Turntable for mounting recording medium in disk form

Details Turntable for mounting recording medium in disk form Turntable for mounting recording medium in disk form

1987-09-15

1989-06-20

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369271, G11B 360

Patent

active

048415162

ABSTRACT:
A turntable comprising a disk-shaped substrate and a portion for receiving a disk-shaped recording medium is disclosed. The disk-shaped substrate is shaped from a thermoplastic composite resin having a dynamic shear modulus, G', of at least 1.5.times.10.sup.10 dyne/cm.sup.2, a G.sub.1 '(-40.degree. C.)/G.sub.2 '(100.degree. C.) ratio of up to 1.5, and a density of up to 2.0 g/cm.sup.3, and the receiving portion is formed on the top of the substrate from a thermoplastic elastomer having a hardness of 5 to 40. The turntable has high dimensional precision and will experience reduced warpage. The turntable is capable of being revolved in a stable manner to ensure an increased precision in reading information. In addition, the turntable has a rapid access time and is capable of attaining a steady speed of revolution in a shorter period of time after the power has been switched on.

REFERENCES:
patent: 778492 (1904-12-01), Johnson
patent: 1480629 (1924-01-01), Nolen
patent: 4524109 (1985-06-01), Desai
patent: 4535438 (1985-08-01), Massarell et al.

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