Image pickup apparatus

摘要

An image pickup apparatus, including: a filter including transmittance variable element and adjusting amount of incident light from lens; a photoelectric transducer; and guide optical system guiding the incident light from the filter to the photoelectric transducer. The guide optical system includes color separation optical system including, in order from object side, first prism having first dichroic film, second prism having second dichroic film, and third prism, to separate the incident light into red, green, and blue. The first or second dichroic film is blue reflection dichroic film. Rotational position of the transmittance variable element about optical axis is such a position that ratio of transmittance for blue to transmittance for green of marginal ray entering the blue reflection dichroic film at incident angle smaller than principal ray of axial ray to the blue reflection dichroic film is smaller than such ratio of the principal ray of axial ray.

主权项

1. An image pickup apparatus, comprising:
a filter unit configured to adjust a light amount of incident light from an image pickup optical system; a photoelectric transducer configured to perform photoelectric conversion of the incident light from the filter unit; and a light guide optical system configured to guide the incident light from the filter unit to the photoelectric transducer, wherein: the filter unit comprises a transmittance variable element configured to adjust a transmittance of the incident light; the light guide optical system comprises a color separation optical system comprising, in order from an object side, a first prism provided with a first dichroic film, a second prism provided with a second dichroic film, and a third prism, so as to separate the incident light into red color light, green color light, and blue color light to exit; one of the first dichroic film and the second dichroic film is a blue reflection dichroic film having a characteristic of reflecting the blue color light; and a rotational position of the transmittance variable element about an optical axis is such a position that a ratio of a transmittance for the blue color light to a transmittance for the green color light of a marginal ray entering the blue reflection dichroic film at an incident angle smaller than an incident angle of a principal ray of an axial ray to the blue reflection dichroic film is smaller than a ratio of the transmittance for the blue color light to the transmittance for the green color light of the principal ray of the axial ray.