| 摘要 |
PROBLEM TO BE SOLVED: To cool the inside of a casing body with outside air without preparing a cooling fan or the like. SOLUTION: An exhaust opening part 104 is formed in the disk chamber 114 side of the outside wall 110A of the casing body 110 and an intake opening part 106 is formed in the substrate chamber 116 side of the other outside wall 110B of the casing body 110. Also, an opening part 112A for arranging an OP 142 is formed in the inner partition 112 between substrate chamber 116 and the disk chamber 114. Air absorbed from the intake opening part 106 owing to the flow of sir generated by a high speed rotation of an optical disk 102 passes through a hole 112A from the substrate chamber 116 side, further passes through the disk chamber 114 and is discharged from the exhaust opening part 104. That is internal cooling is excuted without preparing the cooling fan or the like by forming passage for the outside air in the inside of the casing body 110 and circulating cooling air by the high speed rotation of the optical disk 102.
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