| 摘要 |
<p>PROBLEM TO BE SOLVED: To heat the surface of a keyboard to an adequate temp. and to efficiently execute a lessen by forming the heating section of a heater to a film form and disposing this heating section between a keyboard body and a keyboard skin. SOLUTION: The heater 10 is composed of the heating section 7 and lead wires 6. The heating section 7 consists of a heater film 7a and a protective film 7b. This heater film 7a consists of a heating material, such as a material formed by winding and wiring a nichrome resistor therein, and is electrically connected to a power source circuit 9 in a piano body through the lead wires 6. The heating section 7 and the lead wires 6 are so formed as to be snugly housed into the recessed parts 5a and 5b of the keyboard body 5. The heater film 7a is heated by such connection. The surface of the film, i.e., the surface of the keyboard 2 is warmed by the generated heat via the protective film 7 and the keyboard skin 3 and eventually the adequate warmth is imparted on the player's fingers at the time of playing.</p> |
