JPH0681977A - Object detection operation device - Google Patents

Abstract

(57) [Abstract] [Object] The present device is provided with a circuit 1 for generating a pulse signal S1 having a cycle-width ratio of 500 or more, and a circuit 2 for generating a signal S2 in which a plurality of pulses are superimposed on the latter half of S1. , A light emitting element 3 that emits light in S2, a light receiving element 4 that receives reflected light from the detected object of the light emission, an amplifier circuit 5 that amplifies its output S3, and an actuator 6 that operates by the output S4 of the circuit 5.
The circuit 2 and the circuit 5 are powered by the signal S1.
ON / OFF is controlled by the presence or absence of. The present application reduces the power consumption of the device and reduces malfunctions. That is, the purpose is to endure long-term use even with a dry battery. [Structure] In circuit 1, a plurality of pulse signals S1a having a narrower width than signal S1 and in circuit 2 a plurality of pulse signals S1a are provided.
Signal S2 in which a single pulse of signal S2 is superimposed instead of 2
a is generated respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object detecting operation device, and more particularly, to an object detecting operation for detecting that an object to be detected is located at a predetermined position, for example, an object detecting operation used for an automatic faucet valve or the like. The present invention relates to power saving of the device.

[0002]

2. Description of the Related Art The inventors of the present invention have previously disclosed an object detecting operation device which stably detects that an object is located at a predetermined position and consumes less power, as disclosed in Japanese Patent Application No. 62-263924.
It was proposed in the publication. The outline will be described with reference to FIGS. FIG. 1 is an apparatus configuration, and FIG. 3 is an explanatory diagram of signal waveforms of respective parts.

The search interval circuit 1 has a predetermined period t.
A pulse signal S1 having a predetermined pulse width t1 to t4 and t5 to t8 is output from 1 to t5. In the amplification and modulation circuit 2, a pulse signal S1 is formed from the pulse signal S1 through the signal S1 ₀ , and the pulse signal S2 is input to the light emitting element 3. That is, the signal S2 is formed by a plurality of pulse signals that are inserted in the latter half of the signal S1 and have a narrower pulse width than the signal S1. The light emitting element 3 emits light according to the signal S2, the light emitting signal reflected from the detected object is received by the light receiving element 4, and the output signal S3 thereof is input to the amplifier circuit 5. Receiving amplifier circuit 5 is a signal to the coil of the actuator 6 via the signal S3 ₀ from the signal S3 S4
The delivery actuator 6 is operated.

In this case, since it is a waste of energy to constantly operate the amplification modulation circuit 2 and the light reception amplification circuit 5, the amplification modulation circuit 2 and the amplification circuit 5 are used by using the control circuit 7.
Is configured to be controlled depending on the presence or absence of the signal S1. Reference numeral 8 is a power source. Japanese Patent Application Sho 6
In No. 2-263924, in order to reduce the power consumption of the device, the ratio of the period (time) t1 to t5 of the signal S1 and the pulse width (time) t1 to t4 is configured to be 500 or more. The signal S2 is formed in the latter half of the signal S1 in order to avoid the first half in which the operation of the circuits immediately after the power supplies of the amplification and modulation circuit 2 and the light receiving and amplification circuit 5 are turned on is unstable. The amplifier based on the semiconductor device used in the development process of the present invention has a power supply of 0.5 ms width and a power supply of 0.5.
The amplification function could be stabilized in 3 ms.

[0005]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
It is an object of the present invention to provide an object detection operation device that can further reduce power consumption as compared with Japanese Patent Publication No. 263924 and can endure long-time use even with a dry battery power source.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a more energy-saving object detection operating device than the prior art, in which a pulse of a predetermined width is generated at a predetermined period and the ratio of the period and the pulse width is set. Pulse signal S1 of 500 or more
Generating a search interval circuit and the pulse signal S
An amplification modulation circuit for generating a pulse signal S2 in which a large number of pulses are superimposed on the latter half of each pulse of 1;
2, a light emitting element that emits light, a light receiving element that receives reflected light from the detected light emitted from the light emitting element, and a light receiving amplifier circuit that inputs an output signal S3 of the light receiving element and outputs a drive signal S4 of the actuator. And turning on / off the power source of the amplification modulation circuit and the light receiving amplification circuit by the pulse signal S1.
It is applied to an object detection operation device including a control circuit that controls by the presence or absence of, and the following technical means is adopted. That is,
The search interval circuit generates the signal S1a composed of a plurality of pulse groups having a pulse width smaller than the predetermined width from the pulse signal S1, and the amplification modulation circuit outputs the pulse signal to the latter half of each pulse of the pulse group. The object detection operation device is characterized by generating a pulse signal S2a in which a single pulse signal portion of S2 is superimposed.

The light emitting element and the light receiving element may be elements that are compatible with ultrasonic waves or electromagnetic waves.

[0008]

2A shows the signal S1a and the signal S2a of the present invention.
2B shows a waveform for one cycle, and FIG. 2B shows the signal S of the conventional example.
1 shows the waveform of one cycle of the signal S2. Calculating the required power from these waveforms, assuming that the input currents of the amplification modulation circuit and the light receiving amplification circuit are 1 mA and the input current of the light emitting element 3 is 50 mA with reference to the current commercial product, respectively. ) (B) Amplification / modulation circuit of the present application 0.6 ms × 2 × 1 mA + 0.05 ms × 2 × 50 mA = 6.2 ms · mA Photoreception amplifier circuit 0.6 ms × 2 × 1 mA = 1.2 ms · mA Total 7 .4 ms · mA Conventional example Amplification / modulation circuit 1 ms × 1 mA + 0.05 ms × 5 × 50 mA = 13.5 ms · mA Light receiving amplifier circuit 1 ms × 1 mA = 1 ms · mA Total 14.5 ms · mA , The power consumption was reduced to about 1/2.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 and 2 (a). Although FIG. 1 is common to the conventional example, the signals S1a and S2 are
a is different. Signals S1 and S2 of FIG. 2B show waveforms of one embodiment of the signals S1 and S2 of FIG. 3, and signals S1a and S2a of FIG. 2A are changed to signals S1 and S2 of FIG. 2B. Corresponding. In FIG. 1, signals S3a and S4a corresponding to signals S3 and S4 are shown, but waveforms are omitted.

As shown in FIG. 2 (b), the conventional signal S2 has a period of 2 seconds and a pulse width of 50 μs and a pulse interval of 50 μs.
The pulse signal (current is 50 mA) is used to stabilize the operation, but in the present application, the signal S2a is composed of a single pulse signal (current 50 mA) having a pulse width of 50 μs and a period of 2 seconds. In this embodiment, four AA batteries are used, and the detection distance is 5
A 0 cm object could be detected continuously for more than 2 years.

[0011]

The present invention has the following excellent effects. That is, (1) the required power of the amplifier circuit can be reduced to about 1/2, so that it becomes possible to use the micropower source such as a dry battery for a long time. (2) Since the pulse width of the light emitting element can be narrowed, it is possible to prevent the influence of the flicker of the fluorescent lamp, the reflected light from the water surface, etc., which have conventionally been the cause of malfunction, and the detection operation is stable. .

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an embodiment common to the present invention and a conventional device (however, the present invention and the conventional example have different input / output signals).

FIG. 2A is a signal S1a and a signal S2a of the present invention.
2B shows a waveform for one cycle, and FIG. 2B shows the signal S of the conventional example.
1 shows the waveform of one cycle of the signal S2.

FIG. 3 is an explanatory diagram of waveforms of various parts of a conventional example.

[Explanation of symbols]

1 search interval circuit 2 amplification modulation circuit 3 light emitting element 4 light receiving element 5 amplification circuit 6 actuator 7 control circuit 8 power supply S1, S1a pulse signal S2, S2a pulse signal S1 ₀ , S3, S3 ₀ , S4 signal S3a, S4a pulse signal

Claims (2)

[Claims] 1. A search interval circuit for generating a pulse having a predetermined width at a predetermined cycle and generating a pulse signal S1 having a ratio of the cycle to the pulse width of 500 or more, and a second half of each pulse of the pulse signal S1. An amplification and modulation circuit for generating a pulse signal S2 in which a large number of pulses are superimposed on each other, a light emitting element for emitting light by the pulse signal S2, and a light receiving element for receiving the reflected light of the light emitted from the light emitting element by a detected object, A light receiving amplifier circuit that inputs an output signal S3 of the light receiving element and outputs a drive signal S4 of an actuator, and a control circuit that controls ON / OFF of the power source of the amplification modulation circuit and the light receiving amplifier circuit by the presence or absence of the pulse signal S1. And a plurality of pulse groups having a pulse width smaller than the predetermined width for the pulse signal S1. And a pulse signal S2a in which the single pulse signal portion of the pulse signal S2 is superimposed on the latter half of each pulse of the pulse group. Detection operation device. 2. The object detection operation device according to claim 1, wherein the light emitting element and the light receiving element are elements corresponding to ultrasonic waves or electromagnetic waves.