JP2946401B2 - Rotary switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary switch for turning on and off a switch by rotating a rotary member such as a knob.

[0002]

2. Description of the Related Art Conventionally, in a rotary switch, a desired switch pattern is provided on a substrate, and a contact plate for sliding contact is mounted on a knob disposed on the substrate to rotate the knob. The contact plate is slid into contact with the switch pattern, thereby turning on and off the switch.On the other hand, a desired switch pattern is provided on a rotating knob, and the contact plate is fixed to another member and attached. In some cases, the contact plate is slid in contact with the switch pattern by rotating a knob, thereby turning the switch on and off.

FIG. 7 is a schematic plan view showing an example (pulse switch) of this type of a conventional rotary switch. Referring to FIG. 1, reference numeral 100 denotes a switch substrate provided with a ring-shaped common switch pattern 101 on a circular substrate 102 made of an insulating plate, and provided with radial switch patterns 103 at substantially equal intervals on the outside thereof. The radial switch pattern 103 is bent substantially stepwise at the center.

The common switch pattern 101 is in sliding contact with a common contact plate 105, and the radial switch pattern 103 is in contact with switching contact plates 107, 109.
Are in sliding contact.

When the switch substrate 100 is rotated,
The switching contact plates 107 and 109 repeatedly switch on and off with the radial switch pattern 103, count the number of generated pulses, and simultaneously detect the rotation direction. That is, when the rotating substrate 100 is clockwise, the contact plate 10
7 leads the contact plate 109 by a minute angle, and when counterclockwise, the phase is delayed. That is, if this rotary switch is used, not only the amount of rotation but also the direction of rotation of the rotating substrate 105 can be detected from the phase difference.

[0006]

However, the conventional rotary switch has a structure in which the contact plates 105, 107 and 109 slide on the switch patterns 101 and 103. The wear of the switch patterns 101 and 103 was large and hindered the improvement of durability.

Since the contact plates 105, 107, and 109 are always in elastic contact with the switch substrate 100 on which the switch patterns 101 and 103 are formed, the contact plates 10
So-called sag occurs in the elastic force of 5,107,109,
There was also a risk that the elasticity would become weaker over time.

Further, in the case of the rotary switch shown in FIG. 7, a common switch pattern 101 must be provided in addition to the radial switch pattern 103, and the size of the rotary switch is correspondingly increased, so that downsizing cannot be achieved. There were also problems.

The present invention has been made in view of the above points, and has as its object to reduce the abrasion of the contact plate and the pattern provided on the switch substrate and to reduce the elastic contact force of the contact plate over time. Another object of the present invention is to provide a rotary switch that can be further miniaturized.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a contact forming member provided with a switch contact and a land contact, a base fixed directly to the land contact, and protruding directly from the base. An elastic plate having an arm portion provided with a contact portion for contacting the switch contact, and a rotating body provided with a push-down portion on the lower surface for pushing down the elastic plate, wherein the base of the elastic plate is connected to the land contact The contact portion provided on the arm portion is positioned above the switch contact by directly contacting and fixing the rotating member, and the rotating member is rotatably disposed above the elastic plate, a structure allowed to contact the contact portion to the switch contact by depressing portion provided on the rotating body by rotation of the presses down the arm part of the elastic plate, wherein
The rotating body has a space for storing other functional parts in the center of the rotating body.
A circular knob to be formed and a ring from the outer periphery of the knob
A collar provided so as to protrude in the shape of
The lower part of the ring is provided with a depressed part arranged in a ring shape.
The circuit board constituting the contact forming member is a synthetic resin sheet
Fixed between the contact forming member and the base of the elastic plate.
The mounting plate and the elastic plate disposed on the back surface of the contact forming member
Between the bases of the contacts while holding the contact forming member between them
And the base of the elastic plate of the mounting plate is
A substantially ring-shaped inner projection is provided inside the fixed part,
The inner periphery of the space provided at the center of the rotating body is
The rotating body is rotatably supported by engaging with the periphery .

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a rotary switch (pulse switch) according to an embodiment of the present invention. As shown in FIG.
A switch substrate (contact forming member) 30 and a contact plate (elastic plate) 50 are fixed on the mounting plate 10, a knob (rotating body) 70 is mounted thereon, and a cover 90 is further mounted thereon. Have been. Hereinafter, each component will be described.

The mounting plate 10 is a plate made of a synthetic resin, and has an inner projection 11 and an outer projection 13 which are concentrically arcuate on its surface.
And a substrate mounting surface 15 is formed at a portion between the inner protrusion 11 and the outer protrusion 13.

The inner protrusion 11 and the outer protrusion 13 are provided with notches 17 and 19 for leading out a lead portion 33 of the switch board 30 described below. Further, five small projections 21 are protruded at predetermined positions in the substrate mounting surface 15.

A plurality of through holes 23 are provided at predetermined positions on the outer surface of the outer projection 13 so as to surround the outer projection 13.

Next , a switch substrate 30 serving as a contact forming member
A ring portion 31 formed in a ring shape and the ring portion 31
A circuit board made of a synthetic resin sheet (for example, a PET sheet) having a drawer portion 33 pulled out from one end of the ring portion is prepared, and one land is provided at a predetermined position on the surface of the ring portion 31 .
Land pattern 35 to be a contact and two switch contacts
The contact patterns 37, 39 are formed, and the lead patterns 41, 43, 45 respectively drawn from the patterns 35, 37, 39 are formed so as to be drawn out to the drawer portion 33.

Here, the ring portion 31 is formed in such a size that it can be stored in the board mounting surface 15 of the mounting plate 10.

The land pattern 35 and the contact pattern 3
7, 39 are formed by coating carbon on a silver paste, and the lead patterns 41, 43, 45 are formed by printing an insulating coating on the silver paste.

The small projections 2 of the switch substrate 30
Holes 47 penetrating through the small projections 21 are provided at positions facing 1. In the land pattern 35, three of the holes 47 are provided.

[0019] Then the contact plate 50 made of an elastic plate is made of an elastic metal plate, a flat plate-shaped base portion 51 is constituted by two arms 53 and 55 projecting from one end of the base portion 51 .

The base 51 is provided with a hole 57 penetrating through the three small projections 21 provided on the mounting plate 10.

The arms 53 and 55 are bent obliquely upward from the base 51 and then obliquely downward, and provided with contact portions 59 and 61 at their ends. The upwardly convex portions of the centers of the arm portions 53 and 55 are referred to as pressing portions 63 and 65.

FIG. 2 is a view showing a knob 70 as a rotating body . FIG. 2A is a sectional view taken along the line AA of FIG. 1, and FIG. 2B is a rear view.

As shown in FIG. 1 and FIG.
Is composed of a circular knob 71 and a ring 73 provided on the outer periphery of the knob 71 in a ring shape.
A circular concave portion 75 is provided on the lower surface of the knob portion 71, and a ring-shaped concave portion 77 is provided on the lower surface of the flange portion 73.

Further, as shown in FIG. 2B, in the recess 77, there are twelve sets of projections 79 and 81 serving as a pair of depressed portions. 30
゜). However, the projections 79, 81 of each set are arranged so that their phases are slightly shifted.

Next, as shown in FIG. 1, the cover 90 is formed of a substantially circular synthetic resin plate, and has a circular hole 91 in the center thereof.
And small projections 93 are provided on the lower surface of the mounting plate 10 at positions facing the through holes 23, respectively. The flange 73 of the knob 70 on the back surface of the cover 90
A portion for storing the like is a concave portion 95.

In order to assemble the rotary switch, first, the ring portion 31 of the switch board 30 is mounted on the board mounting surface 15 of the mounting plate 10. At this time, the mounting plate 10
Are inserted into the holes 47 provided in the ring portion 31.

Next, the base 51 of the contact plate 50 is mounted on the land pattern 35 of the switch substrate 30. At this time, the three small projections 21 penetrating the holes 47 of the switch board 30 are inserted into the three holes 57 of the base 51.

In this state, each small projection 2 of the mounting plate 10 is
The tip of 1 is heat caulked. Thereby, the switch board 3
0 and the contact plate 50 are integrally fixed to the mounting plate 10.

At this time, the two contact portions 59 and 61 of the contact plate 50 are located on the two contact patterns 37 and 39 of the switch board 30 at a predetermined distance.

Next, the knob 70 is placed on the switch substrate 30. At this time, the outer periphery of the collar portion 73 of the knob 70 is housed inside the outer projection 13 of the mounting plate 10.

Then, a cover 90 is put on the cover 90, the knob 71 of the knob 70 projects from the hole 91 of the cover 90, and the small projections 93 on the lower surface of the cover 90 are respectively inserted into the through holes 23 of the mounting plate 10. The tip of each small projection 93 is thermally caulked on the back side.

FIG. 3 is a schematic sectional side view showing the rotary switch assembled in this manner. As shown in the drawing, a switch board 30 is provided on the board mounting surface 15 of the mounting plate 10.
The ring portion 31 is placed, and a contact plate 50 is fixed on the ring portion 31, and a collar portion 73 of a knob 70 is further disposed thereon. A cover 90 is put on the collar 73.

The two arm portions 53 of the contact plate 50,
55 is located at a position where the projections 79 and 81 of the knob 70 abut.

Although other functional parts are accommodated in the space A at the center of the rotary switch, the description is omitted because it is not the gist of the present invention.

When the knob 70 is turned, the knob 7
The projections 79 and 81 of the zero contact the arm 53 and the arm 55 of the contact plate 50 with a slight phase difference, respectively.

FIG. 4 shows the arm 53 of the contact plate 50,
FIG. 5 is a schematic plan view showing a positional relationship between 55 and protrusions 79 and 81 of a knob 70. FIG. 5 shows the arm 5 of the contact plate 50.
FIG. 4 is an enlarged schematic side sectional view of a main part showing a positional relationship between 3, 55 and a protrusion 79, 81 of a knob 70.

When the knob 70 is rotated clockwise (in the direction of the arrow) as shown in FIG. 4, the projections 79 and 81 provided on the lower surface of the knob 70 also rotate clockwise, and the arms of the contact plate 50 are respectively rotated. It passes over the parts 53 and 55.

When the projection 79 passes over the arm 53, the tip of the projection 79 abuts against the pressing portion 63 of the arm 53 and pushes it down, whereby the tip of the arm 53 abuts. The portion 59 (see FIG. 5) is the switch substrate 3
The contact between the draw-out pattern 41 and the draw-out pattern 43 shown in FIG.

Similarly, when the other projection 81 passes over the arm portion 55, the tip of the projection 81 contacts the pressing portion 65 of the arm portion 55 and presses it down. 55 abutting portion 61 at tip (see FIG. 5)
Resiliently contacts the contact pattern 39 of the switch board 30, whereby the extraction pattern 41 and the extraction pattern 4 shown in FIG.
5 turns on.

Since the two projections 79 and 81 are slightly displaced in the circumferential direction of the knob 70 as described above, when the knob 70 is rotated, each of the projections 79 and 81 is shifted.
The position where 81 abuts on the pressing portions 63 and 65 of the arm portions 53 and 55 is slightly shifted.

More specifically, when the knob 70 is turned in the direction of the arrow shown in FIG.
The projection 81 of the arm portion 5 is provided earlier than the projection 79.
5 abuts against the pressing portion 65, and therefore the abutting portion 61 abuts.
The contact pattern 39 is turned on slightly before the portion 59. When the knob 70 is further rotated and the projections 79 and 81 pass over the pressing portions 63 and 65 of the arm portions 53 and 55, the arm portion 55 first returns to the original position and the contact portion 61
There off, and then return the arm portion 53 to the original position abutting
The part 59 turns off.

When the one knob 70 is turned in the opposite direction, the projection 79 comes into contact with the pressing portion 63 of the arm 53 before the projection 81, and therefore the contact portion 59 comes into contact with the contact portion 6.
The contact pattern 37 is turned on slightly earlier than 1. The timing of turning off the contact portion 59 is slightly earlier.

In other words, it is possible to detect whether the knob 70 is rotated clockwise or counterclockwise by the change in the switch pattern output caused by the phase difference.

As is apparent from the above embodiment, in the present invention, the contact portions 59 and 61 of the contact plate 50 and the contact patterns 37 and 39 do not make sliding contact with each other, but simply repeat elastic contact and separation between them. Just turn it on and off. Therefore, the contact portions 59 and 61 of the contact plate 50 and the contact patterns 37 and 3
9 has small wear, and its durability is improved.

The arm portions 53, 55 of the contact plate 50 do not always contact the projections 79, 81 of the knob 70, and are normally in a no-load state. The durability is improved. The contact plates 105, 107, and 109 of the conventional rotary switch as shown in FIG. 7 are always in elastic contact with the switch substrate 100, and therefore have lower durability than the present invention.

In the case of the present invention, since the switch board 30 and the contact plate 50 do not rotate, the ring portion 31 of the switch board 30 does not necessarily need to be formed in a ring shape. Therefore, for example, as shown in FIG. 6A, by making the drawing directions of the drawing patterns 41, 43, and 45 the same, the area of the entire switch board 30 'can be reduced.

Further, in the case of the present invention, it is not necessary to provide the common switch pattern 101 serving as a common and the contact plate 105 slidingly contacting the common switch pattern 101 unlike the conventional example shown in FIG. Can be achieved.

In order to prevent so-called sag of the arms 53, 55, for example, as shown in FIG. 6B, even if the length of the arms 53 ', 55' of the contact plate 50 'is increased. good.

The mounting direction of the contact plate 50 does not necessarily need to be set along the rotation direction of the knob 70 as in the above embodiment. For example, as shown in FIG.
The contact plate 50 ″ may be oriented in a direction different from the rotation direction of the knob 70.

In the above embodiment, the rotary switch according to the present invention is used as a pulse switch that generates an on / off pulse at predetermined rotation intervals when the knob is turned. However, the present invention is not limited to this. However, it is needless to say that, by variously changing the shape of the protrusion, the protrusion can be used as a rotary switch that generates another ON / OFF waveform.

In the above embodiment, the number of the arm portions 53 and 55 of the contact plate 50 is two, and each arm portion 5
Although there are two types of projections abutting on 3, 55, the projection 79 and the projection 81, the number of the arm portions may be one or three or more as necessary, and the type of the projection may be changed accordingly. Needless to say.

In the above embodiment, the knob 70 has the protrusion 7
Although 9, 81 are provided, the present invention may provide a projection on a rotating body other than the knob.

In the above embodiment, a switch substrate made of a flexible sheet is used as the switch substrate, but the present invention is not limited to this, and a switch substrate made of a hard plate may be used.

[0054]

As described in detail above, the rotary switch according to the present invention has the following excellent effects. The elastic plate (contact plate) and the contact forming member (switch
During switch contact of switch substrate) (contact pattern) is not sliding because they merely turned on and off repeatedly separated from the elastic contact, any wear between them is small, the durability is improved.

The elastic plate (contact plate) is a pressing part of the rotating body.
It is always (projection) does not abut, usually because in a state of no load, the durability of the elastic plate is improved.

The size of the switch substrate can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a rotary switch according to an embodiment of the present invention.

FIG. 2 is a diagram showing a knob 70, and FIG.
2A is a cross-sectional view taken along line AA, and FIG.

FIG. 3 is a schematic side sectional view showing the assembled rotary switch.

FIG. 4 is a view illustrating arm portions 53 and 55 of a contact plate 50 and a knob 70;
It is a schematic plan view which shows the positional relationship of projections 79 and 81 of FIG.

FIG. 5 is a diagram illustrating arm portions 53 and 55 of a contact plate 50 and a knob 70;
It is a principal part enlarged schematic side sectional view which shows the positional relationship of the projections 79 and 81 of FIG.

6 (a) and 6 (b) are diagrams showing another embodiment of the present invention.

FIG. 7 is a schematic plan view showing an example of a conventional rotary switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mounting plate 30 Switch board 35 Land pattern 37, 39 Contact pattern 41, 43, 45 Pull-out pattern 50 Contact plate 51 Base 53, 55 Arm 70 Knob (rotating body) 79, 81 Projection 90 Cover

Claims (2)

(57) [Claims] A contact forming member provided with a switch contact and a land contact; a base fixed directly to the land contact; and an abutting portion for directly contacting the switch contact formed on an arm protruding directly from the base. An elastic plate comprising: a rotating body provided with a press-down portion that presses down the elastic plate on a lower surface thereof; and a base of the elastic plate is directly contacted with the land contact to be fixed to the arm portion. The contact portion provided is positioned above the switch contact, and the rotating body is rotatably disposed above the elastic plate, and the pressing portion provided on the rotating body by rotating the rotating body is Check the a structure allowed to contact the contact portion to the switch contact by depressing the arm of the elastic plate, the rotating body for accommodating the other functional parts in the center of the rotary body
A circular knob that forms the gap and the outer periphery of the knob
A collar provided so as to protrude in a ring shape.
A press-down portion arranged in a ring shape is provided on the lower surface of the base portion, while the circuit board constituting the contact forming member is made of synthetic resin.
And the contact forming member and the base of the elastic plate.
The fixing is performed by attaching the mounting plate and the elastic
Between the bases of the conductive plates while sandwiching the contact forming member
Done by further inside the base fixing portion of the elastic plate of the mounting plate
Has a substantially ring-shaped inner protrusion, and is provided at the center of the rotating body.
By engaging the inner circumference of the space provided with the outer circumference of the inner projection
A rotary switch wherein the rotating body is rotatably supported . 2. A cover having a hole penetrating a knob of the rotating body is attached to the upper part of the rotating body so as to cover the upper part of the rotating body so as to cover the flange part of the rotating body. The rotary switch according to claim 1, wherein: