Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers
Patent
1987-04-09
1989-08-22
Moore, David K.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Plural or compound reproducers
381 87, 181148, H04R 102
Patent
active
048603694
ABSTRACT:
A flat speaker device having a flat speaker unit fitted into a through-hole for mounting a speaker of a wall surface board having its back secured to a wall surface leaving a specific spacing therebetween, the flat speaker unit comprising a total-drive type flat speaker comprising a plurality of magnets juxtaposed on a plane and a diaphragm formed from a plurality of projections for respectively covering the plurality of magnets, a speaker frame with a mounting flange mounted on the flat speaker so as to encircle the outer periphery of the flat speaker, rod-like screw members mounted so as to pass through the speaker frame from the front surface towards the back, and swining blades each disposed on the back of the speaker frame with one end threadedly engaged with a respective rod-like screw member and having a length such that when the blade is swung outwardly of a diagonal line of the speaker frame, the tip portion of the blade extends outwardly from the speaker frame.
REFERENCES:
patent: 1997408 (1935-04-01), Holmes
patent: 2224023 (1940-12-01), Sayen et al.
patent: 2917267 (1956-12-01), Riddle
patent: 4228327 (1980-10-01), Sawafuji
patent: 4484658 (1964-11-01), Grote
patent: 4672675 (1987-06-01), Powell et al.
Koike Akio
Koshimura Katsumi
Kabushiki Kaisha Seidenko
Moore David K.
Oberley Alvin
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