IT7821340A0 - Apparato per la lettura di un elemento di supporto di registrazione, del tipo a riflessione di radiazioni. - Google Patents

Apparato per la lettura di un elemento di supporto di registrazione, del tipo a riflessione di radiazioni.

Info

Publication number
IT7821340A0
IT7821340A0 IT7821340A IT2134078A IT7821340A0 IT 7821340 A0 IT7821340 A0 IT 7821340A0 IT 7821340 A IT7821340 A IT 7821340A IT 2134078 A IT2134078 A IT 2134078A IT 7821340 A0 IT7821340 A0 IT 7821340A0
Authority
IT
Italy
Prior art keywords
reading
recording media
reflection type
media element
radiation reflection
Prior art date
Application number
IT7821340A
Other languages
English (en)
Other versions
IT1093316B (it
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 IT7821340A0 publication Critical patent/IT7821340A0/it
Application granted granted Critical
Publication of IT1093316B publication Critical patent/IT1093316B/it

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
IT21340/78A 1977-03-22 1978-03-17 Apparato per la lettura di un elemento di supporto di registrazione,del tipo a riflessione di radiazione IT1093316B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7703076A NL7703076A (nl) 1977-03-22 1977-03-22 Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.

Publications (2)

Publication Number Publication Date
IT7821340A0 true IT7821340A0 (it) 1978-03-17
IT1093316B IT1093316B (it) 1985-07-19

Family

ID=19828205

Family Applications (1)

Application Number Title Priority Date Filing Date
IT21340/78A IT1093316B (it) 1977-03-22 1978-03-17 Apparato per la lettura di un elemento di supporto di registrazione,del tipo a riflessione di radiazione

Country Status (20)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1131361A (en) * 1977-05-11 1982-09-07 Fumitaka Kotaka Focus servo device for use in optical read-out device of information
FR2460022B1 (fr) * 1979-06-25 1987-09-11 Hitachi Ltd Systeme optique de reproduction d'informations
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
JPS59125727U (ja) * 1983-02-15 1984-08-24 パイオニア株式会社 光学式情報ピツクアツプ装置
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.
JPS6139942A (ja) * 1984-08-01 1986-02-26 Matsushita Electric Ind Co Ltd 光ピツクアツプ
US4609813A (en) * 1985-03-18 1986-09-02 International Business Machines Corporation Optical systems employing ovate light beams
JPS6310326A (ja) * 1986-07-01 1988-01-16 Sanyo Electric Co Ltd 光ピツクアツプ装置
DE3828146A1 (de) * 1988-08-19 1990-02-22 Philips Patentverwaltung Elektrodynamischer aktuator fuer eine optische einschreib- und ausleseeinheit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2271590B1 (it) * 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
GB1532345A (en) * 1976-06-25 1978-11-15 Hitachi Ltd Information play-back apparatus
JPS5337722A (en) * 1976-09-20 1978-04-07 Ebata Shiyouji Kk Method of producing concrete piles
NL7703077A (nl) * 1977-03-22 1978-09-26 Philips Nv Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.

Also Published As

Publication number Publication date
SE7803138L (sv) 1978-09-23
CA1109560A (en) 1981-09-22
NZ186732A (en) 1981-02-11
AT369580B (de) 1983-01-10
MX143603A (es) 1981-06-05
DK120578A (da) 1978-09-23
AU510218B2 (en) 1980-06-12
ATA196578A (de) 1982-05-15
ZA78216B (en) 1979-08-29
PL113996B1 (en) 1981-01-31
AU3429478A (en) 1979-09-27
FR2385171A1 (fr) 1978-10-20
IT1093316B (it) 1985-07-19
YU67378A (en) 1982-06-30
DK145868C (da) 1983-09-12
CH627016A5 (en) 1981-12-15
ES468055A1 (es) 1978-11-16
SE424676B (sv) 1982-08-02
AR214353A1 (es) 1979-05-31
JPS53117403A (en) 1978-10-13
YU39193B (en) 1984-08-31
DK145868B (da) 1983-03-21
BR7801690A (pt) 1979-01-02
NL7703076A (nl) 1978-09-26
BE865083A (fr) 1978-09-20
PL205453A1 (pl) 1978-12-18
DE2810616A1 (de) 1978-09-28

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19970327