JPH06331437A - Dual element type infrared-ray human body detector - Google Patents

Abstract

PURPOSE:To develop and a form a detection beam similar to that of a four element type infrared-ray detector by using a dual element type infrared-ray detector. CONSTITUTION:In a dual element type human body infrared-ray detector wherein infrared rays emitted from a human body are converged by a covering device and detected by two infrared detection elements 2 through an infrared filter 6 so that a detection signal is outputted, an infrared-ray non-transmission band 7 crossing the two infrared detection elements 2 is formed in the infrared filter 6 disposed in front of the two infrared detection elements 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a dual type infrared human body detector in which infrared rays emitted from a human body are detected by two infrared ray detecting elements.

[0002]

2. Description of the Related Art An infrared human body detector for detecting a human body by receiving infrared rays emitted from a human body is an infrared human body detector which is constructed by a pyroelectric element or the like by using a temperature difference between the human body and a background as a difference in the amount of infrared energy. The infrared human body detector using such a pyroelectric element requires a light emitting device as compared with a light projecting system that projects near infrared light and detects the amount of change in reflected light. First, since the detection area can be easily set by changing the conditions of the optical system of the light collector, it is rapidly spreading as an automatic lighting switch as well as a security intruder.

Since an infrared human body detector using such an infrared detecting element is a method for detecting the movement of a heat source in principle, it is detected when the amount of movement of the human body is large, such as when entering or leaving a room. Although the level of the signal becomes relatively high, the level of the detection signal decreases when the body or a part of the body moves only slightly, such as when sitting in a room. Therefore, the set threshold value is not stably exceeded, and the reliability is deteriorated. Therefore, even if there are people in the room, a situation occurs in which the indoor lighting, the air conditioner, and the like are stopped.

By the way, in an actual infrared human body detector, as shown in FIG. 5, the infrared detecting element receives infrared rays from the human body, and its output is a preset threshold value Vth.
When, for example, exceeds three times, a timer is activated and the presence or absence of a detection signal is monitored for a certain monitoring time t1, and the time t
If the human body is detected twice within 1, it is judged that a human continues to exist, the timer is further extended by t1, and a control signal is output to maintain the operating state of the load. However, if the movement of the person in the room is small, the movement of the human body cannot be detected even when there is a person in the room.Therefore, it is judged that there is no person, and the load on the indoor lighting and air conditioning equipment is stopped. Will end up.

If the monitoring time t1 is set to be long so that the load is not stopped when a person is in the room, the load does not stop for a long time even after the person leaves the room. It had the drawback of becoming
By the way, in the conventional dual-type infrared detector, a detection beam from the detection area is focused on the two infrared detection elements by disposing a condenser such as a multi-segment lens in front of the two infrared detection elements. However, since the pair of detection beams 8a and 8b developed and formed in the detection area at this time has a vertically long dimension as shown in FIG. 6 according to the shape of the infrared detection element, It is larger than the human body M, so that a pair of detection beams 8a,
Even if the human body M slightly moves in one of the detection beams 8b, there is a problem that the change in the proportion of the human body in the detection beams 8a and 8b hardly changes and the detection signal is not output. ing.

Therefore, in order to eliminate such a problem,
By using a so-called 4-element type infrared detection element that collects infrared rays in the detection area onto four infrared detection elements using a condenser such as a multi-divided lens or a mirror, as shown in FIG. One detection beam 81-84
An infrared human body detector with improved sensitivity has been developed by expanding and forming a detection beam with a pair of
Since such a four-element type infrared detector is a custom-made product, it has a drawback that it is costly, and moreover, the wiring is also routed and the influence of noise becomes large.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to use an inexpensive dual type infrared detecting element to obtain a 4-element type It is an object of the present invention to provide a dual type infrared detector capable of developing and forming a detection area as dense as an infrared detector.

[0008]

The present invention has been developed to solve the above-mentioned problems, and an infrared filter disposed in front of the two elements of a dual type infrared detector traverses the two elements. It is characterized by forming an infrared opaque band.

[0009]

According to the dual-type infrared human body detector of the present invention, since the two infrared detecting elements are divided into the upper and lower parts by the infrared opaque band, the inside of the detection beam expanded and formed by the two elements. Even when a person moves, the output is lost in the part corresponding to the opaque band of the two elements.

Therefore, the detection beam expanded and formed by the condenser is substantially the same as the four-element type infrared detecting element, so that the same sensitivity as that of the four-element type infrared detecting element can be obtained. .

[0011]

EXAMPLE An example according to the present invention will be described below. FIG. 3 is a block diagram showing a basic schematic configuration of the infrared detector of the present invention. Reference numeral 1 denotes an optical condenser, which is composed of a mirror and a multi-divided lens, and condenses the detection beam that has been developed and formed on the infrared detection element 2. This infrared detector 2
Is composed of a pyroelectric element, and the output of the infrared detection element 2 is amplified by the amplifier 3 to a level required for signal processing. A determination processing unit 4 determines whether or not the output level of the detection signal from the infrared detection element 2 amplified by the amplification unit 3 exceeds a preset threshold value Vth. Output a signal. An output unit 5 receives a human body detection signal from the process determination unit 4 and outputs a control signal to control loads such as lighting equipment and air conditioners.

FIGS. 1 and 2 show the construction of the main part of the present invention, and FIG. 2 is an external view of a dual type infrared detector.
The infrared detection element 2 is built in a metal case 9 having leads 91 to 93 at the bottom thereof, and the window 1 is provided on the upper surface of the metal case 9.
0 is formed, and the window 10 is provided with an infrared filter 6 having an infrared opaque zone 7 formed at the center thereof. Figure 2
The positional relationship between the infrared filter 6 and the infrared detecting element 2 is shown. An infrared opaque band 7 formed in the center of the infrared filter 6 is arranged so as to cross the two infrared detecting elements 2 and 2.

According to the infrared human body detector A of the present invention as described above, since the infrared filter 6 is separated into the upper and lower parts 6a and 6b by the infrared opaque band 7, two infrared detecting elements 2 and 2 are provided. Each of which is divided into two parts, that is, the upper part and the lower part. FIG. 4 shows the detection beams expanded and formed by the dual type infrared detector A of the present invention. One set of detection beams expanded and formed by the two infrared detecting elements 2 and 2 is the infrared filter 6. A part corresponding to the infrared opaque band 7 formed in the center becomes a dead band 7 ', and is composed of four parts 81 to 84. Therefore, according to the infrared detector A of the present invention as described above, it is possible to expand and form a detection beam similar to that of the four-element type infrared detector by using the dual-type infrared detection element. Even if there is only a slight movement of the human body, the change in the proportion of the human body in the detection beam will be larger than in the case of the conventional thick beam, and the rise of the human body detection signal will be faster. The detection ability is much improved.

[0014]

As will be understood from the above, according to the infrared detector of the present invention, a commonly used dual element type infrared detecting element is used without using a 4-element type infrared detecting element. Since a detection beam similar to that of a four-element type infrared detector can be developed and formed, an inexpensive infrared detector with improved sensitivity can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing an external configuration of an embodiment of a dual-type infrared detector of the present invention.

FIG. 2 is a diagram showing a positional relationship between an infrared filter and an infrared detection element.

FIG. 3 is a block diagram showing an internal configuration of an infrared detector of the present invention.

FIG. 4 is an explanatory diagram of a detection beam developed and formed by the infrared detector of the present invention.

FIG. 5 is a time chart explaining the operation of a conventional infrared detector.

FIG. 6 is an explanatory view of a detection beam developed and formed by a conventional dual type infrared detector.

FIG. 7 is an explanatory diagram of a detection beam developed and formed by a conventional 4-element infrared detector.

[Explanation of symbols]

 A ... Infrared detector of the present invention 1 ... Concentrator 2 ... Infrared detecting element 3 ... Amplifier 4 ... Discrimination processing unit 5 ... Output unit 6 ... Infrared filter 7 ... ..Infrared opaque zone 8,8a, 8b ... Detection beam 81,82,83,84 ... Detection beam 7 '... Detection beam dead zone M ... Human body

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

FIGS. 1 and 2 show the construction of the main part of the present invention, and FIG. 2 is an external view of a dual type infrared detector.
The infrared detecting element 2 is built in a metal case 9 provided with pins 91 to 93 at the bottom, and a window 10 is provided on the upper surface of the metal case 9.
The window 10 is provided with an infrared filter 6 having an infrared opaque zone 7 formed in the center thereof. FIG. 2 shows the positional relationship between the infrared filter 6 and the infrared detection element 2. The infrared opaque band 7 formed in the center of the infrared filter 6 is arranged so as to cross the two infrared detection elements 2 and 2. Has been done.

Claims (1)

[Claims] 1. A dual-type infrared human body detector that collects infrared rays emitted from a human body by a condenser, detects the infrared rays through two infrared ray detecting elements, and outputs a detection signal. A dual infrared human body detector characterized in that an infrared opaque band is formed so as to cross two infrared detecting elements in an infrared filter arranged in front of the element.