Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
An autolock design is described which avoids common failures by employing a magnet instead of the conventional mechanical and electrical apparatus. In Fig. 1a, a mounting bracket 1 with a permanent magnet and two poles 2 is fixed to the frame of the file. Another iron pole called the bobbin pole 3 is mounted inside of the moving coil of the voice coil motor on the actuator. These poles are positioned in such a way that when the actuator is in the lock position or landing zone 4 (see Fig. 1b), the pole tips are in alignment. The magnetic attraction will tend to hold the actuator in this position. When the file is powered on, the actuator is moved away from the lock position by a current applied to the voice coil. The current causes a magnetic flux in the bobbin pole.