Magnetic head positioning device for a flexible disk
Abstract
Abstract A bead positioning apparatus includes 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, a light-sensitive element opposing to the light-emitting element through the light shielding plate and a position-judging device 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, wherein the light-emitting element and the light-sensitive element are connected to a power source through a common switching element and the position-judging device outputs a signal, when the switching element is turned off, which is the same signal as if the light-sensitive element were device sensing light. The switching element being turned off represents a stand-by mode which is a power saving feature.
Inventors
- 👤 Masaru Sasaki
- 👤 Shin Isozaki
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |