Yamaha Corporation

Nippon Gakki Seizo Kabushiki Kaisha

Takeo Sata

Masayuki Takamura

Kenzaburo Iijima

Toshiharu Hoshi

Kenzaburou Iijima

Tomoo Yamagishi

Nobuji Kato

Katsufumi Kondo

Norio Shinoda

Masataka Hatae

Norio Fukuda

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

A rare earth magnet article of the Fe-B type is provided herein characterized by consisting essentially of the three rare earth elements Nd-Pr-Ce in combination within defined atom ratios of each in the formula:

FE-B magnets containing Nd-Pr-Ce rare earth elements

In production of rare earth type magnet, addition of Nd to Fe-Gd-metalloid base containing 2 or more of B, Si, and P, combined with solidification of molten alloy by abrupt cooling assures large coercive force and high susceptibility of the product.

Rare earth type magnet and a method for producing the same

In production of so-called anisotropic fine grain type hard magnetic material, particles of highly magnetic substance powder are each plated with nonmagnetic substance before compaction, sintering and plastic deformation in order to provide the product with stable magnetic characteristics for reduced production cost.

Process for producing hard magnetic material

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

Through employment of a core-and-sheath construction having a number of axially elongated indentations along the border for the billet with the core of an easily soluble material, extrusion such as hydrostatic extrusion can advantageously be utilized for production of heat pipes with enhanced precision and operational efficiency in process. Indentations, which work as a wick in the heat pipe, may be provided by forming axially elongated grooves either in the inner peripheral surface of the sheath or in the outer peripheral surface of the core.

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Hamamatsu, Japan

Takeo Sata