Reverse optical mastering for data storage disks

US 20010000746A1
Filed: 12/05/2000
Published: 05/03/2001
Est. Priority Date: 04/06/1998
Status: Active Grant

First Claim

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1. A method of making a data storage disk master comprising:

providing a master substrate;

specifying a photosensitive material layer thickness;

providing a layer of photosensitive material on the master substrate, the layer having an initial thickness corresponding to the specified photosensitive material layer thickness;

controlling optical exposure to the layer of photosensitive material; and

controlling development criteria of the layer of photosensitive material, wherein specifying a photosensitive material layer thickness, controlling optical exposure and controlling development criteria collectively control the creation of an inverse of a desired replica disk pattern on the master.

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Abstract

A data storage master disk and method of making a data storage master disk. The data storage disk master is for use in a data storage disk replication process. The data storage disk molding processes produces replica disks having a surface relief pattern with replica lands and replica grooves. The method includes providing a master substrate. The master substrate is at least partially covered with a layer of photosensitive material. A surface relief pattern having master lands and master grooves is recorded in the data storage disk master, including the steps of exposing and developing the photosensitive material. The exposing and developing of a specified thickness of photosensitive material is controlled to form master grooves extending down to a substrate interface between the master substrate and the layer of photosensitive material, such that the width of the master grooves at the substrate interface corresponds to a desired width of the replica lands.

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26 Claims

1. A method of making a data storage disk master comprising:
- providing a master substrate;
  
  specifying a photosensitive material layer thickness;
  
  providing a layer of photosensitive material on the master substrate, the layer having an initial thickness corresponding to the specified photosensitive material layer thickness;
  
  controlling optical exposure to the layer of photosensitive material; and
  
  controlling development criteria of the layer of photosensitive material, wherein specifying a photosensitive material layer thickness, controlling optical exposure and controlling development criteria collectively control the creation of an inverse of a desired replica disk pattern on the master.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- - 2. The method of claim 1, wherein the inverse of the desired replica disk pattern includes an inverse of desired lands and grooves.
  - 3. The method of claim 2, wherein at least some of the inverse of desired lands and grooves have a depth greater than 50 nanometers.
  - 4. The method of claim 2, wherein at least some of the inverse of desired lands and grooves have a width greater than 150 nanometers.
  - 5. The method of claim 1, wherein the inverse of the desired replica disk pattern includes an inverse of desired surface variations.
  - 6. The method of claim 5, wherein at least some of the inverse of desired surface variations have a depth of less than 50 nanometers.
  - 7. The method of claim 5, wherein at least some of the inverse of desired surface variations have a width less than 150 nanometers.
  - 8. The method of claim 1, further comprising creating a first-generation stamper from the master.
  - 9. The method of claim 8, further comprising creating a second-generation stamper from the first-generation stamper.
  - 10. The method of claim 9, further comprising creating flyable media exhibiting surface variations using the second-generation stamper.

11. A method of making a data storage disk master comprising:
- providing a master substrate;
  
  specifying a thickness of photosensitive material;
  
  coating the master substrate with the specified thickness of photosensitive material;
  
  exposing the photosensitive material to a controlled amount of optical energy; and
  
  exposing the photosensitive material to developer solution, wherein the specified thickness of photosensitive material, the controlled amount of optical energy, and the exposure to developer solution collectively define an inverse pattern of specified lands and grooves on the master.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
- - 12. The method of claim 11, wherein the inverse pattern has a substantially flat groove bottom.
  - 13. The method of claim 12, wherein the substantially flat groove bottom is defined by a surface of the master substrate.
  - 14. The method of claim 11, wherein at least some of the inverse pattern of specified lands and grooves has a depth greater than 50 nanometers.
  - 15. The method of claim 11, wherein at least some of the inverse pattern of specified lands and grooves has a width greater than 150 nanometers.
  - 16. The method of claim 11, further comprising creating a first-generation stamper from the master.
  - 17. The method of claim 16, further comprising creating a second-generation stamper from the first-generation stamper.
  - 18. The method of claim 17, further comprising creating flyable media using the second-generation stamper.

19. A method of making a data storage disk master comprising:
- providing a master substrate;
  
  specifying a thickness of photosensitive material;
  
  coating the master substrate with the specified thickness of photosensitive material;
  
  exposing the photosensitive material to a controlled amount of optical energy; and
  
  exposing the photosensitive material to developer solution, wherein the specified amount of photosensitive material, the controlled amount of optical energy, and exposure to the developer solution collectively define a pattern having an inverse of desired surface variations.
- View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
- - 20. The method of claim 19, wherein the pattern having an inverse of desired surface variations has a flat master bottom defined by a surface of the substrate.
  - 21. The method of claim 19, further comprising creating a first-generation stamper from the master.
  - 22. The method of claim 21, further comprising creating a second-generation stamper from the first-generation stamper.
  - 23. The method of claim 22, further comprising creating flyable media that exhibit surface variations using the second-generation stamper.
  - 24. The method of claim 19, wherein at least part of the pattern having an inverse of desired surface variations has a depth less than 50 nanometers.
  - 25. The method of claim 20, wherein at least part of the pattern having an inverse of desired surface variations has a depth less than 25 nanometers.
  - 26. The method of claim 20, wherein at least part of the pattern having an inverse of desired surface variations has a width less than 150 nanometers.

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Current Assignee
Max Blu Technologies, LLC (IP Investments Group LLC)
Original Assignee
Imation Corporation (Glassbridge Enterprises, Inc.)
Inventors
Edwards, Jathan D.

Granted Patent

US 6,890,704 B2
Time in Patent Office

Days
Field of Search
US Class Current

430/321
CPC Class Codes

G11B 23/0085   intermediate mediums using ...

G11B 7/24   Record carriers characteris...

G11B 7/24091   Combinations of pits and tr...

G11B 7/261   Preparing a master, e.g. ex...

G11B 7/263   Preparing and using a stamp...

Y10S 425/81   Sound record

Reverse optical mastering for data storage disks

First Claim

7 Assignments

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Abstract

21 Citations

26 Claims

Specification

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Reverse optical mastering for data storage disks

First Claim

7 Assignments

Subscription Required

Subscription Required

0 Petitions

Subscription Required

Accused Products

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Abstract

21 Citations

26 Claims

Specification

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Solutions

Use Cases

Quick Links