JPS5589825A - Timer device for camera power source - Google Patents
Timer device for camera power sourceInfo
- Publication number
- JPS5589825A JPS5589825A JP16117678A JP16117678A JPS5589825A JP S5589825 A JPS5589825 A JP S5589825A JP 16117678 A JP16117678 A JP 16117678A JP 16117678 A JP16117678 A JP 16117678A JP S5589825 A JPS5589825 A JP S5589825A
- Authority
- JP
- Japan
- Prior art keywords
- power source
- transistor
- timer
- timer counter
- conducts
- 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
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Electronic Switches (AREA)
Abstract
PURPOSE: To surely cut off power source sccording to timer counters for power source by stabilizing the operations of switching transistors by way of a capacitor.
CONSTITUTION: When a switch S closes in cooperation with shutter button, the transistor Tr5 conducts and electric power is supplied to the load of exposure calculation from a primary line 10 via secondary line 20. When the switch S is opened, the transistor Tr1 conducts and the resetting of the flip-flops FF1... of the timer counter for power source is released, whereby timer counting is accomplished. Upon completion of this counting, the output of the timer counter inverts, then the transistor Tr2 goes OFF, the transistor Tr3 goes ON and the transistors Tr4, Tr5 go OFF, thereby cutting off the power source of the secondary line 20. Here, together with the OFF of the transistor Tr5 the increase in the ON resistance of the transistor Tr3 with a decrease in the output voltage is prevented by the charging charge of a capacitor C, thus the power source is surely cut off after the lapse of the specified time corresponding to the timer counter without any malfunction owing to unstable transient phenomena.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16117678A JPS5589825A (en) | 1978-12-28 | 1978-12-28 | Timer device for camera power source |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16117678A JPS5589825A (en) | 1978-12-28 | 1978-12-28 | Timer device for camera power source |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5589825A true JPS5589825A (en) | 1980-07-07 |
JPS6156901B2 JPS6156901B2 (en) | 1986-12-04 |
Family
ID=15730020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16117678A Granted JPS5589825A (en) | 1978-12-28 | 1978-12-28 | Timer device for camera power source |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5589825A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6173419A (en) * | 1984-09-19 | 1986-04-15 | Nippon Kogaku Kk <Nikon> | Power supply device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63169004U (en) * | 1987-04-22 | 1988-11-02 | ||
JPH0159502U (en) * | 1987-10-06 | 1989-04-14 | ||
JPH03114103U (en) * | 1990-03-07 | 1991-11-22 |
-
1978
- 1978-12-28 JP JP16117678A patent/JPS5589825A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6173419A (en) * | 1984-09-19 | 1986-04-15 | Nippon Kogaku Kk <Nikon> | Power supply device |
Also Published As
Publication number | Publication date |
---|---|
JPS6156901B2 (en) | 1986-12-04 |
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