CN111095031B

CN111095031B - Human body detection device and lighting device

Info

Publication number: CN111095031B
Application number: CN201780094650.9A
Authority: CN
Inventors: 松原大介; 伏江辽; 吉野勇人
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-09-12
Filing date: 2017-09-12
Publication date: 2023-06-13
Anticipated expiration: 2037-09-12
Also published as: CN111095031A; WO2019053775A1; JPWO2019053775A1; JP6763486B2

Abstract

The human body detection device (1) is provided with: a first human body detector (2A) having a first visual field, a second human body detector (2B) having a second visual field smaller than the first visual field and at least partially overlapping the first visual field, and a position adjusting device (7) for adjusting the relative position of the second visual field with respect to the first visual field. The position adjustment device (7) is capable of adjusting the angle (θ) between the optical axis (AX 1) of the first human body detector (2A) and the optical axis (AX 2) of the second human body detector (2B). The position adjustment device (7) is capable of moving the position of the second field of view without moving the position of the first field of view.

Description

Human body detection device and lighting device

Technical Field

The present invention relates to a human body detection device and an illumination device.

Background

Human body detectors having thermoelectric elements and lens arrays are widely used. The lens array has a plurality of lenses, each of which condenses infrared rays on the light receiving surface of the pyroelectric element. The lens array (1) provided in the human body detector disclosed in fig. 3 of patent document 1 described below has 26 lenses in total, 14 lenses in the outermost peripheral portion, 8 lenses in the inner side thereof, and further 4 lenses in the inner side thereof. According to the lens array (1), as in fig. 1 of the document, the detection light beam (5) is distributed in the detection area (7). The brackets indicate the reference numerals in this document.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2004-061335

Disclosure of Invention

Problems to be solved by the invention

The human body detector has a detection area capable of detecting the presence of a human body and a blind area incapable of detecting the presence of a human body in its field of view. Each detection region corresponds to the optical path of each lens of the lens array. The dead zone corresponds to the space between adjacent detection zones. The detection area and the blind area are enlarged as they are far from the human body detector. If the distance from the detection area where the human body may exist to the human body detector is not far, the size of the blind area is smaller than the size of the human body, and thus no problem occurs.

However, sometimes the distance from the detection area to the human body detector is far. If the distance from the detection area to the human body detector is long, the blind area may become larger than the size of the human body. In such a case, there is a problem that a human body in a dead zone cannot be detected.

In order to solve the above problems, a countermeasure is considered to increase the number of lenses included in the lens array. However, if the number of lenses included in the lens array is increased, the following other problems occur. The lens array is enlarged. The use of the lens array is specialized. The versatility of the lens array decreases. The cost of the lens array becomes high.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a human body detection device capable of reducing dead zones in which a human body cannot be detected with a simple configuration, and an illumination device provided with the human body detection device.

Means for solving the problems

The human body detection device of the present invention comprises: a first human body detector having a first field of view; a second human detector having a second field of view smaller than the first field of view and at least partially overlapping the first field of view; and a position adjustment unit that adjusts a relative position of the second field of view with respect to the first field of view.

The lighting device of the present invention includes a lighting device and the human body detection device.

Effects of the invention

According to the invention, the dead zone which can not detect the human body can be reduced by a simple structure.

Drawings

Fig. 1 is a perspective view showing a human body detection device according to embodiment 1 and an illumination device provided with the human body detection device.

Fig. 2 is a front view of the human body detection device according to embodiment 1.

Fig. 3 is an exploded perspective view of a human body detector having a lens array and an infrared sensor.

Fig. 4 is a front view of the lens array shown in fig. 3.

Fig. 5 is a side view of the body detector shown in fig. 3.

Fig. 6 is a diagram for explaining a detection region and a blind region of the human body detector.

Fig. 7 is a view for explaining the field of view of the human body detection device according to embodiment 1.

Fig. 8 is a perspective view showing a use example of the lighting device according to embodiment 1.

Fig. 9 is a side view showing a use example of the lighting device according to embodiment 1.

Fig. 10 is a side view of the human body detection device of embodiment 1.

Fig. 11 is a perspective view for explaining the visual field of the human body detection device according to embodiment 1.

Fig. 12 is a perspective view for explaining the visual field of the human body detection device according to embodiment 1.

Fig. 13 is a block diagram of the lighting device of embodiment 1.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are denoted by the same reference numerals, and repetitive description thereof is simplified or omitted.

Embodiment 1

Fig. 1 is a perspective view showing a human body detection device 1 according to embodiment 1, and an illumination device 10 provided with the human body detection device 1. As shown in fig. 1, the lighting device 10 includes a human body detection device 1 and a lighting fixture 11. The lighting fixture 11 of the present embodiment can be preferably used as an indoor or outdoor lighting fixture. In particular, the lighting fixture 11 of the present embodiment can be used as a projector. The lighting fixture 11 can be used in, for example, a tennis court, a playground, a golf range, a parking lot, a factory, a warehouse, a gym, a swimming pool, and the like. The lighting fixture 11 can be configured to irradiate light from an oblique direction to the ground or floor surface. As a modification, the lighting fixture 11 can be used as a high ceiling lighting fixture for factories, warehouses, gyms, sports facilities, and the like, for example. That is, the lighting fixture 11 may be mounted near the ceiling, and may be used for an application of emitting light directly downward.

The lighting fixture 11 includes a fixture body 12, a light source 13, a heat sink 14, a translucent cover 15, a power supply portion 16, and a body support 17. The light source 13, the heat sink 14, the translucent cover 15, and the power supply unit 16 are attached to the device body 12. The body supporter 17 supports the tool body 12.

The number of the light sources 13 may be at least 1. In the illustrated example, 4 light sources 13 are provided. The light source 13 may be provided with a light emitting element using a Light Emitting Diode (LED), for example. In the illustrated example, the light source 13 is provided with a chip-on-board (COB) type LED package. As a modification, the light source 13 may include at least one of a surface mount type LED package, a shell type LED package, an LED package with a light distribution lens, and an LED of a chip scale package, for example. As another modification, the light source 13 may be provided with an organic Electroluminescence (EL) element, a semiconductor laser, or the like, for example.

The heat sink 14 is located on the back side of the light source 13. The heat sink 14 dissipates heat generated by the light source 13 to the surrounding air. The heat sink 14 includes a plurality of fins. The heat sink 14 is disposed in the internal space of the device body 12. The instrument body 12 has a plurality of openings. Through these openings, air can circulate between the internal space of the instrument body 12 and the external space of the instrument body 12.

The translucent cover 15 covers the light source 13. The light emitted from the light source 13 is transmitted through the translucent cover 15 and emitted to the outside space. The translucent cover 15 regularly transmits or diffusely transmits light emitted from the light source 13. By providing the translucent cover 15, dirt can be prevented from adhering to the light source 13. The translucent cover 15 may be made of glass, or may be made of a resin material such as polycarbonate.

The power supply unit 16 is attached to the device body 12 on the opposite side to the light source 13. The power supply unit 16 includes a power supply circuit that converts ac power into dc power. The light source 13 is turned on by dc power supplied from the power supply unit 16 to the light source 13. As a modification, the lighting fixture 11 may not include the power supply unit 16. That is, the lighting fixture 11 may receive the supply of the dc power from the power supply unit provided outside the lighting fixture 11.

The main body supporter 17 has a base portion 17a and a pair of bracket portions 17b protruding from the base portion 17 a. The base portion 17a is fixed to, for example, a building, a pillar, a floor, or the like. The tool body 12 is fixed to the pair of bracket portions 17b by bolts 18. When the bolt 18 is loosened, the tool body 12 can rotate about the bolt 18. When the bolt 18 is fastened again after the appliance body 12 is rotated, the fixing angle of the appliance body 12 with respect to the body holder 17 can be changed. In this way, the light projecting direction of the lighting fixture 11 can be adjusted. In the illustrated example, the main body support 17 is arranged in a posture in which the base portion 17a is horizontal, but the main body support 17 may be arranged in a posture in which the base portion 17a is vertical or inclined.

The lighting fixture 11 is provided with an angle gauge 19. The angle gauge 19 has a scale for displaying the angle of the instrument body 12 with respect to the body holder 17. The angle gauge 19 can be used to know the angle of the fixture body 12 with respect to the body support 17, and thus the angle of the light projecting direction of the lighting fixture 11 can be known.

A bracket 20 is attached to the instrument main body 12. The human body detection device 1 is mounted on the bracket 20. The human body detection device 1 is rotatable with respect to the body support 17 integrally with the instrument body 12. The human body detection device 1 is connected to the power supply unit 16 via a cable 21. The power from the power supply unit 16 is supplied to the human body detection device 1 via the cable 21. The detection signal from the human body detection device 1 is input to the power supply section 16 via the cable 21.

The human body detection device 1 includes a first human body detector 2A, a second human body detector 2B, a light shield 5, and a position adjustment device 7. The light shield 5 is for covering the surroundings of the first human body detector 2A and the second human body detector 2B so as not to allow light emitted from the lighting fixture 11 to enter the light receiving portions of the first human body detector 2A and the second human body detector 2B. The position adjustment device 7 will be described later.

Fig. 2 is a front view of the human body detection device 1 according to embodiment 1. Fig. 2 is a view from a direction parallel to the optical axes of the first human body detector 2A and the second human body detector 2B. The first human body detector 2A includes a lens array 3A and a housing 4A. The lens array 3A is provided on one surface of the housing 4A. The second human body detector 2B includes a lens array 3B and a housing 4B. The lens array 3B is provided on one surface of the housing 4B. Infrared sensors 6 described later are disposed inside the

housings

4A and 4B, respectively.

The first human body detector 2A and the second human body detector 2B are disposed adjacent to each other. The distance between the center of the first human body detector 2A and the center of the second human body detector 2B may be, for example, about 1cm to 10 cm.

Fig. 3 is an exploded perspective view of the human body detector 2 having the lens array 3 and the infrared sensor 6. Fig. 4 is a front view of the lens array 3 shown in fig. 3. Fig. 5 is a side view of the human body detector 2 shown in fig. 3. The first human body detector 2A and the second human body detector 2B in embodiment 1 have similar structures to the human body detector 2 shown in fig. 3 to 5. Therefore, the explanation of the first human body detector 2A and the second human body detector 2B will be described on the human body detector 2 as a representative.

As shown in fig. 3 and 5, the human body detector 2 includes an infrared sensor 6. The infrared sensor 6 has a light receiving surface 6a that receives infrared rays. The infrared sensor 6 in the present embodiment is a pyroelectric type infrared sensor having a pyroelectric element. Alternatively, any one of a thermoelectromotive type infrared sensor using a thermopile, a conductive type infrared sensor, and a thermal expansion type infrared sensor may be used as the infrared sensor 6. In the following description, a normal line of the light receiving surface 6a passing through the center of the light receiving surface 6a is referred to as an "optical axis" of the human body detector 2 and the infrared sensor 6. As shown in fig. 5, in the human body detector 2, the center line of the lens array 3 coincides with the optical axes AX of the human body detector 2 and the infrared sensor 6.

As shown in fig. 4, the lens array 3 has a plurality of

lenses

3a, 3b, 3c. The

lenses

3a, 3b, and 3c are configured to collect infrared rays toward the light receiving surface 6a of the infrared sensor 6, respectively. The outer shape of the lens array 3 is circular as viewed from the direction of the center line of the lens array 3. The

lenses

3a, 3b, 3c are condensing lenses, respectively. The

lenses

3a, 3b, 3c may be convex lenses, respectively. The

lenses

3a, 3b, 3c may be aspherical lenses, respectively. The

lenses

3a, 3b, 3c may be fresnel lenses, respectively.

The lens array 3 is made of a material having infrared ray permeability. The material of the lens array 3 may be polyethylene, for example. The lens array 3 may be manufactured by injection molding or compression molding, for example. The material of the lens array 3 may contain a pigment such as titanium dioxide or zinc oxide, for example.

The lens array 3 has a circular outer shape as viewed from a direction parallel to the center line of the lens array 3. The lens array 3 of the illustrated example has 8 lenses 3a, 8 lenses 3b, 4 lenses 3c. The lens 3a is located at the outermost peripheral portion farthest from the center line of the lens array 3. The lenses 3a are equally arranged along the circumferential direction. That is, the lenses 3a are arranged at 45-degree intervals around the center line of the lens array 3. The lens 3b is located inside with respect to the lens 3 a. The lenses 3b are equally arranged along the circumferential direction. That is, the lenses 3b are arranged at 45-degree intervals around the center line of the lens array 3. The lens 3c is located inside with respect to the lens 3 b. The lens 3c is located at the innermost peripheral portion nearest to the center line of the lens array 3. The lenses 3c are equally arranged along the circumferential direction. That is, the lenses 3c are arranged at 90-degree intervals around the center line of the lens array 3. In the lens array 3, the

lenses

3c, 3b, and 3a are arranged in a three-layer ring shape from the center toward the outside.

Fig. 6 is a diagram for explaining the detection area and the blind area of the human body detector 2. Fig. 6 is a view from the horizontal direction. Fig. 6 is a schematic diagram. The dimensional ratios in fig. 6 do not reflect the actual dimensional ratios. In fig. 6, the dimensions of the body detector 2 are drawn extremely exaggerated.

In fig. 6, for convenience of explanation, the following will be described. The lens array 3 of the human body detector 2 includes a plurality of lenses 31. The lens array 3 is shown in cross-section. The plane 100 is a ground or floor surface on which a person, possibly detected by the body detector 2, stands. The distance from the plane 100 to the human body detector 2 may be, for example, about several m to 20 m.

The human body detector 2 has a plurality of detection areas 70. The human body detector 2 has a plurality of detection areas 70 distributed in a space corresponding to the field of view of the human body detector 2. Each detection region 70 corresponds to an optical path of each infrared ray from the plane 100 to the light receiving surface 6a of the infrared sensor 6 through the plurality of lenses 31 of the lens array 3. The dead zone 80 corresponds to the space between adjacent detection zones 70. In the field of view of the human body detector 2, there are a plurality of detection areas 70 and blind areas 80. The detection area 70 and the blind area 80 expand as the distance from the human body detector 2 becomes longer. The human body detector 2 is capable of detecting a human body 200 present in the detection region 70. The human body detector 2 cannot detect the human body 300 existing in the blind area 80. This is because the infrared rays from the human body 300 existing in the blind area 80 cannot reach the light receiving surface 6a of the infrared sensor 6.

In the case where the infrared sensor 6 includes, for example, a quad type thermoelectric element having 4 rectangular light receiving electrodes on the light receiving surface 6a, each detection region 70 is actually configured as a set of 4 partitions having rectangular cross sections corresponding to the shape of the light receiving electrodes. In this regard, in fig. 6 and the drawings described later, the shape of each detection region 70 is schematically shown for the sake of simplifying the drawings. The thermoelectric element included in the infrared sensor 6 is not limited to the quaternary type, and may be any thermoelectric element such as a single type (single type), a dual type (dual type), or a dual twin type (dual type).

Fig. 7 is a view for explaining the visual field of the human body detection device 1 according to embodiment 1. Fig. 7 is a schematic diagram. The dimensional ratios in fig. 7 do not reflect the actual dimensional ratios. L1 in fig. 7 is a distance between the first human body detector 2A and the second human body detector 2B. For example, the distance between the center of the first human body detector 2A and the center of the second human body detector 2B corresponds to the distance L1. The distance L1 is, for example, about 1cm to 10 cm.

The first human body detector 2A has a first field of view 9A. The second human body detector 2B has a second field of view 9B at least partially overlapping the first field of view 9A. The second field of view 9B is smaller than the first field of view 9A. That is, the field angle β of the second field of view 9B is smaller than the field angle α of the first field of view 9A. In the present embodiment, each of the first field of view 9A and the second field of view 9B has a conical shape in three-dimensional space. As a modification, the first field of view 9A and the second field of view 9B may each have a quadrangular pyramid shape in the three-dimensional space.

L2 in fig. 7 is the width of the first field of view 9A on the plane 100 on which the person is standing, which is likely to be detected by the human detection device 1. L3 is the width of the second field of view 9B on the plane 100. The distance from the plane 100 to the human body detection device 1 may be, for example, about several m to 20 m. In this case, the widths L2, L3 may be about 10m to several tens of m. In this way, in the actual size ratio, the widths L2, L3 are overwhelmingly large with respect to the distance L1. Therefore, in the state of fig. 6, substantially the entire second field of view 9B is considered to overlap with the first field of view 9A.

As a modification, the second field of view 9B may have a portion that does not overlap with the first field of view 9A. That is, a portion of the second field of view 9B may be outside the first field of view 9A. Preferably, a large portion of the second field of view 9B overlaps the first field of view 9A. However, more than half of the second field of view 9B may overlap the first field of view 9A.

Fig. 8 and 9 are diagrams showing examples of use of the lighting device 10 according to embodiment 1. Fig. 8 is a perspective view, and fig. 9 is a side view. Fig. 8 and 9 show examples in which the lighting device 10 is provided so that the lighting device 11 irradiates the plane 100 with light from a direction obliquely upward. Fig. 8 and 9 are schematic views. The dimensional ratios in fig. 8 and 9 do not reflect the actual dimensional ratios.

The irradiation region 101 represents a region where light from the lighting fixture 11 is irradiated to the plane 100 when the lighting fixture 11 is turned on. By irradiating the plane 100 with light from a direction obliquely upward, the irradiation region 101 becomes elliptical. The irradiation region 101 drawn below the plane 100 in fig. 9 shows the shape of the irradiation region 101 when the plane 100 is viewed from directly above. The area where the plane 100 intersects the first field of view 9A is also elliptical in shape. The area where the plane 100 intersects the second field of view 9B is also elliptical in shape. By disposing the first field of view 9A and the second field of view 9B as shown in fig. 8 and 9, a person in the irradiation region 101 can be detected.

Fig. 10 is a side view of the human body detection device 1 of embodiment 1. Fig. 10 is a view from a direction perpendicular to the optical axes of the first human body detector 2A and the second human body detector 2B. In fig. 10, for convenience of viewing the drawing, a sectional view is taken for the light shield 5.

As shown in fig. 10, the human body detection device 1 includes a position adjustment device 7. The position adjustment device 7 is an example of a position adjustment means for adjusting the relative position of the second field of view 9B with respect to the first field of view 9A. The position adjustment device 7 has an arm portion 7a and a support shaft 7b. The arm portion 7a has a first end portion fixed so as not to be rotatable with respect to the housing 4A of the first human body detector 2A and a second end portion coupled to the housing 4B of the second human body detector 2B. The second end of the arm 7a is coupled to the housing 4B of the second human detector 2B via a support shaft 7B. The housing 4B of the second human body detector 2B is rotatable about the support shaft 7B with respect to the arm 7 a. When the housing 4B of the second human body detector 2B rotates about the support shaft 7B, the angle θ between the optical axis AX1 of the first human body detector 2A and the optical axis AX2 of the second human body detector 2B changes. In the following description, this angle θ will be referred to as "inter-optical axis angle θ".

By adjusting the optical axis-to-axis angle θ, the relative position of the second field of view 9B with respect to the first field of view 9A can be adjusted. The housing 4B of the second human body detector 2B may be rotatable about the support shaft 7B by loosening a screw (not shown), and the housing 4B of the second human body detector 2B may be fixed so as not to be rotatable with respect to the arm 7a by tightening the screw. The support shaft 7B, which is the rotation shaft of the second human body detector 2B, is parallel to the rotation shaft of the appliance body 12 of the lighting appliance 11 with respect to the body support 17.

Fig. 10 shows a state in which the optical axis AX2 of the second human body detector 2B is not parallel to the optical axis AX1 of the first human body detector 2A. Instead of such a state, the position adjustment device 7 may set the optical axis AX2 of the second human body detector 2B to be parallel to the optical axis AX1 of the first human body detector 2A. That is, the position adjustment device 7 can set the inter-optical axis angle θ to 0 degrees.

The angle gauge 22 displays the inter-optical axis angle θ. The angle gauge 22 has a scale provided in the housing 4B of the second human body detector 2B and an arrow provided in the arm 7 a. By reading the scale indicated by the arrow, the inter-optical axis angle θ can be known.

The housing 4A of the first human body detector 2A is fixed to the bracket 20 using the first screw 23 and the second screw 24, and the bracket 20 is fixed to the fixture body 12 of the lighting fixture 11. The housing 4A has a long hole 25 having a circular arc shape centered on the first screw 23. The second screw 24 is inserted into the long hole 25. When the first screw 23 and the second screw 24 are unscrewed, the housing 4A of the first human body detector 2A can be rotated about the first screw 23. When the frame body 4A rotates around the first screw 23, the relative position of the second screw 24 with respect to the long hole 25 moves along the longitudinal direction of the long hole 25. When the housing 4A rotates, the human body detecting device 1 rotates as a whole. When the first screw 23 and the second screw 24 are tightened again, the frame body 4A is fixed to the bracket 20 at this position. In the present embodiment, the mounting angle of the human body detection device 1 with respect to the appliance body 12 of the lighting appliance 11 can be adjusted in this manner.

If the optical axis AX1 of the first human body detector 2A is parallel to the optical axis of the illumination fixture 11, the irradiation area of the illumination fixture 11 coincides with the field of view of the human body detection device 1. In this usage mode, for example, the body of a person who enters the irradiation region of the lighting fixture 11 from the outside can be detected by the human body detection device 1, and the lighting fixture 11 can be turned on. Conversely, the optical axis AX1 of the first human body detector 2A may be non-parallel with respect to the optical axis of the lighting fixture 11. In this usage mode, for example, the field of view of the human body detection device 1 may be arranged in front of the irradiation area of the lighting fixture 11 in the path of a person. Thus, the human body detection device 1 can detect a human body at a position in front of the illumination area where the human body enters the illumination device 11, and illuminate the illumination device 11. According to the present embodiment, by providing the above-described mechanism capable of adjusting the mounting angle of the human body detection device 1 with respect to the appliance body 12 of the lighting appliance 11, any use mode can be handled.

As a modification, there may be no mechanism for adjusting the attachment angle of the human body detection device 1 to the appliance body 12 of the lighting appliance 11. For example, the human body detection device 1 may be fixed to the instrument body 12 so that the optical axis AX1 of the first human body detector 2A is parallel to the optical axis of the illumination instrument 11. In principle, the following description will be given assuming that the optical axis AX1 of the first human body detector 2A is parallel to the optical axis of the lighting fixture 11.

The light shielding cover 5 is coupled to the housing 4A of the first human body detector 2A via a support shaft 5 a. The support shaft 5a is parallel to the support shaft 7b. The shade 5 is rotatable about a support shaft 5a with respect to the housing 4A. By rotating the shade 5 about the support shaft 5a, the fixed angle of the shade 5 with respect to the first human body detector 2A can be adjusted. By adjusting the fixed angle of the shade 5, the position of the shade 5 can be adjusted to a more appropriate position according to the inter-optical axis angle θ or the like. As a modification, the light shield 5 may be fixed so as not to rotate with respect to the first human body detector 2A.

As shown in fig. 2, the lens array 3A of the first human body detector 2A has a plurality of lenses 3d arrayed in a ring shape at equal intervals along the circumferential direction on the outer circumferential side and a plurality of lenses 3e arrayed in a ring shape at equal intervals along the circumferential direction on the inner circumferential side. In the lens array 3A, the

lenses

3e and 3d are arranged in a double-layered ring shape from the center toward the outside. As a modification, the lens array 3A may include annular lens groups arranged in three layers as in the lens array 3 described above.

As shown in fig. 2, the lens array 3B of the second human body detector 2B has a plurality of lenses 3f arrayed in a ring shape at equal intervals along the circumferential direction on the outer circumferential side and a plurality of lenses 3g arrayed in a ring shape at equal intervals along the circumferential direction on the inner circumferential side. In the lens array 3B, the

lenses

3g and 3f are arranged in a double-layered ring shape from the center toward the outside. As a modification, the lens array 3B may include annular lens groups arranged in three layers, as in the lens array 3.

Fig. 11 and 12 are perspective views for explaining the visual field of the human body detection device 1 according to embodiment 1. Fig. 11 and 12 show the field of view of the human body detection device 1 in the case of the use examples shown in fig. 8 and 9. In fig. 11 and 12, the lighting device 10 irradiates the plane 100 with light from a direction obliquely upward and rightward, as in fig. 9. The optical axis AX1 of the first human body detector 2A and the optical axis AX2 of the second human body detector 2B are also inclined with respect to the plane 100.

In fig. 11 and 12, a first field of view 9A indicated by a broken-line ellipse represents an area in three-dimensional space where the first field of view 9A intersects with the plane 100. In fig. 11 and 12, the second field of view 9B indicated by a broken-line ellipse represents an area in three-dimensional space where the second field of view 9B intersects the plane 100.

The first human body detector 2A has a plurality of first detection areas 71. As shown in fig. 11 and 12, the plurality of first detection areas 71 are distributed on the outer periphery of the first field of view 9A. Each of the first detection areas 71 is a detection area formed by each of the lenses 3e located at the outermost periphery of the lens array 3A. In fig. 11 and 12, each first detection region 71 indicated by an ellipse represents a region where each first detection region 71 in three-dimensional space intersects with the plane 100. The detection regions formed by the plurality of lenses 3d of the lens array 3A are distributed in the region surrounded by the plurality of first detection regions 71, but are not shown in fig. 11 and 12. The number of first detection areas 71 is equal to the number of lenses 3e. However, since fig. 11 and 12 are schematic views, the number of first detection areas 71 shown in these views may not match the number of lenses 3e shown in fig. 2.

The second human body detector 2B has a plurality of second detection areas 72. As shown in fig. 11 and 12, the plurality of second detection areas 72 are distributed on the outer periphery of the second field of view 9B. Each of the second detection areas 72 is a detection area formed by each of the lenses 3f located at the outermost periphery of the lens array 3B. In fig. 11 and 12, each second detection region 72 indicated by an ellipse represents an area where each second detection region 72 in three-dimensional space intersects with the plane 100. The detection regions formed by the plurality of lenses 3g of the lens array 3B are distributed in the region surrounded by the plurality of second detection regions 72, but are not shown in fig. 11 and 12. The number of second detection areas 72 is equal to the number of lenses 3 f. However, since fig. 11 and 12 are schematic views, the number of second detection areas 72 shown in these views may not match the number of lenses 3f shown in fig. 2.

Fig. 11 shows a state where the optical axis AX2 of the second human body detector 2B is parallel to the optical axis AX1 of the first human body detector 2A, that is, a state where the inter-optical axis angle θ is 0 degrees. As shown in fig. 11, the first human body detector 2A has

blind areas

81, 82. The

blind areas

81, 82 are spaces between adjacent first detection areas 71. Since the optical axis AX1 of the first human body detector 2A is inclined with respect to the plane 100, the dead zone 81 at a position distant from the human body detection device 1 is larger than the dead zone 82 at a position close to the human body detection device 1.

The blind area 81 may be larger than the size of the human body. As shown in fig. 11, for example, when a person 400 who walks in from outside the first visual field 9A enters the first visual field 9A through the blind area 81 without passing through the first detection area 71, the first human body detector 2A may not detect the body of the person 400. Therefore, it is possible that the human body detection apparatus 1 cannot immediately detect the human body 400 entering the first visual field 9A from the outside.

When the inter-optical axis angle θ is adjusted as shown in fig. 10 from a state where the inter-optical axis angle θ is 0 degrees, the relative position of the second field of view 9B with respect to the first field of view 9A moves in the left direction in fig. 11. As a result, the state shown in fig. 12 is achieved. In the state shown in fig. 12, at least one second detection region 72 overlaps with at least one blind region 81. This can obtain the following effects. It is assumed that a person 400 who walks from outside the first visual field 9A enters the first visual field 9A through the blind area 81 without passing through the first detection area 71. The second human body detector 2B can detect the body of the person 400 through the second detection region 72 overlapping the blind region 81. In this way, it is possible to reduce the possibility that the human detection device 1 cannot immediately detect the human 400 entering the first visual field 9A from the outside.

According to the present embodiment, even when the human body detection device 1 is disposed at a position away from the plane 100 where a human body is likely to be present, particularly when the human body detection device 1 is disposed so as to be inclined with respect to the plane 100, it is possible to reduce the dead zone where the human body detection device 1 cannot detect a human body without increasing the number of lenses included in the

lens arrays

3A and 3B. Therefore, since

large lens arrays

3A and 3B or

special lens arrays

3A and 3B are not required, the above-described effects can be achieved by using highly versatile and low-

cost lens arrays

3A and 3B.

The position adjustment device 7 of the present embodiment can move the position of the second human detector 2B without moving the position of the first human detector 2A. Therefore, the position adjustment device 7 can move the position of the second field of view 9B without moving the position of the first field of view 9A. The wide first field of view 9A is arranged in correspondence with an area where a human body is to be detected, for example, an irradiation area of the lighting fixture 11, and therefore the necessity of movement is low. The above-described effects can be obtained by moving the position of the narrower second field of view 9B to an appropriate position.

As shown in fig. 11 and 12, the position adjustment device 7 according to the present embodiment can adjust the relative position of the second visual field 9B with respect to the first visual field 9A while maintaining the state where the entire second visual field 9B overlaps the first visual field 9A. This makes it possible to easily move the second field of view 9B to a position in the first field of view 9A where the blind area needs to be compensated for by the second human detector 2B.

According to the position adjustment device 7 of the present embodiment, the relative position of the second field of view 9B with respect to the first field of view 9A can be moved in the "first direction" in fig. 11 and 12 by adjusting the inter-optical axis angle θ. The first field of view 9A has a first edge 91 and a second edge 92 located opposite the first edge 91 across the center of the first field of view 9A. The positional relationship shown in fig. 11 corresponds to a first positional relationship in which the second visual field 9B is closer to the first edge 91 than to the second edge 92. The positional relationship shown in fig. 12 corresponds to a second positional relationship in which the second visual field 9B is closer to the second edge 92 than to the first edge 91. Since the relative position of the second visual field 9B with respect to the first visual field 9A can be adjusted as described above, the second visual field 9B can be easily moved to a position in the first visual field 9A where the blind area needs to be compensated for by the second human body detector 2B.

As a modification, the position adjustment device 7 may be configured so that the relative position is movable in a "second direction" orthogonal to the "first direction" in fig. 11 and 12. For example, the position adjustment device 7 may further include a support shaft perpendicular to the support shaft 7B, and the housing 4B of the second human body detector 2B may be supported so as to be rotatable about the support shaft.

The number of lenses 3e located at the outermost periphery of the lens array 3A of the first human body detector 2A, that is, the number of first detection areas 71 is set to "first number". The number of lenses 3f located at the outermost periphery of the lens array 3B of the second human body detector 2B, that is, the number of second detection areas 72 is set to "second number". In this embodiment, "second number" is larger than "first number". This can obtain the following effects. The size of the blind spot between adjacent second detection areas 72 becomes sufficiently small. Therefore, the second human body detector 2B can more reliably detect the human body passing through the blind area 81 when the blind areas 81 between the adjacent first detection areas 71 are compensated for by the second detection areas 72.

In the present embodiment, the optical axis AX1 of the first human body detector 2A is fixed so as to be parallel to the optical axis of the lighting fixture 11, while the optical axis AX2 of the second human body detector 2B can be adjusted by the position adjustment device 7 so as to be non-parallel to the optical axis of the lighting fixture 11. This can obtain the following effects. The wide first field of view 9A can be fixed in advance in association with an area where a human body is to be detected, for example, an irradiation area of the lighting fixture 11. The second field of view 9B can be easily moved to a position in the fixed first field of view 9A where the blind area needs to be compensated for by the second human body detector 2B. Instead of the above configuration, the optical axis AX2 of the second human body detector 2B may be fixed parallel to the optical axis of the lighting fixture 11.

The inclination angle of the optical axis of the lighting fixture 11 with respect to the plane 100 (hereinafter, referred to as "projection angle") can be obtained from the angle gauge 19 provided in the lighting fixture 11. The light projecting angle is equal to the inclination angle of the optical axis AX1 of the first human body detector 2A with respect to the plane 100. Therefore, the angle gauge 19 corresponds to a unit that displays information on the inclination angle of the optical axis AX1 of the first human body detector 2A or the optical axis AX2 of the second human body detector 2B with respect to the plane 100 (ground or floor surface). The angle gauge 22 displaying the inter-axis angle θ corresponds to a unit displaying information related to the angle between the optical axis AX1 of the first human body detector 2A and the optical axis AX2 of the second human body detector 2B.

When the fixture body 12 is rotated relative to the body support 17 in order to change the light projecting direction of the lighting fixture 11, the inclination angle of the optical axis AX1 of the first human body detector 2A relative to the plane 100 also changes. Then, the positional relationship between the first field of view 9A and the second field of view 9B on the plane 100 also changes, and thus the appropriate value of the optical axis angle θ also changes. For example, a table indicating an appropriate value of the inter-optical axis angle θ corresponding to the projection angle may be provided near the angle gauge 22 or the angle gauge 19. This makes it possible to easily perform an operation of adjusting the inter-optical axis angle θ according to the projection angle. The human body detection device 1 may further include a mechanism for automatically adjusting the angle θ between the optical axes. For example, a sensor for detecting the light projection angle may be provided, and the inter-optical axis angle θ may be automatically adjusted by an actuator based on the detected light projection angle.

The human body detection device 1 may be used in a posture in which at least one of the optical axis AX1 of the first human body detector 2A and the optical axis AX2 of the second human body detector 2B is perpendicular to the plane 100. For example, the relative position of the second visual field 9B with respect to the first visual field 9A may be adjusted by the position adjustment device 7 so that the second visual field 9B approaches a position (for example, entrance of a person) in the outer periphery of the first visual field 9A where the possibility of the person passing through is high.

Fig. 13 is a block diagram of the lighting device 10 according to embodiment 1. As shown in fig. 13, the lighting device 10 includes a switching element 27. The switching element 27 opens and closes a path through which power is supplied from the power supply unit 16 to the light source 13. The first human body detector 2A and the second human body detector 2B output human body detection signals when detecting the presence of a human body, respectively. The human body detection device 1 includes a control circuit 28 that receives human body detection signals from the first human body detector 2A and the second human body detector 2B. The control circuit 28 switches on and off the switching element 27 in accordance with the human body detection signals from the first human body detector 2A and the second human body detector 2B, thereby controlling the lighting, extinguishing, dimming, and the like of the light source 13. For example, the control circuit 28 may turn on the light source 13 when a human body detection signal is received from at least one of the first human body detector 2A and the second human body detector 2B. The control circuit 28 may turn off the light source 13 when the state in which the first human body detector 2A and the second human body detector 2B do not output the human body detection signal continues.

The position adjustment device 7 of the present embodiment adjusts the relative position of the second field of view 9B with respect to the first field of view 9A by adjusting the position of the second human body detector 2B itself with respect to the first human body detector 2A. Instead of such a configuration, a position adjustment means that can adjust the relative position of the second visual field 9B with respect to the first visual field 9A by adjusting the optical path of the infrared ray incident on the first human body detector 2A or the second human body detector 2B using an optical element such as a mirror may be used. In such a position adjustment unit, there is no need to adjust the position of the second human detector 2B itself with respect to the first human detector 2A.

In the present embodiment, a human body detection apparatus 1 including two human body detectors 2 is described as an example. Instead of this example, a human body detection device including three or more human body detectors 2 may be configured.

In the present embodiment, an example in which the human body detection device 1 is applied to control of the lighting fixture 11 is described, but the object to be controlled by the human body detection device 1 is not limited to the lighting fixture 11. For example, the control using the human body detection device 1 may be applied to at least one of an air conditioning device, an air purifying device, a ventilation device, a digital signage, a television, and an anti-theft device.

Description of the reference numerals

1 a human body detection device; 2a human body detector; 2A first human body detector; 2B a second human detector; 3. 3A, 3B lens arrays; 3a, 3b, 3c, 3d, 3e, 3f, 3g lenses; 4A, 4B frame; 5, a light shield; 6 an infrared sensor; 7a position adjusting device; 7a arm sections; 7b supporting the shaft; 9A first field of view; 9B a second field of view; 10 a lighting device; 11 a lighting fixture; 12 an appliance body; 13 a light source; 14 a heat sink; 15 a light-transmitting cover; a 16 power supply section; 17a body support; 19. 22 angle gauges; 27 a switching element; 28 control circuitry; 31 lenses; 70 detection zone; 71 a first detection zone; a second detection zone 72; 80. 81, 82 dead zones; 100 plane.

Claims

1. A human body detection device is provided with:

a first human body detector having a first field of view;

a second human body detector having a second field of view with a smaller angle of view than the first field of view; and

a position adjustment unit that adjusts a relative position of the second field of view with respect to the first field of view,

the first person detector is provided with an infrared sensor and a lens array,

the second human body detector is provided with an infrared sensor and a lens array,

the lens array of the first body detector has a first number of lenses located at an outermost periphery,

the lens array of the second body detector has a second number of lenses located at an outermost periphery,

the second number is greater than the first number,

the entire second field of view is brought into the first field of view,

by means of the position adjustment unit, the position of the second field of view can be moved in the first field of view,

the first person detector has the first number of first detection areas distributed over an outer periphery of the first field of view,

the second human detector has the second number of second detection areas distributed over the outer periphery of the second field of view,

the size of the blind area between the adjacent second detection areas is smaller than the size of the blind area between the adjacent first detection areas,

the first visual field has a first edge portion at a position close to the human body detecting device and a second edge portion at a position opposite to the first edge portion across a center of the first visual field and distant from the human body detecting device,

a positional relationship in which the second visual field is closer to the second edge than to the first edge can be achieved by the position adjustment means,

the relative position can be adjusted by the position adjustment unit so that at least one of the second number of the second detection areas overlaps the blind area of the first human body detector.

2. The human body detecting device according to claim 1, wherein,

the position adjustment unit is capable of adjusting an angle between an optical axis of the first human body detector and an optical axis of the second human body detector.

3. The human body detecting device according to claim 1 or 2, wherein,

the position adjustment unit is capable of moving the position of the second field of view without moving the position of the first field of view.

4. The human body detecting device according to claim 1 or 2, wherein,

the position adjustment unit is capable of adjusting the relative position while maintaining a state in which the entire second visual field overlaps the first visual field.

5. The human body detecting device according to claim 1 or 2, wherein,

the position adjustment means may be configured to achieve a first positional relationship in which the second visual field is closer to the first edge than to the second edge, and a second positional relationship in which the second visual field is closer to the second edge than to the first edge.

6. The human body detecting device according to claim 1 or 2, wherein,

the human body detection device can be used in a state in which the optical axis of the first human body detector and the optical axis of the second human body detector are inclined with respect to the ground or floor surface.

7. The human body detecting device according to claim 6, wherein,

the position adjustment unit is capable of adjusting an angle between an optical axis of the first human body detector and an optical axis of the second human body detector,

the human body detection device is provided with:

a unit that displays information on an inclination angle of an optical axis of the first human body detector or an optical axis of the second human body detector with respect to a ground surface or a floor surface; and

and a unit displaying information related to an angle between an optical axis of the first human body detector and an optical axis of the second human body detector.

8. The human body detecting device according to claim 1 or 2, wherein,

more than half of the second field of view overlaps the first field of view.

9. An illumination device, comprising:

a lighting fixture; and

the human body detection apparatus of any one of claims 1 to 8.

10. The lighting device of claim 9, wherein,

the optical axis of the first human detector is parallel with respect to the optical axis of the lighting fixture.