Acoustics – Diaphragm and enclosure – Rounded enclosure
Reexamination Certificate
2001-04-11
2003-05-27
Lockett, Kim (Department: 2837)
Acoustics
Diaphragm and enclosure
Rounded enclosure
C181S155000, C181S156000
Reexamination Certificate
active
06568502
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a sounder adapted for use in speakers, alarms, or horns and, more specifically, to such a sounder, which eliminates the drawbacks of complicated structure, low performance and bulky dimension of conventional speakers that comprise speaker shell, end block, magnet, coil, cone, vibration dust diaphragm, etc.
In the modern society, different voice frequency devices have been disclosed, and are intensively used to transmit voice message. These voice frequency devices include simple sound heads for producing sound and speakers for amplifying sound.
The performance of an audio system depends on the quality of its main unit, amplifier, and speakers. More particularly, the speakers of an audio system determine the quality of output sound. A speaker converts electric voice signal into sound audible to the ears.
FIG. 1
illustrates the structure of a conventional speaker. As illustrated, the speaker comprises a casing
10
, a paper cone
12
, and vibration dust diaphragm
13
. The casing
10
comprises an outwardly expanded front bracket
14
and a rear end block
11
. The rear end block
11
defines a receiving chamber
15
, which receives a magnet
16
, and a coil
17
around the magnet
16
. The paper cone
12
is adhered to the bracket
14
. A gasket ring
19
is adhered to the bracket
14
and a part of the paper cone
12
. The paper cone
12
has a hole
18
aimed at the magnet
16
. The vibration dust diaphragm
13
is adhered to the paper cone
12
and covered over the hole
18
. The coil
17
has lead-out wires
171
extended through the paper cone
12
and connected to power source connector (not shown). After power signal has been transmitted to the magnet
16
, different current signals are provided to the magnet
16
, causing the magnet
16
to move lefts and rights at different distances, thereby causing the vibration dust diaphragm
13
and the paper cone
12
to vibrate and the produce audible sound. There is known another structure of speaker in which metal voice coil is directly installed in the receiving chamber
15
and adapted to produce sound when electrically connected. These conventional speakers are still not satisfactory in function. The drawbacks of these conventional speakers are outlined hereinafter:
1. Complicated structure: As indicated above, a conventional speaker is comprised of a casing, a magnet, a coil, an end block, a paper cone, a vibration dust diaphragm, and etc. According to conventional designs, the coil acts on the magnet subject to the volume of electric current, causing the magnet to displace, so as to further vibrate the vibration dust diaphragm and the paper cone. A speaker constructed subject to this structure is complicated.
2. Bulky and heavy: The installation of the end block and the magnet greatly increases the weight of the speaker. The end block protrudes over the rear side of the speaker, and adapted to support stable displacement of the magnet. Because the end block supports stable displacement of the magnet, it has a certain weight.
3. Low heat dissipation effect and high sound wave distortion: Because the vibration dust diaphragm seals the receiving chamber to achieve a sound box effect, it prohibits quick dissipation of heat from the receiving chamber, and accumulation of heat may cause distortion of sound waves.
The sound head of a broadcasting or alarm speaker produces sound by means of potential difference. A broadcasting or alarm speaker is portable and, effective to produce high level of sound.
FIG. 2
shows a sound head according to the prior art design. As illustrated, an annular rib
23
is provided at the front side of the shell
20
to support a cone
24
, and a cover
21
with sound holes
22
is covered on the front side of the shell
20
. A sound disk
26
is adhered to the rear end of the cone
24
by bonding glue
25
. The sound disk
26
has a circuit (piezoelectric transducer) on it, and lead-out wires
27
for connection to power source. When electrically connected, potential differences cause vibrations to produce sound. Because the sound disk
26
has its center area adhered to the cone
24
, the vibration of the sound disk
26
is constrained. Further, because the amplitude of the sound disk
26
is limited and far away from the cone
24
, the transmission of sound effect is less efficient.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a sounder, which eliminates the drawbacks of the aforesaid conventional designs. According to one aspect of the present invention, the sounder is comprised of a cone and a sound disk. The cone has a conical peripheral wall with a flat base. The flat base has a diameter smaller than the sound disk. The sound disk is adhered to the conical peripheral wall of the cone, defining with the flat base a sound chamber. When used in a speaker, the invention eliminates the installation of an end block in the casing, and therefore the size and weight of the speaker are greatly reduced. The sounder can be used with a cover, a vibration diaphragm, an inner body, a cushion, and cap to form a compact sound head.
REFERENCES:
patent: 4169516 (1979-10-01), Honda
patent: 4673057 (1987-06-01), Glassco
patent: 4939935 (1990-07-01), Amand
patent: 5962786 (1999-10-01), LeTraon et al.
patent: 6186269 (2001-02-01), Vollmer et al.
patent: 2685964 (1996-06-01), None
patent: WO93/20413 (1993-10-01), None
Bacon & Thomas PLLC
Lockett Kim
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