Soundproof structure

Patent metadata

Field	Value
Publication number	US-10854183-B2
Application number	US-201715822638-A
Country	US
Kind code	B2
Filing date	Nov 27, 2017
Priority date	Jun 22, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

There is provided a soundproof structure which is light and thin, which has air permeability so that wind and heat can pass therethrough and accordingly no heat accumulates on the inside, and which is suitable for equipment, automobiles, and household applications. The soundproof structure has one or more soundproof cells. Each soundproof cell includes a frame having a through-hole through which sound passes, a film fixed to the frame, an opening portion configured to include one or more holes drilled in the film, and a weight disposed on the film. The soundproof structure has a first shielding peak frequency, which is determined by the opening portion drilled in the film and at which a transmission loss is maximized, on a lower frequency side than a first natural vibration frequency of the film of each soundproof cell and a second shielding peak frequency, which is determined by the weight and at which a transmission loss is maximized, on a higher frequency side than the first natural vibration frequency of the film, and selectively insulates sound in a predetermined frequency band centered on the first shielding peak frequency and sound in a predetermined frequency band centered on the second shielding peak frequency.

First claim

What is claimed is:

1. A soundproof structure, comprising:
one or more soundproof cells,
wherein each of the one or more soundproof cells comprises a frame having a through-hole through which sound passes, a film fixed to the frame, an opening portion configured to include one or more holes drilled in the film, and a weight disposed on the film,
one end portion of the frame opposite to other end portion to which the film is fixed is open, and
the soundproof structure has a first shielding peak frequency, which is determined by the opening portion drilled in the film of each of the one or more soundproof cells and at which a transmission loss is maximized, on a lower frequency side than a first natural vibration frequency of the film of each of the one or more soundproof cells and a second shielding peak frequency, which is determined by the weight and at which a transmission loss is maximized, on a higher frequency side than the first natural vibration frequency of the film, and selectively insulates sound in a predetermined frequency band centered on the first shielding peak frequency and sound in a predetermined frequency band centered on the second shielding peak frequency.

2. The soundproof structure according to claim 1 ,
wherein the one or more soundproof cells are a plurality of soundproof cells arranged in a two-dimensional manner.

3. The soundproof structure according to claim 1 ,
wherein the first natural vibration frequency is determined by a geometric form of the frame of each of the one or more soundproof cells and stiffness of the film of each of the one or more soundproof cells,
the first shielding peak frequency is determined according to an area of the opening portion drilled in the film of each of the one or more soundproof cells, and
the second shielding peak frequency is determined according to a mass of the weight disposed on the film of each of the one or more soundproof cells.

4. The soundproof structure according to claim 2 ,
wherein the first natural vibration frequency is determined by a geometric form of the frame of each of the one or more soundproof cells and stiffness of the film of each of the one or more soundproof cells,
the first shielding peak frequency is determined according to an area of the opening portion drilled in the film of each of the one or more soundproof cells, and
the second shielding peak frequency is determined according to a mass of the weight disposed on the film of each of the one or more soundproof cells.

5. The soundproof structure according to claim 1 ,
wherein the first natural vibration frequency is determined by a shape and a size of the frame of each of the one or more soundproof cells and thickness and flexibility of the film of each of the one or more soundproof cells, and
the first shielding peak frequency is determined according to an average area ratio of the opening portions drilled in the films of the one or more soundproof cells.

6. The soundproof structure according to claim 4 ,
wherein the first natural vibration frequency is determined by a shape and a size of the frame of each of the one or more soundproof cells and thickness and flexibility of the film of each of the one or more soundproof cells, and
the first shielding peak frequency is determined according to an average area ratio of the opening portions drilled in the films of the one or more soundproof cells.

7. The soundproof structure according to claim 1 ,
wherein the first natural vibration frequency is included in a range of 10 Hz to 100000 Hz.

8. The soundproof structure according to claim 6 ,
wherein the first natural vibration frequency is included in a range of 10 Hz to 100000 Hz.

9. The soundproof structure according to claim 1 ,
wherein the opening portion drilled in the film of each of the one or more soundproof cells is formed by one hole.

10. The soundproof structure according to claim 8 ,
wherein the opening portion drilled in the film of each of the one or more soundproof cells is formed by one hole.

11. The soundproof structure according to claim 1 ,
wherein the opening portion drilled in the film of each of the one or more soundproof cells is formed by a plurality of holes having the same size.

12. The soundproof structure according to claim 10 ,
wherein the opening portion drilled in the film of each of the one or more soundproof cells is formed by a plurality of holes having the same size.

13. The soundproof structure according to claim 1 ,
wherein the opening portion is formed so as to pass through the weight.

14. The soundproof structure according to claim 12 ,
wherein the opening portion is formed so as to pass through the weight.

15. The soundproof structure according to claim 1 ,
wherein the weight has a cylindrical shape.

16. The soundproof structure according to claim 14 ,
wherein the weight has a cylindrical shape.

Assignees

• Fujifilm Corp

Inventors

• Yamazoe Shogo
• Hakuta Shinya
• Kasamatsu Tadashi
• Naya Masayuki

Classifications

• G10K11/16 Primary

  Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) · CPC title