Image rotating optical system
AssigneeFuji Photo Optical Co., Ltd.
InventorsYoshikazu Doi, Toshiro Kishikawa, Hiroshi Yamada
Life of this patent
Estimating the term…
Abstract
In an optical system including an objective lens to form an image on a focusing plane and a relay lens system to carry the image to another focusing plane, an image rotating prism is inserted in the relay lens system and a field lens is provided between the objective lens and the relay lens. The pupil of the relay lens system is positioned at the center of the optical path of the prism by properly selecting the power of the field lens.
Claims7
In an optical system including an objective lens to form an image on a first focusing plane and a relay lens system comprising at least a front lens and a rear lens for carrying the image focused on said first focusing plane to a second focusing plane, an image rotating optical system comprising,
- an image rotating prism system having an odd number of reflecting faces in total for rotating an image formed with the light passing therethrough by the rotation thereof around the optical axis of said light, said image rotating prism being located between said front lens and said rear lens of the relay lens system, and
- a field lens located on said first focusing plane, the focal length of said field lens and said front lens of the relay lens system being selected to position the pupil of the relay lens system conjugate with the aperture of the objective lens at substantially the center of the optical path of said image rotating prism.
Dependencies are inferred from the claim text.