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US 4,544,254 AGranted
Camera with a display device for displaying both object distance informations and coupling range informations
AssigneeCanon Kabushiki Kaisha
InventorsAkira Egawa, Ryuji Tokuda
Life of this patent
Estimating the term…
Abstract
A camera provided with a display device that displays changing of the coupling range of a strobe as the amount of charge stored on a main capacitor in the strobe changes, that is, changing of the target area for a proper exposure in stroboscopic photography, and displays an object distance obtained by the auto-focus means in a combined form.
Claims20
A camera comprising:
- a strobe device having a main capacitor and arranged for producing signals representing at least three stages of variation of a voltage level to which a main capacitor is charged;
- film speed input means for setting the speed of a film used in said camera;
- an auto-focus device for producing a distance signal representing how far away from said camera an object lies;
- computing means for computing an exposure value from a signal from said film speed input means, a signal representing the voltage level to which the main capacitor of said strobe device is charged, and the signal from said auto-focus device and finding out whether or not the exposure value for the object is proper for flash photography;
- and
- display means for displaying the distance signal of said auto-focus device upon detection of a proper exposure value by the output of said computing means.
3 more elements
A camera comprising:
- a strobe device for producing signals representing at least three levels of charge stored on a main capacitor;
- film speed input means for setting the speed of a film used in said camera;
- an auto-focus device for producing a distance signal representing how far from said camera an object lies;
- computing means for computing from a signal of said film speed input means, a signal representing the level of charge stored on the main capacitor of said strobe device and the distance signal of said auto-focus device, whether or not a proper exposure for the object results with stroboscopic photography;
- means for displaying the distance signal of said auto-focus device upon determination of a proper exposure by said computing means;
- and
- means for prohibiting a release actuation upon said computing means detecting that the object cannot be photographed.
4 more elements
A camera comprising:
- a strobe device for producing signals representing at least three stages of variation of the level of charge stored on a main capacitor and capable of firing in at least two of said three stages of the charge level;
- film speed input means for setting the speed of a film used in said camera;
- an auto-focus device for producing an output signal representing how far away from said camera an object lies;
- computing means for receiving a signal of said film speed input means, a signal representing the level of charge on the main capacitor of said strobe device and the distance signal of said auto-focus device for computing whether or not an exposure for the object is proper with stroboscopic photography;
- and
- display means for displaying the distance signal of said auto-focus device when said computing means discriminates a proper exposure is to be obtained.
3 more elements
A camera system, comprising:
- a strobe device having a main capacitor and arranged for producing signals representing at least three stages of variation of a voltage level to which a main capacitor is charged;
- an auto-focus device for producing a distance signal representing how far away from said camera an object lies;
- computing means for computing an exposure value from a signal representing the voltage level to which the main capacitor of said strobe device is charged and the distance signal from said auto-focus device, and for finding whether or not the exposure value for the object is proper for flash photography;
- and
- display means for displaying the distance signal of said auto-focus device upon detection of a proper exposure value by the output of said computing means.
2 more elements
Dependencies are inferred from the claim text.