JPS531003A - Self-focusing system - Google Patents

Self-focusing system

Info

Publication number
JPS531003A
JPS531003A JP7435376A JP7435376A JPS531003A JP S531003 A JPS531003 A JP S531003A JP 7435376 A JP7435376 A JP 7435376A JP 7435376 A JP7435376 A JP 7435376A JP S531003 A JPS531003 A JP S531003A
Authority
JP
Japan
Prior art keywords
self
focusing system
axis
video disc
reproduction information
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
JP7435376A
Other languages
Japanese (ja)
Other versions
JPS5337722B2 (en
Inventor
Moriji Izumida
Takeshi Maeda
Yoshito Tsunoda
Susumu Sawano
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
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7435376A priority Critical patent/JPS531003A/en
Priority to GB26176/77A priority patent/GB1532345A/en
Priority to DE2728624A priority patent/DE2728624C2/en
Priority to NLAANVRAGE7707071,A priority patent/NL187716C/en
Priority to FR7719366A priority patent/FR2356333A1/en
Priority to US05/810,166 priority patent/US4293944A/en
Publication of JPS531003A publication Critical patent/JPS531003A/en
Publication of JPS5337722B2 publication Critical patent/JPS5337722B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To eliminate lens focus shift by having the axis of a cylindrical lens placed about 45° in angle against the direction of the reproduction information track of the video disc.
COPYRIGHT: (C)1978,JPO&Japio
JP7435376A 1976-06-25 1976-06-25 Self-focusing system Granted JPS531003A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP7435376A JPS531003A (en) 1976-06-25 1976-06-25 Self-focusing system
GB26176/77A GB1532345A (en) 1976-06-25 1977-06-22 Information play-back apparatus
DE2728624A DE2728624C2 (en) 1976-06-25 1977-06-24 Self-focusing device for scanning an information track contained on a recording medium
NLAANVRAGE7707071,A NL187716C (en) 1976-06-25 1977-06-24 DEVICE FOR OPTICAL READING OF INFORMATION IN TRACKS OF A RECORD MEDIUM.
FR7719366A FR2356333A1 (en) 1976-06-25 1977-06-24 AUTOMATIC FOCUSING DEVICE FOR OPTICAL INFORMATION REPRODUCING EQUIPMENT, ESPECIALLY FOR VIDEO DISC
US05/810,166 US4293944A (en) 1976-06-25 1977-06-27 Information play-back apparatus with astigmatic auto-focusing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7435376A JPS531003A (en) 1976-06-25 1976-06-25 Self-focusing system

Publications (2)

Publication Number Publication Date
JPS531003A true JPS531003A (en) 1978-01-07
JPS5337722B2 JPS5337722B2 (en) 1978-10-11

Family

ID=13544666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7435376A Granted JPS531003A (en) 1976-06-25 1976-06-25 Self-focusing system

Country Status (1)

Country Link
JP (1) JPS531003A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102553948B1 (en) * 2023-02-14 2023-07-10 김기수 Water treatment apparatus for reduction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834240B2 (en) * 1979-12-29 1983-07-25 住友金属工業株式会社 Steel material welding method and backing device for welded steel pipes used in the welding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102553948B1 (en) * 2023-02-14 2023-07-10 김기수 Water treatment apparatus for reduction

Also Published As

Publication number Publication date
JPS5337722B2 (en) 1978-10-11

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