close

Вход

Забыли?

вход по аккаунту

JPS57155897

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS57155897
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a conventional flat
speaker. FIG. 2 is a half sectional view showing one embodiment of the speaker of the present
invention. 13: Magnetic circuit, 18: Frame, 19: Flat plate diaphragm, 20: Edge, 21: Drive cone, 22:
Horizontal part, 23: Rising part, 24: · · Voice coil, 25 · · · Damper, 2, 6 · · · Magnetic gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat speaker
using a flat diaphragm, and it is an object of the present invention to provide a speaker capable
of controlling the peak of the sound pressure level due to the resonance in the high frequency
band. Conventional flat speakers are as shown in Fig. 1)! It was configured as shown. That is, the
plate 2 having the center pole 1, the ring-shaped magnet 3, and the ring-shaped 7fSj '? A frame 6
is connected to a magnetic circuit crucible constituted by an upper plate 4 and a rim of a flat
plate diaphragm 7 constructed by sticking a skin material on both sides of a core material having
a honeycomb structure or the like on the periphery of the frame 6 The end 8 of the drive unit is
joined by bonding or the like, and the upper end of the drive cone 9 is connected to the nodal
circle at the primary resonance frequency of the lower surface of the flat plate diaphragm 7. 10,
the middle portion of the voice coil 10 is held by a damper 11, and the voice coil 1o is configured
to be inserted into the air gap 12 of the magnetic circuit 6 without eccentricity, t, -t '. k. Although
the reproduction band can be expanded by driving the node circle at the primary resonance
frequency of the flat plate diaphragm 7 in this manner, there is a problem in that the sound
pressure frequency characteristic is flattened. That is, although the characteristics from low to
mid range can be made very flat, the peak of the sound pressure frequency characteristics due to
resonance in the high region is large, and the value is 10 dB or more with respect to the average
sound pressure level. )) This high-breaking peak is a multi-way speaker 090t 3: a big gap when
configuring a system, providing a dip circuit on the filter side or missing at a fairly low
frequency. It was bad. The present invention eliminates the above-mentioned conventional
drawbacks. Hereinafter, one embodiment of the present invention will be described with
11-05-2019
1
reference to FIG. A magnetic circuit 13 includes a plate 16 having a center pole 14, a ring-shaped
magnet 16, and a ring-shaped upper plate 17. A frame 18 is connected to the magnetic circuit
13. A circumferential surface of the frame 18 is bonded to a peripheral portion of a flat plate
diaphragm 19 formed by attaching a skin material to the upper and lower surfaces of a
honeycomb structured core material. The outer peripheral portion of the edge 20 joined by, for
example, is joined. The upper end of Tofifcor / 21 is coupled to the primary resonance frequency
L) of the lower surface of the flat plate diaphragm 19 in the plane of the // lA joint moat. The
drive cone 210914 has an inverted conical shape and has a horizontal portion 22 at its upper
portion, and the upper end of the upward rising portion 23 of the periphery of the horizontal
portion 220 is coupled to the lower surface of the flat diaphragm 19 .
A voice coil 24 is coupled to the lower center of the drive cone 21. A middle portion of the voice
coil 24 is held by a damper 26, and a lower portion of the voice coil 24 is eccentric to the
magnetic gap 26 of the magnetic circuit 13. I'm stuck. As described above, the high cut filter is
provided by providing the horizontal portion 22 on the upper part of the drive cone 21. The peak
value of the high region can be controlled by the shape of the horizontal portion 220, and the
low region to high region The sound pressure frequency characteristics can be made flat. As
described above, since the flat speaker of the present invention is configured, the sound pressure
frequency characteristic can be made flat by slight improvement of the drive cone, and the cost is
not disadvantageous, and the multi-way spin can be realized. Even in the case of constructing a
system, it is not necessary to add a speaker characteristic correction circuit, and the practical
value is increased.
11-05-2019
2
1/--страниц
Пожаловаться на содержимое документа