JPS55113139A - Optical information reading pickup unit - Google Patents

Optical information reading pickup unit

Info

Publication number
JPS55113139A
JPS55113139A JP1765879A JP1765879A JPS55113139A JP S55113139 A JPS55113139 A JP S55113139A JP 1765879 A JP1765879 A JP 1765879A JP 1765879 A JP1765879 A JP 1765879A JP S55113139 A JPS55113139 A JP S55113139A
Authority
JP
Japan
Prior art keywords
light sources
projected
spot
information reading
detection
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
JP1765879A
Other languages
Japanese (ja)
Inventor
Hitoshi Kanamaru
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.)
Pioneer Video Corp
Universal Pioneer Corp
Original Assignee
Pioneer Video Corp
Universal Pioneer 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 Pioneer Video Corp, Universal Pioneer Corp filed Critical Pioneer Video Corp
Priority to JP1765879A priority Critical patent/JPS55113139A/en
Publication of JPS55113139A publication Critical patent/JPS55113139A/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
    • 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

Landscapes

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

Abstract

PURPOSE:To make it possible to read and reproduce signals with high efficiency by arranging on the same plane respective light sources for recording information detection, tracking state detection and focus state detection. CONSTITUTION:Information reading light source 4, tracking state detecting light sources 5 and 6, and focus state detecting light sources 8 and 9 are so arranged that spot beam S from light source 4, spot beams T1 and T2 from light sources 5 and 6, and spot beams F1 and F2 from light sources 8 and 9 will be projected on the same straight line 20 on a recording track surface. To obtain respective detection signals with good densitivity by a SCOP system, spots T1 and T2 are projected on a track, where informatinn spot S is projected accurately, at one-fourth interval of the track pitch opposing to each other and focus spots F1 and F2 are projected on adjacent tracks or further adjacent tracks.
JP1765879A 1979-02-16 1979-02-16 Optical information reading pickup unit Pending JPS55113139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1765879A JPS55113139A (en) 1979-02-16 1979-02-16 Optical information reading pickup unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1765879A JPS55113139A (en) 1979-02-16 1979-02-16 Optical information reading pickup unit

Publications (1)

Publication Number Publication Date
JPS55113139A true JPS55113139A (en) 1980-09-01

Family

ID=11949941

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1765879A Pending JPS55113139A (en) 1979-02-16 1979-02-16 Optical information reading pickup unit

Country Status (1)

Country Link
JP (1) JPS55113139A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532522A (en) * 1981-08-28 1985-07-30 Hitachi, Ltd. Optical recording apparatus
US4648084A (en) * 1981-12-10 1987-03-03 Discovision Associates Storage medium track pitch detector
US4720825A (en) * 1984-02-06 1988-01-19 Asahi Kogaku Kogyo Kabushiki Kaisha Optical data reproducing devices having improved trick play capability
US4769802A (en) * 1984-06-07 1988-09-06 Victor Company Of Japan, Ltd. Information recording medium disc and method and apparatus for recording/reproducing information using the disc
US5483511A (en) * 1993-02-17 1996-01-09 Vixel Corporation Multiple beam optical memory system with solid-state lasers
US5619521A (en) * 1993-04-12 1997-04-08 Rohm Co., Ltd. Semiconductor laser system
US5963515A (en) * 1996-11-15 1999-10-05 Teac Corporation Optical pickup device for detecting a tracking error of a main spot on an optical disk

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532522A (en) * 1981-08-28 1985-07-30 Hitachi, Ltd. Optical recording apparatus
US4648084A (en) * 1981-12-10 1987-03-03 Discovision Associates Storage medium track pitch detector
US4720825A (en) * 1984-02-06 1988-01-19 Asahi Kogaku Kogyo Kabushiki Kaisha Optical data reproducing devices having improved trick play capability
US4769802A (en) * 1984-06-07 1988-09-06 Victor Company Of Japan, Ltd. Information recording medium disc and method and apparatus for recording/reproducing information using the disc
US5483511A (en) * 1993-02-17 1996-01-09 Vixel Corporation Multiple beam optical memory system with solid-state lasers
US5808986A (en) * 1993-02-17 1998-09-15 Vixel Corporation Multiple beam optical memory system with solid-state lasers
US5619521A (en) * 1993-04-12 1997-04-08 Rohm Co., Ltd. Semiconductor laser system
US5963515A (en) * 1996-11-15 1999-10-05 Teac Corporation Optical pickup device for detecting a tracking error of a main spot on an optical disk

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