Patent ID: 6832942
Filing Date: 2004-12-21
Classification: H01J

Abstract:
A method of manufacturing a cathode ray tube comprising a panel having a fluorescent surface, a shadow mask fitted to the panel with a gap formed therebetween, and a frame including at least two main frames and at least two subframes fixed respectively to ends of the main frames, the method comprising:compressing the main frames such that a distance between the main frames at a center portion thereof is smaller than a distance between the main frames at an end portion thereof; welding the shadow mask to the main frames; and releasing the compression on the main frames, wherein, when it is assumed that â€˜aâ€™ denotes a distance between the main frames before being compressed, and â€˜bâ€™ denotes a distance between the main frames during assembly of the shadow mask and the main frames, a compression change ratio â€˜Râ€™ of the main frames at a center portion thereof satisfies the following equation: 3.0%&lE;R=(aâˆ’b)/a* 100&lE;5.0%.