Method and device for instantly encoding digitized information on a stamper from which compact discs can be made

• US 6,272,101 B1
• Filed: 12/15/1998
• Issued: 08/07/2001
• Est. Priority Date: 12/15/1998
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Morton, Edward W.
• Primary Examiner(s): EDUN, MUHAMMAD N
• Application Number:
  US09/210,839
• Time in Patent Office: 966 Days
• Field of Search: 369/59, 369/47, 369/48, 369/49, 369/54, 369/58, 369/44.12, 369/44.14, 369/44.23, 369/44.25, 369/44.27, 369/44.28, 369/44.37, 369/112, 369/112.01, 369/112.23, 369/112.24, 369/112.26, 369/116, 369/121
• US Class Current: 369/121
• CPC Class Codes: G11B 7/12 Heads, e.g. forming of the optical beam spot or modulation of the optical beam disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method G11B7/08 ; modulating lasers H01S3/10; controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching gating or modulating G02F1/00
• CPC Class Codes: G11B 7/127 Lasers; Multiple laser arrays lasers per se H01S
• CPC Class Codes: G11B 7/1372 Lenses
• CPC Class Codes: G11B 7/261 Preparing a master, e.g. exposing photoresist, electroforming

Abstract

An apparatus and method for mass producing optically readable discs includes providing an array of light emitting devices which are arranged in a spiral pattern corresponding to the spiral track along which data is recorded on optically readable discs. The light emitting devices of the array are driven selectively to expose a layer of photoresist on a substrate. The light is focused on the substrate by an array of micro-lenses corresponding to the array of light emitting devices. When the photoresist on the substrate is developed, it can either by cured for use as a stamper or metallized for use in forming, in succession, a father, a mother and a stamper.

Claims

1. An apparatus for producing optically-readable discs, comprising:

an array of light emitting devices, spirally arranged corresponding a spiral track, along which data is recorded, on a disc; and

a processor for receiving a digital signal to be recorded on said disc and for selectively driving said light emitting devices in accordance with said digital signal.

2. The apparatus of claim 1, further comprising an array of spirally-arranged micro-lenses corresponding to said array of light emitting devices for focusing light from said light emitting devices on a substrate.

3. The apparatus of claim 1, wherein said light emitting devices are light emitting diodes.

4. The apparatus of claim 1, wherein said light emitting devices emit light with a wavelength of approximately 455 nm.

5. The apparatus of claim 2, further comprising said substrate, said substrate having a layer of photoresist deposited thereon which is exposed to light from said array of light emitting devices which has been focused by said array of micro-lenses.

6. A method of recording information on an optically readable disc comprising exposing a substrate having a layer of photoresist thereon with an array of spirally-arranged light emitting devices corresponding to a spiral track along which data is recorded on an optically readable disc, wherein said light emitting devices of said array are driven according to a digital data signal to be recorded on said optically readable disc.

7. The method of claim 6, further comprising developing said photoresist layer.

8. The method of claim 7, further comprising curing and hardening said developed photoresist layer to form a stamper.

9. The method of claim 8, further comprising producing an optically readable disc by injecting material for forming such a disc into a mold comprising said stamper.

10. The method of claim 7, further comprising using said substrate and developed photoresist layer to form, in succession, a father, a mother and a stamper.

11. The method of claim 6, further comprising driving said array of light emitting devices with a processor which receives said digital data signal.

12. The method of claim 6, further comprising focusing light from said array of light emitting devices on said substrate with an array of spirally-arranged micro lenses.

13. An apparatus for producing optically readable discs, comprising:

light emitting means spirally arranged to selectively emit light along a spiral track corresponding a spiral track along which data is recorded on a disc; and

means for receiving a digital signal to be recorded on said disc and for selectively driving said light emitting means in accordance with said digital signal.

14. The apparatus of claim 13, further comprising a focusing means corresponding to said light emitting means for focusing light from said light emitting means on a substrate.

15. The apparatus of claim 13, wherein said light emitting means comprise an array of light emitting diodes.

16. The apparatus of claim 13, wherein said light emitting means emit light with a wavelength of approximately 455 nm.

17. The apparatus of claim 14, further comprising said substrate, said substrate having a layer of photoresist deposited thereon which is exposed to light from said light emitting means which has been focused by said focusing means.