Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1989-12-18
1991-05-28
Severin, David J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360104, G11B 554
Patent
active
050199323
ABSTRACT:
The hard disk drive permits a decrease in the number of component parts and a reduction in the power consumption by having the lock mechanism provided with a lock member having an engaging part for locking the carriage at the position prescribed for locking the carriage by being brought into engagement with a counter-engaging part disposed on the carriage, a first spring for urging the lock member in the direction in which the engaging part is brought into engagement with the counter-engaging part disposed on the carriage, a second spring partially made of a shape memory alloy the shape of which changes from a first shape to a second shape on exposure to heat generated by flow of electric current therein, the second spring for urging the lock member in the direction in which the lock member releases engagement with the counter-engage member disposed on the carriage according to a change of the shape memory alloy's shape from the first shape to the second shape when electric current flows in the shape memory alloy, and a control circuit for controlling the supply of electric power to the second spring.
REFERENCES:
patent: 4605979 (1986-08-01), Inoue et al.
IBM TDB, "Carriage Lock", vol. 28, No. 7, Dec. 1985, pp. 2889-2890.
IBM TDB, "Disk Head Load/Unload Mechanism", vol. 30, No. 7, Dec. 1987, pp. 386-387.
Kabushiki Kaisha Toshiba
Severin David J.
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