CN112748513A - Camera module, optical lens thereof, optical lens and manufacturing method - Google Patents
Camera module, optical lens thereof, optical lens and manufacturing method Download PDFInfo
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- CN112748513A CN112748513A CN201911037376.9A CN201911037376A CN112748513A CN 112748513 A CN112748513 A CN 112748513A CN 201911037376 A CN201911037376 A CN 201911037376A CN 112748513 A CN112748513 A CN 112748513A
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- imaging
- optical lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention provides a camera module, an optical lens and a manufacturing method thereof, wherein the optical lens comprises an imaging part and a non-imaging part, light emitted from the imaging part participates in imaging, the surface of at least one side of the imaging part is a free curved surface, and the non-imaging part is formed on the periphery of the imaging part.
Description
Technical Field
The invention relates to the field of camera modules, in particular to a camera module, an optical lens and a manufacturing method thereof.
Background
With the popularization of mobile electronic devices, a camera device becomes an essential part of an electronic terminal, and is used for meeting the requirements of users for shooting images. On the one hand, the requirements of users on the quality and the effect of photographing are higher and higher, and in order to meet the more and more extensive market demands, the development trend of the existing camera module is high pixel, small size and large aperture. On the other hand, the array camera module is inevitably applied to the electronic terminal on the basis that the single-lens camera module is difficult to meet the requirements of users on shooting quality and effect and diversification. The array camera module usually includes at least two camera modules, and the combination of the camera module of different functions is carried out according to the demand of shooing of difference, realizes having more excellent and elegant performance than single-lens camera shooting in the aspect of zoom shooting, big visual field shooting etc. becomes current and future popular application.
At present, the array camera module usually includes a telephoto camera module, a wide-angle camera module, a common module, and the like, for example, a common dual-camera module is composed of a telephoto module and a wide-angle module, a telephoto lens can be used as a main camera to take a picture, and a wide-angle lens has a large field of view and can be used for assisting in calculating depth information of the picture so as to perform subsequent image blurring processing. Be equipped with the array module of making a video recording on single electronic terminal, the increase of the module quantity of making a video recording and the joining of new function module of making a video recording have proposed higher requirement to the production technology, production efficiency and the equipment requirement of the module of making a video recording.
Because the field angle of the large wide-angle camera module is large, the inclination of light is large, so that the caused field curvature distortion is large, for example, the distortion of a lens with a field angle of 130 degrees is larger than 10%, when the conventional checkerboard shooting test is utilized, the large distortion of the wide-angle camera module in the process of testing the resolution causes that the resolution at four corners of a conventional CTF target is difficult to test, namely, the image shot by the wide-angle camera module is affected by the distortion, the peripheral test straight line is seriously bent, when the calculation is carried out by utilizing the algorithm of the conventional knife edge processing, the error is large, the integral resolving power of the wide-angle camera module is poor, the distortion correction is usually carried out by adopting software, on one hand, as the field angle of the wide-angle camera module is larger and larger, the distortion range of the software adjustable is limited, the distortion correction generated by the field angle of more than 110 degrees is difficult to meet, on the, software correction requires a very large amount of image data to process and the required hardware requirements are also very high.
Disclosure of Invention
One advantage of the present invention is to provide a camera module, an optical lens and a manufacturing method thereof, wherein the optical lens has a free-form surface to correct aberration and reduce distortion.
Another advantage of the present invention is to provide a camera module, an optical lens, and a manufacturing method thereof, in which the light of the optical lens is designed as a free-form surface through an effective area participating in imaging, so as to reduce the design difficulty and the processing difficulty of the free-form surface.
Another advantage of the present invention is to provide a camera module, an optical lens thereof, an optical lens and a manufacturing method thereof, wherein the shape of the outer periphery of the optical lens is adapted to the shape of the inner wall of a lens barrel, so as to reduce the assembly difficulty of the optical lens, and enable the optical lens to be assembled to an existing optical lens.
Another advantage of the present invention is to provide a camera module, an optical lens thereof, an optical lens and a manufacturing method thereof, wherein the optical lens includes an imaging portion, a transition portion and a fitting portion, and the transition portion connects the imaging portion and the fitting portion and adapts to shapes of the fitting portion and the imaging portion to avoid design restrictions on the imaging portion and the fitting portion.
Another advantage of the present invention is to provide a camera module, an optical lens and a manufacturing method thereof, in which the imaging portion of the optical lens is designed to have a free-form surface, so that distortion of the wide-angle lens can be reduced and aberration can be corrected.
Another advantage of the present invention is to provide a camera module, an optical lens thereof, an optical lens and a manufacturing method thereof, wherein the optical lens includes a non-imaging portion formed at an outer periphery of the imaging portion, and the non-imaging portion is adapted to a shape of an existing lens barrel to reduce difficulty in assembling the optical lens and the imaging portion thereof.
Another advantage of the present invention is to provide a camera module, an optical lens, and a manufacturing method thereof, which can block light in the non-imaging portion to prevent light from passing through the non-imaging portion and interfering with imaging.
Another advantage of the present invention is to provide a camera module, an optical lens, and a manufacturing method thereof, in which the shape of the imaging portion is adapted to the shape of a photosensitive element of the optical lens, so as to improve the utilization rate of the photosensitive element.
Another advantage of the present invention is to provide a camera module, an optical lens and a manufacturing method thereof, which can eliminate the height difference between the transition portion and the imaging portion to reduce the adverse effect caused by the height difference.
Another advantage of the present invention is to provide a camera module, an optical lens, and a manufacturing method thereof, in which a light blocking process is performed on a fault plane between the transition portion and the imaging portion to reduce the effect of light refraction and reflection caused by a high fault.
Another advantage of the present invention is to provide a camera module, an optical lens and a manufacturing method thereof, in which the optical lens is assembled to a large wide-angle lens, and the free-form surface reduces the inclination angle of the light to reduce distortion and correct aberration.
Another advantage of the present invention is to provide a camera module, an optical lens and a manufacturing method thereof, in which distortion is reduced by the optical lens with a free-form surface, the resolving power of the large wide-angle lens is improved, and the dependence on distortion correction software is reduced.
Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.
In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved by an optical lens of the present invention adapted to be assembled to a lens barrel, comprising:
the imaging part is used for imaging the light rays emitted from the imaging part, wherein the surface of at least one side of the imaging part is a free-form surface; and
a non-image forming portion formed at an outer periphery of the image forming portion.
According to an embodiment of the present invention, the non-imaging portion includes a fitting portion and a transition portion, the transition portion being formed at an outer periphery of the imaging portion, the fitting portion being formed at an outer periphery of the transition portion, the transition portion connecting the imaging portion and the fitting portion.
According to an embodiment of the present invention, a shape of the fitting portion is adapted to a shape of an inner wall of the lens barrel to which the optical lens is fitted, so that the optical lens is fitted to the lens barrel.
According to an embodiment of the invention, the transition portion complements a shape of the imaging portion to fit with the fitting portion.
According to one embodiment of the present invention, a surface of at least one side of the non-imaging portion is light-blocking treated to block light from passing therethrough.
According to an embodiment of the present invention, the transition portion and the imaging portion have a height difference extending from a top end of a transition surface of the transition portion to a first surface of the imaging portion to form a fault plane.
According to one embodiment of the invention, the fault plane is light-blocking treated to prevent light rays from being refracted by the fault plane.
According to an embodiment of the invention, a transition surface of the transition portion and a first surface of the imaging portion are connected.
According to an embodiment of the present invention, the shape of the imaging part in the XY plane is symmetrical about the X axis.
According to an embodiment of the present invention, a shape of the imaging part in the XY plane is symmetrical about the Y axis.
According to another aspect of the present invention, the present invention further provides an optical lens, comprising:
a lens barrel having an assembly space and an inner wall defining the assembly space; and
at least one optical lens mounted to the mounting space, wherein the optical lens includes:
the imaging part is used for light to penetrate and participate in imaging, and the surface of at least one side of the imaging part is a free-form surface; and
a non-imaging part formed on the periphery of the imaging part, wherein the periphery of the non-imaging part is matched with the inner wall of the lens barrel in shape.
According to an embodiment of the present invention, the optical lens is a large wide-angle lens, and the optical lens is mounted to the optical lens, and light passes through the imaging portion of the optical lens to reduce a tilt angle of the light.
According to an embodiment of the present invention, the non-imaging portion includes a fitting portion and a transition portion, the transition portion being formed at an outer periphery of the imaging portion, the fitting portion being formed at an outer periphery of the transition portion, the transition portion connecting the imaging portion and the fitting portion.
According to an embodiment of the present invention, a shape of the fitting portion and a shape of the inner wall of the lens barrel to which it is fitted are adapted so that the optical lens is fitted to the fitting space of the lens barrel.
According to an embodiment of the invention, the transition portion complements a shape of the imaging portion to fit with the fitting portion.
According to one embodiment of the present invention, a surface of at least one side of the non-imaging portion is light-blocking treated to block light from passing therethrough.
According to an embodiment of the present invention, the transition portion and the imaging portion have a height difference extending from a top end of a transition surface of the transition portion to a first surface of the imaging portion to form a fault plane.
According to one embodiment of the invention, the fault plane is light-blocking treated to prevent light rays from being refracted by the fault plane.
According to an embodiment of the invention, a transition surface of the transition portion and a first surface of the imaging portion are connected.
According to an embodiment of the present invention, the shape of the imaging part in the XY plane is symmetrical about the X axis.
According to an embodiment of the present invention, a shape of the imaging part in the XY plane is symmetrical about the Y axis.
According to another aspect of the present invention, the present invention further provides a camera module, including:
an optical lens, the optical lens comprising:
a lens barrel having an assembly space and an inner wall defining the assembly space; and
at least one optical lens mounted to the mounting space, wherein the optical lens includes:
the imaging part is used for light to penetrate and participate in imaging, and the surface of at least one side of the imaging part is a free-form surface; and
a non-imaging part formed on the periphery of the imaging part, wherein the periphery of the non-imaging part is matched with the shape of the inner wall of the lens barrel; and
and the photosensitive element is arranged on the emergent side of the optical lens, and the light beam emitted from the imaging part forms an effective imaging area on the photosensitive element.
According to one embodiment of the present invention, the photosensitive element has a photosensitive area, and the effective imaging area completely covers the photosensitive area.
According to one embodiment of the invention, the shape of the effective imaging area is adapted to the shape of the photosensitive area.
According to another aspect of the present invention, there is further provided a manufacturing method for manufacturing an optical lens, comprising the steps of:
(A) designing the surface of at least one side of an imaging part as a free-form surface; and
(B) a non-image forming portion is provided on an outer periphery of the image forming portion.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
supplementing a transition part to the periphery of the imaging part; and
an assembly portion is disposed about the periphery of the transition portion.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
the shape of the assembling portion is designed to be adapted to an inner wall of a lens barrel.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
and light blocking processing is performed on the surface of at least one side of the non-imaging part.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
and performing light blocking treatment on a fault plane caused by the height difference between the transition part and the imaging part.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
the transition portion is face-shaped to eliminate a height difference between the transition portion and the imaging portion.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
Fig. 1A is a schematic diagram of an optical lens according to a preferred embodiment of the invention.
FIG. 1B is a diagram illustrating an imaging area of an optical lens according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of an optical lens according to a preferred embodiment of the invention.
Fig. 3A is a schematic diagram of a camera module according to a preferred embodiment of the invention.
Fig. 3B is a schematic diagram of a camera module according to a preferred embodiment of the invention.
Fig. 4A is a schematic diagram of an optical lens processed by light blocking according to a preferred embodiment of the invention.
FIG. 4B is another schematic diagram of an optical lens with light blocking treatment according to a preferred embodiment of the invention
FIG. 5 is a schematic diagram of an optical lens according to a preferred embodiment of the invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is to be understood that the terms "a" and "an" are to be interpreted as meaning "at least one" or "one or more," i.e., that a single element may be present in a single embodiment, while in other embodiments the element may be present in a plurality, and the terms "a" and "an" are not to be interpreted as limiting the number.
Referring to fig. 1A to 5, the present invention provides an optical lens 10, wherein the optical lens 10 includes an imaging portion 11 and a non-imaging portion 12, and the non-imaging portion 12 is formed on an outer periphery of the imaging portion 11. The imaging part 11 allows light to pass through and participate in imaging. The imaging part 11 is an effective area of the optical lens 10 through which light can pass to participate in imaging.
At least one side surface of the imaging portion 11 is a free-form surface. The surface of the imaging part 11 is designed into a free curved surface, and a progressive multi-focus surface is processed on at least one side surface of the imaging part 11.
The imaging portion 11 having a free-form surface is irregular and asymmetrical, having multiple axes of symmetry.
When the optical lens 100 is optically designed, the free-form surface design is performed only on the effective region through which light is transmitted to form an image, that is, the surface of the imaging portion 11, and the surface of the non-imaging portion 12 is not a free-form surface. That is, the portion of the optical lens 10 through which light participating in imaging passes is a free-form surface. The other area of the optical lens 10 forms the non-imaging portion 12 so that the imaging portion 11 can be suitably assembled.
Referring to fig. 2, the non-imaging part 12 includes a fitting part 121 and a transition part 122, and the transition part 122 connects the fitting part 121 and the imaging part 11. The transition portion 122 is formed at the outer circumference of the image forming portion 11, and the fitting portion 121 is formed at the outer circumference of the transition portion 122. The fitting part 121 is shaped to be fitted. The transition portion 122 is formed between the imaging portion 11 and the mounting portion 121 to complement the surface shape of the imaging portion 11, and transitions from the imaging portion 11 to the mounting portion 121 to form the optical lens 10.
Referring to fig. 3A and 3B, the present invention further provides a camera module, which includes an optical lens 100, wherein the optical lens 100 includes a lens barrel 20, and the optical lens 10 is assembled to the lens barrel 20. The non-imaging portion 12 is adapted to be fitted to the lens barrel 20 such that the optical lens 10 is fitted to the lens barrel 20 to overcome the difficulty in fitting the imaging portion 11 having a free-form surface.
The lens barrel 20 has an inner wall 21 and a fitting space 22, and the inner wall 21 surrounds and defines the fitting space 22. The optical lens 10 is fitted to the fitting space 22. The lens barrel 20 further has a light inlet 23 and a light outlet 24, and light enters the assembly space 22 through the light inlet 23, passes through the optical lens 10, and exits from the light outlet 24.
The light enters the lens barrel 20 from the light inlet 23, passes through the imaging part 11 of the optical lens 10, and then participates in imaging. That is, the light beam emitted from the imaging section 11 is an effective light beam that participates in imaging. The transition portion 122 is formed on the periphery of the imaging portion 11, and light can also pass through the transition portion 122. The light beam emitted from the transition part 122 is an ineffective light beam not participating in imaging
The fitting portion 121 is formed at the outer circumference of the transition portion 122. The shape of the fitting portion 121 is adapted to the shape of the lens barrel 20 so that the fitting portion 121 can be fitted into the fitting space 22 of the lens barrel 20, and the optical lens 10 is fitted into the fitting space 22.
The assembly portion 121 and the lens barrel 20 are rotators, and even if the imaging portion 11 is rotationally asymmetric, the assembly portion 121 and the lens barrel 20 can be adapted such that the optical lens 10 is assembled to the lens barrel 20, the imaging portion 11 can be assembled to the assembly space 22, and light enters the lens barrel 20 through the light inlet 23 to participate in imaging through the imaging portion 11
The shape of the non-imaging part 12 is adapted to the shape of the inner wall 21 of the lens barrel 20 so that the optical lens 10 is fitted in the fitting space 22.
The surface of the imaging part 11 is a free-form surface, and the surface shape of the mounting part 121 can be adapted to the existing lens mounting process, so that the optical lens 10 can be mounted on the existing lens barrel, and the applicability and mounting convenience of the optical lens 10 can be improved. The inner wall 21 of the lens barrel 20 is implemented to be stepped, the optical lens 10 may be inserted between the inner walls 21 of the lens barrel 20, and the fitting part 121 is leaned against a stepped area of the inner wall 21, so that the optical lens 10 is fitted to the fitting space 22.
The mounting portion 121 has at least one resting surface 1211. When the optical lens 10 is assembled in the assembling space 22 of the lens barrel 20, the assembling portion 121 leans against the inner wall 21 of the lens barrel 20.
The imaging part 11 of the optical lens 10 has a first surface 11 and a second surface 12, and one or both of the first surface 11 and the second surface 12 are free-form surfaces.
The transition portion 122 has a transition surface 1221, and the transition surface 1221 extends from the resting surface 121 of the fitting portion 121 to the first surface 11 of the imaging portion 11. The transition surface 1221 complements the face shape of the first surface 111 of the imaging part 11 to connect the imaging part 11 and the fitting part 122.
It is worth mentioning that the first surface 11 and the second surface 12 may be replaced by each other. The first surface 11 and the second surface 12 are directed to one of the surfaces on both sides of the imaging part 11, not specifically.
The surface of the imaging part 11 is designed as a free curved surface, the fitting part 121 is shaped to fit the shape of the inner wall 21 of the lens barrel 20, the transition part 122 is provided to connect the imaging part 11 and the fitting part 121, and the surface shape of the imaging part 11 is supplemented to fit the imaging part 11 and the fitting part 121.
The surface of the imaging part 11 is designed to be a free-form surface, and the non-imaging part 12 formed on the periphery of the imaging part 11 is a non-free-form surface, so that the assembly is facilitated, the optical lens 10 can be assembled to the lens barrel 20, and the requirements on the lens barrel 20 are low, so that the optical lens 10 can be applied to an existing lens barrel. The provision of the non-imaging portion 12 reduces the difficulty of assembling the imaging portion 11 with a free-form surface, and enables the imaging portion 11 with a free-form surface to be assembled in the assembly space 22 of the lens barrel 20, improving the usability of the optical lens 10.
Further, the fitting portion 121 is configured to adapt to the shape of the inner wall 21 of the lens barrel 20 for fitting, the imaging portion 11 is designed as a free-form surface, the connection between the fitting portion 121 and the imaging portion 11 can be achieved by the transition portion 122, and the transition portion 122 complements the shape of the imaging portion 11, so that the fitting portion 121, the transition portion 122 and the imaging portion 11 are connected to form the optical lens 10, which is adapted to be fitted to the lens barrel 20. The assembling portion 121 is assembled without affecting the light to be transmitted through the imaging portion 11 to participate in imaging.
For example, the fitting part 121 may be implemented in a circular ring shape, have a regular shape, and be adapted to fit the shape of the inner wall 21 of the lens barrel 20, and the fitting part 121 may also be implemented in a circular ring shape having protrusions and grooves, or in other shapes that fit the shape of the inner wall 21 of the lens barrel 20. The design of the assembling part 121 can refer to the design of the existing non-free-form surface lens, so that the assembling of the optical lens 10 can refer to the assembling mode of the existing non-free-form surface lens, the assembling method is suitable for the existing lens assembling hole, and the optical lens is assembled in the existing optical lens.
The mounting portion 12 may or may not be rotationally symmetrical. When the inner wall 21 of the lens barrel 20 is rotationally symmetrical, the shape of the fitting part 12 may be implemented to be rotationally symmetrical.
By providing the transition portion 122, the design of the surface shape of the imaging portion 11 is not limited, and the connection with the fitting portion 122 can be realized by configuring the transition portion 122 with different designs for the imaging portions 11 with different designs. The shape of the fitting portion 122 is adapted to the inner wall 21 of the lens barrel 20, and the shape of the outer periphery of the transition portion 122 is adapted to the fitting portion 122. The surface design of the imaging part 11 is determined according to optical requirements, the shape of the assembling part 122 is determined according to assembling requirements, and the shapes of the inner periphery and the outer periphery of the transition part 122 are respectively adapted to the shapes of the imaging part 11 and the assembling part 122, so that the design of the imaging part 11 and the assembling part 122 is not interfered with or limited by each other.
In one example of the present invention, the optical lens 100 may be implemented as a large wide-angle lens having a large field of view range but a large inclination of light rays causing a large field curvature distortion, and the optical lens 10 having a free curved surface is mounted on the large wide-angle lens to reduce the inclination of light rays and alleviate the distortion of the large field of view. Taking a lens with an angle of view of 130 ° as an example, the optical lens 10 having a free-form surface is arranged, and distortion can be reduced from 10% or more to 2% or less to correct aberration. The large wide-angle lens with reduced distortion has improved image resolving capability, reduces or eliminates dependence on distortion correction software, and further can reduce the problem of setting and avoiding loss of pixels in the distortion correction of the software. That is, by providing the optical lens 100 with the optical lens 10 having a free-form surface, the optical lens 100 can reduce distortion by the design of its own optical system.
When processing an image captured by the optical lens 100 having the optical lens 10, the distortion to be corrected by software is reduced, the amount of data to be corrected is reduced, and the loss of the image during processing is reduced.
The lens that disposes in can to current camera module is replaced, will have the free form optical lens 10 assembles to current camera module in to reduce or eliminate the aberration, reduce the distortion, and reduce the data processing volume that the software corrected, reduce the image loss.
It is worth mentioning that when assembling the lenses of the existing camera module, the optical axes of the lenses need to be ensured to be coaxial. When the optical lens 10 is optically designed, the optical axis is ensured to be unchanged, so that the optical axis of the optical lens 10 and other lenses of the existing optical lens are kept coaxial during assembly.
The present invention provides the optical lens 100, which includes the optical lens 10 and other lenses, and when the optical lens 10 is assembled, the optical axis of the optical lens 10 and the optical axis of the other lenses are made coaxial, and the optical lens 10 and the other lenses can be attached.
When the optical lens 10 having a free-form surface is assembled to the optical lens 100, the optical lens 10 having a free-form surface may be assembled between other lenses, as shown in fig. 3A, or may be assembled after being assembled to another lens, and then as the last lens through which light passes, as shown in fig. 3B, the inclination angle of the light is adjusted to reduce the distortion of the optical lens 100.
Because optical lens 10 is the last lens that sees through, when light passes through, can rectify the inclination that the light produced when other lenses in front permeate through, realize the light correction, avoid when light sees through optical lens 10, produce big inclination once more when seeing through other lenses.
The optical lens 10 can be designed to have a surface shape and a diopter so as to be matched with other lenses of the optical lens 100, so that the optical lens 100 is small in distortion and compact in structure.
Referring to fig. 1B, the optical lens 100 further includes a photosensitive element 30, the photosensitive element 30 is disposed on the emitting side of the optical lens 10, and the light passes through the optical lens 10, is emitted to the photosensitive element 30, and is imaged on the photosensitive element 30.
The portion of the light beam that is transmitted to form an image on the photosensitive element 30 is the image forming portion 11 of the optical lens 10. That is, in the optical lens 10, a portion where the transmitted light can be imaged on the photosensitive element 30 is an effective area for imaging, that is, the imaging portion 11.
Only the portion of the optical lens 10 where light rays can be imaged on the photosensitive element 30 is designed to be free-form to correct aberrations and reduce distortion. The shape of the image forming portion 11 is adapted to the shape of the photosensitive element 30.
That is, when the optical lens 10 is designed, a portion through which light is transmitted to participate in imaging is free-form-designed to form the imaging portion 11, aberration is corrected, distortion is reduced, the fitting portion 121, which forms a shape of a solid of revolution at the outer circumference of the optical lens 10, is adapted to fit the optical lens 10 to the lens barrel 20, and the transition portion 122 is formed between the imaging portion 11 and the fitting portion 121 to transition from the imaging portion 11 to the fitting portion 121. The optical lens 10 can be designed to achieve the effects of aberration correction and distortion reduction for imaging, and can also be assembled to the lens barrel 20 and other existing optical lenses, thereby reducing the assembly difficulty and improving the applicability of the optical lens 10.
In addition, the free-form surface design is only carried out on the part of the light which is transmitted and participates in imaging, the occupied area of the free-form surface on the optical lens 10 is reduced, and the difficulty of the free-form surface design and processing is reduced.
The photosensitive element 30 has a photosensitive area 301, and light is imaged in the imaging area 301.
The surface of the imaging part 11 is a free-form surface, and light passes through the imaging part 11 of the free-form surface to form an effective imaging area 302 on the photosensitive element 30. The effective imaging area 302 covers the entirety of the photosensitive area 301 to make efficient use of the photosensitive area 301.
Establishing a coordinate axis for the optical lens 10, and determining an XY plane where the optical lens 10 is located. The imaging portion 11 of the optical lens 10 is symmetrical in the XY plane. The shape of the imaging portion 11 in the XY plane may be rectangular, elliptical, or other symmetrical shapes with respect to the XY plane. Preferably, the shape of the imaging portion 11 in the XY plane is a rectangle adapted to the shape of the photosensitive element 30, so that the effective imaging area 302 formed by the light transmitted from the imaging portion 11 in the photosensitive element 30 is a rectangle. The effective imaging area 302 can completely cover the photosensitive area 301, so as to improve the utilization rate of the photosensitive area 301.
Further, when the imaging unit 11 is designed to have a free-form surface, the distortion adjustment parameters of the imaging unit 11 in the X axis and the Y axis are not the same, and the imaging unit 11 is symmetrical only in the X axis or symmetrical in the Y axis.
When light enters the lens barrel 20 and passes through the optical lens 10, the light can pass through the imaging part 11 and the non-imaging part 12, the light passing through the imaging part 11 needs to participate in imaging, and the light passing through the non-imaging part 12 may also be captured by the photosensitive element 30, which may interfere with imaging.
When the optical lens 10 is designed, the surface of the imaging part 11 is designed as a free-form surface, which corrects distortion, the non-imaging part 12 is used for assembly, the surface height of the imaging part 11 and the surface height of the non-imaging part 12 are not consistent, and there is a fault in height. The difference in height between the image forming unit 11 and the non-image forming unit 12 causes a phenomenon such as flare, which adversely affects image formation. Wherein the fitting portion 121 of the non-imaging portion 12 is adapted to be fitted, and the transition portion 122 complements the face shape of the imaging portion 11 to connect the imaging portion 11 and the fitting portion 121 to form the optical lens 10.
The non-imaging section 12 is designed to avoid an adverse effect on imaging caused by a difference in height between the imaging section 11 and the non-imaging section 12. Specifically, the surface on the non-imaging portion 12 side is subjected to light blocking treatment to prevent light from passing through the non-imaging portion 12 and interfering with imaging. Referring to fig. 4A, the leaning surface 1211 of the fitting part 121 and the transition surface 1221 of the transition part 122 are light-blocking treated to prevent light from transmitting through the fitting part 121 and the transition part 122.
The side of the transition surface 1221 of the transition portion 122 close to the imaging portion 11 and the first surface 111 of the imaging portion 11 have a certain height difference, so that a fault plane 1222 is formed at the top end of the transition surface 1221 of the transition portion 122 to the surface of the extension portion of the first surface 111 of the imaging portion 11.
The fault plane 1222 has a certain height, and a certain fault is formed between the transition portion 122 and the imaging portion 11, so that a connection portion between the non-imaging portion 12 and the imaging portion 11 has a certain height difference.
The surface of the non-image forming portion 12 is subjected to light blocking treatment. Specifically, referring to fig. 4B, the leaning surface 1211 of the fitting part 121, the transition surface 1221 of the transition part 122 and the fault surface 1222 are light-blocking treated to prevent light from transmitting through the leaning surface 1211, the transition surface 1221 and the fault surface 1222, and to block light from transmitting through the non-imaging part 12 to participate in imaging.
The fault plane 1222 refracts and reflects light, and the fault plane 1222 is shielded from light to reduce the effect of light refraction and reflection caused by a high fault and to reduce the interference with imaging.
In another example of the present invention, light blocking processing is performed on the surfaces on both sides of the non-image forming portion 12 to block light from passing through the non-image forming portion 12.
Referring to fig. 5, the transition portion 122 is designed to have a planar shape so as to eliminate a height difference between the transition portion 122 and the imaging portion 11, the transition surface 1221 of the transition portion 122 is connected to the first surface 111 of the imaging portion 11, and the surface of the optical lens 10 naturally transitions from the non-imaging portion 12 to the imaging portion 11 so as to eliminate an adverse effect of flare or the like caused by the height difference between the non-imaging portion 12 and the imaging portion 11.
It is worth mentioning that the light blocking treatment is performed on the non-image forming portion 12, such as but not limited to a blacking treatment, a plating film, and the like.
The present invention further provides a manufacturing method for manufacturing an optical lens, the manufacturing method comprising the steps of:
(A) designing the surface of at least one side of an imaging part as a free-form surface; and
(B) a non-image forming portion is provided on an outer periphery of the image forming portion.
Wherein the shape of the imaging part in the XY plane is symmetrical, and the shape of the imaging part in the XY plane is symmetrical only about the X axis or only about the Y axis.
Wherein the step (B) further comprises the steps of:
supplementing a transition part to the periphery of the imaging part; and
an assembly portion is disposed about the periphery of the transition portion.
The transition part is connected with the assembly part and the imaging part, the shape design of the assembly part and the imaging part are not interfered with each other, and the transition part is used as transition and shape supplement.
Wherein the step (B) further comprises the steps of:
the shape of the assembling portion is designed to be adapted to an inner wall of a lens barrel.
The fitting portion is adapted to be fitted to an inner wall of the lens so that the optical lens is adapted to be fitted.
Wherein the step (B) further comprises the steps of:
the transition portion is face-shaped to eliminate a height difference between the transition portion and the imaging portion.
Because the imaging part is a free-form surface, the transition part is easy to have height difference in transition to the imaging part, and the transition part is subjected to surface design so as to eliminate the height difference and reduce the interference of stray light caused by the height difference on imaging.
Wherein the step (B) further comprises the steps of:
and light blocking processing is performed on the surface of at least one side of the non-imaging part.
And performing light blocking treatment on the surface of at least one side of the non-imaging part to avoid interference of light rays on imaging caused by the light rays penetrating through the non-imaging part.
Wherein the step (B) further comprises the steps of:
and performing light blocking treatment on a fault plane caused by the height difference between the transition part and the imaging part.
And light blocking processing is carried out on the fault plane between the transition part and the imaging part so as to reduce the interference on imaging caused by light ray refraction and reflection.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (29)
1. An optical lens adapted to be assembled to a lens barrel, comprising:
the imaging part is used for imaging the light rays emitted from the imaging part, wherein the surface of at least one side of the imaging part is a free-form surface; and
a non-image forming portion formed at an outer periphery of the image forming portion.
2. The optical lens of claim 1 wherein the non-imaging portion includes a fitting portion and a transition portion, the transition portion being formed at a periphery of the imaging portion, the fitting portion being formed at a periphery of the transition portion, the transition portion connecting the imaging portion and the fitting portion.
3. The optical lens according to claim 2, wherein a shape of the fitting portion is adapted to a shape of an inner wall of the barrel to which the optical lens is fitted so that the optical lens is fitted to the barrel.
4. The optical lens of claim 3 wherein the transition portion complements a shape of the imaging portion to fit with the fitting portion.
5. The optical lens according to claim 1, wherein at least one side surface of the non-imaging portion is light-blocking treated to block light from passing therethrough.
6. The optical lens according to claim 2, wherein the transition portion and the imaging portion have a height difference extending from an apex of a transition surface of the transition portion to a first surface of the imaging portion to form a fault plane.
7. The optical lens according to claim 6, wherein the fault plane is light blocking treated to prevent light rays from being refracted by the fault plane.
8. The optical lens of claim 2 wherein a blend surface of the blend portion and a first surface of the imaging portion are connected.
9. The optical lens according to claim 1, wherein a shape of the imaging portion in an XY plane is symmetrical about an X axis.
10. The optical lens according to claim 1, wherein a shape of the imaging portion in an XY plane is symmetrical about a Y axis.
11. An optical lens, comprising:
a lens barrel having an assembly space and an inner wall defining the assembly space; and
at least one optical lens mounted to the mounting space, wherein the optical lens includes:
the imaging part is used for light to penetrate and participate in imaging, and the surface of at least one side of the imaging part is a free-form surface; and
a non-imaging part formed on the periphery of the imaging part, wherein the periphery of the non-imaging part is matched with the inner wall of the lens barrel in shape.
12. The optical lens of claim 11, wherein the non-imaging portion includes a fitting portion and a transition portion, the transition portion being formed at an outer periphery of the imaging portion, the fitting portion being formed at an outer periphery of the transition portion, the transition portion connecting the imaging portion and the fitting portion.
13. The optical lens according to claim 12, wherein a shape of the fitting portion and a shape of the inner wall of the lens barrel to which it is fitted are adapted so that the optical lens is fitted to the fitting space of the lens barrel.
14. An optical lens according to claim 13, wherein the transition portion complements a shape of the imaging portion to fit with the fitting portion.
15. An optical lens according to claim 11, wherein a surface of at least one side of the non-imaging portion is light-blocking treated to block light from passing therethrough.
16. The optical lens of claim 12, wherein the transition portion and the imaging portion have a height difference extending from a top end of a transition surface of the transition portion to a first surface of the imaging portion to form a fault plane.
17. An optical lens according to claim 16, wherein the fault plane is light-blocking treated to prevent light rays from being catadioptric by the fault plane.
18. An optical lens according to claim 12, wherein a transition surface of the transition portion and a first surface of the imaging portion are connected.
19. The optical lens according to claim 11, wherein a shape of the imaging portion in an XY plane is symmetrical about an X axis.
20. The optical lens according to claim 11, wherein a shape of the imaging portion in an XY plane is symmetrical about a Y axis.
21. A camera module, comprising:
an optical lens, the optical lens comprising:
a lens barrel having an assembly space and an inner wall defining the assembly space; and
at least one optical lens mounted to the mounting space, wherein the optical lens includes:
the imaging part is used for light to penetrate and participate in imaging, and the surface of at least one side of the imaging part is a free-form surface; and
a non-imaging part formed on the periphery of the imaging part, wherein the periphery of the non-imaging part is matched with the shape of the inner wall of the lens barrel; and
and the photosensitive element is arranged on the emergent side of the optical lens, and the light beam emitted from the imaging part forms an effective imaging area on the photosensitive element.
22. The camera module of claim 21, wherein the photosensitive element has a photosensitive area, and the effective imaging area completely covers the photosensitive area.
23. The camera module of claim 22, wherein the shape of the active imaging area is adapted to the shape of the photosensitive area.
24. A method of manufacturing an optical lens, comprising the steps of:
(A) designing the surface of at least one side of an imaging part as a free-form surface; and
(B) a non-image forming portion is provided on an outer periphery of the image forming portion.
25. The method of manufacturing of claim 24, wherein the step (B) further comprises the steps of:
supplementing a transition part to the periphery of the imaging part; and
an assembly portion is disposed about the periphery of the transition portion.
26. The method of manufacturing of claim 25, wherein the step (B) further comprises the steps of:
the shape of the assembling portion is designed to be adapted to an inner wall of a lens barrel.
27. The method of manufacturing of claim 24, wherein the step (B) further comprises the steps of:
and light blocking processing is performed on the surface of at least one side of the non-imaging part.
28. The method of manufacturing of claim 25, wherein the step (B) further comprises the steps of:
and performing light blocking treatment on a fault plane caused by the height difference between the transition part and the imaging part.
29. The method of manufacturing of claim 24, wherein the step (B) further comprises the steps of:
the transition portion is face-shaped to eliminate a height difference between the transition portion and the imaging portion.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037376.9A CN112748513A (en) | 2019-10-29 | 2019-10-29 | Camera module, optical lens thereof, optical lens and manufacturing method |
| PCT/CN2020/112263 WO2021082705A1 (en) | 2019-10-29 | 2020-08-28 | Camera module and optical lens thereof, optical lens sheet and fabrication method therefor, and method for assembling large wide-angle camera module |
| EP20883455.6A EP4043939A4 (en) | 2019-10-29 | 2020-08-28 | Camera module and optical lens thereof, optical lens sheet and fabrication method therefor, and method for assembling large wide-angle camera module |
| CN202080076353.3A CN114730061B (en) | 2019-10-29 | 2020-08-28 | Image pickup module, optical lens and manufacturing method thereof, and assembly method of large-wide-angle image pickup module |
| US17/772,636 US20220413250A1 (en) | 2019-10-29 | 2020-08-28 | Camera module and optical lens thereof, optical lens sheet and fabrication method therefor, and method for assembling large wide-angle camera module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911037376.9A CN112748513A (en) | 2019-10-29 | 2019-10-29 | Camera module, optical lens thereof, optical lens and manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN112748513A true CN112748513A (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911037376.9A Pending CN112748513A (en) | 2019-10-29 | 2019-10-29 | Camera module, optical lens thereof, optical lens and manufacturing method |
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| CN (1) | CN112748513A (en) |
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