CN113391430A - Optical system, lens module and electronic equipment - Google Patents
Optical system, lens module and electronic equipment Download PDFInfo
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- CN113391430A CN113391430A CN202110577101.5A CN202110577101A CN113391430A CN 113391430 A CN113391430 A CN 113391430A CN 202110577101 A CN202110577101 A CN 202110577101A CN 113391430 A CN113391430 A CN 113391430A
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- 238000003384 imaging method Methods 0.000 claims abstract description 36
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- 230000004075 alteration Effects 0.000 description 37
- 201000009310 astigmatism Diseases 0.000 description 16
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
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- 230000002349 favourable effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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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, the optical system sequentially comprises from an object side to an image side along an optical axis: the first lens element to the sixth lens element with refractive power have positive refractive power, and the second lens element has negative refractive power. The object-side surfaces of the first, second, fifth and sixth lenses and the image-side surface of the fourth lens are all convex at a paraxial region, and the image-side surfaces of the second, fifth and sixth lenses and the object-side surface of the fourth lens are all concave 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 object side surface of the first lens, and ImgH is the radius of the maximum effective imaging circle of the optical system. By reasonably designing the surface shape and the refractive power of each lens of the optical system and enabling the surface shape and the refractive power to satisfy the relational expression, the tolerance sensitivity of the optical system is favorably reduced, the small head design is realized, and the screen occupation ratio of equipment is improved.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to an optical system, a lens module and electronic equipment.
Background
With the development of the photography technology, the current common electronic equipment generally adopts a hole digging design on one side of a display screen to match with a camera, and meanwhile, the bang area is removed to increase the screen occupation ratio of the equipment. For equipment with a screen hole digging design, the structure of the camera lens determines the opening size of the screen to a great extent, and then the screen occupation ratio of the equipment is influenced.
With the continuous update of electronic technology, electronic devices such as smart phones are gradually developed to larger screens and more beautiful, and the demand for screen occupation is gradually increased, but the volume of a conventional lens on the screen of the electronic device cannot be reduced due to the fact that the lens head of the conventional lens is too large. In addition, in the past, the small-head lens often has a larger opening 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 is one of the important points in the industry to design an image pickup lens that can be matched with a display screen to increase the screen ratio of the device, and at the same time, can maintain good image quality and achieve miniaturization.
Disclosure of Invention
The invention aims to provide an optical system, a lens module and an electronic device, which have the characteristics of high image quality, high screen ratio and easiness in miniaturization.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, the present invention provides an optical system, in order from an object side to an image side along an optical axis direction, comprising: a first lens element with positive refractive power having a convex object-side surface at paraxial region; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; 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; SD11 is half of the maximum effective aperture of the object side surface of the first lens, and ImgH is the radius of the maximum effective imaging circle of the optical system.
The refractive power of the first lens to the third lens of the optical system is designed as above, so that light rays can enter the optical system more easily, aberration is reduced, and the subsequent lens group can correct aberration conveniently. Meanwhile, when the optical system is applied to lens design, the size of the head part of the lens can be smaller than that of the tail part of the lens as much as possible, and the design requirement of a small-head lens can be met. Satisfy above-mentioned relational expression, can make and obtain rational configuration between the object side aperture of first lens and optical system's the image plane size, be favorable to reducing first lens in radial ascending size to make optical system realize little head design, and can reduce the trompil size of screen when using optical system to electronic equipment in, and then can improve the screen of equipment and account for than.
In one embodiment, the optical system satisfies the relationship: 1.8mm < ImgH/FNO <2.5 mm; wherein FNO is an f-number of the optical system. The optical system satisfies the relational expression, so that the optical lens has a large image plane to match with a high-pixel photosensitive chip, the image resolution is improved, and meanwhile, the optical lens has a large aperture and the light inlet quantity of the optical system is increased. If the lower limit of the relational expression is exceeded and the f-number is constant, the image height is easy to be insufficient, and the high-pixel photosensitive chip is difficult to match; if the image height is constant, the f-number is too small and the aberration is difficult to handle.
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 the thicker center, so that the mechanical bearing position of the first lens can be moved towards the image side direction fully, when the optical system is applied to the lens design, the embedding depth of the lens is increased, 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-face screen is improved.
In one embodiment, the optical system satisfies the relationship: 0.6mm < ET1<0.9 mm; ET1 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of the first lens. The first lens has larger edge thickness, which is beneficial to increasing the longitudinal depth of the first lens in the optical axis direction, so that the lens using 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 half of a maximum field angle of the optical system. Satisfying the above relational expression, the lens or the electronic apparatus to which the optical system is applied can have a relatively large angle of view within this range, and thus a wider field of view can be photographed. Meanwhile, the size of the first lens is not increased, and the first lens is easier to assemble. Beyond the upper limit of the relation, the field angle of the optical system is too large, and the first lens has the risk of increasing in size and is not favorable for space utilization; if the angle of view of the optical system is larger than the lower limit of the relational expression, the optical system cannot capture a wider field of view.
In one embodiment, the optical system satisfies the relationship: 1.2< TTL/f < 1.3; wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane, and f is an effective focal length of the optical system. Satisfying the above relation, the optical system has balanced size and focal length, namely, a longer focal length is beneficial to shooting distant scenery, and a smaller optical total length is provided, so that the size of the optical system is reduced. Exceeding the upper limit of the relational expression, the total length of the optical system is too long and is not easy to assemble, or the focal length is too short and is difficult to clearly shoot away; if the lower limit of the relational expression is exceeded, the field angle of the optical system is reduced, and a wider scene is difficult to capture.
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 configured properly, so that the shape of the sixth lens element is not too curved, and the astigmatic aberration of the optical system can be corrected while the performance change sensitivity of the optical system can be reduced, thereby facilitating the improvement of the product yield.
In one embodiment, the optical system satisfies the relationship: 2.5< CT6/| SAG61| < 8; wherein CT6 is the thickness of the sixth lens on the optical axis, SAG61 is the sagittal height at the maximum effective half aperture of the object side of the sixth lens. The shape of the sixth lens can be well controlled by satisfying the relational expression, so that the manufacturing and molding of the lens are facilitated, and the defect of poor molding is reduced. Meanwhile, the field curvature generated by each lens of an object space can be trimmed, so that the balance of the field curvature of the optical system is ensured, namely the field curvatures of different fields tend to be balanced, the image quality of the whole system is uniform, and the imaging quality of the optical system is improved. When CT6/| SAG61| <2.5, the surface profile of the object-side surface of the sixth lens at the circumference is excessively curved, which may result in poor molding and affect the manufacturing yield. When CT6/| SAG61| > 8, the surface shape of the object side surface of the sixth lens at the circumference is too smooth, the deflection capability of the light rays of the off-axis field is insufficient, and the correction of distortion and field curvature aberration is 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 optical system can achieve stable imaging quality by mutually correcting the aberration of the front and rear lens groups of the optical system. And the refractive power distribution of the front and rear lens groups is reasonable, the light transmission is easier, and the improvement of the light sensing efficiency on an imaging surface is facilitated.
In a second aspect, the present invention further provides a lens module including the optical system described in 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 shape and the refractive power of each lens in the optical system.
In a third aspect, the present invention further provides an electronic device, which includes a housing and the lens module set in the second aspect, wherein 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 imaging quality and higher screen occupation ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic configuration diagram of an optical system of a first embodiment;
FIG. 2 is a longitudinal spherical aberration curve, an astigmatism curve, and a 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, an astigmatism curve, and a distortion curve of the 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, an astigmatism curve, and a distortion curve of the third embodiment;
fig. 7 is a schematic configuration diagram of an optical system of a fourth embodiment;
FIG. 8 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the fourth embodiment;
fig. 9 is a schematic configuration diagram of an optical system of the fifth embodiment;
fig. 10 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the fifth embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides an optical system, comprising in order from an object side to an image side along an optical axis: the first lens element with positive refractive power has a convex object-side surface at paraxial region; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; 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 and a concave image-side surface; 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 object side surface of the first lens, and ImgH is the radius of the maximum effective imaging circle of the optical system.
The refractive power of the first lens to the third lens of the optical system is designed as above, so that light rays can enter the optical system more easily, aberration is reduced, and the subsequent lens group can correct aberration conveniently. Meanwhile, when the optical system is applied to lens design, the size of the head part of the lens can be smaller than that of the tail part of the lens as much as possible, and the design requirement of a small-head lens can be met. Satisfy above-mentioned relational expression, can make and obtain rational configuration between the object side aperture of first lens and optical system's the image plane size, be favorable to reducing first lens in radial ascending size to make optical system realize little head design, and can reduce the trompil size of screen when using optical system to electronic equipment in, and then can improve the screen of equipment and account for than.
In one embodiment, the optical system satisfies the relationship: 1.8mm < ImgH/FNO <2.5 mm; wherein FNO is the f-number of the optical system. The optical lens can have a large image plane to match with a high-pixel photosensitive chip, so that the image resolution is improved, and meanwhile, the optical lens has a large aperture and the light incoming amount of the optical system is increased. If the lower limit of the relational expression is exceeded and the f-number is constant, the image height is easy to be insufficient, and the high-pixel photosensitive chip is difficult to match; if the image height is constant, the f-number is too small and the aberration is difficult to handle.
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 the thicker center, so that the mechanical bearing position of the first lens can be moved towards the image side direction fully, when the optical system is applied to the lens design, the embedding depth of the lens can be deepened, 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 full-face screen can be improved.
In one embodiment, the optical system satisfies the relationship: 0.6mm < ET1<0.9 mm; ET1 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of the first lens. Satisfying the above relation, the first lens has a larger edge thickness, which is beneficial to increasing 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 the lens head control mechanism.
In one embodiment, the optical system satisfies the relationship: 38 ° < HFOV <45 °; the HFOV is a half of the maximum field angle of the optical system. Satisfying the above relational expression, the lens or the electronic apparatus to which the optical system is applied can have a relatively large angle of view in this range, and a wider field of view can be photographed. Meanwhile, the size of the first lens cannot be increased, and the first lens is easier to assemble. If the upper limit of the relational expression is exceeded, the field angle of the optical system is too large, and the first lens risks increasing in size and is not favorable for space utilization; if the angle of view of the optical system exceeds the lower limit of the relational expression, the angle of view 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 a distance on the optical axis from the object-side surface of the first lens element to the image plane, and f is an effective focal length of the optical system. Satisfying the above relation, the optical system has balanced size and focal length, namely, a longer focal length is beneficial to shooting distant scenery, and a smaller optical total length is provided, thereby reducing the size of the optical system. Exceeding the upper limit of the relational expression, the total length of the optical system is too long and is not easy to assemble, or the focal length is too short and is difficult to clearly shoot away; if the lower limit of the relational expression is exceeded, the field angle of the optical system is reduced, and a wider scene is difficult to capture.
In one embodiment, the optical system satisfies the relationship 8< | (R61+ R62)/(R61-R62) | < 240; wherein, R61 is the curvature radius of the object-side surface of the sixth lens element on the optical axis, and R62 is the curvature radius of the image-side surface of the sixth lens element on the optical axis. The curvature radius of the object side surface of the sixth lens at the optical axis and the curvature radius of the image side surface of the sixth lens at the optical axis can be configured properly, so that the shape of the sixth lens is not excessively bent, the astigmatic aberration of the optical system is corrected, the performance change sensitivity of the optical system can be reduced, and the product yield is improved.
In one embodiment, the optical system satisfies the relationship: 2.5< CT6/| SAG61| < 8; wherein CT6 is the thickness of the sixth lens on the optical axis, and SAG61 is the sagittal height at the maximum effective half aperture of the object side of the sixth lens. Satisfying the above relational expression, the shape of the sixth lens can be well controlled, thereby facilitating the manufacture and molding of the lens and reducing the defect of poor molding. Meanwhile, the field curvature generated by each lens of an object space can be trimmed, so that the balance of the field curvature of the optical system is ensured, namely the field curvatures of different fields tend to be balanced, the image quality of the whole system is uniform, and the imaging quality of the optical system is improved. When CT6/| SAG61| <2.5, the surface profile of the object-side surface of the sixth lens at the circumference is excessively curved, which may result in poor molding and affect the manufacturing yield. When CT6/| SAG61| > 8, the surface shape of the object side surface of the sixth lens at the circumference is too smooth, the deflection capability of the light rays of the off-axis field is insufficient, and the correction of distortion and field curvature aberration is not facilitated.
In one embodiment, the optical system satisfies the relationship: 1.5< | f56/f12| < 6.5; where 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 and rear lens groups of the optical system is mutually corrected so as to ensure stable imaging quality of the optical system. And the refractive power distribution of the front and rear lens groups is reasonable, the light transmission is easier, and the improvement of the light sensing efficiency on an 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, and can also be 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 shape 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. Furthermore, the electronic device may further include an electronic photosensitive element, a photosensitive surface of the electronic photosensitive element is located on an imaging surface of the optical system, and light rays of an object incident on the photosensitive surface of the electronic photosensitive element through the lens may be converted into an electrical signal of an image. The electron sensor may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The electronic equipment can be any imaging equipment 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 imaging quality and higher screen occupation ratio.
First embodiment
Referring to fig. 1 and fig. 2, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with positive refractive power has a convex object-side surface S1 and an convex image-side surface S2 at paraxial region of the first lens element L1.
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 of the second lens element L2.
The third lens element L3 with positive refractive power has a convex object-side surface S5 and an convex image-side surface S6 at paraxial region of the third lens element L3.
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 of the fourth lens element L4.
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.
Further, the optical system includes a stop STO, an infrared cut filter IR, and an imaging surface IMG. In this 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 surface IMG, and includes an object side surface S13 and an image side surface S14, and is configured to filter infrared light, so that the light incident on the imaging surface IMG is visible light with a wavelength of 380nm to 780 nm. The material of the infrared cut filter IR is GLASS (GLASS), and the GLASS can be coated with a film. The first lens L1 to the sixth lens L6 may be made of plastic, glass, or a mixture of glass and plastic. The effective pixel area of the electronic photosensitive element is positioned on the imaging surface IMG.
Table 1a shows a table of characteristics of the optical system of the present embodiment in which the focal length, the material refractive index, and the abbe number are all obtained using visible light having a reference wavelength of 587.56nm, and the units of the Y radius, the thickness, and the effective focal length are all millimeters (mm).
TABLE 1a
Wherein 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 through the sixth lens element L6 are aspheric surfaces, and the aspheric surface x can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula. Table 1b shows the high-order term 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 curve of the optical system of the first embodiment at wavelengths of 656.2725nm, 587.5618nm, and 4618.1227nm, in which the abscissa in the X-axis direction represents the focus offset, the ordinate in the Y-axis direction represents the normalized field of view, and the longitudinal spherical aberration curve represents the convergent focus offset of light rays of different wavelengths after passing through the respective 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 illustrates that the imaging quality of the optical system in this embodiment is better.
Fig. 2 (b) also shows an astigmatism graph 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 astigmatism curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S. As can be seen from (b) of fig. 2, 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 the focus offset, the ordinate along the Y-axis direction represents the image height, and the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from (c) in fig. 2, 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 small aberration, good imaging quality, and good imaging quality.
Second embodiment
Referring to fig. 3 and 4, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with positive refractive power has a convex object-side surface S1 and an convex image-side surface S2 at paraxial region of the first lens element L1.
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 of the second lens element L2.
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 of the third lens element L3.
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 of the fourth lens element L4.
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.
Other structures of the second embodiment are the same as those of the first embodiment, and reference may be made thereto.
Table 2a shows a table of characteristics of the optical system of the present embodiment in which the focal length, the material refractive index, and the abbe number are all obtained using visible light having a reference wavelength of 587.56nm, and the units of the Y radius, the thickness, and the effective focal length are all millimeters (mm), and the other parameters have the same meanings as those of the first embodiment.
TABLE 2a
Table 2b gives the coefficients of high order terms that can be used for each aspherical mirror in the second embodiment, wherein each aspherical mirror type can be defined by the formula given in the first embodiment.
TABLE 2b
FIG. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the second embodiment, wherein the longitudinal spherical aberration curve represents the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the 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 well controlled, so that the optical system of this embodiment has good imaging quality.
Third embodiment
Referring to fig. 5 and fig. 6, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
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 of the first lens element L1.
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 of the second lens element L2.
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 of the third lens element L3.
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 of the fourth lens element L4.
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.
Other structures of the third embodiment are the same as those of the first embodiment, and reference may be made thereto.
Table 3a shows a table of characteristics of the optical system of the present embodiment in which the focal length, the material refractive index, and the abbe number are all obtained using visible light having a reference wavelength of 587.56nm, and the units of the Y radius, the thickness, and the effective focal length are all millimeters (mm), and the other parameters have the same meanings as those of the first embodiment.
TABLE 3a
Table 3b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 3b
FIG. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the 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 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, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with positive refractive power has a convex object-side surface S1 and an convex image-side surface S2 at paraxial region of the first lens element L1.
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 of the second lens element L2.
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 of the third lens element L3.
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 of the fourth lens element L4.
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.
Other structures of the fourth embodiment are the same as those of the first embodiment, and reference may be made thereto.
Table 4a shows a table of characteristics of the optical system of the present embodiment in which the focal length, the material refractive index, and the abbe number are all obtained using visible light having a reference wavelength of 587.56nm, and the units of the Y radius, the thickness, and the effective focal length are all millimeters (mm), and the other parameters have the same meanings as those of the first embodiment.
TABLE 4a
Table 4b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4b
FIG. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fourth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the 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 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, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with positive refractive power has a convex object-side surface S1 and an convex image-side surface S2 at paraxial region of the first lens element L1.
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 of the second lens element L2.
The third lens element L3 with positive refractive power has a convex object-side surface S5 and an convex image-side surface S6 at paraxial region of the third lens element L3.
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 of the fourth lens element L4.
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 structure of the fifth embodiment is the same as that of the first embodiment, and reference may be made thereto.
Table 5a shows a table of characteristics of the optical system of the present embodiment in which the focal length, the material refractive index, and the abbe number are obtained with reference to visible light having a wavelength of 587.56nm, and the units of the Y radius, the thickness, and the effective focal length are all millimeters (mm), wherein the other parameters have the same meanings as those of the first embodiment.
TABLE 5a
Table 5b shows the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 5b
FIG. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fifth embodiment, wherein the longitudinal spherical aberration curves represent convergent focus deviations of light rays of different wavelengths after passing through respective lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the 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 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|, | 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: 0.2< SD11/ImgH <0.31, 1.8mm < ImgH/FNO <2.5mm, 0.15< CT1/TTL <0.2, 0.6mm < ET1<0.9mm, 38 ° < HFOV <45 °, 1.2< TTL/f <1.3, 8< | (R61+ R62)/(R61-R62) | <240, 2.5< CT6/| SAG61| <8, 1.5 | <f 56/f12| < 6.5.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (11)
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 paraxial region;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
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;
SD11 is half of the maximum effective aperture of the object side surface of the first lens, and ImgH is the radius of the maximum effective imaging circle 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 an 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 image plane on the optical axis.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.6mm<ET1<0.9mm；
ET1 is the distance in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of the first lens.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
38°<HFOV<45°；
wherein the HFOV is half of a maximum field angle of the optical system.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
1.2<TTL/f<1.3；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane, and f is an effective focal length of the optical system.
7. 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.
8. 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 on the optical axis, SAG61 is the sagittal height at the maximum effective half aperture of the object side of the sixth lens.
9. 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.
10. A lens module comprising the optical system of any one of claims 1 to 9.
11. An electronic apparatus, characterized in that the electronic apparatus comprises a housing and the lens module according to claim 10, the lens module being disposed in the housing.
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