Molded lens having an outer circumference and first and...

Details Molded lens having an outer circumference and first and... Molded lens having an outer circumference and first and...

2005-09-20

2005-09-20

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With support

C264S001330

Reexamination Certificate

active

06947230

ABSTRACT:
A molded lens used in an optical pickup device provided with a plane of incidence having a first optical surface and a plane of emergence having a second optical surface, and a form of an outer circumference of the molded lens is formed by a first straight line portion which is in parallel substantially with a plane including an optical axis, a second straight line portion which is in parallel with the first straight line portion and is symmetric with the first straight line portion about the plane and by two circular arcs each connecting end portions of the first and second straight line portions. A part of a fringe of each of the first and second optical surfaces is substantially in a form of a circle whose center is on the optical axis is cut off by each of the first and second straight line portions.

REFERENCES:
patent: 4836960 (1989-06-01), Spector et al.
patent: 5329406 (1994-07-01), Nakanishi et al.
patent: 11-52108 (1999-02-01), None
patent: 2002-243915 (2002-08-01), None
Translation of JP11-52108.

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