Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1988-11-16
1990-03-20
Lindsay, Robert L.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 61, 21912168, 156657, 351160R, 351161, C03B 1900
Patent
active
049098187
ABSTRACT:
A diffractive bifocal eye lens, an otpical system, and processes for fabrication of such lenses are disclosed. The optical system includes the following principal elements in optical alignment along an optical axis, for accomplishing the indicated steps of the process: a laser for emission of ultraviolet light along the optical axis; a zone plate mask in the path of irradiation by the laser; and an imaging lens to project, with radiation from the laser, an image of the mask on the concave inner surface of an eye lens mounted coincident with the image surface of the optical system, thereby ablating the eye lens imagewise of the mask to generate a phase zone plate on the eye lens. The laser beam scans the zone plate mask to generate a composite image on the image surface. Alternatively, the phase zone plate is generated on the concave surface of a glass blank at the image surface to form a tool from which molds, and in turn lenses, are replicated. The light source is an argon fluoride excimer laser, emitting at 193 nm. The lens is a variable magnification lens to project various size images of the mask for producing zone plates of various powers as desired.
REFERENCES:
patent: 4476154 (1984-10-01), Iesaka et al.
patent: 4563565 (1986-01-01), Kampfer et al.
patent: 4675072 (1987-06-01), Bennett et al.
patent: 4704016 (1987-11-01), de Carle
patent: 4797316 (1989-01-01), Hecq et al.
PCT/US88/01651, May 17, 1988 filed, published 12/88, Portney et al.
Lindsay Robert L.
Norton John S.
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