Chemistry: electrical and wave energy – Processes and products – Coating – forming or etching by sputtering
Patent
1995-09-08
1997-10-14
Czaja, Donald E.
Chemistry: electrical and wave energy
Processes and products
Coating, forming or etching by sputtering
20419214, 20419226, 427448, 427466, 427468, 427469, 427472, 427474, 427526, C23C 1400, C23C 1432
Patent
active
056768044
ABSTRACT:
Particles of a lens coating material for forming a primary film are deposited from a direction toward which the surfaces of the lens prisms of a Fresnel lens face. Next, a light absorbing film is formed, conventionally, by sputtering, on both the lens surfaces on which the previously deposited primary film was formed and on the non-lens surfaces (on which no primary film was formed). This light absorbing film is intended to absorb types of undesirable or "invalid" light (e.g., "flaring light"). Subsequently, the films are removed from only the lens surfaces. Accordingly, a Fresnel lens having "invalid" light absorbing films only on the non-lens surfaces is more easily fabricated within a shorter time and at a reduced cost. Moreover, it is also possible to reduce the generation of "cone" and "rainbow" effects caused by "flaring light" when the Fresnel lens is used as a field lens of a projection-type image display device.
REFERENCES:
patent: 3542453 (1970-11-01), Kantor
patent: 4670095 (1987-06-01), Negishi
Fujii Akiyoshi
Hamada Hiroshi
Tanaka Naoyuki
Czaja Donald E.
Sharp Kabushiki Kaisha
Vincent Sean
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