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Abstract

A fishline length measuring device adapted to a fishing reel having a spool rotatably supported on a reel body for winding and unwinding a fishline thereon. The device has a spool rotation sensor for detecting a direction of the rotation of the spool and for detecting a number of the rotation of the spool, and a ultrasonic wave beam sensor for applying an ultrasonic wave beam onto a surface of the fishline wound on the spool and for receiving the ultrasonic wave beam emitted therefrom and reflected by the surface of the fishline wound on the spool. A timer measures a time period .DELTA.T between the emission and reception of the ultrasonic wave beam by the ultrasonic wave beam sensor. The time period .DELTA.T, the direction of the rotation and the number of the rotation are used for calculating a fishline length wound onto or unwound from the spool due to the rotation of the spool.

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First Claim