Optical lens having a hygroscopicity adjusting part

Details Optical lens having a hygroscopicity adjusting part Optical lens having a hygroscopicity adjusting part

1998-09-29

1999-05-18

Epps, Georgia

Optical: systems and elements

Lens

With support

G02B7/02

Patent

active

059055995

ABSTRACT:
An optical lens made of plastic comprises an optically functioning part, a flange part disposed around the optically functioning part, and a gate-removed part located at an outer circumferential face of the flange part. The gate-removed part is defined by removing a residual gate part projecting from the outer circumferential face. The surface of the gate-removed part is covered with a hygroscopicity adjusting part. The hygroscopicity adjusting part is made of a material less hygroscopic than the plastic of which the optical lens is made.

REFERENCES:
patent: 5576896 (1996-11-01), Kitaoka et al.

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