Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-02-19
1992-06-09
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
2191217, 271 69, 271 94, 205 75, H01R 4300
Patent
active
051195500
ABSTRACT:
A transfer apparatus includes a transfer member, for example, a transfer drum with a line of small closely spaced laser drilled vacuum holes to hold a receiving sheet to the drum surface. The transfer drum is formed by forming a layer of at least intermediate conductivity material on the surface of a core, forming at least one vacuum opening in the core and laser drilling in the layer a line of closely spaced small holes communicating with the opening. In one embodiment, a short focal length lens focuses a laser beam near the surface of the layer, which beam spreads below the surface to form a conical hole. The conical hole helps maintain the continuity of a transfer field while being free from clogging.
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Research Disclosure, Dec. 1980, No. 200, p. 525 R. D. May and P. B. Wood.
Baughman Richard C.
Ellingham David J.
Fowlkes William Y.
Rubin Bruce J.
Stepanik Frank S.
Arbes Carl J.
Eastman Kodak Company
Treash, Jr. Leonard W.
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