JP5348102B2 - headphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headphone with less sound leakage to an external part, while preventing the indistinctness of sound. <P>SOLUTION: A headphone 100 related to the present invention includes: speaker units 310; housings 320 each of which forms an internal space BC on the back side together with the speaker unit 310 and has a first hole (a through-hole HL) for communication between the internal space BC and an external space; and annular tube members 3310 each of which is arranged inside the internal space BC and internally has a first space S1 where one end communicates with the first hole and the other end is opened inside the internal space BC. The tube member 3310 is arranged to separate the internal space BC into a second space S2 and a third space S3. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a headphone, and more particularly, to a headphone that generates less sound in a housing.

Some conventional headphones are configured to seal a space formed on the back side of the speaker unit and prevent sound leakage to the outside. In particular, in a headphone used in a studio, when a musician records in front of a microphone, sound leaked to the outside may be collected by the microphone, so it is necessary to suppress sound leakage as much as possible.
However, when the space formed on the back side of the speaker unit is sealed, there is a tendency for the sound to become muffled.

  By the way, in Patent Document 1, for example, a hole for acoustic characteristic adjustment (hereinafter sometimes referred to as a sound quality adjustment hole) that allows air to flow between the internal space and the external space of the housing is provided in the headphone housing. Technology is disclosed.

Japanese Patent Laid-Open No. 8-33080

  When the sound quality adjusting hole is provided in the housing as in Patent Document 1, there is a problem that sound leaks to the outside.

  An object of the present invention is to solve the above-described problems, and is to provide a headphone with little sound leakage to the outside while preventing sound from being heard.

A headphone according to the present invention includes a speaker unit, a housing that forms an internal space on the back side together with the speaker unit, and has a first hole that communicates the internal space and the external space, and is disposed in the internal space. An annular tube member having a first space in which one end portion is communicated with the first hole and the other end portion is opened in the internal space. The internal space is arranged to be divided into a second space and a third space.
The tube member preferably has a straight tubular shape.
The second space and the third space are preferably subjected to different acoustic processing.
It is preferable that the first hole is formed on the rear side of the head in the use form of the user in the housing.
One end of the tube member is preferably communicated with the first hole through an air chamber.
The housing has a second hole formed on the front side of the head at the time of use by the user to communicate the internal space and the external space, and the flow rate of air passing through the second hole is reduced. It is preferable to further include a flow rate reduction unit to be caused.

  According to the present invention, it is possible to provide a headphone with less sound leakage to the outside while preventing sound from being heard.

1 is a perspective view showing a headphone according to an embodiment of the present invention. FIG. 3 is a structural diagram of a sound output unit in the headphones according to the embodiment of the present invention. (A) is a top view which shows the sound output part which abbreviate | omitted the ear pad. (B) is AA arrow sectional drawing of (a). (A) is a rear view which shows the sound output part which abbreviate | omitted the ear pad. (B) is BB arrow sectional drawing of (a). It is a perspective view which shows the sound quality adjustment mechanism in the internal space of a housing. It is a perspective view which shows the sound quality adjustment mechanism in the internal space of a housing.

  A headphone according to an embodiment of the present invention will be described. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate. In the present embodiment, as shown in FIG. 1, the left-right direction when used on the user's head is defined as the Y-axis direction, the front-rear direction is defined as the X-axis direction, and the up-down direction is defined as the Z-axis direction. To do.

As shown in FIG. 1, the headphones 100 according to the present embodiment include a band unit 200 and a pair of left and right (L and R) sound output units 300 that are swingably coupled to both ends of the band unit 200. Like the headband used for general headphones, the band unit 200 preferably includes a length adjustment mechanism (not shown) so that the user can wear the head well. The left and right end portions of the band portion 200 are divided into two forks in the front-rear direction. That is, the left and right end portions of the band portion 200 include bifurcated hangers 210. The lower end portion of the hanger 210 includes a pin 211 that protrudes so as to face each other. The pin 211 is inserted into an insertion hole formed in the housing 320 that is a component of the sound output unit 300. As a result, the sound output unit 300 can swing around the X axis.
A signal cable 500 is drawn from the sound output unit 300 on the L side.

Since the L and R sound output units 300 have a symmetrical structure, the L side sound output unit will be described below as a representative.
As shown in FIG. 2, the sound output unit 300 includes a speaker unit 310, a housing 320, a sound quality adjustment mechanism 330, a holder 340, a baffle 350, a sound absorbing material 360, an ear pad 370, a tubular member 380, a covering member 390, and a cover member 400. Is provided.

The speaker unit 310 operates based on the audio signal from the signal cable 500.
From the signal cable 500, a signal cable (not shown) that passes through the band unit 200 and goes to the R-side sound output unit 300 is branched, and thereby, to the speaker unit 310 of the R-side sound output unit 300. An audio signal is supplied.
The speaker unit 310 is fixed to the baffle 350 by the holder 340.

  As shown in FIGS. 3B and 4B, the housing 320 includes a bottom portion 322 having an elliptical bottom surface 322t, an annular side portion 321 erected from the periphery of the bottom portion 322, and a side portion 322. And an eaves portion 322tb extending radially outward from the opening end. Then, the outer peripheral portion of the outer surface side of the housing 320 is cut off to be accommodated when the hanger 210 of the band portion 200 is most rotated to the housing 320 side, as shown in FIGS. 3 (a) and 4 (a). A notch (accommodating part) 323 is provided.

The speaker unit 310 is fixed so as to be held between the baffle 350 and the holder 340.
A baffle 350 to which the speaker unit 310 is fixed by a holder 340 is fixed to the housing 320 by a bolt 600.

  The inner peripheral surface 321t and the bottom surface 322t of the side portion 321 in the housing 320, the back surface of the speaker unit 310, and the surface of the baffle 350 on the housing 320 side form an internal space (back cavity) BC. The housing 320 includes a sound quality adjustment mechanism 330 in the internal space BC. The housing 320 includes a first hole 3210 on the rear side at a substantially central position in the vertical direction of the side portion 321. Further, the housing 320 includes a second hole 3220 on the front side at a substantially central position in the vertical direction of the side portion 321.

The first hole 3210 of this embodiment is used as an insertion hole for inserting the pin 211 on the rear side of the band unit 200. Further, the second hole 3220 of the present embodiment is used as an insertion hole for inserting the pin 211 on the front side of the band part 200.
The housing 320 further includes a through hole HL in the vicinity of the first hole 3210 in the side portion 321.

  A bushing 700 is attached to the lower end portion of the housing 320 in order to insert the signal cable 500 and protect the signal cable 500 to ensure bending resistance. Incidentally, in the present embodiment, the housing 320 in the left sound output unit 300 includes the bushing 700. However, the housing 320 in the right sound output unit 300 may include the bushing 700.

  The sound quality adjustment mechanism 330 is arranged in the front-rear direction at a substantially central position in the up-down direction in the internal space BC. The sound quality adjustment mechanism 330 includes a tube member 3310, a first air chamber 3320, and a second air chamber (flow rate reducing unit) 3330. The tube member 3310 is different from the housing 320 formed of a synthetic resin material (ABS or the like) so that resonance with the housing 320 can be prevented and resonance with the tube member 3310 itself can be prevented. Made of material. For example, as the tube member 3310, a tube member made of silicon rubber or the like can be used.

  The tube member 3310 is disposed in a shape that is not substantially curved (that is, a straight tube shape). One end of the tube member 3310 is cut obliquely with respect to the longitudinal direction. The oblique inclination angle is 45 °, for example. One end of the tube member 3310 is opened in the internal space BC. The oblique opening surface at the one end is arranged so as to face the front side (that is, the baffle 350 side). However, the oblique opening surface at one end of the tube member 3310 may be arranged so that the sound emitted to the back side of the speaker unit 310 enters well.

  The other end of the tube member 3310 is cut in a direction substantially orthogonal to the longitudinal direction. The other end of the tube member 3310 communicates with the first hole 3210 and the through hole HL via the first air chamber 3320. That is, the tube member 3310 is connected only to the first hole 3210 and the through hole HL on the rear side of the housing 320. However, the other end of the tube member 3310 only needs to communicate with at least the through hole HL. As a result, the sound emitted to the back side of the speaker unit 310 enters from one end of the tube member 3310 and escapes from the first hole 3210 and the through hole HL on the rear side through the first air chamber 3320. And At this time, in the tube member 3310, the approach sound from one end portion of the tube member 3310 is reflected by the other end portion of the tube member 3310 and becomes a reflected sound. For this reason, the reflected sound cancels out in phase with respect to the incoming sound for sounds in a specific frequency band. That is, by appropriately selecting and adjusting the material, the diameter, the cutting angle, and the like of the tube member 3310, the volume of the desired frequency band can be attenuated, and the muffled sound of the headphones can be adjusted to a sound without muzzle. At this time, since the roaring sound is attenuated by the tube member 3310, even if the opening area of the through-hole HL is reduced, good sound quality can be obtained without sounding and sound leakage to the outside can be further reduced. .

  As described above, regarding the sound emitted to the back side of the speaker unit 310 and entering from one end of the tube member 3310, the sound having a desired frequency is substantially attenuated in the tube member 3310, and the sound that has not been attenuated is the first sound. Leaks to the outside through the hole 3210 and the through hole HL.

  Therefore, the headphone 100 according to the present embodiment can be configured to reduce sound leakage to the outside while preventing sound from being heard. Moreover, the headphone 100 of the present embodiment is provided with a through hole HL for adjusting the sound quality only on the rear side in addition to the hole into which the pin of the band unit 200 is inserted, and most of the sound leaking to the outside is in the housing 320. Since it leaks from the through hole HL on the rear side, for example, when a musician records in front of a microphone in a studio, the sound leaking from the headphone is not easily picked up by the microphone.

  In the internal space BC formed by the housing 320 or the like, the thickness of the tube member 3310 is set so as to close most of the gap between the speaker unit 310 and the bottom surface 322t. Thus, the internal space BC can be regarded as being partitioned by the tube member 3310 and divided into a plurality of spaces.

  Specifically, as shown in FIG. 3B and the like, the first space S1 that is a columnar space in the tube member 3310, and the second and third portions formed vertically with the tube member 3310 interposed therebetween. Spaces S2 and S3 are provided.

Therefore, different acoustic processing can be easily performed in the second space S2 and the third space S3.
For example, the acoustic processing can be changed by changing the insertion amount and material of the sound absorbing material 360 between the second space S2 and the third space S3, or omitting the sound absorbing material in one space.

Further, the vibration of the vibrating body of the speaker unit 310 has dependency on the internal space BC. More specifically, the higher the airtightness of the internal space BC, the more driving force is required to vibrate the vibrating body (plate) of the speaker unit 310. Conversely, the lower the airtightness of the internal space BC, the easier the vibrating body of the speaker unit 310 vibrates, and therefore the vibration of the vibrating body may become too large depending on the input signal. That is, the vibration of the vibrating body cannot follow the waveform of the input signal, and good reproduction cannot be performed.
Therefore, it is necessary to perform acoustic processing that adds an appropriate resistance to the air flow between the internal space BC and the external space.

  In the present embodiment, as described above, since different acoustic processing can be performed in the second space S2 and the third space S3, the variation in acoustic processing is reduced compared to the case where the internal space is regarded as one. Can be spread. Thereby, the headphones 100 according to the present embodiment can obtain better sound quality.

  Further, the vibration of the vibrating body of the speaker unit 310 may be slightly different in each part of the vibrating body. This is because, for example, a difference in depth dimension of the internal space BC and a difference in shape of each wall surface forming the internal space BC are reflected in the back pressure corresponding to each part of the diaphragm. Therefore, if different acoustic processing can be performed in the second space S2 and the third space S3, the acoustic processing can be performed more finely so that the vibrating body vibrates uniformly and satisfactorily.

  Furthermore, the tube member 3310 is disposed in a shape that is not substantially curved. Since the tube member 3310 has flexibility, the tube member 3310 can be bent, but is arranged in a natural linear form. Therefore, the shapes of the second space S2 and the third space S3 become simple shapes, which can contribute to simplification and speeding up of the acoustic processing.

  As described above, the headphones 100 according to the present embodiment can easily and quickly perform various comparative studies in the sound quality determination work by the current article in the design process. As a result, a better reproduction sound quality can be selected, and the development schedule can be shortened.

Details of the first and second air chambers 3320 and 3330 will be described.
The first air chamber 3320 is formed so as to surround the first hole 3210 and the through hole HL. The first air chamber 3320 has a hollow box shape.

  Specifically, as shown in FIG. 5, the first air chamber 3320 is connected to the side portion 321, the bottom portion 322, the side portion 321 and the bottom portion 322, and the first hole 3210 and the through hole HL are interposed therebetween. A locking piece 3321 protruding from both sides and a cover member 3322 having a substantially L-shaped cross section are provided, and is formed in a substantially box shape.

  The locking piece 3321 has a claw projecting inwardly at the tip. When the cover member 3322 is inserted between the locking pieces 3321 so that the front surface 3322a of the cover member 3322 is hooked on the claw portion of the locking piece 3321 and the members are joined with an adhesive or the like, the first member An air chamber 3320 is formed.

  A front surface 3322a of the cover member 3322 includes a through hole 3322b (see FIG. 4B). The front surface 3322a of the cover member 3322 includes an insertion piece 3322c into which the other end of the tube member 3310 is inserted. The insertion piece 3322 c has an inner diameter substantially equal to the outer diameter of the tube member 3310. The insertion piece 3322c is formed so that the axis of the inserted tube member 3310 and the central axis of the through hole 3322b are arranged on substantially the same axis. Thus, the first air chamber 3320 functions as an adapter for communicating the other end of the tube member 3310 to the first hole 3210 and the through hole HL. The resonance frequency can be adjusted by adjusting the volume and shape of the first air chamber 3320, whereby the sound quality of the sound emitted to the back side of the speaker unit 310 can be adjusted. For example, sound in a predetermined frequency band can be increased or decreased.

  The second air chamber 3330 is formed so as to surround the second hole 3220. The second air chamber 3330 has a hollow box shape.

  Specifically, the second air chamber 3330 is connected to the side portion 321 of the housing 320, the bottom portion 322 of the housing 320, the side portion 321 and the bottom portion 322 as shown in FIG. And a cover member 3332 having a substantially L-shaped cross section.

  The locking piece 3331 has a claw projecting inwardly at the tip. When the cover member 3332 is inserted between the locking pieces 3331 so that the rear surface 3332a of the cover member 3332 is hooked on the claw portion of the locking piece 3331 and the members are joined with an adhesive or the like, the second An air chamber 3330 is formed.

  The rear surface 3332a of the cover member 3332 includes a through hole 3332b. In the through hole 3332b, a flow rate adjusting member 3333 shown in FIG. 4B or the like is provided so as to cover it.

  The flow rate adjusting member 3333 adjusts (decreases) the flow rate of air that passes through the second hole 3220 from the internal space of the housing 320 via the second air chamber 3330. As the flow rate adjusting member 3333, for example, paper, Himeron, or the like can be used. A hole for adjusting the flow rate may be formed in the flow rate adjusting member 3333. The flow rate adjusting member 3333 is provided on the back surface of the rear surface 3332 a of the cover member 3332. That is, the flow rate adjusting member 3333 is attached so as to close the front side of the through hole 3332b. In this way, the second air chamber 3330 functions as a flow rate reducing unit that reduces the flow rate of air that passes through the second hole 3220 formed as the insertion hole for the pin 211 of the band unit 200 by the flow rate adjusting member 3333.

  Therefore, when the sound output unit swings, for example, the flow rate is such that the gap area between the pin 211 of the band unit 200 and the second hole 3220 does not change and the sound quality in the low frequency range does not change. The material of the flow rate adjusting member 3333, the area of the through hole 3332b covered by the flow rate adjusting member 3333, and the like can be adjusted.

  As shown in FIG. 2 and the like, the holder 340 includes a ring member 3420 in which a hole 3410 having an inner diameter slightly smaller than the outer diameter of the speaker unit 310 is formed. The ring member 3420 includes a plurality of engaging claws 3421 at point-symmetric positions. The engaging claw 3421 is formed to protrude toward the baffle 350 side.

  The baffle 350 is fixed so as to cover the opening (side) of the housing 320. The baffle 350 is fixed to the housing 320 with a bolt 600 via a packing 800. The baffle 350 includes a plurality of through holes 3510. The baffle 350 includes a recess 3520. As shown in FIGS. 3B and 4B, the recess 3520 includes a first recess 3520a in which the speaker unit 310 is accommodated and a second recess 3520b in which the holder 340 is accommodated.

  When the speaker unit 310 is accommodated, the first recess 3520a has a depth at which the upper edge of the outer periphery of the speaker unit 310 and the upper edge of the first recess 3520a are substantially equal in height. In addition, the first recess 3520a is slightly larger than the outer periphery of the speaker unit 310 so that the outer peripheral side surface of the speaker unit 310 and the inner peripheral surface of the first recess 3520a do not interfere when the speaker unit 310 is accommodated. Has a large inner circumference. The bottom of the first recess 3520a includes a pedestal 3530 on which the bottom of the speaker unit 310 is placed.

  Second recess 3520 b has an inner circumference slightly larger than the outer circumference of ring member 3420 of holder 340, and has a depth substantially equal to the thickness of ring member 3420. The second recess 3520 b includes an engagement hole 3550 so as to correspond to the engagement claw 3421 of the holder 340.

  As a result, the speaker unit 310 is accommodated in the first recess 3520a of the baffle 350, the speaker unit 310 is placed on the pedestal 3530, and the engagement claw 3421 of the holder 340 is engaged with the engagement hole 3550 of the baffle 350. When combined, the outer peripheral upper portion of the speaker unit 310 is sandwiched and fixed between the base 3530 of the first recess 3520a and the ring member 3420 of the holder 340. At this time, since the second recessed portion 3520b has a depth substantially equal to the thickness of the ring member 3420 of the holder 340, the surface of the baffle 350 and the surface of the ring member 3420 of the holder 340 are substantially flush with each other.

  As shown in FIG. 3B and FIG. 4B, the sound absorbing material 360 is a space between the flange 322 tb and the baffle 350 in the housing 320 and between the bottom 322 of the housing 320 and the sound quality adjusting mechanism 330. Placed in. These sound absorbing materials 360 are appropriately set in arrangement, insertion amount, and the like in the acoustic processing as described above.

  The ear pad 370 includes an annular member 3710 that substantially adheres to the user's head and prevents sound leakage from the speaker unit 310, and a protective film 3720 that prevents dust from entering the speaker unit 310 and the like.

  The cylindrical member 380 forms a space between the speaker unit 310 and the protective film 3720 of the ear pad 370 so that sound from the speaker unit 310 is not substantially dispersed in the middle of reaching the protective film 3720 of the ear pad 370. As the tubular member 380, for example, a sponge or the like can be used.

  The covering member 390 covers the through hole 3510 of the baffle 350 in order to prevent sound leakage from the internal space of the housing 320 formed on the back side of the speaker unit 310 and to adjust the pressure in the internal space. As the covering member 390, for example, paper or the like can be used.

  The cover member 400 covers the side part 321 and the bottom part 322 of the housing 320. The cover member 400 is formed of a material different from that of the housing 320 so that a gap is formed between the side portion 321 and the bottom portion 322 of the housing 320 so as not to interfere with the housing 320. The side portion of the cover member 400 includes a notch portion 410a so that the pin 211 of the band portion 200 can be satisfactorily inserted into the insertion hole of the housing 320. Further, the lower portion of the cover member 400 is also provided with a notch 410b so as not to interfere with the bushing 700 provided in the housing 320.

The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.
In the above embodiment, the other end portion of the tube member 3310 is communicated with the through hole HL via the first air chamber 3320, but this is not restrictive. That is, the other end portion of the tube member 3310 may be directly communicated with the through hole HL.
In the above embodiment, the second air chamber 3330 is provided as the flow rate reducing portion, but it is omitted if the gap between the pin 211 of the band portion 200 and the second hole 3220 can be formed relatively uniformly. May be.
In the above embodiment, the tube member 3310 has a shape that is not substantially curved, but may be curved.
In the above embodiment, the other end of the tube member 3310 is communicated with the through hole HL formed on the rear side of the housing 320, but is communicated with the second hole 3220 formed on the front side of the housing 320. May be. That is, the sound output unit 300 may have a configuration in which front and rear are reversed. In this case, the sound leaks out from the second hole 3220. As described above, the sound having a desired frequency with respect to the sound entering from one end of the tube member 3310 is substantially attenuated in the tube member 3310. Since only the sound that has not been attenuated leaks to the outside, the sound leaking from the second hole 3220 is extremely small.

100 Headphone 200 Band part, 210 hanger, 211 pin 300 Sound output part 310 Speaker unit 320 Housing, 321 side part, 322 Bottom part, 3210 1st hole, 3220 2nd hole 330 Sound quality adjustment mechanism, 3310 Tube member, 3320 1st 1 air chamber, 3321 locking piece, 3322 cover member, 3322a front surface of cover member, 3322b through hole, 3322c insertion piece, 3330 second air chamber, 3331 locking piece, 3332 cover member, 3332a cover member 3332b through hole, 3333 flow rate adjusting member 340 holder, 3410 hole, 3420 ring member, 3421 engaging claw 350 baffle, 3510 through hole, 3520 recessed part, 3520a first recessed part, 3520b second Recessed part, 3530 pedestal 3550 Engagement hole 360 Sound absorbing material 370 Ear pad, 3710 Ring member, 3720 Protective film 380 Tubular member 390 Cover member 400 Cover member 410a, 410b Notch 500 Signal cable 600 Bolt 700 Bushing S1, S2, S3 Space BC Internal space HL Through hole

Claims (5)

A speaker unit;
A housing having a first hole that forms an internal space on the back side together with the speaker unit, and communicates the internal space and the external space;
An annular tube member disposed in the internal space, and having a first space in which one end side is communicated with the first hole and the other end side is opened in the internal space; Prepared,
The tube member is arranged to partition the internal space into a second space and a third space ,
The first hole is a headphone formed on the rear side of the head of the housing when the user uses the first hole .   The headphone according to claim 1, wherein the tube member has a straight tubular shape.   The headphone according to claim 1, wherein the second space and the third space are subjected to different acoustic processing. One end portion, a headphone according to any one of claims 1 to 3 communicate with each other through the air chamber into the first hole of the tube member. A speaker unit;
An internal space is formed on the back side of the speaker unit together with the speaker unit, and a first hole for communicating the internal space and the external space is formed on the front side of the head when used by the user. A housing having a second hole communicating with the space ;
An annular tube member disposed in the internal space, having a first space inside which one end portion is communicated with the first hole and the other end side is opened in the internal space;
A flow rate reducing portion for reducing the flow rate of air passing through the second hole;
With
The tube member is a headphone arranged to divide the internal space into a second space and a third space.

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