Disk playback apparatus and stepping-motor control apparatus

Details Disk playback apparatus and stepping-motor control apparatus Disk playback apparatus and stepping-motor control apparatus

2008-04-09

2010-12-14

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S670000, C318S560000, C369S047100, C369S047360

Reexamination Certificate

active

07852036

ABSTRACT:
When the magnitude of a traverse signal exceeds a predetermined level, the value of a microstep drive signal is changed by one microstep angle so that the rotation angle of the stepping motor changes in a rotation direction in which the magnitude of the traverse signal decreases. A determination is made as to whether or not the magnitude of the traverse signal becomes a predetermined level or less. When the magnitude of the traverse signal does not become the predetermined level or less, the magnitude of the microstep drive signal is returned to the pre-change value and the value of the microstep drive signal is incremented by an additional microstep angle so that the rotation angle of the stepping motor changes in a rotation direction in which the magnitude of the traverse signal decreases.

REFERENCES:
patent: 6445649 (2002-09-01), Saito et al.
patent: 6804176 (2004-10-01), Komazaki
patent: 7085200 (2006-08-01), Okada et al.
patent: 7106668 (2006-09-01), Okada et al.
patent: 2001-76448 (2001-03-01), None
patent: 2004-139656 (2004-05-01), None

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