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Air Platens for Input and Output Contact Copy

IP.com Disclosure Number: IPCOM000092445D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Kurotsuchi, HH: AUTHOR [+4]

Abstract

In contact printing, it is essential that the two members be in intimate contact during exposure, thus dictating that there be no air entrapped between the two.

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Air Platens for Input and Output Contact Copy

In contact printing, it is essential that the two members be in intimate contact during exposure, thus dictating that there be no air entrapped between the two.

Two devices are shown to accomplish this. In the upper drawing, a fixed platen for backing the chip includes a shallow cavity with a transparent back and a vent slot from the cavity through one edge of the cavity frame. A chamfer is provided at the inner perimeter of the cavity frame but away from the transparent back to allow the chip to form a natural curvature under pressure.

In the lower drawing, the movable platen is provided with narrow projecting land around the pressurized cavity which is backed by a rigid transparent, glass, material. The projecting land provides high pressure per unit area where it contacts the film of the aperture card, thus providing a relatively tight seal to the film borders. The fixed platen does not include a cavity. Instead, it utilizes a flat glass plate provided with a vent outlet.

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