Patents Assigned to Hitachi Metals, Inc.
  • Patent number: 7939938
    Abstract: A packaging structure for hermetically sealing a functional device by solder connection at a wafer level in which a first Si substrate having a concave portion metallized on its internal surface and a second Si substrate metallized at a position opposed to said concave portion are used, the metallization applied to the internal surface of the concave portion of the first Si substrate and the metallization applied to the second Si substrate at the position opposed to the concave portion are connected by molten solder to hermetically seal the functional device between the first Si substrate and the second Si substrate, whereby the wettability of the solder for the two Si substrates is improved, the bondability between the Si substrates is enhanced, and the yield at which the package is manufactured is improved.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: May 10, 2011
    Assignee: Hitachi Metals, Inc.
    Inventors: Shohei Hata, Naoki Matsushima, Eiji Sakamoto, Ryoji Okada, Takanori Aono, Atsushi Kazama, Toshiki Kida
  • Patent number: 5926677
    Abstract: An image forming method for developing an electrostatic latent image on an image-bearing member that moves bearing electrostatic latent images formed of a two-component magnetic developer is described. The method includes the steps of providing a rotatable cylinder for supporting and conveying said magnetic developer, the cylinder including a permanent magnet with a plurality of magnetic poles provided on the surface. Magnetic carriers in the magnetic developer are attracted and conveyed on the surface of the permanent magnet, the magnetic carriers having an average particle size of 5 to 20 .mu.m and opposite to toner in polarity of charge. A carrier particle magnetization .sigma..sub.1000 in a magnetic field of 1000 Oe so as to amount to 50 emu/g or less is also used. The method also includes a surface magnetic flux density ranging from 50 to 1200 G, and a value of h, defined as .pi.D.multidot.Vp/(M.multidot.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: July 20, 1999
    Assignee: Hitachi Metals, Inc.
    Inventors: Masahisa Ochiai, Masumi Asanae, Toshihiko Noshiro, Koji Noguchi
  • Patent number: 5390014
    Abstract: A light weight, portable electrophotographic printer having an image-forming unit which includes a cylindrical latent image bearing member, a device for forming the latent image, a developing device equipped with a developing roll onto which is attracted a non-magnetic one-component developer or a two-component developer containing a magnetic carrier and non-magnetic or slightly magnetic toner. The printer also has a device for transferring the developed image on the surface of the latent image-bearing member onto a recording medium, a device for cleaning the surface of the latent image-bearing member after transferring the developed image, and a device including rollers located downstream of the latent image-bearing member for heat-fixing the developed image onto the recording medium.
    Type: Grant
    Filed: June 24, 1993
    Date of Patent: February 14, 1995
    Assignee: Hitachi Metals, Inc.
    Inventors: Masumi Asanae, Katsutomo Ohmika
  • Patent number: 5143560
    Abstract: A method for the high volume manufacture of Fe-B-R-T alloy powders without sacrificing the resultant magnetic properties (such as intrinsic magnetic coercivity) of the alloy involves hydrogen decrepitation of vacuum cast or die-upset billets of the alloy. Hydriding is carried out at a partial pressure of hydrogen of between 250 and 760 mm Hg at 100.degree. to 500.degree. C. for 30 minutes to 6 hours or longer, depending upon load size. Dehydriding occurs in a vacuum below 10.sup.-2 mm Hg or in an inert atmosphere possessing a partial pressure of hydrogen below 10.sup.-2 mm Hg. The alloy powder is preferably incorporated in matrix or composite magnets by the addition of a binder prior to pressing and orienting. The binder may set during pressing in a hot die, or by heating after pressing in a cold die.
    Type: Grant
    Filed: April 20, 1990
    Date of Patent: September 1, 1992
    Assignee: Hitachi Metals, Inc., Ltd.
    Inventor: Manfred Doser
  • Patent number: 5114503
    Abstract: A magnetic core comprised of an amorphous alloy ribbon wound into a toroidal shape, wherein the said amorphous alloy has a composition of the formula:(Co.sub.1-x-y-z Fe.sub.x Ni.sub.y Mn.sub.z).sub.100-a-b-c M.sub.a Si.sub.b B.sub.cwherein M is at least one element selected from the group consisting of Nb, Cr and Mo, and x, y, z, a, b and c are numbers which satisfy relations of 0<a.ltoreq.6, 13.ltoreq.b.ltoreq.16, 7.ltoreq.b.ltoreq.10, 0<x.ltoreq.0.1, 0.ltoreq.y.ltoreq.0.2 and 0.ltoreq.x.ltoreq.0.13 respectively, said amorphous alloy after heat treatment having a rectangular ratio Br/Bs of at least 80%, a Bs value in a range of 5 KG to 8 KG and a stress relief ratio of at least 75%.
    Type: Grant
    Filed: March 24, 1987
    Date of Patent: May 19, 1992
    Assignee: Hitachi Metals, Inc.
    Inventors: Yoshihito Yoshizawa, Kiyotaka Yamauchi
  • Patent number: 4768458
    Abstract: A method of manufacturing an amorphous metal sheet or ribbon which comprises extruding a molten metal from an orifice of a nozzle and directing the extruded molten metal onto a moving chill surface to rapidly cool and solidify the metal thereby forming said sheet or ribbon; said orifice being a rectangular slit defined by side walls and a front lip and a back lip arranged in front and behind the slit in the direction of movement of the chill surface below said nozzle; said chill surface moving a speed of 10 m/sec to 50 m/sec and being spaced from the front lip by a gap length of from 100 .mu.m to 600 .mu.m and the width W.sub.F of the front lip measured in the direction of movement of the chill surface being represented by the relationship W.sub.F .ltoreq.W, wherein W represent the width the slot in the nozzle.
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: September 6, 1988
    Assignee: Hitachi, Metals Inc.
    Inventors: Shunsuke Arakawa, Yoshizo Sawada
  • Patent number: 4721153
    Abstract: A compound roll for rollng composed of a shell made of high-chromium cast iron and a core made of cast or forged steel. The shell has a large residual compressive stress. The high-chromium cast iron shell has a composition by weight of 2.0-3.5% C, 0.5-1.5% Si, 0.4-1.5% Mn, 8-25% Cr, 0.5-3.0% Mo, 1.5% or less Ni and the balance being essentially Fe for hot rolling, and 2.5-3.5% C, 0.5-1.5% Si, 0.4-1.5% Mn, 0.5-3.0% Ni, 8-25% Cr, 1.0-5.0% Mo and the balance being essentially Fe for cold rolling. The shell's Shore hardness is 70 or more for hot rolling and 90 or more for cold rolling, and the core's tensile strength and elongation are 55 kg/mm.sup.2 or more and 1.0% or more, respectively. The residual compressive stress of the shell is 20 kg/mm.sup.2 or more and serves to prevent cracks from penetrating into the depths of the shell, thereby preventing spalling effectively. This compound roll can be manufactured by a shell casting method.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: January 26, 1988
    Assignee: Hitachi Metals, Inc.
    Inventors: Yoshikazu Sano, Michio Haga, Toshio Okitsu
  • Patent number: 4628387
    Abstract: A magnetic head assembly for writing on and reading out data or signals from a magnetic medium such as a floppy disc, having a read-write magnetic head and eraser magnetic heads in combination. Control of the depth of the eraser gap in this magnetic head assembly is accomplished not by the eraser magnetic head core, but by the read-write magnetic head core.
    Type: Grant
    Filed: February 8, 1983
    Date of Patent: December 9, 1986
    Assignee: Hitachi Metals, Inc.
    Inventor: Shinji Furuichi
  • Patent number: 4604042
    Abstract: A mold for producing an anisotropic magnet from a composition essentially consisting of magnetic powder and a binder, a mold body, a cavity for molding the composition in the presence of an anisotropically oriented magnetic field produced by a plurality of first magnets for providing magnetic fluxes for the magnetic field in the cavity, yokes, each provided between the cavity and the first magnets, and second magnets provided on both circumferential sides of the yokes for preventing the leakage of the magnetic fluxes. The first and second magnets are made of permanent magnets such as rare earth cobalt magnets. The mold may be provided at both ends with third magnets for preventing the axial leakage of the magnetic flux from the axial ends of the yokes. Two or more molds may be combined in a single molding apparatus while sharing the first magnets. This mold is suitable for the injection, extrusion or insert molding of bonded magnet rolls, motor rotors, etc.
    Type: Grant
    Filed: June 7, 1984
    Date of Patent: August 5, 1986
    Assignee: Hitachi Metals, Inc.
    Inventors: Shigeho Tanigawa, Shuichi Shiina, Kimio Uchida
  • Patent number: 4176539
    Abstract: A cold-roll forming stand for forming a flat metal strip into a desired section which includes a pair of upper and lower forming rolls for forming the metal strip lengthwise; a pair of intermediate longitudinal forming rolls for bending or curving the metal strip widthwise are mounted on intermediate vertical shafts, a pair of front longitudinal forming rolls mounted on vertical shafts upstream of the pair of intermediate longitudinal forming rolls and a pair of rear longitudinal forming rolls are mounted on vertical shafts downstream of the pair of intermediate longitudinal forming rolls, whereby the metal strip is subjected to the bending and/or curving lengthwise by the pair of upper and lower forming rolls and widthwise by the front, intermediate and rear pairs of longitudinal forming rolls.
    Type: Grant
    Filed: March 16, 1978
    Date of Patent: December 4, 1979
    Assignee: Hitachi Metals, Inc.
    Inventors: Takeshi Sawada, Takeshi Inoue