JPH0810999Y2 - Inner ear headphones - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an inner ear type headphone in which a housing accommodating a driver unit is inserted into an ear canal for use.

[Prior Art] Fig. 12 shows an example of an inner ear type headphone used in various audio equipment.

In the figure, reference numeral 1 denotes a housing, and the front surface side (left side in FIG. 12) of the housing 1 is open, and has a substantially bowl shape. The driver unit 2 is housed in the housing 1.

3 is a yoke which has a circular recess and also serves as a frame,
Reference numeral 4 is a circular magnet, and 5 is a disk-shaped ball plate (ball piece), which form a magnetic circuit.

Reference numeral 6 denotes a vibrating plate, and an end portion of the vibrating plate 6 is fixed to an outer peripheral portion of the yoke 3 and one end of a boil coil bobbin 7 around which a voice coil is wound is connected to a central portion thereof. The voice coil bobbin 7 is movably arranged between the ball plate 5 and the yoke 3.

Reference numeral 8 is a protective plate, and 9 is a ring-shaped member for fixing the driver unit 2 to the housing 1.

An opening 10 is formed in the flange portion of the yoke 3 of the driver unit 2, and an opening 11 is also formed in the rear surface side of the housing 1. The acoustic resistor 12 is attached to the inner surface of the housing 1 corresponding to the opening 11.

FIG. 13 shows an acoustic equivalent circuit of the inner ear type headphones shown in FIG. In the figure, mo: Equivalent mass of diaphragm so: Equivalent stiffness of diaphragm ro: Equivalent resistance of diaphragm ml: Equivalent mass due to leakage between inner ear headphones and ear canal rl: Equivalent due to leakage between inner ear headphones and ear canal Resistance sc: Inner-ear type equivalent stiffness of volume formed by headphones and ear canal s1: Equivalent stiffness of housing volume r1: Acoustic resistance connecting the housing and the outside air F: Driving force of voice coil by signal current Inner-ear type in Fig. 12 When the headphones are inserted into the ear canal, a gap may be formed between the inner ear type headphones and the ear canal depending on the size of the user's ear canal.

If such a gap is formed, there is a disadvantage that the reproduced sound leaks and the low frequency characteristic is deteriorated.

In the acoustic equivalent circuit shown in Fig. 13, this is ml, rl
This is because the leakage impedance represented by is lower than the impedance represented by sc, and the impedance of these parallel circuits is almost only rl particularly in the low frequency range.

To remove such deterioration of low frequency characteristics, for example,
The gap between the inner ear type headphones and the ear canal is reduced to reduce the leakage of reproduced sound, and the equivalent resistance rl
Should be increased.

Therefore, as shown in FIG. 14, it has been proposed to mount an ear pad 20 made of, for example, urethane foam (foamed plastic) so as to cover the front surface and the side surface of the housing 1.

That is, when the ear pad 20 is attached, the leakage of reproduced sound from the ear canal to the outside is reduced, the equivalent resistance rl can be increased, and the deterioration of the low frequency characteristic can be reduced.

[Problems to be Solved by the Invention] By mounting the ear pads 20 in this way, deterioration of low-frequency characteristics can be reduced, but the ear pads 20 also cover the front side of the housing 1. Therefore, there is a disadvantage that the reproduced sound does not efficiently reach the external auditory meatus of the ear.

Therefore, it is an object of the present invention to eliminate the discomfort of wearing and to alleviate the deterioration of low-frequency characteristics due to the leakage of reproduced sound from the ear canal to the outside without any inconvenience.

[Means for Solving the Problems] According to the present invention, a ring-shaped pad 20 is arranged on the outer peripheral surface of a side surface of a housing 1 in which a driver unit 2 is housed, and the ring-shaped pad 20 has a soft outer peripheral surface.
It is characterized in that a plurality of protrusions 22 having a substantially rectangular cross section are formed at high density.

[Operation] In the above configuration, the ring-shaped pad 20 is formed on the outer surface of the side surface of the housing 1 in which the driver unit 2 is housed.
Are arranged, and on the outer peripheral surface of the ring-shaped pad 20, a plurality of soft protrusions 22 having a substantially rectangular cross section are formed at high density. The protrusion 22 inserts the inner wall of the ear canal in close contact with the inner wall of the ear canal. As a result, the projection 22 fills the gap, and the leakage of reproduced sound from the ear canal to the outside is reduced.

Further, since the front side of the housing 1 is not covered, the reproduced sound efficiently reaches the external auditory meatus of the ear, and the high frequency characteristic is not deteriorated.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIG. In FIG. 1 and subsequent figures, the parts corresponding to those in FIG. 12 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this example, the ring-shaped pad 20 is mounted on the peripheral surface of the ring-shaped member 9 provided for fixing the driver unit 2 to the housing 1.

As shown in FIG. 2, the ring-shaped pad 20 is composed of a ring-shaped main body 21 having a predetermined thickness and a plurality of protrusions 22 having a high density formed on the outer peripheral surface thereof. It

The protrusion 22 is formed so as to have elasticity to some extent in order to eliminate discomfort when the ear canal is attached. for that reason,
As shown in FIG. 2, it has a predetermined width and a rectangular cross section, and is formed so as to be parallel to the ear canal mounting direction and at a predetermined interval.

The size of the protrusion 22 is 1 to 2 mm in height and 3 to 5 mm in length.
It is preferably formed to a certain degree. As the material, a soft material such as silicon rubber can be used.

The ring-shaped pad 20 having the flexible protrusions 22 in this manner
When the user inserts the housing 1 into the ear canal, the protrusion 22 fills the gap between the ear canal and the pad body 21, and the leakage of the reproduced sound from the ear canal to the outside is reduced.

Therefore, according to this example, it is possible to reduce the deterioration of the low-frequency characteristic. Further, according to this example, since the front surface side of the housing 1 is not covered, it is possible to allow the reproduced sound to reach the external auditory meatus of the ear more efficiently than in the example of FIG.

The above-mentioned protrusion 22 is formed in a band shape, but this is merely an example, and a protrusion having a shape as shown in FIGS. 4 to 9 may be used.

FIG. 4 is a modified example of FIG. 1 and shows a case where the strip-shaped protrusion 22 is formed by being divided into two parts. FIG. 3 shows a cross-sectional view of the ring pad 20 of FIG. In this way, the protrusion 22 may be formed in a slightly inclined state so that a certain amount of frictional force acts after attachment and it is difficult to remove it.

The example of FIG. 5 is a case where the array of the divided strip-shaped projections 22 is slightly shifted.

The example of FIG. 6 is a case where the strip-shaped protrusions 22 are formed over several rows in the direction orthogonal to the ear canal mounting direction.

FIG. 7 shows a modified example of FIG. 6, in which the formation position of the band-shaped protrusion 22 is slightly shifted as shown in FIG.

FIG. 8 shows a case where the band-shaped projection 22 is formed so as to be oblique with respect to the mounting direction.

FIG. 9 shows the case where the projection 22 formed in a column shape instead of the band shape is used, and in this case, a large number of projections 22 are used. In that case, the ring-shaped pad 20 is mounted as shown in FIG.

The above shape is merely an example, and the shape, arrangement position, size, etc. can be variously changed.

FIG. 11 shows still another example of the present invention, in which the ring-shaped pad 20 is formed integrally with the ring-shaped member 9 in this example. Others are configured similarly to the example in FIG.

The protrusion 22 used in this case can be variously modified as described above.

[Effects of the Invention] As described above, according to the present invention, the ring-shaped pad is arranged on the outer surface of the side surface of the housing in which the driver unit is housed, and the outer surface of the ring-shaped pad has a soft, cross-section. In which a plurality of protrusions having a substantially rectangular shape are formed with high density. According to this, it is possible to satisfactorily reduce the deterioration of the low frequency characteristic due to the leakage of the reproduced sound from the ear canal to the outside without hindering the reproduction sound from reaching the ear canal of the reproduced sound.

[Brief description of drawings]

1 to 11 are block diagrams showing an embodiment of the present invention,
Fig. 12 shows the configuration of an example of earbud headphones.
FIG. 13 is a diagram showing the acoustic equivalent circuit, and FIG. 14 is a configuration diagram of a conventional example. 1 …… Housing 2 …… Driver unit 9 …… Ring member 20 …… Ring pad 21 …… Main body 22 …… Projection

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped pad is arranged on the outer peripheral surface of a side surface of a housing in which a driver unit is housed, and the ring-shaped pad has a plurality of soft projections formed on its outer peripheral surface and having a substantially rectangular cross section. The inner ear type headphones are characterized by being formed with high density.