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`200551553118010l7:33/EE17105/)I§§%5306128465 P 46
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`30
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`ABSTRACT
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`In an electric toothbrush in which a disk-like brush body is
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`reciprocally rotated about an axis intersecting at a predetermined
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`angle in a line extended in a longitudinal direction of a grip portion, a
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`head portion put into user's mouth is made smaller or thinner, a
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`rotation shaft of the brush body and a head portion are enabled incline
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`at an optional angle. with respect to the grip portion, and transmission
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`efficiency of driving force is increased. For there purposes, an
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`eccentric member having an eccentric shaft is fixed on a driving shaft
`of a motor, a joint portion formed at a first end portion of a lever
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`member is made point contact with the eccentric shaft, so that the
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`rotation movement of the eccentric shaft is converted to swing
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`movement of the first-end portion of the lever member.
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`In addition,
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`a groove formed at a secondrend portion of the lever member and a
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`pin provided on the brush body are engaged with each other, so that
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`swing motion of the second end portion of the lever member is
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`converted to reciprocal rotation motion of the brush body.
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