JPS55161220A - Automatic aperture control unit in phase synchronizing system - Google Patents

Automatic aperture control unit in phase synchronizing system

Info

Publication number
JPS55161220A
JPS55161220A JP6744979A JP6744979A JPS55161220A JP S55161220 A JPS55161220 A JP S55161220A JP 6744979 A JP6744979 A JP 6744979A JP 6744979 A JP6744979 A JP 6744979A JP S55161220 A JPS55161220 A JP S55161220A
Authority
JP
Japan
Prior art keywords
frequency
voltage
signal
aperture
response 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
JP6744979A
Other languages
Japanese (ja)
Other versions
JPS6219731B2 (en
Inventor
Tsukumo Nobusawa
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP6744979A priority Critical patent/JPS55161220A/en
Publication of JPS55161220A publication Critical patent/JPS55161220A/en
Publication of JPS6219731B2 publication Critical patent/JPS6219731B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)

Abstract

PURPOSE: To control aperture based on the error DC voltage generated according to input frequency in the PLL circuit by applying the light response signal of which the frequency changes according to the intensity of subject light to said circuit.
CONSTITUTION: The light response signal is emitted from a light response signal generator 1 at the frequency f0 corresponding to the intensity of the subject light detected by a photoelectric transducer P and this signal is applied to the detection input end of a phase detector 31. On the other hand, the signal of the frequency f1 which is first within the specified range is oscillated from a voltage control osicllator 34 and this signal is applied to the synchronizing input end of a phase detector 31. The frequencies and phase of both signals are compared and owing to the synchronizing action of a PLL circuit 3, the frequency f1 becomes equal in synchronization with the frequency f0. According to the frequency f1 of the oscillator 34 of this time, the error DC voltage Vd1 of a fixed magnitude is generated in the output side of an amplifier 33. This voltage Vd1 is held and stored in a capacitor Cm. Based on this stored voltage Vd1, the aperture F is stopped down to the specified value according to the subject light under fixed shutter time by an aperture control unit 5.
COPYRIGHT: (C)1980,JPO&Japio
JP6744979A 1979-06-01 1979-06-01 Automatic aperture control unit in phase synchronizing system Granted JPS55161220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6744979A JPS55161220A (en) 1979-06-01 1979-06-01 Automatic aperture control unit in phase synchronizing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6744979A JPS55161220A (en) 1979-06-01 1979-06-01 Automatic aperture control unit in phase synchronizing system

Publications (2)

Publication Number Publication Date
JPS55161220A true JPS55161220A (en) 1980-12-15
JPS6219731B2 JPS6219731B2 (en) 1987-04-30

Family

ID=13345237

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6744979A Granted JPS55161220A (en) 1979-06-01 1979-06-01 Automatic aperture control unit in phase synchronizing system

Country Status (1)

Country Link
JP (1) JPS55161220A (en)

Also Published As

Publication number Publication date
JPS6219731B2 (en) 1987-04-30

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