| 摘要 |
PROBLEM TO BE SOLVED: To secure easy extraction when extracting a battery by reducing holding force while securing a force required to hold it by changing holding force by attaching and detaching a battery lid. SOLUTION: This battery case is a cylindrical case equipped with power supply batteries 3, 4 housed in a battery housing part, a battery lid 2 embedded in a screw part provided in the periphery part of the battery housing part, and a substrate 10 on which an electronic circuit operated by receiving supply of power from the power supply batteries. An electrode 42 having spring properties which is connected to the substrate equipped with the electronic circuit is provided, and a spiral coil spring electrode 41 forming a counter electrode connected to the substrate is provided at a position facing the spring-shaped electrode. The power supply battery is inserted between the electrode having spring properties and the spiral coil spring electrode, and when the battery lid is screwed in the cylindrical device, the spiral part of the spiral coil spring is pushed by pushing a projecting part provided in the inside of the battery lid, and thereby the spiral part is combined with the battery to hold the power supply battery by working together with repulsive force of the electrode having spring properties. COPYRIGHT: (C)2008,JPO&INPIT
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