ZA78271B - Apparatus for reading a radiation-reflecting record carrier - Google Patents

Apparatus for reading a radiation-reflecting record carrier

Info

Publication number
ZA78271B
ZA78271B ZA00780271A ZA78271A ZA78271B ZA 78271 B ZA78271 B ZA 78271B ZA 00780271 A ZA00780271 A ZA 00780271A ZA 78271 A ZA78271 A ZA 78271A ZA 78271 B ZA78271 B ZA 78271B
Authority
ZA
South Africa
Prior art keywords
radiation
reading
record carrier
reflecting record
reflecting
Prior art date
Application number
ZA00780271A
Other languages
English (en)
Inventor
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 ZA78271B publication Critical patent/ZA78271B/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
    • G11B7/08—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
ZA00780271A 1977-03-22 1978-01-16 Apparatus for reading a radiation-reflecting record carrier ZA78271B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7703077A NL7703077A (nl) 1977-03-22 1977-03-22 Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.

Publications (1)

Publication Number Publication Date
ZA78271B true ZA78271B (en) 1979-08-29

Family

ID=19828206

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00780271A ZA78271B (en) 1977-03-22 1978-01-16 Apparatus for reading a radiation-reflecting record carrier

Country Status (16)

Country Link
US (1) US4123652A (ja)
JP (1) JPS5946052B2 (ja)
AT (1) AT357205B (ja)
AU (1) AU511092B2 (ja)
BE (1) BE865084A (ja)
BR (1) BR7801691A (ja)
CA (1) CA1107395A (ja)
DE (1) DE2810570C2 (ja)
DK (1) DK120478A (ja)
ES (1) ES468056A1 (ja)
FR (1) FR2385172B1 (ja)
GB (1) GB1600160A (ja)
IT (1) IT1093397B (ja)
NL (1) NL7703077A (ja)
SE (1) SE7803078L (ja)
ZA (1) ZA78271B (ja)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7703076A (nl) * 1977-03-22 1978-09-26 Philips Nv Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.
US4290132A (en) * 1977-05-11 1981-09-15 Pioneer Electronic Corporation Focus servo device for use in an optical information read-out device
US4223348A (en) * 1977-09-12 1980-09-16 Olympus Optical Co., Ltd. Automatic focussing device
JPS55927A (en) * 1978-06-16 1980-01-07 Pioneer Video Corp Focus servo unit of optical information reader
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
JPS5690434A (en) * 1979-12-19 1981-07-22 Hitachi Ltd Optical information reproducing device
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
JPS57108811A (en) * 1980-12-26 1982-07-07 Hitachi Ltd Optical focus position detector
US4378491A (en) * 1981-01-26 1983-03-29 Lehman Thomas F Optical apparatus for sensing information from a phonograph record for controlling spacing and tracking of the pick-up relative to the record
JPS57181433A (en) * 1981-04-22 1982-11-08 Olympus Optical Co Ltd Tracking system for optical disc reproducer
DE3280137D1 (de) * 1981-09-17 1990-04-19 Toshiba Kawasaki Kk Ein optischer kopf.
JPS5877035A (ja) * 1981-10-08 1983-05-10 Mitsubishi Electric Corp 自動焦点引込み装置
NL8105579A (nl) * 1981-12-11 1983-07-01 Philips Nv Optisch fokusfoutdetektiestelsel.
US4446546A (en) * 1981-12-31 1984-05-01 Magnetic Peripherals Inc. Focus initialization system for optical recording
US4441175A (en) * 1982-01-25 1984-04-03 Magnetic Peripherals Inc. Partial beam focus sensing in an optical recording system
US4621353A (en) * 1982-09-09 1986-11-04 Burroughs Corporation Optical memory system providing improved focusing control and improved beam combining and separating apparatus
US4559622A (en) * 1982-09-09 1985-12-17 Burroughs Corporation Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system
US4622659A (en) * 1982-09-09 1986-11-11 Burroughs Corporation Focus detection and control apparatus for maintaining accurate focusing in an optical memory system by detecting reflected beam diameter variations at spaced predetermined locations
US4665512A (en) * 1983-09-29 1987-05-12 Kabushiki Kaisha Toshiba Optical head for erasing
NL8400674A (nl) * 1984-03-02 1985-10-01 Philips Nv Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid.
DE3477296D1 (en) * 1984-04-05 1989-04-20 Agfa Gevaert Nv Device for accurately focussing a laser beam
JPH0610694B2 (ja) * 1985-04-12 1994-02-09 株式会社日立製作所 自動焦点合せ方法及び装置
JPS6282525A (ja) * 1985-10-08 1987-04-16 Toshiba Corp 光学ヘツド
US5189651A (en) * 1986-05-12 1993-02-23 Pioneer Electronic Corporation Optical system in magneto-optical recording and reproducing device
NL8601719A (nl) * 1986-07-02 1988-02-01 Philips Nv Electronisch instelbare positiegevoelige stralingsdetector, focusfoutdetectiestelsel voorzien van een dergelijke stralingsdetector, en optische lees- en/of schrijfinrichting voorzien van een dergelijk focusfoutdetectiestelsel.
US4799210A (en) * 1986-11-05 1989-01-17 Unisys Corporation Fiber optic read/write head for an optical disk memory system
US4879706A (en) * 1987-07-29 1989-11-07 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
NL8703041A (nl) * 1987-12-16 1989-07-17 Philips Nv Optische aftasteenheid en een optische uitlees- en/of inschrijfinrichting daarvan voorzien.
JP2657413B2 (ja) * 1989-03-03 1997-09-24 パイオニア株式会社 光ヘッド
GB2248989B (en) * 1990-10-15 1995-05-24 Applied Magnetics Corp Focus sensing apparatus and method
US5245174A (en) * 1990-10-15 1993-09-14 Applied Magnetics Corporation Focus sensing apparatus utilizing a reflecting surface having variable reflectivity
US6124924A (en) * 1998-12-24 2000-09-26 Applied Materials, Inc. Focus error correction method and apparatus
US6794625B2 (en) 2001-05-15 2004-09-21 Applied Materials Dynamic automatic focusing method and apparatus using interference patterns
CN1267913C (zh) * 2001-11-12 2006-08-02 松下电器产业株式会社 光头及盘式记录重放装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2116872A5 (fr) * 1970-12-10 1972-07-21 Compteurs Comp D Perfectionnements aux dispositifs palpeurs optiques
FR2271590B1 (ja) * 1974-01-15 1978-12-01 Thomson Brandt
NL182990C (nl) * 1975-07-07 1988-06-16 Philips Nv Inrichting voor het uitlezen van een stralingsreflekterende registratiedrager.
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
US4025949A (en) * 1975-12-31 1977-05-24 Zenith Radio Corporation Symmetrical astigmatic focus sensing system

Also Published As

Publication number Publication date
BE865084A (fr) 1978-09-20
IT7821390A0 (it) 1978-03-20
ATA196678A (de) 1979-11-15
US4123652A (en) 1978-10-31
SE7803078L (sv) 1978-09-23
BR7801691A (pt) 1979-04-03
AT357205B (de) 1980-06-25
FR2385172B1 (fr) 1985-07-12
DK120478A (da) 1978-09-23
JPS5946052B2 (ja) 1984-11-10
AU3429378A (en) 1979-09-27
CA1107395A (en) 1981-08-18
DE2810570C2 (de) 1984-10-31
JPS53117404A (en) 1978-10-13
AU511092B2 (en) 1980-07-24
ES468056A1 (es) 1978-12-01
GB1600160A (en) 1981-10-14
FR2385172A1 (fr) 1978-10-20
NL7703077A (nl) 1978-09-26
DE2810570A1 (de) 1978-09-28
IT1093397B (it) 1985-07-19

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