Communications: electrical – Tactual indication
Patent
1993-08-02
1996-01-30
Swarthout, Brent A.
Communications: electrical
Tactual indication
3403111, 34082544, 34082546, 310311, H04Q 130
Patent
active
054883512
ABSTRACT:
A miniature vibrator (50) for a wrist (10) worn alerting device (20) such as a pager produces a rocking motion vibratory alert. The vibrator (50) has a pair of cantilevered piezoelectric resonant vibrators (62, 64, 66 and 72, 74, 76) which are driven by separate drivers (34, 38) at a frequency determined by a frequency generator (32) but at opposite phases because of an inverter (36). Since the vibrating masses (64, 74) move in opposite directions (200, 210), translational movement of the alerting device (20) is substantially eliminated and a resulting rocking motion produces an improved vibratory sensation on the wrist (10) of the user. Additionally, driving the resonant vibrators (62, 64, 66 and 72, 74, 76) at opposite phases results in reduced surge currents (150) on the battery (40).
REFERENCES:
patent: H1173 (1993-04-01), Davis et al.
patent: 2513899 (1950-07-01), Taylor
patent: 3336529 (1967-08-01), Tygart
patent: 3445843 (1969-05-01), Pena
patent: 5172092 (1992-12-01), Nguyen et al.
4.sup.re Congr'es Europeen de Chronometrie, 29-30 Oct. 1992, entitled "Development of Ultrasonic Motor and Application to Silent Alarm Analog Quartz Watch" issued to Masao Kasuga et al.
Graham-Meighan Margaret
Hedayatnia Mostafa
Floam D. Andrew
Lefkowitz Edward
Motorola Inc.
Swarthout Brent A.
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