Luminous device capable of automatically generating power

A luminous device capable of automatically generating power installed on a wheel disposed with wheel spokes and steel wires comprising:

• an induction coil having a shaft with coils and a single magnet pole;
• the single magnet pole inserts into the shaft and which has one end extends to define a convex piece;
• a luminous element connects with a fuse of the coils and is disposed onto the convex piece of the shaft;
• a light conductor with a receiving portion at its distal end receiving the induction coil of the luminous element;
• a plurality of magnets are disposed inside an assembled magnet case which is secured on to a wheel frame to make the magnets and the induction coil induct with each other;
• wherein a fastening structure is disposed on outer rims of a receiving portion of the light conductor and has a retaining member retained onto the steel wires;
• an extendable catching body is inserted at a front end of the light conductor and has a movable catching piece thereof fit with a catching tooth disposed at the front end of the light conductor;
• clamp openings are disposed on two lateral sides of the extendable catching body;
• the extendable catching body pushes against a steel ring area thereby clamping the clamp openings onto the steel wires and presses the movable catching piece to stop at the catching tooth so as to precisely and steadily hold the luminous device between the steel wires of the wheel,
• when the wheel spins, it rotates the light conductor thereby making the induction coil inside the light conductor and the magnets on the assembled magnet case induct to generate electric current, further driving the luminous element and guiding the light source of the luminous element outwardly via the light conductor so as to provide a luminous and warning effect.