H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/32.2
H04N 5/76 (2006.01) G02B 7/182 (2006.01) G11B 7/00 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1086859
ABSTRACT A pivoting mirror device for pivoting a pivot- ing mirror about two mutually perpendicular pivotal axes under the influence of electric control signals, for a video disc player which reads information from a video disc with the aid of a light beam using an optical system, the mirror being mounted so as to be piv- otable in all directions and the device comprising an electro-dynamic drive system which includes permanent magnets and control coils for controlling the pivoting movements. The mirror is supported near its centre, a permanent magnetic positioning system cooperating with the permanent magnets, which are connected to the mirror, continually subject the bearing to pressure. In order to obtain high efficiency, the permanent magnets of the drive system are magnetized in such a way that the magnetic field lines, at least at the location of the control coils, extend substantially parallel to the reflecting surface of the mirror, whilst moreover at least parts of the turns of the control coils extend parallel to the reflecting surface and transversely to said field lines.
261438
Lakerveld Herman G.
Van Rosmalen Gerard E.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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