Patent ID: 7015634
Filing Date: 2006-03-21
Classification: H01J

Abstract:
1. A projection type cathode ray tube device comprising a vacuum envelope which includes a rectangular panel portion having a phosphor screen formed on an inner surface thereof, a neck portion housing an electron gun which irradiates an electron beam inside thereof, a funnel portion for connecting the panel portion and one end of the neck portion, and a stem portion for sealing the other end of the neck portion, a deflection yoke which makes the electron beam scan on the phosphor screen, and a convergence yoke, wherein the neck portion includes a first neck portion which is arranged at the funnel portion side and has a first outer diameter, a second neck portion which is arranged closer to the stem portion side than the first neck portion and has a second outer diameter, and a third neck portion which connects the first neck portion with the second neck portion, wherein the first outer diameter is smaller than the second outer diameter, the deflection yoke is arranged in a transitional region between the funnel portion and the first neck portion and the convergence yoke is arranged to stride over the second neck portion and the third neck portion, and first magnets which have different polarities from each other in the horizontal direction are arranged at upper and lower positions of a funnel-side opening portion of the deflection yoke as the electron beam which is deflected to the upper and lower portions of the screen receives a force to a center direction of the screen, and the first magnet arranged at the upper side of said opening portion and the first magnet arranged at the lower side of said opening portion differ in polarity at left and right sides.