Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1987-10-06
1989-08-08
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 2108
Patent
active
048558532
ABSTRACT:
An actuator mechanism for positioning magnetic heads includes arms that support a magnetic recording/reproducing head at one end thereof. Each of the arms is mounted about a shaft and supported for rotation. A coil support member is attached to the end of the arms opposite the head, and is made of a molded resin that integrally covers a voice coil motor used for causing the swinging movement of the arms. The molded resin of the coil support member is a synthetic resin mixed with a powered metal having a known specific gravity and thermal expansion coefficient. Thus, the weight of the synthetic resin can be adjusted to balance a portion including the magnetic heads and the arms with the coil support member in relation to the shaft. Additionally, the thermal expansion coefficient of the coil support member is selected to be substantially equal to that of the arms and the coil so that these components expand and contract to the same degree with variations in temperature to prevent deformation or cracks from occurring in the coil support member.
REFERENCES:
patent: 3988657 (1976-10-01), Prival et al.
patent: 4196456 (1980-04-01), Manzke et al.
patent: 4391035 (1983-07-01), Van de Butt
patent: 4602305 (1986-07-01), Ghose
patent: 4665453 (1987-05-01), Mikamoto et al.
patent: 4695910 (1987-09-01), Maruyama et al.
Amano Hideaki
Matsushita Toshio
Nakada Yasusuke
Nakamura Shigeo
Yamaura Satoru
Bussan Matthew J.
Hitachi , Ltd.
Wolff John H.
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