Abstract: The imaging apparatus 10 includes the lens 11, the image sensor 12 and the controller 14. A light receiving surface of the image sensor 12 is disposed on a focused position of an object by the lens 11, the object being located at a specific object distance. The controller 14 generates one or more second images from a first image obtained from the image sensor 12, the focus position of the second images being changed to an object distance different from a specific object distance, and determines the presence of foreign matters adhered to the surface on the object side of the lens, on the basis of the focused state of the second image.

Abstract: A camera module includes a first camera and a second camera capable of switching between a first imaging direction and a second imaging direction. The first camera captures images in a first imaging range when the second camera is facing the first imaging direction. The second camera captures images in a second imaging range when facing the first imaging direction. The second camera captures images in a third imaging range when facing the second imaging direction. The overlapping range between the first imaging range and the third imaging range is greater than the overlapping range between the first imaging range and the second imaging range.

Abstract: A camera monitoring system includes a first camera configured to capture an image of an area including a predetermined area on the left side of a vehicle, a second camera configured to capture an image of an area including a predetermined area on the right side of the vehicle and a third camera configured to capture an image of an area including a predetermined area behind the vehicle. The camera monitoring system further includes a monitor configured to display a composite image including a first captured image captured by the first camera, a second captured image captured by the second camera and a third captured image captured by the third camera and an image processor configured to control a layout of the composite image, and change the layout according to at least either the moving body information or the environmental information.

Abstract: The imaging apparatus 10 includes the lens 11, the image sensor 12 and the controller 14. A light receiving surface of the image sensor 12 is disposed on a focused position of an object by the lens 11, the object being located at a specific object distance. The controller 14 generates one or more second images from a first image obtained from the image sensor 12, the focus position of the second images being changed to an object distance different from a specific object distance, and determines the presence of foreign matters adhered to the surface on the object side of the lens, on the basis of the focused state of the second image.

Abstract: A camera module includes a first camera and a second camera capable of switching between a first imaging direction and a second imaging direction. The first camera captures images in a first imaging range when the second camera is facing the first imaging direction. The second camera captures images in a second imaging range when facing the first imaging direction. The second camera captures images in a third imaging range when facing the second imaging direction. The overlapping range between the first imaging range and the third imaging range is greater than the overlapping range between the first imaging range and the second imaging range.

Abstract: A camera monitoring system includes a first camera configured to capture an image of an area including a predetermined area on the left side of a vehicle, a second camera configured to capture an image of an area including a predetermined area on the right side of the vehicle and a third camera configured to capture an image of an area including a predetermined area behind the vehicle. The camera monitoring system further includes a monitor configured to display a composite image including a first captured image captured by the first camera, a second captured image captured by the second camera and a third captured image captured by the third camera and an image processor configured to control a layout of the composite image, and change the layout according to at least either the moving body information or the environmental information.

Abstract: An image pickup lens includes: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having negative refractive power, arranged in order from an object side to an image side, the fourth lens group being configured to travel along an optical axis through focusing operation. In the image pickup lens, following conditional expression (1) is satisfied, f/f4<?0.35??(1) where f is a total focal length of the image pickup lens, and f4 is a focal length of the fourth lens group.

Abstract: A zoom lens includes: first to fourth lens groups having positive, negative, positive, and negative refractive power, respectively. The first to fourth lens groups are arranged in order from the object plane. The fourth lens group is configured of one negative lens or a cemented lens including positive and negative lenses that are arranged in order from object plane and are attached to each other. A magnification-varying operation from wide end to telephoto end causes the first and third lens groups to travel toward the object plane and causes the second and fourth lens groups to travel along an optical axis. A focusing operation causes the fourth lens group to travel along the optical axis. The following conditional expression is satisfied: 0.7<(R4f+R4r)/(R4f?R4r)<5??(1) where R4f and R4r are radiuses of curvature of a most-object-sided and a most-image-sided optical surfaces, respectively, in the fourth lens group.

Abstract: An imaging lens includes: a first lens group; a second lens group having positive refractive power; and a third lens group having negative refractive power, which are arranged in order from an object side, wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group, and wherein, when focusing is performed, the second lens group is moved in the optical axis direction.

Abstract: A zoom lens includes: first, second, third and fourth lens groups having negative power, positive power, negative power and positive power, respectively, and sequentially arranged from an object side toward an image side. When the magnification at a wide angle side is changed to the magnification at a telescopic side, the first lens group is so moved along an optical axis that the distance between the first lens group and the second lens group decreases, and the second third and fourth lens groups are moved from the image side toward the object side, the third lens group is moved along the optical axis for focusing, and the zoom lens satisfies the following conditional expression (1) ?2.0<f3/?(fw×ft)<?0.3??(1) where f3, fw and ft represent the focal lengths of the third lens group, the entire lens system at the wide angle end, and the entire lens system at the telescopic end, respectively.

Abstract: Provided is an imaging lens including a fixed first lens group having a positive refractive power and including a plurality of lenses, a second lens group serving as a focus group and including a negative lens, and a third lens group having a positive refractive power that are arranged sequentially from an object side to an image side. A stop is disposed between predetermined lenses of the first lens group, and, on an assumption that a lens group located closer to the object side than the stop of the first lens group is a 1ath lens group and a lens group located closer to the image side than the stop is a 1bth lens group, Condition Equation (1) below is satisfied: 0.7<f/f1b<2.0,??(1) where f is a focal distance of an entire system and f1b is a focal distance of the 1bth lens group.

Abstract: An image pickup lens includes: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having negative refractive power, arranged in order from an object side to an image side, the fourth lens group being configured to travel along an optical axis through focusing operation. In the image pickup lens, following conditional expression (1) is satisfied, f/f4<?0.35??(1) where f is a total focal length of the image pickup lens, and f4 is a focal length of the fourth lens group.

Abstract: Provided is an imaging lens including a fixed first lens group having a negative refractive power, a second lens group having a positive refractive power, a stop, a third lens group including a cemented lens, a fourth lens group including a positive lens, a fifth lens group serving as a focus group and including a negative lens, and a sixth lens group including a positive lens that are arranged sequentially from an object side to an image side.

Abstract: A zoom lens includes: first to fourth lens groups having positive, negative, positive, and negative refractive power, respectively. The first to fourth lens groups are arranged in order from the object plane. The fourth lens group is configured of one negative lens or a cemented lens including positive and negative lenses that are arranged in order from object plane and are attached to each other. A magnification-varying operation from wide end to telephoto end causes the first and third lens groups to travel toward the object plane and causes the second and fourth lens groups to travel along an optical axis. A focusing operation causes the fourth lens group to travel along the optical axis. The following conditional expression is satisfied: 0.7<(R4f+R4r)/(R4f?R4r)<5??(1) where R4f and R4r are radiuses of curvature of a most-object-sided and a most-image-sided optical surfaces, respectively, in the fourth lens group.

Abstract: A zoom lens includes: first, second, third and fourth lens groups having negative power, positive power, negative power and positive power, respectively, and sequentially arranged from an object side toward an image side. When the magnification at a wide angle side is changed to the magnification at a telescopic side, the first lens group is so moved along an optical axis that the distance between the first lens group and the second lens group decreases, and the second third and fourth lens groups are moved from the image side toward the object side, the third lens group is moved along the optical axis for focusing, and the zoom lens satisfies the following conditional expression (1) ?2.0<f3/?(fw×ft)??0.3 ??(1) where f3, fw and ft represent the focal lengths of the third lens group, the entire lens system at the wide angle end, and the entire lens system at the telescopic end, respectively.

Abstract: Provided is an imaging lens including a fixed first lens group having a negative refractive power, a second lens group having a positive refractive power, a stop, a third lens group including a cemented lens, a fourth lens group including a positive lens, a fifth lens group serving as a focus group and including a negative lens, and a sixth lens group including a positive lens that are arranged sequentially from an object side to an image side.

Abstract: Provided is an imaging lens including a fixed first lens group having a positive refractive power and including a plurality of lenses, a second lens group serving as a focus group and including a negative lens, and a third lens group having a positive refractive power that are arranged sequentially from an object side to an image side. A stop is disposed between predetermined lenses of the first lens group, and, on an assumption that a lens group located closer to the object side than the stop of the first lens group is a 1ath lens group and a lens group located closer to the image side than the stop is a 1bth lens group, Condition Equation (1) below is satisfied: 0.7<f/f1b<2.0,??(1) where f is a focal distance of an entire system and f1b is a focal distance of the 1bth lens group.

Abstract: An imaging lens includes: a first lens group; a second lens group having positive refractive power; and a third lens group having negative refractive power, which are arranged in order from an object side, wherein the first lens group includes a former lens group having a negative lens in a most object side, a diaphragm, and a rear lens group, and wherein, when focusing is performed, the second lens group is moved in the optical axis direction.

Abstract: There is a need for providing a projection optical system that is appropriate for maintaining high resolution with low distortion, miniaturizing a reflector, decreasing the number of reflectors, and decreasing the depth and the bottom (or top) of a display used for a rear projection television, for example. The projection optical system according to the invention enlarges and projects images from a primary image surface existing at a reducing side to a secondary image surface existing at an enlarging side. The projection optical system has a first optical system L11 and a second optical system L12. The first optical system L11 forms an intermediate image (position II) of the primary image surface. The second optical system L12 has a concave reflector AM1 that forms the secondary image surface resulting from the intermediate image. A light beam travels from the center of the primary image surface and to the center of the secondary image surface and crosses an optical axis.

Abstract: There is a need for providing a projection optical system that is appropriate for maintaining high resolution with low distortion, miniaturizing a reflector, decreasing the number of reflectors, and decreasing the depth and the bottom (or top) of a display used for a rear projection television, for example. The projection optical system according to the invention enlarges and projects images from a primary image surface existing at a reducing side to a secondary image surface existing at an enlarging side. The projection optical system has a first optical system L11 and a second optical system L12. The first optical system L11 forms an intermediate image (position II) of the primary image surface. The second optical system L12 has a concave reflector AM1 that forms the secondary image surface resulting from the intermediate image. A light beam travels from the center of the primary image surface and to the center of the secondary image surface and crosses an optical axis.