JPH0741944U - Switch device - Google Patents

Abstract

(57) [Summary] [Purpose] A wide detection area is secured and reliable on / off control is performed. [Arrangement] An alternating current generator 3, a coil 5 for generating a magnetic field over a certain region by an alternating current, and at least a change in impedance of the coil 5 that changes when a person enters the magnetic field 17 is detected, and a detection signal thereof is detected. Drive signal output control section 9 for turning on the guide device 7 and the like based on the above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch device that performs on / off control when a person or an object enters or leaves the magnetic field region.

[0002]

[Prior art]

 Conventionally known switch devices include, for example, a light detection type device that performs on / off control by blocking or unblocking light, or a switch device that turns on when a predetermined weight is activated or deactivated There is a weight detection type that performs off control.

[0003]

[Problems to be solved by the device]

 As described above, in both the light detection type and the weight detection type, the detection position is specified within a relatively narrow range, so that the usage conditions are restricted.

Therefore, an object of the present invention is to provide a switch device capable of obtaining a detection position over a wide range.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides an alternating current generator, a coil that generates a magnetic field over a certain region by an alternating current, and an impedance change of the coil that changes at least when a person enters the magnetic field. And a drive signal output control unit for detecting and turning on the guide device and the like based on the detection signal.

[0006]

[Action]

 According to such a switch device, a magnetic field is generated from the coil over a certain area. Therefore, for example, when a person enters this magnetic field, the impedance of the coil changes, and the change in impedance is detected by the drive signal output control unit, and based on the detection signal, the guide device etc. is turned on. To do. In this case, the magnetic field ensures a large detection area.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS.

Reference numeral 1 in the figure shows a switch device. The switch device 1 includes an AC current generator 3 and a coil 5 for generating a magnetic field over a certain region by an AC current, and at least a person entering the magnetic field. A drive signal output control unit 9 is provided for detecting a changing impedance of the coil 5 and for turning on the guide device 7 based on the detection signal.

As shown in FIG. 2, the alternating current generating unit 3 exchanges the trigger signal from the oscillating unit 11 with a cycle signal by the waveform shaping unit 13 and then amplifies it by the excitation amplifying unit 15 so that the coil 5 is kept constant. The AC current of is output.

The coil 5 is set on the road or in a building such as an exhibition hall or an event according to the purpose of use of the switch device 1, and an alternating current flows through the coil 5, so that the coil 5 is kept constant as shown in FIG. The magnetic field 17 is generated within the range of.

As shown in FIG. 2, the drive signal output control unit 9 causes the impedance exchanging unit 19 and the amplification unit 21 to pass through the magnetic field 17 and thereby perform a large amplitude modulation with a time lag, and this modulation is performed. The region is subjected to a rectifying action in the rectifying unit 23. As a result, a large pulsating flow region a-1 is secured in the modulation region a. This pulsating flow is output as 1 and 0 pulses by the smoothing unit 25 and the comparison unit 27, and this output pulse is input to the control unit 29.

The control unit 29 functions to turn on the guide device 7 by being in an operation state in which a trigger pulse and a drive signal are output as shown in FIG. 3 when a signal from the coil 5 is input.

The guide device 7 is composed of a voice recording section 31 in which information is recorded with a tape or the like, a power amplification section 33, and a speaker 35, which is turned on by a signal from the drive signal output control section 9 and is output as a voice. It has become so.

According to the switch device 1 having the above-described configuration, the AC current is generated by the AC current generator 5 from the coil 5 over a certain area by the AC current flowing through the coil 5. When a person enters the magnetic field 17, the impedance of the coil 5 changes, and the drive signal output control section 9 detects the impedance change and turns on the guide device 7 based on the detection signal. In this case, a wide detection area is created by the magnetic field 17, so that reliable detection can be performed without causing a detection error.

In this embodiment, the switch device for turning on / off the guide device 7 has been described, but the present invention is not limited to the guide device 7 and may be applied to other devices. Moreover, although the impedance change of the coil has been described by a person, the object is not limited to a person and may be any moving object.

[0016]

[Effect of device]

 As described above, according to the switch device of the present invention, the guide device and the like can be turned on when a person enters the magnetic field region. Moreover, a wide detection area can be obtained, and reliable on / off control is possible.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an entire switch device according to the present invention.

FIG. 2 is a block diagram of the entire switch device according to the present invention.

FIG. 3 is a time chart of each block.

[Explanation of symbols]

 3 AC current generator 5 Coil 7 Guide device 9 Drive signal output controller 17 Magnetic field

Claims (1)

[Scope of utility model registration request] 1. An alternating current generator, a coil that generates a magnetic field over a certain area by an alternating current, and at least a change in impedance of the coil that changes when a person enters the magnetic field is detected, and based on the detection signal. And a drive signal output control unit for turning on the guide device and the like.