JPH05260593A - Composit speaker - Google Patents

Abstract

PURPOSE:To reduce the cost of a composit speaker which is used for an automo bile, etc., by providing constitution which does not generate any abnormal sound due to mutual contacting by storing the speaker in a supporter without applying no adhesive to the coil outer peripheral part of a divider circuit for the cost reduction. CONSTITUTION:The hollow part 31 of the supporter is provided with three ribs 32, and the center space formed of those ribs 32 is finished to a diameter larger than the external diameter of a coil 1 at the upper part and a diameter a little larger than the external diameter at a place which is almost as deep as the height of the coil 1; and the coil 1 is inserted and fitted in this space to securely hold the coil 1 without using any adhesive, thereby realizing the composite speaker which has superior quality at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite type speaker used in automobiles and the like.

[0002]

2. Description of the Related Art In recent years, in order to improve the interior acoustic performance of automobiles, there has been a composite type speaker in which a speaker unit for low-pitched sound reproduction (hereinafter referred to as "woofer") and a speaker unit for mid-high-pitched sound reproduction (hereinafter referred to as tweeter) are incorporated. It has become popular.

A conventional composite speaker in which a split circuit coil is housed in a conventional supporter having a hollow portion will be described below with reference to the drawings.

FIG. 5 is an exploded perspective view of a composite speaker in which a recently developed conventional split circuit is housed in a hollow portion provided in a supporter. In FIG. 5, reference numeral 1 is a coil and is a hollow portion 2.
It is housed in a supporter 3 made of a resin molded product provided with, and the supporter 3 is provided with grooves 4, 5 and triangular projections 6, 7 in the grooves 4, 5, and the tips of the projections 6, 7 are provided. Groove 4,
Between the side wall of the coil 5 and the side wall of the coil 5, gaps 10 and 11 that are slightly narrower than the diameters of the lead wires 8 and 9 of the coil 1 are formed. The lead wires 8 and 9 are arranged at the bottom of the triangular protrusions 6 and 7 through the gaps 10 and 11, and the tweeter 13 to which the capacitor 12 is fixed and electrically connected is provided on the supporter 3. It is fitted and fixed in the tweeter 13
The terminals 15 and 16 are connected to the lead wires 8 and 9 of the coil 1.

Next, the supporter 3 has a woofer 17 at its bottom.
The voice coil 18 is inserted from above and is joined to the woofer 17 from the bottom surface of the lower plate 19 by using the screw 20, and a cylindrical urethane foam called a dustproof cushion 21 is attached to the lower part of the supporter 3. The bottom surface of the dustproof cushion 21 is fixed to the diaphragm 22 of the woofer 17. The peripheral edge of the diaphragm 22 is the frame 2
3 is fixed, and the central portion is connected to the voice coil 18,
The lead wires of the voice coil 18 are connected to conductive wires called gold thread wires 24 and 25 on the surface of the diaphragm 22, respectively.
One end of the gold thread wires 24, 25 is connected to the terminals 15, 29 of the tweeter 13 by soldering so that the woofer 17 and the tweeter 13 are connected in parallel via the capacitor 12, and the other end is a terminal fixed to the frame 23. The terminals 27, 2 of the plate 26
8 is connected.

The operation of the composite speaker constructed as described above will be described below. First, woofer 1
When an input signal is applied from terminals 27 and 28 of 7, the voice coil 18 moves up and down according to Fleming's left-hand rule, and this force causes the diaphragm 22 to oscillate and emit sound into the air. In addition, only a high frequency component of the input signal is supplied to the tweeter 13 by the dividing circuit including the coil 1 and the capacitor 12, and the middle and high frequencies are radiated into the air.

[0007]

However, in the structure of the conventional composite type speaker described above, since the outer peripheral portion of the coil 1 contacts the inner wall of the supporter 3, when the diaphragm 22 oscillates, the supporter 3 is also excited. There is a problem in that an abnormal sound called bilick is generated when the contact occurs.

In order to eliminate the occurrence of flicker, the adhesive is applied to the outer peripheral portion of the coil 1 and then the coil 1 is inserted into the hollow portion 2 of the supporter 3. Not only is it necessary, but there is also a problem that productivity cannot be improved because the adhesive cannot be moved to the next step until it is dried.

The present invention solves the above-mentioned conventional problems and is excellent in quality without causing abnormal noise due to contact between the coil and the supporter without applying an adhesive to the outer peripheral portion of the coil. An object is to provide a composite speaker at low cost.

[0010]

In order to achieve this object, the composite speaker of the present invention is provided with three or more ribs in the hollow portion of the supporter for accommodating the coil, and the central space formed by these ribs is formed. The ribs with a slight slope are placed so that the diameter is finished larger than the outer diameter of the coil at the top and slightly smaller than the outer diameter of the coil at a place as deep as the height of the coil. It has a structure in which the outer peripheral portion of the coil is pressed by a rib and the coil is fitted and fixed.

[0011]

With this configuration, the three or more ribs provided on the supporter reliably hold the coil by assisting the elasticity and viscosity of the resin. In other words, since the outer peripheral portion of the coil is reliably pressed down by the three ribs, the outer peripheral portion of the coil does not come into contact with the inner wall of the hollow portion of the supporter at any place other than the ribs, which is an abnormality called bilick. No sound is produced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state before a tweeter, a coil and a supporter are attached to a woofer according to an embodiment of the present invention. Here, in the same case as described in the conventional example, the same reference numerals are given and detailed description thereof will be omitted.

In FIG. 1, reference numeral 30 denotes a supporter, and three ribs 32 are provided in the hollow portion 31 at 120 ° intervals. The diameter of the central space formed by these ribs 32 is the same as that of the hollow portion 3.
The inlet is larger than the outer diameter of the coil 1 and is slightly smaller than the outer diameter D at a depth of about the height H of the coil 1, that is, has a vertical gradient. The coil 1 is inserted into the central space formed by the rib 32, and the coil 1 is strongly pushed until the rib 32 presses the vicinity of the bottom of the coil 1.

Further, the supporter 30 is provided with grooves 4 and 5 and triangular projections 6 and 7 in the grooves 4 and 5, and the lead wires 8 and 9 of the coil 1 are passed through the gaps 10 and 11 to project. 6,
The tweeter 13, which is arranged at the bottom of the tweeter 7 and to which the capacitor 12 is fixedly connected, is fitted into the claw 14 of the supporter 30 to connect the terminals 15 and 16 of the tweeter 13 and the lead wires 8 and 9 of the coil 1.

Further, the lower portion of the supporter 30 and the woofer 17
The upper and lower surfaces of the dustproof cushion 21 are fixed between the vibration plates 22, and the vibration plate 22 has its peripheral edge fixed to the frame 23, and the central part is connected to the voice coil 18. The lead wire of the voice coil 18 is provided on the surface of the diaphragm 22 with the gold wire 2.
4 and 25 respectively, one end of the gold thread wires 24 and 25 is soldered to the terminals 15 and 29 of the tweeter 13 so that the woofer 17 and the tweeter 13 are connected in parallel, and the other end is fixed to the frame 23. The terminals 27 and 28 of the terminal plate 26 are connected.

Next, the ribs 32, the grooves 4 and 5, and the triangular protrusions 6 and 7 provided on the supporter 30 will be described in some detail. FIG. 2 is an enlarged perspective view of the upper portion of the supporter 30.

In FIG. 2, three ribs 32 are provided at 120 ° intervals, and the diameter of the central space formed by these ribs 32 is larger than the outer diameter D of the coil 1 at the upper part thereof and the height H of the coil 1 is high. At a deep place, the diameter is set to be slightly smaller than the outer diameter D. That is, each rib 32 has a vertical gradient, and when the coil 1 is inserted into this space, the rib 32 presses the outer periphery of the lower portion of the coil 1 to fix the coil 1.

Further, triangular projections 6 and 7 are provided inside the first grooves 4 and 5, and the tips of the projections 6 and 7 and the grooves 4 and 5 are provided.
There are gaps 10 and 11 between them and the side wall. The dimension L of the gaps 10 and 11 is finished to a dimension L <d which is slightly smaller than the diameter dimension d of the lead wires 8 and 9 of the coil 1, and the lead wires 8 and 9 are passed through the gaps 10 and 11 from above to form the protrusions 6. Lead wires 8 and 9 are arranged at the bottom of 7.

Next, the cross-sectional structure of this composite type speaker will be described. FIG. 3 is a structural cross-sectional view of the composite type speaker in one embodiment of the present invention.

In FIG. 3, the lower plate 19 having the center pole 33, the ring-shaped magnet 34, and the ring-shaped upper plate 35 constitute a magnetic circuit 36, and the frame 23 is coupled to the upper surface thereof. In addition, the suspension 38 is arranged so that the lower portion of the voice coil 18 is properly fitted into the magnetic gap 37 of the magnetic circuit 36.
The central portion of the diaphragm holds the hollow portion of the voice coil 18 and fixes the peripheral edge portion to the frame 23, and the peripheral edge portion of the diaphragm 22 is attached to the frame 23 together with the gasket 39.
The central part of the woofer is connected to the upper part of the voice coil 18.
Make up 7.

Next, the tweeter 13 will be described. A magnetic circuit is constituted by a cylindrical plate 41 and a cylindrical plate 42 inside the yoke 40, and a housing 43 is fixed to the outside of this magnetic circuit. Further, the voice coil 45 is coupled to the lower side of the diaphragm 44, and the lower portion of the voice coil 45 is correctly fitted in the magnetic gap 46. Further, the equalizer 47 is arranged above the diaphragm 44 to form the tweeter 13.

With such a structure, the coil 1 is supported by the supporter 3
The rib 3 is inserted into the hollow portion 31 of 0 and pressed down.
2 also effectively utilizes the elasticity and viscosity of the resin to press the lower outer peripheral portion of the coil 1 to securely fix the coil 1. Furthermore, the tweeter 13 is fitted into the claw 14 from above and fixed, and the triangular protrusion 6 provided in the groove 4 of the supporter 30.
The lead wire 8 of the coil 1 is arranged at the bottom of the coil 1, and the end of the lead wire 8 is soldered to the terminal 15 of the tweeter 13.

Further, the nut 48 previously mounted inside the supporter 30 is tightened by the screw 20 inserted from the bottom surface of the lower plate 19 to join the supporter 30, and the cylindrical shape between the supporter 30 and the diaphragm 22. The upper and lower surfaces of the dustproof cushion 21 are attached to form a composite speaker.

With the above-mentioned structure, the coil 1 is surely pressed and fixed by the three ribs 32, so that the diaphragm 22 is fixed.
Even when the supporter 30 and the coil 1 are excited and the inner wall of the hollow portion 31 of the supporter 30 and the outer periphery of the coil 1 can be completely separated from each other, an abnormal sound called flicker does not occur.

The grooves 4 and 5 are the lead wires 8 of the coil 1,
Since 9 is separated from the root, it is possible to prevent the lead wires 8 and 9 from coming into contact with each other, and the lead wires 8 and 9 are not
By arranging it at the bottom of the support, no flicker is generated between the lead wires 8 and 9 and the supporter 30. Further, since the lead wires 8 and 9 do not come into contact with the yoke 40 of the tweeter 13, it is possible to avoid a short circuit between them.

Further, a rib 32 is provided as a bottom surface receiver of the coil 1.
It is effective to provide the flat portion 49 at the lower end of the coil 1, because the position of the coil 1 is determined and the uniformity is improved.

Next, the electrical relationship between the woofer 17 and the tweeter 13 will be described. FIG. 4 is an electric circuit diagram showing the relationship between the divided circuits of the speaker according to the embodiment of the present invention.

As can be seen from FIG. 4, the woofer 17 directly receives the input signal, and the input signal in which the low frequency component is cut off by −12 dB / Oct.

The operation of the composite speaker constructed as described above will be described below. First, woofer 1
When an input signal is applied from the terminals 27 and 28 of 7, the voice coil 18 moves up and down according to Fleming's left hand rule, and this force causes the diaphragm 22 to oscillate and emit sound into the air. In addition, the high frequency component of the input signal is the tweeter 13.
Is supplied to the voice coil 45 of the
Oscillates and emits a high tone in the air.

As described above, according to this embodiment, three ribs 32 are provided in the hollow portion 31 of the supporter 32, and the diameter of the central space formed by these ribs 32 is the outer diameter D of the coil 1 at the upper portion. The outer diameter of the coil 1 is slightly smaller than the outer diameter D at a depth deeper than the height H of the coil 1, and the coil 1 is inserted and fitted in this space to attach an adhesive to the outer peripheral portion of the coil 1. Coil 1 and supporter 30 without applying
It is possible to provide a high-quality speaker at a low cost without causing an abnormal sound due to contact with the inner wall of the device, and at a high productivity because a drying process is unnecessary.

In the embodiment, three ribs 32 for holding the coil 1 are formed in the hollow portion 31 of the supporter 30, but if the structure is such that the coil 1 can be held securely, the number of ribs is four. It may be more than.

[0032]

As described above, according to the present invention, three or more ribs for holding the coil are provided in the hollow portion of the supporter, and the diameter of the central space formed by these ribs is larger than the outer diameter of the coil in the upper portion. However, by making it slightly smaller than the outer diameter of the coil at a place deeper than the height of the coil, the coil is reliably held inside the supporter without applying adhesive to the outer periphery of the coil, and abnormal noise is generated. It is possible to realize at low cost a composite type speaker with excellent quality.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a composite speaker according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a coil and a supporter of the composite speaker according to the embodiment.

FIG. 3 is a structural cross-sectional view of a composite speaker in the same example.

FIG. 4 is an electric circuit diagram showing a relationship between division circuits of the composite-type speaker in the embodiment.

FIG. 5 is an exploded perspective view of a conventional composite speaker

[Explanation of symbols]

 1 Coil 4,5 Groove 6,7 Protrusion 8,9 Lead wire 10,11 Gap 12 Capacitor 13 Tweeter 14 Claw 15, 16, 27, 28, 29 Terminal 17 Woofer 18 Voice coil 19 Lower plate 20 Screw 21 Dustproof cushion 22 Vibration Plate 23 Frame 24, 25 Gold wire 26 Terminal plate 30 Supporter 31 Hollow part 32 Rib

Claims (1)

[Claims] 1. A supporter having a hollow portion that is coupled to a magnetic circuit of a low-pitched sound reproducing speaker unit and supports the mid-high-pitched sound reproducing speaker unit, and three or more ribs are arranged in the hollow portion. The diameter of the central space formed by the ribs is set to be larger than the outer diameter of the coil in the upper portion, and at a place deeper than the height of the coil, the diameter is set to be slightly smaller than the outer diameter of the coil. The split circuit coil is inserted and fitted, and further, the supporter is provided with two grooves, and a triangular protrusion is provided inside the groove, and the gap between the tip of the protrusion and the side wall of the groove is provided in the coil lead wire. Is smaller than the diameter dimension of the speaker, and the lead wire is arranged at the bottom of the protrusion.