JPH0590754U - Automotive switch device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a switch device for an automobile, which can eliminate both the drawbacks of a push switch and the disadvantages of a touch switch to ensure control of a control load. To do. [Structure] The switch device for automobiles includes a conductive plate 1
6, a push switch 10, detection circuits 18, 21, 19 for detecting both the push operation of the push switch 10 and the touch operation on the conductive plate 16, and the control load 25 is turned on based on the detection result of the detection circuit. The control circuit 22 and 24 for off control.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an improvement of an automobile switch device for on / off controlling a control load such as an automobile room lamp.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 3, a mechanical push switch 1 of a push-on / push-off type is known. In this conventional push switch 1, when the head portion 2 is pressed in the direction of the arrow, a fixed contact (not shown) provided inside the housing 3 and a movable contact are brought into contact with each other, for example, as a control load such as an automobile. When the room lamp is turned on (lighted) and the head 2 is pressed again in the direction of the arrow in this state, the fixed contact and the movable contact are separated, and the vehicle room lamp is turned off (lighted). It

[0003]

[Problems to be solved by the device]

 However, in the conventional push switch 1, since the pressing stroke is long, the push switch 1 does not change the state only by lightly touching the push switch 1, so that it is difficult to reliably control the control load. is there. There is also a problem in that the head 2 is extremely protruding and thus does not look good.

[0006] Therefore, it is conceivable to perform on / off control of the control load by lightly touching the conductive plate by using a touch switch, but the touch switch is operated by wearing gloves or the like. However, in this case as well, it is difficult to reliably control the control load.

The present invention has been made in view of the above circumstances, and an object of the present invention is to eliminate both of the drawbacks of the push switch and the touch switch to ensure the control of the control load. Another object of the present invention is to provide a switch device for automobiles that can be realized.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a vehicle switch device according to the present invention includes a push switch having a conductive plate and a detection device that detects both a push operation of the push switch and a touch operation on the conductive plate. It is characterized by comprising a circuit and a control circuit for performing on / off control of a control load based on the detection result of the detection circuit.

[0007]

[Action]

 According to the vehicle switch device of the present invention, when the push switch is pushed or the conductive plate of the push switch is touched, the detection circuit detects the operation. The control circuit performs on / off control of the control load based on the detection result of the detection circuit.

[0008]

【Example】

 In FIG. 1, 10 is a push switch. The push switch 10 has a housing 11 and a movable pillar portion 12. The housing 11 is attached to the circuit board 13. A fixed contact 14 and a movable contact 15 shown in FIG. 2 are provided inside the housing 11. A thin conductive plate 16 is provided on the head of the movable column 12.

The fixed contact 14 and the movable contact 15 are brought into contact with each other by pressing the movable column 12 in the direction of the arrow. Here, the push switch 10 is of a type in which the movable pillar portion 12 self-returns in the direction opposite to the arrow direction when the pressing operation of the movable pillar portion 12 is released. The circuit board 13 is provided with the fixed contacts 14 and various electric parts described later.

As shown in FIG. 2, the conductive plate 16 is connected to a voltage source Vcc via a pull-up resistor 17 and is connected to one input terminal of an OR gate 19 via a buffer amplifier 18 functioning as an inverter element. It is connected. One of the fixed contacts 14 is connected to the voltage source Vcc via the pull-up resistor 20, and is also connected to the other input terminal of the OR gate 19 via the buffer amplifier 21 functioning as an inverter element. The other of the fixed contacts 14 is grounded.

When the conductive plate 16 is lightly touched by the hand, the input potential to the buffer amplifier 18 changes from high to low due to the impedance change. When the input potential of the buffer amplifier 18 changes from high to low, its output potential changes from low to high. When the movable contact 15 and the fixed contact 14 are brought into contact with each other by pressing the conductive plate 16, the input potential of the buffer amplifier 21 changes from high to low. When the input potential of the buffer amplifier 21 changes from high to low, its output potential changes from low to high. Therefore, the OR gate 19, the buffer amplifiers 18 and 21, and the pull-up resistors 17 and 20 function as a detection circuit that detects both the push operation of the push switch 10 and the touch operation on the conductive plate 16.

The output terminal of the OR gate 19 is connected to the T terminal of the T-type flip-flop 22. The output potential of the output terminal of the OR gate 19 becomes high when at least one of the input potentials to the two input terminals becomes high. In the T-type flip-flop 22, when the input potential to its T terminal becomes high, the output level of its Q terminal is inverted. That is, when the output level of the Q terminal is high and the input potential to the T terminal changes from low to high, the output level of the Q terminal changes from high to low. When the output level of the Q terminal is low and the input potential to the T terminal changes from low to high, the output level of the Q terminal changes from low to high.

The Q terminal of the T-type flip-flop 22 is connected to the base terminal of the transistor 24 via the current control resistor 23. The collector terminal of the transistor 24 is connected to a voltage source Vcc via an automobile room lamp 25 as a control load. The emitter terminal of the transistor 24 is grounded. When the output level of the Q terminal of the T-type flip-flop 22 becomes high, the transistor 24 is turned on, the collector-emitter is short-circuited, and a current flows through the automobile room lamp 25, which causes the automobile room lamp 25 to Light. If the push switch 10 is pushed again or the conductive plate 16 of the push switch 10 is touched while the room lamp 25 for automobile is lit, the output level of the Q terminal of the T-type flip-flop 22 is reversed. , The car room lamp 25 goes out.

Therefore, the T-type flip-flop 22, the current control resistor 23, and the transistor 24 function as a control circuit that performs on / off control of the control load based on the detection result of the detection circuit.

According to the present invention, the control load can be turned on / off by simply touching the conductive plate 16 of the push switch 10 with a hand, and the hands can be lightly conductive by wearing gloves or the like. Even if the control load cannot be controlled to be turned on / off simply by touching the conductive plate 16, the control load can be surely controlled to be turned on / off by pressing the conductive plate 16.

[0016]

【effect】

 Since the vehicle switch device according to the present invention is configured as described above, it is possible to eliminate both the drawbacks of the push switch and the touch switch and to ensure the control of the control load. Produce an effect.

[Brief description of drawings]

FIG. 1 is an external view of an automobile switch device according to the present invention.

FIG. 2 is a circuit diagram of an automobile switch device according to the present invention.

FIG. 3 is an external view of a conventional push switch.

[Explanation of symbols]

 10 ... Push switch 16 ... Conductive plate 19 ... OR gate 22 ... T-type flip-flop 24 ... Transistor 25 ... Automotive room lamp (control load)

Claims (1)

[Scope of utility model registration request] 1. A push switch having a conductive plate, a detection circuit for detecting both a push operation of the push switch and a touch operation on the conductive plate, and a control load based on a detection result of the detection circuit. A switch device for an automobile, comprising: a control circuit for on / off control.