JPS60173995A - Ear speaker - Google Patents

Abstract

PURPOSE:To obtain a small sized, high performance ear speaker that provides superior sense of handling by providing two sound hole groups and by constituting it so that a group of sound holes may be located at the entry part of the external auditory canal when the device is put on. CONSTITUTION:A magnetic circuit 1 and a diaphragm 2 constitute a speaker unit, which is built in a case consisting of a rear case 3 and a front case 4. The case-4 is formed more in a semispheric shape than that of the diaphragm 2 in front part and the case 4 has the first sound group 5 away from the tip point A where a central axis B, has a contact with the sphere. The case 4 has also the second sound hole group 6 over the perimeter of the sphere side face adjacent to the diaphragm 2. The group 5 efficiently sends the sound from the diaphragm 2 to the external auditory canal entrance, with directivity, and the group 6 can allow unnecessary sound to escape efficiently out of the ear concha.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ear speaker configured to attach a speaker to the pinna of the ear and listen to sound from the speaker.

Conventional configurations and their problems Ear speakers, which have traditionally been configured so that the speaker is attached to the auricle and the sound from the speaker is heard, are classified according to the way the speaker is attached to the auricle, such as how it applies spill force to the auricle. There are various types. There is a type of headphone that has a speaker unit pressed against the auricle and held by the elasticity of a headband. However, with these headphones, a large pressure builds up on the auricle in the head region of the ear, making it difficult to wear them for long periods of time. Furthermore, due to the structure in which the speaker unit is placed on the pinna of the ear to listen to sound, a space is created between the entrance of the ear canal and the speaker unit, and the air chamber capacity is large. It cannot be said that the efficiency is high because only the internal organs are supplied to the external auditory canal. In fact, the function of this air chamber as an acoustic circuit, and the reflections on the speaker unit and the surface of the auricle affect the acoustic characteristics, making the design in terms of determining sound quality complicated and difficult to put together as a product. It was also a contributing factor.

There are also earphones that use earplugs that act as sound tubes and are inserted into the ear canal. However, it is unstable to wear and easy to remove, and if you want to hold it firmly, you have to forcefully insert the earplug into the ear canal, which also makes it difficult to wear it for a long time. However, since the structure radiates sound through an acoustic tube, it has the disadvantage that it is difficult to improve the acoustic characteristics.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate such conventional drawbacks and to provide an ear speaker that is small in size, has high performance, and is easy to use.

Structure of the Invention In order to achieve the above object, the ear speaker of the present invention includes a half-half on the diaphragm side of the speaker unit so that the case containing the speaker unit can be attached to the recess of the concha cavity of the auricle. By arranging the first sound hole group that emits sound from the diaphragm in a circular spherical shape and concentrating it at a position away from the tip of the central axis of the hemispherical surface, these first sound hole groups are not exposed when worn. The sound generated by the diaphragm located at the entrance of the ear canal is directed and efficiently radiated from the sound hole to the external auditory canal, and a second group of sound holes is provided around the side surface of the hemispherical surface. The device is characterized in that it allows excess sound other than that directly radiated into the ear canal to escape to the outside of the auricle, thereby being compact and having a broadband frequency characteristic. be.

DESCRIPTION OF THE EMBODIMENTS Fig. 1 is a perspective view showing an embodiment of the ear speaker of the present invention, and Fig. 2 is a sectional view of the ear speaker viewed from above, along with a portion of the auricle broken when the ear speaker is attached to the auricle. It is. In FIGS. 1 and 2, 1 is a magnetic circuit, which has a magnetic gap and a voice coil disposed in the magnetic gap, and an alternating current signal is passed through the voice coil, and a diaphragm connected to the voice coil is connected to the voice coil. Vibrate 2. magnetic circuit 1
The whole including the diaphragm 2 and the diaphragm 2 is called a speaker unit.

The speaker unit is built into a case composed of a rear case 3 and a front case 4.

The front case 4 has a hemispherical shape in front of the diaphragm 2. A first sound hole group 5 is bored in the front case 4 at a point away from a point A where the central axis B1 intersects with the spherical surface, that is, a point A at the most extreme point. In other words, the first sound holes 6 are drilled on the hemispherical surface so as to be centered at -B2, which forms a certain angle from the center of the spherical surface to the central axis. Furthermore, a second sound hole group 6 is bored in the case 4 around the spherical side surface near the diaphragm 2.

The ear speaker with the above-mentioned configuration is attached to the auricle shown in Fig. 3, but the auricle has a recessed part called the concha cavity just before the entrance of the external auditory canal (auricular canal) a, and the conchal cavity is located at the back of the head. It is expanding to There is still the tragus C at the base of the temporal region, and the antitragus d is located across the concha cavity from the tragus C, and eventually the tragus C and the antitragus d connect the entrance to the external auditory canal a and the ear. The concha cavity is stepped. The shape of the tragus C2 and the tragus d and Tl concha cavities is mainly formed by cartilage, which is surrounded by surface tissues such as skin that have surface elasticity, and as a whole exerts bending elastic force. have

Therefore, when the ear speaker described above is inserted and worn in the concha cavity of the auricle, the tip A of the front case 4 hits the wall of the concha cavity, and the front end A of the front case 4 hits the wall of the concha cavity, and the ear speaker is placed at a certain angle from the center of the sphere. Axis B
The entrance to the external auditory canal a is located near the intersection of the spherical surface and the spherical surface. By preferably providing this axis B2, the first
The sound hole group 6 can be aligned with the entrance of the external auditory canal a.

This allows the sound from the diaphragm 2 to be directed to the entrance of the external auditory canal a. Furthermore, the second sound hole group 6, which is formed around the spherical side surface of the front case 4 near the diaphragm 2, is located inside the outermost diameter of the front case 4 due to the radius of the spherical surface. , the tragus C2 rarely contacts the wall surface of the tragus d, and the concha cavity is open in the parietal direction, so the sound emitted from the 20th sound hole group tends to exit the auricle.

Due to the above, the sound generated from the diaphragm 2 and the sound hole group 6
Sounds other than those supplied to the entrance of the external auditory canal a, that is, sounds reflected within the spherical surface of the front case 4 and sounds that deviate from the directional characteristics of the axis B2, are transmitted to the outside of the auricle through the second sound hole group 6. It is possible to escape efficiently and obtain flat frequency characteristics over a wide band. On the other hand, since some of the sounds surrounding the listener enter through the second sound hole group 6, conversations and surrounding sounds can be heard, which is also beneficial for safety. Furthermore, when the ear speaker of this embodiment is inserted and worn in the concha cavity as described above, the wall surface of the concha cavity hits near point A of the spherical surface of the tip, and because of the spherical surface, there is no feeling of contact. It is soft and does not need to be covered with a commonly used porous elastic material (urethane foam is a typical example), which has the advantage of improving sound transmission.

It is also possible to provide the first sound hole group 6 at the tip end of the hemispherical front case 4, but as mentioned above, the spherical tip end hits the wall of the concha cavity. If there were a hole there, the contact feeling would not be good, and the sound hole would be located close to the entrance of the external auditory canal a, resulting in poor directivity characteristics.

When the ear speaker of this embodiment described above is inserted and worn in the concha cavity of the auricle, it is almost retained due to the concave cavity of the auricle, but the retention is more secure. For this reason, the conventional headband 10 is shown in FIG.
The headband 10 is attached to the tip of the ear speaker 11 of this embodiment via the bottom protrusion (7 in FIG. 2).
There is a method of applying compression to the cranial side using the elastic force of When the ear speakers 11 are attached to both ends of the headband 10 in this manner, the lateral pressure of the headband 10 is auxiliary, so it is natural that it may be less than the conventional hesophone suppression.

In addition, as another dimension to ensure retention in the installed state, a ring-shaped pad 12 made of porous elastic material (urethane foam, etc.) is glued around the side and bottom of the rear case 3, as shown in FIG. Another possible method is to do so. By providing the pad 12 in this way, when the ear speaker is inserted into the concha cavity of the auricle, the pad 12 hits the tragus C and the tragus d, and as described above, the pad 12 hits the tragus C and the tragus d. Since d has elasticity, it combines with the elasticity of the pad 12 to provide compression and improve the attachment retention force.

Effects of the Invention As described above, according to the present invention, the front surface is hemispherical so that the case housing the speaker unit is attached to the recess of the concha cavity of the auricle, and the 10th sound hole group is centered on the case. By concentrating the holes on a spherical surface centered on an axis that is deviated from the axis by a certain angle, the sound from the diaphragm can be directed and efficiently sent to the entrance of the external auditory canal. Furthermore, by opening the 20th sound hole group around the spherical side surface near the diaphragm, unnecessary sound can be efficiently released outside the auricle.
As a result, an ear speaker with a wide band and flat frequency characteristics can be realized in a hut.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the ear speaker of the present invention, Fig. 2 is a cross-sectional view from the top along with a portion of the broken auricle when the ear speaker is worn, and Fig. 3 is a cross-sectional view from the head. Figure 4 is an external view of the auricle, Figure 4 is an external view of one embodiment of the ear speaker that makes it more secure to hold the ear speaker in place, and Figure 5 is another example of the ear speaker that makes it more secure to hold the ear speaker in place. It is a sectional view showing an example. 1... Magnetic circuit, 2... Vibration plate, 3...
- Rear case, 4... Front case, 5... First sound hole group, 6... Second sound hole group, a... External auditory canal, b...・Concha cavity, C...Tragus, d・
...Tamazu, 10...Headpan)', 12
······Pat. Name of agent: Patent attorney Toshio Nakao and 1 other person No. J
13 Figure 4 Figure 5

Claims (3)

[Claims] (1) A case with a built-in speaker unit having a diaphragm and a group of sound holes that emits sound caused by the vibration of the diaphragm is placed between the tragus and the antitragus just before the external auditory canal of the auricle. A first sound hole group is formed in a hemispherical shape on the side of the diaphragm so that it can be installed in a recessed part of a cavity, and the sound hole group is concentrated around an axis that is deviated by a certain angle from the central axis of the hemisphere. and a 20th sound hole group is provided around the side surface of the hemispherical case, and the ear speaker is configured such that the first sound hole group is located at the entrance of the external auditory canal when worn. (2) The ear speaker according to claim 1, wherein the case has one for the left ear and one for the right ear, and is attached to both ends of an elastic semicircular arc-shaped navel band. (3) The case has a cover made of porous elastic material that covers the side and bottom of the rear side of the speaker unit, and is configured so that this cover is compressed and held between the tragus and the antitragus of the auricle when worn. The ear speaker according to claim 1, characterized in that 'I'I'rf'1.