Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-07-11
2006-07-11
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S204200, C359S206100, C359S215100
Reexamination Certificate
active
07075690
ABSTRACT:
An optical scanning device is provided, which includes: a light source unit for emitting at least one light flux having a wavelength equal to or smaller than 500 nm; a deflection unit for deflecting at least one of the light fluxes emitted from the light source unit; and a scanning optical system for imaging the light flux deflected by the deflection unit onto a surface to be scanned. In the optical scanning device, the scanning optical system includes at least two lenses including a glass lens and a plastic lens, each of which has an opposite sign of power, and chromatic aberration of magnification in a main scanning direction in the optical scanning device is corrected to be equal to or smaller than 40 μm in the case where a difference of wavelengths in the light flux emitted from the light source unit is set to 5 nm.
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Ohara Glass Catalog (which can also can be viewed on the internet at http://www.oharacorp.com/PDF/Ohara—Glass—Catalog.pdf).
Canon Kabushiki Kaisha
Cherry Euncha P.
Fitzpatrick ,Cella, Harper & Scinto
Khatri Pranav
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