Tonometer air pulse generator
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United States of America Patent
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Jul 14, 1998
Grant Date -
N/A
app pub date -
Jun 10, 1996
filing date -
Jun 10, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air pulse generator for a non-contact tonometer comprises a bi-directional linear motor drivably connected to a compression mechanism and responsive to an applanation signal for reducing unnecessary air pulse energy delivered to an eye. Upon receiving the applanation signal from an applanation detector, a motor controller reverses current flow in the coil of the motor to create a reverse electromagnetic force to stop generation of the air pulse. In a first embodiment, the linear motor includes a moving permanent magnet armature for reversibly driving the compression mechanism, while in a second embodiment, the linear motor includes a moving coil for reversibly driving the compression mechanism.
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