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:
Oct. 08, 1991
Filed:
Apr. 14, 1989
Applicant:
Inventor:
Yoshihiro Kishida, Kyoto, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358459 ; 358456 ; 358458 ; 358465 ; 358466 ;
Abstract
An image scanner for producing a halftone image is provided with a halftone signal generator which generates an exposure signal (S) for controlling the exposure duration of a laser beam (L) which beam is focused on a photosensitive material. The halftone signal generator is so constructed that image data (N) is compared with a threshold data (screen pattern data) for each elementary area and the exposure duration for each elementary area is determined mainly according to a difference between the image data and the threshold data. Some of the elementary areas are partially exposed, to an extent which depends on the exposure duration.