| 摘要 |
<p>A heater which is easy to handle when in use, small in temperature variation and simple to produce, and which is provided with a cap (20) formed by joining and fixing together curved peripheral edges (10a) as respective peripheral edges of two semi-elliptic heater-containing sheets (10) of generally the same shape, each sheet (10) comprising a waterproof inner layer sheet (2), an air-permeable sheet (5) disposed so as to cover the entire front surface of the inner layer sheet (2) and a plurality of heating elements (3) held between and fixed by the inner layer sheet (2) and the air-permeable sheet (5) and adapted to generate heat on contact with air, the heating elements (3) being distributed over the entire surface of the cap (20), the heater-containing sheets (10) being joined and fixed together with respective inner layer sheets (2) facing inward.</p> |
