JP4337781B2 - Hot wire type human sensor device - Google Patents

Description

  The present invention includes an apparatus main body having a heat ray sensor having a heat ray sensor that receives heat rays emitted from a human body existing in a preset detection region through a lens exposed from the housing, and has a light shielding property against heat rays. The present invention relates to a hot-wire human sensor device capable of narrowing a detection region by attaching a lens to a device main body so as to cover a part of a lens.

  This type of hot-wire human sensor device (hereinafter simply referred to as “sensor device”) is generally used in a state where the device main body is attached to a construction surface such as a ceiling surface. It is used to detect the presence or absence of a human body in a conical detection area set to the front side when the main body is attached to the ceiling surface. The area restriction hood is used to narrow the detection area according to the purpose of use of the sensor device (see, for example, Patent Document 1).

  As shown in FIG. 11, the region-restricting hood 1 that is widely used is formed in a dome shape that protrudes forward (downward in the figure), and has a circular lens window 68 penetrating through the front end. There are many. A pair of attachment pieces 54 protrudes rearward from the outer peripheral edge of the area restriction hood 1, and an attachment claw 55 provided at the tip of the attachment piece 54 is provided in the apparatus main body A (see FIG. 3). The region limiting hood 1 is detachably attached to the apparatus main body A by engaging with the attachment hole 56.

  FIG. 12 shows a detection region E set on the floor surface immediately below the sensor device with the sensor device mounted on the ceiling surface, and the larger circle detects the state where the region restriction hood 1 is not attached. The region E is represented, and the smaller circle represents the detection region E in a state where the region restriction hood 1 is attached. That is, on the floor surface, by attaching the area limiting hood 1, the detection area E is narrowed by the shaded portion in the figure.

  Incidentally, in the sensor device described above, the lens window 68 is formed in a circular shape in order to make the shape of the detection region E in a state where the region restriction hood 1 is attached irrespective of the orientation of the device main body A with respect to the construction surface. However, since the shape of the detection region E cannot be changed from a conical shape even if the region restriction hood 1 is attached, the degree of freedom of the shape of the detection region E is low.

On the other hand, in Patent Document 1, in the area limiting hood 1, the periphery of the circular lens window 68 is divided into a plurality of light shielding members in the circumferential direction of the lens window 68, and each light shielding member can be individually attached and detached. Thus, it is described that it is possible to set the detection region E having a higher degree of freedom of shape compared to the case where the region-limiting hood 1 of FIG. 11 in which only the circular lens window 68 is formed is attached. . In other words, when the area limiting hood 1 described in Patent Document 1 is used, the light shielding member is removed in the circumferential direction of the lens window 68 as compared with a state in which all the light shielding members are attached by removing some of the light shielding members. The detection area E can be expanded in the direction corresponding to the portion from which the mark is removed.
JP 2003-131290 A

  However, even in the area limiting hood 1 described in Patent Document 1, it is necessary to divide the periphery of the lens window 68 into a number of light shielding members in order to adjust the direction in which the detection area E is expanded. If a large number of light shielding members are formed as described above, there is a problem that the number of parts increases and the manufacturing cost is improved.

  The present invention has been made in view of the above-described reasons, and is capable of adjusting the direction of a detection region in a state where a region restriction hood is attached, and can be realized with a relatively small number of parts. The purpose is to provide.

According to the first aspect of the present invention, there is provided a device main body having a heat ray sensor in the housing for receiving heat rays radiated from a human body existing in a preset detection region through a lens exposed from the housing, and has a light shielding property against the heat rays. And an area restriction hood that is detachably attached to the apparatus main body and narrows the detection area by covering a part of the lens, and the area restriction hood has a circular opening and exposes the lens from the opening. A fixed frame that is detachably attached to one surface side of the apparatus main body , and a light shielding plate that is held by the fixed frame . The fixed frame is attached to the apparatus main body and intersects the one surface of the apparatus main body. gap is formed between the apparatus main body in, the light-shielding plate, holding the outside diameter is held between the large circle is formed annularly solid Teiwaku the apparatus body than the inner diameter of the opening If, have a light shielding portion disposed in the opening in the lens is formed integrally with the holding portion so as to cover a part of the circumferential direction of the opening, the holding part, the between the fixed frame and the apparatus body It is characterized by being held so as to be rotatable in the circumferential direction of the opening within the gap .

  According to this configuration, when the relative position of the holding portion and the fixed frame is changed in the circumferential direction of the opening, the portion covered with the light shielding portion in the lens changes along the circumferential direction of the opening. By adjusting the relative position of the holding part and the fixed frame, the direction of the detection region can be adjusted in the circumferential direction of the opening. Furthermore, since the area-restricting hood is configured with a relatively small number of parts, that is, two members of the fixed frame and the light shielding plate, there is an advantage that the cost required for the area-restricting hood can be reduced.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a separation groove is formed so as to surround the separation piece so that the light shielding portion is a separation piece that can be partially folded. To do.

  According to this configuration, by folding the separation piece, a portion of the lens covered with the separation piece can be exposed and the detection region can be expanded, so the degree of freedom of the shape of the detection region is improved. .

  According to a third aspect of the present invention, in the second aspect of the present invention, the separation groove is provided on two straight lines connecting the center of the opening provided in the fixed frame and the periphery of the opening in the light shielding portion. A side groove and a connecting groove for connecting ends opposite to the center of the opening in both side grooves along the peripheral edge of the opening, and the side groove is formed by forming a light shielding portion with a small thickness. The connecting groove is characterized in that the light shielding portion is cut out in the thickness direction.

  According to this configuration, since the light shielding portion is cut out in advance at the portion where the connecting groove is provided, when the separation piece is folded, it can be easily broken by simply cutting the portion provided with the side groove. In addition, while the separation piece can be easily folded in this way, the side groove mainly related to the shielding of the heat ray received by the heat ray sensor does not penetrate in the thickness direction of the light shielding portion. In the case of using the area-limiting hood without breaking off, erroneous detection due to the heat ray sensor receiving the heat rays in the area other than the detection area through the side groove does not occur.

  According to a fourth aspect of the present invention, in the first to third aspects of the invention, the light shielding plate is selected from a plurality of types in which the holding portion has the same shape and the shape of the light shielding portion is different. And

  According to this configuration, when setting the detection areas of various shapes using the area restriction hood, there is an advantage that only the light shielding plate needs to be replaced and the fixed frame can be shared.

  In the present invention, when the relative position of the holding portion and the fixed frame is changed in the circumferential direction of the opening, the portion of the lens covered by the light-shielding portion changes along the circumferential direction of the opening. By adjusting the relative position between the frame and the fixed frame, the direction of the detection region can be adjusted in the circumferential direction of the opening. Furthermore, since the area-restricting hood is configured with a relatively small number of parts, that is, two members of the fixed frame and the light shielding plate, there is an advantage that the cost required for the area-restricting hood can be reduced.

  In the present embodiment, as a heat ray type human sensor device (hereinafter simply referred to as “sensor device”), an apparatus main body A having a sensor (heat ray sensor) for detecting a change in the amount of heat rays radiated from a human body is provided. The automatic switch with a heat ray sensor which detects the presence or absence of the human body in the conical detection area | region set below the apparatus main body A by using in the state attached to the surface (not shown) is illustrated. The sensor device of the present embodiment is configured by attaching a region-limiting hood 1 having light shielding properties to the device main body A. Hereinafter, the configuration of the device main body A will be described first.

  As shown in FIG. 2, the housing 2 of the apparatus main body A is formed in a disc shape and is integrally formed so as to surround the window hole 3 on the upper surface of the flange part 4 and the flange part 4 with the window hole 3 penetrating through the center part. The body 6 having the cylindrical portion 5 is formed, and the cover 7 is formed in a box shape with a bottom opening and is coupled to the body 6 so as to cover the upper surface side of the cylindrical portion 5. Engagement pieces 9 each having an engagement hole 8 projecting from the upper end edge of the cylindrical portion 5 are projected, and an engagement claw 10 provided on the outer surface of the cover 7 is fitted into the engagement hole 8. Thus, the body 6 and the cover 7 are coupled.

  Fixing grooves 12 for fixing a pair of clamps 11 for attaching the housing 2 to the ceiling surface are formed on both sides of the cylinder portion 5 on the upper surface of the flange portion 4. The sandwiching metal 11 is inserted into a support column 14 which is formed in a vertically long box shape whose one surface along the longitudinal direction is open and has a fixing claw 13 which engages with the fixing groove 12 on the lower surface, and both upper and lower walls of the support column 14. Accordingly, the tightening screw 15 is rotatably held with respect to the support column 14, and the clamping piece 16 is screwed into the tightening screw 15. In FIG. 2, the clip piece 16 is accommodated in the notch 17 continuous with the opening of the support column 14 at the upper end portion of the support column 14, but moves to the opening of the support column 14 from the notch 17 by turning the tightening screw 15. And descend. Therefore, if the tightening screw 15 is turned in a state in which the metal fitting 11 and the cylinder part 5 are inserted into a construction hole penetrating through the ceiling board (not shown), the pinching piece 16 is lowered to the space between the flange part 4. By sandwiching the ceiling board, the housing 2 is attached to the ceiling surface.

  The housing 2 configured in this manner accommodates a lens block 20 provided with the sensor 18 and the lens 19, a pressing member 21 for pressing and holding the lens block 20, and a control system board 22 and a power system board 23 described later. Is done.

  The lens block 20 includes a cylindrical cylindrical body 24 and a lid body 25 having an opening on the lower surface combined from above the cylindrical body 24, and the sensor 18 is mounted in a space surrounded by the cylindrical body 24 and the lid body 25. The sensor substrate 26 and the lens 19 are accommodated. The lens 19 is formed in a dome shape that is convex downward, and has a flange portion 27 (see FIG. 1) that extends outward over the entire outer periphery of the lens 19, and an outer peripheral edge of the flange portion 27. A lens plate 29 is configured together with a cylindrical body portion 28 that extends upward over the entire circumference, and is held by the cylinder body 24 by fitting the body portion 28 into the cylinder body 24 from above. That is, the upper and lower end surfaces of the cylinder 24 are respectively closed by the lid 25 and the lens plate 29. The sensor substrate 26 is disposed between the lens plate 29 and the lid body 25.

  Here, a sensor 18 provided with a sensor element of a pyroelectric infrared sensor as the light receiving unit 30 (see FIG. 1) is used. This type of sensor 18 is a so-called differential sensor that outputs the rate of change of heat dose as a voltage signal. However, in this embodiment, only the human body that enters and exits the detection region is adopted in the lens 19 in the configuration described below. In addition, it is possible to detect a human body that stops in the detection area. That is, the lens 19 is formed by arranging a plurality of lens bodies 19a to 19c on a triple circle. Four lens bodies 19a are arranged on the circle on the center side of the lens 19, ten lens bodies 19b are arranged on the outer circle, and 16 lenses are arranged on the circle on the peripheral side. Small bodies 19c are arranged. And the sensor 18 is installed so that the four lens bodies 19a arranged in the center side of the lens 19 may be located just under the light-receiving part 30, and receives the heat ray which passed each lens body 19a-19c. . Here, the sensitivity variation is given to the sensor 18 by giving a change in the amount of light condensed to the sensor 18 for each of the lens bodies 19a to 19c. As a result, the presence or absence of the human body can be detected from the change rate of the heat dose for each small region set for each lens body 19a to 19c even within one detection region.

  Further, the lid body 25 of the lens block 20 is provided with a pair of shaft portions 31 that are each cylindrical and project on both sides. The lens block 20 can be swung around the shaft portion 31 in the window hole 3 by inserting the shaft portion 31 into a vertically long bearing groove 32 formed in the inner peripheral surface of the window hole 3 in the body 6. Will be placed. Furthermore, the shaft portion 31 also functions as a detent of the cylinder body 24 with respect to the lid body 25 by fitting into a positioning recess 33 formed at the upper end edge of the cylinder body 24.

  The pressing member 21 is made of a sheet metal and is installed in the window hole 3 of the body 6 so as to be fixed to the body 6 by a pair of fixing screws 34, and a spring 36 is provided at the center of the lower surface of the pressing metal 35 via a spring 36. And a contact piece 37 to be attached. The abutment piece 37 abuts on the upper end of the lens block 20 to press and hold the lens block 20 in the window hole 3 by spring elasticity, and when the lens block 20 swings, A frictional force is generated between the lens block 20 and the lens block 20 to hold it at an arbitrary angle. Thereby, the optical axis of the lens 19 and the sensor 18 can be adjusted to an arbitrary angle within a range in which the lens block 20 can swing. The upper surface of the lid 25 is formed to be a part of a spherical surface so that a constant pressing force is applied to the lens block 20 from the contact piece 37 even when the lens block 20 swings. It is desirable.

  On the other hand, the control system board 22 is connected to the sensor board 26 by lead wires 38 drawn from the lens block 20 and also to the power supply system board 23. The lead wire 38 is drawn out from the lens block 20 through a drawing hole 39 provided in the side wall of the lid 25. The extraction hole 39 also functions as a detent for the lens plate 29 with respect to the lid body 25 by fitting a positioning projection 40 provided at the upper edge of the lens plate 29.

  In the power supply system board 23, three sets of terminal portions 41 for connecting electric wires (not shown) are mounted on the upper surface side. Each set of terminal portions 41 is disposed between two terminal plates 42 mounted on the power supply system substrate 23 so as to face each other, and is disposed between both terminal plates 42 so as to penetrate the upper surface of the cover 7. From the two locking springs 44 for holding the wires inserted from the inserted wire insertion port 43 between the terminal plates 42 and the release hole 45 provided on the side of the wire insertion port 43 in the cover 7. A so-called quick connection terminal is configured by including one release button 46 that simultaneously presses both locking springs 44 to release the holding of the electric wire by inserting the leading end of a jig such as a minus driver. The control system board 22 and the power supply system board 23 are arranged between the cylindrical portion 5 of the body 6 and the cover 7 and above the lens block 20 in order of the control system board 22 and the power supply system board 23 from the bottom.

  Further, as shown in FIG. 3, a terminal cover 47 is detachably attached to the cover 7 so as to cover the wire insertion opening 43 and the release hole 45, and the lower surface of the flange portion 4 is attached to the body 6. A decorative plate 48 is detachably attached so as to cover. In the decorative plate 48, a through hole 49 is provided in a portion corresponding to the window hole 3 of the flange portion 4.

  In the sensor device having the above-described configuration, the lens 19 of the lens block 20 is exposed downward from the window hole 3, so that the detection region is set in a conical shape with the lens block 20 as the apex below the device body A. It will be. Further, since the lens block 20 can be swung within the window hole 3, the direction of the detection region viewed from the apparatus main body A can be adjusted within a range in which the lens block 20 can be swung.

  By the way, in the sensor apparatus of this embodiment, it is made of a synthetic resin material having a light shielding property against heat rays, and is detected by being detachably attached to the apparatus main body A having the above-described configuration so as to cover a part of the lens 19. The area-restricting hood 1 that narrows the area is characterized. Hereinafter, the configuration of the area restriction hood 1 will be described.

  As shown in FIG. 1, the area restriction hood 1 of the present embodiment is formed in an annular shape having a circular opening 50 that exposes substantially the entire lower surface of the lens 19 in the lens block 20, and is attached to and detached from the apparatus main body A. A fixed frame 51 that can be attached, and a light shielding plate 52 that is rotatably held in the circumferential direction of the opening 50 by being sandwiched between the fixed frame 51 and the apparatus main body A.

Specifically, the fixed frame 51 has a pair of mounting pieces 54 projecting upward from an annular frame 53 as shown in FIG. It is attached to the apparatus main body A by being fitted into an attachment hole 56 provided in the apparatus main body A. In the present embodiment, the mounting claws 55 are formed on the surfaces opposite to the surfaces facing each other in the thickness direction of the mounting pieces 54, and the mounting holes 56 are the inner peripheral surface of the cylindrical body 24 in the lens block 20. Thus, the fixed frame 51 is attached to the lens block 20. That is, even if the lens block 20 is swung, the fixed frame 51 also moves with the lens block 20 and the relative position between the lens block 20 and the fixed frame 51 does not change. Here, the fixed frame 51 is attached to the lens block 20 so that the frame 53 is positioned on the concentric circle of the flange portion 27 of the lens plate 29.

  Further, on the inner peripheral surface facing the opening 50 in the frame 53, a step 57 is formed over the entire circumference from the center in the vertical direction to the upper edge to widen the diameter of the opening 50. That is, in the frame 53, the inner diameter of the portion above the step 57 is set larger than the inner diameter of the portion below the step 57. Furthermore, the outer peripheral surface of the fixed frame 51 is formed in a tapered shape so that the diameter of the outer peripheral edge increases toward the upper side.

  On the other hand, as shown in FIG. 5, the light shielding plate 52 includes a holding portion 59 formed in an annular shape having a circular opening window 58, and a wall extending downward over the entire inner periphery of the holding portion 59. Part 60 and a light shielding part 61 extending from the lower edge of the wall part 60 into the opening window 58. However, the light-shielding part 61 is only extended from a part of the wall part 60. In the present embodiment, the light-shielding part 61 is formed in a substantially half region of the opening window 58 so that the plan view is semicircular. . Further, a cutout window 62 having a semicircular shape in plan view is formed in a portion corresponding to the central portion of the opening window 58 so that the light shielding portion 61 has a shape excluding the circular portion in the central portion of the opening window 58. Yes. In the light shielding portion 61, a portion disposed on the peripheral portion of the opening window 58 is inclined downward toward the center portion of the opening window 58 in accordance with the shape of the lens 19 formed in a downwardly convex dome shape. It is formed in a tapered shape. Further, in the present embodiment, a configuration that can easily open the extended window 63 continuous with the cutout window 62 is adopted, and this configuration will be described later.

  Here, there is at least the following dimensional relationship between the fixed frame 51 and the light shielding plate 52. That is, the outer diameter of the holding portion 59 of the light shielding plate 52 is smaller than the inner diameter of the portion above the step 57 in the frame 53 of the fixed frame 51 and is lower than the step 57 in the frame 53 of the fixed frame 51. It is set to be larger than the inner diameter of the portion. Further, the outer diameter of the wall portion 60 of the light shielding plate 52 is set smaller than the inner diameter of the portion below the step 57 in the frame 53 of the fixed frame 51. In addition, the thickness dimension (vertical dimension) of the holding portion 59 in the light shielding plate 52 is set smaller than the vertical dimension from the upper surface to the step 57 in the frame 53 of the fixed frame 51.

  By adopting the above dimensional relationship, the light shielding plate 52 is combined with the fixed frame 51 in such a manner that the wall portion 60 is inserted into the opening 50, so that the holding portion 59 is mounted on the step 57 of the frame body 53. It becomes a placed form. Here, when the fixed frame 51 is attached to the lens block 20, the holding portion 59 of the light shielding plate 52 is sandwiched between the step 57 of the frame body 53 and the lens block 20, but the holding portion 59 has a thickness dimension. Since it is smaller than the gap between the step 57 of the frame 53 and the lens block 20, it is held rotatably in the circumferential direction of the opening 50 within the gap between the step 57 of the frame 53 and the lens block 20. . Further, in order to hold the light-shielding plate 52 in a desired position with respect to the fixed frame 51 while being rotatable, each of the points on the outer peripheral surface of the holding portion 59 that divides the holding portion 59 into three equal parts in the circumferential direction is provided. A contact protrusion 64 that contacts the inner peripheral surface of the frame 53 is provided.

  According to the above-described configuration, the area limiting hood 1 of the present embodiment can rotate the light shielding plate 52 in the circumferential direction of the opening 50 with respect to the fixed frame 51 and the lens block 20. The part covered by the part 61 can be moved in the circumferential direction of the opening 50. In short, there is an advantage that the direction of the detection area can be finely adjusted in the circumferential direction of the opening 50 with the area restriction hood 1 attached. In the area limiting hood 1 of the present embodiment, both the light shielding plate 52 and the fixed frame 51 are made of a synthetic resin material having a light shielding property, but the detection is performed by actually covering a part of the lens 19. Since it is the light shielding part 61 that narrows the region, only the light shielding part 61 may have a light shielding property.

  On the other hand, a configuration for allowing the extended window 63 to be easily opened in the light shielding plate 52 will be described below. As shown in FIG. 6, in the light shielding portion 61, side grooves 65 (separation grooves) are formed on two straight lines connecting the center and the periphery of the opening 50, and both are formed on the concentric circles of the opening 50. A connecting groove 66 (separation groove) that connects ends of the side grooves 65 opposite to the center of the opening 50 is provided. The end of the side groove 65 on the center side of the opening 50 is continuous with the cutout window 62. The side groove 65 has a shape in which a cross section orthogonal to the longitudinal direction is cut into a V shape from both the outside (lower surface side) and the inside (upper surface side) of the light shielding portion 61 as shown in FIG. The connecting groove 66 is formed in a slit shape cut out in the thickness direction of the light shielding portion 61. That is, the fan-shaped piece 67 (separation piece) surrounded by the cutout window 62, the side groove 65, and the connecting groove 66 can be easily broken by simply cutting the portion provided with the side groove 65 in the light shielding portion 61. In the state where 67 is broken, the portion of the lens 19 that is covered by the fan-shaped piece 67 is reduced. In other words, the detection area when the area limiting hood 1 is attached is expanded by the extended window 63 corresponding to the fan-shaped piece 67.

  Also, if the sensor 18 receives heat rays passing through the side grooves 65 and the connecting grooves 66 in a state where the fan-shaped piece 67 is not broken, the heat rays in the region other than the detection region are detected, and the sensor device is erroneously detected. It may become. Therefore, in the portion where the side groove 65 is provided, the light shielding portion 61 is not penetrated in the thickness direction, but the thickness of the light shielding portion 61 is set to be small within a range that does not impair the light shielding property. The heat ray does not pass through the portion 61 where the side groove 65 is provided. In addition, in this embodiment, the side groove 65 having a V-shaped cross section is formed on the outer surface of the light shielding portion 61, and the heat rays incident from the outside into the side groove 65 are reflected by the inner surface of the side groove 65, thereby forming the side groove 65. The introduction of heat rays from the provided portion to the light shielding portion 61 is prevented. On the other hand, as shown in FIG. 7, the width of the connecting groove 66 is made smaller than the thickness of the light shielding portion 61 and the connecting groove 66 is formed from the outside of the area limiting hood 1. The positional relationship between the light receiving part 30 of the sensor 18 and the connecting groove 66 is set so that the light receiving part 30 of the sensor 18 cannot be visually recognized through the reference numeral 66. That is, by providing the connecting groove 66 at a position shifted laterally from directly below the light receiving portion 30 of the sensor 18, the heat rays passing through the connecting groove 66 are not received by the sensor 18. In this way, while the side grooves 65 and the connecting grooves 66 are provided in the light shielding portion 61, the function as the light shielding portion 61 is not impaired by the side grooves 65 and the connecting grooves 66. It is possible to prevent erroneous detection of the sensor device due to the reception of heat rays from the region 65 or the region corresponding to the connecting groove 66.

  Hereinafter, the detection area E in a state where the area restriction hood 1 is attached to the apparatus main body A will be described with reference to FIGS. 8 and 9. Here, the detection region E is shown when the sensor device is attached to a ceiling surface having a height of 2.7 m from the floor surface, and the swing angle of the lens block 20 is set so that the optical axis of the sensor 18 is vertical. Show. Further, for each dimension of the area limiting hood 1, the inner diameter φ1 of the holding portion 59 of the light shielding plate 52 is 29.4 mm, the radius R1 of the notch window 62 is 3.1 mm, and the extended window 63 after the fan-shaped piece 67 is broken. The radius R2 is 6.1 mm, and the central angle C1 of the expansion window 63 is 72 degrees.

  FIG. 8A and FIG. 9A show a detection region E set on the floor surface, and the center of the figure corresponds to a position directly below the sensor 18. The sensor 18 of the present embodiment is a four-element type, that is, four sensor elements of a pyroelectric infrared sensor are arranged at the apexes of a square. Therefore, in FIG. 8A and FIG. 9A, each small area where the sensor sensitivity is maximum for the detection area E is represented by four squares corresponding to the corresponding sensor elements. 8 (a) and 9 (a) indicates a shaded area by attaching the area limiting hood 1 to the apparatus main body A.

  First, when the area restriction hood 1 with the fan-shaped piece 67 attached is attached, as shown in FIG. 8A, the detection area E before the area restriction hood 1 is attached is almost halved on the floor surface. It is narrowed to. However, since the two lens bodies 19a are exposed from the cutout window 62, the small areas corresponding to these lens bodies 19a are left immediately below the center of the lower surface of the sensor device. In FIG. 8B, on the right side of the sensor device not provided with the light shielding portion 61, a detection region E is formed at an opening angle of 54 degrees from a perpendicular passing through the center portion of the lower surface of the sensor device, and the sensor provided with the light shielding portion 61 is provided. On the left side of the device, a detection region E is formed at an opening angle of 14.5 degrees from a perpendicular passing through the center of the lower surface of the sensor device. On the other hand, when the area limiting hood 1 with the fan-shaped piece 67 broken off, that is, with the expansion window 63 opened, is attached, as shown in FIG. 9A, compared to the detection area E in FIG. The detection area E is widened by the extended window 63. In FIG. 9B, the detection region E is formed at an opening angle of 35 degrees to the left from a perpendicular passing through the center of the lower surface of the sensor device.

  Further, the shape of the light shielding plate 52 is not limited to that shown in FIG. Examples of the light shielding plate 52 adopting other shapes are shown in FIGS. The light shielding plate 52 shown in FIGS. 10A and 10B is different from the light shielding plate 52 of FIG. 5 in that the cutout window 62, the side groove 65, and the connecting groove 66 are not provided. In the light shielding plate 52 shown in FIG. 2, the central angle of the opening window 58 is approximately 90 degrees. The light shielding plate 52 shown in FIG. 10C is different from the light shielding plate 52 of FIG. 5 in that the opening window 58 is not provided and two fan-like pieces 67 are provided with the notch window 62 interposed therebetween. To do. That is, each of the two fan-shaped pieces 67 can be folded, and the two fan-shaped pieces 67 remain attached, the one fan-shaped piece 67 is folded, and the both fan-shaped pieces 67 are folded. The detection area E can be expanded in three stages. In the light shielding plate 52 shown in FIG. 10D, four fan-shaped pieces 67 are provided at equal intervals around the notch window 62, and detection regions having various shapes more than the light shielding plate 52 in FIG. 10C. E can be set. Then, the actually used light shielding plate 52 is selected from the plurality of types of light shielding plates 52 shown in FIGS. 5 and 10A to 10D.

  Further, the plurality of types of light shielding plates 52 differ only in the shape of the light shielding portion 61, and the holding portion 59 is formed in the same shape. Thereby, when setting the detection area E of various shapes using the area | region limitation hood 1, only the light-shielding plate 52 should be replaced | exchanged, and there exists an advantage that the fixed frame 51 can be shared.

The principal part of embodiment of this invention is shown, (a) is a disassembled perspective view, (b) is sectional drawing, (c) is sectional drawing. It is an exploded perspective view same as the above. The apparatus main body same as the above is shown, (a) is a front view, (b) is a bottom view. The fixed frame used for the above is shown, (a) is a top view, (b) is a front view, (c) is a side view, (d) is a KK sectional view of (a), and (e) is (a). It is LL sectional drawing of. The light-shielding plate used for the above is shown, (a) is a top view, (b) is a front view, (c) is a side view, (d) is a KK cross-sectional view of (a), and (e) is (a). It is LL sectional drawing of. It is a perspective view which shows the light-shielding plate used for the same as the above. It is sectional drawing which shows the principal part same as the above. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. It is a perspective view which shows the light-shielding plate used for the same as the above. It is a perspective view which shows a prior art example. It is operation | movement explanatory drawing same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Area | region limitation hood 2 Housing 18 (Heat ray) sensor 19 Lens 50 Opening part 51 Fixed frame 52 Light-shielding plate 59 Holding part 61 Light-shielding part 65 Side groove (separation groove)
66 Connection groove (separation groove)
67 Fan-shaped piece (separated piece)
A Device body E Detection area

Claims (4)

A device body with a heat ray sensor in the housing that receives heat rays emitted from the human body existing in the preset detection area through a lens exposed from the housing, and has a light shielding property against the heat rays and is detachable from the device body. An area restriction hood that is attached and covers a part of the lens to narrow the detection area, and the area restriction hood has a circular opening and is attached to and detached from one side of the device body in such a manner that the lens is exposed from the opening. It is composed of a fixed frame that can be attached and a light shielding plate that is held by the fixed frame , and the fixed frame is attached to the apparatus main body in a direction intersecting the one surface of the apparatus main body. forming a gap, the light shielding plate has a holding portion having an outer diameter is held between the large circle is formed annularly solid Teiwaku the apparatus body than the inner diameter of the opening, together with the holding portion It made that have a light-shielding portion disposed in the opening so as to cover a part of the circumferential direction of the opening in the lens holding unit, periphery of the opening in the gap between the fixed frame and the apparatus body A hot-wire human sensor device which is held so as to be rotatable in a direction .   2. The hot-wire human sensor device according to claim 1, wherein a separation groove is formed so as to surround the separation piece so as to be a separation piece that can be partially broken.   The separation groove is opposite to the side groove provided on two straight lines connecting the center of the opening provided on the fixed frame and the periphery of the opening in the light shielding portion, and the center of the opening in both side grooves. A connecting groove for connecting the end portions on the side along the peripheral edge of the opening, the side groove is formed by reducing the thickness of the light shielding portion, and the connecting groove is formed by cutting the light shielding portion in the thickness direction. The hot-wire human sensor device according to claim 2.   4. The heat ray according to claim 1, wherein the light shielding plate is selected from a plurality of types having the same shape of the holding portion and different shapes of the light shielding portion. Type human sensor device.

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