Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1987-02-24
1988-08-30
Powell, William A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
156626, 156652, 156653, 156656, 156657, 1566591, 156667, 252 792, 356237, 356243, 428432, 430313, 430318, G01J 102, B32B 300, B44C 122, C23F 102
Patent
active
047676604
ABSTRACT:
In a calibration member for use in calibrating an optical scanner, a first shading layer which is resistant against a predetermined etchant is deposited on a first principal surface of a substrate and covered with a second shading layer soluable by the predetermined etchant. The second shading layer alone is selectively etched by the predetermined etchant to leave a predetermined pattern on the first shading layer. An antireflection layer may be interposed between the first shading layer and the predetermined pattern. Alternatively, the predetermined pattern may be covered with an antireflection pattern etched together with the second shading layer. Similar structure may be formed on a second principal surface of the substrate.
REFERENCES:
patent: 4350729 (1982-09-01), Nakano et al.
patent: 4440841 (1984-04-01), Tabuchi
patent: 4512659 (1985-04-01), Galbraith et al.
patent: 4530891 (1985-07-01), Nagarekawa et al.
patent: 4650744 (1987-03-01), Amano
Hosoda Keiji
Ozeki Masaaki
Hoya Corporation
Powell William A.
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