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:
Aug. 07, 1984
Filed:
Aug. 06, 1982
Kensaku Takahashi, Hiratsuka, JP;
Yasuo Yatsugake, Odawara, JP;
Fukuo Iwaya, Tokyo, JP;
Makoto Ito, Hadano, JP;
Katsumi Takami, Tokyo, JP;
Kyo Suda, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Electronics Engineering Co., Ltd., Tokyo, JP;
Abstract
A light beam scanning apparatus projects a light beam swept by a light scanner to a spherical mirror and scans by a light beam spot reflected and focused by the spherical mirror a surface of an object arranged to oppose to the spherical mirror at a position spaced from the spherical mirror by a distance equal to a focal distance f of the spherical mirror. An optical path length between the light scanner and the spherical mirror is set to 0.78 f-0.84 f to minimize a curvature of field (circle of confusion).