Control device for an electrically powered foldable rearview mirror for automobiles
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
May 26, 1995
filing date -
Aug 3, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The control device controls an electrically powered foldable rearview mirror in which a mirror body is reversibly rotatable around a shaft by an electric motor contained in the mirror body and in which the mirror body rotation is stopped in a predetermined erected position and folded position by rotation stop devices. The control device for controlling mirror rotation includes a switching circuit for switching the power supply connections to the motor to rotate the mirror body in one of two direction, a relay circuit for supplying and cutting off power to the motor and a relay control circuit connected to the relay circuit and the motor. The relay control circuit includes a resistance and a semiconductor device for switching the relay control circuit connected in parallel with the resistance to perform a switching operation when the motor driving electric current is increased due to a stoppage of the mirror body rotation which causes the voltage drop across the resistance to exceed a threshold voltage of the semiconductor device and to open or release the relay cutting off current to the motor.
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