초록 ▼

There is provided an automatic focus control device for use in a camera system comprising a focus detection control means for continuously driving a motor from the time when it is judged that a focus condition of a photograph lens can not be detected until it is judged that the focus condition can b

There is provided an automatic focus control device for use in a camera system comprising a focus detection control means for continuously driving a motor from the time when it is judged that a focus condition of a photograph lens can not be detected until it is judged that the focus condition can be detected, and a rotation number control means for controlling the rotation speed of said motor driven by said focus detection control means in accordance with a constant data designating a relationship between the rotation number of said motor and a unit of a defocus value. Accordingly, the moving speed of said photograph lens is controlled in accordance with defocus variation during the movement of said photograph lens, resulting in that the infocus position of the object can be detected by a low contrast search without overrunning the infocus position, even though the object is positioned far from an available range of the focus detection.

대표청구항 ▼

An automatic focus control device for use in a camera system comprising: a photograph lens including a lens for the focus adjustment: an image sensor means having plural pixel for detecting a pencil of light rays reflected on an object to be photographed: a data processing means for converting the d

An automatic focus control device for use in a camera system comprising: a photograph lens including a lens for the focus adjustment: an image sensor means having plural pixel for detecting a pencil of light rays reflected on an object to be photographed: a data processing means for converting the detected light quantity to data of the light quantity: a judging means for judging whether or not focus condition of said object can be detected in accordance with the data outputted by said data processing means: a calculating means for calculating a defocus value of said photograph lens in accordance with the data outputted by said data processing means, said calculating means being enabled when impossibility of the focus condition detection is judged by said judging means: a motor for moving said lens for the focus adjustment: a driving means for driving said motor in accordance with the defocus value calculated by said calculating means: a constant data outputting means for outputting constant data designating a relationship between a rotation number of said motor and a unit of the defocus value: a focus detection control means for continuously driving said motor from the time when impossibility of the focus condition detection is judged by said judging means until possibility of the focus condition detection is judged by said judging means: and a rotation number control means for controlling the rotation speed of said motor driven by said focus detection control means in accordance with the constant data outputted by said constant data outputting means.