JP4251085B2 - Human body detection device - Google Patents

Description

  The present invention detects the presence and passage of a human body in a detection area of an optical system in a non-contact manner by the amount of heat ray change with the background, and is used, for example, as a switch for controlling the operation of a security alarm device. The present invention relates to a human body detection device.

Conventionally, as shown in FIG. 20, two optical blocks, an optical block 205 composed of a pyroelectric element 201 and a lens 203, and an optical block 206 composed of a pyroelectric element 202 and a lens 204 are independently provided. The upper optical block 205 detects the presence and passage of the human body A by detecting changes in the heat rays from the horizontal area H1 and the lower optical block 206 from the lower area H2, and the lower lens. There is a human body detection device 200 that can adjust the lower area H2 by moving 204 up and down. This human body detection device 200 outputs a detection signal only when the presence and passage of the human body A are detected in both the horizontal area H1 and the lower area H2 in order to prevent malfunction due to the small animal B entering the detection area. is doing.
(For example, see Patent Document 1)
Japanese Patent Laid-Open No. 9-101376 (paragraph number [0022], FIGS. 2 and 3)

  In conventional human body detection devices, many systems using a Fresnel lens that also functions as a detection window are provided as an optical system that collects heat rays. When used outdoors, even if a mirror is used, the area of the optical system is increased to ensure the detection distance (sensitivity), and the focal length of the lens is increased to increase the detection distance. There was a problem of becoming.

  In addition, two independent optical blocks are arranged vertically so as not to give an image of the design size when constructing indoors such as a house, and there is a problem that the arrangement of the optical blocks becomes vertically long.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a human body detection device that is reduced in size by eliminating the arrangement of an optical block having a vertically long shape.

  The invention of claim 1 includes a plurality of optical systems that collect heat rays from at least one of the front and rear directions, a plurality of light receiving elements that convert changes in the heat rays collected by each optical system into electrical signals, An amplifier that amplifies the electric signal output from the light receiving element, a comparator that compares each amplified electric signal with a threshold value, and an alarm signal is output when each comparison result of the comparator reaches a predetermined comparison result A plurality of optical blocks each including an optical system and a light receiving element, and at least one of the plurality of optical blocks includes a rotation mechanism that rotates the optical system in the vertical direction. It consists of optical blocks, each optical block has a different detection area in the vertical direction, and each optical block is juxtaposed in the left-right direction so that the rotating optical block slides with the adjacent optical block when rotating Rutotomoni, characterized in that, each of which is configured into a substantially rectangular parallelepiped shape.

  According to the present invention, by arranging a plurality of optical blocks side by side in the left-right direction, it is possible to eliminate the vertically long arrangement of the optical blocks, and it is possible to easily configure a rotation mechanism for adjusting the detection area, and to further rotate the optical system. By sliding with the adjacent optical block when the block rotates, the distance between the optical blocks adjacent to each other in the left-right direction can be reduced, and the size can be reduced.

  According to a second aspect of the present invention, in the first aspect, the plurality of optical blocks include a rotating optical block having a rotating mechanism for rotating the optical system in the vertical direction, and a fixed optical system fixed to the structure. It is characterized by comprising an optical block.

  According to the present invention, it is not necessary to provide a rotation mechanism for all the optical blocks, and the configuration can be simplified.

  According to a third aspect of the present invention, in the first or second aspect, the rotation axis of the rotating optical block passes through each detection element of the plurality of light receiving elements.

  According to this invention, even when the rotation optical block is rotated and the detection area is adjusted, the focus of the optical system can be adjusted to the detection element, and the detection sensitivity can be kept constant.

  According to a fourth aspect of the present invention, in the second or third aspect, the light receiving element of the rotating optical block is fixed to a structure, and the optical system of the rotating optical block has a focal length of condensing according to a rotation angle. It is variable, and the focal length of the heat ray condensed on the light receiving element of the rotating optical block is changed by rotating the optical system of the rotating optical block.

  According to the present invention, it is possible to set an optimum focal length for incident heat rays according to the distance to the detection target.

  According to a fifth aspect of the present invention, in the second aspect, the light receiving element of the rotating optical block is fixed to a structure, and the rotation axis of the rotating optical block is changed from each detecting element of the plurality of light receiving elements to each light receiving element. It passes through a position shifted in the front-rear direction on the central axis.

  According to the present invention, by rotating the optical system to remove the focus position of the heat ray from the detection element and blur the focus, it is possible to increase the speed of the response to the detection target in the short distance portion.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the at least one optical block includes an optical system having first and second light collecting means, and the detection area of the first light collecting means is the front. The detection area of the second light collecting means is formed in the rear direction, and the first and second light collecting means are each configured by at least one of a parabolic mirror and a plane mirror. It is characterized by.

  According to the present invention, by combining the parabolic mirror and the plane mirror to configure the optical system, it is possible to detect two areas of the front direction and the rear direction with one human body detection device while reducing the number of parts. it can.

  A seventh aspect of the present invention provides the optical system according to any one of the second to sixth aspects, wherein the fixed optical block includes an optical system having first and second light collecting means, and a detection area of the first light collecting means is directed forward. The detection area of the second condensing means is formed in the rear direction, the first and second condensing means form two detection areas that are 180 degrees different from each other, and the rotating optical block is arranged in the left-right direction. Two housings arranged in parallel to each other and one light receiving element housed in the two housings, one housing comprising an optical system having a third light collecting means, and a third light collecting means. A rotating mechanism that rotates in the vertical direction, and the other housing includes an optical system having a fourth light collecting means and a rotating mechanism that rotates the fourth light collecting means in the vertical direction. The detection area of the light collecting means is formed in the forward direction, and the fourth The detection area of the light means is formed in the rear direction, and is condensed on one light receiving element housed in the two housings, and the first, second, third and fourth light collecting means are parabolic mirrors. And a plane mirror, respectively.

  According to the present invention, by combining the parabolic mirror and the plane mirror to configure the optical system, it is possible to detect two areas of the front direction and the rear direction with one human body detection device while reducing the number of parts. it can.

  The invention of claim 8 is characterized in that, in claim 2, the focal length of condensing of the optical system provided in the rotating optical block is longer than the focal length of condensing of the optical system provided in the fixed optical block.

  According to the present invention, it is possible to suppress a lack of sensitivity when detecting a foot part of a human body.

  As described above, in the present invention, the arrangement of the vertically long optical blocks can be eliminated by arranging a plurality of optical blocks in the left-right direction, compared to the arrangement of the conventional optical blocks arranged in a vertically long shape. In addition, the rotation mechanism for adjusting the detection area can be easily configured, and the distance between the optical blocks adjacent to each other in the left-right direction is reduced so that the rotation optical block slides with the adjacent optical block when rotating. There is an effect that downsizing can be achieved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1A shows a front view of the human body detection device E according to the present embodiment viewed from the detection direction, and FIG. 1B shows a side view of the human body detection device E viewed from the right side. Includes a case K (structure), a human body detection unit 100 disposed between the upper and lower mounting plates K1 and K2 arranged in the vertical direction, and a box-shaped storage unit K3 provided at the lower part of the case K. The human body detection unit 100 and the signal processing circuit Pa are connected to each other by a wiring Y.

  The human body detection unit 100 is configured such that two optical blocks are arranged in parallel in the left-right direction, and the arrangement of each optical block is in the left-right direction. The fixed optical block 1 disposed on the left side when viewed from the front, And a rotating optical block 2 arranged on the right side when viewed from the side. The fixed optical block 1 is mounted on a housing 1a which is formed in a substantially box-like shape with the up-down direction as a long direction and has an open front surface, and a single substrate P attached above the front surface of the housing 1a. And a substantially L-shaped extending piece 1 a ′ extending rightward from the upper surface of the fixed optical block 1. The housing 1a is provided with a mirror portion 1b formed of a parabolic mirror as an optical system below the rear bottom surface. The rotating optical block 2 is formed in a substantially box shape with the vertical direction as the long direction and the front surface is opened, and the substrate 2 is arranged on the right side of the light receiving element 3 on the substrate P and accommodated in the housing 2a. And a light receiving element 4. The housing 2a is provided with a mirror portion 2b formed of a parabolic mirror as an optical system below the rear bottom surface.

  The housing 1a of the fixed optical block 1 and the extended piece 1a ′ are fixedly attached between the mounting plates K1 and K2 of the case K which is a structure, and the housing 2a of the rotating optical block 2 is attached to the housing 1a and the extended piece 1a. And is rotatably provided with respect to the housing 1a. 2 and 3, the rotation axis X of the housing 2a is formed in the left-right direction so as to pass through the detection elements 3a and 4a of the light receiving elements 3 and 4, and the side surface of the housing 2a is the housing when rotating. 1a and the extending piece 1a ′ are rotating while sliding on the respective side surfaces, and by reducing the distance between the fixed optical block 1 and the rotating optical block 2, the size of the human body detection unit 100 in the horizontal direction can be reduced. I am trying. In FIG. 2, the extending piece 1a 'is omitted.

  In the above configuration, the printed circuit board P is attached to the housing 1a of the fixed optical block 1 fixed to the case K. On the printed circuit board P, the light receiving element 3 of the fixed optical block 1 and the light receiving element 4 of the rotating optical block 2 are mounted. And have been implemented. Therefore, only the housing 2 a of the rotating optical block 2 rotates with respect to the case K and the fixed optical block 1 while the light receiving element 4 of the rotating optical block 2 is fixed to the case K and the fixed optical block 1.

  Then, as shown in FIG. 4, the fixed optical block 1 detects the body part of the human body A by detecting heat rays from the front horizontal area H1, and the rotating optical block 2 from the front lower area H2. The human body A is mainly detected by detecting the heat rays. At this time, the lower area H2 can be adjusted in the vertical direction by rotating the housing 2a of the rotating optical block 2. As shown in FIG. 5, the heat rays from the horizontal area H1 and the lower area H2 of the human body detection unit 100 are reflected by the mirror units 1b and 2b through the front openings of the housings 1a and 2a, respectively. , 4 are respectively condensed on the detection elements 3a, 4a. A signal processing circuit Pa is connected to the subsequent stage of the light receiving elements 3 and 4 by a wiring Y. As shown in FIG. 6, the signal processing circuit Pa includes amplifiers 5a and 5b, comparators 6a and 6b, and a signal processing circuit 7a. , 7b, a signal control circuit 8 connected to each subsequent stage of the signal processing circuits 7a, 7b, and an output circuit 9.

  Next, as shown in FIG. 4, the detection operation for the human body A1 that exists at a distance L1 in the front direction from the human body detection unit 100 and the human body A2 that exists at a distance L2 in the front direction will be described with reference to FIG. The operation waveform will be described. However, the distance L1 <the distance L2, and the human body A1 exists in both the horizontal area H1 and the lower area H2, and the human body A2 exists only in the horizontal area H1. First, when the human body A2 separated by the distance L2 moves (see FIG. 7A), the heat rays from the horizontal area H1 emitted from the human body A2 are reflected by the mirror portion 1b of the fixed optical block 1 and are reflected on the detection element 3a of the light receiving element 3. Although condensed, there is no heat ray from the lower area H2, and no heat ray is incident on the mirror portion 2b of the rotating optical block 2. The light receiving element 3 converts the change of the condensed heat ray into an electric signal, the amplifier 5a amplifies the electric signal, the comparator 6a compares the amplified electric signal with a predetermined threshold value, and the electric signal is If it is equal to or higher than the threshold value, an “H” level signal is output (see FIG. 7B). The signal processing circuit 7a, to which the “H” level signal is input, outputs the “H” level signal for a certain period (see FIG. 7C). The signal control circuit 8 outputs an “H” level human body detection alarm signal via the output circuit 9 only when “H” level signals are simultaneously input from both the signal processing circuits 7a and 7b. In this case, since the human body A2 exists only within the horizontal area H1, there is no “H” level signal output from the signal processing circuit 7b, and the signal control circuit 8 does not output an alarm signal for human body detection ( (Refer FIG.7 (f)).

  On the other hand, when the human body A1 separated by the distance L1 moves (see FIG. 7A), the heat rays from the horizontal area H1 and the lower area H2 emitted from the human body A2 are reflected in the mirror unit 1b and the rotating optical block 2 of the fixed optical block 1. Are respectively reflected by the mirror part 2b and condensed on the detection elements 3a and 4a of the light receiving elements 3 and 4, respectively. Then, the light receiving elements 3 and 4 respectively convert changes in the condensed heat rays into electric signals, and the amplifiers 5a and 5b respectively amplify the electric signals. The comparators 6a and 6b receive the amplified electric signals and a predetermined threshold value. Are compared with each other, and if the electric signal is equal to or greater than the threshold value, an “H” level signal is output (see FIGS. 7B and 7D). The signal processing circuits 7a and 7b to which the “H” level signal is input output the “H” level signal for a certain period of time (see FIGS. 7C and 7E). The signal control circuit 8 outputs an alarm signal for detecting a human body, since the “H” level signals are simultaneously input from both the signal processing circuits 7a and 7b (see FIG. 7F).

  As shown in FIG. 8, the printed circuit board is divided into a printed circuit board P1 on which the light receiving element 3 is mounted and a printed circuit board P2 on which the light receiving element 4 is mounted, and the printed circuit board P1 is attached to the housing 1a. The printed circuit board P2 may be attached, and further, the divided printed circuit boards P1 and P2 may be attached at positions shifted from each other in the vertical direction. Further, when the printed circuit board is divided in this way, the printed circuit board P2 and the light receiving element 4 may rotate in the same manner when the housing 2a rotates. In FIG. 8, the extended piece 1a 'is omitted.

(Embodiment 2)
As in the first embodiment, the human body detection unit 100 provided in the human body detection device E of the present embodiment has the printed circuit board P attached to the housing 1a of the fixed optical block 1 fixed to the case K. On the printed circuit board P, The light receiving element 3 of the fixed optical block 1 and the light receiving element 4 of the rotating optical block 2 are mounted. The light receiving element 4 of the rotating optical block 2 is rotated in a state of being fixed to the case K and the fixed optical block 1. Only the housing 2a of the optical block 2 rotates relative to the case K and the fixed optical block 1, but the shape of the housing 2a is different from that of the first embodiment as shown in FIG. The housing 2a of the present embodiment is provided with a substantially plate-shaped area mask 10 provided with a heat ray passage hole on the front side of the light receiving element 4 in order to restrict the passage of the heat ray to the heat ray from the lower area H2. Mirror portions 2c, 2d, and 2e made of three parabolic mirrors having different focal lengths are provided on the rear bottom surface in order from above. Here, the trajectories Sc, Sd, Se of the mirror portions 2c, 2d, 2e when the housing 2a is rotated become different trajectories as shown in FIG. 10, and accordingly, by rotating the housing 2a, the three mirror portions 2c, The arrangement of 2d and 2e can be set as appropriate, and a mirror unit having an optimum focal length with respect to incident heat rays can be set according to the distance to the detection target.

(Embodiment 3)
As in the first embodiment, the human body detection unit 100 provided in the human body detection device E of the present embodiment has the printed circuit board P attached to the housing 1a of the fixed optical block 1 fixed to the case K. On the printed circuit board P, The light receiving element 3 of the fixed optical block 1 and the light receiving element 4 of the rotating optical block 2 are mounted. The light receiving element 4 of the rotating optical block 2 is rotated in a state of being fixed to the case K and the fixed optical block 1. Although only the housing 2a of the optical block 2 rotates with respect to the case K and the fixed optical block 1, as shown in FIG. 11, the rotation axis X ′ of the housing 2a is connected to each detection element of the light receiving elements 3 and 4. 3a, 4a is located on the front side (housing 2a side) (the light receiving element 4 is arranged side by side with the light receiving element 3 but is not shown in FIG. 11). It is located on the front surface side on each central axis of the light receiving elements 3 and 4 from the rotation axis X of the first embodiment provided at a position passing through the rement 3a and 4a. That is, in the case of the rotation axis X ′, the distance between the mirror portion 2b and the detection element 4a is variable depending on the rotation angle of the housing 2a as in the rotation locus C ′ of the mirror portion 2b (in the case of the rotation axis X, the rotation locus C). Thus, the distance between the mirror portion 2b and the detection element 4a does not change depending on the rotation angle of the housing 2a.) Therefore, by rotating the housing 2a to remove the focus position of the mirror portion 2b from the detection element 4a and blurring the focus on the detection element 4a, the response to the detection target in the short distance portion can be improved to be faster. . In addition, when the detection target exists in a short distance portion, since the amount of incident heat rays from the lower area H2 is large, the detection sensitivity can be secured to a certain level or more even if the focus is slightly blurred.

(Embodiment 4)
The human body detection unit 100 provided in the human body detection device E of the present embodiment has a detection range in both the front direction and the rear direction, and as shown in FIG. It has a substantially rectangular parallelepiped shape that is long in the left-right direction, and includes a fixed optical block 1 disposed on the left side when viewed from the front surface and a rotating optical block 2 disposed on the right side when viewed from the front surface.

  As shown in FIG. 13, the fixed optical block 1 is formed in a substantially box-like shape with the up-down direction as a long direction, and has a front surface opened and a heat ray incident hole 1f downward from the upper end of the rear surface. The light receiving element 3 is mounted on a single substrate P attached to the front center of the housing 1a and accommodated in the housing 1a. The housing 1a is attached to a structure and includes three mirror portions 1c, 1d, and 1e as an optical system. The mirror portion 1c is a parabolic mirror and is provided above the side surface of the incident hole 1f. 1d is a plane mirror provided below the side surface of the incident hole 1f, and the mirror portion 1e is a parabolic mirror provided below the rear bottom surface of the housing 1a. The fixed optical block 1 reflects the heat rays from the horizontal area H1a in the forward direction by the mirror portion 1e through the front opening of the housing 1a and collects the light on the detection element 3a of the light receiving element 3, and the horizontal area H1a After reflecting the heat ray from the horizontal area H1b in the backward direction which is 180 degrees different from the mirror part 1c, it is reflected again by the mirror part 1d, and is condensed on the detection element 3a of the light receiving element 3 through the incident hole 1f.

  Next, the rotating optical block 2 is mounted on the right side on the substrate P, and the left half is accommodated in the housing 20a and the right half is accommodated in the housing 21a. The light receiving element 4 is housed. The housing 20a is disposed between the housing 1a and the housing 21a. As shown in FIG. 14, the housing 20a is formed in a substantially box-like shape with the up-down direction as a long direction and has a front surface opened, and one mirror portion 20b as an optical system. The mirror portion 20b is a parabolic mirror and is provided below the rear bottom surface of the housing 20a. Then, the rotating optical block 2 reflects the heat rays from the lower area H2a in the front direction by the mirror portion 20b through the front opening of the housing 20a and condenses it on the detection element 4a of the light receiving element 4.

  Next, as shown in FIG. 15, the housing 21a is formed in a substantially box-like shape with the up-down direction as a long direction, opens the front surface, and is provided with an incident hole 21d for heat rays downward from the upper end of the rear surface. Two mirror parts 21b and 21c are provided. The mirror part 21b is a parabolic mirror and is provided on the upper side of the incident hole 21d. The mirror part 21c is a plane mirror on the lower side of the incident hole 21d. Provided. Then, the rotating optical block 2 reflects the heat rays from the lower area H2b in the rearward direction by the mirror portion 21b, and then reflects the heat rays again by the mirror portion 21c, and collects it on the detection element 4a of the light receiving element 4 through the incident hole 21d. Light up.

  In the rotating optical block 2, one light receiving element 4 is accommodated in the housings 20a and 21a. This is because the housings 20a and 21a are narrower than the light receiving element 4, and the light receiving elements are housed one by one in the housings 20a and 21a, so that the size cannot be reduced. Further, by providing one light receiving element 3 in the fixed optical block 1 and one light receiving element 4 in the rotating optical block 2 in this manner, the signal control circuit 8 (see FIG. 6) A logic algorithm that performs AND processing on each detection output (that is, each detection result in the horizontal area and the lower area) to perform human body detection processing can be easily configured.

  The housing 20a is provided to be rotatable with respect to the housings 1a and 21a, and the housing 21a is provided to be rotatable with respect to the housing 20a. As shown in FIG. 3, the rotation axis X of the housings 20a and 21a is formed in the left-right direction so as to pass through the detection elements 3a and 4a of the light receiving elements 3 and 4, and the side surface of the housing 20a is the housing 1a when rotating. , 21a and the housing 21a rotate while sliding on the side surface of the housing 20a. The lower areas H2a and H2b can be adjusted in the vertical direction by rotating the housings 20a and 21a of the rotating optical block 2, respectively.

  In addition, as shown in FIG. 16, for example, when the human body detection device E according to the present embodiment is attached to a pillar T of a structure on the ground G, the horizontal body H1a and H1b differ from each other by 180 degrees in both sides of the pillar T. Each heat ray and heat rays from the lower areas H2a and H2b on both sides of the column T can be detected, and human bodies in the vicinity of the windows W provided on both sides of the column T can be detected.

  As described above, in this embodiment, each optical system is configured by combining a parabolic mirror and a plane mirror, thereby reducing the number of parts and using the single human body detection device E in the forward and backward directions of the horizontal area and the lower area. Two areas of direction are detected respectively. Note that the circuit configuration and operation of the human body detection device E of the present embodiment are the same as those of the first embodiment, and a description thereof will be omitted.

(Embodiment 5)
The human body detection unit 100 included in the human body detection device E of the present embodiment is obtained by making the focal length of the mirror unit 2b of the rotating optical block 2 shown in the first embodiment longer than the focal length of the mirror unit 1b of the fixed optical block 1. The lower area H2 shown in FIG. 4 is narrowed down. This is because the lower area H2, which is the detection range of the rotating optical block 2, mainly targets the heat rays from the foot of the human body A. Since the foot of the human body A has a small area, the focal length of the mirror 2b is increased. Then, by reducing the area D2 of the detection area H2 shown in FIG. 17A to the area D2 of the detection area H2 shown in FIG. 17B, the energy density incident on the light receiving element 4 is increased. , Improving detection sensitivity.

  On the other hand, the horizontal area H1, which is the detection range of the fixed optical block 1, mainly targets the heat rays from the body part of the human body A. Since the body part of the human body A has a large area, the focal length of the mirror part 1b is increased. Even if the area D1 of the detection area H1 shown in FIG. 17A is made as small as the area D1 of the horizontal area H1 shown in FIG. 17B, the detection sensitivity does not change greatly.

(Embodiment 6)
The human body detection unit 100 included in the human body detection device E of the present embodiment avoids a malfunction of human body detection due to frequent malfunction factors such as automobiles passing through the horizontal area H1 that is the detection range of the fixed optical block 1. The horizontal area H1 can be adjusted in the vertical direction so that the horizontal area H1 can be shifted in the vertical direction. Specifically, as shown in FIG. 18, the human body detection unit 100 houses rotating optical blocks 1 ′ and 2 arranged side by side in a horizontal direction in a frame 30 having a substantially U-shaped cross section when viewed from the front. And it is comprised in the substantially rectangular parallelepiped shape which makes the left-right direction long. The rotating optical block 1 ′ is configured such that the fixed optical block 1 of Embodiment 1 is rotatable with respect to the frame 30 and the rotating optical block 2, and the rotation axis X of the housing 1 a is similar to the housing 2 in the light receiving element 3. , 4 are formed in the left-right direction so as to pass through the detection elements 3a, 4a, and a mirror part 1b made of a parabolic mirror is provided below the rear bottom surface as an optical system. The housing 1a rotates while sliding on the side surface of the housing 2a and the inner surface of the frame 30 during rotation, and the housing 2a slides on the side surface of the housing 1a and the inner surface of the frame 30 during rotation. Rotate while. That is, the housings 1a and 2a rotate independently with respect to the frame 30 attached to the structure.

  Alternatively, as shown in FIG. 19, the housing 2 a of the rotating optical block 2 may be rotatably attached to the housing 1 a of the fixed optical block 1, and the housing 1 a may be rotatably attached to the frame 30. The housing 1a rotates, and the housing 2a rotates with respect to the housing 1a.

  The human body detection unit 100 of the present embodiment uses a single printed circuit board P on which both of the light receiving elements 3 and 4 are mounted, and rotates only the housings 1a and 2a, or a print on which the light receiving element 3 is mounted. Any of the configurations in which the housing 1a, the printed circuit board P1, the light receiving element 3, and the housing 2a, the printed circuit board P2, and the light receiving element 4 are rotated by using two pieces of the board P1 and the printed circuit board P2 on which the light receiving element 4 is mounted. But you can. Further, the circuit configuration and operation of the human body detection device E of the present embodiment are the same as those of the first embodiment, and a description thereof will be omitted.

The human body detection apparatus of Embodiment 1 of this invention is shown, (a) is a front view, (b) is a side view. It is a front view which shows a human body detection part same as the above. It is a figure which shows the structure of the rotating shaft of a rotating optical block same as the above. It is a figure which shows the detection range of a human body detection part same as the above. It is the schematic which shows the condensing operation | movement of the heat ray of a human body detection part same as the above. It is a figure which shows a circuit structure same as the above. (A)-(f) It is a figure which shows each operation waveform same as the above. It is a front view which shows the other human body detection part same as the above. It is side surface sectional drawing which shows the housing of the rotation optical block of Embodiment 2 of this invention. It is a figure which shows the locus | trajectory of each mirror same as the above. It is the schematic which shows rotation operation | movement of the rotation optical block of Embodiment 3 of this invention. It is a perspective view which shows the human body detection part of Embodiment 4 of this invention. It is side surface sectional drawing which shows the fixed optical block same as the above. It is side surface sectional drawing which shows the rotation optical block same as the above. It is side surface sectional drawing which shows the rotation optical block same as the above. It is a figure which shows the detection range same as the above. It is a figure which shows the detection range of the optical block of Embodiment 5 of this invention, (a) is a normal detection range, (b) is the state which made the detection range small. It is a front view which shows the human body detection part of Embodiment 6 of this invention. It is a front view which shows the other human body detection apparatus same as the above. It is a figure which shows the conventional human body detection apparatus.

Explanation of symbols

E Human body detection device K Case Pa Signal processing circuit 100 Human body detection unit 1 Fixed optical block 2 Rotating optical block 1a, 2a Housing 1b, 2b Mirror unit 3, 4 Light receiving element 3a, 4a Detection element X Rotating shaft

Claims (8)

A plurality of optical systems for condensing heat rays from at least one of the front and rear directions, a plurality of light receiving elements for converting changes in the heat rays collected by each optical system into electric signals, and an electric signal output by each light receiving element An amplifier for amplifying the signal, a comparator for comparing each amplified electric signal with a threshold value, and an alarm signal output means for outputting an alarm signal when each comparison result of the comparator reaches a predetermined comparison result. Provided with a plurality of optical blocks composed of an optical system and a light receiving element, and at least one of the plurality of optical blocks is composed of a rotating optical block having a rotating mechanism for rotating the optical system in the vertical direction. The optical blocks are arranged side by side in the left-right direction so that the blocks have different detection areas in the vertical direction, and the rotating optical block slides with the optical blocks adjacent to each other when rotating. Human body detecting apparatus characterized by being configured to substantially rectangular parallelepiped shape. The plurality of optical blocks includes a rotating optical block having a rotating mechanism for rotating the optical system in the vertical direction, and a fixed optical block attached to the structure and having the optical system fixed thereto. The human body detection device according to 1. The human body detection device according to claim 1, wherein a rotation axis of the rotary optical block passes through each detection element of a plurality of light receiving elements. The light receiving element of the rotating optical block is fixed to a structure, and the optical system of the rotating optical block can change the focal length of condensing according to the rotation angle. 4. The human body detection device according to claim 2, wherein the focal length of the heat rays condensed on the light receiving element of the rotating optical block is changed by the rotation. The light receiving element of the rotating optical block is fixed to the structure, and the rotation axis of the rotating optical block passes through a position shifted in the front-rear direction on the central axis of each light receiving element from each detection element of the plurality of light receiving elements. The human body detection device according to claim 2. At least one of the optical blocks includes an optical system having first and second light collecting means, the detection area of the first light collecting means is formed in the forward direction, and the detection area of the second light collecting means is the rear. 6. The human body detection device according to claim 1, wherein the first and second light converging means are each formed of at least one of a parabolic mirror and a plane mirror. . The fixed optical block includes an optical system having first and second light collecting means, the detection area of the first light collecting means is formed in the forward direction, and the detection area of the second light collecting means is in the backward direction. Thus, the first and second light collecting means form two detection areas that are 180 degrees different from each other, and the rotating optical block is housed in two housings arranged side by side in the left-right direction and in the two housings. One housing is provided with an optical system having a third light collecting means, and a rotation mechanism for rotating the third light collecting means in the vertical direction, and the other housing is An optical system having a fourth light collecting means; and a rotation mechanism for rotating the fourth light collecting means in the vertical direction. The detection area of the third light collecting means is formed in the forward direction. The detection area of the light collecting means is formed in the rear direction, The light is condensed on one light receiving element housed in the ging, and the first, second, third, and fourth light condensing means are each composed of at least one of a parabolic mirror and a plane mirror. The human body detection device according to claim 2, wherein the human body detection device is characterized in that: The human body detection device according to claim 2, wherein a focal length of condensing of the optical system provided in the rotating optical block is longer than a focal length of condensing of the optical system provided in the fixed optical block.

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