WO2018101002A1 - Infrared detection device - Google Patents

Infrared detection device Download PDF

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Publication number
WO2018101002A1
WO2018101002A1 PCT/JP2017/040419 JP2017040419W WO2018101002A1 WO 2018101002 A1 WO2018101002 A1 WO 2018101002A1 JP 2017040419 W JP2017040419 W JP 2017040419W WO 2018101002 A1 WO2018101002 A1 WO 2018101002A1
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WO
WIPO (PCT)
Prior art keywords
light receiving
infrared
detection area
detection
area
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Application number
PCT/JP2017/040419
Other languages
French (fr)
Japanese (ja)
Inventor
久也 小林
智宏 上津
橋本　裕介
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2018101002A1 publication Critical patent/WO2018101002A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers

Definitions

  • the present invention relates generally to an infrared detection device, and more particularly to an infrared detection device including a light receiving system that receives infrared light from a predetermined detection area.
  • Patent Document 1 a heat ray type human sensor that detects the presence or absence of a person in a predetermined detection area by detecting heat rays (infrared rays) emitted from a human body is known (Patent Document 1) ).
  • the hot-wire type human sensor described in Patent Document 1 includes a sensor element and a light receiving lens (hereinafter referred to as "multi-lens").
  • the sensor element detects the heat radiation emitted from the human body and generates an output according to the time change of the incident heat dose.
  • the multi-lens consists of an assembly of a large number of lens bodies (hereinafter referred to as "lens”) that cause heat rays in each area in the detection area to converge on the sensor element.
  • the multi-lens is formed in a hemispherical shape surrounding the light receiving surface of the sensor element.
  • the multiple lenses in the multi-lens are arranged in a triple circle, with 4 lenses on the innermost circle, 8 lenses on the next largest circle, and 12 on the outermost circle The lens is formed.
  • the heat dose incident on the sensor element through the lenses arranged on the outermost circle is the heat ray incident on the sensor element through the lenses arranged on the inner circle Less than amount. Therefore, in the above-mentioned hot-wire type human sensor, the sensitivity in the region corresponding to the lenses arranged on the outermost circle may be lowered.
  • An object of the present invention is to provide an infrared detection device capable of suppressing variation in sensitivity in a detection area.
  • the infrared detection device includes a light receiving system that receives infrared light from a predetermined detection area.
  • the light receiving system includes a plurality of light receiving units.
  • Each of the plurality of light receiving units includes an infrared light receiving element and a multi-lens.
  • the multi-lens has a plurality of lenses for condensing infrared light on the infrared light receiving element.
  • the predetermined detection area is a combined detection area of a plurality of detection areas.
  • Each of the plurality of detection areas is a combined small detection area of a plurality of small detection areas.
  • one small detection area of the plurality of small detection areas corresponds one to one.
  • small detection areas of two adjacent light reception units of the plurality of light reception units are mixed.
  • FIG. 1 is an exploded perspective view of an infrared detection device according to an embodiment of the present invention.
  • FIG. 2A is a perspective view from above of the infrared ray detection device of the same.
  • FIG. 2B is a perspective view of the lower side of the infrared detection device of the same.
  • FIG. 3A is a bottom view of a light receiving system in the above infrared detecting device.
  • FIG. 3B is a bottom view through the left half of the light receiving system in the above infrared detecting device.
  • FIG. 4 is a cross-sectional view of the above infrared detection device.
  • FIG. 5 is a perspective view of an infrared sensor including an infrared light receiving element in the above infrared detecting device.
  • FIG. 6A is a plan view of a light receiving system in the above infrared detecting device.
  • FIG. 6B is an explanatory diagram of a detection area of the above infrared detection device.
  • FIG. 7A is an explanatory view of a lens of a light receiving system in the above infrared detecting device.
  • FIG. 7B is an explanatory view of a detection area of the above infrared detection device.
  • FIG. 8 is an explanatory view of a small detection area in the detection area of the above infrared detection device.
  • FIG. 9 is a plan view for explaining the arrangement of lenses in the above infrared detection device.
  • FIG. 10A is an explanatory view of a lens of a light receiving system in the above infrared detecting device.
  • FIG. 10B is an explanatory diagram of the correspondence between the small detection area in the detection area of the infrared detection device and the lens of the light receiving system of the same.
  • each drawing described in the following embodiment is a schematic drawing, and the ratio of the size and thickness of each component in the drawing does not necessarily reflect the actual dimensional ratio. .
  • the infrared detection device 100 of the present embodiment is used, for example, for human body detection to detect the presence or absence of a person (detection target) in the predetermined detection area 11 (see FIGS. 4 and 6B). That is, the infrared detection device 100 is an infrared human-body detection device that detects a human body in the predetermined detection area 11.
  • the infrared detection device 100 includes a light receiving system 1 that receives infrared light from the predetermined detection area 11.
  • the light receiving system 1 includes a plurality of (five) light receiving units 2.
  • the plurality of light receiving units 2 are one first light receiving unit 2 a and a plurality of (four) second light receiving units 2 b.
  • the light receiving unit 2 includes an infrared sensor 3 having an infrared light receiving element 30 (see FIGS. 4 and 6A) and an optical member 6 having a multi-lens 5.
  • the multi-lens 5 has a plurality of lenses 50 for condensing infrared light on the infrared light receiving element 30.
  • the predetermined detection area 11 is a combined detection area of a plurality of (five) detection areas 12 (see FIGS. 4 and 6B) as many as the plurality of (five) light receiving units 2.
  • each of the plurality of detection areas 12 is a combined small detection area of the plurality of small detection areas 13 (see FIGS. 6B, 7B and 8).
  • the multi lens 5 in the first light receiving unit 2a has a plurality of (30) lenses 50 (see FIGS. 6A, 7A and 9).
  • each of the plurality of second light receiving units 2 b has a plurality of (15) lenses 50.
  • the multi lens 5 in the first light receiving unit 2a may be referred to as a first multi lens 5a
  • the lens 50 in the first light receiving unit 2a may be referred to as a first lens 50a.
  • the multi lens 5 in the second light receiving unit 2b may be referred to as a second multi lens 5b
  • the lens 50 in the second light receiving unit 2b may be referred to as a second lens 50b.
  • the optical member 6 including the first multi lens 5a may be referred to as a first optical member 6a
  • the optical member 6 including the second multi lens 5b may be referred to as a second optical member 6b
  • the infrared light receiving element 30 and the infrared sensor 3 of the first light receiving unit 2a may be referred to as a first infrared light receiving element 30a and a first infrared sensor 3a, respectively.
  • the infrared light receiving element 30 and the infrared sensor 3 of the second light receiving unit 2b may be referred to as a second infrared light receiving element 30b and a second infrared sensor 3b, respectively.
  • the infrared detection device 100 further includes a circuit board 7.
  • the first infrared sensor 3a and the plurality of second infrared sensors 3b are mounted on the circuit board 7.
  • the first infrared sensor 3a is mounted on the circuit board 7 such that the optical axis 39a (see FIG. 4) of the first infrared light receiving element 30a is substantially parallel to the thickness direction of the circuit board 7.
  • each of the plurality of (four) second infrared sensors 3b has the circuit board 7 so that the optical axis 39b (see FIG. 4) of the second infrared light receiving element 30b is inclined with respect to the thickness direction of the circuit board 7.
  • the plurality of second infrared sensors 3b are inclined in different directions.
  • the infrared detection device 100 further includes a base 8.
  • the base 8 holds the first light receiving unit 2 a, the plurality of second light receiving units 2 b, and the circuit board 7.
  • the relative position between the first infrared light receiving element 30a of the first infrared sensor 3a mounted on the circuit board 7 and the first multi-lens 5a is determined.
  • the infrared detection device 100 further includes a signal processing unit 9.
  • the signal processing unit 9 determines whether or not a person is present in the predetermined detection area 11 based on the output signals of the plurality of infrared light receiving elements 30.
  • the signal processing unit 9 is configured to output a determination result as to whether or not a person is present in the predetermined detection area 11 to an external device (external circuit).
  • the infrared detection device 100 includes the first infrared sensor 3 a, the plurality of second infrared sensors 3 b, the first multi lens 5 a, the plurality of second multi lenses 5 b, the circuit board 7, and the base 8. And the signal processing unit 9.
  • the optical axis 39a of the first infrared light receiving element 30a and the optical axis 39b of the second infrared light receiving element 30b are described without distinction, they are simply referred to as the optical axis 39 of the infrared light receiving element 30. .
  • the infrared sensor 3 has an infrared light receiving element 30.
  • the infrared light receiving element 30 is a thermal infrared detection element. More specifically, the infrared light receiving element 30 is a quad type pyroelectric element, and four detection units are arranged in a 2 ⁇ 2 array (matrix) in one pyroelectric substrate. Each of the four detection units includes a first electrode disposed on the first surface of the pyroelectric substrate, a second electrode disposed on the second surface opposite to the first surface, and pyroelectric It is a capacitor including the part between the 1st electrode and the 2nd electrode among body substrates.
  • the first electrode is composed of a conductive film (for example, a NiCr film) that absorbs infrared light.
  • the optical axis 39 of the infrared light receiving element 30 is a normal line erected at the center of a polygon (for example, a square) including the light receiving surface of each of the four detection portions when the infrared light receiving element 30 is viewed from one direction in the thickness direction. It is.
  • the infrared light receiving element 30 receives infrared light, and outputs a current signal according to the change in the amount of the received infrared light.
  • the infrared sensor 3 includes an IC (Integrated Circuit) element including a conversion circuit that converts a current signal output from the infrared light receiving element 30 into a voltage signal.
  • the conversion circuit includes, for example, a current-voltage conversion circuit and a voltage amplification circuit.
  • the current-voltage conversion circuit is a circuit that converts a current signal, which is an output signal output from the infrared light receiving element 30, into a voltage signal and outputs the voltage signal.
  • the voltage amplification circuit is a circuit that amplifies and outputs a voltage signal of a predetermined frequency band (for example, 0.1 Hz to 10 Hz) among voltage signals converted by the current-voltage conversion circuit.
  • the voltage amplification circuit has a function as a band pass filter.
  • the function as a band pass filter is a function of passing the component of the predetermined frequency band out of the voltage signal output from the current-voltage conversion circuit and removing an unnecessary frequency component which becomes noise.
  • the infrared sensor 3 includes a mounting substrate on which the infrared light receiving element 30 and the IC element are mounted.
  • the mounting substrate is, for example, a molded substrate.
  • the infrared sensor 3 also includes a package 33 (see FIG. 5) that accommodates a circuit module including the infrared light receiving element 30, the IC element, and the mounting substrate.
  • the package 33 is a so-called can package (Can Package).
  • the can package is also called a metal package (Metal Package).
  • the package 33 as shown in FIG. 5, includes a pedestal 331, a cap 332, a window member 333 and three lead terminals 334.
  • the pedestal 331 has conductivity.
  • the pedestal 331 is made of metal.
  • the pedestal 331 has a disk shape, and supports the mounting substrate on one side in the thickness direction.
  • the cap 332 is conductive.
  • the cap 332 is made of metal.
  • the cap 332 is cylindrical with a bottom, and is fixed to the pedestal 331 so as to cover the circuit module.
  • the window member 333 is an infrared transmitting member that transmits infrared light.
  • the window member 333 preferably has conductivity.
  • the window material 333 includes, for example, a silicon substrate.
  • the window member 333 preferably includes an infrared optical filter stacked on the silicon substrate in addition to the silicon substrate.
  • the infrared optical filter is an optical multilayer film that transmits infrared light in the wavelength region of the detection target of the infrared detection device 100.
  • the window member 333 is arranged to close the window hole 3322 formed in the front wall 3321 of the cap 332.
  • the window member 333 is bonded to the cap 332 by a conductive material, and is electrically connected to the cap 332.
  • the window member 333 is disposed in front of the light receiving surface of the infrared light receiving element 30.
  • the infrared light receiving element 30 it is preferable that the infrared light receiving element 30 be disposed so that the optical axis 39 of the infrared light receiving element 30 passes through the center of the window member 333.
  • the three lead terminals 334 are held by the pedestal 331. Each of the three lead terminals 334 is pin-shaped. Each of the three lead terminals 334 penetrates the pedestal 331 in the thickness direction of the pedestal 331.
  • the three lead terminals 334 are a power supply lead terminal, a signal output lead terminal, and a ground lead terminal.
  • the five infrared sensors 3 are mounted on a rectangular plate-shaped circuit board 7.
  • the circuit board 7 is, for example, a printed circuit board.
  • the circuit board 7 has a first surface 71 intersecting in the thickness direction, and a second surface 72 opposite to the first surface 71.
  • the four second infrared light receiving elements 30b are arranged on the first surface 71 side of the circuit board 7 so as to be arranged at substantially equal intervals on one virtual circle, and the first infrared light receiving element 30a Are arranged at the center of the above-mentioned imaginary circle.
  • the four second infrared light receiving elements 30b are disposed at four corners of the virtual square on the first surface 71 side of the circuit board 7, and the first infrared light reception is performed.
  • the element 30a is disposed at the center of the virtual square.
  • the optical axis 39 a (see FIG. 4) of the first infrared light receiving element 30 a is orthogonal to the first surface 71 of the circuit board 7.
  • the optical axis 39 b (see FIG. 4) in each of the plurality of second infrared light receiving elements 30 b intersects with the first surface 71 of the circuit board 7.
  • the angle between the normal line erected at the center of the virtual circle and the optical axis 39b of the second infrared light receiving element 30b is the same.
  • the plurality of second infrared sensors 3b are mounted on the circuit board 7 so that the optical axes 39b of the second infrared light receiving elements 30b are inclined in different directions with respect to the normal line erected at the center of the virtual circle. There is.
  • the circuit board 7 is provided with a plurality of sets (five sets) of three pin insertion holes 74 (see FIGS. 1 and 4) for passing the three lead terminals 334 in each of the plurality (five) infrared sensors 3 one by one. ing.
  • the circuit board 7 is disposed on the upper surface of the central portion 801 expanded upward in the disk-like base 8, and is held by the base 8.
  • the plurality of infrared sensors 3 mounted on the circuit board 7 are disposed on the lower surface side of the central portion 801 of the base 8.
  • the base 8 has electrical insulation.
  • the material of the base 8 is, for example, a synthetic resin.
  • the base 8 includes a first spacer portion 81a interposed between the first infrared sensor 3a and the circuit board 7, and a plurality of pedestals interposed between the pedestals 331 of the plurality of second infrared sensors 3b and the circuit board 7. And a second spacer portion 81b.
  • the first spacer portion 81a is formed with a plurality of holes 82a through which each of the three lead terminals 334 of the first infrared sensor 3a passes one by one.
  • the surface 811 a facing the pedestal 331 of the infrared sensor 3 is orthogonal to the optical axis 39 a of the first infrared light receiving element 30 a and parallel to the first surface 71 of the circuit board 7 .
  • the surface 811 b facing the pedestal 331 of the infrared sensor 3 is orthogonal to the optical axis 39 b of the second infrared light receiving element 30 b and with respect to the first surface 71 of the circuit board 7 Are inclined.
  • the infrared detection device 100 preferably further includes a plurality of (four) light blocking walls 83 (see FIG. 4).
  • Each of the plurality of light blocking walls 83 is semi-cylindrical.
  • Each of the plurality of light shielding walls 83 surrounds the pedestal 331 of the second infrared sensor 3b corresponding to one to one of the plurality of second infrared sensors 3b and the substantially half circumference of the cap 332, and the second infrared sensor 3b and the first infrared It is arranged between the sensor 3a.
  • the plurality of light shielding walls 83 may be integrally formed with the base 8 or may be separately formed and fixed to the base 8.
  • the base 8 includes four first walls 84 on the lower surface side of the central portion 801, in which the first optical member 6a is disposed.
  • each of the four first walls 84 has an arc shape, and is disposed at substantially equal intervals in the circumferential direction of the first optical member 6a.
  • the first optical member 6a is fixed to two first walls 84 of the four first walls 84 of the base 8 by two first screws (not shown).
  • the base 8 is provided with four second walls 85 on the lower surface side of the peripheral portion 802, in which each of the plurality of second optical members 6b is disposed.
  • Each of the four second walls 85 has a C shape in which the first optical member 6 a side is opened as viewed from the lower surface side of the base 8.
  • each of the plurality of second optical members 6b is fixed to the second wall 85 of the base 8 by two second screws (not shown).
  • the first optical member 6a has a bottomed cylindrical first optical member main body 60a and a first flange 62a projecting outward from the upper end of the first optical member main body 60a all around. And.
  • the first multi lens 5a is formed on the bottom wall 61a of the lower end of the first optical member main body 60a.
  • the first optical member 6 a is disposed such that the first flange 62 a overlaps the lower end surfaces of the four first walls 84 of the base 8.
  • each of the second optical members 6b has a box-shaped second optical member body 60b with a bottom and a second flange 62b protruding outward from the upper end of the second optical member body 60b.
  • the peripheral wall of the second optical member main body 60b has a C shape in which the first optical member 6a side is opened as viewed from the base 8 side.
  • the second multi lens 5b is formed on the bottom wall 61b of the lower end of the second optical member main body 60b.
  • the second optical member 6 b is disposed such that the second flange 62 b overlaps the lower end surface of the second wall 85 of the base 8.
  • a first surface 501a (see FIG. 4) to which infrared light from the outside (predetermined detection area 11) is incident is constituted by a group of incident surfaces of each of the plurality of first lenses 50a.
  • the second surface 502a (see FIG. 4) from which infrared light is emitted in the first multi-lens 5a is formed of a group of emission surfaces of the plurality of first lenses 50a.
  • Each of the plurality of first lenses 50a in the first multi lens 5a is a condensing lens, and is configured by a convex lens.
  • the convex lens which comprises each of the some 1st lens 50a is an aspherical lens from a viewpoint of making an aberration smaller.
  • the plurality of (30) first lenses 50a are divided into a plurality of (3) rows having different distances from the optical axis 39a of the first infrared light receiving element 30a.
  • the plurality of (30) first lenses 50a are on the first virtual circle C1, the second virtual circle C2 and the third virtual circle C3 having different radii. It is divided and arranged. The radiuses of the first virtual circle C1, the second virtual circle C2 and the third virtual circle C3 increase in this order.
  • the four first lenses 50a are arranged on the first virtual circle C1
  • the ten first lenses 50a are arranged on the second virtual circle C2
  • the third lenses are arranged on the third virtual circle C3.
  • Sixteen first lenses 50a are arranged.
  • the first multi lens 5a is preferably designed such that the focal points of the plurality of first lenses 50a on the side of the first infrared light receiving element 30a are at the same position.
  • the first multi-lens 5a is preferably configured such that the infrared rays transmitted through each of the plurality of first lenses 50a directly enter the window member 333 of the first infrared sensor 3a.
  • the infrared rays to be controlled by each of the plurality of first lenses 50a in the first multi-lens 5a are, for example, infrared rays in a wavelength range of 5 ⁇ m to 25 ⁇ m.
  • a first surface 501b (see FIG. 4) to which infrared light from the outside (predetermined detection area 11) is incident is constituted by a group of incident surfaces of each of the plurality of second lenses 50b.
  • the second surface 502b (see FIG. 4) from which infrared light is emitted in the second multi lens 5b is configured by a group of emission surfaces of the plurality of second lenses 50b.
  • Each of the plurality of second lenses 50b in the second multi lens 5b is a condensing lens, and is configured by a convex lens.
  • the convex lenses that constitute each of the plurality of second lenses 50b are aspheric lenses.
  • Each of the plurality of second lenses 50b is preferably a Fresnel lens from the viewpoint of reducing the thickness.
  • a plurality of (15) second lenses 50b are arranged in a plurality of (3) different rows from the optical axis 39a of the first infrared light receiving element 30a.
  • a plurality of (15) second lenses 50b are on the fourth virtual circle C4, the fifth virtual circle C5, and the sixth virtual circle C6 having mutually different radii. It is divided and arranged.
  • the radiuses of the fourth virtual circle C4, the fifth virtual circle C5, and the sixth virtual circle C6 increase in this order.
  • the radius of the fourth virtual circle C4 is larger than the radius of the third virtual circle C3.
  • the centers of the first virtual circle C1 to the sixth virtual circle C6 are the same.
  • the second multi-lens 5b five second lenses 50b are arranged on the fourth virtual circle C4, and seven second lenses 50b are arranged on the fifth virtual circle C5, and on the sixth virtual circle C6. Three second lenses 50b are arranged.
  • the first virtual circle C1 to the sixth virtual circle C1 to the sixth virtual circle 50 can be seen from the second to third second lenses 50b arranged in the one radial direction common to the first virtual circle C1 to the sixth virtual circle C6.
  • the lens area is larger as the second lens 50b is farther from the center common to the circle C6.
  • the second multi lens 5 b is preferably designed such that the focal points of the plurality of second lenses 50 b on the side of the second infrared light receiving element 30 b are at the same position.
  • the second multi lens 5b is preferably configured such that the infrared rays transmitted through each of the plurality of second lenses 50b directly enter the window member 333 of the second infrared sensor 3b.
  • the infrared rays to be controlled by each of the plurality of second lenses 50b in the second multi-lens 5b are, for example, infrared rays in a wavelength range of 5 ⁇ m to 25 ⁇ m.
  • the material of the first multi-lens 5a and the second multi-lens 5b is, for example, polyethylene. More specifically, the material of the first multi-lens 5a is polyethylene to which a white pigment or a black pigment is added. As the white pigment, for example, it is preferable to use an inorganic pigment such as titanium oxide. As the black pigment, for example, fine particles of carbon black or the like are preferably employed.
  • the first multi lens 5a and the second multi lens 5 b can be formed, for example, by a molding method. As a molding method, an injection molding method, a compression molding method, etc. are employable, for example.
  • the infrared detection device 100 is disposed on a ceiling or the like so that the center line 110 (see FIG. 4) of the predetermined detection area 11 is directed vertically downward.
  • the infrared detection device 100 is arranged such that the light receiving surface of the first infrared light receiving element 30a is directed vertically downward in one usage pattern.
  • the predetermined detection area 11 is a square pyramidal three-dimensional area.
  • the predetermined detection area 11 is square in a horizontal plane orthogonal to the center line 110.
  • the solid angle of the predetermined detection area 11 of the infrared detection device 100 is defined by the first light receiving unit 2a and the plurality of second light receiving units 2b.
  • each of the plurality of (90) small detection areas 13 (see FIGS. 6B, 7B and 8) dividing the predetermined detection area 11 is the first light receiving unit 2a and the plurality of (four) second light receptions. It is associated with one of the units 2b.
  • FIG. 6B is a view schematically representing the predetermined detection area 11 of the infrared detection device 100 in a virtual plane 120 (for example, a floor surface) orthogonal to the center line 110 of the predetermined detection area 11.
  • FIG. 120 for example, a floor surface
  • the predetermined detection area 11 includes 90 small detection areas 13.
  • Each of the plurality of (90) small detection areas 13 includes a plurality of (four) minute detection areas 14 (see FIG. 8) corresponding to the plurality of (four) detection portions of the infrared light receiving element 30 one by one. It is.
  • the plurality of minute detection areas 14 are in different directions as viewed from the infrared light receiving element 30.
  • Each of the plurality of minute detection areas 14 has an oblique square pyramid shape. The solid angle of each of the plurality of minute detection areas 14 is smaller than the solid angle of the small detection area 13.
  • the minute detection area 14 is narrower than the small detection area 13.
  • the minute detection area 14 is a three-dimensional area formed when the infrared ray bundle incident on the detection portion of the first infrared light receiving element 30a through the first lens 50a is extended in the direction opposite to the advancing direction of the infrared rays, or the second lens This is a three-dimensional area formed when the infrared ray bundle incident on the detection portion of the second infrared light receiving element 30b through 50b is extended in the direction opposite to the advancing direction of the infrared ray.
  • the minute detection area 14 is a three-dimensional area through which an infrared ray bundle used to form an image on the light receiving surface of the detection unit of the infrared light receiving element 30 can pass.
  • the minute detection area 14 can be estimated, for example, by the result of simulation using ray tracing analysis software.
  • Each of the plurality of minute detection areas 14 can be regarded as having a polarity corresponding to the first electrode of the detection unit in a one-to-one manner.
  • the predetermined detection area 11, each small detection area 13, and each minute detection area 14 are optically defined three-dimensional areas, not actually visible three-dimensional areas.
  • the small detection area 13 may also depend on the size and shape of the window member 333 of the infrared sensor 3 (see FIG. 5), the opening shape of the window hole 3322 and the like.
  • one small detection area 13 of the plurality of (90) small detection areas 13 is associated with each of the plurality of (30) first lenses 50a of the first light receiving unit 2a. There is. In other words, 30 small detection areas 13 out of 90 small detection areas 13 are associated with the first light receiving unit 2a. Further, in the infrared detection device 100, one of the plurality (90) of the small detection areas 13 is provided for each of the plurality of (15) second lenses 50b of each of the plurality of (four) second light receiving units 2b. The small detection area 13 is associated. In other words, 15 small detection areas 13 out of 90 small detection areas 13 are associated with each of the four second light receiving units 2b. That is, in the infrared detection device 100, the small detection area 13 in which the number (30) of the small detection areas 13 associated with the first light receiving unit 2a is associated with each of the plurality of second light receiving units 2b. More than the number of (15).
  • the infrared detection device 100 includes the signal processing unit 9 that determines whether or not a person is present in the predetermined detection area 11 based on the output signal of each of the plurality of infrared light receiving elements 30.
  • the signal processing unit 9 performs, for example, synchronous detection for extracting the synchronous component of the output signal of each of the plurality of infrared light receiving elements 30, and based on the result of synchronous detection, whether or not a person exists in the predetermined detection area 11 judge.
  • the signal processing unit 9 can be configured using, for example, a multiplier for performing synchronous detection, a comparator, and the like.
  • the component parts of the signal processing unit 9 are mounted on the circuit board 7.
  • the component parts of the signal processing unit 9 are disposed on the second surface 72 side of the circuit board 7.
  • the signal processing unit 9 may include an IC element in each of the plurality of infrared sensors 3 described above.
  • the predetermined detection area 11 is divided into a central area 11a and a peripheral area 11b.
  • the central area 11 a corresponds to the first light receiving unit 2 a, and includes 30 small detection areas 13 out of 90 small detection areas 13.
  • the peripheral area 11 b corresponds to the plurality of second light receiving units 2 b, and includes 60 small detection areas 13 out of 90 small detection areas 13.
  • the central area 11a is a circular area on the virtual plane 120 as shown in FIG. 6B.
  • the peripheral area 11b is, as shown in FIG.
  • the four second light receiving units 2b are arranged to have four-fold rotational symmetry about the center line 110 of the predetermined detection area 11 (see FIGS. 3A and 3B).
  • the predetermined detection area 11 is a combined detection area of a plurality (five) of detection areas 12 (see FIGS. 6B and 7B).
  • Each of the plurality (five) of detection areas 12 is a combined small detection area of the plurality of small detection areas 13.
  • the plurality of (five) detection areas 12 include one first detection area 12 a and a plurality of (four) second detection areas 12 b.
  • the first detection area 12a is the same area as the central area 11a.
  • Each of the plurality of second detection areas 12b is one of a plurality of areas obtained by equally dividing the peripheral area 11b by the number of second light receiving units 2b in the outer peripheral direction of the central area 11a. That is, each of the four second detection areas 12b is one of a plurality of areas obtained by dividing the peripheral area 11b into four.
  • the shapes of the plurality of second detection areas 12 b are substantially the same.
  • one small detection area 13 of the plurality of small detection areas 13 corresponds to each other for each of the plurality of lenses 50 of each of the plurality of light receiving units 2.
  • small detection areas 13 of two adjacent light reception units 2 (second light reception units 2b) of the plurality of light reception units 2 are provided. It is mixed. This point will be supplementarily described with reference to FIGS. 7A and 7B. In FIGS.
  • the upper right second detection area 12b includes A11 to A14, A22 to A26, A31 to A33, and B15 and B27.
  • the lower right second detection area 12b includes B11 to B14, B22 to B26, B31 to B33, and A21.
  • the small detection areas 13 of the two light receiving units 2 are alternately arranged in the circumferential direction of the predetermined detection area 11.
  • A31, B27, A22, B26, A21 and B25 are arranged in this order in the circumferential direction of the predetermined detection area 11.
  • the small detection areas 13 of the two adjacent second light reception units 2b of the plurality of light reception units 2 are mixed.
  • not all of the fifteen second lenses 50b in each of the four second light receiving units 2b correspond to only one second detection area 12b, but at least two of them. It corresponds to the second detection area 12b.
  • the number and the arrangement of the small detection areas 13 in the detection area 12 can be changed by appropriately designing the number, the shape, the arrangement, and the like of the lenses 50 of the multilens 5.
  • the number of small detection areas 13 corresponding to one second light receiving unit 2b can be reduced in each of the plurality of second detection areas 12b. Therefore, in the infrared detection device 100, it is possible to suppress an increase in the distance between the adjacent small detection areas 13 while increasing the lens area of the second lens 50b of the second light receiving unit 2b. Therefore, in the infrared detection device 100, it is possible to suppress the variation in sensitivity in the predetermined detection area 11.
  • the infrared detection device 100 there is a single detection area 121 in each of the four second detection areas 12b.
  • the single detection area 121 is smaller than the detection area 12 in a plane orthogonal to the center line 110 of the predetermined detection area 11.
  • the single detection area 121 is larger than one small detection area 13 of the 15 small detection areas 13 in the second detection area 12 b and includes less than 15 small detection areas 13.
  • the single detection area 121 includes only the small detection area 13 of one light receiving unit 2 in two adjacent light receiving units 2 among the plurality of light receiving units 2 and does not include the small detection area 13 of the other light receiving unit 2.
  • the predetermined detection area 11 is a square pyramidal area.
  • the infrared detection device 100 there is an individual detection area 121 at each of four corners of the predetermined detection area 11 in a plane orthogonal to the center line 110 of the predetermined detection area 11.
  • the single detection area 121 of the upper right second detection area 12b in FIG. 7B includes nine small detection areas 13 corresponding to A12 to A14, A23 to A25, and A31 to A33.
  • the single detection area 121 in the lower right second detection area 12b in FIG. 7B includes eight small detection areas 13 corresponding to B12, B13, B23 to B25, and B31 to B33.
  • the number of detection areas 12 in which the small detection areas 13 of the two adjacent light receiving units 2 are mixed is not limited to four, and may be at least two. Further, the small detection areas 13 of the first light receiving unit 2a and the second light receiving unit 2b adjacent to each other may be mixed in each of the first detection area 12a and the second detection area 12b.
  • the four second light receiving units 2b are disposed so as to surround the first light receiving unit 2a around the center line 110 of the predetermined detection area 11.
  • the present invention is not limited to this. It is preferable that the second light receiving unit 2b be disposed so as to surround the first light receiving unit 2a.
  • each 2nd detection area 12b of several 2nd light reception unit 2b is It may be wider toward the center line 110 of the predetermined detection area 11.
  • the infrared detection device 100 described above includes the light receiving system 1 that receives infrared light from the predetermined detection area 11.
  • the light receiving system 1 includes a plurality of light receiving units 2.
  • Each of the plurality of light receiving units 2 includes an infrared light receiving element 30 and a multi-lens 5.
  • the multi-lens 5 has a plurality of lenses 50 for condensing infrared light on the infrared light receiving element 30.
  • the predetermined detection area 11 is a combined detection area of a plurality of detection areas 12.
  • Each of the plurality of detection areas 12 is a combined small detection area of the plurality of small detection areas 13.
  • one small detection area 13 of the plurality of small detection areas 13 corresponds one to one.
  • the small detection areas 13 of two adjacent light reception units 2 of the plurality of light reception units 2 are mixed.
  • the infrared detection device 100 can suppress variations in sensitivity in the predetermined detection area 11.
  • the infrared detection device 100 in at least two detection areas 12 among the plurality of detection areas 12, the small detection areas 13 of the two adjacent light reception units 2 among the plurality of light reception units 2 are mixed. Therefore, the lens area of the lens 50 relatively far from the center line 110 of the predetermined detection area 11 among the plurality of lenses 50 of each of the two adjacent light reception units 2 can be made larger, and within the predetermined detection area 11 It is possible to further shorten the distance between adjacent small detection areas 13.
  • the infrared detection device 100 it is possible to suppress the variation in sensitivity in the predetermined detection area 11. In short, in the infrared detection device 100, it is possible to make the sensitivity in the predetermined detection area 11 uniform.
  • the infrared detection device 100 performs predetermined detection as compared with the case where the predetermined detection area is expanded by increasing the diameter of the hemispherical multi-lens and increasing the number of rows in which the lenses are arranged in the heat ray type human sensor described above. It is possible to suppress a decrease in sensitivity on the outermost peripheral side of the area 11. In other words, the infrared detection device 100 can suppress the decrease in sensitivity on the outermost side of the predetermined detection area 11 while increasing the viewing angle, and the inside of the predetermined detection area 11 while increasing the viewing angle. It is possible to suppress variations in sensitivity.
  • the “viewing angle” means the spread angle of the predetermined detection area 11 of the infrared detection device 100.
  • the small detection areas 13 of the two light receiving units 2 are alternately arranged in the circumferential direction of the predetermined detection area 11.
  • the infrared detection device 100 it is possible to widen the width of the lens 50 relatively far from the center line 110 of the predetermined detection area 11 in the direction along the circumferential direction of the predetermined detection area 11, thereby enlarging the lens area
  • the infrared detection device 100 can be miniaturized.
  • the lens 50 relatively far from the center line 110 of the predetermined detection area 11 is, for example, the plurality of lenses 50 arranged on the fifth virtual circle C5 described with reference to FIG. It is a plurality of lenses 50 grade arranged on circle C6.
  • the plurality of lenses 50 arranged on the fifth virtual circle C5 can increase the width of the fifth virtual circle C5 in the circumferential direction. Further, the plurality of lenses 50 arranged on the sixth virtual circle C6 can increase the width of the sixth virtual circle C6 in the circumferential direction.
  • the plurality of light receiving units 2 preferably include at least three light receiving units 2 disposed around the center line 110 of the predetermined detection area 11.
  • at least three light receiving units 2 be arranged to have n-fold rotational symmetry centering on the center line 110 of the predetermined detection area 11 when an integer n of 2 or more is used.
  • the infrared detection device 100 can make the predetermined detection area 11 wider.
  • the detection area 12 is smaller than the detection area 12 in a plane orthogonal to the center line 110 of the predetermined detection area 11 and is smaller than one small detection area 13 of the plurality of small detection areas 13.
  • the single detection area 121 includes only the small detection area 13 of one light receiving unit 2 in two adjacent light receiving units 2 among the plurality of light receiving units 2 and does not include the small detection area 13 of the other light receiving unit 2 .
  • the infrared ray shielding member is, for example, a seal that shields infrared rays, a resin molded member that shields infrared rays, or the like.
  • the predetermined detection area 11 is a quadrangular pyramid area, and there is an independent detection area 121 at each of the four corners of the predetermined detection area 11 in a plane orthogonal to the center line 110 of the predetermined detection area 11. preferable.
  • the shape of the predetermined detection area 11 of the infrared detection device 100 can be easily changed.
  • the user places two adjacent single detection areas 121 of the four individual detection areas 121, one at each of the four corners of the predetermined detection area 11, A case will be described in which a band-like area including all of the plurality of small detection areas 13 between two matching single detection areas 121 is used as a non-detection area.
  • it is determined by hiding the plurality of second lenses 50b on the outer peripheral side of each of the two adjacent second light receiving units 2b by a band-like infrared light shielding member whose longitudinal direction is a direction along the non-detection area. It is possible to change the shape of the detection area 11.
  • hatching of dots is given to a region hidden by the infrared ray shielding member in the optical member 6 including the multi-lens 5, and in FIG. 10B, the infrared ray shielding member is provided to provide the predetermined detection area 11 Of these areas, areas that become non-detection areas are hatched with dots.
  • These hatchings do not represent cross sections, and are merely provided to simplify the description.
  • the infrared light receiving element 30 is preferably a pyroelectric element.
  • the infrared detection device 100 can more easily detect the movement of an object (for example, a human body) that emits infrared light, as compared to the case where the infrared light receiving element 30 is a thermopile, a resistance bolometer, or the like.
  • the infrared detection device 100 preferably further includes a signal processing unit 9.
  • the signal processing unit 9 determines whether or not a person exists in the predetermined detection area 11 based on the output signal of each of the plurality of infrared light receiving elements 30.
  • the infrared detection device 100 can be used as a human body detection device.
  • the infrared light receiving element 30 described above is not limited to the quad type pyroelectric element, but may be, for example, a dual type pyroelectric element, a single type pyroelectric element, or the like. Further, the shape, the arrangement, and the like of the detection unit in the pyroelectric element are not particularly limited.
  • the pyroelectric element may have a configuration in which four detection units are arranged in a 1 ⁇ 4 array on one pyroelectric substrate. In this case, the plan view shape of each of the four detection units is a rectangle. Further, adjacent detection units are connected in reverse parallel.
  • the pyroelectric element is not limited to the configuration provided with the pyroelectric substrate, and for example, the back electrode, the pyroelectric thin film, and the surface electrode are arranged in this order on the electrical insulating film on the surface of the silicon substrate. It may be a chip on which a detection unit is formed. Such a chip can be formed, for example, using micromachining technology and pyroelectric thin film forming technology.
  • the infrared detection device 100 is not limited to human body detection, and may be used in other applications such as gas detection.
  • the infrared detection device 100 can be used for, for example, a wiring apparatus, an apparatus, and the like.
  • the devices include, for example, lighting fixtures, lighting devices, televisions, personal computers, air conditioners, humidifiers, refrigerators, copy machines, digital signage, digital photo frames, urinals, vending machines, ticket vending machines, automatic teller machines, There are gas sensors, gas analyzers, etc.

Abstract

The present invention addresses the problem of providing an infrared detection device whereby unevenness of sensitivity in a sensing area can be suppressed. Each of a plurality of light receiving units (2) in a light receiving system (1) includes an infrared light receiving element (30) and a multilens (5). The multilens (5) has a plurality of lenses (50). A predetermined sensing area (11) is a synthetic sensing area of a plurality of sensing areas (12). Each of the plurality of sensing areas (12) is a synthetic small sensing area of a plurality of small sensing areas (13). Each of the plurality of lenses (50) of each of the plurality of light receiving units (2) corresponds one-to-one with a single small sensing area (13) among the plurality of small sensing areas (13). In at least two sensing areas (12) among the plurality of sensing areas (12), the small sensing areas (13) of each of two adjacent light receiving units (2) among the plurality of light receiving units (2) are intermingled.

Description

赤外線検出装置Infrared detector
　本発明は、一般に赤外線検出装置に関し、より詳細には、所定検知エリアからの赤外線を受光する受光系を備える赤外線検出装置に関する。 The present invention relates generally to an infrared detection device, and more particularly to an infrared detection device including a light receiving system that receives infrared light from a predetermined detection area.
　従来、赤外線検出装置としては、例えば、人体から放射される熱線（赤外線）を検出することによって所定の検知エリア内の人の存否を検出する熱線式人感センサが知られている（特許文献１）。 Conventionally, as an infrared detection device, for example, a heat ray type human sensor that detects the presence or absence of a person in a predetermined detection area by detecting heat rays (infrared rays) emitted from a human body is known (Patent Document 1) ).
　特許文献１に記載された熱線式人感センサは、センサ素子と、受光レンズ（以下、「マルチレンズ」という）と、を備える。センサ素子は、人体から放射される熱線を検出するとともに入射する熱線量の時間変化に応じた出力を発生する。マルチレンズは、検知エリア内の各領域ごとの熱線をセンサ素子に収束させる多数個のレンズ小体（以下、「レンズ」という）の集合体からなる。 The hot-wire type human sensor described in Patent Document 1 includes a sensor element and a light receiving lens (hereinafter referred to as "multi-lens"). The sensor element detects the heat radiation emitted from the human body and generates an output according to the time change of the incident heat dose. The multi-lens consists of an assembly of a large number of lens bodies (hereinafter referred to as "lens") that cause heat rays in each area in the detection area to converge on the sensor element.
　マルチレンズは、センサ素子の受光面を囲む半球状に形成されている。マルチレンズにおける多数個のレンズは、３重円状に配列され、最も内側の円上には４個のレンズ、次に大きい円上には８個のレンズ、最も外側の円上には１２個のレンズが形成されている。 The multi-lens is formed in a hemispherical shape surrounding the light receiving surface of the sensor element. The multiple lenses in the multi-lens are arranged in a triple circle, with 4 lenses on the innermost circle, 8 lenses on the next largest circle, and 12 on the outermost circle The lens is formed.
　上述の熱線式人感センサでは、最も外側の円上に配列されたレンズを通ってセンサ素子に入射する熱線量が、その内側の円上に配列されたレンズを通ってセンサ素子に入射する熱線量よりも少なくなる。そのため、上述の熱線式人感センサでは、最も外側の円上に配列されたレンズに対応する領域での感度が低下してしまうことがある。 In the heat ray type human sensor described above, the heat dose incident on the sensor element through the lenses arranged on the outermost circle is the heat ray incident on the sensor element through the lenses arranged on the inner circle Less than amount. Therefore, in the above-mentioned hot-wire type human sensor, the sensitivity in the region corresponding to the lenses arranged on the outermost circle may be lowered.
特開２０００－１３１１３６号公報Japanese Patent Laid-Open No. 2000-131136
　本発明の目的は、検知エリア内の感度のばらつきを抑制することが可能な赤外線検出装置を提供することにある。 An object of the present invention is to provide an infrared detection device capable of suppressing variation in sensitivity in a detection area.
　本発明に係る一態様の赤外線検出装置は、所定検知エリアからの赤外線を受光する受光系を備える。前記受光系は、複数の受光ユニットを備える。前記複数の受光ユニットの各々は、赤外線受光素子と、マルチレンズと、を含む。前記マルチレンズは、前記赤外線受光素子に赤外線を集光する複数のレンズを有する。前記所定検知エリアは、複数の検知エリアの合成検知エリアである。前記複数の検知エリアの各々は、複数の小検知エリアの合成小検知エリアである。前記複数の受光ユニットそれぞれの前記複数のレンズの各々について、前記複数の小検知エリアのうちの１つの小検知エリアが一対一に対応している。前記複数の検知エリアのうち少なくとも２つの検知エリアには、前記複数の受光ユニットのうち隣り合う２つの受光ユニットそれぞれの小検知エリアが混在している。 The infrared detection device according to one aspect of the present invention includes a light receiving system that receives infrared light from a predetermined detection area. The light receiving system includes a plurality of light receiving units. Each of the plurality of light receiving units includes an infrared light receiving element and a multi-lens. The multi-lens has a plurality of lenses for condensing infrared light on the infrared light receiving element. The predetermined detection area is a combined detection area of a plurality of detection areas. Each of the plurality of detection areas is a combined small detection area of a plurality of small detection areas. For each of the plurality of lenses of each of the plurality of light receiving units, one small detection area of the plurality of small detection areas corresponds one to one. In at least two detection areas of the plurality of detection areas, small detection areas of two adjacent light reception units of the plurality of light reception units are mixed.
図１は、本発明の一実施形態に係る赤外線検出装置の分解斜視図である。FIG. 1 is an exploded perspective view of an infrared detection device according to an embodiment of the present invention. 図２Ａは、同上の赤外線検出装置の上側から見た斜視図である。図２Ｂは、同上の赤外線検出装置の下側から見た斜視図である。FIG. 2A is a perspective view from above of the infrared ray detection device of the same. FIG. 2B is a perspective view of the lower side of the infrared detection device of the same. 図３Ａは、同上の赤外線検出装置における受光系の下面図である。図３Ｂは、同上の赤外線検出装置における受光系に関し、左半分を透視した下面図である。FIG. 3A is a bottom view of a light receiving system in the above infrared detecting device. FIG. 3B is a bottom view through the left half of the light receiving system in the above infrared detecting device. 図４は、同上の赤外線検出装置の断面図である。FIG. 4 is a cross-sectional view of the above infrared detection device. 図５は、同上の赤外線検出装置における赤外線受光素子を含む赤外線センサの斜視図である。FIG. 5 is a perspective view of an infrared sensor including an infrared light receiving element in the above infrared detecting device. 図６Ａは、同上の赤外線検出装置における受光系の平面図である。図６Ｂは、同上の赤外線検出装置の検知エリアの説明図である。FIG. 6A is a plan view of a light receiving system in the above infrared detecting device. FIG. 6B is an explanatory diagram of a detection area of the above infrared detection device. 図７Ａは、同上の赤外線検出装置における受光系のレンズの説明図である。図７Ｂは、同上の赤外線検出装置の検知エリアの説明図である。FIG. 7A is an explanatory view of a lens of a light receiving system in the above infrared detecting device. FIG. 7B is an explanatory view of a detection area of the above infrared detection device. 図８は、同上の赤外線検出装置の検知エリアにおける小検知エリアの説明図である。FIG. 8 is an explanatory view of a small detection area in the detection area of the above infrared detection device. 図９は、同上の赤外線検出装置におけるレンズの配置を説明するための平面図である。FIG. 9 is a plan view for explaining the arrangement of lenses in the above infrared detection device. 図１０Ａは、同上の赤外線検出装置における受光系のレンズの説明図である。図１０Ｂは、同上の赤外線検出装置の検知エリアにおける小検知エリアと受光系のレンズとの対応関係の説明図である。FIG. 10A is an explanatory view of a lens of a light receiving system in the above infrared detecting device. FIG. 10B is an explanatory diagram of the correspondence between the small detection area in the detection area of the infrared detection device and the lens of the light receiving system of the same.
　以下に説明する実施形態は、本発明の様々な実施形態の一つに過ぎない。下記の実施形態は、本発明の目的を達成できれば、設計等に応じて種々の変更が可能である。 The embodiments described below are only one of various embodiments of the present invention. The following embodiments can be variously modified according to the design and the like as long as the object of the present invention can be achieved.
　また、下記の実施形態において説明する各図は、模式的な図であり、図中の各構成要素の大きさや厚さそれぞれの比が、必ずしも実際の寸法比を反映しているとは限らない。 Further, each drawing described in the following embodiment is a schematic drawing, and the ratio of the size and thickness of each component in the drawing does not necessarily reflect the actual dimensional ratio. .
　（実施形態）
　以下では、本実施形態の赤外線検出装置１００について、図１～９に基づいて説明する。 (Embodiment)
Hereinafter, the infrared detection device 100 according to the present embodiment will be described based on FIGS.
　本実施形態の赤外線検出装置１００は、一例として、所定検知エリア１１（図４及び６Ｂ参照）内の人（検知対象）の存否を検知する人体検知に用いられる。つまり、赤外線検出装置１００は、所定検知エリア１１内の人体検知を行う赤外線式人体検知装置である。 The infrared detection device 100 of the present embodiment is used, for example, for human body detection to detect the presence or absence of a person (detection target) in the predetermined detection area 11 (see FIGS. 4 and 6B). That is, the infrared detection device 100 is an infrared human-body detection device that detects a human body in the predetermined detection area 11.
　赤外線検出装置１００は、所定検知エリア１１からの赤外線を受光する受光系１を備える。受光系１は、複数（５個）の受光ユニット２を備える。複数の受光ユニット２は、１個の第１受光ユニット２ａ及び複数（４個）の第２受光ユニット２ｂである。受光ユニット２は、赤外線受光素子３０（図４及び６Ａ参照）を有する赤外線センサ３と、マルチレンズ５を有する光学部材６と、を含む。マルチレンズ５は、赤外線受光素子３０に赤外線を集光する複数のレンズ５０を有する。所定検知エリア１１は、複数（５個）の受光ユニット２と同数の複数（５個）の検知エリア１２（図４及び６Ｂ参照）の合成検知エリアである。ここにおいて、複数の検知エリア１２の各々は、複数の小検知エリア１３（図６Ｂ、７Ｂ及び８参照）の合成小検知エリアである。本実施形態の赤外線検出装置１００では、中心線１１０に直交する面内において、複数のマルチレンズ５それぞれの形状に対応する複数の検知エリア１２がある。 The infrared detection device 100 includes a light receiving system 1 that receives infrared light from the predetermined detection area 11. The light receiving system 1 includes a plurality of (five) light receiving units 2. The plurality of light receiving units 2 are one first light receiving unit 2 a and a plurality of (four) second light receiving units 2 b. The light receiving unit 2 includes an infrared sensor 3 having an infrared light receiving element 30 (see FIGS. 4 and 6A) and an optical member 6 having a multi-lens 5. The multi-lens 5 has a plurality of lenses 50 for condensing infrared light on the infrared light receiving element 30. The predetermined detection area 11 is a combined detection area of a plurality of (five) detection areas 12 (see FIGS. 4 and 6B) as many as the plurality of (five) light receiving units 2. Here, each of the plurality of detection areas 12 is a combined small detection area of the plurality of small detection areas 13 (see FIGS. 6B, 7B and 8). In the infrared detection device 100 of the present embodiment, there are a plurality of detection areas 12 corresponding to the shapes of the plurality of multi lenses 5 in a plane orthogonal to the center line 110.
　第１受光ユニット２ａにおけるマルチレンズ５は、複数（３０個）のレンズ５０（図６Ａ、７Ａ及び９参照）を有する。また、複数の第２受光ユニット２ｂの各々は、複数（１５個）のレンズ５０を有する。以下、第１受光ユニット２ａにおけるマルチレンズ５を第１マルチレンズ５ａと称し、第１受光ユニット２ａにおけるレンズ５０を第１レンズ５０ａと称することもある。また、第２受光ユニット２ｂにおけるマルチレンズ５を第２マルチレンズ５ｂと称し、第２受光ユニット２ｂにおけるレンズ５０を第２レンズ５０ｂと称することもある。また、第１マルチレンズ５ａを含む光学部材６を第１光学部材６ａと称し、第２マルチレンズ５ｂを含む光学部材６を第２光学部材６ｂと称することもある。また、第１受光ユニット２ａの赤外線受光素子３０及び赤外線センサ３を、それぞれ、第１赤外線受光素子３０ａ及び第１赤外線センサ３ａと称することもある。また、第２受光ユニット２ｂの赤外線受光素子３０及び赤外線センサ３を、それぞれ、第２赤外線受光素子３０ｂ及び第２赤外線センサ３ｂと称することもある。 The multi lens 5 in the first light receiving unit 2a has a plurality of (30) lenses 50 (see FIGS. 6A, 7A and 9). In addition, each of the plurality of second light receiving units 2 b has a plurality of (15) lenses 50. Hereinafter, the multi lens 5 in the first light receiving unit 2a may be referred to as a first multi lens 5a, and the lens 50 in the first light receiving unit 2a may be referred to as a first lens 50a. The multi lens 5 in the second light receiving unit 2b may be referred to as a second multi lens 5b, and the lens 50 in the second light receiving unit 2b may be referred to as a second lens 50b. The optical member 6 including the first multi lens 5a may be referred to as a first optical member 6a, and the optical member 6 including the second multi lens 5b may be referred to as a second optical member 6b. The infrared light receiving element 30 and the infrared sensor 3 of the first light receiving unit 2a may be referred to as a first infrared light receiving element 30a and a first infrared sensor 3a, respectively. Also, the infrared light receiving element 30 and the infrared sensor 3 of the second light receiving unit 2b may be referred to as a second infrared light receiving element 30b and a second infrared sensor 3b, respectively.
　また、赤外線検出装置１００は、回路基板７を更に備える。赤外線検出装置１００では、回路基板７に、第１赤外線センサ３ａ及び複数の第２赤外線センサ３ｂが実装されている。ここにおいて、第１赤外線センサ３ａは、第１赤外線受光素子３０ａの光軸３９ａ（図４参照）が回路基板７の厚さ方向と略平行となるように、回路基板７に実装されている。また、複数（４個）の第２赤外線センサ３ｂの各々は、第２赤外線受光素子３０ｂの光軸３９ｂ（図４参照）が回路基板７の厚さ方向に対して傾くように、回路基板７に実装されている。複数の第２赤外線センサ３ｂは、互いに異なる向きに傾いている。 The infrared detection device 100 further includes a circuit board 7. In the infrared detection device 100, the first infrared sensor 3a and the plurality of second infrared sensors 3b are mounted on the circuit board 7. Here, the first infrared sensor 3a is mounted on the circuit board 7 such that the optical axis 39a (see FIG. 4) of the first infrared light receiving element 30a is substantially parallel to the thickness direction of the circuit board 7. In addition, each of the plurality of (four) second infrared sensors 3b has the circuit board 7 so that the optical axis 39b (see FIG. 4) of the second infrared light receiving element 30b is inclined with respect to the thickness direction of the circuit board 7. Has been implemented. The plurality of second infrared sensors 3b are inclined in different directions.
　また、赤外線検出装置１００は、ベース８を更に備える。ベース８は、第１受光ユニット２ａと複数の第２受光ユニット２ｂと回路基板７とを保持する。これにより、赤外線検出装置１００では、回路基板７に実装されている第１赤外線センサ３ａの第１赤外線受光素子３０ａと第１マルチレンズ５ａとの相対的な位置が決まる。また、赤外線検出装置１００では、回路基板７に実装されている複数の第２赤外線センサ３ｂそれぞれの第２赤外線受光素子３０ｂと複数の第２マルチレンズ５ｂのうち一対一に対応する第２マルチレンズ５ｂとの相対的な位置が決まる。 In addition, the infrared detection device 100 further includes a base 8. The base 8 holds the first light receiving unit 2 a, the plurality of second light receiving units 2 b, and the circuit board 7. Thus, in the infrared detection device 100, the relative position between the first infrared light receiving element 30a of the first infrared sensor 3a mounted on the circuit board 7 and the first multi-lens 5a is determined. Further, in the infrared detection device 100, a second multi lens corresponding to one to one of the second infrared light receiving elements 30b of the plurality of second infrared sensors 3b mounted on the circuit board 7 and the plurality of second multi lenses 5b. The relative position with 5b is determined.
　また、赤外線検出装置１００は、信号処理部９を更に備える。信号処理部９は、複数の赤外線受光素子３０の出力信号に基づいて所定検知エリア１１に人が存在するか否かを判定する。信号処理部９は、所定検知エリア１１に人が存在するか否かの判定結果を外部装置（外部回路）へ出力するように構成されている。 The infrared detection device 100 further includes a signal processing unit 9. The signal processing unit 9 determines whether or not a person is present in the predetermined detection area 11 based on the output signals of the plurality of infrared light receiving elements 30. The signal processing unit 9 is configured to output a determination result as to whether or not a person is present in the predetermined detection area 11 to an external device (external circuit).
　赤外線検出装置１００の各構成要素については、以下に、より詳細に説明する。 Each component of the infrared detection device 100 will be described in more detail below.
　赤外線検出装置１００は、上述のように、第１赤外線センサ３ａと、複数の第２赤外線センサ３ｂと、第１マルチレンズ５ａと、複数の第２マルチレンズ５ｂと、回路基板７と、ベース８と、信号処理部９と、を備える。以下では、説明の便宜上、第１赤外線受光素子３０ａの光軸３９ａと第２赤外線受光素子３０ｂの光軸３９ｂとを区別しないで説明する場合には、単に赤外線受光素子３０の光軸３９と称する。 As described above, the infrared detection device 100 includes the first infrared sensor 3 a, the plurality of second infrared sensors 3 b, the first multi lens 5 a, the plurality of second multi lenses 5 b, the circuit board 7, and the base 8. And the signal processing unit 9. In the following, for convenience of explanation, when the optical axis 39a of the first infrared light receiving element 30a and the optical axis 39b of the second infrared light receiving element 30b are described without distinction, they are simply referred to as the optical axis 39 of the infrared light receiving element 30. .
　赤外線センサ３は、赤外線受光素子３０を有する。赤外線受光素子３０は、熱型赤外線検出素子である。より詳細には、赤外線受光素子３０は、クワッドタイプの焦電素子であり、１枚の焦電体基板において４個の検出部が２×２のアレイ状（マトリクス状）に配列されている。４個の検出部の各々は、焦電体基板の第１面上に配置された第１電極と、第１面とは反対側の第２面上に配置された第２電極と、焦電体基板のうち第１電極と第２電極との間の部分と、を含むコンデンサである。第１電極は、赤外線を吸収する導電膜（例えば、ＮｉＣｒ膜）により構成されている。赤外線受光素子３０の光軸３９は、赤外線受光素子３０を厚さ方向の一方向から見て４個の検出部それぞれの受光面を包含する多角形（例えば、正方形）の中心に立てた法線である。 The infrared sensor 3 has an infrared light receiving element 30. The infrared light receiving element 30 is a thermal infrared detection element. More specifically, the infrared light receiving element 30 is a quad type pyroelectric element, and four detection units are arranged in a 2 × 2 array (matrix) in one pyroelectric substrate. Each of the four detection units includes a first electrode disposed on the first surface of the pyroelectric substrate, a second electrode disposed on the second surface opposite to the first surface, and pyroelectric It is a capacitor including the part between the 1st electrode and the 2nd electrode among body substrates. The first electrode is composed of a conductive film (for example, a NiCr film) that absorbs infrared light. The optical axis 39 of the infrared light receiving element 30 is a normal line erected at the center of a polygon (for example, a square) including the light receiving surface of each of the four detection portions when the infrared light receiving element 30 is viewed from one direction in the thickness direction. It is.
　赤外線受光素子３０は、赤外線を受光し、受光した赤外線量の変化に応じて電流信号を出力する。ここで、赤外線センサ３は、赤外線受光素子３０から出力される電流信号を電圧信号に変換する変換回路を含むＩＣ（Integrated Circuit）素子を備える。変換回路は、例えば、電流電圧変換回路と、電圧増幅回路と、を有する。電流電圧変換回路は、赤外線受光素子３０から出力される出力信号である電流信号を電圧信号に変換して出力する回路である。電圧増幅回路は、電流電圧変換回路により変換された電圧信号のうち所定の周波数帯域（例えば、０．１Ｈｚ～１０Ｈｚ）の電圧信号を増幅して出力する回路である。電圧増幅回路は、バンドパスフィルタとしての機能を有する。バンドパスフィルタとしての機能は、電流電圧変換回路から出力された電圧信号のうち上記所定の周波数帯域の成分を通過させ、かつ雑音となる不要な周波数成分を除去する機能である。 The infrared light receiving element 30 receives infrared light, and outputs a current signal according to the change in the amount of the received infrared light. Here, the infrared sensor 3 includes an IC (Integrated Circuit) element including a conversion circuit that converts a current signal output from the infrared light receiving element 30 into a voltage signal. The conversion circuit includes, for example, a current-voltage conversion circuit and a voltage amplification circuit. The current-voltage conversion circuit is a circuit that converts a current signal, which is an output signal output from the infrared light receiving element 30, into a voltage signal and outputs the voltage signal. The voltage amplification circuit is a circuit that amplifies and outputs a voltage signal of a predetermined frequency band (for example, 0.1 Hz to 10 Hz) among voltage signals converted by the current-voltage conversion circuit. The voltage amplification circuit has a function as a band pass filter. The function as a band pass filter is a function of passing the component of the predetermined frequency band out of the voltage signal output from the current-voltage conversion circuit and removing an unnecessary frequency component which becomes noise.
　赤外線センサ３は、赤外線受光素子３０とＩＣ素子とが実装される実装基板を備えている。実装基板は、例えば、成形基板である。 The infrared sensor 3 includes a mounting substrate on which the infrared light receiving element 30 and the IC element are mounted. The mounting substrate is, for example, a molded substrate.
　また、赤外線センサ３は、赤外線受光素子３０とＩＣ素子と実装基板とを含む回路モジュールを収納するパッケージ３３（図５参照）を備えている。パッケージ３３は、所謂キャンパッケージ（Can Package）である。キャンパッケージは、メタルパッケージ（Metal Package）とも呼ばれている。パッケージ３３は、図５に示すように、台座３３１と、キャップ３３２と、窓材３３３と、３つのリード端子３３４と、を備える。 The infrared sensor 3 also includes a package 33 (see FIG. 5) that accommodates a circuit module including the infrared light receiving element 30, the IC element, and the mounting substrate. The package 33 is a so-called can package (Can Package). The can package is also called a metal package (Metal Package). The package 33, as shown in FIG. 5, includes a pedestal 331, a cap 332, a window member 333 and three lead terminals 334.
　台座３３１は、導電性を有する。ここにおいて、台座３３１は、金属製である。台座３３１は、円盤状であり、厚さ方向の一面側において実装基板を支持する。 The pedestal 331 has conductivity. Here, the pedestal 331 is made of metal. The pedestal 331 has a disk shape, and supports the mounting substrate on one side in the thickness direction.
　キャップ３３２は、導電性を有する。ここにおいて、キャップ３３２は、金属製である。キャップ３３２は、有底円筒状であり、回路モジュールを覆うように台座３３１に固着される。 The cap 332 is conductive. Here, the cap 332 is made of metal. The cap 332 is cylindrical with a bottom, and is fixed to the pedestal 331 so as to cover the circuit module.
　窓材３３３は、赤外線を透過する赤外線透過部材である。窓材３３３は、導電性を有するのが好ましい。ここにおいて、窓材３３３は、例えば、シリコン基板を含む。窓材３３３は、シリコン基板に加えて、このシリコン基板に積層された赤外線光学フィルタを備えるのが好ましい。赤外線光学フィルタは、赤外線検出装置１００の検出対象の波長領域の赤外線を透過させる光学多層膜である。 The window member 333 is an infrared transmitting member that transmits infrared light. The window member 333 preferably has conductivity. Here, the window material 333 includes, for example, a silicon substrate. The window member 333 preferably includes an infrared optical filter stacked on the silicon substrate in addition to the silicon substrate. The infrared optical filter is an optical multilayer film that transmits infrared light in the wavelength region of the detection target of the infrared detection device 100.
　窓材３３３は、キャップ３３２の前壁３３２１に形成された窓孔３３２２を塞ぐように配置される。窓材３３３は、キャップ３３２に対して導電性材料により接合されており、キャップ３３２と電気的に接続されている。窓材３３３は、赤外線受光素子３０の受光面の前方に配置される。赤外線センサ３では、赤外線受光素子３０の光軸３９が窓材３３３の中心を通るように赤外線受光素子３０が配置されているのが好ましい。 The window member 333 is arranged to close the window hole 3322 formed in the front wall 3321 of the cap 332. The window member 333 is bonded to the cap 332 by a conductive material, and is electrically connected to the cap 332. The window member 333 is disposed in front of the light receiving surface of the infrared light receiving element 30. In the infrared sensor 3, it is preferable that the infrared light receiving element 30 be disposed so that the optical axis 39 of the infrared light receiving element 30 passes through the center of the window member 333.
　３つのリード端子３３４は、台座３３１に保持されている。３つのリード端子３３４の各々は、ピン状である。３つのリード端子３３４の各々は、台座３３１の厚さ方向において台座３３１を貫通している。３つのリード端子３３４は、給電用リード端子、信号出力用リード端子及びグラウンド用リード端子である。 The three lead terminals 334 are held by the pedestal 331. Each of the three lead terminals 334 is pin-shaped. Each of the three lead terminals 334 penetrates the pedestal 331 in the thickness direction of the pedestal 331. The three lead terminals 334 are a power supply lead terminal, a signal output lead terminal, and a ground lead terminal.
　赤外線検出装置１００では、５個の赤外線センサ３は、矩形板状の回路基板７に実装されている。回路基板７は、例えば、プリント基板である。回路基板７は、厚さ方向に交差する第１面７１と、第１面７１とは反対側の第２面７２と、を有する。赤外線検出装置１００では、４個の第２赤外線受光素子３０ｂが、回路基板７の第１面７１側において、１つの仮想円上に略等間隔で並ぶように配置され、第１赤外線受光素子３０ａが、上記仮想円の中心に配置されている。見方を変えれば、赤外線検出装置１００では、４個の第２赤外線受光素子３０ｂが、回路基板７の第１面７１側において、仮想正方形の４つの角に１つずつ配置され、第１赤外線受光素子３０ａが、上記仮想正方形の中心に配置されている。 In the infrared detection device 100, the five infrared sensors 3 are mounted on a rectangular plate-shaped circuit board 7. The circuit board 7 is, for example, a printed circuit board. The circuit board 7 has a first surface 71 intersecting in the thickness direction, and a second surface 72 opposite to the first surface 71. In the infrared detection device 100, the four second infrared light receiving elements 30b are arranged on the first surface 71 side of the circuit board 7 so as to be arranged at substantially equal intervals on one virtual circle, and the first infrared light receiving element 30a Are arranged at the center of the above-mentioned imaginary circle. In other words, in the infrared detection device 100, the four second infrared light receiving elements 30b are disposed at four corners of the virtual square on the first surface 71 side of the circuit board 7, and the first infrared light reception is performed. The element 30a is disposed at the center of the virtual square.
　第１赤外線受光素子３０ａの光軸３９ａ（図４参照）は、回路基板７の第１面７１に直交する。複数の第２赤外線受光素子３０ｂの各々における光軸３９ｂ（図４参照）は、回路基板７の第１面７１に斜交する。複数の第２赤外線センサ３ｂの各々は、上記仮想円の中心に立てた法線と第２赤外線受光素子３０ｂの光軸３９ｂとのなす角度が互いに同じである。また、複数の第２赤外線センサ３ｂは、上記仮想円の中心に立てた法線に対して第２赤外線受光素子３０ｂそれぞれの光軸３９ｂが傾く方向が異なるように、回路基板７に実装されている。 The optical axis 39 a (see FIG. 4) of the first infrared light receiving element 30 a is orthogonal to the first surface 71 of the circuit board 7. The optical axis 39 b (see FIG. 4) in each of the plurality of second infrared light receiving elements 30 b intersects with the first surface 71 of the circuit board 7. In each of the plurality of second infrared sensors 3b, the angle between the normal line erected at the center of the virtual circle and the optical axis 39b of the second infrared light receiving element 30b is the same. Further, the plurality of second infrared sensors 3b are mounted on the circuit board 7 so that the optical axes 39b of the second infrared light receiving elements 30b are inclined in different directions with respect to the normal line erected at the center of the virtual circle. There is.
　回路基板７には、複数（５個）の赤外線センサ３の各々における３つのリード端子３３４を１つずつ通す３つのピン挿通孔７４（図１及び４参照）が複数組（５組）設けられている。 The circuit board 7 is provided with a plurality of sets (five sets) of three pin insertion holes 74 (see FIGS. 1 and 4) for passing the three lead terminals 334 in each of the plurality (five) infrared sensors 3 one by one. ing.
　回路基板７は、円盤状のベース８において上方に膨らんだ中央部８０１の上面に配置され、ベース８に保持される。ここにおいて、回路基板７に実装される複数の赤外線センサ３は、ベース８の中央部８０１の下面側に配置される。ベース８は、電気絶縁性を有する。ベース８の材質は、例えば、合成樹脂である。 The circuit board 7 is disposed on the upper surface of the central portion 801 expanded upward in the disk-like base 8, and is held by the base 8. Here, the plurality of infrared sensors 3 mounted on the circuit board 7 are disposed on the lower surface side of the central portion 801 of the base 8. The base 8 has electrical insulation. The material of the base 8 is, for example, a synthetic resin.
　ベース８は、第１赤外線センサ３ａと回路基板７との間に介在する第１スペーサ部８１ａと、複数の第２赤外線センサ３ｂの各々の台座３３１と回路基板７との間に介在する複数の第２スペーサ部８１ｂと、を備えている。第１スペーサ部８１ａには、第１赤外線センサ３ａの３つのリード端子３３４の各々を一つずつ通す複数の孔８２ａが形成されている。また、複数の第２スペーサ部８１ｂそれぞれには、第２赤外線センサ３ｂの３つのリード端子３３４の各々を一つずつ通す複数の孔８２ｂが形成されている。第１スペーサ部８１ａでは、赤外線センサ３の台座３３１に対向する表面８１１ａが、第１赤外線受光素子３０ａの光軸３９ａに直交し、かつ、回路基板７の第１面７１に平行になっている。複数の第２スペーサ部８１ｂの各々では、赤外線センサ３の台座３３１に対向する表面８１１ｂが、第２赤外線受光素子３０ｂの光軸３９ｂに直交し、かつ、回路基板７の第１面７１に対して傾いている。 The base 8 includes a first spacer portion 81a interposed between the first infrared sensor 3a and the circuit board 7, and a plurality of pedestals interposed between the pedestals 331 of the plurality of second infrared sensors 3b and the circuit board 7. And a second spacer portion 81b. The first spacer portion 81a is formed with a plurality of holes 82a through which each of the three lead terminals 334 of the first infrared sensor 3a passes one by one. Further, in each of the plurality of second spacer portions 81b, there are formed a plurality of holes 82b through which each of the three lead terminals 334 of the second infrared sensor 3b passes one by one. In the first spacer portion 81 a, the surface 811 a facing the pedestal 331 of the infrared sensor 3 is orthogonal to the optical axis 39 a of the first infrared light receiving element 30 a and parallel to the first surface 71 of the circuit board 7 . In each of the plurality of second spacer portions 81 b, the surface 811 b facing the pedestal 331 of the infrared sensor 3 is orthogonal to the optical axis 39 b of the second infrared light receiving element 30 b and with respect to the first surface 71 of the circuit board 7 Are inclined.
　また、赤外線検出装置１００は、複数（４個）の遮光壁８３（図４参照）を更に備えるのが好ましい。複数の遮光壁８３の各々は、半円筒状である。複数の遮光壁８３の各々は、複数の第２赤外線センサ３ｂのうち一対一に対応する第２赤外線センサ３ｂの台座３３１及びキャップ３３２の略半周を囲むように第２赤外線センサ３ｂと第１赤外線センサ３ａとの間に配置されている。複数の遮光壁８３は、ベース８と一体に形成されていてもよいし、別体に形成されてベース８に固定されていてもよい。 The infrared detection device 100 preferably further includes a plurality of (four) light blocking walls 83 (see FIG. 4). Each of the plurality of light blocking walls 83 is semi-cylindrical. Each of the plurality of light shielding walls 83 surrounds the pedestal 331 of the second infrared sensor 3b corresponding to one to one of the plurality of second infrared sensors 3b and the substantially half circumference of the cap 332, and the second infrared sensor 3b and the first infrared It is arranged between the sensor 3a. The plurality of light shielding walls 83 may be integrally formed with the base 8 or may be separately formed and fixed to the base 8.
　ベース８は、その中央部８０１の下面側に、第１光学部材６ａが配置される４つの第１壁８４を備える。４つの第１壁８４の各々は、ベース８の下面側から見て、円弧状であり、第１光学部材６ａの周方向において略等間隔で配置されている。赤外線検出装置１００では、第１光学部材６ａは、２つの第１螺子（図示せず）によってベース８の４つの第１壁８４のうちの２つの第１壁８４に固定されている。 The base 8 includes four first walls 84 on the lower surface side of the central portion 801, in which the first optical member 6a is disposed. When viewed from the lower surface side of the base 8, each of the four first walls 84 has an arc shape, and is disposed at substantially equal intervals in the circumferential direction of the first optical member 6a. In the infrared detection device 100, the first optical member 6a is fixed to two first walls 84 of the four first walls 84 of the base 8 by two first screws (not shown).
　また、ベース８は、その周部８０２の下面側に、複数の第２光学部材６ｂの各々が配置される４つの第２壁８５を備える。４つの第２壁８５の各々は、ベース８の下面側から見て、第１光学部材６ａ側が開放されたＣ字状である。赤外線検出装置１００では、複数の第２光学部材６ｂの各々が、２つの第２螺子（図示せず）によってベース８の第２壁８５に固定されている。 Further, the base 8 is provided with four second walls 85 on the lower surface side of the peripheral portion 802, in which each of the plurality of second optical members 6b is disposed. Each of the four second walls 85 has a C shape in which the first optical member 6 a side is opened as viewed from the lower surface side of the base 8. In the infrared detection device 100, each of the plurality of second optical members 6b is fixed to the second wall 85 of the base 8 by two second screws (not shown).
　第１光学部材６ａは、図１に示すように、有底円筒状の第１光学部材本体６０ａと、第１光学部材本体６０ａの上端から全周に亘って外方へ突出した第１フランジ６２ａと、を備える。第１光学部材６ａでは、第１光学部材本体６０ａの下端の底壁６１ａに第１マルチレンズ５ａが形成されている。第１光学部材６ａは、第１フランジ６２ａがベース８の４つの第１壁８４の下端面に重なるように配置されている。 As shown in FIG. 1, the first optical member 6a has a bottomed cylindrical first optical member main body 60a and a first flange 62a projecting outward from the upper end of the first optical member main body 60a all around. And. In the first optical member 6a, the first multi lens 5a is formed on the bottom wall 61a of the lower end of the first optical member main body 60a. The first optical member 6 a is disposed such that the first flange 62 a overlaps the lower end surfaces of the four first walls 84 of the base 8.
　第２光学部材６ｂの各々は、図１に示すように、有底箱状の第２光学部材本体６０ｂと、第２光学部材本体６０ｂの上端から外方へ突出した第２フランジ６２ｂと、を備える。第２光学部材本体６０ｂの周壁は、ベース８側から見て、第１光学部材６ａ側が開放されたＣ字状である。第２光学部材６ｂでは、第２光学部材本体６０ｂの下端の底壁６１ｂに第２マルチレンズ５ｂが形成されている。第２光学部材６ｂは、第２フランジ６２ｂがベース８の第２壁８５の下端面に重なるように配置されている。 As shown in FIG. 1, each of the second optical members 6b has a box-shaped second optical member body 60b with a bottom and a second flange 62b protruding outward from the upper end of the second optical member body 60b. Prepare. The peripheral wall of the second optical member main body 60b has a C shape in which the first optical member 6a side is opened as viewed from the base 8 side. In the second optical member 6b, the second multi lens 5b is formed on the bottom wall 61b of the lower end of the second optical member main body 60b. The second optical member 6 b is disposed such that the second flange 62 b overlaps the lower end surface of the second wall 85 of the base 8.
　第１マルチレンズ５ａにおいて外部（所定検知エリア１１）からの赤外線が入射する第１面５０１ａ（図４参照）は、複数の第１レンズ５０ａそれぞれの入射面の一群により構成されている。第１マルチレンズ５ａにおいて赤外線が出射する第２面５０２ａ（図４参照）は、複数の第１レンズ５０ａそれぞれの出射面の一群により構成されている。 In the first multi-lens 5a, a first surface 501a (see FIG. 4) to which infrared light from the outside (predetermined detection area 11) is incident is constituted by a group of incident surfaces of each of the plurality of first lenses 50a. The second surface 502a (see FIG. 4) from which infrared light is emitted in the first multi-lens 5a is formed of a group of emission surfaces of the plurality of first lenses 50a.
　第１マルチレンズ５ａにおける複数の第１レンズ５０ａの各々は、集光レンズであり、凸レンズにより構成されている。ここで、複数の第１レンズ５０ａの各々を構成する凸レンズは、収差をより小さくする観点から、非球面レンズであるのが好ましい。 Each of the plurality of first lenses 50a in the first multi lens 5a is a condensing lens, and is configured by a convex lens. Here, it is preferable that the convex lens which comprises each of the some 1st lens 50a is an aspherical lens from a viewpoint of making an aberration smaller.
　第１マルチレンズ５ａでは、複数（３０個）の第１レンズ５０ａが、第１赤外線受光素子３０ａの光軸３９ａからの距離が互いに異なる複数（３つ）の列に分けて配置されている。ここにおいて、第１マルチレンズ５ａでは、図９に示すように、複数（３０個）の第１レンズ５０ａが互いに半径の異なる第１仮想円Ｃ１、第２仮想円Ｃ２及び第３仮想円Ｃ３上に分けて配置されている。第１仮想円Ｃ１、第２仮想円Ｃ２及び第３仮想円Ｃ３は、この順に半径が大きくなる。第１マルチレンズ５ａでは、第１仮想円Ｃ１上に４個の第１レンズ５０ａが配列され、第２仮想円Ｃ２上に１０個の第１レンズ５０ａが配列され、第３仮想円Ｃ３上に１６個の第１レンズ５０ａが配列されている。 In the first multi-lens 5a, the plurality of (30) first lenses 50a are divided into a plurality of (3) rows having different distances from the optical axis 39a of the first infrared light receiving element 30a. Here, in the first multi-lens 5a, as shown in FIG. 9, the plurality of (30) first lenses 50a are on the first virtual circle C1, the second virtual circle C2 and the third virtual circle C3 having different radii. It is divided and arranged. The radiuses of the first virtual circle C1, the second virtual circle C2 and the third virtual circle C3 increase in this order. In the first multi-lens 5a, the four first lenses 50a are arranged on the first virtual circle C1, the ten first lenses 50a are arranged on the second virtual circle C2, and the third lenses are arranged on the third virtual circle C3. Sixteen first lenses 50a are arranged.
　第１マルチレンズ５ａは、複数の第１レンズ５０ａそれぞれの第１赤外線受光素子３０ａ側での焦点が同じ位置となるように設計されているのが好ましい。第１マルチレンズ５ａは、複数の第１レンズ５０ａの各々を透過した赤外線が第１赤外線センサ３ａの窓材３３３に直接入射するように構成されているのが好ましい。 The first multi lens 5a is preferably designed such that the focal points of the plurality of first lenses 50a on the side of the first infrared light receiving element 30a are at the same position. The first multi-lens 5a is preferably configured such that the infrared rays transmitted through each of the plurality of first lenses 50a directly enter the window member 333 of the first infrared sensor 3a.
　第１マルチレンズ５ａにおける複数の第１レンズ５０ａの各々で制御する制御対象の赤外線は、例えば、５μｍ～２５μｍの波長域の赤外線である。 The infrared rays to be controlled by each of the plurality of first lenses 50a in the first multi-lens 5a are, for example, infrared rays in a wavelength range of 5 μm to 25 μm.
　第２マルチレンズ５ｂにおいて外部（所定検知エリア１１）からの赤外線が入射する第１面５０１ｂ（図４参照）は、複数の第２レンズ５０ｂそれぞれの入射面の一群により構成されている。第２マルチレンズ５ｂにおいて赤外線が出射する第２面５０２ｂ（図４参照）は、複数の第２レンズ５０ｂそれぞれの出射面の一群により構成されている。 In the second multi-lens 5b, a first surface 501b (see FIG. 4) to which infrared light from the outside (predetermined detection area 11) is incident is constituted by a group of incident surfaces of each of the plurality of second lenses 50b. The second surface 502b (see FIG. 4) from which infrared light is emitted in the second multi lens 5b is configured by a group of emission surfaces of the plurality of second lenses 50b.
　第２マルチレンズ５ｂにおける複数の第２レンズ５０ｂの各々は、集光レンズであり、凸レンズにより構成されている。ここで、複数の第２レンズ５０ｂの各々を構成する凸レンズは、非球面レンズである。複数の第２レンズ５０ｂの各々は、肉厚を薄くする観点から、フレネルレンズであるのが好ましい。 Each of the plurality of second lenses 50b in the second multi lens 5b is a condensing lens, and is configured by a convex lens. Here, the convex lenses that constitute each of the plurality of second lenses 50b are aspheric lenses. Each of the plurality of second lenses 50b is preferably a Fresnel lens from the viewpoint of reducing the thickness.
　第２マルチレンズ５ｂでは、複数（１５個）の第２レンズ５０ｂが、第１赤外線受光素子３０ａの光軸３９ａからの距離が互いに異なる複数（３つ）の列に分けて配置されている。ここにおいて、第２マルチレンズ５ｂでは、図９に示すように、複数（１５個）の第２レンズ５０ｂが互いに半径の異なる第４仮想円Ｃ４、第５仮想円Ｃ５及び第６仮想円Ｃ６上に分けて配置されている。第４仮想円Ｃ４、第５仮想円Ｃ５及び第６仮想円Ｃ６は、この順に半径が大きくなる。第４仮想円Ｃ４の半径は、第３仮想円Ｃ３の半径よりも大きい。第１仮想円Ｃ１～第６仮想円Ｃ６の中心は同じである。第２マルチレンズ５ｂでは、第４仮想円Ｃ４上に５個の第２レンズ５０ｂが配列され、第５仮想円Ｃ５上に７個の第２レンズ５０ｂが配列され、第６仮想円Ｃ６上に３個の第２レンズ５０ｂが配列されている。第２マルチレンズ５ｂでは、第１仮想円Ｃ１～第６仮想円Ｃ６に共通する一径方向において並んでいる２乃至３個の第２レンズ５０ｂについて見れば、第１仮想円Ｃ１～第６仮想円Ｃ６に共通の中心から離れた第２レンズ５０ｂほどレンズ面積が大きい。 In the second multi lens 5b, a plurality of (15) second lenses 50b are arranged in a plurality of (3) different rows from the optical axis 39a of the first infrared light receiving element 30a. Here, in the second multi lens 5b, as shown in FIG. 9, a plurality of (15) second lenses 50b are on the fourth virtual circle C4, the fifth virtual circle C5, and the sixth virtual circle C6 having mutually different radii. It is divided and arranged. The radiuses of the fourth virtual circle C4, the fifth virtual circle C5, and the sixth virtual circle C6 increase in this order. The radius of the fourth virtual circle C4 is larger than the radius of the third virtual circle C3. The centers of the first virtual circle C1 to the sixth virtual circle C6 are the same. In the second multi-lens 5b, five second lenses 50b are arranged on the fourth virtual circle C4, and seven second lenses 50b are arranged on the fifth virtual circle C5, and on the sixth virtual circle C6. Three second lenses 50b are arranged. In the second multi lens 5b, the first virtual circle C1 to the sixth virtual circle C1 to the sixth virtual circle 50 can be seen from the second to third second lenses 50b arranged in the one radial direction common to the first virtual circle C1 to the sixth virtual circle C6. The lens area is larger as the second lens 50b is farther from the center common to the circle C6.
　第２マルチレンズ５ｂは、複数の第２レンズ５０ｂそれぞれの第２赤外線受光素子３０ｂ側での焦点が同じ位置となるように設計されているのが好ましい。第２マルチレンズ５ｂは、複数の第２レンズ５０ｂの各々を透過した赤外線が第２赤外線センサ３ｂの窓材３３３に直接入射するように構成されているのが好ましい。 The second multi lens 5 b is preferably designed such that the focal points of the plurality of second lenses 50 b on the side of the second infrared light receiving element 30 b are at the same position. The second multi lens 5b is preferably configured such that the infrared rays transmitted through each of the plurality of second lenses 50b directly enter the window member 333 of the second infrared sensor 3b.
　第２マルチレンズ５ｂにおける複数の第２レンズ５０ｂの各々で制御する制御対象の赤外線は、例えば、５μｍ～２５μｍの波長域の赤外線である。 The infrared rays to be controlled by each of the plurality of second lenses 50b in the second multi-lens 5b are, for example, infrared rays in a wavelength range of 5 μm to 25 μm.
　第１マルチレンズ５ａ及び第２マルチレンズ５ｂの材料は、例えば、ポリエチレンである。より詳細には、第１マルチレンズ５ａの材料は、白色顔料又は黒色顔料が添加されたポリエチレンである。白色顔料としては、例えば、酸化チタン等の無機顔料を採用するのが好ましい。黒色顔料としては、例えば、カーボンブラック等の微粒子を採用するのが好ましい。第１マルチレンズ５ａ及び第２マルチレンズ５ｂは、例えば、成形法により形成することができる。成形法としては、例えば、射出成形法、圧縮成形法等を採用することができる。 The material of the first multi-lens 5a and the second multi-lens 5b is, for example, polyethylene. More specifically, the material of the first multi-lens 5a is polyethylene to which a white pigment or a black pigment is added. As the white pigment, for example, it is preferable to use an inorganic pigment such as titanium oxide. As the black pigment, for example, fine particles of carbon black or the like are preferably employed. The first multi lens 5a and the second multi lens 5 b can be formed, for example, by a molding method. As a molding method, an injection molding method, a compression molding method, etc. are employable, for example.
　赤外線検出装置１００は、例えば、所定検知エリア１１の中心線１１０（図４参照）が鉛直下方に向くように天井等に配置して使用されることを想定している。言い換えれば、赤外線検出装置１００は、一使用形態において、第１赤外線受光素子３０ａの受光面が鉛直下方に向くように配置されることを想定している。所定検知エリア１１は、四角錐状の３次元エリアである。所定検知エリア１１は、中心線１１０に直交する水平面内では正方形状である。 For example, it is assumed that the infrared detection device 100 is disposed on a ceiling or the like so that the center line 110 (see FIG. 4) of the predetermined detection area 11 is directed vertically downward. In other words, it is assumed that the infrared detection device 100 is arranged such that the light receiving surface of the first infrared light receiving element 30a is directed vertically downward in one usage pattern. The predetermined detection area 11 is a square pyramidal three-dimensional area. The predetermined detection area 11 is square in a horizontal plane orthogonal to the center line 110.
　赤外線検出装置１００の所定検知エリア１１の立体角は、第１受光ユニット２ａと複数の第２受光ユニット２ｂとにより規定される。赤外線検出装置１００では、所定検知エリア１１を区分した複数（９０個）の小検知エリア１３（図６Ｂ、７Ｂ及び８参照）の各々が第１受光ユニット２ａと複数（４個）の第２受光ユニット２ｂとのいずれかに対応付けられている。図６Ｂは、赤外線検出装置１００の所定検知エリア１１を、所定検知エリア１１の中心線１１０に直交する仮想平面１２０（例えば、床面）において模式的に表した図である。また、図８は、赤外線検出装置１００の複数の小検知エリア１３のうちの１つの小検知エリア１３を仮想平面１２０（例えば、床面）において模式的に表した図である。所定検知エリア１１は、９０個の小検知エリア１３を含んでいる。複数（９０個）の小検知エリア１３の各々は、赤外線受光素子３０の複数（４つ）の検出部に一対一に対応する複数（４つ）の微小検知エリア１４（図８参照）を含んでいる。複数の微小検知エリア１４は、赤外線受光素子３０から見てそれぞれ異なる方向にある。複数の微小検知エリア１４の各々は、斜四角錐状である。複数の微小検知エリア１４の各々の立体角は、小検知エリア１３の立体角よりも小さい。言い換えれば、微小検知エリア１４は、小検知エリア１３よりも狭い。微小検知エリア１４は、第１レンズ５０ａを通して第１赤外線受光素子３０ａの検出部に入射する赤外線束を赤外線の進む方向と反対の方向に延長したときに形成される３次元領域、又は第２レンズ５０ｂを通して第２赤外線受光素子３０ｂの検出部に入射する赤外線束を赤外線の進む方向と反対の方向に延長したときに形成される３次元領域である。言い換えれば、微小検知エリア１４は、赤外線受光素子３０の検出部の受光面上に像をつくるために使われる赤外線束が通ることができる３次元領域である。微小検知エリア１４は、例えば、光線追跡解析ソフトを用いたシミュレーションの結果により推定することが可能である。複数の微小検知エリア１４のそれぞれには、検出部の第１電極に一対一で対応した極性があるとみなすことができる。所定検知エリア１１、各小検知エリア１３及び各微小検知エリア１４は、光学的に規定される３次元領域であり、実際に目に見える３次元領域ではない。小検知エリア１３は、赤外線センサ３（図５参照）の窓材３３３の大きさ及び形状、窓孔３３２２の開口形状等にも依存することがある。 The solid angle of the predetermined detection area 11 of the infrared detection device 100 is defined by the first light receiving unit 2a and the plurality of second light receiving units 2b. In the infrared detection device 100, each of the plurality of (90) small detection areas 13 (see FIGS. 6B, 7B and 8) dividing the predetermined detection area 11 is the first light receiving unit 2a and the plurality of (four) second light receptions. It is associated with one of the units 2b. FIG. 6B is a view schematically representing the predetermined detection area 11 of the infrared detection device 100 in a virtual plane 120 (for example, a floor surface) orthogonal to the center line 110 of the predetermined detection area 11. FIG. 8 is a diagram schematically showing one small detection area 13 of the plurality of small detection areas 13 of the infrared detection device 100 on a virtual plane 120 (for example, a floor surface). The predetermined detection area 11 includes 90 small detection areas 13. Each of the plurality of (90) small detection areas 13 includes a plurality of (four) minute detection areas 14 (see FIG. 8) corresponding to the plurality of (four) detection portions of the infrared light receiving element 30 one by one. It is. The plurality of minute detection areas 14 are in different directions as viewed from the infrared light receiving element 30. Each of the plurality of minute detection areas 14 has an oblique square pyramid shape. The solid angle of each of the plurality of minute detection areas 14 is smaller than the solid angle of the small detection area 13. In other words, the minute detection area 14 is narrower than the small detection area 13. The minute detection area 14 is a three-dimensional area formed when the infrared ray bundle incident on the detection portion of the first infrared light receiving element 30a through the first lens 50a is extended in the direction opposite to the advancing direction of the infrared rays, or the second lens This is a three-dimensional area formed when the infrared ray bundle incident on the detection portion of the second infrared light receiving element 30b through 50b is extended in the direction opposite to the advancing direction of the infrared ray. In other words, the minute detection area 14 is a three-dimensional area through which an infrared ray bundle used to form an image on the light receiving surface of the detection unit of the infrared light receiving element 30 can pass. The minute detection area 14 can be estimated, for example, by the result of simulation using ray tracing analysis software. Each of the plurality of minute detection areas 14 can be regarded as having a polarity corresponding to the first electrode of the detection unit in a one-to-one manner. The predetermined detection area 11, each small detection area 13, and each minute detection area 14 are optically defined three-dimensional areas, not actually visible three-dimensional areas. The small detection area 13 may also depend on the size and shape of the window member 333 of the infrared sensor 3 (see FIG. 5), the opening shape of the window hole 3322 and the like.
　赤外線検出装置１００では、第１受光ユニット２ａの複数（３０個）の第１レンズ５０ａの各々について、複数（９０個）の小検知エリア１３のうちの１つの小検知エリア１３が対応づけられている。言い換えれば、第１受光ユニット２ａには、９０個の小検知エリア１３のうち３０個の小検知エリア１３が対応付けられている。また、赤外線検出装置１００では、複数（４個）の第２受光ユニット２ｂそれぞれの複数（１５個）の第２レンズ５０ｂの各々について、複数（９０個）の小検知エリア１３のうちの１つの小検知エリア１３が対応付けられている。言い換えれば、４個の第２受光ユニット２ｂの各々には、９０個の小検知エリア１３のうち１５個の小検知エリア１３が対応付けられている。つまり、赤外線検出装置１００では、第１受光ユニット２ａに対応付けられている小検知エリア１３の数（３０個）が、複数の第２受光ユニット２ｂの各々に対応付けられている小検知エリア１３の数（１５個）よりも多い。 In the infrared detection device 100, one small detection area 13 of the plurality of (90) small detection areas 13 is associated with each of the plurality of (30) first lenses 50a of the first light receiving unit 2a. There is. In other words, 30 small detection areas 13 out of 90 small detection areas 13 are associated with the first light receiving unit 2a. Further, in the infrared detection device 100, one of the plurality (90) of the small detection areas 13 is provided for each of the plurality of (15) second lenses 50b of each of the plurality of (four) second light receiving units 2b. The small detection area 13 is associated. In other words, 15 small detection areas 13 out of 90 small detection areas 13 are associated with each of the four second light receiving units 2b. That is, in the infrared detection device 100, the small detection area 13 in which the number (30) of the small detection areas 13 associated with the first light receiving unit 2a is associated with each of the plurality of second light receiving units 2b. More than the number of (15).
　赤外線検出装置１００は、上述のように、複数の赤外線受光素子３０それぞれの出力信号に基づいて所定検知エリア１１に人が存在するか否かを判定する信号処理部９を備える。信号処理部９は、例えば、複数の赤外線受光素子３０それぞれの出力信号の同期成分を抽出する同期検波を行い、同期検波の結果に基づいて、所定検知エリア１１に人が存在するか否かを判定する。信号処理部９は、例えば、同期検波を行うための乗算器、コンパレータ等を用いて構成することができる。ここにおいて、信号処理部９の構成部品は、回路基板７に実装されている。信号処理部９の構成部品は、回路基板７の第２面７２側に配置されている。信号処理部９は、上述の複数の赤外線センサ３の各々におけるＩＣ素子を含んでいてもよい。 As described above, the infrared detection device 100 includes the signal processing unit 9 that determines whether or not a person is present in the predetermined detection area 11 based on the output signal of each of the plurality of infrared light receiving elements 30. The signal processing unit 9 performs, for example, synchronous detection for extracting the synchronous component of the output signal of each of the plurality of infrared light receiving elements 30, and based on the result of synchronous detection, whether or not a person exists in the predetermined detection area 11 judge. The signal processing unit 9 can be configured using, for example, a multiplier for performing synchronous detection, a comparator, and the like. Here, the component parts of the signal processing unit 9 are mounted on the circuit board 7. The component parts of the signal processing unit 9 are disposed on the second surface 72 side of the circuit board 7. The signal processing unit 9 may include an IC element in each of the plurality of infrared sensors 3 described above.
　ところで、マルチレンズにおける複数のレンズの入射面の面積が一定の場合には、複数のレンズのうち受光素子の光軸とのなす角度の大きな光軸のレンズほど、入射した赤外線の損失が大きくなる傾向にある。そのため、特許文献１に記載された熱線式人感センサのように１つのマルチレンズのみで検知エリアを形成する赤外線検出装置では、検知エリアの最外周側での感度が低下してしまう傾向にある。 By the way, when the area of the incident surface of the plurality of lenses in the multi-lens is constant, the loss of the incident infrared radiation becomes larger as the lens of the optical axis having a larger angle with the light axis of the light receiving element among the plurality of lenses There is a tendency. Therefore, in the infrared detection device in which the detection area is formed by only one multi lens as in the heat ray type human sensor described in Patent Document 1, the sensitivity at the outermost periphery of the detection area tends to decrease. .
　これに対して、本実施形態の赤外線検出装置１００では、図４及び６Ｂに示すように、所定検知エリア１１が、中央エリア１１ａと、周辺エリア１１ｂと、に区分されている。中央エリア１１ａは、第１受光ユニット２ａに対応しており、９０個の小検知エリア１３のうち３０個の小検知エリア１３を含んでいる。周辺エリア１１ｂは、複数の第２受光ユニット２ｂに対応しており、９０個の小検知エリア１３のうち６０個の小検知エリア１３を含んでいる。中央エリア１１ａは、図６Ｂに示すように仮想平面１２０上において円形状のエリアとなる。周辺エリア１１ｂは、図６Ｂに示すように、仮想平面１２０上において中央エリア１１ａを内包する正方形のエリアから中央エリア１１ａを除いたエリア（外周が正方形で内周が円形である枠状のエリア）となる。赤外線検出装置１００では、中央エリア１１ａに含まれる各小検知エリア１３に対応する第１レンズ５０ａのレンズ面積よりも、周辺エリア１１ｂに含まれる各小検知エリア１３に対応する第２レンズ５０ｂのレンズ面積が大きい。 On the other hand, in the infrared detection device 100 of the present embodiment, as shown in FIGS. 4 and 6B, the predetermined detection area 11 is divided into a central area 11a and a peripheral area 11b. The central area 11 a corresponds to the first light receiving unit 2 a, and includes 30 small detection areas 13 out of 90 small detection areas 13. The peripheral area 11 b corresponds to the plurality of second light receiving units 2 b, and includes 60 small detection areas 13 out of 90 small detection areas 13. The central area 11a is a circular area on the virtual plane 120 as shown in FIG. 6B. The peripheral area 11b is, as shown in FIG. 6B, an area obtained by removing the central area 11a from a square area including the central area 11a on the virtual plane 120 (a frame-like area whose outer periphery is square and whose inner periphery is circular) It becomes. In the infrared detection device 100, the lens of the second lens 50b corresponding to each small detection area 13 included in the peripheral area 11b than the lens area of the first lens 50a corresponding to each small detection area 13 included in the central area 11a. The area is large.
　４つの第２受光ユニット２ｂは、所定検知エリア１１の中心線１１０を中心として４回回転対称性を有するように配置されている（図３Ａ及び３Ｂ参照）。 The four second light receiving units 2b are arranged to have four-fold rotational symmetry about the center line 110 of the predetermined detection area 11 (see FIGS. 3A and 3B).
　所定検知エリア１１は、複数（５個）の検知エリア１２（図６Ｂ及び７Ｂ参照）の合成検知エリアである。複数（５個）の検知エリア１２の各々は、複数の小検知エリア１３の合成小検知エリアである。ここにおいて、複数（５個）の検知エリア１２としては、１個の第１検知エリア１２ａと、複数（４個）の第２検知エリア１２ｂと、がある。第１検知エリア１２ａは、中央エリア１１ａと同じエリアである。複数の第２検知エリア１２ｂの各々は、中央エリア１１ａの外周方向において周辺エリア１１ｂを第２受光ユニット２ｂの数で略等分した複数のエリアの１つである。つまり、４個の第２検知エリア１２ｂの各々は、周辺エリア１１ｂを略４等分した複数のエリアの１つである。複数の第２検知エリア１２ｂの形状は、略同じである。 The predetermined detection area 11 is a combined detection area of a plurality (five) of detection areas 12 (see FIGS. 6B and 7B). Each of the plurality (five) of detection areas 12 is a combined small detection area of the plurality of small detection areas 13. Here, the plurality of (five) detection areas 12 include one first detection area 12 a and a plurality of (four) second detection areas 12 b. The first detection area 12a is the same area as the central area 11a. Each of the plurality of second detection areas 12b is one of a plurality of areas obtained by equally dividing the peripheral area 11b by the number of second light receiving units 2b in the outer peripheral direction of the central area 11a. That is, each of the four second detection areas 12b is one of a plurality of areas obtained by dividing the peripheral area 11b into four. The shapes of the plurality of second detection areas 12 b are substantially the same.
　赤外線検出装置１００では、複数の受光ユニット２それぞれの複数のレンズ５０の各々について、複数の小検知エリア１３のうちの１つの小検知エリア１３が一対一に対応している。５つの検知エリア１２のうち４つの検知エリア１２（第２検知エリア１２ｂ）には、複数の受光ユニット２のうち隣り合う２つの受光ユニット２（第２受光ユニット２ｂ）それぞれの小検知エリア１３が混在している。この点について図７Ａ及び７Ｂを用いて補足説明する。図７Ａ及び７Ｂでは、隣り合う２つ第２受光ユニット２ｂの各々における第２マルチレンズ５ｂの１５個の第２レンズ５０ｂと、隣り合う２つの第２検知エリア１２ｂの各々における１５個の小検知エリア１３と、の対応関係を説明するために、２つの第２マルチレンズ５ｂの各第２レンズ５０ｂについてのみ、一対一に対応する第２レンズ５０ｂと小検知エリア１３とに同一の記号（Ａ１１～Ａ１５、Ａ２１～Ａ２７、Ａ３１～Ａ３３、Ｂ１１～Ｂ１５、Ｂ２１～Ｂ２５、Ｂ３１～Ｂ３３）を表記してある。ただし、Ａ１１～Ａ１５、Ａ２１～Ａ２７、Ａ３１～Ａ３３、Ｂ１１～Ｂ１５、Ｂ２１～Ｂ２５、Ｂ３１～Ｂ３３の表記は、符号ではない。図７Ｂに示すように、右上の第２検知エリア１２ｂには、Ａ１１～Ａ１４、Ａ２２～Ａ２６、Ａ３１～Ａ３３と、Ｂ１５、Ｂ２７と、がある。また、図７Ｂに示すように、右下の第２検知エリア１２ｂには、Ｂ１１～Ｂ１４、Ｂ２２～Ｂ２６、Ｂ３１～Ｂ３３と、Ａ２１と、がある。赤外線検出装置１００では、所定検知エリア１１の周方向において２つの受光ユニット２それぞれの小検知エリア１３が交互に並んでいる。例えば、図７Ｂでは、所定検知エリア１１の周方向においてＡ３１，Ｂ２７、Ａ２２、Ｂ２６、Ａ２１及びＢ２５が、この順に並んでいる。 In the infrared detection device 100, one small detection area 13 of the plurality of small detection areas 13 corresponds to each other for each of the plurality of lenses 50 of each of the plurality of light receiving units 2. In the four detection areas 12 (second detection area 12b) of the five detection areas 12, small detection areas 13 of two adjacent light reception units 2 (second light reception units 2b) of the plurality of light reception units 2 are provided. It is mixed. This point will be supplementarily described with reference to FIGS. 7A and 7B. In FIGS. 7A and 7B, 15 small detections in each of the 15 second lenses 50b of the second multi-lens 5b in each of the two adjacent second light receiving units 2b and in each of the two adjacent second detection areas 12b In order to explain the correspondence relationship with the area 13, the same symbol (A11) for the second lens 50b and the small detection area 13 corresponding to each other only for each second lens 50b of the two second multi lenses 5b. To A15, A21 to A27, A31 to A33, B11 to B15, B21 to B25, B31 to B33) are shown. However, the notation of A11 to A15, A21 to A27, A31 to A33, B11 to B15, B21 to B25, and B31 to B33 is not a code. As shown in FIG. 7B, the upper right second detection area 12b includes A11 to A14, A22 to A26, A31 to A33, and B15 and B27. As shown in FIG. 7B, the lower right second detection area 12b includes B11 to B14, B22 to B26, B31 to B33, and A21. In the infrared detection device 100, the small detection areas 13 of the two light receiving units 2 are alternately arranged in the circumferential direction of the predetermined detection area 11. For example, in FIG. 7B, A31, B27, A22, B26, A21 and B25 are arranged in this order in the circumferential direction of the predetermined detection area 11.
　赤外線検出装置１００では、５つの検知エリア１２のうち４つの第２検知エリア１２ｂには、複数の受光ユニット２のうち隣り合う２つの第２受光ユニット２ｂそれぞれの小検知エリア１３が混在している。言い換えれば、赤外線検出装置１００では、４つの第２受光ユニット２ｂの各々における１５個の第２レンズ５０ｂの全部が、１つの第２検知エリア１２ｂのみに対応しているのではなく、少なくとも２つの第２検知エリア１２ｂに分けて対応している。赤外線検出装置１００の設計においては、マルチレンズ５のレンズ５０の数、形状、配置等を適宜設計することにより、検知エリア１２における小検知エリア１３の数及び配置を変えることができる。したがって、赤外線検出装置１００では、複数の第２検知エリア１２ｂの各々において１つの第２受光ユニット２ｂに対応する小検知エリア１３の数を低減できる。これにより、赤外線検出装置１００では、第２受光ユニット２ｂの第２レンズ５０ｂのレンズ面積を大きくしながらも、隣り合う小検知エリア１３間の間隔が大きくなるのを抑制することが可能となる。よって、赤外線検出装置１００では、所定検知エリア１１内の感度のばらつきを抑制することが可能となる。 In the infrared detection device 100, in the four second detection areas 12b of the five detection areas 12, the small detection areas 13 of the two adjacent second light reception units 2b of the plurality of light reception units 2 are mixed. . In other words, in the infrared detection device 100, not all of the fifteen second lenses 50b in each of the four second light receiving units 2b correspond to only one second detection area 12b, but at least two of them. It corresponds to the second detection area 12b. In the design of the infrared detection device 100, the number and the arrangement of the small detection areas 13 in the detection area 12 can be changed by appropriately designing the number, the shape, the arrangement, and the like of the lenses 50 of the multilens 5. Therefore, in the infrared detection device 100, the number of small detection areas 13 corresponding to one second light receiving unit 2b can be reduced in each of the plurality of second detection areas 12b. Thereby, in the infrared detection device 100, it is possible to suppress an increase in the distance between the adjacent small detection areas 13 while increasing the lens area of the second lens 50b of the second light receiving unit 2b. Therefore, in the infrared detection device 100, it is possible to suppress the variation in sensitivity in the predetermined detection area 11.
　赤外線検出装置１００では、４個の第２検知エリア１２ｂの各々には、単独検知エリア１２１がある。単独検知エリア１２１は、所定検知エリア１１の中心線１１０に直交する面内において検知エリア１２よりも小さい。ここにおいて、単独検知エリア１２１は、第２検知エリア１２ｂにおける１５個の小検知エリア１３のうちの１つの小検知エリア１３よりも大きく、１５個未満の小検知エリア１３を含んでいる。単独検知エリア１２１は、複数の受光ユニット２のうち隣り合う２つの受光ユニット２における一方の受光ユニット２の小検知エリア１３のみを含み他方の受光ユニット２の小検知エリア１３を含まない。赤外線検出装置１００では、所定検知エリア１１が四角錐状のエリアである。ここで、赤外線検出装置１００では、所定検知エリア１１の中心線１１０に直交する面内において所定検知エリア１１の四隅それぞれに単独検知エリア１２１がある。例えば、図７Ｂにおける右上の第２検知エリア１２ｂの単独検知エリア１２１は、Ａ１２～Ａ１４、Ａ２３～Ａ２５及びＡ３１～Ａ３３に対応する９個の小検知エリア１３を含んでいる。例えば、図７Ｂにおける右下の第２検知エリア１２ｂの単独検知エリア１２１は、Ｂ１２、Ｂ１３、Ｂ２３～Ｂ２５及びＢ３１～Ｂ３３に対応する８個の小検知エリア１３を含んでいる。 In the infrared detection device 100, there is a single detection area 121 in each of the four second detection areas 12b. The single detection area 121 is smaller than the detection area 12 in a plane orthogonal to the center line 110 of the predetermined detection area 11. Here, the single detection area 121 is larger than one small detection area 13 of the 15 small detection areas 13 in the second detection area 12 b and includes less than 15 small detection areas 13. The single detection area 121 includes only the small detection area 13 of one light receiving unit 2 in two adjacent light receiving units 2 among the plurality of light receiving units 2 and does not include the small detection area 13 of the other light receiving unit 2. In the infrared detection device 100, the predetermined detection area 11 is a square pyramidal area. Here, in the infrared detection device 100, there is an individual detection area 121 at each of four corners of the predetermined detection area 11 in a plane orthogonal to the center line 110 of the predetermined detection area 11. For example, the single detection area 121 of the upper right second detection area 12b in FIG. 7B includes nine small detection areas 13 corresponding to A12 to A14, A23 to A25, and A31 to A33. For example, the single detection area 121 in the lower right second detection area 12b in FIG. 7B includes eight small detection areas 13 corresponding to B12, B13, B23 to B25, and B31 to B33.
　隣り合う２つの受光ユニット２それぞれの小検知エリア１３が混在する検知エリア１２の数は、４つに限らず、少なくとも２つであればよい。また、隣り合う第１受光ユニット２ａと第２受光ユニット２ｂそれぞれの小検知エリア１３が、第１検知エリア１２ａ及び第２検知エリア１２ｂの各々において混在してもよい。 The number of detection areas 12 in which the small detection areas 13 of the two adjacent light receiving units 2 are mixed is not limited to four, and may be at least two. Further, the small detection areas 13 of the first light receiving unit 2a and the second light receiving unit 2b adjacent to each other may be mixed in each of the first detection area 12a and the second detection area 12b.
　また、赤外線検出装置１００では、所定検知エリア１１の中心線１１０のまわりに第１受光ユニット２ａを囲むように４つの第２受光ユニット２ｂが配置されているが、これに限らず、少なくとも３つの第２受光ユニット２ｂが第１受光ユニット２ａを囲むように配置されているのが好ましい。また、赤外線検出装置１００では、第１受光ユニット２ａを備えていることは必須ではなく、例えば、第１受光ユニット２ａを設けずに複数の第２受光ユニット２ｂの各々の第２検知エリア１２ｂを所定検知エリア１１の中心線１１０側へ広くしてもよい。 Further, in the infrared detection device 100, the four second light receiving units 2b are disposed so as to surround the first light receiving unit 2a around the center line 110 of the predetermined detection area 11. However, the present invention is not limited to this. It is preferable that the second light receiving unit 2b be disposed so as to surround the first light receiving unit 2a. Moreover, in the infrared detection apparatus 100, it is not essential to provide the 1st light reception unit 2a, for example, without providing the 1st light reception unit 2a, each 2nd detection area 12b of several 2nd light reception unit 2b is It may be wider toward the center line 110 of the predetermined detection area 11.
　以上説明した赤外線検出装置１００は、所定検知エリア１１からの赤外線を受光する受光系１を備える。受光系１は、複数の受光ユニット２を備える。複数の受光ユニット２の各々は、赤外線受光素子３０と、マルチレンズ５と、を含む。マルチレンズ５は、赤外線受光素子３０に赤外線を集光する複数のレンズ５０を有する。所定検知エリア１１は、複数の検知エリア１２の合成検知エリアである。複数の検知エリア１２の各々は、複数の小検知エリア１３の合成小検知エリアである。複数の受光ユニット２それぞれの複数のレンズ５０の各々について、複数の小検知エリア１３のうちの１つの小検知エリア１３が一対一に対応している。複数の検知エリア１２のうち少なくとも２つの検知エリア１２には、複数の受光ユニット２のうち隣り合う２つの受光ユニット２それぞれの小検知エリア１３が混在している。 The infrared detection device 100 described above includes the light receiving system 1 that receives infrared light from the predetermined detection area 11. The light receiving system 1 includes a plurality of light receiving units 2. Each of the plurality of light receiving units 2 includes an infrared light receiving element 30 and a multi-lens 5. The multi-lens 5 has a plurality of lenses 50 for condensing infrared light on the infrared light receiving element 30. The predetermined detection area 11 is a combined detection area of a plurality of detection areas 12. Each of the plurality of detection areas 12 is a combined small detection area of the plurality of small detection areas 13. For each of the plurality of lenses 50 of each of the plurality of light receiving units 2, one small detection area 13 of the plurality of small detection areas 13 corresponds one to one. In at least two detection areas 12 of the plurality of detection areas 12, the small detection areas 13 of two adjacent light reception units 2 of the plurality of light reception units 2 are mixed.
　以上の構成により、赤外線検出装置１００は、所定検知エリア１１内の感度のばらつきを抑制することが可能となる。ここにおいて、赤外線検出装置１００では、複数の検知エリア１２のうち少なくとも２つの検知エリア１２には、複数の受光ユニット２のうち隣り合う２つの受光ユニット２それぞれの小検知エリア１３が混在しているので、当該隣り合う２つの受光ユニット２それぞれの複数のレンズ５０のうち所定検知エリア１１の中心線１１０から相対的に遠いレンズ５０のレンズ面積をより大きくすることができ、所定検知エリア１１内において隣り合う小検知エリア１３間の距離をより短くすることが可能となる。これにより、赤外線検出装置１００では、所定検知エリア１１内の感度のばらつきを抑制することが可能となる。要するに、赤外線検出装置１００では、所定検知エリア１１内の感度の均一化を図ることが可能となる。 With the above configuration, the infrared detection device 100 can suppress variations in sensitivity in the predetermined detection area 11. Here, in the infrared detection device 100, in at least two detection areas 12 among the plurality of detection areas 12, the small detection areas 13 of the two adjacent light reception units 2 among the plurality of light reception units 2 are mixed. Therefore, the lens area of the lens 50 relatively far from the center line 110 of the predetermined detection area 11 among the plurality of lenses 50 of each of the two adjacent light reception units 2 can be made larger, and within the predetermined detection area 11 It is possible to further shorten the distance between adjacent small detection areas 13. Thus, in the infrared detection device 100, it is possible to suppress the variation in sensitivity in the predetermined detection area 11. In short, in the infrared detection device 100, it is possible to make the sensitivity in the predetermined detection area 11 uniform.
　また、赤外線検出装置１００は、上記の熱線式人感センサにおいて半球状のマルチレンズの直径を大きくしてレンズを配列する列数を増やすことで所定検知エリアを広げた場合と比べて、所定検知エリア１１の最外周側での感度の低下を抑制することが可能となる。言い換えれば、赤外線検出装置１００は、視野角を大きくしながらも所定検知エリア１１の最外周側での感度の低下を抑制することが可能となり、視野角を大きくしながらも所定検知エリア１１内の感度のばらつきを抑制することが可能となる。「視野角」とは、赤外線検出装置１００の所定検知エリア１１の広がり角を意味する。 Further, the infrared detection device 100 performs predetermined detection as compared with the case where the predetermined detection area is expanded by increasing the diameter of the hemispherical multi-lens and increasing the number of rows in which the lenses are arranged in the heat ray type human sensor described above. It is possible to suppress a decrease in sensitivity on the outermost peripheral side of the area 11. In other words, the infrared detection device 100 can suppress the decrease in sensitivity on the outermost side of the predetermined detection area 11 while increasing the viewing angle, and the inside of the predetermined detection area 11 while increasing the viewing angle. It is possible to suppress variations in sensitivity. The “viewing angle” means the spread angle of the predetermined detection area 11 of the infrared detection device 100.
　赤外線検出装置１００では、所定検知エリア１１の周方向において２つの受光ユニット２それぞれの小検知エリア１３が交互に並んでいるのが好ましい。これにより、赤外線検出装置１００では、所定検知エリア１１の中心線１１０から相対的に遠いレンズ５０の、所定検知エリア１１の周方向に沿った方向の幅を広げてレンズ面積を大きくすることが可能となり、赤外線検出装置１００の小型化を図ることが可能となる。ここにおいて、所定検知エリア１１の中心線１１０から相対的に遠いレンズ５０は、例えば、上述の図９を参照して説明した第５仮想円Ｃ５上に配列される複数のレンズ５０、第６仮想円Ｃ６上に配列される複数のレンズ５０等である。第５仮想円Ｃ５上に配列される複数のレンズ５０は、第５仮想円Ｃ５の周方向における幅を広くすることが可能となる。また、第６仮想円Ｃ６上に配列される複数のレンズ５０は、第６仮想円Ｃ６の周方向における幅を広くすることが可能となる。 In the infrared detection device 100, it is preferable that the small detection areas 13 of the two light receiving units 2 are alternately arranged in the circumferential direction of the predetermined detection area 11. Thereby, in the infrared detection device 100, it is possible to widen the width of the lens 50 relatively far from the center line 110 of the predetermined detection area 11 in the direction along the circumferential direction of the predetermined detection area 11, thereby enlarging the lens area Thus, the infrared detection device 100 can be miniaturized. Here, the lens 50 relatively far from the center line 110 of the predetermined detection area 11 is, for example, the plurality of lenses 50 arranged on the fifth virtual circle C5 described with reference to FIG. It is a plurality of lenses 50 grade arranged on circle C6. The plurality of lenses 50 arranged on the fifth virtual circle C5 can increase the width of the fifth virtual circle C5 in the circumferential direction. Further, the plurality of lenses 50 arranged on the sixth virtual circle C6 can increase the width of the sixth virtual circle C6 in the circumferential direction.
　赤外線検出装置１００では、複数の受光ユニット２は、所定検知エリア１１の中心線１１０のまわりに配置された少なくとも３つの受光ユニット２を含むのが好ましい。ここで、少なくとも３つの受光ユニット２が、２以上の整数ｎを用いた場合に所定検知エリア１１の中心線１１０を中心としてｎ回回転対称性を有するように配置されているのが好ましい。これにより、赤外線検出装置１００は、赤外線検出装置１００は、所定検知エリア１１をより広くすることが可能となる。 In the infrared detection device 100, the plurality of light receiving units 2 preferably include at least three light receiving units 2 disposed around the center line 110 of the predetermined detection area 11. Here, it is preferable that at least three light receiving units 2 be arranged to have n-fold rotational symmetry centering on the center line 110 of the predetermined detection area 11 when an integer n of 2 or more is used. Thus, the infrared detection device 100 can make the predetermined detection area 11 wider.
　赤外線検出装置１００では、検知エリア１２には、所定検知エリア１１の中心線１１０に直交する面内において検知エリア１２よりも小さくかつ複数の小検知エリア１３のうちの１つの小検知エリア１３よりも大きい単独検知エリア１２１があるのが好ましい。ここにおいて、単独検知エリア１２１は、複数の受光ユニット２のうち隣り合う２つの受光ユニット２における一方の受光ユニット２の小検知エリア１３のみを含み他方の受光ユニット２の小検知エリア１３を含まない。これにより、赤外線検出装置１００では、例えば、ユーザの希望で所定検知エリア１１を狭くしたい場合、所定検知エリア１１の形状を変更したい場合等に、単独検知エリア１２１に含まれる一群の小検知エリア１３に一対一に対応する一群のレンズ５０を赤外線遮光部材等によって隠すことで対応することが可能となる。赤外線遮光部材は、例えば、赤外線を遮光するシール、赤外線を遮光する樹脂成形部材等である。 In the infrared detection device 100, the detection area 12 is smaller than the detection area 12 in a plane orthogonal to the center line 110 of the predetermined detection area 11 and is smaller than one small detection area 13 of the plurality of small detection areas 13. Preferably there is a large single detection area 121. Here, the single detection area 121 includes only the small detection area 13 of one light receiving unit 2 in two adjacent light receiving units 2 among the plurality of light receiving units 2 and does not include the small detection area 13 of the other light receiving unit 2 . Thereby, in the infrared detection device 100, for example, when it is desired to narrow the predetermined detection area 11 at the user's request, the group of small detection areas 13 included in the single detection area 121 when the shape of the predetermined detection area 11 is to be changed. It becomes possible to cope by concealing the group of lenses 50 corresponding to one to one with an infrared ray shielding member or the like. The infrared ray shielding member is, for example, a seal that shields infrared rays, a resin molded member that shields infrared rays, or the like.
　赤外線検出装置１００では、所定検知エリア１１が四角錐状のエリアであり、所定検知エリア１１の中心線１１０に直交する面内において所定検知エリア１１の四隅の各々に単独検知エリア１２１があるのが好ましい。これにより、赤外線検出装置１００では、例えば、赤外線検出装置１００の所定検知エリア１１の形状を容易に変更することが可能となる。一例として、ユーザが、所定検知エリア１１の中心線１１０に直交する面内において所定検知エリア１１の四隅に１つずつ４つの単独検知エリア１２１のうち隣り合う２つの単独検知エリア１２１と、当該隣り合う２つの単独検知エリア１２１の間にある複数の小検知エリア１３の全部と、を含む帯状のエリアを非検知エリアとしたい場合について説明する。この例では、上記非検知エリアに沿った方向を長手方向とする帯状の赤外線遮光部材によって、隣り合う２つの第２受光ユニット２ｂの各々の外周側の複数の第２レンズ５０ｂを隠すことで所定検知エリア１１の形状を変更することが可能となる。図１０Ａでは、マルチレンズ５を含む光学部材６において赤外線遮光部材によって隠される領域に、ドットのハッチングを付してあり、図１０Ｂでは、この赤外線遮光部材が設けられたことにより所定検知エリア１１のうち非検知エリアとなる領域に、ドットのハッチングを付してある。これらのハッチングは、断面を表すものではなく、説明を簡単にするために付してあるにすぎない。 In the infrared detection device 100, the predetermined detection area 11 is a quadrangular pyramid area, and there is an independent detection area 121 at each of the four corners of the predetermined detection area 11 in a plane orthogonal to the center line 110 of the predetermined detection area 11. preferable. Thereby, in the infrared detection device 100, for example, the shape of the predetermined detection area 11 of the infrared detection device 100 can be easily changed. As an example, in the plane orthogonal to the center line 110 of the predetermined detection area 11, the user places two adjacent single detection areas 121 of the four individual detection areas 121, one at each of the four corners of the predetermined detection area 11, A case will be described in which a band-like area including all of the plurality of small detection areas 13 between two matching single detection areas 121 is used as a non-detection area. In this example, it is determined by hiding the plurality of second lenses 50b on the outer peripheral side of each of the two adjacent second light receiving units 2b by a band-like infrared light shielding member whose longitudinal direction is a direction along the non-detection area. It is possible to change the shape of the detection area 11. In FIG. 10A, hatching of dots is given to a region hidden by the infrared ray shielding member in the optical member 6 including the multi-lens 5, and in FIG. 10B, the infrared ray shielding member is provided to provide the predetermined detection area 11 Of these areas, areas that become non-detection areas are hatched with dots. These hatchings do not represent cross sections, and are merely provided to simplify the description.
　赤外線検出装置１００では、赤外線受光素子３０は、焦電素子であるのが好ましい。これにより、赤外線検出装置１００は、赤外線受光素子３０がサーモパイル、抵抗ボロメータ等である場合に比べて、赤外線を放射する物体（例えば、人体）の動きを検知しやすくなる。 In the infrared detection device 100, the infrared light receiving element 30 is preferably a pyroelectric element. Thus, the infrared detection device 100 can more easily detect the movement of an object (for example, a human body) that emits infrared light, as compared to the case where the infrared light receiving element 30 is a thermopile, a resistance bolometer, or the like.
　赤外線検出装置１００は、信号処理部９を更に備えるのが好ましい。信号処理部９は、複数の赤外線受光素子３０それぞれの出力信号に基づいて所定検知エリア１１に人が存在するか否かを判定する。これにより、赤外線検出装置１００は、人体検知装置として利用することが可能となる。 The infrared detection device 100 preferably further includes a signal processing unit 9. The signal processing unit 9 determines whether or not a person exists in the predetermined detection area 11 based on the output signal of each of the plurality of infrared light receiving elements 30. Thus, the infrared detection device 100 can be used as a human body detection device.
　上述の赤外線受光素子３０は、クワッドタイプの焦電素子に限らず、例えば、デュアルタイプの焦電素子、シングルタイプの焦電素子等でもよい。また、焦電素子における検出部の形状、配列等も特に限定されない。例えば、焦電素子は、１枚の焦電体基板に、４個の検出部が１×４のアレイ状に配列された構成でもよい。この場合、４つの検出部の各々の平面視形状は、長方形である。また、隣り合う検出部どうしが逆並列に接続されている。また、焦電素子は、焦電体基板を備えた構成に限らず、例えば、シリコン基板の表面上の電気絶縁膜上に、裏面電極、焦電体薄膜及び表面電極がこの順に並んで構成される検出部が形成されたチップでもよい。このようなチップは、例えば、マイクロマシニング技術及び焦電体薄膜の形成技術等を利用して形成することができる。 The infrared light receiving element 30 described above is not limited to the quad type pyroelectric element, but may be, for example, a dual type pyroelectric element, a single type pyroelectric element, or the like. Further, the shape, the arrangement, and the like of the detection unit in the pyroelectric element are not particularly limited. For example, the pyroelectric element may have a configuration in which four detection units are arranged in a 1 × 4 array on one pyroelectric substrate. In this case, the plan view shape of each of the four detection units is a rectangle. Further, adjacent detection units are connected in reverse parallel. Further, the pyroelectric element is not limited to the configuration provided with the pyroelectric substrate, and for example, the back electrode, the pyroelectric thin film, and the surface electrode are arranged in this order on the electrical insulating film on the surface of the silicon substrate. It may be a chip on which a detection unit is formed. Such a chip can be formed, for example, using micromachining technology and pyroelectric thin film forming technology.
　赤外線検出装置１００は、人体検知に限らず、例えばガス検知等の他の用途で用いられてもよい。 The infrared detection device 100 is not limited to human body detection, and may be used in other applications such as gas detection.
　赤外線検出装置１００は、例えば、配線器具、機器等に利用することができる。機器としては、例えば、照明器具、照明装置、テレビ、パーソナルコンピュータ、空気調和機、加湿器、冷蔵庫、コピー機、デジタルサイネージ、デジタルフォトフレーム、小便器、自販機、券売機、現金自動預け払い機、ガスセンサ、ガス分析装置等がある。 The infrared detection device 100 can be used for, for example, a wiring apparatus, an apparatus, and the like. The devices include, for example, lighting fixtures, lighting devices, televisions, personal computers, air conditioners, humidifiers, refrigerators, copy machines, digital signage, digital photo frames, urinals, vending machines, ticket vending machines, automatic teller machines, There are gas sensors, gas analyzers, etc.
　１００　赤外線検出装置
　１　受光系
　２　受光ユニット
　３０　赤外線受光素子
　５　マルチレンズ
　５０　レンズ
　９　信号処理部
　１１　所定検知エリア
　１１０　中心線
　１２　検知エリア
　１２１　単独検知エリア
　１３　小検知エリア 100 infrared detector 1 light receiving system 2 light receiving unit 30 infrared light receiving element 5 multi lens 50 lens 9 signal processing unit 11 predetermined detection area 110 center line 12 detection area 121 single detection area 13 small detection area

Claims (7)

  1. 　所定検知エリアからの赤外線を受光する受光系を備え、
    　前記受光系は、各々が赤外線受光素子と前記赤外線受光素子に赤外線を集光する複数のレンズを有するマルチレンズとを含む複数の受光ユニットを備え、
    　前記所定検知エリアは、複数の検知エリアの合成検知エリアであり、
    　前記複数の検知エリアの各々は、複数の小検知エリアの合成小検知エリアであり、
    　前記複数の受光ユニットそれぞれの前記複数のレンズの各々について、前記複数の小検知エリアのうちの１つの小検知エリアが一対一に対応し、
    　前記複数の検知エリアのうち少なくとも２つの検知エリアには、前記複数の受光ユニットのうち隣り合う２つの受光ユニットそれぞれの小検知エリアが混在している
    　ことを特徴とする赤外線検出装置。     A light receiving system for receiving infrared light from a predetermined detection area;
    The light receiving system includes a plurality of light receiving units each including an infrared light receiving element and a multi-lens having a plurality of lenses for condensing infrared light onto the infrared light receiving element,
    The predetermined detection area is a combined detection area of a plurality of detection areas,
    Each of the plurality of detection areas is a combined small detection area of a plurality of small detection areas,
    For each of the plurality of lenses of each of the plurality of light receiving units, one small detection area of the plurality of small detection areas corresponds one to one,
    An infrared detection device characterized in that in at least two detection areas of the plurality of detection areas, small detection areas of two adjacent light reception units of the plurality of light reception units are mixed.
  2. 　前記所定検知エリアの周方向において前記２つの受光ユニットそれぞれの小検知エリアが交互に並んでいる
    　ことを特徴とする請求項１記載の赤外線検出装置。     The infrared detection device according to claim 1, wherein small detection areas of the two light receiving units are alternately arranged in the circumferential direction of the predetermined detection area.
  3. 　前記複数の受光ユニットは、前記所定検知エリアの中心線のまわりに配置された少なくとも３つの受光ユニットを含み、
    　前記少なくとも３つの受光ユニットが、２以上の整数ｎを用いた場合に前記所定検知エリアの中心線を中心としてｎ回回転対称性を有するように配置されている
    　ことを特徴とする請求項２記載の赤外線検出装置。     The plurality of light receiving units include at least three light receiving units disposed around a center line of the predetermined detection area,
    The at least three light receiving units are arranged so as to have n-fold rotational symmetry centering on the center line of the predetermined detection area when using an integer n of 2 or more. Infrared detector.
  4. 　前記検知エリアには、前記所定検知エリアの中心線に直交する面内において前記検知エリアよりも小さくかつ前記複数の小検知エリアのうちの１つの小検知エリアよりも大きい単独検知エリアがあり、
    　前記単独検知エリアは、前記複数の受光ユニットのうち隣り合う２つの受光ユニットにおける一方の受光ユニットの小検知エリアのみを含み他方の受光ユニットの小検知エリアを含まない
    　ことを特徴とする請求項１乃至３のいずれか一項に記載の赤外線検出装置。     The detection area includes a single detection area smaller than the detection area in a plane orthogonal to the center line of the predetermined detection area and larger than one small detection area of the plurality of small detection areas,
    The single detection area includes only a small detection area of one light receiving unit in two adjacent light receiving units among the plurality of light receiving units, and does not include a small detection area of the other light receiving unit. The infrared detection device according to any one of to 3.
  5. 　前記所定検知エリアが四角錐状のエリアであり、
    　前記所定検知エリアの中心線に直交する面内において前記所定検知エリアの四隅の各々に前記単独検知エリアがある
    　ことを特徴とする請求項４記載の赤外線検出装置。     The predetermined detection area is a square pyramidal area,
    The infrared detection device according to claim 4, wherein the single detection area is present at each of four corners of the predetermined detection area in a plane orthogonal to a center line of the predetermined detection area.
  6. 　前記赤外線受光素子は、焦電素子である
    　ことを特徴とする請求項１乃至５のいずれか一項に記載の赤外線検出装置。     The infrared detection device according to any one of claims 1 to 5, wherein the infrared light receiving element is a pyroelectric element.
  7. 　信号処理部を更に備え、前記信号処理部は、前記複数の赤外線受光素子それぞれの出力信号に基づいて前記所定検知エリアに人が存在するか否かを判定する
    　ことを特徴とする請求項１乃至６のいずれか一項に記載の赤外線検出装置。     The signal processing unit is further provided, and the signal processing unit determines whether or not a person is present in the predetermined detection area based on the output signal of each of the plurality of infrared light receiving elements. The infrared detection device according to any one of 6.
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