JPS6470946A - Optical head - Google Patents
Optical headInfo
- Publication number
- JPS6470946A JPS6470946A JP22739987A JP22739987A JPS6470946A JP S6470946 A JPS6470946 A JP S6470946A JP 22739987 A JP22739987 A JP 22739987A JP 22739987 A JP22739987 A JP 22739987A JP S6470946 A JPS6470946 A JP S6470946A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- erasing
- executed
- objective lens
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
Abstract
PURPOSE:To attain a pseudo-overwriting by arranging a magnet so that the direction of a magnetic field right below can be mutually made into the reverse direction and using an objective lens for erasing and recording, in a pair of objective lenses. CONSTITUTION:Right below two objective lenses 40 and 41, magnetic fields H1 and H2 in the opposite direction are formed with magnets 42, 43 and 44. The objective lenses 40 and 41 are fitted to one optical head and a laser light is converged to the same track on a recording medium 20. For example, by the converging of the objective lens 41, the recording layer of the recording medium 20 is heated to the extent of a curie point, the magnetization of the recording layer is arranged in the lower direction and erasing is executed. Continuously, the laser light modulated by an information signal is converged from the objective lens 40 to the recording medium 20, and thus, the magnetization of the recording layer is inverted in the upper direction in accordance with the signal and a signal is recorded. Thus, erasing and recording are continuously executed and the pseudo-overwriting can be executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22739987A JPS6470946A (en) | 1987-09-10 | 1987-09-10 | Optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22739987A JPS6470946A (en) | 1987-09-10 | 1987-09-10 | Optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6470946A true JPS6470946A (en) | 1989-03-16 |
Family
ID=16860216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22739987A Pending JPS6470946A (en) | 1987-09-10 | 1987-09-10 | Optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6470946A (en) |
-
1987
- 1987-09-10 JP JP22739987A patent/JPS6470946A/en active Pending
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