Stirring device
AssigneesKabushiki Kaisha Toshiba, Toshiba Ceramics Co., Ltd.
InventorsKyuji Rokugawa, Morito Inoue, Soichiro Sakaguchi, Hideo Oya, Noboru Aoki, Masato Saitoh
Life of this patent
Estimating the term…
Abstract
Piezoelectric elements are attached to both sides of a flexible metal thin plate, thus forming a bimorph-type piezoelectric vibrator. A portion of the metal thin plate is extended to form a stirring blade. A suitable weight is attached to a part of the metal plate such that the amplitude of the blade is made greater than the amplitude of the vibrator itself. The voltage to be applied to the vibrator and the frequency are adjusted, and the vibrator is vibrated in a second-order mode. Thereby, the entire solution is moved simultaneously, vertical motion is caused, and the stirring efficiency is enhanced.
Claims22
A stirring device for stirring a solution, comprising:
- a flexible plate constituting a main portion and a stirring portion formed as a single unit;
- and
- a piezoelectric element attached to a surface of the main portion of said flexible plate for vibrating the stirring portion at a higher order mode defined by any of several higher order modes of a resonant frequency other than a first order, wherein said flexible plate comes into contact with said solution during said stirring of said solution.
A stirring device for stirring a solution, comprising:
- a flexible plate constituting a main portion and a stirring portion formed as a single unit;
- and
- vibration means attached to a surface of the main portion of said flexible plate for vibrating the stirring portion at a higher order mode defined by any of several higher modes of a resonant frequency other than a first order, wherein said flexible plate comes into contact with said solution during said stirring of said solution.
A stirring device comprising:
- a flexible plate having one end portion to be positioned in a vessel for a solution to be stirred and the other end portion fixed over the vessel;
- and
- a piezoelectric element attached to a surface of the other end portion of said flexible plate for vibrating the one end portion of said flexible plate at a higher order mode defined by any of several higher modes of a resonant frequency other than a first order, wherein said flexible plate comes into contact with said solution during said stirring of said solution.
A stirring apparatus comprising:
- a stirring plate being flexible and constituting a single unit having a portion extendable into an aqueous solution for stirring said aqueous solution and having first and second major surfaces opposed one another;
- a first piezoelectric element formed on said first major surface of the stirring plate in an area away from the portion extendable in the aqueous solution;
- a second piezoelectric element formed on said second major surface of the stirring plate in an area away from the portion extendable in the aqueous solution;
- and
- wherein, said first and second piezoelectric elements sandwich the stirring plate and swing the stirring plate when alternately charged by an operating means which drives the stirring plate at a higher order mode defined by any of several higher order modes of a resonant frequency other than a first order between to discreet maximum positions generating a bimorphic-type piezoelectric vibrator.
Dependencies are inferred from the claim text.