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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of speakers, and more particularly to the improvement of speaker edges or spiders.
[Background Art] As an example of a conventional speaker, FIG. 7 shows a cross-sectional view of
a general cone-shaped speaker described on page 25 of "Shieker & Enclosure Encyclopedia"
Seibundo Kuramitsusha Akira, 54, August 54. . In the figure, (1) is a cone-shaped diaphragm, and
an edge (2) for holding the diaphragm (1) at a predetermined position is in contact with the outer
peripheral edge of the diaphragm (1). A diaphragm (a voice coil (3) for driving the diaphragm
(11) is in contact with the portion. A spider (4) for holding the vibrating thread at a
predetermined position is connected to an upper portion of the voice coil (3). (5) is a magnetic
circuit. (61はフレームである。 As described above (the end (2) or the spider (4) of the
speaker having a built-in speaker) is for attaching the diaphragm (11 or voice coil (3) in the
speaker unit to the frame (6)). The vibration 82 (11, etc. should not be restricted to the
movement of the motor etc., and it must be able to follow the movement in the vertical direction.
In order to fulfill these functions, the conventional edge (2) and spider (4) often use half arc
shape and wave shape, respectively, and their materials are for acoustic materials. The knitted
fabric was specially processed and formed into a shape. [Problems to be Solved by the Invention]
A conventional edge or spider using a fabric in this manner has a low stretch in material
structure and material quality, and has an anisotropy due to a banded direction, so it has a bass
range or large area During amplitude, non-shaped injection of force vs. displacement occurs,
causing the problem of increased distortion in acoustic custom-made. SUMMARY OF THE
INVENTION The present invention is directed to solving the above-mentioned problems, and an
object of the present invention is to obtain a speaker with good edge or spider straight edge
injection and low acoustic reflection. [Means for Solving the Problems] The speaker according to
the present invention has a pressure at which at least one of the edge and the spider has
electrodes attached to both sides! Make a thin film with a note, position this piezoelectric thin
film at the end of the edge or spider of the frame and a fixed part to the diaphragm or voice coil
so that it is located on different planes, and pressure An electric field whose direction is in phase
with the vibration direction of the diaphragm is applied to the electrode of the piezoelectric thin
film. [Operation] The edge or spider of the piezoelectric thin film in the present invention
expands and contracts in four phases corresponding to the vibration direction of the diaphragm
according to the input signal of the speaker, and functions to eliminate the displacement
limitation of the diaphragm.
invention will be described hereinbelow with reference to the drawings. FIG. 1 shows a crosssectional view of a speaker illustrating the present invention at the edge, and the reference
numerals are the above-mentioned conventional example and N-. Edge (21 is pressure of polymer
or composite-piezoelectric material 1! Note 5. A detailed sectional view is shown in FIG. In-, Ql is
a thin film of a piezoelectric material, and housing is an rtfcz pole provided on both sides of thin
film a. The material of the thin film (IQ is, for example, a polymer resin of PVDF (polyvinylidene
fluoride) or a composite of a powder of PZT (lead zirconate is lead) and a polymer resin. In
addition, the electrode is made by depositing aluminum or silver by vacuum evaporation.
Alternatively, it may be a conductive plastic or the like. As well known, the piezoelectric material
is (1) polarized in a direction that causes mechanical strain to generate a voltage. Conversely,
when + (it) electric field is applied, mechanical strain is generated to expand and contract the
material. In the present invention, the latter effect is used, and in addition, the transverse effect
of expansion and contraction in the direction perpendicular to the direction of the applied
voltage is used. If an electric field is applied to the electrodes a on the front and back sides in FIG.
2, the thin film (IG will expand and contract between the diaphragm (1) and the frame (6)). The
edge 21 has a frusto-conical shape. This is for effectively utilizing the above-mentioned
piezoelectric phenomenon, and its operation will be described with reference to FIG. In order to
simplify the description, consider a case where a sine wave as shown in @ 3 (1)) is inputted to the
voice coil of the speaker. At this time, when the sine wave is positive, the voice coil (3) and the
vibration jIi 111 coupled to n in FIG. 1 move forward (upward in the − plane) in FIG. It shall
move to 2 For example, when it is at point A in FIG. 3 (1), the edge (2) is extended to be in the
state of one-dot chain line of quadruple (a). When it is at point B, it shrinks and becomes a
broken line. The solid line in FIG. 3 (a) indicates the position in the stationary state. The
conventional edge having a semicircular arc shape corresponds to the back and forth movement
of the diaphragm by the deformation of the edge when a signal is applied, but the edge of the
present invention corresponds to the expansion and contraction in the present invention. It is
Then, as the basic property of the piezoelectric material, the distortion in proportion to the
applied voltage, that is, the displacement of expansion and contraction may occur, so that the
operation shown in FIG. 3 (a) can be easily realized. Next, a method of supplying power to the
edge (2) may be simply connected in parallel to the voice coil (3) with a polarity that satisfies the
If the displacement of the diaphragm (1) and the expansion and contraction of the edge (2) are
not in phase, insert the control circuit α on the way to the edge (2) as shown in FIG. May be That
is, the control circuit a3 is a passive circuit including a phase shift circuit and an attenuation
circuit. Furthermore, the present invention is not limited to the passive circuit, and may be an
active circuit provided with an amplification circuit in addition to the phase shift circuit and the
like. In the above embodiment, although the present invention has been described in which the
present invention is applied to an edge, as shown in FIG. 5, the present invention may be applied
to a spider or may be applied to both an edge and a spider. Further, although the edge or the
spider is a part of the conical surface having a straight cross section in the above embodiment,
the same effect as that of the above embodiment can be obtained even if the cross section is
curved as shown in FIG. . Moreover, although the shape of the edge or the spider mentioned the
thing convex with respect to the front surface of a speaker, it can not be overemphasized that it
may be concave. [Effects of the Invention] As described above, according to the present
invention, n is formed of a piezoelectric thin film having an electrode or an electrode on both
sides, and an electric field is applied to the im pole to expand and contract in phase with the
displacement of the diaphragm. As a result, even with large vibrations, the displacement of the
diaphragm is not limited. That is, sound 4! It has the effect of being able to reduce distortion in
Brief description of the drawings
FIG. 1 is a cross-sectional view of a speaker showing one embodiment of the present invention,
FIG. 2 is a detailed cross-sectional view of an essential part of FIG. 1, FIG. 3 is a detailed
illustration of the present invention, and FIG. FIG. 5 is a cross-sectional view showing another
embodiment of the present invention, FIG. 6 is a main portion cross-sectional view showing
another embodiment of the present invention, and FIG. 7 shows a conventional speaker. FIG.
In the figure, (1) the diaphragm, (2) the edge, (3) H voice coil, (4) the spider, (61 U frame, 4 ha
pressure! The injection thin film, αD is an electrode, and α2 is a control circuit. In the drawings,
the same reference numerals indicate the same or corresponding parts.
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