JPH08317488A - Speaker device - Google Patents

Abstract

PURPOSE: To prevent the interference of sound and to improve sound quality by providing a conical reflector arranged on the back surface side of a speaker main body approximately coaxially with the speaker main body while turning a conical projection part to the speaker main body. CONSTITUTION: This device is constituted of the speaker main body 12 for middle and high frequency sound whose rear part is an open type and the conical reflector 23 and the conical projection part of the conical reflector 23 is turned to the speaker main body 2 and arranged approximately coaxially on the back surface side of the speaker main body 12. Also, it is preferable that the part of the maximum diameter of the conical reflector 23 is made approximately equal to or larger than the outside diameter of the speaker main body 12 and such a conical reflector 23 is arranged near the back surface side of the speaker main body 12. Then, the sound emitted to the rear part of the speaker main body 12 for the middle and high frequency sound is reflected to up, down, left and right by the conical reflector 23 arranged on the back surface side and is prevented from being reflected to a front part. Thus, the sound emitted to the rear part is hardly reflected on a wall surface and hardly interferes with the sound emitted to the front part and the sound quality is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, and more particularly to a speaker device composed of a speaker body for middle and high frequencies.

[0002]

2. Description of the Related Art A general mode of use of a conventional speaker for middle and high frequencies is to arrange the speaker for bass in a common speaker box in a speaker system. When the mid-high range speaker is placed together with the low-range speaker in the common speaker box in this way, the mid-high range speaker is affected by the back pressure of the low-range speaker. In order to avoid such an influence, the speaker for middle and high frequencies housed in a common speaker box is of a sealed type at its back or rear.

[0003]

As described above, the mid-to-high range speaker having the closed rear part in order to block the influence of the back pressure of the low range speaker does not increase the resonance sharpness at the lowest resonance frequency. In order to achieve this, it was necessary to increase the strength of the diaphragm and to equip it with a strong magnet. Therefore, there is a problem that such a mid-high range speaker becomes expensive.

When a thin and weak diaphragm which can be driven by a relatively small magnet is used, the front surface and the rear surface of the diaphragm are separated in order to reduce the resonance sharpness of the lowest resonance frequency. It needs to be open. In this case, in order not to receive the back pressure of the bass speaker, it is necessary to arrange the mid-high range speaker outside the speaker box in which the bass speaker is housed, and radiate a natural and reasonable sound.

In such a case, since the front and rear radiating surfaces of the diaphragm of the loudspeaker for medium and high frequencies are open, the load applied to the diaphragm, that is, the stiffness of the air can be reduced. Since the sound that is almost the same as the front surface is radiated from the rear surface of the open rear type mid-high range speaker, when the mid-high range speaker is placed close to the wall of the room, the rear side of this speaker The sound emitted from the wall is reflected by the wall surface, mixed with the sound emitted in the front and interfered,
There is a problem of degrading the sound quality. Further, there is a problem that the internal reflection of the speaker frame bounces off the diaphragm, particularly deteriorating the sound quality.

The present invention has been made in view of the above problems, and prevents the sound radiated to the rear from being reflected by the wall surface and interfering with the sound radiated to the front. It is an object of the present invention to provide a speaker device using a speaker for middle and high frequencies, which is improved.

[0007]

DISCLOSURE OF THE INVENTION The present invention comprises a speaker main body for mid-high frequencies and an open rear, and a conical reflector, and the conical protrusion of the conical reflector. Is arranged substantially coaxially on the back side of the speaker body toward the speaker body.

The maximum diameter portion of the conical reflector is preferably substantially equal to or larger than the outer diameter of the speaker body. Such a conical reflector is arranged close to the back side of the speaker body. You may do it.

Further, the conical reflector may be made of a synthetic resin molded body having a hollow interior and opened rearward. The conical protrusion of such a conical reflector is directed toward the speaker body. It may be arranged on the back side.

The conical reflector may be supported by a mounting plate or a baffle plate to which the speaker body is mounted, via a support arm.

[0011]

The sound radiated to the rear of the speaker body for mid-high frequencies is reflected vertically and horizontally by the cone-shaped reflector disposed on the back side thereof and is not reflected forward. Therefore, the sound radiated backward is less likely to be reflected by the wall surface and interfere with the sound radiated forward, which leads to an improvement in sound quality.

[0012]

FIG. 1 shows a speaker system in which a speaker device according to an embodiment of the present invention is combined with a bass speaker, and this speaker system includes a bass speaker 11 in the center and a pair of left and right trebles. Speaker 12 for use. The central bass speaker 11 is housed in a speaker box 13, and the speaker box 13 is supported by columns 14 in an upright state. In addition, the lower end of the column 14 is stably supported by the base 15.

On the other hand, a pair of left and right treble speakers 1
2 are respectively attached to the mounting plate 19, and the mounting plate 19 on which the speaker 12 for middle and high frequencies is mounted is mounted on the column 20.
Upright supported by. And the lower end of the column 20 is the base 2
Supported by 1.

In particular, in this embodiment, as shown in FIGS. 2 and 3, a cone-shaped reflector 23 is arranged on the back side of the speaker 12 for mid-high frequencies through a support arm 22. The conical reflector 23 is, for example, a molded body of ABS resin, has a hollow interior, and is made of a synthetic resin molded body that is opened rearward.

FIG. 4 shows the internal structure of the mid-high range speaker 12 used in this speaker device. The speaker 12 is constructed by a frame 40 having a rigid outer peripheral portion. And frame 40
A cup-shaped yoke 41 is provided in the central portion of the.
A cylindrical magnet 42 is arranged at the center of the yoke 41. A pole piece 43 is attached to the tip of the magnet 42.

A gap is formed between the outer periphery of the pole piece 43 and the inner periphery of the yoke 41, and a ring-shaped voice coil is arranged in this gap. The voice coil 46 is the dome 4 that constitutes the central portion of the diaphragm.
It is connected to the outer peripheral portion of 7. The outer peripheral side of the dome 47 is connected to the diaphragm 48. The diaphragm 48 constitutes a diaphragm, and the outer peripheral side portion thereof is fixed to the inner peripheral surface of the frame 40 via a diaphragm ring 49.

A protector 52 is provided on the front side of the frame 40 so as to protect the front sides of the dome 47 and the diaphragm 48.
Is installed. The protector 52 is provided with a radiation port 53 that radiates sound forward. Further, this speaker is provided with a radiation opening 54 which is open to the rear in the frame 40 in particular, and the sound is radiated backward by this radiation opening 54.

When assembling such a speaker,
The voice coil 4 is connected to the connecting portion between the diaphragm 48 and the dome 47.
6 is bonded using a jig. Next, the magnet 42 and the pole piece 43 are bonded together using a jig. The magnet 42 and the pole piece 43 which are adhered to each other are connected to the yoke 4
Adhesive is applied to the bottom of No. 1 and adhered. At this time, the gap guide is inserted between the pole piece 43 and the yoke 41 so that the outer peripheral portion of the pole piece 43 and the inner peripheral portion of the yoke 41 are concentric. The gap guide is removed after the adhesive has dried.

After this, the diaphragm ring 49 on the outer peripheral side of the diaphragm 48 to which the voice coil 46 is attached is adhered to the inner peripheral surface of the frame 40, and the protector 52 is attached to the front side by means such as adhesion. Then, the lead wire of the voice coil 46 is soldered to the input terminal provided on the frame 40, an adhesive is applied to the lead wire and the soldered portion to prevent disconnection, and after drying, the magnet 4
By magnetizing No. 2 and checking the positive and negative polarities, a mid-high range speaker is completed.

In the speaker having such a structure, a magnetic circuit is formed by the magnet 42, the yoke 41 and the pole piece 43, and the voice coil 46 is arranged in the air gap. Therefore, when a signal current is passed through the voice coil 46 through the external terminal and the lead wire,
This signal current causes the voice coil 46 to receive a force in the axial direction, that is, in the left and right directions in FIG. 4, according to Fleming's left-hand rule. Therefore, the vibrating plate 48 vibrates according to the signal current due to such a force, and the sound corresponding to the signal current is reproduced.

The mid-high range speaker 12 may be supported independently of the low-range speaker 11 as shown in FIGS. 1 and 2, but as shown in FIGS. Mounting plate 19 for supporting the treble speaker 12
May be supported by the speaker box 13 housing the bass speaker 11 via the support arm 27. In this case, the conical reflector 23 arranged on the back side of the mid-high range speaker 12 may be supported by the speaker box 13 of the low-range speaker 11 via another support arm 22.

Alternatively, as shown in FIGS. 7 and 8, a speaker box 1 for accommodating a bass speaker 11 is provided.
It is also possible to support the support plate 19 to which the mid-high range speaker 12 is attached by the support arms 27 extending obliquely upward and to the left from 3, respectively. In this case, a cone-shaped reflector 23 is attached to the tip of another support arm 22 extended rearward so as to be branched from the support arm 27, whereby the cone-shaped reflector 23 is attached to the rear side of the mid-high range speaker 12. It may be arranged coaxially.

The basic concept of the combination of the mid-high range speaker 12 and the conical reflector 23 as shown in FIG. 4 is shown in FIG. The loudspeaker 12 for the mid-high range has its diaphragm
Since the front surfaces of the protectors 7, 48 are opened by the radiation port 53 of the protector 52, sound is radiated forward by the radiation port 53. The area of the diaphragm at this time is
The sum of the areas of the dome portion 47 and the diaphragm 48 results in sound being emitted.

On the other hand, on the rear surface of the diaphragm 48, sound is emitted rearward through the emission port 54 provided in the frame 40. At this time, the area of the diaphragm that contributes to the sound radiated backward is the area of the back side portion of the diaphragm 48.

Considering a stereo speaker system as shown in FIG. 1, FIG. 5, or FIG. 7, if the rear side of the speaker 12 for medium and high frequencies is separated from the wall of the room, the speaker 12 for medium and high frequencies is used. The sound quality deterioration caused by the sound emitted from the rear surface being reflected from the wall surface and interfering with the sound in the front is not a problem. However, when the stereo type speaker system is arranged near the wall surface of the room, since the wall is near the rear surface of the mid-high range speaker 12, the sound reflected from the rear surface is reflected by the wall surface and radiated forward. It causes interference with sound and causes deterioration of sound quality.

Therefore, a reflector composed of the conical reflector 23 is arranged at the rear of the mid-high range speaker 12 as shown in FIG.
The radiated sound to the back is scattered and the reflected sound from the direct wall surface is reduced. As is clear from FIG. 3, the radiated sound to the rear of the mid-high range speaker 12 is reflected once by the reflector 23.
The reflected sound travels upward, downward, leftward, and rightward, and the reflected sound is less likely to be directly mixed with the radiated sound on the front surface, which leads to an improvement in sound quality.

This will be described with reference to frequency characteristics.
FIG. 11 and FIG. 12 show the results of measuring the frequency characteristic of the sound pressure at a time point 1 m away from the speaker 12 for middle and high frequencies using a JIS measurement box. The input was 1 watt here. The characteristics in the front direction are shown in FIG. 11, and the characteristics in the rear direction are shown in FIG. As is clear from this characteristic, it is understood that the open rear type mid-high range speaker 12 radiates a high output sound pressure level up to a sufficiently high frequency although the frequency characteristic has some irregularities.

Next, deterioration of sound quality due to interference of sound due to reflection on the wall surface was measured. That is, FIG. 13 shows the characteristics when the same speaker 12 is measured afterward without reflection on the wall. On the other hand, FIG. 14 shows the characteristics in the case where there is a reflection from the wall as shown in FIG. As is clear from FIG. 14, remarkable unevenness appears in the frequency characteristic. The unevenness is a disturbance in the characteristics caused by the radiation sound radiated rearward being reflected by the wall surface 31 and interfering with the front sound.

In order to prevent such disturbance of sound in FIG. 15, a conical reflector 23 is attached to the rear of the mid-high range speaker 12 as shown in FIG. 3, and the speaker 1 as shown in FIG.
2 shows characteristics when 2 is arranged in front of the wall surface 31.
Here, the characteristics are obtained when the speaker 12 has an outer diameter of 40 mm and the conical reflector 23 has an outer diameter of 80 mm. On the other hand, the characteristic shown in FIG. 16 has a diameter of the conical reflector 23 that is substantially the same as the outer diameter of the speaker 12.
It is a characteristic when a 0 mm conical reflector is used.

In the characteristic shown in FIG. 14 in which there is interference due to the reflection of the wall surface 31 shown in FIG. 10, it can be seen that the peak and the dip are caused by the reflection. The characteristics shown in FIG. 15 in the case where the reflector 23 is provided are intermediate characteristics between the characteristics measured without the wall surface shown in FIG. 13 and the case where there is reflection by the wall surface 31 shown in FIG. When the reflector 23 having a large diameter as shown in FIG. 15 has a smoother characteristic than when the reflector 23 having a small diameter is used as shown in FIG. 16, the diameter of the reflector 23 is practically larger. It is understood that the effect is great. However, when the outside diameter of the loudspeaker 12 for medium and high frequencies is 40 mm, it is necessary to consider the size balance with the reflector 23, and it is not always good to use a large reflector 23 unnecessarily. It should be noted that the open rear type speaker for middle and high frequencies is easy to obtain good sound quality because reflection inside the frame 40 is also reduced.

As described above, in the speaker device according to the present embodiment, sound can be emitted to the front surface and the rear surface of the mid-high range speaker 12, and the conical reflector for reflecting and scattering the sound emitted from the rear surface is formed on the rear surface. It is installed on the open side. Therefore, the sound emitted from the rear surface is reflected on the wall surface and interferes with the sound emitted to the front surface side, so that the sound quality can be improved.

In such a speaker device, a circular opening is formed in the plate-like mounting plate 19 so that sound can be radiated to both the front surface and the rear surface of the mid-high range speaker 12, and the mid-high range speaker 12 is formed in this opening. By mounting the speaker system, a speaker system for open mid-high range can be obtained. Then, the conical reflector 23 may be attached to the rear surface side of this speaker.
As a result, the above effects can be obtained.

Since the mid-high range speaker 12 is of the open rear type, it is not necessary to consider the stiffness of the air inside the frame 40. For this reason, the diaphragm 4 is light and thin.
8 can be used, and a high-sensitivity speaker can be provided. Although the reflector 23 has a conical shape in the embodiment, it may be modified into various shapes such as a quadrangular pyramid shape and a polygonal pyramid shape.

[0034]

As described above, according to the present invention, a pyramidal projection is provided on the back side of a speaker body for middle- and high-pitched sound whose rear side is open, and the pyramidal shape is substantially coaxial with the speaker body. A reflector is arranged. Therefore, the sound radiated backward from the speaker body is reflected sideways by such a conical reflector, and even if the speaker device is arranged near the wall surface, the radiated sound rearward is reflected in the rear wall surface. Interference with the sound that is reflected and radiated forward is prevented, and the deterioration of the sound quality is reduced.

Particularly, by making the maximum diameter portion of the conical reflector substantially equal to or larger than the outer diameter of the speaker body and disposing the conical reflector in the vicinity of the rear side of the speaker body, It is possible to effectively reflect the sound radiated rearward to the side.

By constructing the cone-shaped reflector from a synthetic resin molded body having a hollow inside and opened rearward, the reflector having a simple structure surely reflects the backward sound to the side. It will be possible.

According to the structure in which the conical reflector is supported by the mounting plate or the baffle plate to which the speaker main body is mounted through the support arm, the conical reflector is reliably supported and the conical protrusion is provided. It is possible to surely arrange the part toward the speaker main body and substantially coaxially with the speaker main body.

[Brief description of drawings]

FIG. 1 is a front view of a speaker system including a speaker device according to an embodiment of the present invention.

FIG. 2 is a side view of the speaker device.

FIG. 3 is a cross-sectional view of a main part showing a combination of a speaker for mid-high frequencies and a conical reflector.

FIG. 4 is a longitudinal sectional view of an essential part showing the internal structure of a speaker for middle and high frequencies.

FIG. 5 is a front view of a speaker system showing a configuration of a modified example.

FIG. 6 is a plan view of the same.

FIG. 7 is a front view of a speaker system according to another modification.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view showing the arrangement of a measuring device for measuring the characteristics of the speaker.

FIG. 10 is a plan view of a measuring device showing a measurement when there is no cone-shaped reflector.

FIG. 11 is a graph of sound pressure frequency characteristics in the front.

FIG. 12 is a graph of sound pressure frequency characteristics in the rear.

FIG. 13 is a graph of sound pressure frequency characteristics when there is no reflection on the wall surface.

FIG. 14 is a graph of sound pressure frequency characteristics when there is reflection on the wall surface.

FIG. 15 is a graph of sound pressure frequency characteristics when a conical reflector having a diameter twice that of a speaker is attached.

FIG. 16 is a graph showing sound pressure frequency characteristics when a conical reflector having the same diameter as the speaker is attached.

[Explanation of symbols]

 Reference Signs List 11 Low-range speaker 12 Mid-high range speaker 13 Speaker box 14 Posts 15 units 19 Mounting plate 20 Posts 21 units 22 Support arm 23 Conical reflector 27 Support arm 30 Microphone 31 Wall surface 40 Frame 41 Yoke 42 Magnet 43 Pole piece 46 Voice coil 47 Dome 48 Vibration Plate (Diaphragm) 49 Diaphragm Ring 52 Protector 53, 54 Radiating Port

Claims (4)

[Claims] 1. A speaker main body for medium and high frequencies, which is open at the rear, and a cone-shaped projection is directed toward the speaker main body and substantially coaxially with the speaker main body on the back side of the speaker main body. And a conical reflector that is arranged, and a speaker device. 2. The maximum diameter portion of the conical reflector is substantially equal to or larger than the outer diameter of the speaker body, and the conical reflector is arranged close to the back side of the speaker body. The speaker device according to claim 1, wherein: 3. The speaker device according to claim 1, wherein the conical reflector is made of a synthetic resin molded body having a hollow inside and opened rearward. 4. The speaker device according to claim 1, wherein the conical reflector is supported by a mounting plate or a baffle plate to which the speaker main body is mounted via a support arm.