Patent
Method and apparatus for making a stamping master for video disc replication
TLDR
In this article, a method for making a stamping master for video disk replication is described, where a film (18) of material which is reversibly convertible between two stable states, one having a high electrical conductivity and the other having a low electrical conductivities, is deposited on a substrate (20) while in one of the states.Abstract:
There is disclosed a new and improved method for making a stamping master for video disk replication wherein a film (18) of material which is reversibly convertible between two stable states, one having a high electrical conductivity and the other having a low electrical conductivity, is deposited on a substrate (20) while in one of the states. The material (18) is then imaged with information in coded form by converting selected areas (52) of the film (18) to the other state in a predetermined pattern corresponding to the coded information. The conversion can be accomplished by light, electromagnetic energy or heat. At this stage, an intermediate subassembly (56), composed of the imaged film (18) on the substrate (20), is formed which can be read for accuracy by detecting the state of the selectively converted areas (52) with respect to the rest of the film (18). Corrections can be made by converting the state of selected areas (52) of the film (18) as required. A metal (58), such as nickel, is then electroplated onto the areas of the film (18) which are in the high conductivity state. The plating is continued until the nickel spans the areas (52) of the film on which it did not directly plate. In this way a continuous backing layer which is integral with the plated nickel is formed. The nickel is then separated from the imaged material to provide a first stamping master (60) which is used to form a second stamping master (62) of opposite polarity to the first, preferably by a similar plating onto the first master. The second stamping master (62) is used directly for video disk replication.read more
Citations
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References
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Printing and copying employing materials with surface variations
TL;DR: In this paper, a printing plate is coated with an amorphous semiconductor material capable of being switched between a generally disordered or disordered state and a crystalline or more ordered state in response to light.
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Reversible recording medium and information record
Alan E. Bell,Arie Yehuda +1 more
TL;DR: In this paper, the authors proposed a recording medium where the light absorptive layer is a granular material comprising domains of a light sensitive material embedded in a dielectric matrix, which can be reversibly switched from a first state to a second state having different optical properties by the absorption of light.
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