Optical disc air separation method and device
AssigneeOptical Disc Corporation
InventorJohn S. Winslow
Life of this patent
Estimating the term…
Abstract
An optical disc structure including two resilient disc members which are bonded together adjacent their outer peripheries and which include an air channel allowing communication between the chamber formed between the discs and the atmosphere. An information layer is formed on the inner surface of at least one of the members. When the members are spun, a pressure differential is caused tending to push the two members apart, thereby assuring that one member will not contact the information layer formed on the other member and that the two members will not be close enough together to cause optical interference.
Claims18
An optical information medium, comprising:
- first and second resilient disc-shaped members,
- said members being substantially rigidly bonded together adjacent their outer peripheries and substantially hermetically sealed adjacent their outer peripheries,
- said member defining at least one air channel adjacent the center thereof,
- said at least one air channel providing communication between the atmosphere and an unbonded region between said members, said air channel being sufficiently large to allow substantially instantaneous expansion of the spacing between said members over said unbonded area upon spinning of said medium about its central axis,
- at least one of said members being at least partially transparent to light.
A method of forming an optical information storage member, comprising the steps of:
- forming two disc-shaped members;
- coating an inner surface of at least one of said members with an information layer;
- and
- bonding the two members together such that:
- the outer peripheries of the two members are mechanically constrained to remain parallel;
- the two members are unbonded over an annular information region;
- and
- an air channel is present adjacent the center of the members which allows communication between the atmosphere and the information region;
- and
- rotating the bonded members about their central axes, such that the members are pulled slightly apart over the information region.
Dependencies are inferred from the claim text.