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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0793090 (1985-10-30) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 164 인용 특허 : 2 |
An earphone having a housing, a speaker unit accommodated in the housing and a duct formed in the housing to pass sound emanated from the rear surface of the speaker unit and in which a mesh subjected to water repellent treatment is provided within the duct.
An earphone comprising: a housing having a front facing opening, a speaker unit having front and rear portions mounted in said housing with the front of the speaker positioned in said opening; a back cavity in said housing formed between a rear portion of said speaker unit and said housing, and a du
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