CN113391426A - Lens, camera module and electronic equipment - Google Patents

Lens, camera module and electronic equipment Download PDF

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Publication number
CN113391426A
CN113391426A CN202010177146.9A CN202010177146A CN113391426A CN 113391426 A CN113391426 A CN 113391426A CN 202010177146 A CN202010177146 A CN 202010177146A CN 113391426 A CN113391426 A CN 113391426A
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China
Prior art keywords
lens
lens barrel
object side
camera module
focal length
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Granted
Application number
CN202010177146.9A
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Chinese (zh)
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CN113391426B (en
Inventor
叶海水
刘天宇
江依达
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202010177146.9A priority Critical patent/CN113391426B/en
Priority to PCT/CN2021/080507 priority patent/WO2021180211A1/en
Publication of CN113391426A publication Critical patent/CN113391426A/en
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application provides a camera lens, a camera module and electronic equipment to correct the optical chromatic aberration of the camera lens and improve the imaging effect. From the object side to the image side, the lens includes in order: a first lens having a positive refractive power; a second lens having a negative focal power; a third lens having a positive refractive power; the fourth lens has negative focal power, the fourth lens and the third lens form a double-cemented lens, and the double-cemented lens has positive focal power; and a fifth lens having a negative power.

Description

Lens, camera module and electronic equipment
Technical Field
The application relates to the technical field of electronic equipment, in particular to a lens, a camera module and electronic equipment.
Background
In order to enhance the competitiveness of electronic devices such as mobile phones and tablet computers, the integrated telephoto lens has become one of the main development trends of the current electronic devices. The telephoto lens has a long focal length and a small viewing angle, and a space range of a shot scene is relatively small, and an image larger than that of a standard lens can be discharged at the same shooting distance, so that the telephoto lens is suitable for shooting distant scenes and scenes which are not easy to approach to shooting. In the prior art, because the optical path of the telephoto lens is long, it is often difficult to focus light rays with different wavelengths on the same point during design, resulting in large chromatic aberration of the formed image and affecting the imaging quality.
Disclosure of Invention
The application provides a lens, a camera module and electronic equipment for correcting the optical chromatic aberration of the lens and improving the imaging effect.
In a first aspect, the present application provides a lens barrel including a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, the five lens elements being sequentially disposed from an object side to an image side, the first lens element being a lens element closest to an object, and the fifth lens element being a lens element closest to an image plane of the lens barrel. In the specific setting, the first lens has positive focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has negative focal power, and the fifth lens has negative focal power, wherein the third lens and the fourth lens can be combined to form a double-cemented lens with the effect of inhibiting chromatic aberration, and the double-cemented lens has positive focal power.
In the scheme, through reasonably distributing the focal power of each lens and adopting the design of the double-cemented lens, the lens has good imaging effect on monochromatic light with each wavelength in a wide waveband range of visible light, the optical chromatic aberration of the lens is effectively corrected, and the imaging quality of the lens is improved.
In a specific embodiment, the equivalent focal length of the lens can be designed to be not less than 90 mm.
In a specific embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the lens barrel and the effective focal length f of the lens barrel satisfy: TTL/f is more than or equal to 0.75 and less than or equal to 1 so as to obtain relatively smaller total length of the lens and reduce the overall size of the lens.
In a specific embodiment, the third lens and the fourth lens form a double cemented lensEffective focal length f of34And the effective focal length f of the lens satisfies the following conditions: f is not less than 034The/f is less than or equal to 1. Through setting up reasonable focal length distribution proportion, can control the size of camera lens effectively to be favorable to promoting the stability of performance of camera lens.
In a particular embodiment, the temperature coefficient of refractive index (dn/dt) of at least one lens satisfies: -9X 10-5≤(dn/dt)≤9×10-5. The lens is made of a material with a lower temperature coefficient of refractive index, so that the temperature drift coefficient of the lens can be reduced, and the temperature effect of the lens can be improved.
When the surface type of each lens is specifically set, the position of an object side surface of the first lens, which enters an optical axis, is a convex surface so as to improve the convergence capacity of light rays and reduce the total length of the lens; the position of the image side surface of the first lens entering the optical axis can be a convex surface or a concave surface;
the position of the object side surface and the position of the image side surface of the second lens entering the optical axis can be both designed to be concave;
the position of the object side surface and the position of the image side surface of the third lens entering the optical axis can be both designed to be convex;
the position of an object side surface and an image side surface of the fourth lens entering an optical axis can be designed to be concave;
the optical axis of the object side surface of the fifth lens element can be convex, and the optical axis of the image side surface of the fifth lens element can be concave.
In a specific embodiment, the third lens and the fourth lens can be made of glass respectively, so that chromatic aberration can be further eliminated, the temperature effect of the lens can be suppressed, the sensitivity of the effective focal length of the lens to temperature is reduced, and the imaging quality of the lens is improved.
In order to reduce the difficulty of the manufacturing process of the lens, the third lens and the fourth lens can be spherical lenses respectively.
In some possible embodiments, the first lens element may be an aspheric lens element to reduce spherical aberration and improve imaging quality of the lens barrel, and at this time, the first lens element may be made of a resin material to reduce difficulty in manufacturing process and manufacturing cost of the lens barrel.
Of course, in some other embodiments, the second lens and the fifth lens may be designed to be aspheric lenses and made of resin materials, which are not described herein again.
In some possible embodiments, the lens further includes an aperture stop, which may be specifically disposed on the object side of the first lens to limit the size of the incident beam to control the depth of field.
In some possible embodiments, the lens further includes a filter, which may be specifically disposed on an image side of the fifth lens, for filtering infrared light in the light, so as to improve effective resolution and color reproducibility of the lens, and make an image more clear.
In addition, the lens can further comprise a vignetting diaphragm, and the vignetting diaphragm can be arranged on the object side or the image side of the first lens. The vignetting diaphragm can reduce the clear aperture of the marginal field of view by blocking partial light beams emitted by the object points outside the optical axis, thereby reducing the outer diameter size of the lens.
The second aspect, this application still provides a camera module, this camera module includes the casing, photosensitive element, the camera lens in base plate and the aforesaid arbitrary possible embodiment, the light inlet has been seted up on the casing, photosensitive element, base plate and camera lens can set up respectively in the casing, photosensitive element sets up in the imaging surface of camera lens, can be used to the light signal conversion to incident ray is the signal of telecommunication, the base plate then sets up in one side that photosensitive element deviates from the camera lens, be used for bearing photosensitive element, and can be with the signal of telecommunication transmission to electronic equipment's mainboard of conversion, in order to realize functions such as the acquisition, conversion and processing to optical image. Because the optical chromatic aberration of the lens can be effectively inhibited, the imaging quality of the camera module is also improved.
The third aspect, this application embodiment still provides an electronic equipment, and this electronic equipment includes the camera module among casing and the aforementioned embodiment, and the camera module specifically can set up in the casing, and the trompil has been seted up to the position that corresponds the light inlet of camera module on the casing, and light accessible trompil jets into in the camera module. The image quality shot by the electronic equipment is high.
Drawings
Fig. 1 is a schematic structural diagram of a lens provided in an embodiment of the present application;
FIG. 2a is a vertical axis chromatic aberration diagram of the lens of the embodiment shown in FIG. 1;
FIG. 2b is a diagram of axial chromatic aberration of the lens of the embodiment shown in FIG. 1;
fig. 3 is a schematic structural diagram of a lens barrel according to another embodiment of the present application;
FIG. 4a is a vertical axis chromatic aberration diagram of the lens of the embodiment shown in FIG. 3;
FIG. 4b is a diagram of axial chromatic aberration of the lens of the embodiment shown in FIG. 3;
fig. 5 is a schematic structural diagram of a lens barrel according to another embodiment of the present application;
FIG. 6a is a vertical axis chromatic aberration diagram of the lens of the embodiment shown in FIG. 5;
FIG. 6b is a diagram of axial chromatic aberration of the lens of the embodiment shown in FIG. 5;
fig. 7 is a schematic structural diagram of a camera module according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Reference numerals:
100-a camera module; 200-an electronic device; 10-a lens; 20-a housing; 21-a light inlet; 30-a photosensitive element;
40-a substrate; 50-a light-turning prism; 210-a housing; 220-opening a hole;
l1-first lens; l2-second lens; l3-third lens; l4-fourth lens; l5-fifth lens;
STO-aperture stop; g1-optical filter;
s1 — the object side surface of the first lens; s2 — an image side surface of the first lens;
s3 — the object side surface of the second lens; s4 — an image side surface of the second lens;
s5 — object side surface of third lens; s6 — an image side surface of the third lens;
s7 — object side surface of fourth lens; s8 — an image side surface of the fourth lens;
s9-the object side surface of the fifth lens; s10 — an image side surface of the fifth lens;
s11-the object side surface of the filter; s12-the image side surface of the filter;
s13 — image plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
In order to facilitate understanding of the shots provided in the embodiments of the present application, an application scenario thereof is first described below. The lens provided by the embodiment of the application can be applied to a camera module of electronic equipment and used for enabling the electronic equipment to realize functions such as image acquisition and video acquisition, wherein the electronic equipment can be a mobile phone, a tablet computer or a notebook computer and other common terminals in the prior art. Cameras are various, and for example, the cameras can be divided into a standard lens, a wide-angle lens, a telephoto lens and the like according to the size of a focal length value, wherein the telephoto lens has the characteristics of long focal length and small visual angle, so that the space range of a shot scene is small, and an image larger than that of the standard lens can be shot at the same shooting distance, and therefore, the cameras are more suitable for shooting distant objects; however, since the optical path of a general telephoto lens is long, it is difficult to focus light rays with different wavelengths on the same point, which causes large chromatic aberration of the formed image and affects the imaging quality.
In addition, the telephoto lens configured on the current terminal device usually adopts a multi-piece all-plastic lens structure, such as a 4p lens, a 5p lens, a 6p lens, and even a 7p lens. Because the shape, thickness and other parameters of the plastic lens can change slightly along with the difference of temperature, the refractive index of the plastic lens also changes correspondingly, and then the focus of the lens drifts, namely the temperature drift phenomenon occurs, and the temperature drift phenomenon is more obvious along with the increase of the focal length of the lens, and the imaging quality of the lens is seriously influenced. For the problem, one solution in the prior art is to compensate the focus drift of the lens by using the voice coil motor, but this requires the voice coil motor to design an additional stroke, i.e. the total stroke of the voice coil motor needs to be increased, so that the power consumption and the design difficulty of the whole module can be increased; the other scheme is to compensate the temperature drift by using an algorithm, which needs to increase the computing power of an electronic device ISP (image signal processing unit), and also needs to ensure the temperature drift stability of a hardware system, so that the compensation effect is relatively limited.
Based on this, the embodiment of the application provides a lens, and the lens can correct optical chromatic aberration of the lens and suppress a temperature effect by reasonably designing and optimizing the focal power, the surface type, the material and the like of each lens, and is beneficial to improving the imaging effect of a camera module applying the lens.
For the sake of easy understanding, the related noun concepts referred to in the embodiments of the present application will be briefly described. In the embodiment of the present application, the object side may be understood as a side close to an object to be photographed, and the image side may be understood as a side close to an imaging plane; the object side surface of the lens is a side surface of the lens close to an object to be shot, and correspondingly, the image side surface of the lens is a side surface of the lens close to an imaging surface; near the optical axis can be understood as the area of the lens surface close to the optical axis.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a lens 10 according to an embodiment of the present disclosure. The lens barrel 10 includes five lenses, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are arranged in order from the object side to the image side along the optical axis, and the first lens L1 is a lens closest to an object and the fifth lens L5 is a lens closest to an image forming surface.
In the embodiment of the present application, the equivalent focal length f of the lenseqvAnd specifically can be designed to be not less than 90 mm. Equivalent focal length feqvWhen the length of the diagonal line of the photosensitive area of the photosensitive element of the camera module is equivalent to the length of the diagonal line of the 35mm camera frame (42.27mm), the relationship between the focal length of the 35mm camera lens corresponding to the actual focal length of the lens and the effective focal length f of the lens is as follows:
Figure BDA0002411191460000041
wherein ImgH is the maximum image height of the lens, i.e. half of the diagonal length of the photosensitive area of the photosensitive element.
In addition to the above elements, the lens 10 may further include an aperture stop STO, which may be particularly located on the object side of the first lens L1 to limit the size of an incident beam and control the depth of field. In addition, the lens 10 may further include a filter G1 located on the image side of the fifth lens L5, and the filter G1 may be used to filter infrared light in the light, so as to improve the effective resolution and color reproducibility of the lens, and make the image more clear and stable.
In addition, the lens can also comprise a vignetting diaphragm arranged on the object side of the first lens, and partial light beams emitted by the object point outside the optical axis can be shielded by the vignetting diaphragm, so that the clear aperture of the marginal field of view can be reduced, and the outer diameter size of the lens can be reduced. It is understood that in other embodiments of the present application, a vignetting stop may be disposed on the image side of the first lens, which may also achieve the purpose of reducing the outer diameter size of the lens.
With reference to fig. 1, in the embodiment of the present application, the first lens element L1 has positive refractive power, the object-side surface of the first lens element L1 may be convex at the paraxial region thereof to improve the convergence of the light rays at the object side and reduce the overall length of the lens assembly 10, and the image-side surface of the first lens element L1 may also be convex at the paraxial region thereof;
the second lens L2 has negative focal power, and in particular, both the object side surface and the image side surface of the second lens L2 can be concave at the paraxial region;
the third lens L3 has positive refractive power, and both the object-side surface and the image-side surface of the third lens L3 may be convex at the paraxial region; the fourth lens L4 has negative power, and both the object-side surface and the image-side surface of the fourth lens L4 may be concave at the paraxial region. In the embodiment of the present application, the image side surface of the third lens L3 and the object side surface of the fourth lens L4 can be adhesively connected, so that the two lenses are combined to form a double cemented lens, thereby effectively inhibiting the optical chromatic aberration of the lens, and facilitating the lens to obtain a better imaging effect;
the fifth lens L5 has negative power, and in particular, the object side surface of the fifth lens L5 may be convex at the paraxial region and the image side surface may be concave at the paraxial region.
In the above embodiments, the image side surface and the object side surface of the first lens element L1 through the fifth lens element L5 may be aspheric surfaces to eliminate spherical aberration and improve the imaging quality of the lens barrel 10, and at this time, each lens element may be made of resin material to reduce the difficulty of the manufacturing process of the lens barrel 10 and reduce the manufacturing cost.
Of course, in other embodiments of the present disclosure, the third lens L3 and the fourth lens L4 may be made of glass, for example, the third lens L3 may be made of crown glass, and the fourth lens L4 may be made of flint glass, so as to not only further eliminate chromatic aberration, but also suppress the temperature effect of the lens 10, reduce the sensitivity of the effective focal length of the lens 10 to temperature, and improve the MTF (modulation transfer function) quality of the lens. At this time, the image side surface and the object side surface of the third lens element L3 and the fourth lens element L4 can be designed as spherical structures to reduce the difficulty of the manufacturing process; the first lens element L2, the second lens element L2 and the fifth lens element L5 are made of resin, and the image side surface and the object side surface thereof are aspheric.
In the embodiment of the present application, the aspherical surface shape of each lens can satisfy the following equation:
Figure BDA0002411191460000042
wherein r is the perpendicular distance between the point on the aspheric surface and the optical axis, Z is the rise from the optical axis to the point r on the aspheric surface, c is the paraxial curvature, K is the conic constant, and alphaiIs the I-th order aspheric coefficient.
In addition, the lens barrel 10 according to the embodiment of the present application further satisfies the following relational expression:
0.75≤TTL/f≤1
where TTL is the distance on the optical axis from the object side surface of the first lens element L1 to the image plane, i.e. the total length of the lens barrel, and f is the effective focal length of the lens barrel 10 according to the embodiment of the present application. Under the condition, the total lens length TTL can be obtained, and the miniaturization design of the lens is favorably realized.
In a specific embodiment, the first lens L1 has an Abbe number V1And the Abbe number V of the second lens L22Can respectively satisfy:
15≤V1≤100，15≤V2≤100
through setting up reasonable dispersion coefficient, cooperate the focal power distribution of each lens in the aforesaid scheme, can effectively rectify the spectrum, less focus distance difference of different wavelength light to can effectively improve the MTF value of different monochromatic light in the visible light scope, make the camera lens can further all have good formation of image effect to the monochromatic light of each wavelength in the wave band scope of visible light broad.
Further, in the present embodiment, when the third lens L3 is made of glass, the temperature coefficient of refractive index (dn/dt) of the third lens L33Satisfies the following conditions:
-9×10-5≤(dn/dt)3≤9×10-5
the refractive index temperature coefficient represents the coefficient of the refractive index of the material in the medium such as air, which changes with the temperature, and the temperature drift coefficient of the lens can be reduced by adopting the glass material with the lower refractive index temperature coefficient for the third lens L3, thereby being beneficial to improving the temperature effect of the lens. The temperature drift coefficient can be defined as Δ f/. DELTA.T, where Δ T is the temperature variation of the environment where the lens is located, and Δ f is the variation of the focal length of the lens.
Of course, in other embodiments of the present application, the temperature coefficient of refractive index (dn/dt) of the fourth lens L4 is further reduced in order to further reduce the temperature drift coefficient of the lens4It can also satisfy:
-9×10-5≤(dn/dt)4≤9×10-5
by controlling the temperature coefficients of the refractive indexes of the third lens L3 and the fourth lens L4 and combining the arrangement mode of the lenses in the scheme, the temperature drift coefficient delta f/delta T of the lens can be lowered to 8 mu m/DEG C-15 mu m/DEG C, so that the temperature effect of the lens can be effectively improved.
Further, the focal length f of the double cemented lens constituted by the third lens L3 and the fourth lens L434And the effective focal length f of the lens satisfies the following conditions: f is not less than 034The/f is less than or equal to 1. Through setting up reasonable focal length distribution proportion, can control the size of camera lens effectively to be favorable to promoting the stability of performance of camera lens.
Referring to table 1, table 1 shows the parameters associated with each lens of the lens system of the embodiment shown in fig. 1.
Table 1:
Figure BDA0002411191460000051
Figure BDA0002411191460000061
referring to table 2, table 2 shows aspheric parameters of each lens of the lens system of the embodiment shown in fig. 1.
Table 2:
flour mark K α4 α6 α8
S1 -1.04E-09 -1.06E-04 1.49E-04 1.01E-05
S2 8.49E-10 -8.73E-04 6.54E-04 2.11E-04
S3 -1.05E-09 -6.67E-03 4.36E-03 -7.33E-04
S4 -6.03E-10 -6.27E-03 4.22E-03 -8.25E-04
S5
0 0 0 0
S6 0 0 0 0
S7 0 0 0 0
S8 0 0 0 0
S9 8.49E-10 -6.18E-02 -9.36E-03 3.76E-03
S10 -5.90E-10 -5.83E-02 6.89E-04 1.62E-03
Referring to table 3, table 3 shows parameters of the total length TTL, the maximum image height ImgH, and the focal length of each lens in the embodiment shown in fig. 1. Where f is the focal length of the lens 10, and f1Is the focal length, f, of the first lens L12Is the focal length, f, of the second lens L23Is the focal length, f, of the third lens L34Is the focal length, f, of the fourth lens L45Is the focal length of the fifth lens L5.
Table 3:
parameter (mm) TTL ImgH f f1 f2 f3 f4 f5
Numerical value 12.7 2.8 14.50 4.92 -3.64 4.51 -14.23 -38.38
Referring to fig. 2a and 2b, fig. 2a is a vertical axis chromatic aberration diagram of the lens in the embodiment shown in fig. 1, and fig. 2b is an axial chromatic aberration diagram of the lens in the embodiment shown in fig. 1. It can be seen that through reasonable focal power distribution and dispersion coefficient selection, the surface type of each lens is reasonably optimized, the vertical axis chromatic aberration of the lens can be reduced to be less than 1.9um, the axial chromatic aberration is reduced to be less than 16um, and the vertical axis chromatic aberration and the axial chromatic aberration of the lens can be effectively corrected.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a lens barrel according to another embodiment of the present application. Similar to the previous embodiment, in this embodiment, the first lens L1 has positive optical power, and both the object side surface and the image side surface of the first lens L1 near the optical axis can be convex and aspheric; the second lens L2 has negative refractive power, and both the object-side surface and the image-side surface of the second lens L2 can be concave at the paraxial region and are aspheric; the third lens L3 has positive refractive power, and the object side surface and the image side surface of the third lens L3 both have a convex surface at the paraxial region and are spherical; the fourth lens L4 has negative focal power, the paraxial region of the object side surface and the image side surface of the fourth lens L4 can be concave and spherical, and the third lens L3 and the fourth lens L4 can be combined to form a double cemented lens; the fifth lens L5 has negative power, and the object side surface of the fifth lens L5 may be convex at the paraxial region and the image side surface may be concave at the paraxial region.
Similarly, in order to achieve a miniaturized design of the lens 10, in this embodiment, the total length TTL of the lens 10 satisfies:
0.75≤TTL/f≤1
in the embodiment of the present application, the surface type, material, refractive index, abbe number, aspheric parameters, and focal length of each lens are shown in tables 4 to 6.
Referring to table 4, table 4 shows the relevant parameters of each lens of the lens barrel in the embodiment shown in fig. 3.
Table 4:
flour mark Description of the invention Surface type Radius of curvature Thickness of Material of Refractive index Coefficient of dispersion
OBJ Article surface Plane surface All-round All-round
STO Aperture diaphragm Plane surface All-round -0.500
S1 First lens Aspherical surface 3.232 1.402 Resin composition 1.545 55.987
S2 Aspherical surface -15.393 0.403
S3 Second lens Aspherical surface -10.281 0.499 Resin composition 1.651 21.518
S4 Aspherical surface 3.040 0.274
S5 Third lens Spherical surface 3.914 1.277 Glass 1.717 29.510
S6 Spherical surface -3.914 0.000
S7 Fourth lens Spherical surface -3.914 0.500 Glass 1.589 61.163
S8 Spherical surface 3.914 1.959
S9 Fifth lens element Aspherical surface 26.692 0.500 Resin composition 1.566 37.426
S10 Aspherical surface 9.060 0.300
S12 Optical filter Plane surface All-round 0.210 -
S13 Plane surface All-round 5.348
S14 Image plane Plane surface All-round -
Referring to table 5, table 5 shows aspheric parameters of each lens of the lens system of the embodiment shown in fig. 3.
Table 5:
flour mark α4 α6 α8 α4
S1 -6.20E-10 -5.33E-04 1.99E-04 -4.54E-05
S2 1.66E-10 -1.13E-04 4.67E-05 5.90E-04
S3 -1.69E-11 -1.68E-02 9.49E-03 -2.04E-03
S4 -1.55E-11 -1.96E-02 1.19E-02 -3.54E-03
S5
0 0 0 0
S6 0 0 0 0
S7 0 0 0 0
S8 0 0 0 0
S9 -1.07E-02 -1.06E-03 5.14E-05 -4.61E-05
S10 -9.90E-03 -6.26E-04 1.02E-05 -1.86E-05
Referring to table 6, table 6 shows parameters of the total length TTL of the lens, the maximum image height ImgH, and the focal length of each lens in the embodiment shown in fig. 3.
Table 6:
parameter (mm) TTL ImgH f f1 f2 f3 f4 f5
Numerical value 12.7 2.8 14.50 5.02 -3.52 4.36 -22.03 -24.36
Referring to fig. 4a and 4b, fig. 4a is a vertical axis chromatic aberration diagram of the lens in the embodiment shown in fig. 3, and fig. 4b is an axial chromatic aberration diagram of the lens in the embodiment shown in fig. 3. It can be seen that through reasonable focal power distribution and dispersion coefficient selection, the surface type of each lens is reasonably optimized, the vertical axis chromatic aberration of the lens can be reduced to be less than 1.9um, the axial chromatic aberration is reduced to be less than 16um, and the vertical axis chromatic aberration and the axial chromatic aberration of the lens can be effectively corrected.
Referring to the drawings, fig. 5 is a schematic structural diagram of a lens barrel according to another embodiment of the present application. In this embodiment, the first lens element L1 has positive refractive power, and the object side surface of the first lens element L1 may be convex at the paraxial region thereof and the image side surface thereof may be concave at the paraxial region thereof, and both of them are aspheric; the second lens L2 has negative refractive power, and both the object-side surface and the image-side surface of the second lens L2 can be concave at the paraxial region and are aspheric; the third lens L3 has positive refractive power, and the object side surface and the image side surface of the third lens L3 both have a convex surface at the paraxial region and are spherical; the fourth lens L4 has negative focal power, the paraxial axes of the object side surface and the image side surface of the fourth lens L4 can be concave and spherical, and the third lens and the fourth lens can be combined to form a double-cemented lens; the fifth lens L5 has negative power, and the object side surface of the fifth lens L5 may be convex at the paraxial region and the image side surface may be concave at the paraxial region.
Similarly, in order to achieve a miniaturized design of the lens 10, in this embodiment, the total length TTL of the lens 10 satisfies:
0.75≤TTL/f≤1
in the embodiment of the present application, the surface type, material, refractive index, abbe number, aspheric parameters, and focal length of each lens are shown in tables 7 to 9.
Referring to table 7, table 7 shows the relevant parameters of each lens of the lens barrel in the embodiment shown in fig. 5.
Table 7 shows the parameters associated with each lens of the lens system of the embodiment shown in fig. 7.
Table 7:
flour mark Description of the invention Surface type Radius of curvature Thickness of Material of Refractive index Coefficient of dispersion
OBJ Article surface Plane surface All-round All-round
STO Aperture diaphragm Plane surface All-round -0.500
S1 First lens Aspherical surface 3.371 1.069 Resin composition 1.545 55.987
S2 Aspherical surface 27.689 1.008
S3 Second lens Aspherical surface -15.069 0.500 Resin composition 1.639 23.515
S4 Aspherical surface 3.423 0.321
S5 Third lens Spherical surface 3.623 1.267 Glass 1.717 29.510
S6 Spherical surface -8.606 0.000
S7 Fourth lens Spherical surface -8.606 0.500 Glass 1.589 61.163
S8 Spherical surface 6.102 2.986
S9 Fifth lens element Aspherical surface -9.224 0.500 Resin composition 1.566 37.426
S10 Aspherical surface -8.401 0.300
S12 Optical filter Plane surface All-round 0.210 -
S13 Plane surface All-round 5.348
S14 Image plane Plane surface All-round -
Referring to table 8, table 8 shows aspheric parameters of each lens of the lens system of the embodiment shown in fig. 5.
Table 8:
flour mark K α4 α6 α8
S1 -2.01E-03 3.69E-04 3.35E-05 1.60E-06
S2 -2.04E-03 1.90E-03 -1.41E-04 -4.69E-06
S3 2.29E-02 -3.57E-03 6.27E-05 -1.03E-05
S4 2.81E-02 -3.31E-03 -5.22E-04 9.96E-05
S5
0 0 0 0
S6 0 0 0 0
S7 0 0 0 0
S8 0 0 0 0
S9 -1.07E-02 -1.06E-03 5.14E-05 -4.61E-05
S10 -9.90E-03 -6.26E-04 1.02E-05 -1.86E-05
Referring to table 9, table 9 shows parameters of the total lens length TTL, the maximum image height ImgH, and the focal length of each lens in the embodiment shown in fig. 5.
Table 9:
parameter (mm) TTL ImgH f f1 f2 f3 f4 f5
Numerical value 14.0 2.8 14.47 6.92 -4.29 5.18 -23.91 118.28
Referring to fig. 6a and 6b, fig. 6a is a vertical axis chromatic aberration diagram of the lens in the embodiment shown in fig. 5, and fig. 6b is an axial chromatic aberration diagram of the lens in the embodiment shown in fig. 5. It can be seen that through reasonable focal power distribution and dispersion coefficient selection, the surface type of each lens is reasonably optimized, the vertical axis chromatic aberration of the lens can be reduced to be less than 1.9um, the axial chromatic aberration is reduced to be less than 16um, and the vertical axis chromatic aberration and the axial chromatic aberration of the lens can be effectively corrected.
In summary, the lens provided by the embodiment of the present application enables the lens to have a good imaging effect on monochromatic light of each wavelength within a wide band range of visible light by reasonably distributing the focal power of each lens and adopting the design of the double cemented lenses, so that the optical chromatic aberration of the lens is effectively corrected, and the imaging quality of the lens is improved.
Referring to fig. 7, an embodiment of the present application further provides a camera module 100, where the camera module 100 includes a housing 20, a photosensitive element 30, a substrate 40, and the lens 10 described in any of the foregoing embodiments, and in addition, in order to adapt to the current design direction of miniaturization and ultra-thinness of the mobile phone, the camera module 100 may adopt a periscopic module structure, and at this time, the camera module 100 may further include a light-converting prism 50. When the device is specifically arranged, the light conversion prism 50, the lens 10, the photosensitive element 30 and the substrate 40 are respectively arranged in the shell 20, the shell 20 is provided with a light inlet 21, and the light conversion prism 50 is arranged at the light inlet 21 and is used for converting light rays emitted from the light inlet 21 and emitting the light rays into the lens 10; the photosensitive element 30 is located on an imaging surface of the lens 10, and can be used for performing photoelectric conversion and a/D (analog/digital) conversion on an optical signal of an incident light; the substrate 40 is disposed on a side of the photosensitive element 30 away from the lens, and is used for bearing the photosensitive element 30, and transmitting the converted electrical signal to a graphic processor or a central processing unit of the electronic device through the substrate 40, so as to achieve functions of obtaining, converting, and processing an optical image. Since the optical chromatic aberration of the lens 10 can be effectively suppressed, the imaging quality of the camera module 100 can be improved.
Referring to fig. 8, an embodiment of the present application further provides an electronic device 200, where the electronic device 200 may be a common terminal in the prior art, such as a mobile phone, a tablet computer, or a notebook computer. The electronic device 200 includes a housing 210 and the camera module 100 in the above embodiments, the camera module 100 is disposed in the housing 210, and an opening 220 is formed in a position of the housing 210 corresponding to the light inlet of the camera module 100, so that light can enter the camera module 100 through the opening 220. The image captured by the electronic device 200 has high quality.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (14)

1. A lens barrel characterized by, from an object side to an image side, comprising in order:
a first lens having a positive refractive power;
a second lens having a negative focal power;
a third lens having a positive refractive power;
the fourth lens has negative focal power, and the fourth lens and the third lens form a double cemented lens which has positive focal power;
and a fifth lens having a negative power.
2. The lens barrel as claimed in claim 1, wherein the equivalent focal length of the lens barrel is not less than 90 mm.
3. The lens barrel according to claim 1, wherein a distance TTL from an object side surface of the first lens element to an image plane of the lens barrel and an effective focal length f of the lens barrel satisfy: TTL/f is more than or equal to 0.75 and less than or equal to 1.
4. The lens barrel as claimed in claim 1, wherein an effective focal length f of the cemented doublet34And the effective focal length f of the lens meets the following conditions: f is not less than 034/f≤1。
5. The lens barrel as recited in claim 1, wherein the temperature coefficient of refractive index (dn/dt) of at least one lens satisfies: -9X 10-5≤(dn/dt)≤9×10-5。
6. The lens barrel as claimed in claim 1, wherein the object side surface of the first lens is convex at a paraxial region thereof.
7. The lens barrel according to any one of claims 1 to 6, wherein the third lens element and the fourth lens element are made of glass.
8. The lens barrel as claimed in claim 7, wherein the third lens and the fourth lens are spherical lenses, respectively.
9. The lens barrel as claimed in any one of claims 1, wherein the first lens is an aspherical lens; and/or the second lens is an aspheric lens; and/or the fifth lens is an aspheric lens.
10. The lens barrel according to any one of claims 1 to 9, further comprising an aperture stop provided on an object side of the first lens.
11. The lens barrel according to any one of claims 1 to 9, further comprising a filter disposed on an image side of the fifth lens.
12. The lens barrel according to any one of claims 1 to 11, further comprising a vignetting diaphragm disposed on an object side of the first lens; or the lens further comprises a vignetting diaphragm arranged on the image side of the first lens.
13. A camera module, characterized in that, including a housing, a photosensitive element, a substrate and a lens as claimed in any one of claims 1 to 12, the photosensitive element, the substrate and the lens are disposed in the housing, the housing has a light inlet, the photosensitive element is disposed on an image plane of the lens, the substrate is disposed on a side of the photosensitive element away from the lens, and is used for bearing the photosensitive element and electrically connected to the photosensitive element.
14. An electronic device, comprising a housing and the camera module according to claim 13, wherein the camera module is disposed in the housing, and a hole is formed in the housing at a position corresponding to the light inlet of the camera module.
CN202010177146.9A 2020-03-13 2020-03-13 Lens, camera module and electronic equipment Active CN113391426B (en)

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PCT/CN2021/080507 WO2021180211A1 (en) 2020-03-13 2021-03-12 Camera lens, camera module, and electronic device

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US20180231741A1 (en) * 2016-07-14 2018-08-16 Zhejiang Sunny Optics Co., Ltd. Ocular lens

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CN100430771C (en) * 2003-11-04 2008-11-05 伊斯曼柯达公司 Objective lens system having three lenses
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Publication number Priority date Publication date Assignee Title
US4456345A (en) * 1979-12-25 1984-06-26 Canon Kabushiki Kaisha Thin type photographic lens system
US20040057124A1 (en) * 2002-08-05 2004-03-25 Kiichiro Nishina Lens for reading an original, method and apparatus for reading an original, and image forming apparatus
US20080239515A1 (en) * 2007-03-30 2008-10-02 Taro Asami Imaging lens and imaging apparatus
JP2008250331A (en) * 2008-04-28 2008-10-16 Ricoh Co Ltd Original reading lens, original reading method and device, and image forming apparatus
JP2013025202A (en) * 2011-07-22 2013-02-04 Konica Minolta Advanced Layers Inc Image pickup lens and image pickup apparatus
JP2014202986A (en) * 2013-04-08 2014-10-27 株式会社ニコン Teleconverter lens
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