Abstract: A lens system provides to a user, a high-definition image in which generation of concentric circles is reduced. The lens system has one or more Fresnel lenses. A lens surface of each of the Fresnel lenses has a plurality of grooves that is concentrically formed. Both a pitch which is the distance between two adjacent grooves and the depth of each of the plurality of grooves vary with the distance from an optical axis that passes through the center of the lens system.

Abstract: Proposed is a lens system capable of providing, to a user, a high-definition image in which generation of concentric circles is reduced. The lens system has one or more Fresnel lenses. A lens surface of each of the Fresnel lenses has a plurality of grooves that is concentrically formed. Both a pitch which is the distance between two adjacent grooves and the depth of each of the plurality of grooves vary with the distance from an optical axis that passes through the center of the lens system.

Abstract: Proposed is a lens system capable of providing, to a user, a high-definition image in which generation of concentric circles is reduced. The lens system has one or more Fresnel lenses. A lens surface of each of the Fresnel lenses has a plurality of grooves that is concentrically formed. Both a pitch which is the distance between two adjacent grooves and the depth of each of the plurality of grooves vary with the distance from an optical axis that passes through the center of the lens system.

Abstract: In a display apparatus body (10A), a first polarization plate (31), a first wave plate (32), a reflection layer (33), a second wave plate (35), and a second polarization plate (36) are arranged between a display element (De) and a lens (S) and are lined up in this order from the display element (De) toward the lens (S). Further, the reflection layer (33) includes reflection regions (E1) that correspond to positions of non-light emission regions (R2) of the display element (De) and that reflect light and includes light transmission regions (E2) that correspond to positions of a plurality of light emission regions (R1) and that transmit light. This can obtain a display apparatus that can improve the use efficiency of light emitted from a display element.

Abstract: A lens unit includes a first lens and a second lens. The first lens is a Fresnel lens that has a first lens surface having a Fresnel structure on the second lens side, and has a positive refractive power. The second lens is a Fresnel lens that has a second lens surface having a Fresnel structure on the first lens side, and has a positive refractive power.

Abstract: Provided is a display device in which generation of a ghost can be restrained. A polarizing plate is disposed adjacently to a display section. A ¼ wavelength plate is disposed adjacently to the polarizing plate. A polarizing plate is disposed adjacently to a lens. A ¼ wavelength plate is disposed adjacently to the polarizing plate. A beam splitter is disposed between the ¼ wavelength plate and the ¼ wavelength plate. The beam splitter is disposed at such a position that the air-equivalent optical path length of light that is reflected by the polarizing plate and is thereafter reflected by the beam splitter from emission of the light from the display section to transmission of the light through the lens and the air-equivalent optical path length of light that is reflected by the beam splitter and is thereafter reflected by the polarizing plate from emission of the light from the display section to transmission of the light through the lens are equal.

Abstract: Provided is a display device in which generation of a ghost can be restrained. A polarizing plate is disposed adjacently to a display section. A ¼ wavelength plate is disposed adjacently to the polarizing plate. A polarizing plate is disposed adjacently to a lens. A ¼ wavelength plate is disposed adjacently to the polarizing plate. A beam splitter is disposed between the ¼ wavelength plate and the ¼ wavelength plate. The beam splitter is disposed at such a position that the air-equivalent optical path length of light that is reflected by the polarizing plate and is thereafter reflected by the beam splitter from emission of the light from the display section to transmission of the light through the lens and the air-equivalent optical path length of light that is reflected by the beam splitter and is thereafter reflected by the polarizing plate from emission of the light from the display section to transmission of the light through the lens are equal.

Abstract: A filter control device of the present disclosure includes a filter controller that performs control to cause low-pass characteristics of an optical low-pass filter mounted in an imaging device to be changed in accordance with change in an image shooting range.

Abstract: A filter control device of the present disclosure includes a filter controller that performs control to cause low-pass characteristics of an optical low-pass filter mounted in an imaging device to be changed in accordance with change in an image shooting range.

Abstract: A filter control device of the present disclosure includes a filter controller that performs control on a shot image to cause low-pass characteristics of an optical low-pass filter mounted in an imaging device to be changed in accordance with a magnification of the image, the magnification to be changed by image processing.

Abstract: Provided is an imaging apparatus including a ranging area selection unit configured to select an area for measuring a distance to an object to be photographed from a plurality of candidate areas preset in an area according to an angle of view of a photographing lens, the area being selected as a ranging area, an irradiation unit configured to irradiate auxiliary light onto the object to be photographed, a distance to the object to be photographed being measured in the ranging area, and a ranging unit configured to measure the distance to the object to be photographed, to which the auxiliary light has been irradiated, in the ranging area.

Abstract: An optical function device includes a base material layer, a semi-transparent layer formed on a principal plane of the base material layer, the semi-transparent layer reflecting light of incident light at a ratio determined in advance and passing remaining light; and a reflection prevention layer formed on a principal plane opposite to the principal plane of the base material layer with respect to the base material layer, the reflection prevention layer preventing reflection of the light passing through the base material layer. The image-capturing device includes an optical function device, a first light receiving device for receiving transmission light from the optical function device, and a second light receiving device for receiving reflection light from the optical function device.

Abstract: An image pickup element includes a light-receiving portion having a matrix arrangement formed by disposing first-direction arrays, each having photoelectric conversion portions arranged in a first direction with a predetermined gap maintained therebetween, in a second direction orthogonal to the first direction, and micro-lenses provided above the light-receiving portion. A certain first-direction array in the matrix arrangement is provided with a pair of photoelectric conversion portions that optically receive, via a pair of micro-lenses, photographic-subject light beams passing through a pair of segmental regions in an exit pupil of a photographic optical system, the pair of segmental regions being disposed biasedly in opposite directions from each other in the first direction. The pair of micro-lenses is disposed such that light axes thereof extend through vicinities of edges of the pair of photoelectric conversion portions, the edges being the farthest edges from each other in the first direction.

Abstract: An image pickup apparatus including: an image pickup device for receiving subject light passed through a photographing optical system by an image pickup surface in which a pixel arrangement is formed, and generating an image signal; and an optically transparent film having an optical anisotropy, and disposed in front of the image pickup surface, the subject light entering the optically transparent film; wherein a width of separation between a first ray of light and a second ray of light produced by birefringence in the optically transparent film is ½ or more of a pixel pitch in the pixel arrangement.

Abstract: An optical function device includes a base material layer, a semi-transparent layer formed on a principal plane of the base material layer, the semi-transparent layer reflecting light of incident light at a ratio determined in advance and passing remaining light; and a reflection prevention layer formed on a principal plane opposite to the principal plane of the base material layer with respect to the base material layer, the reflection prevention layer preventing reflection of the light passing through the base material layer. The image-capturing device includes an optical function device, a first light receiving device for receiving transmission light from the optical function device, and a second light receiving device for receiving reflection light from the optical function device.

Abstract: Provided is an imaging apparatus including a ranging area selection unit configured to select an area for measuring a distance to an object to be photographed from a plurality of candidate areas preset in an area according to an angle of view of a photographing lens, the area being selected as a ranging area, an irradiation unit configured to irradiate auxiliary light onto the object to be photographed, a distance to the object to be photographed being measured in the ranging area, and a ranging unit configured to measure the distance to the object to be photographed, to which the auxiliary light has been irradiated, in the ranging area.

Abstract: An imaging apparatus includes a half mirror that splits light from a subject having passed through a photographic optical system into transmitted light and reflected light, a first light receiving sensor that receives the transmitted light, the first light receiving sensor having a spectral sensitivity characteristic with a sensitivity peak at a specific wavelength of light, and a second light receiving sensor that receives the reflected light. The wavelength of a transmission peak in the spectral transmission characteristic of the half mirror matches the wavelength of the sensitivity peak of the first light receiving sensor.

Abstract: An imaging apparatus includes a light beam division element for dividing an incident light beam into first and second light beams, a light reception unit on which the first beam is incident, for acquiring an intensity of a P or S-polarized component for the first beam, an irradiated body on which the second beam is incident, a signal processing unit for outputting a predicted value of an intensity of a P or S-polarized component for the second beam from the intensity of the P or S component acquired by the light reception unit, a shutter for switching incidence and blocking of the second beam on and to the body, and an iris for adjusting an amount of the second beam reaching the body. At least one of a speed of the shutter or an opening of the iris is adjusted according to an output from the processing unit.

Abstract: A phase-difference detecting image pickup element performs focus detection even if the position of an exit pupil with respect to the image pickup element changes. A pixel pair receives an object light beam transmitted through a pair of portion areas whose areas become the same in an exit pupil at a particular distance from the image pickup element. The pixel pair includes light-intercepting portions that define the pair of portion areas. A different pixel pair whose light-intercepting portions are different so that the areas of the pair of portion areas in the exit pupil the particular distance from the image pickup element are the same. By this, even if the position of the exit pupil is changed by, for example, a lens replacement, focus detection can be performed by a phase-difference detection method by selecting a pixel pair in accordance with the position of the exit pupil.

Abstract: An image pickup apparatus includes a light-beam splitting mirror configured to transmit and reflect incident light that has entered the light-beam splitting mirror through a photographing optical system; an image sensor that receives light transmitted through the light-beam splitting mirror; an autofocus detecting unit that receives light reflected by the light-beam splitting mirror; a signal processing unit configured to process an image pickup signal of the image sensor; and a display unit configured to display an image being photographed, on the basis of an image signal obtained at the signal processing unit. In the image pickup apparatus, the light-beam splitting mirror has spectral characteristics including a reflectivity of 25% or more and 35% or less at a wavelength of 400 to 650 nm and a reflectivity of 60% or more at a wavelength of about 700 nm through optimization.