Optical lens and mold for molding the same

Details Optical lens and mold for molding the same Optical lens and mold for molding the same

1996-11-26

1998-10-13

Nelms, David C.

Optical: systems and elements

Lens

Including a nonspherical surface

G02B 302

Patent

active

058221344

ABSTRACT:
An optical lens press-molded so that within at least the optically effective diameter thereof, the thickness thereof may become greater from the center of the optical axis thereof toward the marginal portion of the lens, characterized in that at least one of the both lens surfaces thereof is a spherical or aspherical concave lens continuous from a transferred surface formed so that in the area outside the optically effective diameter thereof, the thickness of the lens may be limited away from the extension of a curved surface of a radius of curvature setting the optically effective diameter toward the outer diameter of the lens, and forming the transferred surface up to at least the required outer diameter of the lens, and a free surface portion is left outside the outer diameter of the lens during molding.

REFERENCES:
patent: 3202046 (1965-08-01), Roos
patent: 4279480 (1981-07-01), Bettiol et al.
patent: 4698089 (1987-10-01), Matsuzaka et al.
patent: 4756737 (1988-07-01), Yoshimura et al.
patent: 5188650 (1993-02-01), Nomura
patent: 5191324 (1993-03-01), Rydel
patent: 5227917 (1993-07-01), Kubo et al.
patent: 5250099 (1993-10-01), Kubo et al.
patent: 5275637 (1994-01-01), Sato et al.
patent: 5365377 (1994-11-01), Sato
patent: 5435818 (1995-07-01), Mashige et al.

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