Optical: systems and elements – Image stabilization – By movable reflective structure
Patent
1991-07-16
1992-09-15
Arnold, Bruce Y.
Optical: systems and elements
Image stabilization
By movable reflective structure
359196, G02B 2764
Patent
active
051483130
ABSTRACT:
An improved stabilizer cell for an optical instrument is disclosed. A mirror assembly is mounted to and pivoted for torsional movement only about orthogonally disposed wires under high tension. The mirror assembly includes a mirror, a counter weight, and a support point at the neutral inertial axis there between. The counter weight is conductive and non magnetic and given a spherical shape relative to the mirror assembly support point. This counter weight moves within a mechanically adjustable magnetic field for adjustable damping of stabilizer motion. Suspension of the mirror assembly relative to the support point occurs by a first wire having a high modulus of elasticity (preferably tungsten) and placed under high tension. This wire is mounted at right angles to the optical axis of the stabilizer within an assembly support tube and supported in high tension from both distal ends of the assembly support tube. The assembly support tube itself is mounted for torsional movement only about a second wire under high tension, this wire passing orthogonally to both the axis of the stabilizer and the axis of the first wire. The high tension wires are each passed through narrow passageways within the stabillizer so that movement of the mirror assembly about the support point relative to the wire is practicable under the forces of wire torsion only. Each wire has a fixed end and an adjustable end so that torsional adjustment of the mirror assembly to the neutral axis of the stabilizer can occur at any time. In operation, space referenced stabilizing motion of the mirror occurs with adjustable damping resulting in an improved stabilized view through optical instruments employing the improved cell.
REFERENCES:
patent: 3677618 (1972-07-01), Schwemin
patent: 3892467 (1975-07-01), Shin
patent: 3964817 (1976-06-01), Humphrey
patent: 4911541 (1990-03-01), Alvarez et al.
Arnold Bruce Y.
Phan James
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