| 摘要 |
PURPOSE: A portable case for a musical instrument with automatic humidity control function is provided to regularly maintain the humidity inside of the case by using hair and PET films. CONSTITUTION: A portable case for a musical instrument with automatic humidity control function comprises hair(2-6) and PETs(Poly-Ethylene Terephthalat). The hair or the PETs are wound in a hair reel(2-5). A moisture control window(2-7) is moved by using a hygroscopic expansion property of the hair or the PETs and the tensile force of springs when moisture is increased or decreased so that a dehumidification window and a humidification window are automatically opened/closed.
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