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:
Jul. 14, 1981
Filed:
Dec. 18, 1978
Yoshikazu Nakayama, Hirakata, JP;
Fumikazu Tateishi, Hirakata, JP;
Katsuyuki Fujito, Higashiosaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Holographic reconstructing apparatus capable of exchanging a hologram memory plate and having a large memory capacity, wherein the position of the memory plate relative to an irradiating laser beam can be accurately controlled. A beam irradiated from a laser source is deflected by a light deflector and is selectively directed to a selected hologram to be read or directed intermittently to a region for dividing the laser beam into a plurality of laser beams. The intensity of each divided laser beam is detected by a light detector, and the detection signal is fed back to control the working point of the light deflector such that the center of the laser beam irradiates the center of the luminous laser beam dividing region. The working point is held until the light deflector again directs the laser beam to the dividing region so that the laser beam radiates a selected hologram on the hologram plate accurately.