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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 |
| 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 |
| 6845222 |
IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS FOR SUPPRESSING MOVEMENT OF DEVELOPER ONTO THE ELECTROSTATIC LATENT IMAGE CARRIER WHEN THE VOLTAGES APPLIED TO THE CHARGING AND DEVELOPING DEVI |
Jan. 18, 2005 |
| 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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