| 摘要 |
<p>PHN.9707 10 To reduce the susceptibility of an electrodynamically controllable pivoting mirror device to stray magnetic fields, said device comprises a pivoting mirror which is mounted on a frame so as to be pivotable by means of a suitable earing arrangement, on which mirror permanent-magnetic means are arranged on which a pivoting torque can be exerted by means of control coils mounted on the frame. By providing the permanentmagnetic means, on the side where they are located, with two zones of north polarity (N) and two zones of south polarity (S), which are situated on diametrically opposed sides relative to the pivoting axis, and by moreover having the turns of the control coil extend over zones of north and of south polarity, a pivoting mirror device is obtained whose control coils dissipate a minimum amount of heat and which is less susceptible to external magnetic stray fields produced by components located in the vicinity, such as transformers and electric motors.</p> |
