Patent ID: 7353104

Claim:
A signal output unit comprising: an angle counter configured to perform a count operation in synchronization with a rotation of a rotary body and to output an angle count value indicating a rotation angle of the rotary body; a first register in which a first comparison value is set, which is compared with the angle count value; a first comparator configured to compare the angle count value with the first comparison value, and to output a first comparison matching signal when the angle counter value reaches the first comparison value; a time counter configured to perform a counting operation every a regular interval and to output a time count value; a second register in which a second comparison value is set, which is compared with the time count value; and a second comparator configured to compare the time count value with the second comparison value, and to output a second comparison matching signal when the time count value reaches the second comparison value, wherein the signal output unit inverts a specified level of an output signal thereof and outputs the output signal of the inverted level outside when the first comparator outputs the first comparison matching signal and the second comparator outputs the second comparison matching signal.