JPH0522872Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to an optical axis adjustment device in an infrared detector used in a security alarm system or the like.

<Conventional technology> Infrared detectors have an optical condensing system and have the advantage of being able to obtain a clear detection range, but on the other hand, they are less sensitive than detectors that use ultrasound or microwaves, which have wider directivity. The disadvantage is that it takes time to adjust the detection direction. In the case of an infrared detector for crime prevention or automatic doors, the direction of the optical axis is adjusted so that it can be installed in a high place such as a ceiling or wall and detect a human body passing through a predetermined location. All conventional optical axis adjustment means have been installed on a ceiling or the like and then adjusted at an unstable high place.

Therefore, the present applicant has devised an optical axis adjustment device for an infrared detector that can adjust the optical axis on the ground using a method with little individual difference before installing it on the ceiling, etc., and has filed an application (Japanese Patent Laid-Open No. 57-139893). (see official bulletin). This optical axis adjustment device has a movable part that is rotatably attached to a fixed part and interlocks with the optical axis, and a deflection of the optical axis at the detection distance with the detection distance on the horizontal axis and the deflection angle of the optical axis on the vertical axis. It is configured to include a display section in which a curve with a constant angle is graphically depicted on a linear curved surface and indicated on the movable section, and a reference line for reading the diagram of the display section provided on the fixed section.

<Problem to be solved by the invention> However, the method of calculating the desired deflection angle of the optical axis using such a chart requires mathematical and physical knowledge and training. If used by someone who does not know the method, or if the calculation method is incorrect, there is a problem that appropriate adjustment cannot be obtained. Another disadvantage is that when a cover is attached to cover the movable part etc. after the optical axis adjustment, the movable part moves slightly and the optical axis direction after adjustment may change.

Therefore, in the present invention, when the chassis and the cover are assembled into a container, the distance of the desired detection area and the installation height of the display window can be adjusted by using a rotating operation part such as a lever. An object of the present invention is to provide an optical axis adjustment device for an infrared detector that can accurately adjust the optical axis simply by performing an operation to match the .

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above object, an optical axis adjustment device for an infrared detector is configured as follows. That is, a container is constituted by a chassis and a cover that transmits infrared rays, and an infrared detector and an optical system for condensing light to the detector are installed in the chassis and built into the container. In the device for adjusting the optical axis by varying the system, the optical system is rotatably mounted on the chassis, and a rotation operation section provided on the optical system is inserted through an operation window of the chassis. A display body that is led out to the outside and lists information on the distance from the installation position to the detection area is slidably displaced on the inner surface of the chassis in conjunction with the rotation of the optical system, and the various pieces of information are displayed along with the sliding displacement. attached to the optical system so as to sequentially display external information from a display window opened in the chassis, and at a location near the display window on the outer surface of the chassis, information on the distance of the display body displayed on the display window. A display field for mounting height information is provided, and the angle of the display body and the optical system is determined based on the distance information displayed on the display window and the mounting height of the display field corresponding to the angle of the optical system. The features are that they are associated and engaged with each other so as to match.

<Operation> The human body to be detected walks horizontally on the floor or the ground, while the infrared detector is generally installed on the ceiling, and the ceiling and floor are usually parallel.
Therefore, once the mounting height of the ceiling surface or the like and the distance to the detection area to be set are determined, the adjustment angle of the optical axis by the optical system that matches them is inevitably determined.

Then, when the optical system is rotated using a rotation operation part such as a lever, the display body slides and displaces in conjunction with the rotation of the optical system, and the display on the display window changes. By simply changing the display on the display window so that the distance to the desired detection area matches the measured installation height value in the displayed display column, the optical axis of the optical system can be adjusted from the installation location. The angle is precisely adjusted to set the detection area at the desired distance.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a central vertical cross-sectional view of one embodiment of the present invention in an installed state;
The figures each show a rear view (a view seen from above in FIG. 1).

A hemispherical cover 13 made of an opaque plastic material that transmits infrared rays is fitted onto a substantially disk-shaped chassis 1, so that the chassis 1 has a container shape as a whole. A display window 2 and an operation window 3 are opened in the chassis 1, respectively.
A pair of rib-shaped bearing portions 5, 5 are provided on both sides of the operation window 3 (front and rear sides in FIG. 1) to protrude inward.

The optical system 4 for condensing infrared rays from the outside onto the infrared detector 11 is integrally formed with a plurality of reflecting surfaces (three are shown in the figure) for three-dimensionally expanding the detection area. A rotation operation lever 10 is inserted through the operation window 3 and protruded to the outside, and is rotatably connected to both bearing parts 5, 5 by a rotation support shaft 9. Therefore, the optical system 4 rotates around the rotation support shaft 9.
It is designed to be able to rotate within a predetermined angular range using the fulcrum as a fulcrum.

An infrared detector 11 is disposed at the focal point of this optical system 4, and this infrared detector 11 is also displaced together with the optical system 4. This infrared detector 11 and optical system 4
One optical axis is formed by one reflecting surface.
In the above embodiment, as shown in FIG. 1, three optical axes are formed by three reflecting surfaces arranged at different locations in the vertical direction in the installed state. When the chassis 1 and the cover 13 are assembled, the optical system 4 can be rotated by operating the rotation operating lever 10 from the outside, so that all the optical axes,
, are simultaneously and integrally displaced in the vertical direction with respect to the vertical plane.

A flexible and elastic sheet-like display body 6 is interposed between the chassis 1 and the optical system 4.
As shown in FIG. 3, on this display 6, numerical values representing the longest distance of the detection area with respect to the mounting height are displayed in a matrix on one side, and a part of the display 6 is also marked with the rotation operation described above. An engagement hole 15 into which the lever 10 is inserted is formed, and information UP and COWN indicating the direction of change of the detection area in response to the operation of the lever 10 is written on both sides of the engagement hole 15.

The display body 6 is configured so that the lever 10 is inserted into the engagement hole 15 with the above-mentioned written information facing the chassis 1.
0, and is slid onto the inner surface of the chassis 1 in conjunction with the rotation of the optical system 4 by operating the rotation operation lever 10. Here, the portion where the operation window 3 of the chassis 1 is formed has a curved shape centered on the rotation support shaft 9, and the display body 6 is attached to this curved portion by the contact portion 16 of the lever 10 and the optical system 4. By slidingly displacing while being pressed tightly and bending, the above-mentioned UP and DOWN can be controlled from the outside of the operation window 3.
The display is clearly visible. Further, since the display body 6 is closely pressed against the inner surface of the chassis 1 and the direction of sliding displacement is regulated by the guide parts 7 and 8 provided on both sides of the operation window 3, the display window 3
As shown in FIG. 2, numerical values are displayed in a horizontal row on the display 6 so as to be clearly visible, and as the lever 10 is operated, the numerical value display can be sequentially changed one horizontal row at a time.

Further, as shown in FIG. 2, a numerical display column 12 representing the ceiling height is provided at a location near the display window 2 on the outer surface of the chassis 1. Each numerical value representing the ceiling height in this display column 12 is written in correspondence with each numerical value on the display body 6 appearing on the display window 2.

Next, optical axis adjustment of the apparatus of the embodiment will be explained. The chassis 1 and cover 13, which are integrated into a container form, are attached to a mounting base 14 as shown in FIG.
The sensor is installed on a ceiling surface or the like via a sensor, but before installation, the optical axis is adjusted on the ground based on the installation location and detection area conditions. For example, if the ceiling height of the installation location is 3.0 m and the maximum distance you want to monitor is 10 m, operate the rotation operation lever 10 to change the numerical value displayed on the display window 2 of the display unit 6 while changing the display field. The numerical value "10" on the display 6 is adjusted to the position on the display window 2 corresponding to "3.0" of 12. As a result, the angle of the optical system 4 is set so that the maximum distance of the detection area is 10 m for a ceiling height of 3.0 m. After that, it is only necessary to attach it to a ceiling surface or the like using the mounting base 14.

In this way, the optical system 4 can be adjusted by simply operating the angle adjustment lever 10 from the outside and matching the value of the desired ceiling height in the value field 12 with the value of the longest distance of the desired detection area on the display 6. Since the optical axis can be adjusted to an angle that meets the conditions, no special knowledge or training is required, and the optical axis can be adjusted accurately with almost no risk of making a mistake.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but may include various modifications without departing from the scope of the claims. For example, in the above embodiment, the display window 2 and the operation window 3 are arranged on substantially the same plane, but if a material with excellent flexibility is used as the display body, this display body can be bent in substantially orthogonal directions. Alternatively, the display window and the operation window may be provided on planes perpendicular to each other.
Furthermore, although the above embodiments have exemplified an optical system having a plurality of reflective surfaces, it goes without saying that the present invention can also be implemented in the same way with an optical system having a single reflective surface.

<Effects of the invention> As described above, according to the optical axis adjustment device for an infrared detector of the present invention, when the chassis and cover are assembled in the form of a container, the rotary operation part such as a lever can be operated from the outside. Rotate the internal optical system,
By changing the display on the display window to the desired information in accordance with the information in the display column, the optical axis of the optical system can be precisely adjusted to an angle that sets the detection area at the desired distance from the installation location. . Therefore, even a person without any specialized education or training can easily and quickly perform accurate optical axis adjustment without making any mistakes, and the direction of the adjusted optical axis will not change when installing after adjustment. Nor.

In addition, the display window and operation window are formed on the chassis that supports the optical system, and the display body is interposed between the optical system and the chassis, which greatly simplifies the overall configuration and reduces manufacturing costs. .

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view of an embodiment of the present invention in an installed state. FIG. 2 is a rear view of the same as above before installation. FIG. 3 is a surface view of a part of the same as above. 1... Chassis, 2... Display window, 3... Operation window, 4... Optical system, 6... Display body, 7, 8... Guide section, 9... Rotation support shaft, 10... Rotation operation lever (rotating operation part), 11...infrared detector,
12...Display field, 13...Cover.

Claims (1)

[Claims for Utility Model Registration] (1) A container is constituted by a chassis and a cover that transmits infrared rays, and an infrared detector and an optical system for focusing light on the detector are attached to the chassis and built into the container. In the device for adjusting the optical axis by varying the optical system in the infrared detector, the optical system is rotatably mounted on the chassis, and a rotation operation provided on the optical system is provided. The part is inserted through the operation window of the chassis and guided to the outside, and a display body listing information on the distance from the installation position to the detection area,
The optical system is attached to the optical system so as to be slidably displaced on the inner surface of the chassis in conjunction with the rotation of the optical system, and to sequentially display the information to the outside from a display window opened in the chassis as the optical system is rotated. , at a location near the display window on the outer surface of the chassis,
A display field for information on mounting height for distance information of the display body displayed on the display window is provided,
The display body and the optical system are engaged with each other in association with each other such that the angle of the optical system matches the distance information being displayed on the display window and the mounting height of the display column corresponding thereto. An optical axis adjustment device for an infrared detector characterized by: (2) The utility model registration claim is characterized in that the rotation operation part is a lever integrally formed with the optical system, and the lever penetrates and engages with an engagement hole of the sheet-like display body. An optical axis adjustment device for an infrared detector according to scope 1. (3) A portion of the chassis where the operation window is formed is formed into a curved shape centered on the rotation support shaft of the optical system, and the display body is brought into contact with the inner surface of the chassis on both sides of the operation window, and An optical axis adjustment device for an infrared detector according to claim 1 or 2, characterized in that a guide portion for regulating the sliding direction is provided. (4) A portion of the display body corresponding to the operation window,
The infrared ray according to any one of claims 1 to 3 of claims 1 to 3, which is a registered utility model, characterized in that information about the operating direction of the rotating operation unit when varying the distance to the detection area is described. Detector optical axis adjustment device. (5) The display field is arranged along the display window, and the display field is set at a mounting height corresponding to each longest distance of the detection area of the display body displayed in a row on the display window. An optical axis adjustment device for an infrared detector according to any one of claims 1 to 4, which is characterized in that the device is formed by expressing a numerical value of .