Reducing stray light in lensed optical systems

Details Reducing stray light in lensed optical systems Reducing stray light in lensed optical systems

1990-09-04

1992-01-07

Lindsay, Robert L.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 322, 313534, C03B 3200, C03C 1500

Patent

active

050787730

ABSTRACT:
An optical lens has a blackened layer in its outer surface which extends to a depth sufficient to substantially eliminate reflected stray light in the lens. The blackened layer is formed by causing hydrogen under pressure to react for a predetermined time and temperature with a metal oxide of the optical material thereby leaving the metal oxide in its reduced form in the lens. Some of the oxides are reduced completely, leaving the metal in its elemental form in the layer.

REFERENCES:
patent: Re33183 (1990-03-01), Holland et al.
patent: 4118214 (1978-10-01), Wedding
patent: 4475059 (1984-10-01), Sink
patent: 4760307 (1988-07-01), Howorth

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