JPS54109802A - Optical system information reader - Google Patents

Optical system information reader

Info

Publication number
JPS54109802A
JPS54109802A JP1724978A JP1724978A JPS54109802A JP S54109802 A JPS54109802 A JP S54109802A JP 1724978 A JP1724978 A JP 1724978A JP 1724978 A JP1724978 A JP 1724978A JP S54109802 A JPS54109802 A JP S54109802A
Authority
JP
Japan
Prior art keywords
prism
optical system
lens
luminous flux
beam spot
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
JP1724978A
Other languages
Japanese (ja)
Inventor
Yoichi Unno
Naoto Mogi
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
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1724978A priority Critical patent/JPS54109802A/en
Publication of JPS54109802A publication Critical patent/JPS54109802A/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To reduce the energy loss of laser light and the degradation of optical system by performing the deflection of the beam spot position for tracking adjustment or jitter correction through turning or parallel moving of the prism disposed in the optical path of laser luminous flux. CONSTITUTION:The laser luminous flux 12 from a laser light source 11 transmits through a semi-transparent mirror 13, is deflected by a prism 14, is condensed by a lens 15 and is radiated as a minute beam spot on a recording medium 16 such as video disc or the like. After the laser light having been reflected is condensed by the lens 15, it is reflected by the semi-transparent mirror 13 via prism 16 and enters a photo detector 17. When in this constitution the prism 14 is turned like an arrow B, the laser luminous flux 12 intering the lens 15 deviates like the broken line, according to which the position of the beam spot on the recording medium 16 also deviates. Since the reflection loss on both faces of the prism is extremely small as compared to the reflection loss of the reflecting mirror, the loss in the optical system may be made considerably less as compared with apparatus of using conventional reflecting mirrors.
JP1724978A 1978-02-17 1978-02-17 Optical system information reader Pending JPS54109802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1724978A JPS54109802A (en) 1978-02-17 1978-02-17 Optical system information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1724978A JPS54109802A (en) 1978-02-17 1978-02-17 Optical system information reader

Publications (1)

Publication Number Publication Date
JPS54109802A true JPS54109802A (en) 1979-08-28

Family

ID=11938667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1724978A Pending JPS54109802A (en) 1978-02-17 1978-02-17 Optical system information reader

Country Status (1)

Country Link
JP (1) JPS54109802A (en)

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