Patent ID: 12196917

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed to” another element, it can be directly on another element or an intervening element may also be present therebetween. When an element is considered to be “connected to” another element, it can be directly connected to another element or an intervening element may be present at the same time. Terms “inner”, “outer”, “left”, “right” and similar expressions used herein are for illustrative purposes only, and do not mean that they are the only embodiments.

Referring toFIG.1, an imaging lens100is provided according to the present disclosure. The imaging lens10includes, successively in order from an object side to an image side, a first third lens L1 having a refractive power, a second lens L2 having a refractive power, and a third lens L3 having a refractive power.

The first lens L1 includes an object side surface S1 and an image side surface S2. The second lens L2 includes an object side surface S3 and an image side surface S4. The third lens L3 includes an object side surface S5 and an image side surface S6. In addition, an imaging surface S9 is provided on an image side of the third lens L3. The imaging surface S9 may be a photosensitive surface of a photosensitive element. The object side surface S1 of the first lens L1 is convex on an optical axis. The object side surface S3 of the second lens L2 is convex on the optical axis.

In addition, it should be noted that a system or an optical system as described below may be composed of elements such as a reflector, an imaging lens100, and a filter.

In some embodiments, the first lens L1, the second lens L2, and the third lens L3 are all made of plastic, such that the manufacture cost and the weight can be reduced. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 are all made of glass, and the lenses made of glass have better optical performance. Preferably, the first lens L1 may be a glass lens. The lens made of glass has higher heat resistance, so as to prevent the lens from being prone to aging in a high temperature environment and reducing the optical performance. It should be noted that, according to actual manufacture requirements, the first lens L1, the second lens L2, and the third lens L3 can also be made of the above materials in arbitrary combination, which is not limited herein.

In some embodiments, a stop STO is provided on an object side of the first lens L1. In other embodiments, the stop STO may also be arranged between the first lens L1 and the third lens L3. The stop STO can limit the amount of light passing through the imaging lens100.

When describing that the stop STO is provided on the object side of the first lens L1, or describing that the imaging lens100is provided with the stop STO, the first lens L1, the second lens L2 and the like, successively in order from the object side to the image side, a projection of the stop STO on the optical axis of the first lens L1 may or may not overlap with a projection of the first lens L1 on the optical axis.

In some embodiments, an infrared cut-off filter L4 is provided on the image side of the third lens L3. The infrared cut-off filter L4 includes an object side surface S7 and an image side surface S8. The infrared cut-off filter L4 can allow light at visible light wavebands to be transmitted through and isolate infrared light, thus preventing the infrared light from reaching the photosensitive element to affect the imaging of the visible light, thereby improving the imaging effect of the imaging lens100in the daytime. It should be noted that the infrared cut-off filter L4 may not be provided in the imaging lens100. Instead, the infrared cut-off filter is assembled between the imaging lens100and the photosensitive element when the imaging lens100is assembled with the photosensitive element.

Referring toFIG.1, in some embodiments, the imaging lens100further includes a reflector120, which is arranged on the object side of the first lens L1. The light carrying information of a subject can be reflected by the reflector120into the lens group (composed of the first lens L1, the second lens L2, and the third lens L3) of the imaging lens100. Specifically, the reflector120may be a prism, which is arranged on the object side of the first lens L1. The prism can change the propagation direction of light by 90° to reflect the light to the first lens L1, the second lens L2, and the third lens L3. By providing the reflector120, the imaging lens100can be more easily applied to a device with a small size (especially with a small thickness). In other embodiments, the reflector120may also be a plane mirror.

Specifically, in some of the embodiments, the prism includes an incident surface G1, a reflecting surface G2, and an outgoing surface G3. The outgoing surface G3 is perpendicular to the optical axis of the first lens L1. The reflecting surface G2 and the outgoing surface G3 form an angle of 45 degrees. The incident surface G1 is perpendicular to the outgoing surface G3 and forms an angle of 45 degrees with the reflecting surface G2. The light carrying the information of the subject enters the prism through the incident surface G1, and then the light is reflected by the reflecting surface G2 and then emitted from the outgoing surface G3 to the first lens L1.

In some embodiments, the object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical. The aspheric surface shape formula is:

Z=c⁢r21+1-(k+1)⁢c2⁢r2+∑i⁢A⁢i⁢ri
where Z is a distance from a corresponding point on an aspheric surface to a plane tangent to a vertex of the surface, r is a distance from a corresponding point on the aspheric surface to the optical axis, c is a curvature of the vertex of the aspheric surface, k is a conic constant, and Ai is a coefficient corresponding to the ithhigh-order term in the surface shape formula.

In some embodiments, the optical system100satisfies the following condition:
FNO*L>15.5;

where FNO is an f-number of the imaging lens100, L is an aperture diameter of the first lens L1, and the unit of L is mm. Specifically, the FNO*L may be equal to 17.50, 17.55, 17.60, 17.65, 17.70, 17.73, or 17.74. When the above condition is satisfied, the optical system has a larger focal length range to meet the telephoto characteristics, and the focal length thereof is longer than the focal length of the conventional telephoto system. Meanwhile, the optical system also has the amount of light that matches the focal length range, so as to increase brightness of the picture during telephoto capturing. As such, it is beneficial to improve the capturing quality when the optical system is applied to the telephoto capturing. When FNO*L<15.5, although the optical system has enough amount of light to ensure the contrast of the captured image, it is difficult to ensure that the optical system has the telephoto characteristic.

In some embodiments, the optical system100satisfies a condition:
1<(ΣET*EPD)/f<3;

where ΣET is a distance from the stop STO to a portion of the image side surface S6 of the third lens L3 at the maximum effective radius in the direction parallel to the optical axis, EPD is an entrance pupil diameter of the imaging lens100, and f is an effective focal length of the imaging lens100. Specifically, the ratio (ΣET*EPD)/f may be equal to 1.15, 1.35, 1.55, 1.75, 1.95, 2.15, 2.35, or 2.40. ΣET determines the total length of the edge of the optical system, and EPD is the entrance pupil diameter of the optical system. That is, ΣET*EPD determines the size of the entire optical system. Therefore, when the above condition is satisfied, the miniaturization design and telephoto performance of the imaging lens100can be met at the same time. If (ΣET*EPD)/f>3, the volume of the system is too large to meet the miniaturization design requirements. When (ΣET*EPD)/f<1, the volume of the system is too small, the phase difference correction is difficult, and the optical performance parameters does not meet the design requirements.

In some embodiments, the optical system100satisfies a condition:
−37<f1/CT1<22;

where f1 is a focal length of the first lens L1, and CT1 is a thickness of the first lens L1 at the optical axis. Specifically, the ratio f1/CT1 may be equal to −35.00, −25.00, −15.00, −5.00, 5.00, 10.00 or 15.00. A ratio between the focal length and the thickness of the first lens L1 determines how the second lens L2 and the third lens L3 are combined to balance the aberration generated by the first lens L1. When f1/CT1>22, it is difficult to correct the aberration of the system. When f1/CT1<−37, the light angle emitted from the image side surface S2 of the first lens L1 becomes larger, resulting in a smaller value of the focal length of the first lens L1, which cannot provide sufficient focal length for the system.

In some embodiments, the optical system100satisfies a condition:
1.0<TTL/|f|<1.2;

where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and f is an effective focal length of the imaging lens100. Specifically, the ratio TTL/|f| may be equal to 1.03, 1.05, 1.07, 1.09, 1.11, 1.13, 1.15, or 1.17. The three lenses in the imaging lens100cooperate with each other. When the above condition is satisfied, the length of the imaging lens100can be adjusted reasonably to avoid the length of the lens from being too long, so as to meet the requirements of reasonable focal length and miniaturization design. When TTL/|f|<1.0, the optical length of the lens group is too short, which increases the sensitivity of the system and makes it difficult to correct aberrations. When TTL/|f|>1.2, the optical length of the lens group is too long, causing the main light angle of the light incident on the imaging surface S9 to be too large, which shortens the effective focal length of the imaging lens100, and is unable to meet a reasonable focal length, thereby being unable to realize the telephoto design.

In some embodiments, the optical system100satisfies a condition:
0.7<TTL/|f1|<2.7;

where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and f1 is a focal length of the first lens L1. Specifically, the ratio TTL/|f1| may be equal to 0.90, 0.95, 1.00, 1.20, 1.50, 2.00, or 2.50. When the above condition is satisfied, it is beneficial to correct the aberration of the optical system. When TTL/|f1|<0.7, the optical length of the imaging lens100is too short, which increases the sensitivity of the system and makes it difficult to correct aberrations. When TTL/|f1|>2.7, the ratio of the optical length of the imaging lens100to the focal length of the first lens L1 is too large, the combination of the second lens L2 and the third lens is difficult to balance the aberrations generated by the first lens L1, resulting in poor imaging quality, which cannot meet the capturing requirements.

In some embodiments, the optical system100satisfies a condition:
−585<(f2+f3)/CT2<30;

where f2 is a focal length of the second lens L2, f3 is a focal length of the third lens L3, and CT2 is a thickness of the second lens L2 at the optical axis. Specifically, the ratio (f2+f3)/CT2 may be equal to −570.00, −5.00, −1.00, 1.00, 20.00, 25.00 or 28.00. When the above condition is satisfied, the refractive powers of the second lens L2 and the third lens L3 can be reasonably distributed to balance the aberration generated by the first lens L1, so as to reduce the tolerance sensitivity of the system, and improve the imaging quality of the system. When (f2+f3)/CT2≤−585, the center thickness of the second lens L2 is too large, resulting in that the overall length of the optical system is too long. When (f2+f3)/CT2≥30, the center thickness of the second lens L2 is too small, resulting in manufacturing difficulties.

In some embodiments, the optical system100satisfies a condition:
−0.8<f23/f<10;

where f23 is a combined focal length of the second lens L2 and the third lens L3, and f is an effective focal length of the imaging lens100. Specifically, the ratio f23/f may be equal to −0.70, −0.65, 0.30, 0.55, 3.00, 3.60, 9.00 or 9.30. When the above condition is satisfied, the refractive powers of the second lens L2 and the third lens L3 can be reasonably distributed to effectively correct the aberration of the system. When f23/f≥10, the refractive power provided by the second lens L2 and the third lens L3 is insufficient, and it is difficult to correct the aberrations of the system. When f23/f≤−0.8, and the second lens L2 and the third lens L3 are plastic lenses, the focal position of the imaging lens100changes greatly as temperature changes, resulting in the increased tolerance sensitivity of the imaging lens100.

In some embodiments, the optical system100satisfies a condition:
−5<R2/f1<5;

where R2 is a radius of curvature of the image side surface S2 of the first lens L1 at the optical axis, and f1 is the focal length of the first lens L1. Specifically, the ratio R2/f1 may be equal to −4.00, −3.50, 0.20, 0.30, 0.80, 0.90, 4.00 or 4.50. When the above condition is satisfied, the image side surface S2 of the first lens L1 has an appropriate radius of curvature at the optical axis, which is beneficial to correct aberrations. When R2/f1<−5, the radius of curvature of the image side surface S2 of the first lens L1 at the optical axis is too large, the surface curvature becomes larger, the forming yield is low, and it is difficult to manufacture the lens. When R2/f1>5, the radius of curvature of the image side surface S2 of the first lens L1 at the optical axis does not match the focal length of the first lens L1, resulting in excessive aberration of the optical system and difficult correction.

In some embodiments, the optical system100satisfies a condition:
11<BFL<16;

where BFL is the shortest distance from the image side surface S6 of the third lens L3 to the imaging surface S9 of the imaging lens100in the direction parallel to the optical axis, and the unit of BFL is mm. Specifically, the BFL may be 12.80, 13.40, 14.00, 14.60, 14.80, 15.30, or 15.50. When the above condition is satisfied, it can ensure that the system has a sufficient focusing range during assembly, and improve the assembly yield of the lens module. In addition, the imaging lens100can have a larger focal depth, which is beneficial to obtain more depth information of the subject.

In some embodiments, the optical system100satisfies a condition:
91<TTL/SL<3450;

where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and SL is a distance from the stop STO to a portion of the object side S1 of the first lens L1 at the maximum effective radius in the direction parallel to the optical axis. Specifically, the ratio TTL/SL may be equal to 95.00, 100.00, 3100.00, 3200.00, 3300.00, or 3400.00. When TTL/SL>3450, the system is too long to meet the requirements of minimized design. When TTL/SL<91, the system cannot correct the edge spherical aberration. When the total optical length of the system is fixed, the stop STO serves to shield the light at an edge of the lens, thereby correcting spherical aberration. If the arrangements of the stop STO and the total optical length are unreasonable, the expected imaging quality requirements cannot be achieved.

In some embodiments, the optical system100satisfies a condition:
0.13<ΣET(len)/TTL<0.25;

where ΣET(len) is the sum of thicknesses of the first lens L1, the second lens L2, and the third lens L3 at the respective maximum effective radius thereof, and TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis. Specifically, the ratio ΣET(len)/TTL may be equal to 0.16, 0.18, 0.19, 0.20, 0.22, or 0.23. When ΣET(len)/TTL<0.13, the edge thickness may be too thin, the manufacture is difficult to process, and the assembly stability is poor. When ΣET(len)/TTL>0.25, the optical system is too long, which does not satisfy the original intention of minimized design.

In some embodiments, the optical system100satisfies a condition:
0.06<ET12/f<0.2;

where ET12 is the sum of thicknesses of the first lens L1 and the second lens L2 at the respective maximum effective radius thereof, and f is an effective focal length of the imaging lens100. Specifically, the ratio ET12/f may be equal to 0.08, 0.10, 0.12, 0.14, 0.15, 0.16, or 0.17. If ET12/f≥0.2, while meeting the processing requirements, the imaging lens100cannot meet the telephoto characteristics. When ET12/f<0.06, the sensitivity of the system is poor, which is disadvantageous for processing.

In some embodiments, the imaging lens100and the photosensitive element are assembled together to form a camera module. The photosensitive element is arranged on the imaging surface S9 of the imaging lens100, and the camera module satisfies a condition:
4<TTL/Imgh<8;

where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and Imgh is half of a diagonal length of an effective pixel area of the photosensitive element. Specifically, the ratio TTL/Imgh may be equal to 6.80, 6.90, 7.00, 7.20, 7.40, 7.60, or 7.70. When TTL/Imgh<4, the photosensitive element cannot receive complete light information, and the light at the edge reaches an edge of the photosensitive element to produce stray light. When TTL/Imgh>8, the total length of the system does not match the image height, resulting in an incomplete imaging or a too long system.

First Embodiment

Referring to the first embodiment shown inFIG.1, the imaging lens100includes, successively in order from the object side to the image side, a stop STO, a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, and an infrared cut-off filter L4.FIG.2is a graph showing longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens100according to the first embodiment, where the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

An object side surface S1 of the first lens L1 is convex at an optical axis, an image side surface S2 of the first lens L1 is concave at the optical axis. The object side S1 of the first lens L1 is convex at its circumference, and the image side surface S2 of the first lens L1 is concave at its circumference. An object side surface S3 of the second lens L2 is convex at the optical axis, an image side surface S4 of the second lens L2 is concave at the optical axis. The object side surface S3 of the second lens L2 is convex at its circumference, and the image side surface S4 of the second lens L2 is concave at its circumference. An object side surface S5 of the third lens L3 is concave at the optical axis, an image side surface S6 of the third lens L3 is convex at the optical axis. The object side surface S5 of the third lens L3 is concave at its circumference, and the image side surface S6 of the third lens L3 is convex at its circumference.

It should be noted that when describing that a side surface of the lens at the optical axis (a central area of the side surface) is convex, it can be understood that an area of this side surface of the lens close to the optical axis is convex. Therefore, it can also be determined that the side surface is convex at its paraxial area. When describing a side surface of the lens is concave at its circumference, it can be understood that an area of the side surface is concave when approaching the maximum effective radius. For example, when the side surface is convex at the optical axis and is also convex at its circumference, a shape of the side surface in a direction from its center (the optical axis) to its edge may be completely convex, or may be first convex at its center and be then transitioned to be concave, and then become convex when approaching the maximum effective radius. These are only an example to illustrate various shapes and structures (concave-convex relationship) of the side surface at the optical axis and the circumference, and the various shapes and structures (concave-convex relationship) of the side surface are not fully embodied, but other situations can be derived from the above examples.

The first lens L1, the second lens L2 and the third lens L3 are all made of plastic.

The object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical.

Continuing to refer toFIG.1, in some embodiments, the imaging lens100further includes a prism. The prism is arranged on the object side of the first lens L1 to reflect the light carrying information of a subject to a lens group composed of the first lens L1, the second lens L2, and the third lens L3.

In addition, the imaging lens100also satisfies the following conditions:

FNO*L=17.44; where FNO is an f-number of the imaging lens100, L is an aperture diameter of the first lens L1, and the unit of L is mm. When the above condition is satisfied, the optical system has a larger focal length range, which is longer than the focal length of the conventional telephoto system, to meet the telephoto characteristics. As such, the optical system also has the amount of light that matches the focal length range to increase brightness of the picture during telephoto capturing. Thus, it is beneficial to improve the capturing quality when the optical system is applied to the telephoto capturing.

(ΣET*EPD)/f=2.45; where ΣET is a distance from the stop STO to a portion of the image side surface S6 of the third lens L3 at the maximum effective radius in the direction parallel to the optical axis, EPD is an entrance pupil diameter of the imaging lens100, and f is an effective focal length of the imaging lens100. ΣET determines the total length of the edge of the optical system, and EPD is the entrance pupil diameter of the optical system. That is, ΣET*EPD determines the size of the entire optical system. Therefore, when the above condition is satisfied, the miniaturization design and telephoto performance of the imaging lens100can be met at the same time.

f1/CT1=8.64; where f1 is a focal length of the first lens L1, and CT1 is a thickness of the first lens L1 at the optical axis.

TTL/|f|=1.18; where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and f is an effective focal length of the imaging lens100. The three lenses in the imaging lens100cooperate with each other, and when the above condition is satisfied, the length of the imaging lens100can be adjusted reasonably to avoid the length of the lens from being too long, so as to meet the requirements of reasonable focal length and miniaturization design.

TTL/|f1|=1.24; where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and f1 is a focal length of the first lens L1. When the above condition is satisfied, it is beneficial to correct the aberration of the optical system.

(f2+f3)/CT2=0.79; where f2 is a focal length of the second lens L2, f3 is a focal length of the third lens L3, and CT2 is a thickness of the second lens L2 at the optical axis. When the above condition is satisfied, the second lens L2 and the third lens L3 can reasonably arrange the refractive power to balance the aberration generated by the first lens L1, reduce the tolerance sensitivity of the system, and improve the imaging quality of the system.

f23/f=9.46; where f23 is a combined focal length of the second lens L2 and the third lens L3, and f is an effective focal length of the imaging lens100. When the above condition is satisfied, the refractive powers of the second lens L2 and the third lens L3 can be reasonably distributed to effectively correct the aberration of the system.

R2/f1=4.14; where R2 is a radius of curvature of the image side surface S2 of the first lens L1 at the optical axis, and f1 is the focal length of the first lens L1. When the above condition is satisfied, the image side surface of the first lens L1 has an appropriate radius of curvature at the optical axis, which is beneficial to correct aberrations.

BFL=14.95; where BFL is the shortest distance from the image side surface S6 of the third lens L3 to the imaging surface S9 of the imaging lens100in the direction parallel to the optical axis, and the unit of BFL is mm. When the above condition is satisfied, it can ensure that the system has a sufficient focusing range during assembly, and improve the assembly yield of the lens module. In addition, the imaging lens100can have a larger focal depth, which is beneficial to obtain more depth information of the subject.

TTL/SL=3413.83; where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and SL is a distance from the stop STO to a portion of the object side S1 of the first lens L1 at the maximum effective radius in the direction parallel to the optical axis.

ΣET(len)/TTL=0.20; where ΣET(len) is the sum of thicknesses of the first lens L1, the second lens L2, and the third lens L3 at the respective maximum effective radius thereof, and TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis.

ET12/f=0.17; where ET12 is the sum of thicknesses of the first lens L1 and the second lens L2 at the respective maximum effective radius thereof, and f is an effective focal length of the imaging lens100.

When the photosensitive element is arranged on the imaging surface S9 of the imaging lens100, a condition is further satisfied: TTL/Imgh=7.82; where TTL is a distance from the object side surface S1 of the first lens L1 to the imaging surface S9 of the imaging lens100on the optical axis, and Imgh is half of a diagonal length of an effective pixel area of the photosensitive element.

In addition, various parameters of the imaging lens100are shown in Table 1 and Table 2. The elements from the object surface to the image side are arranged in the order of the elements in Table 1 from top to bottom. The surface numbers 6 and 7 indicate the object side surface S1 and the image side surface S2 of the first lens L1, respectively. That is, in the same lens, the surface with the smaller surface number is the object side surface, and the surface with the larger surface number is the image side surface. The Y radius in Table 1 is the radius of curvature of the object side surface or image side surface indicated by corresponding surface number at the optical axis. In the “thickness” parameter column of the first lens L1, the first value (absolute value) is the thickness of the lens on the optical axis, and the second value is the distance from the image side surface of the lens to the object side surface of the latter lens on the optical axis. The value of the stop STO in the “thickness” parameter column is the distance from the stop STO to the vertex of the object side surface of the latter lens (the vertex refers to the intersection of the lens and the optical axis) on the optical axis. Here, the default is that the direction from the object side surface S1 of the first lens L1 to the image side surface S6 of the third lens L3 is the negative direction of the optical axis. When the value of the “thickness” is positive, it means that the stop STO is arranged on the right side of the vertex of the object side surface of the lens (refer toFIG.1). If the value of the “thickness” of the stop STO is negative, the stop STO is on the left side of the vertex of the object side surface of the lens. In addition, the surface numbers 2 to 4 indicate the incident surface G1, the reflecting surface G2, and the outgoing surface G3 of the prism, respectively (refer toFIG.1). The absolute value of the corresponding “thickness” parameter is the distance from the surface to the next surface on the optical path. The value of the thickness in the surface number 4 is the distance from the outgoing surface G3 to the stop STO on the optical path. In addition, the surface whose surface number is 1 in the table is a virtual surface that simulates the light-emitting surface in the design program.

Table 2 is a table of relevant parameters of the aspheric surface of each lens in Table 1, where K is the conic constant and Ai is the coefficient corresponding to the ithhigher order term in the aspheric surface shape formula.

In addition, in the following embodiments, the refractive index and focal length of each lens are values at the reference wavelength. In each of the embodiments, preferentially, the calculation result of the condition is based on the data in the optical element parameter table of the corresponding embodiment (such as Table 1 of the first embodiment) and the aspheric coefficient table (such asFIG.2of the first embodiment).

In the first embodiment, the effective focal length of the imaging lens100is indicated by f, and f=17.41 mm. The f-number is indicated by FNO, and FNO=4.9. The angle of field of view is indicated by FOV, and FOV=17.06 degrees (deg.). The distance from the object side surface S1 of the first lens L1 to the imaging surface S9 on the optical axis is indicated by TTL, and TTL=20.48 mm.

TABLE 1First Embodimentf = 17.41 mm, FNO = 4.9, FOV = 17.06 degrees, TTL = 20.48 mmThick-FocalSurfaceSurfaceSurfaceY radiusnessRefractiveAbbeLengthNumberNameShape(mm)(mm)Materialindexnumber(mm)0ObjectSphericalInfiniteInfiniteSurface1VirtualSphericalInfinite8.35Surface2PrismSphericalInfinite2.50Glass1.5264.17InfiniteSurface3PrismSphericalInfinite−2.50Surface4PrismSphericalInfinite−1.35Surface5StopSphericalInfinite0.246FirstAspherical−8.07−1.92Plastic1.5556.1116.567LensAspherical−68.55−0.018SecondAspherical−3.65−0.94Plastic1.6423.52−10.579LensAspherical−2.14−1.1610ThirdAspherical13.01−1.50Plastic1.5556.1111.3111LensAspherical4.36−6.7412InfraredSphericalInfinite−0.21Glass13Cut-offSphericalInfinite−8.00Filter14ImagingSphericalInfinite0.00SurfaceNote:the reference wavelength is 555 nm

TABLE 2First EmbodimentAspheric CoefficientSurfaceNumber67891011K0.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A4−3.62E−03−1.90E−023.17E−032.55E−02−6.80E−03−1.20E−03A6−6.64E−044.38E−038.45E−031.24E−023.34E−037.15E−04A81.02E−04−2.26E−03−2.69E−03−2.95E−031.65E−041.17E−06A10−5.85E−064.22E−044.19E−043.87E−04−1.24E−04−1.90E−05A120.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A140.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A160.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A180.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A200.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00

Second Embodiment

Referring to the second embodiment shown inFIG.3, the imaging lens100includes, successively in order from the object side to the image side, a stop STO, a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, and an infrared cut-off filter L4. In some embodiments, the imaging lens100further includes a prism arranged on an object side of the first lens L1. In addition,FIG.4is a graph showing longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens100according to the second embodiment, where the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

An object side surface S1 of the first lens L1 is convex at an optical axis, an image side surface S2 of the first lens L1 is concave at the optical axis. The object side S1 of the first lens L1 is convex at its circumference, and the image side surface S2 of the first lens L1 is concave at its circumference. An object side surface S3 of the second lens L2 is convex at the optical axis, an image side surface S4 of the second lens L2 is concave at the optical axis. The object side surface S3 of the second lens L2 is convex at its circumference, and the image side surface S4 of the second lens L2 is concave at its circumference. An object side surface S5 of the third lens L3 is convex at the optical axis, an image side surface S6 of the third lens L3 is convex at the optical axis. The object side surface S5 of the third lens L3 is convex at its circumference, and the image side surface S6 of the third lens L3 is convex at its circumference.

The object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical.

In addition, the first lens L1, the second lens L2 and the third lens L3 are all made of plastic.

In the second embodiment, the effective focal length of the imaging lens100is indicated by f, and f=17.40 mm. The f-number is indicated by FNO, and FNO=4.9. The angle of field of view is indicated by FOV, and FOV=17.12 degrees (deg.). The distance from the object side surface S1 of the first lens L1 to the imaging surface S9 on the optical axis is indicated by TTL, and TTL=20.43 mm.

In addition, various parameters of the optical system100are shown in Table 3 and Table 4. Definitions of the various parameters can be obtained from the first embodiment, and which will not be repeated herein.

TABLE 3Second Embodimentf = 17.40 mm, FNO = 4.9, FOV = 17.12 degrees, TTL = 20.43 mmThick-FocalSurfaceSurfaceSurfaceY radiusnessRefractiveAbbeLengthNumberNameShape(mm)(mm)Materialindexnumber(mm)0ObjectSphericalInfiniteInfiniteSurface1VirtualSphericalInfinite5.00Surface2PrismSphericalInfinite2.50Glass1.5264.17InfiniteSurface3PrismSphericalInfinite−2.50Surface4PrismSphericalInfinite−1.35Surface5StopSphericalInfinite0.186FirstAspherical−13.17−1.31Plastic1.5556.1121.407LensAspherical100.00−0.028SecondAspherical−3.56−1.00Plastic1.6423.52−10.989LensAspherical−2.11−1.0510ThirdAspherical−100.00−1.50Plastic1.5556.119.9411LensAspherical5.71−7.3512InfraredSphericalInfinite−0.21Glass13Cut-offSphericalInfinite−8.00Filter14ImagingSphericalInfinite0.00SurfaceNote:the reference wavelength is 555 nm

TABLE 4Second EmbodimentAspheric CoefficientSurfaceNumber67891011K0.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A4−5.15E−03−2.13E−021.05E−032.48E−02−8.68E−03−1.99E−03A6−9.73E−044.23E−037.90E−031.18E−023.33E−035.72E−04A81.71E−04−2.22E−03−2.69E−03−2.98E−031.15E−045.47E−05A10−2.56E−064.25E−044.07E−044.26E−04−1.19E−04−3.04E−05A120.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A140.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A160.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A180.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A200.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00

According to the information of the various parameters provided as above, the following data can be derived.

Second Embodimentf (mm)17.40TTL/|f1|0.96FNO4.9(f2 + f3)/CT2−1.04FOV (degree)17.12f23/f3.48TTL (mm)20.43R2/f14.67FNO*L17.44BFL (mm)15.56(ΣET*EPD)/f2.46TTL/SL3405.50f1/CT116.34ΣET(len)/TTL0.17TTL/|f|1.17ET12/f0.14TTL/Imgh7.80

Third Embodiment

Referring to the third embodiment shown inFIG.5, the imaging lens100includes, successively in order from the object side to the image side, a stop STO, a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a negative refractive power, and an infrared cut-off filter L4. In some embodiments, the imaging lens100further includes a prism arranged on an object side of the first lens L1. In addition,FIG.6is a graph showing longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens100according to the third embodiment, where the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

An object side surface S1 of the first lens L1 is convex at an optical axis, an image side surface S2 of the first lens L1 is convex at the optical axis. The object side S1 of the first lens L1 is convex at its circumference, and the image side surface S2 of the first lens L1 is concave at its circumference. An object side surface S3 of the second lens L2 is convex at the optical axis, an image side surface S4 of the second lens L2 is concave at the optical axis. The object side surface S3 of the second lens L2 is concave at its circumference, and the image side surface S4 of the second lens L2 is convex at its circumference. An object side surface S5 of the third lens L3 is concave at the optical axis, an image side surface S6 of the third lens L3 is convex at the optical axis. The object side surface S5 of the third lens L3 is concave at its circumference, and the image side surface S6 of the third lens L3 is convex at its circumference.

The object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical.

In addition, the first lens L1, the second lens L2 and the third lens L3 are all made of plastic.

In the third embodiment, the effective focal length of the imaging lens100is indicated by f, and f=17.50 mm. The f-number is indicated by FNO, and FNO=4.9. The angle of field of view is indicated by FOV, and FOV=16.95 degrees (deg.). The distance from the object side surface S1 of the first lens L1 to the imaging surface S9 on the optical axis is indicated by TTL, and TTL=18.94 mm.

In addition, various parameters of the optical system100are shown in Table 5 and Table 6. Definitions of the various parameters can be obtained from the first embodiment, and which will not be repeated herein.

TABLE 5Third Embodimentf = 17.50 mm, FNO = 4.9, FOV = 16.95 degrees, TTL = 18.94 mmThick-FocalSurfaceSurfaceSurfaceY radiusnessRefractiveAbbeLengthNumberNameShape(mm)(mm)Materialindexnumber(mm)0ObjectSphericalInfiniteInfiniteSurface1VirtualSphericalInfinite2.85Surface2PrismSphericalInfinite2.50Glass1.5264.17InfiniteSurface3PrismSphericalInfinite−2.50Surface4PrismSphericalInfinite−0.85Surface5StopSphericalInfinite0.236First LensAspherical−10.31−1.04Plastic1.5556.117.497Aspherical6.54−0.038SecondAspherical−3.04−0.42Plastic1.6423.52−12.789LensAspherical−2.10−1.0410ThirdAspherical3.70−1.50Plastic1.5556.11−231.6911LensAspherical4.36−6.7012InfraredSphericalInfinite−0.21Glass13Cut-offSphericalInfinite−8.00Filter14ImagingSphericalInfinite0.00SurfaceNote:the reference wavelength is 555 nm

TABLE 6Third EmbodimentAspheric CoefficientSurfaceNumber67891011K0.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A4−2.57E−03−1.61E−021.78E−023.64E−02−1.95E−02−6.88E−03A6−1.65E−032.26E−039.80E−031.33E−023.22E−034.34E−04A8−7.43E−05−1.68E−03−2.71E−03−2.31E−038.24E−05−1.93E−04A101.93E−053.23E−045.11E−042.72E−04−1.88E−04−1.22E−05A120.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A140.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A160.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A180.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A200.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00

According to the information of the various parameters provided as above, the following data can be derived.

Third Embodimentf (mm)17.50TTL/|f1|2.53FNO4.9(f2 + f3)/CT2−575.32FOV (degree)16.95f23/f−0.78TTL (mm)18.94R2/f10.87FNO*L17.54BFL (mm)14.91(ΣET*EPD)/f2.14TTL/SL3157.33f1/CT17.21ΣET(len)/TTL0.15TTL/|f|1.08ET12/f0.07TTL/Imgh7.23

Fourth Embodiment

Referring to the fourth embodiment shown inFIG.7, the imaging lens100includes, successively in order from the object side to the image side, a stop STO, a first lens L1 having a negative refractive power, a second lens L2 having a positive refractive power, a third lens L3 having a negative refractive power, and an infrared cut-off filter L4.

In some embodiments, the imaging lens100further includes a prism arranged on an object side of the first lens L1. In addition,FIG.8is a graph showing longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens100according to the fourth embodiment, where the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

An object side surface S1 of the first lens L1 is convex at an optical axis, an image side surface S2 of the first lens L1 is concave at the optical axis. The object side S1 of the first lens L1 is convex at its circumference, and the image side surface S2 of the first lens L1 is concave at its circumference. An object side surface S3 of the second lens L2 is convex at the optical axis, an image side surface S4 of the second lens L2 is convex at the optical axis. The object side surface S3 of the second lens L2 is convex at its circumference, and the image side surface S4 of the second lens L2 is convex at its circumference. An object side surface S5 of the third lens L3 is convex at the optical axis, an image side surface S6 of the third lens L3 is concave at the optical axis. The object side surface S5 of the third lens L3 is convex at its circumference, and the image side surface S6 of the third lens L3 is concave at its circumference.

The object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical.

In addition, the first lens L1, the second lens L2 and the third lens L3 are all made of plastic.

In the fourth embodiment, the effective focal length of the imaging lens100is indicated by f, and f=17.45 mm. The f-number is indicated by FNO, and FNO=5.25. The angle of field of view is indicated by FOV, and FOV=16.57 degrees (deg.). The distance from the object side surface S1 of the first lens L1 to the imaging surface S9 on the optical axis is indicated by TTL, and TTL=17.69 mm.

In addition, various parameters of the optical system100are shown in Table 7 and Table 8. Definitions of the various parameters can be obtained from the first embodiment, and which will not be repeated herein.

TABLE 7Fourth Embodimentf = 17.45 mm, FNO = 5.25, FOV = 16.57 degrees, TTL = 17.69 mmThick-FocalSurfaceSurfaceSurfaceY radiusnessRefractiveAbbeLengthNumberNameShape(mm)(mm)Materialindexnumber(mm)0Object SurfaceSphericalInfinite10001Virtual SurfaceSphericalInfinite5.002Prism SurfaceSphericalInfinite2.50Glass1.5264.17Infinite3Prism SurfaceSphericalInfinite−2.504Prism SurfaceSphericalInfinite−0.855StopSphericalInfinite−0.046First LensAspherical−9.11−0.56Plastic1.6423.53−20.627Aspherical−5.27−0.048Second LensAspherical−5.12−2.93Plastic1.5555.976.379Aspherical8.66−0.0310Third LensAspherical−4.28−0.94Plastic1.5555.97−12.6711Aspherical−2.44−1.2112InfraredSphericalInfinite−0.21Glass13Cut-offSphericalInfinite−10.77Filter14Imaging SurfaceSphericalInfinite−1.00Note:the reference wavelength is 555 nm

TABLE 7Fourth EmbodimentAspheric CoefficientSurfaceNumber67891011K0.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A44.05E−04−1.67E−02−1.87E−02−9.01E−03−5.17E−031.09E−02A63.16E−042.44E−022.81E−028.72E−036.24E−03−4.29E−03A87.04E−04−8.62E−03−1.08E−02−5.30E−03−3.91E−034.55E−03A10−6.80E−04−1.26E−03−6.29E−041.50E−039.00E−04−2.93E−03A122.32E−041.20E−031.07E−03−1.43E−044.37E−051.14E−03A14−2.74E−05−1.64E−04−1.48E−046.13E−07−1.71E−05−1.54E−04A160.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A180.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A200.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00

According to the information of the various parameters provided as above, the following data can be derived

Fourth Embodimentf (mm)17.45TTL/|f1|0.86FNO5.25(f2 + f3)/CT2−2.15FOV (degree)16.57f23/f0.50TTL (mm)17.69R2/f10.26FNO*L17.75BFL (mm)12.67(ΣET*EPD)/f1.09TTL/SL92.56f1/CT1−36.82ΣET(len)/TTL0.24TTL/|f|1.01ET12/f0.18TTL/Imgh6.75

Fifth Embodiment

Referring to the fifth embodiment shown inFIG.9, the imaging lens100includes, successively in order from the object side to the image side, a stop STO, a first lens L1 having a negative refractive power, a second lens L2 having a positive refractive power, a third lens L3 having a positive refractive power, and an infrared cut-off filter L4. In some embodiments, the imaging lens100further includes a prism arranged on an object side of the first lens L1. In addition,FIG.10is a graph showing longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens100according to the fifth embodiment, where the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength.

An object side surface S1 of the first lens L1 is convex at an optical axis, an image side surface S2 of the first lens L1 is concave at the optical axis. The object side S1 of the first lens L1 is convex at its circumference, and the image side surface S2 of the first lens L1 is concave at its circumference. An object side surface S3 of the second lens L2 is convex at the optical axis, an image side surface S4 of the second lens L2 is concave at the optical axis. The object side surface S3 of the second lens L2 is convex at its circumference, and the image side surface S4 of the second lens L2 is convex at its circumference. An object side surface S5 of the third lens L3 is convex at the optical axis, an image side surface S6 of the third lens L3 is concave at the optical axis. The object side surface S5 of the third lens L3 is convex at its circumference, and the image side surface S6 of the third lens L3 is concave at its circumference.

The object side surfaces and the image side surfaces of the first lens L1, the second lens L2, and the third lens L3 are all aspherical.

In addition, the first lens L1, the second lens L2 and the third lens L3 are all made of plastic.

In the fifth embodiment, the effective focal length of the imaging lens100is indicated by f, and f=17.40 mm. The f-number is indicated by FNO, and FNO=5.25. The angle of field of view is indicated by FOV, and FOV=16.62 degrees (deg.). The distance from the object side surface S1 of the first lens L1 to the imaging surface S9 on the optical axis is indicated by TTL, and TTL=17.67 mm.

In addition, various parameters of the optical system100are shown in Table 9 and Table 10. Definitions of the various parameters can be obtained from the first embodiment, and which will not be repeated herein.

TABLE 9Fifth Embodimentf = 17.40 mm, FNO = 5.25, FOV = 16.62 degrees, TTL = 17.67 mmThick-FocalSurfaceSurfaceSurfaceY radiusnessRefractiveAbbeLengthNumberNameShape(mm)(mm)Materialindexnumber(mm)0Object SurfaceSphericalInfinite1000.001Virtual SurfaceSphericalInfinite5.002Prism SurfaceSphericalInfinite2.50Glass1.5264.17Infinite3Prism SurfaceSphericalInfinite−2.504Prism SurfaceSphericalInfinite−0.855StopSphericalInfinite−0.046First LensAspherical−8.18−0.66Plastic1.6423.53−20.397Aspherical−4.88−0.048Second LensAspherical−5.01−2.87Plastic1.5555.9710.639Aspherical−29.35−0.0310Third LensAspherical−2.60−0.90Plastic1.5555.9774.0111Aspherical−2.44−1.2112InfraredSphericalInfinite−0.21Glass13Cut-offSphericalInfinite−10.75Filter14Imaging SurfaceSphericalInfinite−1.00Note:the reference wavelength is 555 nm

TABLE 10Fifth EmbodimentAspheric CoefficientSurfaceNumber67891011K0.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A43.00E−03−1.30E−02−2.02E−02−3.64E−03−4.06E−03−5.38E−03A64.49E−042.45E−022.78E−028.84E−038.43E−03−2.27E−03A87.04E−04−8.65E−03−1.09E−02−5.28E−03−3.74E−035.74E−03A10−7.15E−04−1.32E−03−5.59E−041.56E−031.18E−03−3.40E−03A122.32E−041.23E−031.08E−03−1.33E−04−7.90E−051.38E−03A14−2.63E−05−1.69E−04−1.53E−04−2.65E−066.77E−06−2.00E−04A160.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A180.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00A200.00E+000.00E+000.00E+000.00E+000.00E+000.00E+00

According to the information of the various parameters provided as above, the following data can be derived.

Fifth Embodimentf (mm)17.40TTL/|f1|0.87FNO5.25(f2 + f3)/CT229.53FOV (degree)16.62f23/f0.49TTL (mm)17.67R2/f10.24FNO*L17.65BFL (mm)12.61(ΣET*EPD)/f1.09TTL/SL93.43f1/CT1−30.99ΣET(len)/TTL0.24TTL/|f|1.02ET12/f0.19TTL/Imgh6.75

Referring toFIG.11, an imaging lens100and a photosensitive element200are assembled to form a camera module10. The photosensitive element200is arranged on the image side of the imaging lens100. Preferably, the photosensitive element200is arranged on the imaging surface S9. The photosensitive element200may be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). It should be noted that, in some embodiments, the imaging lens100does not include an infrared cut-off filter L4. As such, the infrared cut-off filter L4 can be fixedly arranged with the photosensitive element200, and is arranged on the image side of the imaging lens100together with the photosensitive element200during assembly.

In some embodiments, a distance between the photosensitive element200and the imaging lens100is fixed. As such, the camera module10is a fixed focus module. In other embodiments, a voice coil motor is provided to enable the photosensitive element210to move relative to the lenses in the imaging lens100. In other embodiments, a fixing member can also be provided to fix the stop STO, the first lens L1, the second lens L2, and the third lens L3. In this case, a voice coil motor is provided on the fixing member to drive the above lenses and the stop STO to move relative to the photosensitive element200, thereby achieving the focusing.

Referring toFIGS.11and12, It should be noted that, according to actual manufacture requirements, in some embodiments, the camera module10is not provided with a reflector120(such as a prism or a flat reflector). As such, the light carrying the information of the subject directly enters the lens group (the first lens L1, the second lens L2, and the third lens L3). In other embodiments, the camera module10may be provided with a reflector120. As such, the light carrying the information of the subject is reflected by the reflector120and then enters the lens group.

In some embodiments, the reflector120and the lens group can be assembled to form the imaging lens100. The positions of the reflector120and the lenses can be corrected during assembly. Therefore, during the subsequent assembly of the imaging lens100and the photosensitive element200, it is possible to avoid correcting the positional relationship between the reflector120and the lens group, thereby reducing the difficulty of subsequent assembly.

In some embodiments, the imaging lens100does not include the reflector120. As such, the reflector120may be mounted on the object side of the first lens L1 when the imaging lens100and the photosensitive element200are assembled. The reflector120reflects the light carrying the information of the subject into the lens group.

Referring toFIG.13, the camera module10may be applied to an electronic device20. Specifically, the electronic device20is a smart phone, a tablet computer, an electronic watch, a Personal Digital Assistant (PDA), a game console, a personal computer (PC), and the like. By adopting the camera module10, the electronic device20not only possesses the telephoto characteristics, but also has the amount of light that is compatible with the focal length range, so as to improve the dark picture imaged by the conventional telephoto lens, and improve the imaging quality during telephoto capturing. Therefore, the electronic device20has excellent telephoto camera performance. In some embodiments, by providing the reflector, the electronic device20will further have the function of periscope capturing.

The “electronic device” used in the embodiments of the present disclosure may include, but is not limited to, a device configured to be connected via a wired line connection (such as via a public switched telephone network (PSTN), digital subscriber line (DSL), digital cable, direct cable connection, and/or another data connection/network) and/or receive/transmit communication signals via an wireless interface (for example, for a cellular network, a wireless local area network (WLAN), a digital TV network such as digital video broadcasting handheld (DVB-H) network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or another communication terminal). The electronic device configured to communicate via the wireless interface may be referred to as a “wireless communication terminal”, a “wireless terminal” and/or a “mobile terminal”. Examples of the mobile terminal include, but is not limited to satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities. Examples of the mobile terminal can include the radio phone, the pager, the Internet/intranet access, the Web browser, the memo pad, calendar, and/or a personal digital assistant (PDA) of the global positioning system (GPS) receiver; and conventional laptop and/or handheld receiver or other electronic device including a radio phone transceiver.

In the description of the present disclosure, it should be understood that orientation or positional conditions indicated by terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” etc. are based on orientation or positional relationship shown in the drawings, which are merely to facilitate the description of the present disclosure and simplify the description, not to indicate or imply that the device or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as a limitation on the present disclosure.

In addition, the terms “first” and “second” are used for description only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined with “first” and “second” may include at least one of the features explicitly or implicitly. In the description of the present disclosure, the meaning of “plurality” is at least two, for example, two, three or the like, unless explicitly and specifically defined otherwise.

In the present disclosure, unless explicitly specified and defined otherwise, terms “mounting”, “connecting”, “connected”, and “fixing” should be understood in a broad sense. For example, it may be a fixed connection or a detachable connection, or an integration; may be a mechanical connection or electrical connection; may be a direct connection, or may be a connection through an intermediate medium, may be the communication between two elements or the interaction condition between two elements, unless explicitly defined otherwise. The specific meanings of the above terms in the present disclosure can be understood by one of those ordinary skills in the art according to specific circumstances.

In the present disclosure, unless expressly specified and defined otherwise, a first feature being “on” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or may mean that the first feature is indirectly contact with the second feature through an intermediate medium. Moreover, the first feature being “above”, “top” and “upside” on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply mean that the level of the first feature is higher than that of the second feature. The first feature being “below”, “under” and “beneath” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply mean that the level of the first feature is smaller than that of the second feature.

In the description of this specification, descriptions referring to terms “one embodiment”, “some embodiments”, “examples”, “specific examples”, or “some examples” and the like mean that specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, if there is no contradiction, the different embodiments or examples and the features of the different embodiments or examples described in this specification can be combined and incorporated by those skilled in the art.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to simply the description, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combinations of these technical features, they should be considered to be fallen into the range described in the present specification.

Only several embodiments of the present disclosure are illustrated in the above-mentioned embodiments, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can be made, which all fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the appended claims.