CN105988200A - Imaging system, image capturing device and electronic device - Google Patents

Abstract

The invention discloses an imaging system, an image capturing device and an electronic device. The imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof. The second lens element with negative refractive power has a concave image-side surface at a paraxial region. The third lens element with refractive power. The fourth lens element with refractive power has an image-side surface being concave at a paraxial region thereof and including at least one convex at an off-axis region thereof, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with refractive power has an object-side surface being convex at a paraxial region thereof, and an image-side surface being concave at a paraxial region thereof and including at least one convex surface at an off-axis region thereof, wherein the object-side surface and the image-side surface thereof are aspheric. When specific conditions are met, the generation of collision between lenses during assembly can be effectively avoided. The invention also discloses an image capturing device with the imaging system and an electronic device with the image capturing device.

Description

Imaging system, imaging device and electronic device

technical field

The invention relates to an imaging system and an image capturing device, and in particular to a miniaturized imaging system and an image capturing device applied to an electronic device.

Background technique

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive element of a general optical system is nothing more than a photosensitive coupling device (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The pixel size of components is shrinking, and the optical system is gradually developing into the high-pixel field, so the requirements for imaging quality are also increasing.

Traditional optical systems mounted on electronic devices mostly use four-piece lens structures. The configuration of the lens shape often leads to a decrease in the relative illuminance around the short total length of the optical system, and the problem of poor lens formation, so that the known optical system It will not be able to meet the needs of higher-level photography.

At present, although there is further development of the general traditional five-element optical system, the thickness of the lens changes too much, resulting in poor molding, and the sensitivity is too high due to the strong refractive power of the lens, so that the light angle changes too much and causes surface reflection. And other issues.

Contents of the invention

The object of the present invention is to provide an imaging system, an imaging device, and an electronic device, which averagely configure the thicknesses of the fourth lens and the fifth lens from the near axis to the off axis, so as to improve the poor molding caused by excessive changes in lens thickness problems, and is beneficial to the configuration of the third lens, the fourth lens and the fifth lens, and reduces the possibility of collision between lenses during assembly. Furthermore, the present invention can ensure that the third lens has a smaller refractive power at the paraxial position, solves the problem of over-correction of the image center, and helps to achieve a balance between achromatism and higher-order aberrations.

According to the present invention, an imaging system is provided, which sequentially includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side. The first lens has positive refractive power, and its object-side surface is convex near the axis. The second lens has negative refractive power, and its image-side surface is concave near the axis. The third lens has refractive power. The fourth lens has refractive power, and its image-side surface is concave near the axis and at least one convex off-axis, and its object-side surface and image-side surface are both aspherical. The fifth lens has refractive power, the object side surface is convex near the axis, the image side surface is concave near the axis and the off axis includes at least one convex surface, and both the object side surface and the image side surface are aspheric. There are five lenses with refractive power in the imaging system, there is an air gap between any two adjacent lenses with refractive power, the thickness of the fourth lens on the optical axis is CT4, the third lens and the fourth lens are on the optical axis The separation distance between the fourth lens and the fifth lens on the optical axis is T45, the focal length of the imaging system is f, the curvature radius of the object-side surface of the third lens is R5, and the curvature of the image-side surface of the third lens is The radius is R6, the dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the fourth lens is V4, which satisfy the following conditions:

CT4/T34<1.20;

CT4/T45<1.60;

|f/R5|+|f/R6|<1.10; and

1.75<(V2+V4)/V3.

According to the present invention, there is also provided an imaging device, comprising the imaging system as mentioned in the preceding paragraph and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the imaging system.

According to the present invention, there is further provided an electronic device, including the imaging device as mentioned in the preceding paragraph.

When CT4/T34 satisfies the above conditions, it is beneficial to the arrangement of the third lens and the fourth lens, so as to reduce the possibility of collision between lenses during assembly.

When CT4/T45 satisfies the above conditions, it is beneficial to the arrangement of the fourth lens and the fifth lens, so as to reduce the possibility of collision between lenses during assembly.

When |f/R5|+|f/R6| satisfies the above conditions, it can ensure that the third lens has a small refractive power at the paraxial position, so as to solve the problem of over-correction of the image center.

When (V2+V4)/V3 satisfies the above conditions, it helps to strike a balance between achromatic and higher-order aberrations.

Description of drawings

FIG. 1 shows a schematic diagram of an imaging device according to a first embodiment of the present invention;

Figure 2 is the spherical aberration, astigmatism and distortion curves of the first embodiment in order from left to right;

3 shows a schematic diagram of an imaging device according to a second embodiment of the present invention;

Fig. 4 is the spherical aberration, astigmatism and distortion curves of the second embodiment in order from left to right;

5 shows a schematic diagram of an imaging device according to a third embodiment of the present invention;

Fig. 6 is the spherical aberration, astigmatism and distortion curves of the third embodiment in sequence from left to right;

7 is a schematic diagram of an imaging device according to a fourth embodiment of the present invention;

Fig. 8 is the spherical aberration, astigmatism and distortion curves of the fourth embodiment in order from left to right;

9 is a schematic diagram of an imaging device according to a fifth embodiment of the present invention;

Fig. 10 is the spherical aberration, astigmatism and distortion curves of the fifth embodiment in sequence from left to right;

11 is a schematic diagram of an imaging device according to a sixth embodiment of the present invention;

Figure 12 is the spherical aberration, astigmatism and distortion curves of the sixth embodiment in sequence from left to right;

13 is a schematic diagram of an imaging device according to a seventh embodiment of the present invention;

Figure 14 is the spherical aberration, astigmatism and distortion curves of the seventh embodiment in order from left to right;

15 is a schematic diagram of an imaging device according to an eighth embodiment of the present invention;

Fig. 16 is the spherical aberration, astigmatism and distortion curves of the eighth embodiment in order from left to right;

17 is a schematic diagram of an imaging device according to a ninth embodiment of the present invention;

Fig. 18 is the spherical aberration, astigmatism and distortion curves of the ninth embodiment in order from left to right;

19 is a schematic diagram of an imaging device according to a tenth embodiment of the present invention;

Fig. 20 is the spherical aberration, astigmatism and distortion curves of the tenth embodiment in order from left to right;

FIG. 21 is a schematic diagram of an electronic device according to an eleventh embodiment of the present invention;

FIG. 22 is a schematic diagram of an electronic device according to a twelfth embodiment of the present invention; and

FIG. 23 is a schematic diagram of an electronic device according to a thirteenth embodiment of the present invention.

【Symbol Description】

Electronics: 10, 20, 30

Image taking device: 11, 21, 31

Aperture: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000

First lens: 110, 210, 310, 410, 510, 610, 710, 810, 910, 1010

Object side surface: 111, 211, 311, 411, 511, 611, 711, 811, 911, 1011

Image side surface: 112, 212, 312, 412, 512, 612, 712, 812, 912, 1012

Second lens: 120, 220, 320, 420, 520, 620, 720, 820, 920, 1020

Object side surface: 121, 221, 321, 421, 521, 621, 721, 821, 921, 1021

Image side surface: 122, 222, 322, 422, 522, 622, 722, 822, 922, 1022

Third lens: 130, 230, 330, 430, 530, 630, 730, 830, 930, 1030

Object side surface: 131, 231, 331, 431, 531, 631, 731, 831, 931, 1031

Image side surface: 132, 232, 332, 432, 532, 632, 732, 832, 932, 1032

Fourth lens: 140, 240, 340, 440, 540, 640, 740, 840, 940, 1040

Object side surface: 141, 241, 341, 441, 541, 641, 741, 841, 941, 1041

Image side surface: 142, 242, 342, 442, 542, 642, 742, 842, 942, 1042

Fifth lens: 150, 250, 350, 450, 550, 650, 750, 850, 950, 1050

Object side surface: 151, 251, 351, 451, 551, 651, 751, 851, 951, 1051

Image side surface: 152, 252, 352, 452, 552, 652, 752, 852, 952, 1052

Infrared filter elements: 160, 260, 360, 460, 560, 660, 760, 860, 960, 1060

Imaging surface: 170, 270, 370, 470, 570, 670, 770, 870, 970, 1070

Electronic photosensitive element: 180, 280, 380, 480, 580, 680, 780, 880, 980, 1080

f: focal length of the imaging system

Fno: the aperture value of the imaging system

HFOV: Half of the maximum field of view of the imaging system

V2: Dispersion coefficient of the second lens

V3: Dispersion coefficient of the third lens

V4: Dispersion coefficient of the fourth lens

CT1: the thickness of the first lens on the optical axis

CT2: The thickness of the second lens on the optical axis

CT3: The thickness of the third lens on the optical axis

CT4: The thickness of the fourth lens on the optical axis

CT5: The thickness of the fifth lens on the optical axis

T12: the distance between the first lens and the second lens on the optical axis

T23: the distance between the second lens and the third lens on the optical axis

T34: the distance between the third lens and the fourth lens on the optical axis

T45: the distance between the fourth lens and the fifth lens on the optical axis

ΣAT: the sum of the distances between the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis between two adjacent lenses

TL: the distance from the object-side surface of the first lens to the imaging plane on the optical axis

R5: Radius of curvature of the object-side surface of the third lens

R6: Radius of curvature of the image-side surface of the third lens

R7: Radius of curvature of the object-side surface of the fourth lens

R8: Radius of curvature of the image-side surface of the fourth lens

R9: radius of curvature of the object-side surface of the fifth lens

R10: Radius of curvature of the image-side surface of the fifth lens

f1: focal length of the first lens

f2: focal length of the second lens

f3: focal length of the third lens

f4: focal length of the fourth lens

f5: focal length of the fifth lens

detailed description

According to the present invention, an imaging system is provided, which sequentially includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side, wherein the imaging system has five lenses with refractive power.

In the first lens, the second lens, the third lens, the fourth lens and the fifth lens of the imaging system mentioned in the previous paragraph, there is an air gap between any two adjacent lenses with refractive power; that is to say, the imaging system has five A single uncemented lens. Because the manufacturing process of cemented lenses is more complicated than that of non-cemented lenses, especially the bonding surface of the two lenses must have a high-precision curved surface in order to achieve high adhesion when the two lenses are bonded, and during the bonding process, it is also possible Poor adhesion due to misalignment affects the overall optical imaging quality. Therefore, in the imaging system of the present invention, there is an air gap between any two adjacent lenses with refractive power, which can effectively solve the problems caused by cemented lenses.

The first lens has positive refractive power, its object-side surface is convex near the axis, and its image-side surface is concave near the axis. Thereby, the strength of the positive refractive power of the first lens can be properly adjusted, which helps to shorten the total length of the imaging system.

The second lens has negative refractive power, and its image-side surface is concave near the axis. Thereby, the aberration of the imaging system can be effectively corrected.

The third lens may have positive refractive power. Thereby, the sensitivity of the imaging system can be reduced.

The object-side surface of the fourth lens can be convex near the axis, the image-side surface of the fourth lens can be concave near the axis, and include at least one convex off-axis. Thereby, it is beneficial to average the thickness of the fourth lens from the near-axis to the off-axis, so as to improve the problem of bad molding caused by excessive variation of lens thickness.

The object-side surface of the fifth lens is convex near the axis, the image-side surface of the fifth lens is concave near the axis and includes at least one convex off-axis. Thereby, it is beneficial to average the thickness of the fifth lens from the near-axis to the off-axis, so as to improve the problem of bad molding caused by excessive variation of lens thickness.

The thickness of the fourth lens on the optical axis is CT4, and the distance between the third lens and the fourth lens on the optical axis is T34, which satisfies the following condition: CT4/T34<1.20. Thereby, the arrangement of the third lens and the fourth lens is beneficial to reduce the possibility of collision between lenses during assembly. Preferably, the following condition can be satisfied: CT4/T34<1.0.

The thickness of the fourth lens on the optical axis is CT4, and the distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following condition: CT4/T45<1.60. Thereby, the arrangement of the fourth lens and the fifth lens is beneficial to reduce the possibility of collision between lenses during assembly. Preferably, the following condition can be met: CT4/T45<1.48. More preferably, the following condition can be satisfied: CT4/T45<1.25.

The focal length of the imaging system is f, the radius of curvature of the object-side surface of the third lens is R5, and the curvature radius of the image-side surface of the third lens is R6, which satisfy the following conditions: |f/R5|+|f/R6|<1.10. In this way, the third lens can be ensured to have a smaller refractive power at the paraxial position, so as to solve the problem of over-correction of the image center. Preferably, the following condition can be satisfied: |f/R5|+|f/R6|<0.75.

The dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the fourth lens is V4, which satisfy the following condition: 1.75<(V2+V4)/V3. This helps strike a balance between achromatism and higher-order aberrations.

The dispersion coefficient of the third lens is V3, which satisfies the following condition: V3<30. Thereby, it is helpful to correct the chromatic aberration of the imaging system.

The radius of curvature of the object-side surface of the fourth lens is R7, and the focal length of the imaging system is f, which satisfies the following condition: |R7/f|<3.0. Thereby, the aberration of the imaging system can be corrected and the imaging quality can be improved. Preferably, the following condition can be satisfied: |R7/f|<2.3.

The aperture value of the imaging system is Fno, which satisfies the following condition: 1.6<Fno<2.4. In this way, the advantages of the large aperture can be effectively utilized, and images can still be clearly captured when the light is not sufficient.

The distance on the optical axis from the object-side surface of the first lens to the imaging plane is TL, which satisfies the following condition: TL<6mm. Thereby, the overall length of the imaging system can be shortened, contributing to its miniaturization.

Half of the maximum viewing angle of the imaging system is HFOV, which satisfies the following condition: 35 degrees<HFOV. Thereby, an appropriate viewing angle and a larger image range can be obtained.

The focal length of the imaging system is f, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, which satisfy the following conditions: |f/f3|+|f/f4|+|f /f5|<0.60. In this way, it can avoid problems such as surface reflection caused by too strong refractive power of the lens and excessive sensitivity caused by too large changes in the angle of light

The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, which satisfy the following conditions: |f3|>| f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|. Thereby, the refractive force of the imaging system can be effectively regulated, so that the configuration of the imaging system's refractive power can be balanced, so as to reduce its sensitivity.

The radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface of the fourth lens is R8, the curvature radius of the object side surface of the fifth lens is R9, and the curvature radius of the image side surface of the fifth lens is R10, the imaging system The focal length of is f, which satisfies the following condition: (|R7|+|R8|+|R9|+|R10|)/f<3.5. Thereby, the shapes of the fourth lens and the fifth lens can be properly configured, which helps to improve the problem of poor lens formation.

The distance between the first lens and the second lens on the optical axis is T12, the distance between the second lens and the third lens on the optical axis is T23, and the distance between the third lens and the fourth lens on the optical axis is T34 , the distance between the fourth lens and the fifth lens on the optical axis is T45, and the distance between two adjacent lenses in the first lens, the second lens, the third lens, the fourth lens and the fifth lens is on the optical axis The sum of is ΣAT (ΣAT=T12+T23+T34+T45), which satisfies the following condition: 0.60<(T34+T45)/ΣAT<0.80. Thereby, the assembly of the lens is facilitated to improve the production yield.

The dispersion coefficient of the second lens is V2, the dispersion coefficient of the third lens is V3, and the dispersion coefficient of the fourth lens is V4, which satisfy the following condition: V2+V3+V4<90. Thereby, it is helpful to correct the chromatic aberration of the imaging system.

The thickness of the first lens on the optical axis is CT1, the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the fifth The thickness of the lens on the optical axis is CT5, and the largest among CT1, CT2, CT3, CT4 and CT5 is CT5. Thereby, the formability and homogeneity of the lens are improved, so as to improve the manufacturing yield.

The thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, which satisfies The following condition: (CT2+CT3+CT4)/CT5<1.25. This contributes to the moldability and homogeneity of the lens.

The radius of curvature of the image-side surface of the fourth lens is R8, and the curvature radius of the object-side surface of the fifth lens is R9, which satisfy the following condition: 1.20<R8/R9. Thereby, aberrations can be effectively corrected.

In the imaging system provided by the present invention, the material of the lens can be plastic or glass. When the material of the lens is plastic, the production cost can be effectively reduced. In addition, when the material of the lens is glass, the degree of freedom in configuring the refractive power of the imaging system can be increased. In addition, the object-side surface and the image-side surface in the imaging system can be aspherical (ASP), and the aspheric surface can be easily made into a shape other than spherical, so as to obtain more control variables to reduce aberrations, thereby reducing the lens usage. number, so the overall length of the imaging system of the present invention can be effectively reduced.

Furthermore, in the imaging system provided by the present invention, if the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at the paraxial position; if the lens surface is concave and the concave position is not defined, then Indicates that the lens surface is concave at the paraxial. In the imaging system provided by the present invention, if the lens has positive refractive power or negative refractive power, or the focal length of the lens, it refers to the refractive power or focal length of the lens near the axis.

In the imaging system of the present invention, the image surface (Image Surface) can be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing the object side, depending on the corresponding electronic photosensitive element.

In the imaging system of the present invention, an aperture may be included, and the aperture configuration may be a front aperture or a middle aperture, wherein the front aperture means that the aperture is set between the subject and the first lens, and the middle aperture means that the aperture is set between the first lens and the imaging plane. If the aperture is a front aperture, it can make the exit pupil of the imaging system (ExitPupil) and the imaging surface have a longer distance, so that it has a telecentric (Telecentric) effect, and can increase the efficiency of the CCD or CMOS of the electronic photosensitive element to receive images ; If it is a central aperture, it will help to expand the field of view of the system, so that the imaging system has the advantage of a wide-angle lens.

In addition, in the imaging system of the present invention, at least one aperture can be set according to requirements to reduce stray light and help improve image quality.

The imaging system of the present invention can be applied to the optical system of moving focusing according to the requirements, and has the characteristics of excellent aberration correction and good imaging quality. It can also be used in various electronic devices such as 3D (three-dimensional) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, somatosensory game consoles, driving recorders, reversing developing devices, and wearable devices. .

The present invention further provides an image capturing device, comprising the aforementioned imaging system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging system. In the imaging system, by averaging the thickness of the fourth lens and the fifth lens from the near axis to the off axis, the problem of poor molding caused by excessive lens thickness variation is improved, and it is beneficial to the third lens, the fourth lens and the third lens. The five-lens configuration reduces the possibility of collision between lenses during assembly. Furthermore, the present invention can solve the problem of over-correction at the center of the image, and help to strike a balance between achromatism and higher-order aberrations. Preferably, the imaging device may further include a barrel (Barrel Member), a support device (Holder Member) or a combination thereof.

The present invention provides an electronic device, including the aforementioned image capturing device. In this way, while taking advantage of the advantages of molding and assembly, it has an appropriate refraction force, so as to meet the peripheral relative illuminance requirements of the short total length imaging system. Preferably, the electronic device may further include a control unit (Control Unit), a display unit (Display), a storage unit (Storage Unit), a random access memory (RAM) or a combination thereof.

According to the above implementation manners, specific embodiments are proposed below and described in detail with reference to the accompanying drawings.

<First embodiment>

Please refer to FIG. 1 and FIG. 2, wherein FIG. 1 shows a schematic diagram of an imaging device according to the first embodiment of the present invention, and FIG. 2 shows the spherical aberration, astigmatism and distortion of the first embodiment in order from left to right Graph. As can be seen from FIG. 1 , the imaging device of the first embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 180 . The imaging system includes an aperture 100, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, an infrared filter element 160, and an imaging surface 170 in order from the object side to the image side. , and the electronic photosensitive element 180 is arranged on the imaging surface 170 of the imaging system, wherein there are five lenses (110-150) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 110 has positive refractive power and is made of plastic material. The object-side surface 111 is convex near the axis, and the image-side surface 112 is concave near the axis. Both are aspherical.

The second lens 120 has negative refractive power and is made of plastic material. The object-side surface 121 is convex near the axis, and the image-side surface 122 is concave near the axis. Both are aspherical.

The third lens 130 has negative refractive power and is made of plastic material. The object-side surface 131 is concave near the axis, and the image-side surface 132 is convex near the axis. Both are aspherical.

The fourth lens 140 has positive refractive power and is made of plastic material. The object-side surface 141 is convex near the axis, and the image-side surface 142 is concave near the axis. Both are aspherical. In addition, the image-side surface 142 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 150 has negative refractive power and is made of plastic material. The object-side surface 151 is convex near the axis, and the image-side surface 152 is concave near the axis. Both are aspherical. In addition, the image-side surface 152 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 160 is made of glass, and is disposed between the fifth lens 150 and the imaging surface 170 without affecting the focal length of the imaging system.

The curve equations of the aspheric surfaces of the above-mentioned lenses are expressed as follows:

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; sqrt</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Ai</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}^{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ;</span>$

in:

X: The point on the aspheric surface whose distance from the optical axis is Y, and its relative distance from the intersection point tangent to the aspheric optical axis;

Y: The vertical distance between the point on the aspheric curve and the optical axis;

R: radius of curvature;

k: cone coefficient; and

Ai: i-th order aspherical coefficient.

In the imaging system of the first embodiment, the focal length of the imaging system is f, the aperture value (f-number) of the imaging system is Fno, and half of the maximum viewing angle in the imaging system is HFOV, and its numerical value is as follows: f=4.26mm; Fno= 2.12; and HFOV = 36.7 degrees.

In the imaging system of the first embodiment, the dispersion coefficient of the second lens 120 is V2, the dispersion coefficient of the third lens 130 is V3, and the dispersion coefficient of the fourth lens 140 is V4, which satisfy the following conditions: V2+V3+V4= 77.2; (V2+V4)/V3=2.02; and V3=25.6.

In the imaging system of the first embodiment, the thickness of the second lens 120 on the optical axis is CT2, the thickness of the third lens 130 on the optical axis is CT3, the thickness of the fourth lens 140 on the optical axis is CT4, and the thickness of the fifth lens 140 on the optical axis is CT4. The thickness of the lens 150 on the optical axis is CT5, which satisfies the following condition: (CT2+CT3+CT4)/CT5=1.19.

In the imaging system of the first embodiment, the distance between the first lens 110 and the second lens 120 on the optical axis is T12, the distance between the second lens 120 and the third lens 130 on the optical axis is T23, and the distance between the third lens 120 and the third lens 130 is T23. The distance between 130 and the fourth lens 140 on the optical axis is T34, the distance between the fourth lens 140 and the fifth lens 150 on the optical axis is T45, the first lens 110, the second lens 120, the third lens 130, The sum of the distances between two adjacent lenses on the optical axis in the fourth lens 140 and the fifth lens 150 is ΣAT (ΣAT=T12+T23+T34+T45), which satisfies the following conditions: (T34+T45)/ΣAT = 0.67.

In the imaging system of the first embodiment, the thickness of the fourth lens 140 on the optical axis is CT4, and the distance between the third lens 130 and the fourth lens 140 on the optical axis is T34, which satisfies the following conditions: CT4/T34= 0.75.

In the imaging system of the first embodiment, the thickness of the fourth lens 140 on the optical axis is CT4, and the distance between the fourth lens 140 and the fifth lens 150 on the optical axis is T45, which satisfies the following conditions: CT4/T45= 0.85.

In the imaging system of the first embodiment, the distance on the optical axis from the object-side surface 111 of the first lens to the imaging surface 170 is TL, which satisfies the following condition: TL=4.79 mm.

In the imaging system of the first embodiment, the focal length of the imaging system is f, the radius of curvature of the third lens object side surface 131 is R5, and the curvature radius of the third lens image side surface 132 is R6, which satisfies the following conditions: |f/ R5|+|f/R6|=0.30.

In the imaging system of the first embodiment, the radius of curvature of the object-side surface 141 of the fourth lens is R7, and the focal length of the imaging system is f, which satisfies the following condition: |R7/f|=0.87.

In the imaging system of the first embodiment, the radius of curvature of the fourth lens object side surface 141 is R7, the curvature radius of the fourth lens image side surface 142 is R8, the curvature radius of the fifth lens object side surface 151 is R9, and the fifth lens object side surface 151 has a curvature radius of R9. The radius of curvature of the image-side surface 152 of the lens is R10, and the focal length of the imaging system is f, which satisfies the following condition: (|R7|+|R8|+|R9|+|R10|)/f=2.81.

In the imaging system of the first embodiment, the radius of curvature of the image-side surface 142 of the fourth lens is R8, and the radius of curvature of the object-side surface 151 of the fifth lens is R9, which satisfies the following conditions: R8/R9=1.39

In the imaging system of the first embodiment, the focal length of the imaging system is f, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, and the focal length of the fifth lens 150 is f5, which satisfy the following conditions: |f /f3|+|f/f4|+|f/f5|=0.37.

In addition, in the imaging system of the first embodiment, the thickness of the first lens 110 on the optical axis is CT1, the thickness of the second lens 120 on the optical axis is CT2, and the thickness of the third lens 130 on the optical axis is CT3. The thickness of the fourth lens 140 on the optical axis is CT4, the thickness of the fifth lens 150 on the optical axis is CT5, and the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 1 and Table 2 below.

Table 1 shows the detailed structural data of the first embodiment in FIG. 1 , where the units of the radius of curvature, thickness and focal length are mm, and surfaces 0-14 represent surfaces from the object side to the image side in sequence. Table 2 shows the aspheric surface data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A4-A16 represent the 4th-16th order aspheric coefficients of each surface. In addition, the tables of the following embodiments are schematic diagrams and aberration curve diagrams corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

<Second Embodiment>

Please refer to FIG. 3 and FIG. 4, wherein FIG. 3 shows a schematic diagram of an imaging device according to the second embodiment of the present invention, and FIG. 4 shows the spherical aberration, astigmatism and distortion of the second embodiment in sequence from left to right Graph. As can be seen from FIG. 3 , the imaging device of the second embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 280 . The imaging system includes an aperture 200, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, an infrared filter element 260, and an imaging surface 270 in order from the object side to the image side. , and the electronic photosensitive element 280 is arranged on the imaging surface 270 of the imaging system, wherein there are five lenses (210-250) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 210 has positive refractive power and is made of plastic material. The object-side surface 211 is convex near the axis, and the image-side surface 212 is concave near the axis. Both are aspherical.

The second lens 220 has negative refractive power and is made of plastic material. The object-side surface 221 is convex near the axis, and the image-side surface 222 is concave near the axis. Both are aspherical.

The third lens 230 has negative refractive power and is made of plastic material. The object-side surface 231 is concave near the axis, and the image-side surface 232 is concave near the axis. Both are aspherical.

The fourth lens 240 has positive refractive power and is made of plastic material. The object-side surface 241 is convex near the axis, and the image-side surface 242 is concave near the axis. Both are aspherical. In addition, the image-side surface 242 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 250 has negative refractive power and is made of plastic material. The object-side surface 251 is convex near the axis, and the image-side surface 252 is concave near the axis. Both are aspherical. In addition, the image-side surface 252 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 260 is made of glass, which is disposed between the fifth lens 250 and the imaging surface 270 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the second embodiment, the thickness of the first lens 210 on the optical axis is CT1, the thickness of the second lens 220 on the optical axis is CT2, and the thickness of the third lens 230 on the optical axis is CT3. The thickness of the fourth lens 240 on the optical axis is CT4, the thickness of the fifth lens 250 on the optical axis is CT5, and the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 3 and Table 4 below.

In the second embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 3 and Table 4, the following data can be deduced:

<Third embodiment>

Please refer to FIG. 5 and FIG. 6, wherein FIG. 5 shows a schematic diagram of an imaging device according to the third embodiment of the present invention, and FIG. 6 shows the spherical aberration, astigmatism and distortion of the third embodiment in sequence from left to right Graph. As can be seen from FIG. 5 , the imaging device of the third embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 380 . The imaging system includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, an infrared filter element 360, and an imaging surface 370 in order from the object side to the image side. , and the electronic photosensitive element 380 is arranged on the imaging surface 370 of the imaging system, wherein there are five lenses (310-350) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 310 has a positive refractive power and is made of plastic material. The object-side surface 311 is convex near the axis, and the image-side surface 312 is convex near the axis. Both are aspherical.

The second lens 320 has negative refractive power and is made of plastic material. The object-side surface 321 is convex near the axis, and the image-side surface 322 is concave near the axis. Both are aspherical.

The third lens 330 has positive refractive power and is made of plastic material. The object-side surface 331 is convex near the axis, and the image-side surface 332 is convex near the axis. Both are aspherical.

The fourth lens 340 has positive refractive power and is made of plastic material. The object-side surface 341 is convex near the axis, and the image-side surface 342 is concave near the axis. Both are aspherical. In addition, the image-side surface 342 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 350 has negative refractive power and is made of plastic material. The object-side surface 351 is convex near the axis, and the image-side surface 352 is concave near the axis. Both are aspherical. In addition, the image-side surface 352 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 360 is made of glass, which is disposed between the fifth lens 350 and the imaging surface 370 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the third embodiment, the focal length of the first lens 310 is f1, the focal length of the second lens 320 is f2, the focal length of the third lens 330 is f3, the focal length of the fourth lens 340 is f4, and the focal length of the fifth lens The focal length of 350 is f5, which satisfies the following conditions: |f3|>|f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|.

Then refer to Table 5 and Table 6 below.

In the third embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 5 and Table 6, the following data can be deduced:

<Fourth Embodiment>

Please refer to FIG. 7 and FIG. 8, wherein FIG. 7 shows a schematic diagram of an imaging device according to the fourth embodiment of the present invention, and FIG. 8 shows the spherical aberration, astigmatism and distortion of the fourth embodiment in sequence from left to right Graph. As can be seen from FIG. 7 , the imaging device of the fourth embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 480 . The imaging system includes an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, an infrared filter element 460, and an imaging surface 470 in order from the object side to the image side. , and the electronic photosensitive element 480 is arranged on the imaging surface 470 of the imaging system, wherein there are five lenses (410-450) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 410 has positive refractive power and is made of plastic material. The object-side surface 411 is convex near the axis, and the image-side surface 412 is concave near the axis. Both are aspherical.

The second lens 420 has a negative refractive power and is made of plastic material. The object-side surface 421 is convex near the axis, and the image-side surface 422 is concave near the axis. Both are aspherical.

The third lens 430 has a positive refractive power and is made of plastic material. The object-side surface 431 is concave near the axis, and the image-side surface 432 is convex near the axis. Both are aspherical.

The fourth lens 440 has negative refractive power and is made of plastic material. The object-side surface 441 is convex near the axis, and the image-side surface 442 is concave near the axis. Both are aspherical. In addition, the image-side surface 442 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 450 has negative refractive power and is made of plastic material. The object-side surface 451 is convex near the axis, and the image-side surface 452 is concave near the axis. Both of them are aspherical. In addition, the image-side surface 452 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 460 is made of glass, which is disposed between the fifth lens 450 and the imaging surface 470 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the fourth embodiment, the focal length of the first lens 410 is f1, the focal length of the second lens 420 is f2, the focal length of the third lens 430 is f3, the focal length of the fourth lens 440 is f4, and the focal length of the fifth lens The focal length of 450 is f5, which satisfies the following conditions: |f3|>|f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|.

In the imaging system of the fourth embodiment, the thickness of the first lens 410 on the optical axis is CT1, the thickness of the second lens 420 on the optical axis is CT2, the thickness of the third lens 430 on the optical axis is CT3, and the thickness of the fourth lens 430 on the optical axis is CT3. The thickness of the lens 440 on the optical axis is CT4, the thickness of the fifth lens 450 on the optical axis is CT5, and the largest among CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 7 and Table 8 below.

In the fourth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 7 and Table 8, the following data can be deduced:

<Fifth Embodiment>

Please refer to FIG. 9 and FIG. 10, wherein FIG. 9 shows a schematic diagram of an imaging device according to a fifth embodiment of the present invention, and FIG. 10 shows the spherical aberration, astigmatism and distortion of the fifth embodiment in sequence from left to right Graph. As can be seen from FIG. 9 , the imaging device of the fifth embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 580 . The imaging system includes an aperture 500, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, an infrared filter element 560, and an imaging surface 570 in order from the object side to the image side. , and the electronic photosensitive element 580 is disposed on the imaging surface 570 of the imaging system, wherein there are five lenses (510-550) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 510 has positive refractive power and is made of plastic material. The object-side surface 511 is convex near the axis, and the image-side surface 512 is concave near the axis. Both are aspherical.

The second lens 520 has negative refractive power and is made of plastic material. The object-side surface 521 is convex near the axis, and the image-side surface 522 is concave near the axis. Both are aspherical.

The third lens 530 has negative refractive power and is made of plastic material. The object-side surface 531 is concave near the axis, and the image-side surface 532 is convex near the axis. Both are aspherical.

The fourth lens 540 has a negative refractive power and is made of plastic material. The object-side surface 541 is convex near the axis, and the image-side surface 542 is concave near the axis. Both are aspherical. In addition, the image-side surface 542 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 550 has negative refractive power and is made of plastic material. The object-side surface 551 is convex near the axis, and the image-side surface 552 is concave near the axis. Both are aspherical. In addition, the image-side surface 552 of the fifth lens includes at least one convex surface off-axis.

The infrared filter element 560 is made of glass, which is disposed between the fifth lens 550 and the imaging surface 570 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the fifth embodiment, the focal length of the first lens 510 is f1, the focal length of the second lens 520 is f2, the focal length of the third lens 530 is f3, the focal length of the fourth lens 540 is f4, and the focal length of the fifth lens The focal length of the 550 is f5, which satisfies the following conditions: |f3|>|f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|.

In the imaging system of the fifth embodiment, the thickness of the first lens 510 on the optical axis is CT1, the thickness of the second lens 520 on the optical axis is CT2, the thickness of the third lens 530 on the optical axis is CT3, and the thickness of the fourth lens 530 on the optical axis is CT3. The thickness of the lens 540 on the optical axis is CT4, the thickness of the fifth lens 550 on the optical axis is CT5, and the largest among CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 9 and Table 10 below.

In the fifth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 9 and Table 10, the following data can be deduced:

<Sixth Embodiment>

Please refer to Figure 11 and Figure 12, wherein Figure 11 shows a schematic diagram of an imaging device according to the sixth embodiment of the present invention, and Figure 12 shows the spherical aberration, astigmatism and distortion of the sixth embodiment in sequence from left to right Graph. As can be seen from FIG. 11 , the imaging device of the sixth embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 680 . The imaging system includes an aperture 600, a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, an infrared filter element 660, and an imaging surface 670 in order from the object side to the image side. , and the electronic photosensitive element 680 is disposed on the imaging surface 670 of the imaging system, wherein there are five lenses (610-650) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 610 has a positive refractive power and is made of plastic material. The object-side surface 611 is convex near the axis, and the image-side surface 612 is concave near the axis. Both are aspherical.

The second lens 620 has negative refractive power and is made of plastic material. The object-side surface 621 is concave near the axis, and the image-side surface 622 is concave near the axis, both of which are aspherical.

The third lens 630 has negative refractive power and is made of plastic material. The object-side surface 631 is concave near the axis, and the image-side surface 632 is convex near the axis. Both are aspherical.

The fourth lens 640 has negative refractive power and is made of plastic material. The object-side surface 641 is convex near the axis, and the image-side surface 642 is concave near the axis. Both are aspherical. In addition, the image-side surface 642 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 650 has positive refractive power and is made of plastic material. The object-side surface 651 is convex near the axis, and the image-side surface 652 is concave near the axis. Both are aspherical. In addition, the image-side surface 652 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 660 is made of glass, which is disposed between the fifth lens 650 and the imaging surface 670 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the sixth embodiment, the focal length of the first lens 610 is f1, the focal length of the second lens 620 is f2, the focal length of the third lens 630 is f3, the focal length of the fourth lens 640 is f4, and the focal length of the fifth lens The focal length of 650 is f5, which satisfies the following conditions: |f3|>|f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|.

In the imaging system of the sixth embodiment, the thickness of the first lens 610 on the optical axis is CT1, the thickness of the second lens 620 on the optical axis is CT2, the thickness of the third lens 630 on the optical axis is CT3, and the thickness of the fourth lens 630 on the optical axis is CT3. The thickness of the lens 640 on the optical axis is CT4, the thickness of the fifth lens 650 on the optical axis is CT5, and the largest among CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 11 and Table 12 below.

In the sixth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 11 and Table 12, the following data can be calculated:

<Seventh Embodiment>

Please refer to FIG. 13 and FIG. 14, wherein FIG. 13 shows a schematic diagram of an imaging device according to the seventh embodiment of the present invention, and FIG. 14 shows the spherical aberration, astigmatism and distortion of the seventh embodiment in sequence from left to right Graph. As can be seen from FIG. 13 , the imaging device of the seventh embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 780 . The imaging system sequentially includes a first lens 710, an aperture 700, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, an infrared filter element 760, and an imaging surface 770 from the object side to the image side. , and the electronic photosensitive element 780 is arranged on the imaging surface 770 of the imaging system, wherein there are five lenses (710-750) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 710 has positive refractive power and is made of plastic material. The object-side surface 711 is convex near the axis, and the image-side surface 712 is convex near the axis, both of which are aspherical.

The second lens 720 has negative refractive power and is made of plastic material. The object-side surface 721 is concave near the axis, and the image-side surface 722 is concave near the axis. Both are aspherical.

The third lens 730 has positive refractive power and is made of plastic material. The object-side surface 731 is convex near the axis, and the image-side surface 732 is convex near the axis. Both are aspherical.

The fourth lens 740 has negative refractive power and is made of plastic material. The object-side surface 741 is convex near the axis, and the image-side surface 742 is concave near the axis. Both are aspherical. In addition, the image-side surface 742 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 750 has positive refractive power and is made of plastic material. The object-side surface 751 is convex near the axis, and the image-side surface 752 is concave near the axis. Both are aspherical. In addition, the image-side surface 752 of the fifth lens includes at least one convex surface off-axis.

The infrared filter element 760 is made of glass, which is disposed between the fifth lens 750 and the imaging surface 770 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the seventh embodiment, the thickness of the first lens 710 on the optical axis is CT1, the thickness of the second lens 720 on the optical axis is CT2, and the thickness of the third lens 730 on the optical axis is CT3. The thickness of the fourth lens 740 on the optical axis is CT4, the thickness of the fifth lens 750 on the optical axis is CT5, and the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 13 and Table 14 below.

In the seventh embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 13 and Table 14, the following data can be calculated:

<Eighth embodiment>

Please refer to FIG. 15 and FIG. 16, wherein FIG. 15 shows a schematic diagram of an imaging device according to the eighth embodiment of the present invention, and FIG. 16 shows the spherical aberration, astigmatism and distortion of the eighth embodiment in order from left to right Graph. As can be seen from FIG. 15 , the imaging device of the eighth embodiment includes an imaging system (not labeled separately) and an electronic photosensitive element 880 . The imaging system includes a first lens 810, an aperture 800, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, an infrared filter element 860, and an imaging surface 870 from the object side to the image side. , and the electronic photosensitive element 880 is arranged on the imaging surface 870 of the imaging system, wherein there are five lenses (810-850) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 810 has positive refractive power and is made of plastic material. The object-side surface 811 is convex near the axis, and the image-side surface 812 is concave near the axis. Both are aspherical.

The second lens 820 has negative refractive power and is made of plastic material. The object-side surface 821 is concave near the axis, and the image-side surface 822 is concave near the axis. Both are aspherical.

The third lens 830 has positive refractive power and is made of plastic material. The object-side surface 831 is convex near the axis, and the image-side surface 832 is convex near the axis. Both are aspherical.

The fourth lens 840 has negative refractive power and is made of plastic material. The object-side surface 841 is convex near the axis, and the image-side surface 842 is concave near the axis. Both are aspherical. In addition, the image-side surface 842 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 850 has positive refractive power and is made of plastic material. The object-side surface 851 is convex near the axis, and the image-side surface 852 is concave near the axis. Both of them are aspherical. In addition, the image-side surface 852 of the fifth lens includes at least one convex surface off-axis.

The infrared filter element 860 is made of glass, which is disposed between the fifth lens 850 and the imaging surface 870 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the eighth embodiment, the thickness of the first lens 810 on the optical axis is CT1, the thickness of the second lens 820 on the optical axis is CT2, and the thickness of the third lens 830 on the optical axis is CT3. The thickness of the fourth lens 840 on the optical axis is CT4, and the thickness of the fifth lens 850 on the optical axis is CT5, wherein the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 15 and Table 16 below.

In the eighth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 15 and Table 16, the following data can be calculated:

<Ninth Embodiment>

Please refer to FIG. 17 and FIG. 18 , wherein FIG. 17 shows a schematic diagram of an imaging device according to the ninth embodiment of the present invention, and FIG. 18 shows the spherical aberration, astigmatism and distortion of the ninth embodiment in sequence from left to right Graph. It can be seen from FIG. 17 that the imaging device of the ninth embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 980 . The imaging system includes an aperture 900, a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, an infrared filter element 960, and an imaging surface 970 in order from the object side to the image side. , and the electronic photosensitive element 980 is arranged on the imaging surface 970 of the imaging system, wherein there are five lenses (910-950) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 910 has positive refractive power and is made of plastic material. The object-side surface 911 is convex near the axis, and the image-side surface 912 is concave near the axis. Both are aspherical.

The second lens 920 has negative refractive power and is made of plastic material. The object-side surface 921 is convex near the axis, and the image-side surface 922 is concave near the axis. Both are aspherical.

The third lens 930 has a positive refractive power and is made of plastic material. The object-side surface 931 is convex near the axis, and the image-side surface 932 is concave near the axis. Both of them are aspherical.

The fourth lens 940 has positive refractive power and is made of plastic material. The object-side surface 941 is convex near the axis, and the image-side surface 942 is concave near the axis. Both of them are aspherical. In addition, the image-side surface 942 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 950 has positive refractive power and is made of plastic material. The object-side surface 951 is convex near the axis, and the image-side surface 952 is concave near the axis. Both are aspherical. In addition, the image-side surface 952 of the fifth lens includes at least one convex surface off-axis.

The infrared filter element 960 is made of glass, which is disposed between the fifth lens 950 and the imaging surface 970 and does not affect the focal length of the imaging system.

In addition, in the imaging system of the ninth embodiment, the focal length of the first lens 910 is f1, the focal length of the second lens 920 is f2, the focal length of the third lens 930 is f3, the focal length of the fourth lens 940 is f4, and the focal length of the fifth lens The focal length of 950 is f5, which satisfies the following conditions: |f3|>|f1|; |f3|>|f2|; |f3|>|f4|; and |f3|>|f5|.

In the imaging system of the ninth embodiment, the thickness of the first lens 910 on the optical axis is CT1, the thickness of the second lens 920 on the optical axis is CT2, the thickness of the third lens 930 on the optical axis is CT3, and the thickness of the fourth lens 930 on the optical axis is CT3. The thickness of the lens 940 on the optical axis is CT4, the thickness of the fifth lens 950 on the optical axis is CT5, and the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 17 and Table 18 below.

In the ninth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 17 and Table 18, the following data can be calculated:

<Tenth Embodiment>

Please refer to Fig. 19 and Fig. 20, wherein Fig. 19 shows a schematic diagram of an imaging device according to the tenth embodiment of the present invention, and Fig. 20 shows the spherical aberration, astigmatism and distortion of the tenth embodiment in order from left to right Graph. As can be seen from FIG. 19 , the imaging device of the tenth embodiment includes an imaging system (not otherwise labeled) and an electronic photosensitive element 1080 . The imaging system includes an aperture 1000, a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, an infrared filter element 1060, and an imaging surface 1070 in order from the object side to the image side , and the electronic photosensitive element 1080 is arranged on the imaging surface 1070 of the imaging system, wherein there are five lenses (1010-1050) with refractive power in the imaging system, and there is an air gap between any two adjacent lenses with refractive power.

The first lens 1010 has positive refractive power and is made of plastic material. The object-side surface 1011 is convex near the axis, and the image-side surface 1012 is concave near the axis. Both are aspherical.

The second lens 1020 has negative refractive power and is made of plastic material. The object-side surface 1021 is convex near the axis, and the image-side surface 1022 is concave near the axis. Both are aspherical.

The third lens 1030 has positive refractive power and is made of plastic material. The object-side surface 1031 is convex near the axis, and the image-side surface 1032 is convex near the axis, both of which are aspherical.

The fourth lens 1040 has negative refractive power and is made of plastic material. The object-side surface 1041 is convex near the axis, and the image-side surface 1042 is concave near the axis. Both are aspherical. In addition, the image-side surface 1042 of the fourth lens includes at least one convex surface off-axis.

The fifth lens 1050 has a negative refractive power and is made of plastic material. The object-side surface 1051 is convex near the axis, and the image-side surface 1052 is concave near the axis. Both of them are aspherical. In addition, the image-side surface 1052 of the fifth lens includes at least one convex surface off-axis.

The infrared filtering element 1060 is made of glass, and is disposed between the fifth lens 1050 and the imaging surface 1070 without affecting the focal length of the imaging system.

In addition, in the imaging system of the tenth embodiment, the thickness of the first lens 1010 on the optical axis is CT1, the thickness of the second lens 1020 on the optical axis is CT2, and the thickness of the third lens 1030 on the optical axis is CT3. The thickness of the fourth lens 1040 on the optical axis is CT4, the thickness of the fifth lens 1050 on the optical axis is CT5, and the largest of CT1, CT2, CT3, CT4 and CT5 is CT5.

Then refer to Table 19 and Table 20 below.

In the tenth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

Cooperating with Table 19 and Table 20, the following data can be calculated:

<Eleventh embodiment>

Please refer to FIG. 21 , which is a schematic diagram illustrating an electronic device 10 according to an eleventh embodiment of the present invention. The electronic device 10 of the eleventh embodiment is a smart phone, and the electronic device 10 includes an imaging device 11, and the imaging device 11 includes an imaging system (not shown) and an electronic photosensitive element (not shown) according to the present invention, wherein The electronic photosensitive element is arranged on the imaging surface of the imaging system.

<Twelfth embodiment>

Please refer to FIG. 22 , which is a schematic diagram illustrating an electronic device 20 according to a twelfth embodiment of the present invention. The electronic device 20 of the twelfth embodiment is a tablet computer, and the electronic device 20 includes an imaging device 21, and the imaging device 21 includes an imaging system (not shown) and an electronic photosensitive element (not shown) according to the present invention, wherein The electronic photosensitive element is arranged on the imaging surface of the imaging system.

<Thirteenth embodiment>

Please refer to FIG. 23 , which is a schematic diagram illustrating an electronic device 30 according to a thirteenth embodiment of the present invention. The electronic device 30 of the thirteenth embodiment is a head-mounted display (Head-mounted display, HMD). The electronic device 30 includes an imaging device 31, and the imaging device 31 includes an imaging system (not disclosed) according to the present invention and An electronic photosensitive element (not shown in the figure), wherein the electronic photosensitive element is disposed on the imaging surface of the imaging system.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any skilled person can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be based on the scope defined by the appended claims.

Claims (22)

1. an imaging system, it is characterised in that sequentially comprised to image side by thing side:

One first lens, have positive refracting power, and its paraxial place of thing side surface is convex surface；

One second lens, have negative refracting power, and its paraxial place, surface, image side is concave surface；

One the 3rd lens, have refracting power；

One the 4th lens, have refracting power, and its paraxial place, surface, image side is concave surface and off-axis place comprises at least one Convex surface, its thing side surface and surface, image side are all aspheric surface；And

One the 5th lens, have refracting power, and its paraxial place of thing side surface is convex surface, its paraxial place, surface, image side Comprising at least one convex surface for concave surface and off-axis place, its thing side surface and surface, image side are all aspheric surface；

Wherein, the lens in this imaging system with refracting power are five, and wantonly two adjacent have the saturating of refracting power Having a air gap between mirror, the 4th lens thickness on optical axis is CT4, the 3rd lens with this Four lens spacing distance on optical axis is T34, the 4th lens and the 5th lens interval on optical axis Distance is T45, and the focal length of this imaging system is f, and the radius of curvature of the 3rd lens thing side surface is R5, The radius of curvature of the 3rd surface, lens image side is R6, and the abbe number of these the second lens is V2, the 3rd The abbe number of lens is V3, and the abbe number of the 4th lens is V4, and it meets following condition:

CT4/T34<1.20；

CT4/T45<1.60；

|f/R5|+|f/R6|<1.10；And

1.75<(V2+V4)/V3。

Imaging system the most according to claim 1, it is characterised in that the 4th lens thing side surface Paraxial place is convex surface.

Imaging system the most according to claim 2, it is characterised in that the dispersion system of the 3rd lens Number is for V3, and it meets following condition:

V3<30。

Imaging system the most according to claim 2, it is characterised in that the 4th lens are on optical axis Thickness be CT4, the 3rd lens and the 4th lens spacing distance on optical axis are T34, and it meets Following condition:

CT4/T34<1.0。

Imaging system the most according to claim 1, it is characterised in that the 4th lens are on optical axis Thickness be CT4, the 4th lens and the 5th lens spacing distance on optical axis are T45, and it meets Following condition:

CT4/T45<1.48。

Imaging system the most according to claim 1, it is characterised in that the 4th lens are on optical axis Thickness be CT4, the 4th lens and the 5th lens spacing distance on optical axis are T45, and it meets Following condition:

CT4/T45<1.25。

Imaging system the most according to claim 1, it is characterised in that the 3rd lens have the most in the wrong Folding power.

Imaging system the most according to claim 1, it is characterised in that this surface, the first lens image side Paraxial place is concave surface.

Imaging system the most according to claim 1, it is characterised in that the 4th lens thing side surface Radius of curvature be R7, the focal length of this imaging system is f, and it meets following condition:

|R7/f|<3.0。

Imaging system the most according to claim 9, it is characterised in that the f-number of this imaging system For Fno, this first lens thing side surface to imaging surface distance on optical axis is TL, this imaging system The half at maximum visual angle be HFOV, it meets following condition:

1.6<Fno<2.4；

TL<6mm；And

35 degree of < HFOV.

11. imaging systems according to claim 1, it is characterised in that the 4th lens thing side surface Radius of curvature be R7, the focal length of this imaging system is f, and it meets following condition:

|R7/f|<2.3。

12. imaging systems according to claim 1, it is characterised in that the focal length of this imaging system is F, the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and the focal length of the 5th lens is f5, It meets following condition:

|f/f3|+|f/f4|+|f/f5|<0.60。

13. imaging systems according to claim 1, it is characterised in that the focal length of these the first lens is F1, the focal length of these the second lens is f2, and the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, The focal length of the 5th lens is f5, and it meets following condition:

|f3|>|f1|；

|f3|>|f2|；

|f3|>|f4|；And

|f3|>|f5|。

14. imaging systems according to claim 1, it is characterised in that the 4th lens thing side surface Radius of curvature be R7, the radius of curvature on the 4th surface, lens image side is R8, the 5th lens thing side table The radius of curvature in face is R9, and the radius of curvature on the 5th surface, lens image side is R10, this imaging system Focal length is f, and it meets following condition:

(|R7|+|R8|+|R9|+|R10|)/f<3.5。

15. imaging systems according to claim 1, it is characterised in that the 3rd lens and the 4th Lens spacing distance on optical axis is T34, the 4th lens and the 5th lens spacer on optical axis From for T45, these first lens, these second lens, the 3rd lens, the 4th lens and the 5th lens In each two adjacent lens summation of spacing distance on optical axis be Σ AT, it meets following condition:

0.60<(T34+T45)/ΣAT<0.80。

16. imaging systems according to claim 1, it is characterised in that the dispersion system of these the second lens Number is V2, and the abbe number of the 3rd lens is V3, and the abbe number of the 4th lens is V4, and it is full Foot row condition:

V2+V3+V4<90。

17. imaging systems according to claim 1, it is characterised in that these first lens are on optical axis Thickness be CT1, this second lens thickness on optical axis is CT2, the 3rd lens thickness on optical axis Degree is CT3, and the 4th lens thickness on optical axis is CT4, and the 5th lens thickness on optical axis is CT5, wherein in CT1, CT2, CT3, CT4 and CT5, the maximum is CT5.

18. imaging systems according to claim 1, it is characterised in that these second lens are on optical axis Thickness be CT2, the 3rd lens thickness on optical axis is CT3, the 4th lens thickness on optical axis Degree is for CT4, and the 5th lens thickness on optical axis is CT5, and it meets following condition:

(CT2+CT3+CT4)/CT5<1.25。

19. imaging systems according to claim 1, it is characterised in that the 4th surface, lens image side Radius of curvature be R8, the radius of curvature of the 5th lens thing side surface is R9, and it meets following condition:

1.20<R8/R9。

20. imaging systems according to claim 1, it is characterised in that the focal length of this imaging system is F, the radius of curvature of the 3rd lens thing side surface is R5, and the radius of curvature on the 3rd surface, lens image side is R6, it meets following condition:

|f/R5|+|f/R6|<0.75。

21. 1 kinds of image-taking devices, it is characterised in that comprise:

Imaging system as claimed in claim 1；And

One sense electronics optical element, it is arranged at an imaging surface of this imaging system.

22. 1 kinds of electronic installations, it is characterised in that comprise:

Image-taking device as claimed in claim 21.