Hitachi, Ltd.

Hitachi Metals, Ltd.

Teizo Tamura

Noriyuki Kumasaka

Hideo Fujiwara

Mitsuhiro Kudo

Kuniaki Miura

Yoshihiro Shiroishi

Akira Shibata

Takeshi Kimura

Takeo Yamashita

Noboru Kojima

Kiminari Shinagawa

Keiichi Komatsu

Makoto Konosu

Toshio Ogawa

Osamu Ito

Fumio Tajima

Kunio Miyashita

Akira Ikegami

Yoshinori Okada

Hiroshi Katayama

Isao Fukushima

Mitsuru Hasegawa

Shigekazu Otomo

Takao Terayama

Kazuo Sakai

Koichi Hirose

Tsutomu Iimura

Hideo Zama

Kouichi Saito

Nobuyuki Sugishita

Tadamichi Asai

Takao Kobayashi

Kenichi Hironaka

Nobuo Kobayashi

Mituru Fujii

Akira Tamura

Yasuji Moriyama

Yosimi Sekita

Takuro Kawano

A substrate for hybrid IC which comprises a substrate, a thick film resistor containing glass, formed on the substrate, and a thick film conductor at the terminal of the thick film resistor, where a means for preventing diffusion of the glass from the thick film resistor into the thick film conductor is provided between the thick film resistor and the thick film conductor has a stable resistance as a thick film microresistor and is applied to various uses such as cellular radio communication system.

Substrate for hybrid IC, hybrid IC using the substrate and its

Disclosed is a rotary magnetic head device for a magnetic recording/reproducing apparatus including image signal transmitters. A dynamic pressure type bearing is provided on one of a rotary member and a stationary member, for generating a dynamic pressure to maintain a gap between the signal transmitters constant.

Rotary magnetic head device for magnetic recording/reproduction apparatus

A permanent magnet electric machine such as, for example, a motor or generator, including a permanent magnet field member, an armature having salient magnetic poles and armature windings. A greatest common division of the number of magnetic poles of the field member and the salient magnetic poles having the armature windings differs from the number of magnetic poles. A group of grooves is formed between the salient magnetic poles having an interval of 2/3M.pi., with M being an integer which is not a multiple of three. To reduce the occurrence of cogging torque, auxiliary grooves are provided on the surface of the salient poles at positions which are spaced apart from positions of the grooves by (.pi./3)K+(.pi./6), in terms of electrical angle, with K being an integer.

Permanent magnet electrical machine with reduced cogging

In a video tape recorder of the helical scan type, a pair of rotary magnetic heads for the audio signal are provided in addition to the rotary video heads so that the audio signal is recorded on the same slant track as of the video signal on a multiplex basis. The audio head pair is provided with an azimuth angle with opposite polarities from each other and different in value from that of the video head pair. The system has a first operation mode of the standard tape speed and a second operation mode in which the tape is fed at a speed, for example, 1/3 the standard tape speed. The audio and video head pairs are disposed on lines intersecting at right angles with an offset of T.sub.1 /2+T.sub.1 provided in the axial direction of rotation between the two magnetic head pairs, where T.sub.1 is the track pitch of the recording track formed on the tape in the second operation mode. The system produces overlapping tracks for the audio and video signals on the magnetic tape. In the first operation mode, the recording track is formed by a combination of magnetic heads providing an increased difference of azimuth angles between the audio and video heads, while in the second operation mode, the track is formed by a combination of magnetic heads providing a decreased difference of azimuth angles between the audio and video heads.

Multiplex magnetic recording and reproduction system

A magnetic recording and reproducing apparatus comprises a magnetic head having magnetic cores in which at least portions thereof in the vicinity of a gap are made of M.sub.n -Z.sub.n ferrite single crystal and planes of the magnetic cores forming a principal magnetic circuit are formed by {110} planes of the ferrite and &lt;100&gt; directions contained in the {110} planes are inclined to a surface facing a magnetic recording medium, and means for relatively moving the magnetic recording medium in an opposite and parallel direction to a projection vector on said surface facing said recording medium, of a vector directed from a site far from the surface facing the magnetic recording medium to a site near said surface in the &lt;100&gt; direction projected on the surface facing the magnetic recording medium. The present magnetic recording and reproducing apparatus exhibits both high wear resistance and excellent read/write characteristic.

Magnetic recording and reproducing apparatus

A picture reproducing apparatus for a helical scanning video tape recorder including an impedance transformer; a video head connected to the input of the impedance transformer; a resonance circuit connected to the output of the impedance transformer; a pre-amplifier connected to the output of the resonance circuit; a feedback resistor connected between the junction of the pre-amplifier and resonance circuit and the output of the pre-amplifier; and an output terminal connected to the output of the pre-amplifier. The impedance transformer has the output impedance four times as high as the input impedance thereof.

Picture reproducing apparatus in a helical scanning video tape recorder

A record/reproduce circuit for VTR comprising two normal reproducing heads with different azimuth angles, a special reproducing head with the same azimuth angle as that of the one normal reproducing head, a rotary transformer through which signals from these heads are supplied to a static circuit section, a change-over means for alternately switching a signal from the special reproducing head and a signal from the other normal reproducing head with a different azimuth angle from that of the special reproducing head, a feedback type preamplifier for amplifying the output of the change-over means, and another feedback-type preamplifier for amplifying a signal from the normal reproducing head with the same azimuth angle as that of the special reproducing head.

Record/reproduce circuit for VTR

A magnetic head having a magnetic core formed by facing a pair of magnetic substances through a working gap at a head section confronting a magnetic recording medium is disclosed in which at least one of the magnetic substances has magnetic anisotropy, and an angle .alpha. (in a C-shaped core half) and/or an angle .alpha.' (in an I-shaped core half) between a core surface confronting the magnetic recording medium and a direction having a maximum magnetic permeability in a main magnetic circuit plane of the magnetic substance having magnetic anisotropy is made larger than an orientation angle of the above direction for making minimum the magnetic reluctance of the main magnetic circuit of the magnetic core by .beta. (for .alpha.) and/or .beta.' (for .alpha.') to improve the recording/reproducing characteristic of the magnetic head, where .beta. is given by a formula ##EQU1## is equal to or less than 25.degree., D indicates a depth of the working gap, L* indicates an effective length of an oblique part for forming the working gap, and min [a, b] indicates the smaller of a and b.

Magnetic head

A magnetic head which uses single crystal Mn-Zn ferrite containing up to 7% by weight of SnO.sub.2 occluded therein without being allowed to separate and which has such a construction that glass having a contraction rate lower than that of ferrite is filled in the narrowed portion near the gap, the plane forming the principal magnetic circuit of the core is allowed to coincide with the {110} plane of the ferrite and an angle .theta. between the &lt;100&gt; direction inside the {110} plane of the ferrite and the gap-forming plane is from 5.degree. to 40.degree. or 85.degree. to 120.degree.. The magnetic head having such a construction has a reduced modulation noise and extremely excellent write-and-read characteristics.

Growing community of inventors

Katsuta, Japan

Teizo Tamura