JPS63159340U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram showing a preferred embodiment of this invention. FIG. 2 is a signal level characteristic diagram at point A shown in FIG. 1, and is a characteristic diagram showing the relationship of the signal level at point A with respect to changes in illuminance. Figure 3 1
5 are characteristic diagrams showing time charts of points A to E shown in FIG. 1, and FIG.
Point signal level, Fig. 3 2 shows point B signal level, 3rd
FIG. 3 is a characteristic diagram of the C point signal level, FIG. 3, FIG. 4 is a characteristic diagram of the D point signal level, and FIG. 3 is a characteristic diagram of the E point signal level with respect to time. 1... illuminance sensor, 2... vehicle illumination light, 13...
...Bias resistor, 31... Comparison circuit section, 32...
Delay circuit section, 33... Output circuit section, 34... Reset circuit section, 35... Power supply holding circuit section.

Claims (1)

[Scope of utility model registration request] In an automatic vehicle lighting control device comprising an illuminance sensor that outputs a signal corresponding to the illuminance outside the vehicle, and a control device that controls turning on and off the vehicle illumination according to the output level from the illuminance sensor, the illuminance sensor It has a bias element interposed in the power supply circuit and a comparison circuit section connected to the output section of the illuminance sensor, and the comparison circuit section detects the output of the bias element when the illuminance sensor fails, An automatic lighting control device for a vehicle, characterized in that it is configured to forcibly turn on a lighting lamp.