OPTICAL SCANNER HAVING HIGH-FREQUENCY TORSIONAL OSCILLATOR
First Claim
2. Apparatus according to claim 1 wherein said driving means comprises electromagnetic driving means.
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Abstract
A high-frequency torsional oscillator for use in an optical scanner assembly, including a torsion rod whose ends are connected to a frame through a pair of flexural members which have lower torsional spring constants than the torsion rod. A mirror is attached to the torsion rod near its center, and a pair of rotors are attached to the torsion rod near its ends. Electromagnetic drivers are positioned near the rotors for imparting oscillatory motion thereto when the drivers are energized with a sinusoidally varying current. A phase-lock loop feedback system is used to drive the torsion rod assembly at a resonant frequency so that the mirror and the rotors oscillate with opposite phase, causing a pair of nodes to appear on the torsion rod between the mirror and the rotors.
75 Citations
3 Claims
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2. Apparatus according to claim 1 wherein said driving means comprises electromagnetic driving means.
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3. A high frequency optical scanner comprising:
- a frame;
a torsion rod;
a pair of flexural members resiliently connecting the ends of said torsion rod to said frame, said flexural members having torsional spring constants of lower magnitude than the spring constant of said torsion rod;
a mirror attached to said torsion rod at the center thereof;
a pair of rotors attached to said torsion rod near the ends thereof, said rotors having greater moments of inertia with respect to the axis of said torsion rod than said mirror; and
, driving means mounted to said frame adjacent said rotors for imparting oscillatory motion thereto.
- a frame;
Specification
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- Resources
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Current AssigneeWilliam R. Corker
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Original AssigneeWilliam R. Corker
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InventorsCorker, William R.
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Primary Examiner(s)Schonberg, David
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Assistant Examiner(s)Leonard, John W.
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Application NumberUS05/093,080Time in Patent Office445 DaysField of Search350/6,7,285 178/7,6 250/234,235 310/36US Class Current359/214.1CPC Class CodesG01R 13/38 using the steady or oscilla...G02B 7/1821 for rotating or oscillating...
