Image sensor and image capturing apparatus

An image capturing apparatus comprising:

• the image sensor having a plurality of pixels including focus detection pixels that outputs signals from which a pair of focus detection signals having parallax can be obtained based on light flux passing through different pupil regions of an imaging optical system, each pixel comprising:
• at least one photoelectric conversion unit;
• and
• a microlens optical system provided on a side on which light is incident with respect to the photoelectric conversion unit,
• wherein a shape of a principal curved surface of the microlens optical system is such that a first curvature of the microlens optical system at a first distance from an optical axis of the microlens optical system is larger than a second curvature of the microlens optical system at a second distance which is farther from the optical axis of the microlens optical system than the first distance;
• the imaging optical system;
• and
• a processing unit that processes signals output from the image sensor.

An image capturing apparatus to/from which an imaging optical system can be attached/detached, comprising:

• the image sensor having a plurality of pixels including focus detection pixels that outputs signals from which a pair of focus detection signals having parallax can be obtained based on light flux passing through different pupil regions of an imaging optical system, each pixel comprising:
• at least one photoelectric conversion unit;
• and
• a microlens optical system provided on a side on which light is incident with respect to the photoelectric conversion unit,
• wherein a shape of a principal curved surface of the microlens optical system is such that a first curvature of the microlens optical system at a first distance from an optical axis of the microlens optical system is larger than a second curvature of the microlens optical system at a second distance which is farther from the optical axis of the microlens optical system than the first distance;
• and
• a processing unit that processes signals output from the image sensor.

An image sensor having a plurality of pixels including focus detection pixels that outputs signals from which a pair of focus detection signals having parallax can be obtained based on light flux passing through different pupil regions of an imaging optical system, each pixel comprising:

• at least one photoelectric conversion unit;
• and
• a microlens optical system provided on a side on which light is incident with respect to the photoelectric conversion unit,
• wherein a shape of a principal curved surface of the microlens optical system is such that a first focal point of a circular portion of the microlens optical system with the radius of a first distance from an optical axis of the microlens optical system is located on the side where the light enters with respect to a second focal point of a circular portion of the microlens optical system with the radius of a second distance which is farther from the optical axis of the microlens optical system than the first distance.

An image capturing apparatus comprising:

• the image sensor having a plurality of pixels including focus detection pixels that outputs signals from which a pair of focus detection signals having parallax can be obtained based on light flux passing through different pupil regions of an imaging optical system, each pixel comprising:
• at least one photoelectric conversion unit;
• and
• a microlens optical system provided on a side on which light is incident with respect to the photoelectric conversion unit,
• wherein a shape of a principal curved surface of the microlens optical system is such that a first focal point of a circular portion of the microlens optical system with the radius of a first distance from an optical axis of the microlens optical system is located on the side where the light enters with respect to a second focal point of a circular portion of the microlens optical system with the radius of a second distance which is farther from the optical axis of the microlens optical system than the first distance;
• the imaging optical system;
• and
• a processing unit that processes signals output from the image sensor.

An image capturing apparatus to/from which an imaging optical system can be attached/detached, comprising:

• the image sensor having a plurality of pixels including focus detection pixels that outputs signals from which a pair of focus detection signals having parallax can be obtained based on light flux passing through different pupil regions of an imaging optical system, each pixel comprising:
• at least one photoelectric conversion unit;
• and
• a microlens optical system provided on a side on which light is incident with respect to the photoelectric conversion unit,
• wherein a shape of a principal curved surface of the microlens optical system is such that a first fiscal point of a circular portion of the microlens optical system with the radius of a first distance from an optical axis of the microlens optical system is located on the side where the light enters with respect to a second focal point of a circular portion of the microlens optical system with the radius of a second distance which is farther from the optical axis of the microlens optical system than the first distance;
• and
• a processing unit that processes signals output from the image sensor.