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Sports implement, amusement tool, and training tool

  • US 8,678,958 B2
  • Filed: 02/25/2005
  • Issued: 03/25/2014
  • Est. Priority Date: 02/26/2004
  • Status: Expired due to Fees
First Claim
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1. A sports implement comprising:

  • an EL display portion;

    a piezoelectric element which generates electric power by warping the piezoelectric element due to a vibration or impact applied thereto;

    an amplifier circuit operationally connected to the piezoelectric element;

    an instruction unit including a switch configured to determine whether or not to control strain of the sports implement; and

    a charging control circuit and a secondary battery for storing the electric power,wherein the instruction unit is configured to be turned on and off by a user,wherein the amplifier circuit and the piezoelectric element are formed on a same flexible film, andwherein the flexible film, the amplifier circuit, and the piezoelectric element are attached onto a curved surface of the sports implement.

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