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:
Oct. 28, 2003
Filed:
May. 16, 2001
Tetsuya Matsuyama, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
The invention provides a hologram recording or replicating optical system wherein a misalignment-with-time of the center of a laser generated beam is automatically corrected so that the color balance in a color hologram surface, for instance, can be well maintained with no disturbance. In the hologram recording or replicating optical system for irradiating a photosensitive material with a beam from a laser through a pinhole a beam position correcting mechanism and a beam splitter are located in an optical path between the laser and the pinhole , and a laser beam position detector is located at a position in an optical path split by the beam splitter and conjugate to the pinhole so that the beam position correcting mechanism can be operated on the basis of a beam position error signal obtained from the laser beam position detector to keep the position of the beam incident on the pinhole always constant.