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US 7,406,223 B2Granted
Optical element and method of molding the same
AssigneeFujinon Corporation
InventorTakashi Ito
Life of this patent
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Abstract
The present invention provides an optical element capable of preventing a ghost in the use for a sensor such as a CCD or CMOS. In the optical element including an optical function surface of high surface accuracy and a flange formed around the surface, the optical function surface having an optical surface diameter somewhat larger than an effective diameter in order to secure high surface accuracy for the effective diameter, a parting diameter of a molding die is made larger than the optical surface diameter and a parting position is disposed outside the optical surface diameter.
Claims2
An optical device, comprising:
- an optical element;
- an optical element arrangement mounting said optical element and defining an effective diameter of said optical element;
- said optical element including:
- an optical function surface of high surface accuracy;
- a flange formed around the optical function surface;
- the optical function surface having an optical surface diameter larger than said effective diameter providing high surface accuracy for an effective diameter area defined by the effective diameter;
- and
- the optical clement having a core mold transferred surface including said optical function surface, said core mold transferred surface being defined by a core mold of molding die, the core mold having a parting diameter larger than the optical surface diameter on the same surface of the optical element, and a parting position is disposed outside the optical surface diameter;
- whereby the core mold is adapted such that no burrs occur on the optical function surface, thereby preventing ghosts and flares from occurring in the optical element arrangement.
6 more elements
Dependencies are inferred from the claim text.