FI922900A - OPTICAL SCANNING-ANORDING. - Google Patents

OPTICAL SCANNING-ANORDING. Download PDF

Info

Publication number
FI922900A
FI922900A FI922900A FI922900A FI922900A FI 922900 A FI922900 A FI 922900A FI 922900 A FI922900 A FI 922900A FI 922900 A FI922900 A FI 922900A FI 922900 A FI922900 A FI 922900A
Authority
FI
Finland
Prior art keywords
silvered mirror
light beam
optical scanning
photodetector
players
Prior art date
Application number
FI922900A
Other languages
Finnish (fi)
Other versions
FI922900A0 (en
Inventor
Yasuaki Morimoto
Gerhard Weissmann
Original Assignee
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 Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of FI922900A publication Critical patent/FI922900A/en
Publication of FI922900A0 publication Critical patent/FI922900A0/en

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)
  • Vehicle Body Suspensions (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Communication System (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Laser Beam Printer (AREA)
  • Optical Head (AREA)
  • Microscoopes, Condenser (AREA)
  • Eye Examination Apparatus (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Holo Graphy (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Length Measuring Devices By Optical Means (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.
FI922900A 1989-12-23 1992-06-22 OPTICAL SCANNING-ANORDING. FI922900A0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3942943A DE3942943A1 (en) 1989-12-23 1989-12-23 OPTICAL SCANNER
PCT/EP1990/002117 WO1991010232A1 (en) 1989-12-23 1990-12-07 Optical scanning device

Publications (2)

Publication Number Publication Date
FI922900A true FI922900A (en) 1992-06-22
FI922900A0 FI922900A0 (en) 1992-06-22

Family

ID=6396430

Family Applications (1)

Application Number Title Priority Date Filing Date
FI922900A FI922900A0 (en) 1989-12-23 1992-06-22 OPTICAL SCANNING-ANORDING.

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) FI922900A0 (en)
HK (1) HK69095A (en)
HU (1) HUT62722A (en)
MY (1) MY105281A (en)
SG (1) SG30574G (en)
WO (1) WO1991010232A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06111334A (en) * 1992-09-24 1994-04-22 Sony Corp Recording and/or reproducing device for disk recording medium, optical detector 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

Also Published As

Publication number Publication date
DE3942943A1 (en) 1991-06-27
FI922900A0 (en) 1992-06-22
HK69095A (en) 1995-05-12
DE59004837D1 (en) 1994-04-07
JPH05502538A (en) 1993-04-28
DK0506699T3 (en) 1994-03-28
CN1052742A (en) 1991-07-03
AU8004391A (en) 1991-07-24
HUT62722A (en) 1993-05-28
EP0506699A1 (en) 1992-10-07
ES2050527T3 (en) 1994-05-16
MY105281A (en) 1994-09-30
EP0506699B1 (en) 1994-03-02
HU9202043D0 (en) 1992-10-28
SG30574G (en) 1995-09-18
CN1020011C (en) 1993-03-03
KR920704284A (en) 1992-12-19
ATE102382T1 (en) 1994-03-15
WO1991010232A1 (en) 1991-07-11

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Legal Events

Date Code Title Description
FD Application lapsed