JPH0538587U - Detector - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to reduce the number of detection areas arranged for each distance and set the spot diameters of the respective detection areas to substantially the same size to achieve uniformization. [Structure] The detection area 4 (4a, 4b, 4c) is formed by being divided into a plurality of areas within the intrusion monitoring area with reference to the mounting position P1 of the detector body 1. Each detection element 2 (2a, 2
b, 2c) is a length a inversely proportional to the detection distance r (r1, r2, r3) from the mounting position P1 of the detector body 1 to the center position of the ground surface 3 of each detection area 4 (4a, 4b, 4c).
(A1, a2, a3), each detection area 4 (4
Change in radiant energy between a, 4b, 4c) is detected.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a detector for detecting a human body moving between detection areas in which an intrusion monitoring area is divided into a plurality of areas according to distance.

[0002]

[Prior Art]

 A detector that detects changes in radiant energy (infrared energy) in the intrusion monitoring area and detects an illegal entry of the human body and outputs an alarm is a human body between detection areas divided into multiple areas in the intrusion monitoring area. The optical system is configured to have a single optical system including a concave mirror, a convex lens, and the like that collects infrared energy that accompanies the movement of the, and a detection element that detects the infrared energy collected by the optical system.

Here, as the detection element, as shown in the configuration and output waveforms of FIGS. 3A and 3B, the solar light is output by outputting signals having different polarities as the human body moves in the detection area. A differential type detection element 12 is used which is composed of a pair of pyroelectric elements 12a and 12b capable of preventing the influence of disturbance such as.

Further, in the conventional detector of this type, as shown in FIG. 4, the viewing angles θ (θ1, θ2 of the detection areas 11a, 11b, 11c, 11d, 11e with respect to the mounting position P1 of the detector main body 13 are shown. , Θ3, θ4, θ5) are equal to each other, the optical system and the differential detection element 12 are arranged.

[0005]

[Problems to be solved by the device]

 However, in the conventional detector described above, the detection distance r (r1, r2, r3, r4, r5) from the mounting position P1 of the detector main body 13 to the center of the ground surface of each detection area 11a, 11b, 11c, 11d, 11e Since the detection beam spot diameter D (D1, D2, D3, D4, D5) was in a proportional relationship, the longer the detection area 11 is, the larger the spot diameter D becomes. In order to achieve uniformity, the number of detection beams in the intrusion monitoring area increased, and it was necessary to arrange many detection areas 11 accordingly.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to reduce the detection area and to make the spot diameter of each detection area arranged by distance uniform. To provide a container.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the detector according to the present invention has a plurality of detection areas divided and formed in the intrusion monitoring area based on the mounting position of the detector body, and changes in radiant energy between the detection areas. In a detector provided with a plurality of detection elements corresponding to the respective detection areas, the detection elements are shorter as the detection distance of each detection area from the mounting position of the detector main body becomes longer. It is characterized by being formed into a length.

[0008]

[Action]

 The detection area is divided into multiple parts within the intrusion monitoring area based on the mounting position of the detector body. Further, each detection element is formed to have a shorter length as the detection distance of each detection area from the mounting position of the detector body is longer, and detects a change in radiation temperature between the detection areas.

[0009]

【Example】

 FIG. 1 is a diagram showing an embodiment of a detector according to the present invention, and is a diagram schematically showing the state of the spot diameter of each detection area. The detector according to this embodiment is applied to, for example, detection of a human body moving between detection areas in which the intrusion monitoring area is divided into a plurality of areas, and spots of detection beams in the detection areas arranged according to a distance. The diameters are formed to be almost the same size for uniformization.

In the detector body 1, three rectangular detection elements (elements) 2 (2a, 2b, 2c) as shown in FIG. 2 are arranged in parallel in the vertical direction. It is attached to the ceiling and walls at a height of H above the ground surface (for example, floor surface) 3. Then, the shape of each detection element 2 is projected through a single concave mirror (not shown) such as a circular mirror or an optical system such as a convex lens to form a detection area.

With reference to the mounting position P1 of the detector body 1, the three detection areas 4 of the short-distance area 4a, the medium-distance area 4b, and the long-distance area 4c from each detection element 2 toward the ground surface 3 are provided. It is arranged.

Further, each area 4a, 4b, 4c will be described. The short-distance area 4a is formed from the upper detection element 2a toward the front of the ground surface 3, that is, the position closest to the mounting position P1. ing.

Further, the middle distance area 4b is formed at a position farther from the middle detection element 2b toward the ground surface 3 than the short distance area 4a with reference to the mounting position P1. Further, the long distance area 4c is formed at a position farther from the lower detection element 2c toward the ground surface 3 than the middle distance area 4b with the mounting position P1 as a reference. That is, the detection area 4 is formed toward the ground surface 3 in the order of the short-distance area 4a, the medium-distance area 4b, and the long-distance area 4c with respect to the mounting position P1.

Here, the lengths of the respective detection elements 2a, 2b, 2c are a1, a2, a3, respectively, and a bisector of the viewing angle θ with respect to the mounting position P1 is a line connecting the mounting position and the ground surface 3. Assuming that the distance r (in other words, the distance from the mounting position P1 to the center of the ground surface 3 of each of the detection areas 4a, 4b, 4c) is r1, r2, r3, as shown in FIG. The triangle of each of the detection areas 4a, 4b, 4c where one end of the detection beam (corresponding to one point when the detection area 4 is a cone and one side when the pyramid is a pyramid) is in contact with the ground surface 3 when viewed from the side. In order to realize D1≈D2≈D3 so that the spot diameters D (D1, D2, D3) of the detection beam in the length direction at the bottom of the are formed, a1: a2: a3 = r1: r2: Each detection element 2a, 2b, so as to satisfy r3 Vertical length a1, a2, a3 and c are set. The detection distances r1, r2, r3 may be distances to the spot diameters D1, D2, D3 instead of the ground surface 3.

That is, the lengths a1, a2, a3 of the respective detection elements 2a, 2b, 2c are set to the detection distances r1, r2, r3 of the respective detection areas 4a, 4b, 4c from the mounting position P1 as shown in FIG. On the other hand, for example, there is an inverse proportional relationship, and the lengths a1, a2, a3 of the detection elements 2a, 2b, 2c are formed shorter as the distance r becomes longer.

Each of the detection elements 2a, 2b, 2c forms an optical system for the change of the radiant energy in the corresponding detection areas 4a, 4b, 4c in which the spot diameters D1, D2, D3 of the detection beams are equalized. The light is condensed and detected by a concave mirror (not shown) or the like, and determination processing such as presence / absence of human body intrusion and an alarm is performed based on the detection signal.

Therefore, in the above-described embodiment, since the length a of the detection element 2 is set almost in inverse proportion to the distance r from the mounting position P1 to the center of the ground surface 3 of the detection area 4, the spot a is set. The diameter can be made almost uniform, and in the conventional detector where each detection area is set at the same angle with respect to the mounting position, the spot diameter must be reduced at a short distance and the number of detection areas must be increased. The number of detection beams in the intrusion monitoring area can be reduced. Further, the spot diameters D1, D2, D3 in the length direction of the detection areas 4a, 4b, 4c, which are divided into a plurality of areas according to the distances, can be set to be substantially the same size for uniform detection. The sensitivity is also appropriate.

By the way, in the above-described embodiment, the lengths a1, a2, a3 of the detection elements 2a, 2b, 2c of the detection areas 4a, 4b, 4c formed according to the distance are determined by the mounting position P1 of the detector body 1. Although the case where the size is set to be approximately inversely proportional to the detection distances r1, r2, r3 of the detection areas 4a, 4b, 4c, the width b of the detection element 2 can be set in the same manner, and The spot diameter of the detection beam can be made uniform in the width direction of the detection areas 4a, 4b, 4c.

[0019]

[Effect of the device]

 As explained above, according to the detector of the present invention, the spot diameter becomes small at a short distance and the number of detection areas increases in the conventional detector in which each detection area is set at the same angle with respect to the mounting position. The detection area in the intrusion monitoring area can be reduced compared to what must be done. Further, the spot diameters of the respective detection areas arranged according to the distance can be made uniform to have substantially the same size, and the detection sensitivity becomes appropriate.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a detector according to the present invention, which is a diagram schematically showing the state of the spot diameter of each detection area.

FIG. 2 is a diagram showing a configuration example of a detection element in the same detector.

FIG. 3A is a configuration diagram of a differential detection element, and FIG. 3B is a diagram showing an output waveform when a human body moving between detection areas is detected.

FIG. 4 is a diagram schematically showing the state of the spot diameter of each detection area in a conventional detector.

[Explanation of symbols]

 1 Detector body 2 Detecting element 3 Ground surface 4 Detecting area P1 Mounting position r Distance to the center of the ground surface D Spot diameter a Detecting element length b Detecting element width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Fujio Higashi 6-11-23 Shimorenjaku, Mitaka City, Tokyo SECOM Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A detector in which a plurality of detection areas are divided and formed in an intrusion monitoring area with reference to the mounting position of the detector body, and a plurality of detection elements are provided corresponding to the respective detection areas, The detector, wherein each of the detection elements is formed to have a shorter length as the detection distance of each of the detection areas from the mounting position of the detector main body becomes longer.