CN105988199A - Photographing system, image capturing device and electronic device - Google Patents

Abstract

The invention discloses a photographing system, an image capturing device and an electronic device. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region. The second lens element with refractive power has a concave image-side surface at a paraxial region. The third lens element, the fourth lens element and the fifth lens element all have refractive power. The sixth lens element with refractive power has a concave image-side surface at a paraxial region thereof, and has at least one convex image-side surface at an off-axis region thereof, wherein both surfaces thereof are aspheric. The seventh lens element with refractive power has a concave object-side surface at paraxial region, and both surfaces thereof are aspheric. The first lens, the second lens, the third lens and the fourth lens are not moved relative to each other on the optical axis. Any two adjacent lenses of the first lens to the seventh lens have an air space on the optical axis. The invention also discloses an image capturing device with the photographing system and an electronic device with the image capturing device.

Description

Camera system, imaging device and electronic device

technical field

The invention relates to a photography system, an image pickup device and an electronic device, in particular to a photography system and an image pickup device suitable for the electronic device.

Background technique

In recent years, with the vigorous development of miniaturized photographic lenses, the demand for miniature imaging modules has been increasing day by day, and the photosensitive elements of general photographic lenses are nothing more than charge coupled devices (CCD) or complementary metal oxide semiconductor elements. (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor) two types, and with the improvement of semiconductor process technology, the pixel size of the photosensitive element is reduced, and today's electronic products are developing with good functions and thin, light and small appearance. Therefore, , Miniaturized photographic lenses with good imaging quality have become the mainstream in the current market.

In recent years, due to the rapid increase in the specifications of photographic systems mounted on electronic devices such as high-end Smart Phones (Smart Phones), Wearable Devices (Wearable Devices), and Tablet Personal Computers (Tablet Personal Computers), for cameras equipped with large apertures and large photosensitive elements The demand for optical systems will increase accordingly, and the existing five-element and six-element optical systems will not be able to meet higher-level requirements.

Although there is a need to develop a seven-element optical system to meet the requirements of high-end specifications, the number of lenses in the seven-element optical system is large, which is not conducive to the miniaturization of the optical system. Therefore, how to make the optical system maintain the imaging quality and miniaturization of the optical system while configuring multiple lenses, large aperture, and large photosensitive element is one of the problems that the industry wants to solve.

Contents of the invention

The object of the present invention is to provide a photographic system, an imaging device and an electronic device, wherein the photographic system has seven lenses with refractive power. In the photography system provided by the present invention, the image-side surface of the sixth lens is concave at the near optical axis, and the object-side surface of the seventh lens is concave at the near optical axis. Thereby, the position of the exit pupil of the photographic system can be moved to an imaging plane, which helps to effectively suppress the back focus of the photographic system and maintain the miniaturization of the photographic system. In addition, when certain conditions are met, the curvature configurations of the sixth lens and the seventh lens can be effectively allocated, which helps to reduce the sensitivity of the photography system and improve the manufacturing yield.

The invention provides a photography system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side. The first lens has positive refractive power, and its object-side surface is convex at the near optical axis. The second lens has refractive power, and its image-side surface is concave at the near optical axis. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power, its image-side surface is concave at the near optical axis, its image-side surface has at least one convex surface at off-axis, and both its object-side surface and image-side surface are aspherical. The seventh lens has refractive power, its object-side surface is concave at the near optical axis, and its object-side surface and image-side surface are both aspherical. There are seven lenses with refractive power in the photography system. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens on the optical axis. The focal length of the photography system is f, the radius of curvature of the image-side surface of the sixth lens is R12, and the curvature radius of the object-side surface of the seventh lens is R13, which satisfy the following conditions:

0.30<(f/R12)-(f/R13).

The present invention further provides an image capturing device, which includes the aforementioned photographic system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the photographic system.

The present invention further provides an electronic device, which includes the aforementioned image capturing device.

The present invention further provides a photography system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side. The first lens has positive refractive power, and its object-side surface is convex at the near optical axis. The second lens has negative refractive power. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power, its image-side surface is concave at the near optical axis, its image-side surface has at least one convex surface at off-axis, and both its object-side surface and image-side surface are aspherical. The seventh lens has refractive power, its object-side surface is concave at the near optical axis, and its object-side surface and image-side surface are both aspherical. There are seven lenses with refractive power in the photography system. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens on the optical axis. The focal length of the photography system is f, the radius of curvature of the image-side surface of the sixth lens is R12, the curvature radius of the object-side surface of the seventh lens is R13, the dispersion coefficient of the first lens is V1, and the dispersion coefficient of the second lens is V2. Meet the following conditions:

0.30<(f/R12)-(f/R13); and

25<V1-V2<45.

The present invention further provides an image capturing device, which includes the aforementioned photographic system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the photographic system.

The present invention further provides an electronic device, which includes the aforementioned image capturing device.

When (f/R12)-(f/R13) satisfy the above conditions, the curvature configurations of the sixth lens and the seventh lens can be effectively allocated to reduce the sensitivity of the camera system and improve the manufacturing yield.

When V1-V2 meets the above conditions, it is helpful to correct the chromatic aberration of the photographic system.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

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

Fig. 2 is the spherical aberration, astigmatism and distortion curves of the first embodiment in sequence from left to right;

3 is 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 sequence from left to right;

5 is 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 order 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 order from left to right;

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

Fig. 12 is the spherical aberration, astigmatism and distortion curves of the sixth embodiment in order from left to right;

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

Fig. 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 sequence from left to right;

17 is a schematic diagram showing the position of the maximum effective radius projected onto the optical axis of the image-side surface of the seventh lens and the intersection point of the object-side surface of the seventh lens on the optical axis according to the photographic system shown in FIG. 5;

FIG. 18 shows a schematic diagram of an electronic device according to the present invention;

FIG. 19 shows a schematic diagram of another electronic device according to the present invention;

FIG. 20 is a schematic diagram of yet another electronic device according to the present invention.

Among them, reference signs

Image taking device: 10

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Sixth lens: 160, 260, 360, 460, 560, 660, 760, 860

Object side surface: 161, 261, 361, 461, 561, 661, 761, 861

Image side surface: 162, 262, 362, 462, 562, 662, 762, 862

Seventh lens: 170, 270, 370, 470, 570, 670, 770, 870

Object side surface: 171, 271, 371, 471, 571, 671, 771, 871

Image side surface: 172, 272, 372, 472, 572, 672, 772, 872

Infrared filter elements: 180, 280, 380, 480, 580, 680, 780, 880

Imaging surface: 190, 290, 390, 490, 590, 690, 790, 890

Electronic photosensitive element: 195, 295, 395, 495, 595, 695, 795, 895

Dr1r8: the distance on the optical axis from the object side surface of the first lens to the image side surface of the fourth lens

Dr9r14: Distance on the optical axis from the object-side surface of the fifth lens to the image-side surface of the seventh lens

f: focal length of the camera system

f1: focal length of the first lens

f2: focal length of the second lens

f3: focal length of the third lens

f345: Combined focal length of the third lens, fourth lens and fifth lens

f4: focal length of the fourth lens

f5: focal length of the fifth lens

f6: focal length of the sixth lens

f7: focal length of the seventh lens

Fno: the aperture value of the camera system

HFOV: half of the maximum field of view in a photographic system

R12: Radius of curvature of the image-side surface of the sixth lens

R13: radius of curvature of the object-side surface of the seventh lens

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

V1: Dispersion coefficient of the first lens

V2: Dispersion coefficient of the second lens

ΣAT: Between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens, between the fifth lens and the sixth lens, and between the sixth lens The sum of the distances from the seventh lens on the optical axis

detailed description

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

The photography system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side. There are seven lenses with refractive power in the photography system.

There is an air space between any two adjacent lenses in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens on the optical axis, that is, the first lens, The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can be seven single non-bonded lenses with refractive power. Because the process of cemented lenses is more complicated than that of non-cemented lenses, especially the joint surface of the two lenses needs to have a high-precision curved surface in order to achieve a high degree of adhesion when the two lenses are joined, and in the process of joining, it is also possible to distort due to misalignment. Causes axis-shift defects and affects the overall optical imaging quality. Therefore, the first lens to the seventh lens in the photographic system can be seven single non-bonded lenses with refractive power, thereby effectively solving the problem caused by the cemented lens. In addition, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens do not move relative to each other on the optical axis. In other words, the air gaps between any two adjacent lenses among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all fixed values.

The first lens has positive refractive power, and its object-side surface is convex at the near optical axis. In this way, the positive refractive force required by the camera system can be provided, and the overall length of the camera system can be properly configured.

The second lens may have negative refractive power, and its image-side surface may be concave at the near optical axis. Thereby, the aberration generated by the first lens can be corrected to improve the imaging quality.

The third lens has refractive power. Thereby, the sensitivity of the photographic system can be effectively reduced, and the distribution of the refractive power of the photographic system can be adjusted to avoid excessive increase of astigmatism and distortion around the image, thereby improving the imaging quality.

The fourth lens has refractive power. In this way, the refractive power of the third lens can be adjusted to make the distribution of the refractive power of the photography system more even.

The fifth lens has refractive power, and its image-side surface can be convex at the near optical axis. Thereby, it is helpful to correct the astigmatism of the photography system, so as to improve the imaging quality.

The sixth lens has refractive power, its object side surface can be convex at the near optical axis, its image side surface can be concave at the near optical axis, its object side surface can have at least one concave surface at the off-axis, and its image side surface can be at least one concave surface at the near optical axis. The off-axis has at least one convex surface. Thereby, the principal point of the photographing system can be kept away from the image-side end, thereby shortening the back focus of the photographing system, which is beneficial to the miniaturization of the photographing system. Furthermore, the incident angle of the off-axis field of view light on the photosensitive element can be suppressed, so as to increase the receiving efficiency of the image photosensitive element and further correct the aberration of the off-axis field of view.

The seventh lens can have negative refractive power, its object-side surface is concave at the near optical axis, its image-side surface can be concave at the near optical axis, and its image-side surface can have at least one convex at off-axis. Thereby, the curvature configuration of the sixth lens and the seventh lens can move the position of the exit pupil of the photographic system to an imaging plane, which helps to effectively suppress the back focus of the photographic system and maintain the miniaturization of the photographic system. In addition, the position of the maximum effective radius of the image-side surface of the seventh lens is projected onto the optical axis to form a projected position P1. The projection position P1 can be closer to the object side of the imaging system than the intersection point P2 of the object side surface of the seventh lens on the optical axis (that is to say, the maximum effective radius position of the image side surface of the seventh lens is projected onto the position P1 on the optical axis to the imaging system. The distance between the object side of the system on the optical axis is smaller than the distance from the intersection point P2 of the object side surface of the seventh lens on the optical axis to the object side of the imaging system on the optical axis). Thereby, it is beneficial to correct peripheral image aberration and image curvature. Please refer to FIG. 17 , which is a schematic diagram showing the projected position of the maximum effective radius of the image-side surface of the seventh lens onto the optical axis and the intersection point of the object-side surface of the seventh lens on the optical axis in the photographic system shown in FIG. 5 .

The focal length of the photographing system is f, the radius of curvature of the image-side surface of the sixth lens is R12, and the radius of curvature of the object-side surface of the seventh lens is R13, which satisfies the following condition: 0.30<(f/R12)-(f/R13). In this way, the curvature configurations of the sixth lens and the seventh lens can be effectively allocated, which helps to reduce the sensitivity of the camera system and improve the manufacturing yield. Preferably, it satisfies the following condition: 0.40<(f/R12)-(f/R13)<3.5. More preferably, it satisfies the following condition: 0.50<(f/R12)-(f/R13)<3.0.

The dispersion coefficient of the first lens is V1, and the dispersion coefficient of the second lens is V2, which satisfy the following condition: 25<V1-V2<45. Thereby, it is helpful to correct the chromatic aberration of the photographic system.

The focal length of the photography system is f, and the composite focal length of the third lens, the fourth lens and the fifth lens is f345, which satisfies the following condition: -0.30<f/f345<0.60. Thereby, the total refractive strength of the third lens, the fourth lens and the fifth lens can be slowed down, which helps to reduce problems such as too large aberration caused by a single lens with too strong refractive power in the photography system.

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, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f6. The focal length of the lens is f7, which satisfies the following conditions: |f1|<|fx| and |f7|<|fx|, where x=2, 3, 4, 5 or 6. Thereby, it is beneficial to balance the configuration of the refractive power of the photographic system, and can enhance the correction of the aberration of the photographic system.

The distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens is Dr1r8, and the distance on the optical axis from the object-side surface of the fifth lens to the image-side surface of the seventh lens is Dr9r14, which meets the following conditions: 0.75 <Dr1r8/Dr9r14<1.5. Thereby, the distance between the lenses is more appropriate, which helps to reduce the total length of the photography system.

The focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following condition: |f1/f2|<0.80. Thereby, it is helpful to shorten the total length of the photographic system and correct the aberration of the photographic system.

The aperture value of the photography system is Fno, which satisfies the following condition: Fno≤2.25. Thereby, the aperture size of the photographic system can be adjusted appropriately, so that the photographic system can still adopt a higher shutter speed to capture clear images when the light is not sufficient.

The focal length of the photography 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|<1.5. In this way, the configuration of the refractive power of the camera system can be balanced to effectively correct the aberration of the camera system while reducing the sensitivity of the camera system.

Between the first lens and the second lens, between the second lens and the third lens, between the third lens and the fourth lens, between the fourth lens and the fifth lens, between the fifth lens and the sixth lens, and between the sixth lens and the first lens The sum of the distances between the seven lenses on the optical axis is ΣAT, the distance between the third lens and the fourth lens on the optical axis is T34, and the distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies The following conditions: 3.0<ΣAT/(T34+T45)<10.0. Thereby, the distance between the lenses can be properly adjusted, which helps to shorten the total length of the optical photography system and maintain its miniaturization.

The distance between the first lens and the second lens on the optical axis, the distance between the second lens and the third lens on the optical axis, the distance between the third lens and the fourth lens on the optical axis, the distance between the fourth lens and the first lens Among the distance between the five lenses on the optical axis, the distance between the fifth lens and the sixth lens on the optical axis, and the distance between the sixth lens and the seventh lens on the optical axis, the distance between the sixth lens and the seventh lens is The separation distance on the optical axis is the maximum value. In this way, the configuration of the distance between the lenses is beneficial to make the assembly more compact, thereby shortening the total length of the camera system to maintain its miniaturization.

The dispersion coefficient of the second lens is V2, which satisfies the following condition: 10<V2<30. Thereby, it is helpful to correct the chromatic aberration of the photographic system.

The configuration of the aperture in the photography system can be a front aperture or a middle aperture. 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 surface. If the aperture is a front aperture, it can make the exit pupil of the photography system (Exit Pupil) and the imaging surface have a longer distance, so that it has a telecentric (Telecentric) effect, and can increase the CCD or CMOS receiving image of the electronic photosensitive element. Efficiency; if it is a central aperture, it will help expand the field of view of the system, making the photography system have the advantage of a wide-angle lens.

In the camera system disclosed in the present invention, the material of the lens can be plastic or glass. When the material of the lens is glass, the degree of freedom in the configuration of the refractive power can be increased. In addition, when the lens is made of plastic, the production cost can be effectively reduced. In addition, an aspheric surface can be set on the lens surface, and the aspheric surface can be easily made into a shape other than a spherical surface, so that more control variables can be obtained to reduce aberrations, thereby reducing the number of lenses required, thus effectively reducing the total optical cost. length.

In the photographic system disclosed in 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 near optical axis; if the lens surface is concave and the concave position is not defined, it means that The lens surface is concave at the near optical axis. If the refractive power or focal length of the lens does not define its area position, it means that the refractive power or focal length of the lens is the refractive power or focal length of the lens at the near optical axis.

In the photographic system disclosed in the present invention, the imaging surface (Image Surface) of the photographic system can be a plane or a curved surface with any curvature according to the difference of its corresponding electronic photosensitive element, especially a curved surface with a concave surface facing the direction of the object side. .

In the photographing system of the present invention, at least one aperture can be provided, and its position can be arranged before the first lens, between each lens or after the last lens. The field stop (Field Stop) is used to reduce stray light and help improve image quality.

The present invention further provides an image capturing device, which includes the aforementioned photographic system and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the photographic system. Preferably, the imaging device may further include a barrel (Barrel Member), a support device (Holder Member) or a combination thereof.

Please refer to Fig. 18, Fig. 19 and Fig. 20, the imaging device 10 can be applied in various aspects to smart phones (as shown in Fig. 18), tablet computers (as shown in Fig. 19) and wearable devices (as shown in Fig. 20 )Wait. Preferably, the electronic device may further include control units (Control Units), display units (DisplayUnits), storage units (Storage Units), random access memory (RAM) or a combination thereof.

The photographic system of the present invention has the characteristics of excellent aberration correction and good imaging quality. The present invention can also be applied to electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, somatosensory game consoles, driving recorders, reversing developing devices, and wearable devices in various aspects. middle. The electronic device disclosed above is only an example to illustrate the practical application of the present invention, and does not limit the scope of application of the imaging device of the present invention.

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 a first embodiment of the present invention, and FIG. 2 is a diagram of spherical aberration, astigmatism and distortion curves of the first embodiment from left to right. As can be seen from FIG. 1 , the image capturing device includes a camera system (not otherwise labeled) and an electronic photosensitive element 195 . The photographic 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, a sixth lens 160, a seventh lens 170, and an infrared lens from the object side to the image side. The filter element (IR-cut Filter) 180 and the imaging surface 190 are filtered. Wherein, the electronic photosensitive element 195 is disposed on the imaging surface 190 . There are seven lenses (110-170) with refractive power in the photography system. The first lens 110 , the second lens 120 , the third lens 130 , the fourth lens 140 , the fifth lens 150 , the sixth lens 160 and the seventh lens 170 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 110 , the second lens 120 , the third lens 130 , the fourth lens 140 , the fifth lens 150 , the sixth lens 160 and the seventh lens 170 on the optical axis. .

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

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

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

The fourth lens 140 has positive refractive power and is made of plastic material. The object-side surface 141 is convex at the near optical axis, and the image-side surface 142 is convex at the near optical axis. Both surfaces are aspherical.

The fifth lens 150 has negative refractive power and is made of plastic material. The object side surface 151 is concave at the near optical axis, and the image side surface 152 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 160 has positive refractive power and is made of plastic material. Its object-side surface 161 is convex at the near optical axis, its image-side surface 162 is concave at the near optical axis, and both surfaces are aspherical. The side surface 161 has at least one concave surface off-axis, like the side surface 162 has at least one convex surface off-axis.

The seventh lens 170 has negative refractive power and is made of plastic material. Its object-side surface 171 is concave at the near optical axis, its image-side surface 172 is concave at the near optical axis, and both surfaces are aspherical. The side surface 172 has at least one convexity off-axis.

The material of the infrared filtering filter element 180 is glass, which is disposed between the seventh lens 170 and the imaging surface 190 and does not affect the focal length of the camera system.

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

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

;in:

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

In the photographic system of the first embodiment, the focal length of the photographic system is f, the aperture value (F-number) of the photographic system is Fno, and half of the maximum viewing angle in the photographic system is HFOV, and its numerical value is as follows: f=5.19 millimeters (mm) , Fno=1.85, HFOV=36.0 degrees (deg.).

The dispersion coefficient of the second lens 120 is V2, which satisfies the following condition: V2=23.5.

The dispersion coefficient of the first lens 110 is V1, and the dispersion coefficient of the second lens 120 is V2, which satisfy the following condition: V1-V2=32.40.

The distance on the optical axis from the first lens object side surface 111 to the fourth lens image side surface 142 is Dr1r8, and the distance on the optical axis from the fifth lens object side surface 151 to the seventh lens image side surface 172 is Dr9r14, which satisfies The following conditions: Dr1r8/Dr9r14 = 0.94.

between the first lens 110 and the second lens 120, between the second lens 120 and the third lens 130, between the third lens 130 and the fourth lens 140, between the fourth lens 140 and the fifth lens 150, between the fifth lens 150 and the The sum of the distances between the six lenses 160 and between the sixth lens 160 and the seventh lens 170 on the optical axis is ΣAT, the distance between the third lens 130 and the fourth lens 140 on the optical axis is T34, and the distance between the fourth lens 140 and the seventh lens 170 is T34. The distance between the fifth lens 150 on the optical axis is T45, which satisfies the following condition: ΣAT/(T34+T45)=6.17.

The focal length of the photography system is f, the radius of curvature of the sixth lens image side surface 162 is R12, and the radius of curvature of the seventh lens object side surface 171 is R13, which satisfies the following conditions: (f/R12)-(f/R13)= 0.32.

The focal length of the first lens 110 is f1, and the focal length of the second lens 120 is f2, which satisfy the following condition: |f1/f2|=0.49.

The focal length of the photography 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|=1.16.

The focal length of the photography system is f, and the composite focal length of the third lens 130, the fourth lens 140 and the fifth lens 150 is f345, which satisfies the following condition: f/f345=0.20

Please 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 millimeters (mm), and surfaces 0 to 18 represent surfaces from the object side to the image side in sequence. Table 2 shows the aspheric surface data in the first embodiment, where k is the cone coefficient in the aspheric curve equation, and A4 to A16 represent the 4th to 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 a second embodiment of the present invention, and FIG. 4 is a diagram of spherical aberration, astigmatism and distortion curves of the second embodiment from left to right. As can be seen from FIG. 3 , the imaging device includes a camera system (not otherwise labeled) and an electronic photosensitive element 295 . The photographic 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, a sixth lens 260, a seventh lens 270, and an infrared lens from the object side to the image side. The filter element 280 and the imaging surface 290 are filtered out. Wherein, the electronic photosensitive element 295 is disposed on the imaging surface 290 . There are seven lenses (210-270) with refractive power in the photography system. The first lens 210 , the second lens 220 , the third lens 230 , the fourth lens 240 , the fifth lens 250 , the sixth lens 260 and the seventh lens 270 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, the sixth lens 260 and the seventh lens 270 on the optical axis. .

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

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

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

The fourth lens 240 has positive refractive power and is made of plastic material. The object-side surface 241 is convex at the near optical axis, and the image-side surface 242 is convex at the near optical axis. Both surfaces are aspherical.

The fifth lens 250 has positive refractive power and is made of plastic material. The object-side surface 251 is concave at the near optical axis, and the image-side surface 252 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 260 has a positive refractive power and is made of plastic material. Its object-side surface 261 is convex at the near optical axis, its image-side surface 262 is concave at the near optical axis, and both surfaces are aspherical. The side surface 261 has at least one concave surface off-axis, like the side surface 262 has at least one convex surface off-axis.

The seventh lens 270 has negative refractive power and is made of plastic material. Its object-side surface 271 is concave at the near optical axis, its image-side surface 272 is concave at the near optical axis, and both surfaces are aspherical. The side surface 272 has at least one convex surface off-axis.

The material of the infrared filtering filter element 280 is glass, which is disposed between the seventh lens 270 and the imaging surface 290 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Third embodiment>

Please refer to FIG. 5 and FIG. 6 , wherein FIG. 5 shows a schematic diagram of an imaging device according to a third embodiment of the present invention, and FIG. 6 is a diagram of spherical aberration, astigmatism and distortion curves of the third embodiment in order from left to right. As can be seen from FIG. 5 , the image capturing device includes a camera system (not otherwise labeled) and an electronic photosensitive element 395 . The photography system includes the first lens 310, aperture 300, second lens 320, third lens 330, fourth lens 340, fifth lens 350, sixth lens 360, seventh lens 370, infrared The filter element 380 and the imaging surface 390 are filtered out. Wherein, the electronic photosensitive element 395 is disposed on the imaging surface 390 . There are seven lenses (310-370) with refractive power in the photography system. The first lens 310 , the second lens 320 , the third lens 330 , the fourth lens 340 , the fifth lens 350 , the sixth lens 360 and the seventh lens 370 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, the sixth lens 360 and the seventh lens 370 on the optical axis. .

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

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

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

The fourth lens 340 has positive refractive power and is made of plastic material. The object-side surface 341 is convex at the near optical axis, and the image-side surface 342 is convex at the near optical axis. Both surfaces are aspherical.

The fifth lens 350 has positive refractive power and is made of plastic material. The object side surface 351 is concave at the near optical axis, and the image side surface 352 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 360 has negative refractive power and is made of plastic material. Its object-side surface 361 is convex at the near optical axis, and its image-side surface 362 is concave at the near optical axis. Both surfaces are aspherical. The side surface 361 has at least one concave surface off-axis, like the side surface 362 has at least one convex surface off-axis.

The seventh lens 370 has negative refractive power and is made of plastic material. Its object side surface 371 is concave at the near optical axis, its image side surface 372 is concave at the near optical axis, and both surfaces are aspherical. The side surface 372 has at least one convexity off-axis.

The material of the infrared filtering filter element 380 is glass, which is disposed between the seventh lens 370 and the imaging surface 390 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Fourth Embodiment>

Please refer to FIG. 7 and FIG. 8 , wherein FIG. 7 shows a schematic diagram of an imaging device according to a fourth embodiment of the present invention, and FIG. 8 is a diagram of spherical aberration, astigmatism and distortion curves of the fourth embodiment from left to right. As can be seen from FIG. 7 , the imaging device includes a camera system (not labeled separately) and an electronic photosensitive element 495 . The photography system includes the first lens 410, aperture 400, second lens 420, third lens 430, fourth lens 440, fifth lens 450, sixth lens 460, seventh lens 470, infrared The filter element 480 and the imaging surface 490 are filtered out. Wherein, the electronic photosensitive element 495 is disposed on the imaging surface 490 . There are seven lenses (410-470) with refractive power in the photography system. The first lens 410 , the second lens 420 , the third lens 430 , the fourth lens 440 , the fifth lens 450 , the sixth lens 460 and the seventh lens 470 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the fifth lens 450, the sixth lens 460 and the seventh lens 470 on the optical axis. .

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

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

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

The fourth lens 440 has positive refractive power and is made of plastic material. The object-side surface 441 is convex at the near optical axis, and the image-side surface 442 is concave at the near optical axis. Both surfaces are aspherical.

The fifth lens 450 has positive refractive power and is made of plastic material. The object side surface 451 is concave at the near optical axis, and the image side surface 452 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 460 has negative refractive power and is made of plastic material. The object-side surface 461 is convex at the near optical axis, and the image-side surface 462 is concave at the near optical axis. Both surfaces are aspherical.

The seventh lens 470 has negative refractive power and is made of plastic material. The object side surface 471 is concave at the near optical axis, and the image side surface 472 is concave at the near optical axis. Both surfaces are aspherical.

The material of the infrared filtering filter element 480 is glass, which is disposed between the seventh lens 470 and the imaging surface 490 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<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 is a diagram of spherical aberration, astigmatism, and distortion curves of the fifth embodiment in sequence from left to right. As can be seen from FIG. 9 , the imaging device includes a photographing system (not otherwise labeled) and an electronic photosensitive element 595 . The photographic 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, a sixth lens 560, a seventh lens 570, and an infrared lens from the object side to the image side. The filter element 580 and the imaging surface 590 are filtered out. Wherein, the electronic photosensitive element 595 is disposed on the imaging surface 590 . There are seven lenses (510-570) with refractive power in the photography system. The first lens 510 , the second lens 520 , the third lens 530 , the fourth lens 540 , the fifth lens 550 , the sixth lens 560 and the seventh lens 570 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 510, the second lens 520, the third lens 530, the fourth lens 540, the fifth lens 550, the sixth lens 560 and the seventh lens 570 on the optical axis. .

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

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

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

The fourth lens 540 has negative refractive power and is made of plastic material. The object-side surface 541 is convex at the near optical axis, and the image-side surface 542 is concave at the near optical axis. Both surfaces are aspherical.

The fifth lens 550 has positive refractive power and is made of plastic material. Its object side surface 551 is concave at the near optical axis, its image side surface 552 is convex at the near optical axis, and both surfaces are aspherical.

The sixth lens 560 has a positive refractive power and is made of plastic material. Its object-side surface 561 is convex at the near optical axis, and its image-side surface 562 is concave at the near optical axis. Both surfaces are aspherical. The side surface 561 has at least one concave surface off-axis, like the side surface 562 has at least one convex surface off-axis.

The seventh lens 570 has negative refractive power and is made of plastic material. Its object-side surface 571 is concave at the near optical axis, its image-side surface 572 is concave at the near optical axis, and both surfaces are aspherical. The side surface 572 has at least one convexity off-axis.

The material of the infrared filtering filter element 580 is glass, which is disposed between the seventh lens 570 and the imaging surface 590 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Sixth embodiment>

Please refer to FIG. 11 and FIG. 12 , wherein FIG. 11 shows a schematic diagram of an imaging device according to a sixth embodiment of the present invention, and FIG. 12 is a diagram of spherical aberration, astigmatism and distortion curves of the sixth embodiment in order from left to right. As can be seen from FIG. 11 , the imaging device includes a camera system (not otherwise labeled) and an electronic photosensitive element 695 . The photographic 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, a sixth lens 660, a seventh lens 670, and an infrared lens from the object side to the image side. The filter element 680 and the imaging surface 690 are filtered out. Wherein, the electronic photosensitive element 695 is disposed on the imaging surface 690 . There are seven lenses (610-670) with refractive power in the photographic system. The first lens 610 , the second lens 620 , the third lens 630 , the fourth lens 640 , the fifth lens 650 , the sixth lens 660 and the seventh lens 670 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 610, the second lens 620, the third lens 630, the fourth lens 640, the fifth lens 650, the sixth lens 660 and the seventh lens 670 on the optical axis. .

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

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

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

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

The fifth lens 650 has negative refractive power and is made of plastic material. The object side surface 651 is concave at the near optical axis, and the image side surface 652 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 660 has positive refractive power and is made of plastic material. Its object-side surface 661 is convex at the near optical axis, and its image-side surface 662 is concave at the near optical axis. Both surfaces are aspherical. The side surface 661 has at least one concave surface off-axis, like the side surface 662 has at least one convex surface off-axis.

The seventh lens 670 has negative refractive power and is made of plastic material. Its object side surface 671 is concave at the near optical axis, and its image side surface 672 is concave at the near optical axis. Both surfaces are aspherical. The side surface 672 has at least one convexity off-axis.

The material of the infrared filtering filter element 680 is glass, which is disposed between the seventh lens 670 and the imaging surface 690 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Seventh embodiment>

Please refer to FIG. 13 and FIG. 14 , wherein FIG. 13 shows a schematic diagram of an imaging device according to a seventh embodiment of the present invention, and FIG. 14 is a diagram of spherical aberration, astigmatism and distortion curves of the seventh embodiment from left to right. As can be seen from FIG. 13 , the imaging device includes a photographing system (not otherwise labeled) and an electronic photosensitive element 795 . The photography system includes a first lens 710, an aperture 700, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an infrared lens from the object side to the image side. The filter element 780 and the imaging surface 790 are filtered out. Wherein, the electronic photosensitive element 795 is disposed on the imaging surface 790 . There are seven lenses (710-770) with refractive power in the photography system. The first lens 710 , the second lens 720 , the third lens 730 , the fourth lens 740 , the fifth lens 750 , the sixth lens 760 and the seventh lens 770 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 710, the second lens 720, the third lens 730, the fourth lens 740, the fifth lens 750, the sixth lens 760 and the seventh lens 770 on the optical axis. .

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

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

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

The fourth lens 740 has negative refractive power and is made of plastic material. The object side surface 741 is concave at the near optical axis, and the image side surface 742 is convex at the near optical axis. Both surfaces are aspherical.

The fifth lens 750 has negative refractive power and is made of plastic material. The object side surface 751 is concave at the near optical axis, and the image side surface 752 is convex at the near optical axis. Both surfaces are aspherical.

The sixth lens 760 has positive refractive power and is made of plastic material. Its object-side surface 761 is convex at the near optical axis, and its image-side surface 762 is concave at the near optical axis. Both surfaces are aspherical. The side surface 761 has at least one concave surface off-axis, like the side surface 762 has at least one convex surface off-axis.

The seventh lens 770 has negative refractive power and is made of plastic material. Its object-side surface 771 is concave at the near optical axis, its image-side surface 772 is concave at the near optical axis, and both surfaces are aspherical. The side surface 772 has at least one convexity off-axis.

The material of the infrared filtering filter element 780 is glass, which is arranged between the seventh lens 770 and the imaging surface 790 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

<Eighth embodiment>

Please refer to FIG. 15 and FIG. 16 , wherein FIG. 15 shows a schematic diagram of an imaging device according to an eighth embodiment of the present invention, and FIG. 16 is a graph of spherical aberration, astigmatism and distortion of the eighth embodiment from left to right. As can be seen from FIG. 15 , the imaging device includes a photographic system (not otherwise labeled) and an electronic photosensitive element 895 . The photographic system includes an aperture 800, a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an infrared lens from the object side to the image side. The filter element 880 and the imaging surface 890 are filtered out. Wherein, the electronic photosensitive element 895 is disposed on the imaging surface 890 . There are seven lenses (810-870) with refractive power in the photography system. The first lens 810 , the second lens 820 , the third lens 830 , the fourth lens 840 , the fifth lens 850 , the sixth lens 860 and the seventh lens 870 do not move relative to each other on the optical axis. There is an air space between any two adjacent lenses in the first lens 810, the second lens 820, the third lens 830, the fourth lens 840, the fifth lens 850, the sixth lens 860 and the seventh lens 870 on the optical axis. .

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

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

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

The fourth lens 840 has negative refractive power and is made of plastic material. The object side surface 841 is concave at the near optical axis, and the image side surface 842 is concave at the near optical axis. Both surfaces are aspherical.

The fifth lens 850 has positive refractive power and is made of plastic material. Its object side surface 851 is concave at the near optical axis, its image side surface 852 is convex at the near optical axis, and both surfaces are aspherical.

The sixth lens 860 has positive refractive power and is made of plastic material. Its object-side surface 861 is convex at the near optical axis, and its image-side surface 862 is concave at the near optical axis. Both surfaces are aspherical. The side surface 861 has at least one concave surface off-axis, like the side surface 862 has at least one convex surface off-axis.

The seventh lens 870 has negative refractive power and is made of plastic material. Its object-side surface 871 is concave at the near optical axis, and its image-side surface 872 is concave at the near optical axis. Both surfaces are aspherical. The side surface 872 has at least one convexity off-axis.

The material of the infrared filter element 880 is glass, which is disposed between the seventh lens 870 and the imaging surface 890 and does not affect the focal length of the camera system.

Please 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 described in the table below are the same as those in the first embodiment, and will not be repeated here.

The above-mentioned image capturing device can be installed in an electronic device. The photography system provided by the present invention uses seven lenses with refractive power, wherein the image-side surface of the sixth lens is concave at the near optical axis, and the object-side surface of the seventh lens is concave at the near optical axis. Thereby, the position of the exit pupil of the photographic system can be moved to an imaging plane, which helps to effectively suppress the back focus of the photographic system and maintain the miniaturization of the photographic system. In addition, when certain conditions are met, the curvature configurations of the sixth lens and the seventh lens can be effectively allocated, which helps to reduce the sensitivity of the photography system and improve the manufacturing yield. The photographic system provided by the present invention uses seven lenses with refractive power, matched with appropriate lens surface shape and specific conditions, which helps to provide a high-quality photographic system that maintains miniaturization.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the appended claims.

Claims (28)

1. a camera chain, it is characterised in that sequentially comprised to image side by thing side:

One first lens, have positive refracting power, and its thing side surface is convex surface at dipped beam axle；

One second lens, have refracting power, and its surface, image side is concave surface at dipped beam axle；

One the 3rd lens, have refracting power；

One the 4th lens, have refracting power；

One the 5th lens, have refracting power；

One the 6th lens, have refracting power, and its surface, image side is concave surface at dipped beam axle, its surface, image side in Off-axis place has at least one convex surface, and its thing side surface and surface, image side are all aspheric surface；And

One the 7th lens, have refracting power, and its thing side surface is concave surface at dipped beam axle, its thing side surface with Surface, image side is all aspheric surface；

Wherein, the lens in this camera chain with refracting power are seven, these first lens, these second lens, 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens each other in Without relative movement on optical axis, these first lens, these second lens, the 3rd lens, the 4th lens, should 5th lens, the 6th lens and the 7th lens are respectively provided with between wantonly two adjacent lens on optical axis Gas is spaced；

Wherein, the focal length of this camera chain is f, and the radius of curvature on the 6th surface, lens image side is R12, The radius of curvature of the 7th lens thing side surface is R13, and it meets following condition:

0.30<(f/R12)-(f/R13)。

Camera chain the most according to claim 1, it is characterised in that the 7th lens have negative bending Folding power, the 7th surface, lens image side is concave surface at dipped beam axle, and the 7th surface, lens image side is in off axis Place has at least one convex surface.

Camera chain the most according to claim 2, it is characterised in that the focal length of this camera chain is F, the 3rd lens, the 4th lens are f345 with the synthesis focal length of the 5th lens, and it meets following bar Part:

-0.30<f/f345<0.60。

Camera chain the most according to claim 2, it is characterised in that the 7th surface, lens image side Maximum effective radius position be projected on the friendship on optical axis of position the relatively the 7th lens thing side surface of optical axis Point is closer to the thing side of this camera chain.

Camera chain the most according to claim 2, 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 the focal length of the 6th lens is f6, and the focal length of the 7th lens is f7, It meets following condition:

|f1|<|fx|；And

| f7 | < | fx |, wherein x=2,3,4,5,6.

Camera chain the most according to claim 1, it is characterised in that these second lens have negative bending Folding power, the abbe number of these the first lens is V1, and the abbe number of these the second lens is V2, under it meets Row condition:

25<V1-V2<45。

Camera chain the most according to claim 6, it is characterised in that this first lens thing side surface Be Dr1r8 to the 4th surface, lens image side distance on optical axis, the 5th lens thing side surface to this Seven surface, lens image sides distance on optical axis is Dr9r14, and it meets following condition:

0.75<Dr1r8/Dr9r14<1.5。

Camera chain the most according to claim 7, it is characterised in that the 6th lens thing side surface It is convex surface at dipped beam axle, and the 6th lens thing side surface has at least one concave surface in off-axis place.

Camera chain the most according to claim 7, 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 it meets following condition:

|f1/f2|<0.80。

Camera chain the most according to claim 1, it is characterised in that the 5th surface, lens image side Being convex surface at dipped beam axle, the f-number of this camera chain is Fno, and it meets following condition:

Fno≤2.25。

11. camera chains according to claim 10, it is characterised in that the focal length of this camera chain For f, the radius of curvature on the 6th surface, lens image side is R12, the curvature of the 7th lens thing side surface half Footpath is R13, and it meets following condition:

0.40<(f/R12)-(f/R13)<3.5。

12. camera chains according to claim 10, it is characterised in that the focal length of this camera chain For 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|<1.5。

13. camera chains according to claim 10, it is characterised in that these first lens with this Between two lens, between these the second lens and the 3rd lens, between the 3rd lens and the 4th lens, the 4th Between lens and the 5th lens, between the 5th lens and the 6th lens and the 6th lens are saturating with the 7th Between mirror, on optical axis, the summation of spacing distance is Σ AT, and the 3rd lens and the 4th lens are on optical axis Spacing distance is T34, and the 4th lens and the 5th lens spacing distance on optical axis are T45, and it is full Foot row condition:

3.0<ΣAT/(T34+T45)<10.0。

14. camera chains according to claim 1, it is characterised in that these first lens with this second Spacing distance on optical axis of lens spacing distance on optical axis, these second lens and the 3rd lens, should 3rd lens and the 4th lens spacing distance, the 4th lens and the 5th lens on optical axis are in optical axis On spacing distance, spacing distance on optical axis of the 5th lens and the 6th lens and the 6th lens Among the 7th lens spacing distance on optical axis, the 6th lens and the 7th lens are on optical axis Spacing distance is maximum.

15. camera chains according to claim 1, it is characterised in that the focal length of this camera chain is F, the radius of curvature on the 6th surface, lens image side is R12, the radius of curvature of the 7th lens thing side surface For R13, it meets following condition:

0.50<(f/R12)-(f/R13)<3.0。

16. 1 kinds of image-taking devices, it is characterised in that comprise:

Camera chain as claimed in claim 1；And

One sense electronics optical element, wherein this sense electronics optical element is arranged on an imaging surface of this camera chain.

17. 1 kinds of electronic installations, it is characterised in that comprise:

Image-taking device as claimed in claim 16.

18. 1 kinds of camera chains, it is characterised in that sequentially comprised to image side by thing side:

One first lens, have positive refracting power, and its thing side surface is convex surface at dipped beam axle；

One second lens, have negative refracting power；

One the 3rd lens, have refracting power；

One the 4th lens, have refracting power；

One the 5th lens, have refracting power；

One the 6th lens, have refracting power, and its surface, image side is concave surface at dipped beam axle, its surface, image side in Off-axis place has at least one convex surface, and its thing side surface and surface, image side are all aspheric surface；And

One the 7th lens, have refracting power, and its thing side surface is concave surface at dipped beam axle, its thing side surface with Surface, image side is all aspheric surface；

Wherein, the lens in this camera chain with refracting power are seven, these first lens, these second lens, 3rd lens, the 4th lens, the 5th lens, the 6th lens and the 7th lens each other in Without relative movement on optical axis, these first lens, these second lens, the 3rd lens, the 4th lens, should 5th lens, the 6th lens and the 7th lens are respectively provided with between wantonly two adjacent lens on optical axis Gas is spaced；

Wherein, the focal length of this camera chain is f, and the radius of curvature on the 6th surface, lens image side is R12, The radius of curvature of the 7th lens thing side surface is R13, and the abbe number of these the first lens is V1, and this is years old The abbe number of two lens is V2, and it meets following condition:

0.30<(f/R12)-(f/R13)；And

25<V1-V2<45。

19. camera chains according to claim 18, it is characterised in that the 7th lens image side table Face is concave surface at dipped beam axle, and the 7th surface, lens image side has at least one convex surface in off-axis place, and this is first years old The focal length of lens is f1, and the focal length of these the second lens is f2, and it meets following condition:

|f1/f2|<0.80。

20. camera chains according to claim 19, it is characterised in that the focal length of this camera chain For f, the radius of curvature on the 6th surface, lens image side is R12, the curvature of the 7th lens thing side surface half Footpath is R13, and it meets following condition:

0.40<(f/R12)-(f/R13)<3.5。

21. camera chains according to claim 19, it is characterised in that these first lens with this Between two lens, between these the second lens and the 3rd lens, between the 3rd lens and the 4th lens, the 4th Between lens and the 5th lens, between the 5th lens and the 6th lens and the 6th lens are saturating with the 7th Between mirror, on optical axis, the summation of spacing distance is Σ AT, and the 3rd lens and the 4th lens are on optical axis Spacing distance is T34, and the 4th lens and the 5th lens spacing distance on optical axis are T45, and it is full Foot row condition:

3.0<ΣAT/(T34+T45)<10.0。

22. camera chains according to claim 18, it is characterised in that the 6th lens thing side table Face is convex surface at dipped beam axle, and the 6th lens thing side surface has at least one concave surface in off-axis place, and this is second years old The abbe number of lens is V2, and it meets following condition:

10<V2<30。

23. camera chains according to claim 18, it is characterised in that the focal length of this camera chain For 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|<1.5。

24. camera chains according to claim 18, it is characterised in that the focal length of these the first lens For f1, the focal length of these the second lens is f2, and the focal length of the 3rd lens is f3, the focal length of the 4th lens For f4, the focal length of the 5th lens is f5, and the focal length of the 6th lens is f6, the focal length of the 7th lens For f7, it meets following condition:

|f1|<|fx|；And

| f7 | < | fx |, wherein x=2,3,4,5 or 6.

25. camera chains according to claim 18, it is characterised in that this first lens thing side table Face to the 4th surface, lens image side distance on optical axis is Dr1r8, and the 5th lens thing side surface is to being somebody's turn to do 7th surface, lens image side distance on optical axis is Dr9r14, and it meets following condition:

0.75<Dr1r8/Dr9r14<1.5。

26. camera chains according to claim 18, it is characterised in that the focal length of this camera chain For f, the radius of curvature on the 6th surface, lens image side is R12, the curvature of the 7th lens thing side surface half Footpath is R13, and it meets following condition:

0.50<(f/R12)-(f/R13)<3.0。

27. 1 kinds of image-taking devices, it is characterised in that comprise:

Camera chain as claimed in claim 18；And

One sense electronics optical element, wherein this sense electronics optical element is arranged on an imaging surface of this camera chain.

28. 1 kinds of electronic installations, it is characterised in that comprise:

Image-taking device as claimed in claim 27.