Polygon mirror, laser scanning unit having the same, and...

Details Polygon mirror, laser scanning unit having the same, and... Polygon mirror, laser scanning unit having the same, and...

2006-12-28

2009-02-03

Cherry, Euncha P (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S883000

Reexamination Certificate

active

07486427

ABSTRACT:
A polygon mirror of a laser scanning unit includes reflective surfaces to reflect laser beams, and first to third dielectric layers laminated on the reflective surfaces. The second dielectric layer comprises TiO2, which can reduce a reflectivity deviation of the wavelengths of the laser beams to below 2%.

REFERENCES:
patent: 4643518 (1987-02-01), Taniguchi
patent: 5946125 (1999-08-01), Ang
patent: 5953147 (1999-09-01), Brandt et al.
patent: 2001/0024323 (2001-09-01), Yanagi et al.
patent: 2002/0041419 (2002-04-01), Takada et al.
European Patent Office Search Report No. 07107258.1, Sep. 7, 2007.

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