Image forming apparatus

Details Image forming apparatus Image forming apparatus

2008-01-29

2008-01-29

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S213100

Reexamination Certificate

active

11447187

ABSTRACT:
Disclosed is an image forming apparatus capable of keeping an oscillation angle of an oscillating mirror at a constant value based on control of a drive frequency. In this image forming apparatus, a semiconductor laser emits a light beam, and an oscillating mirror reflects the light beam emitted from the semiconductor laser, onto a target surface in a scanning manner. An oscillating-mirror drive circuit unit supplies a drive signal having a feature that a drive voltage varies based on a drive frequency, to the oscillating mirror, to reciprocatingly oscillate the oscillating mirror within a given angular range. A voltage-variation detection circuit detects a variation amount of the drive voltage, and a drive-frequency generation circuit alters the drive frequency depending on the variation amount of the drive voltage detected by the voltage-variation detection circuit.

REFERENCES:
patent: 4135902 (1979-01-01), Oehrle
patent: 4258246 (1981-03-01), Karube et al.
patent: 6717449 (2004-04-01), Tamiya et al.
patent: 7-154544 (1995-06-01), None
patent: 2001-228434 (2001-08-01), None

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