Read-only optical disc medium and method of fabricating the same
AssigneeSony Disc & Digital Solutions Inc.
InventorTakayuki Asahina
Life of this patent
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Abstract
A read-only optical disc medium is disclosed. The disc medium includes: an information recording area in which information is recorded by means of an embossed pit array formed in a convexo-concave shape having a reflective layer deposited thereon; a test writing area which is used for test write recording of a mark formed by dissipating or decreasing the reflective layer; and an additional write area in which a record data string is formed of a mark by dissipating or decreasing the reflective layer under a recording condition decided in accordance with a result of test write recording performed in the test writing area.
Claims10
A read-only optical disc medium comprising:
- an information recording area in which information is recorded by means of an embossed pit array formed in a convexo-concave shape having a reflective layer deposited thereon;
- a test writing area which is used for test write recording of a mark formed by dissipating or decreasing the reflective layer;
- and
- an additional write area in which a record data string is formed of a mark by dissipating or decreasing the reflective layer under a recording condition decided in accordance with a result of test write recording performed in the test writing area.
A method of fabricating a read-only optical disc medium comprising the steps of:
- forming an optical disc master having a convexo-concave shape thereon based on an information signal and having a flat area to be a test writing area and an additional write area;
- shaping a disc substrate having the convexo-concave shape and the flat area on an information recording surface thereof by using a stamper prepared from the optical disc master;
- depositing a reflective layer on the information recording surface to form an embossed pit array in the convexo-concave shape having the reflective layer deposited thereon and the test writing area and the additional write area as the flat area having the reflective layer deposited thereon;
- and
- performing test write of a mark formed by dissipating or decreasing the reflective layer in the test writing area, forming a mark by dissipating or decreasing the reflective layer in the additional write area under a recording condition decided in accordance with a result of the test write recording, and forming a record data string formed of the mark.
Dependencies are inferred from the claim text.