JPH01217818A - Human body detecting switch - Google Patents

Abstract

PURPOSE:To reduce the occupying space of a sensitivity control member by providing a specific sensitivity control member, and controlling the light receiving amount when the light receiving amount detected by a light receiving element is a specific value or more. CONSTITUTION:The peripheral light is injected from a light receiving hole 26 to a photoelectric element PD. When the receiving light amount of the photoelectric element PD is made larger, the contact in a power source circuit is turned off, and the generation of the contact output is stopped. And when a focus element P detects a human body in the area, the contact is turned on, and a contact output is generated to feed a DC power source to a process circuit, to operate the photoelectric element PD. Furthermore, a sensitivity control member is furnished at the position responding to the light receiving hole 26 and controls the light receiving amount of the light receiving element PD optically. The sensitivity control member is a throttle plate furnishing a light permeable part at the center of the light shielding part or a colored light reduction plate. By preparing plural different kinds of throttle plates or light reduction plates, and changing them as occasion calls, the light receiving amount of the light receiving element PD can be controlled. Said throttle plate or light reduction plate has a small thickness and the occupying space of the sensitivity control member can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a heat ray sensor, and when there is an intruder within the detection area of the heat ray sensor, j! This invention relates to a human body detection switch that can provide Ilc voltage or voltage contact output.

[Prior Art] This type of human body detection switch is generally used, for example, to automatically turn on a 5-volt light or automatically operate a ventilation fan when a person enters the restroom. . By the way, during the daytime when there is a lot of ambient light, there is no need to turn on the lights directly, so it is desirable to stop the operation. For this reason, it has been considered to provide a light receiving element that detects the amount of ambient light and to control the operation based on the output of this light receiving element. in this case,'
The sensitivity of the light receiving element can be adjusted to 111Iff depending on the location of use! A variable resistor is generally used for this sensitivity adjustment.

[Problems to be Solved by the Invention] When a variable resistor is used to adjust the sensitivity of a light-receiving element, there is a problem that the variable resistor occupies a large amount of the internal space of the case, making the case larger. However, there is a problem in that the cost is also high.

The present invention aims to solve the above-mentioned problems, and provides a human body detection switch that allows sensitivity adjustment of a light receiving element to be performed in a smaller space and at a lower cost than a variable resistor. This is what I am trying to do.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a sensitivity adjustment member that optically limits the amount of received light in front of the light receiving surface of the light receiving element.

The sensitivity adjustment member may be a diaphragm plate that has a light-shielding part that covers at least a part of the light-receiving surface of the light-receiving element, and has a light-transmitting part formed in an appropriate position of the light-shielding part to obtain a predetermined amount of transmission, or a light-receiving element of the light-receiving element. It is desirable to use a light-reducing plate that covers at least a portion of the surface and is set to a predetermined amount of transmission.

[Operation J] According to the above configuration, since the amount of received light is optically limited, the space occupied by the sensitivity adjustment member can be reduced compared to the case where a variable resistor is used, and the cost can also be reduced. .

[Example] As shown in Figs. 1 to 3, the case 1 is formed by combining a body 10 made of a synthetic resin molded product and a cover 20, and has the same size as the wiring device specified in the JIS standard. Square 3
It has dimensions equivalent to an individual module, and the mounting part is formed so that it can be mounted on a metal mounting frame or a synthetic (fat) mounting frame specified by the industry association standards of the Wiring Equipment Industry Association. The mounting frame is designed to be attached to an embedded box such as a switch box.The mounting part is attached to the cover 20.
The cover 20 is connected to the metal mounting frame by inserting protrusions of the metal mounting frame into locking holes 21, which are formed in pairs on both left and right sides of the cover 20. For a synthetic resin mounting frame, four locking claws 22 protruding from each side edge of the cover 20 are inserted into the holding holes formed in the synthetic resin mounting frame. be combined. Seven tabs 23 are protruded from each of the left and right edges and the rear edge of the lower surface of the cover 20, and the seven tabs 23 fit into the fitting holes 11 formed in the peripheral wall of the body 10 inside the peripheral wall of the body 10. The body 10 and the cover 20 are then fitted together.

The interior of the body 10 is divided into a circuit storage chamber 13 and a pair of terminal storage chambers 14 by a partition 12, and a pair of holding ribs 15 are provided on the inner peripheral surfaces of the left and right side walls of the circuit storage chamber 13.
is provided protrudingly, and a rotation frame support plate 16 is provided in the groove between the holding lips 15.
Both left and right ends are held. The rotating frame support plate 16 is formed into a substantially T-shape with the left and right intermediate portions projecting upward, and a stepped portion 16b is formed on the side edge of the vertical piece. A rotation frame support lip 17 is formed on the inner circumferential portion of the rear wall of the body 10, facing the rotation frame support plate 16. Rotating frame support plate 1
6 and the upper surfaces of the rotating frame support ribs 17 are respectively arc-shaped rotating surfaces 16a with concave central portions.

17a, and the rotating frame 30 is rotatably supported between the upper surfaces of the rotating frame support plate 16 and the rotating frame support lip 17. A first printed circuit board 40 on which a power supply circuit section is mounted is mounted inside the body 10.

The rotating surface 16 of the rotating frame support plate 16 is mounted on the printed circuit board 40.
Notches 41a and 41b are respectively formed to expose the rotational surface 17a of the rotating frame support rib 17. This printed circuit board 40 includes a partition block 12, a rotation frame support plate 16,
A space is formed between the inner bottom surface of the body 10 and the printed circuit board 40, and the circuit components mounted on the printed circuit board 40 are placed in this space. It is now possible to do so. In particular, the main circuit components on the printed circuit board 40 will be stored in a portion corresponding to the circuit storage chamber 13. Further, a boss 18 is provided in the circuit storage chamber 13 to protrude from the inner bottom surface of the body 10, and a second printed circuit board 42 is held by a fixing screw 19 that is screwed into the boss 18. A fixing notch 43 into which the fixing screw 19 is inserted is formed at the periphery of the printed circuit board 42, and a variable resistor VR equipped with a slidable handle 72 is mounted on the printed circuit board 42. 1st above
A notch 41c from which the handle 72 of the variable resistor VR projects is formed at the periphery of the printed circuit board 40.

Terminals 50 are stored in the terminal storage chamber 14. The terminal 50 includes a terminal board 51, a locking spring 52 having a spring force directed toward the terminal board 51, and a release button 53 capable of suppressing the locking spring 52 against the spring force. It has a well-known structure. A pair of terminal boards 5 are placed in one terminal storage chamber 14.
A locking spring 52 and a pair of locking springs 52 are delivered, and the release button 5
3 is J′ for both locking springs 52! It is arranged so that A wire insertion hole (not shown) is formed in the bottom wall of the body 10 in correspondence with each lock spring 52, and a release button 5
3 is exposed so that the release button 53 can be pressed against the spring force of the locking spring 52 using a jig such as a screwdriver. Here, the terminal 50 has a diameter of 1 for general residential wiring.
, 6, or 2.0 copper wire can be connected. A connecting piece 54 is provided at one place of the terminal board 51 to protrude upward, and this connecting piece 54 is soldered and fixed to the printed circuit board 40, thereby connecting the terminal 50 and the printed circuit board 40.
Electrically connected to the circuit section above! & will be done.

The rotating frame 30 is formed in a frame shape in which a pair of rotating plates 31a and 31b, which are formed in a disc shape and face each other at a distance from each other, are connected by a pair of mutually parallel side frames 32, and is used as a pyroelectric sensor as a heat ray sensor. The third device mounted with element P and its peripheral circuit section
A printed circuit board 44 is mounted. Rotating plates 31a, 31
b is placed on the rotating surfaces 17a and 16a,
The rotating frame 30 is designed to be able to rotate relative to the body 10. A fixing notch 45 is formed on one side of the printed circuit board 44, and a fixing protrusion 46 is provided in a protruding manner on one side opposite to the negative side. One rotating plate 31a of the rotating frame 30 is formed with a boss 33 corresponding to the fixing notch 31a along the inner surface, and the other rotating plate 31b is formed with a boss 33 corresponding to the fixing notch 31a.
A support hole 34 into which a fixing protrusion 46 fits is formed in the support hole 34 . Therefore, by fitting the fixing protrusion 46 into the support hole 34 and screwing the fixing screw 35 made of a tapping screw into the boss 33 through the fixing notch 45, the printed circuit board 44 is fixed to the rotating frame 30. It will be done. A handle 36 that is operated when adjusting the angle of the rotating frame 30 with respect to the body 10 is provided protruding from the circumferential surface of one rotating plate 31a. Furthermore, stoppers 37a and 37b that restrict the rotation range of the rotation frame 30 by coming into contact with the inner peripheral surface of the cover 20 are provided on the outer surfaces of the two rotary plates 31a and 31b, respectively.

The printed circuit boards 40, 42, and 44 described above are connected to each other via jumper #I47. First printed circuit board 40 and second printed circuit board 4 in body 10
A jumper wire 47 connecting the third printed circuit board 44 in the rotating frame 30 is inserted into a notch 41a formed in the printed circuit board 40. Also, a printed circuit board 44 inside the rotating frame 30 and another printed circuit board 40.
The jumper Ia 47 that connects 42 is set to have a margin greater than the rotatable length of the rotary frame 30 so that it will not be disconnected when the rotary frame 30 rotates.

An insulating sheet 48 is disposed on the upper surface of the printed circuit board 40 to prevent short circuits with the circuit section of the printed circuit board 44.

By the way, the pyroelectric element P mounted on the printed circuit board 44 is arranged between the both side frames 32 so that the upper surface side in FIG. ,
A lens plate 60 for setting a detection area is provided. The lens plate 60 is a flat 7-lens lens made of a material that transmits far infrared rays, such as high-density polyethylene, and is formed in a rectangular shape, with a pair of engagement 7 hooks 61 protruding from each side edge. Ru. This lens plate 60 has the peripheral portion of the lens plate 60 placed on a support rib 39 formed along the peripheral edges of the rotating plates 31a and 31b of the rotating frame 30, and
By engaging the engagement seven hooks 61 with the engagement recesses 38 formed in the lower part of the inner circumferential surface of the side frames 32 of the rotation frame 30, the rotation frame 30 is held in a semi-cylindrical shape. It has become so.

The lens plate 60 is composed of a plurality of regions to form a desired detection area. The focal point of each region is the pyroelectric element P
Of course, it is set on the detection surface of

On the upper surface of the cover 20, there are rotating plates 31a and 3 of the rotating frame 30.
A pair of rotating frame holding plates 24a, 2 that respectively hold 1b.
4b is provided protrudingly. Rotating frame holding plate 24a.

24b each has a peripheral wall, and rotating plates 31a and 31b rotate along the inner peripheral surface of the peripheral wall. That is, the rotating plate 31
a, 31b are rotating frame holding plates 24a, 24. b, the inner circumferential surface of the peripheral wall, the rotating frame support plate 16, and the rotating frame holding rib 1.
It rotates while being held between the rotating surfaces 16a and 17a of No.7. As described above, the rotation range of the rotation frame 30 is regulated by the stoppers 37a+37b coming into contact with the inner peripheral surface of the cover 20, and the range is set to approximately 40' in the left and right directions. Here, since the detection area with the rotation frame 30 fixed is set to approximately 90 degrees, the detection area can be adjusted within a range of 170 degrees by rotating the rotation frame 30. be.

On the front surface of the cover 20, in a part different from the rotating frame holding plates 24a and 24b, there is a handle insertion hole 25 through which a handle 71 for fabricating a switch SW, which will be described later, is exposed, and a light receiving element PD.
A light-receiving hole 26 through which a light-receiving hole 26 is exposed, and a display hole 27 through which a display element LD made of a light-emitting diode is exposed are formed. /
A nameplate 28 is disposed at a portion spanning the needle insertion hole 25, the light receiving hole 26, and the display hole 27. Here, the nameplate 28 is
A transparent hole 28a is provided at a portion corresponding to the handle insertion hole 25, and transparent portions 28b and 28c are provided at portions corresponding to the light receiving hole 26 and the display hole 27, respectively. A handle exposure hole 29 is formed in the center of one side of the cover 20, through which the handle 72 of the variable resistor VR is exposed. This part is covered by the flush plate when the case 1 is mounted on the mounting frame and the JIS standard 7 lash plate is placed on the front side of the case 1, and is a part that is covered by the flush plate when the case 1 is mounted on the mounting frame. This is to prevent you from accidentally touching it.

In the cover 20, a lens cover 64 made of a synthetic resin molded product transparent to far infrared rays is attached between the rotating frame holding plates 24a and 24b. The lens cover 64 is formed in a semicylindrical shape, and a pair of locking pieces 65 are protruded from both side edges thereof. As shown in FIG. 3, this locking piece 65 is locked to the inner peripheral surface of the cover 20, and the lens cover
4 is fixed to the cover 20. The lens cover 64 is arranged so as to be in substantially close contact with the outer surface of the lens plate 60. Since the lens cover 62 only needs to transmit infrared rays, it can be made of a material that is opaque to visible rays.
By covering the rotation frame 30 with the rotation frame 30, the circuit section inside the rotation frame 30 is not visible from the outside, and the user can be prevented from feeling psychologically anxious.

The circuit section is configured as shown in FIG.

The four terminals 50 described above each constitute an input terminal of a commercial power source and an output terminal in which a contact r of a relay Ry is inserted between the commercial power source and the input terminal. Commercial l! The power source is rectified and smoothed by a power supply circuit 81 and stabilized by a constant voltage circuit 82. The DC power thus obtained is supplied to the processing circuit IC to which the pyroelectric element P is connected. The processing circuit IC is, for example, C
It is constructed by externally attaching peripheral components to an integrated circuit commercially available under a name such as F1651C, and when infrared rays emitted from the human body are detected by the pyroelectric element P, the output level of the output terminal OUT remains ``H'' for a certain period of time. “It's structured like this. This time can be changed by adjusting the variable resistor VR. This adjustment range is set, for example, from about 10 seconds to about 6 minutes. Furthermore, a light receiving element P made of CdS is connected to the enable terminal EN^.
D is connected, and the processing circuit IC is set to stop operating when the amount of light received by the light receiving element PD increases. The output terminal OUT of the processing circuit IC is connected to the switch S.
It is connected to the relay control circuit 83 via W. The relay control circuit 83 has a series circuit of a switching element Q made of a transistor, a relay coil L, and a display element LD made of a light emitting diode connected to the power supply circuit 81, and the control terminal of the switching element Q is set to H''. During this period, the contact r of the relay Ry closes, and the display element LD lights up.

The switch SW is a three-contact slide switch,
The state in which the control terminal of the relay control circuit 83 is set to either "H" or L, and the output terminal 0tlT of the processing circuit IC
It is possible to select from three states: the state where it is connected to the Therefore, operate the switch SW? If the non-control circuit 830 system # terminal is manually set to either "H" or L, the contact "will be in either the on or off state accordingly. Also, the control terminal of the relay control circuit 83 If you select the state where it is connected to the output terminal 0 (IT) of the processing circuit IC, when a human body is detected by the pyroelectric element P,
Contact r is turned on for a certain period of time.

Here, the power supply circuit 81, constant voltage circuit 82, relay control circuit 83, switch SW, and light receiving element PD are mounted on the first printed circuit board 40, and the variable resistor VR and capacitor C are mounted on the second printed circuit board. 42, and the processing circuit IC is mounted on the third printed circuit board 44.

By the way, in a portion corresponding to the light receiving hole 26, as shown in FIG. 5, a diaphragm plate 75 is arranged, which has a local portion serving as a light shielding portion 75a and a central portion having a suitably large transparent portion 75b. . The aperture plate 75 is made of a thin resin sheet or the like, and is attached to the nameplate 28 with an adhesive applied to the aperture plate 75. If such a diaphragm plate 75 is used, the transparent part 75
Since the amount of light transmitted to the light receiving element PD can be adjusted according to the size of &, a plurality of aperture plates 75 with different sizes of light-transmitting portions 75b are prepared and used by replacing them depending on the place of use. By doing so, the sensitivity of the light receiving element PD can be adjusted. In place of the aperture plate 75, a light attenuation plate may be used to adjust the sensitivity of the light receiving element PD. The light-reducing plate covers at least a portion of the light-receiving surface of the light-receiving element PD, and is colored so as to attenuate transmitted light. Therefore, if a plurality of types of light attenuating plates with different amounts of transmitted light are prepared and replaced depending on the place of use, the sensitivity of the light receiving element PD can be adjusted in the same way as the aperture plate 75. Since these aperture plate 75 and light attenuation plate are thin and are simply attached to the name plate 28, they occupy less space and are lower in cost than conventional variable resistors.

[Effects of the Invention] As described above, the present invention has a sensitivity adjustment member that optically limits the amount of light received in front of the light receiving surface of the light receiving element, so compared to the case where a variable resistor is used. The space occupied by the sensitivity adjusting member required for adjusting the sensitivity of the light receiving element is reduced, and the sensitivity can be adjusted at low cost. In particular, it has a light shielding part that covers at least a part of the light receiving surface of the light receiving element,
It is recommended to use a diaphragm plate in which a light-transmitting part is formed to obtain a predetermined amount of transmission at an appropriate place in the light-shielding part, or a light-reducing plate that covers at least a part of the light-receiving surface of the light-receiving element and is set to a predetermined amount of transmission. For example, the diaphragm plate and the attenuation plate can be formed thin, which meets the objectives of miniaturization and low cost.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are exploded perspective views showing one embodiment of the present invention, Figure 2 is a vertical sectional view of the same, Figure 3 is a cross sectional view of the same, and Figure 4 is a circuit used in the same. FIG. 5 is a front view showing an example of a diaphragm plate used in the same. DESCRIPTION OF SYMBOLS 1... Case, 75... Crest plate, 75a... Light-shielding part, 75b... Light-transmitting part, P... Pyroelectric element, PD...
·Light receiving element. Agent Patent Attorney Ishi 1) Chief 7 Figure 2 Figure 3

Claims (3)

[Claims] (1) A human body detection switch that has a heat ray sensor inside the case and generates a contact output when an intruder is detected within the detection area of the heat ray sensor formed in front of the case, detects the amount of surrounding light and A light-receiving element that stops generation of contact output when the amount of light exceeds a predetermined amount is provided, and a sensitivity adjustment member that optically limits the amount of received light is disposed in front of the light-receiving surface of the light-receiving element. Human body detection switch. (2) The sensitivity adjustment member is a diaphragm plate that has a light-shielding portion that covers at least a portion of the light-receiving surface of the light-receiving element, and a light-transmitting portion that allows a predetermined amount of transmission to be formed at an appropriate location in the light-shielding portion. The human body detection switch according to claim 1. (3) The human body detection switch according to claim 1, wherein the sensitivity adjustment member is a light-reducing plate that covers at least a portion of the light-receiving surface of the light-receiving element and is set to a predetermined amount of transmission.