JP4826456B2 - Electroacoustic transducer and ear speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a listener to listen to a high-quality reproduced sound while providing natural sound image localization to the listener. <P>SOLUTION: An electro-acoustic converter comprises a speaker unit 7L attached to a case section 4L worn at a prescribed position of the head of the listener, and disposed at a prescribed distance from the entrance of the external auditory canal of the listener when the case section 4L is worn to the head of the listener, a tubular duct 8L extended so as to guide the sound generated at the case section 4L to around the entrance of the external auditory canal of the listener, and a microphone MF1L for binaural recording attached in the vicinity of the speaker unit 7L. Since sound from a sound source can be collected and binaurally recorded by using the microphone MF1L for binaural recording attached in the vicinity of the speaker unit 7L whereby the listener actually listens to reproduced sound, sound at an adequate level can be listened to by the listener via the tubular duct 8L, while giving furthermore natural sound image localization to the reproduced sound in comparison with prior arts. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an electroacoustic transducer and an ear speaker device, and is suitable for application to, for example, a head-mounted wearable speaker device.

  2. Description of the Related Art Conventionally, in a headphone device that is an example of a head-mounted wearable speaker device, an audio signal representing a playback sound of a CD (Compact Disc) or the like is mounted on a listener's head (hereinafter, this is played back). That have been made to be listened to by the listener are widely used.

  In a general headphone device, a speaker unit that generates reproduced sound is positioned near the front of the listener's ear canal entrance, and the sound quality is improved by allowing sound to reach the eardrum directly from the speaker unit. Although improved, the sound image was localized in the listener's head, giving the listener an unnatural impression.

For this reason, in some headphone devices, the speaker unit is slightly separated from the ear canal entrance (ear hole) and positioned on the forehead side, so that the sound image is out of the head as in the case of a general stationary speaker. It has been devised to eliminate the unnatural feeling by localization and to make it possible to hear a sufficient bass by making a sealed type with a sealed space around the listener's ears (for example, patents) Reference 1).
Japanese Patent No. 3054295 (page 3, Fig. 1)

  By the way, in the headphone device having such a configuration, even when the speaker unit is slightly separated from the ear canal entrance (ear hole) and positioned on the frontal side, the reproduced sound of the content listened to by the listener is a stereo source sound source. The sound image is localized in the listener's head, and there is a problem that the unnatural feeling cannot be dispelled.

  The present invention has been made in view of the above points, and an object of the present invention is to propose an electroacoustic transducer and an ear speaker device that allow a listener to listen to high-quality reproduced sound while giving natural sound image localization.

In order to solve such a problem, in the present invention, when the casing is attached to a predetermined position of the listener's head and one surface of the casing, the casing is attached to the listener's head. A speaker unit provided with a predetermined distance between the listener's ear canal entrance, a tubular duct extended so that the sound generated from the front of the speaker unit reaches the vicinity of the listener's ear canal entrance, and the speaker unit. And a tubular duct is formed in a substantially U-shape extending from the housing portion to the vicinity of the listener's ear canal entrance and returning to the housing portion again, near the listener's ear canal entrance. A hole for sound emission was provided.

  This enables binaural recording by collecting the sound from the sound source using the binaural recording microphone provided near the speaker unit where the listener actually listens to the reproduced sound. While giving a more natural sound image localization than in the past, mainly middle and high sounds generated by the speaker unit through the tubular duct can be directly reached from the vicinity of the listener's ear canal to the eardrum in the ear canal.

According to the present invention, binaural recording can be performed by collecting sound from a sound source using a binaural recording microphone provided in the vicinity of a speaker unit where a listener actually listens to reproduced sound. With regard to audio, electroacoustics that can cause sound and sound localization that is more natural than conventional ones to directly reach the eardrum in the ear canal directly from the vicinity of the listener's ear canal entrance, mainly through the tubular duct through the speaker unit. A converter and an ear speaker device can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail by dividing it into a first embodiment and a second embodiment.

(1) First Embodiment (1-1) Configuration of Ear Speaker Device In FIGS. 1, 2 and 3, reference numeral 1 denotes the ear speaker device according to the first embodiment as a whole, which is a portable CD (Compact An audio signal generated by a playback process or the like of a (Disc) player or a DMP (Digital Music Player) is converted into a playback sound, which is listened to by a listener.

  The ear speaker device 1 is premised to be mounted on the head of a listener like a headphone device, unlike a general box-shaped speaker device, and is roughly divided into an electroacoustic that converts an audio signal into reproduced sound. It is comprised by the conversion parts 2L and 2R and the band part 3 for mounting | wearing and fixing the said electroacoustic conversion parts 2L and 2R to the listener's head.

  The electroacoustic transducers 2L and 2R are configured around casings 4L and 4R that are shaped like a sphere divided into four equal parts in the vertical direction. The casing portions 4L and 4R are respectively formed with flat portions on the rear surface side and the left and right inner sides, and pad portions 5L and 5R for relieving the lateral pressure on the listener's head are attached to the left and right inner sides.

  Speaker units 7L and 7R for converting an audio signal into reproduced sound are attached to baffle plates 4AL and 4AR, which are planar portions on the rear side of the casing portions 4L and 4R. The speaker units 7L and 7R are configured to emit sound by vibrating the diaphragm in accordance with an audio signal supplied from a portable CD player, DMP, or the like via the connection cable 6.

  Further, tubular ducts 8L and 8R made of metal and having a hollow member having a predetermined thickness bent into a substantially U-shaped side surface are attached to the baffle plates 4AL and 4AR of the casing portions 4L and 4R. As shown in FIG. 1, the tubular ducts 8L and 8R have outer end portions bent in the left and right inner directions, respectively, and are further provided with holes 8AL and 8AR at substantially the center of the rear end portion, respectively. .

  The band portion 3 is formed in an approximately arch shape convex upward in accordance with the shape of a general human head centering on the central portion 3A, and slides freely in relation to the central portion 3A. The overall length of the band unit 3 can be adjusted by the adjustment units 3BL and 3BR to be obtained.

  The band portion 3 is formed in an arch shape having a diameter smaller than that of a general human head and has an elastic force. When the band portion 3 is attached to a listener, the casing portions 4L and 4R are attached. When mounted while being spread left and right, the casings 4L and 4R are held in contact with the listener's head in order to return to the original shape by the action of the elastic force after mounting. Has been made.

  In addition, since the ear speaker device 1 is configured substantially symmetrically as shown in FIGS. 1 to 3, the following description will mainly focus on the left electroacoustic conversion unit 2 </ b> L as an example.

  In practice, as shown in the left side view of FIG. 4, the ear speaker device 1 is attached to the listener's head 100 after the length of the band portion 3 is adjusted, whereby the lower end side of the adjusting portion 3BL. The electroacoustic transducer 2L attached to the head is positioned slightly in front of the auricle 101L in the listener's head.

  As a result, the electroacoustic conversion unit 2L of the ear speaker device 1 causes the mid-high sound radiated from the speaker unit 7L to directly reach the inside of the ear canal of the listener, and also the reflected sound reflected by the listener's cheek, the auricle 101L, and the like. Since it can reach the inside of the ear canal, a natural sound image localization similar to the case of listening through a general stationary speaker can be provided.

  At this time, when the ear speaker device 1 is normally attached to the listener, the speaker unit 7L is positioned slightly in front of the auricle 101L and the ear canal entrance 102L, and the hole 8AL of the tubular duct 8L is in the vicinity of the ear canal entrance 102L. It is made to be located in.

  Incidentally, the tubular duct 8L is formed so as not to enter the listener's external auditory canal because the tip thereof is formed in a substantially U shape. Thus, the ear speaker device 1 can prevent the listener from accidentally damaging the ear canal by the tubular duct 8L when the ear speaker device 1 is mounted.

  Here, as shown in FIG. 5 in the Q1-Q2 cross section in FIG. 4, the housing portion 4L forms a sealed space except for the tubular duct 8L with the speaker unit 7L attached thereto. On the other hand, a resonance circuit is formed by the housing portion 4L and the tubular duct 8L.

  Further, the tubular duct 8L penetrates the baffle plate 4AL of the housing portion 4L from the inside of the housing portion 4L and reaches the vicinity of the listener's ear canal entrance 102L. In practice, the electroacoustic transducer 2L operates as a bass-reflex speaker as a whole by causing the tubular duct 8L to act as a bass-reflex duct.

  By the way, in a general bass reflex type speaker, the duct is provided only inside the casing and does not extend to the outside. Therefore, for comparison with the electroacoustic conversion unit 2L, an electroacoustic conversion unit 12L as shown in FIG. 6 in which the same reference numerals are assigned to the corresponding parts in FIG. 5 is assumed.

  This electroacoustic conversion part 12L (FIG. 6) is configured in the same manner as a general bass reflex type speaker, and instead of the tubular duct 8L (FIG. 5) of the electroacoustic conversion part 2L, only the inside of the housing part 4L. Have two tubular ducts 18L and 19L.

  In the case of this electroacoustic conversion unit 12L, medium and high sounds radiated from the speaker unit 7L when the position of the speaker unit 7L is regarded as a virtual sound source position (hereinafter referred to as a virtual sound source position) PM. Is radiated from the holes 18AL and 19AL through the tubular ducts 18L and 19L when the path length EM until the listener reaches the eardrum 103L of the listener and the holes 18AL and 19AL are regarded as the virtual sound source position PL2. When the path length EL2 until the bass reaches the eardrum 103L of the listener is compared, the path length EM≈path length EL2.

  Here, the frequency characteristics of the sound that reaches the eardrum 103L by the electroacoustic transducer 12L are shown in FIG. As shown in FIG. 7, the general bass-reflex type electroacoustic transducer 12L includes medium and high sounds radiated from the speaker unit 7L and having a frequency characteristic as shown by the characteristic curve SM, and inside and 19L of the tubular duct 18L. The low-frequency sound having a frequency characteristic as shown in the characteristic curve SL2 radiated from the holes 18AL and 19AL through the inside is combined to reach the eardrum 103L of the listener.

  As a result, the electroacoustic conversion unit 12L causes the listener to listen to the reproduced sound in which the sound pressure level in the low frequency range of the characteristic curve SM is increased to some extent, as indicated by the characteristic curve SG2 obtained by synthesizing the characteristic curve SM and the characteristic curve SL2. be able to.

  On the other hand, in the electroacoustic transducer 2L (FIG. 5) according to the present invention, when the speaker unit 7L is regarded as the virtual sound source position PM, the middle and high sounds emitted from the speaker unit 7L reach the eardrum 103L of the listener. The path length EM and the path length EL1 until the bass radiated from the hole 8AL through the tubular duct 8L reaches the listener's eardrum 103L when the hole 8AL is regarded as the virtual sound source position PL1. In comparison, path length EM> path length EL1.

  Here, the frequency characteristics of the sound that reaches the eardrum 103L by the electroacoustic transducer 2L are shown in FIG. Since the electroacoustic conversion unit 2L is a kind of bass reflex type speaker as described above, the medium and high sound having the frequency characteristic shown in the characteristic curve SM radiated from the speaker unit 7L is the same as the case shown in FIG. Then, the low frequency sound having the frequency characteristic shown in the characteristic curve SL1 radiated from the hole 8AL through the tubular duct 8L is combined to reach the eardrum 103L of the listener.

  By the way, in general, the distance from the sound source and the sound pressure level are in an inversely proportional relationship. Here, when the path lengths of the electroacoustic conversion unit 2L (FIG. 5) and the electroacoustic conversion unit 12L (FIG. 6) are compared, the relationship of path length EL1 <path length EL2 is established.

  That is, in the electroacoustic transducer 2L (FIG. 5), the virtual sound source position PL1 is located closer to the listener's ear canal entrance 102L than the virtual sound source position PL2 of the electroacoustic transducer 12L (FIG. 6). The bass sound radiated from the hole 8AL (virtual sound source position PL1) can reach the eardrum 103L at a higher sound pressure level than in the electroacoustic transducer 12L.

  That is, as shown in FIG. 9 in which the two characteristic curves SL1 and SL2 are overlapped, the bass characteristic curve SL1 due to the tubular duct 8L has a bass characteristic due to the tubular ducts 18L and 19L due to the relationship of path length EL1 <path length EL2. The overall sound pressure level is higher than that of the curve SL2.

  As a result, the electroacoustic conversion unit 2L according to the first embodiment performs electroacoustic conversion with the sound pressure level in the low frequency range of the characteristic curve SM as indicated by the characteristic curve SG1 obtained by synthesizing the characteristic curve SM and the characteristic curve SL1. The listener can listen to the reproduced sound having a sufficient sound pressure level up to a relatively low frequency band, which is higher than in the case of the section 12L (characteristic curve SG2).

  Here, when the characteristic curve SG1 is compared with the characteristic curve SG2, the sound pressure level in the characteristic curve SG2 decreases relatively steeply as it goes to the low frequency range, whereas in the characteristic curve SG1, the low frequency range side. It can be seen that the degree of decrease in the sound pressure level becomes milder as the operation proceeds.

  That is, the electroacoustic conversion unit 2L transmits a good reproduction sound having a high sound pressure level over a wide frequency band, that is, including a sufficient low frequency range, to the listener's eardrum 103 as compared with the electroacoustic conversion unit 12L. And can be heard.

  In this case, as shown in FIGS. 4 and 5, the electroacoustic transducer 2L positions the outer end portion of the tubular duct 8L in the vicinity of the listener's ear canal entrance 102L, but completely blocks the ear canal entrance 102L. do not do.

  For this reason, the electroacoustic conversion unit 2L has a sound generated around the listener (hereinafter referred to as a surrounding sound) in addition to a reproduction sound that is a combination of a medium / high sound radiated from the speaker unit 7L and a low sound radiated from the hole 8AL of the tubular duct 8L. The sound reaches the eardrum 103L of the listener without being cut off.

  Incidentally, in the electroacoustic transducer 2L, the inner volume of the housing 4L is 10 [ml], the outer diameter of the speaker unit 7L is 21 [mm], and the effective vibration radius of the diaphragm of the speaker unit 7L is 8.5 [mm]. ], The equivalent mass of the vibration system is 0.2 [g], the lowest resonance frequency f0 is 360 [Hz], and the resonance Q0 is 1.0.

  The tubular duct 8L has an inner diameter of 1.8 [mm], an effective length of 50 [mm] from the inner end 8BL located in the casing 4L of the tubular duct 8L to the hole 8AL, and the surface of the baffle plate 4AL. The distance from the hole 8AL to the hole 8AL is about 35 [mm].

  Here, the tubular duct 8L has a U-shaped side surface and is provided with a hole 8AL in the center of the outer end, so that it substantially constitutes two bass reflex ducts having an upper half and a lower half. In consideration of the inner diameter (corresponding to about 2.5 [mm] in this case) when the tubular duct 8L is converted into one tubular duct, the inner diameter and the effective The length has been determined.

  That is, the tubular duct 8L is formed in a U-shape on the side surface, so that the effective length can be set shorter than in the case of a single tubular duct, and the design and safety can be greatly improved. Has been made.

  With respect to the electroacoustic transducer 2L (FIG. 5) and the electroacoustic transducer 12L (FIG. 6), the actual frequency characteristics were measured using a measuring jig simulating the human pinna and the external auditory canal. A characteristic curve SG11 (in the case of the electroacoustic conversion unit 2L) and a characteristic curve SG12 (in the case of the electroacoustic conversion unit 12L) as shown are obtained.

  In FIG. 10, the characteristic curve SG11 of the electroacoustic conversion unit 2L is more than the characteristic curve SG12 of the electroacoustic conversion unit 12L in the low frequency range of about 500 [Hz] or less, like the theoretical frequency characteristic shown in FIG. The sound pressure level is high. That is, it is shown that the electroacoustic conversion unit 2L can actually listen to a good reproduced sound including a sufficient bass for the listener.

  As described above, when the ear speaker device 1 is attached to the listener's head 100, the speaker unit 7L is positioned at a position slightly away from the listener's ear canal entrance 102L, and the speaker unit 7L emits medium and high-pitched sounds. In addition, the bass sound of the reproduced sound is radiated from the hole 8AL of the tubular duct 8L that is extended from the housing part 4L to the vicinity of the external ear canal entrance 102L and acts as a bass reflex duct, thereby providing a sufficiently low sound while providing a natural sound image localization. The listener can listen to a good reproduction sound including

  Note that the casing units 4L and 4R (FIGS. 1 and 2) of the above-described ear speaker device 1 are on the same plane as the speaker units 7L and 7R provided on the baffle plates 4AL and 4AR, and the speaker units thereof. Microphones MF1L and MF1R for binaural recording that are omnidirectional are attached at positions adjacent to 7L and 7R.

  Here, binaural recording is a recording method in which sound is recorded while being influenced by the head-related transfer function by two microphones attached to the actual ears of a dummy head or a listener.

  In this binaural recording, when the recorded sound is reproduced and output by the speaker units 7L and 7R of the ear speaker device 1, the left and right sounds heard with the dummy head or the actual ears of the listener are not mixed, and the listener's sound is reproduced as it is. In order to reach the ear, it is possible to obtain a sense of presence as if the listener himself was present.

  That is, in binaural recording, it is possible to realize ideal sound image localization because recording can be performed as if the listener is actually listening to the sound from the sound source.

  Therefore, in the ear speaker device 1, the reproduced sound of the binaurally recorded audio content is output from the speaker units 7L and 7R, so that natural sound image localization is provided and the holes 8AL and 8AR of the tubular ducts 8L and 8R are sufficiently provided. Therefore, it is possible to make the listener listen to a good reproduction sound including a low tone.

  Incidentally, the mounting positions of the microphones MF1L and MF1R are not limited to this place, and as long as they are in the vicinity of the speaker units 7L and 7R as long as they are non-directional, for example, on the same plane as the speaker units 7L and 7R. It may be a predetermined position on the surface of the casings 4L and 4R.

  Also, in the ear speaker device 1, the microphones MF1L and MF1R for binaural recording are not newly provided, but the microphones for noise cancellation attached at the same position are used as the microphones MF1L and MF1R for binaural recording by mode switching. It may be.

  Furthermore, in the ear speaker device 1, the microphone units MF1L and MF1R for binaural recording may not be newly provided, but the speaker units 7L and 7R may be used as the microphones MF1L and MF1R for binaural recording by mode switching.

(1-2) Configuration Example of Other Ear Speaker Device By the way, as shown in FIGS. 1 to 4, the ear speaker device 1 according to the first embodiment includes an electroacoustic conversion unit by a band unit 3 as a mounting unit. 2L and 2R are attached to the listener's head 100, but the electroacoustic transducers 2L and 2R can be attached to the listener's head 100 by using various other attachments instead of the band 3. You may make it wear.

  In the following, as in the case of the ear speaker device 1 described above, the left electroacoustic transducer 2L will be mainly described as an example. However, for the right electroacoustic transducer 2R, the left electroacoustic transducer 2L. And symmetrically configured.

  For example, the ear speaker device 20 shown in FIG. 11 is configured as a so-called ear clip type, and instead of the band portion 3 in the ear speaker device 1 (FIGS. 1 to 4), an ear for hooking on the listener's pinna 101L. A clip 21L is attached to the casing 4L of the electroacoustic transducer 2L.

  The ear speaker device 20 can attach the electroacoustic conversion unit 2L to the listener's head 100 by hooking the ear clip 21L to the listener's pinna 101L, and, like the ear speaker device 1, natural sound image localization is possible. In this way, the listener can listen to a good reproduction sound including a sufficient bass sound.

  Further, the ear speaker device 30 shown in FIG. 12 is configured as a so-called under-chin type, and instead of the band portion 3 in the ear speaker device 1 (FIGS. 1 to 4), left and right electroacoustic transducers 2L and 2R are provided. A band 31 for connecting and hooking on the listener's pinna 101L is attached to the housing 4L. The central portion 31A of the band portion 31 is formed in a substantially convex downward arch shape, and is assumed to pass under the listener's jaw and to the left and right.

  This ear speaker device 30 (FIG. 12) can attach the electroacoustic transducer 2L to the listener's head 100 by hooking the ear hook 31BL of the band 31 to the listener's pinna 101L. Similar to the device 1, the listener can listen to a good reproduction sound including a sufficient bass while giving a natural sound image localization.

  Further, the ear speaker device 40 shown in FIG. 13 is configured as a so-called shoulder hold type, and instead of the band portion 3 in the ear speaker device 1 (FIGS. 1 to 4), left and right electroacoustic transducers 2L and 2R are provided. A shoulder arm 41 that is connected and supported from the shoulder portion of the listener is attached to the housing portion 4L. The center portion 41A of the shoulder arm 41 is formed in a substantially convex arch shape at the back, and is assumed to be hooked from the back of the listener's neck to the upper portion of the shoulder and passed to the left and right.

  The ear speaker device 40 (FIG. 13) can be attached to the listener's head 100 by being hooked over both shoulders of the listener, and, like the ear speaker device 1, a natural sound image can be mounted. The listener can listen to a good reproduction sound including a sufficient bass while giving a localization.

  Further, the ear speaker device 50 shown in FIG. 14 is configured as a so-called neckband type, and instead of the band portion 3 in the ear speaker device 1 (FIGS. 1 to 4), left and right electroacoustic transducers 2L and 2R are provided. A band 51 for connecting and hanging on the listener's pinna 101L is attached to the housing 4L. The central portion 51A of the band portion 51 is formed on the assumption that it is formed in a substantially convex arch shape on the back and is passed on the back side of the rear head of the listener.

  This ear speaker device 50 (FIG. 14) can attach the electroacoustic transducer 2L to the listener's head 100 by hooking the ear hook 51BL of the band 51 to the listener's pinna 101L. Similar to the device 1, the listener can listen to a good reproduction sound including a sufficient bass while giving a natural sound image localization.

  Further, the ear speaker device 60 shown in FIG. 15 positions the electroacoustic transducer 2L in the ear speaker device 50 shown in FIG. 14 behind the listener's pinna 101 and is substantially L-shaped instead of the tubular duct 8L. A tubular duct 68L is extended from the housing portion 4L located behind the listener's pinna 101L to the vicinity of the ear canal entrance 102L. The left and right electroacoustic transducers 2L and 2R are connected to each other by a band 61 that is passed on the back side of the listener's neck.

  In the ear speaker device 60 (FIG. 15), the electroacoustic transducer 2L can be mounted on the listener's head 100 by hooking the tubular duct 68L to the listener's pinna 101L. The listener can listen to a good reproduction sound including a sufficient bass while giving a natural sound image localization.

  Further, the ear speaker device 70 shown in FIG. 16 has a rear electroacoustic transducer 72L having the same configuration as the electroacoustic transducer 12L (FIG. 6) in addition to the electroacoustic transducer 2L. The band unit 71 instead of the band unit 3 in the speaker device 1 (FIGS. 1 to 4) positions the electroacoustic conversion unit 2L in front of the auricle 101L and the rear electroacoustic conversion unit 72L behind the auricle 101L. It is made to be located in.

  Incidentally, the rear electroacoustic converter 72L is supplied with an audio signal for a rear channel in a multichannel sound source such as a 4-channel or 5.1-channel sound source.

  The ear speaker device 70 (FIG. 16) is attached to the listener's head 100, whereby the electroacoustic transducer 2L and the rear electroacoustic transducer 72L can be attached to the listener's head 100. With the auricle 101L sandwiched between the acoustic conversion unit 2L and the rear electroacoustic conversion unit 72L, the listener listens to a good reproduction sound that is a surround sound and includes a sufficient bass while giving a natural sound image localization. Has been made to get.

  Further, in this case, in the ear speaker device 70 (FIG. 16), a vibrator 75 is attached to the band portion 71, and for example, vibration corresponding to a heavy bass component in a 5.1 channel sound source is applied to the listener's head 100. Also good.

  The ear speaker device 70 (FIG. 16) is not limited to extending the tubular duct 8L from the electroacoustic converter 2L to the vicinity of the listener's external auditory canal entrance 102L, and is similar to the ear speaker device 60 (FIG. 15). The tubular duct extends from the portion 72L to the vicinity of the listener's ear canal entrance 102L, or the tubular duct extends from both the electroacoustic transducer 2L and the rear electroacoustic transducer 72L to the listener's ear canal entrance 102L. May be.

  Further, the ear speaker device 80 shown in FIG. 17 is connected to the left and right electroacoustic transducers 2L and 2R instead of the band portion 3 in the ear speaker device 1 (FIGS. 1 to 4), and in front of the listener's cheek. A band portion 81 for positioning is attached to the housing portion 4L.

  The casing 4L is provided with a tubular duct 88L extending from the casing 4L to the vicinity of the listener's ear canal entrance 102L instead of the tubular duct 8L. The tubular duct 88L is appropriately calculated for its inner diameter, sound path length, and the like in order to radiate a good bass sound in the reproduced sound from the hole 88AL.

  The ear speaker device 80 (FIG. 17) can be positioned on the front side of the listener's cheek by being mounted on the listener's head 100. In this case, since the characteristics of the medium and high sounds radiated from the speaker unit 7L are reflected by being reflected by the listener's cheeks or the like, compared to the case of the ear speaker device 1, a general stationary speaker is used. It will be closer to the sound radiated from. Thereby, the ear speaker device 80 can make the listener listen to the reproduced sound that can give a more natural feeling of localization.

  As described above, in the present invention, in addition to the band portion 3 (FIGS. 1 to 4) of the ear speaker device 1, the mounting portions having various methods such as the ear speaker devices 20 to 80 (FIGS. 11 to 17) are used. The electroacoustic transducers 2L and 2R may be attached to the listener's head 100.

(1-3) Operation and effect in the first embodiment In the above configuration, the ear speaker device 1 is provided on the housing 4L of the electroacoustic transducer 2L by being mounted on the head 100 of the listener. The speaker unit 7L is positioned slightly forward of the listener's ear canal entrance 102L, and the distal end portion of the tubular duct 8L extending rearward from the housing 4L and acting as a bass reflex duct is positioned in the vicinity of the ear canal entrance 102L. In this state, a reproduction sound based on an audio signal supplied from a predetermined amplifier is output.

  At this time, in the electroacoustic transducer 2L (FIG. 5) of the ear speaker device 1, the hole 8AL of the tubular duct 8L is longer than the path length EM until the middle and high sounds radiated from the speaker unit 7L reach the eardrum 103L of the listener. Since the path length EL1 until the bass radiated from the sound reaches the eardrum 103L is shortened, the middle to high tone as shown in the characteristic curve SM (FIG. 7) is relatively low as shown in the characteristic curve SL1. A bass having a high sound pressure level can reach the eardrum 103L.

  Therefore, since the electroacoustic conversion unit 2L of the ear speaker device 1 can reflect the middle and high sounds radiated from the speaker unit 7L by the listener's cheeks, the auricles 101L and the like to reach the eardrum 103L, a general speaker Thus, the listener can listen to the reproduced sound having characteristics similar to those of listening to the reproduced sound through the sound, and a natural localization feeling that the sound image is located outside the head can be given.

  Further, the electroacoustic transducer 2L of the ear speaker device 1 is shown in the characteristic curve SG1 (FIG. 9) and the characteristic curve SG11 (FIG. 10) by extending the tubular duct 8L to the vicinity of the listener's ear canal entrance 102L. In addition, it is possible to make the listener listen to a good reproduced sound having a relatively sufficient sound pressure level up to the low sound range.

  In this case, in the electroacoustic transducer 2L of the ear speaker device 1, the tubular duct 8L is extended to the vicinity of the listener's external auditory canal entrance 102L. Therefore, in the general bass reflex electroacoustic transducer 2L (FIG. 6), It is possible to cause a bass having a large sound pressure level such as the characteristic curve SL1 (FIG. 7) to reach the eardrum 103L of the listener as compared to a bass like the characteristic curve SL2 (FIG. 7) output from the ducts 18L and 19L. As a result, it is possible to allow the listener to listen to the bass sound that is likely to be insufficient due to the relatively small diameter of the speaker unit 7L and being slightly away from the ear canal entrance 102L at a sufficient sound pressure level.

  Furthermore, the ear speaker device 1 does not increase the reproduction volume of the bass sound, but makes the listener's eardrum 103L (FIG. 5) sufficiently low by bringing the hole 8AL of the tubular duct 8L, which is a low-frequency emission port, close to the eardrum 103L. Therefore, compared to the case where bass is reproduced using, for example, a large-diameter speaker or subwoofer, the bass and vibration leaking to the surroundings can be substantially eliminated.

  Therefore, for example, when the listener listens to the reproduced sound through the ear speaker device 1 at midnight, the user can enjoy a satisfactory reproduced sound including a sufficient low sound without worrying about inconvenience to the vicinity and surroundings. be able to.

  Further, since the tubular duct 8L does not block the listener's ear canal entrance 102L, it is possible to reach the eardrum 103L and listen to the reproduced sound and the surrounding sound generated around the listener without being blocked.

  Thereby, in the ear speaker device 1, when the listener needs to listen to the ambient sound, such as when the listener walks or plays sports, it is possible to reliably hear the ambient sound in addition to the good reproduction sound. it can.

  In addition, the ear speaker device 1 does not cover the listener's pinna 101L and the like with the electroacoustic conversion unit 2L unlike the conventional sealed headphones, so that the listener feels like a listener wearing the sealed headphones. There is no unpleasant sensation of heat and stuffiness. Furthermore, since the ear speaker device 1 does not form a sealed space, the resonance frequency in the ear canal, which may occur when sealed headphones are used, does not occur, and the listener does not feel uncomfortable.

  In addition, since the ear speaker device 1 allows the listener to listen to a low sound of a sufficient volume level by bringing the hole 8AL of the tubular duct 8L, which is a low-frequency radiation port, close to the eardrum 103L, the diameter of the speaker unit 7L is unnecessary. There is no need to increase the size, and the size of the housing 4L can be minimized. As a result, in the ear speaker device 1, the overall size and weight can be minimized, so that troublesomeness due to the size and weight when the listener wears the ear speaker device 1 can be minimized.

  According to the above configuration, when the ear speaker device 1 is attached to the listener's head 100, the speaker unit 7L of the electroacoustic transducer 2L is positioned slightly forward of the listener's ear canal entrance 102L and is tubular. The reproduced sound is output in a state where the hole 8AL of the duct 8L is positioned in the vicinity of the ear canal entrance 102L, so that the bass radiated from the hole 8AL of the tubular duct 8L acting as a bass reflex duct can be heard at a sufficient sound pressure level. Therefore, it is possible to make the listener listen to a good reproduction sound having a sufficient sound pressure level up to a relatively low sound range while giving a natural sound image localization.

(1-4) Other Embodiments to the First Embodiment In the above-described first embodiment, the tubular duct 8L is formed in a substantially U-shaped side surface, and two are formed with the hole 8AL as a boundary. However, the present invention is not limited to this, and the tubular duct 8L may be constituted by one or three or more tubular ducts.

  For example, as shown in FIG. 18, in the electroacoustic transducer 92L of the ear speaker device 90, one tubular duct 98L functioning as a bass reflex duct may be extended rearward from the housing 4L. A protective part 99L for preventing damage to the listener's ear canal entrance 102L may be attached to the distal end of the tubular duct 98L. In this case, the protection unit 99L is configured by a sponge-like member or the like through which sound can easily pass, so that the listener can listen to the sound without blocking ambient sounds.

  In the first embodiment, the case where the tubular duct 8L formed of a hard material such as metal is used has been described. However, the present invention is not limited to this, and a soft resin such as a flexible resin is used. A tubular duct 8L formed of a material may be used.

  Furthermore, in 1st Embodiment, although the case where the tubular duct 8L was provided so that it might penetrate the baffle board 4AL of the housing | casing part 4L was described, this invention is not limited to this, The said tubular duct 8L is the said You may provide so that the other side in 4 L of housing | casing parts may be penetrated.

  Further, in the first embodiment, the case where the sound emitting surface of the speaker unit 7L is directed substantially rearward when the ear speaker device 1 is attached to the listener's head 100 (FIG. 4) has been described. However, the present invention is not limited to this. For example, the sound emitting surface of the speaker unit 7L may be directed slightly inward. In short, the sound emitting surface of the speaker unit 7L is directed substantially in the direction of the ear canal entrance 102L. It is only necessary that the medium and high sounds to be reached efficiently reach the eardrum 103L.

  Further, in the first embodiment, the case where the ear speaker device 1 has the left and right electroacoustic converters 2L and 2R and outputs the reproduced sound of two channels has been described. For example, only the left electroacoustic converter 2L may be provided to output one channel of reproduced sound.

  Furthermore, in the first embodiment, the case where the loudspeaker unit 7L for middle and high sounds is provided in the housing 4L has been described. However, the present invention is not limited to this, and for example, two for medium sounds and high sounds. A plurality of speaker units may be provided in the housing part 4L, such as providing two speaker units in one housing part 4L to form a 2-way speaker.

  Further, in the first embodiment, the case has been described in which the casing portion 4L having a shape obtained by dividing the sphere into four equal parts in the vertical direction is used. However, the present invention is not limited to this. Various shapes such as a cylindrical shape and a cylindrical shape may be used. In short, it is only necessary to have a substantially sealed space inside that can function as an enclosure for a bass reflex type speaker.

  Further, in the first embodiment, the case has been described in which the casing portion 4L in which the edge is left at the end portion of the inner end portion 8BL of the tubular duct 8L (FIG. 5) is used. However, the present invention is not limited to this, and a housing portion 4L in which an R-shaped round shape is formed on the end portion of the inner end portion 8BL of the tubular duct 8L may be used. In this case, in the housing portion 4L, the air pushed out from the back side of the speaker unit 7L does not hit the edge to generate a wind noise, and only the low sound without noise is radiated from the hole portion 8AL of the tubular duct 8L. can do.

  Furthermore, in the first embodiment, the case where the tubular ducts 8L and 8R are integrally attached to the housing portions 4L and 4R has been described. However, the present invention is not limited to this, and the attachment and It is good also as a structure which can be removed.

  For example, as shown in FIG. 19 in which the same reference numerals are assigned to the corresponding parts as in FIG. 5, in the housing part 4L1, the concave duct holding part 4L2 formed on the baffle plate 4AL of the housing part 4L1 The tubular duct 8L1 can be removed by fitting by fitting the duct fitting portion 8L2 of the tubular duct 8L1 and eliminating the fitting state between the duct holding portion 4L2 and the duct fitting portion 8L2.

  Furthermore, in the first embodiment, the case where the tubular duct 8L in which the duct length from the hole 8AL to the inner end 8BL is set to the same length is used has been described. Not limited to this, tubular ducts having different duct lengths may be used.

  For example, as shown in FIG. 20 where parts corresponding to those in FIG. 4 are given the same reference numerals, a length L1 from the hole 8AL to the inner end 8BL1, and a length L2 from the hole 8AL to the inner end 8BL2 In the casing portion 4L3 provided with the tubular duct 8L3 having different lengths, a phase shift of the resonance characteristics occurs between the duct portion having the length L1 and the duct portion having the length L2, and as a result, the output is slightly output from the hole portion 8AL. The frequency components in the middle and high range are canceled out, and only the low tone in which the middle and high tone is canceled can be radiated from the hole 8AL of the tubular duct 8L3.

  Further, in the first embodiment, the case where the microphones MF1L and MF1R are used as binaural recording microphones has been described. However, the present invention is not limited to this, and the microphones for realizing a noise canceling function can also be used. You may make it also use.

  In this case, the ear speaker device 1 collects external noise by the microphones MF1L and MF1R when the reproduced sound is heard by the listener, and generates and outputs a sound having a phase opposite to that of the external noise. Only the playback sound can be heard.

  Further, in the first embodiment, the housing parts 4L and 4R as the housing parts, the speaker units 7L and 7R as the speaker units, the tubular ducts 8L and 8R as the tubular ducts, and the binaural recording microphone Although the case where the electroacoustic transducers 2L and 2R as electroacoustic transducers are configured by the microphones MF1L and MF1R as described above is described, the present invention is not limited to this, and the casing unit having other various configurations The electroacoustic transducer may be configured by a speaker unit, a tubular duct, and a binaural recording microphone.

  Furthermore, in the first embodiment, the housing portions 4L and 4R as the housing portions, the speaker units 7L and 7R as the speaker units, the band portion 3 as the mounting portion, and the tubular duct 8L as the tubular duct. And 8R and microphones MF1L and MF1R as binaural recording microphones have been described as constituting the ear speaker device 1 as the ear speaker device. However, the present invention is not limited to this, and the housing having various other configurations. You may make it comprise an ear speaker apparatus with a body part, a speaker unit, a mounting part, a tubular duct, and a microphone for binaural recording.

(2) Second Embodiment (2-1) Configuration of Ear Speaker Device In FIGS. 21 and 22 in which the same reference numerals are assigned to the corresponding parts to those in FIG. 1, 200 is the ear in the second embodiment as a whole. A speaker device is shown, which converts an audio signal generated by a portable CD player or DMP playback process into a playback sound and listens to the listener.

  In the ear speaker device 200, unlike a normal box-type speaker device, it is assumed that the ear speaker device 200 is attached to the head of a listener as in a normal headphone device. The electroacoustic conversion units 202L and 202R to be converted and the band unit 3 for mounting and fixing the electroacoustic conversion units 202L and 202R on the head of the listener.

  The electroacoustic transducers 202L and 202R are mainly configured by casing parts 204L and 204R each having a substantially spherical shape, and the casing parts 204L and 204R are provided with speaker units 207L and 207R, respectively. It has been.

  The housing part 204L (FIG. 22) is divided into a hemispherical part 204LA located on the front side and a cover part 204LB located on the rear side with the speaker unit 207L as a boundary. A speaker unit 207L that converts an audio signal into reproduced sound is attached to the baffle plate 204AL.

  The speaker unit 207L mainly emits middle and high sounds by vibrating the diaphragm in accordance with an audio signal supplied from a portable CD player, DMP, or the like via the connection cable 6.

  The cover portion 204LB (FIG. 22) has a hemispherical shape having a space inside, covers the front space of the baffle plate 204AL, and is made of metal with respect to the approximate center of the surface and has a predetermined thickness. A tubular duct 208 </ b> L is attached to which the member is bent into a substantially U-shaped side surface.

  The tubular ducts 208L and 208R (FIG. 21) have their outer ends bent inwardly in the left and right directions, and further have holes 208AL and 208AR formed at substantially the center of the outer ends.

  The band portion 3 is formed in an approximately arch shape convex upward in accordance with the shape of a general human head centering on the central portion 3A, and slides freely in relation to the central portion 3A. The length of the entire band unit 3 can be adjusted by the adjustment units 3BL and 3BR to be obtained.

  Further, the band portion 3 is formed in an arch shape having a diameter smaller than that of a general human head and has an elastic force. When the band portion 3 is attached to a listener, the housing portions 204L and 204R are left and right. When mounted while being spread, the casings 204L and 204R are held in contact with the listener's head in order to return to the original shape by the action of the elastic force after mounting. Has been made.

  In addition, since the ear speaker device 200 is configured substantially symmetrically, the following description will be mainly given of the left electroacoustic conversion unit 202L as an example.

  In practice, the ear speaker device 200 (FIG. 22) is electroacoustic conversion attached to the lower end side of the adjusting portion 3BL by being attached to the listener's head 100 after the length of the band portion 3 is adjusted. The portion 202L is positioned slightly ahead of the auricle 101L in the listener's head.

  Accordingly, in the ear speaker device 200, when the speaker unit 207L of the housing unit 204L is normally attached to the listener via the band unit 3, the speaker unit 207L of the housing unit 204L is positioned slightly in front of the auricle 101L and the ear canal entrance 102L, and the cover unit 204LB. The hole 208AL of the tubular duct 208L is positioned in the vicinity of the ear canal entrance 102L.

  Therefore, the ear speaker device 200 can cause mainly middle and high sounds radiated from the speaker unit 207L to directly reach the inside of the ear canal of the listener via the cover portion 204LB and the tubular duct 208L. Therefore, it is possible to give a natural sound image localization in a state where there is no middle and high sound leakage as compared with the case where the sound is heard through.

  Incidentally, the tubular duct 208L is formed so that its distal end portion is formed in a substantially U-shaped side surface, so that it does not enter the ear canal of the listener. As a result, the ear speaker device 200 can prevent the listener from accidentally damaging the inside of the ear canal by the distal end portion of the tubular duct 208L when the listener is worn.

  Here, as shown in FIG. 23, the Q3-Q4 cross section in FIG. 22 is such that the housing 204L of the electroacoustic transducer 202L is sealed in the front space of the speaker unit 207L except for the hole 208AL of the tubular duct 208L. A resonance circuit is formed by the cover portion 204LB and the tubular duct 208L with respect to the speaker unit 207L.

  The tubular duct 208L reaches the vicinity of the listener's ear canal entrance 102L from the inside of the housing portion 204L via the cover portion 204LB of the housing portion 204L. In practice, the electroacoustic transducer 202L mainly collects middle and high sounds radiated from the front surface of the speaker unit 207L via the cover 204LB and the tubular duct 208L, and the listener's tympanic membrane 103 from the hole 208AL of the tubular duct 208L. By allowing the sound to reach directly, the listener can listen to medium and high sounds with a sufficient sound level with little sound leakage.

  The tubular duct 208L is formed to have a substantially U-shaped side surface, so that the effective length can be set shorter than in the case of a single tubular duct, and the design and safety can be greatly improved. Has been made.

  Note that the casings 204L and 204R (FIGS. 21 and 22) of the ear speaker device 200 described above are non-directional at positions on the surfaces of the cover parts 204LB and 204RB and facing the speaker units 207L and 207R. The binaural recording microphones MF2L and MF2R are attached.

  In this binaural recording, when the recorded sound is reproduced and output by the speaker units 207L and 207R of the ear speaker device 200, the left and right sounds heard with the dummy head or the actual ears of the listener are not mixed, and the listener's sound is exactly the same. In order to reach the ear, it is possible to obtain a sense of presence as if the listener himself was present.

  That is, in binaural recording, it is possible to realize ideal sound image localization because recording can be performed as if the listener is actually listening to the sound from the sound source.

  Therefore, in the ear speaker device 200, the reproduction sound of the binaurally recorded audio content is output from the speaker units 207L and 207R through the tubular ducts 208L and 208R, so that natural sound image localization is given and the holes of the tubular ducts 208L and 208R are provided. Through the sections 208AL and 208AR, it is possible to allow the listener to listen to medium and high-pitched reproduced sound without sound leakage.

  Incidentally, the attachment positions of the microphones MF2L and MF2R are not limited to this place, and as long as they are non-directional, predetermined positions on the surfaces of the cover parts 204LB and 204RB and on the surfaces of the hemispherical parts 204LA and 204RA. It may be.

  In the ear speaker device 200, the microphones MF2L and MF2R for binaural recording are not newly provided, but the microphones for noise cancellation attached at the same position are used as the microphones MF2L and MF2R for binaural recording by mode switching. It may be.

  Further, in the ear speaker device 200, instead of newly providing the binaural recording microphones MF2L and MF2R, the speaker units 207L and 207R may be used as the binaural recording microphones MF2L and MF2R by mode switching.

(2-2) Configuration Example of Other Ear Speaker Device By the way, as shown in FIGS. 21 to 23, the ear speaker device 200 according to the second embodiment performs electroacoustic conversion by the band portion 3 as a mounting portion. The parts 202L and 202R are attached to the listener's head 100. However, the electroacoustic converters 202L and 202R can be attached to the listener's head 100 by using other various attachment parts instead of the band part 3. You may make it attach to.

  Hereinafter, as in the case of the ear speaker device 200 described above, the left electroacoustic conversion unit 202L will be mainly described as an example. However, the left electroacoustic conversion unit 202R also applies to the left electroacoustic conversion unit 202L. And symmetrically configured.

  For example, as shown in FIG. 24 in which parts corresponding to those in FIG. 11 are denoted by the same reference numerals, the ear clip 21L for hooking on the listener's pinna 101L is the ear speaker device 200 in the second embodiment (FIGS. 21 to 21). Instead of the band part 3 of 23), a so-called ear clip type ear speaker device 220 attached to the housing part 204L of the electroacoustic conversion part 202L is conceivable.

  Also in the ear speaker device 220 (FIG. 24) in this case, mainly the middle and high sounds radiated from the speaker unit 207L can reach the inside of the ear canal of the listener directly through the cover portion 204LB and the tubular duct 208L. Natural sound image localization can be provided in a state where there is no middle-high sound leakage compared to when listening through a general stationary speaker.

  Also, as shown in FIG. 25 where the same reference numerals are assigned to the parts corresponding to FIG. 12, the left and right electroacoustic transducers 202L and 202R of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment are connected. In addition, a so-called under-chin type ear speaker device in which the band portion 31 for hooking on the listener's auricle 101L is attached to the housing portion 204L of the electroacoustic transducer 202L instead of the band portion 3 of the ear speaker device 200. 230 is conceivable.

  Also in the ear speaker device 230 (FIG. 25) in this case, mainly the middle and high sounds radiated from the speaker unit 207L can directly reach the inside of the ear canal of the listener via the cover portion 204LB and the tubular duct 208L. Natural sound image localization can be provided in a state where there is no middle-high sound leakage compared to when listening through a general stationary speaker.

  Further, as shown in FIG. 26 in which parts corresponding to those in FIG. 13 are assigned the same reference numerals, the left and right electroacoustic transducers 202L and 202R of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment are connected. In addition, a so-called shoulder-hold type ear speaker device 240 in which the shoulder arm 41 supported from the shoulder portion of the listener is attached to the housing portion 204L of the electroacoustic transducer 202L instead of the band portion 3 of the ear speaker device 200 is provided. Conceivable.

  Also in the ear speaker device 240 (FIG. 26) in this case, mainly middle and high sounds radiated from the speaker unit 207L can directly reach the inside of the ear canal of the listener via the cover portion 204LB and the tubular duct 208L. Natural sound image localization can be provided in a state where there is no middle-high sound leakage compared to when listening through a general stationary speaker.

  Further, as shown in FIG. 27 in which parts corresponding to those in FIG. 14 are denoted by the same reference numerals, the left and right electroacoustic transducers 202L and 202R of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment are connected. In addition, a so-called neckband type ear speaker device 250 in which the band portion 51 for hooking on the listener's auricle 101L is attached to the housing portion 204L instead of the band portion 3 of the ear speaker device 200 can be considered.

  Even in the ear speaker device 250 (FIG. 27) in this case, mainly the middle and high sounds radiated from the speaker unit 207L can directly reach the inside of the ear canal of the listener via the cover portion 204LB and the tubular duct 208L. Natural sound image localization can be provided in a state where there is no middle-high sound leakage compared to when listening through a general stationary speaker.

  Further, as shown in FIG. 28 in which parts corresponding to those in FIG. 15 are denoted by the same reference numerals, the electroacoustic transducer 202L of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment is replaced with the listener's auricle 101. The tubular duct 261L having a substantially L shape instead of the tubular duct 208L is extended from the housing portion 204L located behind the listener's pinna 101L to the vicinity of the ear canal entrance 102L. An ear speaker device 260 is conceivable.

  Also in the ear speaker device 260 (FIG. 28) in this case, mainly middle and high sounds radiated from the speaker unit 207L can be directly reached inside the ear canal of the listener through the cover portion 204LB and the tubular duct 261L. Natural sound image localization can be provided in a state where there is no middle-high sound leakage compared to when listening through a general stationary speaker.

  Further, as shown in FIG. 29 in which parts corresponding to those in FIG. 16 are given the same reference numerals, in addition to the electroacoustic conversion unit 202L of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment, the electric The rear electroacoustic conversion unit 272L having the same configuration as the acoustic conversion unit 202L is provided, and the electroacoustic conversion unit 202L is replaced by the band unit 71 instead of the band unit 3 in the ear speaker device 200 (FIGS. 21 to 23). While being positioned in front of the auricle 101L, the rear electroacoustic transducer 272L is positioned in the rear of the auricle 101L.

  Incidentally, the rear electroacoustic converter 272L is supplied with an audio signal for a rear channel in a multi-channel sound source such as a 4-channel or 5.1-channel sound source.

  This ear speaker device 270 (FIG. 29) can be attached to the listener's head 100 by attaching the electroacoustic transducer 202L and the rear electroacoustic transducer 272L to the listener's head 100. While giving a natural sound image localization with the auricle 101L sandwiched between the acoustic conversion unit 202L and the rear electroacoustic conversion unit 272L, the listener can listen to a good reproduction sound that is a surround sound and includes a sufficient bass. Has been made.

  In this case, in the ear speaker device 270 (FIG. 29), the vibrator 75 is attached to the band portion 71 so that vibration corresponding to the heavy bass component in the 5.1 channel sound source is applied to the listener's head 100, for example. Anyway.

  In addition, the ear speaker device 270 (FIG. 29) is similar to the ear speaker device 260 (FIG. 28) except that the tubular duct 208L extends from the electroacoustic converter 202L to the vicinity of the listener's ear canal entrance 102L. The tubular duct extends from the portion 272L to the vicinity of the listener's ear canal entrance 102L, or the tubular duct extends from both the electroacoustic transducer 202L and the rear electroacoustic transducer 272L to the listener's ear canal entrance 102L. May be.

  Further, as shown in FIG. 30, in which parts corresponding to those in FIG. 17 are denoted by the same reference numerals, the electroacoustic conversion unit 202L of the ear speaker device 200 (FIGS. 21 to 23) in the second embodiment is arranged more than the cheek of the listener. An ear speaker device 280 in which a band portion 81 positioned on the front side is attached to the housing portion 204L is conceivable.

  The casing 204L is provided with a tubular duct 281L extending from the casing 204L to the vicinity of the listener's ear canal entrance 102L instead of the tubular duct 208L. The tubular duct 281L is appropriately calculated for its inner diameter, sound path length, and the like in order to radiate a good bass sound in the reproduced sound from the hole 281AL.

  The ear speaker device 280 (FIG. 30) can be positioned on the front side of the cheek of the listener by attaching the ear speaker device 280 (FIG. 30) to the head 100 of the listener. In this case, since the characteristics of the medium and high sounds radiated from the speaker unit 207L are reflected on the cheek of the listener and the like, the characteristics of the medium and high sounds change compared to the case of the ear speaker device 200. It will be closer to the sound radiated from. As a result, the ear speaker device 280 can make the listener listen to the reproduced sound that can give a more natural feeling of localization.

  As described above, according to the present invention, in addition to the band portion 3 (FIGS. 21 to 23) of the ear speaker device 200, the mounting portions having various methods such as the ear speaker devices 220 to 280 (FIGS. 24 to 30) are used. The electroacoustic transducers 202L and 202R may be attached to the listener's head 100.

(2-3) Operation and effect in the second embodiment In the above configuration, the ear speaker device 200 is provided in the housing 204L of the electroacoustic transducer 202L by being mounted on the head 100 of the listener. The medium and high sounds mainly emitted from the speaker unit 207L are collected from the cover part 204LB via the tubular duct 208L, and the middle and high sounds are output from the hole 208AL of the tubular duct 208L located in the vicinity of the ear canal entrance 102L.

  Accordingly, the electroacoustic conversion unit 202L of the ear speaker device 200 can cause the mid-high sound radiated from the speaker unit 207L to directly reach the eardrum 103L only from the hole 208AL of the tubular duct 208L. Thus, it is possible to listen to the reproduced sound having characteristics similar to those obtained when the listener listens to the sound without leakage, and to give a natural feeling of localization such that the sound image is located outside the head.

  The ear speaker device 200 only positions the hole 208AL of the tubular duct 208L in the vicinity of the ear canal entrance 102L, and does not block the ear canal entrance 102L like a sealed headphone. In addition to the reproduced sound output from the hole 208AL, the ambient sound can reach the eardrum 103 without being blocked, and thus the external ambient sound can be heard while listening to the reproduced sound through the tubular duct 208L. Can also be heard.

  Thereby, in the ear speaker device 200, when the listener needs to listen to the ambient sound, such as when the listener walks or plays sports, in addition to the reproduced sound output from the hole 208AL of the tubular duct 208L. Ambient sounds can be heard reliably.

  In addition, since the ear speaker device 200 does not cover the listener's pinna 101L and the like with the electroacoustic conversion unit 202L, the ear speaker device 200 gives an unpleasant feeling such as a feeling of obstruction and stuffiness that a listener wearing general headphones feels. There is no. Furthermore, since the ear speaker device 200 does not form a sealed space, there is no change in the resonance frequency in the ear canal, which may occur when sealed headphones are used, and the listener does not feel uncomfortable.

  In addition, since the ear speaker device 200 allows the listener to listen to medium and high sounds with a sufficient volume level by bringing the hole 208AL of the tubular duct 208L, which is the emission port of the reproduced sound, close to the eardrum 103L, the diameter of the speaker unit 207L is reduced. There is no need to make it as large as necessary, and the size of the housing portion 204L can be minimized.

  As a result, the size and weight of the entire ear speaker device 200 can be minimized, so that troublesomeness caused by the size and weight of the listener when the ear speaker device 200 is mounted can be minimized.

  According to the above configuration, when the ear speaker device 200 is attached to the listener's head 100, the speaker unit 207L of the electroacoustic transducer 202L is positioned slightly forward of the listener's ear canal entrance 102L and the speaker. Middle and high sounds mainly emitted from the unit 207L are collected from the cover part 204LB through the tubular duct 208L without leaking outside, and are reproduced based on the audio signal from the hole 208AL of the tubular duct 208L located near the ear canal entrance 102L. By outputting the sound, the medium and high sounds radiated from the hole 208AL of the tubular duct 208L can reach the eardrum 103 with a sufficient sound pressure level, so that the sound pressure level is sufficient while giving a natural sound image localization. A good reproduction sound can be heard by the listener.

(2-4) Other Embodiments to the Second Embodiment In the above-described second embodiment, the tubular duct 208L is formed in a substantially U-shaped side surface, and two pipes are formed with the hole 8AR as a boundary. However, the present invention is not limited to this, and the tubular duct 208L may be composed of one, three or more tubular ducts.

  For example, as shown in FIG. 31, in the electroacoustic transducer 292L of the ear speaker device 290, one tubular duct 298L may be extended backward from the surface of the cover 204LB in the housing 204L. Further, a protective portion 299L for preventing the listener's ear canal entrance 102L from being damaged may be attached to the rear end portion of the tubular duct 298L. In this case, the protection part 299L can be made to listen to the listener without blocking ambient sounds by being configured with a sponge-like member or the like through which sound can easily pass.

  In the second embodiment, the case where the tubular duct 208L formed of a hard material such as metal is used has been described. However, the present invention is not limited to this, and a soft resin such as a flexible resin is used. A tubular duct 208L formed of a material may be used. In this case, it is desirable to design the inner diameter and the path length in consideration of the difference in material of the tubular duct 208L.

  Furthermore, in the second embodiment, the case where the sound emitting surface of the speaker unit 207L is directed substantially rearward when the ear speaker device 200 is attached to the listener's head 100 (FIG. 22) has been described. However, the present invention is not limited to this, and for example, the sound emitting surface of the speaker unit 207L may be slightly inward. In short, the sound emitting surface of the speaker unit 207L is approximately in the direction of the ear canal entrance 102L. It is only necessary that the medium and high sounds to be reached efficiently reach the eardrum 103L.

  Furthermore, in the second embodiment, the case where the ear speaker device 200 has the left and right electroacoustic converters 202L and 202R and outputs the reproduced sound of two channels has been described. For example, only the left electroacoustic converter 202L may be provided to output one channel of reproduced sound.

  Furthermore, in the second embodiment, the case where the loudspeaker unit 207L for middle and high sounds is provided in the housing portion 204L has been described. However, the present invention is not limited to this. A plurality of speaker units may be provided in the housing part 204L, such as providing two speaker units in one housing part 204L to form a 2-way speaker.

  Furthermore, in the second embodiment, the case where the hemispherical cover portion 204LB is used has been described. However, the present invention is not limited to this, and may be a shape such as a quadrangular pyramid or a triangular pyramid. In short, any structure may be used as long as medium and high sounds output from the speaker unit 207L are collected and do not leak outside.

  Furthermore, in the second embodiment, the case where the housing portion 204L provided with the hemispherical portion 204LA having a structure in which the rear portion of the speaker unit 207L is closed is described, but the present invention is not limited to this. 32, a hemisphere in which through holes 305 to 308 are formed behind the speaker unit 207L and an acoustic resistor 309 made of sponge or the like that closes the through holes 305 to 308 from the inside is attached. A housing portion 304L having a shape portion 304LA may be used.

  In the case 304L (FIG. 32) in this case, the rear side of the speaker unit 207L is opened by the through holes 305 to 308 so that the diaphragm of the speaker unit 207L can easily follow the audio signal and pass through. Since the acoustic resistor 309 can prevent deterioration in sound quality due to the formation of the holes 305 to 308, medium sound with high sound quality can be radiated from the hole 208AL of the tubular duct 208L.

  Incidentally, in the case portion 304L (FIG. 32), the acoustic resistor 309 is not necessarily required, and the acoustic resistor 309 is attached if necessary, and the length and thickness thereof are changed. It is possible to adjust the sound quality.

  Furthermore, in the second embodiment, the case where the housing portion 204L provided with the hemispherical portion 204LA having a structure in which the rear portion of the speaker unit 207L is closed is described, but the present invention is not limited to this. 33, through-holes 405 to 408 are formed in front of the speaker unit 207L, and acoustic resistors 409 and 410 made of sponge or the like that close the through-holes 405 to 408 from the inside are attached. A housing portion 404L having a cover portion 404LB may be used.

  In the housing 404L (FIG. 33) in this case, the front side of the speaker unit 207L is opened by the through holes 405 to 408, so that the diaphragm of the speaker unit 207L can easily follow the audio signal and pass through. The sound resistance due to the formation of the holes 405 to 408 can be prevented by the acoustic resistors 409 and 410, so that high-quality medium and high sounds can be emitted from the hole 208AL of the tubular duct 208L.

  Incidentally, in the housing 404L (FIG. 33), the acoustic resistors 409 and 410 are not necessarily provided, and the acoustic resistors 409 and 410 are attached and the length and thickness thereof are changed as necessary. It is possible to adjust the sound quality by attaching the selected one.

  Further, in the second embodiment, the case where the casing 204L provided with the tubular duct 208L on the surface of the cover 204LB is described, but the present invention is not limited to this, and is shown in FIG. As described above, the housing portion 504L in which the tubular duct 508L is integrally provided on the surface of the hemispherical portion 504LA may be used.

  In this case, the casing 504L (FIG. 34) has a structure similar to that of a so-called kelton type speaker device, and confines middle and high sounds in a space in front of the speaker unit 207L, while a predetermined amount from the rear of the speaker unit 207L. Only the low frequency band can be radiated through the hole 508AL of the tubular duct 508L.

  Incidentally, the structure of the housing portion 504L (FIG. 34) is not limited to this. The rear portion of the speaker unit 207L is closed by a hemispherical portion, and a tubular duct is provided on any surface of the cover portion 204LB. A kelton type is also conceivable.

  Further, in the second embodiment, the case has been described in which the housing portion 204L formed with the tubular duct 208L integrated with the surface of the cover portion 204LB is used. However, the present invention is not limited to this. 35, the fitting portion 604LBS formed on the cover portion 604LB and the holding portion 608LS formed on one side of the tubular duct 608L are engaged with each other, whereby the tubular duct 608L is in contact with the cover portion 604LB. Alternatively, a housing portion 604L having a configuration that is detachably provided may be used.

  As a result, the casing 604L (FIG. 35) is used with the tubular duct 608L attached only when necessary for the listener, and is used with the tubular duct 608L removed when unnecessary for the listener. Therefore, the convenience of listeners can be greatly improved.

  Furthermore, in the second embodiment, the case has been described in which the housing 204L (FIG. 23) is used inside the cover 204LB and with an edge remaining at the base of the tubular duct 208L. The present invention is not limited to this, and as shown in FIG. 36, a housing portion 704L inside the cover portion 704LB and having an R-shaped round portion 711 formed at the base portion of the tubular duct 708L is used. Also good.

  In this housing portion 704L, the air pushed out from the front side of the speaker unit 207L does not hit the edge to generate a wind noise, and only high-quality medium and high sounds are emitted from the hole 708AL of the tubular duct 708L. be able to.

  Further, in the second embodiment, the case has been described in which the housing portion 204L formed with the tubular duct 208L integrated with the surface of the cover portion 204LB is used. However, the present invention is not limited to this. A structure in which a tubular duct formed into a thin tubular shape is attached to the baffle plate 204AL as it goes to the tip in a shape that wraps the front side of the speaker unit 207L without distinguishing the cover portion 204LB and the tubular duct 208L. You may make it use the housing | casing part.

  Furthermore, in the second embodiment, a case has been described in which the tubular duct 208L in which the duct length to the surface of the cover portion 204LB with the hole 208AL as the center is set to the same length is used. The invention is not limited to this, and tubular ducts having different lengths may be used.

  For example, as shown in FIG. 37 in which parts corresponding to those in FIG. 20 are denoted by the same reference numerals, a length L3 from the hole 808AL to the inner end 808BL1, and a length L4 from the hole 808AL to the inner end 808BL2 In the casing portion 804L provided with the tubular duct 808L having different lengths, a phase shift of the resonance characteristics occurs between the duct portion having the length L3 and the duct portion having the length L4, and as a result, a slight output is generated from the hole portion 808AL. The frequency component in the middle / high range is canceled out, and only the low tone in which the middle / high tone is canceled can be radiated from the hole 808AL of the tubular duct 208L2.

  Furthermore, in the second embodiment, the case where the microphones MF2L and MF2R are used as binaural recording microphones has been described. However, the present invention is not limited to this, and the microphones for realizing the noise canceling function can also be used. You may make it also use.

  In this case, in the ear speaker device 200, when the listener listens to the reproduced sound, the external noise is collected by the microphones MF2L and MF2R, and if the sound is generated and output in a phase opposite to the external noise, the listener Only the playback sound can be heard.

  Further, in the second embodiment, the housing parts 204L and 204R as the housing parts, the speaker units 207L and 207R as the speaker units, the tubular ducts 208L and 208R as the tubular ducts, and the binaural recording microphone Although the case where the electroacoustic transducers 202L and 202R as electroacoustic transducers are configured by the microphones MF2L and MF2R as described above is described, the present invention is not limited to this, and the casing unit having other various configurations The electroacoustic transducer may be configured by a speaker unit, a tubular duct, and a binaural recording microphone.

  Further, in the second embodiment, the housing portions 204L and 204R as the housing portions, the speaker units 207L and 207R as the speaker units, the band portion 3 as the mounting portion, and the tubular duct 208L as the tubular duct. , 208R and microphones MF2L and MF2R as binaural recording microphones have been described as constituting the ear speaker device 1 as the ear speaker device. However, the present invention is not limited to this and the present invention is not limited to this. You may make it comprise an ear speaker apparatus with a body part, a speaker unit, a mounting part, a tubular duct, and a microphone for binaural recording.

  The present invention can be used not only for bass reflex type speakers but also for various types of ear speaker devices in which speaker devices having various ducts are mounted on the listener's head in addition to the back load horn type.

It is a rough-line perspective view which shows the whole structure (1) of the ear speaker apparatus in 1st Embodiment. It is a rough-line rear view which shows the whole structure (2) of the ear speaker apparatus in 1st Embodiment. It is a rough-line front view which shows the whole structure (3) of the ear speaker apparatus in 1st Embodiment. It is a rough-line side view which shows the mounting state (1) of the ear speaker apparatus in 1st Embodiment. It is a rough-line top sectional view which shows the mounting state (2) of the ear speaker apparatus in 1st Embodiment. It is an approximate line top sectional view showing a general bass reflex type ear speaker device. It is a basic diagram which shows the frequency characteristic in the conventional bass-reflex type speaker. It is a basic diagram which shows the frequency characteristic of the ear speaker apparatus in 1st Embodiment. It is a basic diagram which shows a theoretical frequency characteristic. It is a basic diagram which shows the frequency characteristic by measurement. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment (1). It is a rough-line side view which shows the example (2) of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment. It is a rough-line side view which shows the example (3) of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment (4). It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment (5). It is a rough-line side view which shows the example (6) of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 1st Embodiment (7). It is a rough-line perspective view which shows the structural example (1) of the tubular duct by other embodiment. It is a rough-line perspective view which shows the structural example (2) of the tubular duct by other embodiment. It is a rough-line perspective view which shows the structural example (3) of the tubular duct by other embodiment. It is a rough-line perspective view which shows the whole structure of the ear speaker apparatus in 2nd Embodiment. It is a rough-line side view which shows the mounting state (1) of the ear speaker apparatus in 2nd Embodiment. It is a rough-line top sectional view which shows the mounting state (2) of the ear speaker apparatus in 2nd Embodiment. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment (1). It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment (2). It is a rough-line side view which shows the example (3) of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment (4). It is a rough-line side view which shows the example (5) of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment. It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment (6). It is a rough-line side view which shows the example of a structure and mounting | wearing of the ear speaker apparatus in 2nd Embodiment (7). It is a rough-line perspective view which shows the structural example (4) of the tubular duct by other embodiment. It is a rough-line sectional drawing which shows the structural example (1) of the housing | casing part by other embodiment. It is a rough-line sectional view which shows the structural example (2) of the housing | casing part by other embodiment. It is a rough-line sectional drawing which shows the structural example (3) of the housing | casing part by other embodiment. It is a rough-line perspective view which shows the structure (5) of the tubular duct by other embodiment. It is a rough-line perspective view which shows the structure (6) of the tubular duct by other embodiment. It is a rough-line perspective view which shows the structure (7) of the tubular duct by other embodiment.

Explanation of symbols

  1, 20, 30, 40, 50, 60, 70, 80, 90, 200, 220, 230, 240, 250, 260, 270, 280, 290... Ear speaker device, 2L, 2R, 72L, 92L, 202L , 202R... Electroacoustic conversion unit, 3, 31, 51, 61, 71, 81... Band unit, 4L, 4L1, 4L3, 4R, 204L, 204R, 304L, 404L, 504L, 604L, 704L, 804L. Case, 7L, 7R, 207L, 207R ... Speaker unit, 8L, 8R, 208L, 208R, 261L, 281L, 298L, 308L, 608L, 708L, 808L ... Tubular duct, 8AL, 8AR, 208AL, 208AR ... ... hole, 100 ... head, 101L ... pinna, 102L ... ear canal entrance, 103L ... tympanic membrane

Claims (5)

A housing part mounted at a predetermined position on the listener's head;
A speaker unit that is attached to one surface of the housing part and has a predetermined distance between the listener and the ear canal entrance when the housing part is attached to the listener's head;
A tubular duct extended to reach the vicinity of the ear canal entrance of the listener, with the sound generated from the front of the speaker unit;
A binaural recording microphone installed in the vicinity of the speaker unit ;
The tubular duct is
Electricity that extends from the housing part to the vicinity of the ear canal entrance of the listener and is formed in a substantially U shape that returns to the housing part again, and is provided with a sound emitting hole in the vicinity of the ear canal entrance of the listener. Acoustic transducer. The above binaural recording microphone is an omnidirectional type.
Electro-acoustic transducer according to 請 Motomeko 1. The binaural recording microphone is also used as a noise canceling microphone.
Electro-acoustic transducer according to 請 Motomeko 1. In the binaural recording microphone, the speaker unit itself is used as the microphone.
Electro-acoustic transducer according to 請 Motomeko 1. A housing portion mounted at a predetermined position on the listener's head, and attached to one surface of the housing portion, and when the housing portion is mounted on the listener's head, between the listener's ear canal entrance A speaker unit provided with a predetermined distance, a tubular duct extended so that sound generated from the front surface of the speaker unit reaches the vicinity of the entrance of the ear canal of the listener, and binaural recording attached in the vicinity of the speaker unit An electroacoustic transducer having a microphone for use;
A mounting portion for mounting the electroacoustic transducer on the head of the listener so that the predetermined distance is provided between the speaker unit and the ear canal entrance of the listener ;
The tubular duct is
An ear that extends from the housing to the vicinity of the ear canal entrance of the listener and is formed in a substantially U shape that returns to the housing again, and has a sound emitting hole in the vicinity of the ear canal entrance of the listener. Speaker device.

Images