CN211209921U

CN211209921U - Coil shaft for acoustic receiver, acoustic receiver motor, and acoustic receiver

Info

Publication number: CN211209921U
Application number: CN201922494438.0U
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: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-08-07
Anticipated expiration: 2029-12-31

Abstract

Coil shaft for an acoustic receiver, acoustic receiver motor and acoustic receiver. The coil shaft includes: a coil support member having an armature passageway extending between first and second ends of the coil support member; a first flange extending from the coil support member at a first end of the coil support member; a second flange extending from the coil support member at the second end of the coil support member, the coil support member supporting the coil between the first and second flanges; a shoulder provided at one side of a first flange, the first flange being located between the shoulder and the coil support member; a first electric terminal having one portion embedded in the shoulder and the other portion extending from the shoulder at one side of the armature passage; a second electrical terminal having a portion embedded in the shoulder and another portion extending from the shoulder on the other side of the armature passageway, the first and second electrical terminals being electrically isolated; a recess formed in the first flange at a location between the first and second electrical terminals such that the wire of the coil reaches the coil support member from the shoulder.

Description

Coil shaft for acoustic receiver, acoustic receiver motor, and acoustic receiver

Technical Field

The present disclosure relates generally to acoustic receiver motors and, more particularly, to coil shafts for acoustic receivers and acoustic receiver motors and acoustic receivers.

Background

Many hearing devices, such as hearing aids, earphones, personal audio headsets, include one or more acoustic receivers. Such acoustic receivers generally include a housing or enclosure containing a diaphragm that divides the interior of the enclosure into a front cavity volume and a back cavity volume. The motor located in the back volume comprises a coil with a passage for the armature (reed) to be placed. The armature has a stationary end fixed to the yoke and another end movably disposed between magnets supported by the yoke. A drive rod or linkage (link) couples the armature to the diaphragm. In operation, an electrical signal applied to the coil causes the armature to vibrate between the magnets. The vibrating armature causes the diaphragm to move, causing sound to be emitted from the aperture in the front volume of the housing. In some acoustic receivers, the coil comprises an insulated wire wound around a bobbin having a passage for the armature to extend. However, winding the coil around the coil axis and connecting the wire of the coil to the terminal is very laborious and costly.

All these limitations of manufacturing acoustic receivers 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.

A first aspect of the invention provides a coil shaft for an acoustic receiver, the coil shaft comprising a coil support member having an armature passageway extending between a first end and a second end of the coil support member; a first flange extending from the coil support member at the first end of the coil support member; a second flange extending from the coil support member at the second end of the coil support member, wherein the coil support member is configured to support a coil between the first flange and the second flange; a shoulder provided on one side of the first flange such that the first flange is located between the shoulder and the coil support member; a first electrical terminal located at one side of the armature passage, a portion of the first electrical terminal embedded in the shoulder and another portion of the first electrical terminal extending from the shoulder; a second electrical terminal on the other side of the armature passage, a portion of the second electrical terminal embedded in the shoulder and another portion of the second electrical terminal extending from the shoulder, the second electrical terminal electrically isolated from the first electrical terminal; and a recess formed in the first flange at a position between the first and second electric terminals such that a wire of the coil reaches the coil support member from the shoulder.

According to a second aspect of the invention, the end of the first flange near the second electrical terminal comprises a cut-out configured to provide a passage for the coil.

According to a third aspect of the invention, the shoulder comprises a wall extending at an angle relative to the first flange, wherein the wall and the recess provide a passage for the wire of the coil.

According to a fourth aspect of the present invention, the coil support member, the first flange, the second flange and the shoulder portion form a single member.

According to a fifth aspect of the invention, portions of the first flange and the second flange protrude with respect to the shoulder.

According to a sixth aspect of the present invention, the portions of the first and second electrical terminals embedded in the shoulder have an anchoring configuration.

A seventh aspect of the present invention provides an acoustic receiver motor, comprising: the coil bobbin of the aspects as described above; a coil wound on a coil support part of the coil between the first flange and the second flange, wherein one end of the coil passes through the recess and is electrically connected to the first electric terminal through the shoulder, and the other end of the coil is electrically connected to the second electric terminal; an armature, a portion of the armature extending through an armature passageway provided by the coil shaft; a yoke holding a first magnet and a second magnet separated by a certain gap therebetween, wherein a non-movable portion of the armature is fixed to the yoke and a movable portion of the armature is at least partially disposed in the gap between the first magnet and the second magnet.

An eighth aspect of the present invention provides an acoustic receiver, comprising: an acoustic receiver motor as described above; a housing; a diaphragm disposed within the housing and separating the housing into a back volume and a front volume comprising a sound hole, wherein the acoustic receiver motor is 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. 1 illustrates a perspective view of one side of a coil shaft according to an embodiment of the present invention.

Fig. 2 illustrates a perspective view of the other side of the coil axis of fig. 1.

Fig. 3 is a side view showing a coil bobbin of fig. 1.

Fig. 4 illustrates a perspective view of the configuration of the electric terminal of the coil bobbin and an enlarged view of the electric terminal.

Fig. 5 illustrates a cross-sectional view of an acoustic receiver motor including a coil axis 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.

The coil bobbin 100 of the present embodiment includes a coil support member 101 (also shown as 101 in fig. 3 and 4 to be described later), a first flange 102, a second flange 103, a shoulder 104, and two

electric terminals

105a and 105 b. In a later stage, the coil shaft 100 will be assembled with an armature (not shown here) to form an acoustic receiver motor.

As shown in fig. 1, the coil support member 101 defines a size capable of supporting the coil 106 to be wound around the coil support member. Furthermore, the coil support member 101 also defines an interior space extending along the length of the coil axis between the first and second ends of said coil support member 101. The inner space has holes at first and second ends thereof, respectively, so that the inner space communicates with the outside.

The coil support member 101 is disposed between the first flange 102 and the second flange 103 of the coil shaft 100. A first flange 102 of the coil bobbin 100 extends transversely from the coil support member 101 at a first end of the coil support member, and a second flange 103 of the coil bobbin extends transversely from the coil support member 101 at a second end of the coil support member. Each of the first flange 102 and the second flange 103 has a hole substantially aligned with the hole of the coil support member 101, and the first and second flanges form a portion of the armature passage 107 together with the coil support member.

In the assembly process, the coil bobbin 100 is assembled with the armature in such a manner that the armature passage 107 allows the armature to pass through.

The shoulder 104 is attached to the coil support member 101 via the first flange 102. As shown, the shoulder 104 includes two arms extending parallel outward from the main body of the shoulder 104 along the length of the coil axis 100. The two arm portions are opposed to each other across the armature passage 107. That is, the first electrical terminal 105a is located on one side of the armature passage 107, and the second electrical terminal 105b is located on the other side of the armature passage 107. A portion of the first electrical terminal 105a is embedded in the shoulder, and more specifically, in a respective one of the arms of the shoulder, and extends outwardly therefrom. Similarly, a portion of the second electrical terminal 105b is embedded in the shoulder, more specifically, in the respective other arm of the shoulder, and extends outwardly therefrom. The first and second electrical terminals are electrically isolated from each other.

The coil shaft 100 further comprises a recess 108, the recess 108 allowing the wire of said coil 106 to reach the coil support part 101 from the shoulder 104. More specifically, as shown, the recess 108 is formed in the lower edge of the first flange 102 between the first electrical terminal 105a and the second electrical terminal 105 b.

As shown in fig. 2, the coil bobbin 100 may further include a cut-out 109 on the first flange 102 near the embedded portion of the second electrical terminal 105 b. More specifically, the cut-out portion 109 is formed at a corner of the lower edge of the first flange 102 near the second electric terminal 105 b.

In aspects of the present disclosure, the coil bobbin 100 may further include a wall portion 110, the wall portion 110 being formed on the coil bobbin at a position close to the second electric terminal 105 b. More specifically, as shown in FIG. 2, the wall 110 may be formed on a lower surface of the shoulder 104. The wall is angularly oriented with respect to the first flange 102 such that the angled wall 110 and the recess 108 form a passage between the shoulder 104 and the coil support member 101 for the wire of the coil 106 to pass through.

According to the embodiment described above with reference to fig. 1 and 2, the coil 106 is arranged around the coil support member 101 between the first flange 102 and the second flange 103. The wound coil is concave compared to the outermost edges of the first flange 102 and the second flange 103. Further, one end of the coil 106 passes through the recess 108 and the shoulder 104 and is electrically connected to the first electric terminal 105a, and the other end of the coil 106 is electrically connected to the second electric terminal 105 b. In the case where the cut-out portion 109 is provided, the other end of the coil passes through the cut-out portion 109 and is electrically connected to the second electric terminal 105 b.

In this embodiment, referring to fig. 1 and 2, the shoulder 104, the first flange 102 and the second flange 103 are manufactured as separate components that are to be assembled together in a subsequent assembly process by any known assembly technique. The present invention is not limited thereto. Alternatively, the three components of the shoulder 104, the first flange 102, and the second flange 103 may be formed as a single component. For example, the single component may be formed by an injection molding process of plastic or other non-conductive material.

Fig. 3 is a side view illustrating the coil bobbin 100 of fig. 1. As can be seen from this view, the lower edges of the first flange 102 and the second flange 103 protrude downward with respect to the lower surfaces of both the shoulder 104 and the coil support member 101. With this configuration, a space (indicated by an arrow) is formed between the wire of the coil and the bottom surface of the coil shaft, so that the wire can be prevented from contacting the bottom plate of the acoustic receiver, which contact may cause a short-circuit problem in use.

The provision of the recess 108, the cut-out 109 and the wall 110 may make it easy to wind the coil around the coil axis and connect the wire of the coil to the electrical terminal, and may accordingly reduce costs.

Fig. 4 illustrates a perspective view of the configuration of the electric terminal of the coil bobbin and an enlarged view of the electric terminal. As shown in fig. 4, the portions of the first and second electrical terminals that are embedded in the shoulders have an anchoring configuration (anchorage). More specifically, taking the first electric terminal as an example, the end of the embedded portion of this terminal is bent so that this portion can be anchored in the shoulder. The bond between the terminal and the plastic forming the shoulder is improved due to the bent end of the terminal which is enlarged in the figure.

Fig. 5 illustrates a cross-sectional view of an acoustic receiver having an acoustic receiver motor including a coil axis according to an embodiment of the present invention.

As shown, the acoustic receiver 500 includes a housing 501. The housing defines an interior volume and an exterior volume of the acoustic receiver 500. The interior volume of the housing 501 contains an acoustic receiver motor having the configuration of the coil shaft 100 described above with reference to fig. 1-4, and also includes some additional components including a diaphragm and a linkage. As described with reference to fig. 1 to 4, the acoustic receiver motor includes the coil shaft 100 as described above, the coil wound around the coil support member of the coil shaft between the first flange and the second flange, the armature, and the yoke.

The coil is disposed on the coil support member between the first flange and the second flange of the coil shaft while being recessed with respect to outermost edges of the first flange and the second flange. Further, one end of the coil passes through the recess 108 and the shoulder 104 and is electrically connected to the first electric terminal 105a, and the other end of the coil is electrically connected to the second electric terminal 105 b. In the case where the cut-out portion 109 is provided, the other end of the coil passes through the cut-out portion and is electrically connected to the second electric terminal 105 b.

A portion of the armature extends through an armature passage provided by the coil shaft 100 such that the armature can move within the armature passage.

The yoke holds a first magnet and a second magnet separated by a certain gap therebetween, 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.

Further, a diaphragm and a link are also provided in the housing 501. The diaphragm separates the interior volume of the housing 501 into a back volume in which the acoustic receiver motor is disposed and a front volume that includes sound holes. A linkage interconnects the diaphragm and the movable portion of the armature.

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. A coil bobbin for an acoustic receiver, the coil bobbin comprising:

a coil support member having an armature passageway extending between a first end and a second end of the coil support member;

a first flange extending from the coil support member at the first end of the coil support member;

a second flange extending from the coil support member at the second end of the coil support member, wherein the coil support member is configured to support a coil between the first flange and the second flange;

a shoulder provided on one side of the first flange such that the first flange is located between the shoulder and the coil support member;

a first electrical terminal located at one side of the armature passage, a portion of the first electrical terminal embedded in the shoulder and another portion of the first electrical terminal extending from the shoulder;

a second electrical terminal on the other side of the armature passage, a portion of the second electrical terminal embedded in the shoulder and another portion of the second electrical terminal extending from the shoulder, the second electrical terminal electrically isolated from the first electrical terminal; and

a recess formed on the first flange at a location between the first and second electrical terminals such that a wire of the coil reaches the coil support member from the shoulder.

2. The coil bobbin of claim 1, wherein an end of the first flange proximate to the second electrical terminal comprises a cut-out configured to provide a passage for a wire of the coil.

3. Coil bobbin according to claim 1 or 2, wherein the shoulder comprises a wall extending at an angle relative to the first flange, wherein the wall and the recess provide a passage for a wire of the coil.

4. Coil shaft according to claim 1, characterized in that the coil support part, the first flange, the second flange and the shoulder are formed as a single part.

5. Coil bobbin according to claim 1, wherein parts of the first and second flanges protrude with respect to the shoulder.

6. Coil bobbin according to claim 1, wherein the portions of the first and second electrical terminals embedded in the shoulder have an anchoring configuration.

7. An acoustic receiver motor, comprising:

coil axis according to any of claims 1 to 6;

a coil wound on the coil support part of the coil shaft between the first flange and the second flange, wherein one end of the coil passes through the recess and is electrically connected to the first electric terminal through the shoulder, and the other end of the coil is electrically connected to the second electric terminal;

an armature, a portion of the armature extending through an armature passageway provided by the coil shaft; and

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

8. An acoustic receiver, characterized in that the acoustic receiver comprises:

the acoustic receiver motor of claim 7;

a housing;

a diaphragm disposed within the housing and separating the housing into a back volume and a front volume comprising a sound hole, wherein the acoustic receiver motor is disposed in the back volume; and

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