RU153983U1 - LOUDSPEAKER WITH FRONTLY FIXED MAGNET - Google Patents

Abstract

1. A loudspeaker (200), comprising: a support frame, a magnetic assembly (1) forming an air gap (T) attached to said support frame, a voice coil (2) located on the cylinder (20) with axial movement in the air gap (T) of the magnetic unit (1), - a membrane (203) connected to the supporting frame and to the cylinder (20) of the coil (2) with the possibility of vibration and sound generation, and - elastic suspensions (6, 7) connecting a cylinder (20) of the coil and a membrane with a supporting frame, said membrane (203) having a central hole (235) forming a central edge (230) directly attached to the voice coil cylinder (20), a peripheral section (236) connected to the frame, and a conical section (233) between the central edge (230) and the peripheral section (236) ) membranes, said magnetic unit (1) is axially at the height of the peripheral portion (236) of the membrane, characterized in that said membrane (203) contains a flat central section (231) located between the central edge (230) and the conical section (233) wherein said flat central teaching the drain (231) of the membrane radially extends outward from the cylinder (20) of the voice coil along a plane perpendicular to the axis of the cylinder (20) of the voice coil, the speaker also includes a reinforcing plate (208) containing a peripheral flange (281; 581) attached to the flat central portion (231) of the membrane, wherein said reinforcing plate (208) is not attached to the cylinder (20) of the coil. 2. The loudspeaker according to claim 1, wherein said reinforcing plate (208) comprises a central portion (280) that closes the hole formed by the trailing edge

Description

LOUDSPEAKER WITH FRONTLY FIXED MAGNET

Technical field

This utility model patent application relates to a loudspeaker with a front-mounted magnet. State of the art

The loudspeaker comprises a magnetic assembly forming an air gap and a voice coil, which moves in said air gap. The membrane is connected to said voice coil in such a way as to vibrate and generate sound.

The loudspeaker comprises a rear side, which consists of a basket used to support the loudspeaker, and a front side used to emit sound generated as a result of vibration of the membrane.

In conventional speakers, the membrane is usually located at the front of the speaker, and the magnet assembly is located behind the membrane.

Such conventional speakers have a very large volume in the axial direction, which is created by the volume of both the membrane and the magnetic assembly.

Known speakers with a frontally mounted magnet, designed to reduce the mentioned volume. It should be noted that the membrane usually has the shape of a truncated cone with a concavity facing the front of the loudspeaker. Therefore, the magnetic assembly is fixed in front of the speaker using the concavity of the membrane without any additional volume (see, for example, WO 2004/017674).

In FIG. 1 shows a loudspeaker with a frontally mounted magnet, in accordance with the prior art, indicated generally by the reference numeral (100).

Loudspeaker (100) contains:

- supporting frame (4, 5),

- a magnetic assembly (1) forming an air gap (T) attached to the supporting frame,

- a voice coil (2) located on the cylinder (20) with the possibility of axial movement in the air gap (T) of the magnetic node (1),

- a membrane (3) connected to said supporting frame and to said cylinder (20) of coil (2) with the possibility of vibration and sound generation, and

- elastic suspensions (6, 7) connecting the cylinder of the coil and the said membrane with the supporting frame.

The membrane (3) has the shape of a truncated cone and contains a central hole that forms a central cylindrical edge (30), which is directly attached to the cylinder (20) of the voice coil so that the cylinder of the voice coil is axially relative to the membrane (3) having the shape of a truncated cone.

Said support frame comprises a rear basket (4) and a front basket (5), which are mutually connected.

The magnetic assembly (1) is held by the front basket (5) so as to be located in front of the membrane (3) in the axial direction relative to the membrane (3) having the shape of a truncated cone.

The magnetic assembly (1) contains a toroidal magnet (10) located between the pole plate (11) with a toroidal shape and the magnetic pole (12) with a T-shaped section, which is commonly known as the "T-yoke".

The magnetic pole (12) is attached to the front basket (5) and contains a gap (I) in which the coil (2) moves.

Said pendants comprise a first clamp (6) and a second clamp (7).

The first clamping collar (6) is in the form of a wave-like disk with a central hole and comprises a central cylindrical section (60), which is directly attached to the cylinder (20) of the voice coil, and a peripheral section (61), attached to the rear basket (4).

The second clamping clamp (7) is made in the form of a wave-like ring and contains a central portion (70), which is attached to the peripheral portion (36) of the membrane, and a peripheral portion (71), mounted between the rear basket (4) and the front basket (5).

To prevent dust from entering the aforementioned air gap, a dust cover (8) is fixed to the rear edge of the cylinder (20) of the voice coil.

Moreover, the loudspeaker (100) of the prior art occupies a large space due to the membrane (3) having the shape of a truncated cone. In addition, the loudspeaker (100) 'has disadvantages due to the presence of a cover (8), which is directly attached to the cylinder (20) of the voice coil.

In essence, the Applicant has found that having such a cover (8) directly attached to the voice coil cylinder (20) increases the resonance frequency of the speaker, thereby degrading the low-frequency characteristics of the speaker.

Another disadvantage of the loudspeaker (100) is associated with the attachment of the Central section (60) of the first clamping clamp (6) directly to the cylinder (20) of the voice coil. Such fastening is essentially complex and unreliable.

Other types of loudspeakers with a frontally fixed magnet are known, in which the membrane is not directly connected to the voice coil, but connected to a connecting element attached to the cylinder of the voice coil. Such a connecting element works in exactly the same way as the dust cover (8) shown in FIG. 1, and has the aforementioned disadvantages.

Utility Model Summary

The objective of this utility model is to eliminate the disadvantages of the prior art by creating a loudspeaker with a frontally mounted magnet having a minimum axial volume and high low-frequency characteristics.

Another objective of this utility model is to eliminate the disadvantages of the prior art by creating a loudspeaker with a frontally mounted magnet, which is reliable and easy to manufacture.

These tasks are solved according to the utility model with the features set forth in the attached independent paragraph 1 of the utility model formula.

Preferred embodiments are apparent from the dependent claims of the utility model.

The loudspeaker of the present utility model differs from the loudspeaker of the prior art in that the membrane comprises a flat central portion that projects radially outward from the cylinder of the voice coil along a plane perpendicular to the axis of the cylinder of the voice coil.

The presence of such a flat central portion reduced the axial dimension of the speaker. However, the aforementioned flat portion of the membrane was not sufficiently rigid.

Therefore, a reinforcing plate was invented that contains a peripheral flange attached to said central portion of the membrane so as to effectively transmit the axial movement of the cylinder of the coil of the truncated conical portion of the membrane.

It is important that said reinforcing plate is not attached to the coil of the coil in order to reduce the critical frequency of the speaker and improve low-frequency characteristics.

Brief Description of the Drawings

Additional characteristics of the utility model will be apparent from the following detailed description with reference to the accompanying drawings, which have only an explanatory but not limiting purpose, on which:

FIG. 1 is a longitudinal section through a loudspeaker with a frontally mounted magnet in accordance with the prior art;

FIG. 2 is an exploded view of a front-mounted loudspeaker magnet in accordance with the present utility model;

FIG. 3 is a longitudinal section through the loudspeaker shown in FIG. 2, in assembled condition;

FIG. 4 is a longitudinal section of the speakers shown in FIG. 1 and 3, allowing to compare their axial size;

FIG. 5 is a longitudinal section through a first embodiment of a loudspeaker, in accordance with the present utility model;

FIG. 5A is an enlarged view of a part enclosed in rectangle A shown in FIG. 5;

FIG. 6 is a longitudinal section through a second embodiment of a loudspeaker, in accordance with the present invention; and

FIG. 6A is an enlarged view of a part enclosed in rectangle A shown in FIG. 6.

Hereinafter, elements that are identical or correspond to the elements described above are denoted by the same reference numerals, while their detailed description is not given.

Description of Preferred Embodiments

In FIG. 2 and 3, a loudspeaker is shown in accordance with a utility model, which is generally indicated by the reference numeral (200).

Loudspeaker (200) contains:

- supporting frame (4, 5),

- a magnetic assembly (1) forming an air gap (T) attached to said supporting frame,

- a voice coil (2) located on the cylinder (20) with the possibility of axial movement in the air gap (T) of the magnetic assembly (1);

- a membrane (203) connected to the said supporting frame and to the cylinder (20) of the coil (2) with the possibility of vibration and sound generation,

- elastic suspensions (6, 7) connecting the cylinder (20) of the coil and the membrane (203) with said supporting frame.

The magnetic assembly (1) contains a permanent magnet (10), which in this example has a toroidal shape located between the pole plate (11) with a toroidal shape and a magnetic pole (12) made of mild steel and having a T-section, which is usually known as the T-yoke. The mentioned parts may have a different shape, provided that they include a permanent magnet and parts made of mild steel, adapted to form an air gap in which the voice coil moves.

Membrane (203) contains:

- the Central hole (235) (Fig. 2), which forms the Central edge (230), directly attached to the cylinder (20) of the voice coil,

- a peripheral section (236) connected to said frame (4, 5), and

- a conical section (233) between the central edge (230) and the peripheral section (236) of the membrane.

The membrane (203) also contains a flat central ring-shaped portion (231) located between the central edge (230) and the conical section (233).

When the central edge (230) of the membrane is attached to the voice coil cylinder (20), the central portion (231) of the membrane radially extends from the voice coil cylinder and extends along a plane perpendicular to the axis of the voice coil cylinder.

The presence of a flat central portion (231) of the membrane reduces the axial size of the membrane (203) compared with the membrane (3) shown in FIG. 1, while maintaining the same acoustic characteristics. The cylinder (20) of the voice coil is located in the axial direction relative to the conical portion (233) of the membrane.

However, when the coil cylinder moves, the central portion (231) of the membrane tends to deform and lose its rigidity, since the central portion (231) of the membrane is directly attached to the coil of the coil.

In order to eliminate this drawback, a reinforcing plate (208) was invented in accordance with this utility model. The reinforcing plate (208) comprises a central portion (280) and a peripheral flange (281) that is attached to the central portion (231) of the membrane, thereby keeping the central portion (231) of the membrane in a flat position all the time.

It is important to note that the reinforcing plate (208) is not attached to the cylinder (20) of the voice coil and is not in contact with the cylinder (20). Based on the foregoing, the reinforcing plate (208) acts as an additional mass, reducing the resonance frequency of the speaker and improving low-frequency characteristics.

Although the central portion (280) of the reinforcing plate does not contact the rear edge of the voice coil cylinder (20), said central portion covers the cylinder bore (20) and prevents dust and foreign particles from entering the air gap (T).

Said frame comprises a rear basket (4) and a front basket (5), which are mutually connected.

The front basket (5) comprises a central portion (50) on which the pole plate (11) is fixed so that the magnet assembly (1) is substantially at the same level as the peripheral portion (236) of the membrane, i.e. the magnetic assembly (1) is located in front of the membrane and in an axial position relative to the membrane having the shape of a truncated cone.

The first clamping collar (6) has the shape of a wave-like disk with a central hole (65) and contains a central section (60), which is fixed between the peripheral flange (281) of the reinforcing plate and the flat central section (231) of the membrane. Based on the foregoing, the central portion (60) of the first clamping collar does not come into contact with the voice coil cylinder (20). Thus, this solution eliminates the problems associated with the difficult unreliable attachment of the clamping clamp to the cylinder of the voice coil.

The second clamping clamp (7) has the shape of a wave-like ring. The second clamping clamp (7) contains:

a central portion (70) that is attached to a peripheral portion (236) of the membrane, and

- a peripheral section (71) fixed between the rear basket (4) and the front basket (5).

It should be noted that the reinforcing plate (208) performs four functions:

1) gives rigidity to the planar central portion (231) of the membrane in order to ensure optimal transmission of the axial displacement of the cylinder (20) of the movable coil to the inclined portion of the truncated cone membrane,

2) acts as an additional mass, which reduces the resonance frequency of the speaker and improves low-frequency characteristics,

3) provides accurate fixation of the Central section (60) of the first clamping clamp, which is clamped in a three-layer configuration between the flat central section (231) of the membrane and the reinforcing plate (208),

4) closes the cylinder (20) of the movable coil, preventing foreign particles from entering the air gap (T).

Referring to FIG. 4, the presence of a membrane (203) with a flat central portion (231) and a reinforcing plate (208) makes it possible to obtain a flatter speaker (200) and use a shorter cylinder (20) of the voice coil compared to the loudspeaker (100) of the prior art.

As shown in FIG. 4, the speaker (100) in accordance with the prior art has an axial dimension (h1), and the speaker (200) has an axial dimension (h2), while reducing the height (s) is approximately 15% of the height (h1) of the speaker in accordance with prior art.

As shown in FIG. 5 and 5A, in accordance with the first embodiment of the utility model, the loudspeaker (200) comprises a second reinforcing element (300) made in the form of an annular plate and located above the flat portion (231) of the membrane.

As shown in FIG. 6 and 6A, in accordance with a second embodiment of the utility model, the reinforcing plate (208) contains only an annular plate (581) located above the flat portion (231) of the membrane. In this case, the cover (8) is applied to the lower edge of the cylinder (2) of the coil.

It should be noted that the loudspeaker of the present utility model is preferably installed in the frame provided in the vehicle, for example, under the seat, door or dashboard of the vehicle.

Given that said vehicle frames have a limited length, typically less than 100 mm, the loudspeaker should have an axial dimension of less than 100 mm, preferably 85 mm.

Changes and modifications can be made in these embodiments of the utility model, within the competence of a person skilled in the art, without departing from the scope of the present utility model.

Claims (8)

1. A loudspeaker (200), comprising: - supporting frame - a magnetic assembly (1) forming an air gap (T) attached to said supporting frame, - a voice coil (2) located on the cylinder (20) with the possibility of axial movement in the air gap (T) of the magnetic node (1), - a membrane (203) connected to the supporting frame and to the cylinder (20) of the coil (2) with the possibility of vibration and sound generation, and - elastic suspensions (6, 7) connecting the cylinder (20) of the coil and the membrane with the supporting frame, said membrane (203) comprising a central opening (235) defining a central edge (230) directly attached to the voice coil cylinder (20), a peripheral portion (236) connected to said frame, and a conical section (233) between the central edge (230) and the peripheral portion (236) of the membrane, and the said magnetic node (1) is located axially at the height of the peripheral portion (236) of the membrane, characterized in that said membrane (203) comprises a flat central portion (231) located between the central edge (230) and a conical portion (233), said flat central central portion (231) of the membrane radially protruding outward from the voice coil cylinder (20) along a plane perpendicular to the axis of the cylinder (20) of the voice coil, and the loudspeaker also includes a reinforcing plate (208) containing a peripheral flange (281; 581) attached to the flat central portion (231) of the membrane, said reinforcing plate (208) not being attached to the cylinder (20) of the coil. 2. The loudspeaker according to claim 1, wherein said reinforcing plate (208) comprises a central portion (280) that covers the hole formed by the rear edge of the cylinder (20) of the movable coil to prevent foreign particles from entering the air gap (T), wherein said central portion (280) is not in contact with the cylinder of the movable coil and a peripheral flange (281) attached to the flat central portion (231) of the membrane. 3. The loudspeaker according to claim 2, wherein said elastic suspensions (6, 7) comprise a first clamping collar (6) made in the form of a wave-like disk with a central hole (65) and a central portion (60) fixed in a layered configuration between said a peripheral flange (281) of the reinforcing plate and said flat central membrane portion (231). 4. The loudspeaker according to claim 1, wherein said elastic suspensions (6, 7) comprise a second ring clamp (7) containing a central portion (70) attached to a peripheral portion (236) of said membrane, and - a peripheral portion (71) attached to said rear basket (4) and front basket (5). 5. The loudspeaker according to claim 1, wherein said frame comprises a rear basket (4) and a front basket (5) that are connected together and form a supporting frame, said front basket (5) comprising a central portion (50) supporting said magnetic node (1). 6. The loudspeaker according to claim 5, wherein said magnetic assembly (1) comprises a toroidal magnet (10) located between a pole plate (11) with a toroidal shape and a magnetic pole (12) with a T-shaped section, said pole plate ( 11) with a toroidal shape attached to said central portion (50) of said front basket. 7. The loudspeaker assembly and the housing, comprising a loudspeaker (200) according to claim 1 and a vehicle housing that accommodates the loudspeaker. 8. The loudspeaker and housing assembly according to claim 7, characterized in that said housing is a housing under the vehicle seat.

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