JPS5744235A - Optical information recorder and reproducer - Google Patents

Optical information recorder and reproducer

Info

Publication number
JPS5744235A
JPS5744235A JP11958780A JP11958780A JPS5744235A JP S5744235 A JPS5744235 A JP S5744235A JP 11958780 A JP11958780 A JP 11958780A JP 11958780 A JP11958780 A JP 11958780A JP S5744235 A JPS5744235 A JP S5744235A
Authority
JP
Japan
Prior art keywords
lens
beams
condensed
disk
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.)
Granted
Application number
JP11958780A
Other languages
Japanese (ja)
Other versions
JPS6055890B2 (en
Inventor
Kazuo Okada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11958780A priority Critical patent/JPS6055890B2/en
Publication of JPS5744235A publication Critical patent/JPS5744235A/en
Publication of JPS6055890B2 publication Critical patent/JPS6055890B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only

Landscapes

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

Abstract

PURPOSE:To obtain a focusing sensor which is unified with a lens, by providing a convex lens at the area near the outer edge part of the incident parallel light flux to an objective lens that focuses the beams onto an information carrier. CONSTITUTION:The beams radiated from a semiconductor laser 21 are made parallel to each other by a collimator lens 22 and condensed on an information disk 24 by an objective lens 23. The reflected beams go backward to be made incident to the laser 21, and the information is detected by the beams emitted from the laser 21. While the parallel beams are condensed by a small-sized condenser lens 26 like a fiber lens attached at the outer edge part of an attachment metallic parts 28 and then made incident to the disk 24. The reflected beams from the disk 24 are condensed on a 2-split photodetector 27 attached to the parts 28 and via the lens 23. In such way, a focusing sensor 27 which is unified with the lens 26 is obtained.
JP11958780A 1980-08-26 1980-08-26 Optical information recording and reproducing device Expired JPS6055890B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11958780A JPS6055890B2 (en) 1980-08-26 1980-08-26 Optical information recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11958780A JPS6055890B2 (en) 1980-08-26 1980-08-26 Optical information recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS5744235A true JPS5744235A (en) 1982-03-12
JPS6055890B2 JPS6055890B2 (en) 1985-12-07

Family

ID=14765053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11958780A Expired JPS6055890B2 (en) 1980-08-26 1980-08-26 Optical information recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6055890B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0281330A (en) * 1988-09-19 1990-03-22 Hitachi Ltd Optical recording and reproducing device
KR20180069016A (en) 2015-11-16 2018-06-22 미츠비시 히타치 쓰루 가부시키가이샤 Interchangeable rotary cutting tools and inserts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0281330A (en) * 1988-09-19 1990-03-22 Hitachi Ltd Optical recording and reproducing device
KR20180069016A (en) 2015-11-16 2018-06-22 미츠비시 히타치 쓰루 가부시키가이샤 Interchangeable rotary cutting tools and inserts

Also Published As

Publication number Publication date
JPS6055890B2 (en) 1985-12-07

Similar Documents

Publication Publication Date Title
EP0326354A3 (en) Apparatus for reading information out of an optical recording medium
ATE83088T1 (en) OPTICAL READER.
JPS5744235A (en) Optical information recorder and reproducer
JPS56156937A (en) Optical pickup device
JPS62173650A (en) Optical information reproducing device
JPS57189348A (en) Auto-focus system of optical disk
JPH05273491A (en) Photodetector
JPS57172306A (en) Focus controller of optical recording system
JPS573234A (en) Optical recorder and reproducer
JPS6446242A (en) Optical pickup
JPS5470004A (en) Optical information reader
JPS57154657A (en) Optical type information reproducing device
JPS6413246A (en) Optical head for magneto-optical storage
JPS6297147A (en) Optical pickup
JPS55160335A (en) Photodisk recorder
JPS6410433A (en) Optical information reader
JPS5570942A (en) Tracking error detector
JPS57169933A (en) Optical disc reproducer
JPS6479944A (en) Optical pickup device
JPS5788535A (en) Pickup device
JPS5661044A (en) Optical information reader
JPS57105716A (en) Reflected ray read device
JPS6427288A (en) Semiconductor device
JPS5737748A (en) Automatic focusing system of optical disk
JPS6440912A (en) Lens for optical recording and reproducing device