Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1991-10-01
1993-08-31
Reinhart, Mark J.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346 11, H04N 121, B41J 2435
Patent
active
052413306
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.
REFERENCES:
patent: 4717925 (1988-01-01), Shibata et al.
patent: 4885594 (1989-12-01), Eguchi
Hiromatsu Kenji
Kawabata Motonobu
Dainippon Screen Mfg. Co,. Ltd.
Reinhart Mark J.
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