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Title:
MAGNET ACTUATOR FOR AN ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/158202
Kind Code:
A1
Abstract:
A magnet actuator (1) for use in an electronic device, comprising a housing (2), a first magnet (3), a second magnet (4) attached to the housing (2), a coil (5), and a resilient element (6). The resilient element (6) is arranged to maintain the first magnet (3) and the second magnet (4) in a force equilibrium state by acting as a counterforce to the force caused by the magnetic field, such that the forces caused by the magnets and the resilient element are balanced within the housing and leave any other components of the electronic device unaffected by unexpected variations in force or dimensions.

Inventors:
PESONEN, Mikko (Huawei Technologies Sweden AB, Skalholtsgatan 9, Kista, 16440, SE)
MÄKI, Jouni, Tapio (Huawei Technologies Sweden AB, Skalholtsgatan 9, Kista, 16440, SE)
Application Number:
EP2018/053814
Publication Date:
August 22, 2019
Filing Date:
February 15, 2018
Export Citation:
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Assignee:
HUAWEI TECHNOLOGIES CO., LTD. (Huawei Administration Building Bantian, Longgang DistrictShenzhen, Guangdong 9, 518129, CN)
PESONEN, Mikko (Huawei Technologies Sweden AB, Skalholtsgatan 9, Kista, 16440, SE)
International Classes:
B06B1/04; H02K33/16
Foreign References:
EP1194002A22002-04-03
US20160094115A12016-03-31
US20170216885A12017-08-03
US20080042790A12008-02-21
Other References:
None
Attorney, Agent or Firm:
KREUZ, Georg (Huawei Technologies Duesseldorf GmbH, Riesstr. 8, Munich, 80992, DE)
Download PDF:
Claims:
CLAIMS

1. A magnet actuator (1 ) for use in an electronic device, comprising

a housing (2),

a first magnet (3),

a second magnet (4) attached to the housing (2),

a coil (5), and

a resilient element (6),

the first magnet (3), the second magnet (4), the coil (5), and the resilient element (6) being at least partially located within the housing (2),

the first magnet (3) and the second magnet (4) being arranged so that a magnetic field, generated by the first magnet (3) and the second magnet (4), causes an attractive or repulsive force between the first magnet (3) and the second magnet (4),

the resilient element (6) being arranged to maintain the first magnet (3) and the second magnet (4) in a force equilibrium state by acting as a counterforce to the force caused by the magnetic field,

wherein manipulating the electrical current in the coil (5) causes a change in the attractive or repulsive force thereby causing a displacement between the first magnet (3) and the second magnet (4).

2. The magnet actuator (1 ) according to claim 1 , wherein the first magnet (3) and the second magnet (4) are arranged so that the magnetic field causes a repulsive force between the first magnet (3) and the second magnet (4), and the resilient element (6) is located between the housing (2) and the first magnet (3).

3. The magnet actuator (1 ) according to claim 1 , wherein the first magnet (3) and the second magnet (4) are arranged so that the magnetic field causes an attractive force between the first magnet (3) and the second magnet (4), and the resilient element (6) is located between the first magnet (3) and the second magnet (4).

4. The magnet actuator (1 ) according to any one of the previous claims, wherein the housing (2) comprises an opening (7), and the first magnet (3), or an interposing element (8) attached to the first magnet (3), is adapted to at least partly traverse the opening (7).

5. The magnet actuator (1 ) according to any one of the previous claims, wherein the housing (2) comprises a first housing part (2a) and a second housing part (2b) fixedly connected to the first housing part (2a),

and wherein the second magnet (4) is attached to the second housing part (2b).

6. The magnet actuator (1 ) according to claim 1 , wherein the housing (2) comprises a first housing part (2a) and a second housing part (2b) movably connected to the first housing part (2a), and wherein the first magnet (3) is attached to the first housing part (2a) and the second magnet (4) is attached to the second housing part (2b).

7. The magnet actuator (1 ) according to claim 6, wherein the first housing part (2a) and the second housing part (2b) both have an open end (9) and a closed base (10) connected by a surrounding wall (1 1 ), the first housing part (2a) ending in an inwardly directed flange (12), the second housing part (2b) ending in an outwardly directed flange (13), an outer circumference of the outwardly directed flange (13) substantially corresponding to an outer circumference of the inwardly directed flange (12), and an inner circumference of the outwardly directed flange (13) substantially corresponding to an inner circumference of the inwardly directed flange (12), with allowance for movement between the first housing part (2a) and the second housing part (2b).

8. The magnet actuator (1 ) according to claim 7, wherein the first magnet (3) and the second magnet (4) are arranged so that the magnetic field causes a repulsive force between the first magnet (3) and the second magnet (4), and the resilient element (6) is located between the inwardly directed flange (12) and the outwardly directed flange (13).

9. The magnet actuator (1 ) according to claim 7, wherein the first magnet (3) and the second magnet (4) are arranged so that the magnetic field causes an attractive force between the first magnet (3) and the second magnet (4), and the resilient element (6) is located between the outwardly directed flange (13) and the closed base (10) of the first housing part (2a).

10. The magnet actuator (1 ) according to any one of claims 5 to 9, wherein the first housing part (2a) and the second housing part (2b) are partially overlapping.

1 1 . The magnet actuator (1 ) according to any one of the previous claims, wherein the housing (2) limits the magnetic field to an enclosed space within the housing (2), preventing the magnet actuator (1 ) from interfering with other objects.

12. An electronic device comprising

a movable surface (14), a device chassis (15), and

a magnet actuator (1 ) according to any one of claims 1 to 1 1 arranged between the movable surface (14) and the device chassis (15), and adapted to move the movable surface (14) relative to the device chassis (15).

13. The electronic device according to claim 12, comprising a magnet actuator (1 ) according to any one of claims 1 to 6, 10, and 11 , wherein the movable surface (14) is attached to the first magnet (3) or interposing element (8), and at least a part of the housing (2) is attached to the device chassis (15).

14. The electronic device according to claim 12, comprising a magnet actuator (1 ) according to any one of claims 6 to 1 1 , wherein the movable surface (14) is attached to the first housing part (2a), and the second housing part (2b) is attached to the device chassis.

15. The electronic device according to any one of claims 12 to 14, wherein movement of the movable surface (14) generates vibrations within the electronic device.

Description:
MAGNET ACTUATOR FOR AN ELECTRONIC DEVICE

TECHNICAL FIELD

The disclosure relates to a magnet actuator for use in an electronic device, the magnet actuator comprising a first magnet, a second magnet, a coil, and a resilient element.

BACKGROUND

Electronic devices may be provided with magnet actuators in order to generate, e.g., sound waves. A magnet actuator comprises two magnets which either attract or repulse each other. Initially, the magnets are in force equilibrium, but in order to generate sound waves the attractive or repulsive force between the magnets is changed by means of an electric current, causing the at least one of the magnets to move such that the distance between the magnets decreases or increases.

SUMMARY

It is an object to provide an improved magnet actuator. The foregoing and other objects are achieved by the features of the independent claims. Further implementation forms are apparent from the dependent claims, the description, and the figures.

According to a first aspect, there is provided a magnet actuator for use in an electronic device, comprising a housing, a first magnet, a second magnet attached to the housing, a coil, and a resilient element, the first magnet, the second magnet, the coil, and the resilient element being at least partially located within the housing, the first magnet and the second magnet being arranged so that a magnetic field, generated by the first magnet and the second magnet, causes an attractive or repulsive force between the first magnet and the second magnet, the resilient element being arranged to maintain the first magnet and the second magnet in a force equilibrium state by acting as a counterforce to the force caused by the magnetic field, wherein manipulating the electrical current in the coil causes a change in the attractive or repulsive force thereby causing a displacement between the first magnet and the second magnet. A magnet actuator such as this, wherein the components which are to reach a force equilibrium state are contained within a common housing, facilitates the manufacture of the electronic device in which the magnet actuator is placed. The forces caused by the magnets and the resilient element have been balanced within the housing, such that the other components of the electronic device remain unaffected by, e.g., variations in the force of the resilient element, variations in the force of the magnets, or dimensional variation of the different components of the magnet actuator. Such a solution reduces the number of defective electronic devices and hence manufacturing and repair costs.

In a possible implementation form of the first aspect, the first magnet and the second magnet are arranged so that the magnetic field causes a repulsive force between the first magnet and the second magnet, and the resilient element is located between the housing and the first magnet, allowing the first magnet to move relatively unrestricted within the housing.

In a further possible implementation form of the first aspect,

the first magnet and the second magnet are arranged so that the magnetic field causes an attractive force between the first magnet and the second magnet, and the resilient element is located between the first magnet and the second magnet, allowing the magnet actuator to have an as small width as possible.

In a further possible implementation form of the first aspect,

the housing comprises an opening, and the first magnet, or

an interposing element attached to the first magnet, is adapted to at least partly traverse the opening, such that movement of the first magnet may transfer to the surface to be moved.

In a further possible implementation form of the first aspect,

the housing comprises a first housing part and a second housing part fixedly connected to the first housing part,

and wherein the second magnet is attached to the second housing part, facilitating a very stable magnet actuator which can withstand large external forces. In a further possible implementation form of the first aspect,

the housing comprises a first housing part and a second housing part movably connected to the first housing part, and wherein the first magnet is attached to the first housing part and the second magnet is attached to the second housing part, allowing the magnets to be very securely arranged within the housing.

In a further possible implementation form of the first aspect,

the first housing part and the second housing part both have an open end and a closed base connected by a surrounding wall,

the first housing part ending in an inwardly directed flange,

the second housing part ending in an outwardly directed flange, an outer circumference of the outwardly directed flange substantially corresponding to an outer circumference of the inwardly directed flange, and an inner circumference of the outwardly directed flange substantially corresponding to an inner circumference of the inwardly directed flange, with allowance for movement between the housing parts, allowing the magnet actuator to have an as small height as possible.

In a further possible implementation form of the first aspect,

the first magnet and the second magnet are arranged so that the magnetic field causes a repulsive force between the first magnet and the second magnet, and the resilient element is located between the inwardly directed flange and the outwardly directed flange, securing the intermovable housing parts to each other.

In a further possible implementation form of the first aspect,

the first magnet and the second magnet are arranged so that the magnetic field causes an attractive force between the first magnet and the second magnet, and the resilient element is located between the outwardly directed flange and the closed base of the first housing part, securing the intermovable housing parts to each other while allowing the magnet actuator to have an as small height as possible.

In a further possible implementation form of the first aspect,

the first housing part and the second housing part are partially overlapping, such that the components arranged within the housing parts remain protected from, and unaffected by, the exterior. In a further possible implementation form of the first aspect,

the housing limits the magnetic field to an enclosed space within the housing, preventing the magnet actuator from interfering with other components of the electronic device into which the magnet actuator is fitted.

According to a second aspect, there is provided an electronic device comprising a movable surface, a device chassis, and

a magnet actuator according to the above arranged between the movable surface and the device chassis, and adapted to move the movable surface relative to the device chassis. An electronic device comprising a magnet actuator such as that described above, wherein the components which are to reach a force equilibrium state are contained within a common housing, has a reduced risk of being defective due to variations within the actuator components and hence reduced manufacturing and repair costs.

In a possible implementation form of the second aspect, the movable surface is attached to the first magnet or interposing element, and at least a part of the housing is attached to the device chassis, such that movement of the first magnet may transfer to the movable surface.

In a further possible implementation form of the second aspect, the movable surface is attached to the first housing part, and the second housing part is attached to the device chassis, facilitating a very stable magnet actuator which can withstand large external forces.

In a further possible implementation form of the second aspect, movement of the movable surface generates vibrations within the electronic device, to be used as haptic means or for generating sound waves.

This and other aspects will be apparent from and the embodiment(s) described below. BRIEF DESCRIPTION OF THE DRAWINGS

In the following detailed portion of the present disclosure, the aspects, embodiments, and implementations will be explained in more detail with reference to the example embodiments shown in the drawings, in which:

Fig. 1 shows an exploded view of a magnet actuator in accordance with one embodiment of the present invention;

Fig. 2 shows a cross-sectional side view of a magnet actuator in accordance with one embodiment of the present invention;

Fig. 3 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention;

Fig. 4 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention;

Fig. 5 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention;

Fig. 6 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention;

Fig. 7 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention.

Fig. 8 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention.

Fig. 9 shows a cross-sectional side view of a magnet actuator in accordance with another embodiment of the present invention. DETAILED DESCRIPTION

Conventional magnet actuators are subject to a range of possible defects. After the forces generated by the resilient element and the magnets have been balanced, the final position of the vibration transmitting part of the magnet actuator may be located at a position which is either too high or too low in relation to the stationary part of the magnet actuator, i.e. the part which is attached to, e.g., the chassis of an electronic device. The reason for these deviations may be variation in the force of the resilient element, variation in the force of the magnets, or dimensional variation of the different components of the magnet actuator. This causes the electronic device to be rejected at quality control due to lacking visual quality. Defects may also be the result of the movable part of the electronic device, i.e. the part connected to the vibration transmitting part of the magnet actuator, having insufficient stiffness, such that the forces applied by the magnets and the counterforce applied by the resilient element causes the movable part to bend inwards towards the stationary part. Furthermore, the magnet attached to the movable part of the electronic device may detach from the movable part, with time, due to the constant pulling force acting on the magnet.

The above-mentioned disadvantages are overcome by means of the embodiments of the present disclosure.

Fig. 1 shows an embodiment of the magnet actuator in accordance with the present disclosure. The magnet actuator 1 comprises of a housing 2 formed by a first housing part 2a and a second housing part 2b, a first magnet 3, and a second magnet 4. The second magnet 4 is attached to the housing part 2b by means of, e.g. adhesive. The magnet actuator 1 furthermore comprises a coil 5 which is attached to either the second magnet 4 or the housing 2, in a way such that the coil 5 is located between the first magnet 3 and the second magnet 4. The magnet actuator 1 further comprises a resilient element 6 such as a spring e.g. made of plastic or metal. The resilient element 6 may also be a gasket made of a flexible material, such as silicon or rubber, or of a porous or cellular material, such as microcellular urethane. The resilient element 6 is arranged between the first magnet 3 and the first housing part 2a. The first magnet 3, the second magnet 4, the coil 5, and the resilient element 6 are at least partially located within the housing 2. The magnet actuator 1 is connected to electrical means which transfer electrical current to the coil 5. The first magnet 3 is connected to, or merely arranged in abutment with, a movable surface 14 of an electronic device such as a mobile phone, as shown in Figs. 2 to 7. The second magnet 4 is connected to the closed base 10 of the second housing part 2b, and the second housing part 2b is connected to the chassis 15 of the electronic device, i.e. the second magnet 4 is stationary in relation to the chassis 15 of the electronic device. The first magnet 3 may be connected to an interposing element 8, which in turn is connected to, or arranged in abutment with, the movable surface 14 such that the interposing element

8 is arranged between the first magnet 3 and the movable surface 14.

As shown more clearly in Figs. 2 to 7, the first magnet 3 and the second magnet 4 is arranged so that a magnetic field, generated by the first magnet 3 and the second magnet 4, causes either an attractive or repulsive force between the first magnet 3 and the second magnet 4, depending on how the two magnets have been arranged within the housing 2. The resilient element 6 is arranged to maintain the first magnet 3 and the second magnet 4 in a force equilibrium state by acting as a counterforce to the force caused by the magnetic field. When manipulating the electrical current in the coil 5 a change in the attractive or repulsive force is caused, which in turn causes a displacement between the first magnet 3 and the second magnet 4, i.e. causing the first magnet 3 to move in relation to the second magnet 4. Subsequently, this displacement causes the movable surface 14 of the electronic device to move in relation to the device chassis 15.

The housing 2 may comprise of one part, as shown in Figs. 6 to 9, or two parts 2a, 2b, as shown in Figs. 1 to 5. When comprising of only one part, the housing 2 may comprise of a completely open end 9, a closed base 10 and sidewalls 1 1 connected to the closed base 10, as shown in Fig. 7. Furthermore, the open end 9 of the one-part housing 2 may be somewhat closed, except for the opening 7, as shown in Fig. 6. When comprising two parts 2a, 2b, the housing parts may be arranged such that they are fixedly interconnected and overlapping as shown in Figs. 3 to 5, or completely independent of each other. The two housing parts 2a, 2b may be fixedly, but releasably, interconnected by means of e.g. a snap lock as shown in Fig. 1 , threading, or screws. The two housing parts 2a, 2b may also be fixedly, and permanently, connected by means of e.g. welding or adhesive. The housing parts 2a, 2b may be overlapping but not connected, as shown in Fig. 3.

The housing 2, as well each housing part 2a, 2b, comprises an at least partially open end

9 and a closed base 10 connected by a surrounding wall 1 1 , such that the housing has a substantially tubular shape. When the housing comprises two housing parts 2a, 2b, the two parts are arranged such that the open ends of the two parts 2a, 2b, face each other. The two housing parts may be arranged such that the side walls 1 1 of the two parts 2a, 2b overlap at least partly. As shown in Figs. 2 and 3, the side walls 11 of the second housing part 2b partly cover the side walls 1 1 of the first housing part 2a. As shown in Figs. 4 and 5, the side walls 1 1 of the first housing part 2a partly cover the side walls 1 1 of second housing part 2b. The housing 2/housing parts 2a, 2b may have a circular cross- section, such that it/they form(s) a cylinder having one closed end. The housing 2 may also have any other suitable cross-sectional shape such as e.g. rectangular.

The housing 2/housing parts 2a, 2b limit the magnetic field generated by the first magnet 3 and the second magnet 4 to a space enclosed by the housing 2 or the housing parts 2a, 2b, which prevents the magnet actuator 1 from interfering with other objects such as the components of the electronic device. The housing 2/housing parts 2a, 2b is/are at least partly made of a magnetic material.

Fig. 2 shows an embodiment in which the first magnet 3 and the second magnet 4 are arranged so that the magnetic field causes a repulsive force between the first magnet 3 and the second magnet 4, illustrated by means of arrows. The housing comprises two housing parts 2a, 2b, the second housing part 2b being fixedly connected to the first housing part 2a, and the second magnet 4 being attached to the closed base 10 of the second housing part 2b. The housing may also comprise of only one part, as shown in Fig. 6.

The first magnet 3 is connected to the resilient element 6, which in turn is connected to the partially closed base 10, or the side wall 1 1 , of the first housing part 2a, i.e. the resilient element 6 is located between the first magnet 3 and the first housing part 2a. The partially closed base 10 of the first housing part 2a comprises an opening 7, through which an interposing element 8, attached to the first magnet 3, or at least a part of the first magnet 3, may protrude. The opening 7 is at least partly traversed by at least one of the first magnet or the interposing element 8, such that the magnetic field is limited in all directions. The interposing element 8, or the first magnet 3, is connected to, or arranged directly in abutment with, the movable, vibration transmitting surface 14 of the electronic device. The second magnet 4 is connected to the closed base 10 of the second housing part 2b, which in turn is connected to the device chassis 15. Hence, the movable surface is moved along with the first magnet 3, which generates vibrations within the electronic device, e.g. causing sound waves.

Fig. 3 shows an embodiment in which the first magnet 3 and the second magnet 4 are arranged so that the magnetic field causes an attractive force between the first magnet 3 and the second magnet 4, illustrated by means of arrows. The housing comprises two housing parts 2a, 2b, and the first housing part 2a may be fixedly connected to the second housing part 2b. The housing parts 2a, 2b may also be slidingly interconnected by means of the resilient element 6. The second magnet 4 is attached to the closed base 10 of the second housing part 2b and the resilient element 6 is located between the first magnet 3 and the second magnet 4. The resilient element 6 is connected to the first magnet 3 and to the coil 5 or the second magnet 4. Furthermore, the housing may comprise of only one part as shown in Fig. 7.

The partially closed base 10 of the first housing part 2a comprises an opening 7, through which an interposing element 8, attached to the first magnet 3, or at least a part of the first magnet 3 may protrude. The opening 7 is at least partly traversed by at least one of the first magnet or the interposing element 8, such that the magnetic field is limited in all directions. The interposing element 8, or the first magnet 3, is connected to, or arranged directly in abutment with, the movable, vibration transmitting surface 14 of the electronic device. The second magnet 4 is connected to the closed base 10 of the second housing part 2b, which in turn is connected to the device chassis 15. Hence, the movable surface 14 is moved along with the first magnet 3, which generates vibrations within the electronic device, e.g. causing sound waves.

Fig. 4 shows an embodiment in which the first magnet 3 and the second magnet 4 are arranged so that the magnetic field causes a repulsive force between the first magnet 3 and the second magnet 4. The housing comprises two housing parts 2a, 2b, the first housing part 2a being movably connected to the second housing part 2b, such that the overlapping sidewalls 1 1 of the two housing parts may be slid across each other in the direction of the magnetic forces. The first magnet 3 is attached to the closed base 10 of the first housing part 2a, and the second magnet 4 is attached to the closed base 10 of the second housing part 2b. The first housing part 2a and the second housing part 2b both

have an open end 9 and a closed base 10 connected by a surrounding wall 11. The open end 9 of the first housing part 2a ends in an inwardly directed flange 12, extending substantially parallel with the surface of the closed end 10, and the open end 9 of the second housing part 2b ends in an outwardly directed flange 13, also extending substantially parallel with the surface of the closed end 10 but in a direction which is opposite that of the inwardly directed flange 12. The outer circumference of the outwardly directed flange 13 corresponds substantially to the outer circumference of the inwardly directed flange 12, i.e. when the housing parts 2a, 2b a cylindrical, the outer flange diameter of the second housing part 2b corresponds substantially to the inner sidewall diameter of the first housing part 2a. Similarly, the inner circumference of the outwardly directed flange 13 corresponds substantially to the inner circumference of the inwardly directed flange 12, i.e. when the housing parts 2a, 2b a cylindrical, the inner flange diameter of the first housing part 2a corresponds substantially to the outer sidewall diameter of the second housing part 2b. Hence, the flange 12, 13 of one housing part 2a, 2b extends essentially perpendicular towards the side wall 1 1 of the other housing part 2b, 2a. The flange 12, 13 does not protrude all the way up to the side wall 1 1 , but leaves a small gap such that there is an allowance for movement between the housing parts 2a, 2b.

The resilient element 6 is located between the inwardly directed flange 12 of the first housing part 2a and the outwardly directed flange 13 of the second housing part 2b.

The closed base of the first housing part 2a is connected to, or arranged directly in abutment with, the movable, vibration transmitting surface 14 of the electronic device. Hence, the movable surface 14 is moved along with the first magnet 3, which generates vibrations within the electronic device, e.g. causing sound waves. The second magnet 4 is connected to the closed base 10 of the second housing part 2b, which in turn is connected to the device chassis 15.

Fig. 5 shows an embodiment in which the first magnet 3 and the second magnet 4 are arranged so that the magnetic field causes an attractive force between the first magnet 3 and the second magnet 4. The housing comprises two housing parts 2a, 2b, the first housing part 2a being movably connected to the second housing part 2b, such that the overlapping sidewalls 1 1 of the two housing parts may be slid across each other in the direction of the magnetic forces. The first magnet 3 is attached to the closed base 10 of the first housing part 2a, and the second magnet 4 is attached to the closed base 10 of the second housing part 2b.

The first housing part 2a and the second housing part 2b both

have an open end 9 and a closed base 10 connected by a surrounding wall 11. The open end 9 of the first housing part 2a ends in an inwardly directed flange 12, extending substantially parallel with the surface of the closed end 10, and the open end 9 of the second housing part 2b ends in an outwardly directed flange 13, also extending substantially parallel with the surface of the closed end 10 but in a direction which is opposite that of the inwardly directed flange 12. The outer circumference of the outwardly directed flange 13 corresponds substantially to the outer circumference of the inwardly directed flange 12, i.e. when the housing parts 2a, 2b a cylindrical, the outer flange diameter of the second housing part 2b corresponds substantially to the inner sidewall diameter of the first housing part 2a. Similarly, the inner circumference of the outwardly directed flange 13 corresponds substantially to the inner circumference of the inwardly directed flange 12, i.e. when the housing parts 2a, 2b a cylindrical, the inner flange diameter of the first housing part 2a corresponds substantially to the outer sidewall diameter of the second housing part 2b. Hence, the flange 12, 13 of one housing part 2a, 2b extends essentially perpendicular towards the side wall 1 1 of the other housing part 2b, 2a. The flange 12, 13 does not protrude all the way up to the side wall 1 1 , but leaves a small gap such that there is an allowance for movement between the housing parts 2a, 2b.

The resilient element 6 is located between the outwardly directed flange 13 of the second housing part 2b and the closed base 10 of the first housing part 2a.

The closed base of the first housing part 2a is connected to, or arranged directly in abutment with, the movable, vibration transmitting surface 14 of the electronic device. Hence, the movable surface 14 is moved along with the first magnet 3, which generates vibrations within the electronic device, e.g. causing sound waves. The second magnet 4 is connected to the closed base 10 of the second housing part 2b, which in turn is connected to the device chassis 15.

The present disclosure further relates to an electronic device comprising a movable surface 14, a device chassis 15, and a magnet actuator 1 . The magnet actuator may be arranged between the movable surface 14 and the device chassis 15, and adapted to move the movable surface 14 relative to the device chassis 15. Movement of the movable surface 14 generates vibrations within the electronic device, which are used as a haptic means or for generating wound waves.

The movable surface 14 may be attached to the first magnet 3 or the interposing element 8, and at least a part of the housing 2 may be fixed to the device chassis 15.

Furthermore, the movable surface 14 may be attached to the first housing part 2a, and the second housing part 2b is attached to the device chassis.

Figs. 8 and 9 show embodiments in which the first magnet 3 and the second magnet 4 are arranged so that the magnetic field causes an attractive force between the first magnet 3 and the second magnet 4, illustrated by means of arrows. The housing 2 comprises a surrounding wall 11 and two open ends 9. A crossbar 17 extends across the interior space formed by the surrounding wall 1 1 , such that the ends of the housing has a substantially open, tubular shape while being substantially closed off across its the center. The crossbar 17 extends in parallel, and in between, the first magnet 3 and the second magnet 4. The magnetic field generated by the first magnet 3 and the second magnet 4 remains uninterrupted by the crossbar 17 due to an opening 7 in the crossbar, as shown in Fig. 9, or due to the crossbar 17 being at least partially made of a non-magnetic material.

The various aspects and implementations has been described in conjunction with various embodiments herein. However, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed subject-matter, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word“comprising” does not exclude other elements or steps, and the indefinite article“a” or“an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

The reference signs used in the claims shall not be construed as limiting the scope.