Focus correcting device for use in a rangefinder camera
AssigneeOlympus Optical Co., Ltd.
InventorsToshihiro Imai, Toyotaka Yamada
Life of this patent
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Abstract
A focus correcting device for use in a rangefinder camera is operable to correct for a displacement of the focal point of an imaging optics which results from a change in the diaphragm aperture of an apertured diaphragm. An interlocking mechanism operationally couples a rangefinder with a focus adjusting mechanism of the imaging optics. Means is disposed in the interlocking mechanism or the focus adjusting mechanism to correct for a displacement of the focal point as the particular diaphragm aperture is established.
Claims5
A focus correcting device for use in a rangefinder camera;
- the device comprising:
- imaging optics means including an apertured diaphragm and a focus adjusting mechanism;
- a rangefinder interlocked with finder optics means and including an optical system for determining a distance to an object being photographed;
- an interlocking mechanism providing an operational coupling between said rangefinder and said focus adjusting mechanism;
- correction means operationally connected to said focus adjusting mechanism to correct for a displacement of the focal point which occurs in response to a change in the diaphragm aperature of said apertured diaphragm;
- said rangefinder including a rotatable mirror, and said correction means including a correction member disposed in said interlocking mechanism which transmits a travel of the lens of said imaging optics means required for focussing to said rotatable mirror;
- and
- said correction member being adapted to move into or out of a transmission path which transmits the travel of the lens to the rotatable mirror to thereby define a start position for the angular movement of the rotatable mirror as the diaphragm aperture is changed.
A focus correcting device for use in a rangefinder camera;
- the device comprising:
- imaging optics means including an apertured diaphragm and a focus adjusting mechanism;
- a rangefinder interlocked with finder optics means and including an optical system for determining a distance to an object being photographed;
- an interlocking mechanism providing an operational coupling between said rangefinder and said focus adjusting mechanism;
- correction means operationally connected to said focus adjusting mechanism to correct for a displacement of the focal point which occurs in response to a change in the diaphragm aperture of said apertured diaphragm;
- said correction means including a distance ring connected to a lens of said imaging optics means by coupling means for causing a movement of the lens for focussing, and
- a diaphragm ring for establishing a particular diaphragm aperture of the apertured diaphragm, said diaphragm ring acting through said coupling means to cause a movement of the lens of said imaging optics means independently of the distance ring.
Dependencies are inferred from the claim text.