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:
Dec. 25, 2007
Filed:
Sep. 18, 2006
Kenichiro Taniwa, Takatsuki, JP;
Etsuji Tagami, Takatsuki, JP;
Kenichiro Taniwa, Takatsuki, JP;
Etsuji Tagami, Takatsuki, JP;
Matsushita Toshiba Picture Display Co., Ltd., Osaka, JP;
Abstract
In the vicinity of an end on the side of a large diameter portion of a deflection device, a pair of first permanent magnets for converging three electron beams in an X-axis direction and a pair of second permanent magnets for diverging them in the X-axis direction are provided. Inclination coefficients Kand Kof the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of the magnetic fields respectively formed by the pair of first permanent magnets and the pair of second permanent magnets satisfy K/K<10 in at least one location within a range of 3 to 13 mm on the side of the phosphor screen with respect to a reference line in the Z-axis direction. An inclination coefficient Kof the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of a combination magnetic field formed by the pair of first permanent magnets and the pair of second permanent magnets and an inclination coefficient Kof the distribution curve near the Z axis on the Y axis of the X-axis direction magnetic flux density of the combination magnetic field are both larger than 1.5 (Gauss/cm) in at least one location within the above-noted range. This achieves excellent spot shapes, thus making it possible to reduce change in convergence characteristics due to temperature variation and pincushion distortion of right and left rasters.