Soundproof structure, louver, and soundproof wall

1. A soundproof structure, comprising:

at least one soundproof cell comprising a frame having a hole portion and a film fixed to the frame so as to cover the hole portion,

wherein the soundproof cell is disposed in an opening member having an opening in a state in which a film surface of the film is inclined with respect to an opening cross section of the opening member and a region serving as a ventilation hole, through which the gas passes, is provided in the opening member,

wherein no weight is fixed to the film of the soundproof structure.

2. The soundproof structure according to claim 1 ,

wherein the soundproof cell is disposed within an opening end correction distance from an opening end of the opening member.

3. The soundproof structure according to claim 1 ,

wherein the soundproof cell has a size smaller than a wavelength of a first natural vibration frequency of the film.

4. The soundproof structure according to claim 3 ,

wherein the first natural vibration frequency is included within a range of 10 Hz to 100000 Hz.

5. The soundproof structure according to claim 1 ,

wherein the soundproof cell is disposed at a position where sound pressure formed on the opening member by sound waves of a first natural vibration frequency of the soundproof cell is high.

6. The soundproof structure according to claim 1 ,

wherein the soundproof cell is disposed at a position of an antinode of a sound pressure distribution of standing waves formed on the opening member by sound waves of a first natural vibration frequency of the soundproof cell.

7. The soundproof structure according to claim 1 ,

wherein the soundproof structure has a plurality of the soundproof cells.

8. The soundproof structure according to claim 7 ,

wherein the plurality of soundproof cells include two or more types of soundproof cells having different first natural vibration frequencies, and

each of the two or more types of soundproof cells having different first natural vibration frequencies is disposed at a position where sound pressure formed on the opening member by sound waves of the first natural vibration frequency corresponding to each soundproof cell is high.

9. The soundproof structure according to claim 7 ,

wherein the plurality of soundproof cells include two or more types of soundproof cells having different first natural vibration frequencies, and

each of the two or more types of soundproof cells having different first natural vibration frequencies is disposed at a position of an antinode of a sound pressure distribution of standing waves formed on the opening member by sound waves of the first natural vibration frequency corresponding to each soundproof cell.

10. The soundproof structure according to claim 7 ,

wherein the plurality of soundproof cells include two or more soundproof cells having the same first natural vibration frequency, and

the two or more soundproof cells are disposed on the same circumference of an inner peripheral wall of the opening member.

11. The soundproof structure according to claim 10 ,

wherein the plurality of soundproof cells further include one or more types of soundproof cells having the first natural vibration frequency different from the same first natural vibration frequency of the two or more soundproof cells, and

the one or more types of soundproof cells having the different first natural vibration frequency are disposed in series with one of the two or more soundproof cells having the same first natural vibration frequency in a central axis direction of the opening member.

12. The soundproof structure according to claim 7 ,

wherein the plurality of soundproof cells include two or more soundproof cells having the same first natural vibration frequency, and

the two or more soundproof cells are disposed in series in a central axis direction of the opening member.

13. The soundproof structure according to claim 12 ,

wherein the plurality of soundproof cells further include one or more types of soundproof cells having the first natural vibration frequency different from the same first natural vibration frequency of the two or more soundproof cells, and

the one or more types of soundproof cells having the different first natural vibration frequency are disposed in series in the central axis direction of the opening member.

14. The soundproof structure according to claim 1 ,

wherein the hole portion is open, and the film is fixed to both end surfaces of the hole portion.

15. The soundproof structure according to claim 1 ,

wherein the hole portion is open, and the film is fixed to both end surfaces of the hole portion, and

first natural vibration frequencies of the films on both the surfaces are different.

16. The soundproof structure according to claim 1 , further comprising:

a through-hole communicating with rear surface spaces of the films of the soundproof cells adjacent to each other.

17. The soundproof structure according to claim 1 ,

wherein the film has a through-hole.

18. The soundproof structure according to claim 1 , further comprising:

a sound absorbing material disposed in the hole portion of the frame.

19. The soundproof structure according to claim 1 , further comprising:

a mechanism for adjusting an inclination angle of the film surface of the soundproof cell with respect to the opening cross section.

20. The soundproof structure according to claim 1 ,

wherein the soundproof cell is a member that is removable from the opening member.

21. The soundproof structure according to claim 1 ,

wherein the opening member is a cylindrical body, and the soundproof cell is disposed inside the cylindrical body.

22. A louver comprising the soundproof structure according to claim 1 .

23. A soundproof wall comprising the soundproof structure according to claim 1 .