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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional flatspeaker, FIG. 2 is a cross-sectional view of a flat panel speaker i according to the present
invention, and FIG. The vibration part 9 of the plan-oblique view, Fig. 4 is this Q, Hirano H----bee
man-? It is a frequency characteristic figure. 21ad peripheral board board 2 coil bobbin, 21))snow is snow '8 board, saw strength 97 false,---
[Detailed description of the invention] This invention is a modified flat-plate speaker 1cImL It is
equipped with 5 diaphragms to increase the lightness and sword property and to have the
transmission loss of the optimum at the time of high-pass shooting. "? 51 is to provide a peaceful
flat-plate-type squad car with frequency characteristics by revising one letter. Conventionally, the
diaphragm for the speaker is generally frusto-conical No. 4 -1 "gutter" rlllll. 21111111 The socalled cone-shaped diaphragm formed in the shape of ,,,,,, is used widely, but such a diaphragm is
made 1111 111 ... by the concave surface of the diaphragm. , Has the defect that the frequency
characteristics are disturbed. 11111111 A flat diaphragm is used to solve this defect. 11111111
,,,,,,,,,,,,,,,,,,,, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ??However, the present condition is that
11111111 has not been obtained enough results. 11111111
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Diaphragm, diaphragm with foam resin etc.
formed in a flat plate shape, foam in recess of 1111 1 1 111 111 cone type diaphragm Material
is filled and radiation surface ..... is made into a plane, and the diaphragm etc. is 11111111 In
such a diaphragm according to the conventional invention, 11111111 ... 1 ... 1 It is impossible to
solve the contradictory phenomenon of "" "" if the weight should not be increased in order to
increase the E / # (? ? ? ? ? 11111111 as a measure of the mechanical characteristics of
the diaphragm. ...... It was not possible to increase 11111111 ? 111111113 by increasing the
air 7, the rate, and the # modification. There is an invention by the applicant shown in FIG. 1 as a
structure 5 for solving the conventional disadvantages. In this structure, a coil bobbin 2 is fixed
to a central portion of a flat plate diaphragm 1 provided with concentric irregularities, and a
reinforcing rib 3 fixed to the rear surface of the diaphragm l and a coil bobbin 2 are integrally
fixed. It is a flat type speaker which it has. According to the above configuration, the rigidity of
the vibrating plate 1 in the vibration direction is extremely increased by the concentric
unevenness and the reinforcing rib 3, and the vibration of the voice coil 4 is uniformly
transmitted to the whole vibrating plate 1 by the reinforcing rib 3. The low and mid frequency
characteristics are greatly improved.
However, it has been found that high frequency resonance occurs due to the increase in rigidity
of the diaphragm, and the high frequency characteristic is disturbed. Therefore, this invention is
configured to transmit the vibration of the coil bobbin to its peripheral portion except the center
of the diaphragm through the reinforcing rib, and suppress the high-frequency resonance by
utilizing the slight compliance of the reinforcing rib. The embodiment shown in FIG. 2 which is a
flat type speaker will be described in detail below. In FIG. 2 and FIG. 3, reference numeral 21
denotes a diaphragm comprising a flat plate-shaped peripheral diaphragm 21a provided with
concentric irregularities and a central diaphragm 21b having a dome shape, and the diameter of
the central diaphragm 21b is A value larger than the diameter of the coil bobbin 2 on which the
voice coil 4 serving as the drive source is wound and smaller than the diameter IA of the image
pickup moving plate 21 is selected. 3 is a reinforcing rib combined in a well girder shape, and a
voice coil in which an upper end edge of the reinforcing rib 3 is inscribed in contact with a
peripheral imaging plate 21a of the swing plate 21 and a reinforcing rib of the well girder shape
The reinforcing rib 3 attached at the contact portion 2 and the contact portion is preferably
made of a lightweight, highly rigid material such as aluminum alloy, synthetic resin such as
Bakelite, kraft paper, or the like, in order to reduce weight. The holes 3a may be formed so as not
to lose the rigidity, and the reinforcing rib 8 does not necessarily have to be in the form of a
parallel cross, and may have various other configurations. The central imaging plate 21b needs
to have a rigidity higher than that of the peripheral diaphragm 21a, and as shown in the
embodiment, one using shape rigidity such as a dome shape, or another material having higher
rigidity is used. The form of etc. can be taken. According to the above configuration, the weight
of the diaphragm 21 is increased at a rate at which the mechanical strength is significantly
increased by the concavities and convexities formed concentrically on the same-side diaphragm
21a and the reinforcement II 8 fixed to the lower surface of the peripheral diaphragm 21a. The
increase can be kept very low and consequently the apparent E / ? can be made very large.
Therefore, the frequency range in which the diaphragm performs uniform vibration, that is,
piston movement is expanded. Also, in the mid-range, in general, it is easy to cause reverse
resonance in which the peripheral diaphragm 21m receiving the driving force and the central
diaphragm 21b not receiving the driving force vibrate in the opposite phase to each other. Since
the rigidity 21b is higher than that of the peripheral diaphragm 21a, generation of dips in the
mid-range can be suppressed because << reverse 6 resonance occurs. Furthermore, in the high
region, the transmission of the imaging energy is suppressed by the slight compliance at the root
of the reinforcing rib 3 with the coil bobbin 2 so that the generation of the peak due to the high
region conumber can be suppressed. The characteristics of the flat panel speaker shown in the
figure and the flat panel speaker of this invention shown in FIG. 2 are compared.
(The both speakers have a common aperture 801 to 11 and the diameter of the dome portion is
9 sub. As is clear from the custom-made diagram, it is clear that this invention suppresses the
occurrence of peak dips in the high-pitched range and becomes flatter than the frequency
characteristics and f), and it is A to prove the effect of this invention. As described above,
according to the present invention, a coiled bobbin is provided with a diaphragm including a
peripheral diaphragm provided with concentric irregularities and a central diaphragm having a
greater rigidity than the peripheral diaphragm and a reinforcing rib fixed to the peripheral
diaphragm. Bonding? Thus, it is possible to effectively suppress high-frequency resonance by
utilizing energy loss at the time of high-pitched sound reproduction due to slight compliance of
the reinforcing rib, thereby providing a flat type speaker having extremely excellent frequency
characteristics. It is something that can be done.
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