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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||250/204 ; 250/201 ; 354/25|
|우선권정보||JP-0092895 (1976-08-04); JP-0028835 (1976-03-17)|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 10 인용 특허 : 2|
Behind an objective which is axially movable, is provided a beam splitter to divide the light path passing through the objective into two light paths. In one of the light paths on the image plane of the objective is located a prism. Behind the prism is provided a photodetector in the optical path includng the prism. In the optical path which does not have the prism also is provided a photodetector at a position which is optically conjugate with the other photodetector. The output of the photodetectors are connected to an output comparing circuit which is...
A device for automatically focusing an image in an optical instrument including an objective comprising an axially movable objective, means for axially moving said objective in accordance with an electric focusing signal given thereto, means for dividing the optical path of the light passing through the objective into two optical paths located before the image plane of the objective, a refraction optical element located substantially on said image plane in one of said two optical paths, a first focusing means located behind said refraction optical elemen...