| 摘要 |
A focus detecting device for use in a camera provided with; phototaking optical system forming an image of the object on a reference plane; focus detecting optical system separating, at least a pair of light beams passing through spatially different areas on a first predetermined plane axially spaced by a first distance from the reference plane, forming images of the object; photoelectric converting device composed of plural photosensor elements generating object image signals corresponding to the intensity distribution of the object images formed by the focus detecting optical system; phototaking optical system information device generating information on the shape of exit pupil at fully-open diaphragm of the phototaking optical system and on a second distance from the reference plane to the exit pupil; focus detecting optical system information device generating information on the form of the areas on the first predetermined plane and the first distance; light amount distribution detecting device determining the decrease in light amount on the plane of photosensor elements of the photoelectric converting device as light amount information relating to the position on the plane of photosensor elements, encountered when the phototaking optical system and the focus detecting optical system are combined, based upon information from the phototaking optical system information device and the focus detecting optical system information device; and focus detection calculation device effecting a process on the object image signals based on the light amount distribution information, thereby determining the defocus amount of the current object image plane relative to the reference plane.
|
