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. 01, 1997
Filed:
Feb. 04, 1994
Satoshi Yamazaki, Tokyo, JP;
Ryuji Horiguchi, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
A hologram which contains the record of a parallel bar-shaped pattern, like a bar code pattern, and which can be read with a single light-receiving element of simple structure with fewer restrictions on the installation position of the light-receiving element and with a minimal lowering in the read accuracy even if the light-receiving element is disposed a little out-of-position. Also disclosed is a method of reading such a hologram. A hologram is recorded in a region that extends in a direction intersecting each bar of a reconstructed bar-shaped pattern and that is not shorter than the length of the reconstructed bar-shaped pattern at least in the above-described direction. Alternatively, the hologram is recorded in a stripe region elongated at the above-described direction. The hologram is read by illuminating it with a reconstructing light beam of small diameter which illuminates only a limited portion of the recording region, receiving diffracted light from the hologram with a single light-receiving element at a position which is coincident with an imagery position where an image of the bar-shaped pattern is formed, or closer to the hologram than imagery position, and at which beams of diffracted light from the hologram are separate from each other, and moving the hologram relative to the reconstructing light beam and the single light-receiving element in a direction intersecting each bar of the reconstructed bar-shaped pattern.