CN111323891A - Optical assembly, image capturing module and mobile terminal - Google Patents
Optical assembly, image capturing module and mobile terminal Download PDFInfo
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- CN111323891A CN111323891A CN201811536982.0A CN201811536982A CN111323891A CN 111323891 A CN111323891 A CN 111323891A CN 201811536982 A CN201811536982 A CN 201811536982A CN 111323891 A CN111323891 A CN 111323891A
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- 238000010586 diagram Methods 0.000 description 31
- 230000004075 alteration Effects 0.000 description 22
- 238000013461 design Methods 0.000 description 16
- 201000009310 astigmatism Diseases 0.000 description 15
- 239000011521 glass Substances 0.000 description 7
- 230000002452 interceptive effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
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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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to an optical assembly, an image capturing module and a mobile terminal. The optical assembly comprises the following components in sequence from an object side to an image side: a diaphragm; the optical lens assembly comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, a sixth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a sixth; a second lens element with refractive power having a convex object-side surface and a concave image-side surface; a third lens element with refractive power; a fourth lens element with positive refractive power having a convex image-side surface; the fifth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at an optical axis, the object-side surface and the image-side surface of the fifth lens element are aspheric, and the image-side surface is provided with at least one inflection point; when the optical component meets the range of f/f123, the imaging quality and the total compression length can be improved, so that the miniaturization is realized; f is the focal length of the optical assembly, and f123 is the combined focal length of the first, second and third lenses.
Description
Technical Field
The present invention relates to the field of optical imaging, and in particular, to an optical assembly, an image capturing module and a mobile terminal.
Background
In recent years, with the rise of electronic products such as smart phones, mobile phones, and tablet computers, pixels of camera modules mounted thereon have been increasing. The photosensitive elements of a typical optical system are not limited to a Charge Coupled Device (CCD) or a complementary Metal-oxide semiconductor (CMOS) Sensor. With the development of chip technologies such as CCD or CMOS, the pixel size of the chip becomes smaller and smaller, and the imaging lens module gradually tends to be developed in the high pixel field.
The traditional camera lens carried on the portable electronic product mostly adopts three-piece type and four-piece type lens systems, and along with the progress of the module end manufacturing technology, the requirement on the resolution ratio of the lens is increasingly improved, so that the optical system develops towards the direction of large imaging area, and further, five-piece type lens systems are provided to meet the requirement of a higher-order camera module; while the conventional five-piece design is used to carry a high-pixel photosensitive chip to obtain a high-quality image, the volume is relatively large, and the demand for increasingly thinner and lighter portable electronic products cannot be met. In order to flexibly mount a thin and light mobile terminal such as a smart phone and a tablet computer, a camera lens with high imaging quality and miniaturization is urgently needed.
Disclosure of Invention
Accordingly, it is desirable to provide an optical assembly, an image capturing module and a mobile terminal, which are suitable for both high imaging quality and miniaturization.
An optical assembly comprising, in order from an object side to an image side:
a diaphragm;
the optical lens assembly comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a sixth lens element with negative refractive power, a sixth lens element with positive refractive power;
a second lens element with refractive power having a convex object-side surface and a concave image-side surface;
a third lens element with refractive power;
a fourth lens element with positive refractive power having a convex image-side surface;
the optical axis of the fifth lens element is concave, the object-side surface and the image-side surface of the fifth lens element are aspheric, and the image-side surface of the fifth lens element is provided with at least one inflection point;
the optical assembly satisfies the following relation:
0.8<f/f123<1.2；
wherein f is a focal length of the optical assembly, and f123 is a composite focal length of the first lens, the second lens and the third lens. When the total length of the optical assembly is larger than the upper limit, the positive refractive power of the first lens is weakened, the combined power is reduced, and the focal length of the optical assembly is lengthened, so that the total length of the optical assembly is not favorably compressed, and the optical assembly is larger in volume; when the refractive power is lower than the lower limit, the positive refractive power of the first lens element is too strong, and the second lens element and the third lens element have difficulty in correcting chromatic aberration and astigmatism, thereby degrading the imaging quality. When the above relationship is satisfied, the first lens element provides most of positive refractive power, and at least one of the second lens element and the third lens element provides negative refractive power for compensation, so as to correct part of aberration and improve imaging quality. Meanwhile, reasonably configuring the relationship between the focal length of the optical component and the resultant focal length in the above range will help to compress the overall length of the optical component, thereby achieving a compact design.
In one embodiment, the optical assembly satisfies the following relationship:
1.2<EPD/R1<1.8；
where EPD is the entrance pupil aperture of the optical assembly and R1 is the radius of curvature of the object-side surface of the first lens. When the above relation is satisfied, the reduction of the incident light angle can be avoided, and the larger aperture provides better relative illumination, so as to achieve ultrahigh resolution.
In one embodiment, the optical assembly satisfies the following relationship:
0≤|SAG41|/|SAG31|≤105；
SAG31 is the distance on the optical axis from the intersection point of the object-side surface of the third lens to the vertex of the effective radius of the object-side surface of the third lens, and SAG41 is the distance on the optical axis from the intersection point of the object-side surface of the fourth lens to the vertex of the effective radius of the object-side surface of the fourth lens. When the relation is satisfied, the bending degree of the third lens and the fourth lens can be reasonably controlled, the sensitivity of the optical assembly is reduced, the production and the processing are facilitated, and the molding uniformity of the lenses is improved.
In one embodiment, the optical assembly satisfies the following relationship:
0.6<SD52/ImgH<0.9；
wherein SD52 is the effective half aperture of the image side surface of the fifth lens, and ImgH is the maximum imaging height of the optical assembly. When the relation is met, the caliber of the fifth lens can be controlled, the phenomenon that the caliber is too large is avoided, a modulation transfer function with a good external view field can be obtained, the generation of a dark corner is avoided, and the requirement for miniaturization can be met.
In one embodiment, the optical assembly satisfies the following relationship:
TTL/f1≤1.5；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical assembly, and f1 is a focal length of the first lens element. When the above relation is satisfied, it is possible to avoid that the spherical aberration is hard to correct due to the excessive refractive power of the first lens element, and to configure sufficient refractive power to reduce the total length of the optical assembly, thereby achieving miniaturization.
In one embodiment, the optical assembly satisfies the following relationship:
0.165(1/mm)≤[tan(HFOV)]/f≤0.240(1/mm)；
wherein f is a focal length of the optical assembly and the HFOV is half of a maximum field angle of the optical assembly. When [ tan (HFOV) ]/f is less than 0.165, the optical component provides a smaller field angle when matched with a chip with the same specification; when [ tan (HFOV) ]/f >0.24, a large viewing angle is satisfied, and simultaneously, poor surface shape configuration is caused due to over-compression of the focal length of the optical component, so that problems of field curvature and distortion are caused; when the above relationship is satisfied, the optical assembly has a characteristic of a larger viewing angle, and can reasonably and effectively shorten the focal length, maintain excellent imaging quality, and thus contribute to a miniaturized design.
In one embodiment, the optical assembly satisfies the following relationship:
SD21/SD11≤1；
wherein SD21 is the effective half aperture of the object-side surface of the second lens and SD11 is the effective half aperture of the object-side surface of the first lens. When the above relationship is satisfied, the optical component has a miniaturization characteristic.
In one embodiment, the optical assembly satisfies the following relationship:
1.4<Nd2<1.7；
1.4<Nd3<1.7；
wherein Nd2 is a refractive index of the second lens, and Nd3 is a refractive index of the third lens. When the above relation is satisfied, it is helpful to correct chromatic aberration and astigmatism of the optical lens group, and improve resolving power, thereby having higher imaging quality.
An image capturing module comprises a photosensitive element and the optical assembly in any one of the embodiments, wherein the photosensitive element is arranged on an imaging surface of the optical assembly.
By adopting the optical assembly of any one of the above embodiments, the image capturing module can effectively shorten the length of the image capturing module in the optical axis direction when carrying the high-pixel photosensitive element to obtain an imaging picture with high imaging quality, thereby realizing a miniaturized design.
A mobile terminal comprises a shell and the image capturing module in the embodiment, wherein the image capturing module is arranged on the shell.
Drawings
FIG. 1 is a schematic view of an optical assembly according to a first embodiment of the present invention;
fig. 2 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
FIG. 3 is a schematic view of an optical assembly according to a second embodiment of the present invention;
FIG. 4 is a spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);
FIG. 5 is a schematic view of an optical assembly according to a third embodiment of the present invention;
FIG. 6 is a spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) -of the optical assembly in the third embodiment;
FIG. 7 is a schematic view of an optical assembly according to a fourth embodiment of the present invention;
FIG. 8 is a spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%);
FIG. 9 is a schematic view of an optical assembly provided in a fifth embodiment of the present invention;
fig. 10 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 11 is a schematic view of an image capturing module according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a mobile terminal according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the optical assembly 10 includes, in order from an object side to an image side, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2, a third lens element L3, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power.
The first lens element L1 includes an object-side surface S2 and an image-side surface S3, wherein the object-side surface S2 is convex, the image-side surface S3 is concave at the optical axis, and convex at the circumference; the second lens element L2 includes an object-side surface S4 and an image-side surface S5, wherein the object-side surface S4 is convex and the image-side surface S5 is concave; the third lens L3 includes an object-side surface S6 and an image-side surface S7; the fourth lens element L4 includes an object-side surface S8 and an image-side surface S9, wherein the image-side surface S9 is convex; the fifth lens element L5 includes an object-side surface S10 and an image-side surface S11, the object-side surface S10 is concave along an optical axis, convex along a circumference, the image-side surface S11 is concave along the optical axis, and convex along the circumference, the object-side surface S10 and the image-side surface S11 of the fifth lens element L5 are aspheric, and the image-side surface S11 includes at least one inflection point. In addition, the optical assembly 10 further includes an image plane S14, and the image plane S14 is located on the image side of the fifth lens element L5.
In addition, by providing the stop ST0 on the object side of the first lens L1, the exit pupil can be made distant from the imaging plane, and the effective diameter of the optical unit 10 can be reduced without reducing the telecentricity of the optical unit 10, thereby achieving downsizing. In some embodiments, the stop ST0 is fixed to the first lens L1, so that the volume of the optical assembly 10 can be reduced and a miniaturized design can be achieved.
In some embodiments, an infrared filter L6 is further disposed between the fifth lens element L5 and the image plane S14, the infrared filter L6 includes an object-side surface S12 and an image-side surface S13, and the infrared filter L6 is made of glass. The infrared filter L6 is used to adjust the wavelength range of the light to be imaged, specifically to isolate infrared light, and prevent the infrared light from entering the imaging plane S14, thereby preventing the infrared light from affecting the color and definition of the normal image, and improving the imaging effect of the optical assembly 10 in the daytime.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, so that the optical assembly 10 can reduce weight and cost. In other embodiments, the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are made of glass, and the optical assembly 10 can withstand higher temperatures.
In some embodiments, the optical assembly 10 satisfies the following relationship:
0.8<f/f123<1.2；
where f is the focal length of the optical assembly 10, and f123 is the combined focal length of the first lens element L1, the second lens element L2, and the third lens element L3. In some embodiments, the relationship of f/f123 may be 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, or 1.18. Above the upper limit, the positive refractive power of the first lens element L1 becomes weaker, the combined power becomes smaller, and the focal length of the optical assembly 10 becomes longer, which is detrimental to the overall length compression of the optical assembly 10, resulting in a larger volume of the optical assembly 10; if the refractive power is lower than the lower limit, the positive refractive power of the first lens element L1 is too strong, and it becomes difficult to correct chromatic aberration and astigmatism of the second lens element L2 and the third lens element L3, thereby degrading image quality. When the above relationship is satisfied, the first lens element L1 provides most of positive refractive power, and at least one of the second lens element L2 and the third lens element L3 provides negative refractive power for compensation, so as to correct part of the aberration and improve the imaging quality. Meanwhile, properly configuring the relationship between the focal length of the optical component 10 and the resultant focal length in the above range will help to compress the overall length of the optical component 10, thereby achieving a compact design.
In some embodiments, the optical assembly 10 satisfies the following relationship:
1.2<EPD/R1<1.8；
where EPD is the entrance pupil aperture of the optical assembly 10, and R1 is the radius of curvature of the object-side surface of the first lens L1. In some embodiments, the EPD/R1 relationship may be 1.25, 1.35, 1.40, 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, or 1.75. When the above relation is satisfied, the reduction of the incident light angle can be avoided, and the larger aperture provides better relative illumination, so as to achieve ultrahigh resolution.
In some embodiments, the optical assembly 10 satisfies the following relationship:
0≤|SAG41|/|SAG31|≤105；
SAG31 is the distance on the optical axis from the intersection point of the optical axis of the object-side surface S6 of the third lens L3 to the vertex of the effective radius of the object-side surface S6 of the third lens L3, and SAG41 is the distance on the optical axis from the intersection point of the optical axis of the object-side surface S8 of the fourth lens L4 to the vertex of the effective radius of the object-side surface S8 of the fourth lens L4. In some embodiments, the relationship of i SAG41 i/i SAG31 i may be 1.50, 2.00, 2.50, 3.00, 12.00, 13.00, 13.50, 14.00, 102.00, 102.50, 103.00, 103.50, or 104.00. When the relational expression is satisfied, the bending degree of the third lens L3 and the fourth lens L4 can be reasonably controlled, the sensitivity of the optical assembly 10 is reduced, the production and the processing are facilitated, and the molding uniformity of the lenses is improved.
In some embodiments, the optical assembly 10 satisfies the following relationship:
0.6<SD52/ImgH<0.9；
where SD52 is the effective half aperture of the image side S11 of the fifth lens L5, and ImgH is the maximum imaging height of the optical assembly 10. In some embodiments, the relationship of SD52/ImgH may be 0.65, 0.70, 0.75, 0.80, 0.85, or 0.88. When the above relation is satisfied, the aperture of the fifth lens L5 can be controlled, and an excessively large aperture is avoided, and at this time, a modulation transfer function with a good external view field can be obtained, so that a dark corner is avoided, and the demand for miniaturization can be satisfied.
In some embodiments, the optical assembly 10 satisfies the following relationship:
TTL/f1≤1.5；
wherein, TTL is an axial distance from the object-side surface S2 of the first lens element L1 to the image plane S14, and f1 is a focal length of the first lens element L1. In some embodiments, the TTL/f1 relationship can be 0.50, 0.75, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, or 1.48. When the above relation is satisfied, the refractive power of the first lens element L1 is too large to correct the spherical aberration, and sufficient refractive power is provided to reduce the total length of the optical element 10, thereby achieving miniaturization.
In some embodiments, the optical assembly 10 satisfies the following relationship:
0.165(1/mm)≤[tan(HFOV)]/f≤0.240(1/mm)；
where f is the focal length of the optical assembly 10 and the HFOV is half of the maximum field angle of the optical assembly 10. In some embodiments, the relationship of [ tan (hfov) ]/f can be 0.166(1/mm), 0.168(1/mm), 0.173(1/mm), 0.178(1/mm), 0.180(1/mm), 0.184(1/mm), 0.187(1/mm), 0.195(1/mm), 0.201(1/mm), 0.210(1/mm), 0.220(1/mm), 0.224(1/mm), 0.228(1/mm), 0.230(1/mm), 0.234(1/mm), or 0.238 (1/mm). When [ tan (HFOV) ]/f is less than 0.165, the optical component 10 provides a smaller field angle when matched with a chip with the same specification; when [ tan (hfov) ]/f >0.24, a large viewing angle is satisfied, and at the same time, the optical assembly 10 is compressed excessively in focal length to cause poor surface shape configuration, which causes problems of curvature of field and distortion; when the above relationship is satisfied, the optical assembly 10 has a characteristic of a large viewing angle, and can reasonably and effectively shorten the focal length and maintain excellent imaging quality, thereby contributing to a miniaturized design.
In some embodiments, the optical assembly 10 satisfies the following relationship:
SD21/SD11≤1；
wherein SD21 is the effective half aperture of the object-side surface S4 of the second lens L2, and SD11 is the effective half aperture of the object-side surface S2 of the first lens L1. In some embodiments, the relationship of SD21/SD11 may be 0.50, 0.60, 0.70, 0.80, 0.85, 0.89, 0.92, 0.95, 0.97, 0.98, or 0.99. When the above relationship is satisfied, the optical component 10 has a miniaturization characteristic.
In some embodiments, the optical assembly 10 satisfies the following relationship:
1.4<Nd2<1.7；
1.4<Nd3<1.7；
where Nd2 is the refractive index of the second lens L2, and Nd3 is the refractive index of the third lens L3. In some embodiments, Nd2 may be 1.45, 1.50, 1.55, 1.60, or 1.65; nd3 may be 1.45, 1.50, 1.55, 1.60 or 1.65. When the above relationship is satisfied, it is helpful to correct chromatic aberration and astigmatism of the optical assembly 10, improve resolving power, and thus have higher imaging quality.
The aspherical surface type formulas of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is a conic constant, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula.
First embodiment
In the first embodiment as shown in fig. 1, the optical assembly 10 includes, in order from an object side to an image plane, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. Fig. 2 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical assembly 10 in the first embodiment.
The object-side surface S2 of the first lens element L1 is convex along the optical axis, and the image-side surface S3 of the first lens element L1 is concave along the optical axis; the object-side surface S2 of the first lens element L1 is convex at the circumference, and the image-side surface S3 of the first lens element L1 is convex at the circumference. The object-side surface S4 of the second lens element L2 is convex along the optical axis, and the image-side surface S5 of the second lens element L2 is concave along the optical axis; the object-side surface S4 of the second lens element L2 is convex at the circumference, and the image-side surface S5 of the second lens element L2 is concave at the circumference. The object-side surface S6 of the third lens element L3 is convex along the optical axis, and the image-side surface S7 of the third lens element L3 is convex along the optical axis; the object-side surface S6 of the third lens element L3 is concave at the circumference, and the image-side surface S7 of the third lens element L3 is convex at the circumference. The object-side surface S8 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S9 of the fourth lens element L4 is convex along the optical axis; the object-side surface S8 of the fourth lens element L4 is concave at the circumference, and the image-side surface S9 of the fourth lens element L4 is convex at the circumference. The object-side surface S10 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S11 of the fifth lens element L5 is concave along the optical axis; the object-side surface S10 of the fifth lens element L5 is convex at the circumference, and the image-side surface S11 of the fifth lens element L5 is convex at the circumference.
The object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric, so that the problem of distortion of the field of view can be solved due to the aspheric design, and the optical element 10 can be thinner and thinner due to the excellent optical effect of the smaller, thinner and flatter lens elements.
In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, and the use of the plastic material can reduce the weight of the optical assembly 10 and reduce the cost.
As shown in fig. 1, in the first embodiment, the optical assembly 10 is further provided with an infrared filter L6 made of glass, and the infrared filter L6 can isolate infrared light, so as to prevent the infrared light from interfering with imaging, thereby improving the imaging performance of the optical assembly 10.
In particular, the optical assembly 10 also satisfies the following relationship:
f/f123＝1.04；
where f is the focal length of the optical assembly 10, and f123 is the combined focal length of the first lens element L1, the second lens element L2, and the third lens element L3. When f/f123 is equal to 1.04, the first lens element L1 can provide most of the positive refractive power, and it is known to those skilled in the art that spherical aberration is one of the main factors that limit the resolution of the lens system, where the compensation of the negative refractive power of the second lens element L2 is reasonably introduced to effectively balance the spherical aberration and improve the imaging quality, and then the optical assembly 10 can have better ability of balancing the curvature of field by reasonably configuring the focal length of the optical assembly 10, which is helpful to compress the total length of the optical assembly 10 and satisfy the miniaturization design.
The optical assembly 10 satisfies the following relationship:
EPD/R1＝1.45
where EPD is the entrance pupil aperture of the optical assembly 10, and R1 is the radius of curvature of the object-side surface of the first lens L1. When the above relation is satisfied, the reduction of the incident light angle can be avoided, and the larger aperture provides better relative illumination, so as to achieve ultrahigh resolution.
The optical assembly 10 satisfies the following relationship:
|SAG41|/|SAG31|＝13.26；
SAG31 is the distance on the optical axis from the intersection point of the optical axis of the object-side surface S6 of the third lens L3 to the vertex of the effective radius of the object-side surface S6 of the third lens L3, and SAG41 is the distance on the optical axis from the intersection point of the optical axis of the object-side surface S8 of the fourth lens L4 to the vertex of the effective radius of the object-side surface S8 of the fourth lens L4. When the relational expression is satisfied, the bending degree of the third lens L3 and the fourth lens L4 can be reasonably controlled, the sensitivity of the optical assembly 10 is reduced, the production and the processing are facilitated, and the molding uniformity of the lenses is improved.
The optical assembly 10 satisfies the following relationship:
SD52/ImgH＝0.67；
where SD52 is the effective half aperture of the image side S11 of the fifth lens L5, and ImgH is the maximum imaging height of the optical assembly 10. When the above relation is satisfied, the aperture of the fifth lens L5 can be controlled, and an excessively large aperture is avoided, and at this time, a modulation transfer function with a good external view field can be obtained, so that a dark corner is avoided, and the demand for miniaturization can be satisfied.
The optical assembly 10 satisfies the following relationship:
TTL/f1＝1.27；
wherein, TTL is an axial distance from the object-side surface S2 of the first lens element L1 to the image plane S14, and f1 is a focal length of the first lens element L1. When the above relation is satisfied, the refractive power of the first lens element L1 is too large to correct the spherical aberration, and sufficient refractive power is provided to reduce the total length of the optical element 10, thereby achieving miniaturization.
The optical assembly 10 satisfies the following relationship:
[tan(HFOV)]/f＝0.199(1/mm)；
where f is the focal length of the optical assembly 10 and the HFOV is half of the maximum field angle of the optical assembly 10. When the above relationship is satisfied, the optical assembly 10 has a characteristic of a large viewing angle, and can reasonably and effectively shorten the focal length and maintain excellent imaging quality, thereby contributing to a miniaturized design.
The optical assembly 10 satisfies the following relationship:
SD21/SD11＝0.91；
wherein SD21 is the effective half aperture of the object-side surface S4 of the second lens L2, and SD11 is the effective half aperture of the object-side surface S2 of the first lens L1. When the above relationship is satisfied, the optical component 10 has a miniaturization characteristic.
The optical assembly 10 satisfies the following relationship:
Nd2＝1.66；
Nd3＝1.54；
where Nd2 is the refractive index of the second lens L2, and Nd3 is the refractive index of the third lens L3. When the above relationship is satisfied, it is helpful to correct chromatic aberration and astigmatism of the optical assembly 10, and improve resolving power, thereby achieving a higher pixel.
In the first embodiment, the effective focal length f of the optical assembly 10 is 3.97mm, the f-number is 2.10, half of the maximum field angle is HFOV 38.3 degrees, and the distance from the object-side surface S2 of the first lens L1 to the image plane S14 on the optical axis is TTL 4.24 mm.
In addition, the parameters of the optical assembly 10 are given in tables 1 and 2. The elements from the object plane to the image plane S14 were arranged in the order of the elements from top to bottom in table 1. The radius Y in table 1 is a radius of curvature. The surface numbers 2 and 3 are the object-side surface S2 and the image-side surface S3 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The first value in the "thickness" parameter list of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element along the optical axis. In addition, the value of the object plane corresponding to the plane number 0 in the "thickness" parameter is the distance from the object to the diaphragm ST0, and in other embodiments, the distance from the object to the diaphragm ST0 may also be 470mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 2000mm, 5000mm, or infinity. The value corresponding to the plane number 13 in the "thickness" parameter of the ir filter L6 is the distance from the image side S13 to the image plane S14 of the ir filter L6. K in table 2 is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
In the following examples, the refractive index and abbe number of each lens are both numerical values at a reference wavelength.
TABLE 1
TABLE 2
Second embodiment
In the second embodiment as shown in fig. 3, the optical assembly 10 includes, in order from the object side to the image plane, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. Fig. 4 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical assembly 10 in the second embodiment.
The object-side surface S2 of the first lens element L1 is convex along the optical axis, and the image-side surface S3 of the first lens element L1 is concave along the optical axis; the object-side surface S2 of the first lens element L1 is convex at the circumference, and the image-side surface S3 of the first lens element L1 is convex at the circumference. The object-side surface S4 of the second lens element L2 is convex along the optical axis, and the image-side surface S5 of the second lens element L2 is concave along the optical axis; the object-side surface S4 of the second lens element L2 is convex at the circumference, and the image-side surface S5 of the second lens element L2 is concave at the circumference. The object-side surface S6 of the third lens element L3 is convex along the optical axis, and the image-side surface S7 of the third lens element L3 is concave along the optical axis; the object-side surface S6 of the third lens element L3 is convex at the circumference, and the image-side surface S7 of the third lens element L3 is concave at the circumference. The object-side surface S8 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S9 of the fourth lens element L4 is convex along the optical axis; the object-side surface S8 of the fourth lens element L4 is concave at the circumference, and the image-side surface S9 of the fourth lens element L4 is convex at the circumference. The object-side surface S10 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S11 of the fifth lens element L5 is concave along the optical axis; the object-side surface S10 of the fifth lens element L5 is convex at the circumference, and the image-side surface S11 of the fifth lens element L5 is convex at the circumference.
The object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric, so that the problem of distortion of the field of view can be solved due to the aspheric design, and the optical element 10 can be thinner and thinner due to the excellent optical effect of the smaller, thinner and flatter lens elements.
In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, and the use of the plastic material can reduce the weight of the optical assembly 10 and reduce the cost.
As shown in fig. 3, in the second embodiment, the optical assembly 10 is further provided with an infrared filter L6 made of glass, and the infrared filter L6 can isolate infrared light, so as to prevent the infrared light from interfering with imaging, thereby improving the imaging performance of the optical assembly 10.
In the second embodiment, the effective focal length f of the optical assembly 10 is 4.15mm, the f-number is 2.0, half of the maximum field angle is HFOV 37.2 degrees, and the distance from the object-side surface S2 of the first lens L1 to the image plane S14 on the optical axis is TTL 4.1 mm.
In addition, the parameters of the optical assembly 10 are given by tables 3 and 4. The elements from the object plane to the image plane S14 were arranged in the order of the elements from top to bottom in table 3. The radius Y in table 3 is a radius of curvature. The surface numbers 2 and 3 are the object-side surface S2 and the image-side surface S3 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance along the optical axis from the image-side surface of the lens element to the object-side surface of the next lens element. In addition, the value of the object plane corresponding to the plane number 0 in the "thickness" parameter is the distance from the object to the diaphragm ST0, and in other embodiments, the distance from the object to the diaphragm ST0 may also be 470mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 2000mm, 5000mm, or infinity. The value corresponding to the plane number 13 in the "thickness" parameter of the ir filter L6 is the distance from the image side S13 to the image plane S14 of the ir filter L6. K in table 4 is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
TABLE 3
TABLE 4
According to the provided parameter information, the following data can be deduced:
third embodiment
In the third embodiment as shown in fig. 5, the optical assembly 10 includes, in order from the object side to the image plane, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. Fig. 6 is a spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical assembly 10 in the third embodiment.
The object-side surface S2 of the first lens element L1 is convex along the optical axis, and the image-side surface S3 of the first lens element L1 is concave along the optical axis; the object-side surface S2 of the first lens element L1 is convex at the circumference, and the image-side surface S3 of the first lens element L1 is convex at the circumference. The object-side surface S4 of the second lens element L2 is convex along the optical axis, and the image-side surface S5 of the second lens element L2 is concave along the optical axis; the object-side surface S4 of the second lens element L2 is convex at the circumference, and the image-side surface S5 of the second lens element L2 is concave at the circumference. The object-side surface S6 of the third lens element L3 is concave along the optical axis, and the image-side surface S7 of the third lens element L3 is concave along the optical axis; the object-side surface S6 of the third lens element L3 is concave at the circumference, and the image-side surface S7 of the third lens element L3 is concave at the circumference. The object-side surface S8 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S9 of the fourth lens element L4 is convex along the optical axis; the object-side surface S8 of the fourth lens element L4 is concave at the circumference, and the image-side surface S9 of the fourth lens element L4 is convex at the circumference. The object-side surface S10 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S11 of the fifth lens element L5 is concave along the optical axis; the object-side surface S10 of the fifth lens element L5 is convex at the circumference, and the image-side surface S11 of the fifth lens element L5 is convex at the circumference.
The object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric, so that the problem of distortion of the field of view can be solved due to the aspheric design, and the optical element 10 can be thinner and thinner due to the excellent optical effect of the smaller, thinner and flatter lens elements.
In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, and the use of the plastic material can reduce the weight of the optical assembly 10 and reduce the cost.
As shown in fig. 5, in the third embodiment, the optical assembly 10 is further provided with an infrared filter L6 made of glass, and the infrared filter L6 can isolate infrared light, so as to prevent the infrared light from interfering with imaging, thereby improving the imaging performance of the optical assembly 10.
In the third embodiment, the effective focal length f of the optical assembly 10 is 4.29mm, the f-number is 1.8, half of the maximum field angle is HFOV 36.0 degrees, and the distance from the object-side surface S2 of the first lens L1 to the image plane S14 on the optical axis is TTL 4.85 mm.
In addition, the parameters of the optical assembly 10 are given by tables 5 and 6. The elements from the object plane to the image plane S14 were arranged in the order of the elements from top to bottom in table 5. The radius Y in table 5 is a radius of curvature. The surface numbers 2 and 3 are the object-side surface S2 and the image-side surface S3 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance along the optical axis from the image-side surface of the lens element to the object-side surface of the next lens element. In addition, the value of the object plane corresponding to the plane number 0 in the "thickness" parameter is the distance from the object to the diaphragm ST0, and in other embodiments, the distance from the object to the diaphragm ST0 may also be 470mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 2000mm, 5000mm, or infinity. The value corresponding to the plane number 13 in the "thickness" parameter of the ir filter L6 is the distance from the image side S13 to the image plane S14 of the ir filter L6. K in table 6 is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
TABLE 5
TABLE 6
According to the provided parameter information, the following data can be deduced:
fourth embodiment
In the fourth embodiment as shown in fig. 7, the optical assembly 10 includes, in order from the object side to the image plane, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. Fig. 8 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical assembly 10 in the fourth embodiment.
The object-side surface S2 of the first lens element L1 is convex along the optical axis, and the image-side surface S3 of the first lens element L1 is concave along the optical axis; the object-side surface S2 of the first lens element L1 is convex at the circumference, and the image-side surface S3 of the first lens element L1 is convex at the circumference. The object-side surface S4 of the second lens element L2 is convex along the optical axis, and the image-side surface S5 of the second lens element L2 is concave along the optical axis; the object-side surface S4 of the second lens element L2 is convex at the circumference, and the image-side surface S5 of the second lens element L2 is concave at the circumference. The object-side surface S6 of the third lens element L3 is convex along the optical axis, and the image-side surface S7 of the third lens element L3 is concave along the optical axis; the object-side surface S6 of the third lens element L3 is concave at the circumference, and the image-side surface S7 of the third lens element L3 is convex at the circumference. The object-side surface S8 of the fourth lens element L4 is convex along the optical axis, and the image-side surface S9 of the fourth lens element L4 is convex along the optical axis; the object-side surface S8 of the fourth lens element L4 is concave at the circumference, and the image-side surface S9 of the fourth lens element L4 is convex at the circumference. The object-side surface S10 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S11 of the fifth lens element L5 is concave along the optical axis; the object-side surface S10 of the fifth lens element L5 is concave at the circumference, and the image-side surface S11 of the fifth lens element L5 is convex at the circumference.
The object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric, so that the problem of distortion of the field of view can be solved due to the aspheric design, and the optical element 10 can be thinner and thinner due to the excellent optical effect of the smaller, thinner and flatter lens elements.
In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, and the use of the plastic material can reduce the weight of the optical assembly 10 and reduce the cost.
As shown in fig. 7, in the fourth embodiment, the optical assembly 10 is further provided with an infrared filter L6 made of glass, and the infrared filter L6 can isolate infrared light, so as to prevent the infrared light from interfering with imaging, thereby improving the imaging performance of the optical assembly 10.
In the fourth embodiment, the effective focal length f of the optical assembly 10 is 4.31mm, the f-number is 1.7, half of the maximum field angle is HFOV 36.1 degrees, and the distance from the object-side surface S2 of the first lens L1 to the image plane S14 on the optical axis is TTL 5.35 mm.
In addition, the parameters of the optical assembly 10 are given by tables 7 and 8. The elements from the object plane to the image plane S14 were arranged in the order of the elements from top to bottom in table 7. The radius Y in table 7 is a radius of curvature. The surface numbers 2 and 3 are the object-side surface S2 and the image-side surface S3 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance along the optical axis from the image-side surface of the lens element to the object-side surface of the next lens element. In addition, the value of the object plane corresponding to the plane number 0 in the "thickness" parameter is the distance from the object to the diaphragm ST0, and in other embodiments, the distance from the object to the diaphragm ST0 may also be 470mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 2000mm, 5000mm, or infinity. The value corresponding to the plane number 13 in the "thickness" parameter of the ir filter L6 is the distance from the image side S13 to the image plane S14 of the ir filter L6. K in table 8 is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
TABLE 7
TABLE 8
According to the provided parameter information, the following data can be deduced:
fifth embodiment
In the fifth embodiment as shown in fig. 9, the optical assembly 10 includes, in order from an object side to an image plane, a stop ST0, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and a fifth lens element L5 with negative refractive power. Fig. 10 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical assembly 10 in the fifth embodiment.
The object-side surface S2 of the first lens element L1 is convex along the optical axis, and the image-side surface S3 of the first lens element L1 is concave along the optical axis; the object-side surface S2 of the first lens element L1 is convex at the circumference, and the image-side surface S3 of the first lens element L1 is convex at the circumference. The object-side surface S4 of the second lens element L2 is convex along the optical axis, and the image-side surface S5 of the second lens element L2 is concave along the optical axis; the object-side surface S4 of the second lens element L2 is convex at the circumference, and the image-side surface S5 of the second lens element L2 is concave at the circumference. The object-side surface S6 of the third lens element L3 is convex along the optical axis, and the image-side surface S7 of the third lens element L3 is concave along the optical axis; the object-side surface S6 of the third lens element L3 is concave at the circumference, and the image-side surface S7 of the third lens element L3 is convex at the circumference. The object-side surface S8 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S9 of the fourth lens element L4 is convex along the optical axis; the object-side surface S8 of the fourth lens element L4 is concave at the circumference, and the image-side surface S9 of the fourth lens element L4 is convex at the circumference. The object-side surface S10 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S11 of the fifth lens element L5 is concave along the optical axis; the object-side surface S10 of the fifth lens element L5 is convex at the circumference, and the image-side surface S11 of the fifth lens element L5 is convex at the circumference.
The object-side surface and the image-side surface of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are aspheric, so that the problem of distortion of the field of view can be solved due to the aspheric design, and the optical element 10 can be thinner and thinner due to the excellent optical effect of the smaller, thinner and flatter lens elements.
In addition, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all made of plastic, and the use of the plastic material can reduce the weight of the optical assembly 10 and reduce the cost.
As shown in fig. 9, in the fifth embodiment, the optical assembly 10 is further provided with an infrared filter L6 made of glass, and the infrared filter L6 can isolate infrared light, so as to prevent the infrared light from interfering with imaging, thereby improving the imaging performance of the optical assembly 10.
In the fifth embodiment, the effective focal length f of the optical assembly 10 is 3.76mm, the f-number is 2.2, half of the maximum field angle is HFOV 40.43 degrees, and the distance from the object-side surface S2 of the first lens L1 to the image plane S14 on the optical axis is TTL 4.13 mm.
In addition, the parameters of the optical component 10 are given by table 9 and table 10. The elements from the object plane to the image plane S14 were arranged in the order of the elements from top to bottom in table 9. The radius Y in table 9 is a radius of curvature. The surface numbers 2 and 3 are the object-side surface S2 and the image-side surface S3 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object-side surface and the surface with the larger surface number is the image-side surface in the same lens. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis, and the second value is the distance along the optical axis from the image-side surface of the lens element to the object-side surface of the next lens element. In addition, the value of the object plane corresponding to the plane number 0 in the "thickness" parameter is the distance from the object to the diaphragm ST0, and in other embodiments, the distance from the object to the diaphragm ST0 may also be 470mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 2000mm, 5000mm, or infinity. The value corresponding to the plane number 13 in the "thickness" parameter of the ir filter L6 is the distance from the image side S13 to the image plane S14 of the ir filter L6. K in table 10 is a conic constant, and Ai is a coefficient corresponding to the i-th high-order term in the aspherical surface type formula.
TABLE 9
According to the provided parameter information, the following data can be deduced:
in the embodiment shown in fig. 11, the optical assembly 10 is applied to the image capturing module 20, and the image capturing module 20 includes a photosensitive element 210, and the photosensitive element 210 is disposed on the image forming surface S14 of the optical assembly 10. In some embodiments, the photosensitive element 210 is a CCD (Charge Coupled Device) or a CMOS (Complementary Metal oxide semiconductor).
In some embodiments, image information of the subject is received by the light sensing element 210 after passing through the stop ST0, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the infrared filter L6 in this order. Specifically, in some embodiments, the optical assembly 10 and the photosensitive element 210 are formed by dispensing and packaging. By adopting the optical assembly 10, when the image capturing module 20 is mounted with the photosensitive element 210 having high pixels to obtain an imaging picture with high imaging quality, the length of the image capturing module 20 in the optical axis direction can be effectively shortened, thereby realizing a miniaturized design.
As shown in fig. 12, in some embodiments, the image capturing module 20 may also be used in the mobile terminal 30, and the mobile terminal 30 includes a housing 310, and the image capturing module 20 is disposed on the housing 310. Specifically, in some embodiments, the housing 310 is a middle frame of the mobile terminal 30. In particular, in some embodiments, the mobile terminal 30 may be a miniaturized smart phone, camera phone, digital camera, game console, tablet, PC, or other electronic device.
By adopting the image capturing module 20, the mobile terminal 30 has a good field angle in photography and imaging, and because the image capturing module 20 has a characteristic of miniaturization, the image capturing module 20 can be more flexibly disposed in the mobile terminal 30, so that the mobile terminal 30 can be designed in a thinner direction, and the design space is improved, meanwhile, compared with a general module, because the image capturing module 20 has a characteristic of a large field angle, the mobile terminal 30 also has a good image capturing performance.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical assembly, comprising, in order from an object side to an image side:
a diaphragm;
the optical lens assembly comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a sixth lens element with negative refractive power, a sixth lens element with positive refractive power;
a second lens element with refractive power having a convex object-side surface and a concave image-side surface;
a third lens element with refractive power;
a fourth lens element with positive refractive power having a convex image-side surface;
the optical axis of the fifth lens element is concave, the object-side surface and the image-side surface of the fifth lens element are aspheric, and the image-side surface of the fifth lens element is provided with at least one inflection point;
the optical assembly satisfies the following relation:
0.8<f/f123<1.2；
wherein f is a focal length of the optical assembly, and f123 is a combined focal length of the first lens, the second lens and the third lens.
2. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
1.2<EPD/R1<1.8；
where EPD is the entrance pupil aperture of the optical assembly and R1 is the radius of curvature of the object-side surface of the first lens.
3. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
0≤|SAG41|/|SAG31|≤105；
SAG31 is the distance on the optical axis from the intersection point of the object-side surface of the third lens to the vertex of the effective radius of the object-side surface of the third lens, and SAG41 is the distance on the optical axis from the intersection point of the object-side surface of the fourth lens to the vertex of the effective radius of the object-side surface of the fourth lens.
4. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
0.6<SD52/ImgH<0.9；
wherein SD52 is the effective half aperture of the image side surface of the fifth lens, and ImgH is the maximum imaging height of the optical assembly.
5. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
TTL/f1≤1.5；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical assembly, and f1 is a focal length of the first lens element.
6. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
0.165(1/mm)≤[tan(HFOV))]/f≤0.240(1/mm)；
wherein f is a focal length of the optical assembly and the HFOV is half of a maximum field angle of the optical assembly.
7. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
SD21/SD11≤1；
wherein SD21 is the effective half aperture of the object-side surface of the second lens and SD11 is the effective half aperture of the object-side surface of the first lens.
8. The optical assembly of claim 1, wherein the optical assembly satisfies the following relationship:
1.4<Nd2<1.7；
1.4<Nd3<1.7；
wherein Nd2 is a refractive index of the second lens, and Nd3 is a refractive index of the third lens.
9. An image capturing module, comprising a photosensitive element and the optical assembly of any one of claims 1 to 8, wherein the photosensitive element is disposed on an image plane of the optical assembly.
10. A mobile terminal, comprising a housing and the image capturing module of claim 9, wherein the image capturing module is disposed on the housing.
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| CN111736321A (en) * | 2020-08-26 | 2020-10-02 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN112114418A (en) * | 2020-09-24 | 2020-12-22 | 玉晶光电(厦门)有限公司 | Optical lens group |
| WO2022120792A1 (en) * | 2020-12-11 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
| CN114967074A (en) * | 2022-06-28 | 2022-08-30 | 东莞晶彩光学有限公司 | Short-focus optical lens |
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2018
- 2018-12-14 CN CN201811536982.0A patent/CN111323891A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111736321A (en) * | 2020-08-26 | 2020-10-02 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN112114418A (en) * | 2020-09-24 | 2020-12-22 | 玉晶光电(厦门)有限公司 | Optical lens group |
| CN112114418B (en) * | 2020-09-24 | 2023-08-15 | 玉晶光电(厦门)有限公司 | Optical lens group |
| WO2022120792A1 (en) * | 2020-12-11 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
| CN114967074A (en) * | 2022-06-28 | 2022-08-30 | 东莞晶彩光学有限公司 | Short-focus optical lens |
| CN114967074B (en) * | 2022-06-28 | 2023-08-01 | 东莞晶彩光学有限公司 | Short-focus optical lens |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant after: Jiangxi Jingchao optics Co.,Ltd. Address before: 330200 East of College Sixth Road and South of Tianxiang Avenue, Nanchang High-tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant before: NANCHANG OUFEI PRECISION OPTICAL PRODUCT Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant after: Jiangxi Oufei Optics Co.,Ltd. Address before: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Applicant before: Jiangxi Jingchao optics Co.,Ltd. Country or region before: China |