JPS54100723A - Electric circuit for camera - Google Patents
Electric circuit for cameraInfo
- Publication number
- JPS54100723A JPS54100723A JP755678A JP755678A JPS54100723A JP S54100723 A JPS54100723 A JP S54100723A JP 755678 A JP755678 A JP 755678A JP 755678 A JP755678 A JP 755678A JP S54100723 A JPS54100723 A JP S54100723A
- Authority
- JP
- Japan
- Prior art keywords
- led
- resistor
- point
- transistor
- light
- 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
Abstract
PURPOSE: To prevent an erroneous display and the idle trip of a shutter by connecting a resistor in series with a light emitting element for exposure photometry so that warning means may be controlled by a transistor in response to the signals obtained from the resistor.
CONSTITUTION: In a timer circuit, a point B is connected through a resistor R1 with a point E, and a switch SW1 having two contacts 1 and 2 is connected between the point E and a DC power source EB. A deflection warning LED is connected through a resistor R2 between the points A and E. A transistor Tr1 is connected in parallel with the LED and has its base connected with the point B. Thus, if the outside light is bright, the transistor Tr1 is rendered conductive to put out the LED. If, on the contrary, the outside light is dark, the Tr1 is rendered inconductive to light the LED thereby to warn shortage of exposure. Thus, it is possible to eliminate the erroneous display of the LED and the idle trip of the shutter.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP755678A JPS54100723A (en) | 1978-01-25 | 1978-01-25 | Electric circuit for camera |
US06/006,225 US4305648A (en) | 1978-01-25 | 1979-01-24 | Electric circuits for use in camera |
DE2942435A DE2942435C2 (en) | 1978-01-25 | 1979-01-25 | Electrical circuit for a camera |
DE2954054A DE2954054C2 (en) | 1978-01-25 | 1979-01-25 | Circuit for displaying insufficient light conditions in a camera |
DE2902891A DE2902891C2 (en) | 1978-01-25 | 1979-01-25 | Circuit for displaying insufficient light conditions in a camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP755678A JPS54100723A (en) | 1978-01-25 | 1978-01-25 | Electric circuit for camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54100723A true JPS54100723A (en) | 1979-08-08 |
Family
ID=11669065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP755678A Pending JPS54100723A (en) | 1978-01-25 | 1978-01-25 | Electric circuit for camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54100723A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49133027A (en) * | 1973-03-20 | 1974-12-20 | ||
JPS5218312A (en) * | 1975-08-02 | 1977-02-10 | Minolta Camera Co Ltd | Display circuit for the camera |
-
1978
- 1978-01-25 JP JP755678A patent/JPS54100723A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49133027A (en) * | 1973-03-20 | 1974-12-20 | ||
JPS5218312A (en) * | 1975-08-02 | 1977-02-10 | Minolta Camera Co Ltd | Display circuit for the camera |
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