US 5,889,599 A · Holography imaging apparatus holography display apparatus holography imaging method and holography display method

Abstract

A diaphragm having an aperture, the size of which is equal to or smaller than .lambda.f/p (.lambda. is the wavelength, p is the imaging resolution, and f is the focal length of an imaging optical system) is arranged on the focal plane of the object space of the imaging optical system, and object light via the aperture is imaged by the imaging optical system. The object light via the imaging optical system and reference light are brought to interference to form interference fringes, and an image of the interference fringes is sensed. Using the hologram sensed in this manner, the image of the object to be sensed is reconstructed by adopting an imaging optical system equivalent to that upon imaging, and setting the positional relationship between the formed hologram and the imaging optical system in correspondence with that between the imaging optical system and the imaging surface upon imaging. In this way, a holography imaging apparatus which can vary the field of view and can sense a high-quality hologram using an imaging device having a relatively low spatial resolution is realized, and a holography display apparatus which can display an image by eliminating distortion with respect to the original image from a hologram sensed by the holography imaging apparatus of this invention is realized.

Claims11

Dependent claims

A holography imaging apparatus comprising:

a light source for irradiating an object to be sensed;
diaphragm means with an aperture which transmits object light, said object light being that portion of the light irradiated light onto said object that has been reflected by said object;
an imaging optical system having a positive refractive power and variable front focal length and being so arranged to dispose said diaphragm at front focal plane thereof;
interlocking means for changing a distance between said diaphragm means and said imaging optical system and the aperture size of said aperture in response to changes in the front focal length of said imaging optical system;
an interference optical system to interference said object light transmitted through said imaging optical system and reference light as plane waves from said light source;
and
image sensing means to record an interference image outputted by said interference optical system and formed on the imaging surface which is perpendicular to an optical axis of said imaging optical system and at a first distance from a back focal plane of said first imaging optical system,
wherein the following relation holds:
a.multidot..lambda..multidot.f/p
where .lambda. is the wavelength of the object light, a is the aperture diameter of said diaphragm means, f is a front focal length of said imaging optical system, and p is the spatial resolution of said image sensing means.

7 more elements

Dependencies are inferred from the claim text.

Holography imaging apparatus holography display apparatus holography imaging method and holography display method

Life of this patent

Holography imaging apparatus holography display apparatus holography imaging method and holography display method

Life of this patent

Abstract

Claims11