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JPS5445156A - Optical system - Google Patents

Optical system

Info

Publication number
JPS5445156A
JPS5445156A JP11139977A JP11139977A JPS5445156A JP S5445156 A JPS5445156 A JP S5445156A JP 11139977 A JP11139977 A JP 11139977A JP 11139977 A JP11139977 A JP 11139977A JP S5445156 A JPS5445156 A JP S5445156A
Authority
JP
Japan
Prior art keywords
light source
semiconductor laser
objective lens
light
coupling 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
JP11139977A
Other languages
Japanese (ja)
Other versions
JPS6211327B2 (en
Inventor
Keiji Kataoka
Seiji Yonezawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=14560157&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPS5445156(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11139977A priority Critical patent/JPS5445156A/en
Priority to US05/937,982 priority patent/US4235507A/en
Priority to CA311,309A priority patent/CA1109961A/en
Priority to NLAANVRAGE7809382,A priority patent/NL190494C/en
Priority to DE19782840294 priority patent/DE2840294A1/en
Priority to FR7826599A priority patent/FR2403575A1/en
Priority to GB7837018A priority patent/GB2006461B/en
Publication of JPS5445156A publication Critical patent/JPS5445156A/en
Publication of JPS6211327B2 publication Critical patent/JPS6211327B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Head (AREA)

Abstract

PURPOSE: To make possible the formation of a minute circuler spot through the use of a semiconductor laser as a light source by disposing a coupling lens of a low magnification between the light source and an objective lens.
CONSTITUTION: A coupling lens 2 of a magnification below 7 times is disposed between a light source 1 and an objective lens 3. Then, even if a semiconductor laser having light emission regions of different aspect ratios is used as the light source 1, the light distribution entering the objective lens 3 becomes circular owing to the effect of the coupling lens 2 of a low magnification and the spot 4 having been stopped down onto a disc 5 becomes a minute circular shape. Hence, the dot information on the disc 5 may be accurately reproduced while the relatively large light output of the semiconductor laser is being effectively utnilized
COPYRIGHT: (C)1979,JPO&Japio
JP11139977A 1977-09-16 1977-09-16 Optical system Granted JPS5445156A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP11139977A JPS5445156A (en) 1977-09-16 1977-09-16 Optical system
US05/937,982 US4235507A (en) 1977-09-16 1978-08-30 Optical system to condense light from a semiconductor laser into a circular spot
CA311,309A CA1109961A (en) 1977-09-16 1978-09-14 Optical system
NLAANVRAGE7809382,A NL190494C (en) 1977-09-16 1978-09-14 Optical device for editing information.
DE19782840294 DE2840294A1 (en) 1977-09-16 1978-09-15 OPTICAL SYSTEM
FR7826599A FR2403575A1 (en) 1977-09-16 1978-09-15 OPTICAL SYSTEM FOR REPRODUCTION OF INFORMATION
GB7837018A GB2006461B (en) 1977-09-16 1978-09-15 Optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11139977A JPS5445156A (en) 1977-09-16 1977-09-16 Optical system

Related Child Applications (5)

Application Number Title Priority Date Filing Date
JP58089105A Division JPS59123A (en) 1983-05-23 1983-05-23 Optical system
JP58089106A Division JPS592242A (en) 1983-05-23 1983-05-23 Optical information reproducer
JP58089107A Division JPS59124A (en) 1983-05-23 1983-05-23 Optical system
JP58089104A Division JPS592241A (en) 1983-05-23 1983-05-23 Optical system
JP58089108A Division JPS59125A (en) 1983-05-23 1983-05-23 Optical system

Publications (2)

Publication Number Publication Date
JPS5445156A true JPS5445156A (en) 1979-04-10
JPS6211327B2 JPS6211327B2 (en) 1987-03-12

Family

ID=14560157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11139977A Granted JPS5445156A (en) 1977-09-16 1977-09-16 Optical system

Country Status (1)

Country Link
JP (1) JPS5445156A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750335A (en) * 1980-09-09 1982-03-24 Mitsubishi Electric Corp Optical information reproducer
JPS59123A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS59125A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS59124A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS592241A (en) * 1983-05-23 1984-01-07 Hitachi Ltd Optical system
JPS5998329A (en) * 1983-10-28 1984-06-06 Hitachi Ltd Optical information processing device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750335A (en) * 1980-09-09 1982-03-24 Mitsubishi Electric Corp Optical information reproducer
JPS6256581B2 (en) * 1980-09-09 1987-11-26 Mitsubishi Electric Corp
JPS59123A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS59125A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS59124A (en) * 1983-05-23 1984-01-05 Hitachi Ltd Optical system
JPS592241A (en) * 1983-05-23 1984-01-07 Hitachi Ltd Optical system
JPS5998329A (en) * 1983-10-28 1984-06-06 Hitachi Ltd Optical information processing device
JPS631652B2 (en) * 1983-10-28 1988-01-13 Hitachi Ltd

Also Published As

Publication number Publication date
JPS6211327B2 (en) 1987-03-12

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