Patent ID: 6804462
Filing Date: 2004-10-12
Classification: G02B,G03B

Abstract:
A single-lens reflex camera comprising:a screen on which an image of an object is projected; a plurality of reflection surfaces for erecting the image on the screen; and an eyepiece system with positive refracting power for observing the image, wherein the eyepiece system comprises, in order from an object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power, and the single-lens reflex camera satisfies the following conditions: 2.5âˆ’1.00.4where fbâ€² is an air-equivalent length, at a diopter of âˆ’0.5 (mâˆ’1), from the screen to an entrance surface of the first lens component; Y is a diagonal length of a picture plane on the screen; f3 is a focal length of the third lens component; f1 is a focal length of the first lens component, and fâ€² is a focal length of an entire system from the screen to an exit surface of the eyepiece system at a diopter of âˆ’0.5 (mâˆ’1).