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JPS55115194

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DESCRIPTION JPS55115194
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker, FIG. 2 is a sound pressure frequency characteristic diagram of the conventional speaker
and the speaker of the present invention, and FIG. 3 is a half cross-sectional view of the main part
of the conventional speaker. Fig. 4 shows velocity characteristics at points A, B and C in Fig. 3,
Figs. 5a, 5b and 5c show vibration modes at respective frequencies of the conventional speaker,
and Figs. FIG. 10 apb is a perspective view and a half sectional view of the main part of the
speaker in the embodiment of the present invention, respectively. . 1 ...... yoke, 2 ...... center ball,
3-song-magnet, 4 ...... plate, 5 ... song frame, 6 ...... flat diaphragm ,! 7 ...... edge member, 8 ......
connecting plate, 9 ...... coil bobbin 10 ...... voice coil, 11 ...... gum, 12 ..... molding.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
using a flat diaphragm. FIG. 1 shows a cross section of a conventional loudspeaker of this type. In
FIG. 1, 1 is a yoke integrally formed with center pole 2, 3 is an annular magnet fixed to the upper
surface of yoke 1, 4 is an annular plate fixed to the upper surface of magnet 3, An annular
magnetic gap is formed between the inner peripheral surface of the rate 4 and the outer
peripheral surface of the center pole 2 in the groove. The frame 6 fixed to the rate 4 is a circular
plane vibration 'Qt / 2-moving plate, and the diaphragm 6 is supported by the frame 6 via the
edge member 7. Reference numeral 8 denotes a circular connection plate, and the connection
plate 8 is bonded to the lower surface of the diaphragm 6. A coil bobbin 9 is inserted and bonded
to the lower portion of the connecting plate 8 and the voice coil 10 is wound around the coil
bobbin 9 ·. The voice coil 10 is disposed in the magnetic gap portion. 11はダンパーである。 In
FIG. 1, when a signal is applied to the voice coil 10, the voice coil 10 and the coil bobbin / 9
vibrate integrally, and this vibration is transmitted to the diaphragm 6 through the connecting
plate 8 and the diaphragm 6 vibrates. is there. In the speaker using the flat diaphragm 6 as
described above, a node circle occurs in the flat diaphragm 6 at a certain resonance frequency,
and the reproduction band of the speaker becomes narrow. However, if the imaging plate 60
12-05-2019
1
node circle is driven, the diaphragm vibrates to the second resonance frequency, and the
reproduction band is expanded. In the conventional example shown in FIG. 1, the diaphragm 6
and the coil bobbin 9 are connected by the connecting plate 8 to drive the node circle of the
diaphragm 6 in order to expand the reproduction band area using a small voice coil and
magnetic circuit. It is intended to However, as shown by the solid line in FIG. 2, the abovementioned conventional loudspeaker has a drawback that a sharp peak occurs at the high
frequency band limit frequency fH in the sound pressure frequency characteristic. FIG. 3 shows
the “&” moving plate 6, the connecting plate 18 and the coil bobbin 90 in the abovementioned conventional example, and the connecting portion A between the vibrating plate 6
and the connecting plate 8 and the connecting plate 8 and the carp, yvgeye (!: When the velocity
characteristics of the tD button ■ ′ ′ w ′ ′, () byl (M79O lower part C are determined, it can
be understood that the cause of the characteristic shown in FIG. 4 and the cause of the sharp
peak in FIG. . 5a, 5b and 5c have frequencies F1... F2. The vibration mode at fH is shown. As is
apparent from FIGS. 5a, 5b and 5c, in the high frequency band, in the vicinity of the connecting
portion B, vibration occurs with nodes X and Y. FIG.
The present invention has been made in view of the above-mentioned point, and a viscous
substance such as rubber is applied in the vicinity of the '-> thread connection portion B without
reducing the efficiency by -'- j power / 4. It is intended to reduce the peak in the affected area,
and an embodiment of the present invention will be described below. In the embodiment shown
in FIGS. 6a and 6b, the inner surface of the coil bobbin 9 in the vicinity of the connecting portion
B is coated with the viscous substance 11. In the embodiment shown in FIGS. 7a and 7b, the
viscous substance 11 is applied to the inner and outer surfaces of the coil bobbin 9 in the vicinity
of the connecting portion B. In the embodiment shown in FIGS. 8a and 8b, the surrounding
material 11 is applied to the coil bobbin 9 and the connecting plate 8 in the vicinity of the
connecting portion B individually. In the embodiment shown in FIGS. 9a and 9b, the viscous
substance 11 is applied to the coil bobbin 9 and the connecting plate 8 in the vicinity of the
connecting portion B. In the embodiment shown in FIGS. 10a and 10b, a cylindrical molding 12
made of a viscous substance and having a sloped surface is adhered in the vicinity of the
connecting portion B. As described above, according to the present invention, a viscous
substance is attached in the vicinity of the connection portion between the connecting plate and
the coil bobbin "+,") y, and a slight viscous substance is used. Since it is attached, it has an
advantage that the peak in the high region can be reduced as shown by a broken line in FIG. 2
without reducing the efficiency.
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