G - Physics – 11 – B
Patent
G - Physics
11
B
352/32, 352/10.5
G11B 5/86 (2006.01) G03C 1/76 (2006.01) G03C 5/18 (2006.01) G11B 7/00 (2006.01) G11B 7/26 (2006.01) G11B 7/28 (2006.01)
Patent
CA 1171959
PRODUCING A REPLICATE VIDEO DISC BY A METHOD OF PHOTOGRAPHIC CONTACT PRINTING Abstract of the Disclosure A photographic contact printing process is dis- closed 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 con- ventional 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 print- ing process is proposed 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 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. -1-
283079
Howe Dennis G.
Thomas Harold T.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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