초록 ▼

An automatic focus adjusting apparatus for adjusting a photo-taking lens of a camera employs a focus detecting device that includes a charge storage type image sensor device and a calculating device for calculating a defocus amount on the basis of the output of the charge storage type image sensor d

An automatic focus adjusting apparatus for adjusting a photo-taking lens of a camera employs a focus detecting device that includes a charge storage type image sensor device and a calculating device for calculating a defocus amount on the basis of the output of the charge storage type image sensor device. The charge storage type image sensor device stores charges according to incident light thereon during a charge storage period, and the calculating device calculates the defocus amount during a calculating period. In one embodiment, during the charge storage period and the calculating period, the photo-taking lens is driven at a constant speed on the basis of a correction amount required for the pursuit of a moving object to be photographed. After the calculating period the phototaking lens is driven on the basis of the defocus amount. Features of the invention are concerned with producing convergence deficiency signals; multiplying convergence deficiency signals by coefficients to provide correction amounts; controlling a mirror-up operation in accordance with whether an object moves; and determining whether an object moves.

대표청구항 ▼

An automatic focus adjusting apparatus having an imaging optical system for forming the optical image of an object, focus detecting means using a charge storage type image sensor outputting a defocus amount corresponding to the distance in the direction of the optic axis between the imaging plane of

An automatic focus adjusting apparatus having an imaging optical system for forming the optical image of an object, focus detecting means using a charge storage type image sensor outputting a defocus amount corresponding to the distance in the direction of the optic axis between the imaging plane of said imaging optical system and a predetermined imaging plane, lens driving means for driving the focus adjusting optical system of said imaging optical system, monitor means for detecting the amount of movement of said focus adjusting optical system, and control means responsive to the output of said focus detecting means and the output of said monitor means to control said lens driving means, characterized in that said apparatus has correcting means for receiving the output of said focus detecting means and the output of said monitor means with movement of said object and calculating a correction amount necessary for the driving of said focus adjusting optical system to pursue the movement of said object, and said control means controls said lens driving means so that an amount of movement of said focus adjusting optical system including the correction amount from said correcting means is attained, and so that throughout each charge storage time of said focus detecting means there is no substantial change in the speed of movement of said focus adjusting optical system.