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Description 1, title of the invention
Speaker drive device
3. Detailed description of the invention The present invention relates to a speaker drive device,
and I Ц Ic according to the present invention, vibration noise of a sound force, distortion is
reduced by feedback to the drive system, resonance frequency sound ? It relates to a so-called
"motional feedback system" (Motional Feed-Back) ic. ░ Fig. 1 shows a conventional servo drive
system: (1) a signal generator for generating all the H source signals, (2) a signal from this signal
generator (1) and , And the feedback signal from the vibration detection big-ag coil ? ? ? ? of
the speaker (3) and the entire input, and an amplifier for amplifying the input among them and
outputting all the drive coil 01 vC of the speaker (3) and the drive signal. In the above-described
prior art, with the vibration i of the speaker (3), an electric signal corresponding to the frequency
of the pick-up coil for vibration detection (2) EndPage: 1 or the speaker is generated. Then, the
feedback of this electric signal to the amplifier (2) performs so-called momentum feedback
operation in which the distortion and distortion are reduced and the resonance frequency is
adjusted. Since the speaker (3) and the pickup coil (2) must be fully incorporated r'yn, there is a
drawback that the above-mentioned "monarial feedback system lt-can not be implemented with a
normal speaker". The present invention has been made by taking a look at such a point, and even
if it is an ordinary speaker without pickup coil complete, a simple VC "motional feedback system"
can be provided with all the speaker drive devices that can be implemented. It is That is, FIG. 2
shows an embodiment of the present invention, (1) a signal generator for generating ta original
signal, (2) u a signal from this signal generator (1), and described later The i @ l amplifier which
outputs the drive signal all the way to the drive coil 31 of the speaker (3) by amplifying both
inputs as feedback signal from the 2777 (9) and one person, the above speaker (3) Vibration part
C38) K-mounted light emitting element emitting light with predetermined brightness, (5) H light
from this light emitting element (4) optical wedge (6) E to be described later, a first focusing lens
for focusing, The optical wedge (6) has a predetermined density characteristic, for example, 1) = f
body (Du concentration, x ? the distance of the optical wedge (6) in the direction of the vibration
axis of the speaker (3)) The thing is used.
(7) The above-mentioned optical wedge (6) A second collective lens for condensing the totally
transmitted light and sound on the effective light receiving surface of the photodetector (8), (9)
tl! It is a second amplifier that amplifies the output signal from the above-mentioned detector).
Thus, in the center of the light emitting element (4), the first condensing lens (5), the optical
wedge (6), the second condensing lens (7) and the processing light detector (8), as shown in FIG.
It is needless to say that they are disposed on the same optical axis (0) for the processing shown.
The speaker drive 11 of the present invention! Since the J device is configured as described
above L, the original signal rff from the signal generator (1)! 1) Input (2) 2) Speaker (3) kffi The
signal is amplified to an optical part to move and input to the speaker (3) to drive it. The speaker
(3) is driven to vibrate at a predetermined amplitude in the direction of the ridge portion (aa) u of
the Vr-L and arrows (A) ? (B), so that the light emitting element (9 4) also vibrate together.
Therefore, the light of the vibrating light emitting element (4) is collected by the 1st focusing 7 7
(5) I / L! As a result, it is focused on the optical wedge (6) and becomes spot light of constant
brightness and vibrates in the direction of the arrow (C) ? ? + (1)). Then, the light quantity
modulation corresponding to the above-mentioned predetermined density characteristic (D = f
'(xl) VLL) and the fluctuation of the speaker (3) IJJJvL to the light totally transmitted through the
optical wedge (6)? In the state where it becomes the received light and is condensed on the light
receiving surface of the second condenser lens (7) K 19 photodetector (8), it vibrates in the
direction of the arrow (z) 4+ (F ?). The photodetector (8) converts the binary signal into an
electrical signal V and outputs it to the second amplifier (9). In addition, it is needless to say that
the length of the light receiving surface of the light detector (8) is sufficiently large, and there is
no L gap from the vibrating portion of the light spot. Then, the output signal output from the
light detector (8) is amplified to a predetermined value by the second amplifier (9) to 1-, and the
above amplifier t2) vt is fed back. Therefore, the following equation #L is obtained by backcalculating the vibration of the light spot on the optical wedge (6) from the magnitude of the
output signal of the amplifier (2) and the density characteristics of the optical wedge (6) Can. O
optical wedge (6) density characteristics D = ax ... [1] where D is the density, a is a constant, X in
the direction of the vibration axis of the speaker (3), optical-wedge (6) -Distance from pain. oa
degree to transmitted light amount characteristic T = 4 (D)... [2] where T is the transmitted light
O transmitted light quantity vs. quantity force signal characteristic Eo = KT иииииииии [3] where EO is a
constant of the output signal K. From the relationship between the above formulas [l] to [3], it is
possible to set E (E) to y (ax). [4] All can be determined. Also, in the above equation (2), 'l' = To +
ax ииииииииииииииииииииииииии [2] r However, it is% TOH reference transmitted light quantity . If the expression
EndPage: 2 is used, the above-mentioned expression is go = KTo-)-akx. Since (4) I, it is known that
the output signal is proportional to the vibration X. It is also possible to find the amplitude of the
mounting portion of the light emitting element (4) of the speaker (3) with respect to the vibration
X from the optical positional relationship of the light emitting element (4) with the optical wedge
(6). If this is changed, it only depends on reading the amplitude from the output signal EO. In the
above, the second condenser lens used in the above-described embodiment (the force is added
for the sake of easy understanding) is not always necessary. That is, transmitted light of the
optical sensor (6)? It is because the same effect can be obtained even if it is provided in the
vicinity of the all-optical wedge (6) such as a solar cell having a wide light receiving surface
which can be sufficiently detected. As described above, according to the present invention, the
light spot vibrates on the optical wedge (6) in response to the vibration of the scratching portion
(3a) of the speaker (3). And convert this light signal into a single electrical signal to the light
detector (8) and at the same time drive the loudspeaker (3) to a first a / c (2) VC-feedback for
distortion? Since the response characteristics of the speaker are significantly improved because
the frequency is adjusted by adjusting the common fitting frequency, the effect characteristic
that ?motional feedback method? can be implemented even with a conventional speaker with
no pickup coil is improved. Yes: It is. The other embodiment of the present invention will be
described with reference to FIG. 3. The same reference numerals as in the above-described
embodiment denote the same constituent members, and a description thereof will be omitted.
That is, in the above-described embodiment, the light emitting element (4) and the vibrating
portion (3a) of the sneaker (3) are mounted on the vibrating portion (3a). G: fixed foot part
attachment, the vibration part of the speaker (3) (3aJvL reflects the light of the light emitting
element (4) in the direction of the optical axis (0), ie, the first condenser lens 1.5) f- It is attached
to the reflecting plate ill 'to be made L, and its operation and vO effect are exactly the same as
those of the embodiment described above.
In the other embodiment, the optical path length between the light emitting element (4) and the
first condensing lens (5), the first condensing lens (5) and the optical wedge (6) 1), and the
change of the optical path length between the light emitting element (4) to be a speaker
oscillation 11b VLL and the first condenser lens (5). Since the variation of the spot size on the
optical wedge (6) can be neglected, the vibration of the speaker (3) 5 can be fully converted into
a sufficient vL% noise signal V as in the embodiment shown in FIG. It's too late.
4. Brief Description of the Drawings Fig. 1 is a block diagram showing a conventional speaker
driving apparatus 1 ', and Fig. 2 shows an embodiment of the present invention. The lock
diagram, 31st embodiment is a block diagram showing a second embodiment of the present
invention. In the drawing, (2) iil a / b, (3) rL speaker, (4) a light emitting element, (5) a condenser
lens, (6) an optical sensor, (8) a photodetector, 9) is a second amplifier, and (10 is a reflector. In
the figure, the same reference numerals indicate the same or corresponding parts. Agent Shin
Nono-EndPage: 3 Figure 5 Procedure Amendment (Spontaneous) Patent Office Secretary's Case
Display Case Patent Application No. 51-110568 Invention Name Title of Invention
Speaker drive device
Speaker drive device correction EndPage: 4 & correction target light # I ? "detailed description
of the invention" column 6, the contents of the correction) statement @ 3 jj line 4 and line 5
"motion null и feedback Correct the operation "t motional feedback operation". + 21. Correct the
description such as page 6 second row ?amplifier (2)? ? ?first amplifier (2)?. +81
Specification, page 6, line 4, "Upper amplifier (2)" is corrected as "the first amplifier (2)". + 41 H
mi N 7 j q line 2 ?ff 2 o = KT ? 0 + ak x j f? no, = x D ? + a K X J t 81 1 ? Positive tb ?. ??
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