JPS5713434A - Shutter control circuit of electric shutter camera - Google Patents
Shutter control circuit of electric shutter cameraInfo
- Publication number
- JPS5713434A JPS5713434A JP7116380A JP7116380A JPS5713434A JP S5713434 A JPS5713434 A JP S5713434A JP 7116380 A JP7116380 A JP 7116380A JP 7116380 A JP7116380 A JP 7116380A JP S5713434 A JPS5713434 A JP S5713434A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- power
- photometric operation
- shutter
- control circuit
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/26—Power supplies; Circuitry or arrangement to switch on the power source; Circuitry to check the power source voltage
Abstract
PURPOSE:To prevent under-exposure photographing by turning off a power voltage detecting circuit while an exposure control circuit is in photometric operation. CONSTITUTION:While a power detecting circuit 12 shows that a power battery is still undeteriorated, the hold transistor (TR) Q4 of a power holding circuit 11 is in an on-state and a shutter is kept open via a manet Mg, so that the photometric operation of an exposure control circuit 14 is started. Simultaneously, a low-level signal is applied to an NAND circuit ND1 via a resetting TR Q13 and consequently while the output of an RS type FFRS1 goes to a low level, the output of an RS type FFRS2 stays at the low level during the photometric operation. Therefore, the hold TR Q3 of the circuit 11 turns on via an inverter IN4 to detect a voltage drop by the circuit 12, and even when the TR Q4 is turned off, power is applied from the circuit 11 to the circuit 14, so that the circuit 12 is turned off substantially during the photometric operation. Thus, the open shutter is never closed during the photometric operation owing to a drop in power voltage, preventing under-exposure photographying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7116380A JPS5713434A (en) | 1980-05-27 | 1980-05-27 | Shutter control circuit of electric shutter camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7116380A JPS5713434A (en) | 1980-05-27 | 1980-05-27 | Shutter control circuit of electric shutter camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5713434A true JPS5713434A (en) | 1982-01-23 |
| JPH0241010B2 JPH0241010B2 (en) | 1990-09-14 |
Family
ID=13452688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7116380A Granted JPS5713434A (en) | 1980-05-27 | 1980-05-27 | Shutter control circuit of electric shutter camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5713434A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5249028A (en) * | 1975-10-16 | 1977-04-19 | Canon Inc | Exposure control circuit for the camera |
| JPS5296537A (en) * | 1976-02-09 | 1977-08-13 | Canon Inc | Energizing system for camera |
-
1980
- 1980-05-27 JP JP7116380A patent/JPS5713434A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5249028A (en) * | 1975-10-16 | 1977-04-19 | Canon Inc | Exposure control circuit for the camera |
| JPS5296537A (en) * | 1976-02-09 | 1977-08-13 | Canon Inc | Energizing system for camera |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0241010B2 (en) | 1990-09-14 |
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