JPS6433751A - Optical pick-up device - Google Patents

Optical pick-up device

Info

Publication number
JPS6433751A
JPS6433751A JP18964387A JP18964387A JPS6433751A JP S6433751 A JPS6433751 A JP S6433751A JP 18964387 A JP18964387 A JP 18964387A JP 18964387 A JP18964387 A JP 18964387A JP S6433751 A JPS6433751 A JP S6433751A
Authority
JP
Japan
Prior art keywords
light
zero
photodetector
separated
abnormal
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
JP18964387A
Other languages
Japanese (ja)
Inventor
Tsutomu Matsui
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP18964387A priority Critical patent/JPS6433751A/en
Publication of JPS6433751A publication Critical patent/JPS6433751A/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
    • 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

Abstract

PURPOSE:To adopt a three spots system and to present the light pick-up device of a simple constitution by separating a returning beam through a normal beam/ abnormal beam separating prism, after that, causing only a zero-th light to pass through a space filter and guiding it to a binary dividing photodetector. CONSTITUTION:A laser beam from a laser light source 1 is separated to zero-th and + or -1st lights by a diffraction grating 20 and radiated to an optical magnetic disk 7. The returning beam from the optical magnetic disk 7 is separated from a going-light path and separated to an abnormal beam and a normal beam, in which mutual optical axes are finely dislocated by a fine angle, by an Wallaston prism 24. The + or -1st light of the normal beam and abnormal beam after the separation is cut by a space filter 25 and only the zero-th light is passed through. This light is received by a bi-sectored photodetector 26 and information are reproduced according to the difference of the receiving quantity of the bi-sectored photodetector.
JP18964387A 1987-07-29 1987-07-29 Optical pick-up device Pending JPS6433751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18964387A JPS6433751A (en) 1987-07-29 1987-07-29 Optical pick-up device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18964387A JPS6433751A (en) 1987-07-29 1987-07-29 Optical pick-up device

Publications (1)

Publication Number Publication Date
JPS6433751A true JPS6433751A (en) 1989-02-03

Family

ID=16244744

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18964387A Pending JPS6433751A (en) 1987-07-29 1987-07-29 Optical pick-up device

Country Status (1)

Country Link
JP (1) JPS6433751A (en)

Similar Documents

Publication Publication Date Title
US5016954A (en) Optical pickup and hologram therefor
AU1291688A (en) Optical space switch
KR900002999B1 (en) Optical pickup
JPS51144203A (en) Political device for information reproduction
MY116529A (en) Optical pickup
CA2001143A1 (en) Optical pickup device having multiple diffraction regions
EP0283002A3 (en) Optical head
GB2082344B (en) Optical beam splitter prism system of signal pickup device
CA2008593A1 (en) Laser optical pickup apparatus
JPS57141032A (en) Optical head and information reproducing device
JPS6433751A (en) Optical pick-up device
JPS56158319A (en) Light projecting device
KR0121313Y1 (en) Optical pick-up device
JPS6455745A (en) Optical pickup device
KR970008231B1 (en) Optical pick-up apparatus
JPS6486337A (en) Hologram
JPH0376035A (en) Hologram system optical pickup
JPS5750329A (en) Optical reproducing device
JPS57205833A (en) Optical reproducing device
EP1351227A4 (en) Optical pickup and optical disc drive
JPS6453359A (en) Optical pickup device
EP0510283A2 (en) Optical pickup device
JPH0519852Y2 (en)
JP2693569B2 (en) Optical information recording / reproducing device
JPS6482624A (en) Device for alignment