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. 05, 1989
Filed:
Mar. 28, 1989
Applicant:
Inventors:
Assignee:
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 41 ; 355 45 ; 355 68 ;
Abstract
A negative-positive microfilm discriminating system for use in a microfilm reader/printer apparatus, comprising a reflector mirror for projecting a beam of light bearing an image detected from a microfilm strip, a sensor disposed in the path of light from the reflector mirror for detecting the densities in each of a plurality of blocks of a patterned image zone of the microfilm strip, and a control circuit for selecting out of the blocks the blocks having acceptable degrees of contrast, determining whether the image zone within each of the selected blocks is a negative or is a positive and determining whether the micrifilm strip is a negative or is a positive.