Abstract: A powder magnetic core according to an aspect of the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. The powder magnetic core contains 88 volume % or more of magnetic powder, and when a cross-sectional photograph of the powder magnetic core is taken, an area of the cross-sectional photograph having a size of 10000 ?m2 is divided into unit areas, one or more of the unit areas in which the size of a cross-sectional area of a binder accounts for 50% or more of the unit area are extracted as specific unit areas, and the percentage of the number of specific unit areas with respect to the total number of unit areas is equal to or larger than 0.2% but equal to or smaller than 3.0%.

Abstract: A powder magnetic core capable of achieving a low loss in a high frequency range is provided. A powder magnetic core according to the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. A volume filling percentage of the magnetic powder included in the powder magnetic core is 85 volume % or higher, and a value obtained by dividing a BET specific surface area (m2/g) of the powder magnetic core by a specific surface area (m2/g) calculated using outer dimensions of the powder magnetic core is 5000 or less.

Abstract: A color cathode-ray tube apparatus comprising a video signal generator, a delay circuit, an electron gun assembly, a deflection yoke, a shadow mask, and a phosphor screen. The signal generator generates three video signals simultaneously. The delay circuit delays the first and second video signals with respect to the third video signal. The screen has phosphor elements regularly arranged. The electron gun assembly generates three electron beams at different times, in response to the three signals output by the delay means. These beams are applied to the phosphor screen, and the phosphor elements of the screen emit red light, green light and blue light. Any three electron beams the gun assembly emits simultaneously form three beam spots on the screen. These spots overlap for a distance longer than half the horizontal diameter of a beam spot formed by an electron beam of the greatest current which the gun assembly can generate.

Abstract: A color picture tube comprises a panel of a substantially rectangular shape, a phosphor screen formed on the inner surface of the panel, a stud pin which is made of a rod with a tapered portion and which is mounted on the inner side surface of the panel, a spring member having a through hole and fitted with the tapered portion of the stud pin through the through hole, and a shadow mask mounted on the panel through the stud pin and the spring member so as to be opposite or adjacent to the phosphor screen, wherein if the spring member is in contact with the stud pin at least two positions, the following inequality is satisfied:N/F.ltoreq.1.8whereN: a force of the spring member acting on that portion of the stud pin which contacts the spring member along a direction substantially perpendicular to the surface of the stud pin (kg.

Abstract: A color picture tube having a shadow mask structure with a shadow mask and a mask frame supporting the shadow mask facing a phosphor screen inside a panel comprises a plurality of V-shaped support members, each having a folded portion apart from a sidewall of the mask frame and two arm portions extending from the folded portion.The support members support the shadow mask structure to the panel to control a relative distance beween the phosphor screen and the shadow mask according to thermal expansion of the shadow mask structure or the panel, whereby positions impinged by an electron beam on the phosphor screen remained invariably.

Abstract: In a color picture tube in which a shadow mask is placed close to a phosphor screen inside an envelope which has an oblong-shaped panel, the shadow mask is supported at the four corners of the panel by plate spring members. The spring members are each constructed from a 1st member which is fixed so that it is easily mounted on and dismounted from the stud pins on the panel and a 2nd member which is welded to the mask frame of the shadow mask. These members are incorporated as one by face-welding together at their ends. In this type of spring member structure, the members work together to alleviate the bending deformation which is applied to the members through the repeated mounting of the shadow mask panel which accompanies production.

Abstract: In a color cathode ray tube, a shadow mask is stretched on a mask frame and the mask frame is supported on a peripheral inner surface of a skirt of a panel by an elastic deformable plate member. The elastic deformable plate member is formed by bending a metal plate and has a straight plate section with a predetermined analge .alpha. defined by the following inequality.tan (.alpha.)>(.alpha.m/.alpha.f) tan (90-.beta.)where .beta. is an angle formed by a tube axis and one of the electron beams which passes through effective one of apertures of the shadow mask, said one of the apertures being closest to the plate member, and .alpha.m and .alpha.f are thermal expansion coefficients of the shadow mask and mask frame, respectively.

Abstract: A piezoelectric audible sound generator having a feedback type piezoelectric transducer, an amplifier, and a phase compensator for adjusting the phase shift due to the combination of a bias resistance of the amplifier and equivalent capacitance of the piezoelectric transducer.

Abstract: An H-type ceramic resonator having two resonating leaves, a connecting leaf for bridging the two resonating leaves to form an H-shape, and electrodes disposed on at least both surfaces of the resonating leaves. The resonator has a dimensional relationship which falls within the following equities:B.sub.2 /B.sub.3 =4 to 6,B.sub.1 /B.sub.3 =2 to 4, andL/B.sub.1 =5 to 6wherein L is a length of each of the resonating leaves, B.sub.1 is a width of each of the resonating leaves, B.sub.2 is a distance between the two resonating leaves, and B.sub.3 is a width of the connecting leaf.