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:
Dec. 03, 1991
Filed:
Feb. 20, 1990
Yasuaki Nishida, Tokyo, JP;
Yoshihiro Fujita, Tokyo, JP;
Yoshiki Iino, Tokyo, JP;
Norihiko Kawada, Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Ikegami Tsushinki Co., Ltd., Tokyo, JP;
Abstract
An apparatus for picking-up an optical image of object including a lens system for forming the optical image of object, an optical filter for suppressing moire fringes, a color separation system for separating the optical image into green, red and blue color images, and three solid state image sensors for receiving the green, red and blue color images, respectively. The optical filter having a first quartz plate for separating ordinary and extraordinary light rays from each other in a direction of +45.degree. with respect to the horizontal direction, a second quartz plate for separating ordinary and extraordinary light rays from each other in the horizontal scanning direction, and a third quartz plate for separating ordinary and extraordinary light rays from each other in a direction of -45.degree. with respect to the horizontal scanning direction. The optical filter has two trap points, one at a sampling frequency f.sub.s and the other near 1.5f.sub.s, but does not have a trap point wiithin a frequency range below f.sub.s, so that components near f.sub.s as well as at 2f.sub.s, 3f.sub.s, 4f.sub.s and 5f.sub.s can be suppressed to a large extent, while the suppression for components in the base band can be limited effectively.