ES468083A1 - Optical record reader - Google Patents

Optical record reader

Info

Publication number
ES468083A1
ES468083A1 ES468083A ES468083A ES468083A1 ES 468083 A1 ES468083 A1 ES 468083A1 ES 468083 A ES468083 A ES 468083A ES 468083 A ES468083 A ES 468083A ES 468083 A1 ES468083 A1 ES 468083A1
Authority
ES
Spain
Prior art keywords
focusing
radiation
information
read beam
target system
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.)
Expired
Application number
ES468083A
Other languages
Spanish (es)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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
Priority claimed from NL7703123A external-priority patent/NL7703123A/en
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES468083A1 publication Critical patent/ES468083A1/en
Expired 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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0924—Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

An improved apparatus for reading an information carrier reflective of optical radiation, which apparatus comprises a radiation source that produces a read beam, a target system for focusing the read beam at a reading point on the structure of the information of the information carrier and to form the image of the reading point on a radiation sensitive information detector whose output signal represents the information and an optical-electronic focusing error detection system for determining a deviation between the desired position and the actual position of the focusing plane of the target system, whose focusing error detection system comprises two radiation sensitive focusing detectors which cooperate with a narrow focusing beam, providing the difference between the output signal of the detectors of focusing an indication about said deviation, characterized in that the trajectory of the radiation in the read beam, one side of the optical axis of the target system includes a radiation deflection element whose surface area is substantially smaller than the cross-sectional area of the read beam. (Machine-translation by Google Translate, not legally binding)
ES468083A 1977-03-23 1978-03-21 Optical record reader Expired ES468083A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7703123A NL7703123A (en) 1977-03-23 1977-03-23 DEVICE FOR READING AN OPTICAL RADIATION-REFLECTING REGISTRATION CARRIER.
NL7706753A NL7706753A (en) 1977-03-23 1977-06-20 DEVICE FOR READING AN OPTICAL RADIATION-REFLECTING INFORMATION CARRIER.

Publications (1)

Publication Number Publication Date
ES468083A1 true ES468083A1 (en) 1978-12-16

Family

ID=26645307

Family Applications (1)

Application Number Title Priority Date Filing Date
ES468083A Expired ES468083A1 (en) 1977-03-23 1978-03-21 Optical record reader

Country Status (16)

Country Link
JP (1) JPS6028055B2 (en)
AR (1) AR217276A1 (en)
AT (1) AT371275B (en)
AU (1) AU516903B2 (en)
BE (1) BE865140A (en)
BR (1) BR7801692A (en)
CA (1) CA1116294A (en)
DD (1) DD135654A5 (en)
DE (1) DE2810566A1 (en)
DK (1) DK124478A (en)
ES (1) ES468083A1 (en)
FR (1) FR2385173A1 (en)
GB (1) GB1589035A (en)
IT (1) IT1093249B (en)
NL (1) NL7706753A (en)
SE (1) SE424677B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809635A (en) * 1978-09-22 1980-03-25 Philips Nv DEVICE FOR READING AN OPTICAL REGISTRATION CARRIER CONTAINING A RADIATION-REFLECTING INFORMATION STRUCTURE.
NL186353C (en) * 1979-06-12 1990-11-01 Philips Nv DEVICE FOR IMAGING A MASK PATTERN ON A SUBSTRATE EQUIPPED WITH AN OPTO-ELECTRONIC DETECTION SYSTEM FOR DETERMINING A DEROGATION BETWEEN THE IMAGE OF A PROJECT SYSTEM AND THE SUBSTRATE PLATE.
FR2460523A1 (en) * 1979-06-29 1981-01-23 Thomson Csf SEMICONDUCTOR LASER SOURCE OPTICAL READING HEAD AND DEVICE FOR REFLECTING AN INFORMATION MEDIUM COMPRISING SUCH AN OPTICAL HEAD
JPS5870434A (en) * 1981-10-22 1983-04-26 Toshiba Corp Optical head
JPS57186240A (en) * 1981-11-09 1982-11-16 Teac Co Optical reproducing device
JPS59119548A (en) * 1982-12-25 1984-07-10 Pioneer Electronic Corp Optical pickup device
JPS59125727U (en) * 1983-02-15 1984-08-24 パイオニア株式会社 Optical information pickup device
US4630927A (en) * 1983-02-15 1986-12-23 General Electric Company Optical projector
JPS60197950A (en) * 1984-03-22 1985-10-07 Toshiba Corp Optical head
JPH0626972Y2 (en) * 1986-10-03 1994-07-20 パイオニア株式会社 Optical pickup device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2313716A1 (en) * 1975-06-03 1976-12-31 Thomson Brandt OPTICAL READING SYSTEM BY REFLECTION OF AN INFORMATION MEDIA

Also Published As

Publication number Publication date
DE2810566A1 (en) 1978-09-28
ATA200278A (en) 1982-10-15
CA1116294A (en) 1982-01-12
AT371275B (en) 1983-06-10
JPS6028055B2 (en) 1985-07-02
SE7803140L (en) 1978-09-24
AR217276A1 (en) 1980-03-14
BR7801692A (en) 1979-01-02
AU3429278A (en) 1979-09-27
DE2810566C2 (en) 1988-01-21
DK124478A (en) 1978-09-24
NL7706753A (en) 1978-12-22
IT1093249B (en) 1985-07-19
DD135654A5 (en) 1979-05-16
BE865140A (en) 1978-09-21
IT7821384A0 (en) 1978-03-20
AU516903B2 (en) 1981-06-25
GB1589035A (en) 1981-05-07
JPS53118103A (en) 1978-10-16
SE424677B (en) 1982-08-02
FR2385173B1 (en) 1985-05-10
FR2385173A1 (en) 1978-10-20

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