JPS5735480A - Automatic focussing device - Google Patents

Automatic focussing device

Info

Publication number
JPS5735480A
JPS5735480A JP10927680A JP10927680A JPS5735480A JP S5735480 A JPS5735480 A JP S5735480A JP 10927680 A JP10927680 A JP 10927680A JP 10927680 A JP10927680 A JP 10927680A JP S5735480 A JPS5735480 A JP S5735480A
Authority
JP
Japan
Prior art keywords
period
circuit
focus voltage
detecting
focussing
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
JP10927680A
Other languages
Japanese (ja)
Other versions
JPH0211068B2 (en
Inventor
Yoshihiro Todaka
Kaoru Yanagawa
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 JP10927680A priority Critical patent/JPS5735480A/en
Publication of JPS5735480A publication Critical patent/JPS5735480A/en
Publication of JPH0211068B2 publication Critical patent/JPH0211068B2/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
    • H04N23/40—Circuit details for pick-up tubes

Abstract

PURPOSE:To obtain a differential circuit output not affected by periodical variance, by taking the detection period of a differential circuit detecting increase/decrease of a focus voltage as an integer multiple of the variance of focus voltage. CONSTITUTION:A detection signal of an objective status detection circuit 10 is applied to a detected period switching circuit 11. This switching circuit 11 applies a basic detecting period (1V) to a differential circuit 5 to obtain a focus voltage with the detecting period of 1V for focussing. If the focus voltage is fluctuated, the circuit 11 applies a detected period signal in 3V period to the circuit 5 to obtain the focus voltage in the detecting period of 3V for focussing.
JP10927680A 1980-08-11 1980-08-11 Automatic focussing device Granted JPS5735480A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10927680A JPS5735480A (en) 1980-08-11 1980-08-11 Automatic focussing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10927680A JPS5735480A (en) 1980-08-11 1980-08-11 Automatic focussing device

Publications (2)

Publication Number Publication Date
JPS5735480A true JPS5735480A (en) 1982-02-26
JPH0211068B2 JPH0211068B2 (en) 1990-03-12

Family

ID=14506057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10927680A Granted JPS5735480A (en) 1980-08-11 1980-08-11 Automatic focussing device

Country Status (1)

Country Link
JP (1) JPS5735480A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170867A (en) * 1984-09-14 1986-04-11 Matsushita Electric Ind Co Ltd Fluorescent light flicker detector
JPH02274180A (en) * 1989-04-17 1990-11-08 Sharp Corp Automatic focusing device
JPH0678207A (en) * 1993-04-05 1994-03-18 Matsushita Electric Ind Co Ltd Fluorescent lamp flicker detector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007310004A (en) 2006-05-16 2007-11-29 Citizen Holdings Co Ltd Automatic focusing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170867A (en) * 1984-09-14 1986-04-11 Matsushita Electric Ind Co Ltd Fluorescent light flicker detector
JPH02274180A (en) * 1989-04-17 1990-11-08 Sharp Corp Automatic focusing device
JPH0678207A (en) * 1993-04-05 1994-03-18 Matsushita Electric Ind Co Ltd Fluorescent lamp flicker detector

Also Published As

Publication number Publication date
JPH0211068B2 (en) 1990-03-12

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