| 摘要 |
<p>PURPOSE:To obtain a remote-controlled spotlight capable of lessening the resolution of speed detection and suppressing unevenness in speed so as to calmly and smoothly control the spotlight by providing the spotlight with a speed sensor and a data converter which converts the output of the speed sensor into its corresponding digital value. CONSTITUTION:A monophasic pulse generating type rotary encoder 15 joined to the rotation axis of a servomotor 10 outputs a pulse of frequency in proportion to the rotating speed of the servomotor 10 to a pulse counter 14d which successively outputs pulse numbers counted in every specified time to a microcomputer 14b. The microcomputer 14b obtains the feedback input on the current position, current speed and moving direction of a spotlight lighting-body 12 via an A/D converter 14a for taking them into consideration and subsequently outputs a pulse width modulation signal for rotating the servomotor 10 in a direction which light can be focused in a target position to a drive circuit unit 14c.</p> |
