Patent ID: 6188170
Filing Date: 2001-02-13
Classification: H01J

Abstract:
A color cathode ray tube comprising:an envelope including a panel having an effective substantially rectangular portion in which a phosphor screen is formed on an inner surface thereof and a skirt portion provided on a periphery of the panel, and a funnel attached to the skirt portion;a shadow mask arranged in the envelope to oppose the phosphor screen; andan elastic support elastically supporting the shadow mask relative to the skirt portion;the shadow mask including a substantially rectangular mask body having a number of electron beam passage apertures, and a substantially rectangular mask frame having four side walls supporting the periphery of the mask body,each of at least two side walls opposing each other of the mask frame having a central connecting portion which is provided at a central portion of the side wall in a lengthwise direction thereof and fixed to the mask body, a pair of end connecting portions which are located on both ends of the side wall in the lengthwise direction thereof and fixed to the mask body, and a pair of protruding portions which are provided on both sides of the central connecting portion with respect to the lengthwise direction of the side wall and protrude in a direction away from the mask body, each of the protruding portions defining a gap between the side wall and the mask body, and each gap having a width increasing from the central connecting portion to the end connecting portion, and each gap width being a maximum width between the central connecting portion and the end connecting portion.