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JPS54100713

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DESCRIPTION JPS54100713
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the main part
of the conventional speed type headphone, FIG. 2 is an explanatory view of a wavefront formed
by the headphone shown in FIG. 1, and FIG. A circuit diagram showing an equivalent circuit of a
headphone having a horn-like acoustic transducer, FIG. 4 is a schematic view showing a
modification of the headphone having a horn-like acoustic transducer, and FIG. 5 is a circuit
diagram showing its equivalent circuit. FIG. 6 is an explanatory view of a listening state showing
one embodiment of the present invention, and FIG. 1 is an explanatory view of a listening state
showing another embodiment. 1.22 ... electro-acoustic transducer, 8, 23 ... magnet, 9, 24 ... voice
coil, 10.25 ... vibrating membrane, 11 ... horn-like acoustic transducer, A1 A6 ... acoustic material.
Detailed Description of the Invention The present invention is a headphone or earphone.
(1)! p (J-yct-7 J3 General audio headphones should have the same characteristics as the ear
entrance characteristics when playing the ideal characteristic speaker as the characteristic to be
possessed by the normal reproduction distance (for example, 1.511) Ill) \ It is considered
necessary to be able to play at the time of radhon playback. According to another expression
method, the above-mentioned characteristic can be obtained by generating a plane wave outside
the center of a copy of a real copy. An object of the present invention is to provide a headphone
or earphone that can easily generate a plane wave in a so-called near sound field called
headphone reproduction (or earphone rehearsal). Conventional headphones for general audio
can be classified according to their structure: ■ Pressure type (closed type), ■ Speed type (open
air tying) In this method, the internal pressure is kept constant, and in this method the effect of
the pinnacle in the free sound field is not received in the morning. Also, the velocity type vibrates
as shown in Fig. 1! 11111, voice coil (2), magnet (3), damper (4), ear contact 1 The effect of the
pinna is expected in a reproduction system in which the speaker is brought close to the ear.
However, as the ear pad (5) touches the pinna directly and it acts with considerable side
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pressure, the pinna is extremely deformed and the vibration a! (11 is inside # of the live-action,
inside the temple. FIG. 2 is an explanatory view showing a wavefront (6) state (four phases [ml])
formed by the diaphragm (1) of the velocity type headphone, whereby the sound wave generated
from the diaphragm (1) is withdrawn. In the vicinity of the moving film (1), it is considered to be
a plane wave, but it can be understood that it is strange to be a deformed spherical wave when it
is slightly away from the vibration Vl $ 11. Therefore, when the speed type headphone is
operated away from the pinna, a deformed spherical wave is generated. That is, the conventional
headphones have a disadvantage that a plane wave can not be generated outside the acoustic
center of a real shot. The present invention solves the above-mentioned drawback t-and an
embodiment thereof will be described based on the drawings. In FIG. 7, t7) Fi magnet (an
electroacoustic transducer comprising a button, a Heus coil (9), and a diaphragm O 妨), and a
horn-like f4 transducer at the opening of the electroacoustic transducer (7) (J) The small end of
the open area of al is connected. The headphone with the above configuration narrows the end
immediately before the diaphragm, that is, the end closer to the diaphragm of the acoustic
diaphragm 0 to increase the acoustic resistance, and gradually approaches the end farther from
the time of the vibration 11110 By increasing the cross-sectional area and lowering the acoustic
resistance K, that is, by making the acoustic converter Q-shaped in a horn shape, impedance
matching with air is improved to generate a plane wave, The equivalent circuit is one in which
the mechanical impedance (d) of the vibration system and the radiation resistance qq of nine airs
are connected in series to one signal source (2) as shown in FIG.
Therefore, as shown in FIG. 7, when the headphones of the above-mentioned configuration are
operated at a position that is appropriately separated from the entrance of the ear canal of the
listener (d), a plane wave is generated outside the center of the copy of the copy of the listener
Because the listener's auricle @ is not in contact with the headphones at all and is in a natural
form, the listener (2) is placed far away and has the same acoustic characteristics as the friend
speaker playback line in the ear entrance It is possible to listen to the natural sound of the juice
localization that is likely to be received during headphone reproduction and that is relaxed in (4)
22. On the other hand, when the headphones having the above-described configuration are
schematically shown in step-like blocks as shown in FIG. 4, they can be decomposed into
equivalent circuits as shown in FIG. Note that (d) is an electroacoustic transducer, (d) is a wall
surface that schematically represents a horn-like acoustic transducer in a step-like block,-is the
mechanical impedance of the vibration system, (2) is a signal source, (Z +) (Z ·) is the t-echo
impedance of the portion of each cross-section. As a way to satisfy the line v +, 廿 emitted from
the electrical writing transducer through the f # material of several different acoustic impedances
It is conceivable to regenerate the waves. A headphone based on such a concept is shown in FIG.
In FIG. 6, 4 is a magnet (2), Pois caru 1 v-1 swing II! @ 1itJ recording device, which is an electric
iron J hair changer made of lFs, and # if # materials (Al) to (A,) are provided in layers on one
surface of the lossless movement (2). The materials (A,) to (A,) have the highest postscript
impedance of the # excellent material (At) on the side close to the * [+ film (2), and become
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progressively lower toward the outside @, the acoustic material When the acoustic impedance of
(A ·) is low (荀-in such headphones, the layered acoustic materials (A1) to (A ·) have horn-like
acoustic transducers (ii) (FIG. 7) and Since it works in the same way, mismatching between the
mechanical acoustic impedance of the vibrating membrane (2) and the specific resistance of air is
eliminated, and a plane wave is generated. Therefore, as shown in FIG. 6, when this headphone is
operated at a suitable distance from the outer ear 1 population (2) of the listener, a plane wave is
generated outside the acoustic center of the real person of the listener. Because the ear leakage
of the listener is not in contact with the headphones at all and is in a natural form, the listener
receives the same acoustic characteristics at the ear entrance as the speaker reproduction sound
placed far away, and the headphones You can listen to the relaxed natural neck of the in-head
localization that is typical for playback. In the above embodiment, although the headphone has
been described, it is needless to say that this can be applied to an earphone.
As described above, according to the fourth invention, since the acoustic conversion is performed
so that the acoustic impedance gradually decreases along the radiation direction of the # wave,
the listener's (-) (9 By playing back in the normal position, the IHC plane wave outside the
acoustic center of the listener's live-action is generated, and [2] the listener does not come into
contact with the ear of the listener and deform it. It is possible to listen to the natural reproduced
sound of relaxed in-head localization of the sound image while being headphone reproduction,
and its industrial use m value is extremely large. 7
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