Title:
光磁気記録媒体および光磁気記録媒体の製造方法並びに光磁気記録媒体駆動装置
Document Type and Number:
Japanese Patent JP4235182
Kind Code:
B2
Abstract:
A magneto-optical disc (11) has a substrate (12). On the surface of the substrate (12), a phase pit (13) is formed. According to the phase pit (13), RAM information is recorded. The phase pit (13) is covered by an undercoat film (14), a recording magnetic film (15), an overcoat film (17), and a reflection film (18). On the phase pit (13), the RAM information is recorded onto a recording magnetic film (15). On the substrate (12), a difference between a first birefringence value of the single path measured with inclination of 20 degrees around the radius passing through the measurement optical beam radiation position with respect to the reference plane orthogonal to the measurement optical beam and a second birefringence value of the single path measured with inclination of 20 degrees around the tangent line of the tracking direction passing through the measurement optical beam radiation position with respect to the reference plane is set to 37 nm or below. Jitter is reduced when reading out the ROM information and the RAM information.
Inventors:
Tetsuo Hosokawa
Tomoyuki Aida
Hidekazu Haga
Tomoyuki Aida
Hidekazu Haga
Application Number:
JP2004572120A
Publication Date:
March 11, 2009
Filing Date:
May 23, 2003
Export Citation:
Assignee:
富士通株式会社
International Classes:
G11B11/105; G11B7/007; G11B7/013
Domestic Patent References:
| JP1159846A | ||||
| JP2101655A | ||||
| JP63220439A | ||||
| JP2001344842A | ||||
| JP10334530A | ||||
| JP2003022591A | ||||
| JP2003026913A |
Attorney, Agent or Firm:
山▲崎▼ 薫