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:
Jun. 30, 1992
Filed:
Jul. 16, 1991
Yoshiyuki Ban, Chita, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
In an image forming device using a laser beam having light components of three wavelengths, a separate memory is provided for storing image data for each of the three light components. A reading controller for each of the light components reads the image data for that light component stored in the memory in accordance with a clock circuit. Each clock circuit has a clock frequency that is set variously according to the wavelength of the light component to correct chromatic distortion (chromatism) in the optics. As such, each color frquency is set to be in proportion to an image width resulting from a scan line for each wavelength of light in order to maintain coincidence between colors at the start of the scan line and at the end of the scan line. Therefore, the head position of each color image in the data sending period is matched by an appropriate delay time for the color light from the detection signal of a photosensor and the image width is corrected by the variation in the frequency of the sending clock of each wavelength.