JPH07170588A - Electroacoustic transducer - Google Patents

Abstract

PURPOSE:To provide an electroacoustic transducer which prevents the sound leakage and to suppress the deterioration of the bass by improving the attachment of the transducer to the recessed part of the auricles by arranging the electroacoustic transducer element at the side of the acoustic meatus from the center of the concha cavity. CONSTITUTION:A ring member 1 which makes the asynmetrical shape for the conduction direction of a code 17 for the external connection from a housing 16 which constructs the transducer is attached to the housing 16. The swollen part of the ring member 1 is mounted at the antitragus side of the concha cavity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroacoustic transducer such as an earphone which is used by mounting it in a recess in an auricle, and more particularly to an electroacoustic transducer with improved sound leakage.

[0002]

2. Description of the Related Art Heretofore, so-called inner ear type earphones have been proposed which are used by being mounted in a recess in the auricle. FIG. 10 shows an example thereof.

In the figure, 16 is a housing,
Inside the housing 16, a driver unit (electroacoustic conversion element) 15 including a diaphragm, a magnetic circuit and the like is housed. Reference numeral 18 is a cord holding portion that holds the cord 17 for external connection from the driver unit 15. The cord holder 18 extends from the housing 16.

The housing 16 is, as shown in FIG.
An ear that is formed to have a size that can be fitted into the concha cavity b which is a concave portion of the auricle a, and has at least two points on the outer peripheral surface that are part of the auricle a when fitted into the concha cavity b. It is formed so that it can be supported by the beads c and the beads d.

When the housing 16 is fitted in the concha cavity b, the housing 16 faces outward from the auricle a.
The rear peripheral portion of is formed as a tapered inclined portion 19. The inclination angle of the inclined portion 19 is set so as to substantially correspond to the curved rising surface of the concha cavity b.

The cord holding portion 18 extending from the housing 16 is extended downward from the lower end side of the rear side end surface 20 of the housing 16 so as to be substantially parallel to the rear side end surface 20. The tragus c and the antitragus d, which are the support points for supporting the housing 16 when fitted in the cavity b
It is provided so as to come into contact with a point P _{3 on} the outer surface of the ear lobe e at a position below the points P ₁ and P ₂ at the tip of the.

Reference numeral 21 is a ring having flexibility and elasticity, which is used for the driver unit 15 and the housing 16.
It is fitted to the joint part with. Reference numeral 22 is a protective plate disposed on the front surface of the diaphragm of the driver unit 15.

According to the earphone thus configured,
As shown in FIG. 11, since it is attached to the concha cavity b by the support structure of the three points P _{1 to} P ₃ , it is possible to hold the ear canal stably and surely in a part of the auricle a without pressing it. it can.

Further, in the conventional earphone having the above-mentioned structure, sound is leaked from the gap between the concha of the ear b and the housing 16 to lower the low frequency reproduction capability, and the wearability of the earphone varies depending on the individual size. An earphone for improving badness is disclosed in Japanese Patent Laid-Open No. 63-
It is disclosed in Japanese Patent No. 38398.

That is, in this publication, the ring portion to be mounted on the housing for fixing the circumferential direction of the diaphragm of the earphone is made of an elastic foamed polymer or the like to have an elliptical shape that matches the concha length and the concha width. Sound leakage is reduced and low-pitched sound reproduction is possible.

[0011]

By the way, the earphone configured as shown in FIG. 10 has a size suitable for, for example, a person with the smallest ear so that anyone can fit. Therefore, there are disadvantages that it is too small for a person with big ears, the airtightness is not good, the low frequency range is lowered, and good acoustic characteristics cannot be obtained.

[0012] To prevent such adverse effects, as disclosed in the above-mentioned publication, the ring 21 is formed into an elliptical shape so as to match the concha length and the concha width and fitted into the concha space b. When combined, the sealability can be increased to some extent to compensate for the lowering of the low frequency range, but the entrance of the external auditory meatus of the human ear is located not on the center of the concha cavity b but on the tragus c side. There is. Therefore, if the ring 21 is made to match the length of the concha and the width of the concha, the position of the electroacoustic transducer is not brought to the center position of the entrance of the ear canal and the lowering of low frequency sound is more completely suppressed. There is a problem that it is not possible to prevent sound leakage and improve the hermeticity.

The present invention is intended to provide an electroacoustic transducer in which such problems are solved. The object of the present invention is to provide a ring portion on the housing on the side of the auricle d of the auricle a. The ring member 1 bulges out in one direction from the center of the housing body, that is, the ring member 1 is asymmetrical with respect to the direction in which the external connection cord 17 is drawn out, so that the mountability and the airtightness are further enhanced, and the low range is lowered It is designed to suppress more.

[0014]

The electroacoustic transducer of the present invention, as an example of which is shown in FIGS. 1 and 2, is capable of accommodating an electroacoustic transducer and accommodating it in the concha of the ear. A housing 16 having a shape, an external connection cord 17 led out from the housing 16, and an elastic ring member 1 attached to the outer peripheral portion of the housing 16 are provided. The shape is asymmetrical with respect to the direction in which the external connection cord is led out from the center.

[0015]

According to the electroacoustic transducer of the present invention, the ring member fitted to the outer periphery of the housing has a shape asymmetrical with respect to the direction in which the external connection cord is led out from the center of the housing body. Since the acoustic conversion element is located closer to the entrance of the external auditory meatus than the center of the concha of the concha, the airtightness is further enhanced and it is easy to fit, sound leakage is prevented, and lowering of low frequency sound can be suppressed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, parts corresponding to those in FIG. 10 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the ring member 1 having elasticity at the joint between the housing 16 and the driver unit 15.
Is fitted.

As shown in FIGS. 3 and 4, the ring member 1 has a shape in which the center positions of the inner circle and the outer circle are displaced. That is, the shape is such that it bulges in one direction from the center. In this ring member 1, an inner peripheral side base ring portion 2 and an outer peripheral side elastic ring portion 3 are formed by, for example, two-color molding (double molding).

The base ring portion 2 is molded using a material having sufficient hardness, such as polycarbonate. The base ring portion 2 is formed to have a circular base portion 2a and three leg portions 2b having a claw portion 2c at the tip. On the other hand, the elastic ring portion 3 is formed by using a material having high elasticity, for example, silicon. This elastic ring part 3
Is hollow except for a portion corresponding to the leg portion 2b of the base ring portion 2.

Such a ring member 1 is fitted so that the base portion 2a of the base ring portion 2 is located on the protective plate 22 side. In this case, the base portion 2a is locked to the protective plate 22 and the claw portion 2c is locked to the flange portion 16a of the housing 16. Further, the ring member 1 is arranged so that its bulging direction is on the side of the traverse d.

1 and 2 show an earphone for the left ear. Although not shown, the earphone for the right ear has the bulging direction opposite to this.

The earphone constructed as in this example is shown in FIG.
As shown in FIG. 3, the needle is inserted into the concha cavity b and used. Here, the entrance of the external auditory meatus is not located in the center of the concha cavity b but on the tragus c side. According to this example, the housing 16
The ring member 1 having elasticity so as to be bilaterally asymmetrical with respect to the direction in which the external connection cord 17 hung from the rear end face 20 (see FIG. 11) of the auricle a of the auricle a is d.
Since it has a shape that bulges to the side, it is easy to fit when wearing the earphone, and the electroacoustic transducer is closer to the entrance of the external auditory meatus than the center of the concha cavity b, so that the sealing performance can be improved and sound leakage can be prevented. It can be prevented. As a result, it is possible to suppress lowering of the low frequency range and obtain good acoustic characteristics.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7, parts corresponding to those in FIG. 10 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, the ring member 1 having elasticity at the joint between the housing 16 and the driver unit 15 is shown.
0 is fitted.

As shown in FIGS. 8 and 9, the ring member 10 has a shape in which the center positions of the inner circumference circle of the base ring portion 12 and the outer circumference circle of the elastic ring portion 13 are displaced.
That is, the base ring portion 12 has a shape that bulges in the anti-dangle direction from the center, that is, a shape that is asymmetrical with respect to the direction in which the external connection cord 17 is led out. In this ring member 10, a base ring portion 12 on the inner peripheral side and an elastic ring portion 13 on the outer peripheral side are, for example, two-color molded (double molded).
Is formed by.

The base ring portion 12 is formed of a material having sufficient hardness, such as ABS (acrylonitrile-butadiene-styrene copolymer resin). The base ring portion 12 is formed in a cylindrical shape having an edge portion 12a. On the other hand, the elastic ring portion 13 is made of a material having a high elastic force,
For example, it is molded using urethane.

The ring member 10 is fitted in such a manner that the edge portion 12a of the base ring portion 12 is located on the protective plate 22 side. In this case, the edge portion 12a is locked to the protective plate 22. Further, the ring member 10 is arranged so that the bulging direction thereof is the antitragus d side when the ring member 10 is inserted into the concha of the ear b. Figure 6
And FIG. 7 shows an earphone for the left ear. Although not shown, the earphone for the right ear has the bulging direction opposite to this.

The earphone configured as in this example is also shown in FIG.
It is used by inserting it into the concha cavum b like the embodiment shown in FIG.

Also in this example, the ring member 10 having asymmetric elasticity with respect to the direction in which the external connection cord is led out from the center of the housing body along the cord holding portion.
Since it has a shape that bulges to the side of the tragus d, it is easy to fit when wearing the earphone, and the electroacoustic transducer is located closer to the entrance of the external auditory meatus than the center of the concha cavity b, so that the sound tightness is improved. Leakage can be prevented, and the same effect as that of the above-described embodiment can be obtained.

In the above embodiment, the ring members 1 and 10 have a shape in which the center positions of the inner circumference circle and the outer circumference circle are displaced, but the outer circumference shape may have other shapes such as an ellipse. It may be provided, and the point is that the shape should be left-right asymmetrical with respect to the external connection cord lead-out direction, such as a shape that bulges in one direction from the center.

[0031]

According to the present invention, the outer peripheral portion of the housing is elastic in a laterally asymmetrical shape with respect to the direction in which the external connecting cord drawn out from the center of the housing body along the cord holding portion is led out. Since the ring member that it has is attached, it is easy to fit at the time of wearing, and the electroacoustic transducer is located closer to the entrance of the ear canal than the center of the concha cavity, so that sound leakage can be prevented and sealing can be improved. This makes it possible to suppress the lowering of the low frequency range and obtain good acoustic characteristics.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an electroacoustic transducer of the present invention.

FIG. 2 is a side sectional view showing an embodiment of the electroacoustic transducer of the present invention.

FIG. 3 is a plan view of a ring member used in the electroacoustic transducer of the present invention.

FIG. 4 is a perspective view of a ring member used in the electroacoustic transducer of the present invention.

FIG. 5 is a state diagram in which the electroacoustic transducer of the present invention is mounted in the auricle.

FIG. 6 is a plan view showing another embodiment of the electroacoustic transducer of the present invention.

FIG. 7 is a side sectional view showing another embodiment of the electroacoustic transducer of the present invention.

FIG. 8 is a plan view of a ring member used in an electroacoustic transducer according to another embodiment of the present invention.

FIG. 9 is a perspective view of a ring member used in an electroacoustic transducer according to another embodiment of the present invention.

FIG. 10 is a side view of a conventional electroacoustic transducer.

FIG. 11 is a diagram showing how the conventional electroacoustic transducer is attached to the auricle.

[Explanation of symbols]

 1,10,21 Ring member 2,12 Base ring part 3,13 Elastic ring part 15 Driver unit 16 Housing 17 External connection cord 18 Cord holding part 22 Protective plate

Claims (1)

[Claims] 1. A housing having a shape for accommodating an electroacoustic conversion element and capable of being accommodated in the concha of the ear, an external connection cord led out from the housing, and an elasticity attached to an outer peripheral portion of the housing. An electroacoustic transducer, wherein the ring member has a laterally asymmetric shape with respect to a direction in which the external connection cord is led out from the center of the housing body.