JPS5266448A - Automatic focusing system - Google Patents

Automatic focusing system

Info

Publication number
JPS5266448A
JPS5266448A JP14165475A JP14165475A JPS5266448A JP S5266448 A JPS5266448 A JP S5266448A JP 14165475 A JP14165475 A JP 14165475A JP 14165475 A JP14165475 A JP 14165475A JP S5266448 A JPS5266448 A JP S5266448A
Authority
JP
Japan
Prior art keywords
automatic focusing
focusing system
laser beams
focusing
circumscribing
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.)
Pending
Application number
JP14165475A
Other languages
Japanese (ja)
Inventor
Toshimitsu Miyauchi
Yoshito Tsunoda
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 JP14165475A priority Critical patent/JPS5266448A/en
Publication of JPS5266448A publication Critical patent/JPS5266448A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE: Vertical movement of information recording media is detected and focusing is performed by disposing a photo detector circumscribing to laser beams in front of a focusing lens and receiving the laser beams reflected therefrom.
COPYRIGHT: (C)1977,JPO&Japio
JP14165475A 1975-11-28 1975-11-28 Automatic focusing system Pending JPS5266448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14165475A JPS5266448A (en) 1975-11-28 1975-11-28 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14165475A JPS5266448A (en) 1975-11-28 1975-11-28 Automatic focusing system

Publications (1)

Publication Number Publication Date
JPS5266448A true JPS5266448A (en) 1977-06-01

Family

ID=15297059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14165475A Pending JPS5266448A (en) 1975-11-28 1975-11-28 Automatic focusing system

Country Status (1)

Country Link
JP (1) JPS5266448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131776A (en) * 1982-01-29 1983-08-05 Olympus Optical Co Ltd Photoelectric element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58131776A (en) * 1982-01-29 1983-08-05 Olympus Optical Co Ltd Photoelectric element

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