Patent ID: 6937391
Filing Date: 2005-08-30
Classification: G02B,H04N

Abstract:
1. An optical viewer instrument with a photographing function, comprising: a telescopic optical system that observes an object; a digital camera system including a solid-state image sensor and a photographing optical system associated with each other such that the object is formed as a photographic image on a light-receiving surface of said solid-state image sensor through said photographing optical system; and a manually-operable focussing mechanism associated with said telescopic optical system and said photographing optical system such that the object is brought into focus through said telescopic optical system, and such that the object is brought into focus through said photographing optical system, wherein the following conditions are fulfilled: wherein: “F” represents an f-number of the photographing optical system; “y” represents a maximum image height (mm) of the solid-state image sensor, which is defined as one-half of a diagonal line length of the light-receiving surface of the solid-state image sensor; “ω” represents a half field angle (rad) of the telescopic optical system; “T” represents a field ratio of the half field angle “ω” to a half field angle “θ” (rad) of the photographing optical system (T=ω/θ); and “P” represents a pixel pitch of the solid-state image sensor.