Master for device replication

Details Master for device replication Master for device replication

1981-09-08

1983-05-03

Hoffman, James R.

Coating processes

Latent image formed or developed

264 25, 427162, 427164, B05D 506, B29C 300, B29C 500

Patent

active

043821030

ABSTRACT:
A layer of an ion exchanged glass is utilized as the master for video disc production. Due to the ion exchange, such glass possesses stored energy in the form of compressive stress. When localized portions of the layer of ion exchanged glass are heated sufficiently, those portions of the glass soften and release the compressive stress energy in the form of localized surface bumps. The presence or absence of surface bumps and/or their height can convey the video information in analog or binary form. Once the ion exchanged master is formed, the master is used in a conventional manner to produce mirror image copies on a suitable, conventional substrate, generally a plastic. The copies are generally formed by a pressing or stamping technique, or by an injection molding technique. The relief surface of the copies can be coated with a conventional light reflective layer to aid in optical read-out of the video information stored by the relief surface.

REFERENCES:
Laser Focus, p. 10, Jun. 1981.

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