Duplex lens

Details Duplex lens Duplex lens

1987-04-06

1990-07-10

Thurlow, Jeffery

Static molds

Mold including core and means to remove core

249158, 249161, 264 18, 425808, B29D 1100, B29C 3912

Patent

active

049402056

ABSTRACT:
A method and apparatus for forming a laminated bifocal lens which includes forming a frontal lens component having a bifocal element in a substantially stress-free manner and bonding the frontal lens component to a rear lens component which is also formed in a substantially stress-free manner. The laminated lens so provided may be inexpensively formed, is lightweight, and has optimum optical and physical characteristics.

REFERENCES:
patent: 2026606 (1936-01-01), Bausch
patent: 3273204 (1966-09-01), Craddock
patent: 3507076 (1970-04-01), Rudd et al.
patent: 4184835 (1980-01-01), Talbot
patent: 4279401 (1981-07-01), Ramirez et al.
patent: 4452420 (1984-06-01), Lundquist
patent: 4664854 (1987-05-01), Bakalar

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