NOISE REDUCTION DEVICE AND ELECTRONIC APPARATUS

• Main Author: YANAGISAWA YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2021
• Subjects: ACOUSTICS; ACOUSTICS NOT OTHERWISE PROVIDED FOR; AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; MUSICAL INSTRUMENTS; PHYSICS; RANGES; SOUND-PRODUCING DEVICES; VENTILATING; WEAPONS

To provide a noise reduction device capable of enhancing a noise reduction effect and an electronic apparatus.SOLUTION: A noise reduction device includes: a duct having a flow channel for causing air to flow inside; a first detection device provided in the duct to detect a first sound wave propagating in the flow channel; and an output device for interfering with the first sound wave detected by the first detection device to output a second sound wave to reduce the first sound wave. The duct includes: a first opening part and a second opening part; a first recessed part provided at a position deviated from the flow channel with the first detection device arranged inside; and a first slit for causing the inside of the first recessed part to communicate with the flow channel. One opening part of the first opening part and the second opening part is an introduction port for introducing air into the duct, and the other opening part is an exhaust port for exhausting the air introduced into the duct. An output device is located in a first direction from the first opening part to the second opening part along the duct with respect to the first detection device.SELECTED DRAWING: Figure 5 【課題】騒音低減効果を高めることができる騒音低減装置及び電子機器を提供する。【解決手段】騒音低減装置は、空気が流通する流路を内部に有するダクトと、ダクトに設けられ、流路を伝播する第１音波を検出する第１検出装置と、第１検出装置により検出された第１音波に干渉して第１音波を低減させるための第２音波を出力する出力装置と、を備え、ダクトは、第１開口部及び第２開口部と、流路から外れた位置に設けられ、第１検出装置が内部に配置された第１凹部と、第１凹部の内部と流路とを連通させる第１スリットと、を有し、第１開口部及び第２開口部のうち、一方の開口部は、ダクト内に空気を導入する導入口であり、他方の開口部は、ダクト内に導入された空気を排出する排出口であり、出力装置は、第１検出装置に対して、ダクトに沿って第１開口部から第２開口部に向かう第１方向に位置する。【選択図】図５