Acoustics – Diaphragm – Mounting or suspension means
Reexamination Certificate
2000-09-08
2002-07-23
Nappi, Robert E. (Department: 2837)
Acoustics
Diaphragm
Mounting or suspension means
C181S172000
Reexamination Certificate
active
06422337
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a loudspeaker cone, particularly, to a loudspeaker cone which has an annular suspension member made of a laminate having a foam layer covered and strengthened by a cloth layer.
2. Description of the Related Art
It is known in the art to connect a voice coil
7
to a loudspeaker cone
1
′ and to connect the outer marginal edge of the loudspeaker cone
1
′ with a suspension rim
2
′, as shown in
FIG. 1
, so as to mount the loudspeaker cone
1
′ on a support frame via the suspension rim
2
′. Typical materials suitable for making suspension rims include paper, rubber, textile materials, and foams. However, paper is prone to be torn at higher tones or higher amplitude vibrations due to its insufficient strength, and the durability thereof is low in humid environments so that high output power is impossible when paper is used in a suspension rim. Textile materials possess better strength and better formability than paper. But, as resins impregnating the textile materials are of less resiliency and flexibility, sound distortion of sound can occur at high output powers. While foams offer good response to high output powers and low frequencies as compared to paper and textile materials, they have poor strength and low humid-resistance and are susceptible to damage by insects and environmental factors. In addition, foams are color-degradable due to environmental conditions. Rubber works excellently at low frequencies, but has poor response to high frequencies. Moreover, it is prone to degradation due to temperature changes.
SUGARY OF THE INVENTION
An object of the present invention is to provide a loudspeaker cone with a suspension member which is strong, durable, and flexible but still exhibits smooth response to different frequency ranges and minimizes distortion.
According to the present invention, a loudspeaker
10
comprises: a loudspeaker cone having an outer marginal edge; and an annular suspension member of laminated structure, connected to the outer marginal edge and adapted to support the loudspeaker cone on a support frame. The annular suspension member includes a layer of cloth and a first layer of flexible plastic foam integrally bonded to the layer of cloth. The first layer of foam has an inner surface in contact with the outer marginal edge, and the layer of cloth covers an outer surface of the first layer of foam opposite to the inner surface. Preferably, the suspension member further has a second layer of foam between the cloth and the first layer of foam, which is thinner than the first layer of foam. The thickness of the second layer of foam is preferably less than 5 mm.
REFERENCES:
patent: 3757890 (1973-09-01), Dunning
patent: 3804994 (1974-04-01), Turuga
patent: 3892289 (1975-07-01), Rollins
patent: 4324312 (1982-04-01), Durbin
patent: 5099949 (1992-03-01), Mitobe
patent: 5782867 (1998-07-01), Shrock et al.
patent: 6305491 (2001-10-01), Iwasa et al.
patent: 2001/0011615 (2001-08-01), Iwasa et al.
patent: 55075396 (1980-06-01), None
patent: 55075397 (1980-06-01), None
patent: 61101195 (1986-05-01), None
patent: 01290399 (1989-11-01), None
Deccon International Ltd.
Martin Edgardo San
Morgan & Lewis & Bockius, LLP
Nappi Robert E.
LandOfFree
Loudspeaker with a suspension member made of a laminate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Loudspeaker with a suspension member made of a laminate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loudspeaker with a suspension member made of a laminate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2830759