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US 5,496,993 AGranted
Optical pickup device with wedge shaped and concave lens for correcting a coma and astigmatism
AssigneeKabushiki Kaisha Sanko Seiki Seisakusho
InventorIkuo Kasuga
Life of this patent
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Abstract
Disclosed is an optical pickup device comprising a light source for irradiating a light beam onto an object from a light source, a half mirror for introducing said light beam reflected by the object to an optical detector; and a wedge-shaped photosensitive element, disposed between said half mirror and said optical detector, for cancelling out a coma produced by said half mirror.
Claims5
An optical pickup device comprising:
- a light source for irradiating a light beam onto an object from a light source;
- a half mirror for introducing the light beam reflected by the object to an optical detector;
- and
- a wedge-shaped optical element, disposed between said half mirror and said optical detector, for cancelling out a coma produced by said half mirror, wherein
- said wedge-shaped optical element has a surface formed by combining a wedge form and a cylindrical form, and wherein
- said surface of said wedge-shaped optical element on said half mirror side is a concave cylindrical surface.
3 more elements
An optical pickup device comprising:
- a light source for irradiating a light beam onto an object from a light source;
- a half mirror for introducing the light beam reflected by the object to an optical detector;
- and
- a wedge-shaped optical element, disposed between said half mirror and said optical detector, for cancelling out a coma produced by said half mirror, wherein
- said wedge-shaped optical element has a surface formed by combining a wedge form and a cylindrical form, and wherein
- said surface of said wedge-shaped optical element on said optical detector side is a concave cylindrical surface.
3 more elements
An optical pickup device comprising:
- a light source for irradiating a light beam onto an object from a light source;
- a half mirror for introducing said light beam reflected by the object to an optical detector;
- and
- a wedge-shaped optical element, disposed between said half mirror and said optical detector, for cancelling out a coma produced by said half mirror, wherein said wedge-shaped optical element has a surface formed by combining a wedge form and a cylindrical form.
1 more element
Dependencies are inferred from the claim text.