The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 2005
Filed:
Jun. 19, 2002
Nobuhiro Kihara, Kanagawa, JP;
Megumi Ezura, Tokyo, JP;
Akira Shirakura, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An image exposure recorder for exposure-recording a holographic stereogram image or a hologram image on a recording medium for hologram. The recorder has an inverse correction system for rotating the polarization plane of a reference light (R) by means of a half-wave plate (), directing the reference light (R) to a hologram recording medium (), and measuring the intensity of a part of the reference light (R) transmitted through a polarizer () out of the reference light (R) transmitted through a part of the area of the hologram recording medium by means of a photodetector (). In the inverse correction system, the angle of rotation of the half-wave plate is so determined that the intensity of the reference light (R) determined by the photodetector may be minimum or maximum. Therefore the degradation of the coherence between the object light and the reference light attributed to the transmission of the object and reference lights through the hologram recording medium having birefringence is prevented, and thus a holographic stereogram for reproducing a bright holographic stereogram image is fabricated.