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:
Sep. 15, 1992
Filed:
Jul. 17, 1990
Masaaki Nishiyama, Toyohashi, JP;
Shigeo Ogino, Toyokawa, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
There is disclosed an image forming apparatus having a function for correcting the gradation characteristic of an image formed so as to be linear to the gradation degree. The image forming apparatus has a correction circuit for correcting inputted graduatin data to gradation data having a number of gradation degrees larger than that of the inputted gradation data to represent gradation data of a document image more precisely, for example in a range of low gradation. There is also disclosed a test mode for detecting an actual .gamma.-characteristic of the image forming apparatus by measuring toner densities of test images formed on a recording medium beforehand.