The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1988
Filed:
May. 06, 1985
Tetsuo Houki, Kyoto, JP;
Ikuo Mitsuka, Shiga, JP;
Akira Kuwabara, Shiga, JP;
Hitoshi Haibara, Kyoto, JP;
Takashi Sakamoto, Kyoto, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
In image scanning in which three lamps provided for Red, Green and Blue color components are switched successively and light transmitted through or reflected at an original is received by a CCD line photosensor, variation in lamp output light quantity with time and relative variations in output light intensity among the three lamps are corrected. In one embodiment, each lamp is turned off or operation of the CCD is terminated when the light quantity emitted from the lamp reaches a setup quantity. In a second embodiment, a voltage corresponding to the color component data obtained by the CCD is divided by a voltage corresponding to the effective light quantity emitted from each lamp.