CN116203776A - Prism assembly, zoom lens, camera module and terminal equipment - Google Patents

Abstract

The application provides a prism assembly, a zoom lens, a camera module and terminal equipment, wherein the prism assembly is applied to the zoom lens and comprises a plurality of prisms, and each prism comprises an incident surface and an emergent surface; the prism assembly is rotatable between a first position and a second position; when the prism assembly is positioned at the first position, in one prism, the incident surface faces to the object side, the emergent surface faces to the image side, and the zoom lens has a first focal length; when the prism assembly is positioned at the second position, in the other prism, the incident surface faces to the object side, the emergent surface faces to the image side, and the zoom lens is provided with a second focal length which is different from the first focal length. According to the embodiment of the application, the optical zooming effect of the camera module can be achieved only by utilizing the mode of the prism assembly to rotate, and meanwhile, the module size of the camera module is reduced due to the fact that a plurality of groups of lens assemblies do not need to be moved, so that the occupied space of the camera module in terminal equipment is reduced.

Description

Prism components, zoom lenses, camera modules and terminal devices

Technical Field

The present application relates to the field of camera technology, and in particular to a prism assembly, a zoom lens, a camera module and a terminal device.

Background Art

In the camera module of the existing terminal equipment, at least two groups of lens components need to move along the optical axis to achieve the zoom function, which increases the space occupied by the camera module in both the length and width directions, and is not conducive to being placed in terminal equipment products with increasingly tight internal space.

Summary of the invention

The purpose of the embodiments of the present application is to provide a prism assembly, a zoom lens, a camera module and a terminal device. The prism assembly can realize the zoom effect of the zoom lens, and at the same time help to reduce the module size of the camera module, thereby helping to reduce the space occupied by the camera module in the terminal device.

The embodiment of the present application provides a prism assembly, which is applied to a zoom lens. The prism assembly includes a plurality of prisms, and each prism includes an incident surface and an exit surface;

The prism assembly is rotatable between a first position and a second position;

When the prism assembly is in the first position, in one prism, the incident surface faces the object side, the exit surface faces the image side, and the zoom lens has a first focal length;

When the prism assembly is located at the second position, in the other prism, the incident surface faces the object side, the exit surface faces the image side, and the zoom lens has a second focal length, which is different from the first focal length.

In the prism assembly provided in the embodiment of the present application, by rotating the prism assembly, the incident surfaces of different prisms in the prism assembly can be adjusted to face the object, thereby facilitating the change of the focal length of the zoom lens, and further achieving the optical zoom of the camera module. Compared with the existing method of driving at least two groups of lens assemblies to move relative to each other along the optical axis direction of the lens assembly to achieve the zoom function of the camera module, the embodiment of the present application can achieve the effect of the optical zoom of the camera module only by rotating the prism assembly. At the same time, since there is no need to move multiple groups of lens assemblies, it is also helpful to reduce the module size of the camera module, thereby helping to reduce the space occupied by the camera module in the terminal device.

In addition, in the prism assembly of the embodiment of the present application, by flexibly changing the optical materials of multiple prisms in the prism assembly, spherical aberration and other geometric aberrations caused by changes in the prism structure can be corrected, and the chromatic aberration difference caused by zooming can be compensated, thereby achieving aberration correction of the camera module.

In a possible implementation, the curvatures of the incident surfaces of the multiple prisms are different, and/or the curvatures of the exit surfaces of the multiple prisms are different. By flexibly changing the curvatures of the incident surfaces and/or exit surfaces of different prisms, the optical paths of light in different prisms are made different. When the prism assembly rotates, the incident surfaces of different prisms in the prism assembly can be directed toward the object being measured, so that the optical path of light from the object being measured in the prism assembly changes as the prism assembly rotates, thereby changing the focal length of the zoom lens and achieving the optical zoom effect of the camera module.

In a possible implementation, at least two of the multiple prisms have different optical materials. By flexibly adjusting the optical materials of different prisms, the Abbe numbers/refractive indices of different optical materials are matched to correct spherical aberration and other geometric aberrations caused by the structural changes of the prisms, and at the same time compensate for the chromatic aberration differences caused by zooming, thereby achieving aberration correction of the camera module.

In a possible implementation, when the prism assembly is in the first position, the zoom lens has a first clear aperture and a first aperture value, and when the prism assembly is in the second position, the zoom lens has a second clear aperture and a second aperture value, the first aperture value = first focal length/first clear aperture, the second aperture value = second focal length/second clear aperture, and the second aperture value is equal to the first aperture value. Since the prism assembly has a zoom effect, the first focal length ≠ the second focal length. In this embodiment, by adjusting the first clear aperture when the prism assembly is in the first position and the second clear aperture when it is in the second position to be different, different prisms have different clear apertures, so that light from the object side direction has different clear apertures in different prisms after entering different prisms, thereby achieving the first aperture value equal to the second aperture value, that is, achieving the effect of fixed aperture. The camera module of this embodiment can achieve the effect of constant aperture value while ensuring the zoom effect, that is, fixed aperture zoom.

In a possible implementation, each prism further includes a reflective surface, and the size of the reflective surface of the prism facing the object side when the prism assembly is in the first position is different from the size of the reflective surface of the prism facing the object side when the prism assembly is in the second position. By setting the sizes of the reflective surfaces of different prisms to be different, the size of the first light aperture when the prism assembly is in the first position is different from the size of the second light aperture when the prism assembly is in the second position, so that the zoom lens has different light apertures when the prism assembly is in the first position and the second position, which is conducive to achieving the first aperture value equal to the second aperture value, that is, achieving the effect of fixed aperture.

In a possible implementation, each prism further includes a reflective surface, and in each prism, light can enter the prism from the incident surface of the prism, be reflected by the reflective surface, and be emitted from the exit surface;

The prism assembly further includes a light shielding layer, which is disposed on at least one of the plurality of prisms and is located on at least one of the reflection surface, the incident surface, and the exit surface of the prism. By arranging the light shielding layer on the prism, the size of the first light aperture when the prism assembly is in the first position is different from the size of the second light aperture when the prism assembly is in the second position, so that the zoom lens has different light apertures when the prism assembly is in the first position and the second position, which is conducive to achieving the first aperture value equal to the second aperture value, that is, achieving the effect of a fixed aperture.

In a possible implementation, the incident surface of each prism is any one of a plane, an aspherical surface, and a high-order aspherical surface; the exit surface of each prism is any one of a plane, an aspherical surface, and a high-order aspherical surface.

In a possible implementation, each prism further includes a reflective surface. In each prism, light can enter the prism from the incident surface of the prism, be reflected by the reflective surface, and be emitted from the output surface. The reflective surfaces of two adjacent prisms are in contact with each other.

In a possible implementation, there are two prisms, which are respectively a first prism and a second prism. When the prism assembly is in a first position, the incident surface of the first prism faces the object side. When the prism assembly is in a second position, the incident surface of the second prism faces the object side.

In a possible implementation manner, the prism assembly rotates between the first position and the second position in an angle range of 0° to 180°.

An embodiment of the present application further provides a zoom lens, which includes a first driving member and a prism assembly as described above, wherein the first driving member is used to drive the prism assembly to rotate between a first position and a second position.

In a possible implementation, in the prism assembly, at least one prism further includes a non-light-transmitting surface, and the first driving member acts on the non-light-transmitting surface of the at least one prism to drive the prism assembly to rotate.

In a possible implementation, the first driving member is fixedly connected to a non-light-transmitting surface of at least one prism.

In a possible implementation, the first driving member includes a magnet and a coil, electromagnetic induction can occur between the magnet and the coil, and the magnet or the coil is fixedly connected to the non-light-transmitting surface of at least one prism.

In a possible embodiment, the zoom lens also includes a lens assembly and a second driving component, the light incident surface of the lens assembly faces the prism assembly, and the light exit surface of the lens assembly faces the image side. The second driving component is used to drive the lens assembly to move relative to the prism assembly along the optical axis direction of the lens assembly, which can further change the focal length of the zoom lens, so that the zoom range of the zoom lens is larger, and at the same time the imaging of the camera module is clearer, thereby facilitating the formation of a zoom camera module with better imaging quality.

An embodiment of the present application also provides a camera module, which includes an imaging component and a zoom lens as described above, wherein the light emitting surface of the zoom lens faces the imaging component.

An embodiment of the present application also provides a terminal device, including a shell and a camera module as described above, wherein the camera module is installed in the shell.

In a possible implementation, the first driving member drives the prism assembly to rotate about a first axis and a second axis, wherein the prism assembly rotates about the first axis between a first position and a second position, and the second axis is perpendicular to the first axis;

When the terminal device rotates around the first axis in a first direction by a first angle, the first driving member drives the prism assembly to rotate around the first axis in a direction opposite to the first direction by a first angle;

And/or, when the terminal device rotates around the second axis in the second direction by a second angle, the first driving member drives the prism assembly to rotate around the second axis in a direction opposite to the second direction by a second angle. When the terminal device uses the camera module to take pictures, and the terminal device shakes slightly, the first driving member drives the prism assembly to rotate around the first axis and the second axis, which can compensate for the field of view drift caused by the shaking of the terminal device and offset the image offset caused by the shaking, thereby ensuring that the camera module can still maintain stable imaging in a shaking environment, and further realizing the OIS (Optical Image Stabilization) anti-shake function of the camera module.

In a possible implementation, the first angle ranges from -1° to 1°.

In a possible implementation, the second angle ranges from -1° to 1°.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of a terminal device provided in the first embodiment of the present application;

FIG2 is a schematic diagram of the structure of a camera module in the terminal device shown in FIG1 ;

FIG3 is a schematic diagram of the structure of a zoom lens in the camera module shown in FIG2 ;

FIG4 is a schematic diagram of the structure of a prism assembly in the zoom lens shown in FIG3 ;

FIG5 is a schematic diagram of the three-dimensional structure of the prism assembly shown in FIG4;

FIG6 is a schematic diagram of the optical path when the prism assembly shown in FIG4 is in a first position and a second position;

FIG7 is a schematic structural diagram of a prism assembly in a zoom lens of a camera module according to a second embodiment of the present application;

FIG8 is a schematic structural diagram of a prism assembly in a zoom lens of a camera module according to a third embodiment of the present application;

FIG9 is a schematic diagram of the structure of a zoom lens in a camera module of the first example;

FIG10 is a simulation effect diagram of the prism assembly in the camera module shown in FIG9 when it is in the first position;

FIG11 is a relative illumination curve diagram of the camera module when the prism assembly shown in FIG10 is in the first position;

FIG12 is an MTF curve diagram of the camera module when the prism assembly shown in FIG10 is in the first position;

FIG13 is a simulation effect diagram of the camera module shown in FIG9 when the prism assembly is in the second position;

FIG14 is a relative illumination curve diagram of the camera module when the prism assembly shown in FIG13 is in the second position;

FIG. 15 is an MTF curve diagram of the camera module when the prism assembly shown in FIG. 13 is in the second position.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Referring to FIG. 1 and FIG. 2 , FIG. 1 is a schematic diagram of the structure of a terminal device 1 provided in the first embodiment of the present application, and FIG. 2 is a schematic diagram of the structure of a camera module 1000 in the terminal device 1 shown in FIG. 1 .

For ease of description, the length direction of the terminal device 1 shown in FIG1 is defined as the X-axis direction, the width direction is defined as the Y-axis direction, and the thickness direction is defined as the Z-axis direction. The terminal device 1 includes but is not limited to devices such as mobile phones, cameras, or tablets. It should be noted that the above examples of the terminal device 1 are only partial examples, and this application does not limit this. In this embodiment, the terminal device 1 is described by taking a mobile phone as an example.

The terminal device 1 includes a camera module 1000 and a housing 2000. The camera module 1000 is installed in the housing 2000 and is used for imaging.

Specifically, the camera module 1000 includes a zoom lens 1100 and an imaging component 1200, and the light-emitting surface of the zoom lens 1100 faces the imaging component 1200, that is, toward the object. Among them, the camera module 1000 has a first optical axis 1310 and a second optical axis 1320, and the first optical axis 1310 is perpendicular to the second optical axis 1320. In this embodiment, the first optical axis 1310 is in the Z-axis direction, and the second optical axis 1320 is in the Y-axis direction. Light from the object side direction can enter the zoom lens 1100 along the direction of the first optical axis 1310, and be emitted along the direction of the second optical axis 1320 and enter the imaging component 1200 for imaging. Exemplarily, the imaging component 1200 includes an image sensor (Sensor).

Please refer to FIG. 3 , which is a schematic diagram of the structure of the zoom lens 1100 in the camera module 1000 shown in FIG. 2 .

In this embodiment, the zoom lens 1100 includes a prism assembly 100, a lens assembly 200 and a first driving member (not shown in FIG. 3 ). The prism assembly 100 and the lens assembly 200 are arranged in sequence along the direction of the second optical axis 1320, that is, arranged in sequence along the width direction of the terminal device 1. Light from the object side direction can be incident along the direction of the first optical axis 1310 and enter the interior of the prism assembly 100, then be emitted along the direction of the second optical axis 1320 and pass through the lens assembly 200, and finally enter the imaging assembly 1200 for imaging. In other embodiments, the direction of the second optical axis 1320 can also be the X-axis direction, that is, the prism assembly 100 and the lens assembly 200 can be arranged in sequence along the length direction of the terminal device 1.

The first driving member can drive the prism assembly 100 to rotate around the first axis and the second axis relative to the lens assembly 200, and the first axis and the second axis are perpendicular to each other. Exemplarily, the first driving member includes but is not limited to a piezoelectric drive motor or a stepping servo motor. In this embodiment, the first axis is the X-axis direction and the second axis is the Z-axis direction. Among them, when the first driving member drives the prism assembly 100 to rotate around the first axis and relative to the lens assembly 200, the prism assembly 100 can rotate between the first position and the second position to change the optical focal length of the zoom lens 1100, thereby changing the focal length of the zoom lens 1100, and then realizing the optical zoom of the camera module 1000. Exemplarily, the first driving member can drive the prism assembly 100 to continuously move around the first axis and relative to the lens assembly 200 within an angle range of 0°~180°, that is, drive the prism assembly 100 to rotate around the first axis with a large stroke to realize the optical zoom of the camera module 1000. It should be noted that, in the present application, the initial position of the camera module 1000 is taken as 0°, and the rotation angles of the prism assembly 100 are all angles relative to the initial position.

When the terminal device 1 uses the camera module 1000 to take a photo and the terminal device 1 shakes slightly, the first driving member is used to drive the prism assembly 100 to rotate around the first axis and the second axis, which can compensate for the field of view drift caused by the shaking of the terminal device 1 and offset the image offset caused by the shaking, thereby ensuring that the camera module 1000 can still maintain stable imaging in a shaking environment, thereby realizing the OIS (Optical Image Stabilization) anti-shake function of the camera module 1000. Specifically, if the terminal device 1 rotates a first angle along a first direction around a first axis (i.e., the X-axis), the first driving member drives the prism assembly 100 to rotate a first angle around the first axis and in a direction opposite to the first direction, so as to perform corresponding compensation for the rotation direction around the first axis; if the terminal device 1 rotates a second angle around a second axis (i.e., the Z-axis) along a second direction, the first driving member drives the prism assembly 100 to rotate a second angle around the second axis and in a direction opposite to the second direction, so as to perform corresponding compensation for the rotation direction around the second axis; if the terminal device 1 simultaneously rotates a first angle around the first axis (i.e., the X-axis) along a first direction and a second angle around the second axis (i.e., the Z-axis) along a second direction, the first driving member drives the prism assembly 100 to rotate a first angle around the first axis and in a direction opposite to the first direction, and rotates a second angle around the second axis and in a direction opposite to the second direction, so as to perform corresponding compensation for the rotation directions around the first axis and around the second axis. Exemplarily, the first driving member can drive the prism assembly 100 to make continuous motion around the first axis and within the angle range of -1°~1° relative to the lens assembly 200, that is, the range of the first angle is -1°~1°, that is, the prism assembly 100 is driven to make a small rotation around the first axis. The first driving member can drive the prism assembly 100 to make continuous motion around the second axis and within the angle range of -1°~1° relative to the lens assembly 200, that is, the range of the second angle is -1°~1°, that is, the prism assembly 100 is driven to make a small rotation around the second axis, so as to realize the OIS optical image stabilization of the camera module 1000.

In this embodiment, the zoom lens 1100 further includes a second driving member. The second driving member is used to drive the lens assembly 200 to move relative to the prism assembly 100 along the optical axis direction of the lens assembly 200, that is, along the direction of the second optical axis 1320 (that is, along the Y-axis direction in this embodiment), so as to drive the lens assembly 200 to move closer to or away from the prism assembly 100, so that the zoom range of the zoom lens 1100 is larger, and the imaging of the camera module 1000 is clearer, thereby forming a zoom camera module 1000 with better imaging quality. Exemplarily, the second driving member is an auto focus (AF) motor.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of the structure of the prism assembly 100 in the zoom lens 1100 shown in FIG. 3 .

The prism assembly 100 includes a plurality of prisms 110. Each prism 110 includes an incident surface 111, a reflective surface 112, and an exit surface 113. Light enters the interior of the prism 110 from the incident surface 111, is reflected at the reflective surface 112, and exits from the exit surface 113. In this embodiment, the reflective surfaces 112 of two adjacent prisms 110 are bonded to form the prism assembly 100. Exemplarily, the reflective surfaces 112 of the plurality of prisms 110 are bonded by gluing to form the prism assembly 100.

Among them, the optical material of a single prism 110 can be selected from glass, plastic material or a material that is approximately transparent to visible light. For example, materials that are approximately transparent to visible light include liquid materials for making liquid lenses, magneto-variable materials or electro-variable materials for making adjustable optical lenses. The optical materials of multiple prisms 110 may be different. The embodiment of the present application adopts a method of assembling multiple prisms 110 to form a prism assembly 100. The optical materials of different prisms 110 can be flexibly adjusted to match the Abbe number/refractive index between different optical materials, so as to correct the spherical aberration and other geometric aberrations caused by the structural changes of the prism 110, and compensate for the chromatic aberration difference caused by zooming, thereby achieving aberration correction of the camera module 1000.

In addition, in the embodiment of the present application, the incident surfaces 111 and the exit surfaces 113 of different prisms 110 have their own independent curvatures, that is, the curvatures of the incident surfaces 111 of the multiple prisms 110 are different, and/or the curvatures of the exit surfaces 113 of the multiple prisms 110 are different, so as to achieve different focal lengths for the zoom lens 1100. Exemplarily, in each prism 110, the incident surface 111 can be any one of a plane, an aspheric surface, and a high-order aspheric surface, and the exit surface 113 can be any one of a plane, an aspheric surface, and a high-order aspheric surface. Exemplarily, the high-order aspheric surface is a high-order Q-Type aspheric surface.

In this embodiment, there are two prisms 110, and the two prisms 110 are respectively a first prism 110a and a second prism 110b. The first prism 110a includes an incident surface 111a, a reflecting surface 112a and an exit surface 113a, and the second prism 110b includes an incident surface 111b, a reflecting surface 112b and an exit surface 113b. The reflecting surface 112a of the first prism 110a is bonded to the reflecting surface 112b of the second prism 110b to assemble and form a prism assembly 100. Among them, the incident surface 111a of the first prism 110a, the exit surface 113a of the first prism 110a, the incident surface 111a of the second prism 110b and the exit surface 113b of the second prism 110b have independent curvatures. That is, the curvature of the incident surface 111a of the first prism 110a is different from the curvature of the incident surface 111a of the second prism 110b, and/or the curvature of the exit surface 113a of the first prism 110a is different from the curvature of the exit surface 113a of the second prism 110b.

Please refer to FIG. 5 , which is a schematic diagram of the three-dimensional structure of the prism assembly 100 shown in FIG. 4 .

At least one prism 110 further includes a non-light-transmitting surface 114. The first driving member drives the prism assembly 100 to rotate around the first axis and the second axis relative to the lens assembly 200 by acting on the non-light-transmitting surface 114 of the prism 110. In this embodiment, the first driving member is fixedly connected to the non-light-transmitting surface 114 of at least one prism 110, so that the first driving member acts on the prism assembly 100 in a contact manner.

In this embodiment, the first prism 110a includes a non-light-transmitting surface 114a, the second prism 110b includes a non-light-transmitting surface 114b, and the first driving member is fixedly connected to the non-light-transmitting surface 114a of the first prism 110a and the non-light-transmitting surface 114b of the second prism 110b, so that the first driving member drives the prism assembly 100 to rotate.

In other embodiments, the first driving member may also act on the prism assembly 100 in a non-contact manner. Exemplarily, the first driving member includes a magnet and a coil, and electromagnetic induction may occur between the magnet and the coil. The magnet or the coil is fixedly connected to the non-light-transmitting surface 114 of at least one prism 110 in the prism assembly 100, and the electromagnetic induction between the magnet and the coil is used to control the rotation of the prism assembly 100.

Refer to Fig. 6, which is a schematic diagram of the optical path when the prism assembly 100 shown in Fig. 4 is in the first position and the second position. Fig. 6 (a) shows the optical path when the prism assembly 100 is in the first position, and Fig. 6 (b) shows the optical path when the prism assembly 100 is in the second position.

Driven by the first driving member, the prism assembly 100 can rotate between a first position and a second position around the first axis relative to the lens assembly 200. It is understood that the first position or the second position can be used as the initial position of the prism assembly 100.

When the prism assembly 100 is in the first position, in one prism 110, the incident surface 111 faces the object side, and the exit surface 113 faces the image side, that is, toward the lens assembly 200. At this time, light from the object side direction can be incident from the incident surface 111 of one prism 110 and enter the interior of the prism 110, and then be emitted from the exit surface 113 after being reflected by the reflection surface 112, and the zoom lens 1100 has a first focal length.

When the prism assembly 100 is in the second position, in the other prism 110, the incident surface 111 faces the object side, and the exit surface 113 faces the image side, that is, toward the lens assembly 200. At this time, light from the object side direction can be incident from the incident surface 111 of the other prism 110 and enter the interior of the prism 110, and then be emitted from the exit surface 113 after being reflected by the reflection surface 112, and the zoom lens 1100 has a second focal length.

Since the curvatures of the incident surfaces 111 of different prisms 110 are different, and/or the curvatures of the exit surfaces 113 are different, when the prism assembly 100 is in the first position and the second position, the optical paths of the light rays originating from the object side direction after being incident on different prisms 110 are different, so that the second focal length of the zoom lens 1100 is different from the first focal length, so that when the prism assembly 100 rotates around the first axis and relative to the lens assembly 200, the zoom lens 1100 presents different focal lengths, thereby realizing the optical zoom of the camera module 1000.

Specifically, as shown in FIG. 6 (a), in this embodiment, when the prism assembly 100 is in the first position, the incident surface 111a of the first prism 110a faces the object side, and the exit surface 113a faces the lens assembly 200. Light from the object side is incident from the incident surface 111a of the first prism 110a and enters the interior of the first prism 110a. After being reflected by the reflection surface 112a, it is emitted from the exit surface 113a and enters the second lens assembly 200. At this time, the zoom lens 1100 has a first focal length. As shown in FIG. 6 (b), when the prism assembly 100 is in the second position, the incident surface 111b of the second prism 110b faces the object side, and the exit surface 113b faces the lens assembly 200. Light from the object side direction is incident from the incident surface 111b of the second prism 110b and enters the interior of the second prism 110b, and after being reflected by the reflection surface 112b, it is emitted from the exit surface 113b and enters the second lens assembly 200. At this time, the zoom lens 1100 has a second focal length.

Since the curvature of the incident surface 111a of the first prism 110a is different from the curvature of the incident surface 111a of the second prism 110b, and/or the curvature of the exit surface 113a of the first prism 110a is different from the curvature of the exit surface 113a of the second prism 110b, when the prism assembly 100 rotates between the first position and the second position under the drive of the first driving member, the optical path of the light originating from the object side direction after being incident on the first prism 110a is different from the optical path after being incident on the second prism 110b, so that the second focal length of the zoom lens 1100 is different from the first focal length, and the zoom lens 1100 presents a different focal length, thereby realizing the optical zoom of the camera module 1000.

Continuing to refer to FIG. 3 , the light incident surface of the lens assembly 200 faces the prism assembly 100, and the light exiting surface faces the image side, that is, toward the imaging assembly 1200. Specifically, the lens assembly 200 includes a plurality of optical lenses 210 and a filter, and the plurality of optical lenses 210 and the filter are sequentially arranged along the optical axis direction of the lens assembly 200, that is, along the direction of the second optical axis 1320 of the zoom lens 1100. The light emitted from the exit surface 113 of the prism 110 in the prism assembly 100 can sequentially enter the plurality of optical lenses 210, pass through the plurality of optical lenses 210 and the filter, reach the imaging assembly 1200, and finally form an image on the imaging assembly 1200. Among them, the surface of the optical lens 210 where the light emitted from the exit surface 113 of the prism 110 enters is the light incident surface of the lens assembly 200, and the surface of the filter facing the imaging assembly 1200 is the light exiting surface of the lens assembly 200, that is, the light exiting surface of the zoom lens 1100.

In the zoom lens 1100 provided in this embodiment, a plurality of prisms 110 are assembled to form a prism assembly 100, and the curvatures of the incident surfaces 111 and/or the exit surfaces 113 of different prisms 110 are flexibly changed, so that the optical paths of light in different prisms 110 are different. When the prism assembly 100 is driven to rotate by the first driving member, the incident surfaces 111 of different prisms 110 in the prism assembly 100 can be directed toward the object to be measured, so that the optical path of light from the object measurement direction in the prism assembly 100 changes as the prism assembly 100 rotates, thereby changing the focal length of the zoom lens 1100, and achieving the optical zoom effect of the camera module 1000. Compared with the existing method of driving at least two groups of lens assemblies 200 to move relatively along the direction of the second optical axis 1320 to achieve the zoom function of the camera module 1000, the embodiment of the present application can achieve the optical zoom effect of the camera module 1000 by only using the first driving member to drive the prism assembly 100 to rotate. At the same time, since there is no need to move multiple groups of lens assemblies 200 along the direction of the second optical axis 1320, it is also helpful to reduce the module size of the camera module 1000, thereby helping to reduce the space occupied by the camera module 1000 in the terminal device 1. In addition, by flexibly changing the optical materials of multiple prisms 110 in the prism assembly 100, spherical aberration and other geometric aberrations caused by the structural changes of the prism 110 can also be corrected, and the chromatic aberration difference caused by zooming can be compensated, thereby achieving aberration correction of the camera module 1000.

In addition, by using the second driving member to drive the lens assembly 200 to move relative to the prism assembly 100 along the optical axis direction of the lens assembly 200, that is, along the second optical axis 1320, the focal length of the zoom lens 1100 can be further changed, so that the zoom range of the zoom lens 1100 is larger, and at the same time the imaging of the camera module 1000 is clearer, thereby facilitating the formation of a zoom camera module 1000 with better imaging quality.

Refer to Fig. 7, which is a schematic diagram of the structure of the prism assembly 100 in the zoom lens 1100 of the camera module 1000 according to the second embodiment of the present application. In Fig. 7, the prism 110 of the prism assembly 100 is in an unbonded state.

The prism assembly 100 in the zoom lens 1100 of the camera module 1000 of the second embodiment is different from the prism assembly 100 of the first embodiment in that the light aperture of the first prism 110a and the light aperture of the second prism 110b are different among the multiple prisms 110 of the prism assembly 100 of the second embodiment. It should be understood that the light aperture of the prism 110 is limited by the minimum size of the incident surface 111, the reflection surface 112 and the exit surface 113 of the prism 110 that can pass light.

Specifically, in the second embodiment, the size of the reflective surface 112a of the first prism 110a is different from the size of the reflective surface 112b of the second prism 110b. When the prism assembly 100 is in the first position, the zoom lens 1100 of the camera module 1000 has a first clear aperture and a first aperture value. When the prism assembly 100 is in the second position, the zoom lens 1100 of the camera module 1000 has a second clear aperture and a second aperture value. The aperture stop of the zoom lens 1100 in the camera module 1000 of the second embodiment is arranged on the prism 110, and the size of the reflective surface 112a of the first prism 110a is different from the size of the reflective surface 112b of the second prism 110b, so as to realize that the size of the first clear aperture of the first prism 110a is different from the size of the second clear aperture of the second prism 110b, thereby realizing that the zoom lens 1100 has different clear apertures when the prism assembly 100 is in the first position and the second position.

The first aperture value = first focal length/first clear aperture, and the second aperture value = second focal length/second clear aperture. Since the prism assembly 100 has a zoom effect, the first focal length ≠ the second focal length. In this embodiment, the first clear aperture of the first prism 110a is adjusted to be different from the second clear aperture of the second prism 110b, so that different prisms 110 have different clear apertures, thereby achieving different clear apertures in different prisms 110 after the light from the object side direction enters different prisms 110, thereby achieving the first aperture value equal to the second aperture value, that is, achieving the effect of fixed aperture. The camera module 1000 of this embodiment can achieve the effect of constant aperture value while ensuring the zoom effect, that is, fixed aperture zoom.

Refer to Fig. 8, which is a schematic diagram of the structure of the prism assembly 100 in the zoom lens 1100 of the camera module 1000 of the third embodiment of the present application. The range of the arrows in Fig. 8 only represents the density of the light, and the bending direction of the arrows does not represent the actual path of the light.

The prism assembly 100 in the zoom lens 1100 of the camera module 1000 of the third embodiment is different from the prism assembly 100 of the first embodiment in that the clear aperture of the first prism 110a among the multiple prisms 110 of the prism assembly 100 of the third embodiment is different from the clear aperture of the second prism 110b.

In the third embodiment, the prism assembly 100 further includes a light shielding layer (not shown in FIG8 ). The light shielding layer is provided on at least one prism 110 and is located on at least one of the incident surface 111 , the reflective surface 112 and the emitting surface 113 of the prism 110 , so as to achieve different sizes of the light apertures of different prisms 110 .

Specifically, in the third embodiment, the shading layer is located on the incident surface 111a, the reflecting surface 112a and the exit surface 113a of the first prism 110a. Exemplarily, the material of the shading layer is an opaque material, such as ink. Specifically, the shading layer can be provided on the prism 110 by coating, blackening or silk-screening.

In other embodiments, a light shielding layer may be provided only on one or two of the incident surface 111a, the reflection surface 112a, and the exit surface 113a of the first prism 110a. In other embodiments, a light shielding layer may be provided only on at least one of the incident surface 111a, the reflection surface 112a, and the exit surface 113a of the second prism 110b. In other embodiments, a light shielding layer may be provided on both the first prism 110a and the second prism 110b, and the coverage areas of the light shielding layer in the first prism 110a and the second prism 110b are different, so as to achieve different sizes of the light aperture of the first prism 110a and the light aperture of the second prism 110b.

The camera module 1000 provided in this embodiment is provided with a light shielding layer on at least one of the incident surface 111, the reflective surface 112 and the exit surface 113 of the prism 110 to achieve different light apertures of different prisms 110, so that when the light from the object side direction enters different prisms 110, the zoom lens 1100 has different light apertures, thereby achieving that the camera module 1000 has a constant aperture value while having a zoom effect. It is understandable that in other embodiments, the amount of light from the object side direction entering different prisms 110 can also be changed according to demand, so that when the light from the object side direction enters different prisms 110, the zoom lens 1100 has different light apertures, thereby ensuring that the aperture value of the camera module 1000 is constant.

The camera module 1000 in the embodiment of the present application is described below in combination with specific examples and simulation effect experiments. Referring to Fig. 9, Fig. 9 is a schematic diagram of the structure of the zoom lens 1100 in the camera module 1000 of the first example.

In the camera module 1000 of the first example, there are two prisms 110 in the prism assembly 100 in the zoom lens 1100, namely the first prism 110a and the second prism 110b. The number of optical lenses 210 of the lens assembly 200 is six, and the first optical lens 210a, the second optical lens 210b, the third optical lens 210c, the fourth optical lens 210d, the fifth optical lens 210e and the sixth optical lens 210f are respectively included in the direction of the second optical axis 1320 and away from the prism assembly 100 (i.e., along the positive direction of the Y axis). Among them, the surface of the first optical lens 210a facing the exit surface 113 of the prism assembly 100 is recorded as P1S1, and the surface facing the image side (i.e., facing the imaging component) is recorded as P1S2. The surface of the second optical lens 210b facing the first optical lens 210a is recorded as P2S1, and the surface facing the image side is recorded as P2S2. The surface of the third optical lens 210c facing the second optical lens 210b is denoted as P3S1, and the surface facing the image side is denoted as P3S2. The surface of the fourth optical lens 210d facing the third optical lens 210c is denoted as P4S1, and the surface facing the image side is denoted as P4S2. The surface of the fifth optical lens 210e facing the fourth optical lens 210d is denoted as P5S1, and the surface facing the image side is denoted as P5S2. The surface of the sixth optical lens 210f facing the fifth optical lens 210e is denoted as P6S1, and the surface facing the image side is denoted as P6S2.

When the prism assembly 100 in the camera module 1000 is in the first position, light from the object side is incident from the incident surface 111a of the first prism 110a, and is emitted through the exit surface 113a, and then enters the first optical lens 210a, the second optical lens 210b, the third optical lens 210c, the fourth optical lens 210d, the fifth optical lens 210e and the sixth optical lens 210f in sequence along the second optical axis 1320, and finally forms an image on the imaging assembly. At this time, the zoom ratio of the camera module 1000 in this example is 1×.

When the prism assembly 100 is in the second position, light from the object side is incident from the incident surface 111b of the second prism 110b, exits through the exit surface 113b, and then enters the first optical lens 210a, the second optical lens 210b, the third optical lens 210c, the fourth optical lens 210d, the fifth optical lens 210e and the sixth optical lens 210f in sequence along the direction of the second optical axis 1320, and finally forms an image on the imaging assembly. At this time, the zoom ratio of the camera module 1000 in this example is 1.5×.

Specifically, the specific parameters of the camera module 1000 at different zoom ratios are shown in Table 1. The thickness of the camera module 1000 refers to the distance between the prism assembly 100 and the lens assembly 200 in the camera module 1000 in the direction of the second optical axis 1320, that is, the distance between the exit surface 113 of the prism 110 of the prism assembly 100 and the light incident surface of the lens assembly 200 in the direction of the second optical axis 1320. Specifically, when the prism assembly 100 is in the first position, the thickness of the camera module 1000 refers to the distance between the exit surface 113a of the first prism 110a and the surface of the first optical lens 210a facing the prism assembly 100 (i.e., P1S1) in the direction of the second optical axis 1320. When the prism assembly 100 is in the second position, the thickness of the camera module 1000 refers to the distance between the exit surface 113b of the second prism 110b and the surface of the first optical lens 210a facing the prism assembly 100 (ie, P1S1) in the direction of the second optical axis 1320.

Table 1 Specific parameters of the camera module 1000 at different zoom ratios

The curvature radius, cone coefficient and thickness of each optical lens in the lens assembly 200 are shown in Table 2. The surface of each optical lens satisfies the formula:

Among them, Z is the sagittal height at any position on the surface, r is the radial distance from the vertex of the aspheric surface shown in the expression to any position in polar coordinates, c is the inverse of the surface curvature radius, k is the surface cone coefficient, and A0~A8 represent the high-order coefficients. The high-order coefficients of the surfaces of various optical lenses are shown in Table 3.

Table 2 Curvature radius, cone coefficient and thickness of each optical lens in the lens assembly 200

Table 3 High-order coefficients of the surfaces of each optical lens in the lens assembly 200

The camera module 1000 of this example is used to conduct a simulation effect experiment. Referring to Figures 10 to 12, Figure 10 is a simulation effect diagram when the prism assembly 100 in the camera module 1000 shown in Figure 9 is in the first position, Figure 11 is a relative illumination curve diagram of the camera module 1000 when the prism assembly 100 shown in Figure 10 is in the first position, and Figure 12 is an MTF curve diagram of the camera module 1000 when the prism assembly 100 shown in Figure 10 is in the first position. Among them, the horizontal axis in Figure 11 represents the angle of the field of view, the unit is degree, and the vertical axis represents the relative illumination. The horizontal axis in Figure 12 represents the spatial frequency (Spatial Frequency), the unit is line pairs/mm, and the vertical axis represents the modulation transfer function (Modulation Transfer Function, MTF) value, that is, the modulus of the optical transfer function (Optical Transfer Function, OTF). Among them, each curve in Figure 12 represents the change of the modulation transfer function of different fields of view in the meridian and sagittal directions with the change of spatial frequency. The selection method of each field of view in Figure 12 is to evenly divide it from 0 to the maximum field of view, and the fields of view are 0 degrees (deg), 4.5 degrees (deg), 9 degrees (deg) and 13.50 degrees (deg).

Referring to Figures 13 to 15, Figure 13 is a simulation effect diagram when the prism assembly 100 in the camera module 1000 shown in Figure 9 is in the second position, Figure 14 is a relative illumination curve diagram of the camera module 1000 when the prism assembly 100 shown in Figure 13 is in the second position, and Figure 15 is an MTF curve diagram of the camera module 1000 when the prism assembly 100 shown in Figure 13 is in the second position. In Figure 14, the horizontal axis represents the angle of the field of view, the unit is degree, and the vertical axis represents the relative illumination. In Figure 15, the horizontal axis represents the spatial frequency, the unit is line pair/mm, and the vertical axis represents the modulation transfer function (MTF) value, that is, the modulus of the optical transfer function (OTF). In Figure 15, each curve represents the change of the modulation transfer function of different fields of view in the meridian and sagittal directions with the change of spatial frequency. The fields of view in FIG12 are selected by equally dividing the field of view from 0 to the maximum field of view, and the fields of view are 0 degrees (deg), 3.53 degrees (deg), 7.05 degrees (deg), and 10.58 degrees (deg).

It can be seen from Figures 10 and 13 that when the prism assembly 100 rotates from the first position to the second position, the focal length of the zoom lens changes, and the zoom factor of the camera module 1000 changes from 1× to 1.5×. It can be seen from Figures 11 and 14 that when the prism assembly 100 is in the first position and the second position, the relative illumination of the camera module 1000 can reach more than 90% when the field of view is maximum, and both have uniform relative illumination. It can be seen from Figures 12 and 15 that the MTF curves in Figures 12 and 15 are concentrated and close to the diffraction limit, indicating that the camera module 1000 can achieve relatively good imaging quality. In summary, judging from the experimental results of the simulation effect of the camera module 1000, the camera module 1000 provided in the example of the present application has excellent imaging quality and uniform illumination when the zoom factor changes.

What is disclosed above is only the preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims (20)

1. A prism assembly for a zoom lens, the prism assembly comprising a plurality of prisms, each prism comprising an entrance face and an exit face;

the prism assembly is rotatable between a first position and a second position;

when the prism assembly is positioned at the first position, in one prism, the incident surface faces to the object side, the emergent surface faces to the image side, and the zoom lens has a first focal length;

when the prism assembly is located at the second position, in the other prism, the incident surface faces to the object side, the emergent surface faces to the image side, and the zoom lens has a second focal length, and the second focal length is different from the first focal length.

2. The prism assembly according to claim 1, wherein the curvatures of the entrance faces of a plurality of the prisms are different and/or the curvatures of the exit faces of a plurality of the prisms are different.

3. The prism assembly according to claim 1, wherein the optical material of at least two of the plurality of prisms is different.

4. A prism assembly according to any one of claims 1 to 3, wherein the zoom lens has a first clear aperture and a first aperture value when the prism assembly is in the first position, and a second clear aperture and a second aperture value when the prism assembly is in the second position, the first aperture value = the first focal length/the first clear aperture, the second aperture value = the second focal length/the second clear aperture, and the second aperture value is equal to the first aperture value.

5. The prism assembly of claim 4, wherein each of the prisms further comprises a reflective surface, wherein a dimension of the reflective surface of the prism toward the object side when the prism assembly is in the first position is different from a dimension of the reflective surface of the prism toward the object side when the prism assembly is in the second position.

6. The prism assembly according to claim 4, wherein each of said prisms further comprises a reflective surface, wherein light is capable of entering said prism from an entrance surface of said prism, reflecting off said reflective surface, and exiting said exit surface;

The prism assembly further comprises a shading layer, wherein the shading layer is arranged on at least one prism of the prisms and is positioned on at least one surface of a reflecting surface, an incident surface and an emergent surface of the prism.

7. A prism assembly according to any one of claims 1 to 3, wherein the entrance face of each prism is any one of planar, aspherical and higher order aspherical; the emergent surface of each prism is any one of a plane, an aspheric surface and a higher aspheric surface.

8. A prism assembly according to any one of claims 1 to 3, wherein each prism further comprises a reflective surface, wherein light is able to enter the prism from the incident surface of the prism, reflect off the reflective surface, and exit the exit surface, and wherein the reflective surfaces of two adjacent prisms are in abutment.

9. A prism assembly according to any one of claims 1 to 3, wherein there are two prisms, a first prism and a second prism, respectively, the prism assembly being in the first position with the entrance face of the first prism facing the object side and the prism assembly being in the second position with the entrance face of the second prism facing the object side.

10. A prism assembly according to any one of claims 1 to 3, wherein the angle of rotation of the prism assembly between the first and second positions is in the range 0 ° to 180 °.

11. A zoom lens comprising a first drive member for driving rotation of the prism assembly between the first and second positions and a prism assembly as claimed in any one of claims 1 to 10.

12. The zoom lens of claim 11, wherein at least one of the prisms further comprises a non-light-passing surface, and the first driving member acts on the non-light-passing surface of at least one of the prisms to drive the prism assembly to rotate.

13. The zoom lens of claim 12, wherein the first driving member is fixedly connected to the non-light-passing surface of at least one of the prisms.

14. The zoom lens according to claim 12, wherein the first driving member comprises a magnet and a coil, electromagnetic induction is generated between the magnet and the coil, and the magnet or the coil is fixedly connected to the non-light-passing surface of at least one prism.

15. The zoom lens according to any one of claims 11 to 14, further comprising a lens assembly having a light incident surface facing the prism assembly and a light emergent surface facing the image side, and a second driving member for driving the lens assembly to move in an optical axis direction of the lens assembly relative to the prism assembly.

16. A camera module comprising an imaging assembly and a zoom lens according to any one of claims 11 to 15, wherein a light exit surface of the zoom lens faces the imaging assembly.

17. A terminal device comprising a housing and the camera module of claim 16, the camera module being mounted to the housing.

18. The terminal device of claim 17, wherein the first drive member drives the prism assembly to rotate about a first axis and a second axis, wherein the prism assembly rotates about the first axis between the first position and the second position, and wherein the second axis is perpendicular to the first axis;

when the terminal equipment rotates around the first shaft by a first angle along a first direction, the first driving piece drives the prism assembly to rotate around the first shaft by the first angle along a direction opposite to the first direction;

And/or when the terminal equipment rotates around the second shaft along a second direction by a second angle, the first driving piece drives the prism assembly to rotate around the second shaft along a direction opposite to the second direction by the second angle.

19. The terminal device of claim 18, wherein the first angle is in the range of-1 ° to 1 °.

20. The terminal device of claim 18, wherein the second angle is in the range of-1 ° to 1 °.

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