US 4,067,638 AGranted

Multi-color holographic stereograms

AssigneeCanon Kabushiki Kaisha

InventorsAkio Yano, Kazuya Matsumoto

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Abstract

A plurality of multicolored transparencies or pictures having different parallactic views of a scene are aligned with each other and illuminated by red, green, and blue coherent beams. The resulting images are focused on a holographic recording medium through an aperture elongated along the direction of the alignment of the pictures. A hologram is recorded by red, green, and blue coherent reference beams directed at the recording medium. The images are reconstructed with a white reconstructing beam or a reconstructing beam composed of quasi-monochromatic colors and observed through an aperture corresponding to the first aperture and arranged in the same position. The hologram has recorded thereon a focused image hologram of the pictures and a Fresnel hologram of the aperture. The reconstructed image may be expanded by a screen which is directive in one direction, i.e. retroreflective horizontally, and dispersive in another direction, i.e. vertically dispersive.

Claims6

Dependent claims

A method for recording and reconstructing a color focused image hologram, comprising a recording step and reconstructing step, said recording step including,

arranging a plurality of two-dimensional multi-color pictures along a predetermined line,
illuminating said plurality of two-dimensional multi-color pictures with coherent light beams having mutually different wavelengths,
projecting images of the pictures on a screen which focuses in a direction parallel to said predetermined line,
transferring a plurality of projection images formed on the screen to a holographic recording medium using an image-forming lens,
placing a masking member having an elongated aperture between the screen and the medium,
orienting the elongated dimension of the aperture parallel to the predetermined line,
and directing reference light beams having mutually different wavelengths to the medium so as to record the hologram and so that the plurality of two-dimensional multi-color pictures are recorded as focused image holographic recordings and the masking member is recorded as a Fresnel holographic recording, and so that the recordings produce color dispersion greater in a direction in the plane of the hologram transverse to the predetermined line than in the direction parallel thereto,
said reconstructing step including directing reconstruction beams having mutually different wavelengths onto the hologram so as to reconstruct both true color images and color cross modulation images of the plurality of two-dimensional pictures in the plane of the hologram, and at the same time, reconstruct both true color images and color cross modulation images of the masking member remote from the hologram,
and placing a light blocking member having an elongated aperture so as to block said color cross modulation images of the masking member.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/609,050Filed 29 Aug 1975 · continuation
Priority: JA 46-993248 Dec 1971
Granted: 10 Jan 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G03H 1/268
Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique: holographic…
G03H 1/0402
Processes or apparatus for producing holograms: recording geometries or arrangements
G03H 1/2205
Reconstruction geometries or arrangements: using downstream optical component
G03H 2001/2271
Multicoloured holobject: rGB holobject