1989-12-27
1991-01-08
Gellner, Michael L.
35419513, G03B 300
Patent
active
049840010
ABSTRACT:
A focal length display device of a camera that comprises a zoom lens unit having a lens group movable on an optical axis driven by a driver. An optical converter having a magnification can be attached to the zoom lens. A detector detects a position of the lens group and outputs a signal of lens position information data which is converted to a digital signal by an A/D converter. A detector circuit detects a state whether the optical converter is attached to the zoom lens unit or not. A focal length calculation circuit calculates the focal length in such a way than, when the detector circuit detects the state in which the optical converter is not attached, the focal length is calculated in response to the lens position, while when the detector circuit detects the state in which the optical converter is attached, the focal length is calculated in response to the lens position and the magnification of the optical converter. The calculated focal length is displayed on a display device.
REFERENCES:
patent: 4933692 (1990-06-01), Kudo et al.
Gellner Michael L.
Ricoh & Company, Ltd.
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