JPH10257589A - Diaphragm and micropbone device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve regenerative tweeter band and sound quality without degrading regenerative woofer band by forming the membrane of reinforcing agent for improving rigidity on one side face of edge part and/or dome part. SOLUTION: On a diaphragm 3, a groove 14 is formed while being positioned on the border between a curved part 13 of edge part 11 and a dome part 12 of central part, and a membrane 15 of reinforcing agent is formed by applying the prescribed amount of reinforcing agent for improving rigidity annularly along with this groove 14. A polyester or acrylic adhesive agent is used for the reinforcing agent. The reinforcing agent is applied at the prescribed positions of diaphragm 3 and left for about one hour at the room temperature from 30 to 40 deg.C later so as to be naturally dried and formed in the shape of membrane. Since the mechanical strength of this diaphragm 3 is improved near the coupling part of dome part 12 and voice coil 5 by the membrane 15 of reinforcing agent, the regenerative tweeter band can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm vibrated by sound or a voice coil, and to a microphone device used to convert sound into an electric signal and output the signal to an audio device.

[0002]

2. Description of the Related Art Generally, a so-called dynamic microphone device is known as a microphone device. This dynamic microphone device includes a microphone unit housed in a housing.

The microphone unit includes a diaphragm vibrated by sound, a voice coil that generates an electric signal by the vibration of the diaphragm, and a magnetic circuit that forms a magnetic field with respect to the voice coil.

[0004] The diaphragm has a substantially spherical dome portion and an edge portion formed on the outer periphery of the dome portion and having a curved portion that is curved. Voice coil
One end is fixedly joined to the dome of the diaphragm, and vibrates integrally with the diaphragm. The magnetic circuit has a magnet for generating a magnetic field, and a yoke provided with the magnet to form a magnetic path.

In this microphone device, a voice coil that vibrates with the vibration of a diaphragm moves in a magnetic field generated by a magnet of a magnetic circuit to generate a current and convert sound into an electric signal.

[0006]

By the way, since the diaphragm provided in the microphone device has good moldability, and it is easy to make the reproduction band and the sound quality relatively good, it is formed of a resin material such as polyester. The used film is frequently used. That is, in this diaphragm, the edge portion and the dome portion are integrally formed, and the thickness of the film is appropriately adjusted so as to conform to desired acoustic characteristics.

The acoustic characteristics of the front of the diaphragm will be described with reference to FIG. In FIG. 7, the vertical axis represents
The output dB is shown, and the horizontal axis shows the frequency Hz. FIG.
As shown in this figure, since this diaphragm is made of film,
There is a problem that the output of the reproduction band in the high-frequency range near the frequency of 10000 Hz is poor.

Further, since the diaphragm has the dome portion and the edge portion formed integrally, there is a problem that sound quality and acoustic characteristics cannot be easily improved.

It is an object of the present invention to provide a diaphragm capable of improving the reproduction band and sound quality of a high sound range without deteriorating the reproduction band of a low sound range, and a microphone device provided with the diaphragm. With the goal.

[0010]

In order to achieve the above-mentioned object, a diaphragm according to the present invention comprises an edge portion having a curved portion formed of a resin material and having a curved portion, and a center portion of the edge portion. And a dome portion formed in a substantially spherical shape. Then, a thin film of a reinforcing agent for increasing rigidity is formed on one surface of the edge portion and / or the dome portion.

Further, the microphone device according to the present invention comprises:
An edge portion having a curved portion formed of a resin material and having a curved portion, a dome portion formed at a center portion of the edge portion and having a substantially spherical shape, and one edge of the edge portion and / or the dome portion A diaphragm having a formed thin film of a reinforcing agent for increasing rigidity, a voice coil having one end bonded and fixed to a dome portion of the diaphragm and converting vibration generated in the diaphragm into an electric signal, A magnetic circuit for forming a magnetic field.

In the diaphragm constructed as described above, since the thin film of the reinforcing agent is formed in the groove between the edge and the dome, the rigidity at the boundary between the edge and the dome is increased. The reproduction band and sound quality of the sound range are improved, and desired acoustic characteristics can be obtained.

In addition, the microphone device constructed as described above has a diaphragm whose rigidity at the boundary between the edge and the dome is enhanced by the thin film of the reinforcing agent, so that the reproduction band and sound quality in the high-frequency range are improved. , And desired acoustic characteristics can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. This microphone device is a so-called dynamic microphone, and a microphone unit 2 is housed in a housing (not shown).

As shown in FIG. 1, the microphone unit 2 includes a diaphragm 3 vibrated by external sound.
A voice coil 5 having one end joined and fixed to the vibration plate 3 and moving with the vibration of the vibration plate 3; and a magnetic circuit 6 for forming a magnetic field with respect to the voice coil 5.

As shown in FIGS. 2 and 3, the diaphragm 3 as a main part of the present embodiment is formed of a resin material such as polyester into a film shape. Annular edge 11 having 13
And a substantially spherical dome portion 12 integrally formed at the center of the edge portion 11.

Therefore, as shown in FIGS. 2 and 3, a groove 14 is formed in the diaphragm 3 at the boundary between the curved portion 13 of the edge portion 11 and the dome portion 12 at the center. A thin film 15 of the reinforcing agent is formed by applying a predetermined amount of the reinforcing agent for increasing the rigidity over the groove 14 in a ring shape.

As the reinforcing agent, for example, a polyester-based or acrylic-based adhesive, Vironal (trade name), a solution of biocellulose, or the like is used. After the reinforcing agent is applied to a predetermined portion of the diaphragm 3, for example, the room temperature is 30 to 40 ° C.
It is naturally dried by being left for about one hour to form a thin film. The diaphragm 3 is composed of a thin film 1 of a reinforcing agent.
5, the mechanical strength in the vicinity of the joint between the dome portion 12 and the voice coil 5 is increased, so that the reproduction range of the high frequency range can be expanded.

As shown in FIG. 3, one end of the voice coil 5 is bonded and fixed to the diaphragm 3 over the outer peripheral edge of the dome portion 12 with an adhesive. The diaphragm 3 has a diagram ring 17 joined and fixed over the outer peripheral edge of the edge portion 11, and a frame yoke 1 of the magnetic circuit 6 described later via the diagram ring 17.
8 attached.

The vibration plate 3 configured as described above will be described with reference to FIG. 4 showing acoustic characteristics of the front. In FIG. 4, the vertical axis indicates the output dB, and the horizontal axis indicates the frequency Hz. This diaphragm 3
As shown in FIG. 4, as compared with the acoustic characteristics of the conventional film diaphragm shown in FIG.
The output of the reproduction band in the high frequency range near z is improved.

Further, the above-mentioned diaphragm 3 has an edge portion 11
A thin film 15 of a reinforcing agent over a groove 14 between the
The other diaphragm 4 in which the thin film 16 of the reinforcing agent is formed on the dome portion 12 will be described with reference to FIG. Since the diaphragm 4 has the same basic configuration as the above-described diaphragm 3, the same portions are denoted by the same reference numerals and description thereof is omitted.

As shown in FIG. 5, a predetermined amount of a reinforcing agent for improving the rigidity is applied to the concave surface of the dome portion 12 of the diaphragm 4 to form a thin film 16 of the reinforcing agent.

The diaphragm 4 configured as described above will be described with reference to FIG. In FIG. 6, the vertical axis represents the output dB, and the horizontal axis represents the frequency Hz.

As shown in FIG. 6, the output of the diaphragm 4 in the high-frequency range near the frequency of 10000 Hz is higher than the acoustic characteristics of the conventional film diaphragm shown in FIG. Has been improved. According to the diaphragm 4, the sound quality is further improved.

The above-mentioned diaphragm 4 has a dome 12
In order to form the adhesive thin film 16, a jig for applying a reinforcing agent (not shown) is used. After the diaphragm 4 has the voice coil 5 bonded and fixed to the dome portion 12 via an adhesive, the diaphragm 4 is placed on an adhesive application jig such that the concave side of the dome portion 12 faces upward. A predetermined amount of the reinforcing agent is poured onto the concave surface of the portion 12 and air-dried. Therefore, since the reinforcing agent is applied to the diaphragm 4 after the voice coil 5 is bonded and fixed, the diaphragm 4 does not deform due to the application of the reinforcing agent, and
The thin film 16 of the reinforcing agent is favorably formed.

As shown in FIG. 1, the magnetic circuit 6 provided in the microphone unit 2 has a magnet 18 for generating a magnetic field, and a frame yoke 19 provided with the magnet 18 to form a magnetic path. ing.

The magnet 18 is formed in a cylindrical shape, and is provided inside the voice coil 5.
The frame yoke 19 is formed in a cylindrical shape with a bottom using iron or the like as a material, and the magnet 18 is disposed inside. Also, on the inner peripheral wall on the upper end side of the frame yoke 19,
The stiffness ring 20 and the plate 21 are joined and fixed via an adhesive so as to face the outer peripheral portion of the magnet 18. A damper resistor 22 is attached to a lower end of the frame yoke 19.

The magnetic circuit 6 is housed and fixed in an equalizer 24 for compensating for the attenuation in a specific frequency band and flattening the overall frequency characteristic. A terminal plate 25 is provided on a side wall of the equalizer 24, and a lead wire (not shown) of the voice coil 5 is connected to the terminal plate 25 by soldering. A lead (not shown) drawn out of the equalizer 24 is fixed to a soldered portion of the terminal plate 25 with an adhesive. The magnetic circuit 6 includes a magnet 18
Is magnetized.

Between the side wall of the equalizer 24 and the frame yoke 19, an annular directional resistor 26 for determining directivity is provided. The directional resistor 26 is formed using compressed urethane or papillon paper as a material.

A unit screen 27 is fixed to the equalizer 24 on the side opposite to the side on which the magnetic circuit 6 is housed so as to face the diaphragm 3. The unit screen 27 is formed of, for example, urethane foam, and protects the diaphragm 3 and protects the diaphragm 3 from wind, thereby preventing generation of so-called blowing noise.

Then, the microphone unit 2 is disposed in the housing while being supported by the vibration isolating cavity 28. The vibration isolating cavity 28 is formed in a substantially cylindrical shape by a rubber material having a vibration isolating property, and the other end opposite to the one end where the diaphragm 3 is provided is closed by a cover member 29. . Also, the vibration isolating cavity 28
A plurality of anti-vibration walls are arranged concentrically inside, so that the anti-vibration effect is enhanced.

As described above, in the microphone device of the embodiment, the diaphragm 3 in which the thin film 15 of the reinforcing agent is formed in the groove 14 located at the boundary between the edge 11 and the dome 12.
, It is possible to improve the reproduction band and the sound quality of the high sound range without deteriorating the reproduction band of the low sound range.

The microphone device has a diaphragm 4 in which a thin film 16 of a reinforcing agent is formed on the concave surface of the dome portion 12.
By providing the above, it is possible to further improve the reproduction band and sound quality of the high sound range without deteriorating the reproduction band of the low sound range.

The diaphragms 3, 4 according to the present embodiment
Is applied to the microphone device, but is not limited to the microphone device, and may be applied to, for example, a speaker device that outputs sound.

[0035]

As described above, according to the diaphragm according to the present invention, a thin film of a reinforcing agent for increasing rigidity is formed on the edge portion and / or the dome portion. Without this, it is possible to improve the reproduction band and sound quality of the high sound range.

According to the microphone device of the present invention, the edge portion and / or the dome portion are provided with a diaphragm on which a thin film of a reinforcing agent for increasing rigidity is formed.
It is possible to improve the reproduction band and sound quality of the high sound range without adversely affecting the reproduction band of the low sound range.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a microphone unit included in a microphone device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a diaphragm provided in the microphone unit.

FIG. 3 is a longitudinal sectional view of the diaphragm.

FIG. 4 is an acoustic characteristic diagram of the microphone device.

FIG. 5 is a longitudinal sectional view showing another diaphragm provided in the microphone unit.

FIG. 6 is an acoustic characteristic diagram of a microphone device including another diaphragm.

FIG. 7 is an acoustic characteristic diagram of a conventional microphone device.

[Explanation of symbols]

2 microphone unit, 3 diaphragm, 5 voice coil, 6 magnetic circuit, 11 edge portion, 12 dome portion, 13 curved portion, 14 groove, 15 thin film of reinforcing agent, 1
8 magnets, 19 frame yoke

Continued on the front page (72) Inventor Nariki Iwahara 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Masaru Uryu 6-35, Kita-Shinagawa-ku, Shinagawa-ku, Tokyo Sony Corporation In company

Claims (6)

[Claims] An edge portion having a curved portion formed of a resin material and having a curved portion; and a substantially spherical dome portion integrally formed at a center portion of the edge portion, wherein the edge portion has A diaphragm, wherein a thin film of a reinforcing agent for increasing rigidity is formed on one surface of the portion and / or the dome portion. 2. The diaphragm according to claim 1, wherein the thin film is formed over a groove located at a boundary between the curved portion of the edge portion and the dome portion. 3. The diaphragm according to claim 1, wherein the thin film is formed on a concave surface of the dome portion. 4. An edge portion having a curved portion formed of a resin material and having a curved shape, a dome portion formed in a substantially spherical shape at a center portion of the edge portion, and the edge portion and / or A vibrating plate having a thin film of a reinforcing agent for enhancing rigidity formed on one surface of the dome portion, and one end portion fixedly joined to the dome portion of the vibrating plate to convert the vibration generated in the vibrating plate into an electric signal A microphone device comprising: a voice coil for conversion; and a magnetic circuit for forming a magnetic field with respect to the voice coil. 5. The microphone device according to claim 4, wherein a thin film of a reinforcing agent is formed on the diaphragm over a groove located at a boundary between the curved portion of the edge portion and the dome portion. . 6. The microphone device according to claim 4, wherein a thin film of a reinforcing agent is formed on the concave surface on the voice coil side of the dome portion of the diaphragm.