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JPS56132094

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DESCRIPTION JPS56132094
Description 1, title of the invention
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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, an electromagnetic braking term represented by the
square of the product of the magnetic flux density B and the voice coil length 2 (B phantom 2
becomes dominant, and the higher the magnetic flux density B, the lower the reproduction
efficiency with bass becomes There is a problem of The present invention provides a speaker
which solves 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
ball 1a at the center and an annular wall 1b 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
disposed, 4 is a first voice coil bobbin inserted in a first magnetic gap formed between the center
ball 1a and the second plate 30, 5 is a first wound there Boy EndPage: 1 coil, 6 is a second voice
coil bobbin inserted in a second magnetic gap formed between the second grate 3 and the
annular wall 1b, 7 is a second voice wound there A coil 8 is a main frame provided on the upper
surface of the annular wall 1b, a sub frame 9 is provided on the upper surface of the second
plate 3 and an inner periphery is coupled to the upper end of the first voice coil 4 The first
moving plate 12 whose outer periphery is attached to the sub-frame 9 via the edge 11 is
connected to the upper end of the second voice coil bobbin 6 at its inner periphery and is near
01-05-2019
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the inner periphery via the edge 13 The second diaphragm 9 is attached to 9 and the outer
periphery is attached to the main frame 8 through an edge 14, 15 is a dust gap, and 16.17 is a
damper. The gap widths of the two magnetic gaps increase the width of one of the gaps to make
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 The lowest resonance frequency is
designed to be lower than the lowest resonance frequency of the other vibration system. In this
way, since the electromagnetic damping term (liver) 2 of the vibration system with the larger gap
width is smaller, it is possible to use the low-pitched sound without sacrificing the high sound
reproduction efficiency of the vibration system with the smaller gap width. Although it is possible
to improve the reproduction efficiency 4, and in FIG. 1, sub-frame 9 is used, as shown in FIG.
The second diaphragm 10.12 may be coupled by an edge 18. In any case, the first one. The
second voice coil 6.7 may be connected in parallel to the output end of the power amplifier 19 in
FIG. 3 to apply the signal from the audio signal source 20. 1st. Although which of the second
diaphragms 10.12 is used for low-pitched sounds depends on the purpose of use, generally the
second diaphragm 12 which has a large vibration area and can take a large pack cavity of the
diaphragm is used. It is a good idea to use it for bass. Conversely, the first vibration 8! When
using 10 for the low tone, the first one. 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. 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, FIG. 2 is a conceptual diagram showing the main part of another embodiment
of the present invention, and FIG. It is a circuit diagram showing a circuit. 1 ...... first of the Great,
1a ии 011II center pole, 11) 111111 @ 11 + 1 annular wall, 2 * e ++ ee * 'v Gunetsuto, 3 ... dispute
- 0 second plate, 41 ... First voice coil bobbin 6 First voice coil 6. Second voice coil bobbin 7
second voice coil 8. 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 2 diaphragms, 15e ииииииииииииииииииииииииииииииииииииииии Damper. Name of
agent Attorney Nakao Toshio and others 1 person Figure 1 Figure 4 Figure 2! ? Figure 3
EndPage: ?
01-05-2019
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