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US 5,402,048 AGranted
Nodding scanner
AssigneeVernitron Corporation
InventorShankar S. Rao
Life of this patent
Estimating the term…
Abstract
A limited rotation assembly for an optical scanner. This assembly includes an input command unit and a signal generator and an electronic driver and a summing junction and a torquer connected in series. The torquer has a tachometer with a start-stop pulse feedback loop to the signal generator and with an angular velocity and position pulse feedback loop to the summing junction.
Claims5
A nodding scanner, comprising:
- an input command unit;
- a signal generator connected to said input command unit and having an output providing angular position signals;
- an electronic driver connected to said signal generator;
- a summing junction connected to said electronic driver;
- an oscillation torquer unit connected to said summing junction and having a drive stator and a drive rotor;
- a shaft having an axis of rotation and coaxially supporting said drive rotor;
- an oscillation tachometer unit having a tachometer coil assembly and a tachometer magnet coaxially supported on said shaft;
- said tachometer coil assembly having a first output feedback signal connected to said summing junction for providing angular velocity signals, and a second feedback signal connected to said signal generator for providing shaft angular position start and stop pulses to said signal generator;
- and
- a scanner means coaxially supported on said shaft.
7 more elements
Dependencies are inferred from the claim text.