PURPOSE: To allow characters to be clearly visible even at a dark place by emitting a black light to the characters drawn in a fluorescent paint or the like.

CONSTITUTION: Characters 2 are drawn on a speaker cone 3 in a fluorescent paint or the like and a black light 1 is used to illuminate the characters 2 even at night. Furthermore, the fluorescent paint is drawn also to an edge 4. Furthermore, the position of the black light 1 is changed to bring the characters 2 to the center. The black light l is installed anywhere within a light emission range without being bound by location and a pattern or the like is applied within a range not giving effect onto the sound quality. Through the constitution above, moving characters or patterns drawn on the speaker in matching with music are enjoyed at night.