JPS58188993A - Ear microphone - Google Patents

Abstract

PURPOSE:To suppress the generation of noises due to external oscillation as much as possible by attaching an external body to an insertion body which is inserted into the external auditory miatus through an elastic member, and using materials with large mass for the insertion body and external body. CONSTITUTION:A sound signal transmitted by bone conduction oscillates the insertion body 2, whose oscillation is converted by a converting element 3 into an electric signal, which is sent to a transmitter 6 to be radiated as a radio wave from an atenna. Oscillation transmitted from the outside through a lead line 3a, on the other hand, is absorbed by the oscillation system consisting of the external body 5 and line 3a. Oscillation applied directly to the external body 5 is absorbed by the oscillation system of the insertion body 2 and member 4. In either case, the resonance frequency of each resonance system is preferably outside of the low band of the effective sensitivity frequency band to the element 3. For this purpose, the insertion body 2 and external body 5 are increased in mass and the elastic modulus of the member 4 should be large. Consequently, the external oscillation transmitted to the lead line 3a and that applied directly to the external body 5 are absorbed excellently to suppress the generation of noises due to the external oscillation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ear microphone that transmits sound by converting bone-conducted sound vibrations from the wall of the external auditory canal into air.

Conventionally, this type of ear microphone has a structure that can withstand use under external noise, but on the other hand, it has a structure that can withstand use under external noise. vibrations caused by wind vibrations in the ear, imaging caused by fingers or temples of glasses coming into contact with the outside of the ear canal, use of lead wires or sound pipes (
If the structure is as follows, the vibrations generated by the friction of clothing or the contact of fingers in contact with the skeleton lead wire and sound pipe are transmitted 1 to 5 degrees out of 17, and the conduction signal sound is transmitted without distinction. , the microphone output is transmitted as noise to the audio signal, and the noise level often far exceeds the audio signal level and interferes with the transmission of the audio signal. Since it is configured to compensate for the significant transmission loss in the high frequency range during bone conduction of the signal, After being converted into drowsiness, the high frequencies are emphasized and converted into an audio signal by a speaker etc., which has the drawback of being unpleasant to the human ear and being audible. The present inventor has determined that the bone conduction If obtained from the external auditory canal wall
Focusing on the fact that the energy of the S vibration is relatively large and the audio output signal of the ear microphone does not decrease significantly even when the effective load weight of the ear microphone is around several grams, we added more weight to the ear microphone and created an effective elastic member. The object of the present invention is to provide an ear microphone which forms an independent vibration system by combining the parts, thereby obtaining a vibration-proofing effect and eliminating noise caused by external imaging.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment, in which 1 is an ear canal of a listener, 2 is an insert body inserted into the nuclear ear canal 1, It is made of quality materials such as cast. 3 is an air conversion element made of a piezo element or the like having one end fixed in the hollow part 2a of the insert 2; 4 is an elastic member made of a material such as metal, natural or synthetic rubber; It is fixed on the back of 2. Reference numeral 5 denotes an outer body Kt fixed to the back surface of the elastic member 4, and is made of the same high-quality material as the insert 2.

The lead wire 3a of the conversion element 3 is connected to the elastic member 4 and the outer body 5.
The signal is led out to the outside via the transmitter 6 and connected to the transmitter 6. Note that 7 is an antenna.

Next, the operation of the ear microphone having the structure described above will be explained.

The audio signal transmitted by bone conduction is transmitted through the insertion body 2.
Then, the vibration is transmitted to the conversion element 3 and becomes an electric signal, which is sent to the transmitter 6 via the lead wire 3a and is radiated as a radio wave from the antenna. is absorbed by the vibration system made of the spring and elasticity of the outer body 5 and the lead wire 3a. Further, the imaging directly applied to the outside t*5 is absorbed by the vibration system of the insert body 2 and the elastic member 4.

Also in case 1 above, the effective sensitivity FM of the conversion element 3
It is desirable that the resonance frequency of each resonance system be outside the low range of the H number band (e.g. 300 to 3300 Hz).
For the weight of the insert body 2 and the outer body 5, 211: and,
The elastic part vJ40 has a large elastic modulus (if it is high,
In particular, if the elastic coefficient of the elastic member 40 is large, the effective load weight of the conversion element 3 for the movement of the external auditory canal audio signal is approximately only the insert body 2, and the weight of the outer body 5 has almost no effect, leading to a decrease in the audio signal output. is avoided.

However, in practice, there are limits to the weight of the insert 2 and the outer body 5 due to the diameter and depth of the ear canal, the usable volume around the ear canal, and the long-term comfort of wearing objects in the ear. be. On the other hand, there is an upper limit to the elastic modulus of the elastic member 4 due to the need for ease of mounting the conversion element 3, stability, and appropriate strength as a product. Therefore, for the insert body 2 and the outer body 5, metal such as zinc die-casting having a large specific gravity is suitable, and for the elastic member 4, it is necessary to A spring with a high elastic modulus is required for the elastic member 4.Although a combination of mechanical springs can be considered as the elastic member 4, materials such as natural or synthetic rubber are preferred since the overall size is small.

Furthermore, the lead m3a of the conversion element 3 and the elastic member 40 are
It must be thin enough and flexible to avoid lowering the elasticity by 5Vr.

The following $M example only functions as a microphone, but below, Section 2.3 describes an example in which it also functions as an earphone, i.e., allows two-way communication.
This will be explained with figures.

Note that the same reference numerals as in FIG. 1 indicate the same members, and explanations thereof will be omitted.

In the embodiment shown in FIG. 2, reference numeral 8 is a sound conduit that passes through the outer body 5, the elastic member 4, and the insert body 2, and has one end opened at the proximal end of the insert body 20, and the other end opened at the speaker 9. speaker 9
A sound is emitted from 1111 of the inserter 2 and transmitted to the external auditory canal l. IO is a receiver connected to the speaker 9 via a lead m9a, and 11 is an antenna.

In the embodiment shown in FIG. 3, one end of the sound pipe 8 is installed in the outer body 5 with an opening 17, and the speaker 9 and the receiver 10 are connected with a lead wire 9a. It is something.

Next, the operation of the embodiment shown in FIG. 12.3 will be described. The operation of the ear microphone is the same as that of the embodiment shown in FIG. 1, so the explanation will be omitted. In operation as an earphone, an external signal received by the receiver 10 is reproduced by the speaker 9 and emitted into the ear canal I via the sound pipe 8.

By the way, the conventional automatic switching call system that uses a single carrier frequency combined with a vOX circuit, which allows two-way calls, has the disadvantage that malfunctions may occur due to noise generated by external vibrations. Manual switching was performed without performing autopsy using the method.

However, in this embodiment, as explained in the embodiment shown in FIG. It is possible to adopt an automatic switching call method using a single carrier frequency, making it possible to make two-way calls using only one ear without using both hands.

In addition, the sound pipe 8 is ')-? Elastic member 4 to return to line 3a
It must be sufficiently soft so as not to reduce the 0 elastic modulus to a low F. As described above, the present invention is to attach the outer body to the insert inserted into the external auditory canal via an elastic member, and to By constructing the body and the outer body from a pawn shop material, it can effectively absorb external vibrations that are transmitted to the lead wire of the conversion element inserted into the inserter and external vibrations that are directly applied to the outer body. ,
Therefore, the generation of noise due to external vibration can be suppressed as much as possible.

[Brief explanation of the drawing]

The figure shows a practical example of the ear microphone according to the present invention,
Figure 1 is a cross-sectional view of an actual example of a single microphone, and Figure 2.3
The figure is a sectional view of an embodiment capable of two-way communication. l... External auditory canal, 2... Insert, 3... Conversion element, 3a... Lead wire, 4... Elastic member,
5...Katsuo Kiki, the external fraud applicant

Claims (1)

[Claims] A vibration-electric transducer such as a piezo element is provided inside, and an insert with a large mass is inserted into the ear canal, an elastic member with a large elastic modulus is attached to the cough insert, and the device is attached via the elastic member. 1. An ear microphone comprising an outer body with a large mass, and a lead wire of the conversion element is led out through an elastic member and the outer body.