JPS5579424A - Electric shutter utilizing phase synchronization of pll - Google Patents

Electric shutter utilizing phase synchronization of pll

Info

Publication number
JPS5579424A
JPS5579424A JP15203778A JP15203778A JPS5579424A JP S5579424 A JPS5579424 A JP S5579424A JP 15203778 A JP15203778 A JP 15203778A JP 15203778 A JP15203778 A JP 15203778A JP S5579424 A JPS5579424 A JP S5579424A
Authority
JP
Japan
Prior art keywords
shutter
voltage
circuit
pll
oscillator
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
JP15203778A
Other languages
Japanese (ja)
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 JP15203778A priority Critical patent/JPS5579424A/en
Publication of JPS5579424A publication Critical patent/JPS5579424A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To determine the shutter speed and aperture value automatically, by constituting the memory means of field light in PLL circuit, and controlling the shutter and iris by the output of PLL circuit.
CONSTITUTION: The pulse signal at frequency fi corresponding to the field light generated from a photoelectric transducer circuit 1 is inputted into PLL circuit 5. In the circuit 5, a voltage control oscillator 10 outputs square wave of frequency fo. When fi=fo, the oscillator 10 outputs a specified frequency. Therefore, when a switch 9 is opened in cooperation with the pressing of the previous stage of the shutter button, a capacitor 29 stores an error DC voltage. Receiving this voltage, the iris driving circuit 21 defines a potographic lens iris 24 according to this voltage. In this state, when the shutter button is further depressed, a switch 13 is closed, and a first pulse of the oscillator 10 turns on SCR 15, thereby opening the shutter. By the second pulse arriving in succession, SCR 17 becomes ON, and the shutter is closed.
COPYRIGHT: (C)1980,JPO&Japio
JP15203778A 1978-12-11 1978-12-11 Electric shutter utilizing phase synchronization of pll Pending JPS5579424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15203778A JPS5579424A (en) 1978-12-11 1978-12-11 Electric shutter utilizing phase synchronization of pll

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15203778A JPS5579424A (en) 1978-12-11 1978-12-11 Electric shutter utilizing phase synchronization of pll

Publications (1)

Publication Number Publication Date
JPS5579424A true JPS5579424A (en) 1980-06-14

Family

ID=15531667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15203778A Pending JPS5579424A (en) 1978-12-11 1978-12-11 Electric shutter utilizing phase synchronization of pll

Country Status (1)

Country Link
JP (1) JPS5579424A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0439260U (en) * 1990-07-31 1992-04-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0439260U (en) * 1990-07-31 1992-04-02

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