Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-06-03
1995-11-21
Dzierzynski, Paul M.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359196, 359198, 359199, G02B 2608
Patent
active
054692890
ABSTRACT:
The rotational shaft 22 is provided with a pair of permanent magnets 31a and 31b, at its opposite ends. The bearing device 30 for the light scanning apparatus includes: a pair of electromagnets 32a and 32b; and a pair of voltage control circuits 33a and 33b. The electromagnet 32a is constructed from an iron core 321a provided with a coil 322a. Similarly, the electromagnet 32b is constructed from an iron core 321b provided with a coil 322b. When the rotational number increases to exceed a predetermined rotational number, the control signal generating circuit 53 switches the electric voltage applied through each of the coils 322a and 322b so as to switch the bearing stiffness of the bearing device. As a result, the resonant frequencies of the conical and cylindrical modes become much lower than the present actual rotational number .omega.0 of the rotational shaft. Accordingly, it is possible to prevent the rotational shaft from exhibiting any of the conical and cylindrical mode resonant actions.
REFERENCES:
patent: Re33721 (1991-10-01), Sato et al.
patent: 4473259 (1994-09-01), Goldowsky
patent: 5036235 (1991-07-01), Kleckner
patent: 5355042 (1994-10-01), Lewis et al.
"Review of the Gas Centrifuge until 1962. Part 2: Principles of High-Speed Rotation" by S. Whitley, Reviews of Modern Physics, vol. 56, No. 1, Jan. 1984, pp. 67-97.
Iwao Naoto
Yamada Shoji
Brother Kogyo Kabushiki Kaisha
Dzierzynski Paul M.
Kong Steve
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