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:
Jun. 13, 1978
Filed:
Feb. 25, 1977
Applicant:
Inventor:
Jacques Trotel, Paris, FR;
Assignee:
Thomson-CSF, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G21G / ;
U.S. Cl.
CPC ...
2504 / ; 250491 ;
Abstract
A device is provided for adjusting electron-optical apparatus. The specimen to be scanned is equipped with a marker emitting back-scattered electrons. A transducer, in response to these electrons, emits a signal which unblocks the modulating electrode of a cathode ray tube used for the display purpose. The tube screen has long persistance characteristics; the beam and the object holder being displaced in four mutually perpendicular directions by theoretically corresponding quantities, the adjusting errors are visible immediately.