| 摘要 |
PURPOSE:To disperse the quantity of heat to whole part of a rotary drum and radiate generated heat of a recording amplifier etc. nicely by bringing a substrate on which a recording amplifier etc. is provided into close contact with the flat part inside of the rotary drum through a heat conductive insulating sheet. CONSTITUTION:An input output substrate 5 is positioned and fixed on the upper face of a flange part 3 with a screw 50, and a recording substrate 7 is brought into close contact with the upper face of the flat part inside of a drum part 4 through a heat conductive insulating sheet 6 made of, for instance, silicone rubber, and positioned and fixed with a screw 70. Further, a reproduction substrate 8 is positioned and fixed on the lower face of the flat part with a screw 80, and a connection substrate 9 is positioned and fixed on the upper face of the flat part with a screw 90 through a spacer 10. Thus, as the recording substrate 7 on which a recording amplifier 73 is provided is closely contacted with the drum part 4 through the heat conductive insulating sheet 6, generated heat of the recording amplifier 73 etc. is dispersed to the drum part 4, and generation of an extreme high temperature point can be prevented.
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