Piezoelectric speaker
First Claim
1. A speaker for generating sound comprising:
- a casing;
a cover member;
a diaphragm integrally formed with a selected one of said casing and said cover member;
a speaker driving element supported on said diaphragm; and
means defining a transverse wall between said casing and said cover member and forming a sound transmission channel, said channel having an inlet portion disposed in communication with said diaphragm and an outlet opening to atmosphere, said channel having an increasing cross sectional area between said inlet portion and said outlet opening.
1 Assignment
0 Petitions
Accused Products
Abstract
A piezoelectric speaker includes a casing and cover member having a transverse wall extending therebetween which forms a sound transmission channel having a spiral curved or double reverse bend shape and being of substantially continuously increasing cross sectional area between an inlet portion of said channel and an outlet opening to atmosphere. A driver element comprising a diaphragm formed of fiber reinforced epoxy, polyester or ABS resin has a piezoelectric ceramic disk secured thereto and supported in a recess formed on the cover member. A sound transmission opening in the cover member communicates with the inlet portion of the sound transmission channel. The diaphragm may be formed integral with the cover member. The speaker has the capability of expanding the frequency band width of audible sound at relatively high sound pressure levels.
75 Citations
10 Claims
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1. A speaker for generating sound comprising:
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a casing; a cover member; a diaphragm integrally formed with a selected one of said casing and said cover member; a speaker driving element supported on said diaphragm; and means defining a transverse wall between said casing and said cover member and forming a sound transmission channel, said channel having an inlet portion disposed in communication with said diaphragm and an outlet opening to atmosphere, said channel having an increasing cross sectional area between said inlet portion and said outlet opening. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A speaker for generating sound comprising:
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a casing; a cover member; a speaker driver assembly including a diaphragm integrally formed with a selected one of said casing and said cover member; and means defining a transverse wall between said casing and said cover member and forming a sound transmission channel, said channel having an inlet opening coupled to said speaker driving element and an outlet opening coupled to atmosphere, said transverse wall means forming at least two reverse bends in said channel between said speaker driving element and said outlet opening. - View Dependent Claims (9, 10)
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Specification