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:
Aug. 31, 1993
Filed:
Oct. 01, 1991
Motonobu Kawabata, Kyoto, JP;
Kenji Hiromatsu, Kyoto, JP;
Abstract
An image recording apparatus modulates a laser beam based on an image signal and a reference clock, and then controls a polygon mirror to irradiate the laser beam on a surface of a photosensitive material. A reference clock generating circuit generates a reference clock having a frequency in proportion to a main scanning speed of a beam spot which is changed during each scanning due to a characteristic of an f.multidot..theta. lens. The reference clock generating circuit includes a line memory which has a bit per address and stores a relationship between an incident angle .theta. of the laser beam on the f.multidot..theta. lens and an image height of the whole valid scanning area, an address counter for designating the addresses serially at a fixed speed so that the data stored in the line memory can be read out address by address serially from a starting point to a finishing point of the valid scanning area, a waveform shaping circuit for generating a clock pulse from the bit data from the line memory, and a multiplying circuit for multiplying a frequency of the clock pulse by an integer of no less than 2.