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Class Information
Number: 399/235
Name: Electrophotography > Image formation > Development > Development prevention > Bias voltage
Description: Subject matter wherein an electrical potential prevents unwanted toner from being applied.

Patents under this class:

Patent Number Title Of Patent Date Issued
8660448 Image forming apparatus and image forming method Feb. 25, 2014
8447215 Image forming apparatus and method May. 21, 2013
8351826 Image forming method, image forming device, and image forming program Jan. 8, 2013
8116647 Image forming apparatus and method for controlling same Feb. 14, 2012
7991311 Image forming apparatus and method for controlling developing bias voltage Aug. 2, 2011
7877032 Image forming apparatus Jan. 25, 2011
7693437 Image forming apparatus Apr. 6, 2010
7454149 Image forming apparatus Nov. 18, 2008
7308221 High developing voltage supply apparatus Dec. 11, 2007
7079798 Toner transfer back suppressing color image forming apparatus Jul. 18, 2006
6507718 Method and apparatus for reducing adhesion of carrier to image bearing member Jan. 14, 2003
6353720 Image developing device using a toner as a developer Mar. 5, 2002
6263178 Method of applying a bias voltage for image development and method of switching the bias voltage in an image forming apparatus Jul. 17, 2001
6219499 Developing apparatus and method of applying developing bias therefor Apr. 17, 2001
5999777 Image forming apparatus capable of temporarily breaking the contact between the developer and the photosensitive drum with use of electric field Dec. 7, 1999
5970280 Image forming apparatus having a developing bias control unit Oct. 19, 1999
5956550 Method and device for preventing formation of background image in electrophotographic image forming apparatus Sep. 21, 1999
5897243 Electrophotographic recording apparatus configured to switch a bias voltage in a developing unit Apr. 27, 1999
5848337 Electrical biasing scheme for preventing overplating in an image-on-image electrostatographic printing system Dec. 8, 1998
5826146 Color image forming device which changes developing bias when switching between developer units Oct. 20, 1998
5826144 Developing device for an electrophotographic recording apparatus including bias control of a toner supplying roller Oct. 20, 1998
5771423 Image forming apparatus Jun. 23, 1998
5768665 Image forming apparatus with bias control to prevent undesirable toner deposition Jun. 16, 1998
5671470 Color image forming device which changes developing bias when switching between developer units Sep. 23, 1997
5627631 Developer replenishing device and developer container for use therewith May. 6, 1997
5572302 Electrode wire positioning for scavengeless development Nov. 5, 1996
5426487 Image forming apparatus having bimodal charging means Jun. 20, 1995
5404213 Electrophotographic printing apparatus capable of printing images by electrophotographic processing and its start-up method Apr. 4, 1995
5270783 Image forming equipment having improved toner sensing Dec. 14, 1993
5253017 Image forming apparatus Oct. 12, 1993
5194901 Image forming apparatus having means for preventing toner deposit on photosensitive member Mar. 16, 1993
5155533 Bias application control device for image forming equipment Oct. 13, 1992
5146285 Image forming apparatus Sep. 8, 1992
5032870 Electrophotographic apparatus Jul. 16, 1991
5003353 Electrophotographic printer with developing unit employing two-component toning system Mar. 26, 1991
4990961 Electrophotographic apparatus with variable bias voltage Feb. 5, 1991
4984021 Photoreceptor edge erase system for tri-level xerography Jan. 8, 1991
4984022 Image forming apparatus having means for attenuating bias voltage of the developing sleeve Jan. 8, 1991
4916491 Control device for a copier Apr. 10, 1990
4888621 Multiple image forming apparatus with charger to prevent disturbance of already-transferred images Dec. 19, 1989
4811046 Tri-level highlight color printing apparatus with cycle-up and cycle-down control Mar. 7, 1989
4809038 Color electrophotographic apparatus and method Feb. 28, 1989
4791452 Image forming apparatus having at least two-color image print function and method for controlling the same Dec. 13, 1988
4714942 Reversal image development type electrophotographic printing system Dec. 22, 1987
4610528 Electrophotographic copying machine with delayed development bias voltage application Sep. 9, 1986
4600294 Image forming apparatus with detector and control Jul. 15, 1986
4192604 Bias voltage source for applying a bias voltage on a magnetic brush means of an electrostatic printing apparatus Mar. 11, 1980
3982830 Magnetic bead carryout reduction by altering the developer's bias voltage Sep. 28, 1976

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