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JPS5224926

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DESCRIPTION JPS5224926
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cabinet of a television
receiver according to the present invention, and FIG. 2 is a sectional view of the main parts
showing the installation state of the cabinet of the television receiver according to the present
invention. FIG. 4 is a perspective view of the holder showing a state in which the holder is
attached to the cabinet. In the drawings, 1 is a main cabinet, 2 is a bottom of the main cabinet, 3
is an auxiliary cabinet, and 4 is a holder. Reference numeral 5 denotes a holder mounting hole, 7
denotes a support of the main cabinet, 9 denotes a back of the auxiliary cabinet, and 10 denotes
a bottom of the auxiliary cabinet. Fig. 1 1 51 51 開 4724926 (2) Fig. 2 Fig. 3-52-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a back load horn
type speaker capable of obtaining high efficiency and uniform sound pressure response in the
bass region and adjusting the sound pressure response vs. frequency characteristics in the
middle sound region. is there. As conventionally known, the bank load horn type speaker 10 is
shown as shown in FIG. 1, and one end of the acoustic path 3 is coupled to the back surface of
the cone 2 of the direct radiation speaker 41. Oh. Treble area. The speaker 41 is composed of an
open surface of the cone 2 of the above-mentioned speaker (an acoustic capacity for converting
the output from the horn 4 to the side of the crucible 2A). In the back load horn type speaker 10
as described above, the mechanical reactance of the compliance CM in the space on the back
surface 2B side of the cone 2 of the speaker 1 is large compared to the mechanical impedance
ZM of the throat of the horn 4 in the bass region. It has become. Therefore, in the bass region,
the cone 2 of the speaker 1 is directly coupled to the sound passage 3 of the horn 4 so that the
reproduced sound from the speaker 1 is radiated to the outside through the horn 40 opening 5.
When the frequency of the reproduced sound increases and the mechanical reactance of the
compliance CM becomes smaller compared to the mechanical impedance 7 and M of the throat
of the horn 4, the sound pressure response from the horn 4 is attenuated and reproduced. Since
most of the sound is radiated to the front 2A side of the cone 2 of the speaker 1 and to the
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outside, the back load horn type speaker 10 operates as a direct radiation speaker in the middle
sound area and the high sound area. (2 Therefore, the sound pressure response versus frequency
characteristics of the backroth horn type speaker 10 are shown as in FIG. 2, and high efficiency
and uniform high voltage response can be obtained in the bass region, so they are commonly
used conventionally The In FIG. 2, a portion where the operation by the horn 4 and the operation
as the direct radiation speaker overlap is shown by a broken line and a dashed dotted line. Then,
in the case of actually using the above-mentioned Backrotohorn type speaker, the characteristic
of an amplifier (not shown) to which the speaker is connected is adjusted or an attenuator (FIG.
When equipped, the above-mentioned attenuator was adjusted to control the characteristics of
the human-powered signal to the speaker so as to obtain the user's favorite tone. However, as
described above, in the operation of the back load horn type speaker, the state of operating as a
direct radiation speaker in the middle sound class and the high sound area and the reproduced
sound is emitted through the horn in the low sound area 3) There is a state.
A control mechanism that allows the user to control the frequency at which the above two states
are switched is not equipped to a conventional back load horn type speaker, but adjusts the
output characteristics of the backroth horn type speaker itself. , I could not get the user's favorite
tone. The present invention was devised to solve the above-mentioned drawbacks, and it is
possible to change the frequency characteristic of the mid-tone range so that the user can listen
to the desired tone color, That is, the back surface of the speaker contained in the speaker unit
and the end of the acoustic passage contained in the horn part with one end communicating with
the opening are acoustically coupled through the opening provided in the coupling part It is a
back load horn type speaker characterized in that the amount of openings of the abovementioned openings is adjustable. Hereinafter, the present invention will be described in detail
with reference to the drawings showing an embodiment. (The sound passage 42 in which the
partition plate 41 is appropriately provided is formed in the inside of the 41 horn unit 40, one
end of the sound passage 42 communicates with the opening 43 provided in the horn unit 40,
and the other end Is communicated with the opening 75 of the connecting portion 70 provided
on the upper wall surface 44 of the horn portion 40 in FIG. Further, the back surface 55 B side of
the light sinker 55 incorporated in the speaker unit portion 50 communicates with the opening
75 of the coupling portion 70 at the bottom portion 51 of the speaker unit portion 50 and is
connected to the acoustic passage 42 of the horn portion 40. The back surface 55 B side of the
speaker 55 of the speaker unit portion 50 is acoustically coupled, and the speaker unit portion
50 is rotatably mounted on the horn portion 40 by the coupling portion 70, and a back load horn
type speaker 60 are configured. Here, as shown in FIGS. 4 and 5, the connecting portion 70 is
formed such that its tip is in the form of an inward flange around the circular opening 52
provided in the bottom portion 51 of the speaker unit 50. The first engaging portion 54 on which
the cylindrical tube portion 72 provided with the first rectangular aperture 71 in the flange (the
9-shaped portion is erected, and the opening of the second A cylindrical tubular portion 45
having holes 73 and made of an elastic material such as rubber is fixed and a tip end is formed in
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the outward flange shape is erected on the wall surface 44 of the horn portion 40 And a second
engaging portion 49. The first holding portion 54 and the second engaging portion 49 are
engaged with each other. In the connecting portion 70 as described above, the first rectangular
aperture 71 and the second rectangular aperture 73 are superimposed as shown in FIG. An
aperture 75 is formed to acoustically couple the back surface 55B side of the rear surface 55B to
the acoustic passage 42 of the horn portion 40.
Therefore, the area of the opening 75 is changed by rotating the speaker unit 50 around the joint
portion 700 and the cylindrical portion 45, so that the amount of opening can be adjusted. The
mechanical impedance Zi + of the throat of the horn as described in (6) in the prior art is
determined by the amount of openings, and if the mechanical innoance of the throat of the horn
is changed, the broken line in FIG. And, as shown by the dashed-dotted line, there are a state in
which the back light horn type speaker 60 operates as a direct radiation speaker, and a state in
which reproduction sound is emitted to the outside through the opening 43 through the acoustic
passage 42 of the horn portion 40. It will be possible to adjust the switching frequency and
adjust the sound pressure response vs. frequency characteristics in the medium sound region. In
the present embodiment, the adjustment of the opening amount is performed by the turning
operation. If it is a mechanism which can change an area and can adjust the amount of openings,
it does not need to depend on rotation operation. As described above, according to the back load
horn type speaker according to the present invention, the sound pressure response versus
frequency characteristic in the middle sound region of the back load horn type speaker main
body can be adjusted, so that it can be used without depending on the characteristic adjustment
of the amplifier etc. The person can listen to the reproduction sound of the desired tone.
Therefore, the desired purpose can be achieved (η \, f).
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