FR2385171A1 - DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER - Google Patents

DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER

Info

Publication number
FR2385171A1
FR2385171A1 FR7808294A FR7808294A FR2385171A1 FR 2385171 A1 FR2385171 A1 FR 2385171A1 FR 7808294 A FR7808294 A FR 7808294A FR 7808294 A FR7808294 A FR 7808294A FR 2385171 A1 FR2385171 A1 FR 2385171A1
Authority
FR
France
Prior art keywords
radiation
astigmatic
reading
detectors
record holder
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
FR7808294A
Other languages
French (fr)
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
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2385171A1 publication Critical patent/FR2385171A1/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
    • 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

The apparatus for reading out a recording carrier (1) having an optical data structure (7) includes an astigmatic focusing error detection system, which contains an astigmatic element (11) and a radiation-sensitive detector (9), which is constructed from four part-detectors (A, B, C, D). Due to the fact that the parting lines between the part-detectors are arranged parallel and perpendicular to the effective track direction (X) and at an angle of 45 DEG to the astigmatic focus lines (12, 13), it is possible to avoid the focusing error signal being influenced by a displacement transversely to the track direction (X) of the radiation spot produced on the recording carrier.
FR7808294A 1977-03-22 1978-03-22 DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER Pending FR2385171A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7703076A NL7703076A (en) 1977-03-22 1977-03-22 DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.

Publications (1)

Publication Number Publication Date
FR2385171A1 true FR2385171A1 (en) 1978-10-20

Family

ID=19828205

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7808294A Pending FR2385171A1 (en) 1977-03-22 1978-03-22 DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER

Country Status (20)

Country Link
JP (1) JPS53117403A (en)
AR (1) AR214353A1 (en)
AT (1) AT369580B (en)
AU (1) AU510218B2 (en)
BE (1) BE865083A (en)
BR (1) BR7801690A (en)
CA (1) CA1109560A (en)
CH (1) CH627016A5 (en)
DE (1) DE2810616A1 (en)
DK (1) DK145868C (en)
ES (1) ES468055A1 (en)
FR (1) FR2385171A1 (en)
IT (1) IT1093316B (en)
MX (1) MX143603A (en)
NL (1) NL7703076A (en)
NZ (1) NZ186732A (en)
PL (1) PL113996B1 (en)
SE (1) SE424676B (en)
YU (1) YU39193B (en)
ZA (1) ZA78216B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390749A1 (en) * 1977-05-11 1978-12-08 Pioneer Electronic Corp FOCUSING APPARATUS OF AN INFORMATION READING ASSEMBLY
FR2460022A1 (en) * 1979-06-25 1981-01-16 Hitachi Ltd OPTICAL INFORMATION REPRODUCING SYSTEM
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
FR2601173A1 (en) * 1986-07-01 1988-01-08 Sanyo Electric Co OPTICAL READING HEAD FOR DIGITAL DISKS.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7907216A (en) * 1979-09-28 1981-03-31 Philips Nv OPTICAL FOCUS ERROR DETECTION SYSTEM.
JPS59125727U (en) * 1983-02-15 1984-08-24 パイオニア株式会社 Optical information pickup device
JPS6139942A (en) * 1984-08-01 1986-02-26 Matsushita Electric Ind Co Ltd Optical pickup
US4609813A (en) * 1985-03-18 1986-09-02 International Business Machines Corporation Optical systems employing ovate light beams
DE3828146A1 (en) * 1988-08-19 1990-02-22 Philips Patentverwaltung ELECTRODYNAMIC ACTUATOR FOR AN OPTICAL WRITE-IN AND READ-OUT UNIT

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501124A1 (en) * 1974-01-15 1975-08-07 Thomson Brandt FOCUS DEVICE
FR2317727A1 (en) * 1975-07-07 1977-02-04 Philips Nv DEVICE FOR READING A RECORD HOLDER WITH A REFLECTIVE INFORMATION STRUCTURE READABLE OPTICALLY
FR2325987A1 (en) * 1975-09-29 1977-04-22 Thomson Brandt OPTICAL READING DEVICE FOR A RECORDING
FR2356333A1 (en) * 1976-06-25 1978-01-20 Hitachi Ltd AUTOMATIC FOCUSING DEVICE FOR OPTICAL INFORMATION REPRODUCING EQUIPMENT, ESPECIALLY FOR VIDEO DISC
FR2385172A1 (en) * 1977-03-22 1978-10-20 Philips Nv DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337722A (en) * 1976-09-20 1978-04-07 Ebata Shiyouji Kk Method of producing concrete piles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501124A1 (en) * 1974-01-15 1975-08-07 Thomson Brandt FOCUS DEVICE
FR2271590A1 (en) * 1974-01-15 1975-12-12 Thomson Brandt
FR2317727A1 (en) * 1975-07-07 1977-02-04 Philips Nv DEVICE FOR READING A RECORD HOLDER WITH A REFLECTIVE INFORMATION STRUCTURE READABLE OPTICALLY
FR2325987A1 (en) * 1975-09-29 1977-04-22 Thomson Brandt OPTICAL READING DEVICE FOR A RECORDING
FR2356333A1 (en) * 1976-06-25 1978-01-20 Hitachi Ltd AUTOMATIC FOCUSING DEVICE FOR OPTICAL INFORMATION REPRODUCING EQUIPMENT, ESPECIALLY FOR VIDEO DISC
FR2385172A1 (en) * 1977-03-22 1978-10-20 Philips Nv DEVICE FOR READING A RADIATION-REFLECTING RECORD HOLDER

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390749A1 (en) * 1977-05-11 1978-12-08 Pioneer Electronic Corp FOCUSING APPARATUS OF AN INFORMATION READING ASSEMBLY
FR2460022A1 (en) * 1979-06-25 1981-01-16 Hitachi Ltd OPTICAL INFORMATION REPRODUCING SYSTEM
EP0156418A1 (en) * 1984-03-02 1985-10-02 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
FR2601173A1 (en) * 1986-07-01 1988-01-08 Sanyo Electric Co OPTICAL READING HEAD FOR DIGITAL DISKS.

Also Published As

Publication number Publication date
AR214353A1 (en) 1979-05-31
BR7801690A (en) 1979-01-02
MX143603A (en) 1981-06-05
NL7703076A (en) 1978-09-26
NZ186732A (en) 1981-02-11
DK145868C (en) 1983-09-12
AT369580B (en) 1983-01-10
CA1109560A (en) 1981-09-22
AU510218B2 (en) 1980-06-12
DK145868B (en) 1983-03-21
ZA78216B (en) 1979-08-29
BE865083A (en) 1978-09-20
DE2810616A1 (en) 1978-09-28
CH627016A5 (en) 1981-12-15
ES468055A1 (en) 1978-11-16
SE424676B (en) 1982-08-02
YU39193B (en) 1984-08-31
PL205453A1 (en) 1978-12-18
IT1093316B (en) 1985-07-19
ATA196578A (en) 1982-05-15
PL113996B1 (en) 1981-01-31
YU67378A (en) 1982-06-30
JPS53117403A (en) 1978-10-13
IT7821340A0 (en) 1978-03-17
DK120578A (en) 1978-09-23
AU3429478A (en) 1979-09-27
SE7803138L (en) 1978-09-23

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