JPS60224028A - Infrared-ray detector - Google Patents

Abstract

PURPOSE:To make an establishing work of a detecting range easy by providing a mechanism for changing a light emitting member of a lighting position close to an infrared-ray detecting element and to the position outside a visual field of a condenser mirror and by using the engaging member and an element staring case to serve as a contact of a lighting switch. CONSTITUTION:When a mobile frame 24 is operated for rotation by an operating lever 27 and a light emitting member 18 is held at a lighting position by engaging an engaging member 31 with an element storing case 20, the luminous member 18 is enlarged and projected to the condition of nearly focusing to a condenser mirror 2 and coincides with the detecting range of an infrared-ray detecting element 3. The inclination of light axis of the mirror 2 is also adjusted with visualizing the light emitting member projected. Then with lighting-off by reverse operation of the lever 27 and by removal of the engaging member 31 from the peripheral face of the case 20, the mobile frame 24 is rotated and displaced with a tensile spring 29 and the light emitting member 18 is returned to a lighting off position and a work for establishment of visual range of the mirror 2 is completed. Further a mask cover (figure omitted) is covered on a main body 1 of detector after the completion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an infrared detector installed on a ceiling or wall in a room and used to detect a subject such as a human body moving in the vicinity.

Prior Art and its Problems In general, this type of infrared detector is equipped with a condensing mirror and an infrared detection element placed at the focal point of the condensing mirror, and detects a human body, etc. within the field of view of the condensing mirror. It is known that the infrared rays emitted from the subject are detected by an infrared detection element, and the presence or absence of the subject is detected based on the amount of change in the infrared rays. In such an infrared detector, it is necessary to position the condensing mirror in the optimal direction for detecting the object depending on the installation location, so the condensing mirror must be angularly displaced relative to the detector body. It is possible to install it and adjust the tilt angle of its optical axis.

By the way, infrared rays cannot be seen, so when setting the viewing direction of the condensing mirror, that is, the detection area of the infrared detection element, conventionally the detector is set in an operating state where it can be detected, and the infrared detection element is actually set. I was checking to see if it was being detected.

For this reason, when detecting a human body, for example, the person performing the setup work moves around the infrared detector, checking the operation of the detector each time, and adjusting the direction of the field of view of the condensing mirror. The work is complicated and requires time and effort. Furthermore, if this adjustment is inaccurate, there is a risk that ambient light such as indoor incandescent lights or heat sources such as heating equipment may enter the field of view of the condensing mirror, causing the detection element to malfunction unexpectedly. The conventional detector described above has a problem in that the detection area of the infrared detection element cannot necessarily be set accurately. In this regard, in the case of a collector mirror with multiple concave mirrors, it is almost impossible to accurately track the field of view of each concave mirror.

In order to solve this problem, a light emitting member made of a light emitting diode or the like is prepared, and when setting the field of view of the condensing mirror, this light emitting member is attached so as to extend near the infrared detection element. It is effective to set the visible range of the condensing mirror by projecting it onto the condensing mirror and visually recognizing the projected image, since the detection area can be adjusted accurately. However, in this case, the light-emitting member must be lit when setting the field of view of the condensing mirror, but after adjustment, it is possible to eliminate the waste of power required to light the light-emitting member, and to reduce the power consumption of the infrared detection element due to the lighting. In order to eliminate the influence on the detection operation, it is necessary to turn off the light emitting member. However, if a lighting circuit device for a light emitting member such as a slide switch is installed separately near the infrared detection element, the structure of the detector will inevitably become complicated, the number of parts will increase, and the assembly process will also become complicated. This results in an increase in factors that increase manufacturing costs.

<Object of the Invention> The present invention has been made in view of the above-mentioned problems in the prior art, and makes it possible to easily and accurately set the detection area of an infrared detection element, and also to eliminate the need to turn on the light emitting member when unnecessary, thereby reducing the cost. The aim is to provide high-performance infrared detectors.

<Configuration and Effects of the Invention> For this purpose, the present invention provides a condensing mirror, an infrared detection element disposed at the focal point of the condensing mirror, and a light emitting member for visually recognizing the field of view of the condensing mirror from the outside. and a position switching mechanism for installing the light emitting member so that it can move forward and backward between two positions: a lighting position near the infrared detecting element and a position outside the field of view of the condensing mirror, and the infrared detecting element is installed in an element storage case. The position switching mechanism further includes an engaging member that embraces the element storage case in the operating position, and the engaging member and the element storage case each serve as a contact point for a lighting switch of the light emitting element. Therefore, when adjusting the field of view of the condensing mirror, the operator should observe the visible limit of the light-emitting member projected on the condensing mirror, and then determine that this observable area is the detection area of the infrared detection element. Therefore, the detection area can be set very easily. In addition, when the light-emitting member is set near the infrared detection element, the lighting switch conducts only to the outside and lights the light-emitting member, which completely eliminates power wastage. The influence on the operation of the element can be eliminated. Furthermore, since the housing case for the infrared detection element and the engaging member of the position switching mechanism are also used as contacts for the lighting switch, there is no need to assemble the lighting circuit device for the light emitting member when assembling the mechanical parts of the product. Become. Therefore, the assembly process of the product can be simplified accordingly, and manufacturing costs can be reduced.

<Description of Examples> Hereinafter, the present invention will be described in detail based on examples shown in the drawings.

1 and 2 show the infrared detector of this embodiment, and in these figures, this infrared detector A
has a detector body 1, a condenser mirror 2 assembled in the detector body 1, and an infrared detection element 3 that receives reflected light from the condenser mirror 2 and detects a subject such as a human body. .

The detector main body 1 is made of plastic and consists of a large diameter cylindrical case with a shallow bottom, and a mounting fixture 5 that is bayonet connected to the bottom wall 4.
It is installed and fixed to the indoor ceiling or wall via the The upper end opening 6 of the detector main body 1 is normally covered with a mask cover 7 except when adjusting the optical axis of the condensing mirror 2. This mask cover 7 is a milky-white translucent cover that blocks visible light and transmits only infrared rays, and is fixed to the detector main body 1 with screws when in use.

The condensing mirror 2 includes a mirror main body 8 and a plastic holding frame 9 that holds the mirror main body 8 so as to be rotatable in the width direction.
Equipped with. The holding frame 9 has a pocket 10 into which the mirror main body 8 is fitted and fixed, and the detector main body 1
It is rotatably supported by a support frame 12 vertically erected from the bottom wall 4 of the holder so as to be angularly displaceable. The mirror main body 8 consists of a mirror part 13 that reflects and projects the subject onto the infrared detecting element 3, and an infrared detecting element accommodating part 15 connected to the mirror part 13 via a support frame 14. The mirror part 13 is made of a plastic base material with chrome plating applied to almost the entire surface, and includes a plurality of (six sides in this embodiment) concave mirrors 13a, 13.
It is composed of a...

These concave mirrors 13a, 13a, . . . are arranged so that their respective focal points are concentrated at one point within the infrared detecting element accommodating portion 15, and the infrared detecting element 3 is arranged and fixed at this focal point. This condensing mirror 2 is connected to each concave mirror 13a by an optical axis adjustment mechanism 16 interposed between this condensing mirror 2 and the detector main body 1.
, 13a are adjusted.

In FIGS. 3 to 5, the infrared detection element housing section 1
Reference numeral 5 includes a rectangular parallelepiped housing case 17, a light emitting member 18, and a position switching mechanism 19 for the light emitting member 18. The infrared detecting element 3 is housed in a conductive cylindrical metal element housing case 2o, and is placed in the center of the housing case 17 together with the element housing element housing case 2o. The housing case 17 has a first printed circuit board 21 that electrically processes the detection signal sent from the infrared detection element 3.
An infrared detecting element 3 is connected to the back side of the first printed circuit board 21. Note that a ground terminal (not shown) of the infrared detecting element 3 is connected to the ground side of the first printed circuit board 21 via the element storage case 2o.

The storage case 17 is a rectangular tube made of bent sheet metal arranged between the left and right side walls of the support frame 14, and as shown in FIG. The portion facing the detection surface 3a of No. 3 and the side surface facing the outside of the detector body 1 are transparent. Position switching mechanism 1
9 includes a movable frame 24 made of plastic. The movable frame 24 has arm portions 26.26 extending from both ends of the frame body 25, and has an operating lever 27 connected to one arm portion 26, and is attached to a support shaft 28 erected on the storage case 17. It is rotatably mounted, and is biased in one direction within the housing case 17 by a tension spring 29 suspended between the frame body 25 and the housing case 17. Further, the operating lever 27 is exposed to the outside through the operating window 23. An engaging member 31 that embraces and engages the outer peripheral surface of the storage element storage case 20 is integrally mounted and fixed in the recessed portion 30 between both arm portions 26 and 26 of the movable frame 24. This engagement member 31 is made of a circularly curved metal plate spring piece,
It is electrically connected to a metal hooking piece 32 on which the tension spring 29 is hooked.

The light emitting member 18 is provided to visually confirm the field of view of the condensing mirror 2 from the outside, and in order to facilitate the confirmation work, a light emitting element such as an LED,
Consists of a visible light source such as a lamp, with 3 lead terminals on the left and right.
3.33 is pulled out, and each lead terminal 33 is connected by soldering to a second printed circuit board 34 provided on the surface of the movable frame 24, thereby being suspended in the center of the recessed portion 30. According to the operation of the position switching mechanism 19, this light emitting member 18 is moved between the condensing mirror 2 and the infrared detection element 3 to an advanced position (lighting position 1f) F where it overlaps with the detection surface 3a of the infrared detection element 3, and to the condensing mirror Move forward and backward in moderation between the exit position (lights out position) B and the exit position (lights out position) outside the field of view of No.
Power is supplied and lights up only in the retracted position, and power is cut off in the retracted position. That is, the element housing case 20 and the engaging member 31 each constitute a contact point of the lighting switch 35 of the light emitting member 18, and in the lighting position F, the engaging member 31 is engaged with the element housing case 20. At the same time, the lighting switch 35 is turned on, and the power supply current flows from the power electrode of the second printed circuit board 34 through the light emitting member 18, the ground line on the second printed circuit board 34, and the hooking piece 32, and reaches the engaging member 31. , flows to the ground side of the first printed circuit board 21 via the lighting switch 35. Furthermore, when the operating lever 27 is operated to disengage the engagement member 31 and the element storage case 20, the lighting switch 35 is turned off, so the light emitting member 18 is inevitably turned off.

Now, in order to install the infrared detector A with the above configuration on the ceiling or wall surface of a room, it is first necessary to match the preset detection area with the field of view of the condensing mirror 2, that is, the detection area of the infrared detection element 3. be. Therefore, as shown in FIG. 5, the movable frame 24 is rotated using the operating lever 27.
After engaging the engaging member 31 with the housing element storage case 20 and turning on the lighting switch 35, the light emitting member 18 is held at the lighting position F. In this case, the light emitting member 1
8 is located at a position overlapping the detection surface 3a of the infrared detection element 3, and is enlarged and projected while being almost focused on the condensing mirror 2. Therefore, the range where the light beam emitted from the light emitting member 18 passes through the condensing mirror 2 and is visually recognized is the condensing mirror 2.
, that is, the detection area of the infrared detection element 3. Next, while visually checking the light emitting member 18 projected onto the focusing mirror 2, the inclination angle of the optical axis of the focusing mirror 2 is adjusted. This outside-of-area angle adjustment operation is performed using the Mira body 8.
This is done by rotating the optical axis adjustment knob and angularly displacing the condensing mirror 2 so that the subject is within the field of view. The angle of the condensing mirror 2 in the width direction is adjusted by rotating the mirror body 8 within the holding frame 9. When the optical axis adjustment operation is completed in this way, the operation lever 27 is rotated slightly in the opposite direction again to disengage the engagement member 31 from the outer peripheral surface of the element storage case 20. When the lighting switch 35 is turned off, the movable frame 24 is rotationally displaced by the tension spring 29, and the light emitting member 1 is turned off.
8 is returned to the light-off position B, and the work of setting the field of view of the condensing mirror 2 is completed. After this is completed, the detector main body 1 is covered with a mask cover 7 so that visible light does not enter the infrared detecting element 3.

Note that the light-emitting member 18 is not limited to a light-emitting element such as an LED, and may be a miniature light bulb or the like as long as it serves as a visible light source.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, in which FIG. 1 is a partially cutaway perspective view showing a state with the mask cover removed, FIG. 2 is a central vertical front view, and FIG. ■−■ in the diagram
4 is a partially cutaway plan view of the main part, and FIG. 5 is a front view of the main part showing a state in which the engaging member is engaged with the element storage case. 2 is a condensing mirror, 3 is an infrared detection element, 18 is a light emitting member, 19 is a position switching mechanism, 20 is an element storage case, 31 is an engaging member, 35 is a lighting switch, A is an infrared detector, B
is the off position and F is the on position.

Claims (2)

[Claims] (1) A condensing mirror, an infrared detection element placed at the focal point of the condensing mirror, a light emitting member for visually confirming the field of view of the condensing mirror from the outside, and a light emitting member placed near the infrared detection element. and a position switching mechanism installed movably between two positions: a position and a position outside the field of view of the condensing mirror, the infrared detecting element includes an element storage case, and the position switching mechanism An infrared detector comprising a retaining member that holds an element storage case, and the engaging member and the element storage case each serve as a contact point for a lighting switch of a light emitting element. (2) The infrared detector according to claim 1, wherein the light emitting member is a light emitting element such as an LED.