JPH0518198U - Speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] Impairing reliability by devising the shape of the frame so that the mechanical strength of the frame can be increased by using a yoke, etc., and selecting a magnetic circuit according to it. A speaker that can reduce the weight of the frame is provided. [Structure] A gap G is provided between a yoke 11 and a top plate 13 in which a side wall 11a is provided upright around a magnet 12.
And the voice coil 14 is arranged in the gap G, and the yoke 11 is attached to the frame 18 made of a metal plate.
Bottomed tubular portion 18a fitted and fixed to the yoke 11
And a reinforcing rib 18c formed by partially protruding the bottomed tubular portion 18a and the annular collar portion 18b outward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speaker suitable for in-vehicle use, and more particularly, to a measure for reducing the weight of a metal plate frame that supports a diaphragm.

[0002]

[Prior Art]

 FIG. 3 is a sectional view showing a conventional general speaker.

The loudspeaker illustrated in FIG. 1 has a yoke 1 on which a center pole 1 a is erected, a ring-shaped magnet 2 placed on the yoke 1 and surrounding the center pole 1 a, and placed on the magnet 2. A magnetic circuit is constituted by the formed top plate 3 and the voice coil 4 of the vibration system is arranged in a gap G formed between the outer peripheral surface of the center pole 1a and the inner peripheral surface of the top plate 3. The diaphragm 5 made of cone paper or the like vibrates through the voice coil 4. Here, the vibrating plate 5 is supported by a flowerpot-shaped frame 8 made of an iron plate or the like, with a tip portion on the outer peripheral side via a cone edge 6 and a central portion on the inner peripheral side via a damper 7. The frame 8 is fixed by caulking the annular bottom plate portion 8a with the boss 3a of the top plate 3. In the figure, reference numeral 9 indicates a gasket, and reference numeral 10 indicates a center cap.

[0004]

[Problems to be solved by the device]

 By the way, in the case of a vehicle-mounted speaker or a wall-mounted speaker, it is strongly desired to reduce the weight of the speaker body, and therefore, an attempt has been made to reduce the weight of the frame 8 which is usually made of an iron plate having a thickness of 0.6 to 1.0 mm. ing. Specifically, the proposal is to reduce the plate thickness of the frame 8 or use an aluminum alloy instead of the iron plate, but if such a proposal is applied to the conventional structure shown in FIG. There is a high risk that the annular bottom plate 8a, which is crimped to No. 3 and has a large load, lacks in mechanical strength to cause deformation or deterioration of mounting strength. For example, when the annular bottom plate 8a is deformed, the voice coil in the gap G is increased. The position of 4 may change and the sound quality may be significantly deteriorated. Further, if the mounting strength of the caulking portion of the annular bottom plate 8a deteriorates, the frame 8 may come off the top plate 3. In other words, if the frame 8 is made lighter with the conventional structure, the frame 8 itself is likely to be deformed or dropped from the magnetic circuit, resulting in a decrease in reliability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a speaker that can reduce the weight of a frame without impairing reliability.

[0006]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to form a gap between a yoke on which a magnet is placed and a side wall is erected around the magnet and a top plate which is placed on the magnet, and which is formed in the gap. A voice coil is arranged, and a bottomed cylindrical portion in which the yoke is fitted and fixed to the yoke made of a metal plate frame, an annular collar portion surrounding the opening end of the bottomed cylindrical portion, and the above This is achieved by providing reinforcing ribs formed by partially bulging the bottom tube portion outward.

[0007]

[Action]

 If the bottomed tubular portion of the frame is fixed while being fitted onto the yoke of the magnetic circuit, the mechanical strength and mounting strength of the bottomed tubular portion will be increased, and the frame of the frame surrounding the open end of the bottomed tubular portion will be improved. Since the mechanical strength of the annular flange can be secured by the reinforcing ribs, reliability is not impaired by using a frame of this shape even if the material is an aluminum alloy or a thin iron plate.

[0008]

【Example】

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

FIG. 1 is a sectional view showing an embodiment of a speaker according to the present invention, and FIG. 2 is a bottom view of a frame used in the same embodiment.

The speaker shown in these figures includes a yoke 11 having a substantially U-shaped cross section in which a cylindrical side wall 11a is provided upright, and a magnet 12 placed on the yoke 11 and surrounded by the side wall 11a. A magnetic circuit is constituted by the top plate 13 placed on the magnet 12, and is placed in a gap G formed between the inner peripheral surface of the upper end of the yoke 11 and the outer peripheral surface of the top plate 13. A voice coil 14 of a vibration system is arranged, and a diaphragm 15 made of cone paper vibrates via the voice coil 14. The material and shape of the frame 18 supporting the diaphragm 15 via the cone edge 16 and the damper 17 are very different from those of the conventional product, and the yoke 11 is fitted and inserted into the frame 18 made of aluminum alloy. And a first reinforcing rib 18c for reinforcing the annular flange portion 18b surrounding the open end of the bottomed tubular portion 18a, and a taper portion surrounding the diaphragm 15. A second reinforcing rib 18e for reinforcing 18d is provided. Here, the first reinforcing rib 18c is formed by partially protruding the outer peripheral surfaces of the bottomed tubular portion 18a and the annular collar portion 18b outward, and the second reinforcing rib 18e is formed by the tapered portion. The outer peripheral surface of 18d is partially raised outward, and the first and second reinforcing ribs 18c and 18e are respectively formed at four positions on the frame 18 at equal intervals (see FIG. 2). ). In FIG. 1, reference numeral 19 is a gasket, reference numeral 20 is a center cap, and reference numeral 21 is a mounting screw.

Although the above-mentioned speaker uses a frame 18 made of aluminum alloy for the purpose of weight reduction, the bottomed tubular portion 18a of the frame 18 is fixed to the yoke 11 of the magnetic circuit in an externally fitted state. Therefore, the bottomed tubular portion 18a is reinforced on the entire outer surface of the yoke 11 to enhance the mechanical strength and mounting strength. In other words, the load on the bottomed tubular portion 18a is dispersed. As a result, stress concentration is less likely to occur. Therefore, even if it is made of aluminum alloy, the bottomed tubular portion 18a is less likely to be deformed, and the frame 18 does not fall off from the magnetic circuit. Further, since the bottomed tubular portion 18a is less likely to be deformed, a certain amount of load is expected on the annular brim portion 18b of the frame 18. Since the second reinforcing rib 18e secures the mechanical strength of the tapered portion 18d, the tapered portion 18d is also less likely to be deformed. That is, the weight of the frame 18 is reduced while ensuring the required mechanical strength and mounting strength, and the weight of the speaker body is reduced without impairing reliability.

When it is determined that the taper portion 18d of the frame 18 is not subjected to a large load that causes deformation, the second reinforcing rib 18e may be omitted and the first reinforcing rib 18e may be omitted. As for 18c, the number and shape of 18c may be appropriately selected according to the mechanical strength of the annular collar portion 18b.

In the above embodiment, the weight of the frame 18 is reduced by using aluminum alloy as the material, but the weight of the frame 18 may be reduced by using other light metal or a thin iron plate.

[0014]

[Effect of the device]

 As described above, according to the present invention, the bottomed cylindrical portion of the frame fixed to the yoke of the magnetic circuit is reinforced by the yoke, and the annular flange surrounding the open end of the bottomed cylindrical portion is also a reinforcing rib. Since it is reinforced, the required mechanical strength and mounting strength can be secured even if the frame is made lighter by using an aluminum alloy or a thin iron plate, etc., and the speaker body can be made lighter without impairing reliability. realizable.

[Brief description of drawings]

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

FIG. 2 is a bottom view of the frame used in the example.

FIG. 3 is a cross-sectional view showing a conventional general speaker.

[Explanation of symbols]

 11 yoke 11a side wall 12 magnet 13 top plate 14 voice coil 15 diaphragm 18 frame 18a bottomed cylinder portion 18b annular flange portion 18c reinforcing rib G gap

Claims (1)

[Scope of utility model registration request] 1. A speaker in which a frame made of a metal plate for supporting the diaphragm is provided around the diaphragm vibrating via a voice coil, and a side wall is provided around the magnet by mounting a magnet. Form a gap between the yoke and the top plate placed on the magnet,
The voice coil is arranged in the gap, the bottomed tubular portion is fixed to the yoke by inserting the yoke into the frame, the annular collar portion surrounding the open end of the bottomed tubular portion, and the A speaker provided with a reinforcing rib formed by partially bulging a bottom tube portion outward.