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    • 5. 发明专利
    • FISHING LINE LENGTH MEASUREMENT APPARATUS OF FISHING REEL
    • JP2002000141A
    • 2002-01-08
    • JP2000190535
    • 2000-06-26
    • DAIWA SEIKO INC
    • NANBU KAZUYACHIBA MAKOTO
    • A01K89/015A01K91/20G01B17/00G01H5/00G01N29/07G01S15/88
    • PROBLEM TO BE SOLVED: To provide a fishing line length measurement apparatus capable of measuring a fishing line length in high accuracy by an ultrasonic sensor without being influenced by a change in an environment of a fishing place while miniaturizing and lightening the whole fishing reel, simplifying the structure of the fishing reel and decreasing a cost in a fishing line length measurement apparatus of a fishing reel. SOLUTION: In this apparatus for measuring a fishing line length of a fishing reel, which emits an ultrasonic wave from an ultrasonic sensor attached to a fishing reel main body to the surface of the wound fishing line of a spool, obtains data of fishing line wound diameter based on a time for the ultrasonic sensor to receive the reflected wave, measures a fishing line length from the data of the fishing line wound diameter and the number of revolutions of the spool obtained by a means for detecting the number of revolutions and displays the fishing line length, the apparatus is characterized in that the apparatus is a speed measurement means for detecting the speed of the ultrasonic wave emitted from the ultrasonic sensor and the data of the fishing line wound diameter are obtained based on the speed of ultrasonic wave measured by the speed measurement means.