| 摘要 |
A light-sensitive voltage divider includes a light-sensitive device. Preferably, two series connected light-sensitive devices and two resistors a re used to provide a light-sensitive voltage divider that not only is lumen balanced, but that also provides a null voltage in the absence of light. A single-axis input device includes one of the light-sensitive voltage dividers, a lamp as a source of light, and means for selectively controlling transmission of lig ht from the lamp to the light-sensitive voltage divider in response to a mechanical input. The means for controlling transmission of light includes light-contro l caps, a mirrored surface, and a light-restricting fluid. Joystick X-Y input devices and tilt-actuated X-Y input devices each include two of the light-sensitive voltage dividers. Selective control of proportionality, selective control of the rate of start-up, and selective control of the rate of shut-down are achieve d by selectively controlling the rate of change of lumens of light produced from the lamps. Selective control of the lumens of light is achieved by a light- intensity control which is, optionally, a part of each one of the X-Y input devices.</ SDOAB>
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