JPS5447627A - Control circuit for amount of exposure to light of photographing information - Google Patents
Control circuit for amount of exposure to light of photographing informationInfo
- Publication number
- JPS5447627A JPS5447627A JP11433477A JP11433477A JPS5447627A JP S5447627 A JPS5447627 A JP S5447627A JP 11433477 A JP11433477 A JP 11433477A JP 11433477 A JP11433477 A JP 11433477A JP S5447627 A JPS5447627 A JP S5447627A
- Authority
- JP
- Japan
- Prior art keywords
- exposure
- photographing information
- photographing
- amount
- light source
- 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
- Indication In Cameras, And Counting Of Exposures (AREA)
- Camera Data Copying Or Recording (AREA)
Abstract
PURPOSE: To simultaneously determine whether suitable for viewing the photographing information and photographing action or not by controlling turning on and off the lighting light source in accordance with the controlled amount of exposure to light resulting from the light source used for lighting the photographing information.
CONSTITUTION: Switch SW2 is closed by the first step stroke of release lever coupled with the depression of shutter button to energize the circuit A of exposure meter, and then the amount of exposure to light of lighting light source L for the photographing information is controlled, and concurrently transistors Tr1, Tr2 are conductive. In this case, when the voltage of electric cells E1, E2 of electric power is reduced, the voltage reduction is detected as base voltage via variable resistor 9, hence transistor Tr3 is not conductive so that the lighting light source L of the photographing information is not lighted. Therefore, immediately before photographing, the simultaneous determination whether suitable for viewing the photographing information and the photographing action in accordance with the amount of exposure to light or not can be carried out to obtain a picture free from failure
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11433477A JPS5447627A (en) | 1977-09-21 | 1977-09-21 | Control circuit for amount of exposure to light of photographing information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11433477A JPS5447627A (en) | 1977-09-21 | 1977-09-21 | Control circuit for amount of exposure to light of photographing information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5447627A true JPS5447627A (en) | 1979-04-14 |
Family
ID=14635188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11433477A Pending JPS5447627A (en) | 1977-09-21 | 1977-09-21 | Control circuit for amount of exposure to light of photographing information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5447627A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58126439U (en) * | 1982-02-22 | 1983-08-27 | 株式会社ニコン | Camera viewfinder display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5250225A (en) * | 1975-10-20 | 1977-04-22 | Canon Inc | Data photographing device for camera |
| JPS5299815A (en) * | 1976-02-17 | 1977-08-22 | Canon Inc | Switch operating member for camera |
-
1977
- 1977-09-21 JP JP11433477A patent/JPS5447627A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5250225A (en) * | 1975-10-20 | 1977-04-22 | Canon Inc | Data photographing device for camera |
| JPS5299815A (en) * | 1976-02-17 | 1977-08-22 | Canon Inc | Switch operating member for camera |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58126439U (en) * | 1982-02-22 | 1983-08-27 | 株式会社ニコン | Camera viewfinder display device |
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