Geometrical instruments – Straight-line light ray type – Reticle
Patent
1975-07-24
1976-12-28
Hoffman, James R.
Geometrical instruments
Straight-line light ray type
Reticle
350164, 428209, G02B 110
Patent
active
039993019
ABSTRACT:
A method of producing an optical reticle and the reticle produced thereby. thin layer of aluminum is deposited on the face of a sapphire substrate and a reticle pattern is chemically etched therein. The system is then exposed to air at an elevated temperature for approximately one hour to oxidize the remaining aluminum layer. A film of titanium is next placed over the rough aluminum oxide as by sputtering, for example, and the excess titanium is etched away by the same pattern to produce the finished reticle.
REFERENCES:
patent: 2715352 (1955-08-01), Jobe
patent: 2999034 (1961-09-01), Heidenhain
patent: 3622319 (1971-11-01), Sharp
Hunt Robert E.
Moore Kenneth L.
Hennen Thomas W.
Hoffman James R.
Miller Roy
Sciascia R. S.
The United States of America as represented by the Secretary of
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