A voltage regulator includes first and second MOS transistors and a bipolar transistor. Also included is a data loop circuit wherein the data loop circuit is activated when the frequency difference between the reference clock and the voltage controlled oscillator circuit is less than about a second threshold. The assembly overcomes the drawbacks associated with filament lamps by using LED lamps that provide greater brightness with less power consumption. Therefore, such a socket can be provided that prevents breakage of the terminal blade-receiving element of the socket due to frequent insertionremoval of the insertion plug and allows for easy repair even if broken. A load applied to the rear ends of the right and left rear frame members is dispersed into the right and left rear frame members and the support frame, and transmitted to the vehicle frame.