Abstract: A laminated plyboard for a musical instrument which reduces a loss of vibration energy due to internal friction while securing high rigidity with inexpensive cost. A laminated plyboard 20 comprises a first layer portion S1 including layers 24 and 25, a second layer portion S2 including layers 26 and 27, and an impregnated layer 21 impregnated with phenol and sandwiched between the first layer portion S1 and the second layer portion S2. A rigidity coefficient of the impregnated layer 21 is higher than rigidity coefficients of the layers 24 to 27 that configure the first layer portion S1 and the second layer portion S2.

Abstract: A laminated plyboard for a musical instrument which reduces a loss of vibration energy due to internal friction while securing high rigidity with inexpensive cost. A laminated plyboard 20 comprises a first layer portion S1 including layers 24 and 25, a second layer portion S2 including layers 26 and 27, and an impregnated layer 21 impregnated with phenol and sandwiched between the first layer portion S1 and the second layer portion S2. A rigidity coefficient of the impregnated layer 21 is higher than rigidity coefficients of the layers 24 to 27 that configure the first layer portion S1 and the second layer portion S2.

Abstract: In an acoustic sheet which can be used as a head material of a percussion instrument or a head material for a sound box of a string instrument, a plurality of change regions having a crystalline orientation different from a base are dispersed into the base made of a synthetic resin sheet having a uniform crystalline orientation. The acoustic sheet can include a delamination which is formed by delaminating the synthetic resin sheet in a thickness direction.

Abstract: A drum shell is constituted of at least one laminate wood in which at least one fiber-reinforced layer (e.g. a carbon fabric) is inserted between two wooden materials via the adhesive and which is rolled up in a cylindrical shape. By setting the mass per unit area of the fiber-reinforced layer ranging from 5 g/m2 to 75 g/m2, it is possible to prevent the detachment of fibers inside the fiber-reinforced layer while controlling the shearing loss with respect to the laminate wood. The drum shell is equipped with at least one drumhead so as to produce a drum with a high sound quality and with a fine-grained exterior appearance.

Abstract: A drumhead for use in a percussion instrument is composed of multiple (e.g., two or three) plies of synthetic resin films, which are laminated together and are brought into close contact with each other when stretched across the opening of a hollow cylinder of a drum, for example. At least one air evacuation hole is formed at the center of the backside synthetic resin film or in proximity to the center of the backside synthetic resin film. Therefore, when the drumhead is stretched outwardly along a diameter direction of the opening of the hollow cylinder of the drum, remaining air between the films can be reliably evacuated from the air evacuation hole towards the exterior of the drumhead. Thus, it is possible to reduce unwanted loss in transmission of vibration between the films of the drumhead when beaten; hence, it is possible to realize good sound quality in the drum.

Abstract: A percussion instrument head is composed of a synthetic resin film (e.g., a PET film) having a prescribed thickness, which is subjected to chemical etching using a prescribed solution (e.g., an alkali solution), thus processing at least one surface thereof to be rough. Irregularities are formed in substantially uniform sizes and dimensions on the rough surface of the film, wherein hydrolysis processing advances firstly on the surface of the film, which are gradually dissolved or decomposed. Thus, it is possible to simulate the exterior appearance and flexibility of the conventional natural-leather head, and it is possible to produce sharp and articulated sounds having balanced pitches (or intervals) when playing the percussion instrument head composed of the synthetic resin film, which can simulate the property of sound of the conventional natural-leather head. After completion of chemical etching, the film is coated with an epoxy resin, for example.

Abstract: An acoustic wire for a drum comprising a single long wire made of metal, resin, etc. and strung in a plurality of turns between a pair of supporting members. The single long wire in the form of a plurality of parallel acoustic wires comes into contact with the drum head when the supporting members are moved toward the drum head. The acoustic wire provides a long attenuation time of the vibration of the acoustic wire and large quantity of sound.

Abstract: A percussion instrument head is composed of a synthetic resin film (e.g., a PET film) having a prescribed thickness, which is subjected to chemical etching using a prescribed solution (e.g., an alkali solution), thus processing at least one surface thereof to be rough. Irregularities are formed in substantially uniform sizes and dimensions on the rough surface of the film, wherein hydrolysis processing advances firstly on the surface of the film, which are gradually dissolved or decomposed. Thus, it is possible to simulate the exterior appearance and flexibility of the conventional natural-leather head, and it is possible to produce sharp and articulated sounds having balanced pitches (or intervals) when playing the percussion instrument head composed of the synthetic resin film, which can simulate the property of sound of the conventional natural-leather head. After completion of chemical etching, the film is coated with an epoxy resin, for example.

Abstract: A drumhead for use in a percussion instrument is composed of multiple (e.g., two or three) plies of synthetic resin films, which are laminated together and are brought into close contact with each other when stretched across the opening of a hollow cylinder of a drum, for example. At least one air evacuation hole is formed at the center of the backside synthetic resin film or in proximity to the center of the backside synthetic resin film. Therefore, when the drumhead is stretched outwardly along a diameter direction of the opening of the hollow cylinder of the drum, remaining air between the films can be reliably evacuated from the air evacuation hole towards the exterior of the drumhead. Thus, it is possible to reduce unwanted loss in transmission of vibration between the films of the drumhead when beaten; hence, it is possible to realize good sound quality in the drum.

Abstract: A drum producing a wooden tom-tom sound free of any disharmony including reinforcement rings made of wood, plastic, etc. and fastened to both ends of the shell and batter heads stretched over these reinforcement rings with no parts for holding the batter heads projecting beyond the batter heads level, thus making a conventional rim shot impossible but a stick-playing method or edge shot in which the batter head and the reinforcement ring are simultaneously struck with a stick possible.

Abstract: In construction of a drum having a cylindrical stem and fore side and rear side drum heads attached to both open ends of the stem, a snappy is arranged within said stem facing the inner surface of the fore side drum head with an adjustable clearance and at adjustable tension for easy generation of musical tones of rich rising characteristics and rich tone volume over the entire tone range.