Nippon Gakki Seizo Kabushiki Kaisha

Yamaha Corporation

Kenzaburo Iijima

Toshiharu Hoshi

Yoshinori Hayashi

Masayuki Takamura

Takeo Sata

Tomoo Yamagishi

Nobuji Kato

Katsufumi Kondo

Kazumoto Asano

Kazuo Kurahashi

Atsushi Tsuchida

Mutsumi Harada

Kazuhiro Tsuchiya

Aritsune Matsuo

Norio Fukuda

Tekeo Sata

In construction of a wood club head having a main body of a hollow metallic shell construction, the face thickness is limited to 2 to 4 mm and the entire head volume is limited to 190 cc or larger for enlargement of its sweet spot. The enlarged sweet spot assures a long flying distance of a ball in an intended direction through its improved mating with the ball at the very moment of striking.

Hollow metal alloy wood-type golf head

An electric guitar has a plurality of strings stretched over a rigid body and a neck, and a vibration detecting unit embedded into the rigid body, and the vibration detecting unit has a plurality of photo emitting elements paired with a plurality of photo detecting elements spaced apart from the associated photo emitting diodes in directions parallel to the associated strings, wherein the photo emitting elements radiate light spots toward the associated strings for causing the reflections to be fallen upon the associated photo detecting elements so that the photo detecting elements produces photo currents without any diffraction of light.

Electric stringed musical instrument equipped with detector optically

To construct a magnetic recording medium to be used for an encoder adapted for detection of an angular or linear displacement of a mobile object such as a robot arm, a substrate is at least partly covered with a Sm-Co alloy thin layer bearing magnetic information with a magnetization pitch which is at least three times as large as the crystal diameter of the magnetic particles in the alloy. A resultant high coercive force obtained with that alloy allows detection with an enlarged detective distance, and the above-mentioned proper ratio of crystal diameter with respect to the magetization pitch allows detection with low percentage of output variation, thereby enabling easy assembly of the encoder and detection with high precision.

Magnetic recording medium for encoders

An iron type golf club head includes a head body constituted by a blade portion, a sole portion, and an impact surface portion. At least the impact surface portion of the head body is constituted by a thin plate consisting of a thermoelastic type martensite transformation alloy. The thickness of the impact surface portion is set in the range of 1.0 to 5.0 mm, and is smaller than that of each of the blade and sole portions of the head body.

Iron type golf club head

A video recording apparatus used for a television system and the like writes video information on a track formed on a recording medium in a writing direction which directs from a predetermined start position to a predetermined end position of track by use of a head. Thereafter, the video information is read from a desirable designated positon of the track in the writing direction. The read video information is reproduced and then its corresponding pictures are displayed on a display unit of the television system. This video information is not outputted from the recording medium in a period while the head returns to the predetermined start position of the track after the video information at the predetermined end position of the track is read out. So, this video recording apparataus can provide a memory which stores the video information and then outputs the video information during such period. Thus, the video information can be continuously obtained. Preferably, the recording medium is constructed by an optical disk or an magneto-optical disk, the memory is constructed by a semiconductor memory such as a random-access memory (RAM), and the predetermined start and end positions are innermost side and outermost side of the track.

Video recording apparatus having control means provided therein for

In production of a permanent magnet by forming a roll of an elongated magnetic metal strap, a strap made from a spinodal decomposition type magnetic alloy is subjected, at least before formation into a roll, to age-hardening under concurrent magnetization in order to obtain a magnet having significant radial magnetic anisotropy well suited for use in sound systems such as loudspeakers.

Method for producing a magnet with radial magnetic anisotropy

Mono-directional magnetic anisotropy given to a Fe-Cr-Co straight tube by initial heat magnetization is converted into radial magnetic anisotropy by subsequent formation of one or more flange sections through plastic deformation which is perpetuated by final age-hardening in order to obtain an excellent configuration magnet well suited for electro-acoustic converters.

Method for producing anistropic configuration magnet

Anistropic configuration magnet

An extremely thin highly magnetic layer is formed on one surface side only of an age-hardening type magnet alloy film by local age-hardening after solution treatment for the purpose of high density recording without any process difficulties.

Method for producing a magnetic tape

Magnetic tape

In a metal-insulator alternate type multilayer head core usable for magnetic sound recording and reproducing, metallic component layers are connected to each other via one or more metallic interconnecting layers passing locally through insulating component layers in order to provide high effective permeability with minimized eddy current loss. In manufacturing, a metal-insulator alternate type multilayer construction including the metallic interconnecting layer or layers is subjected to sintering in order to avoid intermetal separation which might be otherwise caused by cracking in the insulating layers.

Method for manufacturing multilayer head core

A number of extremely thin magnetic plates advantageously used for head cores are formed at one time by subsequent application of pressing, sintering, peripheral cutting and separating to a green multilayer construction which includes alternately superimposed metallic powder and parting agent layers, the former resulting in the magnetic plates. High yield is obtained with trouble-free process while making the best use of hard-to-work materials such as Fe-Al-Si type alloys which in general have excellent magnetic properties.

Method for manufacturing extremely thin magnetic plates for

In manufacturing of lamina used for components for magnetic heads such as head cores and shield casings, powder metallurgy is applied to powder material of a permalloy alloy composition in combination with later-staged rolling. Addition of at least one easily oxidizable element is preferably combined with formation of the material powder by means of atomization, more preferably followed by annealing within a reducing atmosphere. Measured formation of oxidized shells on powder particles assists uniform and smooth dispersion of smashed shell flakes into the lamina, thereby greatly raising abrasion resistance of the product without lowering the magnetic properties.

Method for manufacturing components for magnetic heads of increased

In a metal-insulator alternate type multilayer head core usable for magnetic sound recording and reproducing, metallic component layers are connected to each other via one or more metallic interconnecting layers passing locally through insulating component layers in order to provide high effective permeability with minimized eddy current loss. In manufacturing, a metal-insulator alternate type multilayer construction including the metallic interconnecting layer or layers is subjected to sintering in order to avoid intermetal separation to be otherwise caused by cracking in the insulating layers.

Multilayer magnetic head core

Cladding materials in a substantially powdery state are laminated with a base material in a substantially solid state by compaction under static fluid pressure and thermal treatment for causing sintering of the cladding materials and mutual diffusion at the borders between the cladding material and the base material. The advantages and disadvantages of the component materials compensate each other.

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Hamamatsu, Japan

Kenzaburo Iijima