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. 20, 1991
Filed:
Feb. 05, 1990
Applicant:
Inventors:
Hiroko Ohta, Hachioji, JP;
Tsugiko Takase, Hachioji, JP;
Shuzo Mishima, Hachioji, JP;
Hirofumi Miyamoto, Hachioji, JP;
Takao Okada, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; H01J / ;
U.S. Cl.
CPC ...
3241 / ; 324 96 ; 3241 / ; 3241 / ; 250306 ;
Abstract
A probe unit includes a disk-like substrate made of transparent material, a transparent electrode coated on all over the substrate, and a metal wire whose sharp tip is projected vertically and upwardly from the center of the substrate through the transparent electrode. The metal wire is made of Pt-Ir, which incudes a sharp tip projected from the upper surface of the substrate and a stem embedded in a hole of the electrode and fixed to the electrode and substrate by conductive adhesive.