Patent ID: 7193585
Filing Date: 2007-03-20
Classification: G02B

Abstract:
1. An image observation system, comprising: a pair of image observation devices each having i) an image pickup device, ii) an image pickup optical system for directing light rays from an outside world to said image pickup device, iii) a display device for displaying an outside world image obtained by said image pickup system, and iv) a display optical system for directing light from said display device to an observing eye, wherein, where an axis containing a center of an entrance pupil of said image pickup optical system and a point being conjugate with a center of said image pickup device with respect to said image pickup optical system is taken as an optical axis of an image pickup system while an axis containing a center of an exit pupil of said display optical system and a point being conjugate with a center of said display device with respect to said display optical system is taken as an optical axis of a display system, the optical axis of the image pickup system and the optical axis of the display system optical axis are disposed coaxially, wherein the optical axes of the image pickup systems of the pair of image observation devices define a point of intersection, wherein a focal plane being at a position conjugate with a surface of said image pickup device with respect to said image pickup optical system is disposed at a side of the intersection point of the optical axes of the image pickup systems, which side faces an observer, and wherein, when the distance from an entrance pupil of said image pickup optical system to a focal plane of said image pickup optical system is H, the size of the entrance pupil of said image pickup optical system is D, the focal length of said image pickup optical system is f, and the size of one picture element of said image pickup device is a, the distance L from the entrance pupil of said image pickup optical system to the intersection point satisfies the following relation: