Quality control for magnetic images
US4924263A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Apr 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0013
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A printing machine in which magnetically permeable marking particles develop a latent image recorded on a photoconductive member. A read head is positioned adjacent the photoconductive member to detect magnetic field intensity effects produced by the marking particles. In addition, an optical device may be used to transmit a light beam onto the marking particles developed on the latent image and to sense the intensity of the light rays reflected therefrom. The read head alone or in combination with the optical device, generates a control signal. The control signal may be used to regulate one of the processing stations of the printing machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.