Electric toothbrush

Abstract

An object is to provide an electric toothbrush superior in plaque removal, producible at low costs, and utilized without damaging gum even by a patient with gingivitis. In the electric toothbrush (10) making brushing possible by linearly moving a tufted portion (31), the product of the distance (mm) of movement of the tufted portion (31) and the frequency (times) of back-and-forth motion per minute is set in the range of 3000-9000. Further, the distance ((x) mm) of movement of the tufted portion (32) and the frequency ((y) times) of back-and-forth motion per minute are set in a range which satisfies the following formula: y = ax + b, where a = - 3000, 10000 | b | 12500, x > 0.

Description

technical field [0001] The present invention relates to electric toothbrushes. Background technique [0002] As an electric toothbrush, a conversion device that converts the rotational motion of the motor rotating shaft into the axial reciprocating linear motion of the output shaft via a crank mechanism, a gear mechanism, a cam mechanism, etc. is provided, and is widely used as the output shaft of the conversion device. A type in which a replacement brush can be detachably attached (for example, refer to Patent Document 1). Generally, in such an electric toothbrush, the bristle movement distance of the output shaft is set to 3 to 7 mm, and the number of reciprocating vibrations of the output shaft per minute is set to about 1000 to 3000 times. [0003] In addition, recently, electric toothbrushes in which the bristle movement distance of the output shaft is about 1 mm and the number of reciprocating vibrations of the output shaft per minute is about 15,000 times by linear d...

AI Technical Summary

Problems solved by technology

[0005] The electric toothbrush described in the above-mentioned Patent Document 1 can use a general-purpose DC motor driven by a battery or the like, so the electric toothbrush can be manufactured at low cost, and it is also excellent in plaque removal performance, but the moving distance of the bristles is too large , so when used by patients with gingivitis, etc., there is a problem that the gums are reversed and the symptoms worsen

[0006] On the other hand, in electric toothbrushes that use linear drive or magnetic force, the movement distance of the hair bundles on the output shaft is as small as about 1mm, and the gums are less likely to be damaged, but there is a problem that the plaque removal performance is lower than that of ordinary electric toothbrushes. question

In addition, special parts must be used, and thus there is a problem that the manufacturing cost increases

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