The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 1998
Filed:
Jun. 20, 1997
Takayuki Sensui, Tokyo, JP;
Takayuki Ito, Tokyo, JP;
Hirofumi Matsuo, Tokyo, JP;
Satoru Nakamura, Tokyo, JP;
Tatsuo Goto, Tokyo, JP;
Yasuo Nakamura, Tokyo, JP;
Asahi Seimitsu Kabushiki Kaisha, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An inner focus type telescope includes a sighting objective lens, a focusing lens, a horizon compensating optical system, a focal plane, and an eyepiece through which an object image formed on the focal plane can be viewed, arranged in this order from the object side. The position of the focusing lens is adjustable to form the object image on the focal plane in accordance with the distance of an object to be viewed. The telescope further includes a beam splitting optical system provided in the optical path between the objective lens and the focal plane to split the optical path, a surface equivalent to the focal plane, provided in the beam splitting optical system, and a focus detecting system which detects the state of the focus at the equivalent surface.