US 11,756,521 B2
Soundproof structure and soundproof unit
Shinya Hakuta, Ashigara-kami-gun (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Feb. 16, 2021, as Appl. No. 17/176,272.
Application 17/176,272 is a continuation of application No. PCT/JP2019/027646, filed on Jul. 12, 2019.
Claims priority of application No. 2018-153519 (JP), filed on Aug. 17, 2018.
Prior Publication US 2021/0166671 A1, Jun. 3, 2021
Int. Cl. G10K 11/172 (2006.01)
CPC G10K 11/172 (2013.01) 19 Claims
OG exemplary drawing
 
1. A soundproof structure that includes a housing forming a space therein and having a through hole that allows the space to communicate with an outside, and generates Helmholtz resonance by the space and the through hole, the soundproof structure comprising:
a rear surface plate disposed at a position overlapping the through hole on the space side as viewed from a penetrating direction of the through hole, wherein
a diameter of the through hole is Φ and a distance from the rear surface plate to an opening surface of the through hole on the space side is d, d≤Φ is satisfied and d≤ 6 mm is satisfied,
a coefficient of an opening end correction in the through hole is 1.8 or more, and
the rear surface plate is disposed in the space.