| 摘要 |
PURPOSE:To eliminate scattering of amount of off-track due to variation of ambient temperature and humidity by constituting the first and second carriages using the same material with the frame and mounting a head on an end. CONSTITUTION:A frame 13 is formed of aluminium die casting having coefficient of thermal expansion approximates to that of a disk 2. An upper carriage is made of aluminium material similar to the frame 13, and a suspension 8 is coupled with a coupler 7 on an end, and an upper head 3 is mounted combining the base of the upper head 4 made of plastic etc. in a body at a position that conforms to required position of the upper head 3 on another end. Base material of a lower carriage 12 is aluminium same with the frame 13 similarly to the upper carriage 5, and combined with a base 10 of lower head in a body, and a lower head 11 is mounted on it.
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