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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a recently developed
electro-acoustic transducer, FIG. 2 is a cross-sectional view of an essential part showing the
inconvenient state of the transducer, and FIG. 4 is a cross-sectional view showing an embodiment
of the electroacoustic transducer of the present invention, and FIG. 5 is an enlarged crosssectional view of the main portion. 16 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · • 25 ...... driver unit, 26 ...... delay case, 28 ...... first
diaphragm, 29 ...... sound output tube, 30 ..... Delay signal pressure case 31, second diaphragm
32, vibration transmission delay element 34, pore, 35 damping material.
The present invention transmits vibration generated by a driver unit to a delay vibration unit via
a vibration transmission delay element so as to radiate delay vibration as sound. It is an object of
the present invention to improve the acoustic transfer characteristic of the electroacoustic
transducer. Recently, an electro-acoustic transducer has been developed which generates a
delayed sound by utilizing a delayed vibration as shown in FIG. 1. That is, the inside of a
cylindrical driver case 2 having an inner ring 1 at an intermediate portion A driver unit formed of
a magnetic circuit 5 formed by the yoke 3 and the magnet 4 and a dome-shaped diaphragm 8
having a voice coil 7 engaged with the magnetic gap 6 of the magnetic circuit 6 is incorporated
under the crucible 1 The delay case 9 having a small hole in the middle open at both ends is
connected to the upper part of the inner case 1, and the opening on the inner case 1 side of the
delay case 9 is a flat plate through the ring-shaped spasser 0. 1) The first diaphragm 11 is
attached so as to close the opening, and the other opening of the delay case 9 is provided with an
acoustic output pipe 12 which protrudes in the form of a camp and protrudes outward at the
center or center) 73 signal pressure Case 13 is incorporated, and this delay signal is The inner
end of the pressure casing 13 second diaphragm 14 flat-shaped is mounted et 扛 to block the
delayed signal pressure casing 13. The end of a coil spring 16 as a vibration transmission delay
element is coupled to the center of the first peristaltic plate 11 and the second diaphragm 14. In
such a configuration, when the dome-shaped diaphragm 8 of the driver unit vibrates due to an
input signal to the voice coil 7, the vibration is generated through the amount of sound response
of the enclosed space between the dome-shaped diaphragm 8 and the first diaphragm 11. Is
transmitted to the first diaphragm 11, and the vibration of the first diaphragm 11 is delayed
through the coil spring 16 and transmitted to the second diaphragm 14, and the vibration of the
second diaphragm 14 causes a delay signal pressure case. The sound pressure of the delay signal
is generated in 13 and emitted to the outside from the sound output tube 12. The space between
the dome-shaped diaphragm 8 and the first diaphragm 11 in such a nausea-acoustic vari- ousclimbing device is the transmission of vibration-efficiency)) "fM *" "" sealing 11 喝 is used. When
the static pressure of the enclosed space is increased as shown in FIG. 2, the dome-shaped
diaphragm 8 can not be controlled under the influence of the environment 0 temperature and 4
degrees change, as shown in FIG. Was pushed upwards, and said that it would cause a marked
deterioration of the sound transmission characteristics. From such a thing, as shown in FIG. 3,
although the thing which provides the through hole 16 in the driver case 2 and adjusts static
pressure was also developed, the acoustic transmission characteristic is remarkably deteriorated
by the size of this through hole 16 It is necessary to tighten the accuracy of the through hole 16
because of the disadvantage of
The present invention eliminates the above-mentioned conventional drawbacks. An embodiment
of the present invention will be described below with reference to FIGS. 4 to 6. A cylindrical
driver case 16 has an inner shell 17 formed in the middle portion. Under the inner shell 17 of the
driver case 16, a space circuit is formed on a magnetic circuit 2o constituted by a yoke 18 and a
columnar magnet 19. A driver unit 25 having a dome-shaped pregnancy moving plate 24 in
which a voice coil 23 engaged with a magnetic gear \ F) 6 □ sleeve 22 of the magnetic circuit 2o
is connected via a guide 21 is accommodated. A lower end portion of a cylindrical delay case 26
having an opening at the upper and lower surfaces is fitted on the inner rim 17 of the driver case
16. A flat plate-shaped first diaphragm 28 is incorporated in the lower end opening of the delay
case 26 via a ring-shaped spacer 27 so as to close the lower end opening, and the upper end
opening has a camp-like outer shape in the center A delay signal lower casing 30 having an
acoustic output pipe 29 projecting to the bottom is coupled, and a flat plate-like second
diaphragm 31 is closed at the inner opening of the delay signal casing 30 so as to close the inner
opening of the delay signal casing. Embedded in In the space formed between the first diaphragm
28 and the second diaphragm 31 in the delay case 26, a through hole 32 communicating with
the outside air is provided in the delay case 26. Further, a coil spring 33 beno 6 as a vibration
transmission delay element is stretched between the first diaphragm 28 and the second
diaphragm 31. Further, in a space portion serving as an acoustic capacity formed between the
dome-shaped diaphragm 24 of the driver unit 26 and the first diaphragm 28, a pore 34
communicating with the external space is provided. The pore 34 is provided in the inner ridge 17
of the driver case 16 and the time constant by the acoustic capacity of this space and the
acoustic resistance formed by the pore 34 is set to the driver unit 26 or the first. A damping
material 35 is attached to the outer space side of the pore 34 so as to be larger than the period
of the low frequency end of the transmission frequency band of the delay conversion system by
the second diaphragm 28.31 or the like. A felt or the like is used as the damping member 36, and
the time constant can be easily set below the transmission band by controlling the ventilation of
the damping member 36. As another practical example, a sintered metal crucible is pressed into
the pores 34 to control the air permeability in the evening, and the pores 34 are long in the form
of a bridge between the driver case 16 and the delay case 26 '. By configuring, the acoustic (7)
resistance can be selected to an arbitrary value, and the time constant can be set below the
transmission band.
As described above, the electro-acoustic transducer according to the present invention has a pore
in the space between the diaphragm of the driver unit and the diaphragm of the delay conversion
system, and the acoustic capacitance of the space and the acoustic resistance of the pore Since
the constant is made larger than the period of the low frequency end of the transmission
frequency band of the driver unit and the conversion system for delay, it is possible to provide
ventilation and keep the static pressure in space constant by the ambient temperature change to
deform the diaphragm. As well as being able to prevent the phenomenon and stabilize the
acoustic transfer characteristics, it is not required to have high precision processing as the
processing accuracy of the pores, and has advantages such as excellent processability and
advantageous in cost, It is of great practical value.