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:
Mar. 03, 2009
Filed:
Oct. 23, 2007
Yuji Kamiya, Abiko, JP;
Yuji Kamiya, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus including (a) a γ conversion unit having a γ conversion table γαof a first one Vcontα of a designation development contrast in a case that a development contrast correction amount ΔVcontis a first value, and a γ conversion table γβ, different from the γ conversion table γα, of a second one Vcontβ, different from the first one Vcontα, of the designation development contrast in a case that the development contrast correction amount ΔVcontis a second value different from the first value, and (b) an arithmetic operation unit for calculating a γ conversion table γNowof a third one VcontNow of the designation development contrast in a case that the development contrast correction amount ΔVcontis a third value, based on a formula: γNow=γα+(γβ−γα)×(Vcontα−VcontNow/(Vcontα−Vcontβ), wherein the subscript i is a value of an output density signal in the γ conversion table. The γ conversion unit conducts the γ conversion of the third one VcontNow of the designation development contrast, based on the γ conversion table γNowcalculated by the arithmetic operation unit.