JPS5818179Y2 - automatic opening/closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic opening/closing device capable of detecting ambient brightness and temperature and the approach of an object, and automatically opening and closing a load path under a desired combination of these two conditions.

Conventionally, an automatic flasher, which is a type of automatic switching device, has basically adopted a circuit configuration as shown in FIG. 1 or 2.

The flasher shown in Figure 1 uses a photoconductive element 1 when the surrounding area becomes bright.
The resistance value of the relay 2 decreases, current flows through the excitation coil of the relay 2, and the contacts close, cutting off the current to the load 3 such as a lighting lamp.

On the other hand, when the surroundings become dark, the resistance value of the photoconductive element 1 increases, the contacts of the relay 2 close, and current is supplied to the load 3.

The flasher shown in the second diagram uses a photoconductive element 4 when the surrounding area becomes bright.
The resistance value decreases, the bimetal heating resistor 5 generates heat,
Bimetal 6 receives this heat and opens, cutting off the current to load 7.

On the other hand, when the surroundings become dark, the current to the resistor 5 is stopped, the bimetal 6 is closed, and current is supplied to the load 1.

All types of flashers operate reliably depending on the brightness of the surrounding area, but if such flashers are used for street lights, for example, the surrounding area will be dark (even if there are no people passing by) at night. The fatal drawback is that the lights are always on, which increases unnecessary power consumption and wastes energy.

The present invention was developed in view of the conventional situation described above, and is not limited to automatic flashers; it simultaneously detects ambient brightness and the approach of a hot object such as a person or vehicle, and can meet these two conditions as desired. It is an object of the present invention to provide an automatic opening/closing device which eliminates unnecessary closed states or unnecessary open states as much as possible by combining the above relationships.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings, taking an automatic flasher as an example.

In FIG. 3, 10 is a temperature object detector, 11 is an amplifier circuit, 12 is a drive circuit, and 13 is a load such as an illumination lamp.

The temperature object detector 10 focuses on the fact that temperature objects such as humans and vehicles always emit infrared rays, albeit in a small amount, and detects the approaching state of the temperature object by replacing it with the presence or absence of infrared rays. Uses an infrared detector.

The detector 10 includes an infrared detection element 14, a field effect transistor 15, and a resistor.

As the detection element 14, a pyroelectric effect element such as PZT or barium titanate porcelain is used.

When a temperature object approaches the flasher including the detection element 14, the detection element 14 is irradiated with infrared rays from the temperature object to generate an electrical signal, which is transmitted to the transistor 15.
is sent to the subsequent circuit via.

Transistor 15 is for lowering the output impedance of detector 10.

Bias power is applied to transistor 15 via a resistor.

The amplifier circuit 11 includes an operational amplifier 16, a highly conductive element 11 that defines the gain G of the circuit 11, and a resistor 18.

The amplifier circuit 11 is for amplifying the very small signals from the detector 10.

The gain G is given by G=1+Rp/R, where the resistance value of the photoconductive element 17 is R2 and the resistance value of the resistor 18 is R1.

The resistance value of the photoconductive element 17 changes in proportion to the magnitude of light incident thereon, and for example, the resistance value decreases as the amount of light increases.

Therefore, when the surrounding area becomes bright during the daytime and the amount of light increases, the resistance value R2 of the element 17 decreases and the gain G of the circuit 11 decreases.

On the other hand, when the surroundings become dark, such as at night, the gain G of the circuit 11 increases.

Therefore, when the surroundings are bright during the daytime, even if a human body approaches and the output of the detector 10 is reduced, the amplifier circuit 1
Since the gain G of 1 is small, a sufficient output signal is not generated at the output terminal of the amplifier circuit 11.

On the other hand, when the surroundings are dark such as at night, when a human body approaches, the signal from the detector 10 is amplified by the amplifier circuit 11 and is sent to the output terminal. No signal is generated at the output terminal of the amplifier circuit 11.

That is, a signal is applied to the output terminal of the amplifier circuit 11 only when the surroundings are dark and a human body or the like approaches.

The output signal from the amplifier circuit 11 is applied to the drive circuit 12, current flows through the excitation coil of the relay 19, the contacts are closed, and the lighting lamp 13 is turned on.

If an alarm or the like is used as the load 13 instead of a lighting lamp, the drive circuit 12 may be changed accordingly.

Furthermore, if it is desired to amplify the signal from the detector 10 in the amplifier circuit 11 and extract the output in bright surroundings, the photoconductive element 17 may be inserted at the position of the resistor 18.

As explained above, the present invention enables simultaneous detection of ambient brightness and the approach of a temperature object such as a human body, eliminating unnecessary closed or open states.
Wasted power consumption in the load is reduced, making it possible to save energy.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams showing a conventional automatic opening/closing device, and FIG. 3 is a circuit diagram showing an embodiment of the automatic opening/closing device according to the present invention. 10...Temperature object detector, 11...Amplification circuit, 12...Drive circuit, 13...
Load, 17...Photoconductive element.

Claims (1)

[Scope of utility model registration request] An automatic opening/closing device that opens and closes a load path by detecting ambient brightness and the approach of a temperature object, wherein the element for detecting the temperature object is composed of a pyroelectric effect element, and the device detects the ambient brightness and the approach of a temperature object. An automatic opening/closing device characterized in that a detecting element is configured to have an impedance that defines a gain of an amplifier circuit that amplifies a detection signal of the pyroelectric effect element.