| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional mobile wireless unit in which sound quality is deteriorated because an intrusion-preventing felt is fitted to microphone holes opened on a microphone container chamber and consequently confining sound into a small space in a speech state. SOLUTION: The mobile wireless unit contains a speaker 4 for speech and a microphone unit 8 in a device case 1 having an intrusion-resistant structure. The microphone unit 8 is contained in a microphone container chamber 2b formed in the vicinity of the speaker 4 in the device case 1 and a voice reception port 3 to deliver vibration of the speaker 4 to the microphone unit 8 is opened on part of the microphone container chamber 2b. When a user utters a voice toward the device case 1, the voice of the microphone unit 8 in the microphone container chamber 2b is delivered from the microphone hole 2f opened on the upper face of the microphone container chamber 2b, and simultaneously the vibration of the speaker 4 activated by the voice is delivered to the microphone unit 8 through the voice reception port 3 opened on part of the microphone container chamber 2b to activate the microphone unit 8. Thus, deterioration in the sound quality caused by confined sound can be prevented, thereby attaining a speech in a clear voice.
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