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:
Mar. 08, 1994
Filed:
Mar. 04, 1992
Applicant:
Inventors:
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356400 ; 33293 ; 356152 ;
Abstract
A level sensor detects a vertical position of a laser beam emitted from an electronic leveling apparatus and comprises a photo-sensing unit having a predetermined vertical length for detecting the laser beam, a plurality of marking indices arranged on a side edge of a housing of the level sensor at a predetermined pitch along the vertical direction of the laser beam, and analog display unit having a plurality of display devices one for each of the marking indices for displaying a change in an incident position of the laser beam along the vertical direction by selective activation of the display devices.