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:
Feb. 03, 1998
Filed:
Apr. 24, 1996
Satoru Nakamura, Tokyo, JP;
Yasuo Nakamura, Tokyo, JP;
Asahi Kogaku Kogyo K.K., Tokyo, JP;
Asahi Seimitsu K.K., Tokyo, JP;
Abstract
A focusing apparatus for a surveying instrument including an objective lens, a focusing lens and a reticle. The focusing lens is movable in an optical axis direction, by a rotating shaft member which is rotated by a motor, to form an image, of an object to be surveyed, on the reticle. Means for detecting a focus state of the object image and for controlling the motor in accordance with the detected focus state are provided. A focusing knob, coaxial with the rotating shaft member, and movable in an axial direction thereof is also provided. A plurality of clutches disengageably engages the focusing knob or the motor with the rotating shaft member, according to an axial movement of the focusing knob.