| 摘要 |
PURPOSE:To make the sight of a rear window securable in optimum conditions at all times, by making up a driving gear so as to operate a rear window wiper whenever a car speed becomes slower than the specified value of speed. CONSTITUTION:When a switch 5 controlling the operation of a rear window wiper is selected to an ''AUTO'' position, a logical circuit 4 comes possible to accept a signal to be fed to an input terminal 4a. In time of car running, a signal out of a car speed sensor 1, corresponding to the car speed, is compared with the setting signal written in a memory 2 by a comparator 3, and when the car speed is below the setting value (for example, 20km/h), an output signal is emitted out of the comparator 3. With this, a rear window wiper 6 is driven via the logical circuit 4 and the rear window is wiped clean. On the other hand, when the car speed goes beyond the setting value, the rear window wiper 6 stops its operation at once. |
