Magnetic motion damping system for pendulous compensator

Details Magnetic motion damping system for pendulous compensator Magnetic motion damping system for pendulous compensator

1989-07-14

1991-06-25

Turner, Samuel

Optics: measuring and testing

Fiducial instruments

Artificial reference

356149, 33283, G01C 912

Patent

active

050261576

ABSTRACT:
Motion damping apparatus is provided for use in a light beam projector including a light beam and a pendulous compensator adapted to movably support a mirror for deflecting the light beam to compensate for tilting of the projector. The apparatus comprises at least one motion damping plate formed of an electrically conducting material and coupled to the pendulous compensator. Magnets are positioned adjacent the damping plate for generating a magnetic field through which the plate passes as the result of motion of the pendulous compensator such that the motion is damped by the interaction of magnetic fields produced by the magnets and by eddy currents generated in the plate by its movement within a magnetic field. The motion damping plate preferably is curvilinear and coupled to the pendulous compensator to move in substantial conformity with a corresponding curvilinear plane defined by the movement of the pendulous compensator. In this way, the plate can be closely spaced to the magnets for efficient damping operation with the spacing being substantially maintained without contact between the plate and the magnets throughout the operating range of the pendulous compensator.

REFERENCES:
patent: 3771876 (1973-11-01), Ljungdahl et al.
patent: 4065974 (1978-01-01), Ever et al.
patent: 4679937 (1987-07-01), Cain et al.
patent: 4801791 (1989-01-01), Cain
patent: 4854704 (1989-08-01), Funazaki et al.

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