Earphone having sound insulation means

Abstract

The present invention relates to an inexpensive environmental noise reduction type inner earphone which allows a user to listen music with high quality of sound and with a small volume under noisy environments making noise of 86dB or more such as in aircraft seats, subways, trains and so on, and particularly which is capable of blocking a high level of environmental noise and regeneration sound passing through the inner earphone by filling a space formed between an ear and the inner earphone with a sound insulation element made of porous soft plastic. The earphone includes a frequency characteristic correction circuit which serves to correct a sound insulation characteristic of the sound insulation element between a voice coil of the earphone and a plug of the earphone and includes a resistor and a capacitor.

Description

[0001] In the specification and claims of the present invention, expressions within {} take precedence over expressions outside {}, and the words defined in the claims are also applicable to the description. technical field [0002] The invention relates to a sound-insulating material, a sound-absorbing material, a reduction of environmental noise, a manufacturing technology of an earphone and a circuit filter. Background technique [0003] At present, there are earphones or players with the function of reducing environmental noise (noise) on the market, which are roughly divided into active and passive methods. The present invention relates to passive means. [0004] As the background technology of the passive method, in order to shield the sound transmission path from the environmental noise source to the auditory sense, it is important to improve the external noise shielding performance of the earphone itself while maintaining the reproduction performance of the earphone,...

AI Technical Summary

Problems solved by technology

[0006] In the earplug-type electroacoustic conversion device described in Japanese Patent Application Laid-Open No. 2002-200109, it is proposed that the {vibration of the vibration plate of the earphone} is directly transmitted to {the sound-insulating element as the earplug}, thereby exerting the function of reducing noise, but the sound-insulating material Originally, it is not suitable for {materials with completely different transmission characteristics to transmit sound directly by mechanical vibration}, so it is difficult to obtain high-quality acoustic performance

[0007] Existing sound insulation elements are not effective enough in the noise environment {subway station or train interior} where the environmental noise is as high as 87dB, or the noise environment {engine or wind noise} of the aircraft

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