JPS61126431A - Infrared detecting device - Google Patents

Abstract

PURPOSE:To set an infrared detection area accurately by providing a visible- light source integrally with a two-element incorporated type infrared pyroelectric element installed corresponding to the focus of a light collecting mirror, and making the focus of this visible-light source coincident with the focus of the infrared detecting element. CONSTITUTION:The infrared detecting device is constituted by storing the light collecting mirror 12 which collects infrared rays, the two-element incorporated type infrared pyroelectric element 13 installed corresponding to the focus of the light collecting mirror 12, an LED15 arranged as the visible-light source integrally with the pyroelectric element 13, a filter 16, etc., in a case body. Then, the visible-light projection area 25 of the LED15 is positioned accurately to the same size with an infrared detection area 26 set within the photodetection area of the pyroelectric element 13 to project light. Consequently, the LED15 is turned on the basis of the visible-light projection area 25 to view the infrared rays as if they were visible light rays, thereby setting the infrared detection area 26 accurately.

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 is used to detect the presence or absence of people moving in the vicinity. .

(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 human bodies that 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. For this purpose, 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 detection direction of infrared rays, so that the setting can be done while visually checking. development is desired.

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 greatly shifted, making it difficult to accurately set the infrared detection area. I couldn't. 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, it is an object of the present invention to provide an infrared detection device capable of setting 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 three-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) Effect of the Invention According to this invention, since the focus of the infrared pyroelectric element and the visible light source via the filter provided at the center of the element coincide, light is emitted from the light emitter of the visible light source. The projection direction of visible light 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 setting errors caused by misalignment of the focal point, but the visible light source is integrated with the infrared pyroelectric element, which simplifies the structure and facilitates handling and management. etc., the installation operation becomes extremely easy.

(f) Examples of the invention An embodiment of the present 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 reflects and projects visible light,
A condensing mirror 12 that condenses infrared rays of invisible light, an infrared pyroelectric element 13 installed corresponding to the focal point of the condensing mirror 12, an element holder 14, and the infrared pyroelectric element 1.
3, a visible light source LED (light emitting diode) 15.15, a filter 16 that regulates and controls the light emission direction of the LED 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 inclination of the optical axis of the condensing mirror 12 is It is supported by the case body 17 via an optical axis adjustment mechanism (not shown) that adjusts the optical axis. As a result, the condensing mirror 1
2 is allowed to rotate so as to be angularly displaceable, and is maintained in its predetermined set position.

The inner peripheral surface of the condensing mirror 12 includes a concave mirror 19 with a multifaceted segment capable of receiving light from a plurality of optical axes.
These concave mirrors 19' 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.

The above-mentioned infrared pyroelectric element 13 has infrared pyroelectric elements 2 on the left and right.
It has a three-element built-in structure in which the elements 21.1.21 are installed in parallel and is mounted on an element base 22.
It is provided to receive infrared rays from the upper surface of 21 and emit the light.

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 the detection.

Furthermore, a pair of left and right infrared detection elements 2 on the element base 22
Between the parallel opposing parts of 1.21, the above-mentioned LED 15.15
The element base 22 on which these elements are placed is placed in the center of the element holder 14 described above. Further, on the element holder 14, an LE is provided surrounding the outer periphery of the element base 22.
Shielding cylinder 23 for shielding external light emission of D15.15
is disposed, and a filter 16 (to be described later) is installed in the open upper surface of the filter 16.
is arranged to close.

□The above-mentioned filter 16 is formed into a disk shape using a resin material such as polycarbonate 1, which is colored in an appropriate color and allows infrared rays to pass through and blocks visible rays. A transmission window 24 that allows transmission is opened, and the visible light projection region 25 of the LED 15.15 projected to the outside through the transmission window 24 is an infrared detection region set in the light reception range of the infrared pyroelectric element 13. 26. Corresponding to approximately the same dimensions as 26, it is accurately positioned and projected.

Therefore, it is only necessary to set the infrared detection area 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. I can do it.

The above-mentioned element boulder 14 is connected to each control component (not shown).
The infrared pyroelectric element storage section 20 is fixed to the infrared pyroelectric element storage section 20 described above.

In the figure, 28 is a power lamp, 29 is a protective cover, and 30 is a connection terminal of the element holder.

The infrared detection device 11 configured in this manner is first installed on the ceiling or wall surface of a room or the like corresponding to a specific location such as a passageway to be detected. Next, power is input to this device 11 to cause the LED 15.15 corresponding to the infrared detection area 26.26 to emit light, and while visualizing the emitted visible light projection area 25°25, the overall angle of the condensing mirror 12 is determined. After adjusting the angle of the condensing mirror 12 to the corresponding position and direction to be detected through the adjustment and optical axis adjustment mechanism, by turning off the LFD 15.15, the infrared detection device 11 can perform the desired detection. The position and detection direction are initialized.

When, for example, a person enters this infrared detection area 26.26, the infrared rays emitted from the human body are collected by the condenser mirror 12
The infrared pyroelectric element 13 detects this via the infrared pyroelectric element 13, and appropriate measures, such as alarm means, are taken based on this detection signal.

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

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic explanatory diagram of an infrared detection device, FIG. 2 is an enlarged perspective view of the main parts of the infrared detection device, and FIG. 3 is a longitudinal cross-sectional side view of the main parts of the infrared detection device. It is. 11... Infrared detection area @ 12... Condensing mirror 13
...Infrared pyroelectric element 14...Element holder 15...
・LED 16...Filter 19...
Concave mirror 21... Infrared detection element 211...
・Transmission window 25...Visible light projection area 26...
・Infrared detection area

Claims (1)

[Claims] 1. A condensing mirror that receives multiple optical axes; Corresponding to the focal point of the condensing mirror, the infrared light Dual-element built-in red type with detection elements installed in parallel an external pyroelectric element, Arranged between the parallel opposing parts of the infrared pyroelectric element a visible light source emitter, The visible light of the light emitter is transmitted to the pyroelectric element. Positioning and projection in correspondence with the infrared detection area The emission window is provided with a transmission window that allows transmission as much as possible. Equipped with a filter installed opposite to the front of the light body. Ta Infrared detection device.