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JPS5728585

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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 JPS5728585
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional front view of a conventional
closed type speaker, FIG. 2 is a half sectional front view of another conventional speaker, and
FIG. 3 is an embodiment of the speaker of the present invention. FIG. 16 ...... magnetic circuit, 21
ииииии frame, 21a ...... bottom, 21b ...... inclined portion, 21c ...... horizontal portion, 21d и ....... Pore,
23 ииииии Vibration plate, 24 иииииии Voice coil, 25 иии иии Dampeni, 26 ииииии Magnetic gap 1.27 иии Dust Cap,
28 ... Baffle plate.
[Detailed description of the invention] 7 No. This invention relates to a closed type speaker
having no window hole in the frame, and by improving the frame, the cavity is enlarged to
improve the low-pass characteristic by a total of 6 ░ At 640 ffif ' As a conventional closed type
speaker, as shown in FIG. 1, a plate 2 provided with a center pole 1, a ring-shaped magnet 3, and
a window (a magnetic circuit 5 formed by a ring-shaped upper plate 4) A frame 6 having no
holes is connected, a peripheral portion of a conical diaphragm 8 is fixed to the peripheral
portion of the frame 60 together with a gasket, and a voice coil 1o is connected to a central
portion of the diaphragm 8 The middle part of the coil 10 is held by the damper 11 and the
seven parts of the voice coil 10 are fitted into the magnetic gap 12 of the magnetic circuit 5
without eccentricity, A non-air-permeable dust cap 13 is attached to the central upper surface of
the diaphragm 8. Since the volume between the back surface of the diaphragm 8 and the frame 6
is small in such a closed type speaker, the air stiffness at this volume is thick (the lowest
resonance frequency fo of the slip force is There is a drawback that high (and, in the frequency
dispersive p-type, large rise (Q becomes thick) occurs in the low band. In order to eliminate such
a defect, the frame 6 is provided with the window hole 14 as shown in FIG. 2 and the sealing case
15 is entirely covered to form a cavity on the back of the diaphragm 8 as shown in FIG. In order
to reduce the stiffness of the speaker and to lower the lowest resonance frequency ifo as a
speaker, those have been developed. Although the intended effect is obtained also in this
configuration, since the sealed case 15 is separately used, it takes time and effort to assemble
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1
and is extremely disadvantageous in cost. The present invention eliminates the above-mentioned
conventional defects, and by making improvements to the frame, the cavity on the back of the
diaphragm is made thicker when incorporated into the baffle plate (to improve the low frequency
characteristics). It is something to try. Hereinafter, an embodiment of the speaker of the present
invention will be described with reference to FIG. A magnetic circuit 16 is constituted by a plate
18 having a center pole 17, a ring-shaped magnet 19, and a ring-shaped upper portion 1 v 7 ░ '20. A frame 21 made of metal and having no window hole is joined to the frame 16 by welding
or the like. The frame 21 is provided with a bottom 21a to be coupled to the magnetic circuit 16,
a slope 21b extending obliquely upward from the peripheral edge of the bottom 21a, and a
horizontal 21c continuously on the upper end of the slope 21b. An inclined portion 21d which is
extended again from the periphery of the horizontal portion 21c, a stepped upper end horizontal
portion 21e connecting the peripheral portion of the diaphragm to the upper end of the inclined
portion 21d, and the upper end horizontal portion 21e It is configured to have a lower inclined
portion 211 which is extended downward to the outer periphery, and a terminal horizontal
portion 21g having the same height as the horizontal portion 21c at the lower end of the lower
inclined portion 21f. A pore 22 is provided, and a peripheral portion of a conical diaphragm 230
is bonded to the upper end horizontal portion 21e of the frame 21 by bonding or the like, and a
voice coil 24 is formed at the central portion of the diaphragm 23 Together are, in this voice coil
24, / ░ The inter is held by the damper 25, the lower portion of Boisukono one s-yl 24 is in fact
a (Hamarikon eccentrically to the magnetic Giyano 6-flop 26 of the magnetic circuit 16.
Further, on the upper surface of the central portion of the diaphragm 23, a non-air permeable
dust cap 27 is attached. With such a configuration, when the horizontal portion 21c and the end
horizontal portion 21q of the frame 21 are brought into contact with the baffle plate 28 shown
by a broken line and the input signal is applied to the voice coil 24, the voice coil 24 is in the
magnetic gap 26. It vibrates up and down, its shooting motion is transmitted to the diaphragm
23, and a sound is emitted from the diaphragm 23. When the diaphragm 23 vibrates, air between
the diaphragm 23 and the frame 21 passes through the vent holes 22 of the inclined portion 21
d of the frame 21 and enters and exits the space 2 V 9 formed between the baffle plate 28 and
the frame 21. Then, the stiffness of the air in the space on the back surface of the diaphragm 23
becomes small, so that the lowest co-imaging frequency fo as a speaker can be made low. As
described above, since the speaker of the present invention is configured, vibration can be
obtained only by devising the peripheral portion of the frame, and the cavity on the back of the 3
or 1 plate can be made thick (2 ? ? sound pressure frequency characteristic It has the
advantage of being able to eliminate the rise in the low frequency range and reducing the low
resonance frequency as much as 6-, which is advantageous in terms of cost and becomes a dog of
practical value.
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