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AssigneeTelefonaktiebolaget LM Ericsson
InventorsHenning M. Schmidt, Hans G. Malmkvist, Arvi J. Aksberg, Jan H. Johansson
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A lead frame for an electric microphone which includes an H-shaped structure of thin metallic material including spaced parallel legs and a crossbar therebetween. A first plate is spaced from the crossbar and is located between the legs. A lead connects the first plate to the crossbar. A second plate is spaced from the first plate and is connected thereto by a lead. All of the above structure is monolithic and coplanar being formed of a thin metallic material. The second plate is provided with holes and a amplifier chip is mounted on the first plate. Leads are provided connecting the chip with the aforesaid legs. The above structure is entrapped between two case halves and a metallized film is supported between the halves and in spaced parallel relationship with the second plate being supported on distant pieces. A cover encircles the case halves.
In an electret microphone comprising an electret, a rear electrode and an amplifying unit including a signal input, a lead frame including signal output terminals for the microphone and for conductively connecting the electret to the signal input of said amplifying unit, said frame including a first plate (5) for supporting said amplifying unit, a second plate (7), conductive means (6) for conductively connecting said first plate to said second plate (7), said second plate constituting said rear electrode in the microphone, a pair of ribbon-like leads (2a, 2b) constituting said output terminals, and means (9, 21a, 21b) for conductively connecting said leads (2a, 2b) to said amplifying unit.
A lead frame for an electret microphone comprising an H-shaped structure of thin metallic material including spaced parallel legs and a crossbar therebetween, a first plate spaced from said crossbar and located between said legs, a lead connecting said first plate to said crossbar, a second plate spaced from said first plate, and a lead connecting said plates.
Dependencies are inferred from the claim text.