CN210694343U

CN210694343U - Armature and sound receiver motor

Info

Publication number: CN210694343U
Application number: CN201921709498.3U
Authority: CN
Inventors: 张亚辉
Original assignee: Roche Ipc Malaysia Sdn Bhd
Current assignee: Roche Ipc Malaysia Sdn Bhd; Knowles IPC M Sdn Bhd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-06-05
Anticipated expiration: 2029-10-12

Abstract

An armature and an acoustic receiver motor. An armature for an acoustic receiver, 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 an armature, the first flange including at least one cut-out disposed through the first flat portion; and 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.

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 used 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, 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 (flange) welded to the yoke. During motor assembly, a damping compound (damping compound) is applied between the armature and the coil to reduce vibration of the armature. The damping compound is applied from both sides of the acoustic receiver motor. However, applying the damping compound from both sides of the motor is laborious and is limited by the inability to apply continuously due to the location and limited space between the coil and the armature.

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.

It is an object of the present invention to provide an armature for an acoustic receiver motor, which armature is adapted to apply a damping compound to the acoustic receiver motor more easily and continuously.

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, the first flange including at least one cut-out formed through a depth of the first flat 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 in such a manner that the first flat portion faces the second flat portion.

According to a second aspect of the invention, the at least one cut-out comprises a hole between opposite sides of the first flat portion. In an implementation, the aperture is centrally located between the opposing sides of the first flat portion.

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

According to a fourth aspect of the present invention, the at least one cut-out includes a groove formed in each side of the first flat portion.

According to a fifth aspect of the invention, the grooves are arranged directly opposite each other.

According to a sixth aspect of the present invention, the grooves are arranged to be staggered with respect to each other along the length direction of the first 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 a first magnet and a second magnet separated by a certain gap therebetween, wherein the immovable portion of the armature is fixed to the yoke and the movable portion of the armature is at least partially disposed in the gap between the first magnet and the second magnet; a coil disposed around the second flange of the armature; and a damping compound provided at least at the at least one cut-out between the first flat portion of the armature and the coil.

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 cross-sectional 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. 5A illustrates a third example of an armature according to an embodiment of the present invention.

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

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

Fig. 7 illustrates a combined armature and yoke according to an embodiment of the invention.

Fig. 8 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, applying damping compound from both sides of the motor is laborious and discontinuous due to the location and limited space between the coil and the armature.

As shown in fig. 1B, after being welded to the yoke 120, the first flange of the armature 110 is disposed on the top of the yoke 120. Fig. 2 is a front view illustrating the acoustic receiver motor 100 illustrated in fig. 1B.

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 the first and

second flanges

310a and 310b extend mainly from their rear portions, which are connected to each other by the bent portion 320, to their front portions along the length direction of the armature 300 such that the 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 will be fixed to the yoke (not shown here), for example by welding. Further, 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.

Fig. 3 shows the difference between the present invention and a conventional armature. 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 hole 350. Aperture 350 is disposed between opposite sides of the first flat portion of first flange 310 a. Hole 350 is formed through the depth of first flange 310 a. In fig. 3, the aperture 350 is centrally disposed between the opposite sides of the first flat portion of the first flange 310 a. However, in other embodiments, the aperture 350 may not be centrally located between the opposing sides of the first flat portion and may extend to the sides. The provision of the cut-out allows the application of damping compound to the acoustic receiver motor to be performed more continuously and with less hindrance than prior art armatures. Thus, the at least one cut-out may facilitate automation. It should be noted that the location, shape, size and/or number of the holes may vary depending on the particular application. This means that the at least one cut-out can be changed as desired.

Returning now to conventional designs, the application of the damping compound must be performed manually from the side of the motor. By providing an aperture 350 at the top of the first flange 310a, the damping compound can be applied from the top of the motor.

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. 5A 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. 5A, the at least one cut-out is implemented as

grooves

560a and 560b disposed along the length direction of first flange 510 a. In this example,

slots

560a and 560b are offset along the length of first flange 510 a. Of course, the

slots

560a and 560b may be arranged in a different manner. For example, as shown in FIG. 5B, slots 560a and 560B also extend along the length of first flange 510 a. However, in this example, the

grooves

560a and 560b are formed directly opposite to each other.

Fig. 6 illustrates a fifth example according to an embodiment of the present invention. This example is identical to the third example shown in fig. 5A, except that the movable portion of the second flange is tapered to improve the high frequency response.

Fig. 7 illustrates an assembled acoustic receiver motor according to an embodiment of the present invention. In addition to the armature 300 described with reference to fig. 3, the assembly also includes a yoke, coils, magnets, and a damping compound 770. As shown, the yoke holds magnets separated by a certain gap. The immovable portion of the first flange of the armature is fixed to the yoke by welding. 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. After the above components are assembled into a motor, a damping compound is applied to the motor. The damping compound is injected into the space between the first flange of the armature and the coil through a cut-out provided in the first flange. In fig. 7, a damping compound 770 is applied to the motor through the holes. In other embodiments, the damping compound is applied to the motor via a cut-out provided at a side portion of the first flange of the armature. For example, in fig. 5A and 5B, the damping compound is applied to the motor via slots 560a and 560B.

Fig. 8 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 800. 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. Numeral 870 represents a damping compound applied between the first flange of the armature and the coil.

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

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 of the armature, the first flange including at least one cut-out disposed through the first flat portion; and

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 at least one cut-out comprises an aperture between opposing sides of the first flat portion.

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

4. The armature of claim 1, wherein the at least one cut-out comprises a slot formed in each side of the first flat portion.

5. An armature according to claim 4, wherein the slots are disposed directly opposite each other.

6. The armature of claim 4 wherein the slots are offset from one another along the length of the first flange.

7. An acoustic receiver motor, comprising:

the armature of any one of claims 1 to 6;

a yoke holding a first magnet and a second magnet separated by a certain gap therebetween, wherein the immovable portion of the armature is fixed to the yoke and the movable portion of the armature is at least partially disposed in the gap between the first magnet and the second magnet;

a coil disposed around the second flange of the armature; and

a damping compound located at the at least one cut-out between the first flat portion of the armature and the coil.

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.