fixed contact and the central fixed contact conductive.

In the push switch configured as described above, it is important to obtain a predetermined stroke amount and a good click feeling when the contact spring is pushed in, so even if the push switch is made smaller and thinner. , It is an issue to obtain a predetermined stroke amount and a good click feeling. In particular, in a thin switch such as a membrane switch, there is room for improvement in ensuring a good feel when the switch is pressed and ensuring a predetermined stroke amount.

Patent Document 1 describes a small push button switch having a contact spring with a leg. This push button switch has dimensions according to the difference between the height positions of the lower ends of the two opposing legs and the lower ends of the remaining two legs among the four legs when the contact spring is formed from the hoop material. By the amount, the height position of the peripheral fixed contact on which the two opposing legs are mounted is formed higher than the receiving surface on which the remaining two legs are mounted. By doing so, the contact spring is supported by the housing in a stable posture via the four legs, and it becomes easy to secure the stroke amount.

Japanese Unexamined Patent Publication No. 2004-55343

In the push button switch of Patent Document 1, since the mounting positions of the legs in the housing are changed so that the height positions of the lower ends of the four legs of the contact springs are the same, the structure of the housing is complicated and the cost is increased. there is a possibility. In addition, it is necessary to adjust the length and bending shape of the legs so that the height positions of the legs are the same.

Therefore, the problems to be solved by the present application are that the housing structure is not complicated and the adjustment of the leg portion of the contact spring is not required, but when the contact spring is pushed in, a good click feeling is obtained and a predetermined stroke amount is obtained. Is to secure.

The push switch according to the present application includes a first fixed contact, a second fixed contact arranged around the first fixed contact, and a dome-shaped contact spring arranged above the first fixed contact and the second fixed contact. The contact spring is provided with a center in contact with the first fixed contact and a plurality of legs protruding outward from the center and contacting the second fixed contact, and the plurality of legs are above the second fixed contact. It is composed of a first leg having a tip portion at a position not in contact with the second fixed contact, and a second leg having a tip portion at a position contacting the second fixed contact on the second fixed contact. Will be done.

Further, in the push switch according to some embodiments of the present application, a plurality of first legs of the contact spring and a plurality of second legs having a length longer than the first leg are alternately arranged around the center of the contact spring. Will be done.

The push switch according to the present application is provided with a first leg having a tip portion above the second fixed contact toward the outside of the center of the contact spring and at a position not in contact with the second fixed contact. The stroke amount can be increased by the distance until the tip of the first leg comes into contact with the second fixed contact when the first leg is pushed in. Further, after the first leg comes into contact with the second fixed contact, the load when pushing the contact spring increases, so that a good click feeling can be obtained.

Further, the push switch according to some embodiments of the present application is provided with a plurality of first leg and a plurality of second legs extending outward from the center of the contact spring longer than the first leg, respectively, and the center of the contact spring. Since they are arranged alternately around the switch, the entire contact spring can be pushed in in a well-balanced and even manner, a good click feeling can be obtained, and a reliable switch operation can be confirmed.

It is an exploded perspective view of the push switch which concerns on 1st Embodiment of this application. It is a top view of the push switch. FIG. 2 is a sectional view taken along line III-III of FIG. FIG. 2 is a sectional view taken along line IV-IV of FIG. It is a cross-sectional view similar to FIG. 4 when the contact spring is lightly pushed in. It is a top view of the push switch when the contact spring is pushed strongly. 6 is a sectional view taken along line VII-VII of FIG. FIG. 6 is a cross-sectional view taken along the line VIII-VIII of FIG. It is a graph which shows the relationship between the load and displacement when the contact spring is pushed. It is a top view which omitted the sheet material of the push switch which concerns on 2nd Embodiment of this application. It is a sectional view of XI-XI of FIG. It is an exploded perspective view which shows the contact spring and the cover of the push switch which concerns on 3rd Embodiment of this application. It is a perspective view of the contact spring of the push switch which concerns on 3rd Embodiment, and the lower surface side of a cover. It is sectional drawing corresponding to the XIV-XIV cross section of FIG. 13 of the push switch which concerns on 3rd Embodiment.

Hereinafter, embodiments of the push switch according to the present application will be described in detail with reference to the drawings. The drawings schematically represent the push switch of the present application. The dimensions and dimensional ratios of these physical objects do not always match the dimensions and dimensional ratios on the drawings. In addition, duplicate explanations may be omitted as appropriate, and the same members may be given the same reference numerals. Furthermore, it should be noted that the technical scope of the present application is not limited to the embodiments described below, but extends to the content of the claims and their equivalents.

(First Embodiment)
1 to 4 show a push switch 1 according to the first embodiment of the present application. The push switch 1 is provided on a housing 2 having a rectangular storage portion 2a, a first fixed contact 3 arranged in the central portion of the storage portion 2a, and a peripheral portion of the storage portion 2a so as to surround the first fixed contact 3. The second fixed contact 4 to be arranged, the contact spring 5 having a dome shape as a whole and the contact spring 5 arranged in the housing portion 2a so as to cover the first fixed contact 3 and the second fixed contact 4. A thin sheet material 6 that covers the upper surface and is adhesively fixed to the upper surface of the outer peripheral wall portion 2b of the housing 2 is provided.

The first fixed contact 3 is made of a smooth circular conductive metal plate arranged in the central portion of the accommodating portion 2a, and is formed on the lower surface of the housing 2 via the through hole 7 (not shown). ) Is electrically connected. Further, the second fixed contact 4 is made of a band-shaped conductive metal plate formed along the peripheral edge portion of the accommodating portion 2a, and another electrode terminal formed on the lower surface of the housing 2 via the through hole 8 (FIG. (Not shown) is electrically connected.

The contact spring 5 has a dome shape as a whole, and includes a center 5a located above the first fixed contact 3 and eight legs 5b and 5c protruding outward from the center 5a and extending radially. .. Each of the eight legs 5b and 5c has tip portions 5d and 5e for contacting the second fixed contact 4. The contact spring 5 is made of a metal plate having a spring property, and the center 5a and the eight legs 5b and 5c are integrally molded by one metal plate. Further, the center 5a of the contact spring 5 has a gentle curved surface, and is constant between the lower surface of the center 5a and the housing portion 2a of the housing 2 including the first fixed contact 3 as shown in FIGS. 3 and 4. The gap c is secured. The center 5a of the contact spring 5 has a structure that reverses when pressed, and reverses and comes into contact with the upper surface of the first fixed contact 3.

The eight legs have four first legs 5b and four legs having a length extending outward from the center 5a of the contact spring 5 than the first leg 5b, that is, a length extending to the tip portion 5d. It consists of a second leg 5c. In this embodiment, the four first legs 5b are wider than the second legs 5c, and have a length extending outward from the center 5a of the contact spring 5, that is, a length up to the tip portion 5d. It is short and has a width that gradually expands from the tip of the leg 5d toward the center 5a. Four monopods 5b are arranged at equal intervals around the center 5a, and the angle formed by the two straight lines connecting the center of the center 5a and the two adjacent monopods 5b is 90 degrees. is there. Each of the four first legs 5b projects outward from the center 5a and extends diagonally downward. The four first legs 5b are arranged so as to face the corresponding central portions of the four outer peripheral wall portions 2b of the housing 2, and the tip portion 5d of each of the first legs 5b is the peripheral edge portion of the storage portion 2a. It reaches near the upper surface of the second fixed contact 4 formed in. Further, the tip portion 5d of the first leg 5b is located at a position separated upward from the upper surface of the second fixed contact 4. That is, when not operating, the tip portion 5d of the first leg 5b is not in contact with the upper surface of the second fixed contact 4, and when the contact spring 5 is pressed, the first leg 5b is elastically deformed to form the second fixed contact. Contact 4.

On the other hand, each of the four second legs 5c has an elongated strip shape. One second leg 5c is provided between two adjacent first legs 5b, and like the first leg 5b, four are arranged at equal intervals around the center 5a and adjacent to the center of the center 5a. The angle formed by the two straight lines connecting the two second legs 5c is 90 degrees. Each of the four second legs 5c projects outward from the center 5a and extends diagonally downward. In this embodiment, on the outer circumference of the center 5a, the adjacent first legs 5b have a curved shape, and the second leg 5c protrudes outward from the center of each curved shape. The four second legs 5c extend toward the corners of the outer peripheral wall 2b of the housing 2, and each tip portion 5e of the second leg 5c reaches each corner portion 2c of the storage portion 2a, and the second fixed contact 4 Contact the top surface of the. Each tip portion 5e of the four second legs 5c is in constant contact with the upper surface of each second fixed contact 4 at the corresponding corner portion 2c. This point is different from the first leg 5b. The second leg 5c is elastically deformed when the center 5a of the contact spring 5 is pressed, and the tip portion 5e of the second leg 5c slides on the upper surface of the second fixed contact 4. The tip portion 5e of the second leg 5c has a shape that slightly warps upward when the center 5a of the contact spring 5 is pressed. Therefore, when each tip portion 5e of the second leg 5c slides on the upper surface of the second fixed contact 4, the contact resistance between each tip portion 5e of the second leg 5c and the upper surface of the second fixed contact 4 becomes smaller.

In the present embodiment, the four first legs 5b and the four second legs 5c are alternately and evenly spaced around the center 5a of the contact spring 5, so that the entire contact spring 5 is evenly balanced. Can be pushed into. As a result, a good click feeling can be obtained and a reliable switch operation can be confirmed. The same applies to the three first legs 5b'and the three second legs 5c' in the second embodiment described later.

The housing 2 is a quadrangular molded product. On the lower surface of the housing 2, one electrode terminal (not shown) led out from the first fixed contact 3 via the through hole 7, and the other being led out from the second fixed contact 4 via the through hole 8. The electrode terminals (not shown) are integrally molded. The storage portion 2a of the housing 2 is sealed by a sheet material 6 that covers the upper part of the contact spring 5. The outer shape of the housing 2 and the shape of the accommodating portion 2a are not limited to a quadrangle, and may be a circular shape or another shape. When the shape of the accommodating portion 2a is circular, the second fixed contact 4 formed on the peripheral edge of the accommodating portion 2a is also a circular ring.

The movement of the push switch 1 having the above configuration will be described with reference to FIGS. 1 to 8. As shown in FIGS. 3 and 4, the push switch 1 in the non-operating state is held in a state where the center 5a of the contact spring 5 is separated from the first fixed contact 3. Therefore, there is no conduction between the first fixed contact 3 and the second fixed contact 4, and the electrical connection is off. The legs are held so that the first leg 5b is not in contact with the upper surface of the second fixed contact 4, while the second leg 5c is held in contact with the upper surface of the second fixed contact 4.

Next, the push switch 1 during operation will be described. First, as shown in FIG. 5, when the center 5a of the contact spring 5 is lightly pushed from above the sheet material 6, the center 5a is elastically deformed in a flat shape and the legs are also elastically deformed. Since the tip 5d of the leg 5b is separated from the second fixed contact 4, the tip 5e of the second leg 5c is until the tip 5d of the first leg 5b comes into contact with the second fixed contact 4. Slides on the upper surface of the second fixed contact 4. At this time, since the second leg 5c is formed longer than the first leg 5b, the center 5a can be lightly pushed in, and the tip portion 5d of the first leg 5b comes into contact with the second fixed contact 4. The stroke amount of the center 5a corresponding to the distance between them can be secured.

Further, as shown in FIGS. 6 to 8, by strongly pushing the center 5a through the sheet material 6 until the center 5a of the contact spring 5 is inverted, the inverted center 5a is brought to the upper surface of the first fixed contact 3. Contact. During that time, the first leg 5b and the second leg 5c slide while keeping their respective tip portions 5d and 5e in contact with the upper surface of the second fixed contact 4. Therefore, the center 5a is pushed in with a strong force, a click feeling is generated, and a stroke amount corresponding to the distance until the center 5a is inverted can be further secured.

When the load applied to the center 5a of the contact spring 5 is removed, the center 5a elastically returns to the original gentle curved surface state, and the first leg 5b and the second leg 5c also elastically return to the original state. Return to. That is, by returning the inversion of the center 5a, a gap c is secured between the center 5a and the first fixed contact 3, and the tip portion 5d of the first leg 5b is separated from the upper surface of the second fixed contact 4 and is moved upward. Moving.

FIG. 9 shows the relationship between the load applied to the center 5a of the contact spring 5 and the displacement of the center 5a at that time in the push switch 1 according to the present application. The push switch 1 as a measurement sample was installed on the plate, the load change when the contact spring 5 of the push switch 1 was pressed with the pusher attached to the tip of the load cell was measured by the load cell, and the displacement was measured by the linear gauge. .. In FIG. 9, P1 is a displacement position when the tip portion 5d of the first leg 5b comes into contact with the second fixed contact 4 when a load is applied to the contact spring 5, and P2 is a displacement position when a load is applied to the contact spring 5. Occasionally, the displacement position when the center 5a of the contact spring 5 is inverted and a part of the center 5a comes into contact with the first fixed contact 3, and P3 is the surface of the first fixed contact 3 with a large area of the center 5a after being inverted. It shows the displacement position at the time of contact.

As described above, the load from the start of pressing the contact spring 5 until it reaches P1 is kept small because only the long second leg 5c comes into contact with the second fixed contact 4. On the other hand, the load between P1 and P2 is the load until the center 5a reverses and contacts the first fixed contact 3, and the first leg 5b and the second leg 5c are elastically deformed and second fixed. Since the load when sliding the upper surface of the contact 4 is applied, the amount is rapidly increased. Further, the load between P2 and P3 is the load until the center 5a is completely inverted and comes into surface contact with the first fixed contact 3 over a wide area, so that the load is reduced from the load at the position of P2.

In FIG. 9, the displacement amount of the contact spring 5 was about 0.3 mm from the start to P1, about 0.7 mm up to P2, and about 1 mm up to P3. When this is compared with the conventional push switch, the displacement from the start to P1 is not seen in the conventional push switch. That is, the displacement from the start to P1 is peculiar to the present application, and is secured as a plus alpha stroke amount when the contact spring 5 is pushed in. Further, in the present application, the load suddenly increases when the displacement is from P1 to P2, while the load suddenly decreases when the displacement is from P2 to P3. That is, when the contact spring 5 is pushed in, the change in the pushing pressure transmitted to the fingers becomes large, and a good click feeling can be obtained.

(Second Embodiment)
10 and 11 show the push switch 1'according to the second embodiment of the present application. The push switch 1'has the same configuration as the push switch 1 of the first embodiment except that the shape of the contact spring 5'arranged in the storage portion 2a of the housing 2 is different, and the housing has a rectangular storage portion 2a. 2, the first fixed contact 3 arranged in the central portion of the housing portion 2a, the second fixed contact 4 arranged on the peripheral portion of the housing portion 2a so as to surround the first fixed contact 3, and the first fixed contact. The entire dome-shaped contact spring 5'arranged in the storage portion 2a so as to cover above the contact 3 and the second fixed contact 4, and the upper surface of the outer peripheral wall portion 2b of the housing 2 that covers the upper part of the contact spring 5'. A thin sheet material 6 which is adhesively fixed to the housing 6 is provided.

The contact spring 5'according to this embodiment has a central 5a' having a gently curved surface located above the first fixed contact 3, and six legs 5b', which protrude outward from the central 5a'and extend radially. It has 5c'. Each of the six legs 5b', 5c' has tip portions 5d', 5e' for contacting the second fixed contact 4. The contact spring 5'is made of a metal plate having a spring property, and the center 5a'and the six legs 5b', 5c' are integrally molded by one metal plate. Further, a certain gap c is secured between the lower surface of the center 5a'of the contact spring 5'and the storage portion 2a of the housing 2 including the first fixed contact 3. The center 5a'has a structure that is inverted by being pressed, and is inverted and comes into contact with the upper surface of the first fixed contact 3.

The six legs are the three first legs 5b'and the three second legs 5c' that extend outward from the center 5a'of the contact spring 5'than the first leg 5b'. Consists of. Similar to the previous embodiment, the three first legs 5b'are wider than the second leg 5c', and the length extending outward from the center 5a'of the contact spring 5'is shorter. Further, it has a width that gradually expands from the tip portion 5d'to the center 5a'. Then, three monopods 5b'are arranged at equal intervals around the center 5a', and the angle formed by two straight lines connecting the center of the center 5a'and the two adjacent first monopods 5b'. Is 120 degrees. Each of the three first legs 5b'protrudes outward from the center 5a' and extends diagonally downward. Each of the three first legs 5b'extend toward the peripheral edge of the storage portion 2a, and each tip 5d'of the first leg 5b' is a second fixed contact 4 formed on the peripheral edge of the storage portion 2a. It reaches near the upper surface of. Further, the tip portion 5d'of the first leg 5b'is located at a position upward away from the upper surface of the second fixed contact 4. Similar to the first embodiment, the tip portion 5d'of the first leg 5b'is not in contact with the upper surface of the second fixed contact 4 when not operating, and when the contact spring 5'is pressed, the tip portion 5d'of the first leg 5b' The tip portion 5d'contacts the upper surface of the second fixed contact 4.

On the other hand, each of the three second legs 5c'has an elongated strip shape. One second leg 5c'is provided between one first leg 5b'and another first leg 5b', and like the first leg 5b', around the center 5a', etc. Three straight lines are arranged at intervals, and the angle formed by two straight lines connecting the center of the center 5a'and the two adjacent second legs 5c' is 120 degrees. Each of the three second legs 5c'projects outward from the center 5a' and extends diagonally downward. On the outer circumference of the center 5a', the adjacent first legs 5b'have a curved shape, and the second leg 5c' extends outward from the center of each curved shape. The three second legs 5c'are alternately arranged one by one with the three first legs 5b' around the center 5a'. The tip portion 5e'of the second leg 5c' reaches above the second fixed contact 4 formed on the peripheral edge of the accommodating portion 2a and is in contact with the upper surface of each of the second fixed contacts 4.

As shown in FIG. 11, the push switch 1'having the above configuration is held in a state where the center 5a'of the contact spring 5'is separated from the first fixed contact 3 when not in operation. Therefore, there is no conduction between the first fixed contact 3 and the second fixed contact 4, and the electrical connection is off. As in the first embodiment, the first leg 5b'is held in a non-contact state with the upper surface of the second fixed contact 4, while the second leg 5c'is in contact with the second fixed contact 4. It is held in a state.

Since the operation of the push switch 1'when the contact spring 5'is pressed is almost the same as that of the first embodiment, detailed description thereof will be omitted. Even in the push switch 1'of this embodiment, since the second leg 5c'is formed longer than the first leg 5b', the center 5a' can be pushed lightly and the first leg 5b' It is possible to secure a stroke amount at the center 5a'for the distance until the tip portion 5d' comes into contact with the second fixed contact 4, and a good click feeling can be obtained.

The number of legs of the contact spring is not limited to that of the first embodiment and the second embodiment. For example, there may be a total of four legs, two first legs and two second legs longer than the first leg. The two first legs are arranged on opposite sides of the outer circumference of the center, and each tip of the two first legs extends to the vicinity above the second fixed contact and is not connected to the second fixed contact 4. It is a contact. On the other hand, the two second legs are arranged on opposite sides of the outer periphery of the center so as to be orthogonal to the first leg. Each tip of the two second legs is in constant contact with the upper surface of the second fixed contact. As described above, in the housing in which the contact springs having a small number of legs are arranged, the shape of the accommodating portion and the shape of the second fixed contact formed on the peripheral edge of the accommodating portion are preferably circular rather than quadrangular.

(Third Embodiment)
12 to 14 show a push switch 1 ″ according to a third embodiment of the present application. This push switch 1'' is different from the push switches 1 and 1'of the first embodiment and the second embodiment in the shape of the contact spring 5'' arranged on the substrate 13, and has a substantially curved surface. A tongue piece-shaped pressing piece 9 is provided at a substantially central portion of the circular center 5a''. The pressing piece 9 is provided so as to be inclined downward from the base end portion 9a toward the tip end portion 9b, and as shown in FIG. 14, of the first fixed contact 3'' arranged on the upper surface of the substrate 13. The tip portion 9b is located above. Further, a second fixed contact 4 ″ is arranged on the upper surface of the substrate 13 so as to surround the first fixed contact 3 ″. The contact spring 5 ″ has four first legs 5b ″ that protrude outward from the center 5a ″ and extend horizontally, and 4 that protrude outward from the center 5a ″ and extend diagonally downward. It has a second leg of the book, 5c''. Further, the length of the four first legs 5b ″ extending outward from the center 5a ″ is shorter than that of the second leg 5c ″.

Further, the push switch 1 ″ has a cover 10 covering the contact spring 5 ″. The lower surface 10a of the cover 10 accommodates the center 5a ″ of the contact spring 5 ″ and the first leg 5b ″ and the second leg 5c ″ that project outward from the center 5a ″ and extend radially. Space 11 is provided. The space 11 recessed in the lower surface 10a of the cover 10 is formed so as to correspond to the shape of the center 5a ″, the shape of the first leg 5b ″, and the shape of the second leg 5c ″, respectively. Further, the space 11 has a pair of bag-shaped spaces 12 into which the tip portion 5d ″ of the first leg 5b ″ is inserted. The pair of bag-shaped spaces 12 are provided corresponding to the two opposing first legs 5b ″ of the four first legs 5b ″. The bag-shaped space 12 holds the tip portion 5d ″ of the inserted first leg 5b ″ so that the cover does not come off from the contact spring 5 ″. Further, the bag-shaped space 12 has a depth such that the first leg 5b ″ can move slightly in the space when the contact spring 5 ″ is pressed.

It is desirable that the cover 10 is formed of an elastic resin such as a urethane resin or a silicone resin so as not to impair the click feeling of the contact spring 5 ″.

Also in the push switch 1 ″ of this embodiment, the length of the second leg 5c ″ to the tip portion 5e ″ is formed longer than the length of the first leg 5b ″ to the tip portion 5d ″. Therefore, the central 5a ″ can be lightly pushed in, and the central 5a ″ of the distance until the tip portion 5d ″ of the first leg 5b ″ comes into contact with the second fixed contact 4 ″. The stroke amount can be secured and a good click feeling can be obtained. In this embodiment, since the contact spring 5 ″ is covered with the cover 10, when the contact spring 5 ″ is pressed, the tip portion 9b of the pressing piece 9 becomes the first fixed contact 3 ″. There is an effect that the collision sound at the time of contact is suppressed by the cover 10.

In the third embodiment, the four first legs 5b ″ protruding outward from the center 5a ″ of the contact spring 5 ″ extend horizontally, but the first leg 5b ″ of the first embodiment And, like the first leg 5b'of the second embodiment, it may be formed so as to extend diagonally downward. By extending the four first legs 5b'' diagonally downward, when the center 5a'' of the contact spring 5'' is pushed in, the tip 5d'' of the first leg 5b'' and the second fixed contact 4 '' Contact with is more reliable.

The contents disclosed in the embodiments of the present application disclose structures that can be combined in various ways, and are not limited to the contents of each embodiment.

1,1', 1'' Push switch 2 Housing 2a Storage part 2b Outer wall part 2c Corner part 3,3'' First fixed contact 4,4'' Second fixed contact 5,5', 5'' Contact spring 5a, 5a', 5a'"Center 5b, 5b', 5b" First leg 5c, 5c', 5c "Second leg 5d, 5d', 5d" First leg tip 5e, 5e', 5e'' Tip of 2nd leg 6 Sheet material 7, 8 Through hole 9 Pressing piece 9a Base end of pressing piece 9b Tip of pressing piece 10 Cover 10a Underside of cover 11 Space 12 Bag-shaped space 13 Substrate

The push switch according to the present application includes a first fixed contact, a second fixed contact arranged around the first fixed contact, and a dome-shaped contact spring arranged above the first fixed contact and the second fixed contact. With,
The contact spring comprises a center in contact with the first fixed contact and a plurality of legs protruding outward from the center and extending diagonally downward to contact the second fixed contact.
A first leg having a tip that is not in contact with the second fixed contact when a plurality of legs are above the second fixed contact and a tip that is in constant contact with the second fixed contact on the second fixed contact. It is composed of a second leg that has
The first leg is formed to be shorter and wider than the second leg, and has a width that gradually expands from the tip thereof toward the center of the contact spring, and the adjacent first legs are adjacent to each other on the outer circumference of the center. A curved shape is formed between the two legs, and the second leg protrudes outward from the central portion of the curved shape.
The tip of the second leg slides on the second fixed contact until the tip of the first leg comes into contact with the second fixed contact due to elastic deformation when the contact spring is pressed.

Claims (14)

It includes a first fixed contact, a second fixed contact arranged around the first fixed contact, and a dome-shaped contact spring arranged above the first fixed contact and the second fixed contact.
The contact spring comprises a center in contact with the first fixed contact and a plurality of legs protruding outward from the center and in contact with the second fixed contact.
A plurality of legs have a tip portion above the second fixed contact at a position not in contact with the second fixed contact, and a tip at a position on the second fixed contact where the second fixed contact comes into contact. A push switch consisting of a second leg having a part. The push switch according to claim 1, wherein the tip of the first leg comes into contact with the second fixed contact due to elastic deformation of the contact spring. The push switch according to claim 1, wherein a plurality of first legs and a plurality of second legs are provided, and the plurality of first legs and the plurality of second legs are alternately arranged around the center of the contact spring. The plurality of first legs are arranged at equal intervals around the center of the contact spring, and the plurality of second legs are arranged one by one between the two adjacent first legs, and the central one is arranged. The push switch according to claim 3, wherein four push switches are arranged around the switch at equal intervals. The plurality of first legs are arranged at equal intervals around the center of the contact spring, and the plurality of second legs are arranged one by one between the two adjacent first legs, and the central one. The push switch according to claim 3, wherein three push switches are arranged at equal intervals around the switch. The push switch according to claim 1, wherein the first leg and the second leg are integrally molded with the center of the contact spring. The push switch according to claim 1, wherein the length to the tip of the first leg is shorter than the length to the tip of the second leg. The push switch according to claim 1, wherein the first leg is formed wider than the second leg, and has a width that gradually expands from the tip end portion of the first leg toward the center of the contact spring. The push switch according to claim 1, wherein a cover for covering the contact spring is arranged, and the cover has a space on the lower surface thereof for accommodating the contact spring. The push switch according to claim 9, wherein the space is recessed in the lower surface of the cover and is formed so as to correspond to the shape of the center of the contact spring, the shape of the first leg, and the shape of the second leg. The push switch according to claim 9, wherein the space has a bag-shaped space in which the tip end portion of the first leg is inserted. The push switch according to claim 9, wherein the contact spring includes a tongue piece-shaped pressing piece at the center of the dome portion, and the tip end portion of the pressing piece is located above the first fixed contact. The push switch according to claim 10, wherein the first leg projects outward from the center of the contact spring and extends horizontally. A housing having a storage portion in which a contact spring is arranged is provided, a first fixed contact is arranged in the central portion of the storage portion, a second fixed contact is arranged in a peripheral portion of the storage portion, and a first fixed contact and a second fixed contact are arranged. The push switch according to claim 1, wherein the contact spring is arranged so as to cover above the contacts.

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