Abstract: An imaging device includes a free-form lens having a shape in which (i) in a long-side direction of an imaging element, a resolution that changes along an optical axis long-side resolution curve, and the resolution that changes along a distant point long-side resolution curve in a position away from an optical axis, (ii) in a short-side direction, the resolution that changes along an optical axis short-side resolution curve, and the resolution that changes along a distant point short-side resolution curve in the position away from the optical axis, (iii) the distant point long-side resolution curve follows a shape of the optical axis long-side resolution curve, and has a higher resolution than the optical axis long-side resolution curve, and (iv) the distant point short-side resolution curve follows a shape of the optical axis short-side resolution curve, and has a higher resolution than the optical axis short-side resolution curve.

Abstract: A lens system is configured to form an image on an imaging element having a quadrilateral shape disposed on an optical axis, and includes a first free-curved lens being asymmetrical with respect to the optical axis. A free-curved surface of the first free-curved lens has negative refractive power at an intersection point between a circle separated from the optical axis by a length having a predetermined ratio with respect to a minimum image height and a first surface passing through the optical axis and parallel to longer sides of the imaging element, and positive refractive power at an intersection point between a circle separated from the optical axis by a length having the predetermined ratio with respect to the minimum image height and a second surface passing through the optical axis and parallel to shorter sides of the imaging element. The predetermined ratio ranges from 40% to 80% inclusive.

Abstract: An imaging device includes an image sensor and an optical system. An imaging surface of the image sensor includes a first region including an intersection with an optical axis and a second region different from the first region. The optical system forms a subject image on the imaging surface so as to cause resolution of the first region to be higher than resolution of the second region. A relationship between a vertical view angle and resolution is different from a relationship between a horizontal view angle and resolution in the subject image.

Abstract: A lens system is configured to form an image on an imaging element having a quadrilateral shape disposed on an optical axis, and includes a first free-curved lens being asymmetrical with respect to the optical axis. A free-curved surface of the first free-curved lens has positive refractive power at an intersection point between a circle separated from the optical axis by a length having a predetermined ratio with respect to a minimum image height and a first surface passing through the optical axis and parallel to longer sides of the imaging element, and negative refractive power at an intersection point between a circle separated from the optical axis by a length having the predetermined ratio with respect to the minimum image height and a second surface passing through the optical axis and parallel to shorter sides of the imaging element.

Abstract: A lens system forms an image on an imaging element having a quadrilateral shape disposed on an optical axis. The lens system includes a second free-curved lens being asymmetrical with respect to the optical axis. A sag amount of the second free-curved lens in a circle separated from the optical axis by a length having a predetermined ratio with respect to a minimum image height has extrema outside of a first intersection points between a first surface passing through the optical axis and parallel to longer sides of the imaging element and the circle, and a second intersection point between a second surface passing through the optical axis and parallel to shorter sides of the imaging element and the circle. Each of the extrema is greater than the sag amount at the first intersection point or the second intersection point by 0.01 mm or greater.

Abstract: A lens system includes, in order from an object side to an image plane side: a first lens element having a negative power; a second lens element whose concave surface faces the object side; and a third lens element having a positive power, and satisfies conditions (1) and (2). 0.205<|(TL1/TA)·tan(?)|??(1) 0.120<IH/TA<0.170??(2) where TL1 is a central thickness of the first lens element, TA is a total optical length, ? is a half angle of view, and IH is an image height of the lens system.

Abstract: An object of the present disclosure is to increase resolution of a part required for sensing while achieving a wide view angle. An imaging device according to the present disclosure includes an image sensor and an optical system. An imaging surface of the image sensor includes a first region and a second region different from the first region. The optical system forms a subject image on the imaging surface so as to cause resolution of an image in the first region to be higher than resolution of an image in the second region. The first region is arranged so as to include a region where an image of a person's face is formed on the imaging surface.

Abstract: Imaging system (70) disposed at a rear part of moving body (100) includes imaging device (10) and image processing device (20). Imaging device (10) includes an imaging element and an optical system. The imaging element has a plurality of pixels arranged in a two-dimensional manner and generates image data. The optical system forms a subject image on an imaging surface of the imaging element. Image processing device (20) generates a captured image based on the image data. The imaging surface includes a first region corresponding to a first view angle and a second region corresponding to a second view angle that is larger than the first view angle. The optical system is configured so that resolution of the first region is higher than resolution of the second region excluding the first region. A center of the first region is disposed at a position deviated from a center of the imaging surface.

Abstract: An imaging device having an optical system including a free-form surface lens with rotationally asymmetric shape that forms an image on an imaging surface such that a resolution of a first region in front of the predetermined region is higher than a resolution of a second region at a lateral side of the predetermined region. The free-form surface lens has a shape that forms the image such that a resolution of a portion at a predetermined first distance away from a center of the first region in a vertical direction is different from a resolution of a portion at the predetermined first distance away from the center of the first region in a horizontal direction, the vertical direction being orthogonal to the horizontal direction, in the imaging element, in which the first region and the second region are aligned.

Abstract: An imaging apparatus is attached to a side of a moving body (for example, vehicle). The imaging apparatus includes an image sensor and an optical system that forms a subject image in a range of a predetermined vertical view angle and a predetermined horizontal view angle on an imaging surface. The optical system forms an image on the imaging surface so as to cause resolution in first region (R1) of the imaging surface to be higher than resolution in second region (R2) different from the first region. A position of center (G1) of first region (R1) is at least one of a position horizontally shifted from a center of the horizontal view angle and a position vertically shifted from a center of the vertical view angle.

Abstract: A distance measurement system includes: an imaging device including an imaging element where a plurality of imaging pixels are arranged in matrix, and an optical system forming an image of a predetermined region on an imaging surface of the imaging element; and a distance measurer determining a distance to a target object based on data of the image obtained from the imaging element, wherein the optical system includes a free-form surface lens having a rotationally asymmetric shape that forms the image on the imaging surface such that a resolution of a first region in front of the region is higher than that of a second region at a lateral side of the region, each of the resolutions being a ratio of the number of ones of the imaging pixels used to pick up an image included in per unit angle of view to a total number of the imaging pixels.

Abstract: An object of the present disclosure is to increase resolution of a part required for sensing while achieving a wide view angle. An imaging device according to the present disclosure includes an image sensor and an optical system. An imaging surface of the image sensor includes a first region and a second region different from the first region. The optical system forms a subject image on the imaging surface so as to cause resolution of an image in the first region to be higher than resolution of an image in the second region. The first region is arranged so as to include a region where an image of a person's face is formed on the imaging surface.

Abstract: An imaging device includes an image sensor and an optical system. An imaging surface of the image sensor includes a first region including an intersection with an optical axis and a second region different from the first region. The optical system forms a subject image on the imaging surface so as to cause resolution of the first region to be higher than resolution of the second region. A relationship between a vertical view angle and resolution is different from a relationship between a horizontal view angle and resolution in the subject image.

Abstract: A head-mounted display device includes a first display portion disposed in front of a pupil of a viewer and displaying a first image, a second display portion disposed on an ear side of the viewer and diagonally in front of the pupil and displaying a second image, a first lens disposed between the pupil and the first display portion for projecting a first image onto the pupil, and a second lens disposed between the pupil and the second display portion for projecting a second image onto the pupil. The second lens is disposed adjacent to the first lens on the ear side of the viewer, and an optical axis of the first lens and an optical axis of the second lens intersect with each other at an angle ranging from 30 degrees to 80 degrees inclusive.

Abstract: An imaging system includes first imaging device (10a) and second imaging device (10b). First imaging device (10a) includes a first optical system having a first view angle, and a first imaging element. Second imaging device (10b) includes a second optical system having a second view angle that is wider than the first view angle, and a second imaging element. The second optical system is configured to form an image including a first region and a second region, which do not overlap each other, such that a resolution in the second region is higher than a resolution in the first region corresponding to an imaging range of the first view angle, in an imaging surface of a subject image.

Abstract: Imaging system (70) disposed at a rear part of moving body (100) includes imaging device (10) and image processing device (20). Imaging device (10) includes an imaging element and an optical system. The imaging element has a plurality of pixels arranged in a two-dimensional manner and generates image data. The optical system forms a subject image on an imaging surface of the imaging element. Image processing device (20) generates a captured image based on the image data. The imaging surface includes a first region corresponding to a first view angle and a second region corresponding to a second view angle that is larger than the first view angle. The optical system is configured so that resolution of the first region is higher than resolution of the second region excluding the first region. A center of the first region is disposed at a position deviated from a center of the imaging surface.

Abstract: A lens system, an interchangeable lens apparatus, and a camera system each include a front group including a first focus lens group that moves with respect to an image surface in focusing from an infinity in-focus condition to a close-object in-focus condition; a rear group including a second focus lens group that moves with respect to the image surface in focusing, the front group and the rear group being located in order from an object side to an image side; a fixed lens group including at least one positive power lens element, the fixed lens group being located between the front group and the rear group and fixed with respect to the image surface in focusing; and an aperture diaphragm. The positive power lens in the fixed lens group satisfies dPgF>0.015 (dPgF is an anomalous dispersibility in a g-line and an F-line of the lens element).

Abstract: An imaging system includes: a first imaging apparatus including a first imaging element and a first optical system; and a generator that generates an image based on image data acquired from the first imaging element. The first optical system includes a first free-form surface lens that has a shape that allows an image to be formed on the first imaging element such that a resolution is different between a portion of a predetermined region and another portion of the predetermined region, the resolution being defined as a total number of imaging pixels that capture an image within a unit field angle on a horizontal plane.

Abstract: A shake correction method for a camera satisfies 1<f tan ?/Y and includes, when recording an image: driving, by a first shake corrector, a shake correction lens group so that a movement amount thereof with respect to a rotational shake around an axis passing through the optical axis and parallel to a short side of the image is larger than that with respect to a rotational shake around an axis passing through the optical axis and parallel to a long side of the image; and driving, by a second shake corrector, an imaging element so that a movement amount thereof with respect to the rotational shake around the axis passing through the optical axis and parallel to the short side of the image is smaller than that with respect to the rotational shake around the axis passing through the optical axis and parallel to the long side of the image.

Abstract: A distance measurement system includes: an imaging device including an imaging element where a plurality of imaging pixels are arranged in matrix, and an optical system forming an image of a predetermined region on an imaging surface of the imaging element; and a distance measurer determining a distance to a target object based on data of the image obtained from the imaging element, wherein the optical system includes a free-form surface lens having a rotationally asymmetric shape that forms the image on the imaging surface such that a resolution of a first region in front of the region is higher than that of a second region at a lateral side of the region, each of the resolutions being a ratio of the number of ones of the imaging pixels used to pick up an image included in per unit angle of view to a total number of the imaging pixels.