Reflector oscillating apparatus

Details Reflector oscillating apparatus Reflector oscillating apparatus

1990-10-05

1992-03-24

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359223, G02B 2608

Patent

active

050993526

ABSTRACT:
Provided is a reflector oscillating apparatus in which the positions of a reflector and a compensating plate are detected so as to perform positioning with a high degree of positional accuracy (closed-loop control). Further, since the reflector and the compensating plate are driven by a couple of forces, no reaction forces by drive forces are applied to a rotary shaft and a support section, and accordingly, it is possible to enhance the positioning accuracy and to realize a short transient time and a large amplitude. Further, the magnetic circuit is commonly used so that the dimensions of a motor, that is, the height thereof in particular, can be reduced, irrespective of a large drive force. Accordingly, the reflector oscillating apparatus can be greatly miniaturized. Further, by commonly using the magnetic circuit, the impedance of the coil can be reduced, thereby it is possible to drive the apparatus at a high speed with a low drive voltage.

REFERENCES:
patent: 4613203 (1986-09-01), Proetel et al.
patent: 4861149 (1989-08-01), Ealey
patent: 4943771 (1990-07-01), Fuschetto
patent: 4958894 (1990-09-01), Khowles
patent: 4959568 (1990-09-01), Stokes
K. R. Lorell et al., "A Microprocessor-based Position Control System for a Telescope Secondary Mirror", Automatica vol. 20, No. 3, pp. 295-308, 1984.

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