Method of stabilizing resonant frequency and resonant scanner us

Details Method of stabilizing resonant frequency and resonant scanner us Method of stabilizing resonant frequency and resonant scanner us

1990-11-09

1993-09-21

Bovernick, Rodney B.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359213, 318128, 310 36, G02B 2608

Patent

active

052473848

ABSTRACT:
A method of the present invention for stabilizing the resonant frequency of a resonant scanner is that thermal energy of the same amount as the heat generated in an optical scanning mode is applied to the scanner section in a non-scanning mode to insure that the variation of the temperature of the resonant light deflector will lie within a predetermined range, whereby the resonant frequency of the oscillation of the reflecting mirror is stabilized. The resonant scanner of the present invention in which the scanner section is heated in the non-scanning mode by supplying the drive coil with an electric current that has a non-resonant frequency or with the heater is constructed. The resonant scanner using the method is capable of achieving precise optical scanning that has an improved dimensional precision in the sub-scanning direction.

REFERENCES:
patent: 4214154 (1980-07-01), Sato
patent: 4370019 (1983-01-01), Shirasaki
patent: 4502752 (1985-03-01), Montagu
patent: 4686363 (1987-08-01), Schoon
patent: 4738500 (1988-04-01), Grupp et al.
patent: 4855761 (1989-08-01), Hiiro
patent: 4874215 (1989-10-01), Montagu
patent: 4990808 (1991-02-01), Paulsen

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