Paging receiver with resonant box

Details Paging receiver with resonant box Paging receiver with resonant box

1991-11-20

1993-11-09

Crosland, Donnie L.

Communications: electrical

Audible indication

Diaphragm

340393, 340394, 3403111, G08B 300

Patent

active

052606813

ABSTRACT:
A paging receiver provided with a speaker unit including a first resonant box and a second resonant box in order to produce a higher sound pressure without however enlarging a casing of the receiver body is disclosed. The second resonant box is formed made in a hollow space of a mold for fixing a holder to the casing of the paging receiver and is provided with slits to resonate in response to the sound wave outputted from the first resonant box at either input or output portion of the sound wave.

REFERENCES:
patent: 4142186 (1979-02-01), Sweany et al.
patent: 4183017 (1980-01-01), Sims
patent: 4409588 (1983-10-01), Hofer et al.
patent: 4700177 (1987-10-01), Nakashima et al.

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