JPH08168094A - Speaker - Google Patents

Abstract

PURPOSE: To realize a satisfactory frequency characteristic at a low cost by preventing unnecessary resonance and surface squeaking in the speaker used in various sound apparatus and video apparatus. CONSTITUTION: The part where unnecessary resonance and surface squeaking are apt to occur on a diaphragm 27 is stuck to a projecting part 26A provided on a frame 26. Thus, vibration of the diaphragm 27 is limited to prevent unnecessary resonance and surface squeaking, thereby obtaining the speaker superior in performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various audio equipment and video equipment.

[0002]

2. Description of the Related Art In recent years, loudspeakers have been required to be smaller, thinner and lighter, and as a design means for satisfying these requirements, thinning and lightening of a diaphragm are widely used. Is coming. In particular, in the fields of video and information communication for televisions, computers, etc., the space-saving type such as a small elliptical type and a track type is remarkably spread.

Based on this background, a conventional speaker will be described below with reference to the drawings.

FIGS. 3 and 4 show a conventional speaker of this type. The conventional speaker shown in FIG. 3 has a magnetic circuit 4 formed by sandwiching a magnet 1 between an upper plate 2 and a lower plate 3. A frame 6 obtained by injection-molding a resin is joined to the upper plate 2 of the above, the outer peripheral portion of the diaphragm 7 is adhered to the peripheral edge of the frame 6, and a voice coil 8 for driving the diaphragm 7 is formed. The middle part is held by a damper 9 and is joined to the central part of the diaphragm 7 so as to fit into the magnetic gap 5, and a dust cap 10 is bonded to the upper surface of the part of the diaphragm 7 where the voice coil 8 is joined. It had been.

As another conventional example, as shown in FIG. 4, there is also a structure in which a characteristic correction piece 11 made of sponge, urethane, cloth, paper or the like is adhered to the back surface of the diaphragm 7.

[0006]

However, in the conventional speaker of this type, since the diaphragm 7 has a thin shape and is lightweight, the diaphragm 7 has a small shape rigidity and is generally thin. Therefore, when this diaphragm 7 vibrates, resonance occurs in this diaphragm 7 and disturbs the frequency characteristics, or when this phenomenon is severe, an abnormal sound is generated due to the ringing of the diaphragm 7. Etc. in terms of quality,
These phenomena often occur particularly in an elliptical or track type speaker as a speaker shape.

Further, conventionally, in order to solve these problems, there is a speaker having a characteristic correction piece 11 adhered to the back surface of the diaphragm 7 as shown in FIG. 4, but in this case, the characteristic correction piece is used. The cost of 11 and the cost for bonding it are required, which causes a great increase in cost, and this characteristic correction piece 11 may come off to cause a new quality problem. It was what was desired.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a speaker having excellent frequency characteristics, sound pressure characteristics, and reliability.

[0009]

In order to solve this problem, a speaker according to the present invention is provided with a projection portion that protrudes toward the diaphragm and abuts against the back surface of the diaphragm at a portion near the middle portion in the radial direction of the frame. The protrusion is provided and the tip of the protrusion is connected to the diaphragm by an adhesive having flexibility.

[0010]

With this configuration, the portion of the diaphragm where the unwanted resonance and surface squeal are likely to occur is fixed to the protrusion that is part of the frame, so unnecessary vibration is limited to prevent unnecessary resonance and surface squeal. The frequency characteristics can be made very excellent.

[0011]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view showing the structure of the speaker according to the embodiment, and as shown in the drawing, the magnet 2 is used.
1 of the magnetic circuit 24 configured by sandwiching 1 between the upper plate 22 and the lower plate 23.
A frame 26 having a protruding portion 26A obtained by injection molding a resin is joined to the frame 26, and the outer peripheral portion of the diaphragm 27 is adhered to the peripheral portion of the frame 26. At this time, the protruding portion 26A provided on the frame 26 Of the voice coil 28 for driving the vibration plate 27 is fixed to the rear end of the vibration plate 27 by a flexible adhesive.
Is held in the center of the diaphragm 27 and is joined to the central portion of the diaphragm 27 so as to fit into the magnetic gap 25, and the dust cap 30 is bonded to the upper surface of the joint portion of the diaphragm 27 with the voice coil 28.

Further, the projection 2 provided on the frame 26
6A is set in the vicinity of the midpoint of the radial dimension of the frame 26, and this position becomes a portion where unnecessary resonance and surface squeal of the diaphragm 27 are likely to occur.
The vibration of the protrusion 7 is restricted by the protrusion 26A to prevent unnecessary resonance and squealing, and the frequency characteristics can be made very excellent. It is considered optimal to have a configuration in which two sets of 26A are symmetrically arranged in a diagonal direction, and a plurality of sets of protrusions 26A are set as necessary.

Further, the protrusion 26A and the diaphragm 27 are coupled with each other by using a flexible adhesive, so that the hardness of the adhesive is changed and the coupled state has flexibility. It is also possible to arbitrarily adjust the frequency characteristic.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a front sectional view showing the structure of the speaker according to the present embodiment. This embodiment is different from the above-mentioned first embodiment in that the diaphragm and the projection provided on the frame are connected differently. Since the other configurations are similar to those of the first embodiment, detailed description thereof will be omitted, and only different portions will be described.

In FIG. 2, reference numeral 26 is a frame, 26B is a projection portion provided in the vicinity of the radial middle portion of the frame 26,
27A is a vibration plate, and a hole into which the protrusion 26B provided on the frame 26 is fitted is previously formed in the vibration plate 27A, and the protrusion 26B is inserted into this hole and then bonded with flexibility. Diaphragm 27A and protrusion 26
This is a configuration in which Bs are combined.

The effect of this embodiment is that in addition to the effect of the first embodiment, the work of adhering the diaphragm 27A and the protrusion 26B can be performed very easily.

[0019]

As described above, the speaker according to the present invention is
The vibration is limited by fixing the part of the diaphragm where unwanted resonance and surface squeal are likely to occur to the protrusion provided on a part of the frame to prevent unnecessary resonance and surface squeal, resulting in excellent frequency characteristics. It can be

Further, this effect is particularly prominent in an elliptical or track type speaker as the shape of the speaker, and is also prominent in a lightweight diaphragm which easily causes surface noise.

Further, the cost of the characteristic correction piece and the cost for adhering the characteristic correction piece can be reduced, and a large cost reduction can be achieved, as compared with the conventional method in which measures are taken by the characteristic correction piece that is bonded later. Not only is there a problem in quality that the characteristic correction piece comes off.

Therefore, according to the present invention, the reliability of the frequency characteristics is stabilized, the sound pressure level is improved by reducing the weight of the diaphragm, and the abnormal noise due to the squealing of the cone surface and the occurrence of quality defects such as the deviation of the characteristic correction piece are prevented. Performance and cost reduction, and it is possible to provide an excellent speaker that can freely control frequency characteristics and sound pressure characteristics, and its industrial value is extremely large. .

[Brief description of drawings]

FIG. 1 is a front sectional view showing a speaker according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a speaker according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a speaker according to a conventional example.

FIG. 4 is a sectional view showing a speaker according to a conventional example.

[Explanation of symbols]

 21 Magnet 22 Upper Plate 23 Lower Plate 24 Magnetic Circuit 25 Magnetic Gap 26 Frame 26A Projection on Frame 26A 26B Projection on Frame 27 Vibration Plate 27A Vibration Plate with Pre-Hole 28 Voice Coil 29 Damper 30 Dust Cap

Claims (2)

[Claims] 1. A speaker comprising a vibration plate having a frame coupled to an upper surface of a magnetic circuit having a magnetic gap, a peripheral portion coupled to a peripheral portion of the frame, and a voice coil centered around a voice coil fitted in the magnetic gap. ,
A protrusion protruding toward the diaphragm and abutting the back surface of the diaphragm is provided in a portion near the middle portion in the radial direction of the frame, and the tip of the protrusion is bonded to the diaphragm by a flexible adhesive. The speaker. 2. The speaker according to claim 1, wherein the protrusion provided on the frame and the diaphragm are coupled by forming a hole in the diaphragm and inserting the protrusion into the hole.