JPH10112244A - Middle point automatic-reset-type rotary switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin rotary switch by pressing a knob in the longitudinal direction of a cylindrical wall to depress and operate a push switch, and making the knob in a thickness direction unnecessary. SOLUTION: When a push switch is used, a rotor 20 is slided, and a point of an elastic body 40 is displaced in the longitudinal direction of a cylindrical wall 11, when a knob is pressed in the longitudinal direction of the cylindrical wall 11. At the same time, a slider 63 is pushed by a slider-pushing part 25, and a snap plate 62 is pushed down, to be simultaneously brought into contact with the exposed parts for push switch 511d, 511e. the rotor 20 is returned to an initial position by the elastic force of the elastic body 40, when the external force is released, and the slider 63 is returned to the initial position, that is, the position where the snap plate 62 is kept into contact with only the exposed part for push switch 511d, by the elastic force of the snap plate 62 and the displacement part 76.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary switch of a midpoint automatic reset type, and more particularly to a rotary switch of a midpoint automatic reset type incorporating a push switch.

[0002]

2. Description of the Related Art A mid-point automatic return type rotary switch is, for example, a so-called jog shuttle for operating fast forward and rewind of a tape on a video deck or the like, a so-called jog rotary switch for selecting a called party stored in a cellular phone or the like. It is used as That is, such a midpoint automatic reset type rotary switch is turned on only when an external force is applied, and returns to the midpoint and is turned off when the external force is released.

A conventional mid-point automatic reset type rotary switch of this type will be described with reference to FIGS. 8 and 9. FIG.

[0004] Such a conventional midpoint automatic return type rotary switch comprises a body 10 having a cylindrical wall 11 erected in the center,
A lead frame 50 composed of five leads 51a to 51e partially exposed and embedded in the body 10, a rotor 20 rotatably supported by the cylindrical wall 11, and provided on the rotor 20; A brush 30 which slides on the rotary switch exposed portions 511b to 511d of the lead frame 50, and an elastic body which is attached to the boss 13 erected on the body 10 and urges the rotor 20 toward a middle point. 40, and a push switch 60 that is turned on only when an external force is applied.

The push switch 60 is a so-called automatic reset type push switch 6 which is turned on only when pressed.
0, the key top 61 and the snap plate 62
And push switch exposure portions 511a and 511e;
It comprises a snap plate 62 and a cylindrical wall 11 for accommodating the key top 61. Then, the key top 61 and the snap plate 62 are housed inside the cylindrical wall 11, and the push switch 60 is formed.

After the push switch 60, the rotor 20, and the like are placed in the body 10 in which the leads 51a to 51e are embedded, a cover 70 is attached. The cover 70 is attached by a welding boss 121 and a small hole 71 formed in the cover 70. The cover 70 is fixed to the body 10 to complete the midpoint automatic return type rotary switch. Then, after this midpoint automatic return type rotary switch is mounted on a remote control device such as a jog shuttle, a knob (not shown) for applying an external force to the rotor 20 is attached to the rotor 20.

However, the push switch 60 of the conventional midpoint automatic reset type rotary switch has a structure in which the key top 61 is pushed downward and the push switch 60 is turned on. As a whole, it has become thicker, and it has become impossible to cope with smaller and thinner electronic devices.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to provide a thinner midpoint automatic reset type rotary switch having a function as a push switch. Is to provide.

[0009]

An automatic midpoint return type rotary switch according to the present invention is a midpoint automatic return type rotary switch including a rotary switch body and a knob.
The rotary switch body includes a body having a cylindrical wall provided on a periphery of a substantially oval opening, a cover that covers the body,
A lead frame partially exposed and embedded in the body, a rotor rotatably supported on the cylindrical wall and slidably supported in the longitudinal direction of the cylindrical wall, and a lead frame provided on the rotor, A brush that slides on the exposed portion of the rotary switch, and is attached to the cylindrical wall to resiliently urge the rotor toward a midpoint, and the rotor slid in the longitudinal direction of the cylindrical wall is returned to its original position. An elastic body that resiliently biases toward a position, and a push switch that is turned on only when an external force is applied to the rotor in a longitudinal direction of the cylindrical wall. A slider pushed out by the rotor slid in the longitudinal direction of the wall, and a guide for conducting the push switch exposed portion of the lead frame by the slider. ; And a section, to a drive shaft of the rotor protruded from the guide groove of the cover, and characterized in that fixing the knob.

[0010] As the conductive portion, for example, a substantially dome-shaped snap plate having conductivity disposed on the bottom surface of the body, and the slider formed by bending the cover and extruded by an external force are vertically displaced. And a displacement portion for causing the snap plate to be pushed by the pushed slider.

Further, the conducting portion may be constituted by a substantially dome-shaped snap plate having conductivity disposed on a side wall of the body, and the snap plate may be pressed by the pushed slider.

Further, the conductive portion may be constituted by a snap portion having an end portion of the exposed portion for the push switch of the lead frame curved, and the snap portion may be pressed by the pushed slider.

[0013]

FIG. 1 is a schematic exploded perspective view of a midpoint automatic reset type rotary switch according to an embodiment of the present invention, FIG. 2 is a schematic exploded perspective view of a rotary switch body, and FIG.
(A), (b) and (c) are a schematic longitudinal sectional view, a schematic plan view and a schematic transverse sectional view of a body, respectively, FIG. 4 is a schematic plan sectional view of a midpoint automatic reset type rotary switch, and FIG. Is a schematic sectional view thereof. FIG. 10 is a schematic plan sectional view of a midpoint automatic reset type rotary switch according to another embodiment of the present invention. It is to be noted that parts and the like that are substantially the same as those of the related art will be described with the same reference numerals.

As shown in FIG. 1, the rotary switch body 1 according to the present embodiment is a rotary switch main body.
00 and a knob 200 for transmitting an external force to the rotor 20 of the rotary switch body 100.

The rotary switch body 100 is shown in FIG.
As shown in FIG. 1, a lead frame 50 including a body 10 having a cylindrical wall 11 erected on the periphery of a substantially oval opening 12 and five leads 51a to 51e partially exposed and embedded in the body 10. A rotor 20 rotatably supported by the cylindrical wall 11 and slidably supported in the longitudinal direction of the cylindrical wall 11 of the rotor 20, and provided on the rotor 20;
Exposed portion 5 for rotary switch of lead frame 50
11a to 511c, and a brush 30 that is attached to a cylindrical wall 11 erected on the body 10 to resiliently urge the rotor 20 toward a midpoint and to extend in a longitudinal direction of the cylindrical wall 11. The elastic body 40 that resiliently urges the rotor 20 slid toward the original position, the cover 70 that covers the body 10, and when an external force in the long axis direction of the cylindrical wall 11 is applied to the rotor 20. And a push switch 60 that is turned on only.

The body 10 is formed of an insulating resin and has a substantially thin dish shape as a whole. The body 10
, A substantially circular peripheral wall 14 and a substantially rectangular peripheral wall 15 are formed, and a groove 1 is provided between the two peripheral walls 14 and 15.
6 are formed. A substantially oval-shaped opening 12 is formed at the center of the inner side of the substantially circular peripheral wall 14 so that its major axis direction coincides with the center of the groove 16. A cylindrical wall 11 is provided upright on the periphery of the substantially oval opening 12. Also,
A substantially circular recess 17 is formed in the center of the inside of the substantially rectangular peripheral wall 15. Further, a pair of locking claws 19 for attaching the midpoint automatic reset type rotary switch to a printed circuit board (not shown) is provided at an edge of the body 10.

The body 10 includes a lead frame 50.
Are embedded by insert molding. Lead frame 5
Reference numeral 0 denotes two leads 51b and 51c, one end of which protrudes from the side surface of the body 10, and three leads 51a, 51d and 51e whose both ends protrude from the side surface of the body 10. Of the five leads 51a to 51e, two leads 51b, 5
1c and one lead 51a, both ends of which protrude from the side surface of the body 10, are exposed inside the substantially circular peripheral wall 14, and are exposed to the rotary switch 511b, 51, respectively.
1c and 511a. The exposed portion 511a for the rotary switch is exposed in a substantially T-shape around the cylindrical wall 11, and the exposed portions 511b and 511 for the remaining rotary switch are exposed.
c is exposed on both the left and right sides.

The remaining two leads 51d and 51e, both ends of which protrude from the side surface of the body 10, are exposed on the bottom surface of the concave portion 17 formed inside the substantially rectangular peripheral wall 15, and are exposed for the push switch. The units 511d and 511e are configured. The push switch exposed portion 511e is
7 is exposed in a substantially circular shape at the center, and the remaining exposed portion 511d for the push switch is exposed in a substantially C shape around the periphery.

Rotor 2 having a circular opening 21 in the center
0 is formed in a substantially fan shape. When the cylindrical wall 11 is inserted into the opening 21, the rotor 20 is supported by an elastic body 40, which will be described later, in a floating state inside the peripheral wall 14, and inside the substantially circular peripheral wall 14 of the body 10, At the same time as being rotatable about the cylindrical wall 11, it is slidable in the longitudinal direction of the cylindrical wall 11. A pair of bosses 22 are provided on the back surface of the rotor 20 so as to protrude from an elastic body 40 described later. On the other hand, a pair of drive shafts 24 that are inserted into guide grooves 72 formed in the cover 70 protrude from the surface of the rotor 20. The pair of bosses 22 and the pair of drive shafts 24 are coaxial.

Further, on the back surface of the rotor 20, a brush 30 that slides on the exposed portions 511a to 511c for the rotary switch is attached.
Is made of a conductive metal plate. On the back surface of the rotor 20, a wall-shaped slider push-out portion 25 is partially formed on the peripheral edge thereof. Therefore, the brush 3
0 is attached between the slider push-out portion 25 and the opening 21.

A cover 70 is provided on the rotor 20. The cover 70 is formed from a stainless metal plate or the like. The cover 70 has a substantially oval central hole 74 into which the cylindrical wall 11 fits. A pair of guide grooves 72 for guiding the drive shaft 24 of the rotor 20 are formed in a long bean shape so as to surround the center hole 74. The dimensions and the like of the guide groove 72 are set in accordance with the rotational movement of the drive shaft 24 accompanying the rotation and movement of the rotor 20. Further, a mounting portion 73 is formed in the cover 70 in a bent shape, and the mounting portion 73 of the cover 70 corresponds to the projection claw 18 protruding from the substantially circular peripheral wall 14 of the body 10.
3 is provided with an engagement hole 75. By engaging the projection claws 18 with the hook holes 75, the hooks 75 can be attached to the body 10 with one touch.

When a part of the cover 70, that is, the cover 70 is attached to the body 10, a substantially rectangular peripheral wall 1 is formed.
A part of the cover 70 is bent obliquely downward so as to be located inside the fifth part 5 to form a displacement part 76.

The push switch 60 is a so-called automatic return type push switch 60 which is turned on only when pressed, and includes a slider pushing portion 25 of the rotor 20, an elastic body 40 described later, a slider 63, and a push switch. And a conducting portion for conducting the exposed portions 511d and 511e. In addition, the conductive portions are exposed to the push switch exposed portions 511 d and 511 e in the recess 17.
, A snap plate 62 that conducts through, a tape 64, and a displacement portion 76 that is formed by bending the cover 70.

The snap plate 62 is formed by curving the center of a round metal plate having conductivity in a convex shape, that is, in a substantially dome shape, and is accommodated in the concave portion 17.
As described above, since the exposed portions 511d and 511e for the push switch are exposed on the bottom surface of the concave portion 17, the peripheral portion of the snap plate 62 is always in contact with the exposed portion 511d for the push switch. Is not contacted with the push switch exposed portion 511e.

The slider 63 is made of an insulating synthetic resin or the like, and has three claws 631a to 631c as a whole.
And has a substantially Y-shape having The three claws 6
Of the 31a to 631c, the tip of the central claw 631b is
The inclined surface is inclined in the same direction as the displacement portion 76.
A guide portion 632 that fits in the groove 16 of the body 10 is integrally formed on the side surface opposite to the claws 631a to 631c. The guide portion 632 is formed longer than the groove 16 and faces the slider pushing portion 25.
The slider 63 moves the guide portion 632 to the body 1.
0 and is mounted on the snap plate 62 with the tape 64 interposed. In addition, the tape 64
In order for the slider 63 to slide smoothly on the snap plate 62 or the snap plate 62
This is for preventing the position from being shifted from a predetermined position in the groove 16 of 0, and any material having an insulating property may be used, and a material made of paper or plastic is used.

When the slider 63 is pushed forward, the tip of the central claw 631b contacts the displacement portion 76 of the cover 70. When the center claw 631b is brought into contact with the displacement portion 76, the pushed slider 63 is displaced by the displacement portion 76.
And the snap plate 62 is pushed down. The depressed snap plate 62 simultaneously contacts the exposed portion 511d for the push switch and the exposed portion 511e for the central push switch. That is, when the slider 63 is pushed out, the push switch 60
Is turned on.

The elastic body 40 which elastically urges the rotor 20 toward the middle point and elastically urges the rotor 20 slid in the longitudinal direction of the cylindrical wall 11 toward the original position. The so-called torsion spring is attached to the body 10 by the cylindrical wall 11. That is, the elastic body 40 is attached to the body 10 by fitting the central circular portion into the cylindrical wall 11. The tip of the elastic body 40 is not easily detached from the boss 22. Although not shown, for example, the tip may be slightly bent in a substantially rectangular shape.

Therefore, when an external force in the rotational direction is applied to the rotor 20, the rotor 20 rotates against the elastic force of the elastic body 40, and when the external force is released, the rotor 20 moves to the middle point by the elastic force of the elastic body 40. It is designed to return. When an external force in the longitudinal direction of the cylindrical wall 11 is applied to the rotor 20, the rotor 20 is pushed in against the elastic force of the elastic body 40, and returns to the original position when the external force is released. Has become.

The knob 200 has a shape like a combination of two semicircles having different diameters. The knob 200 can rotate in the circumferential direction and can slide in the long axis direction of the cylindrical wall 11. Has become. The knob 200
At the center, a claw portion 210 for supporting the center of the cylindrical wall 11 of the body 10 is vertically provided. Also, on the periphery of the semicircular portion 220 where the diameter of the knob 200 is large,
A peripheral wall 221 is formed. Further, the knob 20
0 has two small holes 230 into which the drive shafts 24 protruding from the guide grooves 72 of the cover 70 are fitted.

The push switch 60 and the rotor 2
By attaching the knob 200 to the rotary switch body 100 in which 0 is stored and the cover 70 is mounted, a rotary switch of the automatic resetting of the middle point is completed. Such a midpoint automatic reset type rotary switch
It is used with the peripheral wall 221 of the electronic device 200 exposed from the cabinet of the electronic device.

Next, the operation of the midpoint automatic reset type rotary switch having the above configuration will be described.

[When Used as a Rotary Switch] When the knob 200 is rotated to the right or left against the elastic force of the elastic body 40, the rotor 20 is rotated to the right or left and the tip of the elastic body 40 is Displaced in the direction of rotation. At the same time, the brush 30 is moved to the exposed portion 511 for the rotary switch.
a to 511c are simultaneously contacted by sliding. When the external force is released, the rotor 20 is at the midpoint by the elastic force of the elastic body 40,
That is, the brush 30 is exposed to the rotary switch
It returns to the position where it contacts only a to 511c.

[When used as a push switch] When the knob 200 is pushed in the longitudinal direction of the cylindrical wall 11, the rotor 2
0 slides and the tip of the elastic body 40 is displaced in the long axis direction of the cylindrical wall 11. At the same time, the slider pushing part 2
5, the slider 63 is pushed out. Then, the snap plate 62 is pushed down, and simultaneously contacts the exposed portions 511d and 511e for the push switch. When the external force is released, the rotor 20 returns to the original position by the elastic force of the elastic body 40, and the slider 63 also returns to the original position by the elastic force of the snap plate 62 and the displacement portion 76, that is, the snap plate 62 is exposed to the push switch. It returns to the position where it contacts only the part 511d.

Of course, it is possible to operate the rotary switch and the push switch at the same time, or if the rotor 20 and the slider 63 are formed as shown in FIG. 10, the rotary switch and the push switch cannot be operated at the same time. It is also possible to

That is, in the midpoint automatic return type rotary switch shown in FIG. 10, the rotor 20 is different from that described above. The rotor 20 is provided with a slider pushing section 25.
Instead, a protrusion 251 protrudes toward the slider 63, and the protrusion 251 is formed of two peripheral walls 14 and 15.
Are set slightly smaller than the width dimension of the groove 16 between them. Therefore, when operating as a rotary switch, the protrusion 251 of the rotor 20 is disengaged from the groove 16, so that operation as a push switch, that is, the slider 63 cannot be pushed out by the protrusion 251. In addition, when used as a push switch, the protrusion 251 fits into the groove 16, so that the rotor 20 cannot be rotated. For this reason, in the middle point automatic reset type rotary switch shown in FIG. 10, it is possible to prevent a malfunction in which the rotary switch and the push switch are simultaneously operated.

FIG. 6 is a schematic cutaway sectional view of a midpoint automatic reset type rotary switch according to another embodiment of the present invention.
The push switch exposed portions 511d and 511e of the intermediate point automatic reset type rotary switch are provided with a substantially rectangular peripheral wall 15.
The snap plate 62 is embedded in the peripheral wall 15.
And are arranged in parallel. Therefore, in a state where there is no external force, the tip of the center claw 631b of the slider 63 is in contact with the snap plate 62, and the peripheral edge of the snap plate 62 is always in contact with the push switch exposed portion 511d. Exposed part 511 for push switch
does not touch e.

Therefore, the knob 200 is attached to the cylindrical wall 11.
When an external force in the long axis direction is applied, the slider 63 pushes out the snap plate 62 and simultaneously contacts the exposed portions 511d and 511e for push switches. When the external force is released, the rotor 20 returns to the original position by the elastic force of the elastic body 40, and the slider 63 also moves to the original position by the elastic force of the snap plate 62, that is, the snap plate 62
It returns to the position where it contacts only 1d.

According to this structure, the cover 70 has the displacement portion 7
It is not necessary to provide 6, and the structure can be further simplified.

FIG. 7 is a schematic cut-away sectional view of a midpoint automatic reset type rotary switch according to still another embodiment of the present invention. The exposed portion 511e for the push switch of the rotary switch of the midpoint automatic reset type is exposed inside a concave portion 17 formed in the body 10. The other exposed portion 511d for the push switch extends from the substantially rectangular peripheral wall 15 to a position above the exposed portion 511e for the push switch. Exposed part 5 for push switch
11d is a downwardly curved snap portion 51 at the center thereof.
2 are formed, the ends of which are bent upward. The tip of the claw 631b of the slider 63 can contact the end of the bent snap portion 512.

When an external force in the long axis direction of the cylindrical wall 11 is applied to the knob 200, the snap portion 512 is pressed by the pushed slider 63. Therefore, the curved snap portion 521 is further curved and comes into contact with the remaining push switch exposed portion 511e. When the external force is released,
The rotor 20 returns to the original position by the elastic force of the elastic body 40, and the slider 63 returns to the original position by the elastic force of the snap portion 512. Then, the push switch exposure section 511d and the push switch exposure section 511e.
Returns to the non-contact state.

In this structure, the snap plate 62 is also unnecessary, so that the number of parts can be reduced and the structure can be simplified.

In the above-described embodiment, the description has been given assuming that there are three rotary switch exposure portions 511a to 511c. However, the present invention is not limited to this.
It is also possible to provide two rotary switch exposure parts. Also, leads 51 whose both ends protrude from the body 10 are provided.
Although the exposed portions 511a, 511d, and 511e for push switches are provided by a, 51d, and 51e, only one end may be formed by a lead protruding from the body 10. In these cases, it goes without saying that the lead frame 50 is composed of the leads corresponding to the exposed portions for the rotary switch.

[0043]

According to the present invention, there is provided an automatic mid-point reset type rotary switch comprising a rotary switch main body and a knob, wherein the rotary switch main body has a periphery of a substantially oval opening. A body having a cylindrical wall erected therein, a cover covering the body, a lead frame partially exposed and embedded in the body, and rotatable on the cylindrical wall and slidable in the longitudinal direction of the cylindrical wall. And a brush provided on the rotor and sliding on the exposed portion of the rotary switch of the lead frame, and attached to the cylindrical wall to resiliently urge the rotor toward a midpoint. An elastic body that resiliently urges the rotor slid in the longitudinal direction of the cylindrical wall toward the original position, and applies an external force to the rotor in the longitudinal direction of the cylindrical wall. And a push switch that is turned on only when the push switch is turned on. And a conducting portion for conducting the current, and the knob is fixed to the drive shaft of the rotor protruding from the guide groove of the cover.

The middle-point automatic return type rotary switch having such a configuration, like the conventional middle-point automatic return type rotary switch, presses the knob in the horizontal direction, that is, in the long axis direction of the cylindrical wall, to press the push switch. Since no knob in the thickness direction is required, the switch can be made thinner than a conventional mid-point automatic reset type rotary switch of this type.

The elastic body not only resiliently urges the rotor toward the midpoint, but also urges the rotor slid in the longitudinal direction of the cylindrical wall toward the original position. Therefore, the slid rotor can be reliably returned to the original position. That is, not only the force of the push switch but also the stronger force of the elastic body is used.

In addition, the conductive portion is formed in a bent shape on the cover and has a conductive substantially dome-shaped snap plate disposed on the bottom surface of the body, and displaces the slider pushed out by an external force in a vertical direction. Since the snap plate is configured to be pressed by the pushed-out slider, it is possible to reliably turn on the push switch to slide the knob in the lateral direction.

If the conductive portion is constituted by a substantially dome-shaped snap plate having conductivity arranged on the side wall of the body, and the snap plate is pressed by the extruded slider, the cover is formed. There is no need to provide a displacement portion in the, and the structure can be further simplified.

Further, the conductive portion is constituted by a snap portion having an end portion of the exposed portion for the push switch of the lead frame formed to be curved, and the snap portion is pressed by the pushed slider. If a snap plate is not required, the number of parts can be reduced and the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of a midpoint automatic reset type rotary switch according to an embodiment of the present invention.

FIG. 2 is a schematic exploded perspective view of a rotary switch main body according to the above-mentioned midpoint automatic return type rotary switch.

FIGS. 3A, 3B and 3C are a schematic longitudinal sectional view, a schematic plan view and a schematic transverse sectional view of a body, respectively.

FIG. 4 is a schematic plan sectional view of the midpoint automatic return type rotary switch according to the first embodiment;

FIG. 5 is a schematic cross-sectional view of the above-mentioned midpoint automatic return type rotary switch.

FIG. 6 is a schematic cut-away sectional view of a midpoint automatic reset type rotary switch according to another embodiment of the present invention.

FIG. 7 is a schematic cut-away sectional view of a midpoint automatic reset type rotary switch according to still another embodiment of the present invention.

FIG. 8 is a schematic exploded perspective view of a conventional midpoint automatic reset type rotary switch.

FIG. 9 is a schematic perspective view of the above-mentioned midpoint automatic reset type rotary switch.

FIG. 10 is a schematic plan sectional view of a midpoint automatic reset type rotary switch according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Body 20 Rotor 30 Brush 40 Elastic body 50 Lead frame 60 Push switch 62 Snap plate 63 Slider 70 Cover 100 Rotary switch main body 200 Knob 511a-511c Exposed part for rotary switch 511d, 511e Exposed part for push switch

Claims (4)

[Claims] 1. A mid-point automatic reset type rotary switch comprising a rotary switch main body and a knob, wherein the rotary switch main body has a body with a cylindrical wall standing on the periphery of a substantially oval-shaped opening; A cover that covers the
A lead frame partially exposed and embedded in the body, a rotor rotatably supported on the cylindrical wall and slidably supported in the longitudinal direction of the cylindrical wall, and a lead frame provided on the rotor, A brush that slides on the exposed portion of the rotary switch, and is attached to the cylindrical wall to resiliently urge the rotor toward a midpoint, and the rotor slid in the longitudinal direction of the cylindrical wall is returned to its original position. An elastic body that resiliently urges toward a position, and a push switch that is turned on only when an external force is applied to the rotor in a longitudinal direction of the cylindrical wall. A slider pushed out by the rotor slid in the long axis direction of the cylindrical wall is electrically connected to the exposed portion for the push switch of the lead frame by the slider. A middle point automatic reset type rotary switch, comprising: a conductive portion; and wherein the knob is fixed to a drive shaft of the rotor protruding from a guide groove of the cover. 2. The conductive portion, wherein a conductive substantially dome-shaped snap plate disposed on the bottom surface of the body and a bent portion formed on the cover, displace the slider pushed out by an external force in a vertical direction. The midpoint automatic reset type rotary switch according to claim 1, wherein the snap plate is pressed by the pushed-out slider. 3. The conductive portion is formed of a conductive substantially dome-shaped snap plate disposed on a side wall of the body, and the snap plate is pressed by the pushed slider. The rotary switch according to claim 1, wherein the rotary switch is automatically reset. 4. The lead portion is constituted by a snap portion having a curved end portion of an exposed portion for a push switch of the lead frame, and the snap portion is pressed by the pushed slider. Claim 1
Mid-point automatic reset type rotary switch described in