Laminated plyboard for musical instrument, method for manufacturing the same, and musical instrument

Patent metadata

Field	Value
Publication number	US-10418006-B2
Application number	US-201715855397-A
Country	US
Kind code	B2
Filing date	Dec 27, 2017
Priority date	Mar 2, 2017
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

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 S 1 including layers 24 and 25 , a second layer portion S 2 including layers 26 and 27 , and an impregnated layer 21 impregnated with phenol and sandwiched between the first layer portion S 1 and the second layer portion S 2 . 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 S 1 and the second layer portion S 2.

First claim

What is claimed is:

1. A laminated plyboard for a musical instrument, the laminated plyboard comprising:
a first layer portion including at least one layer;
a second layer portion including at least one layer; and
an impregnated layer impregnated with phenol and sandwiched between the first layer portion and the second layer portion,
wherein a rigidity coefficient of the impregnated layer is higher than rigidity coefficients of the layers that configure the first layer portion and the second layer portion, and
wherein a bending rigidity of the first layer portion with respect to a central axis passing through a center of the impregnated layer in a thickness direction and perpendicular to the thickness direction, and a bending rigidity of the second layer portion with respect to the central axis are equal.

2. The laminated plyboard for a musical instrument according to claim 1 , wherein the impregnated layer is made of a paper impregnated with phenol.

3. The laminated plyboard for a musical instrument according to claim 1 , wherein specific gravity of the impregnated layer is 1.0 to 2.0, and specific gravity of the first layer portion and the second layer portion is 0.4 to 0.7.

4. The laminated plyboard for a musical instrument according to claim 1 , wherein both the layers that configure the first layer portion and the second layer portion are made of wood.

5. The laminated plyboard for a musical instrument according to claim 4 , wherein the first layer portion has a two-layer structure in which two layers are laminated in a thickness direction of the laminated plyboard for the musical instrument.

6. The laminated plyboard for a musical instrument according to claim 5 , wherein the second layer portion has a two-layer structure in which two layers are laminated in the thickness direction of the laminated plyboard for the musical instrument.

7. The laminated plyboard for a musical instrument according to claim 6 , wherein decorative plyboard is attached to a surface of the first layer portion, the surface being on an opposite side of the impregnated layer.

8. The laminated plyboard for a musical instrument according to claim 5 , wherein the two layers are laminated such that wood grain of the laminated two layers is shifted from each other.

9. The laminated plyboard for a musical instrument according to claim 8 , wherein the wood grain of the laminated two layers is shifted from each other by 45° or more.

10. The laminated plyboard for a musical instrument according to claim 9 , wherein the wood grain of the laminated two layers is shifted from each other by 90.

11. A musical instrument comprising:
the laminated plyboard for a musical instrument according to claim 1 .

12. The musical instrument according to claim 11 , wherein
the musical instrument is a drum, and
the laminated plyboard for a musical instrument is used for a shell of the drum.

13. A laminated plyboard for a musical instrument, the laminated plyboard comprising:
a first layer portion including at least one layer;
a second layer portion including at least one layer; and
an impregnated layer impregnated with phenol and sandwiched between the first layer portion and the second layer portion,
wherein a rigidity coefficient of the impregnated layer is higher than rigidity coefficients of the layers that configure the first layer portion and the second layer portion, and
wherein thickness and arrangement of layers that configure the first layer portion and thickness and arrangement of layers that configure the second layer portion are symmetrical about a center of the impregnated layer in a thickness direction, and material of the layers arranged at symmetrical positions is common.

14. A musical instrument comprising:
the laminated plyboard for a musical instrument according to claim 13 .

15. A laminated plyboard for a musical instrument, the laminated plyboard comprising:
a first layer portion including at least one layer;
a second layer portion including at least one layer; and
an impregnated layer impregnated with phenol and sandwiched between the first layer portion and the second layer portion,
wherein a rigidity coefficient of the impregnated layer is higher than rigidity coefficients of the layers that configure the first layer portion and the second layer portion,
wherein the first layer portion and the second layer portion have an approximately same thickness and are made of a single layer, and
wherein rigidity coefficients of the respective single layers are equal.

16. A musical instrument comprising:
the laminated plyboard for a musical instrument according to claim 15 .

Assignees

• Yamaha Corp

Inventors

• Ohmuro Hiroaki
• Okumura Yukimasa
• Nagashima Hironao

Classifications

• G10D13/22 Primary

  Shells · CPC title

• B32B1/08

  Tubular products · CPC title

• B32B21/042

  of wood (B32B21/13 takes precedence) · CPC title

• G10D13/00

  Percussion musical instruments; Details or accessories therefor (struck string instruments G10D1/14) · CPC title

• G10D13/02 Primary

  Drums; Tambourines with drumheads · CPC title