Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2005-04-26
2005-04-26
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S204200, C359S216100, C347S244000, C347S259000
Reexamination Certificate
active
06885486
ABSTRACT:
Provided is a scanning optical system in which the influence of structural birefringence resulting from a relationship between the arrangement direction of a fine grating structure and polarization planes is reduced to obtain a preferable optical performance, and an image forming apparatus using the scanning optical system. In the scanning optical system, a light flux emitted from a light source unit is deflected by a deflection unit. The light flux deflected by the deflection unit is guided onto a surface to be scanned by a scanning optical unit having a fine structural grating on at least one optical surface. The surface to be scanned is scanned with the light flux. The fine structural grating has a triangular grating in which triangular grating parts are arranged in one dimensional direction. When a grating height of a triangular structure of the triangular grating is given by h, a grating pitch thereof is given by P, and a wavelength of the light flux emitted from the light source unit is given by λ, conditions of 0.23λ≦h and 0.52<h/P are satisfied.
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