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JPH0273800

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DESCRIPTION JPH0273800
[0001]
[Industrial field of application] This invention is on the front of the speaker cabinet. The present
invention relates to a combined direct emission speaker device in which a main speaker and an
auxiliary speaker are disposed front and back). [Conventional technique m] FIG. 3 is a side
sectional view showing a conventional combined direct emission speaker device shown, for
example, in rMobil Elect-Ronic 5 pecial jstJ issued in April 1988, and (1) is a bass reflex type
cabinet , (2) is a bass reflex boat, (3) is an auxiliary speaker attached to the front face (1a) of the
cabinet (1) to be housed in the cabinet, (4) is a magnetic circuit of the auxiliary speaker (3), 5) is
a main speaker disposed opposite to each other so that the diaphragms face the front of the
auxiliary speaker (3), (6) is a magnetic circuit of the main speaker (5), (7) is an auxiliary A frame
having an opening (7a) of the speaker (3). (8) is a frame having an opening (8a) of the main
speaker (5). Next, the operation will be described. When a signal is applied to the main speaker
(5) and the auxiliary speaker (3), the diaphragms of the main speaker (5) and the auxiliary
speaker (3) vibrate in opposite phase with each other, Swing in the same direction by reversing
the polarity of the input terminal! PI] can be done. That is, vibration is performed in the same
phase, and the sound pressure reproduced by the -t speaker (5) passes through the open 1] 7
(8a) formed in the frame (8) of the -L speaker (5) and radiates to the outside Be done. The main
speaker (5) and the auxiliary speaker (3) are mainly bass speakers, and provide rich listeners
with bass reproduction. [Problems to be Solved by the Invention] Since the conventional
combined type direct radiation speaker device is configured as described above, sound radiation
from the main speaker-(5) is blocked by the magnetic circuit (6), and the frame ( 8) through 8).
For this reason, the directivity of the sound radiated from the speaker is significantly disturbed,
and there is an incompatibility point that the sound pressure level of the center axis old is
significantly lowered compared to the sound pressure of the peripheral portion. The present
invention has been made to solve the problems such as -F, and secures a sound pressure level as
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high as -L on the central axis of the -L speaker, and @ It is an object of the present invention to
obtain a composite direct emission speaker device that can be obtained. [Means for Solving the
Problems] In the combined direct radiation speaker device according to the present invention,
the magnetic circuit of the main speaker disposed on the front side of the cabinet is constituted
by an external magnetic circuit, and the main speaker and the auxiliary speaker The air space of
the main speaker is the air room of the main speaker, the space of the cabinet and the auxiliary
speaker is the air room of the auxiliary speaker, and the ball part of the magnetic circuit of the
main speaker is the air room of the main speaker and the outside And an opening for
communicating the
[Operation] The composite direct radiation speaker device according to the present invention
emits sound from the speaker through the opening of the ball piece of the main speaker
magnetic circuit and the opening of the frame, and a sufficient sound pressure level is obtained
even on the central axis of the main speaker. Secured. An embodiment of the present invention
will be described below with reference to the drawings. FIG. 1 is a side sectional view showing
one embodiment of the present invention, and FIG. 2 is a partially omitted side view showing a
mounting example of this embodiment. In the figure, (lO) is a speaker cabinet, (11) is an auxiliary
speaker mounted so as to be housed in the 5 cabinets on the front (10a) of the cabinet (10), (12)
is the front (loa) of the cabinet (10) ), The main speakers mounted so as to be disposed on the
front side of the cabinet, (13) and (14) are the frames of the above-mentioned speakers, and (+
3a) and (14a) are the openings provided in the frames (13) and (14) , (+5) (16) are the
diaphragms of the above-mentioned speakers, (17) (18) are spiders for supporting the
diaphragms (+5) (16) of the above-mentioned respective speakers, (19) (20) are the same In each
of the magnetic circuits, the magnet (21) (22), the plate (23) (24) and the ball piece (25) (26) To
form a circuit. Further, (26a) is an opening provided in the ball piece (26) of the main speaker,
(27) is an air chamber of the auxiliary speaker (11), and (28) is an air chamber of the main
speaker (12). Note that (29) in FIG. 2 is a dustproof net consisting of a saran net (trade name) etc.
covering the external magnetic type magnetic circuit portion of the main speaker (12) for
dustproof when the speaker device of this embodiment is mounted. It is. In the above
configuration, the auxiliary speaker (11) is attached to the front (loa) of the sealed cabinet (10),
and the diaphragm (15) of the auxiliary speaker (11) and the main speaker are attached to the
front of the auxiliary speaker (11). The main speakers (12) are connected in cascade so that the
diaphragms (16) of (12) face each other. As a result, the space between the cabinet (0) and the
auxiliary speaker all functions as the air chamber (27) of the auxiliary speaker (11), and the
space formed between the auxiliary speaker (11) and the main speaker (12) is It will act as an air
chamber (28) for the main loudspeaker (12). Then, the sound from the main speaker (12) is
divided into two, and one passes through the opening (26a) provided in the ball piece (2G) of the
main speaker (12), and the center of the main speaker (12) The radiation is emitted to the
listener on the axis, the other through the opening (14a) provided in the frame (14) of the main
loudspeaker (12) and emitted to the listener in the periphery of the main loudspeaker (12) Be
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done.
In this way, a sufficient sound pressure level is secured even on the central axis of the main
speaker, and directivity such as-in the listening area is provided. Although in the above
embodiment the flat type was used for the diaphragms (15) and (16), the present invention is not
limited to this, and it is equally possible to use a diaphragm of a cone type or a diaphragm of a
square or a circle. Play an effect. Furthermore, the shape of the opening (26a) of the ball piece
(26) of the main speaker (12) is not limited to a simple cylindrical shape, but also to a hornshaped ring whose cross-sectional dimension increases toward the outside. Of course it is good.
[Effects of the Invention] As described above, according to the present invention, the magnetic
circuit of the main speaker disposed on the front side of the cabinet is constituted by the external
magnetic circuit, and the space formed by the main speaker and the auxiliary speaker As the air
chamber of the main speaker, and the space formed by the cabinet and the auxiliary speaker as
the air chamber of the auxiliary speaker, and the ball piece of the magnetic circuit of the main
speaker has an opening that communicates the air chamber of the main speaker with the outside.
Since the provision is made, a sufficient sound pressure level can be secured even on the central
axis of the main speaker, and it is possible to provide directivity such as-in the listening area.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a side sectional view showing one embodiment of the present invention, FIG. 2 is a
partially cutaway side view showing an implementation example of this embodiment, and FIG. 3
is a side showing a conventional composite direct radiation speaker device FIG.
In the figure, (10) is a speaker cabinet. (10a) is the front of it, (11) is the auxiliary speaker, (12) is
the main speaker, (13) (14) is the frame, (15) (16) is the diaphragm, (19) (20) is the magnetic In
the circuit, (25) and (26) are ball pieces, (26a) are openings, (27) and (28) are air chambers, and
(29) are dustproof nets. The same reference numerals in the drawings denote the same or
corresponding parts.
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