Abstract: A projection lens system projects an image of a reduction side into a magnification side in an image projection device, a back glass being disposed on the reduction side. In the projection lens system, all of one or more negative lenses that satisfy, in a surface on the reduction side or a surface on the magnification side, condition |h/H|<2.0 defined by height h of a most off-axis principal ray and height H of an axial ray passing through a highest pupil position satisfy conditions Tn?98.5% and Dn/Db?0.05 defined by transmittance Tn, thickness Dn of the negative lens on an optical axis, and total thickness Db of the back glass.

Abstract: A projection lens system that projects an image of a reduction side into a magnification side includes a diaphragm, a plurality of positive lenses, and a plurality of negative lenses. The plurality of positive lenses include a first positive lens closer to the magnification side than the diaphragm is and closest to the diaphragm, a second positive lens second closest to the diaphragm after the first positive lens on the magnification side, a third positive lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The plurality of negative lenses include a first negative lens closer to the magnification side than the diaphragm is and closest to the diaphragm, and a second negative lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The lenses have transmittances larger than threshold values, respectively.

Abstract: An optical unit includes first to third prisms. The first prism has a first coated surface configured to reflect illumination light in a first wavelength band, a first surface, and a first light transmitting surface. The second prism has a second coated surface configured to reflect the illumination light in a second wavelength band, a second surface, and a second light transmitting surface. The third prism has a third light transmitting surface, and a fourth light transmitting surface. The first prism is formed with normal lines of the first coated surface, the first surface, and the first light transmitting surface being out of coplanar with each other, and/or the second prism is formed with normal lines of the second coated surface, the second surface, and the second light transmitting surface being out of coplanar with each other.

Abstract: An optical unit includes first to third prisms. The first prism has a first coated surface configured to reflect illumination light in a first wavelength band, a first surface, and a first light transmitting surface. The second prism has a second coated surface configured to reflect the illumination light in a second wavelength band, a second surface, and a second light transmitting surface. The third prism has a third light transmitting surface, and a fourth light transmitting surface. The first prism is formed with normal lines of the first coated surface, the first surface, and the first light transmitting surface being out of coplanar with each other, and/or the second prism is formed with normal lines of the second coated surface, the second surface, and the second light transmitting surface being out of coplanar with each other.

Abstract: A projection lens system that projects an image of a reduction side into a magnification side includes a diaphragm, a plurality of positive lenses, and a plurality of negative lenses. The plurality of positive lenses include a first positive lens closer to the magnification side than the diaphragm is and closest to the diaphragm, a second positive lens second closest to the diaphragm after the first positive lens on the magnification side, a third positive lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The plurality of negative lenses include a first negative lens closer to the magnification side than the diaphragm is and closest to the diaphragm, and a second negative lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The lenses have transmittances larger than the respective lower limit values.

Abstract: A projection lens system projects an image of a reduction side into a magnification side in an image projection device, a back glass being disposed on the reduction side. In the projection lens system, all of one or more negative lenses that satisfy, in a surface on the reduction side or a surface on the magnification side, condition |h/H|<2.0 defined by height h of a most off-axis principal ray and height H of an axial ray passing through a highest pupil position satisfy conditions Tn?98.5% and Dn/Db?0.05 defined by transmittance Tn, thickness Dn of the negative lens on an optical axis, and total thickness Db of the back glass.

Abstract: An image projection device projects an image to a projection surface, and includes an image forming element, a refractive optical unit, and a reflective optical unit. The image forming element forms an image to be projected to the projection surface based on an image signal. The refractive optical unit has a refractive optical system including a plurality of lenses guiding light of the image toward the projection surface, the image being formed by the image forming element. The reflective optical unit includes a reflective optical system having a first mirror reflecting the light guided by the refractive optical system and a second mirror reflecting the light reflected by the first mirror toward the projection surface; and a blocking section including a blocking surface disposed at a position of blocking part of light generated in the refractive optical unit and passing through between the first mirror and the second mirror.

Abstract: An image projection device projects an image to a projection surface, and includes an image forming element, a refractive optical unit, and a reflective optical unit. The image forming element forms an image to be projected to the projection surface based on an image signal. The refractive optical unit has a refractive optical system including a plurality of lenses guiding light of the image toward the projection surface, the image being formed by the image forming element. The reflective optical unit includes a reflective optical system having a first mirror reflecting the light guided by the refractive optical system and a second mirror reflecting the light reflected by the first mirror toward the projection surface; and a blocking section including a blocking surface disposed at a position of blocking part of light generated in the refractive optical unit and passing through between the first mirror and the second mirror.

Abstract: An image processing device performs image processing on image data for projection into a projection area. The image processing device comprises a memory and an image processor. The memory at least temporarily stores image data. The image processor specifies a certain area that is part of the projection area and extends from one end of the projection area, and corrects the image data so as to satisfy a certain condition on the basis of the specification of the certain area. The certain condition is that the correction amount A for the brightness of the image data portion to be projected into the certain area and the correction amount B for the brightness of the other image data portion in the projection area satisfy the relation A<B.

Abstract: A lens barrel includes a fixed frame, an annular operation ring rotatable with respect to the fixed frame, a drive frame rotatable together with the operation ring with respect to the fixed frame, a mobile frame movable together with lens held by the mobile frame along an optical axis direction based on a rotation of the drive frame, a coil array fixed to any one of the fixed frame and the drive frame and composed of a plurality of coils disposed alongside in a circumferential direction, and a magnet array fixed to the other of the fixed frame and the drive frame and composed of a plurality of magnets disposed alongside in the circumferential direction, in which the drive frame is rotated by electromagnetic force generated by supplying a current to the coil array, and the mobile frame is driven along the optical axis direction.

Abstract: A lens barrel: an optical system; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and the macro scale indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation.

Abstract: An image processing device performs image processing on image data for projection into a projection area. The image processing device comprises a memory and an image processor. The memory at least temporarily stores image data. The image processor specifies a certain area that is part of the projection area and extends from one end of the projection area, and corrects the image data so as to satisfy a certain condition on the basis of the specification of the certain area. The certain condition is that the correction amount A for the brightness of the image data portion to be projected into the certain area and the correction amount B for the brightness of the other image data portion in the projection area satisfy the relation A<B.

Abstract: A lens barrel includes a fixed frame, an annular operation ring rotatable with respect to the fixed frame, a drive frame rotatable together with the operation ring with respect to the fixed frame, a mobile frame movable together with lens held by the mobile frame along an optical axis direction based on a rotation of the drive frame, a coil array fixed to any one of the fixed frame and the drive frame and composed of a plurality of coils disposed alongside in a circumferential direction, and a magnet array fixed to the other of the fixed frame and the drive frame and composed of a plurality of magnets disposed alongside in the circumferential direction, in which the drive frame is rotated by electromagnetic force generated by supplying a current to the coil array, and the mobile frame is driven along the optical axis direction.

Abstract: An imaging device comprises an imaging optical system with a plurality of lenses, a focusing manipulation component, an imaging state switching manipulation component, and first, second, third, and fourth restrictors. The focusing manipulation component can be turned to change the focal position formed by the imaging optical system. The imaging state switching manipulation component can be turned to move lenses and switch between the first imaging state and the second imaging state. When the imaging state switching manipulation component is turned, the range over which the focusing manipulation component can be turned is switched from a first range that is restricted by first and second restrictors, to a second range that is restricted by third and fourth restrictors and that is at least partly shifted from the first range.

Abstract: Embodiments of a lens barrel may comprise an imaging optical system with a plurality of lenses, a cylindrical focusing manipulation component, a stationary frame, and a restrictor. The focusing manipulation component changes the focal position of the imaging optical system by turning operation around the optical axis of the imaging optical system and to set the distance up to a second imaging region that is at least partially different from a first imaging region, and to move at least some of the lenses of the imaging optical system to switch between first and second imaging states. The restrictor restricts the rotatable range of the focusing manipulation component. When the focusing manipulation component is turned, its rotatable range is switched from a first rotatable range to a second rotatable range.

Abstract: A lens barrel: an optical system; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and the macro scale indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation.

Abstract: Embodiments of a lens barrel may comprise an imaging optical system with a plurality of lenses, a cylindrical focusing manipulation component, a stationary frame, and a restrictor. The focusing manipulation component changes the focal position of the imaging optical system by turning operation around the optical axis of the imaging optical system and to set the distance up to a second imaging region that is at least partially different from a first imaging region, and to move at least some of the lenses of the imaging optical system to switch between first and second imaging states. The restrictor restricts the rotatable range of the focusing manipulation component. When the focusing manipulation component is turned, its rotatable range is switched from a first rotatable range to a second rotatable range.

Abstract: An imaging device comprises an imaging optical system with a plurality of lenses, a focusing manipulation component, an imaging state switching manipulation component, and first, second, third, and fourth restrictors. The focusing manipulation component can be turned to change the focal position formed by the imaging optical system. The imaging state switching manipulation component can be turned to move lenses and switch between the first imaging state and the second imaging state. When the imaging state switching manipulation component is turned, the range over which the focusing manipulation component can be turned is switched from a first range that is restricted by first and second restrictors, to a second range that is restricted by third and fourth restrictors and that is at least partly shifted from the first range.

Abstract: The lens barrel includes a first lens unit, a second lens unit, and a drive unit. The first lens unit includes a first lens element and a first lens support frame supporting the first lens element. The second lens unit includes a second lens element and a second lens support frame supporting the second lens element. The second lens unit is supported by the first lens unit to be movable in the optical axis direction of the first lens element with respect to the first lens unit. The drive unit is arranged to be used to drive the second lens unit with respect to the first lens unit, and is fixed to the first lens unit. When viewed in the optical axis direction, the drive unit is fixed to the first lens unit so that a first profile line formed by the first lens unit and the drive unit is substantially circular.

Abstract: The lens barrel includes a first lens unit, a second lens unit, and a drive unit. The first lens unit includes a first lens element and a first lens support frame supporting the first lens element. The second lens unit includes a second lens element and a second lens support frame supporting the second lens element. The second lens unit is supported by the first lens unit to be movable in the optical axis direction of the first lens element with respect to the first lens unit. The drive unit is arranged to be used to drive the second lens unit with respect to the first lens unit, and is fixed to the first lens unit. When viewed in the optical axis direction, the drive unit is fixed to the first lens unit so that a first profile line formed by the first lens unit and the drive unit is substantially circular.