Abstract: A cathode ray tube is disclosed wherein the stress at a bonding portion between a glass member and a metal member is moderated. The cathode ray tube includes a panel made of glass, a skirt element made of metal and attached to a peripheral edge of the panel, and a funnel connected to the skirt element. The skirt element has a rib or ribs for reinforcement provided thereon. The cathode ray tube may be incorporated in a display apparatus.

Abstract: A cathode ray tube in which a reduction in weight can be contrived and scattering of glass upon implosion can be prevented effectively. The cathode ray tube comprises an HS band (2) surrounding the peripheral edge of a panel (11), and a resin panel (3) disposed in the state of covering the surface of the panel (11) and connected to the HS band (2). The surface of the panel (11) and the resin panel (3) may be fixed with an adhesive, the resin panel (3) and the HS band (2) may be fixed with an adhesive, the resin panel (3) and the HS band (2) may be mechanically fixed by use of bolt/nut pairs, a wire or the like, and the resin panel (3) and the HS band (2) may be connected through fitting members (21) for fitting to a display device casing which are provided on the HS band (2).

Abstract: A CRT in its entirety is to be rendered lightweight without detracting from the resistance against pressure of a panel or from characteristics desirable for the CRT. To this end, there is provided a glass panel for a CRT obtained on chemically reinforcing the glass containing 57 to 64 wt % of SiO2, 0.1 to 4 wt % of Al2O3, 5 to 10 wt % of Na2O, 5 to 10 wt % of K2O, 7 to 13 wt % of SrO, 7 to 11 wt % of BaO, 0.1 to 2 wt % of TiO2, 0.1 to 4 wt % of ZrO2 and 0.01 to 1 wt % of CeO2.

Abstract: An electron gun cathode structure includes a support member made of an insulating material, a first grid fixed to the support member, and a cathode disposed on the side of the support member opposite to the first grid. A thermal expansion .DELTA.L.sub.S /L.sub.S of the insulating material constituting the support member due to heat from the cathode is larger than a thermal expansion .DELTA.L.sub.G /L.sub.G of a material constituting the first grid due to heat from the cathode. A manufacturing method of an electron gun cathode structure includes preparing a member including a first face and a second face having a step therebetween, a height of the step being equal to a predetermined distance d.sub.12, placing a first grid on the first face, placing a spacer on the second face, placing an insulating support member on the first grid and the spacer, and grinding a top surface of the spacer opposite to its surface that is fixed to the support member so that an actual distance d.sub.12 becomes a desired value.

Abstract: An electron gun cathode structure includes a support member made of an insulating material, a first grid fixed to the support member, and a cathode disposed on the side of the support member opposite to the first grid. A thermal expansion .DELTA.L.sub.s /L.sub.s of the insulating material constituting the support member due to heat from the cathode is larger than a thermal expansion .DELTA.L.sub.G /L.sub.G of a material constituting the first grid due to heat from the cathode. A manufacturing method of an electron gun cathode structure includes preparing a member including a first face and a second face having a step therebetween, a height of the step being equal to a predetermined distance d.sub.12, placing a first grid on the first face, placing a spacer on the second face, placing an insulating support member on the first grid and the spacer, and grinding a top surface of the spacer opposite to its surface that is fixed to the support member so that an actual distance d.sub.12 becomes a desired value.

Abstract: In a cathode assembly of a cathode ray tube, a cathode having an emitter is inserted in a through-hole formed in an insulator. The emitter is provided so as to face a cylindrical electrode of a first grid at a predetermined distance. A hole communicating with the through-hole is formed at a longitudinal side of the insulator, and a tubularly rising shelter is provided between the emitter in the through-hole of the insulator and the hole. This satisfies (E.times.B)-(C.times.E)+(C.times.D)-(A.times.D).gtoreq.A. D, where the height of the hole is A, the height of the shelter is B, the length from the lower end of the shelter to the head of the cathode is C, the length between the cathode and the shelter is D, and the length between the cathode and the insulator is E. The cathode assembly prevents metal vapor, such as barium oxide of the cathode and nickel or chromium of the sleeve, from spreading through the hole of the insulator.