Fuji Photo Optical Co., Ltd.

Toshiro Yamauchi

Takemi Saito

Shigehiro Kanayama

Kunio Ando

Haruo Kakizawa

Seiji Toyama

A color separation optical system for a color television camera of relay lens type in which a set of color separating optical elements are provided between a single first relay lens and three second relay lenses for three primary colors. The first relay lens is located substantially on the image plane of the taking lens of the television camera. A field lens is provided between the taking lens and the first relay lens. The power of the field lens is determined according to the focal length of the taking lens. The field lens is removed when the exit pupil of the taking lens is registered with the entrance pupil of the first relay lens. In this case, the first relay lens is axially moved toward the taking lens to make the front focal plane of the first relay lens registered with the image plane of the taking lens. The axial movement of the first relay lens is conducted by means of a mechanism which is operable from outside of the television camera.

Optical color-separation system for use in a color television camera

In a color television camera, a color separation optical system includes a first relay lens behind a taking lens of the camera, color separation optical elements such as prism blocks or dichroic mirrors, and a set of second relay lenses. Image pick-up tubes for three colors are provided behind the second relay lenses. The pick-up tubes are mounted in coil assemblies. Each coil assembly is provided with a rotating device for conducting a position adjustment of the tube with respect to the associated second relay lens to make perfect registration between images of the three tubes. A focus adjusting device for conducting a focus adjustment between each second relay lens and the associated image pick-up tube is provided in each second relay lens. The focus adjusting devices are operable from outside the camera for sliding the second relay lenses in the direction of their optical axes.

Color separation optical system for color television camera

An optical color-separation system for use in a color television camera having an image plane compensating lens associated with each of three camera tubes. Each compensating lens is provided with a diffusing area lying on the periphery thereof so as to be out of the image forming optical path. Photo-diodes are provided in opposing relation to the diffusing area. Light from the photo-diodes passes through the diffusion area to provide bias light for the camera tube.

Growing community of inventors

Omiya, Japan

Toshiro Yamauchi