초록 ▼

There is disclosed a focus detecting device adapted for use in a camera or the like and provided with; a phototaking optical system for forming an image of the object on a reference plane; a focus detecting optical system for separating, from the light beam passing through the phototaking optical sy

There is disclosed a focus detecting device adapted for use in a camera or the like and provided with; a phototaking optical system for forming an image of the object on a reference plane; a focus detecting optical system for separating, from the light beam passing through the phototaking optical system, 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, thereby forming images of the object; a photoelectric converting device composed of plural photosensor elements and adapted to generate object image signals corresponding to the intensity distribution of the object images formed by the focus detecting optical system; a phototaking optical system information device for 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; a focus detecting optical system information device for generating information on the form of the areas on the first predetermined plane and on the first distance; a light amount distribution detecting device for 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 on the information from the phototaking optical system information device and from the focus detecting optical system information device; and a focus detection calculation device for 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.

대표청구항 ▼

A focus adjusting device comprising: a phototaking optical system which forms an image of an object in a predetermined image field; a focus detecting area designating member which designates one of a plurality of focus detecting areas, different in size, set in the image field; a focus detecting dev

A focus adjusting device comprising: a phototaking optical system which forms an image of an object in a predetermined image field; a focus detecting area designating member which designates one of a plurality of focus detecting areas, different in size, set in the image field; a focus detecting device which detects a focus condition of said phototaking optical system in the designated focus detecting area; a driving device which drives said phototaking optical system; a drive controlling circuit which controls driving of said phototaking optical system, said drive controlling circuit having at least two of the following five focus modes, (1) a manual focus mode for manually driving said phototaking optical system regardless of focus conditions, (2) a power focus mode for driving said phototaking optical system with said driving device regardless of focus conditions, (3) a single focus mode for driving said phototaking optical system to a focus point with said driving device in accordance with focus conditions, said single focus mode inhibiting said driving device from driving in accordance with focus conditions after in-focus is achieved once, (4) a continuous focus mode for always driving said phototaking optical system to a focus point with said driving device in accordance with focus conditions, and (5) a focus tracking mode for driving said phototaking optical system to a focus point with said driving device in accordance with a corrected focus condition which is corrected by adding a quantity corresponding to a movement amount of an object to a detected focus condition; and a focus mode selecting circuit which selects one of said focus modes in accordance with the designated focus detecting area to make said drive controlling circuit drive-control in the selected mode.