# US 8,147,729 B2 · Techniques for forming burst cutting area mark

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- Number: US 8,147,729 B2
- Document ID: US8147729B2
- Status: Granted
- Kind: B2
- Application number: 12/567,886
- Filed: 2009-09-28
- Published: 2010-01-21
- Granted: 2012-04-03
- Earliest claimed: 2005-06-03
- Assignees: Cinram International Inc.
- Inventors: James J. Musto; James Myrtle
- Web page: https://patentgrep.com/patent/US8147729B2

## CPC

- G11B 7/263: {Preparing and using a stamper, e.g. pressing or injection molding substrates (production of optical record carriers, e.g. optical discs B29D17/005)}
- G11B 7/261: {Preparing a master, e.g. exposing photoresist, electroforming}
- G11B 7/00736: {Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information (sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082)}
- G11B 20/00115: {wherein the record carrier stores a unique medium identifier}
- G11B 20/00768: {wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags}
- G11B 20/1217: {on discs}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A BCA mark is applied prior to molding of optical recording media. A stamper including a BCA code is formed. The stamper including the BCA code is used in the molding of optical recording discs. This technique can be used in manufacturing of read-only type discs, recordable discs, rewritable discs, hybrid discs, discs readable from both disc sides, discs having multiple information layers, high-density discs, etc.

## Claims

### Claim 1

A method for applying data to a burst cutting area (BCA) prior to molding of optical recording media, said method comprising:
forming a stamper including BCA data thereon; and
using the stamper including the BCA data in the molding of optical recording discs to form optical recording discs including a BCA mark thereon,
wherein the BCA data is applied by a laser to one of a father or a mother,
where the stamper is formed using the mother, and the mother is formed using the father and the father is formed using a mastering substrate.

### Claim 2 (depends on 1)

The method of claim 1, wherein the BCA data is applied to the father, and the father including the BCA data is used in a process for forming the stamper.

### Claim 3 (depends on 1)

The method of claim 1, wherein the BCA data is applied to the mother, and the mother including the BCA data is used in a process for forming the stamper.

### Claim 4 (depends on 1)

The method of claim 1, further comprising the step of covering an information layer and the BCA mark of the optical recording discs with a reflective layer.

### Claim 5 (depends on 1)

The method of claim 1, wherein the BCA mark applied to the stamper has physical parameters that accommodate contrast and shrinkage in the molded optical recording discs.

### Claim 6 (depends on 1)

The method of claim 1, wherein the BCA data is applied by the laser in a non-continuous spiral mode that is timed with a pulse per revolution signal according to the BCA data.