Recording medium and method of manufacturing same

• US 6,420,007 B2
• Filed: 12/14/2000
• Issued: 07/16/2002
• Est. Priority Date: 12/14/1999
• Status: Expired due to Fees

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Usami, Yoshihisa
• Primary Examiner(s): MULVANEY, ELIZABETH EVANS
• Application Number:
  US09/735,610
• Publication Number:
  US 20010005537A1
• Time in Patent Office: 579 Days
• Field of Search: 428/64.1, 428/64.4, 428/64.8, 428/457, 428/913, 430/270.11, 430/495.1, 430/745, 204/192.1, 204/192.12
• US Class Current: 428/64.1
• CPC Class Codes: C23C 14/35 by application of a magnetic field, e.g. magnetron sputtering C23C14/3457 takes precedence
• CPC Class Codes: G11B 7/246 containing dyes
• CPC Class Codes: G11B 7/258 of reflective layers
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers
• CPC Class Codes: H01J 37/3408 Planar magnetron sputtering
• CPC Class Codes: H01J 37/3452 Magnet distribution
• CPC Class Codes: H01J 37/3458 Electromagnets in particular for cathodic sputtering apparatus electromagnets in general H01F7/06
• CPC Class Codes: Y10T 428/21 Circular sheet or circular blank

Abstract

A recording medium is fabricated by forming a light reflecting layer on a dye recording layer capable of recording information, with a sputtering mechanism. The sputtering mechanism has a target, an electromagnet in the shape of a solenoid disposed in horizontally facing relationship to the target, and a coaxial cylindrical permanent magnet disposed in vertically facing relationship to the target. The permanent magnet has an outer circumferential region serving as an N pole and an inner circumferential region serving as an S pole. The electromagnet is electrically connected to a DC power supply via a controller which controls the intensity of a current flowing through the electromagnet.

Claims

1. A recording medium comprising:

a substrate;

a recording layer disposed on said substrate for recording information; and

a light reflecting layer disposed on said substrate;

said light reflecting layer being formed on said recording layer by a sputtering mechanism having a permanent magnet, an electromagnet, and a target while the intensity and distribution of a magnetic field generated by said permanent magnet and said electromagnet is being controlled by a controller.

2. A method of manufacturing a recording medium having a substrate, a recording layer disposed on said substrate for recording information, and a light reflecting layer disposed on said substrate, comprising the step of:

forming said light reflecting layer on said recording layer with a sputtering mechanism having a permanent magnet, an electromagnet, and a target while the intensity and distribution of a magnetic field generated by said permanent magnet and said electromagnet is being controlled by a controller.

5. A method according to claim 2, wherein a direct current flows through said electromagnet.

7. A method according to claim 2, wherein said permanent magnet is of a coaxial cylindrical shape.

9. A method according to claim 2, wherein said permanent magnet is of a bar shape.

11. A method according to claim 9, wherein said permanent magnet comprises an annular array of permanent magnets.

3. A method of manufacturing a recording medium having a substrate, a recording layer disposed on said substrate for recording information, and a light reflecting layer disposed on said substrate, comprising the step of:

forming said light reflecting layer on said recording layer with a sputtering mechanism having a permanent magnet and a target while the distribution of a magnetic field generated by said permanent magnet is being changed by displacing said permanent magnet parallel to said substrate.

8. A method according to claim 3, wherein said permanent magnet is of a coaxial cylindrical shape.

10. A method according to claim 3, wherein said permanent magnet is of a bar shape.

12. A method according to claim 10, wherein said permanent magnet comprises an annular array of permanent magnets.

4. A method of manufacturing a recording medium having a substrate, a recording layer disposed on said substrate for recording information, and a light reflecting layer disposed on said substrate, comprising the step of:

forming said light reflecting layer on said recording layer with a sputtering mechanism having an electromagnet and a target while the intensity and distribution of a magnetic field generated by said electromagnet is being controlled by a controller.

6. A method according to claim 4, wherein a direct current flows through said electromagnet.