5 results about "Light flux" patented technology

An imaging apparatus includes: a zoom lens system including a plurality of groups and performing variable magnification by changing intervals of the lens groups; a color-separation optical system configured to carry out color separation of a light flux from the zoom lens system; and a plurality of imaging devices configured to convert optical images separated by colors by the color-separation optical system into electric signals. The zoom lens system includes at least one reflection member configured to bend an optical axis by 90 degrees or approximately 90 degrees. The color-separation optical system is arranged such that color-separation is performed in a direction within a plane perpendicular to another plane formed by an optical axis for light incident to the zoom lens system and an optical axis for light reflected by the reflection member.

This invention provides an optical device capable of efficiently cooling an optical modulator and preventing deterioration of an optical image formed by the optical modulator. In the optical device equipped with an optical modulation device having the optical modulator which modulates light fluxes emitted from a light source according to image information and forms the optical image, openings according to an image formation area of the optical modulator and a holding frame which holds the optical modulator, the openings according to the image formation area of the optical modulation device are formed, a container-like cooling medium encapsulation part in which a cooling medium which cools the optical modulator is encapsulated is provided on the light flux incident side and/or the light flux emitting side of the optical modulation device, the cooling medium encapsulation part is provided with a first cooling chamber which performs sealing encapsulation of the cooling medium in a space including the openings and a second cooling chamber which is formed by being demarcated from the first cooling chamber, guides and circulates other cooling medium from the outside of the cooling medium encapsulation part at a position avoiding the openings.

A ranging apparatus includes: a first calculation unit configured to calculate an image shift amount between a first image and a second image, the first image being based on a first signal which corresponds to a light flux transmitted through a first pupil area of an imaging optical system, and the second image being based on a second signal which corresponds to a light flux transmitted through a second pupil area of the imaging optical system; and a second calculation unit configured to calculate a defocus amount from the image shift amount, using a conversion coefficient based on a received light quantity distribution in accordance with the position of the ranging pixel.