JPS5280802A - Optical type information recording and reproduction apparatus - Google Patents

Optical type information recording and reproduction apparatus

Info

Publication number
JPS5280802A
JPS5280802A JP15937775A JP15937775A JPS5280802A JP S5280802 A JPS5280802 A JP S5280802A JP 15937775 A JP15937775 A JP 15937775A JP 15937775 A JP15937775 A JP 15937775A JP S5280802 A JPS5280802 A JP S5280802A
Authority
JP
Japan
Prior art keywords
information recording
type information
reproduction apparatus
optical type
condensing lens
Prior art date
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
JP15937775A
Other versions
JPS5922290B2 (en
Inventor
Masahiro Deguchi
Mitsuro Moriya
Original Assignee
Matsushita Electric Ind Co Ltd
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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP15937775A priority Critical patent/JPS5922290B2/ja
Publication of JPS5280802A publication Critical patent/JPS5280802A/en
Publication of JPS5922290B2 publication Critical patent/JPS5922290B2/ja
Application status is Expired legal-status Critical

Links

Abstract

PURPOSE: To make loop gain constant and stabilize a focus control system by changing over the amplification factor of a condensing lens drive unit at the recording and reproducing at the time of condensing incident light by means of a condensing lens on a recording medium.
COPYRIGHT: (C)1977,JPO&Japio
JP15937775A 1975-12-26 1975-12-26 Expired JPS5922290B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15937775A JPS5922290B2 (en) 1975-12-26 1975-12-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15937775A JPS5922290B2 (en) 1975-12-26 1975-12-26

Publications (2)

Publication Number Publication Date
JPS5280802A true JPS5280802A (en) 1977-07-06
JPS5922290B2 JPS5922290B2 (en) 1984-05-25

Family

ID=15692476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15937775A Expired JPS5922290B2 (en) 1975-12-26 1975-12-26

Country Status (1)

Country Link
JP (1) JPS5922290B2 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
JPS57150144A (en) * 1981-03-10 1982-09-16 Matsushita Electric Ind Co Ltd Optical recorder and reproducer
JPS57181440A (en) * 1982-04-07 1982-11-08 Hitachi Ltd Information recorder and reproducer
JPS6352332A (en) * 1987-05-29 1988-03-05 Hitachi Ltd Information recording and reproducing device
US5138596A (en) * 1988-07-11 1992-08-11 Canon Kabushiki Kaisha Optical information recording apparatus including means for delaying servo gain by a predetermined time
US5150345A (en) * 1987-08-12 1992-09-22 Canon Kabushiki Kaisha Optical information recording apparatus provided with means for sampling and holding a servo signal when the intensity of a light beam varies between intensity levels
JPH0628696A (en) * 1993-06-28 1994-02-04 Hitachi Ltd Method for recording information
US6044049A (en) * 1996-10-16 2000-03-28 Matsushita Electric Industrial Co., Ltd. Optical information apparatus employing two different tracking error signals based on regions on information medium
US6396779B1 (en) 1998-10-14 2002-05-28 Matsushita Electric Industrial Co., Ltd Optical disk apparatus having tracking control for positioning a light beam along a track on an optical disk
US6498772B1 (en) 1999-09-20 2002-12-24 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus
US7130250B2 (en) 2001-12-14 2006-10-31 Matsushita Electric Industrial Co., Ltd. Optical head and optical disk apparatus for performing focus pull in
US7190650B2 (en) 2002-08-26 2007-03-13 Matsushita Electric Industrial Co., Ltd. Optical disc drive for identifying and processing multiple optical disc types
US7257053B2 (en) 2001-04-20 2007-08-14 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus
US7307933B2 (en) 2002-01-23 2007-12-11 Matsushita Electric Industrial Co., Ltd. Optical disc drive

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
JPS6132731B2 (en) * 1979-12-28 1986-07-29 Matsushita Electric Ind Co Ltd
JPS57150144A (en) * 1981-03-10 1982-09-16 Matsushita Electric Ind Co Ltd Optical recorder and reproducer
JPH0243256B2 (en) * 1981-03-10 1990-09-27
JPS57181440A (en) * 1982-04-07 1982-11-08 Hitachi Ltd Information recorder and reproducer
JPS6352332A (en) * 1987-05-29 1988-03-05 Hitachi Ltd Information recording and reproducing device
US5150345A (en) * 1987-08-12 1992-09-22 Canon Kabushiki Kaisha Optical information recording apparatus provided with means for sampling and holding a servo signal when the intensity of a light beam varies between intensity levels
US5138596A (en) * 1988-07-11 1992-08-11 Canon Kabushiki Kaisha Optical information recording apparatus including means for delaying servo gain by a predetermined time
JPH0628696A (en) * 1993-06-28 1994-02-04 Hitachi Ltd Method for recording information
US6044049A (en) * 1996-10-16 2000-03-28 Matsushita Electric Industrial Co., Ltd. Optical information apparatus employing two different tracking error signals based on regions on information medium
US6396779B1 (en) 1998-10-14 2002-05-28 Matsushita Electric Industrial Co., Ltd Optical disk apparatus having tracking control for positioning a light beam along a track on an optical disk
US6498772B1 (en) 1999-09-20 2002-12-24 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus
US7257053B2 (en) 2001-04-20 2007-08-14 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus
US7130250B2 (en) 2001-12-14 2006-10-31 Matsushita Electric Industrial Co., Ltd. Optical head and optical disk apparatus for performing focus pull in
US7307933B2 (en) 2002-01-23 2007-12-11 Matsushita Electric Industrial Co., Ltd. Optical disc drive
US7190650B2 (en) 2002-08-26 2007-03-13 Matsushita Electric Industrial Co., Ltd. Optical disc drive for identifying and processing multiple optical disc types

Also Published As

Publication number Publication date
JPS5922290B2 (en) 1984-05-25

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