A semiconductor component having a semiconductor body comprises a blocking pn junction, a source zone of a first conductivity type and bordering on a zone forming the blocking pn junction of a second conductivity type complementary to the first conductivity type, and a drain zone of the first conductivity type. A sign is appeared in the movement path of the LED array upon rotation of the LED array with the rotary device at the speed in which the motion cycle of the LED array is smaller than the transient retention time of visual sensation when controlling the control device to turn onoff the display unit. A proximal inlet portion of the filter body has two inlet openings sized to allow blood and embolic material enter the filter body, and a distal outlet portion of the filter body has a plurality of small outlet openings to allow through-passage of blood, but to retain embolic material within the filter body. At least one exclusion region is disposed on a second side of the active region and has a majority carrier of the first conductivity type. It is envisioned that this device may preferably engage and disengage a shaft such as a shaft of a generator or motor.