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JPS5055045

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DESCRIPTION JPS5055045
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 show a conventional condenser sca- ker,
and FIG. 1 is a schematic principle diagram of an example thereof, FIG. The figure is a schematic
cross-sectional view taken along a line 1-2 in FIG. 2 to show the vibration component, FIG. 4 is a
curve diagram showing frequency characteristics, FIG. 5 is a plan view of the guageum portion in
another example, FIG. FIG. 5 is a vertical cross-sectional view taken along the line 1--2 in FIG. 5,
schematically showing the vibration component, and FIG. 7 is a curve showing frequency
characteristics. 8 to 10 show an embodiment in which the present invention is applied to a
capacitor speaker, and FIG. 8 is a plan view of a diaphragm portion, and FIG. 9 is a state in which
a holding frame and diaphragm are separated. FIG. 10 is a perspective view, and FIG. 10 is a
longitudinal sectional view taken along line X-X in FIG. In the reference numerals used in the
drawings, 1 is a condenser scyker, 3 is a fixed pole, 4 is a fixed pole, 22 is a guar 7 mm, 22 a is a
vibrating portion, and 25 is a holding frame. Fig. 2-113-Japanese Utility Model Application
Publication No. 50-55045 (2) Fig. 2 Fig. 2, 97, each one having a size of 4 mm. ff 2 1 1 liquid
(Hz) + a Fig. 5 Fig. 8 Fig. 6 Fig. 6 Fig. 5 thousand: silk) 2) n---------12 '22 J 1-2! -114-Japanese
Utility Model Application Publication No. 50-55045 (3) also in FIG. fy 21-T @ dark & (} IJE) Fig.
9-115-
DETAILED DESCRIPTION OF THE INVENTION In the present invention, diamond 7 is held at its
peripheral edge by a holding member. The present invention relates to an electrostatic
electroacoustic transducing device provided with a microphone and a fixed pole disposed
opposite to the diaphragm, which is most suitable for application to a speaker, a condenser
microphone, etc. To provide an electrostatic electroacoustic transducer. As a conventional
electrostatic electroacoustic transducer, for example, as shown in the principle diagram of FIG.
The condenser speaker has a thin circular diaphragm made of synthetic resin, and circular metal
fixed electrodes 131 + 41 arranged close to each other on both sides of the diaphragm and
facing each other. The peripheral portion of the diamond slam (2) is fixed and held by a ring-
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shaped metal holding frame (6) K. Further, a large number of through holes tel + 71 are provided
in the fixed pole 131 + 41 in the vibration direction of the diaphragm [11]. A bias power supply
(9) is connected to the memory holding frame (11) via a resistor (8), and the bias power supply is
connected to a coil (1) connected between the fixed electrodes 131141. A coil 0 @ connected
with an AC input source (11) is disposed to face the coil 2. When the capacitor speaker + l +
operates, charge is accumulated in the electrostatic capacitance formed between the diaphragm
(the terminal and the fixed pole t 31 + 41) by the lf bias power supply (9), and thus the AC input
source (u) When a given electric input is given from the above, an attractive force is generated
between the AC electric field formed by this input and the above-mentioned electric charge, and
the diaphragm (the vibrator vibrates, resulting in generation of a sound wave (2) The through
holes +61 + 71 are pushed between the diaphragm (2+ and the fixed pole i 31 141 by the
vibration of the diaphragm (+ and the fixed pole i 31 141 to release the air and perform the
braking action). However, in this capacitor speaker fi +, even if the force applied to the
diaphragm (2) K is uniform in place, uniform piston oscillation is performed, but in fact the
divided oscillation always occurs because the force is not uniform. This condition is shown in
FIGS. 2 and 3. That is, since the diaphragm (2) is circular and point symmetric with respect to its
center point, standing waves of the same frequency are generated in all directions passing
through the center point, and strong divided vibration occurs. That is, this central point acts as a
movement center, and the traveling direction of the oscillating wave passing through the central
point is opposite to the traveling direction of the reflected wave around the diaphragm (2).
Then, the actual vibration line @ loss theory and the piston vibration come to overlap and occur.
In this case, as shown in FIG. 4, the phase of the split shooting motion and the phase of the piston
vibration are opposite to each other at the shooting frequency lower than the resonance
frequency f0 of the split shooting motion, so the split vibration component a and the piston
vibration component (3) b overlaps the output sound pressure level of the sound wave. This
phenomenon occurs in the inner part of the node of the divided vibration component 1, in other
words, in the bass region. At the frequency where the divided imaging dynamic component a and
the piston vibration component are opposite in phase and their absolute values are equal to each
other lAK, both components cancel each other17, so the output sound pressure level drops
sharply and changes Sharp valleys a → appear on the curve. When the frequency coincides with
the resonance frequency, the amplitude of the divided vibration becomes very large, so a sharp
peak (II occurs in the change curve of the output sound pressure level). Furthermore, if the
vibration frequency is a dog from the resonance frequency of Ki 9 divided shooting movement in
two, the divided vibration component a and the piston shooting moving component are in the
same phase with each other, so both components do not cancel each other Therefore, smooth
frequency characteristics can be obtained. However, in fact, as shown in the frequency
characteristic tljll14, peaks and valleys become continuous as shown in the frequency
characteristic tljll14, which causes the sound quality of the speaker to be significantly
deteriorated. There is also known the above-mentioned diaphragm (in addition to the rectangular
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diaphragm (2) shown in FIG. 5 (4) (the rectangular holding rod + il holds it. In this case, the
diaphragm (the opposing sides of the diaphragm are parallel to each other (a standing wave of
the same frequency is generated in the direction perpendicular to the opposing sides, and the
divided vibration shown in FIG. 6 occurs). Thus, considering the divided vibration component
amount and the piston vibration component, peaks and valleys are sequentially generated in the
output sound pressure level as shown in FIG. The present invention has been devised to correct
the above-mentioned defects, and relates to an electrostatic electroacoustic transducer in which
the vibrating portion of the diaphragm has an asymmetric shape (for example, an irregular
quadrilateral). It is. By this configuration, it is possible to stop the divided vibration t- + i and
make it possible to make the frequency characteristic of the vibration extremely favorable. The
above-mentioned "asymmetric shape" refers to one that is not a shape such as point symmetry or
line symmetry. Next, a 7t embodiment of the present invention applied to a condenser speaker
will be described with reference to FIGS. 8 to 10. FIG. The capacitor speaker in this embodiment
is the same as the conventional loudspeaker shown in FIG. 1 except for the diaphragm and this
holding frame.
As shown in FIGS. 8 and # I9, the diaphragm is fixedly held by two irregularly shaped rectangular
openings @ upper and lower two rectangular holding frames. The diaphragm ah is made of, for
example, a rectangular film of 6 to 10 .mu.m thick and made of, for example, gold deposited on
its surface. The tft holding frame @ is formed in a rectangular shape of the same size as the
diaphragm weir, and the opening portion @ 1 has two pairs of opposite sides (20 m) (20 b) (20 b)
which are not parallel to each other and have mutually equal base angles θ (20c) and (20d)
respectively. Therefore, in a state where the diaphragm weir is fixedly held between the holding
frame and the holding frame, a vibrating part (22 weir) of the diaphragm is formed in the open
case. The vibrating portion (22a) has the same shape as the opening @ phantom, and the
opposite sides (20aJ (20b) (20c) (20d) are not parallel and have different lengths. Thus, even if
vibration occurs in the direction of the side (20c) (20d) (6) as shown by an imaginary line in FIG.
Are respectively reflected in the direction of the arrow (ha) (good) by the arrow 20d). Therefore,
the two waves do not overlap with each other because they do not reverse the reflected wave. As
a result, when the diaphragm (2) vibrates, the generation of a standing wave is prevented as the
vibration center is not formed, and the divided vibration is completely eliminated. Since the t
phenomenon is the same even if vibration waves in any directions occur other than the abovementioned phenomenon, only the piston imaging component contributes to the vibration as
shown in FIG. Therefore, since the generation of sound pressure levels and the generation of
valleys do not occur from the division mm K, and a smoothly changing frequency characteristic is
obtained, the sound quality of the speaker can be made excellent t. Although the present
invention has been described based on one embodiment, j! Based on the technical idea of the
present invention. ! It will be appreciated that variations are possible. For example, the shape of
the vibrating part (22 m) of the diaphragm rod is a polygon other than a quadrilateral, and more
generally, an asymmetric shape in which the opposite sides are not point symmetric or line pair
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(7) It is possible to Also, only one holding frame (c) can be used. Of course, the present invention
can also be applied to a condenser microphone. In this case, since the size of the condenser
microphone is equal to or smaller than that of the conventional microphone, the division loss aiz
is generated in the conventional high-pitched sound, and the present invention can prevent
generation of sound peculiar to the microphone due to this divisional photographing. It becomes
possible to get things.
Furthermore, of course, the present invention can be applied to condensers and dophones. In this
case, the above-described effects can be obtained regardless of electret type or bias type.
According to the present invention, as described above (the imaging moving portion of the
diaphragm has an asymmetric shape, it is possible to prevent the occurrence of standing waves
and eliminate the occurrence of divided imaging, It is possible to have very good frequency
characteristics.
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