Power supply control device for cameras
First Claim
1. In a photographic system which includes means for effecting an exposure operation of a camera, means for initiating the exposure operation, a first electronic flash means for illuminating a scene to be photographed and means for recording auxiliary data on a film, the recording means having a second electronic flash means for illuminating the data to be recorded, a power supply control device comprising:
- a first capacitor for energizing said first electronic flash means;
a second capacitor for energizing said second electronic flash means;
a voltage converter means for generating a voltage at an output terminal, said first and second capacitors being connected to said output terminal;
a first switch means manually operable independently of the camera exposure initiating means for permitting said first capacitor to be charged with the output voltage of said voltage converter; and
a second switch means operable by said initiating means for permitting said second capacitor to be charged with the output voltage of said voltage converter.
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Accused Products
Abstract
In a camera provided with a data or auxiliary information recording device and an electronic flash device for illuminating an object scene to be photographed, another electronic flash device is provided for the illumination of data to be recorded. A single power source is used for both the above two electronic flash devices and an automatic exposure control circuit. To avoid a voltage drop of the power source during the operation of the exposure control circuit due to charging of the main capacitor for the electronic flash for the scene illumination, a power supply switch for the main capacitor charging circuit is manually closed independently of the camera exposure operation. A capacitor for energizing the electronic flash for the data illumination is charged in conjunction with the camera release operation before the camera exposure is commenced.
12 Citations
10 Claims
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1. In a photographic system which includes means for effecting an exposure operation of a camera, means for initiating the exposure operation, a first electronic flash means for illuminating a scene to be photographed and means for recording auxiliary data on a film, the recording means having a second electronic flash means for illuminating the data to be recorded, a power supply control device comprising:
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a first capacitor for energizing said first electronic flash means; a second capacitor for energizing said second electronic flash means; a voltage converter means for generating a voltage at an output terminal, said first and second capacitors being connected to said output terminal; a first switch means manually operable independently of the camera exposure initiating means for permitting said first capacitor to be charged with the output voltage of said voltage converter; and a second switch means operable by said initiating means for permitting said second capacitor to be charged with the output voltage of said voltage converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification