WO2014041818A1 - Dispositif et procédé d'imagerie - Google Patents

Dispositif et procédé d'imagerie Download PDF

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Publication number
WO2014041818A1
WO2014041818A1 PCT/JP2013/005451 JP2013005451W WO2014041818A1 WO 2014041818 A1 WO2014041818 A1 WO 2014041818A1 JP 2013005451 W JP2013005451 W JP 2013005451W WO 2014041818 A1 WO2014041818 A1 WO 2014041818A1
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WO
WIPO (PCT)
Prior art keywords
polarizer
light
imaging
light source
imaging apparatus
Prior art date
Application number
PCT/JP2013/005451
Other languages
English (en)
Japanese (ja)
Inventor
隆春 藤井
翔 五月女
Original Assignee
京セラオプテック株式会社
京セラ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラオプテック株式会社, 京セラ株式会社 filed Critical 京セラオプテック株式会社
Publication of WO2014041818A1 publication Critical patent/WO2014041818A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21—Polarisation-affecting properties

Definitions

  • the present invention relates to an imaging apparatus capable of imaging by irradiating a subject with linearly polarized light and switching reflected light to at least parallel Nicols and vertical Nicols.
  • an object of the present invention made in view of such circumstances is to reduce the size of an imaging apparatus that irradiates a subject with linearly polarized light and switches reflected light to at least parallel Nicols and vertical Nicols.
  • the imaging apparatus is A first polarizer and a second polarizer, at least one of which is pivotally supported and switchable to either a parallel Nicol or vertical Nicol relationship;
  • a light source unit that emits illumination light that is linearly polarized by the first polarizer and that uniformly illuminates the entire subject;
  • an imaging element that captures an optical image of the subject that is linearly polarized by the second polarizer.
  • the light shielding part preferably attenuates incident light.
  • the light source unit increases the amount of the illumination light when the first polarizer and the second polarizer are in a vertical Nicol relationship, compared to a parallel Nicol relationship. .
  • the light source unit includes a plurality of light sources, and emits light when the first polarizer and the second polarizer have a vertical Nicol relationship, and the light source unit emits a light when the parallel Nicol relationship exists. In addition to the predetermined part of the light source, it is preferable to emit light from another light source.
  • An imaging method is At least one is rotatably supported, and the first polarizer and the second polarizer can be switched to either parallel Nicols or vertical Nicols, and the first polarizer makes linearly polarized light.
  • Biological tissue using an imaging apparatus comprising: a light source that emits illumination light that uniformly illuminates the entire subject; and an imaging device that captures an optical image of the subject that is linearly polarized by the second polarizer.
  • the imaging apparatus configured as described above, it is possible to reduce the size of the imaging apparatus that irradiates the subject with linearly polarized light and switches the reflected light to at least parallel Nicols and vertical Nicols. is there.
  • FIG. 1 is an external view of an imaging apparatus according to a first embodiment of the present invention. It is a structural diagram showing the internal configuration of the imaging device. It is an arrangement figure showing arrangement of a chip LED light source in a light source part in a 2nd embodiment.
  • FIG. 1 is an external view of an imaging apparatus according to the present embodiment.
  • the imaging device 10 is configured by connecting a camera unit 11 and a gripping unit 12.
  • the camera unit 11 has a contact surface 13 that contacts the subject.
  • a hole 14 is formed at the center of the contact surface 13, and the camera unit 11 can capture an optical image incident from the hole 14.
  • the grip portion 12 is connected to the camera portion 11 on the opposite side of the contact surface 13.
  • the imaging apparatus 10 assumes that the imaging is performed with the contact surface 13 in contact with a subject such as skin, and the grip portion 12 is formed in a shape that allows the contact surface 13 to easily contact the subject.
  • the grip portion 12 has an imaging switch 15.
  • the imaging switch 15 is provided at a position where the user can easily switch on and off while holding the grip portion 12.
  • the imaging device 10 includes a light source unit 16, a first polarizer 17, a light shielding unit 18, a second polarizer 19, an optical system 20, a voice coil motor 21, and an imaging element 22.
  • the light source unit 16 includes an LED substrate 23 and a plurality of surface-emitting chip LED light sources 24.
  • the LED substrate 23 is a ring-shaped flat plate having a predetermined inner diameter, and is fixed in the camera unit 11 so that a perpendicular passing through the center of the LED substrate 23 passes through the center of the hole 14 and is parallel to the contact surface 13.
  • the LED substrate 23 supports a plurality of chip LED light sources 24 arranged uniformly on the contact surface 13 side.
  • the LED substrate 23 supports the Hall IC 25 at a specific position. Each chip LED light source 24 emits illumination light to the contact surface 13 side.
  • Each chip LED light source 24 switches light emission and extinction by switching ON / OFF of the imaging switch 15.
  • the Hall IC 25 will be described later.
  • the first polarizer 17 is formed in a ring shape having the same inner diameter as the LED substrate 23.
  • the first polarizer 17 is supported in the camera unit 11 so that a perpendicular passing through the center of the first polarizer 17 passes through the center of the hole 14 and is rotatable about the center of the first polarizer 17. Is done.
  • the first polarizer 17 can rotate between a first rotation position and a second rotation position rotated by 90 °.
  • the first polarizer 17 can be rotated manually and / or automatically using a motor or the like.
  • the first polarizer 17 is disposed closer to the contact surface 13 than the light source unit 16 and transmits the linearly polarized component of the illumination light emitted from the chip LED light source 24.
  • the chip LED light source 24 is a surface-emitting light-emitting element, and the illumination light that has been linearly polarized by the first polarizer 17 uniformly illuminates the entire subject located in the hole 14.
  • the first polarizer 17 has a magnet 26 at a position facing the Hall IC 25 on the grip portion 12 side.
  • the magnet 26 functions as a rotational position detection sensor in cooperation with the Hall IC 25.
  • the Hall IC 25 can detect the rotational position of the first polarizer 17 and output it to an image processing apparatus or the like. The detected rotation position can be used for discrimination of an observation mode in the image processing apparatus.
  • the light shielding part 18 has a cylindrical shape whose outer diameter is accommodated in the inner diameters of the LED substrate 23 and the first polarizer 17.
  • the light shielding unit 18 is inserted into the hole of the LED substrate 23 and the first polarizer 17 so as to coincide with the upper surface of the first polarizer 17 or protrude beyond the upper surface of the LED substrate 23.
  • the light shielding unit 18 blocks light incident on the imaging element 22 other than the reflected light from the subject of the illumination light emitted from the chip LED light source 24.
  • the light shielding unit 18 has an inner surface and an outer surface that are painted black, for example, and attenuates light incident on the light shielding unit 18.
  • the second polarizer 19 is larger than the inner diameter of the light shielding part 18 and is fixed so as to cover the end of the light shielding part 18 on the gripping part 12 side.
  • the second polarizer 19 has a plane of polarization parallel to the first polarizer 17 when the first polarizer 17 is in the first rotational position, and the first polarizer 17 When in the second rotational position, the first polarizer 17 is fixed in an adjusted state so as to have a vertical Nicol relationship.
  • the second polarizer 19 transmits the linearly polarized component of the reflected light of the subject incident on the light shielding unit 18.
  • the second polarizer 19 controls the component of light that passes through the inside of the light shielding portion 18 and is incident on the image sensor 22, and instead of the position described above, the incident side opening (see FIG. 2) of the light shielding portion 18. You may provide in 19 'position shown with the dashed-two dotted line.
  • the optical system 20 includes a plurality of lenses such as a variable power lens and a focus lens.
  • the optical system 20 is disposed in the camera unit 11 so that the optical axis passes through the center of the hole 14.
  • the optical system 20 forms an optical image of the subject on the light receiving surface of the image sensor 22. Zooming in and zooming out is possible by displacing the zoom lens along the optical axis. By displacing the focus lens along the optical axis, it is possible to focus the optical image of the subject on the light receiving surface of the image sensor 22.
  • the voice coil motor 21 displaces the zoom lens and / or the focus lens along the optical axis.
  • the device for displacing the zoom lens and / or the focus lens is not limited to the voice coil motor, and conventionally known driving means such as a DC motor may be applied.
  • the imaging element 22 is fixed in the camera unit 11 via the sensor substrate 27 so that a perpendicular passing through the center of the light receiving surface passes through the center of the hole 14.
  • the image sensor 22 captures an optical image formed on the light receiving surface as a still image and / or a moving image.
  • the imaging element 22 switches between execution and stop of imaging by switching ON / OFF of the imaging switch 15. For example, an image captured as a still image and / or a moving image is subjected to image processing in an image processing device connected to the imaging device 10 wirelessly or by wire, and can be observed using a display device or a tablet terminal.
  • the subject is a living tissue such as skin
  • a part of the subject is directly reflected on the surface and the rest is indirectly reflected on the inside of the surface.
  • the polarization state of illumination light is maintained in the reflected light, and in indirect reflection, the polarization state changes. Therefore, in the state where the first polarizer 17 and the second polarizer 19 are in parallel Nicols, the optical image inside the surface where indirect reflection occurs is shielded, and the optical image of the surface where direct reflection occurs is applied to the image sensor 22. Incident.
  • the optical image on the surface where direct reflection occurs is shielded, and the optical image inside the surface where indirect reflection occurs enters the image sensor 22. To do.
  • the chip LED light source 24 with a wide irradiation angle can be used to irradiate the entire subject with illumination light with little light amount unevenness.
  • Such an optical system is unnecessary. Since there is no need to provide such an optical system, the imaging device 10 can be downsized.
  • the LED substrate 23 and the first light shielding unit 18 are arranged so that the light shielding unit 18 coincides with the upper surface of the first polarizer 17 or protrudes beyond the upper surface. Are inserted into the holes of the polarizer 17. Therefore, an imaging device for illumination light that does not pass through the first polarizer 17, such as part of illumination light emitted from the chip LED light source 24 that reflects on the surface of the first polarizer 17 on the chip LED light source 24 side. 22 can be prevented from entering. By preventing the incidence of such illumination light, it is possible to capture a clear image of the surface of the subject or the surface below the surface.
  • the imaging apparatus of the first embodiment since the light incident on the surface of the light shielding unit 18 is attenuated, the illumination light that is irregularly reflected in the camera unit 11 and the light shielding unit 18 is attenuated to the imaging element 22. Can be prevented. Therefore, it is possible to capture a clear image of the surface of the subject or the subsurface.
  • the rotational position detection sensor since the rotational position detection sensor is provided, it is possible to detect whether or not the first polarizer 17 and the second polarizer 19 are parallel Nicols and vertical Nicols. It is.
  • the magnet that forms the rotational position detection sensor is provided in the first polarizer 17, a signal line for outputting the rotational position is provided in the first polarizer 17. Installation is not necessary. Therefore, since the signal line is not disposed on the rotatable first polarizer 17, the manufacturing is simple, and when the signal line is connected to the outside of the first polarizer 17, there is a problem such as disconnection. Will not occur.
  • the configuration of the light source unit and the light emission control are different from those in the first embodiment.
  • the second embodiment will be described below with a focus on differences from the first embodiment.
  • symbol is attached
  • the imaging apparatus 10 includes a light source unit 16, a first polarizer 17, a light shielding unit 18, a second polarizer 19, an optical system 20, a voice coil motor 21, and an imaging element 22.
  • the configurations and functions of the first polarizer 17, the light shielding unit 18, the second polarizer 19, the optical system 20, the voice coil motor 21, and the image sensor 22 are the same as those in the first embodiment.
  • the light source unit 16 includes an LED substrate 23 and a plurality of chip LED light sources 24i and 24o.
  • a plurality of chip LED light sources 24i and 24o are uniformly arranged at the inner position and the outer position of the LED substrate.
  • eight chip LED light sources 24i are arranged along the annular shape.
  • eight chip LED light sources 24o are arranged along an annulus closer to the outer edge than the chip LED light sources 24i arranged near the inner edge of the LED substrate 23.
  • the light source unit 16 is disposed in the vicinity of the inner edge when the first polarizer 17 is in the first rotation position, that is, when the first polarizer 17 and the second polarizer 19 are in a parallel Nicols relationship. Only the eight chip LED light sources 24i are caused to emit light, and the chip LED light source 24o near the outer edge is turned off.
  • the light source unit 16 is disposed near the inner edge when the first polarizer 17 is in the second rotational position, that is, when the first polarizer 17 and the second polarizer 19 are in a vertical Nicol relationship.
  • the chip LED light source 24o near the outer edge which is another light source of the chip LED light source 24i, is also caused to emit light. Therefore, when the first polarizer 17 and the second polarizer 19 are in a vertical Nicol relationship, the light source unit 16 increases the amount of illumination light as a whole as compared with a parallel Nicol relationship.
  • the imaging apparatus 10 can be downsized, the image of the surface of the subject or the image below the surface can be clearly captured, and the first The relationship between the polarizer 17 and the second polarizer 19 can be detected and the manufacturing process can be simplified.
  • the light source unit 16 is more illuminating light than in a parallel Nicol relationship. Increase the amount of light. Since most of the linearly polarized light is reflected on the surface of the subject and the remaining part is indirectly reflected inside the surface, the average light intensity of the entire image of the optical image of the surface that maintains linearly polarized light changes in the polarization state. It is larger than the average light amount of the entire image of the optical image inside the surface. Therefore, as in the imaging apparatus of the present embodiment, the illumination light is illuminated with brightness suitable for imaging in each state by increasing the amount of illumination light in the vertical Nicol state than in the parallel Nicol state. It becomes possible.
  • the light source unit 16 when the first polarizer 17 and the second polarizer 19 are in a vertical Nicole relationship, the light source unit 16 is determined to emit light when in a parallel Nicol relationship. In addition to some chip LED light sources 24i, light is emitted from other chip LED light sources 24o. In order to capture an optical image by direct reflection of the subject clearly, it is preferable that the amount of scattered light is small. Therefore, some LEDs that are closest to the hole 14 that exposes the subject to the optical system 20 when the imaging apparatus 10 according to the second embodiment is in a parallel Nicol state for capturing an optical image by direct reflection. Only the chip light source 24i emits light. Therefore, it is possible to clearly capture an optical image of the surface of the subject by direct reflection.
  • the first polarizer 17 is rotatably supported, but the second polarizer 19 may be rotatably supported. Moreover, the structure which both can rotate may be sufficient.
  • the number of chip LED light sources 24i and 24o that emit light is changed, thereby changing the overall illumination.
  • the light quantity of the whole illumination light may be changed by adjusting the light quantity of light emitted to each chip LED light source 24i, 24o.
  • the imaging apparatus may have a function of performing focusing in the surface observation mode and using it as the focusing position for internal structure observation based on the focusing position at that time. If necessary, by performing fine adjustment with the focus position as a starting point, it is possible to achieve high-precision focus control even in internal structure observation with low contrast.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Studio Devices (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

Ce dispositif d'imagerie (10) comporte un premier élément polarisant (17), un second élément polarisant (19), une unité de source lumineuse (16) et un élément d'imagerie (22). Le premier élément polarisant (17) et/ou le second élément polarisant (19) sont pris en charge de manière rotative. Le premier élément polarisant (17) et le second élément polarisant (19) peuvent passer de leur relation mutuelle à des nicols parallèles et à des nicols croisés. L'unité de source lumineuse (16) irradie une lumière d'éclairage. La lumière d'éclairage éclaire de manière homogène la totalité d'un sujet lorsque la lumière est polarisée linéairement par le premier élément polarisant (17). L'élément d'imagerie (22) capture une image optique du sujet exposé à la lumière polarisée linéairement par le second élément polarisant.
PCT/JP2013/005451 2012-09-13 2013-09-13 Dispositif et procédé d'imagerie WO2014041818A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-202122 2012-09-13
JP2012202122A JP5964186B2 (ja) 2012-09-13 2012-09-13 撮像装置

Publications (1)

Publication Number Publication Date
WO2014041818A1 true WO2014041818A1 (fr) 2014-03-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015188579A (ja) * 2014-03-28 2015-11-02 カシオ計算機株式会社 ダーモスコープ及びダーモスコープの使用方法
WO2022169397A1 (fr) * 2021-02-04 2022-08-11 Fingerprint Cards Anacatum Ip Ab Dispositif d'imagerie biométrique comprenant des polariseurs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03135276A (ja) * 1989-10-20 1991-06-10 Sukara Kk 撮像装置の撮像ヘッド
JPH0835928A (ja) * 1994-07-20 1996-02-06 Unitec Res Kk 撮像装置
JPH10333057A (ja) * 1997-04-03 1998-12-18 Moritex Corp Ｃｃｄマイクロスコープ
JP2001281734A (ja) * 2000-03-31 2001-10-10 Canon Inc 偏光方向検出装置及びカメラ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004136760A (ja) * 2002-10-17 2004-05-13 Tokai Rika Co Ltd インナミラー
JP4667313B2 (ja) * 2006-07-10 2011-04-13 株式会社モリテックス 偏光照明付観察装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03135276A (ja) * 1989-10-20 1991-06-10 Sukara Kk 撮像装置の撮像ヘッド
JPH0835928A (ja) * 1994-07-20 1996-02-06 Unitec Res Kk 撮像装置
JPH10333057A (ja) * 1997-04-03 1998-12-18 Moritex Corp Ｃｃｄマイクロスコープ
JP2001281734A (ja) * 2000-03-31 2001-10-10 Canon Inc 偏光方向検出装置及びカメラ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015188579A (ja) * 2014-03-28 2015-11-02 カシオ計算機株式会社 ダーモスコープ及びダーモスコープの使用方法
WO2022169397A1 (fr) * 2021-02-04 2022-08-11 Fingerprint Cards Anacatum Ip Ab Dispositif d'imagerie biométrique comprenant des polariseurs
US11995911B2 (en) 2021-02-04 2024-05-28 Fingerprint Cards Ip Ab Biometric imaging device comprising polarizers
EP4288938A4 (fr) * 2021-02-04 2024-07-17 Fingerprint Cards Anacatum Ip Ab Dispositif d'imagerie biométrique comprenant des polariseurs

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Publication number Publication date
JP5964186B2 (ja) 2016-08-03
JP2014057276A (ja) 2014-03-27

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