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Digital holography device and phase shifting array

外国特許コード F120007026
掲載日 2012年11月19日
出願国 欧州特許庁(EPO)
出願番号 08851644
公報番号 2224291
公報番号 2224291
出願日 平成20年11月21日(2008.11.21)
公報発行日 平成22年9月1日(2010.9.1)
公報発行日 平成28年6月29日(2016.6.29)
国際出願番号 JP2008071246
国際公開番号 WO2009066771
国際出願日 平成20年11月21日(2008.11.21)
国際公開日 平成21年5月28日(2009.5.28)
優先権データ
  • 2008JP071246 (2008.11.21) WO
  • 特願2007-303127 (2007.11.22) JP
  • 特願2008-031965 (2008.2.13) JP
発明の名称 (英語) Digital holography device and phase shifting array
発明の概要(英語) DIGITAL HOLOGRAPHY DEVICE AND PHASE PLATE ARRAY Provided is a digital holography device (1) having a simple configuration and an improved image quality, including: a light source (4) that emits light, the light source being provided for supply of object light beams formed by radiation, transmission, scattering, reflection, or diffraction of the emitted light from a subject (6); an array device (2) that splits the light emitted from the light source (4) into two kinds of reference light beams having different phases in a plane perpendicular to a direction in which the light emitted from the light source (4) travels; a CCD camera (3) having an image-capturing plane (13) on which two kinds of interference fringe patterns are recorded, the interference fringe patterns being formed by interferences between the two kinds of reference light beams, which have been produced by the array device (2), and the object light beams, which have been formed by radiation, transmission, scattering, reflection, or diffraction from the subject (6); and an image reconstruction device that generates a reconstructed image of the subject (6) from the two kinds of interference fringe patterns recorded on the image-capturing plane (13).
特許請求の範囲(英語) [claim1]
1. A digital holography device comprising: a light source that emits light, wherein the emitted light comprises reference light and object light; a phase-shifting element that splits the reference light emitted from the light source into two kinds of reference light beams having different phases in a plane perpendicular to a direction in which the light emitted from the light source travels; image-capturing means having an image-capturing plane on which two kinds of interference fringe patterns are recorded, the interference fringe patterns being formed by interferences between the two kinds of reference light beams and an object light beam formed by radiation, transmission, scattering, reflection, or diffraction of object light from a subject; and an image reconstruction device that generates a reconstructed image of the subject according to the two kinds of interference fringe patterns recorded on the image-capturing plane, the device being characterized in that the phase-shifting element is an array device that has two kinds of phase-shifting regions arranged in a checkerboard pattern in the plane perpendicular to the direction in which the light emitted from the light source travels, the reference light beams having intensities that are higher than intensities of the object light beam.
[claim2]
2. The digital holography device according to claim 1, wherein
the image-capturing means is a CCD camera or a CMOS image sensor camera, and
the two kinds of regions are arranged to respectively correspond to pixels of the image-capturing means.
[claim3]
3. The digital holography device according to claim 1, wherein
the phase-shifting element splits the reference light into a first reference light beam having a phase that serves as a reference phase for phase shift measuring means and a second reference light beam that is out of phase with the first reference light beam in an amount of more than 0 and less than or equal to pi radians.
[claim4]
4. The digital holography device according to claim 1, wherein the light source emits linearly polarized light having first-direction polarized components and second-direction polarized components,
the digital holography device/ further comprises a polarization beam splitter that provides the object light having the first-direction polarized components, and provides reference light having the second-direction polarized components, and
the phase-shifting element has: a wavelength-plate optical-medium array device that splits the light beams having the second-direction polarized components into two kinds of reference light beams having different phases in a plane perpendicular to a direction in which the light beams having the second-direction polarized components travel; and a polarizer that transmits third-direction polarized light components of the object light beams and third-direction polarized light components of the two kinds of reference light beams.
[claim5]
5. The digital holography device according to claim 4, wherein
the phase-shifting element is integral with the image-capturing means.
[claim6]
6. The digital holography device according to claim 4, wherein
the wavelength-plate optical-medium array device has: optical media that transmit the light beams having the second-direction polarized components; and 1/4 wavelength plates that shift phases of the light beams having the second-direction polarized components and transmit the light beams thus phase-shifted.
  • 出願人(英語)
  • NATIONAL UNIVERSITY KYOTO INSTITUTE TECHNOLOGY
  • 発明者(英語)
  • AWATSUJI YASUHIRO
  • KANEKO ATSUSHI
  • KOYAMA TAKAMASA
  • TAHARA TATSUKI
  • WAKAMATSU TAKESHI
国際特許分類(IPC)
指定国 Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
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