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:
Apr. 04, 1995
Filed:
Mar. 24, 1993
Hiroaki Tobuse, Amagasaki, JP;
Tomoyuki Kanda, Amagasaki, JP;
Yasusi Hisaoka, Amagasaki, JP;
Shigeo Sasaki, Amagasaki, JP;
Minoru Kobayashi, Amagasaki, JP;
Takuji Oda, Amagasaki, JP;
Ryuji Ueda, Amagasaki, JP;
Akio Yoshida, Tokyo, JP;
Tadayoshi Owaki, Nagaokakyo, JP;
Akihiko Yamasaki, Nagaokakyo, JP;
Masaaki Kinoshita, Nagaokakyo, JP;
Toshiaki Fukunishi, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a color cathode-ray tube, only a foreign matter adhering to a shadow mask is removed effectively without thermal deformation of the shadow mask or thermal denaturation of phosphors. An electron beam produced by an electron gun incorporated in a cathode-ray tube itself is scanned or irradiated to all over a shadow mask of the color cathode-ray tube. The radiant state of a fluorescent screen at this stage is checked to detect a foreign matter adhering to the shadow mask. The electron beam is deflected to align with the position at which the foreign matter is detected, and then irradiated to the foreign matter in the form of pulses. Thus, the foreign matter is heated and removed.