JPS5579424A - Electric shutter utilizing phase synchronization of pll - Google Patents
Electric shutter utilizing phase synchronization of pllInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0439260U (en) * | 1990-07-31 | 1992-04-02 |
-
1978
- 1978-12-11 JP JP15203778A patent/JPS5579424A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0439260U (en) * | 1990-07-31 | 1992-04-02 |
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