Patents Assigned to TDK Electronics
  • Magnetic recording medium with stepwise orientation of deposited metallic particles
    Patent number: 4371590
    Abstract: A magnetic recording medium having multi-layer structure of two or more thin metallic layers on a substrate. The orientations of metallic particles are different for each of said thin metallic layers.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: February 1, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Toshiaki Izumi, Seitoku Saito, Fumio Maruta, Minoru Kameya
  • Magnetic tape cassette
    Patent number: 4371131
    Abstract: A magnetic tape cassette having one or more guide pole which is forcibly inserted at each end into each axial hole formed in a casing comprises an air releasing portion for releasing air during the forcible insertion of said guide pole in said axial hole.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: February 1, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Masatohsi Okamura, Kimio Tanaka
  • Tapping boss of magnetic tape cassette
    Patent number: 4371286
    Abstract: A tapping boss formed in one piece with the upper half casing for joining the lower half casing of a magnetic tape cassette comprises a stem having a cross sectional area slightly larger than the diameter of a tapping screw to receive the screw and a plurality of ribs which project radially from the cylindrical surface of said stem and whose top portions provide contact shoulders for the boss supporter of a lower half casing.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: February 1, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Masatoshi Okamura, Haruo Shiba
  • Magnetic recording medium
    Patent number: 4370383
    Abstract: A urethane resin comprising the reaction product of a C.sub.4 -C.sub.8 alkylenediisocyanate as an isocyanate component and a C.sub.3 -C.sub.12 alkyleneglycol as a polyol component is used as a rubber component for a binder in a magnetic layer of a magnetic recording medium.
    Type: Grant
    Filed: November 18, 1980
    Date of Patent: January 25, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Hiroshi Kawahara
  • Magnetic recording medium
    Patent number: 4370384
    Abstract: A magnetic recording medium having a substrate coated with a magnetic layer comprising a magnetic powder and a binder essentially consisting of 20 to 70 wt. % of a polyester resin, 80 to 30 wt. % of a vinyl chloride-vinylidene chloride copolymer and a polyisocyanate.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: January 25, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Akihiko Hosaka, Yukihiro Isobe, Kiyotaka Okuyama
  • Through type high-withstand-voltage ceramic
    Patent number: 4370698
    Abstract: In elliptical shaped insulated high voltage ceramic capacitors, subjected to higher heat and temperature, stresses are formed which causes gaps between the insulation and ceramic capacitor. To solve this and other problems a hollow elliptical shaped plastic cover is positioned below the capacitor ground conductor. The cover has a bridge which separates the cross section of the cover into two substantially circular areas an insulator is injected into the cover which also covers the capacitor.
    Type: Grant
    Filed: August 12, 1980
    Date of Patent: January 25, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Setsuo Sasaki
  • Thermal pen tip
    Patent number: 4367395
    Abstract: A thermal pen tip comprising a heat reserve layer formed on an insulating substrate; a resistance layer for heating formed on said heat reserve layer; and a protective layer formed on said resistance layer, wherein said heat reserve layer has a convex top having a curvature and a flat surface on said convex top, so as to have a size corresponding substantially to a width of a line and said resistance layer for heating is formed on said flat surface of said heat reserve layer.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: January 4, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Yukio Asakawa, Katsuto Nagano, Syozo Sasa
  • Magnetic recording medium
    Patent number: 4367264
    Abstract: A magnetic recording medium has a substrate coated with a magnetic powder and a binder. The binder in said magnetic layer essentially consists of 15 to 45 wt. % of a polyester resin, 20 to 50 wt. % of an epoxy resin and 10 to 40 wt. % of nitrocellulose.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: January 4, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Akihiko Hosaka, Yukihiro Isobe, Kiyotaka Okuyama
  • Magnetic recording medium
    Patent number: 4367263
    Abstract: A magnetic recording medium comprises a first magnetic layer containing magnetite or a cobalt doped magnetite which is coated on a non-magnetic substrate; and a second magnetic layer coating a cobalt doped .gamma.-Fe.sub.2 O.sub.3 which is coated on said first magnetic layer.The magnetic recording medium has a high recording sensitivity, a high dynamic range, a less output fluctuation and especially superior sensitivity in low frequency band and superior maximum output level without a deterioration of transfer characteristics.
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: January 4, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Kawahara, Tadashi Nishimura, Masatsugu Funakoshi, Masaharu Nishimatsu
  • Magnetic tape cassette
    Patent number: 4365769
    Abstract: A magnetic tape cassette having a tape guide coated with nickel-tin alloy plating on the surface which is in slide-contact with a magnetic tape.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: December 28, 1982
    Assignee: TDK Electronic Co., Ltd.
    Inventor: Shigemasa Shoji
  • Process for producing magnetic powder having high coercive force
    Patent number: 4363831
    Abstract: A magnetic iron oxide powder which has high coercive force and stable magnetic characteristics is produced by forming a surface layer of the magnetic iron oxide powder which comprises a cobalt compound as a main component. The magnetic iron oxide powder is treated with an aqueous solution of a cobalt ion for two times or more to form at least two surfaces comprising the cobalt compound.
    Type: Grant
    Filed: September 26, 1980
    Date of Patent: December 14, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Shinji Umeki, Kazuo Takada
  • Magnetic tape cassette
    Patent number: 4363059
    Abstract: A magnetic tape cassette holding a wound magnetic tape comprising a transparent base film and a magnetic layer having a thickness of 5.mu. or less coated on the base film comprises a hole facing a light source for detecting the tape position, a hole facing a photosenser provided so as to form a light path passing to the hole for light source through which the magnetic tape is passed and a light-shielding filter having a light transmittance in the range between 0.5 and 10 percent placed in the light path.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: December 7, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Yoneo Matsuzawa, Yoshio Kawakami, Norifumi Kajimoto
  • Electric power source units
    Patent number: 4363088
    Abstract: The invention provides a novel electric power source unit such as a high-speed pulse power source unit built with a pulse-forming circuit and a DC electric power source unit built with a high-frequency voltage-multipler rectifying circuit having high performance in comparison with conventional units. The inventive unit comprises, as a part of the circuit, at least one ceramic capacitor composed of a ceramic dielectric body made of a strontium titanate-based composition unlike the conventional ones in the prior art comprising barium titanate-based ceramic capacitors. Four classes of the preferred compositions are disclosed each containing strontium titanate as the principal component.
    Type: Grant
    Filed: January 8, 1981
    Date of Patent: December 7, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hirotaka Yamamoto, Minoru Obara, Shinobu Fujiwara
  • Magnetic recording medium
    Patent number: 4361621
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer formed by using a magnetic composition comprising a binder and a magnetic powder adsorbing ricinoleic acid or an ester thereof.
    Type: Grant
    Filed: June 4, 1981
    Date of Patent: November 30, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Yukihiro Isobe, Kiyotaka Okuyama, Akihiko Hosaka, Hideo Kobayashi
  • Magnetic tape cassette
    Patent number: 4360173
    Abstract: A magnetic tape cassette includes a magnetic tape and two reels in a casing. The reel is formed by a reel substrate, a jaw and a tape clamping member. An exterior angle .alpha. between a prolonged line D.sub.1 of a contact surface of the reel substrate and an axial line E.sub.1 for dividing the tape clamping member into two half parts is less than 90 degrees.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: November 23, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Shigemasa Shoji
  • Rapid starter switch for a fluorescent lamp
    Patent number: 4360762
    Abstract: An improved starter switch which provides a rapid firing of a fluorescent lamp within 0.8 second has been found. An external appearance and the size of the present starter switch are almost the same as those of a prior glow switch which is slow to fire a fluorescent lamp, therefore, the present starter switch is replaceable to a prior glow switch by merely inserting the present starter switch to a socket of a prior glow switch. The present starter switch has a connector cap which is to be able to be engaged with a socket for a glow switch, a printed circuit board mounting circuit components and connected to said connector cap by lead lines, and a housing fixed to said cap and covering said printed circuit board.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: November 23, 1982
    Assignees: TDK Electronics Co., Ltd., Mitsubishi Denki Kabushiki Kaisha
    Inventors: Seiichiro Yamamoto, Hiromi Adachi, Shoichi Iwaya
  • Ultrasonic wave nebulizer driving circuit
    Patent number: 4359697
    Abstract: Positive feedback is applied from the piezo-electric vibrator in an ultrasonic nebulizer to the control electrode in the oscillator circuit for improved performance.
    Type: Grant
    Filed: August 21, 1981
    Date of Patent: November 16, 1982
    Assignee: TDK Electronics, Co. Ltd.
    Inventor: Minoru Takahashi
  • Cassette case
    Patent number: 4358071
    Abstract: A tape cassette formed from a cassette body having sections thereof which are adapted to be contacted by a tape and which have a surface roughness within the range of about 3 to 15 microns. In the production of such a cassette, those sections of the case which are adapted to be contacted by the tape are honed to provide a surface roughness within the specified micron range.
    Type: Grant
    Filed: May 20, 1980
    Date of Patent: November 9, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Masatoshi Okamura
  • Magnetic tape cassette
    Patent number: 4358070
    Abstract: A magnetic tape cassette comprises a tape running plane for a magnetic tape provided in the front of the casing assembly consisting of an upper half casing and a lower half casing, said magnetic tape being held in wound form and being capable of running inside the casing assembly and a front cover mounted to the casing assembly so as to open and close at the front of the assembly, said front cover being actuated by spring action in the direction closing the front part of the casing assembly by positioning one end of a coil spring fitted to the pivot pin in a rectangular groove formed in an inner surface of the upper half casing, wherein a rib having a slanted surface which is lowered toward said groove is provided at the side of said groove.
    Type: Grant
    Filed: December 3, 1980
    Date of Patent: November 9, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Masatoshi Okamura, Kimio Tanaka
  • Packaging container
    Patent number: D266829
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: November 9, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Keiichi Yoshizawa, Noboru Uemura