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. 11, 2014
Filed:
Apr. 11, 2008
Kenichi Nakatate, Sakura, JP;
Takashi Tsumanuma, Sakura, JP;
Jun Yamagishi, Tokyo, JP;
Akemi Katou, Hitachi, JP;
Kenichi Nakatate, Sakura, JP;
Takashi Tsumanuma, Sakura, JP;
Satoshi Katou, Hitachi, JP;
Jun Yamagishi, Tokyo, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
A welding observation apparatus is provided to use partial darkening by a telecentric optical system and a photochromic filter (PCF) as an optical system for filtering light emission from arc discharge in order to verify the welding condition under the welding arc discharge, without forming an image on the PCF, so that light reducing performance can be secured even if a focus shifts from on the PCF, with satisfactory monitoring of welding condition. The welding observation apparatus comprises: an arc welding unit; an objective optical system () for concentrating light from the arc welding unit; a telecentric optical systemfor guiding the light concentrated by the objective optical system (); a PCFfor illuminating with the light guided by the telecentric optical system; and a solid state imaging devicefor receiving the light passing through the PCF, wherein the light from the arc welding unitis partial-darkened by the PCF