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:
Nov. 07, 1989
Filed:
Dec. 16, 1987
Applicant:
Inventor:
Koichi Ise, Chiba, JP;
Assignee:
Sony Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350167 ; 358 44 ; 358331 ;
Abstract
An optical low-pass filter for use in the optical system of a color video camera has first and second periodic structures on the same or opposed major surfaces of a transparent substrate and which are dimensioned and arranged in respect to each other to provide a modulation transfer function, in at least the horizontal scanning direction of the camera, which is higher than a predetermined value for frequencies in a range lower than a cut-off spatial frequency and which is low over a range of frequencies extending from the cut-off spatial frequency to substantially more than twice said cut-off spatial frequency.