| 摘要 |
The zoom lens assembly e.g. is formed by three lenses E, F and G is fixedly mounted on support whereas lens F is mounted on carriage which is axiallly movable along the support by an electric motor. Lens E is mounted on carriage which is axially movable along the support by another electric motor. The motors receive respective position signals from a microprocess. The microprocessor is preprogrammed, according to the predetermined optical parameters of the assembly, with data correlating the position of lenses E and F with focal distance, manification factor and temperature. The required focal distance is manually input to the microprocessor via a controller and the required magnification factor is manually input via another controller. The prevailing temperature of the assembly is continously monitored by a sensor (34) and directly input to the microprocessor along line.
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