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US 2014/0232026 A1Published application
Method for manufacturing diffractive optical element
AssigneePanasonic Corporation
InventorsToshiaki Takano, Yoshiyuki Shimizu, Tetsuya Suzuki, Koji Fujii
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Abstract
A diffractive optical element includes a diffractive surface. Raised portions and recessed portions are alternately arranged on the diffractive surface. A shape of the valley bottoms of the recessed portions varies according to regions of the diffractive surface.
Claims3
A method for manufacturing a diffractive optical element, comprising steps of:
- preparing a die having an inverted shape relative to a shape of a diffractive surface of the diffractive optical element;
- and
- forming, by pressing a glass material with the die, the diffractive optical element having the diffractive surface,
- wherein raised and recessed portions are alternately arranged on the diffractive surface,
- a shape of valley bottoms of the recessed portions in a central region of the diffractive surface is different from that in an outer region located outside the central region, and
- each valley bottom of the recessed portions is formed to have a chamfered shape.
3 more elements
Dependencies are inferred from the claim text.