Torsion bar scanner with damping

Details Torsion bar scanner with damping Torsion bar scanner with damping

1988-09-09

1990-04-24

Arnold, Bruce Y.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

350 691, 350487, 318127, 310321, G02B 2610

Patent

active

049195000

ABSTRACT:
A resonant scanner has at least one torsionally rigid damper located at at least one torsional node point of a torsion bar. At least one node of an unwanted vibrational mode is determined to be at a distinct node point, whereby the damper damps the unwanted vibrations while passing desired torsional oscillations. The damper serves as the only physical coupling of the torsion bar to the housing and damps transmission of vibrations into and out of the scanner. One or both ends of the torsion bar may be configured as the rotor of a motor. The rotor fits within but is not physically coupled to a bobbin coupled to the frame. Two coils are wound on the bobbin at approximate right angles to each other to minimize a cross-coupling between the coils.

REFERENCES:
patent: 3532408 (1970-10-01), Dostal
patent: 3642344 (1972-02-01), Corker
patent: 3666974 (1972-05-01), Dostal
patent: 3799644 (1974-03-01), Street
patent: 3921045 (1975-11-01), Reich et al.
patent: 3959673 (1976-05-01), Montagu
patent: 4037121 (1977-07-01), Nakamura et al.
patent: 4220885 (1980-09-01), Yamashita et al.
patent: 4317611 (1982-03-01), Petersen
patent: 4321500 (1982-03-01), Paros et al.
patent: 4502752 (1985-03-01), Montagu

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