Abstract: A reel to reel magnetic tape cassette having a tape guide adjacent the supply reel comprising a rotatable element and a guide adjacent the take up reel which is a non-rotatable element whereby frictional resistance of the tape is reduced at the unreeling side and loosening or slack of the tape during transport is minimized.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder comprising an urethane resin and a vinyl chloride-vinyl acetate-maleic acid copolymer having a content of maleic acid component of at least 1.5%.

Abstract: A coil unit formed of a coil-wound inner core partially circumferentially encased by an outer core. The coil unit is mounted on a plate with the outer core externally exposed and covering the lead-in wires to the coil which are adhered to contacts on the plate.

Abstract: An ultrasonic wave transducer capable of generating a convergent ultrasonic sound beam has been found. The transducer comprises a piezoelectric substrate, at least one interdigital electrode group arranged on the surface of the piezoelectric substrate, each of said groups having a plurality of interdigital electrodes arranged in the longitudinal direction of the fingers of each interdigital electrode, said substrate being positioned in a liquid so that at least said interdigital electrodes contact with the liquid, and said electrodes being applied an alternating voltage with a predetermined phase difference thus providing a convergent sound beam in y-direction based upon the principle of interference between the sound beams, similar to the interference by a diffraction grating. Further, the non-uniform arrangement of the fingers of the interdigital electrodes provides the x-direction convergence, thus, an ultrasonic wave beam focusing at a single point is obtained.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a first non-magnetic powder of Al.sub.2 O.sub.3 and/or Cr.sub.2 O.sub.3 at a ratio of 0.5 to 15 wt. % based on said magnetic powder; a second non-magnetic powder of TiO.sub.2, SiC, SiO.sub.2, ZrO.sub.2 and/or CeO.sub.2 at a ratio of 0.5 to 15 wt. % based on said magnetic powder and a total of said non-magnetic powders of less than 20 wt. % based on said magnetic powder.

Abstract: The present invention consists of insulating material fibers and an electroless plating layer formed on the fibers. The plating layer preferably consists of a nickel phosphorous alloy. A squeezing means for forcing the printing ink to pass through a printing pattern and/or a printing base for mounting an article to be printed are provided with a heating means.

Abstract: A magnetic recording tape or disc which has excellent physical characteristics of adhesive strength, a repeated running durability, and a gloss degree of the surface as well as excellent electromagnetic characteristics. A binder of a magnetic paint coating comprises 30 to 70 wt. % of an urethane resin, 10 to 50 wt. % of an epoxy resin and 10 to 50 wt. % of nitrocellulose, and if necessary a curing agent.

Abstract: A magnetic recording medium obtained by coating a magnetic metallic powder with a binder on a non-magnetic substrate, wherein said magnetic metallic powder is mainly made of acicular particles obtained by a dry reduction process and said magnetic recording medium has a residual magnetic flux density of greater than 2,600 gauss, a coercive force of 1,300 to 1,800 Oe, a thickness of a magnetic layer of 1.5 to 3.5 .mu.m and a C/N ratio (carrier signal/noise level) in video band of greater than 4 dB of the C/N ratio of the standard video tape.

Abstract: A transformer having a main winding and a control winding has a pair of E-shaped cores (10, 11), and an I-shaped third core (13) positioned on one E-shaped core (10). A small groove (14) is provided on the base plate (10c) of the first E-shaped core (10). A control winding (12) is wound on the I-shaped core (13) so that the winding (2) rests in the groove 14. Those cores (10, 11, 13) are made of ferrite material. Thus, both the main winding and the control winding can be produced using a winding machine.

Abstract: A magnetic recording medium having a magnetic layer comprises a magnetic powder, a binder, a nonionic or anionic surfactant and a silicone oil having a viscosity of 500 c.s. or lower.

Abstract: A coil element formed from a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of the drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of the magnetic members connected to the ends of the coil.

Abstract: A magnetic recording medium comprising a non-magnetic substrate having fine holes in a direction of thickness and a magnetic material filled in said fine holes. The fine holes have a diameter ranging from 200 A to 5000 A and a depth ranging from 2000 A to 5 .mu.m at a ratio of depth to diameter of 1 or more.

Abstract: A magnetic recording medium including a substrate having a magnetic coating layer thereon, said magnetic coating layer comprising ferromagnetic particles dispersed in a binder vehicle, characterized in that the magnetic coating layer contains one or more ketones selected from the compounds expressed by the general formula ##STR1## wherein R.sub.1 and R.sub.2 represent saturated or unsaturated chain aliphatic radicals, both or either of which have 11 to 22 carbon atoms and may contain hydroxyl, carboxyl or amino groups.

Abstract: A magnetic recording tape or disc which has excellent total characteristics of an adhesive strength, a repeat running durability, an electromagnetic characteristic, a gloss degree of the surface and a curling is provided. A binder of a magnetic layer comprises 40 to 70 wt. % of a urethane resin, 15 to 40 wt. % of an epoxy resin and 10 to 40 wt. % of a phenoxy resin.

Abstract: In a magnetic recording medium having a substrate coated with a magnetic layer comprising a magnetic powder and a binder, an improvement characterized in that said binder in said magnetic layer essentially consisting of 20 to 60 wt. % of a polyurethane, 15 to 45 wt. % of a polyester resin and 20 to 50 wt. % of a vinyl chloride-vinyl acetate copolymer-impregnated nitrocellulose.

Abstract: A magnetic recording medium comprises a magnetic layer formed by coating a magnetic powder composition obtained by mixing an abrasive powder having an average diameter of 0.8 .mu.m or more and an abrasive powder having an average diameter of 0.4 .mu.m or less and a magnetic powder in a binder, on a base film.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic powder composition comprising a magnetic powder and an organic binder having a main component of vinyl chloride-vinyl alcohol copolymer.

Abstract: A magnetic tape cassette including an intermediate frame which has flat upper and under surfaces in parallel and provides a sufficient space therein to hold a length of magnetic tape, and substantially flat top and bottom plates fastened, respectively, to the flat upper and under surfaces of the intermediate frame, characterized in that said intermediate frame is made of a composite resin material which comprises an unsaturated polyester resin and a thermoplastic polymer containing from 50 to 75% by weight of calcium carbonate and glass fiber on the basis of the total resin weight, the intermediate frame having a linear expansion coefficient in the range from 1.times.10.sup.-5 to 3.times.10.sup.-5 /.degree.C., said calcium carbonate and said glass fiber being used in a ratio by weight of from 60:10 to 40:30.

Abstract: A thin metallic layer type magnetic recording medium having thin metallic layers in a structure comprises a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually increases depending upon an increase of a distance from said substrate; and a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually decreases depending upon an increase of a distance from said substrate.

Abstract: A recess for positioning a magnetic tape cassette inserted in a deck is formed near a corner of a guard panel, a small projection is formed on at least one of an inner surface of the guard panel or a front surface of a casing near the side edge of the magnetic tape. A tape guide shaft is fixed inside of a casing so as to place the surface of the tape guide slightly behind the level of the front surface of the casing.