Focal point adjustment device, camera system, and focal point adjustment method for imaging device

A camera system comprising an interchangeable lens having a photographic optical system and a camera main body in which the interchangeable lens can be mounted,

• the interchangeable lens including a memory to store a correction value for focal point adjustment, depending on an image height position of an imaging region in an image sensor and to output the correction value to the camera main body, and
• the camera main body including:
• the image sensor having an imaging pixel which receives a light flux having passed through the photographic optical system and performs photoelectric conversion to output an image signal, and a focal point detection pixel;
• a calculation section to calculate a focal point adjustment signal, based on an output of the focal point detection pixel;
• a camera-shake preventing section which moves the image sensor in a direction perpendicular to an optical axis of the photographic optical system to correct camera shake and also outputs information on the movement of the image sensor;
• and
• a correction section to correct the focal point adjustment signal, depending on the correction value output by the memory, the information output by the camera-shake preventing section on the movement, and a position of the focal point detection pixel, wherein
• the correction value is information indicating a ratio of an image plane movement amount at the image height position with respect to a unit image plane movement amount on the optical axis of the photographic optical system, and
• the correction section corrects the focal point adjustment signal, based on the correction value corresponding to the image height position of the focal point detection pixel and the information output by the camera-shake preventing section on the movement of the image sensor.

A camera system comprising an interchangeable lens having a photographic optical system and a camera main body in which the interchangeable lens can be mounted,

• the interchangeable lens including:
• a memory to store a correction value for focal point adjustment, depending on an image height position of an imaging region in an image sensor and to output the correction value to the camera main body;
• and
• a camera-shake preventing section which moves a part of the photographic optical system in a direction perpendicular to an optical axis to correct camera shake and also outputs information on the movement of the part of the photographic optical system, and
• the camera main body including:
• an image sensor having an imaging pixel which receives a light flux having passed through the photographic optical system and performs photoelectric conversion to output an image signal, and a focal point detection pixel;
• a calculation section to calculate a focal point adjustment signal, based on an output of the focal point detection pixel;
• and
• a correction section to correct the focal point adjustment signal, depending on the correction value output by the memory, the information output by the camera-shake preventing section on the movement, and a position of the focal point detection pixel, wherein
• the correction value is information indicating a ratio of an image plane movement amount at the image height position with respect to a unit image plane movement amount on the optical axis of the photographic optical system, and
• the correction section corrects the focal point adjustment signal, based on the correction value corresponding to the image height position of the focal point detection pixel and the information output by the camera-shake preventing section on the movement of the part of the photographic optical system.

A focal point adjustment method of an imaging device including an image sensor having an imaging pixel which receives a light flux having passed through a photographic lens and performs photoelectric conversion to output an image signal, and a focal point detection pixel, and a camera-shake preventing section which moves the image sensor in a direction perpendicular to an optical axis of the photographic lens to correct camera shake and also outputs information on the movement of the image sensor, the focal point adjustment method comprising:

• setting a focal point detection region for the image sensor;
• generating a focal point adjustment signal, based on outputs from a plurality of focal point detection pixels included in the focal point detection region;
• and
• correcting the focal point adjustment signal, depending on the information output by the camera-shake preventing section and a position of the focal point detection region, wherein
• the correction value is information indicating a ratio of an image plane movement amount at the image height position with respect to a unit image plane movement amount on the optical axis of the photographic lens, and
• the focal point adjustment signal is corrected, based on the correction value corresponding to the image height position of the focal point detection pixel and the information output by the camera-shake preventing section on the movement of the image sensor.

A focal point adjustment method of an imaging device including an image sensor having an imaging pixel which receives a light flux having passed through a photographic lens and performs photoelectric conversion to output an image signal, and a focal point detection pixel, and a camera-shake preventing section which moves a lens section included in the photographic lens in a direction perpendicular to an optical axis of the photographic lens to correct camera shake and also outputs information on the movement of the lens section, the focal point adjustment method comprising:

• setting a focal point detection region for the image sensor,
• generating a focal point adjustment signal, based on outputs from a plurality of focal point detection pixels included in the focal point detection region:
• and
• correcting the focal point adjustment signal, depending on the information output by the camera-shake preventing section and a position of the focal point detection region, wherein
• the correction value is information indicating a ratio of an image plane movement amount at the image height position with respect to a unit image plane movement amount on the optical axis of the photographic lens, and
• the focal point adjustment signal is corrected, based on the correction value corresponding to the image height position of the focal point detection pixel and the information output by the camera-shake preventing section on the movement of the lens section.