JP2893510B2 - Ear microphone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone element which can be inserted into an external auditory canal so that a microphone element can generate a sound signal while receiving a sound from a receiver unit and receiving bone conduction when a user speaks. This is related to improvement of ear microphones.

[0002]

2. Description of the Related Art An ear microphone used in a place where the surrounding noise is loud is inserted into an ear canal, which forms a part of a housing, and when the user speaks, the bone conduction of the ear canal is reduced by the ear tip. The signal is received by the unit and converted into an audio signal by a microphone element. The bone conduction microphone is not limited to the one inserted into the external auditory canal, and any part of the head bone can be vibrated.However, in the case of an ear microphone that is formed integrally with the earphone, one housing is used. In this case, both the microphone element and the receiver unit must be disposed.

The microphone element housed in the case of the ear microphone is generally rectangular, and the receiver unit is generally disk-shaped. The general shape of an ear microphone that accommodates them is as shown in FIG. In this figure, reference numeral 1 denotes a case, which is composed of an ear tip portion 2 and a main body portion 3 so that the ear tip portion 2 is inserted into an ear canal.

[0004] The ear microphone is an ear tip unit 2
Is inserted into the ear canal, and its size and weight are naturally limited. That is, when it is considered that an adult male uses the main body 3, the diameter dimension A is 16
mm, and the length B of the ear tip 2 to be inserted into the ear canal is preferably about 8 to 13 mm. Further, the total dimension C of the ear tip portion 2 and the main body 3 should not exceed 28 mm because the shorter the main body 3 protruding from the ear canal, the better.

Although the inside dimensions of the housing 1 are limited as described above, the internal space is made as large as possible under these conditions, and the microphone element 4 and the receiver unit 5 are disposed there. The problem is how to position the microphone element 4 and the receiver unit 5 and in what direction. FIG. 4 shows an example.
In this case, the microphone element 4 is placed horizontally,
About half of the front part faces the ear tip part 2 and the rear part faces the main body part 3. The receiver unit 5 is placed vertically, and is placed on the main body 3 above the microphone element 4. A hole 6 is provided in the ear tip portion 2 so that sound waves can enter and exit.

In such a layout, the length B of the ear tip portion 2 can be freely set, but the diameter A is large because the receiver unit 5 is disposed vertically above the microphone element 4. It will be. In order to keep this within 16 mm, the diameter of the receiver unit 5 needs to be about 10 mm. When the size of the receiver unit 5 is reduced in this way, the efficiency is reduced and the sound quality is deteriorated.

Therefore, the layout is changed as shown in FIG. In this layout, the receiver unit 5 does not rest on the microphone element 4, so that the diameter dimension A can be reduced, but the length B of the ear tip 2 becomes longer. Since the ear tip 2 is about to be inserted into the ear canal, if this part becomes longer,
It becomes difficult to hold in the ear canal and it is easy to fall.

In the meantime, since ear microphones are required to be miniaturized, a magnetic type is often used as the receiver unit 5. In the case of the magnetic type, most of the shape is a square shape, and the shape can be very small, so that it is easy to use. This magnetic type is designed so that sufficient output can be obtained in the audio band, so it is satisfactory in terms of power, but on the other hand, there is a problem that it is limited in sound quality .

There is a dynamic type receiver unit used for an in-ear type headphone. This is excellent in sound quality and has sufficient power, but if it is used for an ear microphone as it is, its diameter is usually as large as 13 to 16 mm, so that the whole becomes very large. By the way, in order to obtain high sound quality, it is necessary to make the dimension in the radial direction as large as possible in this dynamic type receiver unit. If a layout is devised taking advantage of this point, a dynamic type receiver unit can be used for the ear microphone.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and even when a dynamic type receiver unit having excellent sound quality is used, both the microphone element and the receiver unit have sufficient sizes. It is an object of the present invention to provide an ear microphone which can reduce the size of the housing as much as possible.

The prior art of ear microphones is as follows.
First, there is one described in Japanese Utility Model Publication No. 54-20898. In this publication, an earpiece (ear tip portion) inserted into an external auditory canal is used as a vibration transmitting portion, and a vibration pickup (microphone element) is provided inside the ear canal in a direction substantially perpendicular to the ear canal wall. An earphone (receiver unit) is provided inside the earpiece or integrally with the earpiece. With this structure, the conversion efficiency of the vibration pickup is good, the external dimensions are not large, and the shape is good.
There is a problem that the efficiency is inevitably reduced because earphones of a sufficient size cannot be used.

[0012] Another example of the prior art is disclosed in
No. 28558, JP-B-63-28559, JP-B-63-28560, JP-B-63-62954
Gazette, JP-B-63-62955 and JP-B-6-62955
Each of the publications described in JP-A-3-62956 has a microphone element and a receiver unit which are different in structure and shape from those of the present invention, and the objects of the invention are also different. Therefore, the above problem is not solved as it is.

[0013]

SUMMARY OF THE INVENTION The present invention provides an ear microphone in which a microphone element and a receiver unit are arranged inside a housing which includes an ear tip portion and a main body portion and in which the ear tip portion is inserted into an ear canal. In the above, the shape of the space inside the housing is formed so that a rectangular microphone element can be arranged horizontally from the main body to the ear tip.
A microphone element is provided, and a rear upper portion of the microphone element inside the main body is formed in a shape such that a disk-shaped receiver unit can be provided in the same direction as the microphone element, and the receiver unit is provided. Receiver
Attach a sound guide plate at the bottom of the unit, and
Guide the sound emitted by the knit toward the hole provided in the ear tip
An ear microphone characterized in that it is configured as follows.

[0014]

As described above, since the housing has a configuration in which the microphone element and the speaker unit can be arranged in parallel at different levels, even if a relatively large receiver unit (having a diameter of about 12 to 15 mm) is used. Thus, it is possible to obtain an ear microphone that can be set in the external auditory meatus without any discomfort. And the sound guide plate allows
A hole in the eartip where the sound produced by the sheaver unit
To be heard in places with high ambient noise.
It will be easier to remove. Note that there is no change in the electric function from the conventional one.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The housing 1 includes an ear tip portion 2 and a main body portion 3 as in the case of FIGS. The internal space S of the housing 1 is formed in a shape such that a rectangular microphone element 4 can be arranged horizontally from the main body 3 to the ear tip 2. The upper rear portion of the microphone element 4 inside the main body 3 is formed in a shape such that the disc-shaped receiver unit 5 can be disposed horizontally. That is, the microphone element 4 and the receiver unit 5
When these are arranged, they are in a parallel positional relationship with different levels.

Lead wires 7 and 8 are connected to the microphone element 4 and the receiver unit 5, and are led out of the bushing 10 as cords 9. The cord 10 is connected to an amplifier (not shown).

Since the receiver unit 5 is disposed horizontally, the sound generated by the receiver unit 5 is generated in a direction intersecting the hole 6 provided in the ear tip 2. For this reason, a sound guiding plate 11 is obliquely attached to the front part (lower part) of the receiver unit 5 so as to guide the sound toward the hole 6.

The method of connecting the microphone element 4 and the receiver unit 5 to an amplifier and the like and the method of using the same are the same as the conventional one. That is, if the ear tip 2 is inserted into the ear canal and held and uttered, the bone conduction vibration transmitted through the ear tip 2 causes
An audio current is generated in the microphone element 4 and output to the lead wire 7. When an audio current is supplied from the amplifier to the receiver unit 5 through the lead wire 8, the receiver unit 5 generates a sound. Thereby, it functions as an ear microphone that performs transmission and reception simultaneously.

[0019]

According to the present invention, since the ear microphone is configured as described above, it is possible to increase the space for disposing the receiver unit. Therefore, here, a dynamic type receiver unit which has not been used conventionally because of its large diameter can be provided. Also in this case, the overall size can be reduced. Les
By installing a sound guide plate below the sheaver unit
The sound emitted by the receiver unit is set in the ear tip.
Guided to the hole, where the surrounding noise is loud
But it becomes easier to listen.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along line XX.

FIG. 3 is a side view showing the inside of FIG. 1 from the left.

FIG. 4 is an explanatory diagram showing an example of an internal arrangement of a conventional ear microphone.

FIG. 5 is an explanatory diagram showing another example of the internal arrangement of a conventional ear microphone.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Housing 2 Ear tip part 3 Main body part 4 Microphone element 5 Receiver unit 6 Hole 11 Sound guide plate S Internal space

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoya Atsumi 1-12-17 Kamedarijaku, Mitaka-shi, Tokyo Inside Atsuden Corporation (56) References JP-A-55-61197 (JP, A) JP-A-5 JP-A-284584 (JP, A) JP-A-63-120547 (JP, A) JP-A-63-80698 (JP, A) JP-A-2-108400 (JP, A) JP-A-4-172794 (JP, A) ) Actually open 63-195987 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 1/02-1/23 H04R 1/00

Claims (1)

(57) [Claims] 1. An ear microphone in which a microphone element and a receiver unit are disposed inside a housing including an ear tip portion and a main body portion, wherein the ear tip portion is inserted into an ear canal. Is formed in a shape such that a rectangular microphone element can be arranged horizontally from the main body part to the ear tip part, and the microphone element is arranged,
An upper rear portion of the microphone element inside the main body is formed in a shape such that a disc-shaped receiver unit can be disposed in the same direction as the microphone element.
A knit is arranged, and sound is guided below the receiver unit.
Attach the board and listen to the sound emitted by the receiver unit.
An ear microphone, wherein the ear microphone is configured to be guided toward a hole provided in a tip portion .