Plastic lens and method of making the same

Details Plastic lens and method of making the same Plastic lens and method of making the same

1998-03-03

1999-11-09

Epps, Georgia

Optical: systems and elements

Lens

With support

359642, 359811, 359818, 264 12, 264 22, 264 23, 264 24, G02B 300, G02B 702

Patent

active

059825650

ABSTRACT:
A plastic lens includes an optically functioning section, a flange section disposed at an outer periphery thereof, a reference surface formed at an outer peripheral portion of the flange section and adapted to become a reference for attachment, and a tapered surface formed on at least a part of the outer peripheral portion of the flange section which is located closer to the optically functioning section side than is the reference surface so as to taper down its diameter along the optical axis of the optically functioning section. The tapered surface forms a surface at which a gate for resin injection is located upon manufacture.

REFERENCES:
patent: 4861137 (1989-08-01), Nagata
patent: 5905599 (1999-05-01), Nomura et al.
"Injection Molding for Thermoplastics", S.E. Tinkham, W.I. Pribble, and E.L. Buckleitner, in Bubois & Pribble's Plastics Mold Engineering Handbook (5th edition), chapter 8, pp. 407-408 (E.L Buckleitner, editor), 1995.

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