Home apparatus
AssigneeMinnesota Mining and Manufacturing Company
InventorArthur Ostroff
Life of this patent
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AssigneeMinnesota Mining and Manufacturing Company
InventorArthur Ostroff
Estimating the term…
An initialization apparatus for a signal reproducing apparatus having a transducer scanning a plurality of record tracks on a record medium where the position of the transducer is controlled by a stepper motor having fewer steps than the number of record tracks required to be covered. A physical stop is provided the transducer near a selected "home" record track at one edge of the plurality of record tracks. A current selector supplies the phase windings of the stepper motor with a reduced amplitude current during an initialization position. This enables a transducer controller to stop the stepper through a sequence of steps under reduced current to the phase windings of the stepper until the physical stop is contacted, thus ensuring knowledge of the initialization of the transducer at the "home" record track.
A signal reproducing apparatus, comprising:
In a signal reproducing apparatus of the type wherein at least one transducer scans a selected one of a plurality of parallel tracks on a record medium on which signals may be recorded, wherein a stepper motor is used to control the position of said transducer, with respect to said plurality of parallel tracks, wherein said stepper motor has a plurality of windings with each step of said stepper motor being defined by a particular current present in each of said plurality of windings, wherein the number of said plurality of parallel tracks exceeded the number of said particular steps of said stepper motor, wherein control means controls the movement of said transducer relative to said plurality of parallel tracks by moving said transducer a selected number of tracks by providing a sequence of currents to said plurality of windings to effect a movement in said stepper motor, wherein a physical stop is positioned near one of said plurality of parallel tracks, designated a home track, said physical stop for restricting the movement of said transducer from moving beyond said home track, and wherein current selection means selects either a set of high amplitude currents or a set of low amplitude currents to be supplied to said plurality of windings, a method for initializing the position of said transducer at said home track, comprising:
Dependencies are inferred from the claim text.