Producing a replicate video disc by a method of photographic con

Details Producing a replicate video disc by a method of photographic con Producing a replicate video disc by a method of photographic con

1979-08-29

1990-12-25

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

346 11, 346 76L, 3461351, 358310, 358345, 358347, 365106, 365120, 365127, 365146, 369100, 369109, 369111, 369112, 369125, 3692751, 369277, 369284, 369285, 430 1, 430 5, 430 8, 430 11, 430 17, 430 23, 430146, 430148, 430269, 430321, 430332, 430334, 430367, 430390, 430393, 430395, 430396, 430495, 430945, 355 79, 355132, G03C 534, G03C 518, G03C 500, G01D 900

Patent

active

049802623

ABSTRACT:
A photographic contact printing process is disclosed having application in the mass production of replicate video discs from a master disc, and other applications wherein it is desired to replicate micro-detail over a relatively large area. A problem with conventional contact printing from a mask to a photographic medium is one of maintaining intimate contact over a relatively large area since dust, dirt, etc., are almost impossible to completely eliminate in any practical manner. In accordance with the present invention, a contact printing process is provided wherein intimate contact is not necessary for making high quality contact prints. The present invention recognizes that in contact printing information from a master disc to a replicate disc, the contact printing process is significantly less sensitive to imperfect contact between the master disc and the replicate disc if one employs a replicate disc comprising a photosensitive material having a certain optical properties. In particular, the photosensitive material initially has a high level of absorption to the actinic radiation used for exposure but, under the influence of such actinic radiation, the absorption decays to a lower level during exposure.

REFERENCES:
patent: 3665483 (1972-05-01), Beckov et al.
patent: 3838401 (1974-09-01), Graf et al.
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4032691 (1977-06-01), Kido et al.
patent: 4152156 (1979-05-01), Voisin et al.
Bouwhuis et al., "Principles of Optical Disc Systems", Adam Hilger Ltd., 1985, pp. 1-4 relied on.
Berg, A., et al., J. of SMPTE, vol. 83, No. 7, pp. 588-599, 7/1974.
Bartolini, R. A., et al., Optical Enginerring, vol. 15, No. 2, pp. 99-108, 3-4/1976.

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