CN210629206U - Armature and sound receiver motor - Google Patents

Abstract

An armature and an acoustic receiver motor. An armature for an acoustic receiver motor, the armature comprising: a first flange having a first flat portion having an immovable portion configured to be fixed to a yoke, the first flange extending along a length direction of the armature; a groove formed in each side of the immovable portion; a second flange having a second flat portion with a movable portion, the second flange extending along a length of the armature; and a curved portion interconnecting the first flange and the second flange in such a manner that the first flat portion and the second flat portion substantially face each other.

Description

Armature and sound receiver motor

Technical Field

The present disclosure relates to acoustic receiver motors, and more particularly, to armatures for acoustic receiver motors and acoustic receiver motors incorporating armatures.

Background

Various types of microphones and receivers have been used for many years. In these devices, the different electrical components are housed together within a housing or assembly. These devices may be in hearing instruments such as hearing aids, personal audio headsets, and other electronic devices such as cellular telephones and computers.

Generally, an acoustic receiver includes a motor including a coil, an armature (or reed), and a yoke supporting a magnet. The magnet, coil, armature and yoke together form a magnetic circuit. In operation, an electrical signal applied to the coil generates a magnetic field which causes the armature to move relative to the magnet. Movement of the armature causes movement of the diaphragm, which produces a sound that is presented to the viewer.

In some motors, the armature is formed as a U-shaped member having one flange welded to the yoke. However, conventional yokes have a large radius, which creates a gap between the yoke and the outer edge of the armature. This gap makes it difficult to weld the armature to the yoke.

All these limitations in the manufacture of acoustic receiver motors have severely affected the development of this field and must therefore be overcome.

SUMMERY OF THE UTILITY MODEL

The present invention is designed to overcome or at least alleviate these technical limitations in the prior art.

An object of the present invention is to provide an armature for an acoustic receiver motor, wherein the armature is configured to be suitable for welding the armature to a yoke without degrading the magnetic properties of the armature.

A first aspect of the present invention provides an armature for an acoustic receiver motor, the armature comprising: a first flange having a first flat portion with an immovable portion configured to be fixed to a yoke, the first flange extending along a length of the armature; a groove formed in each side of the immovable portion; a second flange having a second flat portion with a movable portion, the second flange extending along a length of the armature; a curved portion interconnecting the first flange and the second flange with the first flat portion generally facing the second flat portion.

According to a second aspect of the invention, the width of the first flange is greater than the width of the second flange, the grooves being arranged directly opposite each other, wherein the spacing between the grooves is at least as large as the width of the second flat portion.

According to a third aspect of the invention, the slots are arranged staggered with respect to each other along the length direction of the first flange.

According to the utility model discloses a fourth aspect, the width on the first edge of a wing is greater than the width on the second edge of a wing.

According to a fifth aspect of the present invention, the armature further comprises a projection, the projection being provided at opposite side faces of the movable portion of the second flange.

According to a sixth aspect of the invention, the movable portion comprises a tapered portion that narrows gradually towards the end of the second flange.

According to a seventh aspect of the present invention, there is provided an acoustic receiver motor, comprising: according to an aspect of the present invention, there is provided an armature; a yoke holding first and second magnets separated by a certain gap therebetween, wherein the immovable portion of the armature is provided on and supported by the yoke with no gap between the yoke and the sides of the slots, the immovable portion of the armature is fixed to the yoke by welds at the respective slots, and the movable portion of the armature is at least partially disposed in the gap between the first and second magnets; and a coil magnetically coupled to the armature.

According to an eighth aspect of the present invention, the acoustic receiver motor is combined with: a housing; a diaphragm disposed within the case and dividing the case into a back volume and a front volume including a sound hole, the armature, the yoke, and the coil being disposed in the back volume; and a linkage interconnecting the diaphragm and the movable portion of the armature.

Drawings

The objects, features and advantages of the present invention will become apparent from the following detailed description of the various aspects of the invention, when taken in conjunction with the following drawings:

fig. 1A illustrates a conventional design of an armature.

Fig. 1B illustrates a conventional acoustic receiver motor.

Fig. 2 is a front view showing a conventional acoustic receiver motor.

Fig. 3 illustrates a first example of an armature according to an embodiment of the present invention.

Fig. 4 illustrates a second example of an armature according to an embodiment of the present invention.

Fig. 5 illustrates a third example of an armature according to an embodiment of the present invention.

Fig. 6 illustrates a fourth example of an armature according to an embodiment of the present invention.

Fig. 7A illustrates a fifth example of an armature according to an embodiment of the present invention.

Fig. 7B is a top view illustrating the armature shown in fig. 7A according to an embodiment of the present invention.

Fig. 8 illustrates a combined armature and yoke according to an embodiment of the invention.

Fig. 9 illustrates an acoustic receiver including an armature according to an embodiment of the present invention.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity. It will be understood that the terms and expressions used herein have the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein.

Detailed Description

While the present invention may be embodied in many different forms, there is shown in the drawings and will herein be described in detail preferred embodiments of the invention with the understanding that the present disclosure is to be considered as an example of the principles of the invention and not intended to limit the broad aspects of the invention to the embodiments illustrated.

In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without limitation to these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the present invention.

Fig. 1A illustrates a conventional design of an armature 10. As shown, the armature 10 is configured in a generally U-shaped configuration. The armature 10 includes a first flange 10a having a first flat portion and a second flange 10b having a second flat portion. The first and second flanges 10a and 10b are connected to each other by a bent portion 10c such that the first and second flanges 10a and 10b face each other.

Fig. 1B illustrates a conventional acoustic receiver motor 100. The motor 100 includes an armature 110, a yoke 120, a coil 130, and a magnet 140. The armature 110 is formed as a substantially U-shaped member, and is welded to the yoke 120 after being formed. The armature 110 may be the conventional armature 10 shown in fig. 1A.

Conventional designs of armatures and yokes have many limitations. For example, in the process of manufacturing the acoustic receiver motor, the yoke and the armature are separately formed. Wherein, the yoke is formed by a stamping and bending process. However, the radius of the contour of the yoke formed by the press bending process is determined by the thickness of the raw material, which is an uncontrollable parameter. This makes it difficult to fix the armature to the yoke.

As shown in fig. 1B, the first flange of the armature 110 is disposed on top of the yoke 120. It can be seen that the first flange of the armature is larger in the lateral direction than the plane of the yoke 120, making it difficult to weld the armature to the yoke. Fig. 2 provides a detailed view of this configuration.

Fig. 3 illustrates a first example of an armature according to an embodiment of the present invention.

As shown in fig. 3, the armature 300 is configured in a substantially U-shaped structure. Armature 300 includes a first flange 310a having a first flat portion and a second flange 310b having a second flat portion. Both first and second flanges 310a and 310b extend primarily from their rear portions interconnected by bend 320 to their front portions along their length such that first and second flanges 310a and 310b face each other. The front of the first flat portion of the first flange 310a of the armature 300 is an immovable portion. The immovable part is to be fixed to a yoke (not shown) by welding, for example. The front of the second flat portion of the second flange 310b of the armature 300 has a movable portion. The movable part extends into a coil (not shown here) and is capable of moving in the presence of a changing magnetic field. Movement of the movable portion of the second flat portion of the second flange 310b will in turn cause movement of the diaphragm (not shown here) to generate acoustic energy in the front volume of the housing of the acoustic receiver motor.

In some but not all implementations, the armature 300 is also provided with bumps on opposite sides of the movable portion of the second flange 310b to prevent vibration.

As shown in fig. 3, the first flange 310a of the armature 300 includes at least one cut-out. In a first example, the at least one cut-out is constituted by a groove 360. A slot 360 is provided at the front of first flange 310 a. More specifically, the groove 360 is formed in each side of the first flat portion of the first flange. With the groove 360, the width of the immovable portion to be welded to the yoke becomes smaller than the width of the flat top surface of the yoke. As a result of reducing the area of the first flange 310a of the armature, the portion of the armature welded to the yoke is fully supported by the yoke, wherein no gap is created at the edges. The supported armature can be effectively welded to the yoke. It should be noted that the location, shape, size and/or number of the slots may vary depending on the particular application. This means that the at least one cut-out can be changed as desired. Therefore, if the example receiver motor described herein has a yoke formed by press bending, the present invention can be applied to other yokes (multi-layer yokes) different in size or shape to form a gap between the outer edge of the armature and the yoke.

Fig. 4 illustrates a second example according to an embodiment of the present invention. This example is identical to the first example shown in fig. 3, except that the movable portion of the second flange is tapered to improve the high frequency response.

Fig. 5 illustrates a third example of an armature according to an embodiment of the present invention. This example is identical to the first example shown in fig. 3, except that the at least one cut-out is different. Specifically, in this example, as shown in FIG. 5, the slot 560 is different from the slot 360 shown in FIG. 3. Specifically, groove 560 is disposed along the length of first flange 510 a. In this example, slots 560 are provided as two separate half-holes at opposite sides of first flange 510a of armature 500 along the length of first flange 510a of armature 500. In other embodiments, the shape of the groove 560 may be polygonal rather than circular.

The slots may be provided at any position where the armature overlaps the yoke, as long as the arrangement of such slots can provide a larger space for the fixation of the armature.

Fig. 6 illustrates a fourth example of an armature according to an embodiment of the present invention. This example is identical to the third example shown in fig. 5, except that the movable portion of the second flange is tapered.

Fig. 7A illustrates a fifth example of an armature according to an embodiment of the present invention. It can be seen that the armature 700 shown in fig. 7A is identical to the third example shown in fig. 5, except that the slots are provided at slightly different locations. Specifically, in this example, channels 760 are offset on opposite sides of first flange 710a along the length of first flange 710 a. Of course, the location, size and number of the grooves are not limited thereto.

Fig. 7B is a top view illustrating the armature shown in fig. 7A according to an embodiment of the present invention.

Fig. 8 illustrates an assembled acoustic receiver motor 800 according to an embodiment of the present invention. In addition to the armature 300 described with reference to fig. 3, the assembly includes a yoke, a coil, and a magnet. As shown, the yoke holds magnets separated by a certain gap. The immovable portion of the first flange of the armature is disposed on and supported by the yoke, wherein there is no gap between the yoke and the side of the slot. The non-movable portion of the armature is fixed to the yoke by welding in the cut-out or slot. Reference numeral 880 denotes a welded portion of the armature and the yoke. The movable portion of the second flange of the armature is at least partially disposed in the gap between the magnets. The coil is disposed around the second flange of the armature.

Fig. 9 illustrates an acoustic receiver including an armature according to an embodiment of the present invention. As shown, the acoustic receiver motor is housed in a housing 900. In addition, the housing includes a diaphragm dividing the housing into a back volume and a front volume, the front volume including an acoustic aperture, and the armature, yoke, and coil are disposed in the back volume. In addition, a link (not shown here) interconnecting the movable part of the armature and the diaphragm is also accommodated in the housing.

Many variations and modifications may be made to the embodiments without substantially departing from the principles of the present invention. All such variations and modifications are intended to be included within the scope of the present invention. Accordingly, the above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention.

Claims (8)

1. An armature for an acoustic receiver motor, the armature comprising:

a first flange having a first flat portion having an immovable portion configured to be fixed to a yoke, the first flange extending along a length direction of the armature;

a groove formed in each side of the immovable portion;

a second flange having a second flat portion with a movable portion, the second flange extending along a length of the armature; and

a curved portion interconnecting the first flange and the second flange in such a manner that the first flat portion and the second flat portion face each other.

2. The armature of claim 1 wherein the width of the first flange is greater than the width of the second flange, the slots being disposed directly opposite each other, wherein the spacing between the slots is at least as great as the width of the second flat portion.

3. The armature of claim 1 wherein the slots are offset from one another along the length of the first flange.

4. The armature of claim 3 wherein the width of the first flange is greater than the width of the second flange.

5. The armature of claim 1 further comprising tabs disposed at opposite sides of the movable portion of the second flange.

6. The armature of claim 1 wherein the movable portion includes a tapered portion that tapers toward an end of the second flange.

7. An acoustic receiver motor, comprising:

the armature of any one of claims 1 to 6;

a yoke holding first and second magnets separated by a gap therebetween, wherein the immovable portion of the armature is disposed on the yoke and supported by the yoke with no gap between the yoke and sides of the slots, the immovable portion of the armature is fixed to the yoke by welds at the respective slots, and the movable portion of the armature is at least partially disposed in the gap between the first and second magnets; and

a coil magnetically coupled to the armature.

8. The acoustic receiver motor of claim 7, further in combination with:

a housing;

a diaphragm disposed within the housing and separating the housing into a back volume and a front volume, the front volume including a sound hole, and the armature, the yoke, and the coil being disposed in the back volume; and

a linkage interconnecting the diaphragm and the movable portion of the armature.

Images