Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-04-09
2000-02-29
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
B41J 247
Patent
active
060315628
ABSTRACT:
An image forming apparatus of the present invention outputs a laser beam used for image formation in accordance with image data, and reflects said beam by a rotatably driven polygonal mirror having polygonal prism-like lateral surfaces as the reflective surfaces so as to scan a charged surface of a photoconductive member in a main scanning direction and form an electrostatic latent image on said photoconductive member, said image forming apparatus comprising a photoemitter which emits a forced laser beam unrelated to image data before outputting a laser beam for image formation so as to adjust the output timing of said beam used for image formation, photoreceptor which detects the forced laser beam at a predetermined position directly before starting a main scanning of said photoconductive member, calculator which calculates the period of one rotation of said polygonal mirror based on the detection by said photoreceptor, and a controller which controls the rotational speed of said polygonal mirror based on the period of one rotation of said polygonal mirror calculated by said calculator.
REFERENCES:
patent: 4130838 (1978-12-01), St. John
patent: 4872065 (1989-10-01), Isono et al.
patent: 5412302 (1995-05-01), Kido et al.
patent: 5677724 (1997-10-01), Takizawa et al.
Hsieh Shih-Wen
Le N.
Minolta Co. , Ltd.
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