| 摘要 |
In a recording disc assembly comprising a recording disc, a hub made of plastic resin material, having a pair of reference surfaces formed on the inner surface of a rotational shaft insertion hole for positioning the disc assembly in a recording device by engagement of a rotational shaft of the recording device and a supporting plate made of metal integrally formed with the hub, the supporting plate is provided with at least a stepped portion near the reference surfaces so as to assure good accuracy of the flat plane of the reference surfaces when the hub is molded.
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