A light carrying ring or ring segment is mounted onto a cover used over the rotor of a disc brake on a front wheel of a motorcycle. Delay elements delay the clock signal into delayed clock signal. Another embodiment is a device for active impedance matching comprising a current driver having an output connected to a load, means for detecting an output voltage from the current driver to the load, means for scaling the detected output voltage by a scaling value, and means for subtracting a value representing the scaled detected output voltage from an input signal of the current driver. In addition, multiple data objects can be associated with various transformation functions andor compressiondecompression techniques. The count unit decides digital data of the pixel signal in a 1 LSB step by storing a count value at a point when the comparison processing is completed for any one of the plural kinds of reference signals and correcting the stored count value on the basis of results of the comparison processing for respective remaining reference signals of the plural kinds of reference signals. Burner assemblies having burners therein are located by and supported on the drip pan.