Yamaha Corporation

Nikkiso Company Limited

Minoru Harada

Yuichiro Suenaga

So Tanaka

Masanori Niiyama

Yoshitaka Noguchi

Yuichirou Suenaga

Syuzo Kurokawa

An electronic musical instrument is equipped with plural series combinations of switches and resistors and a piezoelectric transducer associated with a movable member for producing electric signals representative of player's intentions to music sound to be generated, and a signal processing system processes the signals for generating the music sound; the signal processing system has a voltage discriminator so that the plural series combinations are connected in parallel to the voltage discriminator through a single conductive line; a vibration absorber is inserted between the movable member and the piezoelectric transducer so that the piezoelectric transducer exactly converts the motion of the movable member to the electric signal at each player's manipulation.

Simple electronic musical instrument, player's console and signal processing system incorporated therein

An electronic drum system includes an electronic drum having a shell, a drum head stretched across an opening of the shell, a vibration sensor converting vibrations of the drum head to an electric signal and a damper held in contact with the reverse surface of the drum head; when a drummer strikes the drum head with a stick, the drum head is shaken, and vibrations follow; the damper is held in contact with a certain area on the reverse surface, and the shake and vibrations are propagated from another area free from the damper to the vibration sensor; the shake is surely propagated to the vibration sensor, and the vibrations are rapidly decayed; for this reason, the vibration sensor exactly discriminates the shake from the peaks of the vibrations, thereby preventing an electronic sound generator from unintentionally repeated electronic beats.

Electronic percussion system and electronic percussion instrument incorporated therein

An electronic percussion instrument has a covering section 7A for covering the rim switch 5 on the outer periphery of a pad member 7 and a switch compression section 13 and two grooves 14 are provided on the back surface of the covering section 7A. In the switch compression section 13, a pressing surface 13a is made into a curved surface protruding towards the rim switch 5. The result is that striking forces for pressing the rim switch 5 are concentrated on the switch compression section 13 so as to enable to reliably and effectively transmit the forces to the rim switch 5 by elastic deformation of the switch compression section 13, regardless of the hitting direction of the drumstick on the rim section.

Electronic percussion instrument

An electronic cymbal (10) has a first cymbal unit (12) for normal playing and a second cymbal unit (13) for cup playing which are vertically separated and attached to a common instrument holder (11). The second cymbal unit (13) of a smaller size than the first cymbal unit (12) is positioned above the first cymbal unit (12) with an intervening felt washer (22). Transducers (15, 19) are provided on the back surface of respective cymbal units (12, 13).

Electronic cymbal instrument

A secondary battery with a negative electrode having an anode active material, a positive electrode, and a non-aqueous electrolyte, has its anode active material provided with vapor-grown and graphitized carbon fibers having a mean fiber diameter of 5 .mu.m or smaller, a mean length of 90 .mu.m or shorter, a mean aspect ratio of from 1 to 18, and a spin density of 8.times.10.sup.18 spins/g or less, when measured by the electron spin resonance absorption method.

Vapor-grown and graphitized carbon fibers process for preparing same

There are disclosed vapor-grown and graphitized carbon fibers capable of forming composite materials having the vapor-grown and graphitized carbon fibers contained at a high packing density and forming molded members consisting substantially solely of the vapor-grown and graphitized carbon fibers, a process for the preparation of the vapor-grown and graphitized carbon fibers, the molded member, and the composite member. The vapor-grown and graphitized carbon fibers have a mean fiber diameter of 5 .mu.m or smaller, a mean fiber length of 90 .mu.m or shorter, a mean aspect ratio of from 1 to 18, and a spin density of 8.times.10.sup.18 spins/g or less, when measured by the electron spin resonance absorption method. Such vapor-grown graphitized carbon fibers are prepared by graphitizing the vapor-grown carbon fibers at 2,000.degree. C. or higher and then fracturing them by applying a high impact thereto. The molded members can be formed, for example, by hydrostatic pressure-isotropic pressure molding techniques, The composite members can be prepared by compounding the vapor-grown and graphitized carbon fibers with the matrix.

Vapor-grown and graphitized carbon fibers, process for preparing same,

A pad member of an electric percussion instrument is supported through a cushion member by a case member for isolating the pad member from noise produced in the case member upon strikes of the pad member, and a vibration sensor is connected with the pad member by means of a sensor board of vibration transmissive substance so as to propagate the vibrations of the pad member to the vibration sensor without any influence of the noise.

Growing community of inventors

Shizuoka, Japan

Minoru Harada