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DESCRIPTION JPS5798099

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DESCRIPTION JPS5798099
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 are longitudinal sectional views of a
piezoelectric speaker, and FIG. 1 shows a prior art vibrator using a cantilever cantilever structure.
FIG. 3 is a longitudinal cross-sectional view in the case of using the vibrator according to the
present invention, in the case of using the vibrator of the peripheral fixed configuration. FIG. 4 is
a longitudinal sectional view of a speaker showing the vibration mode of the vibrator, and FIG. 4A
is a case of a conventional vibrator, and the same figure is a case of the vibrator of this invention.
FIG. 5 is a longitudinal sectional view of a piezoelectric speaker having another structure
according to the present invention. FIGS. 6 to 9 are charts showing frequency characteristics in
the embodiment, and FIG. 6 is a case of a conventional cantilever structure vibrator, and FIG. 7 is
a case of a conventional peripheral fixed structure vibrator FIG. 8 shows the case of the vibrator
according to the present invention, and FIG. 9 shows the case of using the vibrator according to
the present invention in a two-stage manner. In the figure, 11 ... piezoelectric vibrator, 12 ...
metal plate, 13 ... piezoelectric plate, 14 ... speaker case, 15 ... fixed stand, 16 ... elastic support,
17 ...・ Vibration board.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a piezoelectric speaker by using a piezoelectric vibrator having a cantilever structure, and it is
possible to determine the supporting shape of the vibrator to reduce the reproduction ability and
the circumference of the low region. The present invention relates to a piezoelectric speaker
improved in the fl-number characteristic χ (first page) 1 () 〆 t 2 hollow 3. Piezoelectric
vibrators for use in piezoelectric speakers are well known as those having a strip-shaped
cantilever structure and those having a disk-shaped or strip-shaped peripheral fixing
configuration. The ability is poor, for example, a speaker that reproduces 5 voices-C is unsuitable,
and it has not been put to practical use. The piezoelectric speaker of the cantilever configuration
is, as shown in FIG. -1! XI: The pressure at which the electric plate is joined is attached to the
fixing base (4) projecting from the inner bottom portion circumferential surface of the circular
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speaker case 10-s (3) at one end of the vibrator il + A piezoelectric vibrator with a cantilever
structure in which the center point of a cone-shaped diaphragm (5) whose peripheral end is fixed
to the opening of the speaker case is combined with the above-mentioned vibrating portion.
Inherently, when the amplitude is large, it is 15 and the lowest joint frequency is medical, and the
reproduction efficiency is low and the frequency characteristic in the low region is bad. Next, a
piezoelectric speaker of a strip-shaped peripheral fixed configuration (see FIG. 2, a piezoelectric
vibrator similar to the above (21 as shown in FIG. 21't 40 tti 」" fixed both ends to the fixed base
(4a) protruding from two places 【Configure the speaker (1) center point of the diaphragm (5)
with the center point of the perturbator (2) to make a speaker It is In the case of this
configuration, the reproduction efficiency is higher than that of the former, but the imaging noise
can not be taken large and the output in the high range is high but the output in the low 5 range
is completely lacking, It is not suitable for reproduction. As described above, in the conventional
piezoelectric vibrator, only a speaker having poor reproduction ability in the low band was
obtained. Therefore, this invention improves the reproduction ability in the low frequency range,
and provides a piezoelectric speaker that exhibits excellent frequency characteristics over a
practical IO range width. That is, this invention has a piezoelectric vibration with a cantilever
structure. An elastic support is provided between the fixed part of the element and the pickup
end, or an appropriate weight is attached to suppress deflection of the vibrator at the time of
vibration 15 and use this as a drive source. Type speaker. The specific structure of the
piezoelectric speaker according to the invention will be described based on FIG. 3. The pressure= vibrator α- に よ る according to the invention is, for example, a metal plate and a piezoelectric
plate J is an adhesive layer. (Page 3) 10 '/', compounded with 1Jl agent, the -10,000 end of which
is the fixed side, and the other end is the peristaltic destination 141 '.
Here, the center point of the cone-shaped actuating plate α force is coupled on the piezoelectric
plate u3 between the shooting tips, while being fixed to the fixed base convex provided on the
inside I of the speaker case I, The moving plate 0 is fixed to the opening of the case case Q4 and
an elastic support (d) is disposed between the fixed portion of the vibrator QU and the tip end of
the vibration, and the vibrator ul side and the speaker case side And are elastically coupled. By
configuring as described above, the piezoelectric speaker according to the present invention can
obtain an improved output in the low frequency region 10 and excellent frequency
characteristics in a wide band, and the reason why the effect according to the present invention
can be obtained will be described below. FIG. 4a, which will be described with reference to FIG. 4,
shows the width 15 of the type of engagement in the low range of the above-described
conventional image pickup actuator (1). That is, even if it is a peristaltic element (1) of a
cantilever configuration which can take a large brow and has a regenerative ability in the low
range, the central portion of the + h brake 11 in the imaging type toughness in the low range The
yarn movement plate transmits the vibration of the vibrator (1) to the side plate (5) in a ringing
motion because of the occurrence of deflection. The amplitude of the (fourth “t) 1 (J (l IJ-nony, j
(5)) is small, and the output is lowered, which causes a problem in the frequency characteristic in
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the low frequency region. However, as described above, the elastic support aS is disposed
between the fixed portion of the image pickup element an and the vibrating tip, and by elastically
supporting this portion, the 51 辰 reciprocator α is obtained in FIG. 4b. As shown in the imaging
mode of ° C., the deflection of the middle part of the vibrator in is reduced, and the vibration is
effectively transmitted to the follower plate II 'rl, so that the output in the low region is
remarkably the same. Therefore, as shown in the drawing, the elastic support (i) may be provided
on the inner bottom of the speaker case a− and may be provided on 10 other attachment
members. Furthermore, depending on the shape, size, and the like of multiple ridges of the
vibrator cage, the position to be supported and the size, shape, hardness, and the like of the
elastic support ae may be appropriately selected. In addition, the deflection of the abovementioned vibrator aυ can be suppressed in the low region by attaching an attachment of
appropriate weight to the position where the elastic support 150e is provided, so that the output
of the low region can be suppressed. 0 The above appropriate weight t '@ is the mounting
position, depending on the shape, size, etc. of the peristaltic element, where an improvement is
obtained and an effect equivalent to that of the elastic support aS is obtained. (Fifth Rule) 1 Jol "1
Size and weight are determined. Next, with regard to the arrangement and mounting position of
the elastic support and excessive heavy items on the vibrator, in the experiment by the present
inventors, it is most effective to provide the tl of the vibrator ridge length at the center position.
It was confirmed that it was high.
5 Furthermore, as shown in FIG. 5, if the cantilever U of the cantilever structure according to the
present invention is protected in multiple stages and the diaphragm αη is driven, the output in
the low region is the same as that of the Ti over a wide band In the case of one child, the output
is the same as above. That is, the first stage vibration 10 mover (] la) has the elastic support US
as the configuration according to the invention described above, and the elastic support (16a) is
the same as the first stage vibration tip. k, and to connect this town support (16a) to the
intermediate H3 of the second attacking element (llb), the second line is overlapped 15 times
above the first stage, The imaging moving plate α♂ is connected to the tip of the upper stage
(here, “9A2 stepped vibrator (11b)). In the above, although the explanation is made with respect
to a vibrator which is a strip and in which a piezoelectric plate is combined on one side only, the
metal plate and the piezoelectric plate may have various shapes on both sides of the metal plate.
It is apparent from the above description that even when the 10 ('r, 4) piezoelectric plate is
provided, the effects of the present invention are equivalent. Next, an embodiment according to
the invention will be shown to clarify its effect. Here, a piezoelectric speaker using the vibrator of
the conventional cantilever structure and the both-ends fixed structure described above, and a
piezoelectric speaker using the piezoelectric vibrator according to the present invention in one
step The frequency characteristics were measured for each of the 4 tiles. In order to facilitate
comparison, equivalent ones were used for each of the diaphragm, the speaker case, and the
piezoelectric vibrator. That is, a Mylar film having a thickness of 100 stripes and a diameter of
47 al was used as the diaphragm, and a speaker lS case having a diameter of 50 mm and capable
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of fixing the peripheral end of the diaphragm to the opening was used. The strip-shaped vibrator
has a length of 24 s + a. Width 14 m 11. A piezoelectric plate made of zircon and lead titanate
based piezoelectric ceramic with a length of 21 關 1 width 14R1 and a thickness of 0.15 fi is
bonded to a metal plate made of phosphor bronze with a thickness of 0.15 腑 and fixed when one
side is fixed. 3 m in length, and fixed at both ends? This (the 7th +, +) J () (] (-)-j. In the case of a
piezoelectric plate, the shield is centered around 0. A rubber of hardness 70 is used for the
elastic support used in the image pickup motor of this invention, the cross section is 2MM × 20
and the height is the height of the fixing base of the speaker case It was considered equivalent. In
the case of a two-stage photographing moving device, a circle of 1 yen was used as a support for
one person's vibrator, which is a yen-purchase-size rubber piece 1Z. In the measurement
condition of the screen frequency characteristics, an alternating voltage of effective value 1 was
applied to the four types of speakers described above, and the output of the on-axis 101 of the
diaphragm was measured.
As shown in the chart of FIG. 6, the measurement result shows that the lower limit of the
reproduction fee is about 500 Hz or 2 KHz as shown in the chart of FIG. And there is a problem
with the frequency characteristics in the low band. Also, in the case of the conventional
peripheral fixed-configuration fan, as shown in FIG. 7, the output in the low band can not be
output (in contrast to this, the vibration according to this invention is not conducted. In the case
of type speakers, the sound pressure level that is practically sufficient over a wide range of low
frequencies or Lairuki has been obtained as in the case of a type speaker in the case of a type
speaker. The number characteristic λ (f; 877tj06I) ′, ′ ′ is shown. Furthermore, in the case
of a speaker using a large number of vibrators according to this invention, as shown in FIG. 9, not
only the output improvement in the low band but also the output in the wide band is greatly
improved. It can be seen that it is suitable as a speaker ○ 1 “° 1 surface 0 simple 7 theory”
FIGS. 1 to 3 are longitudinal sectional views of a piezoelectric speaker, and FIG. 1 is a vibrator
having a conventional cantilever structure. 2 is used in the case of using the vibrator of the
conventional peripheral fixed configuration, and FIG. 3 is in the longitudinal section J when the
fitted lO motor according to the present invention is used. FIG. 4 is a longitudinal cross-sectional
view of a speaker showing the form of movement of a single-character actuator, and FIG. 4 is a
case of a conventional vibrator, and the same figure is a case of the vibrator of this invention.
FIG. 5 is a longitudinal sectional view of a piezoelectric speaker having another structure
according to the present invention. FIGS. 156 to 9 are charts showing frequency characteristics
in the embodiment, and FIG. 6 is a conventional cantilever. In the case of the i mover in the
configuration, FIG. 7 d in the case of the fM 111 in the peripheral fixed configuration in the prior
art, FIG. The case where two ItlI rivers (9 m) 1 () ()) f] is shown. 11: Piezoelectric vibrator 12 in
the figure. Metal plate 13 Piezoelectric plate 14 Speaker case 15 Fixing base 16 Elastic support
17 Diaphragm. Applicant Sumitomo Sumitomo Kinzoku Co., Ltd. (6) Coral Sound-Agent Press Co.,
Ltd. 1) □ −-· 1 (page 10) 1 tJ (ib Figure 1 Figure 4 す S Three Voices 1 + bl Figure 2 17 17 9(516 11 a 2 Fig. 5 Fig. 5 14 in Fig. 171 1417 + 6 α I 4 → 2 "14 ヲ ose 9 c +, each 10 (meaning
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偶 111-9 \ 9 i i m m 偶 couple column. 吠 4 吠 □ □ 一 1 1 1 1 1 P 19 PIIJ 龜 1 (
l痕痕痕一1
C 8 yen 円 龜 8i 9 Plr!
と謙・・ll
Chika prefecture ※ C C 4 ー) 1-J 6 creators other than applicants, utility model registration
applicants or agents 11] creator 1 side 6-6 Kofuru Otowa Co., Ltd. Osamu Araishi Egawa 2-chome
15-17 Sumitomo Special Gold 1! A. Yamazaki Co., Ltd. Akio Koyano (2) Utility model applicant
Applicant for Saitama Prefecture 1st-6th Shibashita 1st-6th Coral Acoustics Co., Ltd.
Representative Masahito Yoshimi 1 o), t no? ノ′ 72
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