Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Driven diverse static structure
Reexamination Certificate
1999-01-27
2001-04-17
Le, Huyen (Department: 2643)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Driven diverse static structure
C381S429000, C381S397000
Reexamination Certificate
active
06219425
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a loudspeaker with a heat radiation hole suitable to be employed in a computer unit or other electronic devices which requires down-sizing or space saving, and electrical equipment employing such loudspeaker.
2. Description of the Related Art
Conventionally, as an electrical acoustic transducer (hereinafter referred to as speaker), there has been known those of the types called cone loudspeaker or, horn loudspeaker. There are various transducing principles to be employed in the loudspeakers. A cone loudspeaker as the most typical loudspeaker, is one called as dynamic direction radiation speaker. Such loudspeaker drives a cone by applying a signal current to a coil as a part of a vibration system held in a magnetic field of a permanent magnet
9
to generate an acoustic sound, as shown in a section of FIG.
3
.
A frequency characteristic of the loudspeaker is variable depending upon a magnet
9
, a coil
18
, quality and shape of a cone
15
, and supporting structure of the cone. In
FIG. 3
, the magnet
9
is fixed within a space defined by a yoke
10
and a yoke plate
11
. The coil
18
is wound on a pole guide
19
for axial reciprocal motion relative to a pole piece
8
. The cone
15
is fixed on a frame
12
at an outer periphery via a gasket
13
and an edge
14
. An inner peripheral edge of the cone
15
is secured on the pole guide
19
and is elastically coupled with the frame by a damper
7
. On the other hand, a cap
17
is provided at the center portion of the cone
15
.
The cone loudspeaker constructed set forth above includes those having dome shaped or ribbon shaped vibration surface. In addition, there are loudspeakers applying an electrical signal between a stationary electrode and an electrically conductive film (vibration plate) stretched with a small gap from the stationary electrode for driving the film by variation of electrostatic force to cause vibration for radiating an acoustic vibration, as a static loudspeaker, electromagnetic type, piezoelectric type, ionic radiation type and so forth. These loudspeakers serve for converting electrical signal into acoustic vibration (audible sound).
In the meanwhile, in the electronic devices, such as recent personal computers or the like, a demand for a function to express information using high level image and/or sound adapting for increasing multimedia information, has been growing. Furthermore, due to grading up of information to be expressed, demanded specification for input/output performance and characteristics of video and audio information become higher progressively. Furthermore, in order to adapt for down-sizing demand of the overall system, it is required to integrally form a high performance loudspeaker with the electronic device.
However, when the conventional loudspeaker is integrally formed with the electronic device in integrating the high performance loudspeaker and the electronic device, large installation area and space becomes necessary for the speaker to make the overall device bulky. Also, in integration of the loudspeaker with the electronic device, constraints for shape and so on become quite severe to cause difficulty in obtaining desired output characteristics. Furthermore, since the casing and internal construction of the electronic device has to be optimized adapting demanded characteristics of the loudspeaker to be constraints for designing and manufacturing.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a loudspeaker superior in space saving ability for enabling down-sizing of a device, to which the loudspeaker is employed, and an electronic device using the same.
Another object of the present invention is to provide a loudspeaker having frequency characteristics easily designed and adjusted.
According to the first aspect of the present invention, a loudspeaker comprising:
a vibration plate formed with a plurality of heat radiating through openings; and
a vibrating portion responsive to an input electrical signal and driving the vibration plate for generating an acoustic vibration.
In the preferred construction, geometry of a plurality of heat radiating holes is selected depending upon a desired frequency characteristics of the loudspeaker. A physical property of a plurality of heat radiating holes may be selected for obtaining the selected geometry. In the alternative, a distribution of a plurality of heat radiating holes may be selected for obtaining the selected geometry. A size or shape of each individual heat radiating hole may be adjusting for obtaining the selected physical property of a plurality of heat radiating holes. An interval between mutually adjacent heat radiating holes may be selected for obtaining the selected distribution of a plurality of heat radiating holes, or in the alternative, number of heat generating holes to be formed through the vibration plate may be selected for obtaining the selected distribution of a plurality of heat radiating holes.
According to second aspect of the present invention, an electric device comprises:
a casing housing functional components therein;
a built-in loudspeaker including:
a vibration plate forming a part of wall of the casing, the vibration plate being formed with a plurality of heat radiating holes determining frequency characteristics of the loudspeaker and serving for radiating internal heat of the electric device; and
a vibrating portion driving the vibration plate for generating an acoustic vibration.
The electronic device may further comprise a cooling fan for generating a cooling air flow across the functional components and to be discharged through the heat radiating holes.
REFERENCES:
patent: 4551849 (1985-11-01), Kasai et al.
patent: 5748760 (1998-05-01), Button
patent: 5792999 (1998-08-01), Arnold et al.
patent: 5828768 (1998-10-01), Eatwell et al.
patent: 8-223678 (1996-08-01), None
Le Huyen
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
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