VARIABLE SPECTRAL SCANNER AND DETECTOR PHOTORECEPTOR CHARACTERIZATION SYSTEM
Original Publication Date: 1998-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Disclosed is a method and system for simplifying a photoreceptor (P/R) scanner wherein, for example, a currently employed and costly filter wheel or monochrometer exposure source is replaced by a variable bandpass filter-beam splitter-linear detector array combination. Photoreceptor characterization is typically accomplished with an optical radiation source, such as a tungsten or xenon lamp with narrow bandpass filers mounted in a filter wheel, stepping motors, drive electronics, and the like. This characterization method requires that data be taken during an extended period, for example, at least one P/R revolution, but typically multiple passes. The light energy, along with the photoreceptor discharge values, are then used to determine the spectral responsivity function of the photoreceptor under test. There is also a test to determine the uniformity of the coating and dispersion process at various positions on the photoreceptor. This can be directed to either circumferential or longitudinal uniformity. The proposed replacement arrangement simultaneously exposes the photoreceptor and splits off part of the incident energy to the wavelength and intensity calibrated detector array. The photoreceptor is translated to provide spectral data about a single geographic area of the photoreceptor. The system and method possess many advantages including a cost savings associated with reductions in: components, mechanical complexity, failure rates, and down time.