WO2018101002A1 - Dispositif de détection infrarouge - Google Patents

Dispositif de détection infrarouge 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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WIPO (PCT)
Prior art keywords
light receiving
infrared
detection area
detection
area
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PCT/JP2017/040419
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English (en)
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/fr

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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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'un dispositif de détection infrarouge grâce auquel il est possible de supprimer une irrégularité de sensibilité dans une zone de détection. Chaque unité parmi une pluralité d'unités de réception de lumière (2) dans un système de réception de lumière (1) comprend un élément de réception de lumière infrarouge (30) et une multilentille (5). La multilentille (5) comporte une pluralité de lentilles (50). Une zone de détection prédéfinie (11) est une zone de détection synthétique d'une pluralité de zones de détection (12). Chaque zone parmi la pluralité de zones de détection (12) est une petite zone de détection synthétique d'une pluralité de petites zones de détection (13). Chaque lentille parmi la pluralité de lentilles (50) de chaque unité parmi la pluralité d'unités de réception de lumière (2) correspond biunivoquement à une seule petite zone de détection (13) parmi la pluralité de petites zones de détection (13). Dans au moins deux zones de détection (12) parmi la pluralité de zones de détection (12), les petites zones de détection (13) de chaque unité parmi deux unités de réception de lumière (2) adjacentes parmi la pluralité d'unités de réception de lumière (2) s'entremêlent.
PCT/JP2017/040419 2016-11-30 2017-11-09 Dispositif de détection infrarouge WO2018101002A1 (fr)

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JP2016233476A JP6709984B2 (ja) 2016-11-30 2016-11-30 赤外線検出装置

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