CN113497991A

CN113497991A - Head earphone

Info

Publication number: CN113497991A
Application number: CN202110290441.XA
Authority: CN
Inventors: 托马斯·伯格曼恩
Original assignee: Sennheiser Electronic GmbH and Co KG
Current assignee: Sonova Consumer Hearing GmbH
Priority date: 2020-03-19
Filing date: 2021-03-18
Publication date: 2021-10-12
Also published as: DE102020107593A1

Abstract

The present invention relates to a headphone. A mechanical device that maintains the stationary state of a movable component relative to another component up to a defined limit is referred to as a braking mechanism. In a device having two parts which are movable relative to one another, which can be moved relative to one another in a predetermined direction, a magnetic braking mechanism is provided which is formed by two multipolar magnetized magnetic films. Each multipole-magnetized magnetic film is fastened to one of two parts that are movable relative to each other. When two parts that are movable relative to each other are moved relative to each other in a predetermined direction, the two multi-pole magnetized magnets move at a small distance along each other. In this case, the magnetic forces acting between the parts influence the force required for the movement and define a preferred position or latching position in which the opposing poles are opposite. The magnetic detent mechanism may be used for an adjustable bow of the headset.

Description

Head earphone

Technical Field

The invention relates to a device having a movable part and a braking mechanism (Gehem), in particular a magnetic braking mechanism.

Background

In many different devices, for example in the bow of an adjustable headset, but also in closures or slide switches, the parts can be moved or mechanically adjusted relative to one another. In this case, the defined movement position set by the user should generally be maintained as far as possible, while the force used by the user for the movement should at the same time be as low as possible. In this case, a mechanical device called a locking mechanism or a braking mechanism is generally used. The locking mechanism can hold the movable component in principle completely or up to a defined limit in relation to the rest state of the other component by means of the locking element. In the latter case, the brake mechanism is said. For example, a brake that generally operates according to the principles shown in FIG. 1 may be used as the locking mechanism or the braking mechanism. The part 120 can be moved, for example, slidingly along the other part 110, but a certain preferred position is provided therein. The distance between the two parts can be fixed, for example by a guide (not shown in fig. 1). The force for moving the

parts

110, 120 relative to each other is greater in the preferred position or detent position than in the other position, fig. 1a), as in fig. 1 b). Nevertheless, movement is possible. The preferred or latched position is generally defined by a detent 130, here a ball, which is pressed into a suitable recess 115 by a spring 140. The spring 140 may also have another shape, for example a curved member may be used, which may also comprise a detent. Different recesses 115 represent different latching positions.

Such mechanical locking or braking mechanisms have various disadvantages, such as a large number of generally small components, which can be difficult to install. Thus, installation is typically relatively expensive. Furthermore, the spring 140 (especially when, for example, curved elements are involved) and the shape of the recess 115 may wear out with use.

Disclosure of Invention

It is an object of the present invention to provide an improved low wear brake mechanism.

Furthermore, flexible magnetic films are known, which are generally advantageously obtained as fabrics. The flexible magnetic film is made of a flexible carrier material, for example plastic, which has embedded magnetic elements, which are usually oriented in such a way that the magnetic film is permanent and is magnetized only on one side. As shown in fig. 2, magnetic north poles N and magnetic south poles S are alternately on one side 220 of film 210, while no poles are present on back side 230. Correspondingly, a magnetic field 250 and thus a magnetic force occur only on the pole side 220 of the membrane. The backside 230 may be, for example, coated, painted, or bonded to a substrate. As shown in the perspective view in fig. 3, the magnetic poles in the magnetic film extend in generally straight parallel rows in either the longitudinal direction of the film or the transverse direction of the film. In this case, different parameters are optional, such as the spacing a of the poles from one another, the magnetic force depending on the material and thickness D of the membrane, etc. For example, the thicker the membrane, the higher the magnetic force of the membrane. Typical values for the thickness D are, for example, 0.5 to 2 mm. Furthermore, the film can generally be cut simply by means of scissors into pieces having the desired width B and length L.

The above mentioned objects are achieved by a device according to an embodiment. In this case, magnets are used which are opposite one another and are each fastened to parts which are movable relative to one another in order to define a preferred position or a latching position. For this purpose, magnetic films lying opposite one another are particularly well suited, since they have a relatively low mass and a plurality of poles, are easily cut to the desired dimensions, and are fastened simply and permanently by gluing. According to the invention, the multipole magnet is located on two parts which are opposite and movable relative to each other, whereby a preferred position or a latching position is obtained by the different poles being opposite. In some cases it may be sufficient to provide a multi-stage magnet at only one of the parts, while only one pole of the magnet is present on the opposite side (where the other pole of the magnet is shown in the other direction).

Other advantageous embodiments are described below.

Drawings

Further details and advantageous embodiments are shown in the figures. Shown in the drawings are:

FIG. 1 illustrates a known locking or braking mechanism having a spring;

FIG. 2 shows a known single-sided magnetized film;

FIG. 3 shows a perspective view of a single-sided magnetized film;

FIG. 4 illustrates a bearing having a braking mechanism according to the present invention;

FIG. 5 shows a different preferred or detent position;

fig. 6 shows a headset with an adjustable bow;

fig. 7 shows a detent mechanism according to the invention in a headset bow, an

Fig. 8 shows an embodiment with a circular braking mechanism.

Detailed Description

Fig. 4 shows a bearing 400 having a locking or braking mechanism according to the present invention. The two

parts

410, 420 are arranged in a plain bearing, a rolling bearing or another bearing, so that they can be moved relative to one another. The direction of movement and the spacing between the

parts

410, 420 may be limited or predetermined by guides (not shown). In the example, the upper component 410 can move laterally (right/left) relative to the lower component 420. Each of the two

parts

410, 420 has a

magnetic film

430, 440, for example, bonded thereto, which is magnetized in a single-sided, multi-pole manner. The lines of the same pole of the magnetic film (corresponding to the width B in fig. 3) run transversely to the direction of movement, i.e. perpendicular to the drawing plane here. In this case, in the preferred position or the latching position, the different poles are opposite and mutually attracted. In fig. 4a), the movable part 410 is at a left stop, which is defined by mechanical limitations, as here for example by the

projections

415, 425, and can thus only be moved to the right.

In fig. 4b), the movable part 410 has moved to the right, where the pole of the upper magnetic film 430 first approaches the same pole (not shown) of the opposite lower magnetic film 440. Here, a magnetic repulsive force is generated between the upper magnetic film and the lower magnetic film. In order to overcome the attractive forces of the different poles opposite one another first and then to overcome the increased repulsive forces of the adjacent poles of the same name during the movement, a higher force is first used until the poles of the same name are opposite one another. This position is unstable, so that the further movement of the movable part 410 can be carried out with little effort until it assumes the next stable preferred position or latching position, in which the different poles are again opposite. If the friction of the bearing is sufficiently small, the movable member 410 has been pulled into the next stable preferred position or latching position by magnetic force. Said position is shown in fig. 4 b). The arrangement of the

magnets

430, 440 is hereinafter referred to as a braking mechanism, since the movement is braked first.

Any other movement to the right or left works according to the same principle. In fig. 4c), the movable part 410 is in the preferred or latched position at the right stop, which is defined here by the

projections

415, 425, and can thus only be moved to the left. However, the stop is in principle optional and not necessary for the function of the brake mechanism. It is also immaterial whether only one or both

parts

410, 420 of the bearing 400 are movable, since the

parts

410, 420 only have to be movable relative to each other.

Fig. 5a) shows four different stable preferred or

detent positions

531 and 534 that the multi-pole magnet 430 of the movable part 410 of the bearing 400 can occupy relative to the multi-pole magnet 440 of the fixed part 420 of the bearing. Other positions are unstable, but where the

parts

410, 420 may be pulled into a stable position by magnetic force.

In the example, the number of opposing poles is always the same. Alternatively, the number may be variable, for example by the way in which the poles of the movable part 410 can be moved out of the force field of the poles of the fixed part 420. In this way, particularly preferred positions can be defined, for example, within the preferred positions, as shown in fig. 5 b). The multipole magnets of the two parts can be completely, partially (more or less) opposed or not opposed at all, and thus the bearing can assume, for example, a first preferred position (left view), a second preferred position (middle view) or a third preferred position (right view). The third preferred position is more strongly preferred than the second preferred position, and the second preferred position is in turn more strongly preferred than the first preferred position, since the number of opposite magnetic poles is respectively greater. Correspondingly, more force is required in order to overcome the braking mechanism and move away from the position. Additionally, the bearing may optionally occupy other positions in which the poles are not opposed and thus not the preferred position (not shown). The frictional resistance of the bearing may be measured such that in said case said frictional resistance prevents the bearing from being pulled into one of the preferred positions by the magnetic force itself.

The invention may be used in a number of different devices or applications, for example for improved headphone bows.

In one embodiment, fig. 6 shows a headset 600 with adjustable bows. The two

ear cups

620, 630 have, as usual, cushions 621, 631, sound transducers, etc., and are each connected to the overhead bow 610 via a slide bearing. The

rails

640, 650 which are fastened to the ear cups and which are movable relative to the bow 610 each belong to a slide bearing. Thereby, the headset may be individually adjusted for different head sizes or ear positions. The detent mechanism is between the

movable rails

640, 650 and a counterpart in the interior of the bow 610. Here, conventionally, the brake is usually involved, however according to the invention, a magnetic braking mechanism is used as described above, as is exemplarily shown for one side of the headset in fig. 7.

The track 640 fastened to the ear cup 620 optionally moves in guides (not shown) along a mating track 660 in the interior of the bow 610. The braking mechanism is shown here in a simplified (and not to scale) by means of two multipole magnetic films of the same length, but can also be constructed, as in fig. 4, by means of multipole magnetic films of different lengths. As shown in detail in fig. 7, a first multi-pole magnetic film 670 is fastened, e.g., adhered, to the rail 640, and a second multi-pole magnetic film 680 is oppositely fastened, e.g., adhered, to the mating rail 660 of the bow 610. The

tracks

640, 660 may be moved relative to each other by means of a preferred or latched position defined by the

magnetic films

670, 680.

In this case, for example, the clamp 695 can optionally prevent the magnetic filmIs offset laterally. In some cases, this may already be sufficient to guide the track or at least support the guiding. In some applications (headphones or other devices with movable parts), i.e. when the opposing magnetic films are in contact and the tracks are held together (only) due to magnetic forces, the braking mechanism may at the same time act as a bearing or fastener for the tracks movable relative to each other. Furthermore, a thin sliding film 690 or an oil or grease film may optionally be present between the

magnetic films

670, 680 in order to reduce wear at the magnets when in direct contact. The stronger the

magnetic films

670, 680 and the smaller the spacing between them, the more powerful the braking mechanism will act. For example, the spacing between the

magnetic films

670, 680 should not be greater than the thickness of the magnetic films, but preferably significantly less (e.g., 0.1% -5%, 5% -10%, 10% -20% of the thickness, as the application dictates) until direct contact (0%). Furthermore, the number of opposite poles has an effect on the action of the braking mechanism; the more opposite poles or the larger the surface of the magnetic film, the more intense the action (with the same material and spacing of the magnets). Thus, the attractive or repulsive magnetic force may be in g/cm²Is a unit description.

Alternatively, other embodiments of the brake mechanism for a headset according to the invention are also possible. For example, the

tracks

640, 650 may be omitted and the mating track 660 with the second multipole magnetic film 680 may be movable through the ear cups 620, 630. The first multi-polar magnetic film 670 may then be in the interior of the earmuff to constitute, together with the second multi-polar magnetic film 680, a braking mechanism according to the invention.

In addition to the previously described forms of linear braking mechanism, other forms are also possible. It is particularly advantageous here if the magnetic film is flexible. Fig. 8 shows a circular brake mechanism 800 according to the invention, in which a circular first part 810 can be rotated about a centre point 830. Here, for example, a multi-stage magnetic film externally disposed on the first component 810 moves along another multi-stage magnetic film fastened on the fixed second component 820. In other embodiments, the annular first member 810 is fixed and the second member 820 is rotatable about the center point 830. In other embodiments 800', the annular first part 810' forms a ring with a magnetic film on the inside, with the second part 820' in the interior of the ring. As mentioned above, in each case a preferred position or latching position is defined for the rotation by the opposite magnetic poles. It is likewise possible to prevent and thus exclude certain positions, namely the above-mentioned unstable positions, in which the poles of the same name lie opposite one another.

In general, the invention relates to a device having two parts movable relative to each other, said two parts being movable relative to each other in a predetermined direction, wherein the device comprises the following: a first multi-polar magnetized magnet secured to a first of the two components movable relative to each other; and a second multi-pole magnetized magnet secured to a second of the two components movable relative to each other. When the two movable parts are moved relative to each other in a predetermined direction, the first multipole-magnetized magnet is moved along the second multipole-magnetized magnet, to be precise at a distance that is so small that a magnetic force is present between the first and second multipole-magnetized magnets that influences the force required for the movement of the two movable parts relative to each other. In particular, the magnetic force between the components defines a preferred position or latching position in which the opposite poles are opposed.

One advantage of the present invention is that a cost-effective available single-sided multi-polar magnetized magnetic film can be used. It should be noted that such magnetic films, although obtainable with different spacings between the poles, for example 1.5-4.5mm spacings, must have the same spacing between the poles in the bearing between the opposing magnetic films. The spacing a between the poles determines the spacing between the different preferred or detent positions. The spacing is twice the spacing a between the poles, i.e. for example 3-9 mm.

Another advantage is that the number of components required is very small and the installation is very simple and in many cases requires little adjustment. Furthermore, the brake mechanism according to the invention operates completely without wear.

Embodiments comprise only one-dimensional bearings which can be moved, for example, in the left/right direction, however, depending on the arrangement of the magnets and possible guides, the braking mechanism according to the invention can in principle also be moved relative to one another in two or three dimensions.

The different embodiments of the described embodiments can also be combined with one another as far as meaningful and feasible. Variations independent of the brake mechanism are also possible, for example, the headset 600 shown with a cord in fig. 6 may also be wireless, have a retractable arm and/or only one ear cup.

Claims

1. A headset (600) having at least one ear cup (620, 630) and an adjustable bow (610; 640) comprising two parts (410, 420; 640, 660) that are movable relative to one another, the parts (410, 420; 640, 660) that are movable relative to one another being movable relative to one another in a predetermined direction and being guided by a guide there, wherein

-on a first (410; 640) of the two parts movable with respect to each other there is fastened a magnet (430; 670) of a first multipole magnetization; and

-fastening a second multipolar magnetized magnet (440; 680) on a second part (420; 660) of the two parts movable with respect to each other;

-wherein the first multipole magnetized magnet (430; 670) moves along the second multipole magnetized magnet (440; 680) when the two parts (410, 420; 640, 660) movable relative to each other move relative to each other in the preset direction;

each of the multi-pole magnetized magnets has a plurality of poles that alternate in a direction of motion; and

at least one of the multi-pole magnetized magnets (430, 440; 670, 680) comprises a flexible magnetic film;

wherein at least two different preferred positions or latching positions (531) are defined by the magnetic forces occurring between the magnets of the first and second multipole magnetization, which the two parts movable relative to each other can assume, wherein in each preferred position or latching position the opposite poles of the first and second magnets are opposite.

2. Headphones according to claim 1, wherein the flexible magnetic film is single-sided magnetised and adhered or welded at the first or second part (410, 420; 640, 650) by means of a non-magnetic side.

3. A headset according to claim 1 or 2, wherein two multipole magnetized magnets (430, 440; 670, 680) comprise flexible magnetic films, and wherein there is a spacing between the flexible magnetic films corresponding to 0.1-10% of the thickness of the flexible magnetic films.

4. A headset according to any of claims 1-3, wherein the spacing (a) between the poles of the first multi-pole magnetized magnet (430; 670) is the same as the spacing (a) between the poles of the second multi-pole magnetized magnet (440; 680).

5. A headset according to any of claims 1-4 wherein the first multi-pole magnetized magnet (430; 670) is shorter or narrower than the second multi-pole magnetized magnet (440; 680) and has fewer poles than the second multi-pole magnetized magnet.

6. A headphone according to any one of claims 1 to 4 wherein the two multi-pole magnetised magnets have the same number of poles and substantially the same width and/or length.

7. Headphones according to any one of claims 1 to 6, wherein the track (660) in the bow and the track (640) fastened to the ear cup (620) form two of the parts that are movable relative to one another, on which parts the multipole-magnetized magnets (670, 680) are fastened, respectively.

8. A headphone as claimed in any one of claims 1 to 7 wherein the length of the bow is changeable by movement of the two parts that are movable relative to each other.