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:
Oct. 08, 2002
Filed:
Mar. 30, 2001
Munehiro Yamashita, Uji, JP;
Michio Kaida, Uji, JP;
Nidec-Read Corporation, Uji, JP;
Abstract
A probe is made to contact one end of the test wiring of a circuit board , with a head electrostatically coupled to the other end of said wiring. A pulse-like DC voltage is supplied from a signal source , and, simultaneously with a switch section SWp turning on, the maximum voltage is applied to the test wiring. If a detection signal is below a specified value, then a computer will read it as “open” or “shorting”. Further, a tip of the head is associated with the circuit board only through an insulating sheet , so that the tip is kept away from each pad of a pad section on the board at a fixed distance (equivalent to the thickness of insulating sheet ). Thus, continuity testing may be performed in a non-contact manner by moving head only in X and Y directions without movement in the Z-direction.