Optical scanner for reducing shading
First Claim
1. An optical scanner for reducing shading in which a semiconductor laser or a semiconductor laser array is set to a light source and a laser beam from the light source is deflected by light deflecting means having a deflecting reflecting face and is converged by a lens for scanning as a light spot on a scanned face to perform an optical scanning operation;
- said optical scanner comprising an antireflection coating film means disposed on one or more lens faces of the scanning lens for increasing transmittance of the scanning lens from an optical axis thereof toward both end portions in a main scan-corresponding direction such that transmittance at both end portions is greater than transmittance at the optical axis.
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Accused Products
Abstract
In an optical scanner for reducing shading, a semiconductor laser or a semiconductor laser array is set to a light source and a laser beam from the light source is deflected by a light deflector having a deflecting reflecting face and is converged by a lens for scanning as a light spot on a scanned face to perform an optical scanning operation. The optical scanner has an antireflection coating film disposed on only a refractive face for providing a largest change in incident angle in the deflection of the laser beam with respect to faces of optical elements arranged on an optical path from the light deflector to the scanned face to transmit the laser beam through the optical elements. The optical scanner may have an antireflection coating film disposed on one or more lens faces of the scanning lens such that transmittance of the scanning lens is gradually increased from an optical axis thereof toward both end portions in a main scan-corresponding direction.
63 Citations
11 Claims
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1. An optical scanner for reducing shading in which a semiconductor laser or a semiconductor laser array is set to a light source and a laser beam from the light source is deflected by light deflecting means having a deflecting reflecting face and is converged by a lens for scanning as a light spot on a scanned face to perform an optical scanning operation;
said optical scanner comprising an antireflection coating film means disposed on one or more lens faces of the scanning lens for increasing transmittance of the scanning lens from an optical axis thereof toward both end portions in a main scan-corresponding direction such that transmittance at both end portions is greater than transmittance at the optical axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification