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MULTIBAND CAMERA, AND MULTIBAND IMAGE CAPTURING METHOD

  • US 20130235256A1
  • Filed: 11/07/2011
  • Published: 09/12/2013
  • Est. Priority Date: 11/16/2010
  • Status: Active Grant
First Claim
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1. A multiband camera for capturing an image of an image capture wavelength region in mutually different wavelength bands divided into four or more bands when capturing an image of a subject, comprising:

  • a band-pass filter that is disposed in a position of a pupil of an optical system and has four or more optical filters for respectively transmitting the wavelength bands divided into four or more bands;

    a microlens array having two-dimensionally arrayed positive microlenses;

    a photoelectric conversion element that is disposed in the vicinity of a focal point of the microlens array and is disposed in or proximal to a conjugate position with the band-pass filter, and includes a plurality of two-dimensionally arrayed pixels on which is incident a flux of light transmitted through the band-pass filter and guided by the microlens array; and

    a measurement unit for measuring a spectral intensity of the flux of light from the subject based on a signal output from the pixels corresponding to the optical filters;

    wherein;

    the expression below is satisfied;

    where Pl is a pitch in a prescribed direction between the microlenses of the microlens array;

    Ps is a pitch in the prescribed direction between the pixels of the photoelectric conversion element;

    n is a number of pixels in the prescribed direction corresponding to one of the microlenses;

    u is an effective dimension in a prescribed direction of the pixels;

    t is a dimension in a prescribed direction of a real image of the band-pass filter formed on the plurality of two-dimensionally arrayed pixels;

    Na is a number of microlenses arrayed in a prescribed direction;

    L is a distance from an exit pupil corresponding to the pupil to the microlens; and

    f (<

    <

    L) is a focal length of the microlens.

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