| 摘要 |
PURPOSE:To prevent burning of drive motor caused by the fact that the optical axis setting voltage has went outside of adjustable range, by constructing such that the output terminal of optical axis setting circuit is held at constant level to be determined by devision ratio of resistor deviation circuit. CONSTITUTION:An optical axis setting circuit LSC containing a variable resistor VR1 for setting optical axis is provided on a front panel and connected through wirings la-lc to resistor voltage devision circuit VDC provided in optical axis adjusting circuit. Setting voltage Vs from circuit LSC (voltage between connecting terminals Tb, Tc) is provided together with detection voltage Vd from resistor VR3 for detecting optical axis to comparators COM1, COM2 to produce voltage corresponding to the difference from COM1 if Vs>Vd and from COM2 if Vs<Vd. If Vs>Vd, turning on of transistor Q1 will cause excitation of relay RL1 to close contact Ma thus to rotate motors M1, Mr for varying optical axis of left/right head lights forwardly. |
