摘要:
The present invention provides a color cathode-ray tube that can attenuate vibration of an entire shadow mask positively with a simple structure. The color cathode-ray tube comprises a frame-shaped mask frame and a shadow mask in which many apertures are formed in a flat plate, the shadow mask being stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction. The amplitude in the end portions of the shadow mask is not less than a certain amount relative to the amplitude in the center portion of the shadow mask, in a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube. Furthermore, by providing vibration attenuators at the end portions of the shadow mask, vibrations at the end portions of the shadow mask are attenuated as the side surfaces of the shadow mask slide on the vibration attenuators. Thus, vibration of the entire shadow mask can be extinguished positively.
摘要:
A method of making a steel sheet for a tension mask, including the steps of: hot rolling a steel consisting essentially of, by weight %, C: less than 0.1%, Si: 0.05% or less, Mn: 0.4 to 2%, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01% or less, N: 0.010% or more, and the balance of Fe; and annealing the cold rolled steel sheet, followed by a secondary cold rolling at a reduction rate of 35% or higher. The steel sheet produced by this method shows excellent creep resistance during blackening treatment and excellent magnetic shielding property with an anhysteretic permeability of 3400 or more at a DC bias magnetic field of 0.35 Oe, and therefore causes no color-deviation when applied to the tension mask.
摘要:
The color cathode ray tube according to the present invention can improve the brightness without compromising strength by making the bridge width in one-dimensional tension type shadow mask narrower to a certain degree. The color cathode ray tube has a color selection electrode, the color selection electrode including a pair of supports facing each other; a shadow mask provided with a plurality of slot apertures, the shadow mask being stretched and fixed by the pair of supports; and elastic members arranged between the supports, and holding the supports. Bridges between vertically adjacent slot apertures are formed on the shadow mask. Defining the bridge width W as the largest vertical width of a bridge, the narrowest bridge width Wmin is in a range of 3-10% of a vertical pitch of the slot apertures. With this configuration, the necessary strength can be ensured, and the brightness can be improved without compromising strength, because the bridge widths W can be made narrower.
摘要:
A tensioned shadow mask for a cathode ray tube (CRT), including: a series of parallel strips separated by slits having a predetermined interval; a plurality of tie bars interconnecting adjacent strips to define a plurality of slits at predetermined intervals; and a plurality of dummy bridges disposed between adjacent tie bars, extending from one of the strips to the other but not interconnecting the adjacent strips, wherein a length of the dummy bridges is greater than a length of the tie bars in the longitudinal direction of the strips.
摘要:
A metal part inside of the cathode ray tube, including a first member and a second member which are different in thickness and welded to each other has a welding point encompassed to thereby form a hermetic space between the first and second members. Since the fine powder generated at the time of welding is contained within the hermetic space, its movement due to the vibration or the like is restrained.
摘要:
In a color cathode ray tube in which the external surface of an effective portion of a panel has a flat surface or a slight curvature, the shadow mask is set such that the layout distance between electron beam through hole array near the long side of an effective surface of the shadow mask is larger in the vicinity of the short axis than the layout distance at the center of the effective surface. Further, the layout distance becomes gradually smaller in direction away from the short axis, and thereafter, the layout distance changes to an increase. In the vicinity of the short side of the effective surface, the layout distance becomes equal to or larger than the layout distance near the short axis. Therefore, the curvature of the shadow mask and the electron beam through hole array are set in proper condition, and mislanding of beam landing due to deformation or oscillation of the shadow mask can be reduced. At the same time, howling of the phosphor screen can be minimized.
摘要:
A tensioned shadow mask for a color cathode ray tube (CRT) adopting the same. In the color CRT including a faceplate on an inner side, a phosphor screen, a tensioned mask, and frame assembly secured to the faceplate, a funnel connected to the faceplate, the funnel having a neck portion and a cone portion, an electron gun in the neck portion of the funnel, and a deflection yoke on the cone portion of the funnel, the tensioned mask including a series of parallel strips separated by slits at an interval, tie bars interconnecting adjacent strips and defining slits at intervals, and dummy bridges disposed between adjacent tie bars, the dummy bridges respectively extending from adjacent strips toward each other in respective slits but not interconnecting the adjacent strips.
摘要:
A tension mask and a tension mask and frame assembly for a color cathode ray tube (CRT). The tension mask and frame assembly includes: a tension mask including an aperture portion having a series of strips disposed at predetermined intervals to define slits, and tie bars interconnecting adjacent strips, and a non-aperture portion having side members disposed parallel to the strips on both sides of the aperture portion, wherein strips near the side of the aperture portions and the side members have a predetermined partial pin cushion curvature, and a frame including a pair of support members disposed parallel to each other, for supporting the tension mask under tension acting in the vertical direction of the strips, such that a tension acts on the horizontal direction of the tension mask through the tie bars, due to the curvature of the tension mask, and a pair of elastic members fixed to both ends of the support members for supporting the support members.
摘要:
A color picture tube having a tension mask attached to a support frame, wherein the mask if made from a material having a significantly lower coefficient of thermal expansion than the coefficient of thermal expansion of the material of the frame. The frame tensions the mask to have a fundamental resonant frequency of 90 Hz±20 Hz.
摘要:
A color cathode ray tube is provided with a shadow mask structure which includes a shadow mask formed by integrally forming an apertured portion, an imperforate portion and a skirt portion, and a support frame having a frame portion into which the skirt portion is fitted. The skirt portion of the shadow mask has respective long sides and respective short sides thereof recessed inwardly, and the frame portion has respective long sides and respective short sides formed in planes having no welding bosses, and the skirt portion is fitted into and welded to the frame portion. Furthermore, an end of the outside of the skirt portion and the inner wall of the frame portion have respective entire peripheries thereof come into contact with each other. With such a construction, the shadow mask structure has a small magnetic resistance and the shadow mask is prevented from being vibrated at the time an external vibration is applied to the cathode ray tube. Furthermore, the shadow mask can be easily assembled and can provide an apertured portion which is free from deformation.