| 摘要 |
The present invention relates to a rotation detecting device for a recording and reproducing apparatus and a method therefor which can easily precisely detect a reel rotation speed by a detecting sensor during a high or low speed rotation, by forming in a series equational division method a wing unit and a space unit of a sensor detecting member. In a rotation detecting device disposed at the recording and reproducing apparatus, and detecting a rotation speed of a rotation body rotated by a driving source, a rotation detecting device for a recording and reproducing apparatus includes: a sensor detecting member rotated in a single body with the rotation body, and provided with a plurality of wing units and a plurality of space units having an identical width, the plurality of wing units consisting of a plurality of wing strips and a plurality of assistant space units having an identical width; and a detecting sensor including a light emitting unit and a light receiving unit, and detecting a rotation speed by passing the plurality of wing units and the plurality of space units between the light emitting unit and the light receiving unit.
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