JPS6489043A - Focus controller - Google Patents

Focus controller

Info

Publication number
JPS6489043A
JPS6489043A JP24619387A JP24619387A JPS6489043A JP S6489043 A JPS6489043 A JP S6489043A JP 24619387 A JP24619387 A JP 24619387A JP 24619387 A JP24619387 A JP 24619387A JP S6489043 A JPS6489043 A JP S6489043A
Authority
JP
Japan
Prior art keywords
light beam
recording medium
information recording
point symmetry
refracting bodies
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
JP24619387A
Other languages
Japanese (ja)
Inventor
Atsushi Ishihara
Takeshi Ishika
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.)
Toshiba Corp
Toshiba Intelligent Technology Co Ltd
Original Assignee
Toshiba Corp
Toshiba Intelligent Technology 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 Toshiba Corp, Toshiba Intelligent Technology Co Ltd filed Critical Toshiba Corp
Priority to JP24619387A priority Critical patent/JPS6489043A/en
Publication of JPS6489043A publication Critical patent/JPS6489043A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To stably control a focus even when a light beam crosses groups as tracks on an optical disk successively by providing a supporting member to support plural refracting bodies, which one part of the light beam from an information recording medium passes, around an optical axis mutually in a point symmetry. CONSTITUTION:The light beam emitted from a light source 11 is focused on an information recording medium 1 by using a focusing means, and light beam components passing through plural refracting bodies provided in the light path of the reflected light beam and arranged in the point symmetry and the light beam components made incident without passing through the refracting bodies are detected. The detected detecting signal is processed, a control signal is generated, and by the control signal, the condition of the light beam converged on the information recording medium 1 is controlled. Since plural refracting bodies are supported in the point symmetry by means of the supporting member beforehand, the adjustment and assembly of an optical system can be made easy. Thus, the focus can be stably controlled.
JP24619387A 1987-09-30 1987-09-30 Focus controller Pending JPS6489043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24619387A JPS6489043A (en) 1987-09-30 1987-09-30 Focus controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24619387A JPS6489043A (en) 1987-09-30 1987-09-30 Focus controller

Publications (1)

Publication Number Publication Date
JPS6489043A true JPS6489043A (en) 1989-04-03

Family

ID=17144898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24619387A Pending JPS6489043A (en) 1987-09-30 1987-09-30 Focus controller

Country Status (1)

Country Link
JP (1) JPS6489043A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5253236A (en) * 1991-10-03 1993-10-12 International Business Machines Corporation Optical beam focusing and tracking system for an optical disk information storage device
US5396478A (en) * 1991-10-29 1995-03-07 International Business Machines Corporation Optical data storage system with aberration compensation for reduced servo crosstalk

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5253236A (en) * 1991-10-03 1993-10-12 International Business Machines Corporation Optical beam focusing and tracking system for an optical disk information storage device
US5396478A (en) * 1991-10-29 1995-03-07 International Business Machines Corporation Optical data storage system with aberration compensation for reduced servo crosstalk

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