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:
Nov. 09, 2010
Filed:
Mar. 31, 2008
Minoru Ando, Yamanashi, JP;
Eiji Kobayashi, Yamanashi, JP;
Satoshi Kagiwada, Yamanashi, JP;
Fanuc Ltd, Minamitsuru-gun, Yamanashi, JP;
Abstract
A laser () provided with a discharge activation power supply () supplied with power from a 3-phase AC power line, the discharge activation power supply () provided inside it with three first capacitors (, and), the laser () including an external ground fault protection device comprising a voltage measuring unit using the first capacitors (, and) to measure voltages between the phases of the 3-phase AC power line and the ground and a power breaking unit () comparing the values of voltages measured by the voltage measuring unit and a predetermined threshold and breaking the supply of power from the 3-phase AC power line to the power supply () when the value of a voltage exceeds the threshold.