JPH0481130B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention The present invention relates to an infrared detection device that is installed, for example, on the ceiling or wall of a building and used to detect the presence or absence of people moving around the area. .

(b) Background of the Invention Usually, this type of infrared detection device has an infrared detection element installed at the focal point of a condensing mirror that condenses infrared rays, and detects objects such as a human body that have come within the field of view of this condensing mirror. 2. Description of the Related Art A device is known that detects infrared rays emitted from a body using an infrared detection element and detects the presence or absence of a detected object based on the amount of change in the infrared rays.

By the way, when installing this infrared detection device on the ceiling or wall, it is set so that the infrared light corresponds to a specific location to be detected, such as the entrance to a passageway, but as it is well known, infrared light is invisible light, so it must be set by visually checking it. Therefore, a visible light source such as a light emitting diode is installed near the device, and the visible light is set in the same direction as the infrared detection direction.
It is desired to develop a visual setting means that allows setting while visually checking.

However, in this case, the focus of the infrared detection element and the corresponding visible light source do not match, and as a result, the projection direction of visible light rays relative to the detection direction of infrared rays is significantly shifted, making it difficult to accurately set the infrared detection area. I couldn't do it. Further, as this type of visibility setting means is applied, the combination structure of these parts becomes complicated, making it impossible to obtain an accurate visibility setting means.

(c) Purpose of the Invention Therefore, an object of the present invention is to provide an infrared detection device that can set an infrared detection area by aligning the focal points of a visible light source and an infrared detection element.

(D) Summary of the Invention This invention provides an infrared detection area of the pyroelectric element and an infrared detection area of the pyroelectric element between opposing parts of a two-element built-in infrared pyroelectric element installed corresponding to the focal point of a condensing mirror that receives infrared rays. The invention is characterized in that it is an infrared detection device comprising a light emitter of a visible light source arranged for corresponding positioning and projection.

(E) Effects of the Invention According to this invention, the focus of the infrared pyroelectric element and the visible light source via the filter provided at the center of the element coincide, so that the visible light emitted from the light emitter of the visible light source is The projection direction corresponds to the infrared detection area and is projected at the same position. Therefore, the infrared detection setting area can be positioned and set according to the projection of this light emitter, and the infrared rays can be set while being visually recognized as if they were visible light.

Therefore, not only is it possible to completely eliminate problems such as poor settings caused by misalignment of the focal point, but since the visible light source is integrated with the infrared pyroelectric element, the structure is simplified, making handling and management easier. , the mounting operation on the board etc. becomes extremely simple.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawings show an infrared detection device, and in FIGS. 1 to 3, this infrared detection device 11 includes a condensing mirror 12 that reflects and projects visible light and condenses invisible infrared light, and this condensing mirror 12. an infrared pyroelectric element 13 installed corresponding to the focal point of the infrared pyroelectric element 13, its element holder 14, and a visible light source LED (light emitting diode) 1 disposed integrally with the infrared pyroelectric element 13.
5, 15, a filter 16 that regulates the light emitting direction of the LEDs 15, 15, and a case body 17 that houses and holds these.

The above-mentioned condensing mirror 12 has an arc shape, and its lower end is supported by the case body 17 via a support frame 18 so as to be angularly displaceable, and the condensing mirror 12 has a light beam that adjusts the inclination of the optical axis of the condensing mirror 12. It is supported by the case body 17 via an axis adjustment mechanism (not shown). As a result, the condensing mirror 12 is allowed to rotate so as to be angularly displaceable, and is maintained at its predetermined set position.

The inner circumferential surface of the condensing mirror 12 is provided with concave mirrors 19 of polygonal segments capable of receiving light from a plurality of optical axes.
... are arranged so that each focal point of the refracted infrared rays is concentrated at one point in the infrared pyroelectric element storage section 20, and the above-mentioned infrared pyroelectric element 13 is arranged at this focal point.

The above-described infrared pyroelectric element 13 has a two-element built-in structure in which infrared detecting elements 21 and 21 are installed in parallel on the left and right sides, and is mounted on an element base 22. It is provided to receive infrared rays from the top surface.

By the way, the infrared pyroelectric element 13 is a pair of electric elements, with one element 21 set on the anode side and the other element 21 on the cathode side, and having a function of determining which element 21 was detected first. This feature allows it to detect, for example, the direction in which a person is coming in at the same time as detection.

Furthermore, between the parallel opposing parts of the left and right pair of infrared detection elements 21, 21 on the element base 22, there is a
The element base 22 on which the LEDs 15, 15 are placed is placed in the center of the element holder 14 described above. Furthermore, on the element holder 14, the LEDs 15,
A shielding cylindrical body 23 for shielding the external light emitted from the cylindrical body 15 is disposed, and a filter 16, which will be described later, is disposed at the open upper surface of the cylindrical body 23 to be closed.

The above-mentioned filter 16 is formed into a disc shape using a resin material such as polycarbonate that is colored in an appropriate color to allow infrared rays to pass through and block visible rays, and has a transparent window in the center that allows visible rays to pass through. 24 is opened, and the image is projected to the outside through this transmission window 24.
The visible light projection areas 25 of the LEDs 15, 15 are accurately positioned and projected in accordance with substantially the same dimensions of the infrared detection areas 26, 26 set in the light receiving range of the above-mentioned infrared pyroelectric element 13.

Therefore, it is only necessary to set the infrared detection areas 26, 26 based on this visible light projection area 25. When setting, visible light is emitted at all times, and the infrared rays are set while visually checking them as if they were visible light. can do.

The above-mentioned element holder 14 is mounted on the upper surface of the central part of a board 27 on which each control component (not shown) is mounted, and this board 27 is fixed to the above-mentioned infrared pyroelectric element storage section 20.

In the figure, 28 is a power lamp, 29 is a protective cover, 3
0 is a connection terminal of the element holder.

In the infrared detection device configured as described above, first, the infrared detection device 11 is installed on the ceiling or wall surface of a room or the like corresponding to a specific position such as a passage to be detected. Next, the power of this device 11 is input, and the LEDs 15, corresponding to the infrared detection areas 26, 26,
15 and the emitted visible light projection area 2
5 and 25, adjust the overall angle of the condenser mirror 12 and adjust the angle of the condenser mirror 12 to a predetermined corresponding position and direction to be detected via the optical axis adjustment mechanism, and then turn on the LEDs 15 and 15. OFF
By doing so, the infrared detection device 11 is initially set to a desired detection position and direction.

When, for example, a person enters the infrared detection areas 26, 26, the infrared pyroelectric element 13 detects the infrared rays emitted from the human body via the condensing mirror 12, and based on this detection signal, appropriate means are detected. For example, alarm means etc. may be taken.

Note that the LEDs 15 are not limited to a plurality of LEDs 15 and may be provided at one location.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a schematic explanatory diagram of an infrared detection device, FIG. 2 is an enlarged perspective view of a main part of the infrared detection device, and FIG. 3 is a longitudinal cross-sectional side view of a main part of the infrared detection device. It is. DESCRIPTION OF SYMBOLS 11... Infrared detection device, 12... Condensing mirror, 13... Infrared pyroelectric element, 14... Element holder, 15... LED, 16... Filter, 19...
...Concave mirror, 21...Infrared detection element, 24...Transmission window, 25...Visible light projection area, 26...Infrared detection area.

Claims (1)

[Scope of Claims] 1. A condensing mirror that receives light from a plurality of optical axes; a two-element built-in infrared pyroelectric element in which infrared detection elements are installed in parallel corresponding to focal points of the condensing mirror; a light emitting body of a visible light source disposed between parallel opposing parts of the pyroelectric element, and a transmission window that allows visible light from the light emitting body to be transmitted through in order to be positioned and projected in correspondence with the infrared detection area of the pyroelectric element. An infrared detection device comprising: a filter disposed opposite to the front surface of the light emitting body.