Photocopying – Contact printing – Light boxes
Patent
1994-12-05
1996-01-23
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
324452, G01R 2924, G03G 1508
Patent
active
054869005
ABSTRACT:
A measuring device for an amount of charge of toner including countered first and second electrodes for forming an electric field which accelerates toner particles, a voltage generator for applying a voltage across the first and second electrodes, a magnifying optical system for magnifying the image of toner particles which move between the first and the second electrodes, a light source for illuminating a vicinity of a focus of the magnifying optical system, a CCD sensor for receiving an optical image of the toner particles magnified by the magnifying optical system so as to convert the optical image into an image signal and a CPU for controlling a voltage from the voltage generator based upon the image signal so that the toner particles pass a prescribed position in the vicinity of the focus of the magnifying optical system and for obtaining an amount of charge of toner particles from a value of the voltage, and an image forming apparatus in which the measuring device is installed. The measuring device for an amount of charge of toner becomes compact, so it can be installed in an image forming apparatus.
REFERENCES:
patent: 4375673 (1983-03-01), Lewis et al.
patent: 4633714 (1987-01-01), Mazumder et al.
patent: 5266900 (1993-11-01), Epping
Patent Abstracts of Japan, vol. 12, No. 175 (P-707), May '88, abstracting JP 62-287 169 of Dec. '87.
Patent Abstracts of Japan, vol. 13, No. 209 (P-871) [3557], May '89, abstracting JP 1-025 154 of Jan. '89.
Y. Takahashi et al., "Triboelectric Charge Polarity and its Distribution on Toner Particles", in Proceedings--The Fifth International Congress on Advances in Non-Impact Printing Technologies, San Diego, Calif., Nov. '89, pp. 206-212.
Patent Abstracts of Japan, vol. 16, No. 189 (P-1348), May '92 abstracting JP 4-025 772 of Jan. '92.
Taniguchi Keiji
Wada Takasumi
Yamamoto Yo-ichi
Conlin David G.
Oliver Milton
Pendegrass Joan H.
Sharp Kabushiki Kaisha
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