Built-in lens and mobile phone camera
By designing an anamorphic lens group and a plastic optical lens group for the built-in lens, the problem of lens thickness compression was solved, achieving ultra-thin lenses and high-quality imaging to meet the shooting needs of mobile devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-31
AI Technical Summary
How to reduce the thickness of the optical lens module while ensuring image quality to achieve an ultra-thin mobile phone?
Design an internal lens comprising a deformable lens group and a plastic optical lens group. By setting the first lens as a first cylindrical mirror, the third and fourth lenses as cemented cylindrical mirrors, and using a prism to deflect the light path, and combining irregularly shaped lenses to replace traditional circular lenses, optimize the space utilization and chromatic aberration correction of the optical system.
It achieves a reduction in the overall size of the lens, which can reduce the size of the lens in the Z direction while ensuring image quality, adapting to the shooting needs of wide screens on mobile devices, and restoring the imaging ratio through algorithms to improve relative illumination and chromatic aberration correction effects.
Smart Images
Figure CN224067064U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical device technology, and in particular to a built-in lens and mobile phone camera. Background Technology
[0002] With the rapid development of science and technology and the increasing demand for photography and videography, the camera function of mobile phones has developed rapidly. As an indispensable component of the mobile phone imaging system, the optical lens can directly affect the quality of the image and the implementation and effect of the algorithm.
[0003] Achieving ultra-thin designs is a long-standing goal for mobile phone manufacturers, and reducing the thickness of optical lens modules is a key direction for this goal. Some manufacturers are applying periscope lenses, liquid lenses, and meta lenses to mobile phones to achieve ultra-thin designs. However, how to reduce the thickness of optical lens modules while maintaining image quality is a pressing issue that needs to be addressed. Utility Model Content
[0004] One advantage of this application is that it provides a built-in lens and mobile phone camera that can reduce the thickness of the optical lens module while ensuring image quality, thereby achieving an ultra-thin mobile phone.
[0005] On one hand, this application provides a built-in lens, including:
[0006] A deformable lens group, comprising a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object side to the image side, wherein the first lens is a first cylindrical mirror, the second lens is a prism, and the third and fourth lenses are cemented cylindrical mirrors; and
[0007] A plastic optical lens group, disposed on the image side of the deformable lens group, includes a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with negative optical power.
[0008] In some embodiments of this application, the object-side and image-side surfaces of the first lens, the third lens, and the fourth lens are all deformable aspherical surfaces; and the deformable aspherical surfaces satisfy the following relationship:
[0009]
[0010] Where z is the distance sagitta from any point on the deformed aspherical surface to the vertex of the aspherical surface; (x, y) are the coordinates of any point on the deformed aspherical surface, CUX is the curvature of the deformed aspherical surface in the X direction, CUY is the curvature of the deformed aspherical surface in the Y direction, KX is the K coefficient of the deformed aspherical surface in the X direction, and KY is the K coefficient of the deformed aspherical surface in the Y direction.
[0011] In some embodiments of the present application, the built-in lens satisfies the relationship: 1.25 < EFLY / EFLX < 1.6; where EFLX is the effective focal length of the built-in lens in the X direction, and EFLY is the effective focal length of the built-in lens in the Y direction.
[0012] In some embodiments of the present application, the built-in lens satisfies the relationship:
[0013] L < 30 mm; H < 4.5 mm; and W < 15 mm; where L is the length of the built-in lens, H is the height of the built-in lens, and W is the width of the built-in lens.
[0014] In some embodiments of the present application, the absolute value of the distortion of the built-in lens is less than 2%.
[0015] In some embodiments of the present application, the built-in lens satisfies the relationships: 2.24 < EFLX / EPDX < 3; and 1.88 < EFLY / EPDY < 2.5; where EFLX is the effective focal length of the built-in lens in the X direction, EPDX is the entrance pupil diameter of the built-in lens in the X direction, EFLY is the effective focal length of the built-in lens in the Y direction, and EPDY is the entrance pupil diameter of the built-in lens in the Y direction.
[0016] In some embodiments of the present application, the refractive index of the first lens is less than 1.55.
[0017] In some embodiments of the present application, the built-in lens further includes an aperture, and the aperture is disposed between the deformed lens group and the plastic optical lens group.
[0018] In some embodiments of the present application, the built-in lens further includes a color filter, and the color filter is disposed on the image side of the plastic optical lens group.
[0019] On the other hand, the present application provides a mobile phone camera, including:
[0020] A camera component; and
[0021] The built-in lens as described in any one of the above, and the built-in lens is mounted on the camera component.
[0022] In summary, this application, through a uniquely designed built-in lens, enables a reduction in the overall size of the lens. Combined with a periscope-style, high-quality camera assembly, this results in a miniaturized mobile phone camera. Unlike traditional lenses, this built-in lens has a different radial focal length and the same F-number as traditional circular lenses. By using an irregularly shaped lens instead of a traditional circular lens, the image aspect ratio changes from 4:3 to 8:3 while maintaining the same field of view (FOV). Compared to traditional lens imaging, the image formed by this built-in lens can be reduced by half in the Z-direction, and can subsequently be restored to the common 4:3 size through algorithms to meet the needs of mobile devices and widescreen shooting.
[0023] The morphing lens group of the built-in lens in this application sets the first lens as a first cylindrical mirror and the third and fourth lenses as cemented cylindrical mirrors. This allows the first, third, and fourth lenses to undertake the distortion function of the optical system. Furthermore, by introducing a K-order coefficient into the first cylindrical mirror, it facilitates compression in the Z-direction of the lens, thereby reducing its size. By cementing the third and fourth lenses to form a cemented cylindrical mirror, it helps correct chromatic aberration, ensuring good chromatic aberration performance within the visible light wavelength range. The third and fourth lenses can be made of glass to achieve better chromatic aberration correction. By setting the second lens as a prism, it can redirect the light path by 90°, making better use of space. This plastic optical lens group bears the main optical power of the entire optical system, reasonably controlling the contribution of spherical aberration within a reasonable level, resulting in good image quality in the on-axis field of view, while also allowing light to converge more quickly for better relative illumination. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of a built-in lens according to one embodiment of this application;
[0025] Figure 2A The MTF curve of the built-in lens in Embodiment 1 of this application when the resolution is 100 lp / mm;
[0026] Figure 2B The MTF curve of the built-in lens in Embodiment 1 of this application when the resolution is 200 lp / mm;
[0027] Figure 2C This is a distortion curve diagram of the built-in lens in Embodiment 1 of this application;
[0028] Figure 3A This is an MTF curve of the built-in lens in Embodiment 2 of this application when the resolution is 100 lp / mm;
[0029] Figure 3B The MTF curve of the built-in lens in Embodiment 2 of this application when the resolution is 200 lp / mm;
[0030] Figure 3C This is a distortion curve diagram of the built-in lens in Embodiment 2 of this application;
[0031] Figure 4A The MTF curve of the built-in lens in Embodiment 3 of this application when the resolution is 100 lp / mm;
[0032] Figure 4B The MTF curve of the built-in lens in Embodiment 3 of this application when the resolution is 200 lp / mm;
[0033] Figure 4C This is a distortion curve of the built-in lens in Embodiment 3 of this application.
[0034] Reference numerals: L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens. Detailed Implementation
[0035] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0036] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.
[0037] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.
[0038] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.
[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0040] On one hand, this application provides a mobile phone camera, which may include a camera assembly and a built-in lens, the built-in lens being mounted on the camera assembly. This application, through a unique design of the built-in lens, enables a reduction in the overall size of the lens. Combined with a periscope-style, high-quality camera assembly, this results in a miniaturized mobile phone camera. Unlike traditional lenses, this built-in lens has a different radial focal length and the same F-number as traditional circular lenses. This built-in lens utilizes an irregularly shaped lens instead of a traditional circular lens, changing the image aspect ratio from 4:3 to 8:3 while maintaining the same field of view (FOV). Compared to traditional lens imaging, the image formed by this built-in lens can be reduced by half in the Z-direction, and can subsequently be restored to the common 4:3 size through algorithms to meet the usage and shooting needs of widescreen mobile devices.
[0041] On the other hand, such as Figure 1 As shown, one embodiment of this application proposes a built-in lens, which may include an anamorphic lens group and a plastic optical lens group. The plastic optical lens group is disposed on the image side of the anamorphic lens group. The anamorphic lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object side to the image side. The first lens is a first cylindrical mirror, the second lens is a prism, and the third and fourth lenses are cemented cylindrical mirrors. The plastic optical lens group includes a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with negative optical power.
[0042] It should be noted that by setting the first lens as a first cylindrical lens and the third and fourth lenses as cemented cylindrical lenses, the first, third, and fourth lenses can bear the deformation effect of the optical system. Moreover, by introducing the K - order coefficient into the first cylindrical lens, it is beneficial to compress the lens in the Z - direction, thereby reducing the lens volume. By forming the third and fourth lenses into a cemented cylindrical lens through cementing, it is beneficial to correct the chromatic aberration of the lens and ensure a good chromatic aberration effect within the visible light wavelength range. The materials of the third and fourth lenses can be selected as glass materials to obtain a better chromatic aberration correction effect. By setting the second lens as a turning prism, the second lens can play the role of turning the optical path, thereby turning the optical path of the optical system by 90°, so as to make more reasonable use of space. The plastic optical lens group is used to bear the main optical power of the entire optical system, can reasonably control the spherical aberration contribution within a reasonable level, enabling good imaging quality in the on - axis field of view, and at the same time enabling the light to converge more quickly to obtain a better relative illumination.
[0043] According to some embodiments of the present application, the object side and image side of the first lens, the object side and image side of the third lens, and the object side and image side of the fourth lens are all deformed aspherical surfaces; and the deformed aspherical surface satisfies the relationship:
[0044]
[0045] where z is the distance sagitta of any point on the deformed aspherical surface from the vertex of the aspherical surface; (x, y) is the coordinate of any point on the deformed aspherical surface, CUX is the curvature of the deformed aspherical surface along the X - direction, CUY is the curvature of the deformed aspherical surface along the Y - direction, KX is the K - coefficient of the deformed aspherical surface along the X - direction, and KY is the K - coefficient of the deformed aspherical surface along the Y - direction. In this way, by reasonably designing the curvature CUX of the deformed aspherical surface along the X - direction, the curvature CUY along the Y - direction, the K - coefficient KX along the X - direction, and the K - coefficient KY along the Y - direction, different deformation ratios can be obtained. By selecting an appropriate deformation ratio, the picture obtained by the lens can be more conducive to algorithm recovery.
[0046] According to some embodiments of the present application, the built - in lens satisfies the relationship: 1.25 < EFLY / EFLX < 1.6; where EFLX is the effective focal length of the built - in lens along the X - direction, and EFLY is the effective focal length of the built - in lens along the Y - direction. In this way, EFLY / EFLX represents the ratio of the effective focal lengths of the built - in lens along the X - direction and Y - direction. The larger the ratio of EFLY and EFLX, the greater the deformation in the X - direction and Y - direction. By controlling the different effective focal lengths of the built - in lens along the X - direction and Y - direction, different depths of field can be obtained to photograph scenes, and by controlling an appropriate deformation ratio, the picture obtained by the lens can be more conducive to algorithm recovery.
[0047] According to some embodiments of the present application, the built-in lens satisfies the relationships: L < 30 mm; H < 4.5 mm; and W < 15 mm; where L is the length of the built-in lens, H is the height of the built-in lens, and W is the width of the built-in lens. In this way, by reasonably setting the volume of the lens, the lens can be made more competitive in the market.
[0048] According to some embodiments of the present application, the absolute value of the distortion of the built-in lens is less than 2%. In this way, by controlling the absolute value of the distortion of the lens, the relative illumination of the optical system can be effectively improved.
[0049] According to some embodiments of the present application, the built-in lens satisfies the relationships: 2.24 < EFLX / EPDX < 3; and 1.88 < EFLY / EPDY < 2.5; where EFLX is the effective focal length of the built-in lens in the X direction, EPDX is the entrance pupil diameter of the built-in lens in the X direction, EFLY is the effective focal length of the built-in lens in the Y direction, and EPDY is the entrance pupil diameter of the built-in lens in the Y direction. In this way, by respectively controlling the ratios of the effective focal lengths and the entrance pupils of the built-in lens in the X and Y directions within a reasonable range, appropriate depth-of-field ratios can be obtained in the X and Y directions, thereby enhancing the sense of hierarchy of the picture.
[0050] According to some embodiments of the present application, the refractive index of the first lens is less than 1.55. In this way, by controlling the refractive index of the first lens to be less than 1.55, the first lens can use a low-refractive-index material, thereby saving the lens cost.
[0051] According to some embodiments of the present application, the built-in lens further includes an aperture, which is disposed between the anamorphic lens group and the plastic optical lens group. In this way, the aperture can reduce the coma and astigmatism of the optical system, and at the same time, it can also compress the incident angle of the light at the aperture position, thereby better controlling the shape and size of the distortion.
[0052] According to some embodiments of the present application, the built-in lens further includes a color filter, which is disposed on the image side of the plastic optical lens group. In this way, the color filter can enhance the image quality and correct chromatic aberration.
[0053] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the built-in lens (not shown in the figure), S1 represents the object-side plane of the first lens L1, S2 represents the image-side plane of the first lens L1, S3 represents the object-side plane of the second lens L2, S4 represents the image-side plane of the second lens L2, S5 represents the object-side plane of the third lens L3, S6 represents the image-side plane of the third lens L3 and the fourth lens L4, S7 represents the image-side plane of the fourth lens L4, S8 represents the aperture stop, S9 represents the object-side plane of the fifth lens L5, S10 represents the image-side plane of the fifth lens L5, S1 S1 represents the object-side plane of the sixth lens L6, S12 represents the image-side plane of the sixth lens L6, S13 represents the object-side plane of the seventh lens L7, S14 represents the image-side plane of the seventh lens L7, S15 represents the object-side plane of the eighth lens L8, S16 represents the image-side plane of the eighth lens L8, S17 represents the object-side plane of the ninth lens L9, S18 represents the image-side plane of the ninth lens L9, S19 (not shown in the figure) can represent the object-side plane of the color filter, S20 (not shown in the figure) can represent the image-side plane of the color filter, and S21 (not shown in the figure) represents the image plane of the built-in lens. Furthermore, Aj represents the j-th order aspherical coefficient, where j = 4, 6, 8, 10, 12, 14, 16, 18, 20.
[0054] Example 1
[0055] like Figure 1 As shown, in this embodiment, the built-in lens includes a deformable lens group and a plastic optical lens group. The plastic optical lens group is disposed on the image side of the deformable lens group. The deformable lens group includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side along the optical axis. The first lens L1 is a first cylindrical mirror, the second lens L2 is a prism, and the third lens L3 and the fourth lens L4 are cemented cylindrical mirrors. The plastic optical lens group includes a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and a ninth lens L9 with negative optical power. The object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex surfaces. The object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave surfaces. The object-side surface S13 and the image-side surface S14 of the seventh lens L7 are concave and convex, respectively. The object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both concave surfaces. The object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both concave surfaces.
[0056] The built-in lens also includes an aperture stop and a color filter. The aperture stop is positioned between the anamorphic lens group and the plastic optical lens group, and the color filter is positioned on the image side of the plastic optical lens group.
[0057] Furthermore, Table 1 shows the basic optical parameters of the built-in lens in Embodiment 1, where radius of curvature X represents the radius of curvature of the lens along the X direction, radius of curvature Y represents the radius of curvature of the lens along the Y direction, thickness / distance represents the thickness of the object-side surface of the lens to the image-side surface or the distance between two adjacent elements, radius X represents the effective radius of the lens surface along the X direction, Y represents the effective radius of the lens surface along the Y direction, KX represents the K coefficient of the lens surface along the X direction, and KY represents the K coefficient of the lens surface along the Y direction. The units of radius of curvature X, radius of curvature Y, thickness / distance, effective radius X, and effective radius Y are all millimeters (mm).
[0058] Table 1: Basic optical parameters of the built-in lens in Example 1
[0059]
[0060] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, in Table 1, the materials 1.54 and 56.1 of S1 indicate that the refractive index of the first lens L1 is 1.54 and the Abbe number is 56.1, respectively.
[0061] In this embodiment, the object-side surface and image-side surface of any one of the fifth lens L5 to the ninth lens L9 are both Qcon aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:
[0062]
[0063] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S9 to S18 in Example 1.
[0064] Table 2: Aspherical coefficient table of the built-in lens in Example 1
[0065]
[0066] like Figure 2A The figure shown is the MTF curve of the built-in lens of Embodiment 1 at a resolution of 100 lp / mm, which represents the imaging performance of the built-in lens of Embodiment 1 at a resolution of 100 lp / mm. Figure 2BThe image shows the MTF curve of the built-in lens in Embodiment 1 at a resolution of 200 lp / mm, which represents the imaging performance of the built-in lens in Embodiment 1 at a resolution of 200 lp / mm. Figure 2C This is a distortion curve diagram of the built-in lens in Embodiment 1, which shows the distortion and its variation law of the built-in lens in Embodiment 1 under different field of view angles. According to... Figure 2A , Figure 2B and Figure 2C It can be seen that the built-in lens in Embodiment 1 can achieve good image quality.
[0067] Example 2
[0068] In this embodiment, the built-in lens includes a deformable lens group and a plastic optical lens group. The plastic optical lens group is disposed on the image side of the deformable lens group. The deformable lens group includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side along the optical axis. The first lens L1 is a first cylindrical mirror, the second lens L2 is a prism, and the third lens L3 and the fourth lens L4 are cemented cylindrical mirrors. The plastic optical lens group includes a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and a ninth lens L9 with negative optical power. The object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex surfaces. The object-side surface S11 and the image-side surface S12 of the sixth lens L6 are convex and concave surfaces, respectively. The object-side surface S13 and the image-side surface S14 of the seventh lens L7 are both convex surfaces. The object-side surface S15 and the image-side surface S16 of the eighth lens L8 are both concave surfaces. The object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both concave surfaces.
[0069] The built-in lens also includes an aperture stop and a color filter. The aperture stop is positioned between the anamorphic lens group and the plastic optical lens group, and the color filter is positioned on the image side of the plastic optical lens group.
[0070] Furthermore, Table 3 shows the basic optical parameters of the built-in lens in Embodiment 2, where radius of curvature X represents the radius of curvature of the lens along the X direction, radius of curvature Y represents the radius of curvature of the lens along the Y direction, thickness / distance represents the thickness of the object-side surface of the lens to the image-side surface or the distance between two adjacent elements, radius X represents the effective radius of the lens surface along the X direction, Y represents the effective radius of the lens surface along the Y direction, KX represents the K coefficient of the lens surface along the X direction, and KY represents the K coefficient of the lens surface along the Y direction. The units of radius of curvature X, radius of curvature Y, thickness / distance, effective radius X, and effective radius Y are all millimeters (mm).
[0071] Table 3: Basic optical parameters of the built-in lens in Example 2
[0072]
[0073] In this embodiment, the object-side surface and image-side surface of any one of the fifth lens L5 to the ninth lens L9 are both Qcon aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical formula given in the above embodiment 1.
[0074] Table 4 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S9 to S18 in Example 2.
[0075] Table 4: Aspherical coefficient table of the built-in lens in Example 2
[0076]
[0077] like Figure 3A The figure shown is the MTF curve of the built-in lens of Embodiment 2 at a resolution of 100 lp / mm, which represents the imaging performance of the built-in lens of Embodiment 2 at a resolution of 100 lp / mm. Figure 3B The image shows the MTF curve of the built-in lens in Example 2 at a resolution of 200 lp / mm, which represents the imaging performance of the built-in lens in Example 2 at a resolution of 200 lp / mm. Figure 3C This is a distortion curve diagram of the built-in lens in Embodiment 2, which shows the distortion and its variation law of the built-in lens in Embodiment 2 under different field of view angles. According to... Figure 3A , Figure 3B and Figure 3C It can be seen that the built-in lens in Embodiment 2 can achieve good image quality.
[0078] Example 3
[0079] In this embodiment, the built-in lens includes a deformable lens group and a plastic optical lens group. The plastic optical lens group is disposed on the image side of the deformable lens group. The deformable lens group includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side along the optical axis. The first lens L1 is a first cylindrical mirror, the second lens L2 is a prism, and the third lens L3 and the fourth lens L4 are cemented cylindrical mirrors. The plastic optical lens group includes a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and a ninth lens L9 with negative optical power. The object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex surfaces. The object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave surfaces. The object-side surface S13 and the image-side surface S14 of the seventh lens L7 are both convex surfaces. The object-side surface S15 and the image-side surface S16 of the eighth lens L8 are convex and concave surfaces, respectively. The object-side surface S17 and the image-side surface S18 of the ninth lens L9 are both concave surfaces.
[0080] The built-in lens also includes an aperture stop and a color filter. The aperture stop is positioned between the anamorphic lens group and the plastic optical lens group, and the color filter is positioned on the image side of the plastic optical lens group.
[0081] Furthermore, Table 5 shows the basic optical parameters of the built-in lens in Embodiment 3, where radius of curvature X represents the radius of curvature of the lens along the X direction, radius of curvature Y represents the radius of curvature of the lens along the Y direction, thickness / distance represents the thickness of the object-side surface of the lens to the image-side surface or the distance between two adjacent elements, radius X represents the effective radius of the lens surface along the X direction, Y represents the effective radius of the lens surface along the Y direction, KX represents the K coefficient of the lens surface along the X direction, and KY represents the K coefficient of the lens surface along the Y direction. The units of radius of curvature X, radius of curvature Y, thickness / distance, effective radius X, and effective radius Y are all millimeters (mm).
[0082] Table 5: Basic optical parameters of the built-in lens in Example 3
[0083]
[0084]
[0085] In this embodiment, the object-side surface and image-side surface of any one of the fifth lens L5 to the ninth lens L9 are both Qcon aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical formula given in the above embodiment 1.
[0086] Table 6 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S9 to S18 in Example 3.
[0087] Table 6: Aspherical coefficient table of the built-in lens in Example 3
[0088]
[0089]
[0090] like Figure 4A The figure shown is the MTF curve of the built-in lens of Embodiment 3 at a resolution of 100 lp / mm, which represents the imaging performance of the built-in lens of Embodiment 3 at a resolution of 100 lp / mm. Figure 4B The image shows the MTF curve of the built-in lens in Example 3 at a resolution of 200 lp / mm, which represents the imaging performance of the built-in lens in Example 3 at a resolution of 200 lp / mm. Figure 4C This is a distortion curve diagram of the built-in lens in Embodiment 3, which shows the distortion and its variation law of the built-in lens in Embodiment 3 under different field of view angles. According to... Figure 4A , Figure 4B and Figure 4C It can be seen that the built-in lens in Embodiment 3 can achieve good image quality.
[0091] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0092] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An intra-lens, characterized by: Comprising: a deformed lens group comprising a first lens, a second lens, a third lens and a fourth lens arranged in order from an object side to an image side along an optical axis, wherein the first lens is a first cylindrical lens, the second lens is a turning prism, and the third lens and the fourth lens are cemented cylindrical lenses; and a plastic optical lens group arranged on the image side of the deformed lens group, comprising a fifth lens having positive refractive power, a sixth lens having negative refractive power, a seventh lens having positive refractive power, an eighth lens having negative refractive power, and a ninth lens having negative refractive power.
2. The built-in lens according to claim 1, wherein The object side surface and the image side surface of the first lens, the object side surface and the image side surface of the third lens, and the object side surface and the image side surface of the fourth lens are all deformed aspherical surfaces, and the deformed aspherical surfaces satisfy the following relationship: wherein z is the sag of any point on the deformed aspherical surface, (x, y) is the coordinate of any point on the deformed aspherical surface, CUX is the curvature of the deformed aspherical surface along the X direction, CUY is the curvature of the deformed aspherical surface along the Y direction, KX is the K coefficient of the deformed aspherical surface along the X direction, and KY is the K coefficient of the deformed aspherical surface along the Y direction.
3. The built-in lens according to claim 1, wherein The built-in lens satisfies the following relationship: 1.25 < EFLY / EFLX < 1.6; wherein EFLX is the effective focal length of the built-in lens along the X direction, and EFLY is the effective focal length of the built-in lens along the Y direction.
4. The built-in lens according to claim 1, wherein The built-in lens satisfies the following relationship: L < 30 mm; H < 4.5 mm; and W < 15 mm; wherein L is the length of the built-in lens, H is the height of the built-in lens, and W is the width of the built-in lens.
5. The built-in lens according to claim 1, wherein The absolute value of the distortion of the built-in lens is less than 2%.
6. The built-in lens according to claim 1, wherein The built-in lens satisfies the following relationship: 2.24 < EFLX / EPDX < 3; and 1.88 < EFLY / EPDY < 2.5; wherein EFLX is the effective focal length of the built-in lens along the X direction, EPDX is the entrance pupil diameter of the built-in lens along the X direction, EFLY is the effective focal length of the built-in lens along the Y direction, and EPDY is the entrance pupil diameter of the built-in lens along the Y direction.
7. The built-in lens according to claim 1, wherein The refractive index of the first lens is less than 1.
55.
8. The built-in lens according to claim 1, wherein The built-in lens further comprises a diaphragm arranged between the deformed lens group and the plastic optical lens group.
9. The intra- lens according to any one of claims 1 to 8, wherein The built-in lens further comprises a color filter arranged on the image side of the plastic optical lens group.
10. A camera phone, characterized by Comprising: a camera assembly; and the built-in lens according to any one of claims 1 to 9, which is mounted to the camera assembly.