Molded plastic lens

Details Molded plastic lens Molded plastic lens

1998-04-29

2000-04-18

Sugarman, Scott J.

Optical: systems and elements

Lens

359811, 359819, G02B 300, G02B 702

Patent

active

060522321

ABSTRACT:
A plastic lens is molded from a suitable transparent thermoplastic resin, and has a lens body and an annular portion integrally formed around the lens body. The annular portion has an annular surface, as a first positioning surface, extending perpendicularly from a peripheral outer edge of a lens surface of the lens body with respect to an optical axis of the lens body, and a peripheral cylindrical surface, as a second positioning surface, extending perpendicularly with respect to the first positioning surface. A right-angled annular corner, defined by an intersection of a hypothetical extension of the first positioning surface and a hypothetical extension of the second positioning surface, is eliminated.

REFERENCES:
patent: 4183661 (1980-01-01), Ohkura
patent: 5257145 (1993-10-01), Kanazawa et al.
patent: 5290620 (1994-03-01), Shono
patent: 5757559 (1998-05-01), Nomura

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