JPH09238389A - Speaker equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the speaker with a small sized configuration having an excellent reproduction characteristic over a wide frequency band. SOLUTION: A medium and low sound diaphragm 5 and a high frequency sound diaphragm 18 are vibrated through the drive of a medium and low sound voice coil 7 for a medium and low sound frequency and the high frequency sound diaphragm 18 is mainly vibrated through the drive of a high sound frequency voice coil 20 for a high frequency to obtain a 2-way speaker system. The medium and low sound voice coil 7 and the high sound frequency voice coil 20 are supported elastically via a soft adhesive 17 and placed in a magnetic gap 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a speaker device for converting an electric signal into sound.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
The voice coil 107 is disposed in the magnetic gap portion 114 of the magnetic circuit so as to be movable, and the diaphragm 105 attached to the voice coil 107.
A speaker device has been proposed which converts an electric signal supplied to the voice coil 107 into a sound generated by the vibration of the diaphragm 105.

In this speaker device, the voice coil 107 is supplied with an electric signal to cause the magnetic flux in the magnetic gap portion 114 to flow into the diaphragm 10.
The vibration plate 105 is vibrated by moving along with 5.

The above magnetic circuit has a yoke 102 formed of a magnetic material in a substantially disc shape and having an annular driving magnet 103 attached to the front surface thereof. This yoke 1
In the center of the front part of 02, the drive magnet 103
A cylindrical center pole 101 is provided so as to project coaxially with respect to. On the front surface of the drive magnet 103,
A top plate 104 formed of a magnetic material and having a disk shape having a through hole in the center is attached. The through hole of the top plate 104 and the tip end side portion of the center pole 101 face each other to form the magnetic gap portion 114.

A frame 108 for supporting the vibrating plate 105 is attached to the front surface of the top plate 104. The voice coil 107 is provided on the rear surface of the diaphragm 105 via a cylindrical bobbin 106.
Is installed. The voice coil 107 is located in the magnetic gap 114.

The vibrating plate 105 is the bobbin 1
The central through hole to which 06 is attached is closed by a cap portion 112. The vibrating plate 105 is attached to the front end portion of the frame 108 by a gasket on the peripheral side portion via the peripheral side edge portion 113. The bobbin 106 is connected to the frame 10
8 is supported via a damper 109.

[0007] The lead 110 from the voice coil 107 is connected to a terminal 111 provided on the frame 108.

In a so-called dynamic type full range speaker which reproduces from a low frequency band to a high frequency band, as shown in FIG. 4, a single cone type having a single diaphragm 105, As shown in FIG. 5, a double cone type having a sub-vibration plate (sub-cone) 116 in the central portion of the vibration plate 105 has been proposed.

In order to perform sufficient sound reproduction in the high frequency band in such a full-range speaker, the central portion (top portion) of the diaphragm 105 is made highly rigid and lightweight, and the voice coil is used. 107 also needs to be lightweight.

[0010]

By the way, in the speaker device used as the whole range speaker as described above, the voice coil 107 is driven over a higher frequency band than a low frequency band. Compared to the voice coil dedicated to the high frequency band,
It becomes heavy.

The heavy weight of the voice coil 107 lowers the high frequency reproduction limit frequency and deteriorates so-called crispness in high frequency sound reproduction.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and while the device configuration is small,
An object of the present invention is to provide a speaker device capable of excellent sound reproduction over a wide frequency band from a low band to a high band.

[0013]

In order to solve the above-mentioned problems, a speaker device according to the present invention comprises a diaphragm for middle and low frequencies,
A first bobbin attached to the diaphragm for middle and low sounds and having a voice coil for middle and low sounds wound thereon, a diaphragm for treble sound, and a voice coil for treble sound attached to the diaphragm for treble sounds are wound to produce the high sound. Second bobbin having a voice coil for use in coaxial with the voice coil for middle and low frequencies, and a magnetic gap portion, and the voice coil for medium and low frequencies and the voice coil for high frequencies are located in the magnetic gap portion. A magnetic circuit is provided, and the first and second bobbins are elastically held by a soft adhesive.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the speaker device according to the present invention has a disk-shaped yoke 2 made of a magnetic material. The yoke 2 has a cylindrical center pole 1 integrally formed in the center of the front surface.

An annular driving magnet 3 is fixed to the front surface of the yoke 2 with an adhesive. The drive magnet 3 is coaxial with the center pole 1. That is, the center pole 1 is provided in the through hole at the center of the drive magnet 3.
Is being entered.

A top plate 4 formed of a magnetic material in the form of a disk (annular ring) having a through hole at its center is attached to the front surface of the drive magnet 3 with an adhesive. The top plate 4 is arranged coaxially with the center pole. The tip side portion of the center pole 1 is inserted into the through hole at the center of the top plate 4.

That is, when the top plate 4 is attached to the drive magnet 3, a gap guide is inserted between the outer peripheral surface of the center pole 1 and the inner peripheral surface of the through hole at the center of the top plate 4. While the top plate 4 is positioned with respect to the center pole 1, the top plate 4 is adhered to the drive magnet 3. Then, after the adhesive for adhering the top plate 4 to the drive magnet 3 is solidified, the gap guide is removed so that the top plate 4 is positioned with respect to the center pole 1. Fixed.

The inner peripheral surface of the through hole in the central portion of the top plate 4 and the outer peripheral surface of the tip side portion of the center pole 1 face each other to form a magnetic gap portion 15.

On the front surface of the top plate 4, a rear end side portion of a cylindrical frame 8 having a substantially conical shape whose front end side is expanded is attached.

The peripheral portion of the middle-and-low-pitched diaphragm 5 is attached to the holding portion on the front end side of the frame 8 by the gasket 14 via the edge portion 13. The edge portion 13 is formed to have flexibility and is displaceable in the front-rear direction. The middle-and-low-pitched diaphragm 5 is formed in a substantially conical shape having a through hole in the central portion.

A first bobbin 6 is attached to the central portion of the middle-and-low-pitched diaphragm 5 toward the rear side. The first bobbin 6 is formed in a cylindrical shape, and its front end is attached to the middle-and-low-pitched diaphragm 5. This first
It is desirable that the bobbin 6 has a high rigidity and is lightweight. Therefore, this first bobbin 6 is
It is desirable that a bakelite plate, a paper or cloth impregnated with an epoxy resin, a synthetic resin material such as a glass-epoxy plate (a glass fiber material hardened with an epoxy resin), a metal foil, or paper is rolled into a cylindrical shape.

On the outer peripheral surface of the rear end side of the first bobbin 6, a voice coil 7 for middle and low frequencies is adhered. The middle and low-pitched voice coil 7 has a lead wire (tinsel wire) 10 and is wound into a cylindrical shape. The lead wire 10 is soldered and connected to a contact portion 11 provided on the frame portion of the frame 8.

The peripheral portion of the high-pitched vibration plate 18 is attached to the front portion of the middle-and-low-pitched vibration plate 5 via the edge portion 19. The treble diaphragm 18 is formed to have a smaller diameter and a lighter weight than the middle-and-low-pitched diaphragm 5. The edge portion 19 is formed to have flexibility and is displaceable in the front-rear direction. The treble diaphragm 18 is formed in a substantially conical shape having a through hole closed at the center by the dome-shaped cap 12.

A second bobbin 16 is attached to the central portion of the treble diaphragm 18 toward the rear side.
The second bobbin 16 is formed in a cylindrical shape, has a front end portion attached to the high-pitched vibration plate 18, is located on the inner side of the first bobbin 6, and is attached to the first bobbin 6. In contrast, it is made coaxial. As with the first bobbin 6, the second bobbin 16 preferably has a high rigidity and a light weight.

A high-pitched voice coil 20 is bonded to the outer peripheral surface of the second bobbin 16 on the rear end side. The high-pitched voice coil 20 is located at substantially the same position as the front-rear direction with respect to the middle-and-low-pitched voice coil 7.

This high-pitched voice coil 20 has a lead wire (tinsel wire) 10 and is formed by being wound in a cylindrical shape. The lead wire 10 is soldered and connected to the contact portion 11. That is, the middle- and low-pitched voice coils 7 and the high-pitched voice coil 20 are connected to the contact portion 11 in parallel with each other. In this speaker device, these two voice coils 7,
Since 20 are connected in parallel, a thin wire can be used as a wire forming the voice coil, as compared with the case where the speaker device is formed by one voice coil. The weight can be reduced.

Then, the first and second bobbins 6, 1
The space 6 is elastically held by the soft adhesive 17. The soft adhesive 17 is, for example, a rubber-based adhesive (for example, SC801, S manufactured by Sony Chemical Co., Ltd.).
C108 etc.) and DB bond 11 made by Nogawa Chemical Co., Ltd.
05, DB bond 1101 and the like, or so-called lock varnish, various dumping agents and the like are suitable.

The middle and low-pitched voice coil 7 and the high-pitched voice coil 20 are located in the magnetic gap portion 15. That is, the above-mentioned middle and low-pitched voice coil 7
Is coaxial with the center pole 1,
It is inserted between the center pole 1 and the inner surface of the through hole at the center of the top plate 4.

That is, the first bobbin 6 around which the voice coil 7 for middle and low frequencies is wound is attached to the diaphragm 5 for middle and low frequencies.
When installing the first bobbin 6 on the center pole 1, a voice coil spacer is inserted between the outer peripheral surface of the center pole 1 and the inner peripheral surface of the first bobbin 6. In the state, this first bobbin 6
Is adhered to the diaphragm 5 for middle and low sounds. Then, after the adhesive for adhering the first bobbin 6 to the middle / low-pitched vibration plate 5 is solidified, the voice coil spacer is removed, so that the first bobbin 6 is attached to the center pole 1. It is fixed while it is positioned with respect to it.

The front end portion of the first bobbin 6 is provided with a damper 9 having flexibility and vibration absorption,
It is connected to and supported by the top plate 4.

In this speaker device, an electric signal is supplied to the middle and low-pitched voice coil 7 and the high-pitched voice coil 20 through the contact portion 11 and the lead wire 10, so that the middle and low-pitched voices are supplied. The coil 7 and the high-pitched voice coil 20 move in the magnetic flux in the magnetic gap portion 15 together with the middle-and-low-pitched diaphragm 5 and the high-pitched-tone diaphragm 18, and the middle and low-pitched diaphragms 5 and The treble diaphragm 18 is vibrated to generate sound.

In the speaker device configured as described above, when an electric signal is supplied to the above-mentioned middle and low-pitched voice coil 7 and the above-mentioned high-pitched voice coil 20 through the lead wire 10, the frequency band of the electric signal is reached. In the mid-low range (20
(About Hz to 700 Hz), the middle and low-pitched voice coil 7 and the high-pitched voice coil 20 are driven by an electromagnetic force by the magnetic flux in the magnetic gap portion 15 to operate the conductive speaker.

At this time, the middle-and-low-pitched diaphragm 5 is mainly driven and vibrates, and this vibration is also transmitted to the high-pitched diaphragm 18 through the soft adhesive 17, and the high-pitched diaphragm 5 is vibrated. 18 also vibrates together with the middle / low-pitched diaphragm 5. That is, in the case where the frequency band of the reproduced sound is the middle and low range, the middle and low range diaphragm 5 and the high range diaphragm 18
Vibrate together.

Then, the frequency band of the voice coil 7 for middle and low frequencies and the voice coil 20 for high frequency is in the high range (about 700 Hz to 1000 H) via the lead wire 10.
When an electric signal of about z or more) is supplied, the treble voice coil 20 is mainly driven by an electromagnetic force generated by the magnetic flux in the magnetic gap portion 15, and the treble diaphragm 18 is supplied.
Vibrates. In such a high frequency band, the driving force of the above-mentioned middle and low-pitched voice coil 7 is attenuated.

At this time, that is, when the electric signals supplied to the middle and low range voice coils 7 and the high range voice coil 20 are in the high frequency band, the first bobbin 6 and the second bobbin 16 are provided. Since the soft adhesive 17 holding the two with each other has low viscoelasticity,
Adhesion becomes weak. Therefore, in the high frequency band, the treble voice coil 20 is driven more largely than the middle and low tone voice coil 7.

In this speaker device, the high-frequency diaphragm 18 is vibrated mainly in the high-frequency band, so that the high-frequency sound can be reproduced well.

Further, in the speaker device according to the present invention, not only the soft adhesive 17 as described above is provided between the first and second bobbins 7 and 16, but also a so-called sponge ( They may be held together via a soft material 21, such as neoprene. The soft material 21 is adhered to the inner peripheral surface of the first bobbin 7 with an adhesive, and is adhered to the outer peripheral surface of the second bobbin 16 with an adhesive.

[0039]

As described above, in the speaker device according to the present invention, the first low and middle voice coil is wound.
Is provided with a middle-and-low-pitched vibration plate having a bobbin attached thereto, and a high-pitched vibration plate having a second bobbin around which a high-pitched voice coil is wound, and between the first and second bobbins, They are elastically held together by a soft adhesive.

Therefore, in this speaker device,
When the frequency band of the reproduced sound is in the middle mansion range, the diaphragm for middle and low sounds and the diaphragm for the high range are vibrated, and when the frequency band of the reproduced sound is in the high range, the diaphragm for middle and low sounds is Only the lightweight high-pitched diaphragm is vibrated mainly.

That is, the present invention can provide a speaker device which is small in size and is capable of excellent sound reproduction over a wide frequency band from a low range to a high range. is there.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a speaker device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a configuration around first and second bobbins, which is a main part of the speaker device.

FIG. 3 is a vertical cross-sectional view showing another example of the configuration around the first and second bobbins, which is a main part of the speaker device.

FIG. 4 is a vertical sectional view showing a configuration of a conventional speaker device.

FIG. 5 is a vertical cross-sectional view showing another example of the configuration of a conventional speaker device.

[Explanation of reference numerals] 1 center pole, 2 yokes, 3 drive magnets, 4 top plate, 5 middle and low frequency diaphragm, 6 first bobbin, 7 middle and low frequency voice coil, 8 frame, 15 magnetic gap part, 18 high frequency Diaphragm, 16
2nd bobbin, 20 high pitch voice coil

Claims (1)

[Claims] 1. A low-mid range diaphragm, a first bobbin attached to the mid-low range diaphragm around which a mid-low range voice coil is wound, a high range diaphragm, and attached to the high range diaphragm. And a second bobbin wound around the high-pitched voice coil to make the high-pitched voice coil coaxial with the middle-and-low-pitched voice coil, and a magnetic gap portion. Speaker coil in which the first voice coil and the high frequency voice coil are positioned, and the first and second bobbins are elastically held to each other by a soft adhesive.