CN114503051A

CN114503051A - Foldable assembly for electronic device

Info

Publication number: CN114503051A
Application number: CN201980101056.7A
Authority: CN
Inventors: 尤索·海斯卡宁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2022-05-13
Also published as: KR20220079968A; EP4034965A1; WO2021093951A1

Abstract

A foldable assembly (1) for an electronic device, the foldable assembly (1) comprising a housing (2), the housing (2) comprising a first portion (2a), a second portion (2b) and a third portion (2 c). The first portion (2a) and the second portion (2b) are pivotally connected to opposite edges of the third portion (2c), a first hinge assembly (14) connects the first portion (2a) and the third portion (2c), and a second hinge assembly (15) connects the second portion (2b) and the third portion (2 c). The first portion (2a) is pivotable relative to the third portion (2c) about a first assembly rotation axis (a1) by means of the first hinge assembly (14), and the second portion (2b) is pivotable relative to the third portion (2c) about a second assembly rotation axis (a2) by means of the second hinge assembly (15). A synchronization device (3) connecting the first part (2a) and the second part (2b) such that the first part (2a) and the second part (2b) pivot simultaneously; the simultaneous pivoting comprises a clockwise pivoting of the first part (2a) and a counter-clockwise pivoting of the second part (2b), or a counter-clockwise pivoting of the first part (2a) and a clockwise pivoting of the second part (2 b). Such that any dimensional changes resulting from the folding or unfolding action are counteracted within the foldable module.

Description

Foldable assembly for electronic device

Technical Field

The present invention relates to a foldable assembly for an electronic device, the foldable assembly comprising a housing comprising a first portion, a second portion and a third portion.

Background

The size of mobile devices such as tablet computers and cell phones is an important consideration when designing mobile devices. In order to provide the most suitable mobile device as much as possible, the external dimensions of the device must be as small as technically feasible, while still requiring that the display screen of the device be as large as possible.

This problem may be solved by a foldable electronic device or the like comprising one or more supports interconnected by a hinge, covered by a display screen, etc. One or more of the support and display may be folded together to provide as small an electronic device as possible and unfolded to provide as large a display as possible.

However, when the electronic device is folded, the display screen and/or the rear cover may stretch on one side of the neutral axis and contract on the other side of the neutral axis. The neutral axis is the axis along which the display or housing remains unchanged when folded, i.e. the neutral axis neither stretches nor contracts. Furthermore, the continuous folding of the display screen and/or the rear cover may lead to permanent deformations due to fatigue, since the folding area is subjected to very high stresses.

Disclosure of Invention

It is an object of the present invention to provide an improved foldable module for an electronic device. The above and other objects are achieved by the features of the independent claims. Other implementations are apparent from the dependent claims, the description and the drawings.

According to a first aspect, a foldable assembly for an electronic device is provided. The foldable assembly includes a housing including a first portion, a second portion, and a third portion, the first portion and the second portion being pivotally connected to opposing edges of the third portion; a first hinge assembly connecting the first portion and the third portion, a second hinge assembly connecting the second portion and the third portion; the first portion is pivotable relative to the third portion about a first assembly rotational axis by the first hinge assembly; the second portion is pivotable relative to the third portion about a second assembly axis of rotation by the second hinge assembly, the second assembly axis of rotation extending parallel to the first assembly axis of rotation; the first, second and third portions are aligned on a common plane when the foldable assembly is in the unfolded state; the first, second and third portions overlap one another when the foldable assembly is in a folded state; a synchronization device connecting the first and second portions such that the first and second portions pivot simultaneously; the synchronized pivoting includes the first portion pivoting clockwise and the second portion pivoting counterclockwise, or the first portion pivoting counterclockwise and the second portion pivoting clockwise.

This arrangement allows any dimensional changes in the first hinge assembly resulting from either the folding or unfolding action to be offset within the foldable assembly, since the second hinge assembly is folded in the opposite direction accordingly.

In one possible implementation of the first aspect, the outer surface of the first portion and the outer surface of the second portion extend parallel to each other when the foldable assembly is in the folded state.

In another possible implementation of the first aspect, the second portion overlies a first surface of the third portion and the first portion overlies a second surface of the third portion when the foldable assembly is in the folded state. In this way, extending the second portion and the first portion may provide only a minimal width.

In another possible implementation of the first aspect, a first dimension of an outer surface of the first hinge assembly is greater than a corresponding second dimension of an inner surface of the first hinge assembly and a first dimension of an outer surface of the second hinge assembly is greater than a corresponding second dimension of an inner surface of the second hinge assembly when the foldable assembly is in the folded state. This facilitates symmetrical folding.

In another possible implementation of the first aspect, the first dimension of the outer surface of the first hinge assembly is equal to the first dimension of the outer surface of the second hinge assembly; the second dimension of the inner surface of the first hinge assembly is equal to the second dimension of the inner surface of the second hinge assembly. This eliminates the need to stretch the elements attached to these surfaces.

In another possible implementation of the first aspect, a sum of the first dimension of the outer surface of the first hinge assembly and the second dimension of the inner surface of the second hinge assembly is constant.

In another possible implementation of the first aspect, a sum of the second dimension of the inner surface of the first hinge assembly and the first dimension of the outer surface of the second hinge assembly is constant.

In another possible implementation of the first aspect, the first portion and the second portion pivot at the same speed such that the first portion and the second portion extend at substantially the same angle relative to the third portion when pivoting. This helps to achieve a solution where any elements connected to these parts also keep their outer dimensions constant during folding.

In another possible implementation of the first aspect, the foldable assembly further comprises a first surface layer and a second surface layer attached to opposite surfaces of the housing, the first surface layer and the second surface layer extending parallel to each other and to a main plane of the housing.

In another possible implementation of the first aspect, the housing has a first neutral axis, the first surface layer has a second neutral axis, and the second surface layer has a third neutral axis; a superposition of the first, second and third neutral axes extends in parallel; the second neutral axis is offset from the first neutral axis by a first offset distance in a first direction along an offset axis, wherein the offset axis extends perpendicular to the first and second assembly rotational axes; the third neutral axis is offset from the first neutral axis by a second offset distance in a second direction opposite the first direction. Such that folding of the foldable assembly does not affect the dimensions of the first and second surface layers.

In another possible implementation form of the first aspect, the synchronization device comprises at least one linear drive extending in the direction of a transmission axis extending substantially perpendicular to the first and second assembly rotation axes; a first end of the linear actuator is connected to the first portion and a second end of the linear actuator is connected to the second portion. This allows the linear drive to take up little space and be mounted in any suitable available location.

In another possible implementation of the first aspect, pivoting one of the first and second portions drives the linear actuator such that the linear actuator urges the other of the first and second portions to pivot simultaneously in opposite directions at the same speed. Thus, the linear actuators move synchronously on both sides of the housing.

In another possible implementation form of the first aspect, the synchronization device further comprises a rotating shaft disposed within the third portion, and the linear actuator is connected to the rotating shaft.

In another possible implementation form of the first aspect, the synchronization device further comprises a motor for rotating the rotary shaft, and rotating the rotary shaft moves the linear drive at least partially along the transmission axis. This allows for automatic folding of the foldable module and any electronic device to which the foldable module is mounted.

In another possible implementation form of the first aspect, the rotation axis extends parallel to the first assembly rotation axis and the second assembly rotation axis.

In another possible implementation form of the first aspect, the rotation axis extends perpendicular to the first assembly rotation axis and the second assembly rotation axis.

In another possible implementation form of the first aspect, the linear drive comprises at least one chain, wire and/or sheet material.

In another possible implementation of the first aspect, the linear drive comprises two wire portions extending on equally spaced opposite sides of the first neutral axis. This allows for synchronous driving of the linear drives along the main surface of the electronic device.

In another possible implementation form of the first aspect, the synchronization device further includes at least one pinion surrounding a portion of the rotating shaft, a first rack being engaged with the pinion in a first position, a second rack being engaged with the pinion in a second position opposite to the first position, the first rack and the second rack extending in the direction of the transmission axis. Thus, the two sides of the rotating shaft can move synchronously.

In another possible implementation of the first aspect, the first rack is coupled to and supports the first surface layer, and the second rack is coupled to and supports the second surface layer.

In another possible implementation of the first aspect, the first surface layer and the second surface layer are for sliding on the opposing surface of the third portion of the housing.

In another possible implementation form of the first aspect, the synchronization device further includes a locking device for locking the foldable assembly in at least one of the unfolded state and the folded state, the locking device including a cam member that interlocks with a cam portion provided on the rotating shaft. This allows the foldable assembly to be securely locked into place when in either the unfolded state or the folded state. Furthermore, by providing only one locking means, individual manufacturing tolerances do not accumulate, thereby providing better flatness when in the deployed state, while avoiding the need to move synchronously between several pivot points to provide sufficient locking force.

In another possible implementation of the first aspect, the cam element surrounds a portion of the shaft such that the cam element and the shaft share a central axis. This provides a reliable locking device that takes up little space.

In another possible implementation form of the first aspect, the cam element is disposed near one end of the shaft and extends at least partially in a first plane perpendicular to a central axis of the shaft, and the cam portion extends in the first plane and includes at least one peripheral recess for receiving a portion of the cam element. This can significantly reduce the required locking force on the cam element and the cam portion while keeping the locking force of the device the same. Furthermore, the locking position accuracy is improved.

According to a second aspect, an electronic device is provided. The electronic device comprises a foldable assembly according to the above provided, the first surface layer of the foldable assembly comprising a display screen and the second surface layer of the foldable assembly comprising another display screen or a back cover. This solution enables the display and/or the back cover to slide with respect to the housing when the electronic device is folded, thus avoiding surface wrinkling and/or permanent deformation of the display or the like, since the display neither stretches nor contracts when the device is folded.

In one possible implementation of the second aspect, the linear actuator of the collapsible assembly extends at least partially through a first tunnel in the first hinge assembly and a second tunnel in the second hinge assembly. This avoids shortening the path of the linear drive when the device is folded.

These and other aspects will be apparent from the embodiments described below.

Drawings

In the following detailed description of the invention, aspects, various embodiments, and various implementations will be explained in more detail with reference to exemplary embodiments shown in the accompanying drawings, in which:

FIG. 1a is a schematic side view of an electronic device in an unfolded state according to an embodiment of the present invention;

FIG. 1b shows the embodiment of FIG. 1a in a folded state;

FIG. 1c is a perspective view of the embodiment of FIGS. 1a and 1 b;

FIG. 2 is a partial side view of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 3a is a schematic side view of a housing of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 3b is a side view of an electronic device including the housing of FIG. 3a provided by one embodiment of the invention;

FIG. 4a is a partial perspective view of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 4b is a side view of the embodiment shown in FIG. 4 a;

FIG. 5 is a partial perspective view of a linear actuator of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 6 is a partial perspective view of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 6b is a partial perspective view of the linear actuator of the embodiment of FIG. 6 a;

FIG. 7 is a partial perspective view of a linear actuator of a foldable module provided in accordance with one embodiment of the present invention;

FIG. 8a is a top view of a linear actuator of a foldable module provided in accordance with one embodiment of the present invention;

fig. 8b is a partial side view of the embodiment shown in fig. 8 a.

Detailed Description

Fig. 1a to 1c disclose an electronic device 13 comprising a foldable module 1, more detailed description of which is provided below. The display screen of the electronic device 13 may include

The first surface layer 4 of the foldable module 1 and the further display or back cover of the electronic device 13 may comprise the second surface layer 5 of the foldable module 1. The first surface layer 4 and the second surface layer 5 are supported by the housing 2 comprising a first portion 2a, a second portion 2b and a third portion 2 c. The first and

second portions

2a and 2b are pivotally connected to opposite edges of the third portion 2c by first and

second hinge assemblies

14 and 15.

The first and second surface layers 4, 5 of the foldable module 1 may be attached to opposite surfaces of the housing 2 such that the first and second surface layers 4, 5 extend parallel to each other and to a main plane of the housing 2. The first and second surface layers 4, 5 are preferably fixed to opposite surfaces of the first and

second portions

2a, 2 b. The first surface layer 4 and the second surface layer 5 may be adapted to slide on opposite surfaces of the third portion 2c of the housing 2.

The housing 2 contains most other components of the electronic device, such as batteries, electronic circuitry, optics, acoustics, etc. One or more of the first portion 2a, the second portion 2b and the third portion 2c may be tapered as shown in fig. 3a and 3 b. Accordingly, one or several of the first, second and

third portions

2a, 2b, 2c may have surfaces extending in parallel, i.e. one or more portions are rectangular solids, as shown in fig. 2. Whatever the shape of these parts, the outer surface of the first part 2a and the outer surface of the second part 2b may extend parallel to each other when the foldable assembly 1 is in the folded state P2 (as shown in fig. 1b, 2, 3b and 4 b).

The linear actuator 7 of the collapsible assembly 1 may extend at least partially through a first tunnel 16 in the first hinge assembly 14 and a second tunnel 17 in the second hinge assembly 15, as shown in fig. 5. This supports and holds the linear actuator 7 in the correct position when the collapsible assembly 1 is collapsed.

The first, second and

third portions

2a, 2b, 2c are aligned in a common plane when the foldable module 1 is in the unfolded state P1, and the three portions are superimposed on each other when the foldable module 1 is in the folded state P2. When the foldable assembly 1 is in the folded state P2 (as shown in fig. 1b and 1 c), the second portion 2b may be superimposed on a first surface of the third portion 2c, the first surface comprising a display screen or the like of the electronic device 13; the first portion 2a may be superimposed on a second surface of the third portion 2c, the second surface comprising a back cover or the like of the electronic device 13. In the collapsed state P2, the user may only see about one third of the display screen, while in the expanded state P1, the user may see the entire display screen.

The foldable assembly 1 comprises the above-described housing 2, a first hinge assembly 14 and a second hinge assembly 15, as shown in fig. 2 and 3 b. The first portion 2a is pivotable relative to the third portion 2c about a first assembly rotational axis a1 by a first hinge assembly 14. The second portion 2b is pivotable relative to the third portion 2c by the second hinge assembly 15 about a second assembly rotational axis a2, which extends parallel to the first assembly rotational axis a 1.

The synchronizing device 3 connects the first part 2a and the second part 2b such that the first part 2a and the second part 2b pivot simultaneously, as shown in fig. 4a and 6 a. The simultaneous pivoting includes the first part 2a pivoting clockwise and the second part 2b pivoting counterclockwise, or the first part 2a pivoting counterclockwise and the second part 2b pivoting clockwise.

When the foldable module 1 is pivoted between the unfolded state P1 and the folded state P2, neither the first surface layer 4 nor the second surface layer 5 undergo a dimensional change, and therefore the first surface layer 4 and the second surface layer 5 are preferably made of a material that is bendable, but not necessarily stretchable. Instead, all dimensional changes may be counteracted by simultaneous movement of the first and

second portions

2a, 2b, sliding of the first and second surface layers 4, 5 through the third portion 2c, and/or symmetrical action of the synchronization means 3 through the first and

second hinge assemblies

14, 15.

As shown in fig. 2, when the foldable assembly 1 is in the folded state P2, a first dimension D14a of the outer surface 14a of the first hinge assembly 14 may be greater than a corresponding second dimension D14b of the inner surface 14b of the first hinge assembly 14. Accordingly, when the foldable assembly 1 is in the folded state P2, the first dimension D15b of the outer surface 15b of the second hinge assembly 15 may be greater than the corresponding second dimension D15a of the inner surface 15a of the second hinge assembly 15.

The first dimension D14a of the outer surface 14a of the first hinge assembly 14 may be equal to the first dimension D15b of the outer surface 15b of the second hinge assembly 15, while the second dimension D14b of the inner surface 14b of the first hinge assembly 14 may be equal to the second dimension D15a of the inner surface 15a of the second hinge assembly 15.

The sum of the first dimension D14a of the outer surface 14a of the first hinge assembly 14 and the second dimension D15a of the inner surface 15a of the second hinge assembly 15 may be constant. Accordingly, the sum of the second dimension D14b of the inner surface 14b of the first hinge assembly 14 and the first dimension D15b of the outer surface 15b of the second hinge assembly 15 may be constant.

In one embodiment, the first portion 2a and the second portion 2b pivot at the same speed, such that the first portion 2a and the second portion 2b pivot at substantially the same angle α relative to the third portion 2b₁And alpha₂Extended as shown in fig. 4 b. The foldable module 1 is folded into or unfolded from a Z-shape, and thus the electronic device 13.

The housing 2 may have a first neutral axis N1, the first surface layer 4 may have a second neutral axis N2, and the second surface layer 5 may have a third neutral axis N3. The superposition of the first neutral axis N1, the second neutral axis N2 and the third neutral axis N3 extends in parallel; the second neutral axis N2 is offset in the first direction D1 relative to the first neutral axis N1 by a first offset distance along an offset axis that extends perpendicular to the first and second assembly rotational axes a1 and a 2. Similarly, the third neutral axis N3 is offset from the first neutral axis N1 by a second offset distance in a second direction D2 opposite the first direction D1, as shown in fig. 1 a.

The synchronizing means 3 may comprise at least one linear drive 7, the linear drive 7 extending in the direction of a transmission axis A3, the transmission axis A3 extending substantially perpendicular to the first component rotational axis a1 and the second component rotational axis a 2. A first end 7a of the linear actuator 7 is connected to the first part 2a and a second end 7b of the linear actuator 7 is connected to the second part 2 b. Pivoting one of the first and

second portions

2a, 2b may cause the linear actuator 7 to drive such that the linear actuator 7 urges the other of the first and

second portions

2a, 2b to pivot simultaneously in opposite directions at the same speed.

The linear drive 7 may comprise at least one chain, wire and/or sheet material. The linear drive 7 may also comprise two wire portions extending on equally spaced opposite sides of the first neutral axis N1.

The synchronization means 3 may further comprise a spindle 6 arranged in the third part 2c, the linear drive 7 being connected to the spindle 6, as shown in fig. 6a and 6 b.

The synchronization device 3 may further comprise a motor for rotating the spindle 6, rotating the spindle 6 moving the linear drive 7 at least partly along the transmission axis a 3.

The spindle 6 may extend parallel to the first assembly rotation axis a1 and the second assembly rotation axis a2, as shown in fig. 6a and 6 b.

The synchronization device 3 may further comprise at least one pinion 8, the pinion 8 surrounding a portion of the shaft 6, the first rack 9 being in mesh with the pinion 8 in a first position, the second rack 10 being in mesh with the pinion 8 in a second position opposite to the first position, the first rack 9 and the second rack 10 extending in the direction of the transmission axis a 3.

The first toothed rack 9 may be connected to and support the first surface layer 4 and the second toothed rack 10 may be connected to and support the second surface layer 5. Thus, when the spindle 6 is rotated, the first toothed rack 9 and the first surface layer 4 move in one direction of the transmission axis a 3. Accordingly, the second toothed rack 10 and the second surface layer 5 can be moved in the opposite direction of the transmission axis a 3.

The spindle 6 may also extend perpendicular to the first assembly rotation axis a1 and the second assembly rotation axis a2, as shown in fig. 8a and 8 b.

The synchronizing device 3 may also comprise a locking device 11 as shown in fig. 7. The locking device 11 locks the foldable module 1 to at least one of the unfolded state P1 and the folded state P2, the locking device 11 includes a cam member 11a, and the cam member 11a is interlocked with a cam portion 11b provided on the rotation shaft 6. The cam member 11a may surround a portion of the rotating shaft 6 such that the cam member 11a and the rotating shaft 6 share a central axis.

As shown in fig. 8a and 8b, the cam member 11a may be disposed near one end of the shaft 6 and extend at least partially in a first plane perpendicular to the central axis of the shaft 6, the cam portion 11b extending in the first plane and including at least one peripheral recess 12 for receiving a portion of the cam member 11 a.

Various aspects and implementations have been described herein in connection with various embodiments. 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 word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. A computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the internet or other wired or wireless telecommunication systems.

Reference signs used in the claims shall not be construed as limiting the scope. Unless otherwise indicated, the drawings (e.g., cross-hatching, arrangement of parts, proportion, degree, etc.) are to be read in connection with the specification, and are to be considered a portion of the entire written description of this invention. The terms "horizontal," "vertical," "left," "right," "upward" and "downward" as well as adjective and adverb derivatives thereof (e.g., "horizontally," "rightwardly," "upwardly," etc.) used in the specification refer to the orientation of the illustrated structure, as that figure faces the reader. Similarly, the terms "inwardly" and "outwardly" generally refer to the direction of a surface relative to its axis of elongation or rotation (as the case may be).

Claims

1. A foldable assembly (1) for an electronic device, characterized in that the foldable assembly (1) comprises a housing (2), the housing (2) comprising a first portion (2a), a second portion (2b) and a third portion (2c), the first portion (2a) and the second portion (2b) being pivotally connected to opposite edges of the third portion (2 c);

a first hinge assembly (14) connecting the first portion (2a) and the third portion (2c), a second hinge assembly (15) connecting the second portion (2b) and the third portion (2 c);

said first portion (2a) being pivotable with respect to said third portion (2c) about a first assembly rotation axis (A1) by said first hinge assembly (14);

the second portion (2b) is pivotable relative to the third portion (2c) by the second hinge assembly (15) about a second assembly rotation axis (a2), the second assembly rotation axis (a2) extending parallel to the first assembly rotation axis (a 1);

-when the foldable assembly (1) is in the unfolded state (P1), the first portion (2a), the second portion (2b) and the third portion (2c) are aligned on a common plane;

-when the foldable assembly (1) is in the folded state (P2), the first portion (2a), the second portion (2b) and the third portion (2c) are superimposed on each other;

a synchronization device (3) connecting the first part (2a) and the second part (2b) such that the first part (2a) and the second part (2b) pivot simultaneously;

said simultaneous pivoting comprises a clockwise pivoting of said first portion (2a) and a counter-clockwise pivoting of said second portion (2b), or

The first part (2a) is pivoted anticlockwise and the second part (2b) is pivoted clockwise.

2. The foldable assembly (1) according to claim 1, characterized in that the outer surface of the first part (2a) and the outer surface of the second part (2b) extend parallel to each other when the foldable assembly (1) is in the folded state (P2).

3. The foldable module (1) according to claim 1 or 2, characterized in that the second portion (2b) is superimposed on a first surface of the third portion (2c) and the first portion (2a) is superimposed on a second surface of the third portion (2c) when the foldable module (1) is in the folded state (P2).

4. The foldable assembly (1) according to any of the preceding claims, characterized in that a first dimension (D14a) of an outer surface (14a) of the first hinge assembly (14) is larger than a corresponding second dimension (D14b) of an inner surface (14b) of the first hinge assembly (14) when the foldable assembly (1) is in the folded state (P2),

a first dimension (D15b) of an outer surface (15b) of the second hinge assembly (15) is greater than a corresponding second dimension (D15a) of an inner surface (15a) of the second hinge assembly (15).

5. The foldable assembly (1) according to claim 4, characterized in that said first dimension (D14a) of said outer surface (14a) of said first hinge assembly (14) is equal to said first dimension (D15b) of said outer surface (15b) of said second hinge assembly (15);

the second dimension (D14b) of the inner surface (14b) of the first hinge assembly (14) is equal to the second dimension (D15a) of the inner surface (15a) of the second hinge assembly (15).

6. Foldable assembly (1) according to claim 4 or 5, characterized in that the sum of said first dimension (D14a) of said outer surface (14a) of said first hinge assembly (14) and said second dimension (D15a) of said inner surface (15a) of said second hinge assembly (15) is constant.

7. Collapsible assembly (1) according to any of the claims 4 to 6 wherein the sum of the second dimension (D14b) of the inner surface (14b) of the first hinge assembly (14) and the first dimension (D15b) of the outer surface (15) of the second hinge assembly (15) is constant.

8. The foldable module (1) according to any of the preceding claims, characterized in that the first part (2a) and the second part (2b) pivot at the same speed, such that the first part (2a) and the second part (2b) pivot at substantially the same angle (a) relative to the third part (2b)₁And alpha₂) And (4) extending.

9. The foldable assembly (1) according to any of the preceding claims, characterized in that the foldable assembly (1) further comprises a first surface layer (4) and a second surface layer (5) attached to opposite surfaces of the housing (2), the first surface layer (4) and the second surface layer (5) extending parallel to each other and to a main plane of the housing (2).

10. The foldable module (1) according to claim 9, characterized in that the housing (2) has a first neutral axis (N1), the first surface layer (4) has a second neutral axis (N2), the second surface layer (5) has a third neutral axis (N3);

a superposition of the first neutral axis (N1), the second neutral axis (N2) and the third neutral axis (N3) extends in parallel;

the second neutral axis (N2) is offset in a first direction (D1) by a first offset distance relative to the first neutral axis (N1) along an offset axis, wherein the offset axis extends perpendicular to the first assembly rotational axis (A1) and the second assembly rotational axis (A2); the third neutral axis (N3) is offset in a second direction (D2) opposite the first direction (D1) by a second offset distance relative to the first neutral axis (N1).

11. A foldable module (1) according to any of the preceding claims, characterized in that the synchronizing means (3) comprise at least one linear actuator (7), the linear actuator (7) extending in the direction of a transmission axis (A3), the transmission axis (A3) extending substantially perpendicular to the first module rotation axis (A1) and the second module rotation axis (A2);

a first end (7a) of the linear actuator (7) is connected to the first part (2a) and a second end (7b) of the linear actuator (7) is connected to the second part (2 b).

12. The foldable module (1) according to claim 11, characterized in that pivoting one of the first part (2a) and the second part (2b) drives the linear actuator (7) such that the linear actuator (7) pushes the other of the first part (2a) and the second part (2b) to pivot simultaneously in opposite directions at the same speed.

13. A foldable module (1) according to claim 11 or 12, characterized in that the synchronizing means (3) further comprises a spindle (6) arranged in the third part (2c), the linear drive (7) being connected to the spindle (6).

14. Foldable module (1) according to claim 13, characterized in that said synchronization means (3) further comprise a motor for rotating said spindle (6), rotating said spindle (6) moving said linear drive (7) at least partially along said transmission axis (a 3).

15. Foldable module (1) according to claim 13 or 14, characterized in that said spindle (6) extends parallel to said first module rotation axis (a1) and said second module rotation axis (a 2).

16. Foldable module (1) according to any of the claims 13 to 15, characterized in that the rotation axis (6) extends perpendicular to the first module rotation axis (a1) and the second module rotation axis (a 2).

17. The foldable module (1) according to any of claims 13 to 16, characterized in that the linear drive (7) comprises at least one chain, wire and/or sheet material.

18. Foldable module (1) according to claim 17, characterized in that the linear actuator (7) comprises two wire portions extending on equally spaced opposite sides of the first neutral axis (N1).

19. Foldable assembly (1) according to any one of claims 11 to 18, characterized in that said synchronization means (3) further comprise at least one pinion (8), said pinion (8) surrounding a portion of said rotation shaft (6), a first rack (9) meshing with said pinion (8) in a first position, a second rack (10) meshing with said pinion (8) in a second position opposite to said first position, said first rack (9) and said second rack (10) extending in the direction of said transmission axis (a 3).

20. Foldable module (1) according to claim 19, characterized in that said first rack (9) is connected to and supports said first surface layer (4) and said second rack (10) is connected to and supports said second surface layer (5).

21. The foldable assembly (1) according to any of claims 9 to 20, characterized in that the first surface layer (4) and the second surface layer (5) are adapted to slide on the opposite surfaces of the third portion (2c) of the housing (2).

22. An electronic device (13), characterized in that the electronic device (13) comprises a foldable assembly (1) according to any of claims 1-21, the first surface layer (4) of the foldable assembly (1) comprising a display screen;

the second surface layer (5) of the foldable module (1) comprises another display screen or a back cover.

23. The electronic device (13) of claim 22, wherein the linear actuator (7) of the foldable assembly (1) extends at least partially through a first tunnel (16) in the first hinge assembly (14) and a second tunnel (17) in the second hinge assembly (15).