| 摘要 |
A flexible disk apparatus comprises a carriage for moving a magnetic head to a specified position of data tracks in a storage medium, a motor for driving the carriage depending on excitation pulses from a step motor, a light shielding plate mounted on the carriage, a light-emitting element (11a), a light-sensitive element (11b) opposing to the light-emitting element through the light shielding plate, and a position-judging means (13) for judging the position of the magnetic head depending on the excitation pulses of the step motor and a signal of the light-sensitive element generated when light is shielded by the light-shielding-plate. To reduce power consumption in a stand-by mode, the power source is disconnected (15) from the element (11). Although no light falls on the light-sensitive element (11b), an erronous zero-condition is not detected because the element (11b) is also disconnected from the power source. |
