| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-weight and low-cost moistureproof optical device that allows for simple maintenance. SOLUTION: The optical device whose main body has a hermetically sealed structure includes an absorbent member disposed inside the main body. In the optical device, the absorbent member has a moisture absorptive capacity corresponding to at least an amount of water retention inside the main body. COPYRIGHT: (C)2006,JPO&NCIPI
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