| 摘要 |
<p>PURPOSE:To prevent an unnecessary leakage of current in a backup capacitor by charging the capacitor only when a battery is replaced while the capacitor is not charged in an in-use state. CONSTITUTION:When a battery cover DK is slid as shown by an arrow A, a switch S interlocked with the cover DK moves to turn on, and the capacitor C starts being charged by the battery B. While the battery B is replaced by opening the cover K, the capacitor C is charged sufficiently, and a memory M is backed up with charges accumulated in the capacitor C at the moment the battery B is detached; when a new battery B is installed and the cover DK is closed, the switch S turns off again and the capacitor C is disconnected electrically from the battery B. Therefore, the capacitor C is connected to the battery B electrically only when the cover DK is opened, so no unnecessary leak current flows in the normal in-use state and the life of the battery is prolonged.</p> |
