JP2000028750A - Detection area adjusting device of passive sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the detection area-adjusting device of a passive sensor for adjusting the detection area while securing specific accuracy by a simple method. SOLUTION: A passive sensor 10 is provided with an optical unit 13 with a reflection mirror 16 and a pyroelectric element 14. A detection area-adjusting device 1 is provided with a convex mirror 2 for forming a reflection image corresponding to a detection area S of the pyroelectric element 14, has a zone marker 6 that becomes the confirmation reference of the detection area S on the mirror surface of the convex mirror 2, and is detachably mounted to the optical unit 13. The detection area-adjusting device 1 is mounted to the optical unit 13 in a specific position relationship, the detection area S of the passive sensor 10 is confirmed based on the mirror image of the convex mirror 2, and the optical unit 13 is adjusted and set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection area adjusting device suitable for adjusting a detection area of a passive sensor for detecting a human body or the like by using a pyroelectric element.

[0002]

2. Description of the Related Art A sensor of this kind is installed, for example, in a room or the like, and is used for detecting a person entering or exiting the room. According to a conventionally known infrared sensor, an optical unit and a pyroelectric element that receives light condensed by the optical unit and generates an electric signal are disposed in a cover. The system detects an incident infrared ray to detect the presence or absence of a human body.

In this type of sensor, it is necessary to set an area through which a person passes as a detection area. Conventionally, as a method of confirming the detection area of a sensor, there is a proposal in Japanese Patent Application Laid-Open No. 9-184754, for example. In the detection area display device disclosed in this publication, a light projection unit that is connected to the detector and emits visible light substantially in the same area as the detection area or in the outer periphery thereof, and a light projection unit that projects light in the detection area. A detection area adjustment operation unit for adjustment, a setting unit for setting a detection area of the detector with respect to the adjustment operation of the detection area adjustment operation unit, and an interlocking unit for interlocking the light emitting unit, and a power supply for supplying power to the light emitting unit One having a supply unit is disclosed. According to such a detection area display, it is possible to improve the adjustment at the time of installation of the detector and the efficiency of maintenance and inspection.

In addition to the above-described example, as means for properly grasping and adjusting the position of the detection zone, a lamp for confirming the detection area is provided and a position where the lamp can be seen in order to prevent unnecessary generation of the passive sensor. The mainstream is the so-called zone locator, which corresponds to the detection area, and the area adjustment dial type, which allows the position of the mirror to be set by adjusting the set ceiling height and the horizontal detection distance with the scale window linked to the mirror position. .

[0005]

However, the detection area display described in Japanese Patent Application Laid-Open No. 9-184754 is
The structure is complicated and there is a problem of cost due to the necessity of a power supply. Further, in the case of the area adjustment dial system, it is roughly set according to the ceiling height and the detection distance in the sensor installation environment, and it is substantially difficult to perform accurate adjustment. Furthermore, in the method using the zone locator, it is necessary to grasp the characteristics of the reflection mirror to some extent, and then walk in the area with at least two people evenly verifying and walking, which is extremely time-consuming. I can't get it.

In view of the above, it is an object of the present invention to provide a passive sensor detection area adjusting device capable of adjusting a detection area by a simple method while maintaining a predetermined accuracy.

[0007]

According to a first aspect of the present invention, there is provided a passive sensor detection area adjusting apparatus comprising an optical unit having a reflecting mirror and a pyroelectric element. A convex mirror capable of forming a reflection image corresponding to the detection area of the pyroelectric element, the convex mirror being attached to the optical unit in a predetermined positional relationship, and a passive sensor based on the mirror image. The detection area is checked and set. According to a second aspect of the present invention, there is provided a passive sensor detection area adjusting device according to the first aspect, wherein the convex mirror is detachably attached to the optical unit. Further, in the passive sensor detection area adjusting device according to the third aspect, in addition to the configuration of the first or second aspect, a zone marker serving as a reference for confirming the detection area can be added to the mirror surface of the convex mirror.
According to a fourth aspect of the present invention, in addition to the configuration of the first to third aspects, an aiming marker serving as a position reference for observing the mirror image is added to the mirror surface of the convex mirror. It is configured to obtain.

According to the present invention, in a passive sensor provided with an optical unit for receiving light condensed by a reflection mirror by a pyroelectric element, when adjusting the detection area thereof, the reflection corresponding to the detection area of the pyroelectric element is adjusted. A convex mirror capable of forming an image is attached to the optical unit in a predetermined positional relationship. By applying a zone marker to the mirror surface of the convex mirror as a reference for confirming the detection area, the reflection image and the zone marker are projected on the mirror surface of the convex mirror so that the approximate position of the zone can be easily grasped.
The detection area adjustment device can be easily attached by simply opening the cover of the sensor, and can be removed from the optical unit after use.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a detection area adjusting device for a passive sensor according to the present invention will be described below with reference to FIGS. In this embodiment, FIG.
In this case, the passive sensor 10 is mounted on the ceiling in the room as shown in FIG. 3, and the cover 12 of the passive sensor 10 is removed, and the detection area adjusting device 1 is mounted. In FIG. 1, a passive sensor 10 has its base or base 11 fixed in place on the ceiling, and in this example, a cover 12 preferably made of polyethylene material is attached to the base 11. The cover 12 is used as a visible light cut filter.

In the cover 12 of the passive sensor 10,
An optical unit 13 including a pyroelectric element 14 and a reflection mirror 16 (a concave mirror or the like) is mounted, and the light collected by the reflection mirror 16 via the cover 12 can be received by the pyroelectric element 14. I have. The light condensed by the reflection mirror 16 is received by the pyroelectric element 14, and a detection signal is generated by a signal processing circuit or the like (not shown) mounted on the circuit board 15.

The reflection mirror 16 of the optical unit 13 sets a detection area S so as to reflect light in a region indicated by a chain line in FIG. The optical unit 13 is supported by the base or the base 11 so as to be rotatable by a predetermined angle in the vertical and horizontal directions in the cover 12. By appropriately rotating the optical unit 13, the optical unit 13 The detection area S can be changed. A pyroelectric element 14 and a reflection mirror 16 are fixed to the optical unit 13 that can be rotated in the vertical and horizontal directions, so that the positional relationship between the pyroelectric element 14 and the reflection mirror 16 does not change. . Further, the positional relationship between the reflection mirror 16 and the convex mirror 2 when a detection area adjusting device described later is attached is not changed.

In FIG. 1, a detection area adjusting device 1 of the present invention includes a convex mirror 2 capable of forming a reflection image corresponding to a detection area of a pyroelectric element 14. As shown in FIG. 1, the detection area adjusting device 1 includes a cover 1 of a passive sensor 10.
2 is removed and attached to the optical unit 13 in a predetermined positional relationship, and the detection area of the passive sensor 10 is confirmed and set based on the mirror image.

FIGS. 2 and 3 show a detection area adjusting device 1.
Is shown. The periphery of the convex mirror 2 is held by a holder 3. The holder 3 is provided with a fixing arm 4 projecting to the rear side of the convex mirror 2. Fixing arm 4
Is configured so as to pinch the optical unit 13 in place by the elasticity of the spring 5, whereby the convex mirror 2 can be detachably attached to the optical unit 13.
A reflection image corresponding to the detection area S of the pyroelectric element 14 is formed on the convex mirror 2 of the detection area adjustment device attached to the optical unit 13 via the fixing arm 4 as shown in FIG.

Further, in the detection area adjusting device 1 according to the present embodiment, a zone marker 6 serving as a reference for confirming the detection area S is provided on the mirror surface of the convex mirror 2. The zone markers 6 are marked so as to coincide with the detection zones of the passive sensor. In the case of this example, a plurality of zone markers 6 are arranged at predetermined pitches in the vertical and horizontal directions as shown in FIG. The zone marker 6 may be one in which the mirror surface of the convex mirror 2 is painted or a mark piece is adhered. Further, as shown in FIG. 2, an aiming marker 7 serving as a position reference when observing the mirror image is provided on the mirror surface of the convex mirror 2. FIG. 4 is a schematic diagram showing a positional relationship between the zone marker 6 of the convex mirror and the detection zone of the detection area adjusting device according to the present embodiment. As shown in FIG. 4, the adjuster adjusts his / her image directly to the aiming marker 7 and moves the optical unit 13 so that the detection zone appears on the zone marker 6.
By arranging the aiming marker 7 in this way, a reflection image when the convex mirror 2 is observed directly facing the aiming marker 7 can be obtained.
It can be made to substantially coincide with the detection area S of the pyroelectric element 14.

In the above configuration, the cover 12 is attached to the base 11 during normal use, and light incident through the cover 12 is condensed on the pyroelectric element 14 by the reflection mirror 16. For example, when an infrared sensor is used, when a person enters the detection area S, the temperature of the human body can be sensed and the human body can be reliably detected.

According to the present invention, as shown in FIG.
Is opened, and the appropriate position of the optical unit 13 is clamped by the fixing arm 4 of the detection area adjustment device 1, so that the detection area adjustment device 1 is attached and fixed to the optical unit 13 in a predetermined positional relationship. At this time, a reflection image of the background appears on the mirror surface of the convex mirror 2, and the optical unit 13 is rotated up and down or left and right so that the reflection image overlaps the zone marker 6 corresponding to the detection area S. Adjust S.

Therefore, when the convex mirror 2 is observed by the detection area adjusting device 1 while facing the aiming marker 7,
The approximate position of the detection zone can be easily grasped based on the zone marker 6, and the detection area of the passive sensor can be easily adjusted. As described above, the detection area adjusting device 1 can be easily attached only by opening the cover 12 of the passive sensor 10, and can be easily removed from the optical unit 13 after use.

[0018]

As described above, according to the present invention, it is possible to easily and accurately grasp where a zone has reached within an area by visual observation in this type of passive sensor, and it is excellent in operability. A detection area adjustment device is realized. In particular, the detection zone can be immediately grasped at the site, which is excellent in response at the site and is not affected by the environment of the site. In addition, it has a compact configuration,
Easy to carry and excellent in handling. Further, there is an advantage that an AC power supply or the like is unnecessary, and that an inspection can be easily performed by one person.

[Brief description of the drawings]

FIG. 1 is a schematic diagram in which a detection area adjusting device according to an embodiment is attached to a passive sensor.

FIG. 2 is a front view of the detection area adjusting device according to the embodiment.

FIG. 3 is a side view of the detection area adjusting device according to the embodiment.

FIG. 4 is a schematic diagram showing a positional relationship between a zone marker of a convex mirror and a detection zone of the detection area adjusting device in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detection area adjustment apparatus 2 Convex mirror 3 Holder 4 Fixing arm 5 Spring 6 Zone marker 7 Aiming marker 10 Passive sensor 11 Base or base 12 Cover 13 Optical unit 14 Pyroelectric element 15 Circuit board S Detection area

Continued on the front page (72) Inventor Yoichi Inoue 1-6-6 Moto-Akasaka, Minato-ku, Tokyo Inside Sogo Police Security Co., Ltd. (72) Inventor Takahiro Kumai 1-3-9 Moto-Akasaka, Minato-ku, Tokyo Sogo Electric Industry Co., Ltd.

Claims (4)

[Claims] An apparatus for adjusting a detection area of a passive sensor including an optical unit having a reflection mirror and a pyroelectric element, comprising: a convex mirror capable of forming a reflection image corresponding to the detection area of the pyroelectric element. A detection area adjusting device for a passive sensor, wherein the convex mirror is attached to the optical unit in a predetermined positional relationship, and the detection area of the passive sensor is confirmed and set based on the mirror image. 2. The apparatus according to claim 1, wherein the convex mirror is detachably attached to the optical unit. 3. The detection area adjusting device for a passive sensor according to claim 1, further comprising a zone marker on the mirror surface of the convex mirror, which serves as a reference for checking a detection area. 4. The detection area adjusting device for a passive sensor according to claim 1, further comprising an aiming marker on a mirror surface of said convex mirror as a position reference when observing a mirror image thereof.