| 摘要 |
PROBLEM TO BE SOLVED: To exhibit a maximum temperature difference between a heat receiving part and a heat radiating part. SOLUTION: An inner ring-shaped extension 51 and an outer ring-shaped extension 52 are formed at the lower peripheral edge of an upper shell 5. A heat conducting plate 53 is mounted on the inner ring-shaped extension 51. A thermoelectric generator 9 is adhesively secured to the heat conducting plate 53. A back lid 7 is secured to the lower surface of a lower shell 6 and adheres to the thermoelectric type generator 9. A ring-shaped projection 64 is formed on the lower shell 6, the outer surface of the projection 64 engaging the outer ring-shaped extension 52 of the upper shell 5. The space between the outer surface of the ring-shaped projection 64 and the inner surface of the outer ring-shaped extension 52 is sealed by a plastic gasket 65. The ring-shaped projection 64 except its upper surface has clearance C to the upper shell 5. A ring washer 55 is secured by a screw 54 to the inner ring-shaped extension 51, together with the heat conducting plate 53. With the ring washer 55 fixed in place, a projecting pawl part 56 engages the seat part 66 of the lower shell 6 to secure the lower shell 6 to the upper shell 5. |
