Yamaha Corporation

Masuhiro Okada

Kunio Hiyama

Hiroyuki Yamashita

Shuichi Sawada

Toshiharu Fukushima

Tatsuya Hiraku

Yukitoshi Suzuki

Yasutaka Nakamura

Emiko Suzuki, Legal Representative

Masao Imanishi

Nanayuki Takeuchi

Akira Kaneko

Eizi Abe

Toshihari Fukushima

Kaoru Hashimoto

Kaoru Yoshioka

A drum pad has a knitted material that is strechable and has a top surface to be beaten by a stick and a rear surface opposite to the top surface, a resin member that is strechable and thinner than the knitted material and that is capable of being thermally fused and bonded to the knitted material, and a rubber. The drum pad is formed of a first layer portion, a second layer portion, and a body portion. The first layer portion is formed in a region of the knitted material including the top surface thereof but not including the rear surface. The body portion is formed of the rubber. The second layer portion is formed in a remaining region of the knitted material other than the first layer portion and formed between the body portion and the first layer portion.

Drum pad and manufacturing method thereof

In order to provide a sound-absorbing body which has both a thin thickness and improved sound-absorption characteristics with regard to a low tone range sounds, the sound-absorbing body () includes: an organic hybrid sheet () constituted from an organic low-molecular material which is spread in a matrix polymer; and a gastight air cell () which is closely provided at a backside () of the organic hybrid sheet, wherein the organic hybrid sheet indicates both a sound-absorption peak of a random incidence sound-absorption coefficient at a frequency band of 400 Hz or lower and another sound-absorption peak when the organic hybrid sheet is vibrated by applying air vibration caused by sound, because of adhering the organic hybrid sheet to the gastight air cell.

Sound absorbing body

A microreactor comprises a reaction chamber, into which prescribed materials are introduced, a production chamber, and a channel for connecting the reaction chamber and the production chamber together. A plurality of temperature adjusting devices (e.g., Peltier elements), each of which can be independently controlled in temperature, are arranged at prescribed positions with prescribed distances therebetween on a substrate in proximity to the reaction chamber, the production chamber, or the channel. Herein, the reaction chamber causes reaction of the materials in response to differences of boiling points, differences of state changes, or difference of solubility, thus producing a new substance, which is transmitted from the reaction chamber to the production chamber via the channel while being adequately controlled in temperature.

Microreactor and substance production method therewith

A surface acoustic wave device (e.g., filter or convolver) is designed to increase an electromechanical coupling factor K and is basically configured by a substrate, a buffer layer, a piezoelectric layer and an electrode layer. Herein, the substrate is made of a bulk material (e.g., SrTiO ), which allows growth of a perovskite compound crystal being expressed by a general chemical formula of SrZO (where Z denotes an element such as Zr and Sn whose valence is 4). The buffer layer is formed on the substrate and is made of the perovskite compound crystal (e.g., SrZrO , SrSnO ), which has good lattice matching with KNbO . The piezoelectric layer is made of a KNbO single crystal and is formed on the buffer layer with a thickness of 500 nm or so. The electrode layer is formed on or below the piezoelectric layer. An interdigital transducer consisting of input and output electrodes is formed by patterning using photolithography technique being effected on the electrode layer, which is made of a metal material (e.g., Al). In addition, it is possible to form a temperature stabilization layer between the piezoelectric layer and electrode layer. The temperature stabilization layer is made of a material (SiO ) having a temperature coefficient reverse to a temperature coefficient of the piezoelectric layer so as to ease distortion being caused to occur due to differences in thermal expansion between the piezoelectric layer and electrode layer. Incidentally, the temperature stabilization layer has a prescribed thickness, which is approximately 1000 nm.

Surface acoustic wave device

The present invention provides a carbon-fiber reinforced thermoplastic resin (CFRTP) having excellent adhesion between a carbon fiber, used therein as a reinforcing material, and a thermoplastic resin, used therein as a matrix. A carbodiimide agent is employed in order to achieve the above object. By the present invention, the carbodiimide agent is adhered to a carbon fiber for a reinforcing material, and the thus-treated carbon fiber is combined with a matrix thermoplastic resin; or the carbodimide agent is mixed with a matrix thermoplastic resin, and the mixture is combined with a carbon fiber for a reinforcing material. The carbodiimide agent enhances adhesion between the carbon fiber and the matrix thermoplastic resin. Accordingly, superior mechanical properties of the carbon fiber is sufficiently exploited in the CFRTP produced according to the present invention; therefore, the CFRTP of the present invention is an excellent composite material having superior mechanical strength.

Carbodiimide treated carbon fiber and use thereof

In the production of a hollow FRP article such as a wood type carbon black golf club head, a hollow resin shell is formed via blow molding, heat-resistant fine particles are filled as a filler into the interior of the resin shell, the interior of the resin shell is decompressed to form an inner mold, the inner mold is covered with FRP prepreg including thermoplastic resin to form a prepreg composite, the prepreg composite is heated in a metallic mold under pressure and the fine articles are removed after demolding. A golf club shaft is formed by heating a mandrel, applying thermoplastic resin powder to the mandrel and then winding a lamellar prepreg around the mandrel to thereby form a hollow shaft. A golf club is formed from a head and shaft formed as described above by enlarging the end of the shaft, placing the shaft and the head in a mold and heating the mold under pressure.

Growing community of inventors

Kikugawa, Japan

Masuhiro Okada