Miniature dual cavity ringer

Details Miniature dual cavity ringer Miniature dual cavity ringer

1986-03-24

1988-03-01

Rowland, James L.

Communications: electrical

Audible indication

Diaphragm

340384R, 379375, 381159, G08B 300

Patent

active

047289333

ABSTRACT:
A ringer employs a low-cost miniature transducer, having a reverberant cavity, mounted in a cylindrical housing which has a second reverberant cavity in front of the miniature transducer. A very large acoustic output power is achieved when the ringer is employed in known cordless telephones, using the conventional available 3.9 volts battery. The ringer, due to its small relative size, may fit in the limited space inside a cordless telephone portable unit without costly tooling modifications. It is also suited for other uses, including for employment in compact one-piece telephones. The ringer is substantially more compact, louder in sound level, more pleasant sounding than known devices, and operates from a substantially lower DC voltage source.

REFERENCES:
patent: 2514344 (1950-07-01), Slaymaker et al.
patent: 2808463 (1957-10-01), Jenkins et al.
patent: 2980888 (1961-04-01), Hothem
patent: 3477405 (1969-11-01), Jensen
patent: 3517390 (1970-06-01), Whitehead
patent: 3864532 (1975-02-01), Van Der Plaats et al.
patent: 4157459 (1979-06-01), Bush et al.
patent: 4214131 (1980-07-01), Bush et al.
patent: 4234945 (1980-11-01), Nomura et al.
patent: 4413253 (1983-11-01), Hofer et al.

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