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JPS4841234

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS4841234
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of the flat panel
speaker according to the present invention, FIG. 2 is a longitudinal sectional view along line A-A,
FIG. 3 is a partially enlarged view thereof, FIG. FIGS. A-C, 5 and 6 are equivalent circuit diagrams
of the vibration system of the speaker of the present invention, and FIG. 7 is a frequency
characteristic diagram. 1 иии и и и и и и и flat E и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и vibration drive source + -1 ?, -A3lLA-81- real opening 48-41234 (2) Mf, + -5 concave
7PtI2mC1 '? ne2m ?l 3 ? / c / t king [A ? Kot [Nito-F is beta-82-(db) actual opening view 48-4
1234 (3) f 7 ? 50100 200 500 {0002000500010000 circumference shell number (1Z) ??
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a flat plate speaker is
used, and when connecting a flat diaphragm and a voice coil as a noise drive source to a bobbin
of a voice coil, a conical diaphragm is connected to a flat opening & L, The above-mentioned
bobbin is joined to this conical diaphragm portion with a small apex angle, and a flat plate
speaker with a small junction 7D compliance between the diaphragm and the bobbin is provided.
In general, a flat-plate speaker can be used as a speaker that can be configured to be large and
thin, and can obtain plane waves (1),... Heretofore, this flat plate speaker has often used a
configuration in which a flat foam plastic plate is used as a diaphragm to drive it. However, in
this conventional flat loudspeaker, since a single flat diaphragm is used, divided vibrations occur
particularly in the middle to high frequency, and a large peak or dip is produced in the middle to
high frequency in the frequency characteristic, and so-called And the playback sound quality is
extremely poor. Furthermore, the angle between the flat diaphragm and the extension of the
voice coil bobbin (ie, the apex angle or opening angle) is an extremely large angle with qoo (right
angle), and the compliance between the diaphragm and bobbin junction is large, particularly
high. There is a drawback that the frequency characteristic in the region is not extended and a
satisfactory frequency characteristic can not be obtained. The present invention eliminates the
above disadvantages and will be described with reference to the accompanying drawings. 1 and
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1 show a front view of an embodiment of a flat speaker (2) 4El-41234-03 according to the
present invention and a longitudinal side view taken along the A-AfIIK. In both figures, reference
numeral l denotes a flat diaphragm made of, for example, expanded polystyrene, whose outer
shape is a square and has a circular opening / a at its center (note that the position of the
opening / a is at the center). Not limited stone). An outer peripheral edge portion of the flat platelike diaphragm 1 is held in the paper making housing 3 by an edge material such as rubber. Da
is, for example, a conical diaphragm which is sharper than cone paper, and the outer shape has a
nine-circular shape with a diameter larger than the diameter of the opening of the flat diaphragm
l, / iB. The conical diaphragm d has an outer peripheral edge << a of, for example, a latex sponge
with a single stone bonding material j and an inner peripheral edge in the vicinity of the opening
/ eL of the flat diaphragm as shown in FIG. Part / blC adhesively bonded. Here, as a binder, it has
a mechanical resistance substantially equal to or close to the characteristic mechanical
impedance seen from the outer peripheral edge portion 6 of the conical diaphragm q, and only
the lateral vibration of the present flat diaphragm l. It is formed of a material having a
compliance of longitudinal vibration approximately equal to or near the equivalent compliance
(in this case, compression elongation vibration of (3), 48 + 1 ? ? + 1234-04 thickness direction
of the bonding material j). .
The rubber hardness of the bonding material j is selected in the range of 3 degrees to 30
degrees. The inner peripheral edge portion <tb of the conical diaphragm ? is fixed to a bobbin 7
around which a helical coil t is wound. Since the diaphragm g has a conical shape, the apex angle
(aperture angle) e between the diaphragm dab and the extension line of the spiral coil bobbin 7 e
beam O0 or less 61 indicates a driver unit, a magnetter, a top p v ? 10. It is a pole piece //
formed integrally with the bottom plate v-). ?????????? Next, the operation of the
above-described speaker will be described. FIGS. 1 to 8 show an equivalent circuit of a vibration
system of the above-described speaker. Fig. 3 shows the equivalent circuit of (q) vibration
system. Figure (g) shows the equivalent circuit of the vibration system consisting of voice coil etc.
and conical diaphragm l, / jd vibration drive source, 5 isch coil 6 and coil of bobbin 7 and Cv is
voice coil l bin 7 Compliance according to the apex angle # at the junction Kb between the disc
and the conical diaphragm g, m, 1. m, and 0. Respectively represent the mass and compliance of
the flat diaphragm and can be considered as being in the illustrated connection. The same figure
(c) shows the equivalent circuit of the vibration system consisting of the bonding material j,
?(+11 R 02 and C 0 respectively represent the resistance valve and the compliance of the
bonding material j connecting between the diaphragm 1 and It is related. The resistance valve
R61 e R 02 is in a relation of Ro, R, 1. The same figure (Q shows the equivalent circuit of the
vibration system which consists of a flat diaphragm 1 and is fnll. Sacrifice f and Cf represent the
mass and compliance of the flat diaphragm / respectively, r and C1 represent the resistance valve
and compliance at the outer peripheral edge of the flat diaphragm 1 respectively, and they are in
the connection relationship shown respectively. As described above, in the state m in which the
diaphragm d and 7 are integrally connected through the bonding material j, the terminals t! . The
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'ME's and the terminal axes +' 4 + '-are connected to each other. Here, we will consider the
operation state * in which vibration drive is performed by the voice coil 6. First, at low
frequencies, the compliance C of the bonding material j can be neglected, so that the overall
circuit is as shown in FIG. As is apparent from this figure, the current from the equal side drive
source 13 is the vibration plate <<<. t, ? 6. And flows through ? 7t + ? 72 of the diaphragm l.
Therefore, in the low frequency band, the diaphragms ? and 1 integrally vibrate as a whole
composite diaphragm. Next, in the middle to high frequency, the compliance O0 of the bonding
material j can not be ignored.
At this time, C0 connected in parallel to the resistance component R6 substantially short-circuits
both ends of the resistance component R02 in the middle and high frequencies, and the
resistance component R6I (<< R as the vibration system of the bonding material j) ,,,) may be
considered only. Therefore, most of the current from the drive source 13 flows through the
resistance component K, the equivalent of the vibration system of the diaphragm 1 can be
ignored, and eventually the whole circuit becomes as shown in FIG. . Therefore, the current from
the equilateral open-loop drive source 13 flows only through -8-1 of the diaphragm IK, and the
diaphragm l does not vibrate in the middle high range, and almost only the diaphragm (6)
vibrates. . At this time, the bonding material j absorbs the vibration of the diaphragm and does
not transmit the vibration to the diaphragm /. The states of vibration in the low band and the
middle high band described with FIGS. 3 and 6 are books showing typical states for easy
understanding, and in the frequency range from the low band to the middle high band, the
vibration is There is a state in which the plate l vibrates and the diaphragm l slightly vibrates, and
this is not a book which causes any discontinuous state on the frequency characteristics. The
frequency characteristics of the flat speaker according to the present invention and the
conventional flat speaker are shown in FIG. In the same figure, the curve 1 shows the frequency
characteristic of the flat panel speaker of the present invention, and the curve ri shows the
frequency characteristic of the conventional flat panel speaker. In the flat panel speaker
according to the present invention, as described above, since the entire diaphragm made of the
diaphragm and l is vibrated integrally in the low band, as shown in FIG. There is no change in
frequency characteristics. However, in the middle and high range, only the light conical
diaphragm vibrates, so (7) the division vibration does not occur as in the prior art, and even if it
occurs, it shifts to a very high frequency region, and curve 1.11 in the same figure As is apparent
from the comparison of the characteristic O-aparж in the middle and high regions is greatly
improved and becomes a flat characteristic. Furthermore, since the apex angle ? between the
conical diaphragm da and the voice coil bobbin 7 has a small angle of not more than 900, the
compliance at this connection portion is small and the high frequency vibration is well driven
and the high frequency The characteristics are extended. Since the bonding material j has a
mechanical resistance close to the characteristic mechanical impedance of the outer peripheral
edge portion ga of the conical diaphragm, the outer peripheral edge portion uaKb of the
diaphragm e does not cause reflection. As described above, since the flat speaker according to
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the present invention is formed of a flat diaphragm in which a conical diaphragm joined to a
voice coil bobbin with a small apex angle is joined, the diaphragm and the bobbin The
compliance of the junction part of the book is small, and it is a book having features such as
being able to obtain a flat plate speaker having a good frequency characteristic and being driven
well in a high frequency range.
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