Claims
- 1. In a camera usable with an electronic flash device, said camera including:
- (a) an indicating element adapted to be operated when said electronic flash device has become capable of emitting flashlight;
- (b) an electric control means for electrically adjusting at least one of a shutter time and a diaphragm aperture;
- (c) a voltage detecting circuit for detecting the voltage of a battery for driving said electric control means;
- the improvement comprising:
- a control circuit for rendering said indicating element inoperative in response to the output of said detecting circuit when the voltage of said battery is below a predetermined value, independently of whether or not said electronic flash device is in flashlight emission capable condition.
- 2. A camera according to claim 1, wherein said indicating element is a light-emitting element operated by the current from said electronic flash device, and said control circuit shuts off a current which tends to flow to said light-emitting element, in response to the output of said voltage detecting means.
- 3. A camera according to claim 1 further comprising:
- mechanical control means for mechanically adjusting said one of the shutter time and the diaphragm aperture;
- selecting means for alternatively selecting said electric control means or said mechanical control means;
- means responsive to said selecting means for forcibly rendering said control circuit inoperative when said selecting means selects said mechanical control means.
- 4. A camera according to claim 2, wherein said control circuit includes a transistor connected in series with said light-emitting element, and transistor being rendered conductive to permit the current from said electronic flash device to flow through said light-emitting element when the battery voltage exceeds the predetermined value and nonconductive to prevent flowing of the current through the light-emitting element when the battery voltage is below the predetermined value.
- 5. A camera according to claim 4, wherein said transistor regulates the current flowing through said light-emitting element to approximately a constant value.
- 6. A camera according to claim 1, further comprising a display element for indicating exposure information, and means for rendering said display element inoperative upon the operation of said indicating element at the latest.
- 7. In a camera usable with an electronic flash device detachable therefrom, said camera comprising:
- connector means for electrically connecting said camera with said electronic flash device;
- an indicating element operated by the current from said electronic flash device; and
- means for regulating the current to approximately a constant value.
- 8. A camera according to claim 7, wherein said indicating element and said regulating means are connected in series with each other.
- 9. A camera according to claim 8, wherein said indicating element is a light-emitting element and said regulating means includes a transistor connected in series with said light-emitting element.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55/74537 |
Jun 1980 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 265,951, filed May 21, 1981, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
265951 |
May 1981 |
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