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. 17, 1998
Filed:
Feb. 11, 1997
Allen J Rushing, Webster, NY (US);
Matthias H Regelsberger, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A reproduction apparatus and method particularly suited for an electrophotographic DAD-CAD system having an electrostatic recording member for supporting an electrostatic image, a primary charger establishes a primary charge on the member, the primary charge being defined by a parameter V.sub.o. An exposure device imagewise modulates the primary charge to form an electrostatic image on the recording member. The device has an exposure parameter E.sub.o. A developer station develops the electrostatic image with charged toner. The developer station has an electrical bias to establish a field for urging movement of the toner to the member. The electrical bias has an alternating current component parameter AC and a direct current parameter DC. A controller controls adjustments to the parameters E.sub.o, V.sub.o and AC by measuring a density parameter D.sub.OUT of an exposed and developed area on the member that is formed by operation of the primary charger, the exposure device and the developer station. The controller includes a calculator for calculating an error, .DELTA.D.sub.OUT in the measured density parameter from a density setpoint and multiplying .DELTA.D.sub.OUT by respective first, second and third constants to obtain respective adjustment values used for adjusting E.sub.o, V.sub.o and AC and wherein in repeated use of the controller to provide repeated adjustment values used for adjusting E.sub.o, V.sub.o and AC a fixed ratio is maintained between said first, second and third constants. The controller is also suited to providing adjustments to DC using a fourth constant.