Optical pickup moving mechanism

Details Optical pickup moving mechanism Optical pickup moving mechanism

1997-02-06

1998-05-19

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

318626, 318466, 369 33, 369 52, G11B 2102

Patent

active

057540225

ABSTRACT:
An optical pickup is provided with a limiting wall spaced a predetermined distance apart from a screw shaft to limit the separation of an interlocking projection away from the screw shaft, so that the interlocking projection cannot be disengaged from the helical groove of the screw shaft and, consequently, the screw shaft becomes unable to rotate. This state in which the screw shaft is unable to be rotated, i.e., a state where the optical pickup has bee moved to its inner limit position, can be detected through the detection of a change in the coil current of a stepping motor by a coil current measuring means or through the detection of the increase of voltage induced by the rotation of the magnet of the stepping motor to a predetermined level on the basis of the measured coil current measured by the current measuring means.

REFERENCES:
patent: 5012168 (1991-04-01), Dara et al.
patent: 5040159 (1991-08-01), Oliver et al.
patent: 5134600 (1992-07-01), Oliver et al.

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