CN117826376A - Optical lens - Google Patents
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Abstract
The invention relates to the technical field of lenses, in particular to an optical lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a diaphragm; a first lens having positive optical power; a second lens having negative optical power; the included angle between the reflecting surface of the prism and the optical axis is 45 degrees; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power. The light beam on the object side of the optical lens is converged by the first lens and the second lens, enters the light entering side of the plastic prism, is reflected by the reflecting surface of the prism, enables the optical axis to turn 90 degrees, then sequentially enters the third lens to the fifth lens, and finally achieves the purpose of completing image acquisition on the photosensitive chip through the filtering treatment of the optical filter. The fifth lens can horizontally move to complete focusing at a shorter distance, the focusing distance is 35cm, and the moving distance of the lens is smaller than 0.5mm, so that the effects of compatibility of long-focus section and short-distance shooting and miniaturization are achieved.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to an optical lens.
Background
With the popularity of smartphones, the use of smartphones has become a major choice to meet this demand in terms of photography and image capture. However, when a distant object needs to be photographed, the optical lens must have a longer focal length to ensure clear imaging, which also means that a larger optical total length is required. Because the thickness of the smart phone is limited, the traditional tele lens cannot be directly integrated inside the mobile phone. Therefore, the periscope type mobile phone lens gradually turns over the corner, and long-distance shooting is realized by turning over the optical path. In addition, one of the development trends of future mobile phone lenses is to realize a single lens and meet the diversified demands of long-distance and short-distance shooting at the same time.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provide an optical lens.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an optical lens comprising, in order from an object side to an image side along an optical axis:
a diaphragm;
a first lens having positive optical power;
a second lens having negative optical power;
the included angle between the reflecting surface of the prism and the optical axis is 45 degrees;
a third lens having positive optical power;
a fourth lens having positive optical power;
a fifth lens having negative optical power; the fifth lens is movable along the optical axis, and the moving distance of the fifth lens is less than 0.5mm.
Further, the combined focal power of the first lens and the second lens is positive, and the combined focal power of the third lens, the fourth lens and the fifth lens is negative.
Further, the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first lens and the second lens, and f345 denotes a combined effective focal length of the third lens, the fourth lens, and the fifth lens.
Further, the refractive index of the prism is between 1.5 and 1.6, and the Abbe number of the prism is between 50 and 60.
Further, the optical lens satisfies the following conditional expression:
；
wherein CT3 represents the center thickness of the third lens on the optical axis, CT4 represents the center thickness of the fourth lens on the optical axis, CT5 represents the center thickness of the fifth lens on the optical axis, T34 represents the distance between the third lens and the fourth lens in the optical axis direction, and T45 represents the distance between the fourth lens and the fifth lens in the optical axis.
Further, the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first and second lenses, and PrL denotes an on-axis distance from an image side of the prism to an object side of the third lens.
Further, the optical lens satisfies the following conditional expression:
；
where PrL denotes an on-axis distance from an image side surface of the prism to an object side surface of the third lens element, and IH denotes a maximum half image height on an imaging plane of the optical lens.
Further, the optical lens satisfies the following conditional expression:
；
where f represents an effective focal length of the optical lens, and R52 represents a radius of curvature of an image side surface of the fifth lens.
Further, the optical lens satisfies the following conditional expression:
；
where R52 represents a radius of curvature of an image side surface of the fifth lens, and Idx5 represents a refractive index of the fifth lens.
Further, the optical lens satisfies the following conditional expression:
；
where f345 represents the combined effective focal length of the third lens, the fourth lens and the fifth lens, and BFL represents the distance from the image side surface to the imaging surface of the fifth lens.
The invention has the beneficial effects that: as can be seen from the above description of the present invention, compared with the prior art, the light beam on the object side of the optical lens of the present invention is converged by the first lens and the second lens, then enters the light incident side of the plastic prism, is reflected by the reflecting surface of the prism, so that the optical axis turns 90 °, then sequentially enters the third lens to the fifth lens, and finally passes through the filtering treatment of the optical filter, thereby completing the image acquisition on the photosensitive chip. The fifth lens can horizontally move to realize focusing at a shorter distance, the focusing distance is 35cm, and the moving distance of the lens is smaller than 0.5mm, so that the effects of compatibility of long-focus section and short-distance shooting and miniaturization are realized.
Drawings
Fig. 1 shows a schematic configuration diagram of an optical lens according to embodiment 1 of the present application in a telephoto state;
FIG. 2 shows an on-axis chromatic aberration plot of the optical lens of FIG. 1;
FIG. 3 shows a distortion plot of the optical lens of FIG. 1;
FIG. 4 shows a chromatic aberration of magnification plot for the optical lens of FIG. 1;
fig. 5 shows a schematic configuration diagram of an optical lens according to embodiment 1 of the present application in a close-up state;
FIG. 6 shows an on-axis chromatic aberration plot of the optical lens of FIG. 5;
FIG. 7 shows a distortion plot of the optical lens of FIG. 5;
FIG. 8 shows a chromatic aberration of magnification plot for the optical lens of FIG. 5;
fig. 9 shows a schematic configuration diagram of an optical lens according to embodiment 2 of the present application in a telephoto state;
FIG. 10 shows an on-axis chromatic aberration plot of the optical lens of FIG. 9;
FIG. 11 shows a distortion plot of the optical lens of FIG. 9;
FIG. 12 shows a chromatic aberration of magnification plot for the optical lens of FIG. 9;
fig. 13 is a schematic diagram showing the structure of an optical lens according to embodiment 2 of the present application in a close-up state;
FIG. 14 shows an on-axis chromatic aberration plot of the optical lens of FIG. 13;
FIG. 15 shows a distortion plot of the optical lens of FIG. 13;
fig. 16 shows a chromatic aberration of magnification graph of the optical lens of fig. 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In a preferred embodiment of the present invention, an optical lens includes, in order from an object side to an image side along an optical axis:
a diaphragm;
a first lens having positive optical power;
a second lens having negative optical power;
the included angle between the reflecting surface of the prism and the optical axis is 45 degrees;
a third lens having positive optical power;
a fourth lens having positive optical power;
a fifth lens having negative optical power; the fifth lens is movable along the optical axis, and the moving distance of the fifth lens is less than 0.5mm.
The light beam on the object side of the optical lens is converged by the first lens and the second lens, enters the light entering side of the plastic prism, is reflected by the reflecting surface of the prism, enables the optical axis to turn 90 degrees, then sequentially enters the third lens to the fifth lens, and finally achieves the purpose of completing image acquisition on the photosensitive chip through the filtering treatment of the optical filter. The fifth lens can horizontally move to realize focusing at a shorter distance, the focusing distance is 35cm, and the moving distance of the lens is smaller than 0.5mm, so that the effects of compatibility of long-focus section and short-distance shooting and miniaturization are realized.
In some embodiments, the fifth lens can be moved up and down along the optical axis to switch from a long-distance shooting state (telephoto state) to a short-distance shooting state (close-up state), and has good shooting effect in both states. The short-distance focusing distance is 35cm, and the moving distance of the fifth lens is less than 0.5mm; in contrast, the first lens, the second lens, the third lens, and the fourth lens are formed as a fixed lens group, which does not move when the optical lens is focused, and the optical power of the fixed lens group is positive.
As a preferred embodiment of the invention, it may also have the following additional technical features:
in this embodiment, the combined power of the first lens and the second lens is positive, and the combined power of the third lens, the fourth lens, and the fifth lens is negative.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first lens and the second lens, and f345 denotes a combined effective focal length of the third lens, the fourth lens, and the fifth lens. The optical lens meeting the condition can control the focal power of the front lens of the prism, is favorable for converging light rays entering the optical system and reasonably forms a large aperture light beam; the divergence degree of the light beam on the light incident surface of the prism is controlled, and then the size of the prism with smaller size is set. In addition, the aperture of the lens behind the prism light-emitting measurement can be reduced by placing a lens with positive focal power in front of the object side surface of the prism with limited size; by controlling the reasonable distribution of the focal power of the optical lens, the optical system can realize the large aperture of the long-focus lens and obtain better solution for aberration correction and performance requirements for high-quality imaging.
In this embodiment, the refractive index of the prism is between 1.5 and 1.6, and the abbe number of the prism is between 50 and 60. The prism is made of plastic, and the plastic prism with the refractive index specification can be produced in batches by adopting an injection molding process, so that the cost of the lens and the weight of the prism are greatly reduced. Due to the weight reduction of the prism, the prism anti-shake in the long-focus module is more facilitated, and therefore the imaging effect of higher quality is improved.
In this embodiment, the optical lens satisfies the following conditional expression:
；
wherein CT3 represents the center thickness of the third lens on the optical axis, CT4 represents the center thickness of the fourth lens on the optical axis, CT5 represents the center thickness of the fifth lens on the optical axis, T34 represents the distance between the third lens and the fourth lens in the optical axis direction, and T45 represents the distance between the fourth lens and the fifth lens in the optical axis. The lens on the side surface of the prism image can be controlled to have the center thickness on the optical axis and the air interval between the two lenses, so that the length of the optical lens in the vertical direction of the mobile phone can be effectively reduced, the higher space utilization rate is improved, and in addition, the assembly difficulty of the camera module can be reduced.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first and second lenses, and PrL denotes an on-axis distance from an image side of the prism to an object side of the third lens. The lens aberration can be better corrected by controlling the ratio of the focal length of the prism image side lens to the distance from the prism light-emitting surface to the object side surface of the third lens on the axis, the imaging effect with higher quality is ensured, the prism and the lens can be prevented from interfering in structural installation, and enough space is provided for adopting the prism anti-shake in the photographing module.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where PrL denotes an on-axis distance from an image side surface of the prism to an object side surface of the third lens element, and IH denotes a maximum half image height on an imaging plane of the optical lens. The ratio of the on-axis distance from the image side surface of the prism to the object side surface of the third lens to the image height can be controlled by meeting the condition, and after the object side beam is compressed by the first lens and the second lens and enters the prism for reflection, the divergence angle of the light emergent part of the prism can be controlled, so that the assembly difficulty of the prism and the lens is reduced while the effective aperture of the subsequent lens is effectively controlled.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where f represents an effective focal length of the optical lens, and R52 represents a radius of curvature of an image side surface of the fifth lens.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where R52 represents a radius of curvature of an image side surface of the fifth lens, and Idx5 represents a refractive index of the fifth lens.
Satisfies the conditional expression that-0.4 is less than f/R52 is less than 2.5, -41 is less than R52/Idx5 is less than 6. The ratio of the effective focal length of the optical lens to the curvature radius of the image side surface of the fifth lens and the ratio of the curvature radius to the refractive index of the fifth lens can be controlled, so that the fifth lens can be distributed with reasonable negative focal power, the optical lens can better balance aberration, imaging light can be smoothly transmitted into the image sensor to stably image, and meanwhile, the short-distance clear shooting effect of the fifth lens can be achieved under the movement of a small stroke.
In this embodiment, the optical lens satisfies the following conditional expression:
；
where f345 represents the combined effective focal length of the third lens, the fourth lens and the fifth lens, and BFL represents the distance from the image side surface to the imaging surface of the fifth lens. The lens has the advantages that the lens meets the condition, the balance between good imaging quality and optical back focal length easy to assemble is facilitated, the focal length is reasonably distributed, smooth transition of light is guaranteed, and meanwhile enough space is reserved for installation of a camera module motor and moving focusing travel of a lens.
For better optical performance of the system, a plurality of aspheric lenses are adopted in the lens, and the shape of each aspheric surface of the optical lens meets the following equation:
；
wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, and A, B, C, D, E, F, G, H, E, F is the second, fourth, sixth, eighth, tenth, fourteen, sixteen, eighteen, twenty-order surface coefficients respectively.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
Referring to fig. 1 and 5, there are shown schematic diagrams of the optical lens provided in embodiment 1 of the present invention for long-distance and short-distance photographing,
the optical lens sequentially comprises from an object side to an imaging surface along an optical axis: the aperture ST, the first lens L1, the second lens L2, the prism Pr, the third lens L3, the fourth lens L4, the fifth lens L5, and the filter G1 may have an air space between any two adjacent lenses.
The first lens L1 with positive focal power has a convex object side and a concave image side; and the object side surface and the image side surface are both aspheric.
The object-side surface of the second lens element L2 with negative focal power is convex, the image-side surface of the second lens element L2 is concave, and both the object-side surface and the image-side surface of the second lens element L are aspheric.
The reflecting surface of the plastic prism Pr with optical power forms an included angle of 45 degrees with the optical axis, so that the light rays incident on the object side surface PS1 perpendicular to the plastic prism Pr are deflected by 90 degrees and then pass through the prism Pr.
The third lens element L3 with positive focal power has convex object-side and image-side surfaces, and both the object-side and image-side surfaces are aspheric;
the object-side surface of the fourth lens element L4 with positive refractive power is concave, the image-side surface of the fourth lens element L4 is convex, and both the object-side surface and the image-side surface of the fourth lens element L are aspheric.
The object-side surface and the image-side surface of the fifth lens element L5 with negative focal power are concave, and the object-side surface and the image-side surface are aspheric.
The fifth lens can move up and down along the optical axis to achieve good shooting effect on a short distance, the focusing distance of the short distance is 35cm, and the moving distance of the fifth lens is smaller than 0.5mm; in contrast, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are formed as a fixed lens group, and the optical power of the fixed lens group is positive without moving when the optical lens is focused.
Specifically, fig. 1 and 5 are schematic diagrams of optical systems in which the optical lens is focused at infinity (i.e., a telephoto state) and at 35cm (i.e., a close-up state), respectively. When the optical lens is focused at infinity, the distance on the optical axis between the object side surface S31 of the third lens element L3 and the image side surface S52 of the fifth lens element L5 is minimized.
The relevant parameters of each lens in the optical lens of the first embodiment are shown in table 1. The half field of view of the optical lens is 3.806mm, the effective focal length is 19.9 mm, and the aperture value is 2.7.
The relevant parameters of each lens in the optical lens in example 1 are shown in table 1.
TABLE 1
The high order parameters of the aspherical lens of the optical lens in embodiment 1 are shown in table 2:
TABLE 2
The variable pitch values H1, H2, H3 of the optical lens in embodiment 1 in two different photographing states of telephoto and close-up are as shown in table 3:
TABLE 3 Table 3
When the optical lens in example 1 photographs an object at infinity (i.e., a telephoto state, H1 in table three is infinity), H2 is-0.359 mm and H3 is-4.353 mm, corresponding to the optical structure shown in fig. 1. And when the optical lens photographs an object at 35cm (i.e., a close-up state, H1 in table three is 350 mm), H2 is-0.859 mm, and H3 is-3.853 mm, corresponding to the optical structure shown in fig. 5. The switching of the two shooting states is completed by the fact that the fifth lens moves 0.5mm on the shaft, the moving amount is small, and the realization of the module motor is easier.
Referring to fig. 2 to 4 in combination, fig. 2 shows on-axis chromatic aberration curves of the telephoto state of the optical lens in embodiment 1, which represent the deviation of the converging focal point of light rays of different wavelengths after passing through the lens. The horizontal axis represents the offset (in mm) and the vertical axis represents the normalized light diameter.
Fig. 3 shows an F-Tan θ distortion curve of the telephoto state of the optical lens in example 1, which represents the F-Tan θ distortion of light rays of 0.55 wavelength at different image heights on the imaging plane, the horizontal axis representing the F-Tan θ distortion (unit: percent), and the vertical axis representing the half image height (unit: millimeter).
Fig. 4 shows a magnification chromatic aberration curve of the telephoto state of the optical lens in embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. The horizontal axis represents the offset (in microns) and the vertical axis represents the normalized field of view.
As can be seen from fig. 2 to 4, the optical lens in embodiment 1 has a good balance of various aberrations in the telephoto state, and can achieve good imaging quality.
Referring to fig. 6 to 8, fig. 6 shows on-axis chromatic aberration curves of the optical lens in the close-up state in embodiment 1, which represent the deviation of the converging focus of the light rays of different wavelengths after passing through the lens. The horizontal axis represents the offset (in mm) and the vertical axis represents the normalized light diameter.
Fig. 7 shows an F-Tan θ distortion curve of the optical lens in the close-up state in example 1, which represents F-Tan θ distortion of light of 0.55 wavelength at different image heights on the imaging plane, the horizontal axis represents F-Tan θ distortion (unit: percent), and the vertical axis represents half image height (unit: millimeter).
Fig. 8 shows a magnification chromatic aberration curve of the optical lens in the close-up state in embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. The horizontal axis represents the offset (in microns) and the vertical axis represents the normalized field of view.
As can be seen from fig. 6 to 8, the optical lens in embodiment 1 has a good balance of various aberrations in the close-up state, and can achieve good imaging quality.
Referring to fig. 9 and fig. 13, there are respectively shown schematic structural diagrams of an optical lens for photographing a long distance and a short distance according to embodiment 2 of the present invention, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: the aperture ST, the first lens L1, the second lens L2, the prism Pr, the third lens L3, the fourth lens L4, the fifth lens L5 and the optical filter G1, and any two adjacent lenses can have an air interval.
The first lens L1 with positive focal power has a convex object side and a concave image side; and the object side surface and the image side surface are both aspheric.
The object-side surface of the second lens element L2 with negative focal power is convex, the image-side surface of the second lens element L2 is concave, and both the object-side surface and the image-side surface of the second lens element L are aspheric.
The reflecting surface of the plastic prism Pr with optical power forms an included angle of 45 degrees with the optical axis, so that the light rays incident on the object side surface PS1 perpendicular to the plastic prism Pr are deflected by 90 degrees and then pass through the prism Pr.
The third lens element L3 with positive focal power has convex object-side and image-side surfaces, and both the object-side and image-side surfaces are aspheric;
the object-side surface of the fourth lens element L4 with positive refractive power is concave, the image-side surface of the fourth lens element L4 is convex, and both the object-side surface and the image-side surface of the fourth lens element L are aspheric.
The object-side surface and the image-side surface of the fifth lens element L5 with negative focal power are concave, and the object-side surface and the image-side surface are aspheric.
The fifth lens can move up and down along the optical axis to achieve clear shooting effect on a short distance, the shortest focusing distance is 35cm, and the moving distance of the fifth lens is less than 0.5mm; in contrast, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are formed as a fixed lens group, and the optical power of the fixed lens group is positive without moving when the optical lens is focused.
Specifically, fig. 9 and 13 are schematic diagrams of optical systems in which the optical lens is focused at infinity (i.e., a telephoto state) and at 35cm (i.e., a close-up state), respectively. When the optical lens is focused at infinity, the distance between the object side surface S31 of the third lens element L3 and the image side surface S52 of the fifth lens element L5 on the optical axis 2 is minimized.
The relevant parameters of each lens in the optical lens of example 2 are shown in table 4. The half field of view of the optical lens is 3.897mm, the effective focal length is 20.5mm, and the aperture value is 2.8.
The relevant parameters of each lens in the optical lens in example 2 are shown in table 4.
TABLE 4 Table 4
The high order parameters of the aspherical lens of the optical lens in example 2 are shown in table 5:
TABLE 5
The variable pitch values H1, H2, H3 of the optical lens in embodiment 2 in two different photographing states of telephoto and close-up are as shown in table 6:
TABLE 6
When the optical lens in example 2 photographs an object at infinity (i.e., a telephoto state, H1 in table 6 is infinity), H2 is-0.812 mm and H3 is-4.405 mm, corresponding to the optical structure shown in fig. 9. Whereas when the optical lens photographs an object at 35cm (i.e., a close-up state, H1 in table 6 is 350 mm), H2 is-1.312 mm, and H3 is-3.905 mm, corresponding to the optical structure shown in fig. 13. The switching of the two shooting states is completed by the fact that the fifth lens moves 0.5mm on the shaft, the moving amount is small, and the realization of the module motor is easier.
Fig. 10 shows an on-axis chromatic aberration curve of the telephoto state of the optical lens in embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. The horizontal axis represents the offset (in mm) and the vertical axis represents the normalized light diameter.
Fig. 11 shows an F-Tan θ distortion curve of the telephoto state of the optical lens in example 2, which represents the F-Tan θ distortion of the light ray of 0.55 wavelength at different image heights on the imaging plane, the horizontal axis representing the F-Tan θ distortion (unit: percent), and the vertical axis representing the half image height (unit: millimeter).
Fig. 12 shows a magnification chromatic aberration curve of the telephoto state of the optical lens in embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. The horizontal axis represents the offset (in microns) and the vertical axis represents the normalized field of view.
As can be seen from fig. 10 to 12, the optical lens in embodiment 2 has a good balance of various aberrations in the telephoto state, and can achieve good imaging quality.
Referring to fig. 14 to 16 in combination, fig. 14 shows on-axis chromatic aberration curves of the optical lens in the close-up state in embodiment 2, which represent the deviation of the converging focus of light rays of different wavelengths after passing through the lens. The horizontal axis represents the offset (in mm) and the vertical axis represents the normalized light diameter.
Fig. 15 shows an F-Tan θ distortion curve of the optical lens in the close-up state in example 2, which represents F-Tan θ distortion of light of 0.55 wavelength at different image heights on the imaging plane, the horizontal axis represents F-Tan θ distortion (unit: percent), and the vertical axis represents half image height (unit: millimeter).
Fig. 16 shows a magnification chromatic aberration curve of the optical lens in the close-up state in embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. The horizontal axis represents the offset (in microns) and the vertical axis represents the normalized field of view.
As can be seen from fig. 14 to 16, the optical lens in embodiment 2 has a good balance of various aberrations in the close-up state, and can achieve good imaging quality.
Referring to table 10, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the f-number FNO, the real image height IH, the field angle FOV, and the numerical values corresponding to each of the conditional expressions in the above embodiments.
Table 10
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution and the modified concept thereof, within the scope of the present invention.
Claims (10)
1. An optical lens comprising, in order from an object side to an image side along an optical axis:
a diaphragm;
a first lens having positive optical power;
a second lens having negative optical power;
the included angle between the reflecting surface of the prism and the optical axis is 45 degrees;
a third lens having positive optical power;
a fourth lens having positive optical power;
a fifth lens having negative optical power; the fifth lens is movable along the optical axis, and the moving distance of the fifth lens is less than 0.5mm.
2. The optical lens of claim 1, wherein the combined power of the first lens and the second lens is positive, and the combined power of the third lens, the fourth lens, and the fifth lens is negative.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first lens and the second lens, and f345 denotes a combined effective focal length of the third lens, the fourth lens, and the fifth lens.
4. An optical lens according to claim 1, wherein the refractive index of the prism is between 1.5 and 1.6 and the abbe number of the prism is between 50 and 60.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
wherein CT3 represents the center thickness of the third lens on the optical axis, CT4 represents the center thickness of the fourth lens on the optical axis, CT5 represents the center thickness of the fifth lens on the optical axis, T34 represents the distance between the third lens and the fourth lens in the optical axis direction, and T45 represents the distance between the fourth lens and the fifth lens in the optical axis.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where f12 denotes a combined effective focal length of the first and second lenses, and PrL denotes an on-axis distance from an image side of the prism to an object side of the third lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where PrL denotes an on-axis distance from an image side surface of the prism to an object side surface of the third lens element, and IH denotes a maximum half image height on an imaging plane of the optical lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where f represents an effective focal length of the optical lens, and R52 represents a radius of curvature of an image side surface of the fifth lens.
9. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where R52 represents a radius of curvature of an image side surface of the fifth lens, and Idx5 represents a refractive index of the fifth lens.
10. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
；
where f345 represents the combined effective focal length of the third lens, the fourth lens and the fifth lens, and BFL represents the distance from the image side surface to the imaging surface of the fifth lens.
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| CN115576081A (en) * | 2022-10-14 | 2023-01-06 | Oppo广东移动通信有限公司 | Optical lens system, image capturing device and electronic equipment |
-
2024
- 2024-03-05 CN CN202410244586.XA patent/CN117826376B/en active Active
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|---|---|---|---|---|
| US5748383A (en) * | 1995-11-14 | 1998-05-05 | Nikon Corporation | Variable focal length optical system |
| CN1263272A (en) * | 1999-02-10 | 2000-08-16 | 株式会社尼康 | Zoom lens system |
| US7068429B1 (en) * | 2005-01-12 | 2006-06-27 | Fujinon Corporation | Zoom optical system with a vibration correction function and imaging device using the zoom optical system |
| CN102004303A (en) * | 2009-08-31 | 2011-04-06 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
| CN102914855A (en) * | 2011-08-04 | 2013-02-06 | 佳能株式会社 | Zoom lens and image pickup apparatus equipped with zoom lens |
| US20180188501A1 (en) * | 2016-12-29 | 2018-07-05 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system and portable electronic device including the same |
| CN208847952U (en) * | 2018-09-29 | 2019-05-10 | 辽宁中蓝电子科技有限公司 | A kind of periscopic capture optical lens group |
| CN115576081A (en) * | 2022-10-14 | 2023-01-06 | Oppo广东移动通信有限公司 | Optical lens system, image capturing device and electronic equipment |
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