Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-09-25
1994-12-27
Lobo, Ian J.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310324, 381190, H04R 1700, H04R 120
Patent
active
053768531
ABSTRACT:
Disclosed is an electroacoustic transducer which comprises a diaphragm including an elastic plate, an added mass secured to a center portion of the elastic plate. The added mass has a contact portion, which contacts the elastic plate and is shaped to provide a portion to allow for deformation of the elastic plate within an imaginary circle defined by connecting an outer surface portion of the contact portion. Thus, the contact portion can provide a deformable elastic-plate portion within that circle. In other words, it is possible to accomplish such a structure obtained as if by connecting different springs having different spring characteristics, located outside and inside the circle. This structure can suppress and stabilize a variation in resonance frequency (f.sub.0) caused by a change in the amplitude of the diaphragm. The follow-up reproducibility of an output to an input is thus improved enough to cope with the case of using the electroacoustic transducer for AM sounds or attenuating sounds.
REFERENCES:
patent: 4211947 (1980-07-01), Ikeno et al.
patent: 4218631 (1980-08-01), Yamaguchi
patent: 5118981 (1992-06-01), Kobayashi et al.
Lobo Ian J.
Star Micronics Co. Ltd.
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