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:
Jul. 22, 2003
Filed:
Feb. 09, 2000
Takeharu Furusawa, Mobara, JP;
Nobuhiko Hosotani, Mobara, JP;
Yoshiki Nakano, Mobara, JP;
Hideyuki Ohsaka, Mobara, JP;
Other;
Abstract
In a shadow mask color cathode ray tube, its shadow mask is not easily deformed into a concave shape when an impact or a vibration is applied to the shadow mask, so that a good image can be displayed. The electron beam passing holes of the shadow mask are each formed of an upper hole etched from the panel side of the shadow mask and a lower hole etched from the electron-gun side of the shadow mask. In each electron beam passing hole located in the peripheral portion of the shadow mask, the ratio of an upper-side etching quantity to a lower-side etching quantity is controlled to be 1.8 or less. By adjusting the balance in strength relative to compressive stresses between the panel side and the electron-gun side of the shadow mask, it is possible to prevent the shadow mask from being deformed into a concave shape.