Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2007-11-27
2007-11-27
Lee, John R. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S559450
Reexamination Certificate
active
11314960
ABSTRACT:
A tracking auto-focus system maintains a microscope pointed at a TFT array continuously in focus so as to eliminate the auto-focusing time that would otherwise be required. The tracking auto-focus system includes, in part, a microscope Z actuator, an auto-focus sensor, an analog-to-digital converter (ADC), a signal conditioner, a digital proportional integrating and differentiating (PID) controller, and a digital-to-analog converter. The actuator adjusts the distance between the microscope's objective lens and the target and includes, in part, an amplifier, a linear motor, and a linear encoder which provides positional feedback. The auto-focus sensor together with the ADC and signal conditioner continuously monitor and detect the distance between the microscope's objective lens and the target and supply the measured distance to the amplifier. The PID controller together with the DAC stabilizes the distance separating the microscope's objective lens and the target to maintain the best focus.
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Lee John R.
Photon Dynamics, Inc.
Townsend and Townsend / and Crew LLP
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