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AU8004391A - Optical scanning device - Google Patents

Optical scanning device

Info

Publication number
AU8004391A
AU8004391A AU80043/91A AU8004391A AU8004391A AU 8004391 A AU8004391 A AU 8004391A AU 80043/91 A AU80043/91 A AU 80043/91A AU 8004391 A AU8004391 A AU 8004391A AU 8004391 A AU8004391 A AU 8004391A
Authority
AU
Australia
Prior art keywords
silvered mirror
light beam
scanning device
optical scanning
photodetector
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.)
Abandoned
Application number
AU80043/91A
Inventor
Yasuaki Morimoto
Gerhard Weissmann
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of AU8004391A publication Critical patent/AU8004391A/en
Abandoned 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
    • 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
    • G11B7/0909—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 by astigmatic methods
    • 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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates

Landscapes

  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Communication System (AREA)
  • Vehicle Body Suspensions (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Laser Beam Printer (AREA)
  • Optical Head (AREA)
  • Microscoopes, Condenser (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Eye Examination Apparatus (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Holo Graphy (AREA)

Abstract

An optical scanning device comprises a laser which produces a light beam. The light beam is coupled by means of a half-silvered mirror (HS) to a recording medium (CD), and from there it passes through the half-silvered mirror (HS) and is reflected onto a photodetector (PD). The light beam is distributed over the photodector (PD) by a convex lens located behind the half-silvered mirror (HS). The convex lens, which is expensive and must be precisely adjusted, can be dispensed with. To this end, a transparent plate (P) is arranged between the half-silvered mirror (HS) and the photodetector (PD) at right angles to the half-silvered mirror (HS). To prevent the beam shift due to the half-silvered mirror (HS), the plate (P), for example a plate made of a material such as glass and having the same thickness as the half-silvered mirror (HS), is glued to a front face of the half-silvered mirror (HS). CD players, video disk players, DRAW disk players and magneto-optical appliances.
AU80043/91A 1989-12-23 1990-12-07 Optical scanning device Abandoned AU8004391A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942943A DE3942943A1 (en) 1989-12-23 1989-12-23 OPTICAL SCANNER
DE3942943 1989-12-23

Publications (1)

Publication Number Publication Date
AU8004391A true AU8004391A (en) 1991-07-24

Family

ID=6396430

Family Applications (1)

Application Number Title Priority Date Filing Date
AU80043/91A Abandoned AU8004391A (en) 1989-12-23 1990-12-07 Optical scanning device

Country Status (15)

Country Link
EP (1) EP0506699B1 (en)
JP (1) JPH05502538A (en)
KR (1) KR920704284A (en)
CN (1) CN1020011C (en)
AT (1) ATE102382T1 (en)
AU (1) AU8004391A (en)
DE (2) DE3942943A1 (en)
DK (1) DK0506699T3 (en)
ES (1) ES2050527T3 (en)
FI (1) FI922900A7 (en)
HK (1) HK69095A (en)
HU (1) HUT62722A (en)
MY (1) MY105281A (en)
SG (1) SG30574G (en)
WO (1) WO1991010232A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU672990B2 (en) * 1992-09-24 1996-10-24 Sony Corporation Recording/reproducing apparatus for disc-shaped recording medium, photodetector and optical head

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61236035A (en) * 1985-04-09 1986-10-21 Sony Corp Optical head
JPH0750526B2 (en) * 1986-03-15 1995-05-31 ソニー株式会社 Optical head device for disk player

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU672990B2 (en) * 1992-09-24 1996-10-24 Sony Corporation Recording/reproducing apparatus for disc-shaped recording medium, photodetector and optical head

Also Published As

Publication number Publication date
ATE102382T1 (en) 1994-03-15
FI922900A0 (en) 1992-06-22
EP0506699A1 (en) 1992-10-07
JPH05502538A (en) 1993-04-28
ES2050527T3 (en) 1994-05-16
DK0506699T3 (en) 1994-03-28
HK69095A (en) 1995-05-12
FI922900A7 (en) 1992-06-22
MY105281A (en) 1994-09-30
HUT62722A (en) 1993-05-28
CN1020011C (en) 1993-03-03
WO1991010232A1 (en) 1991-07-11
EP0506699B1 (en) 1994-03-02
DE59004837D1 (en) 1994-04-07
KR920704284A (en) 1992-12-19
HU9202043D0 (en) 1992-10-28
DE3942943A1 (en) 1991-06-27
SG30574G (en) 1995-09-18
CN1052742A (en) 1991-07-03

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