JPS6410431A - Protection device in optical recording and reproducing device - Google Patents

Protection device in optical recording and reproducing device

Info

Publication number
JPS6410431A
JPS6410431A JP62164377A JP16437787A JPS6410431A JP S6410431 A JPS6410431 A JP S6410431A JP 62164377 A JP62164377 A JP 62164377A JP 16437787 A JP16437787 A JP 16437787A JP S6410431 A JPS6410431 A JP S6410431A
Authority
JP
Japan
Prior art keywords
power
unlocked state
reproduction
erasure
laser
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
JP62164377A
Other languages
Japanese (ja)
Inventor
Makoto Shoji
Yuji Tsuyukuchi
Tsutomu Morita
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.)
Teac Corp
Original Assignee
Teac Corp
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 Teac Corp filed Critical Teac Corp
Priority to JP62164377A priority Critical patent/JPS6410431A/en
Publication of JPS6410431A publication Critical patent/JPS6410431A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To prevent the erroneous recording of an erasure signal and the destruction of recorded information already by bringing a power of a light source to a power at the reproduction or below or zero if any of servos is in unlocked state. CONSTITUTION:When the tracking servo 13 reaches the unlocked state during the erasure mode, a mechanical control 5 brings a ready signal to a low level and reduce the power of the laser diode to the power at the reproduction via laser power control circuit 12. When the focus servo 11 reaches the unlocked state in the recording mode, a control 5 brings the ready signal to a low level and also decreases the power of the laser diode to the power at the reproduction via the circuit 12. Even when the disk servo 6 is brought into the unlocked state in both the erasure and reproduction modes, the laser power is brought into zero.
JP62164377A 1987-07-01 1987-07-01 Protection device in optical recording and reproducing device Pending JPS6410431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62164377A JPS6410431A (en) 1987-07-01 1987-07-01 Protection device in optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62164377A JPS6410431A (en) 1987-07-01 1987-07-01 Protection device in optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6410431A true JPS6410431A (en) 1989-01-13

Family

ID=15791973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62164377A Pending JPS6410431A (en) 1987-07-01 1987-07-01 Protection device in optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6410431A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479521A2 (en) * 1990-10-01 1992-04-08 International Business Machines Corporation Operational mode control for data storage apparatus using storage disk
JP2007115403A (en) * 2000-10-25 2007-05-10 Hitachi Ltd Optical disk device and interlayer jump method
US7471597B2 (en) * 2000-10-25 2008-12-30 Hitachi, Ltd. Optical disc apparatus switching focus point between layers
JP2010118141A (en) * 2000-10-25 2010-05-27 Hitachi Ltd Optical disc device and focus jump method
US8531925B2 (en) 2011-01-13 2013-09-10 Hitachi-Lg Data Storage, Inc. Optical disc device and laser beam power controlling method for optical disc device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641540A (en) * 1979-09-10 1981-04-18 Matsushita Electric Ind Co Ltd Optical recording and reproducing unit
JPS6157043A (en) * 1984-08-27 1986-03-22 Ricoh Co Ltd Method and device for optical information recording and reproducing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641540A (en) * 1979-09-10 1981-04-18 Matsushita Electric Ind Co Ltd Optical recording and reproducing unit
JPS6157043A (en) * 1984-08-27 1986-03-22 Ricoh Co Ltd Method and device for optical information recording and reproducing

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479521A2 (en) * 1990-10-01 1992-04-08 International Business Machines Corporation Operational mode control for data storage apparatus using storage disk
JP2007115403A (en) * 2000-10-25 2007-05-10 Hitachi Ltd Optical disk device and interlayer jump method
US7471597B2 (en) * 2000-10-25 2008-12-30 Hitachi, Ltd. Optical disc apparatus switching focus point between layers
JP2010118141A (en) * 2000-10-25 2010-05-27 Hitachi Ltd Optical disc device and focus jump method
US7848190B2 (en) 2000-10-25 2010-12-07 Hitachi, Ltd. Optical disc apparatus switching focus point between layers
JP2011028846A (en) * 2000-10-25 2011-02-10 Hitachi Ltd Optical disk device and method for moving focus from one layer to another
US8284644B2 (en) 2000-10-25 2012-10-09 Hitachi, Ltd. Optical disc apparatus switching focus point between layers
US8531925B2 (en) 2011-01-13 2013-09-10 Hitachi-Lg Data Storage, Inc. Optical disc device and laser beam power controlling method for optical disc device

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