AU5578490A - Creation of Inventions and Patents with Artificial Intelligence

AU5578490A – Focus error detection using prism-enhanced spot size monitoring
– Google Patents

AU5578490A – Focus error detection using prism-enhanced spot size monitoring
– Google Patents
Focus error detection using prism-enhanced spot size monitoring

Info

Publication number
AU5578490A

AU5578490A
AU55784/90A
AU5578490A
AU5578490A
AU 5578490 A
AU5578490 A
AU 5578490A
AU 55784/90 A
AU55784/90 A
AU 55784/90A
AU 5578490 A
AU5578490 A
AU 5578490A
AU 5578490 A
AU5578490 A
AU 5578490A
Authority
AU
Australia
Prior art keywords
prism
error detection
spot size
focus error
size monitoring
Prior art date
1989-05-26
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.)

Granted

Application number
AU55784/90A
Other versions

AU623778B2
(en

Inventor
Anthony George Dewey
Wilfried Lenth
Daniel Rugar
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.)

International Business Machines Corp

Original Assignee
International Business Machines Corp
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.)
1989-05-26
Filing date
1990-05-21
Publication date
1990-11-29

1990-05-21
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp

1990-11-29
Publication of AU5578490A
publication
Critical
patent/AU5578490A/en

1992-05-21
Application granted
granted
Critical

1992-05-21
Publication of AU623778B2
publication
Critical
patent/AU623778B2/en

2010-05-21
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

238000001514
detection method
Methods

0.000
title
1

238000012544
monitoring process
Methods

0.000
title
1

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

G11B7/0917—Focus-error methods other than those covered by G11B7/0909 – G11B7/0916

G—PHYSICS

G11—INFORMATION STORAGE

G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam

G11B7/13—Optical detectors therefor

G11B7/133—Shape of individual detector elements

G—PHYSICS

G11—INFORMATION STORAGE

G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

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

G—PHYSICS

G11—INFORMATION STORAGE

G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER

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

AU55784/90A
1989-05-26
1990-05-21
Focus error detection using prism-enhanced spot size monitoring

Ceased

AU623778B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

US35756689A

1989-05-26
1989-05-26

US357566

1989-05-26

Publications (2)

Publication Number
Publication Date

AU5578490A
true

AU5578490A
(en)

1990-11-29

AU623778B2

AU623778B2
(en)

1992-05-21

Family
ID=23406136
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU55784/90A
Ceased

AU623778B2
(en)

1989-05-26
1990-05-21
Focus error detection using prism-enhanced spot size monitoring

Country Status (9)

Country
Link

US
(1)

US5084783A
(en)

EP
(1)

EP0399977B1
(en)

JP
(1)

JPH0317835A
(en)

KR
(1)

KR930005786B1
(en)

CN
(1)

CN1027402C
(en)

AU
(1)

AU623778B2
(en)

CA
(1)

CA2012401C
(en)

DE
(1)

DE69016831T2
(en)

HK
(1)

HK90195A
(en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US5237457A
(en)

1990-10-04
1993-08-17
Asahi Kogaku Kogyo Kabushiki Kaisha
Apparatus for adjusting an optical axis including a laser beam source and a beam shaping prism

JP3157873B2
(en)

1991-11-15
2001-04-16
パイオニア株式会社

Focus control device in optical pickup device

US5448407A
(en)

1993-09-03
1995-09-05
Industrial Technology Research Institute
Equivalent wollaston prism for an optical pick-up head and an optical pick-up head using of the same

JPH07326065A
(en)

1994-05-27
1995-12-12
Hitachi Ltd
Optical information processor

US6542304B2
(en)

1999-05-17
2003-04-01
Toolz, Ltd.
Laser beam device with apertured reflective element

JP4843844B2
(en)

1999-12-27
2011-12-21
ソニー株式会社

Optical head, light emitting / receiving element, and optical recording medium recording / reproducing apparatus

KR100750093B1
(en)

2000-10-12
2007-08-21
삼성전자주식회사
Defocus error signal detecting apparatus and method used in optical pickup and seek direction detecting apparatus and method employing it

FR2847187B1
(en)

2002-11-18
2005-09-23
Le Controle Ind

SYSTEM AND METHOD FOR MOVING A POINT OF FOCUSING POWER LASER RADIATION

Family Cites Families (13)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

USRE24972E
(en)

1961-04-25

E luboshez

NL7907216A
(en)

1979-09-28
1981-03-31
Philips Nv

OPTICAL FOCUS ERROR DETECTION SYSTEM.

NL8104588A
(en)

1981-10-08
1983-05-02
Philips Nv

BUNDLE SEPARATION, METHOD FOR MANUFACTURING THIS PRISM AND OPTICAL READING AND / OR WRITING PROVIDED WITH THIS PRISM.

DE3382020D1
(en)

1982-07-15
1991-01-10
Matsushita Electric Ind Co Ltd

OPTICAL RECORDING AND PLAYBACK HEAD.

FR2546310B1
(en)

1983-05-20
1986-04-25
Thomson Csf

ADJUSTABLE FRAME FOR PIVOTING MIRROR AND OPTICAL RECORDING-READING HEAD USING SUCH A FRAME

JPS60131648A
(en)

1983-12-19
1985-07-13
Toshiba Corp
Optical head

JPH069090B2
(en)

1984-06-12
1994-02-02
株式会社東芝

Optical head

JPS6118918A
(en)

1984-07-05
1986-01-27
Ricoh Co Ltd
Beam shaping optical system

JPS61177645A
(en)

1985-01-31
1986-08-09
Fujitsu Ltd
Focus error control system

JP2596545B2
(en)

1987-01-07
1997-04-02
パイオニア株式会社

Focus error detecting device and method for selecting light receiving area width of photodetector used therein

JPH01105338A
(en)

1987-07-14
1989-04-21
Mitsubishi Electric Corp
Optical recording and reproducing device

US4793696A
(en)

1987-11-13
1988-12-27
Hoechst Celanese Corporation
Method and apparatus for rapid focus control in an optical data storage device

JPH01260636A
(en)

1988-04-12
1989-10-17
Konica Corp
Focus detecting method

1990

1990-03-16
CA
CA002012401A
patent/CA2012401C/en
not_active
Expired – Fee Related

1990-04-20
US
US07/511,664
patent/US5084783A/en
not_active
Expired – Fee Related

1990-05-11
KR
KR1019900006690A
patent/KR930005786B1/en
not_active
IP Right Cessation

1990-05-14
CN
CN90102759A
patent/CN1027402C/en
not_active
Expired – Fee Related

1990-05-21
EP
EP90850192A
patent/EP0399977B1/en
not_active
Expired – Lifetime

1990-05-21
AU
AU55784/90A
patent/AU623778B2/en
not_active
Ceased

1990-05-21
DE
DE69016831T
patent/DE69016831T2/en
not_active
Expired – Fee Related

1990-05-25
JP
JP2134232A
patent/JPH0317835A/en
active
Pending

1995

1995-06-08
HK
HK90195A
patent/HK90195A/en
unknown

Also Published As

Publication number
Publication date

JPH0317835A
(en)

1991-01-25

EP0399977B1
(en)

1995-02-15

DE69016831D1
(en)

1995-03-23

AU623778B2
(en)

1992-05-21

EP0399977A2
(en)

1990-11-28

US5084783A
(en)

1992-01-28

HK90195A
(en)

1995-06-16

CN1027402C
(en)

1995-01-11

CA2012401C
(en)

1994-05-10

CN1047584A
(en)

1990-12-05

CA2012401A1
(en)

1990-11-26

KR900018940A
(en)

1990-12-22

DE69016831T2
(en)

1995-08-10

EP0399977A3
(en)

1991-01-23

KR930005786B1
(en)

1993-06-24

Contact information