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Toothbrush and method of signaling the length of brushing time
| Details |
Inventors: Jung, Philipp;
Assignee: Braun Aktiengesellschaft (Frankfurt, DE)
Primary Examiner: Till; Terrence R.
Assistant Examiner:
Attorney, Agent or Firm: Fish & Richardson P.C.
The invention is directed to a method and an electric toothbrush which includes a timing circuit (7) serving to signal to a user the expiration of a first period (T1), that is, the expiration of the optimum brushing time, following activation of the electric toothbrush. Further, an On/Off switching device (4) is provided which is controllable by the timing circuit (7) and by means of which the electric toothbrush can be turned on and off. The timing circuit (7) controls the On/Off switching go0 device (4) such that following expiration of the first period (T1) the electric toothbrush is turned on and off repeatedly within a second period (T2). As a result, the user of the electric toothbrush "senses" directly the end of the first period (T1), that is, the end of the optimum brushing time, from the variation in the operating mode of the electric toothbrush. |
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DETAILED DESCRIPTION A toothbrush of this type is known from German Offenlegungsschrift DE 33 09 687 A1.
In this specification, a time switch is provided which, based upon the instant the electric toothbrush is activated, emits user-perceivable signals following expiration of a predetermined length of time.
The signals serve the function of indicating to the user the end of the brushing time.
The signals involved are audible and/or visual signals intended to inform the user that the optimum brushing time has elapsed.
Further, the specification describes that the electric toothbrush can be turned off simply automatically upon expiration of the predetermined period.
It is an object of the present invention to provide an electric toothbrush which is further improved in respect of the signaling that the brushing time has expired.
According to the present invention, this object is accomplished in an electric toothbrush of the type initially referred to in that the timing circuit controls the On/Off switching device such that following expiration of the first period the electric toothbrush is turned on and off repeatedly within a second period.
Following expiration of the first period, that is, for example, at the end of the total brushing time or the brushing time for a particular area of the teeth, the electric toothbrush is turned off and turned on again repeatedly, in particular at short intervals.
These actions of turning on and off are maintained for the length of the second period.
Hence, the electric toothbrush is caused to switch from a uniform On mode to a non-uniform intermittent mode.
A user becomes aware of this transistion directly by reason of the changed vibrations of the handle member and the brush head of the electric toothbrush.
The user thus recognizes the end of the brushing time solely from the variation in the operating mode, that is, the predesigned change in vibration of the electric toothbrush or the handle member.
Therefore, the user is no longer required to observe an audible or visual signaling means, "sensing" instead the end of the brushing time "in his or her hand and mouth" readily
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Communications 
