JPH09259700A - Rotary switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary switch with improved durability and of which ON/OFF operation can be reliable carried out. SOLUTION: This rotary switch comprises a switch substrate 30, an elastic pressing plate 50, and a rotary body 70; and in the switch substrate 30, switch contacts 39, 39 are formed, and the elastic pressing plate 50 is made of an elastic body and comprises a base part 51 to be installed on the switch substrate 30 and arm parts 53, 55 having pressing parts 59, 61 formed at prescribed positions by bending upward from the base part 51 and positioned above the switch contacts 39, and the rotary body 70 is so installed on the switch substrate 30 in a freely rotatable way and comprises touching parts 79, 81 in the down face to be brought into contact with the arm parts 53, 55 and to push down the arm parts 53, 55. The touching parts 79, 81 are brought into contact with the arm parts 53, 55 by rotating the rotary body 70 and push the arm parts 53, 55 and the pressing parts 59, 61 push down the switch contacts 39, 39 and the switch is thus turned on.

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, by rotating a rotary member having a slider made of a metal plate fixed, the slider is brought into sliding contact with a switch pattern provided on another member. , Which has a structure for turning the switch on and off,
On the other hand, there is a structure in which a rotary body provided with a desired switch pattern is rotated to bring the switch pattern surface into sliding contact with a slider fixed to another member, thereby turning on / off the switch. .

[0003]

However, the above-mentioned conventional rotary switch has the following problems. In any of the rotary switches described above, since the slider is in sliding contact with the switch pattern, the slider and the switch pattern are greatly worn, which hinders improvement in durability.

Since the slider is always in elastic contact with the surface on which the switch pattern is formed, the elastic contact force of the slider causes a so-called fatigue, and the elastic contact force becomes weaker with time. Was hindering the improvement of.

Since the structure is such that the slider is brought into direct sliding contact with the switch pattern, it is necessary to expose the switch pattern. For this reason, foreign matter such as dust or grease adheres to the switch pattern, so that the switch is properly turned on and off. There is a risk that you will not be able to do it.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a rotary switch which has improved durability and can be reliably turned on and off.

[0007]

In order to solve the above problems, the present invention comprises a switch board provided with a switch contact and an elastic body, and a pressing portion provided at a predetermined position on the switch contact of the switch board. An elastic pressing plate having an arm portion located on the switch substrate, and a contacting portion rotatably disposed on the switch substrate and contacting the arm portion of the elastic pressing plate to push down the arm portion on the lower surface thereof. And a contact portion provided on the rotating body contacts an arm portion of an elastic pressing plate to push down the arm portion, and the pressing portion of the arm portion is the switch substrate. The switch contact is pressed.

[0008]

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.
The switch substrate 30 and the elastic pressing plate 50 are fixed on the mounting plate 10, a knob (rotating body) 70 is placed on the switch substrate 30, and a cover 90 is mounted on the knob. Hereinafter, each component will be described.

The mounting plate 10 is a molded resin plate,
On the surface thereof, arc-shaped inner and outer projections 11 and 13 are provided concentrically, and a switch board mounting surface 15 is formed between the inner and outer projections 11 and 13.

Further, the inner protrusion 11 and the outer protrusion 13 are provided with notches 17 and 19 for leading out a lead-out portion 47 of the switch substrate 30 described below, respectively. Further, five small protrusions 21 are provided in the switch board mounting surface 15.

A large number of through holes 23 are provided on the outer surface of the outer protrusion 13 so as to surround the outer protrusion 13.

Next, FIG. 2 is an exploded perspective view of the switch substrate 30. As shown in FIG. 1 and FIG. 1, this switch substrate 3
Reference numeral 0 is a so-called membrane switch, which includes a substrate body 31 formed in a ring shape and a lead-out portion 47 drawn out in a strip shape from one end of the substrate body 31.

Here, the substrate body 31 is constructed by stacking a first substrate 33, a spacer 35, and a second substrate 37.

The first substrate 33 is formed integrally with the drawer portion 47, and has two switch patterns 33b and 33b and a land pattern 33 on the upper surface of the ring-shaped film 33a.
c and a lead-out pattern 33d drawn out from each pattern 33b, 33c are formed by printing.

In addition, two places in the land pattern 33c,
Through holes 33e are formed at three other locations.

The spacer 35 is a ring-shaped film 35a.
And the two switch patterns 33
Through holes 35b, 35c and 35e are formed at positions facing b and 33b, at positions facing the land pattern 33c and at positions facing the through hole 33e, respectively.

The second substrate 37 is a ring-shaped film 37.
The two switch patterns 33b, 33b on the lower surface of a
Switch patterns 37b and 3 at positions facing each other.
7b, and a land pattern 37c is formed at a position facing the land pattern 33c.
The through holes 37 are provided at the positions facing the two through holes 33e, respectively.
e is provided.

Two switch patterns 37b, 37
The circuit pattern 37d connects between b and the land pattern 37c.

The switch substrate 30 is assembled by stacking the spacer 35 and the second substrate 37 on the first substrate 33. At this time, the switch patterns 33b and 37b face each other to form two sets of switch contacts 39 and 39 (see FIG. 1).

Returning to FIG. 1, the elastic pressing plate 50 is composed of an elastic metal plate, and is composed of a flat plate-shaped base portion 51 and two arm portions 53 and 55 protruding from one end of the base portion 51. . The base 51 is provided with two through holes 57.

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

Next, FIG. 3 is a view showing the knob 70. FIG. 3 (a) is a sectional view taken along the line A--A of FIG. 1, and FIG.

As shown in FIGS. 1 and 3, the knob 70 is composed of a circular knob portion 71 and a collar portion 73 provided on the outer circumference of the knob portion 71 in a ring shape. A circular recess 75 is provided on the lower surface of the knob portion 71, and a ring-shaped recess 77 is provided on the lower surface of the collar portion 73.

Further, in the recess 77, as shown in FIG. 3 (b), twelve twelve circumferential projections of abutting portions 79 and 81 are provided.

Next, as shown in FIG. 1, the cover 90 is composed of a substantially circular mold resin plate, and a circular hole 9 is formed in the center thereof.
1 and the through hole 23 of the mounting plate 10 on the lower surface thereof
The small protrusions 93 are provided at positions facing each other. The collar portion 7 of the knob 70 on the back surface of the cover 90
A portion for accommodating 3, etc. is a recess 95.

To assemble this rotary switch, first, the substrate body 31 of the switch substrate 30 is placed on the substrate mounting surface 15 of the mounting plate 10. At this time, the mounting plate 10
The small protrusions 21 provided on the substrate 21 penetrate through the through holes 33e, 35e, 37e (see FIG. 2) provided in the substrate body 31.

Next, the base 51 of the elastic pressing plate 50 is placed on the portions of the switch board 30 where the land patterns 33c and 37c (see FIG. 2) are provided, and the switch board 30 is penetrated through the through holes 57 of the base 51. Insert the two small protrusions 21.

When the tips of all the small protrusions 21 are heat-crimped, the switch board 30 and the elastic pressing plate 50 are attached to the mounting plate 1.
Fixed to 0. At this time, the small protrusion 21 is provided between the land patterns 33c and 37c facing each other through the through hole 35c (see FIG. 2) provided in the spacer 35 of the switch substrate 30.
It is pressure-welded by the pressing force at the time of heat caulking.

At this time, the two pressing portions 59 and 61 of the elastic pressing plate 50 are located on the two switch contacts 39 and 39 of the switch substrate 30 with a predetermined distance therebetween.

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

Then, the cover 90 is put on the cover 90, the knob portion 71 is projected from the hole 91 of the cover 90, and the small projections 93 on the lower surface of the cover 90 are inserted into the through holes 23 of the mounting plate 10, respectively. The tip of each small protrusion 93 is heat-crimped on the back surface side.

FIG. 4 is a schematic side sectional view showing the assembled rotary switch. As shown in the figure, an elastic pressing plate 50 is fixed on the switch substrate 30, and a collar portion 73 is located on the elastic pressing plate 50. In addition, 2 of the elastic pressing plate 50
The arm portions 53, 55 of the book are abutting portions 79, 79 of the knob 70.
It is located at a position where 81 abuts.

Other functional parts are accommodated in the space C at the center of the rotary switch, but the description thereof is omitted because it is not the gist of the present invention.

When the knob 70 is rotated, the knob 7
0 contact portions 79 and 81 are two arm portions 53,
Abut 55.

Here, FIG. 5 and FIG. 6 respectively show the elastic pressing plate 5.
0 arm portions 53, 55 and the contact portions 79, 8 of the knob 70
1 is a schematic plan view showing the positional relationship of No. 1 and an enlarged side sectional view of a main part.

Then, as shown in FIG. 5, when the knob 70 is rotated in the direction of the arrow, the contact portion 7 provided on the lower surface of the knob 70 is rotated.
9, 81 pass over the arm portions 53, 55, respectively.

As shown in FIG. 6, when the contact portion 81 passes over the arm portion 55, the tip of the contact portion 81 abuts against the convex portion 65 of the arm portion 55 and pushes it down, whereby the arm portion 55. The pressing portion 61 at the tip is the switch substrate 30.
The switch contact 39 is pressed, and the switch patterns 33b and 37b facing each other are brought into contact with each other to be turned on.

Similarly, the other contact portion 79 is the arm portion 5.
3 also passes over the pressing portion 5 at the tip of the arm portion 53.
9 presses the switch contact 39 and both switch patterns 3
Turn on between 3b and 37b.

In this embodiment, the contact portion 7
Since 9 and 81 are provided at equal intervals, the output on / off pulses are at regular intervals. Further, in this embodiment, the positions where the two contact portions 79 and 81 contact the convex portions 63 and 65 are slightly shifted,
A predetermined phase difference occurs between the output on / off patterns of both.
That is, the rotary switch according to this embodiment is used to detect whether the knob 70 is rotated clockwise or counterclockwise by using the phase difference.

As is apparent from the above embodiment, in the present invention, the pressing portions 59, 6 of the elastic pressing plate 50 are used.
No. 1 does not make sliding contact, but simply presses the switch contacts 39, 39, and the two switch patterns 33b, 37b forming the switch contact 39 simply make contact / non-contact state repeatedly and make sliding contact. Never. Therefore, the pressing portions 59 and 61 of the elastic pressing plate 50 and the switch contact 3
The wear of both 9 and 39 is small, and the durability is improved.

The switch contact 39 according to the present invention is
The switch patterns 33b and 37 are provided inside the two films.
b has a built-in structure, foreign matter such as dust and grease, which easily adheres to the switch substrate 30, does not adhere to the switch pattern 33.
There is no adhesion on b and 37b, and the on / off operation of the switch can always be performed normally.

Further, the arm portions 53, 55 of the elastic pressing plate 50
Since the contact portions 79, 81 of the knob 70 are not always in contact with each other, and thus are normally in a non-loaded state, the durability of the arm portions 53, 55 is improved.

In the case of the present invention, since neither the switch substrate 30 nor the elastic pressing plate 50 rotates, the substrate body 31 of the switch substrate 30 does not necessarily have to be formed in a ring shape. For example, as shown in FIG. As shown, the switch substrate 30-2 can be formed only by the switch contacts 39-2 and 39-2 and the portion to which the elastic pressing plate (not shown) is attached, and the size can be reduced.

In order to prevent so-called settling of the arm portions 53, 55, the length of the arm portions 53-3, 55-3 of the elastic pressing plate 50-3 is set as shown in FIG. 7B, for example. You can make it longer. Also, the installation direction of the elastic pressing plate 50-4 does not need to be attached along the rotation direction of the knob 70 as in the above-described embodiment, and is different from the rotation direction of the knob 70 as shown in FIG. 7B, for example. You may turn to face.

The switch contact for the switch substrate applied to the present invention is not limited to the switch contact 39 having the above-mentioned structure, and switch contacts of various other structures can be used. For example, a pressure-sensitive type as shown in FIG. Switch contacts may be used.

That is, FIG. 8A is a plan view of one pressure-sensitive switch contact, and FIG. 8B is a sectional view taken along line BB of FIG. 8A.

As shown in the figure, the pressure-sensitive switch contact 100 has two switch patterns 1 on a substrate 110.
11, 111 are formed, and both switch patterns 111,
The pressure sensitive resistance film 113 is formed so as to cover the upper surface of the pressure sensitive resistance film 111, and both switch patterns 111, 1 on the pressure sensitive resistance film 113 are formed.
One conductive pattern 115 is formed at a position opposed to 11.

The pressure-sensitive resistance film 113 has a function of reducing the resistance value in the thickness direction by pressing in the thickness direction. Therefore, the two switch patterns 111, 111 of the conductive pattern 115 are formed by an elastic pressing plate (not shown). 111
If the portion directly above is pressed at the same time, only the resistance value in the thickness direction of the pressed portion of the pressure-sensitive resistance film 113 becomes smaller,
Both switch patterns 11 through the conductive pattern 115
The resistance value between terminals 1 and 111 decreases and the device turns on. The pressure-sensitive switch has various other structures, and the present invention can be applied to any of them.

In the above embodiment, the rotary switch is constructed as a pulse switch that generates an on / off pulse at predetermined intervals when the knob is rotated.
It goes without saying that by changing the shape of 81 variously, a rotary switch that produces other on-off waveforms can be configured.

It goes without saying that the number of arms 53 and 55, the number of elastic pressing plates 50 themselves, the number and shape of the contact portions 79 and 81 can be changed.

Further, in the above embodiment, the knob 70 is provided with the abutting portions 79 and 81, but the abutting portion may be provided on the rotating body other than the knob.

Further, in the above embodiment, the spacer 35 is interposed between the first substrate 33 and the second substrate 37 in order to form the membrane switch. However, instead of interposing the spacer 35, the insulating paint is applied to the first substrate 33 and the second substrate 37. , Second substrates 33, 3
A membrane switch may be constructed by providing a gap between the seven.

The base 51 of the elastic pressing plate 50 does not necessarily have to be mounted on the switch substrate 30, but may be mounted on another member.

[0054]

As described in detail above, the present invention has the following excellent effects. Since the elastic pressing plate and the switch contact are not slidably contacted but simply pressed and separated to be repeatedly turned on and off, wear between both is small, and durability is improved.

Since the arm portion of the elastic pressing plate is not always in contact with the contact portion of the rotating body and is normally in an unloaded state, the durability of the arm portion is improved.

Since the elastic pressing plate merely presses the switch contact, it is not necessary to directly contact the switch pattern of the switch contact, and therefore the switch pattern need not be exposed. There is no risk of foreign matter such as dust or grease adhering to the switch pattern, and the switch is always turned on and off normally to improve its reliability.

[Brief description of drawings]

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

FIG. 2 is an exploded perspective view of a switch board 30.

FIG. 3 is a view showing a knob 70, and FIG.
Is a cross-sectional view taken along the line A-A of FIG.

FIG. 4 is a schematic side sectional view showing the assembled rotary switch.

5 is a schematic plan view showing the positional relationship between the arm portions 53 and 55 of the elastic pressing plate 50 and the contact portions 79 and 81 of the knob 70. FIG.

FIG. 6 is an enlarged side sectional view of an essential part showing the positional relationship between the arm portions 53 and 55 of the elastic pressing plate 50 and the contact portions 79 and 81 of the knob 70.

7 (a) and 7 (b) are diagrams showing another embodiment of the present invention.

8 (a) is a plan view of another switch contact of the present invention, and FIG. 8 (b) is a sectional view taken along line BB of FIG. 8 (a).

[Explanation of symbols]

 30 switch board 39, 39 switch contact 50 elastic pressing plate 51 base 53, 55 arm 59, 61 pressing 70 knob (rotating body) 79, 81 contact

Claims (1)

[Claims] 1. A switch board provided with a switch contact, an elastic press plate made of an elastic body, and having a pressing portion provided at a predetermined position thereof with an arm portion located on the switch contact of the switch board, and the switch board. A rotating body that is rotatably disposed on the lower surface of the elastic pressing plate and that has an abutting portion that abuts against the arm portion of the elastic pressing plate and pushes down the arm portion. A rotary switch, wherein an abutting portion provided on the rotating body abuts an arm portion of an elastic pressing plate to push down the arm portion, and the pressing portion of the arm portion presses a switch contact of the switch substrate.