Title: Loudspeaker driver unit

Abstract: A driver unit for a horn type loudspeaker is disclosed. The driver unit comprises a dome-shaped diaphragm and an equalizer positioned on the concave side of the diaphragm. The equalizer has a convex surface adjacent the diaphragm and a plurality of slits extending from the convex surface to an interior, outwardly opening throat. The slits are disposed in equal angular pitch with the outermost slits being located at the edge of the convex surface of the equalizer. The outermost slits are approximately one half the width of the remaining slits, the remaining slits being of equal width.

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Inventors: Nakazono, Jiro (Tokorozawa, JP)
Kodama, Akihiko (Tokorozawa, JP)
Tsuchiya, Yukio (Tokorozawa, JP)

Application Number: 872708
Filing Date: 1978-01-26
Publication_date: 1979-03-13
Assignee: Pioneer Electronic Corporation (Tokyo, JP)
Primary Class(es): 181/159 381/340
Other Classes:
US Patent Ref:

2037187	Apr, 1936	Wente	179/115.
2107757	Feb, 1938	Kinsley	181/159.
2907837	Oct, 1959	Brami	179/115.
2942071	Jun, 1960	Witchey	181/159.
3852529	Dec, 1974	Schafft	181/159.
3991286	Nov, 1976	Henricksen	179/115.
4050541	Sep, 1977	Henricksen	181/159.

Other Refs: 654364784147

Jun, 1951	GB
Oct, 1957	GB

Primary Examiner: Tomsky, Stephen J.
Assistant Examiner:
Attorney: Sughrue, Rothwell, Mion, Zinn and Macpeak