Patent ID: 7460778
Filing Date: 2008-12-02
Classification: G02B,H04N

Abstract:
1. A taking lens capable of being used for photographing by light in each of at least two wavelength regions, the at least two wavelength regions including a first wavelength region and a second wavelength region, the taking lens comprising: a first lens that adjusts a focus of the taking lens; a second lens that adjusts a flange back of the taking lens; a lens driving unit that moves a position of the second lens in a direction along an optical axis of the taking lens; a storing unit that stores a correcting amount of the second lens in photographing by light in the second wavelength region, the correcting amount being determined on the basis of: a change amount of an optical length of the taking lens in photographing by light in the second wavelength region relative to an optical length of the taking lens in photographing by light in the first wavelength region; and a change amount of an optical length of a television camera body, on which the taking lens is mounted, in photographing by light in the second wavelength region relative to an optical length of the television camera body in photographing by light in the first wavelength region; and a lens controlling unit that controls the lens driving unit, wherein when the taking lens is used in photographing by light in the first wavelength region, the lens driving unit moves the second lens to a set position adjusted at the flange back; and when the taking lens is used in photographing by light in the second wavelength region, the lens driving unit moves the second lens based on the correcting amount read from the storing unit so that an image location in photographing by light in the second wavelength region coincides with an image location in photographing by light in the first wavelength region.