Abstract:
[Problem] To provide a headphone device that is equipped with an ear pad to be inserted into an ear, is electrically connected to a player device via a cable and outputs an audio signal which is output from the player device, with which it is possible to improve in-ear wearability and prevent a pain from being caused inside the ear. [Solution] The headphone device is equipped with: a driver unit that is fixed to a housing and has a diaphragm for emitting a sound of an audio signal; and a nozzle section that is fixed to the housing at one end, holds an ear pad at the other end, has a hollow interior, and is formed so as to slope from the part where the nozzle is fixed to the housing toward the tip of the nozzle section at a predetermined angle with respect to the housing.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the National Stage of International Application No. PCT/JP2012/078097, filed Oct. 31, 2012, which claims the benefit of Japanese Patent Application No. 2011-283068, filed Dec. 26, 2011. The contents of these prior applications are incorporated by reference herein in their entirety. 
     TECHNICAL FIELD 
     The present invention relates to a headphone device to be connected to a reproducing device through a cable, for outputting an audio signal output from the reproducing device. 
     BACKGROUND ART 
     As a related-art headphone device, there is known a headphone device including an ear pad to be inserted into an inside of an ear of a user, and electrically connected to a reproducing device through a cable, for outputting an audio signal output from the reproducing device. 
     In the related-art headphone device of a type in which the ear pad is inserted into the inside of the ear, in order to enhance wearing comfort of the headphone device inside the ear of the user, a protruding angle of the ear pad is offset by a given angle with respect to a housing, and thus the wearing comfort of the headphone device in the ear is enhanced (for example, see Patent Literature 1). 
       FIG. 5  is a top view illustrating a state in which the related-art headphone device, in which the protruding angle of the ear pad is offset by a given angle with respect to the housing, is attached to the ear of the user. 
     In  FIG. 5 , the upper side of the drawing sheet corresponds to an outer side of the ear of the user, and the right side of the drawing sheet corresponds to a front side of the user. 
     As illustrated in  FIG. 5 , a related-art headphone device  100  includes a housing  200  and an ear pad  4 . The ear pad  4  is formed of an elastic body such as a resin/rubber member, and is arranged to be offset toward the front side of the user by a given angle with respect to the housing  200 . Through a cable (not shown), the headphone device  100  inputs an audio signal output from a reproducing device (not shown) to a driver unit provided inside the housing  200 , and the driver unit outputs the audio signal as a sound wave. The sound wave of the audio signal output by the driver unit is transmitted through the ear pad, and is emitted as sound to the inside of the ear of the user. 
     When attaching the headphone device  100  to an ear  50 , as illustrated in  FIG. 5 , a distal end of the ear pad  4  is inserted from an ear concha  501  toward an ear canal  502 , and an outer peripheral portion of the ear pad  4  is held on an inner wall of an ear canal entrance  503 . At this time, the ear canal entrance  503  of the ear  50  protrudes forward from an inner side of the ear concha  501 . Accordingly, the ear pad  4  of the headphone device  100  is arranged to be offset toward the front side of the user with respect to the housing  200 , and thus the outer peripheral portion of the ear pad  4  is properly held on the inner wall of the ear canal entrance  503 . As a result, wearing comfort of the headphone device  100  is enhanced. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] JP 2007-189468 A 
     SUMMARY OF INVENTION 
     Technical Problems 
     In the related-art headphone device in which the protruding angle of the ear pad is offset by a given angle with respect to the housing, under a state in which the user wears the headphone device  100  in the ear  50 , a part of an outer periphery of the housing  200  partially presses a swelling portion of the ear canal entrance  503  indicated by the arrow A in  FIG. 5 , and the housing  200  presses a swelling portion of a tragus  504  indicated by the arrow B in  FIG. 5 . 
     Thus, when the user wears the headphone device  100  for a long period of time under a state in which the housing  200  presses the swelling portion of the ear canal entrance  503  and the swelling portion of the tragus  504 , the ear canal entrance  503  and the tragus  504  are continuously pressed by the outer peripheral portion of the housing  200  for a long period of time, and hence a pain may be caused in the ear canal entrance  503  and the tragus  504 . When the outer peripheral portion of the housing  200  of the related-art headphone device  100  presses the ear canal entrance  503  and the tragus  504  of the ear  50  for a long period of time to cause a pain inside the ear  50 , wearing comfort of the headphone device  100  may be deteriorated. 
     It is an object of the present invention to provide a headphone device including an ear pad to be inserted into an inside of an ear of a user, electrically connected to a reproducing device through a cable, for outputting an audio signal output from the reproducing device, and capable of enhancing wearing comfort in the ear and preventing a pain inside the ear. 
     Solution to Problems 
     According to one embodiment of the present invention, there is provided a headphone device for outputting an audio signal input to an input terminal through a cable, the headphone device including: a driver unit fixed to a housing, the driver unit including a diaphragm for emitting the audio signal as sound; and a nozzle section having one end fixed to the housing, another end holding an ear pad, and a hollow interior, the nozzle section being formed so as to be inclined by a predetermined angle with respect to the housing in a region from a portion of the nozzle section fixed to the housing toward a distal end portion of the nozzle section. 
     According to another embodiment of the present invention, in the headphone device, the nozzle section includes an outwardly curved portion formed at an intermediate portion of one side surface of the nozzle section so as to swell outwardly. 
     According to another embodiment of the present invention, in the headphone device, the nozzle section includes an inwardly curved portion formed at an intermediate portion of one side surface of the nozzle section so as to swell inwardly. 
     According to another embodiment of the present invention, the headphone device further includes a wing-like plate portion formed of a thin plate and arranged above the housing. 
     Advantageous Effects of Invention 
     According to one embodiment of the present invention, it is possible to provide the headphone device including the ear pad to be inserted into the inside of the ear of the user, electrically connected to the reproducing device through the cable, for outputting the audio signal output from the reproducing device, and capable of enhancing the wearing comfort in the ear and preventing the pain inside the ear. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side cross-sectional view illustrating a headphone device according to an embodiment of the present invention. 
         FIG. 2  is a top cross-sectional view of a headphone device  1  illustrated in  FIG. 1 . 
         FIG. 3  is a top view illustrating a state in which the headphone device  1  according to the embodiment of the present invention is attached to an ear of a user. 
         FIG. 4  are views illustrating a headphone device according to another embodiment of the present invention.  FIG. 4(   a ) is a top view of the headphone device, and  FIG. 4(   b ) is a front view of the headphone device. 
         FIG. 5  is a top view illustrating a state in which a related-art headphone device, in which a protruding angle of an ear pad is offset by a given angle with respect to a housing, is attached to the ear of the user. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present invention are described with reference to the drawings. Note that, the same components as those described in the “Background Art” section and illustrated in  FIG. 5  are denoted by the same reference symbols. 
       FIG. 1  is a side cross-sectional view illustrating a headphone device according to an embodiment of the present invention. 
     A headphone device  1  includes a housing  2 , a nozzle section  3 , an ear pad  4 , a cable  6 , a driver unit  7 , and an input terminal (not shown). 
     In the headphone device  1  illustrated in  FIG. 1 , the left side of the drawing sheet corresponds to a front side of the headphone device  1 , and the upper side of the drawing sheet corresponds to an upper side of the headphone device  1 . 
       FIG. 2  is a top cross-sectional view of the headphone device  1  illustrated in  FIG. 1 . 
     In the headphone device  1  illustrated in  FIG. 2 , the lower side of the drawing sheet corresponds to the front side of the headphone device  1 , the right side of the drawing sheet corresponds to a right side of the headphone device  1 , and the left side of the drawing sheet corresponds to a left side of the headphone device  1 . 
     As illustrated in  FIGS. 1 and 2 , the housing  2  is formed into a cylindrical shape. The housing  2  includes a recessed portion  201  that is open to the front side of the headphone device, and a hole  202  is formed in a lower portion of the housing  2 . One end of the cable  6  is inserted into an inside of the housing  2  through the hole  202  of the housing  2 , and the cable  6  forms a knot  601  inside the housing  2 . The knot  601  prevents the cable  6  from falling out of the housing  2  downwardly. A lead wire  602  protrudes from the one end of the cable  6  that forms the knot  601  inside the housing  2 . 
     The driver unit  7  includes a diaphragm (not shown), and is electrically connected to the lead wire  602  of the cable  6 . The driver unit  7  is fixed on an inner wall of a front portion of the housing  2  with an adhesive or the like. 
     As illustrated in  FIG. 1 , the nozzle section  3  has a hollow interior, and is formed into such a conical shape that an external shape of the nozzle section  3  is narrowed from a rear portion  302  toward a front portion  301 . Further, as illustrated in  FIG. 2 , the nozzle section  3  is formed so as to be inclined to the right side in an offset manner by an angle C with respect to the housing  2  in a region from the rear portion  302  toward the front portion  301 . In this embodiment, an angle of the inclination is set to 40 degrees. The nozzle section  3  is inclined to the right side by the angle C with respect to the housing  2  in the region from the rear portion  302  toward the front portion  301 . In addition to this configuration, the nozzle section  3  includes an outwardly curved portion  306  that is formed at an intermediate portion of a left side surface of the nozzle section  3  so as to swell outwardly, and includes an inwardly curved portion  307  that is formed at an intermediate portion of a right side surface of the nozzle section  3  so as to swell inwardly. 
     The rear portion  302  of the nozzle section  3  is fixed to a distal end portion of the housing  2  with an adhesive or the like. A protruding portion  303  is formed on a front part of the front portion  301  of the nozzle section  3 . The protruding portion  303  is formed into a cylindrical shape, and has a hole  304  formed to penetrate therethrough in a fore-and-aft direction. The protruding portion  303  includes a groove portion  305  formed in a center portion of an outer periphery thereof. 
     The ear pad  4  is formed of an elastic body such as a rubber member into a cylindrical shape. The ear pad  4  has a hole  401  formed to penetrate therethrough in the fore-and-aft direction. The ear pad  4  includes a flange portion  402  on an inner part on a rear side thereof. The ear pad  4  is held on a front side of the nozzle section  3  in such a manner that the flange portion  402  is fitted into the groove portion  305  of the protruding portion  303 . 
     The headphone device  1  includes an input terminal (not shown) provided at another end of the cable  6  that is inserted into the housing  2 . The input terminal is connected to an output terminal of a reproducing device (not shown). By the input terminal, the headphone device  1  inputs an audio signal output from the output terminal of the reproducing device, and emits, from the driver unit  7  through the cable  6 , the audio signal input by the input terminal as sound. The user of the headphone device  1  causes the reproducing device to reproduce the audio signal under a state in which the user inserts the ear pad  4  into the ear. In this way, the audio signal reproduced by the reproducing device is emitted as sound by the driver unit  7  through the input terminal and the cable  6 , and the audio signal emitted as sound is transmitted to an inside of the hole  401  of the ear pad  4  through an inside of the nozzle section  3 . Thus, the user can listen to the audio signal output from the headphone device  1  in a state of wearing the headphone device  1  in the ear. 
       FIG. 3  is a top view illustrating a state in which the headphone device  1  according to this embodiment is attached to the ear of the user. 
     In  FIG. 3 , the upper side of the drawing sheet corresponds to an outer side of the ear of the user, and the right side of the drawing sheet corresponds to a front side of the user. 
     When attaching the headphone device  1  to an ear  50 , as illustrated in  FIG. 3 , a distal end of the ear pad  4  is inserted from an ear concha  501  toward an ear canal  502 , and an outer peripheral portion of the ear pad  4  is held on an inner wall of an ear canal entrance  503 . At this time, an inner wall of the ear canal entrance  503  inside the ear  50  protrudes forward from the inner side of the ear concha  501 , and an inner wall of a tragus  504  is inclined forward in a region from an entrance of the ear  50  toward the inside of the ear. In the headphone device  1 , the nozzle section  3  is formed so as to be inclined to the right side by the angle C with respect to the housing  2  in the region from the rear portion  302  toward the front portion  301 , and hence wearing comfort of the headphone device  1  can be enhanced. 
     The headphone device  1  according to this embodiment includes the outwardly curved portion  306  that is formed at the intermediate portion of the left side surface of the nozzle section  3  so as to swell outwardly. Accordingly, under a state in which the ear pad  4  is held in the ear canal entrance  503 , the nozzle section  3  and a part of an outer periphery of the housing  2  do not partially press a swelling portion of the ear canal entrance  503  indicated by the arrow A in  FIG. 3 , but abut on a swelling portion of the ear canal entrance  503  at a portion having a large area on the surface of the outwardly curved portion  306  of the nozzle section  3 . In this way, the portion having a large area on the surface of the outwardly curved portion  306  of the nozzle section  3  abuts on the swelling portion of the ear canal entrance  503 , and thus a pressing force to be applied to the ear canal entrance  503  per given area is reduced. Accordingly, it is possible to prevent the headphone device  1  from causing a pain in the ear canal entrance  503 . Further, the headphone device  1  according to this embodiment includes the inwardly curved portion  307  that is formed at the intermediate portion of the right side surface of the nozzle section  3  so as to swell inwardly. Accordingly, under the state in which the ear pad  4  is held in the ear canal entrance  503 , the nozzle section  3  and the outer peripheral portion of the housing  2  do not press a swelling portion of the tragus  504  indicated by the arrow B in  FIG. 3 . 
     As described above, the headphone device  1  according to this embodiment includes the outwardly curved portion  306  that is formed at the intermediate portion of the left side surface of the nozzle section  3  so as to swell outwardly, and includes the inwardly curved portion  307  that is formed at the intermediate portion of the right side surface of the nozzle section  3  so as to swell inwardly. Accordingly, even when the user wears the headphone device  1  for a long period of time, it is possible to prevent the headphone device  1  from causing a pain inside the ear  50  because of continuous pressing of the headphone device  1  onto the inner wall portion of the ear canal entrance  503  and the inner wall portion of the tragus  504 . 
     Further, according to the headphone device  1  of this embodiment, under the state in which the headphone device  1  is inserted into the ear and the outer peripheral portion of the ear pad  4  is held on the inner wall of the ear canal entrance  503 , the portion having a large area on the surface of the outwardly curved portion  306  of the nozzle section  3  abuts on the swelling portion of the ear canal entrance  503 , but does not press the tragus  504 . Accordingly, under a state in which the surface of the ear pad  4  properly abuts on the inner wall of the ear canal entrance  503 , the audio signal output from the driver unit  7  is properly transmitted to the ear canal  502  of the ear  50  through the inside of the nozzle section  3  and the inside of the ear pad  4 , and hence it is possible to enhance sound quality of the audio signal output by the headphone device  1 . 
     As illustrated in  FIG. 2 , the headphone device  1  according to this embodiment has a configuration in which the nozzle section  3  is formed so as to be inclined to the right side by 40 degrees with respect to the housing  2  in the region from the rear portion  302  toward the front portion  301 . However, the angle of the inclination may be set to any angle other than 40 degrees in conformity to a shape of the ear of the user. Further, for example, the angle of the inclination of the nozzle section  3  may be changed freely, and the angle of the inclination of the nozzle section  3  may be changed into an arbitrary angle in accordance with preference of the user. 
     The headphone device  1  according to this embodiment includes the outwardly curved portion  306  that is formed at the intermediate portion of the left side surface of the nozzle section  3  so as to swell outwardly, and includes the inwardly curved portion  307  that is formed at the intermediate portion of the right side surface of the nozzle section  3  so as to swell inwardly. However, in a case where the user does not feel uncomfortable when the outer periphery of the nozzle section  3  partially abuts on the swelling portion of the tragus  504  of the ear  50 , the headphone device  1  may have a configuration in which the inwardly curved portion  307  swelling inwardly is not formed at the intermediate portion of the right side surface of the nozzle section  3 , and only the outwardly curved portion  306  swelling outwardly is formed at the intermediate portion of the left side surface of the nozzle section  3 . 
     Further, the headphone device  1  according to this embodiment includes the outwardly curved portion  306  that is formed at the intermediate portion of the left side surface of the nozzle section  3  so as to swell outwardly, and includes the inwardly curved portion  307  that is formed at the intermediate portion of the right side surface of the nozzle section  3  so as to swell inwardly. However, in a case where the user does not feel uncomfortable when the part of the outer periphery of the nozzle section  3  abuts on the swelling portion of the ear canal entrance  503  of the ear  50 , the headphone device  1  may have a configuration in which the outwardly curved portion  306  swelling outwardly is not formed at the intermediate portion of the left side surface of the nozzle section  3 , and only the inwardly curved portion  307  swelling inwardly is formed at the intermediate portion of the right side surface of the nozzle section  3 . 
     The headphone device  1  according to this embodiment includes the cable  6  for inputting the audio signal from the reproducing device, but the headphone device  1  may have such a configuration that the cable  6  is not provided and, for example, the driver unit  7  inputs the audio signal from the reproducing device through wireless communication. As described above, the headphone device  1  has the configuration in which the driver unit  7  inputs the audio signal from the reproducing device through wireless communication, and thus the headphone device  1  does not need to include the cable  6 . Accordingly, when the user walks or jogs, wearing comfort of the headphone device  1  can be further enhanced. 
     Next, a headphone device according to another embodiment of the present invention is described. 
       FIG. 4  are views illustrating the headphone device according to the another embodiment of the present invention.  FIG. 4(   a ) is a top view of the headphone device, and  FIG. 4(   b ) is a front view of the headphone device. 
     In  FIG. 4(   a ), the lower side of the drawing sheet corresponds to a front side of the headphone device, the right side of the drawing sheet corresponds to a right side of the headphone device, and the left side of the drawing sheet corresponds to a left side of the headphone device. 
     In  FIG. 4(   b ), the upper side of the drawing sheet corresponds to an upper side of the headphone device, the right side of the drawing sheet corresponds to the right side of the headphone device, and the left side of the drawing sheet corresponds to the left side of the headphone device. 
     The headphone device according to the another embodiment of the present invention has such a configuration that only a wing-like plate portion described below is added to the configuration of the headphone device  1  according to the above-mentioned embodiment, and hence description of the above-mentioned components is omitted. 
     As illustrated in  FIG. 4 , a headphone device  10  includes a wing-like plate portion  8  in addition to the above-mentioned components of the headphone device  1 . 
     As illustrated in  FIG. 4(   b ), the wing-like plate portion  8  is formed of an elastic body such as a rubber member or a plastic member, and is formed of a wing-shaped thin plate. A lower portion of the wing-like plate portion  8  is fixed to a front portion of the housing  2  so that the wing-like plate portion  8  is arranged above the front portion of the housing  2 . 
     When attaching the headphone device  10  to the ear, similarly to the case described with reference to  FIG. 3 , the distal end of the ear pad  4  is inserted into the inside of the ear, and the outer peripheral portion of the ear pad  4  is held on the inner wall of the ear canal entrance. Further, the wing-like plate portion  8  arranged above the housing  2  is fitted into a depressed portion of the ear concha. In this manner, the ear pad  4  of the headphone device  10  is inserted into the inside of the ear, and the wing-like plate portion  8  abuts on an upper inner wall of the ear concha. Accordingly, the wing-like plate portion  8  abuts on the upper inner wall of the ear concha, and thus the headphone device  10  is correctly held in the depressed portion of the ear concha by the wing-like plate portion  8 . 
     As described above, similarly to the above-mentioned headphone device  1 , the headphone device  10  according to the another embodiment of the present invention includes the outwardly curved portion  306  that is formed at the intermediate portion of the left side surface of the nozzle section  3  so as to swell outwardly. Hence, the nozzle section  3  and a part of the outer periphery of the housing  2  do not partially press the swelling portion of the ear canal entrance, and the portion having a large area on the surface of the outwardly curved portion  306  of the nozzle section  3  abuts on the swelling portion of the ear canal entrance. Further, the headphone device  10  includes the inwardly curved portion  307  that is formed at the intermediate portion of the right side surface of the nozzle section  3  so as to swell inwardly. Hence, the user can wear the headphone device  10  in the ear under a state in which the nozzle section  3  and the outer peripheral portion of the housing  2  do not press the swelling portion of the tragus. In addition, the wing-like plate portion  8  abuts on the upper inner wall of the ear concha, and thus the headphone device  10  can be correctly held in the depressed portion of the ear concha. Accordingly, even when a gap is formed between the outwardly curved portion  306  and the inner wall inside the ear and between the inwardly curved portion  307  and the inner wall inside the ear, the wing-like plate portion  8  abuts on the upper inner wall of the ear concha, and thus the headphone device  10  is correctly held in the depressed portion of the ear concha. Accordingly, it is possible to prevent the ear pad  4  from falling out of the ear and prevent displacement of a position of wearing the ear pad  4  while the user wears the headphone device  10  in the ear. 
     The headphone device  10  according to the another embodiment of the present invention has such a configuration that the wing-like plate portion  8  is formed of a wing-shaped thin plate and is fixed to the housing  2  so as to be arranged above the front portion of the housing  2 . However, the wing-like plate portion  8  may have any shape other than the wing-like shape as long period of as the wing-like plate portion  8  can be fitted into the depressed portion of the ear concha. Further, the headphone device  10  may have a configuration in which the wing-like plate portion  8  is not fixed to the housing  2 , but is fixed to, for example, the ear pad  4  or the nozzle section  3 . 
     The headphone device  10  according to the another embodiment of the present invention has such a configuration that the wing-like plate portion  8  is fixed to the housing  2 . However, the wing-like plate portion  8  may be removable from the housing  2  or the nozzle section  3  of the headphone device  10 . In this case, for example, a recessed portion is formed in an upper surface portion of the housing  2 , and a protruding portion is formed on a bottom portion of the wing-like plate portion  8 . The protruding portion of the wing-like plate portion  8  is configured to be fitted into the recessed portion of the housing  2 , and thus the wing-like plate portion  8  is removable from the housing  2 . With this configuration, the headphone device  10  can be shifted between a state of including the wing-like plate portion  8  and a state of not including the wing-like plate portion  8  in accordance with preference of the user, and hence it is possible to enhance convenience when wearing the headphone device  10  in accordance with the user&#39;s purpose, feeling in use, and the like. 
     In the headphone device  10  according to the another embodiment of the present invention, the wing-like plate portion  8  is formed of a thin plate. However, the wing-like plate portion  8  may be formed of, for example, a thin mesh material other than a thin plate member, or may have protrusions and recesses or a plurality of holes formed in the surface of the wing-like plate portion  8 . With this configuration, it is possible to enhance a wearing feeling when the wing-like plate portion  8  touches the ear, and hence wearing comfort in a case of wearing the headphone device  10  in the ear can be further enhanced. 
     INDUSTRIAL APPLICABILITY 
     The present invention can be effectively applied to the headphone device to be connected to the reproducing device through the cable, for outputting the audio signal output from the reproducing device. 
     REFERENCE SIGNS LIST 
       1  headphone device,  2  housing,  201  recessed portion,  202  hole,  3  nozzle section,  301  front portion,  302  rear portion,  303  protruding portion,  304  hole,  305  groove portion,  306  outwardly curved portion,  307  inwardly curved portion,  4  ear pad,  401  hole,  402  flange portion,  6  cable,  601  knot,  602  lead wire,  7  driver unit,  8  wing-like plate portion,  50  ear,  501  ear concha,  502  ear canal,  503  ear canal entrance,  504  tragus,  10  headphone device,  100  headphone device,  200  housing