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:
Sep. 20, 2005
Filed:
Oct. 18, 2001
Masami Shirai, Saitama, JP;
Shunichiro Wakamiya, Saitama, JP;
Homu Takayama, Saitama, JP;
Kenji Kaneko, Saitama, JP;
Masami Shirai, Saitama, JP;
Shunichiro Wakamiya, Saitama, JP;
Homu Takayama, Saitama, JP;
Kenji Kaneko, Saitama, JP;
PENTAX Corporation, Tokyo, JP;
Abstract
A surveying instrument includes a sighting telescope having an objective lens and an eyepiece; an erecting optical system functioning so that an image formed by said objective lens is viewed as an erect image through the eyepiece; and a light shield device, positioned in an optical path extending from an incident surface of the erecting optical system to an exit surface of the erecting optical system, for preventing an off-field light bundle which is incident on the erecting optical system from reaching the eyepiece.