JPS57191837A - Optical recording and reproducing device - Google Patents

Optical recording and reproducing device

Info

Publication number
JPS57191837A
JPS57191837A JP7720681A JP7720681A JPS57191837A JP S57191837 A JPS57191837 A JP S57191837A JP 7720681 A JP7720681 A JP 7720681A JP 7720681 A JP7720681 A JP 7720681A JP S57191837 A JPS57191837 A JP S57191837A
Authority
JP
Japan
Prior art keywords
reproduction
recording
memory
erasure
lens
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
Application number
JP7720681A
Other languages
Japanese (ja)
Inventor
Masahiro Orukawa
Hideji Kawabata
Noriaki Hara
Akira Muto
Yoshihiko Kudo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7720681A priority Critical patent/JPS57191837A/en
Publication of JPS57191837A publication Critical patent/JPS57191837A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform recording, reproduction, and erasure freely by using a record carrier obtained by providing reproduction-only memory on one surface of an optical disk and reversible memory on the other, and performing tracking while reproducing and referring to information in the reproduction-only memory. CONSTITUTION:Light from a laser 1 is divided by a grating 2 into three beams, which are reflected by a polarizing prism 5 after passing through a collimator lens 3 and a half-wavelength plate 4, and then focused on the aluminum film 9a of a recording plate 9 through a quarter-wavelength plate 6, a tracking mirror 7, and an objective lens 8. The reflected beam travels backward to reach a four-split photodetector 15 through a condenser lens 14. The laser beam transmitted through the polarizing prism 5, on the other hand, is focused on the MnBi thin film of the recording plate 9 through a Faraday rotating element 10, a tracking mirror 12, and an objective lens 13. The reflected beam travels backward to reach the photodetector 15 through the condenser lens 14. Therefore, recording, reproduction, and erasure are performed freely.
JP7720681A 1981-05-20 1981-05-20 Optical recording and reproducing device Pending JPS57191837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7720681A JPS57191837A (en) 1981-05-20 1981-05-20 Optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7720681A JPS57191837A (en) 1981-05-20 1981-05-20 Optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS57191837A true JPS57191837A (en) 1982-11-25

Family

ID=13627350

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7720681A Pending JPS57191837A (en) 1981-05-20 1981-05-20 Optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS57191837A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD
JPS62157348A (en) * 1985-12-28 1987-07-13 Nec Home Electronics Ltd Photomagnetic disk player
JPH0329138A (en) * 1990-04-13 1991-02-07 Sanyo Electric Co Ltd Information reader
JPH03187043A (en) * 1989-12-15 1991-08-15 Fujitsu Ltd optical disk
EP0575934A3 (en) * 1992-06-23 1994-05-11 Thomson Brandt Gmbh Recording and reproduction of information in rom-ram storage media
JPH06295482A (en) * 1993-02-22 1994-10-21 Digital Equip Corp <Dec> Both side optical medium for disk storage device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD
JPS62157348A (en) * 1985-12-28 1987-07-13 Nec Home Electronics Ltd Photomagnetic disk player
JPH03187043A (en) * 1989-12-15 1991-08-15 Fujitsu Ltd optical disk
JPH0329138A (en) * 1990-04-13 1991-02-07 Sanyo Electric Co Ltd Information reader
EP0575934A3 (en) * 1992-06-23 1994-05-11 Thomson Brandt Gmbh Recording and reproduction of information in rom-ram storage media
JPH06295482A (en) * 1993-02-22 1994-10-21 Digital Equip Corp <Dec> Both side optical medium for disk storage device

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