Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-08-14
2007-08-14
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
Reexamination Certificate
active
10991376
ABSTRACT:
A two-dimensional scanning apparatus has light source means, deflecting means for deflecting a beam emitted from the light source means in a two-dimensional direction, and scanning optical means for directing the beam deflected by the deflecting means onto a surface to be scanned. The scanning optical means has one or more scanning optical element, and one or more surfaces of one or more of the aforementioned one or more scanning optical elements are anamorphic surfaces, and the anamorphic surfaces on the aforementioned one or more surfaces are anamorphic surfaces monotonously changing in a radius of curvature of which the absolute value of the radius of curvature in a first one-dimensional direction continuously decreases from one side toward the other side along a second one-dimensional direction orthogonal to the first one-dimensional direction. Thus, there can be supplied a two-dimensional scanning apparatus which can well correct TV distortion caused by the two-dimensional deflection of the beam by the deflecting means and trapezoid distortion caused by an image being obliquely projected onto a surface to be scanned, and a scanning type image displaying apparatus using the same.
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Canon Kabushiki Kaisha
Cherry Euncha P.
Fitzpatrick ,Cella, Harper & Scinto
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