CN113391430B - Optical system, lens module and electronic equipment - Google Patents
Optical system, lens module and electronic equipment Download PDFInfo
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- CN113391430B CN113391430B CN202110577101.5A CN202110577101A CN113391430B CN 113391430 B CN113391430 B CN 113391430B CN 202110577101 A CN202110577101 A CN 202110577101A CN 113391430 B CN113391430 B CN 113391430B
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- 238000003384 imaging method Methods 0.000 claims abstract description 42
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- 230000004075 alteration Effects 0.000 description 39
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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Classifications
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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
- G02B13/001—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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
An optical system, a lens module and an electronic device, wherein the optical system sequentially comprises from an object side to an image side along an optical axis: the first lens element with refractive power has positive refractive power, and the second lens element with negative refractive power. The object side surfaces of the first lens element, the second lens element, the fifth lens element and the sixth lens element and the image side surface of the fourth lens element are convex at a paraxial region, and the object side surfaces of the second lens element, the fifth lens element and the sixth lens element and the image side surface of the fourth lens element are concave at a paraxial region. The optical system satisfies the relation: 0.2< SD11/ImgH <0.31; the SD11 is half of the maximum effective aperture of the object side surface of the first lens, and the ImgH is the radius of the maximum effective imaging circle of the optical system. The surface type and the refractive power of each lens of the optical system are reasonably designed, and the surface type and the refractive power meet the relation, so that tolerance sensitivity of the optical system is reduced, small-head design is realized, and the equipment screen ratio is improved.
Description
Technical Field
The present invention relates to the field of optical imaging technology, and in particular, to an optical system, a lens module, and an electronic device.
Background
Along with the development of photography, the current common electronic equipment generally adopts a hole digging design on one side of a display screen to be matched with a camera, and meanwhile, the bang area is removed to increase the screen occupation ratio of the equipment. For devices with screen hole digging designs, the structure of the camera lens largely determines the aperture size of the screen, thereby affecting the screen duty cycle of the device.
Along with the continuous updating of electronic technology, electronic equipment such as smart phones gradually develop to larger screens and more attractive directions, and the screen occupation ratio requirement is gradually increased, but the size of the shooting lens on the screen of the electronic equipment cannot be reduced due to the fact that the lens head of a conventional lens is too large. In addition, the small-head lens in the past often has larger holes at the front end of the screen due to larger viewpoint depth, so that the problem of reducing the screen occupation ratio of the electronic equipment is caused. As such, it has become one of the important points in the industry to design an imaging lens that can cooperate with a display screen to increase the device screen ratio while maintaining good quality and achieving miniaturization.
Disclosure of Invention
The invention aims to provide an optical system, a lens module and electronic equipment, which have the characteristics of high image quality, high screen occupation ratio and easiness in realization of miniaturization.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, the present invention provides an optical system, including, in order from an object side to an image side in an optical axis direction: a first lens element with positive refractive power having a convex object-side surface at a paraxial region; a second lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a third lens element with positive refractive power; a fourth lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; a fifth lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a sixth lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical system satisfies the relation: 0.2< SD11/ImgH <0.31; wherein SD11 is half of the maximum effective aperture of the first lens object side surface, and ImgH is the radius of the maximum effective imaging circle of the optical system.
The refractive power of the first lens element to the third lens element of the optical system is designed as above, so that light rays can enter the optical system more easily, aberration is reduced, the subsequent lens group can correct the aberration, and the tolerance sensitivity can be reduced while the optical system is compact in structure by arranging the surface types of the first lens element to the third lens element into the structure. Meanwhile, when the optical system is applied to lens design, the size of the head of the lens can be smaller than that of the tail as much as possible, and the design requirement of the small-head lens can be met. The size of the first lens in the radial direction is reduced, so that the optical system can realize small-head design, and the size of an opening of a screen can be reduced when the optical system is applied to electronic equipment, so that the screen occupation ratio of the equipment can be improved.
In one embodiment, the optical system satisfies the relationship: 1.8mm < ImgH/FNO <2.5mm; wherein FNO is the f-number of the optical system. The optical system can be provided with a large image surface to match a high-pixel photosensitive chip, so that the image resolution is improved, and meanwhile, the optical system is provided with a large aperture, so that the light inlet amount of the optical system is increased. When the relation lower limit is exceeded and the aperture number is fixed, the image height is easy to be insufficient, and the high-pixel photosensitive chip is difficult to match; when the upper limit of the relation is exceeded, the f-number is too small and the aberration is difficult to handle when the image is high.
In one embodiment, the optical system satisfies the relationship: 0.15< CT1/TTL <0.2; wherein, CT1 is the thickness of the first lens element on the optical axis, and TTL is the distance from the object side surface of the first lens element to the imaging surface on the optical axis. The relation is satisfied, the optical system is provided with the first lens with a thicker center, so that the mechanical bearing position of the first lens can be enabled to move towards the image side fully, when the optical system is applied to lens design, the embedding depth of a lens is facilitated, meanwhile, the diameter of the head of the lens is reduced, the appearance structure of the lens is optimized, and the design effect of a full screen is improved.
In one embodiment, the optical system satisfies the relationship: 0.6mm < ET1<0.9mm; and ET1 is the distance from the maximum effective caliber of the object side surface of the first lens to the maximum effective caliber of the image side surface in the optical axis direction. The relation is satisfied, the first lens has larger edge thickness, which is beneficial to enlarging the longitudinal depth of the first lens in the optical axis direction, so that the lens applying the optical system has the characteristic of long head depth, and can be well matched with a lens head control mechanism.
In one embodiment, the optical system satisfies the relationship: 38 ° < HFOV <45 °; wherein the HFOV is one half of the maximum field angle of the optical system. The above relation is satisfied, and in this range, a lens or an electronic device to which the optical system is applied can be made to have a relatively large angle of view, so that a wider field of view can be photographed. At the same time, the size of the first lens is not increased, and the assembly is easier. Exceeding the upper limit of the relation, the angle of view of the optical system is too large, and the first lens has the risk of increasing in size, so that the space utilization is not facilitated; beyond the lower limit of the relation, the angle of view of the optical system is not large enough, and it is difficult to photograph a wider field of view.
In one embodiment, the optical system satisfies the relationship: 1.2< TTL/f <1.3; wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the effective focal length of the optical system. The optical system has a balanced size and focal length, i.e. a longer focal length, which is beneficial for taking far scenes, and a smaller total optical length, which reduces the size of the optical system. Exceeding the upper limit of the relation, the total length of the optical system is too long, the optical system is not easy to assemble, or the focal length is too short, so that clear shooting and remote shooting are difficult; beyond the lower limit of the relation, the angle of view of the optical system decreases, and it is difficult to capture a wider scene.
In one embodiment, the optical system satisfies the relationship 8< | (r61+r62)/(r61—r62) | <240; wherein R61 is a radius of curvature of the object-side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image-side surface of the sixth lens element at the optical axis. The curvature radius of the object side surface of the sixth lens element at the optical axis and the curvature radius of the image side surface of the sixth lens element at the optical axis can be properly configured, so that the shape of the sixth lens element is not excessively bent, the astigmatic aberration of the optical system can be corrected, the performance variation sensitivity of the optical system can be reduced, and the product yield can be improved.
In one embodiment, the optical system satisfies the relationship: 2.5< ct6/|sag61| <8; wherein CT6 is the thickness of the sixth lens element on the optical axis, and SAG61 is the sagittal height of the object-side surface of the sixth lens element at the maximum effective half-aperture. The shape of the sixth lens can be well controlled by satisfying the above relation, thereby facilitating the manufacture and molding of the lens and reducing the defect of poor molding. Meanwhile, the field curvature generated by each lens in the object side can be trimmed, so that the balance of the field curvature of the optical system is ensured, namely, the field curvature sizes of different view fields tend to be balanced, so that the picture quality of the whole system picture is uniform, and the imaging quality of the optical system is improved. When CT6/|SAG61| <2.5, the object side surface of the sixth lens element is excessively curved in the circumferential plane, which may result in poor molding and affect the manufacturing yield. When CT6/|SAG61| > 8, the object side surface of the sixth lens is too smooth at the circumference, and the off-axis visual field light ray deflection capability is insufficient, so that distortion and field curvature aberration correction are not facilitated.
In one embodiment, the optical system satisfies the relationship: 1.5< |f56/f12| <6.5; wherein f56 is a combined focal length of the fifth lens and the sixth lens, and f12 is a combined focal length of the first lens and the second lens. The aberration of the front lens group and the aberration of the rear lens group of the optical system are mutually corrected, so that the imaging quality of the optical system is stable. And the refractive power distribution of the front lens group and the rear lens group is reasonable, the light transmission is easier, and the improvement of the photosensitive efficiency on the imaging surface is facilitated.
In a second aspect, the present invention further provides a lens module, which includes the optical system according to any one of the embodiments of the first aspect. By adding the optical system provided by the invention into the lens module, the lens module has the characteristics of high image quality, small head and high screen ratio by reasonably designing the surface type and the refractive power of each lens in the optical system.
In a third aspect, the present invention further provides an electronic device, where the electronic device includes a housing and the lens module set in the second aspect, and the lens module set is disposed in the housing. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has higher resolution and better imaging quality and higher screen duty ratio.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an optical system of a first embodiment;
FIG. 2 is a longitudinal spherical aberration curve, astigmatic curve, and distortion curve of the first embodiment;
fig. 3 is a schematic structural view of an optical system of a second embodiment;
FIG. 4 is a longitudinal spherical aberration curve, astigmatic curve, and distortion curve of a second embodiment;
fig. 5 is a schematic structural view of an optical system of a third embodiment;
FIG. 6 is a longitudinal spherical aberration curve, astigmatic curve, and distortion curve of a third embodiment;
fig. 7 is a schematic structural view of an optical system of a fourth embodiment;
FIG. 8 is a longitudinal spherical aberration curve, astigmatic curve, and distortion curve of a fourth embodiment;
fig. 9 is a schematic structural view of an optical system of the fifth embodiment;
fig. 10 is a longitudinal spherical aberration curve, astigmatic curve, and distortion curve of the fifth embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The invention provides an optical system, which sequentially comprises from an object side to an image side along an optical axis direction: the first lens element with positive refractive power has a convex object-side surface at a paraxial region; the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a third lens element with positive refractive power; the fourth lens element with refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the fifth lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the sixth lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical system satisfies the relation: 0.2< SD11/ImgH <0.31; the SD11 is half of the maximum effective aperture of the object side surface of the first lens, and the ImgH is the radius of the maximum effective imaging circle of the optical system.
The refractive power of the first lens element to the third lens element of the optical system is designed as above, so that light rays can enter the optical system more easily, aberration is reduced, the subsequent lens group can correct the aberration, and the tolerance sensitivity can be reduced while the optical system is compact in structure by arranging the surface types of the first lens element to the third lens element into the structure. Meanwhile, when the optical system is applied to lens design, the size of the head of the lens can be smaller than that of the tail as much as possible, and the design requirement of the small-head lens can be met. The size of the first lens in the radial direction is reduced, so that the optical system can realize small-head design, and the size of an opening of a screen can be reduced when the optical system is applied to electronic equipment, so that the screen occupation ratio of the equipment can be improved.
In one embodiment, the optical system satisfies the relationship: 1.8mm < ImgH/FNO <2.5mm; wherein FNO is the f-number of the optical system. The optical lens has a large image surface to match a high-pixel photosensitive chip, so that the resolution of an image is improved, and meanwhile, the optical lens has a large aperture, so that the light inlet amount of the optical system is increased. When the relation lower limit is exceeded and the aperture number is fixed, the image height is easy to be insufficient, and the high-pixel photosensitive chip is difficult to match; when the upper limit of the relation is exceeded, the f-number is too small and the aberration is difficult to handle when the image is high.
In one embodiment, the optical system satisfies the relationship: 0.15< CT1/TTL <0.2; wherein, CT1 is the thickness of the first lens element on the optical axis, and TTL is the distance from the object side surface of the first lens element to the image plane on the optical axis. The optical system is provided with the first lens with a thicker center, so that the mechanical bearing position of the first lens can be enabled to move towards the image side fully, when the optical system is applied to lens design, the embedding depth of the lens can be increased, meanwhile, the diameter of the head of the lens can be reduced, the appearance structure of the lens can be optimized, and the design effect of the overall screen can be improved.
In one embodiment, the optical system satisfies the relationship: 0.6mm < ET1<0.9mm; wherein ET1 is the distance from the maximum effective aperture of the object side surface of the first lens to the maximum effective aperture of the image side surface in the optical axis direction. The first lens has larger edge thickness, is beneficial to enlarging the longitudinal depth of the first lens in the optical axis direction, ensures that the lens using the optical system has the characteristic of long head depth, and can be well matched with the lens head control mechanism.
In one embodiment, the optical system satisfies the relationship: 38 ° < HFOV <45 °; wherein the HFOV is one half of the maximum field angle of the optical system. Satisfying the above relation, a lens or an electronic device to which the optical system is applied can be made to have a relatively large angle of view within this range, so that a wider field of view can be photographed. And meanwhile, the size of the first lens is not increased, so that the assembly is easier. Exceeding the upper limit of the relation, the angle of view of the optical system is too large, and the first lens has the risk of increasing the size, which is not beneficial to space utilization; beyond the lower limit of the relation, the angle of view of the optical system is not large enough, and it is difficult to capture a wider field of view.
In one embodiment, the optical system satisfies the relationship: 1.2< TTL/f <1.3; wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the effective focal length of the optical system. The optical system has a balanced size and focal length, i.e. a longer focal length, which is beneficial to taking far scenes, and a smaller total optical length, which reduces the size of the optical system. Exceeding the upper limit of the relation, the total length of the optical system is too long, the optical system is not easy to assemble, or the focal length is too short, so that clear shooting and remote shooting are difficult; beyond the lower limit of the relation, the angle of view of the optical system decreases, and it is difficult to capture a wider scene.
In one embodiment, the optical system satisfies the relationship 8< | (r61+r62)/(r61—r62) | <240; wherein R61 is a radius of curvature of the object-side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image-side surface of the sixth lens element at the optical axis. The curvature radius of the object side surface of the sixth lens element at the optical axis and the curvature radius of the image side surface of the sixth lens element at the optical axis can be properly configured, so that the shape of the sixth lens element is not excessively bent, the astigmatic aberration of the optical system can be corrected, and the sensitivity of the performance change of the optical system can be reduced, thereby being beneficial to improving the yield of products.
In one embodiment, the optical system satisfies the relationship: 2.5< ct6/|sag61| <8; wherein, CT6 is the thickness of the sixth lens element on the optical axis, SAG61 is the sagittal height of the object-side surface of the sixth lens element at the maximum effective half-aperture. The shape of the sixth lens can be well controlled by satisfying the above relation, thereby facilitating the manufacture and molding of the lens and reducing the defect of poor molding. Meanwhile, the field curvature generated by each lens in the object side can be trimmed, so that the balance of the field curvature of the optical system is ensured, namely, the field curvature sizes of different view fields tend to be balanced, so that the picture quality of the whole system picture is uniform, and the imaging quality of the optical system is improved. When CT6/|SAG61| <2.5, the object side surface of the sixth lens element is excessively curved in the surface shape at the circumference, which may cause poor molding and affect the manufacturing yield. When CT6/|SAG61| > 8, the object side surface of the sixth lens element is too smooth at the circumference, and the off-axis visual field light ray has insufficient deflection capability, which is not beneficial to the correction of distortion and field curvature aberration.
In one embodiment, the optical system satisfies the relationship: 1.5< |f56/f12| <6.5; wherein f56 is the combined focal length of the fifth lens and the sixth lens, and f12 is the combined focal length of the first lens and the second lens. The aberration of the front lens group and the aberration of the rear lens group of the optical system are mutually corrected so that the imaging quality of the optical system is stable. And the refractive power distribution of the front lens group and the rear lens group is reasonable, the light transmission is easier, and the improvement of the photosensitive efficiency on the imaging surface is facilitated.
The embodiment of the invention provides a lens module, which comprises the optical system provided by the embodiment of the invention. The lens module can be an imaging module integrated on the electronic equipment or an independent lens. By adding the optical system provided by the invention into the lens module, the lens module has the characteristics of high image quality, small head and high screen ratio by reasonably designing the surface type and the refractive power of each lens in the optical system.
The embodiment of the invention provides electronic equipment, which comprises a shell and a lens module provided by the embodiment of the invention, wherein the lens module is arranged in the shell. Further, the electronic device may further include an electronic photosensitive element, wherein a photosensitive surface of the electronic photosensitive element is located on an imaging surface of the optical system, and light rays of the object incident on the photosensitive surface of the electronic photosensitive element through the lens may be converted into an electrical signal of the image. The electron-sensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a Charge-coupled Device (CCD). The electronic device can be any imaging device with a display screen, such as a smart phone, a notebook computer and the like. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has higher resolution and better imaging quality and higher screen duty ratio.
First embodiment
Referring to fig. 1 and 2, the optical system of the present embodiment includes, in order from an object side to an image side along an optical axis:
the first lens element L1 with positive refractive power has an object-side surface S1 and an image-side surface S2 which are convex at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has an object-side surface S5 and an image-side surface S6 which are convex at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region of the fifth lens element L5.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.
In addition, the optical system further includes a stop STO, an infrared cut filter IR, and an imaging plane IMG. In the present embodiment, the stop STO is provided on the object side of the optical system for controlling the amount of light entering. The infrared cut filter IR is disposed between the sixth lens L6 and the imaging plane IMG, and includes an object side surface S13 and an image side surface S14, and is used for filtering infrared light, so that the light incident on the imaging plane IMG is visible light, and the wavelength of the visible light is 380nm-780nm. The infrared cut filter IR is made of GLASS (GLASS), and can be coated on the GLASS. The first lens L1 to the sixth lens L6 may be made of plastic, glass or glass-plastic composite materials. The effective pixel area of the electronic photosensitive element is positioned on the imaging plane IMG.
Table 1a shows a table of characteristics of the optical system of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are all obtained using visible light having a reference wavelength of 587.56nm, and the Y radius, the thickness, and the effective focal length are all in millimeters (mm).
TABLE 1a
Where f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system.
In the present embodiment, the object-side surface and the image-side surface of the first lens element L1 to the sixth lens element L6 are aspheric, and the aspheric surface profile x can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula. Table 1b shows the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical mirrors S1 and S2 in the first embodiment.
TABLE 1b
Fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical system of the first embodiment at wavelengths 656.2725nm, 587.5618nm, 4618.1227nm, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the normalized field of view, and the longitudinal spherical aberration diagram represents the convergent focus deviation of light rays of different wavelengths after passing through the lenses of the optical system. As can be seen from fig. 2 (a), the spherical aberration value of the optical system in the first embodiment is better, which indicates that the imaging quality of the optical system in the present embodiment is better.
Fig. 2 (b) also shows an astigmatic diagram of the optical system of the first embodiment at a wavelength of 587.5618nm, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height in mm. The astigmatic curve represents the meridional imaging plane curvature T and the sagittal imaging plane curvature S. As can be seen from fig. 2 (b), the astigmatism of the optical system is well compensated.
Fig. 2 (c) also shows a distortion curve of the optical system of the first embodiment at a wavelength of 587.5618 nm. The abscissa along the X-axis direction represents focus shift, the ordinate along the Y-axis direction represents image height, and the distortion curve represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2 (c), the distortion of the optical system is well corrected at a wavelength of 587.5618 nm.
As can be seen from (a), (b) and (c) in fig. 2, the optical system of the present embodiment has smaller aberration, better imaging quality, and good imaging quality.
Second embodiment
Referring to fig. 3 and 4, the optical system of the present embodiment includes, in order from an object side to an image side along an optical axis:
the first lens element L1 with positive refractive power has an object-side surface S1 and an image-side surface S2 which are convex at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a concave object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with positive refractive power has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region of the fifth lens element L5.
The sixth lens element L6 with negative refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.
The other structures of the second embodiment are the same as those of the first embodiment, and reference is made thereto.
Table 2a shows a table of characteristics of the optical system of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are each obtained using visible light having a reference wavelength of 587.56nm, the Y radius, the thickness, and the effective focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.
TABLE 2a
Table 2b gives the higher order coefficients that can be used for each aspherical mirror in the second embodiment, where each aspherical mirror profile can be defined by the formula given in the first embodiment.
TABLE 2b
FIG. 4 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of an optical system of a second embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging focus of light rays of different wavelengths after passing through the lenses of the optical system; astigmatic curves represent meridional imaging surface curvature and sagittal imaging surface curvature; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Third embodiment
Referring to fig. 5 and 6, the optical system of the present embodiment includes, in order from an object side to an image side along an optical axis:
the first lens element L1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with positive refractive power has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region of the fifth lens element L5.
The sixth lens element L6 with negative refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.
The other structures of the third embodiment are the same as those of the first embodiment, and reference is made thereto.
Table 3a shows a table of characteristics of the optical system of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are each obtained using visible light having a reference wavelength of 587.56nm, the Y radius, the thickness, and the effective focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.
TABLE 3a
Table 3b gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the third embodiment, where each of the aspherical surface types can be defined by the formula given in the first embodiment.
TABLE 3b
FIG. 6 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of an optical system of a third embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging focus of light rays of different wavelengths after passing through the lenses of the optical system; astigmatic curves represent meridional imaging surface curvature and sagittal imaging surface curvature; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Fourth embodiment
Referring to fig. 7 and 8, the optical system of the present embodiment includes, in order from an object side to an image side along an optical axis:
the first lens element L1 with positive refractive power has an object-side surface S1 and an image-side surface S2 which are convex at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region.
The fourth lens element L4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region of the fifth lens element L5.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.
The other structures of the fourth embodiment are the same as those of the first embodiment, and reference is made thereto.
Table 4a shows a table of characteristics of the optical system of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are each obtained using visible light having a reference wavelength of 587.56nm, the Y radius, the thickness, and the effective focal length are each in millimeters (mm), and other parameters have the same meaning as those of the first embodiment.
TABLE 4a
Table 4b gives the higher order coefficients that can be used for each aspherical mirror in the fourth embodiment, where each aspherical mirror profile can be defined by the formula given in the first embodiment.
TABLE 4b
Fig. 8 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the fourth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging focus of light rays of different wavelengths after passing through the lenses of the optical system; astigmatic curves represent meridional imaging surface curvature and sagittal imaging surface curvature; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Fifth embodiment
Referring to fig. 9 and 10, the optical system of the present embodiment includes, in order from an object side to an image side along an optical axis:
the first lens element L1 with positive refractive power has an object-side surface S1 and an image-side surface S2 which are convex at a paraxial region.
The second lens element L2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region.
The third lens element L3 with positive refractive power has an object-side surface S5 and an image-side surface S6 which are convex at a paraxial region.
The fourth lens element L4 with negative refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region.
The fifth lens element L5 with negative refractive power has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region of the fifth lens element L5.
The sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region of the sixth lens element L6.
The other structures of the fifth embodiment are the same as those of the first embodiment, and reference is made thereto.
Table 5a shows a table of characteristics of the optical system of the present embodiment, in which the focal length, the refractive index of the material, and the abbe number are each obtained with reference to visible light having a wavelength of 587.56nm, and the Y radius, the thickness, and the effective focal length are each in millimeters (mm), in which the meanings of the other parameters are the same as those of the first embodiment.
TABLE 5a
Table 5b gives the higher order coefficients that can be used for each of the aspherical mirror surfaces in the fifth embodiment, where each of the aspherical surface types can be defined by the formula given in the first embodiment.
TABLE 5b
Fig. 10 shows a longitudinal spherical aberration curve, an astigmatic curve, and a distortion curve of the optical system of the fifth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging focus of light rays of different wavelengths after passing through the respective lenses of the optical system; astigmatic curves represent meridional imaging surface curvature and sagittal imaging surface curvature; the distortion curves represent distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are all well controlled, so that the optical system of this embodiment has good imaging quality.
Table 6 shows values of SD11/ImgH, imgH/FNO, CT1/TTL, ET1, HFOV, TTL/f, | (r61+r62)/(r61—r62) |, CT6/|sag61|, and |f56/f12|, in the optical systems of the first to fifth embodiments.
TABLE 6
| SD11/ImgH | ImgH/FNO(mm) | CT1/TTL | ET1(mm) | HFOV | |
| First embodiment | 0.300 | 2.045 | 0.176 | 0.633 | 38.69° |
| Second embodiment | 0.264 | 1.977 | 0.179 | 0.702 | 39.471° |
| Third embodiment | 0.264 | 1.829 | 0.183 | 0.636 | 40.588° |
| Fourth embodiment | 0.259 | 2.433 | 0.186 | 0.857 | 41.289° |
| Fifth embodiment | 0.274 | 2.327 | 0.176 | 0.866 | 38.546° |
| TTL/f | |(R61+R62)/(R61-R62)| | CT6/|SAG61| | |f56/f12| | ||
| First embodiment | 1.245 | 42.266 | -7.757 | -6.290 | |
| Second embodiment | 1.219 | 8.436 | -2.794 | 6.112 | |
| Third embodiment | 1.253 | -18.773 | -3.917 | -1.729 | |
| Fourth embodiment | 1.261 | -231.824 | -3.993 | -2.216 | |
| Fifth embodiment | 1.231 | 17.472 | -4.525 | -5.857 |
As can be seen from table 6, the optical systems of the first to fifth embodiments all satisfy the following relations: values of 0.2< SD11/ImgH <0.31, 1.8mm < ImgH/FNO <2.5mm, 0.15< CT1/TTL <0.2, 0.6mm < ET1<0.9mm, 38 DEG < HFOV <45 °, 1.2< TTL/f <1.3, 8< | (R61+R62)/(R61-R62) | <240, 2.5< CT6/|SAG61| <8, 1.5< |f56/f12| < 6.5.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, but all or part of the procedures for implementing the above embodiments can be modified by one skilled in the art according to the scope of the appended claims.
Claims (10)
1. An optical system, comprising, in order from an object side to an image side along an optical axis:
a first lens element with positive refractive power having a convex object-side surface at a paraxial region;
a second lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a third lens element with positive refractive power;
a fourth lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
a fifth lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a sixth lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the optical system satisfies the relation: 0.2< SD11/ImgH <0.31;1.2< TTL/f <1.3;
wherein SD11 is half of the maximum effective aperture of the first lens object side surface, imgH is the radius of the maximum effective imaging circle of the optical system, TTL is the distance between the first lens object side surface and the imaging surface on the optical axis, and f is the effective focal length of the optical system.
2. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.8mm<ImgH/FNO<2.5mm；
wherein FNO is the f-number of the optical system.
3. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.15<CT1/TTL<0.2；
wherein, CT1 is the thickness of the first lens element on the optical axis, and TTL is the distance from the object side surface of the first lens element to the imaging surface on the optical axis.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.6mm<ET1<0.9mm；
and ET1 is the distance from the maximum effective caliber of the object side surface of the first lens to the maximum effective caliber of the image side surface in the optical axis direction.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
38°<HFOV<45°；
wherein the HFOV is one half of the maximum field angle of the optical system.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
8<|(R61+R62)/(R61-R62)|<240；
wherein R61 is a radius of curvature of the object-side surface of the sixth lens element at the optical axis, and R62 is a radius of curvature of the image-side surface of the sixth lens element at the optical axis.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
2.5<CT6/|SAG61|<8；
wherein CT6 is the thickness of the sixth lens element on the optical axis, and SAG61 is the sagittal height of the object-side surface of the sixth lens element at the maximum effective half-aperture.
8. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.5<|f56/f12|<6.5；
wherein f56 is a combined focal length of the fifth lens and the sixth lens, and f12 is a combined focal length of the first lens and the second lens.
9. A lens module comprising the optical system according to any one of claims 1 to 8.
10. An electronic device comprising a housing and the lens module of claim 9, the lens module being disposed within the housing.
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