# US 5,699,848 A · Method for manufacturing a replica stamper

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,699,848 A
- Document ID: US5699848A
- Status: Granted
- Kind: A
- Application number: 08/560,695
- Filed: 1995-11-20
- Granted: 1997-12-23
- Earliest claimed: 1994-12-03
- Assignees: Skc Co., Ltd.
- Inventors: Chang-Yong Lee; Joo-Hwan Kim; Soo-Sun Ryu
- Web page: https://patentgrep.com/patent/US5699848A

## 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: 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 method for forming a replica stamper for use in mass producing an optical disk, wherein the optical disk has a plurality of tracks arranged spirally or concentrically, and each of the tracks includes a recess and a protrusion for recording information signals thereon, comprises the steps of: (a) preparing a master stamper having a top surface and a flat bottom surface, wherein the top surface of the master stamper includes a plurality of tracks corresponding to the plurality of tracks of the optical disk; (b) depositing a buffer layer on the top surface of the master stamper; (c) forming a replica stamper on top of the buffer layer; (d) disengaging the master stamper from the buffer layer and the replica stamper; and (e) removing the buffer layer from the replica stamper.

## Claims

### Claim 1

A method for manufacturing a replica stamper for use in the mass production of an optical disk, wherein the optical disk has a plurality of tracks arranged spirally or concentrically, and each of the tracks has a recess and a protrusion for the recordation of information signals thereon, the method comprising the steps of:
(a) preparing a master stamper made of polycarbonate having a top surface and a flat bottom surface, wherein the top surface of the master stamper includes a plurality of tracks, the plurality of tracks on the master stamper corresponding to the plurality of tracks on the optical disk, each of the tracks being provided with a recess and a protrusion;
(b) depositing a buffer layer on the entirety of the top surface of the master stamper;
(c) forming a replica stamper on top of the buffer layer;
(d) disengaging the master stamper from the buffer layer and the replica stamper; and
(e) removing the buffer layer from top of the replica stamper.

### Claim 2 (depends on 1)

The method of claim 1, wherein said step (a) of preparing the master stamper includes the steps of:
(a1) preparing a substrate having a flat top and a flat bottom surfaces;
(a2) forming a first separation layer on the top surface of the substrate;
(a3) patterning the first separation layer into a predetermined configuration, wherein the predetermined configuration includes the plurality of tracks of the master stamper corresponding to the plurality of tracks on the optical disk;
(a4) depositing a second separation layer having a uniform thickness on top of the patterned separation layer;
(a5) providing a metallic layer on top of the second separation layer;
(a6) separating the patterned separation layer and the substrate from the second separation layer and the metallic layer; and
(a7) dissolving the second separation layer from the metallic layer to thereby form the master stamper.

### Claim 3 (depends on 1)

The method of claim 1, wherein the buffer layer is made of silver.

### Claim 4 (depends on 1)

The method of claim 1, wherein the buffer layer is made of gold.

### Claim 5 (depends on 1)

The method of claim 1, wherein the buffer layer is formed by using a sputtering method.

### Claim 6 (depends on 1)

The method of claim 1, wherein the replica stamper is formed by using a non-electrolytic plating method.

### Claim 7 (depends on 1)

The method of claim 1, wherein the replica stamper is disengaged from the buffer layer and the replica stamper by employing a solution.

### Claim 8 (depends on 7)

The method of claim 7, wherein the solution is prepared by dissolving hydrogen peroxide into ammonia water.