DK145868C - DEVICE FOR READING A RADIATOR REFLECTING REGISTRAR AND INCLUDING A FOCUS ERROR DETECTOR - Google Patents

DEVICE FOR READING A RADIATOR REFLECTING REGISTRAR AND INCLUDING A FOCUS ERROR DETECTOR

Info

Publication number: DK145868C
Authority: DK; Denmark
Prior art keywords: registrar; reading; focus error; error detector; radiator
Prior art date: 1977-03-22

Application number

DK120578A

Other languages

Danish (da)

Other versions

DK120578A (en

DK145868B (en

Inventor

Hendrik T Lam

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.)

1977-03-22

Filing date

1978-03-17

Publication date

1983-09-12

1978-03-17 Application filed by Philips Nv filed Critical Philips Nv

1978-09-23 Publication of DK120578A publication Critical patent/DK120578A/en

1983-03-21 Publication of DK145868B publication Critical patent/DK145868B/en

1983-09-12 Application granted granted Critical

1983-09-12 Publication of DK145868C publication Critical patent/DK145868C/en

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

DK120578A 1977-03-22 1978-03-17 DEVICE FOR READING A RADIATOR REFLECTING REGISTRAR AND INCLUDING A FOCUS ERROR DETECTOR DK145868C (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
NL7703076A NL7703076A (en)	1977-03-22	1977-03-22	DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.
NL7703076		1977-03-22

Publications (3)

Publication Number	Publication Date
DK120578A DK120578A (en)	1978-09-23
DK145868B DK145868B (en)	1983-03-21
DK145868C true DK145868C (en)	1983-09-12

Family

ID=19828205

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
DK120578A DK145868C (en)	1977-03-22	1978-03-17	DEVICE FOR READING A RADIATOR REFLECTING REGISTRAR AND INCLUDING A FOCUS ERROR DETECTOR

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)

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 (en) *	1979-06-25	1987-09-11	Hitachi Ltd	OPTICAL INFORMATION REPRODUCING SYSTEM
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
NL8400674A (en) *	1984-03-02	1985-10-01	Philips Nv	DEVICE FOR REGISTERING AND / OR READING INFORMATION IN A TRACK OF A REFLECTIVE RECORD CARRIER WITH A FOCUS CONTROL WITH REDUCED SPOT OFFSET SENSITIVITY.
JPS6139942A (en) *	1984-08-01	1986-02-26	Matsushita Electric Ind Co Ltd	light pick up
US4609813A (en) *	1985-03-18	1986-09-02	International Business Machines Corporation	Optical systems employing ovate light beams
JPS6310326A (en) *	1986-07-01	1988-01-16	Sanyo Electric Co Ltd	Optical pickup device
DE3828146A1 (en) *	1988-08-19	1990-02-22	Philips Patentverwaltung	ELECTRODYNAMIC ACTUATOR FOR AN OPTICAL WRITE-IN AND READ-OUT UNIT

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2271590B1 (en) *	1974-01-15	1978-12-01	Thomson Brandt
NL182990C (en) *	1975-07-07	1988-06-16	Philips Nv	DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.
FR2325987A1 (en) *	1975-09-29	1977-04-22	Thomson Brandt	OPTICAL READING DEVICE FOR A RECORDING
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 (en) *	1977-03-22	1978-09-26	Philips Nv	DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.

1977
- 1977-03-22 NL NL7703076A patent/NL7703076A/en not_active Application Discontinuation
1978
- 1978-01-12 ZA ZA00780216A patent/ZA78216B/en unknown
- 1978-02-06 AR AR270983A patent/AR214353A1/en active
- 1978-03-11 DE DE19782810616 patent/DE2810616A1/en active Pending
- 1978-03-15 CA CA298,999A patent/CA1109560A/en not_active Expired
- 1978-03-17 MX MX172816A patent/MX143603A/en unknown
- 1978-03-17 DK DK120578A patent/DK145868C/en not_active IP Right Cessation
- 1978-03-17 IT IT21340/78A patent/IT1093316B/en active
- 1978-03-20 BR BR7801690A patent/BR7801690A/en unknown
- 1978-03-20 AT AT0196578A patent/AT369580B/en not_active IP Right Cessation
- 1978-03-20 AU AU34294/78A patent/AU510218B2/en not_active Expired
- 1978-03-20 PL PL1978205453A patent/PL113996B1/en unknown
- 1978-03-20 CH CH302678A patent/CH627016A5/en not_active IP Right Cessation
- 1978-03-20 BE BE186087A patent/BE865083A/en not_active IP Right Cessation
- 1978-03-20 NZ NZ186732A patent/NZ186732A/en unknown
- 1978-03-20 SE SE7803138A patent/SE424676B/en not_active IP Right Cessation
- 1978-03-20 ES ES468055A patent/ES468055A1/en not_active Expired
- 1978-03-21 YU YU00673/78A patent/YU39193B/en unknown
- 1978-03-22 FR FR7808294A patent/FR2385171A1/en active Pending
- 1978-03-22 JP JP3182778A patent/JPS53117403A/en active Pending

Also Published As

Publication number	Publication date
AU510218B2 (en)	1980-06-12
PL205453A1 (en)	1978-12-18
AR214353A1 (en)	1979-05-31
IT7821340A0 (en)	1978-03-17
ZA78216B (en)	1979-08-29
DK120578A (en)	1978-09-23
BR7801690A (en)	1979-01-02
DE2810616A1 (en)	1978-09-28
BE865083A (en)	1978-09-20
AU3429478A (en)	1979-09-27
NL7703076A (en)	1978-09-26
DK145868B (en)	1983-03-21
YU67378A (en)	1982-06-30
YU39193B (en)	1984-08-31
CH627016A5 (en)	1981-12-15
ES468055A1 (en)	1978-11-16
PL113996B1 (en)	1981-01-31
FR2385171A1 (en)	1978-10-20
JPS53117403A (en)	1978-10-13
AT369580B (en)	1983-01-10
CA1109560A (en)	1981-09-22
NZ186732A (en)	1981-02-11
SE7803138L (en)	1978-09-23
ATA196578A (en)	1982-05-15
SE424676B (en)	1982-08-02
MX143603A (en)	1981-06-05
IT1093316B (en)	1985-07-19

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DK124478A (en)	1978-09-24	DEVICE FOR READING A REGISTRATION CARRIER REFLECTING OPTICAL RADIATION
DK152078A (en)	1978-10-15	PROCEDURE AND DEVICE FOR DETERMINING A TIME
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Legal Events

Date	Code	Title	Description
1998-04-20	PUP	Patent expired