CN115079383B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN115079383B CN115079383B CN202211006538.4A CN202211006538A CN115079383B CN 115079383 B CN115079383 B CN 115079383B CN 202211006538 A CN202211006538 A CN 202211006538A CN 115079383 B CN115079383 B CN 115079383B
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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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Abstract
The invention discloses an optical lens and imaging equipment, wherein the optical lens sequentially comprises the following components from an object side to an imaging surface along an optical axis: a first lens element having a positive refractive power, the object-side surface of which is convex and the image-side surface of which is concave; a diaphragm; a second lens element having a negative refractive power, the object-side surface of the second lens element being convex and the image-side surface of the second lens element being concave; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having a focal power, an image-side surface of which is convex at a paraxial region; a fifth lens element having a negative refractive power, the object-side surface of which is concave; a plate glass having no optical power. The optical lens of the invention adopts five aspheric lenses with focal power and one piece of flat glass without focal power, and has the advantages of at least large aperture, long focal length and high resolution quality.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical lens and an imaging device.
Background
In recent years, with the pursuit of the imaging quality of portable electronic products, telescopic lenses are carried on flagship mobile phones of most manufacturers to achieve the effects of background blurring, distant view shooting and the like.
However, the conventional telephoto lens generally has a long focal length and a small aperture, resulting in a dark picture and poor imaging quality. In order to achieve a higher-quality imaging effect, the development trend of a telephoto lens is to reduce the FNO of the lens and improve the aperture of the lens.
Disclosure of Invention
Based on this, the present invention provides an optical lens and an imaging apparatus, which have at least the advantages of large aperture, long focal length, and high pixel.
The invention achieves the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a diaphragm; the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens is provided with focal power, and the image side surface of the third lens is a concave surface; a fourth lens having a power, an image-side surface of the fourth lens being convex at a paraxial region; a fifth lens having a negative optical power, an object side surface of the fifth lens being a concave surface; wherein, the optical lens satisfies the following conditional expression: 0.21-woven fabric CT12/DT <0.33; wherein CT12 represents an air space on the optical axis between the first lens and the second lens, and DT represents a distance on the optical axis between the object-side surface of the first lens and the image-side surface of the fifth lens.
In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element for converting an optical image formed by the optical lens into an electrical signal, and the optical lens provided in the first aspect.
Compared with the prior art, the optical lens provided by the invention adopts five lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the lens has longer focal length while meeting high pixel; meanwhile, the FNO of the optical lens is designed to be between 2.5 and 3.0, so that the light input quantity of the optical system is enlarged, the imaging quality of the system in a dark environment is improved, and the use requirement of long-range shooting of the portable electronic equipment is better met.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present disclosure.
Fig. 2 is a field curvature graph of the optical lens in the first embodiment of the present invention.
Fig. 3 is a graph illustrating optical distortion of an optical lens according to a first embodiment of the present invention.
Fig. 4 is a vertical axis chromatic aberration diagram of the optical lens in the first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention.
Fig. 6 is a field curvature graph of an optical lens in a second embodiment of the present invention.
Fig. 7 is a graph showing an optical distortion of an optical lens in a second embodiment of the present invention.
FIG. 8 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention.
Fig. 10 is a field curvature graph of an optical lens in a third embodiment of the present invention.
Fig. 11 is an optical distortion graph of an optical lens in a third embodiment of the present invention.
FIG. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Fig. 13 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present invention.
Fig. 14 is a field curvature diagram of an optical lens according to a fourth embodiment of the present invention.
Fig. 15 is a graph showing an optical distortion of an optical lens in the fourth embodiment of the present invention.
FIG. 16 is a vertical axis chromatic aberration diagram of an optical lens according to a fourth 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. Several embodiments of the 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.
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 of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and flat glass.
The first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has focal power, and the image side surface of the third lens is a concave surface; the fourth lens has focal power, and the image side surface of the fourth lens is convex at a paraxial region; the fifth lens has negative focal power, and the object side surface of the fifth lens is a concave surface.
The optical lens provided by the invention adopts five lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the lens has a longer focal length while meeting high pixel; meanwhile, a thicker plate glass is adopted between the fifth lens and the imaging surface, and the plate glass can be equivalent to an optical prism and used for turning the emergent ray of the fifth lens and forming high-definition images on the imaging surface.
In some embodiments, the optical lens satisfies the following conditional expression:
0.21<CT12/DT<0.33； （1）
wherein CT12 represents an air space on the optical axis between the first lens and the second lens, and DT represents a distance on the optical axis between the object-side surface of the first lens and the image-side surface of the fifth lens. The optical lens can have longer effective focal length, larger aperture and high resolution quality by reasonably controlling the value of CT12/DT when the conditional expression (1) is satisfied, and simultaneously, the total length of the optical lens can be shortened, the effective diameter of the lens can be reduced, and the miniaturization of the lens can be realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<(CT2+CT3)/CT5 <1.5；（2）
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, and CT5 denotes a center thickness of the fifth lens. Satisfy above-mentioned conditional expression (2), through the central thickness of rational distribution second lens, third lens, fifth lens, make it can not be too thin or too thick, be favorable to the lens processing, reduce lens machining tolerance, can shorten camera lens length simultaneously, be favorable to the miniaturization of camera lens.
In some embodiments, the optical lens satisfies the following conditional expression:
3.2<(CT2+CT3+CT4) / (CT23+CT34) <7.5；（3）
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, CT4 denotes a center thickness of the fourth lens, CT23 denotes an air space between the second lens and the third lens on an optical axis, and CT34 denotes an air space between the third lens and the fourth lens on the optical axis. Satisfy above-mentioned conditional expression (3), through the air space between rational distribution second lens, the third lens, the air space between third lens, the fourth lens and the relation of the center thickness of second lens, third lens, fourth lens, be favorable to reducing the effective footpath of second lens, third lens, fourth lens, reduce the volume of camera lens, be favorable to shortening the interval between the lens simultaneously to and be favorable to the structural design of camera lens and the miniaturization of camera lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.4<BFL/TTL<0.6； （4）
0.3< CT6/TTL<0.5； （5）
BFL represents the air distance between the image side surface of the fifth lens and an imaging surface on an optical axis, CT6 represents the center thickness of the flat glass, and TTL represents the total optical length of the optical lens. Satisfying the above conditional expressions (4) and (5), by reasonably distributing the thickness of the back focus and the flat glass of the optical system, enough space can be reserved for the setting of the turning light path of the optical system, which is beneficial to reducing the length of the optical system.
In some embodiments, the optical lens satisfies the following conditional expression:
7<f*IH/f1<10；（6）
wherein f represents the effective focal length of the optical lens, IH represents the actual half image height of the optical lens on the imaging plane, and f1 represents the effective focal length of the first lens. Satisfying above-mentioned conditional expression (6), through the value of reasonable control f IH/f1, be favorable to obtaining bigger effective focal length, be favorable to obtaining bigger imaging area simultaneously, be suitable for the chip of higher pixel.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.8< (φ32+φ41)/CT34<-0.4；（7）
wherein φ 32 represents the optical power of the image side surface of the third lens, φ 41 represents the optical power of the object side surface of the fourth lens, and CT34 represents the air space between the third lens and the fourth lens on the optical axis. Satisfy above-mentioned conditional expression (7), through the shape of reasonable control third lens image side face and fourth lens object side face, be favorable to the light of divergent marginal visual field, increase optical system's half image height.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5< (φ11-φ22)/(φ11+φ12) <2.5；（8）
wherein φ 11 represents the optical power of the object-side surface of the first lens, φ 12 represents the optical power of the image-side surface of the first lens, and φ 22 represents the optical power of the image-side surface of the second lens. Satisfy above-mentioned conditional expression (8), through the face type of the first lens of reasonable adjustment and second lens, be favorable to increasing the entrance pupil diameter, increase optical system's f-number is favorable to guaranteeing that optical lens still has high quality formation of image under the darker environment of light.
In some embodiments, the optical lens satisfies the following conditional expression:
1.8＜R12/f1＜3.2；（9）
wherein R12 represents a radius of curvature of an image side surface of the first lens, and f1 represents an effective focal length of the first lens. Satisfy above-mentioned conditional expression (9), through the focal power of rational distribution first lens, be favorable to promoting optical lens's imaging quality.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<(1/φ41-1/φ42)/f5<3.0；（10）
wherein φ 41 represents the optical power of the object side surface of the fourth lens, φ 42 represents the optical power of the image side surface of the fourth lens, and f5 represents the effective focal length of the fifth lens. The conditional expression (10) is satisfied, and the relationship between the surface type of the fourth lens and the focal length of the fifth lens is reasonably adjusted, so that the trend of the light rays of the off-axis field of view is favorably alleviated, the aberration of the off-axis field of view and the central field of view is reduced, and the resolution quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.4<（CT1+CT12）/f1 <0.5；（11）
where CT1 denotes a center thickness of the first lens, CT12 denotes an air space between the first lens and the second lens on an optical axis, and f1 denotes an effective focal length of the first lens. Satisfying above-mentioned conditional expression (11), through the relation of the first lens focus of adjusting the distance of first lens objective side to second lens objective side, be favorable to the beam-receiving to get into the light of camera lens, reduce the effective footpath of second lens, realize the miniaturization of camera lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.0<(R41+R42)/f3<-0.3；（12）
wherein R41 represents a radius of curvature of an object-side surface of the fourth lens, R42 represents a radius of curvature of an image-side surface of the fourth lens, and f3 represents an effective focal length of the third lens. The conditional expression (12) is satisfied, and the relationship between the surface shape of the fourth lens and the focal length of the third lens is adjusted, so that the aberration of a large field of view is favorably corrected, and the resolving power of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.0＜f/R52＜0.5；（13）
wherein f represents an effective focal length of the optical lens, and R52 represents a curvature radius of an image side surface of the fifth lens. And the relation between the surface type and the focal length of the fifth lens is reasonably controlled to satisfy the conditional expression (13), so that the imaging quality of the optical lens is improved.
In some embodiments, the third lens and the fourth lens each have a positive optical power. In other embodiments, one of the third and fourth lenses may have a positive optical power and the other a negative optical power. The third lens and the fourth lens adopt different focal power combinations, so that the system can achieve a good imaging effect.
In one embodiment, the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element may be all plastic lenses or may be a glass-plastic mixture. In the application, in order to obtain better optical performance and a better matching processing technology, a combination of one piece of molded glass lens and four pieces of plastic lenses is adopted, and the optical lens at least has the advantages of good imaging quality, long focal length, large aperture, short depth of field, low sensitivity and miniaturization by reasonably distributing the focal power of each lens and optimizing the surface shape of each lens.
In some embodiments, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses. By adopting the aspheric lens, the aberration can be effectively corrected, the imaging quality is improved, and a product with higher performance-price ratio and optical performance is provided.
In each embodiment of the present invention, when an aspherical lens is used as a lens in an optical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the rise of the distance from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, and k is the conic coefficient, A 2i The coefficient of the aspheric surface type of the 2 i-th order.
The invention is further illustrated below by means of a number of examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
First embodiment
Referring to fig. 1, which is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention, the optical lens 100 sequentially includes, from an object side to an image plane S13 along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a flat glass G1.
The first lens L1 has positive focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive optical power, the object-side surface S5 of the third lens element is convex at the paraxial region, and the image-side surface S6 of the third lens element is concave; the fourth lens element L4 has negative power, the fourth lens element has a concave object-side surface S7, and a convex image-side surface S8 at the paraxial region; the fifth lens L5 has negative optical power, the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is concave at the paraxial region; the object side surface of the plate glass is S11, and the image side surface of the plate glass is S12. The first lens element L1 is a molded aspheric lens element, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are plastic aspheric lens elements.
The parameters associated with each lens of the optical lens 100 provided by the first embodiment of the present invention are shown in table 1.
TABLE 1
The surface shape coefficients of the respective aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.
TABLE 2
In the present embodiment, the schematic structural diagram, the field curvature graph, the optical distortion graph and the vertical axis chromatic aberration graph of the optical lens 100 are respectively shown in fig. 1, fig. 2, fig. 3 and fig. 4.
Fig. 2 shows a curvature of field curve of the optical lens 100 in this embodiment, which represents the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the image plane in two directions is controlled within ± 0.2mm, which indicates that the curvature of field of the optical lens 100 is well corrected.
Fig. 3 shows an optical F-Tan (θ) distortion curve of the optical lens 100 of the present embodiment, which represents the distortion at different image heights on the image plane, and it can be seen from the figure that the optical distortion is controlled within 1.5%, which indicates that the distortion of the optical lens 100 is well corrected.
Fig. 4 shows a vertical axis chromatic aberration curve of the optical lens 100 of the present embodiment, which shows vertical axis chromatic aberration values between light with different wavelengths and the main wavelength, and it can be seen from the graph that the vertical axis chromatic aberration values of the wavelengths are within ± 1 μm, which indicates that the vertical axis chromatic aberration of the optical lens 100 is well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a first embodiment of the present invention is shown, where the optical lens 200 includes, in order from an object side to an image plane S13 along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a flat glass G1.
The first lens L1 has positive focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface; the third lens L3 has positive focal power, the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface; the fourth lens element L4 has positive optical power, the object-side surface S7 of the fourth lens element is convex, and the image-side surface S8 of the fourth lens element is convex at paraxial region; the fifth lens L5 has negative focal power, the object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface; the object side surface of the plate glass is S11, and the image side surface is S12. The first lens element L1 is a molded aspheric lens element, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are plastic aspheric lens elements.
The parameters associated with each lens of the optical lens 200 according to the first embodiment of the present invention are shown in table 3.
TABLE 3
The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
In the present embodiment, the schematic structural diagram, the field curvature graph, the optical distortion graph and the vertical axis chromatic aberration graph of the optical lens 200 are respectively shown in fig. 5, fig. 6, fig. 7 and fig. 8.
Fig. 6 shows a curvature of field curve of the optical lens 200 in this embodiment, which represents the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the image plane in two directions is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 200 is well corrected.
Fig. 7 shows an optical F-Tan (θ) distortion curve of the optical lens 200 of the present embodiment, which represents the distortion at different image heights on the image plane, and it can be seen from the figure that the optical distortion is controlled within 1.5%, which indicates that the distortion of the optical lens 200 is well corrected.
Fig. 8 shows a vertical axis chromatic aberration curve of the optical lens 200 of the present embodiment, which shows the vertical axis chromatic aberration between the light with different wavelengths and the main wavelength, and it can be seen from the graph that the vertical axis chromatic aberration of each wavelength is within ± 1.5 μm, which indicates that the vertical axis chromatic aberration of the optical lens 200 is well corrected.
Third embodiment
Referring to fig. 9, which is a schematic structural diagram of an optical lens 300 according to a first embodiment of the present invention, the optical lens 300 sequentially includes, from an object side to an image plane S13 along an optical axis: a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a plate glass G1.
The first lens L1 has positive focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive optical power, the object-side surface S5 of the third lens element is convex at the paraxial region, and the image-side surface S6 of the third lens element is concave; the fourth lens element L4 has negative power, the fourth lens element has a concave object-side surface S7, and a convex image-side surface S8 at the paraxial region; the fifth lens L5 has negative focal power, the object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface; the object side surface of the plate glass is S11, and the image side surface of the plate glass is S12. The first lens element L1 is a molded aspheric lens element, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are plastic aspheric lens elements.
The parameters associated with each lens of the optical lens 300 according to the first embodiment of the present invention are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.
TABLE 6
In the present embodiment, the schematic structural diagram, the field curvature graph, the optical distortion graph and the vertical axis chromatic aberration graph of the optical lens 300 are respectively shown in fig. 9, fig. 10, fig. 11 and fig. 12.
Fig. 10 shows a curvature of field curve of the optical lens 300 in this embodiment, which represents the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the image plane in two directions is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 300 is well corrected.
Fig. 11 shows an optical F-Tan (θ) distortion curve of the optical lens 300 of the present embodiment, which represents the distortion at different image heights on the image plane, and it can be seen from the figure that the optical distortion is controlled within 2.0%, which indicates that the distortion of the optical lens 300 is well corrected.
Fig. 12 shows a vertical axis chromatic aberration curve of the optical lens 300 of the present embodiment, which shows vertical axis chromatic aberration values between light with different wavelengths and the main wavelength, and it can be seen from the graph that the vertical axis chromatic aberration values of the respective wavelengths are within ± 2 μm, which indicates that the vertical axis chromatic aberration of the optical lens 300 is well corrected.
Fourth embodiment
Referring to fig. 13, which is a schematic structural diagram of an optical lens 400 according to a first embodiment of the present invention, the optical lens 400 sequentially includes, from an object side to an image plane S13 along an optical axis: a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a plate glass G1.
The first lens L1 has positive focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface; the third lens L3 has positive focal power, the object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface; the fourth lens element L4 has positive optical power, the object-side surface S7 of the fourth lens element is concave, and the image-side surface S8 of the fourth lens element is convex at the paraxial region; the fifth lens L5 has negative focal power, the object-side surface S9 of the fifth lens is a concave surface, and the image-side surface S10 of the fifth lens is a convex surface; the object side surface of the plate glass is S11, and the image side surface of the plate glass is S12. The first lens element L1 is a molded aspheric lens element, and the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are plastic aspheric lens elements.
The parameters associated with each lens of the optical lens assembly 400 according to the first embodiment of the present invention are shown in table 7.
TABLE 7
The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.
TABLE 8
In the present embodiment, the schematic structural diagram, the field curvature graph, the optical distortion graph and the vertical axis chromatic aberration graph of the optical lens 400 are respectively shown in fig. 13, 14, 15 and 16.
Fig. 14 shows a curvature of field curve of the optical lens 400 in this embodiment, which shows the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that the curvature of field of the image planes in two directions is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 400 is well corrected.
Fig. 15 shows an optical F-Tan (θ) distortion curve of the optical lens 400 of the present embodiment, which represents the distortion at different image heights on the image plane, and it can be seen from the figure that the optical distortion is controlled within 1.5%, which indicates that the distortion of the optical lens 400 is well corrected.
Fig. 16 shows a vertical axis chromatic aberration curve of the optical lens 400 of the present embodiment, which shows vertical axis chromatic aberration values between light with different wavelengths and the main wavelength, and it can be seen from the graph that the vertical axis chromatic aberration values of the respective wavelengths are within ± 1 μm, which indicates that the vertical axis chromatic aberration of the optical lens 400 is well corrected.
Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the effective focal length F, F #, total optical length TTL, field angle 2 θ, and half-image height IH of the system, and the values corresponding to each of the above conditional expressions.
TABLE 9
In summary, the optical lens provided by the present invention adopts five aspheric lenses with specific focal power, and has at least the following advantages by specific surface shape matching and reasonable focal power distribution: 1. the effective calibers of the rear four lenses are reduced, the volume of the lens is reduced, and the miniaturization of the lens is realized; 2. the diaphragm has a larger diaphragm (2.5 is more than FNO and less than or equal to 2.8), and the requirement of the large diaphragm is met; 3. the focal length of the lens is long (f is more than or equal to 16 mm), and high-definition imaging of long-range shooting is realized; 4. the image height of the lens is large, and the lens can be matched with a CMOS chip of 1/1.56 inch for clear imaging.
Fifth embodiment
A fifth embodiment of the present invention provides an imaging apparatus that may include an imaging element and an optical lens (e.g., optical lens 100) in any of the embodiments described above. The imaging element may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor.
The imaging device can be a smart phone, a tablet computer, a monitoring device and any other electronic device loaded with the optical lens.
The imaging apparatus provided by the present embodiment includes the optical lens 100, and since the optical lens 100 has advantages of long focal length, large aperture, high pixel, and compact structure, the imaging apparatus having the optical lens 100 also has advantages of long focal length, large aperture, high pixel, and compact structure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (12)
1. An optical lens, comprising, in order from an object side to an image side along an optical axis:
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface;
a diaphragm;
the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
a third lens having a focal power, an image-side surface of the third lens being concave;
a fourth lens having a power, an image-side surface of the fourth lens being convex at a paraxial region;
a fifth lens having a negative optical power, an object side surface of the fifth lens being a concave surface;
a plate glass;
wherein, the optical lens satisfies the following conditional expression:
0.21<CT12/DT<0.33；
7<f*IH/f1<10；
wherein CT12 represents an air space on an optical axis between the first lens element and the second lens element, DT represents a distance on the optical axis between an object-side surface of the first lens element and an image-side surface of the fifth lens element, f represents an effective focal length of the optical lens, IH represents an actual half image height of the optical lens on an image plane, and f1 represents an effective focal length of the first lens element.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.9<(CT2+CT3)/CT5<1.5；
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, and CT5 denotes a center thickness of the fifth lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3.2<(CT2+CT3+CT4)/(CT23+CT34)<7.5；
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, CT4 denotes a center thickness of the fourth lens, CT23 denotes an air space between the second lens and the third lens on the optical axis, and CT34 denotes an air space between the third lens and the fourth lens on the optical axis.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.4<BFL/TTL<0.6；
0.3<CT6/TTL<0.5；
BFL represents the air distance between the image side surface of the fifth lens and the imaging surface on the optical axis, CT6 represents the center thickness of the flat glass, and TTL represents the total optical length of the optical lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.8<(φ32+φ41)/CT34<-0.4；
wherein φ 32 represents the optical power of the image side surface of the third lens, φ 41 represents the optical power of the object side surface of the fourth lens, and CT34 represents the air space between the third lens and the fourth lens on the optical axis.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5<(φ11-φ22)/(φ11+φ12)<2.5；
wherein φ 11 represents the optical power of the object side surface of the first lens, φ 12 represents the optical power of the image side surface of the first lens, and φ 22 represents the optical power of the image side surface of the second lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.8＜R12/f1＜3.2；
wherein R12 represents a radius of curvature of an image-side surface of the first lens, and f1 represents an effective focal length of the first lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5<(1/φ41-1/φ42)/f5<3.0；
wherein φ 41 represents the optical power of the object side surface of the fourth lens, φ 42 represents the optical power of the image side surface of the fourth lens, and f5 represents the effective focal length of the fifth lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.4<(CT1+CT12)/f1<0.5；
where CT1 denotes a center thickness of the first lens, CT12 denotes an air space between the first lens and the second lens on an optical axis, and f1 denotes an effective focal length of the first lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1.0<(R41+R42)/f3<-0.3；
wherein R41 represents a radius of curvature of an object-side surface of the fourth lens, R42 represents a radius of curvature of an image-side surface of the fourth lens, and f3 represents an effective focal length of the third lens.
11. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2.0＜f/R52＜0.5；
wherein f represents an effective focal length of the optical lens, and R52 represents a radius of curvature of the image side surface of the fifth lens.
12. An imaging apparatus comprising an optical lens according to any one of claims 1 to 11 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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