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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to a speaker capable of
enhancing the reproduction efficiency at high tones and at the same time enhancing the
reproduction efficiency at low tones. In general, in an electromagnetic speaker, the gap width of
the magnetic gap is reduced to increase the magnetic flux density B in order to increase the
reproduction efficiency in the high range, but in this case, the lowest resonance which is the low
range In the vicinity of the frequency, the electromagnetic braking term (present) 2 represented
by the square of the product of the magnetic flux density B and the voice coil length l becomes
dominant, and the higher the magnetic flux density B, the lower the reproduction efficiency with
bass There is a problem of The present invention provides an EndPage: 1 VL, L speaker to solve
such conventional problems. Hereinafter, an embodiment of the present invention will be
described with reference to the drawings. In the figure, 1 is a first plate having a center pole 1a
at the center and an annular wall 117 at the periphery, 2 is a magnet disposed between the
center pole 1a and the annular wall 1b, 3 is an upper surface of the magnet 2 A second plate
arranged, 4 is a first voice coil bobbin inserted in a first magnetic gap formed between the center
pole 1a and the second plate 3, 5 is a first wound there Voice coil, 6 is a second voice coil bobbin
inserted in a second magnetic cap formed between the second plate 3 and the annular wall 1b, 7
is a second voice coil wound there, A frame 8 is provided on the upper surface of the annular
wall 1b, and a frame 9 is provided via an adapter or the like. A diaphragm coupled to the second
voice coil bobbins 4 and 6, 10 is a dust cap, and 11 is a damper. The gap width of the above two
magnetic gaps enlarges the gap width of one and makes the magnetic flux density B in the gap
lower than that of the other magnetic gap, whereby the vibration system with the lower magnetic
flux density B is obtained. Is designed to be lower than the lowest resonance frequency of the
vibration system. 2 shows a drive circuit of the speaker of FIG. 1, 12 is an audio signal source, 13
is a power amplifier, 14 and 15 [low pass filter and bypass filter, 5 and 7 are voice coil tees
shown in FIG. is there. In this way, the audio signal is split into high and low frequencies. The
divided signal is applied to each voice coil 5, 7, and the voice coil bobbins 4, 6 wound with those
voice coils 5, 7 drive the diaphragm 9, so that the gap width is smaller. Since the vibration
system has a high magnetic flux density, the reproduction surface ratio at high sound can be
sufficiently high, and the vibration system having the larger gap width has a low magnetic flux
density, so the reproduction efficiency at low frequencies can be sufficiently high.
It should be noted that which of the first portion (portion inside the second voice coil 6) 9a and
the second portion (portion outside the second voice coil 6) 9b of the diaphragm 9 is used for
bass Although it differs depending on the purpose of use, it is generally advantageous to use the
second portion 9b having a large vibration area and a large bank cavity of the diaphragm for
bass. Conversely, when the first portion 9a is used for bass, the first part 1a. It is necessary to
take measures such as making holes in the second voice coil bobbins 4 and 6 to suppress an
increase in the lowest resonance frequency due to the pack cavity becoming smaller. When the
second portion 9b is used for high-pitched sound, the diameter of the second voice coil bobbin 6
and the position of the center of gravity of the second portion 9b are made to coincide with each
other. When the so-called node drive is performed by being coupled to a part, an excellent effect
of being able to increase the treble reproduction limit frequency is obtained. In a flat diaphragm
such as a honeycomb diaphragm, it is necessary to make the diaphragm heavy because the
rigidity of the diaphragm is large, and to make the magnet larger in order to increase the
efficiency of the high sound which is a mass control area, As a result, there is a problem that the
electromagnetic braking term becomes large and the reproduction efficiency of the bass becomes
worse. However, when the present invention is used for such a plane diaphragm, the abovementioned problems can be solved at once. As described above, according to the present
invention, it is possible to enhance the bass reproduction efficiency without sacrificing the
reproduction efficiency at high tones.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of an embodiment of the
present invention, and FIG. 2 is a circuit diagram showing its drive circuit. 1 ... bridles ... the first
play), 1a и fist ... War Center ball, 1b ии 0 ии annular wall, 2 ... fist ... magnet, 30 ... second plate , 4eII
@ и fist и 1st voice coil bobbin 5 @ @ @ @ @ @ 1st voice coil, (3 * ** eee 2nd voice coil bobbin, 7
assess 2nd voice coil, 8 и и и и и и и Frame 9 и и и l diaphragm, 1Q Q @ ... fist dust cap. Name of Agent
Attorney Nakao and 1 other EndPage: ?
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