JPS5656073A - Automatic focusing device of video camera - Google Patents

Automatic focusing device of video camera

Info

Publication number
JPS5656073A
JPS5656073A JP13082079A JP13082079A JPS5656073A JP S5656073 A JPS5656073 A JP S5656073A JP 13082079 A JP13082079 A JP 13082079A JP 13082079 A JP13082079 A JP 13082079A JP S5656073 A JPS5656073 A JP S5656073A
Authority
JP
Japan
Prior art keywords
voltage
pulse
multivibrators
signal
output signal
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
JP13082079A
Other languages
Japanese (ja)
Other versions
JPS6240908B2 (en
Inventor
Kentaro Hanma
Kaoru Yanagawa
Michio Ogimoto
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 JP13082079A priority Critical patent/JPS5656073A/en
Publication of JPS5656073A publication Critical patent/JPS5656073A/en
Publication of JPS6240908B2 publication Critical patent/JPS6240908B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To prevent focusing on a background by stabilizing the angle of field by gating a video signal with horizontal and vertical synchronizing gate signals, by using only a high frequency signal of the screen center part as a focusing signal and by applying pulse-width control over gate signals. CONSTITUTION:One-shot multivibrator 11 has a pulse length of approximately 15 microseconds and the output signal of one-shot multivibrator 17 corresponds to a part about a half as large as the horizontal center screen of a video signal applied to terminal 3. Further, one-shot multivibrator 12 has a pulse length of about 5 milliseconds and its output signal corresponds to a part about a half as large as the vertical center screen. Output signals of one-shot multivibrators 17 and 18 are supplied to analog gate circuit 19 and the component of the center screen position of the high frequency component of the output signal of gate circuit 19 is extracted and led to detector 5. As the helicoid rotates, control voltage of multivibrators 11 and 12 fluctuate to vary in pulse width respectively and at the same time, as control voltage of multivibrators 17 and 18 fluctuate, their pulse widths are varied by presetting the voltage division ratio of potentiometer 21, the voltage of electric power source 20 and the value of voltage inverting circuit 13.
JP13082079A 1979-10-12 1979-10-12 Automatic focusing device of video camera Granted JPS5656073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13082079A JPS5656073A (en) 1979-10-12 1979-10-12 Automatic focusing device of video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13082079A JPS5656073A (en) 1979-10-12 1979-10-12 Automatic focusing device of video camera

Publications (2)

Publication Number Publication Date
JPS5656073A true JPS5656073A (en) 1981-05-16
JPS6240908B2 JPS6240908B2 (en) 1987-08-31

Family

ID=15043470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13082079A Granted JPS5656073A (en) 1979-10-12 1979-10-12 Automatic focusing device of video camera

Country Status (1)

Country Link
JP (1) JPS5656073A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60220666A (en) * 1984-04-18 1985-11-05 Canon Inc Imaging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60220666A (en) * 1984-04-18 1985-11-05 Canon Inc Imaging device

Also Published As

Publication number Publication date
JPS6240908B2 (en) 1987-08-31

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