Title:
METHOD OF STABILIZING LIGHT BEAM INTENSITY AND MODULATOR STABILIZER
Document Type and Number:
Japanese Patent JPS62290267
Kind Code:
A
Abstract:
A scanner with high intensity source beam, a modulator for modulating the source beam to provide a zero order beam and first order writing beam in response to an image signal input, a polygon for scanning the writing beam across a moving recording member to write images thereon, a sensor in the path of the zero order beam providing a first black beam intensity signal while scanning between pages and a second white beam intensity signal while the writing beam scans an image background area, a circuit for differencing the first and second beam intensity signals from one another to provide a composite intensity signal representing the intensity of the source beam, and a second circuit for differencing the composite beam intensity signal from an intensity setpoint signal to provide a correction signal for adjusting the rf power to the modulator to maintain a substantially constant writing beam intensity. In a second embodiment, the correction signal is determined by a successive approximation register.
Inventors:
JIEIMUZU CHIYAARUZU TORIAANO
REON KARUBUIN UIRIAMUZU
KUUOTSUKU RIYUN ITSUPU
JIEI TERENSU FURIN
REON KARUBUIN UIRIAMUZU
KUUOTSUKU RIYUN ITSUPU
JIEI TERENSU FURIN
Application Number:
JP11807487A
Publication Date:
December 17, 1987
Filing Date:
May 14, 1987
Export Citation:
Assignee:
XEROX CORP
International Classes:
G02F1/11; G06K15/12; H04N1/113; H04N1/40; (IPC1-7): G02F1/11; G06K15/12; H04N1/04
Attorney, Agent or Firm:
Minoru Nakamura