Patent ID: 6822801
Filing Date: 2004-11-23
Classification: G02B,H04N

Abstract:
A focusing state determination device for a taking lens, comprising:a plurality of focusing state determination imaging elements which are arranged at positions having optical path lengths with respect to the taking lens different from each other, the taking lens being interchangeably connectable to a camera main body; and a light splitting device which is arranged on an optical path in the taking lens, and splits light of color components in a wavelength range of 500 nm to 600 nm in subject light passing through the taking lens before entering a color resolution optical system in the camera main body at a side of the taking lens into subject light for video entering an imaging element for video in the camera main body and subject light for focusing state determination incident on the plurality of focusing state determination imaging elements, wherein a focusing state of the taking lens is determined according to high frequency components of image signals obtained by the plurality of focusing state determination imaging elements.