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JPS57119597

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DESCRIPTION JPS57119597
Specification L Title of Invention
Motional field pack speaker
3, detailed description of the invention is the acoustic characteristics of the speaker? It is related
to the MO V Jonalfield Pack (hereinafter MPII and Proton) type speaker intended to improve Y.
The electro-acoustic conversion of a general electrodynamic speaker has a unique back pressure
frequency characteristic Y and exhibits a non-linear characteristic. In and MFB methods have
been proposed in order to flatten sound pressure frequency characteristics and reduce non-linear
distortion. The MFB is configured C so as to detect the amount of movement of the vibration
system of the speaker and feed back the detected output to the drive system of the speaker to
control the motion of the vibration system of the speaker. Various methods have been proposed
as feedback methods for MFB 0. For example, voltage Y proportional to the speed of the
diaphragm is directly fed back to the input side. 5 The characteristic shown by the broken line in
FIG. 1 is indicated by the solid line in FIG. As shown, the effective mass of the speaker decreases
in proportion to the feedback amount, and the resonant frequency fog can be raised. Further, by
feeding back a voltage proportional to the acceleration Qjl of the diaphragm, the fO of the
speaker is lowered in proportion to the feedback amount as shown by the solid line in the broken
line in FIG. Further, there is also a method of feeding back a voltage proportional to the
displacement of the diaphragm. on the other hand! There are an electrodynamic type, an
electrostatic type, a piezoelectric type, etc. as a detection part of the momentum of the vibration
system of a speaker. The electrokinetic type is a method of providing a detection coil separate
from the driving voice coil, and is intended to obtain a signal corresponding to the shift amount
of the voice coil using the detection coil. In the electrostatic type, a movable electrode is provided
on a vibrating portion such as a diaphragm or a voice coil bobbin, and a fixed electric wire Y is
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provided on a solid foot opposite to EndPage: 1 and is constituted by the movable bridge and the
fixed electrode. Variable capacitance capacitors. In addition, the piezoelectric type is a method of
providing a vibrating portion C as a piezoelectric element. In any of the methods 2, the detection
signal must be speaker vibration S: faithful. However, the above-mentioned conventional method
has a defect that the detection signal is non-linear or lacks in fidelity due to frequency
characteristics. The present invention is made for such a point C: 4 and the vibration of the
speaker C: faithful electricity 4; @Yx The purpose is to provide an MFB type speaker intended to
be obtained. Concrete I: is an optical means 6; more intended to detect displacement of the
diaphragm of the speaker. The principle of the optical system used in the present invention C will
be described below. The fifth figure is a diagram of an optical system used in the MFB type
speaker of the present invention, wherein (11 is a light source, (2) is an eight-fif mirror, +31 is an
objective lens, and (4) is a diaphragm C of the speaker. The attached reflecting plate, (5) is a
cylindrical lens, and in this case, the cylindrical lens indicates the lens effect in the horizontal
direction C in the drawing.
(6) is a detector. A light beam (a light beam emitted from a light source 11 reaches an objective
lens 311 via an optical transmission (2)), is narrowed by the lens (31, and is reflected by a
reflecting plate (4F). In the reflecting plate (4), the light beam is reflected according to the
position, and the objective lens (31, half mirror (21Y through the cylindrical lens 150) is reached,
the astigmatism effect C; the detector section The low is the position of the reflector (4) [(The
original beam will arrive in different shapes depending on the two, ie, when one reflector (4) is at
the position of FIG. 3 (11)-two, detector Assuming that the position (6) is a true circle as shown
in FIG. 4 (1), the position (I) of the reflecting plate (4) C forward by Δ d; (: Shows a vertically
elongated oval, circular drawing, and the reflector (4) is displaced rearward by Δa (C1's ill: when
it comes, it becomes a 14 oval (0 opening; shown an elongated oval as shown). Therefore, as
shown in Fig. 2 s4, two elements (81) (82) (Jjjl,) (84) are divided into four '4' detectors (6) 'and
each element (81) (82) (8) (84)%: ツ Tunneling lens (5) is disposed at a 45 ° angle to the
direction in which the lens effect is exerted. Therefore, the operation output (at + sδ-8!) Of this
detector (6) -84) is zero (= when the reflection plate (4) is at the position of (kl), and is positive in
the case of (a) or negative-two in the case of 01). The positive and negative wedges are
proportional to the displacement of the diaphragm (= proportional). In this way (two □ invention
C; in the case of a cylindrical lens (50: depending on the effect of W point aberration depending
on The amount of variation of the speaker diaphragm can be known by the calculation output in
+6). Specifically, as shown in FIG. 5: (as shown, the central SC light source (lit 'of the central pole
Q of the beaker is provided, and the reflector plate 4 is attached to the inside Il of the dust cap U,
or the top Pre-,-) C3 (two light sources (1st floor, it is conceivable that the reflector (4) 1 is
attached to the opposing diaphragm u3). This FIG. 3C: principle diagram shown (= displacement
detection range of the optical system according to: optical conditions such as focal length of the
lens, (5) and objective lens (3), separation) are set according to (;). Also, a dynamic range of 60 ab
or more is usually obtained. Detection range: ± 5 ■ (; Fig. 6 shows an example of the
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relationship between the displacement when set and the operation output voltage; Speaker q
button = detection signal from the attached detector (6) is subjected to the above-described
calculation in the arithmetic circuit αS, and the calculation result of seven passes through a
speed or acceleration system: a substitution circuit to convert, then seven conversions
Comparison circuit [7) 4! Which compares t signal and original power signal and t.
It is manually powered, amplified by the amplifier QIC and applied to the speaker I. As apparent
from the above description, the present invention directly detects the displacement of a drive
system such as the diaphragm of a speaker, and from the detection signal, the speed, acceleration
F! Because of this, it is possible to improve the low frequency range characteristics with a large
amplitude, and the detection range of the low range is wide and linear, and the sound pressure
frequency characteristics are flat. The nonlinear distortion is reduced. Furthermore, the present
invention can detect displacement without being in contact with the vibration system I, and there
is no random frequency characteristic of the vibration system itself.
4. Brief description of the drawings 11, FIG. II & 2 is a characteristic diagram for explaining the
MFB effect, Is '5 is a principle diagram of the present invention MIi' B type speaker. Fig. 4 is an
enlarged positive curve of the main part, Fig. 5 is a cross-sectional view showing a specific
example of the speaker of the present invention, the sixth factor is displacement of the
diaphragm of the present invention, output magnetic pressure characteristics, and Fig. 7 It is a
block diagram of a drive system of a speaker of the present invention. EndPage: 2 (II is a ray, (2)
is a '-foil mirror, (31 is an objective lens). (4) shows a reflection plate, +5) shows a V-phosphor frical lens, (6) shows a detector, and V respectively. EndPage: 3
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