COLOR SEPARATION OPTICAL ASSEMBLY AND IMAGE CAPTURE DEVICE

摘要

A color separation optical assembly (3) of an image capture device (1) includes, in order from a light incidence side, a first prism (10) which has a first dichroic film (D1) and extracts blue light (LB) reflected by the first dichroic film, a second prism (20) which has a second dichroic film (D2) and extracts red light (LR) transmitted through the first dichroic film and reflected by the second dichroic film, and a third prism (30) which extracts green light (LG) transmitted through the first and second dichroic films. The first dichroic film is a multiband dichroic film which reflects light of an infrared region from a long wavelength side of a red region.

主权项

1. A color separation optical assembly which separates incident light into at least three color light components of blue light, red light, and green light, the color separation optical assembly comprising, in order from a light incidence side:
a first prism which has a first dichroic film and extracts a first color light component reflected by the first dichroic film; a second prism which has a second dichroic film and extracts a second color light component transmitted through the first dichroic film and reflected by the second dichroic film; and a third prism which extracts a third color light component transmitted through the first and second dichroic films, wherein red light is extracted from the second prism as the second color light component or is extracted from the third prism as the third color light component, the dichroic film of at least one prism arranged closer to the light incidence side than the prism extracting red light out of the first and second prisms is a multiband dichroic film which reflects light of an infrared region from a long wavelength side of a red region, and the color separation optical assembly further comprises: a trimming filter which cuts light of the infrared region from the long wavelength side of the red region from light emitted from the prism having the multiband dichroic film.