JPS5782807A - Focusing control mechanism - Google Patents

Focusing control mechanism

Info

Publication number
JPS5782807A
JPS5782807A JP55159149A JP15914980A JPS5782807A JP S5782807 A JPS5782807 A JP S5782807A JP 55159149 A JP55159149 A JP 55159149A JP 15914980 A JP15914980 A JP 15914980A JP S5782807 A JPS5782807 A JP S5782807A
Authority
JP
Japan
Prior art keywords
led
image pickup
transducer
vibration
outputs
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
JP55159149A
Other languages
Japanese (ja)
Inventor
Akira Maeda
Osamu Kaite
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP55159149A priority Critical patent/JPS5782807A/en
Publication of JPS5782807A publication Critical patent/JPS5782807A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/40—Systems for automatic generation of focusing signals using time delay of the reflected waves, e.g. of ultrasonic waves

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To obtain the consecutive focusing control signals of a video camera, by setting a photoelectric transducer at a position having an optically equal distance to the image pickup surface to vibrate it and then leading the photoelectric conversion outputs at both ends of the vibration to a peak holding circuit to compare them with each other. CONSTITUTION:An image of a subject is formed on an image pickup surface 2a of an image pickup tube 2 via a lens group 1. In this case, the reflected light branched by a half mirror 3 provided in front of the surface 2a is led to a photoelectric transducer 4, and the transducer 4 is vibrated by the output of a square wave generating circuit 6. At the same time, the photoelectric conversion outputs at both ends of the vibration are led to the 1st and 2nd peak holding circuits 11 and 14 to be compared with each other. A control signal in accordance with the level difference between the outputs of the circuits 11 and 14 is produced through a differential amplifying circuit 15. This control signal is led to a lens shift motor 5 to give a displacement to the lens group 1 toward the optical aixs.
JP55159149A 1980-11-11 1980-11-11 Focusing control mechanism Pending JPS5782807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55159149A JPS5782807A (en) 1980-11-11 1980-11-11 Focusing control mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55159149A JPS5782807A (en) 1980-11-11 1980-11-11 Focusing control mechanism

Publications (1)

Publication Number Publication Date
JPS5782807A true JPS5782807A (en) 1982-05-24

Family

ID=15687323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55159149A Pending JPS5782807A (en) 1980-11-11 1980-11-11 Focusing control mechanism

Country Status (1)

Country Link
JP (1) JPS5782807A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257825A (en) * 1975-11-07 1977-05-12 Canon Inc Automatic focus control device
JPS5449134A (en) * 1977-09-27 1979-04-18 Nippon Chemical Ind Focal plane detecting apparatus of optical system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5257825A (en) * 1975-11-07 1977-05-12 Canon Inc Automatic focus control device
JPS5449134A (en) * 1977-09-27 1979-04-18 Nippon Chemical Ind Focal plane detecting apparatus of optical system

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