Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-03-16
1997-03-11
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359199, 359203, 359214, G02B 2608
Patent
active
056107528
ABSTRACT:
Systems embodying the invention include a vibrating arm having one side on which is mounted a reflective surface for sweeping a beam of light across a target whose contents are to be read. The vibrating arm includes a bar of magnetic material pivoted about its center so as to be able to rotate freely (i.e., be "movable"). The ends of the "movable" bar are located between the side walls of a stationary (i.e., non-moving or fixed) yoke of magnetic material with a driving coil located between the ends of the movable bar and the side walls of the stationary yoke. The stationary yoke is of magnetic material for concentrating a magnetic field encompassing the movable bar, the coil and the stationary yoke. The combination of the movable bar and the yoke are configured to produce a magnetic field such that with no current in the driving coil, the movable bar has a defined equilibrium (or rest) position and when the movable bar is displaced from its equilibrium position a magnetic restoring torque is present such that the movable bar oscillates about its equilibrium, position. In a preferred embodiment the bar is a permanent magnet and the yoke is made of magnetic material. A varying current signal is selectively supplied to the driving coil to control the frequency and amplitude of the vibrations of the movable bar.
REFERENCES:
patent: 4389101 (1983-06-01), van Rosmalen
patent: 4958894 (1990-09-01), Khowles
patent: 4974918 (1990-12-01), Delache et al.
patent: 5097355 (1992-03-01), Eden
patent: 5428473 (1995-06-01), Takizawa et al.
Opticon Inc.
Phan James
Schanzer Henry I.
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