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JPS5752297

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DESCRIPTION JPS5752297
Description 1, title of the invention
Speaker device
3. Detailed Description of the Invention The present invention relates to a speaker device applied
to a public announcement system or the like. A conventional loudspeaker device, for example a
band loudspeaker, consists of a magnetic core, permanent magnets mounted on this core and a
plurality of pole caps. A vibrating band is mechanically attached between the lids and further
electrically connected to the signal source. However, conventional band loudspeakers have the
disadvantage that the temperature conditions at which the vibrating bands operate are
disappointing, which limits the possibility of increasing the power of the loudspeaker. The
present invention has been made in view of the above-mentioned circumstances, and an object
thereof is to provide a speaker device which gives a preferred temperature condition for the
vibration band and increases the power. According to the speaker device of the present
invention, the magnetic core, the permanent magnet deposited on the core and the magnetic pole
lid are provided. A vibratory band is mechanically attached between the lids, and the vibratory
band is pneumatically connected to the signal source. The whole area grids are respectively
provided on both sides of the pole cover. These grids EndPage: 1 are made of a nonmagnetic
material such as aluminum or brass. Therefore, according to the present invention, there is a
main advantage that the temperature condition when operating the vibration band 帯 5 is
improved and the power of the speaker device can be increased. An embodiment of the present
invention will be described below with reference to the drawings. Reference numeral 1 is a
magnetic core of the speaker, and a permanent magnet 2 is attached on the magnetic core 1. A
plurality of magnetic pole lids 3 are provided on the permanent magnet 2. A vibration band 4 is
mechanically attached between the mounts 3 and the vibration band 4 is electrically connected
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to a signal source (not shown). For example, two grids 5 are provided on both sides of the pole
cover 3 respectively. These grids 5 are made of nonmagnetic material, such as aluminum, for
example, brass. When a single power is supplied, a current flowing through the vibration band 4
generates a magnetic field. This magnetic field interacts with the magnetic field formed by the
permanent magnet 2 so that the vibration tJ 4 vibrates to generate a hoarse frequency signal
(power). Since the efficiency of the speaker arrangement is low, substantially all of the supplied
power is converted to heat in the vibration band 4. Therefore, the vibration band 4 is heated and
immediately becomes the weir temperature. The nonmagnetic metal grid 5 provided on both
sides of the magnetic pole attachment 30 dissipates the heat of the most part of the vibration
band 4 so that the heat consists of the magnetic core 1, the permanent magnet 2 and the pole
cover 3 It is transmitted to the magnetic system.
As a result, the temperature of the vibration band 4 can be reduced, and the power supplied to
the speaker device can be increased.
4 is a cross-sectional view of an embodiment of the present invention, a simple illustration of the
drawing. 1 · · Magnetic core, 2 · · · Permanent magnet, 3 · · · · · · · · · · · · · · · · · · · · · · · · · vibration
band, 5 · · · non-magnetic metal grid. Applicants Attorney Attorney Takeshi Suzue 1st page
continued 0 Inventor Anastasia Nicolaeva Tercieva Bulgaria Sophia Bowl 9-Tee Combless Su-BK
23-23 2
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