Photographic camera with interchangeable lens
First Claim
1. A photographic camera having a camera body and an interchangeable lens movable relative to said body from a first position fully seated on and engaged with said body to a second position disengaged from said body and ready to be removed from said body, said camera comprising electric warning signal means, an electric circuit for operating said signal means, a first switch in said circuit, and means responsive to the position of said interchangeable lens for closing said switch to activate said signal means when said interchangeable lens moves away from its said first position.
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Accused Products
Abstract
A photographic camera has an interchangeable lens movable from a first or fully seated position on the camera body to a second disengaged position whereupon it may be removed from the camera body. An electric warning signal device has a circuit containing a switch responsive to the position of the interchangeable lens in such a way that the switch is closed to activate the warning signal as soon as the interchangeable lens begins to move away from its fully seated position. In a further development of the invention there is also a second switch in series with the first switch, and this second switch is kept closed so long as the interchangeable lens is in its first position or is in an intermediate position between its first and second positions, and this second switch is opened when the interchangeable lens reaches its second position disengaged from the camera body and ready to be removed therefrom. This second switch opens the circuit and saves drain on the battery when the interchangeable lens is completely removed from the camera.
11 Citations
7 Claims
- 1. A photographic camera having a camera body and an interchangeable lens movable relative to said body from a first position fully seated on and engaged with said body to a second position disengaged from said body and ready to be removed from said body, said camera comprising electric warning signal means, an electric circuit for operating said signal means, a first switch in said circuit, and means responsive to the position of said interchangeable lens for closing said switch to activate said signal means when said interchangeable lens moves away from its said first position.
Specification