JPS5924111Y2 - switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch, and in particular, it is an object of the present invention to provide a circuit amount changeover switch that reduces noise when switching.

Generally, in audio equipment such as tape recorders and car stereos, the circuit amount selection switch is changed for recording, playback, etc., but a switch (muting switch) that changes at the timing of this change is provided to reduce noise when switching. Hereinafter, an embodiment of the present invention shown in the drawings will be explained. 1 is a frame body, 2 is an insulating material, and an operating part protrudes outward from a hole 1a of the frame body 1. 2a and a movable contact piece storage recess 2b,
3 is an insulating substrate fixed to the lower part of the frame 1; 4...
・ is a fixed contact piece fixed to the insulating substrate 3; 5 is a common fixed contact piece fixed to the insulating substrate 3 in a state that straddles the fixed contact piece 4; The fixed contact pieces 4..., 5 are provided with a convex portion 5a located between the pieces 4, and in FIG. 1 are provided with two circuit amount changeover switches SW1.
It shows the status of.

SW2 is a muting switch, 6 is a fixed contact piece for the front 2 of the switch S fixed to the insulating substrate 3, and 7 is the muting switch fixed to the insulating substrate 3 in such a manner that it straddles the fixed contact piece 6. Common fixed contact piece for S front 2,
The convex portion 7a provided on the common fixed contact piece 7 is located at a position dimensionally corresponding to the fixed contact piece 4 of the circuit amount changeover switch SW1, and is also located at a position corresponding to the contact portion of the fixed contact piece 6. 6a is
Dimensionally, the contact portion 6a is located at a position corresponding to the convex portion 5a of the common fixed contact piece 5 of the circuit amount changeover switch SW1, and the widthwise dimension of the contact portion 6a is wider than the width of the convex portion 5a. .

8 is a movable contact piece having a bifurcated shape and having a long side contact portion 8a and a short side contact portion 8b. At this time, although the short side contact portion 8b of the movable contact piece 8 always slides on the common fixed contact pieces 5 and 7, the long side contact portion 8a
slides on the convex portion 5a of the fixed contact piece 4 and the common fixed contact piece 5 in the circuit amount changeover switch SW1, and slides on the convex portion 5a of the fixed contact piece 4 and the common fixed contact piece 5 in the muting switch SW2, and slides on the convex portion 5a of the common fixed contact piece 7, the convex portion 7a, and the fixed contact piece in the muting switch SW2. Next, the switching states of the circuit amount changeover switch SW1 and the muting switch SW2 will be explained with reference to FIGS. 2 and 3. Normally, the inter-circuit changeover switch SW1 is The long side contact portion 8a of the contact piece 8 is in contact with one fixed contact piece 4 and one circuit is selected, and the muting switch SW2 is in a state where the long side contact portion 8a of the movable contact piece 8 is in contact with the one fixed contact piece 4. 8a and 8b are on the common fixed contact piece 7 and are in an open state.

In this state, when the slider 2 is moved to move the movable contact piece 8, the long side contact portion 8a of the movable contact piece 8 of the muting switch SW2 comes into contact with the contact portion 6a of the fixed contact piece 6, and the muting switch SW2 is moved. Close the switching switch SW2,
Furthermore, if you continue to move, muting switch SW2
While maintaining the closed state, press the circuit amount changeover switch SW1.
The long side contact portion 8a of the movable contact piece 8 extends from the fixed contact piece 4 to the convex portion 5a of the common fixed contact piece 5, and from the convex portion 5a to the next fixed contact piece 4.
When the long side contact portion 8a of the movable contact piece 8 of the muting switch SW2 contacts the convex portion 7a of the common fixed contact piece 7 and becomes open, the circuit amount changeover switch SW1 is switched to the next circuit.

In other words, before switching the circuit, muting switch SW
2, and in this state, turn on the circuit amount changeover switch SW1.
After that, muting switch S
W2 is opened, and the circuit based on the circuit amount changeover switch SW1 comes into operation.

In this way, a similar switching operation is performed every time the circuits are switched.

That is, according to the present invention, the muting switch is short-circuited before one circuit is switched, and then the muting switch is opened after one circuit is switched to another circuit. , the noise at the time of circuit switching can be reduced, and the common fixed contacts of the circuit amount changeover switch SW1 and the muting switch SW2 are both
Since it is installed so as to straddle the fixed contact piece, the space factor is good and it is compact, and both switches SW1. Since the SW2 has a contact configuration in which the convex portion of the common fixed contact piece is located between the fixed contact pieces, it has the advantage that the movable contact piece can be shared by both switches.

[Brief explanation of drawings]

Both show the switch of the present invention, and Figure 1 is an exploded perspective view;
Figure 2A9 is an enlarged plan view of the circuit amount changeover switch and muting switch, and Figure 3A9 is a sectional view of the main part in Figure 2. SWl...Circuit amount selection switch, SW2...
... Muting switch, 1 ... Frame,
1a...hole, 2...slider, 2a
......Operation section, 2b...Concavity, 3...
...Insulating board, 4...Fixed contact piece, 5...
・・Common fixed contact piece, 5a・・・・Protrusion, 6・・・・
...Fixed contact piece, 6a...Contact part, 7...
・Common fixed contact piece, 7a...Protrusion, 8...
・Movable contact piece, 8a... Long side contact part, 8b...
...Short side contact part.

Claims (1)

[Scope of utility model registration request] A circuit amount changeover switch with one common fixed contact and multiple fixed contacts, and a mu with one common fixed contact and one fixed contact with protruding contact parts. a muting switch, a convex portion is provided on the common fixed contact of each of the switches, the common fixed contact piece is arranged so as to straddle the fixed contact piece, and each of the contact parts of the fixed contact piece of the muting switch is provided with a convex portion. are provided at positions corresponding to each of the convex portions of the common fixed contact piece of the circuit amount changeover switch, and the widthwise dimension of the contact portion is wider than the width of the convex portion of the common fixed contact piece of the circuit amount changeover switch. The long side contact part of the movable contact piece, which has a short side contact part and a long side contact part, is made to slide on the convex part of the common fixed contact piece and the fixed contact piece. Features a switch.