| 摘要 |
PURPOSE: A writing tool including a heater is provided to enable a user to use the heater for warming the hands when a writing operation is difficult due to cold weather. CONSTITUTION: A writing tool including a heater comprises a heating circuit including the following: power supply units(11,11a) supplying the power; a power transfer unit(20); heaters(40,50); a temperature controlling unit(30) to prevent overheating; and a switch for turning on/off the circuit. A separate heater is installed on a pen lead including a heating spring when using a writing tool with a ballpoint. |
