CN116203776B - Prism assembly, zoom lens, camera module and terminal equipment - Google Patents
Prism assembly, zoom lens, camera module and terminal equipment Download PDFInfo
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- CN116203776B CN116203776B CN202310491069.8A CN202310491069A CN116203776B CN 116203776 B CN116203776 B CN 116203776B CN 202310491069 A CN202310491069 A CN 202310491069A CN 116203776 B CN116203776 B CN 116203776B
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- prism assembly
- assembly
- zoom lens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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 realized only by utilizing the rotation mode of the prism assembly, and meanwhile, the module size of the camera module is reduced because 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
Technical Field
The application relates to the technical field of image pickup, in particular to a prism assembly, a zoom lens, an image pickup module and terminal equipment.
Background
In the camera module of the existing terminal equipment, at least two groups of lens assemblies need to move along the optical axis direction to realize the zooming function, so that the space occupation of the camera module in the length direction and the width direction is enlarged, and the camera module is not beneficial to being placed in terminal equipment products with increasingly tense inner space.
Disclosure of Invention
The application aims to provide a prism assembly, a zoom lens, a camera module and terminal equipment, and the zoom lens can achieve the zooming effect of the zoom lens by using the prism assembly, and meanwhile, the size of the camera module is reduced, so that the occupied space of the camera module in the terminal equipment is reduced.
The embodiment of the application provides a prism assembly, which is applied to a zoom lens, wherein the prism assembly 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.
In the prism assembly provided by the embodiment of the application, the incident surface orientation object measurement of different prisms in the prism assembly can be adjusted by rotating the prism assembly, so that the focal length of the zoom lens can be changed, and the optical zoom of the camera module can be realized. Compared with the existing mode of driving at least two groups of lens assemblies to relatively move along the optical axis direction of the lens assemblies so as to realize the zooming function of the camera module, the embodiment of the application can realize the optical zooming effect of the camera module only by utilizing the rotation mode of the prism assemblies, and meanwhile, the application is beneficial to reducing the module size of the camera module because the plurality of groups of lens assemblies do not need to be moved, thereby being beneficial to reducing the occupied space of the camera module in terminal equipment.
In addition, in the prism assembly provided by the embodiment of the application, the optical materials of a plurality of prisms in the prism assembly are flexibly changed, so that spherical aberration and other geometric aberration caused by the structural change of the prisms can be corrected, and meanwhile, the chromatic aberration difference caused by zooming is compensated, so that the aberration correction of the camera module is realized.
In one possible embodiment, the curvature of the entrance faces of the plurality of prisms is different and/or the curvature of the exit faces of the plurality of prisms is different. By flexibly changing the curvatures of the incident surfaces and/or the emergent surfaces of different prisms, the optical paths of light rays in the different prisms are different, when the prism assembly rotates, the incident surfaces of the different prisms in the prism assembly can be oriented to object measurement, so that the optical paths of light rays from the object measurement direction in the prism assembly are changed along with the rotation of the prism assembly, the focal length of the zoom lens is changed, and the optical zoom effect of the camera module is realized.
In one possible embodiment, the optical material of at least two prisms among the plurality of prisms is different. The abbe numbers/refractive indexes of different optical materials are matched by flexibly adjusting the optical materials of different prisms, so that spherical aberration and other geometric aberration caused by structural change of the prisms are corrected, and chromatic aberration difference caused by zooming is compensated, and aberration correction of the camera module is realized.
In one possible embodiment, 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. Because the prism assembly has the zooming effect, the first focal length is not equal to the second focal length, the first clear aperture is different from the second clear aperture when the prism assembly is at the second position by adjusting the first clear aperture when the prism assembly is at the first position, so that different prisms have different clear apertures, and light rays from the object side direction are emitted into different prisms and then have different clear apertures in different prisms, and the first aperture value is equal to the second aperture value, namely the aperture fixing effect is realized. The camera module of this embodiment can realize the invariable effect of aperture value when guaranteeing to have the zoom effect, can realize the fixed focus and zoom.
In one possible embodiment, each prism further comprises a reflective surface, the size of the reflective surface of the prism facing the object side when the prism assembly is in the first position being different from the size of the reflective surface of the prism facing the object side when the prism assembly is in the second position. The sizes of the reflecting surfaces of the different prisms are different, so that the size of the first clear aperture when the prism assembly is at the first position is different from the size of the second clear aperture when the prism assembly is at the second position, the zoom lens has different clear apertures when the prism assembly is at the first position and the second position, and the first aperture value is equal to the second aperture value, namely the fixed aperture effect is realized.
In one possible implementation, each prism further includes a reflecting surface, and in each prism, light can enter the prism from an incident surface of the prism, reflect off the reflecting surface, and exit from an exit surface;
the prism assembly further comprises a shading layer, wherein the shading layer is arranged on at least one prism in the plurality of prisms and is positioned on at least one surface of a reflecting surface, an incident surface and an emergent surface of the prism. Through set up the shielding layer on the prism to the size of the first clear aperture of realization prism subassembly when being in the first position is different with the size of the second clear aperture of prism subassembly when being in the second position, thereby realizes that the zoom lens has different clear apertures when the prism subassembly is in first position and second position, and then does benefit to the realization first aperture value and equals the second aperture value, realizes the effect of deciding the aperture promptly.
In one possible implementation, the incident surface of each prism is any one of a plane, an aspherical surface and a higher aspherical surface; the emergent surface of each prism is any one of a plane, an aspheric surface and a higher aspheric surface.
In one possible implementation, each prism further includes a reflecting surface, and in each prism, light can enter the prism from the incident surface of the prism, reflect through the reflecting surface, and exit from the exit surface, and the reflecting surfaces of two adjacent prisms are attached.
In one possible embodiment, there are two prisms, the two prisms being a first prism and a second prism, respectively, the prism assembly being positioned such that the entrance face of the first prism is oriented toward the object side when in the first position and the entrance face of the second prism is oriented toward the object side when in the second position.
In one possible embodiment, the angular extent of rotation of the prism assembly between the first and second positions is in the range of 0 ° to 180 °.
The embodiment of the application also provides a zoom lens, which comprises a first driving piece and the prism assembly, wherein the first driving piece is used for driving the prism assembly to rotate between a first position and a second position.
In one possible embodiment, the at least one prism further includes a non-light-passing surface, and the first driving member acts on the non-light-passing surface of the at least one prism to drive the prism assembly to rotate.
In one possible embodiment, the first drive element is fixedly connected to the non-light-passing surface of the at least one prism.
In one possible embodiment, the first driving member comprises a magnet and a coil, between which electromagnetic induction can occur, the magnet or the coil being fixedly connected to the non-light-passing surface of the at least one prism.
In one possible implementation manner, the zoom lens further comprises a lens assembly and a second driving piece, the light incident surface of the lens assembly faces the prism assembly, the light emergent surface of the lens assembly faces the image side, the second driving piece is used for driving the lens assembly to move along the optical axis direction of the lens assembly relative to the prism assembly, and therefore the focal length of the zoom lens can be further changed, the zoom range of the zoom lens is larger, meanwhile, imaging of the imaging module is clearer, and accordingly the imaging module with better imaging quality is formed.
The embodiment of the application also provides a camera module, which comprises an imaging assembly and the zoom lens, wherein the light-emitting surface of the zoom lens faces the imaging assembly.
The embodiment of the application also provides terminal equipment, which comprises a shell and the camera module, wherein the camera module is arranged on the shell.
In one possible embodiment, the first driver 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, the second axis being perpendicular to the first axis;
when the terminal equipment rotates around the first axis along a first direction by a first angle, the first driving piece drives the prism assembly to rotate around the first axis along a direction opposite to the first direction by the first angle;
and/or, when the terminal equipment rotates around the second shaft along the second direction by a second angle, the first driving piece drives the prism assembly to rotate around the second shaft along the direction opposite to the second direction by the second angle. When terminal equipment utilizes the camera module to shoot, and terminal equipment takes place small amplitude shake, utilize first driving piece drive prism subassembly to rotate around first axle and second axle, can compensate and bring visual field drift by terminal equipment shake, offset the image offset that the shake caused to guarantee that the camera module still can keep imaging stable in the shake environment, and then can realize the OIS (Optical Image Stabilization, optics anti-shake) function of camera module.
In one possible embodiment, the first angle ranges from-1 ° to 1 °.
In one possible embodiment, the second angle ranges from-1 ° to 1 °.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a terminal device according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a camera module in the terminal device shown in fig. 1;
FIG. 3 is a schematic view of a zoom lens in the camera module shown in FIG. 2;
FIG. 4 is a schematic view of a prism assembly of the zoom lens shown in FIG. 3;
FIG. 5 is a schematic perspective view of the prism assembly of FIG. 4;
FIG. 6 is a schematic view of the optical path of the prism assembly of FIG. 4 in a first position and a second position;
FIG. 7 is a schematic structural diagram of a prism assembly in a zoom lens of an image capturing module according to a second embodiment of the present application;
FIG. 8 is a schematic structural diagram of a prism assembly in a zoom lens of an image capturing module according to a third embodiment of the present application;
Fig. 9 is a schematic structural diagram of a zoom lens in the image capturing module of the first example;
FIG. 10 is a simulated effect diagram of the camera module of FIG. 9 with the prism assembly in a first position;
FIG. 11 is a graph of relative illuminance of the camera module with the prism assembly of FIG. 10 in a first position;
FIG. 12 is a graph of the MTF of the camera module with the prism assembly of FIG. 10 in a first position;
FIG. 13 is a simulated effect diagram of the prism assembly of the camera module of FIG. 9 in a second position;
FIG. 14 is a graph of relative illuminance of the camera module with the prism assembly of FIG. 13 in a second position;
fig. 15 is a MTF graph of the camera module with the prism assembly of fig. 13 in a second position.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a terminal device 1 according to a first embodiment of the present application, and fig. 2 is a schematic structural diagram of an image capturing module 1000 in the terminal device 1 shown in fig. 1.
For convenience of description, the length direction of the terminal device 1 shown in fig. 1 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, a mobile phone, a camera, a tablet, or the like. It should be noted that the above examples of the terminal device 1 are only partial examples, and the present application is not limited thereto. 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 mounted to the housing 2000 and is used for imaging.
Specifically, the camera module 1000 includes a zoom lens 1100 and an imaging assembly 1200, where a light exit surface of the zoom lens 1100 faces the imaging assembly 1200, i.e. faces an object. 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 rays originating from the object-side direction may enter the zoom lens 1100 in the direction of the first optical axis 1310 and exit in the direction of the second optical axis 1320 and enter the imaging assembly 1200 for imaging. Illustratively, the imaging assembly 1200 includes an image Sensor (Sensor).
Referring to fig. 3, fig. 3 is a schematic structural diagram of a zoom lens 1100 in the image capturing 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 sequentially arranged in the direction of the second optical axis 1320, i.e., in the width direction of the terminal device 1. Light rays originating from the object side direction may enter the prism assembly 100 along the first optical axis 1310, exit and pass through the lens assembly 200 along the second optical axis 1320, and finally enter the imaging assembly 1200 for imaging. In other embodiments, the direction of the second optical axis 1320 may also be the X-axis direction, i.e. the prism assembly 100 and the lens assembly 200 may be arranged in sequence along the length direction of the terminal device 1.
The first driving member may drive the prism assembly 100 to rotate about a first axis and a second axis, which are perpendicular to each other, and with respect to the lens assembly 200. Illustratively, the first driver includes, but is not limited to, a piezoelectric drive motor or a stepper servo motor, or the like. In this embodiment, the first axis is the X-axis direction, and the second axis is the Z-axis direction. 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 focal power of the zoom lens 1100, thereby changing the focal length of the zoom lens 1100 and further realizing the optical zoom of the camera module 1000. Illustratively, the first driving member may drive the prism assembly 100 to continuously move around the first axis within an angle range of 0 ° to 180 ° relative to the lens assembly 200, i.e. drive the prism assembly 100 to perform a large-stroke rotation around the first axis, so as to implement optical zooming of the camera module 1000. It should be noted that, in the present application, the initial position of the image capturing module 1000 is 0 °, and the rotation angles of the prism assembly 100 are all angles relative to the initial position.
When the terminal device 1 photographs by using the photographing module 1000 and the terminal device 1 shakes in a small amplitude, the prism assembly 100 is driven to rotate around the first axis and the second axis by using the first driving element, so that field of view drift caused by shake of the terminal device 1 can be compensated, and image offset caused by shake is counteracted, thereby ensuring that the photographing module 1000 can still keep stable imaging in a shake environment, and further realizing OIS (Optical Image Stabilization, optical anti-shake) function of the photographing module 1000. Specifically, if the terminal device 1 rotates around the first axis (i.e., the X-axis) by a first angle along the first direction, the first driving member drives the prism assembly 100 to rotate around the first axis by the first angle along the direction opposite to the first direction, so as to perform corresponding compensation on the rotation direction around the first axis; if the terminal device 1 rotates around the second axis (i.e. the Z axis) by a second angle along the second direction, the first driving member drives the prism assembly 100 to rotate around the second axis by the second angle along the direction opposite to the second direction, so as to perform corresponding compensation on the rotation direction around the second axis; if the terminal device 1 rotates simultaneously about the first axis (i.e., X-axis) by a first angle in a first direction and about the second axis (i.e., Z-axis) by a second angle in a second direction, the first driving member drives the prism assembly 100 to rotate about the first axis by the first angle in a direction opposite to the first direction and to rotate about the second axis by the second angle in a direction opposite to the second direction for respective compensation of the direction of rotation about the first axis and the direction of rotation about the second axis. The first driving member may drive the prism assembly 100 to continuously move around the first axis and within an angle range of-1 ° to 1 ° relative to the lens assembly 200, i.e., the first angle range is-1 ° to 1 °, i.e., the prism assembly 100 is driven to rotate around the first axis with a small stroke, and the first driving member may drive the prism assembly 100 to continuously move around the second axis and within an angle range of-1 ° to 1 ° relative to the lens assembly 200, i.e., the second angle range is-1 ° to 1 °, i.e., the prism assembly 100 is driven to rotate around the second axis with a small stroke, so as to implement OIS optical anti-shake of the camera module 1000.
In this embodiment, the zoom lens 1100 further includes a second driving member. The second driving member is configured to drive the lens assembly 200 to move along the optical axis direction of the lens assembly 200 relative to the prism assembly 100 (i.e. along the Y-axis direction in the present embodiment) along the second optical axis 1320, so as to drive the lens assembly 200 to move closer to or further away from the prism assembly 100, so that the zoom range of the zoom lens 1100 is larger, and meanwhile, the imaging of the imaging module 1000 is clearer, thereby forming a zoomed imaging module 1000 with better imaging quality. The second driving member is an Auto Focus (AF) motor, for example.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a 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 reflecting surface 112, and an exit surface 113, and light enters the prism 110 from the incident surface 111, is reflected at the reflecting surface 112, and exits from the exit surface 113. In this embodiment, the reflective surfaces 112 of two adjacent prisms 110 are bonded together to form the prism assembly 100. Illustratively, the reflective surfaces 112 of the plurality of prisms 110 are adhesively bonded to form the prism assembly 100.
The optical material of the single prism 110 may be selected from glass, plastic material, or a material approximately transparent to visible light. For example, materials that are approximately transparent to visible light include materials such as liquid materials that make up liquid lenses, magneto-rheological materials, or electro-rheological materials that make up tunable optical lenses. The optical materials of the plurality of prisms 110 may be different. The embodiment of the application adopts a mode of assembling a plurality of prisms 110 to form the prism assembly 100, and can flexibly adjust the optical materials of different prisms 110 to match abbe numbers/refractive indexes among different optical materials so as to correct spherical aberration and other geometric aberration caused by structural change of the prisms 110 and compensate chromatic aberration difference caused by zooming, thereby realizing aberration correction of the camera module 1000.
In addition, in the embodiment of the present application, the incident surface 111 and the emergent surface 113 of the different prisms 110 have respective curvatures, that is, the curvatures of the incident surfaces 111 of the plurality of prisms 110 are different, and/or the curvatures of the emergent surfaces 113 of the plurality of prisms 110 are different, so as to realize that the zoom lens 1100 has different focal lengths. Illustratively, in each prism 110, the incident surface 111 may be any one of a plane, an aspherical surface, and a higher order aspherical surface, and the exit surface 113 may be any one of a plane, an aspherical surface, and a higher order aspherical surface. Illustratively, the higher order aspheric surface is a higher order Q-Type aspheric surface Type.
In this embodiment, the number of prisms 110 is two, and the two prisms 110 are a first prism 110a and a second prism 110b, respectively. The first prism 110a includes an entrance surface 111a, a reflection surface 112a, and an exit surface 113a, and the second prism 110b includes an entrance surface 111b, a reflection surface 112b, and an exit surface 113b. The reflective surface 112a of the first prism 110a is bonded to the reflective surface 112b of the second prism 110b to assemble the prism assembly 100. 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 respective curvatures. That is, the curvature of the entrance surface 111a of the first prism 110a is different from the curvature of the entrance 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.
Referring to fig. 5 in combination, fig. 5 is a schematic perspective view of the prism assembly 100 shown in fig. 4.
The at least one prism 110 also includes a non-light-passing surface 114. The first driving member drives the prism assembly 100 to rotate about the first and second axes and relative to the lens assembly 200 by acting on the non-light-passing surface 114 of the prism 110. In this embodiment, the first driving member is fixedly connected to the non-light-passing surface 114 of at least one prism 110, so as to enable the first driving member to act on the prism assembly 100 in a contact manner.
In this embodiment, the first prism 110a includes a non-light-passing surface 114a, the second prism 110b includes a non-light-passing surface 114b, and the first driving member is fixedly connected to both the non-light-passing surface 114a of the first prism 110a and the non-light-passing surface 114b of the second prism 110b to realize 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. Illustratively, the first driving member includes a magnet and a coil between which electromagnetic induction may occur, the magnet or coil being fixedly coupled to the non-light-passing surface 114 of at least one prism 110 of the prism assembly 100, and the electromagnetic induction between the magnet and the coil being utilized to control the rotation of the prism assembly 100.
Referring to fig. 6, fig. 6 is a schematic view of the optical path of the prism assembly 100 of fig. 4 in a first position and a second position. Fig. 6 (a) shows a schematic optical path diagram of the prism assembly 100 in the first position, and fig. 6 (b) shows a schematic optical path diagram of the prism assembly 100 in the second position.
The prism assembly 100 is rotatable about a first axis and relative to the lens assembly 200 between a first position and a second position under the drive of the first drive member. It is understood that either the first position or the second position may be 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, i.e., faces the lens assembly 200. At this time, light rays from the object side direction may enter from the entrance surface 111 of one prism 110 and enter the inside of the prism 110, be reflected by the reflection surface 112, and then be emitted from the exit surface 113, and the zoom lens 1100 has a first focal length.
When the prism assembly 100 is in the second position, the incident surface 111 faces the object side, and the exit surface 113 faces the image side, i.e., the lens assembly 200, in the other prism 110. At this time, the light from the object side direction may enter from the entrance surface 111 of the other prism 110 and enter into the prism 110, be reflected by the reflection surface 112, and then be emitted from the exit surface 113, and the zoom lens 1100 has the second focal length.
Because the curvatures of the incident surfaces 111 and/or the emergent surfaces 113 of the different prisms 110 are different, when the prism assembly 100 is at the first position and the second position, the optical paths of the light beams from the object side direction incident on the different prisms 110 are different, so that the second focal length of the zoom lens 1100 is different from the first focal length, and 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 image capturing module 1000.
Specifically, as shown in fig. 6 (a), when the prism assembly 100 is at the first position in the present embodiment, the incident surface 111a of the first prism 110a faces the object side, the exit surface 113a faces the lens assembly 200, and the light from the object side enters the first prism 110a through the incident surface 111a of the first prism 110a, is reflected by the reflection surface 112a, and then exits from the exit surface 113a to enter 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, the exit surface 113b faces the lens assembly 200, and the incident light from the incident surface 111b of the second prism 110b from the object side direction enters the second prism 110b, is reflected by the reflection surface 112b, and then exits 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 emergent surface 113a of the first prism 110a is different from the curvature of the emergent surface 113a of the second prism 110b, when the prism assembly 100 rotates between the first position and the second position under the driving of the first driving member, the optical path of the light beam from the object side direction incident on the first prism 110a is different from the optical path 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 image capturing module 1000.
With continued reference to fig. 3, the light incident surface of the lens assembly 200 faces the prism assembly 100, and the light emergent surface faces the image side, i.e., the imaging assembly 1200. Specifically, the lens assembly 200 includes a plurality of optical lenses 210 and filters, and the plurality of optical lenses 210 and filters are sequentially arranged along the optical axis direction of the lens assembly 200, i.e., along the second optical axis 1320 of the zoom lens 1100. Light rays emitted from the exit surface 113 of the prism 110 in the prism assembly 100 may sequentially enter the plurality of optical lenses 210, pass through the plurality of optical lenses 210 and the optical filter, reach the imaging assembly 1200, and finally be imaged on the imaging assembly 1200. The surface of the optical lens 210, into which 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 optical filter facing the imaging assembly 1200 is the light emergent surface of the lens assembly 200, i.e. the light emergent surface of the zoom lens 1100.
In the zoom lens 1100 provided in the present embodiment, the prism assembly 100 is formed by assembling a plurality of prisms 110, and the curvatures of the incident surface 111 and/or the emergent surface 113 of different prisms 110 are flexibly changed, so that the optical paths of the light rays in different prisms 110 are different. When the first driving member is used to drive the prism assembly 100 to rotate, the incident surfaces 111 of different prisms 110 in the prism assembly 100 can be oriented to the object, so that the optical path of the light rays from the object measuring direction in the prism assembly 100 changes along with the rotation of the prism assembly 100, the focal length of the zoom lens 1100 is further changed, and the optical zoom effect of the camera module 1000 is realized. Compared with the prior art that the zoom function of the camera module 1000 is realized by driving at least two groups of lens assemblies 200 to move relatively along the direction of the second optical axis 1320, the embodiment of the application can realize the optical zoom effect of the camera module 1000 by only driving the prism assemblies 100 to rotate by using the first driving member, and meanwhile, the application is beneficial to reducing the module size of the camera module 1000 because the plurality of groups of lens assemblies 200 do not need to move along the direction of the second optical axis 1320, thereby being beneficial to reducing the occupied space of the camera module 1000 in the terminal equipment 1. In addition, by flexibly changing the optical materials of the plurality of prisms 110 in the prism assembly 100, spherical aberration and other geometric aberration caused by structural changes of the prisms 110 can be corrected, and meanwhile, chromatic aberration difference caused by zooming is compensated, so that aberration correction of the camera module 1000 is realized.
In addition, the lens assembly 200 is driven by the second driving member to move along the optical axis direction of the lens assembly 200, i.e. along the second optical axis 1320, relative to the prism assembly 100, so that the focal length of the zoom lens 1100 can be further changed, the zoom range of the zoom lens 1100 is larger, and meanwhile, the imaging of the imaging module 1000 is clearer, so that the imaging module 1000 with better imaging quality can be formed.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a prism assembly 100 in a zoom lens 1100 of an image capturing module 1000 according to a second embodiment of the present application. Wherein the prisms 110 of the prism assembly 100 in fig. 7 are in an unbonded state.
The prism assembly 100 in the zoom lens 1100 of the image capturing module 1000 according to the second embodiment is different from the prism assembly 100 according to the first embodiment in that the clear aperture of the first prism 110a and the clear aperture of the second prism 110b in the plurality of prisms 110 of the prism assembly 100 according to the second embodiment are different. It should be appreciated that the clear aperture of prism 110 is limited by the smallest dimension of prism 110 that can pass light through entrance face 111, reflecting face 112, and exit face 113.
Specifically, the size of the reflecting surface 112a of the first prism 110a is different from the size of the reflecting surface 112b of the second prism 110b in the second embodiment. When the prism assembly 100 is at 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 at the second position, the zoom lens 1100 of the image capturing module 1000 has a second clear aperture and a second aperture value. In the image capturing module 1000 of the second embodiment, the aperture stop of the zoom lens 1100 is disposed on the prism 110, and by designing the size of the reflecting surface 112a of the first prism 110a to be different from the size of the reflecting surface 112b of the second prism 110b, 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, so that the zoom lens 1100 has different clear apertures when the prism assembly 100 is in the first position and the second position.
And first aperture value = first focal length/first clear aperture, second aperture value = second focal length/second clear aperture. Since the prism assembly 100 has a zooming effect, the first focal length is not equal to 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, so that light rays from the object side direction are emitted into different prisms 110 and then have different clear apertures in different prisms 110, and the first aperture value is equal to the second aperture value, that is, the fixed aperture effect is achieved. The camera module 1000 of this embodiment can realize the effect of constant aperture value while guaranteeing the zoom effect, i.e. can realize the fixed-aperture zoom.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a prism assembly 100 in a zoom lens 1100 of an image capturing module 1000 according to a third embodiment of the present application. The range of the arrow in fig. 8 only indicates the density of the light, and the bending direction of the arrow does not indicate the actual path of the light.
The prism assembly 100 in the zoom lens 1100 of the image capturing module 1000 according to the third embodiment is different from the prism assembly 100 according to the first embodiment in that the clear aperture of the first prism 110a and the clear aperture of the second prism 110b in the plurality of prisms 110 of the prism assembly 100 according to the third embodiment are different.
In a third embodiment, the prism assembly 100 further includes a light shielding layer (not shown in fig. 8). The light shielding layer is disposed on at least one prism 110 and is located on at least one of the incident surface 111, the reflecting surface 112 and the emergent surface 113 of the prism 110, so as to realize different sizes of clear apertures of different prisms 110.
Specifically, in the third embodiment, the light shielding layer is located on the incident surface 111a, the reflecting surface 112a, and the exit surface 113a of the first prism 110 a. Illustratively, the material of the light-shielding layer is an opaque material, such as ink. The light shielding layer may be specifically formed by coating, blackening or silk-screening on the prism 110.
In other embodiments, the light shielding layer may be provided only on one or both of the incident surface 111a, the reflection surface 112a, and the exit surface 113a of the first prism 110 a. In other embodiments, the light shielding layer may be provided only in at least one of the incident surface 111a, the reflection surface 112a, and the exit surface 113a of the second prism 110 b. In other embodiments, a light shielding layer may be disposed in each of the first prism 110a and the second prism 110b, where the coverage area of the light shielding layer in the first prism 110a is different from that of the second prism 110b, so as to implement that the clear aperture of the first prism 110a and the clear aperture of the second prism 110b are different in size.
In the image capturing module 1000 provided in this embodiment, the light shielding layer is disposed on at least one of the incident surface 111, the reflecting surface 112 and the exit surface 113 of the prism 110, so as to realize different clear apertures of different prisms 110, thereby realizing that when light rays from the object side direction are incident into different prisms 110, the zoom lens 1100 has different clear apertures, and further realizing that the image capturing module 1000 has a zoom effect and a constant aperture value. It can be appreciated that in other embodiments, the light quantity of the light beam from the object side direction entering the different prisms 110 can be changed according to the requirement, so that the variable focal length lens 1100 has different clear apertures when the light beam from the object side direction enters the different prisms 110, and the constant aperture value of the camera module 1000 can be further ensured.
The camera module 1000 in the embodiment of the present application is described below in connection with specific examples and simulation effect experiments. Referring to fig. 9, fig. 9 is a schematic structural diagram of a zoom lens 1100 in the image capturing module 1000 according to the first example.
In the image capturing module 1000 of the first example, there are two prisms 110, namely, a first prism 110a and a second prism 110b, in the prism assembly 100 in the zoom lens 1100. The number of the optical lenses 210 of the lens assembly 200 is six, and the direction along the second optical axis 1320 and away from the prism assembly 100 (i.e., along the Y-axis positive direction) includes a first optical lens 210a, a second optical lens 210b, a third optical lens 210c, a fourth optical lens 210d, a fifth optical lens 210e, and a sixth optical lens 210f, respectively, in this order. Wherein, the surface of the first optical lens 210a facing the exit surface 113 of the prism assembly 100 is denoted as P1S1, and the surface facing the image side (i.e., facing the imaging assembly) is denoted as P1S2. The surface of the second optical lens 210b facing the first optical lens 210a is denoted as P2S1, and the surface facing the image side is denoted 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 image capturing module 1000 is at the first position, light from the object side direction enters the incident surface 111a of the first prism 110a, exits through the exit surface 113a, sequentially 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 along the second optical axis 1320, and finally forms an image on the image capturing module. At this time, the zoom magnification of the image capturing module 1000 in this example is 1×.
When the prism assembly 100 is at the second position, light rays from the object side enter the incident surface 111b of the second prism 110b, exit through the exit surface 113b, and enter 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 order along the direction of the second optical axis 1320, and finally are imaged on the imaging assembly. At this time, the zoom magnification of the image capturing module 1000 in this example is 1.5×.
Specifically, specific parameters of the camera module 1000 under different zoom magnifications are shown in table 1. The thickness of the image capturing module 1000 refers to a distance between the prism assembly 100 and the lens assembly 200 in the image capturing module 1000 in the direction of the second optical axis 1320, that is, a 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 at the first position, the thickness of the image capturing module 1000 refers to the distance between the exit surface 113a of the first prism 110a and the surface (i.e., P1S 1) of the first optical lens 210a facing the prism assembly 100 in the direction of the second optical axis 1320. When the prism assembly 100 is at the second position, the thickness of the image capturing module 1000 refers to the distance between the exit surface 113b of the second prism 110b and the surface (i.e., P1S 1) of the first optical lens 210a facing the prism assembly 100 in the direction of the second optical axis 1320.
Table 1 specific parameters of camera module 1000 at different zoom magnifications
The radius of curvature, conic coefficient, and thickness of each optical lens in lens assembly 200 are shown in table 2. The surface of each optical lens satisfies the formula:
wherein Z is the sagittal height of any position of the surface, r is the radial distance from the aspheric top point shown in the expression to any position in polar coordinates, c is the inverse of the radius of curvature of the surface, k is the surface cone coefficient, and A0-A8 represent the higher order coefficients. The higher order coefficients of the surfaces of the respective optical lenses are shown in table 3.
Table 2 radius of curvature, conic coefficient, and thickness of each optical lens in lens assembly 200
Table 3 higher order coefficients of the surfaces of the individual optical lenses in lens assembly 200
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The simulation effect experiment was performed using the camera module 1000 of this example. Referring to fig. 10 to 12, fig. 10 is a simulation effect diagram of the prism assembly 100 in the image capturing module 1000 shown in fig. 9 when the prism assembly 100 is in the first position, fig. 11 is a graph of relative illuminance of the image capturing module 1000 when the prism assembly 100 shown in fig. 10 is in the first position, and fig. 12 is a graph of MTF of the image capturing module 1000 when the prism assembly 100 shown in fig. 10 is in the first position. In fig. 11, the abscissa indicates the angle of the field of view, and the ordinate indicates the relative illuminance. The abscissa in fig. 12 represents the spatial frequency (Spatial Frequency) in line pairs/mm, and the ordinate represents the modulation transfer function (Modulation Transfer Function, MTF) value, i.e. the modulus of the optical transfer function (Optical Transfer Function, OTF). In fig. 12, each curve represents the change condition of the modulation transfer function of different fields of view in meridian and sagittal directions along with the change of the spatial frequency, and in fig. 12, each field of view is selected in a mode of equally dividing between 0 and the maximum field of view, and each field of view is respectively 0 degree (deg), 4.5 degrees (deg), 9 degrees (deg) and 13.50 degrees (deg).
Referring to fig. 13 to 15, fig. 13 is a simulation effect diagram of the prism assembly 100 in the image capturing module 1000 shown in fig. 9 when the prism assembly 100 is in the second position, fig. 14 is a graph of relative illuminance of the image capturing module 1000 when the prism assembly 100 shown in fig. 13 is in the second position, and fig. 15 is a graph of MTF of the image capturing module 1000 when the prism assembly 100 shown in fig. 13 is in the second position. In fig. 14, the abscissa indicates the angle of the field of view, and the ordinate indicates the relative illuminance. In fig. 15, the abscissa indicates spatial frequency in line pairs/mm, and the ordinate indicates modulation transfer function (Modulation Transfer Function, MTF) values, i.e., modes of optical transfer function (Optical Transfer Function, OTF). In fig. 15, each curve represents the variation of the modulation transfer function of different fields of view in meridian and sagittal directions with the spatial frequency. The fields of view in FIG. 12 are selected in such a way that they are equally divided between 0 and the maximum field of view, each field of view being 0 degrees (deg), 3.53 degrees (deg), 7.05 degrees (deg) and 10.58 degrees (deg), respectively.
As can be seen from fig. 10 and 13, when the prism assembly 100 is rotated from the first position to the second position, the focal length of the zoom lens changes, and the zoom magnification of the image capturing module 1000 changes from 1× to 1.5×. As can be seen from fig. 11 and 14, when the prism assembly 100 is in the first position and the second position, the relative illuminance of the camera module 1000 can reach more than 90% when the field of view is maximum, and the camera module has uniform relative illuminance. As can be seen from fig. 12 and 15, the MTF curves in fig. 12 and 15 are all concentrated and approach the diffraction limit, which indicates that the imaging module 1000 can achieve better imaging quality. In summary, from the experimental results of the simulation effect of the camera module 1000, the camera module 1000 provided by the example of the application has excellent imaging quality and uniform illuminance under the condition of variable zoom multiple.
The above disclosure is illustrative of the preferred embodiments of the present application and, of course, should not be taken as limiting the scope of the application, and those skilled in the art will recognize that all or part of the process for practicing the embodiments described herein can be practiced with equivalent arrangements which are within the purview of the present application.
Claims (20)
1. A prism assembly applied to a zoom lens, wherein the prism assembly comprises a plurality of prisms, each prism comprises an incident surface, a reflecting surface and an emergent surface, and light rays can enter the prism from the incident surface, reflect on the reflecting surface and emerge from the emergent surface in each prism;
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 a dimension of the light reflecting surface of the prism facing the object side when the prism assembly is in the first position is different from a dimension of the light reflecting surface of the prism facing the object side when the prism assembly is in the second position.
6. The prism assembly of claim 4, further comprising a light blocking layer disposed on at least one of the plurality of prisms and on at least one of a reflective surface, an entrance surface, and an exit 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 the reflective surfaces of adjacent two of the prisms are in registry.
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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