초록 ▼

A focus detecting device for determining the focus state of an imaging optical system, of a type for time-sequentially entering light beams, transmitted by different areas of an imaging optical system, into a sensor and detecting the phase difference between the image signal obtained from the sensor

A focus detecting device for determining the focus state of an imaging optical system, of a type for time-sequentially entering light beams, transmitted by different areas of an imaging optical system, into a sensor and detecting the phase difference between the image signal obtained from the sensor means corresponding to such time-sequentially entered light beams.The device determines the positional difference in the vertical direction of the light beams (images) time-sequentially entering the sensor, and determines the storage positions of the outputs (image signals) from the sensor corresponding to the light beams (images) of the respective areas, thereby enabling exact focus detection even in case the images are received in vertically different positions on the sensor.

대표청구항 ▼

1. An auto focusing device in which a first image is entered onto a sensor through a first area of an imaging optical system so as to provide a first image signal corresponding thereto, a second image is entered onto said sensor at a timing different from a timing of entering said first image onto s

1. An auto focusing device in which a first image is entered onto a sensor through a first area of an imaging optical system so as to provide a first image signal corresponding thereto, a second image is entered onto said sensor at a timing different from a timing of entering said first image onto said sensor through a second area of said imaging optical system different from said first area so as to provide a second image signal corresponding thereto, and a phase difference between said first image signal and second image signal is detected so as to obtain information for a focusing operation, wherein said sensor consists of an area sensor including a plurality of pixel lines in which pixels are arranged in a first direction and a plurality of pixel lines in which pixels are arranged in a second direction perpendicular to said first direction, said device comprising:a detecting circuit which detects levels of coincidence of first image signals in predetermined pixel lines with respect to second image signals in said predetermined pixel lines respectively; and a determining circuit which obtains information for focusing operation based on said phase difference between said first image signal and second image signal of which a coincidence level is highest among said level of coincidences detected by said detecting circuit.