CN116736474A

CN116736474A - Prism assembly, prism motor and electronic equipment

Info

Publication number: CN116736474A
Application number: CN202210570009.0A
Authority: CN
Inventors: 夏太红
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-03-03
Filing date: 2022-05-24
Publication date: 2023-09-12

Abstract

The prism assembly, the prism motor and the electronic equipment can be applied to electronic equipment such as mobile phones, digital cameras, wearable equipment, vehicle-mounted equipment or other portable products, the prism assembly is configured so that the torque of gravity relative to the rotation center of the prism assembly is in a theoretical design range, the static attitude and the potential difference of the prism motor can be ensured, the risks of resonance and shaking impact abnormal sound are reduced, the assembly precision of the prism is improved, the moment generated by the gravity center of the prism assembly can be almost zero or zero through reasonable configuration, the driving force required by the prism motor is effectively reduced, and the reduction of power consumption is realized.

Description

Prism assembly, prism motor and electronic equipment

Technical Field

The present application relates to the field of electronic products, and in particular, to a prism assembly, a prism motor, and an electronic device.

Background

In order to meet the requirements of ultrathin electronic products and high pixels, periscope type prism motors are increasingly widely applied to imaging systems. However, periscope type prism motors have complex structures, and the current prism motors often generate shaking abnormal sound and prism assembly errors when in use.

Disclosure of Invention

The embodiment of the application provides a prism motor and electronic equipment, wherein the power consumption of the prism motor is lower.

In one embodiment, a prism assembly for a prism motor includes at least a prism and a prism support having a center of rotation relative to a base of the prism motor, the prism assembly configured such that a torque of gravity relative to the center of rotation is within a theoretical design range, the theoretical design range being zero or a range of values near zero.

According to the application, the torque of the gravity of the prism assembly relative to the rotation center is in a theoretical design range, so that the static attitude potential difference of the prism motor can be ensured, the risk of collision abnormal sound is reduced, the assembly precision of the prism is improved, the moment generated by the gravity center of the prism assembly can be almost zero through reasonable configuration, the driving force required by the prism motor is effectively reduced, and the reduction of power consumption is realized.

In one example, the prism support has a material density less than that of the prism, and the prism assembly further includes a weight member secured to the prism support on a side thereof remote from the center of gravity of the prism for balancing torque generated by at least a portion of the prism weight. In a specific example, the prism support may be made of plastic, and the prism may be made of glass. The additional addition of the weight component to the current prism support achieves the purpose of relatively small torque of the prism assembly gravity relative to the rotation center line, and the improvement cost is relatively low.

In one example, the center of gravity of the prism assembly coincides with the center of rotation. In this example, the moment generated by the center of gravity of the prism assembly is zero, so that the driving force required by the prism motor is reduced to the greatest extent, and the power consumption is low.

In one example, the prism assembly further comprises a magnet assembly secured to the prism mount for cooperating with a drive coil of the prism motor to drive the prism assembly to rotate about the center of rotation; the counterweight component is the magnet assembly. The example uses the magnet assembly generating the driving force as a counterweight part, not only can meet the driving requirement, but also reduces the driving force of the prism motor on the basis of not adding redundant parts, and the prism motor is compact in size and low in power consumption.

In one example, the magnet assembly includes a first magnet and a second magnet, the first magnet having a volume greater than a volume of the second magnet, the first magnet being located on a side of the second magnet away from the light exit surface of the prism. Therefore, the volume of the first magnet is increased to the side far away from the prism, and correspondingly, the whole gravity center position of the prism assembly is correspondingly closed to the rotation center, so that the adjustment is flexible, and the effect is better.

In one example, the first magnet and the second magnet are rectangular solids having a thickness, adjacent side dimensions of the first magnet and the second magnet are equal, and another side dimension of the first magnet is larger than another side dimension of the second magnet. In the example, the prism and the two magnets are simple in structure and easy to process and install.

In one example, the number of the magnet assemblies is two, the magnet assemblies are respectively located on a first side face and a second side face of the prism support, the first side face is perpendicular to the prism, the second side face is perpendicular to a light inlet main shaft of the prism, and the first side face is parallel to an end face of the prism. The two magnet assemblies are respectively defined as a first magnet assembly and a second magnet assembly, a first driving coil and a second driving coil are arranged on the base, the first driving coil and the first magnet assembly are matched to generate driving force for enabling the prism assembly to rotate around a light inlet main shaft, and the second driving coil and the second magnet assembly are matched to generate driving force for enabling the prism assembly to rotate around a second shaft perpendicular to a plane determined by the light inlet main shaft and the light outlet main shaft.

In a second aspect, the present application also provides a prism motor, including a base and a prism assembly as described in any one of the above.

In a third aspect, the present application also provides an electronic device, including the prism motor described in any one of the above.

The prism motor and the electronic device of the application comprise the prism assembly, so the application also has the technical effects of the prism assembly.

Drawings

FIG. 1 is a schematic diagram of an imaging module according to an embodiment of the application;

FIG. 2 is a partial three-dimensional schematic view of the prism motor of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view illustrating assembly of the prism support, the first magnet assembly, and the elastic sheet of FIG. 2;

FIG. 5 is an assembled schematic view of a portion of the components of FIG. 2;

FIG. 6 is another angular schematic view of the structure of FIG. 5;

FIG. 7 is a schematic diagram illustrating assembly of the second magnet assembly of FIG. 6 except for other components;

fig. 8 is an exploded view of the main structure of fig. 1.

Wherein, the one-to-one correspondence between the reference numerals and the component names in fig. 1 to 8 is as follows:

100 imaging modules; 1, a shell; 1a light holes; 3, a lens assembly; 4 lens motor carrier;

2a prism motor; 20 base, 21 prism; 211 light inlet surface; 212 light-emitting surface; 213 reflective light surface; 22 prism support; 220 a main body; 221 sidewalls; 222 inclined walls; 223 convex portion; 224 a first groove; 225 a second groove; 226 cavity; 22a first side; 22b second side; 23 a first drive coil; a second drive coil 24; 25 a first magnet assembly; 251 a first magnet; 252 a second magnet; a second magnet assembly 26; 27 elastic sheets; 28 fixing frames; 29 a support; 291 extension; a 30PCB board; 2-1 ball part; 2-2 lining board.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Aiming at the technical problems that the current prism motor is easy to generate jitter abnormal sound and prism assembly error when in use, the application carries out intensive research and finds that: because the current prism is different from the prism support materials for fixing the current prism, the density of the prism material is larger, and the density of the prism support is lighter, the weight of the prism is always higher than that of the prism support where the prism support is positioned, so that the center of gravity of the prism is inclined to one side of the prism after the prism and the prism are assembled, the center of rotation is positioned at the side of the prism support, the center of gravity is not overlapped with the center of rotation, and the gravity causes the rotation moment to cause the prism motor to incline under the condition of not being electrified, thereby easily generating shaking abnormal sound and prism assembly errors. Meanwhile, gravity moment can generate reaction force to driving force, so that the power consumption of the prism motor is increased.

Based on the above findings, the present application proposes a technical solution, which can eliminate or reduce the probability of occurrence of the above technical problems.

Referring to fig. 1 and 8, fig. 1 is a schematic diagram of an imaging module according to an embodiment of the application, and fig. 8 is an exploded view of the main structure of fig. 1.

The embodiment of the application provides an electronic device, which includes an imaging module 100, where the imaging module 100 includes a prism motor 2, a lens assembly 3, and a lens motor carrier 4, the lens assembly 3 is not shown in fig. 1 (blocked by the housing 1), and the lens assembly 3 is located at a right side position of the prism motor 2 in fig. 1. The prism motor 2 and the lens assembly 3 may be assembled inside the housing 1, and the housing 1 mainly protects the components located inside. The casing 1 is provided with a light hole 1a, external light firstly enters the prism motor 2, and then enters the lens assembly 3 after being refracted by the prism motor 2. In fig. 1, a main light path direction S entering the prism motor 2 is shown, an outgoing light path direction S1 refracted by the prism motor 2 is shown, and light enters the lens assembly along the outgoing light path direction S1. For an electronic device, S is generally a thickness direction of the electronic device, and S1 is generally a length direction of the electronic device.

Referring to fig. 2 to 4, fig. 2 is a schematic partial three-dimensional view of the prism motor in fig. 1. FIG. 3 is a cross-sectional view A-A of FIG. 2; FIG. 4 is a schematic view illustrating assembly of the prism support, the first magnet assembly, and the elastic sheet in FIG. 2.

Wherein the prism motor 2 further comprises a base 20, a first driving coil, a prism 21 and a prism holder 22. Referring to fig. 3, the prism 21 may be a triangular prism, which is a prism with a right triangle cross section, and its peripheral surface includes three surfaces connected end to end in sequence: the light incident surface 211, the light emergent surface 212 and the reflective surface 213, wherein the light incident surface 211 and the light emergent surface 212 are generally vertical, and the reflective surface 213 is an inclined surface connected between the light incident surface 212 and the light emergent surface 212. Only the light-entering surface 211 is shown in fig. 2, and other light-entering surfaces can be understood in conjunction with fig. 3, and the three-dimensional structure of other light-entering surfaces is not shown, so that the understanding of the technical solution herein by those skilled in the art is not hindered. The external light enters the prism 21 through the light inlet surface, and is reflected by the reflecting surface and then exits the prism 21 through the light outlet surface. The reflective surface is typically mounted opposite the angled wall 222 of the prism mount. The prism 21 is not limited to the triangular prism described herein, but may be other types of prisms, and the main function thereof is to change the light propagation path to meet the requirement of the mounting position of the lens assembly 5. The technical solution and the technical effects will be further described by taking the prism 21 as a triangular prism.

Referring to fig. 4, in a specific example, the prism support 22 includes a main body 220, the main body 220 has two side walls 221, an inclined wall 222 is disposed between the two side walls 221, the inclined wall 222 and the two side walls 221 enclose an installation space for installing the prism 21, and for a triangular prism, the installation space is substantially an angular structure matched with the triangular prism. The reflective surface of the prism 21 is opposite the slanted wall 222. As can be seen from fig. 3 to 6, most of the structure of the prism 21 may be located in the installation space defined by the inclined wall 222 and the two side walls 221 for installing the prism 21, and not the entire prism 21 may be located entirely inside the installation space, so that the position of the prism 21 is convenient to adjust. It is of course not excluded that the prism 21 is entirely located inside the installation space, and a sufficient space is reserved between the prism 21 and the prism support 22, so that the position of the prism 21 can be adjusted to implement the anti-shake function of the imaging module.

The prism 21 is fixed to the prism support 22 to form a prism assembly, and the prism 21 may be fixed to the prism support 22 by dispensing, for example, between two side walls 221 of the prism support 22 and corresponding side walls of the prism 21. Of course, the fixation of the prism 21 to the prism holder 22 is not limited to the description herein, but may be other ways.

The prism assembly is rotatably supported on the base 20, and typically the prism support 22 is rotatably supported with the base 20. I.e. the prism holder 22 has a rotation center O which rotates with respect to the base 20 of the prism motor 2.

The prism assembly of the present application is configured such that the torque of its gravitational force with respect to the center of rotation O is within a theoretical design range, which is a zero or near zero range of values.

According to the application, the torque of the gravity of the prism assembly relative to the rotation center O is in a theoretical design range, so that the static attitude potential difference of the prism motor can be ensured, the risks of resonance and shaking impact abnormal sound are reduced, the assembly precision of the prism is improved, the moment generated by the gravity center of the prism assembly can be almost zero or zero through reasonable configuration, and the driving force required by the prism motor is effectively reduced, thereby realizing the reduction of power consumption.

In the present application, the prism 21 is made of glass, and the prism support 22 is made of plastic. Of course, the materials of the prism 21 and the prism support 22 are not limited to the description herein, and the material density of the prism support 22 is generally smaller than that of the prism 21, so that the center of gravity of the assembly formed by assembling the prism 21 and the prism support 22 is deviated to one side of the prism 21, and is not located at the center of the assembly, but the rotation center O is generally located at the center of the prism assembly, so that the center of gravity of the prism assembly is close to the rotation center as much as possible, and the prism assembly of the present application is further configured as follows.

In one example, the prism assembly further includes a weight member fixed to the side of the prism support 22 away from the center of gravity of the prism 21, and in this embodiment, the distance between the center of gravity O' and the center of rotation O of the prism assembly formed by the prism 21, the prism support 22, and the weight member is relatively small or coincides, so that the torque of the gravity of the prism assembly formed by the prism, the prism support, and the weight member is relatively small with respect to the center of rotation.

Thus, the additional weight component can be added on the existing prism support 22, so that the torque of the gravity of the prism assembly relative to the rotation center can be smaller, and the improvement cost is lower.

Of course, it is desirable that the center of gravity O' of the prism assembly coincides with the center of rotation O so that the prism assembly generates little torque at the center of rotation O in a static state.

The shape and materials of the weight component can be reasonably selected according to specific products, and even if the structural parameters of the weight component are not disclosed herein, the weight component will not cause any obstacle to the understanding and implementation of the technical solutions described herein by those skilled in the art. When the imaging module is subjected to anti-shake function operation, the power for rotating the prism assembly relative to the rotation center O can be derived from the magnet assembly and the driving coil, one of the magnet assembly and the driving coil is installed on the prism assembly, and the other one is installed on the base. That is, the magnet assembly may be mounted on the prism support 22 of the prism assembly or on the base 20, and the driving coil that cooperates with the magnet assembly may be mounted on the base 20 or on the prism support 22. The technical solution and effects will be described further herein by taking the example of the prism support 22 in which the magnet assembly is fixed to the prism assembly.

In one embodiment, the prism assembly further comprises a magnet assembly secured to the prism support 22 for cooperating with a drive coil of the prism motor to drive the prism assembly to rotate about the center of rotation O; when the driving coil is electrified, a driving force is generated between the driving coil and the magnet assembly, and the prism assembly can rotate relative to the rotation center under the action of the driving force. The change in the direction of the driving force can also be achieved by changing the direction of the current flowing in the driving coil. The driving coil generally includes a first end and a second end electrically connected to an external current, and if the current supplied from the first end is defined as a forward current, the current supplied from the second end is a reverse current, the driving coil and the magnet assembly generate a first driving force for rotating the prism assembly clockwise when the driving coil supplies the forward current, and the driving coil and the magnet assembly generate a second driving force for rotating the prism assembly counterclockwise when the driving coil supplies the reverse current. The first driving force and the second driving force are opposite in direction, and the magnitude of the first driving force and the second driving force can be controlled by the magnitude of the current.

In this embodiment, the weight member is a magnet assembly.

The drive coil and magnet assembly may be more than one group, the assembly formed by the drive coil and magnet assembly is defined herein as a drive coil assembly, and the drive coil assembly may include a first drive coil assembly and a second drive coil assembly according to the installation position; the first drive coil assembly is used for driving the prism assembly to rotate around a first axis Z1, the second drive coil assembly is used for driving the prism assembly to rotate around a second axis, the first drive coil assembly is located on a first side surface 22a of the prism assembly, the second drive coil assembly is located on a second side surface 22b of the prism assembly, and the first axis and the second axis are not parallel.

According to the application, the prism assembly can rotate around the first shaft Z1 and the second shaft Z2 under the drive of the first driving coil assembly and the second driving coil assembly respectively, and the first driving coil assembly and the second driving coil assembly only occupy two side spaces of the prism assembly, so that the motor design space is saved, the motor size is reduced, and meanwhile, the motor cost and the process difficulty are reduced.

Referring to fig. 3, in this application, the first axis Z1 is parallel to the light entrance axis S of the prism assembly, i.e. the prism assembly can rotate around a direction parallel to the light entrance axis S. Ideally, the first axis Z1 coincides with the light-entering main axis S, and the first axis Z1 and the light-entering main axis S may not coincide in consideration of privacy such as assembly errors, and the prism assembly may be rotated by a predetermined angle around the first axis Z1 under the driving of the first driving coil assembly.

In this application, the second axis Z2 is perpendicular to the plane defined by the light entrance axis S and the light exit axis S1 of the prism assembly, i.e., the prism assembly can be rotated around the O point in a section parallel to that shown in fig. 3, that is, the prism assembly can be rotated clockwise or counterclockwise by a predetermined angle around the O point in the section (vertical plane) shown in fig. 3 by the driving of the second driving coil assembly.

In one example, the first driving coil assembly includes a first driving coil 23 and a first magnet assembly 25, one of which is fixed to the base 20, and the other of which is fixed to the prism assembly; the first drive coil 23 is shown secured to the base 20 (the base is not shown, but does not obscure the understanding of the present disclosure by those skilled in the art), the first magnet assembly 25 is secured to a particular embodiment of the prism support 22, and of course, the first drive coil 23 is also secured to the prism support 22, and the first magnet assembly 25 is secured to the base 20. In which fig. 2 shows the general direction in which the first drive coil 23 is energized to generate the driving force F. The first magnet assembly 25 may include one magnet, but may have two or more magnets, and specific examples including two magnets are given below.

In one example, the first magnet assembly 25 includes a first magnet 251 and a second magnet 252, where the first magnet 251 has a larger volume than the second magnet 252, such that the first magnet 251 has a larger weight than the second magnet 252, and because the first magnet 251 is located on a side of the second magnet 252 away from the light-emitting surface 22 of the prism 21, as will be appreciated with reference to fig. 3, the light-incident surface 211 and the light-emitting surface 212 are perpendicular to each other, the refraction surface 213 is an inclined surface, and the refraction surface 213 is located opposite to the convex portion 223 of the prism support 22. As can be seen from fig. 4, the inclined wall 222 of the prism support 22 is provided with protrusions 223 at four corners (lower left corner protrusions are not shown), the refraction surface 213 of the prism 21 is partially adhered and fixed to the protrusions 223, and gaps are provided between other positions of the refraction surface 213 of the prism 21 and the inclined wall, as will be understood with reference to fig. 3. The torque generated by the first magnet 251 and the second magnet 252 with respect to the rotation center O is equal to the torque generated by the gravity of the prism support 22 and the prism 21 with respect to the rotation center O, and the directions are different.

The first magnet 251 and the second magnet 252 are generally rectangular parallelepiped, the first magnet 251 and the second magnet 252 are rectangular parallelepiped having a thickness, adjacent side dimensions of the first magnet 251 and the second magnet 252 are equal, and the other side dimension of the first magnet 251 is larger than the other side dimension of the second magnet 252. That is, when the first magnet 251 and the second magnet 252 have the same thickness and one side has the same size, the other side may have different sizes by arranging the sizes of the other sides.

Referring to fig. 5 and 6, fig. 5 is an assembled schematic view of part of the components in fig. 2; fig. 6 is a schematic diagram of the deletion driving coil of fig. 5. In the first magnet assembly 25 attached to the first side 22a, the first magnet 251 and the second magnet 252 have the same thickness dimension in the S direction and the S2 direction, and differ only in the second side dimension in the S1 direction. Similarly, the first side dimension of the first magnet 251 and the second magnet 252 in the S2 direction in the second magnet assembly 26 are the same as the thickness in the S direction, and the difference is that the second side dimension in the S1 direction is different.

Of course, the first magnet 251 and the second magnet 252 may have other shapes as long as the above-described technical effects can be achieved.

In this embodiment, the magnet assembly is used as the counterweight member, so that the technical problems in the prior art can be solved without adding redundant members.

The prism is a triple prism, and the number of the magnet assemblies is two and the magnet assemblies are respectively positioned on a first side face and a second side face of the prism support which are perpendicular to each other. The first driving coil and the first magnet assembly are matched to generate driving force for enabling the prism assembly to rotate around a light inlet main shaft, the second driving coil and the second magnet assembly are matched to generate driving force for enabling the prism assembly to rotate around a second shaft perpendicular to a plane determined by the light inlet main shaft and the light outlet main shaft, the second side face is perpendicular to the light inlet main shaft of the prism, and the first side face is parallel to the end face of the prism.

Energizing the first drive coil 23 generates a force with the first magnet assembly 25 to rotate the prism support 22 about the first axis Z1.

Of course, the force generated by the first driving coil 23 is not limited to a magnet, and may be another magnetic field member capable of generating a magnetic field.

In this application, the second drive coil assembly includes a second drive coil 24 and a second magnet assembly 26, one of which is secured to the base and the other of which is secured to the prism assembly. In fig. 3, a specific embodiment in which the second driving coil is fixed to the base and the second magnet assembly is fixed to the prism support is shown, however, the second driving coil is also fixed to the prism support and the second magnet assembly is fixed to the base. In one example, the second magnet assembly includes a first magnet and a second magnet, which may be equal in size or different.

Energizing the second drive coil 24 may generate a force with the second magnet assembly 26 to rotate the prism support 22 about the second axis Z2.

Referring to fig. 7, the first side 22a and the second side 22b of the prism support may be two sides perpendicular to each other, and the first side 22a and the second side 22b may be respectively provided with a first groove 224 and a second groove for mounting the first magnet assembly and the second magnet assembly.

Of course, the force generated by the second drive coil 24 is not limited to a magnet, and may be another magnetic field member capable of generating a magnetic field.

In this application, the prism support 22 is spherically supported with the base 20, and the prism support 22 rotates about the spherically supported position.

Referring again to fig. 3, in one example, the prism support further includes a support 29 fixedly connected to the base 20, the support 29 has an extension 291 parallel to the light exit main axis S1 of the prism, and the extension 291 extends into the prism support 22 and is spherically supported by the prism support 22. It should be noted that the extension 291 extends parallel to the light-emitting main axis S1, and is merely a general direction indicating the length of the extension S1, and is not absolutely parallel to the light-emitting main axis S1. Specifically, the prism support 22 may have a cavity 226 open toward an extension, and the extension 291 is inserted into the cavity 226 from the opening and is in spherical contact with an inner wall of the cavity 226. Specifically, the right end portion of the extension 291 is spherically abutted against the opposite inner wall of the cavity 226 so that the support 29 can relatively rotate about its spherical contact position with the prism support 22.

Specifically, one of the end of the extension 291 and the inner wall of the cavity 226 may have a ball 2-1, and the other may be disposed in a recess in which the ball 2-1 is engaged. An embodiment of the extension 291 having a ball portion 2-1 is shown in fig. 3. The fixing mode is relatively simple in structure and easy to implement. Of course, the sphere 2-1 may be secured to the inner wall of the cavity 226.

To improve the stability of the positioning of the prism assembly, a resilient tensioning member is also included, which is tensioned between the base 20 and the prism support 22, such that the prism support 22 abuts the support 29. In particular, the elastic tensioning member comprises an elastic sheet. The two ends of the elastic sheet are fixedly connected with the two side walls of the prism support, and the middle area is fixedly connected with the prism support. The positions of the elastic sheet in the P1 position and in the P2 position are shown in fig. 6, wherein the elastic sheet in the P1 position shows only a part of the structure connected to the base. The partial structure of the elastic sheet 27 in the P1 position in fig. 4 to 7 is shown by a dotted line, and the partial structure of the elastic sheet 27 in the P1 position is mainly from the view overall label clarity, and the view overall structure label is not affected by the two-position illustration of the elastic sheet, so that the technical scheme is easy to be understood by those skilled in the art.

The elastic sheet 27 may be a material having elastic deformability, such as a spring sheet, etc., as long as it can provide an elastic force satisfying the use requirement.

In addition, the prism motor further includes a PCB board 30 electrically connected to the first driving coil 23 and the second driving coil 24.

In addition, a wear-resistant lining plate 2-2 can be added between the supporting body 29 and the prism support 22. The backing plate 2-2 is secured to the cavity 226 with the extension 291 in spherical contact with the backing plate 2-2. This minimizes the wear of the extension to the prism support 22. The liner 2-2 may be secured within the cavity 226 by adhesive or the like. The support 29 may be provided with a lining plate 2-2 at a position which is possibly contacted with the prism support 22 during rotation, so as to reduce abrasion to the prism support 22 as much as possible, the specific structure of the lining plate 2-2 may be specific to the product, the shape of the lining plate 2-2 is not disclosed herein, and the understanding and implementation of the technical scheme in the art are not influenced.

In FIG. 3, the liner plate 2-2 is shown to have a generally L-shaped configuration, with the ball 2-1 mounted on the right end of the extension 291 engaging the riser ball surface of the liner plate 2-2.

The prism motor and the electronic device of the application comprise the prism assembly, so that the prism motor and the electronic device also have the technical effects of the prism assembly.

The electronic device in the above embodiment may be a mobile phone, but certainly not limited to a mobile phone, and may be other electronic devices, and the scheme may be adopted as long as the electronic device has a requirement of a camera function, for example, the electronic device may be a notebook computer, and may also be a wearable device, a vehicle-mounted device, an augmented reality (augmented reality, AR)/Virtual Reality (VR) device, a mobile terminal such as an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (personal digital assistant, PDA), or may also be a professional camera such as a digital camera, a single-lens/micro-lens, a motion video camera, a cradle head camera, an unmanned aerial vehicle, or the like.

The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.

Claims

1. A prism assembly for a prism motor, comprising at least a prism and a prism support, the prism support having a center of rotation relative to a base of the prism motor, the prism assembly being configured such that a torque of gravity relative to the center of rotation is within a theoretical design range, the theoretical design range being a zero or near zero range of values.

2. The prism assembly according to claim 1, wherein a center of gravity of the prism assembly coincides with the center of rotation.

3. A prism assembly according to claim 1 or claim 2, wherein the prism support has a material density less than that of the prism, the prism assembly further comprising a counterweight member secured to a side of the prism support remote from the centre of gravity of the prism.

4. The prism assembly of claim 2, further comprising a magnet assembly secured to the prism mount for cooperating with a drive coil of the prism motor to drive the prism assembly to rotate about the center of rotation; the counterweight component is the magnet assembly.

5. A prism assembly according to claim 4, wherein the magnet assembly comprises a first magnet and a second magnet, the first magnet having a volume greater than the second magnet, the first magnet being located on a side of the second magnet away from the light exit surface of the prism.

6. The prism assembly according to claim 5, wherein the first magnet and the second magnet are rectangular solids having a thickness, adjacent side dimensions of the first magnet and the second magnet are equal, and another side dimension of the first magnet is larger than another side dimension of the second magnet.

7. The prism assembly according to any one of claims 4 to 6, wherein the number of the magnet assemblies is two, and the magnet assemblies are respectively located on a first side surface and a second side surface which are perpendicular to each other of the prism support, the prism is a triangular prism, the second side surface is perpendicular to a light inlet main shaft of the prism, and the first side surface is parallel to an end surface of the prism.

8. The prism assembly according to any one of claims 1 to 7, wherein the prism is made of glass and the prism support is made of plastic.

9. A prismatic motor comprising a base and a prismatic assembly according to any of claims 1 to 8.

10. An electronic device comprising the prism motor of claim 9.