ZA791298B - Opto-electronic focussing error detection arrangement - Google Patents

Opto-electronic focussing error detection arrangement

Info

Publication number
ZA791298B
ZA791298B ZA791298A ZA791298A ZA791298B ZA 791298 B ZA791298 B ZA 791298B ZA 791298 A ZA791298 A ZA 791298A ZA 791298 A ZA791298 A ZA 791298A ZA 791298 B ZA791298 B ZA 791298B
Authority
ZA
South Africa
Prior art keywords
opto
error detection
detection arrangement
focussing error
electronic focussing
Prior art date
Application number
ZA791298A
Other languages
English (en)
Inventor
J Hazendonk
G Bouwhuis
Original Assignee
Philips 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 Nv filed Critical Philips Nv
Publication of ZA791298B publication Critical patent/ZA791298B/xx

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
    • G11B7/12—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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • 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
    • G11B7/0916—Foucault or knife-edge 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
    • G11B7/12—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
    • G11B7/1359—Single prisms
ZA791298A 1978-04-14 1979-03-19 Opto-electronic focussing error detection arrangement ZA791298B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7803969A NL7803969A (nl) 1978-04-14 1978-04-14 Opto-elektronisch fokusfout-detektiestelsel.

Publications (1)

Publication Number Publication Date
ZA791298B true ZA791298B (en) 1980-10-29

Family

ID=19830653

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA791298A ZA791298B (en) 1978-04-14 1979-03-19 Opto-electronic focussing error detection arrangement

Country Status (21)

Country Link
US (1) US4233502A (da)
JP (1) JPS54140533A (da)
AR (1) AR218529A1 (da)
AT (1) AT371268B (da)
AU (1) AU523829B2 (da)
BE (1) BE875546A (da)
BR (1) BR7902270A (da)
CA (1) CA1139878A (da)
CH (1) CH640362A5 (da)
DD (1) DD151097A5 (da)
DE (1) DE2914122C2 (da)
DK (1) DK148969C (da)
ES (1) ES479542A1 (da)
FR (1) FR2423025A1 (da)
GB (1) GB2020800B (da)
IT (1) IT1113877B (da)
NL (1) NL7803969A (da)
NZ (1) NZ190162A (da)
PL (1) PL133015B1 (da)
SE (1) SE435980B (da)
ZA (1) ZA791298B (da)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567248A (en) * 1979-07-02 1981-01-24 Hitachi Ltd Position detecting system
JPS5744236A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Optical information reproducer
JPS57111837A (en) * 1980-12-27 1982-07-12 Olympus Optical Co Ltd Signal detecting system of optical information reader
JPS57195634U (da) * 1981-06-05 1982-12-11
NL187374C (nl) * 1981-07-10 1991-09-02 Philips Nv Inrichting voor het detecteren van straling.
JPS5856236A (ja) * 1981-09-28 1983-04-02 Hitachi Ltd 光学的トラック位置検出装置およびそれを用いた光学的記録再生装置
JPS5870434A (ja) * 1981-10-22 1983-04-26 Toshiba Corp 光学ヘツド
NL8202058A (nl) * 1982-05-19 1983-12-16 Philips Nv Opto-elektronisch fokusfout-detektiestelsel.
JPS5971141A (ja) * 1982-10-14 1984-04-21 Mitsubishi Electric Corp 光学的信号読出し装置
JPS59121932A (ja) * 1982-12-28 1984-07-14 Fujitsu Ltd 自動焦点制御装置
JPS60170038A (ja) * 1984-02-14 1985-09-03 Sanyo Electric Co Ltd トラッキングサ−ボ装置
JPS60211644A (ja) * 1984-04-04 1985-10-24 Nec Corp 光学式位置検出方法及びその装置
DE3536700C3 (de) * 1985-10-15 1994-07-07 Focus Mestechnik Gmbh & Co Kg Gerät zum Ermitteln des lokalen Abstandes einer Prüffläche von einer Referenzfläche, deren geometrische Lage in bezug auf das Gerät bekannt ist
EP0248479B1 (en) * 1986-06-04 1991-11-27 Koninklijke Philips Electronics N.V. Arrangement for optically measuring a distance between a surface and a reference plane
JPH0231337A (ja) * 1988-07-21 1990-02-01 Mitsubishi Electric Corp 焦点誤差検出装置
JPH056881U (ja) * 1991-07-09 1993-01-29 株式会社ゼクセル 配線板の固定構造

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299134B (de) * 1961-12-20 1969-07-10 Agfa Gevaert Ag Vorrichtung zur Scharfeinstellung und Qualitaetspruefung von Objektiven
DE2108837C3 (de) * 1971-02-25 1973-11-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Anordnung zur Abtastung von Signalen längs mindestens einer Spur
US4005260A (en) * 1972-11-11 1977-01-25 U.S. Philips Corporation Device for reading a disk-shaped record carrier with time base correction
NL7309839A (en) * 1973-07-16 1975-01-20 Philips Nv Detector for discrepancy in focal plane - beam splitting prism feeds separate detectors
DE2500714C3 (de) * 1975-01-09 1979-07-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Einrichtung zur Kontrastmessung eines Bildes
NL177157C (nl) * 1975-02-28 1985-08-01 Philips Nv Inrichting voor het uitlezen van een vlakke registratiedrager met een optisch uitleesbare informatiestruktuur.
US4097730A (en) * 1975-07-02 1978-06-27 Zenith Radio Corporation Focus correction system for video disc player
US4047022A (en) * 1976-01-13 1977-09-06 Ernst Leitz Gmbh Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes

Also Published As

Publication number Publication date
DE2914122C2 (de) 1984-06-14
DD151097A5 (de) 1981-09-30
ATA287579A (de) 1982-10-15
DK148969C (da) 1986-09-22
BE875546A (fr) 1979-10-12
PL133015B1 (en) 1985-04-30
GB2020800A (en) 1979-11-21
FR2423025B1 (da) 1984-06-29
AR218529A1 (es) 1980-06-13
JPS54140533A (en) 1979-10-31
JPS6349291B2 (da) 1988-10-04
AT371268B (de) 1983-06-10
CA1139878A (en) 1983-01-18
ES479542A1 (es) 1979-11-16
BR7902270A (pt) 1979-12-11
CH640362A5 (de) 1983-12-30
SE7903206L (sv) 1979-10-15
GB2020800B (en) 1982-09-08
DK151379A (da) 1979-10-15
NL7803969A (nl) 1979-10-16
SE435980B (sv) 1984-10-29
AU523829B2 (en) 1982-08-19
IT1113877B (it) 1986-01-27
NZ190162A (en) 1982-05-25
DE2914122A1 (de) 1979-10-25
PL214822A1 (da) 1980-05-05
FR2423025A1 (fr) 1979-11-09
US4233502A (en) 1980-11-11
DK148969B (da) 1985-12-02
IT7921789A0 (it) 1979-04-11
AU4598779A (en) 1979-10-18

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