TWI716641B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged on an optical axis in order from an object side to an image side. The first lens is a meniscus lens having a positive refractive power. The second lens is a lens having a positive refractive power, and has an object-side surface being convex. The third lens is a lens having a negative refractive power, and has an object-side surface being concave. The fourth lens is a meniscus lens having a negative refractive power. The fifth lens is a lens having a positive refractive power, and has an object-side surface being convex. The optical lens is characterized by a long focal length and small size.

Description

Imaging lens (22)

The invention relates to an imaging lens, in particular to an imaging lens with a long focal length and a total length of the lens.

At present, most electronic products equipped with imaging lenses on the market are based on the requirements of wide viewing angle and close-to-object distance characteristics. If you want to clearly capture subtle images in the distance, the optical design of this type of lens cannot meet this demand. The imaging lens that can achieve telephoto shooting generally adopts a multi-group zoom design and is equipped with a spherical lens. This structure makes the lens too bulky and is not conducive to miniaturization. Therefore, the conventional optical system can no longer meet the photographing needs of general consumers seeking functionality and convenience.

The object of the present invention is to provide an imaging lens, which has the characteristics of a long focal length, a total length of the lens, and good optical performance.

The imaging lens provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order from the object side to the image side on the optical axis. The first lens is a meniscus lens with positive refractive power; the second lens is a lens with positive refractive power, the object side surface of the second lens is convex; the third lens is a lens with negative refractive power, and the third lens The object side surface of the lens is a concave surface; the fourth lens is a meniscus lens with negative refractive power: the fifth lens is a lens with positive refractive power, and the object side surface of the fifth lens is convex.

<1 其中TTL為該成像鏡頭總長(以毫米為單位)，EFL為該成像鏡頭的有效焦距(以毫米為單位)。 The imaging lens satisfies the following conditional formula: 0<

<1 Where TTL is the total length of the imaging lens (in millimeters), and EFL is the effective focal length of the imaging lens (in millimeters).

<1 其中TTL為該成像鏡頭總長(以毫米為單位)，BFL為該第五透鏡之像側表面至成像面於光軸上之距離(以毫米為單位)。 The imaging lens further satisfies the following conditional formula: 0.2<

<1 Where TTL is the total length of the imaging lens (in millimeters), and BFL is the distance from the image side surface of the fifth lens to the imaging surface on the optical axis (in millimeters).

<1 其中f1為該第一透鏡的焦距(以毫米為單位)，EFL為該成像鏡頭的有效焦距(以毫米為單位)。 The imaging lens further satisfies the following conditional formula: 0.2<

<1 Where f1 is the focal length of the first lens (in millimeters), and EFL is the effective focal length of the imaging lens (in millimeters).

<3.0 其中ν 1為該第一透鏡的阿貝係數(Abbe number)，ν 5為該第五透鏡的阿貝係數。 The imaging lens further satisfies the following conditional formula: 2.0<

<3.0 where ν 1 is the Abbe number of the first lens, and ν 5 is the Abbe number of the fifth lens.

The object side surface of the second lens is convex, the image side surface of the fourth lens is convex, and the image side surface of the fifth lens is convex.

The image side surface of the second lens is concave, the image side surface of the fourth lens is concave, and the image side surface of the fifth lens is concave.

The image-side surface of the third lens and the object-side surface of the fourth lens are opposite concave surfaces.

Wherein, at least one surface of each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is an aspheric surface.

The imaging lens further includes: a filter arranged between the fifth lens and an imaging plane.

The imaging lens further includes: an aperture set between the object side and the second lens.

<1，其中TTL為該成像鏡頭總長(以毫米為單 位)，EFL為該成像鏡頭的有效焦距(以毫米為單位)。 In another embodiment of the imaging lens of the present invention, it includes in order from the object side to the image side on the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens . The first lens is a meniscus lens with positive refractive power; the second lens is a lens with positive refractive power, the object side surface of the second lens is convex; the third lens is a lens with negative refractive power and the object side surface It is a concave surface; the fourth lens is a meniscus lens with negative refractive power: the fifth lens is a lens with positive refractive power, and the object side surface of the fifth lens is convex. The imaging lens satisfies the following conditional formula: 0<

<1, where TTL is the total length of the imaging lens (in millimeters), and EFL is the effective focal length of the imaging lens (in millimeters).

<1，其中f1為該第一透鏡的焦距(以毫米為單 位)，EFL為該成像鏡頭的有效焦距(以毫米為單位)。 In another embodiment of the imaging lens of the present invention, it includes in order from the object side to the image side on the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens . The first lens is a meniscus lens with positive refractive power; the second lens is a lens with positive refractive power, the object side surface of the second lens is convex; the third lens is a lens with negative refractive power and the object side surface It is a concave surface; the fourth lens is a meniscus lens with negative refractive power: the fifth lens is a lens with positive refractive power, the object side surface of the fifth lens is convex, and the imaging lens satisfies the following conditional formula: 0.2<

<1, where f1 is the focal length of the first lens (in millimeters), and EFL is the effective focal length of the imaging lens (in millimeters).

The imaging lens of the present invention has the characteristics of a long focal length, while having a telephoto function, it can reduce aberrations, improve the resolution, and can effectively control the total length of the lens to meet the needs of miniaturization.

IMA‧‧‧imaging plane

L1‧‧‧First lens

L2‧‧‧Second lens

L3‧‧‧third lens

L4‧‧‧Fourth lens

L5‧‧‧Fifth lens

OA‧‧‧Optical axis

OF‧‧‧Filter

S1~S13‧‧‧surface

ST‧‧‧Aperture

Figure 1 shows a schematic diagram of an imaging lens according to a first embodiment of the present invention.

Figures 2A to 2D are respectively the longitudinal aberration, lateral chromatic aberration, curvature of field and distortion, and modulation transfer function diagrams of the first embodiment in sequence.

FIG. 3 shows a schematic diagram of an imaging lens according to a second embodiment of the invention.

Figures 4A to 4D are respectively the longitudinal aberration, lateral chromatic aberration, curvature of field and distortion, and modulation transfer function diagrams of the second embodiment in sequence.

FIG. 5 shows a schematic diagram of an imaging lens according to a third embodiment of the invention.

Figures 6A to 6D are respectively the longitudinal aberration, lateral chromatic aberration, curvature of field and distortion, and modulation transfer function diagrams of the third embodiment in sequence.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The imaging lens provided by the present invention has the characteristics of miniature and long focal length, and can be applied to various lens-equipped imaging devices, such as personal information terminals (such as mobile phones, smart phones and tablet computers), wearable devices, surveillance equipment, IP CAM, driving recorder and reversing developing equipment, etc.

The basic structure of the imaging lens of the present invention is shown in Figure 1 (corresponding to the first embodiment), Figure 3 (corresponding to the second embodiment), and Figure 5 (corresponding to the third embodiment). As shown in Figures 1, 3, and 5, the imaging lens includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens in order from the object side to the image side along the optical axis OA. L4 and a fifth lens L5, the total number of lenses is five, in addition to the aperture ST between the object side and the second lens L2, and the filter OF between the fifth lens L5 and the imaging plane IMA.

The first lens L1 is a meniscus lens with positive refractive power. Its object-side surface S2 is convex and its image-side surface S3 is concave. The curvature of the object-side surface S2 of the first lens L1 is greater than that of the image-side surface S3. This shortens the total length of the imaging lens. The two surfaces S2 and S3 can both be aspherical surfaces, and the aberration can be corrected.

The second lens L2 is a convex lens with positive refractive power. The object side surface S4 is convex, and the image side surface S5 may be slightly convex or concave, or a flat surface. The object side surface S4 of the second lens L2 is convex toward the object end from the center, and the degree of convexity decreases along both sides, and the degree of convexity increases slightly at the two ends away from the optical axis. The two surfaces S4 and S5 of the second lens L2 may both be aspherical surfaces.

The third lens L3 is a lens with negative refractive power, the image side surface S7 is concave, the object side surface S6 has a relatively small curvature, and at least one surface of the third lens L3 is an aspheric surface.

The fourth lens L4 is a lens with negative refractive power, the object side surface S8 is concave, the image side surface S9 has a relatively small curvature, and at least one surface of the fourth lens L4 is an aspheric surface. The image side surface S7 of the third lens L3 and the object side surface S8 of the fourth lens L4 are opposite concave surfaces.

The fifth lens L5 is a lens with positive refractive power, and its object side surface S10 and image side surface S11 may both be aspherical. The object side surface S10 of the fifth lens L5 is a convex surface, and the image side surface S11 may be a convex surface or a concave surface near the optical axis.

The first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5 of the imaging lens can all be made of plastic material, and the object side surface and image side surface of each lens can be both Aspheric surface.

Herein, unless otherwise stated, the object-side surface and the image-side surface of the lens refer to the object-side surface and the image-side surface at the near optical axis.

其中TTL為該成像鏡頭總長，即第一透鏡L1的物側表面S2至成像平面IMA於光軸上的距離，EFL為該成像鏡頭的有效焦距。藉此，可有效控制該成像鏡頭的總長度，維持其小型化。 The length of the imaging lens of the present invention satisfies the following mathematical formula (1):

Wherein TTL is the total length of the imaging lens, that is, the distance from the object side surface S2 of the first lens L1 to the imaging plane IMA on the optical axis, and EFL is the effective focal length of the imaging lens. In this way, the total length of the imaging lens can be effectively controlled to maintain its miniaturization.

其中BFL為第五透鏡L5之像側表面S11至成像平面IMA於光軸OA上之一間距。 Further, the imaging lens of the present invention also satisfies the following mathematical formula (2):

Where BFL is a distance from the image side surface S11 of the fifth lens L5 to the imaging plane IMA on the optical axis OA.

Furthermore, in order for the imaging lens of the present invention to maintain good optical performance, the imaging lens satisfies the following condition (3).

其中f1為第一透鏡L1的焦距。也就是說，第一透鏡L1的焦距與該成像鏡 頭的有效焦距EFL之比值的絕對值介於0.2至1之間。

Where f1 is the focal length of the first lens L1. In other words, the absolute value of the ratio of the focal length of the first lens L1 to the effective focal length EFL of the imaging lens is between 0.2 and 1.

The imaging lens can further satisfy the following condition (4) to further maintain optical performance.

其中ν 1為第一透鏡L1的阿貝係數(Abbe number)，ν 5為第五透鏡的阿貝係數。

Where ν 1 is the Abbe number of the first lens L1, and ν 5 is the Abbe number of the fifth lens.

When the imaging lens satisfies at least one of the above conditional expressions (1) to (4), the total length of the lens can be effectively reduced and aberrations corrected, and the resolution of the lens can also be effectively improved.

The imaging lens of the present invention has the characteristics of a long focal length, while having a telephoto function, it can reduce aberrations, improve the resolution, and can effectively control the total length of the lens to meet the needs of miniaturization.

Three specific embodiments will be given below to further describe the imaging lens of the present invention in detail. Please refer to Fig. 1, Fig. 3 and Fig. 5, which correspond to the first, second and third embodiments of the present invention, respectively. The lens composition of the embodiment.

其中D代表非球面透鏡在離透鏡中心軸的相對高度時的矢(Sag)量，C表示近軸曲率半徑倒數，H表示非球面透鏡在離透鏡中心軸的相對高度，K表示非球面透鏡的圓錐常數(Conic Constant)，而E ₄ ~E ₁₆ 四階以上之偶數階的非球面修正係數。 The shape of the aspheric lens can be expressed by the following formula:

Where D represents the sag of the aspheric lens relative to the height from the central axis of the lens, C represents the reciprocal of the paraxial curvature radius, H represents the relative height of the aspheric lens from the central axis of the lens, and K represents the relative height of the aspheric lens Conic Constant, and E ₄ ~ E _{16 are} even-numbered aspheric correction coefficients above the fourth order.

The first embodiment:

Please refer to Figure 1 and Figures 2A to 2D. Figure 1 shows a schematic diagram of an imaging lens according to the first embodiment of the present invention. Figures 2A to 2D are respectively the longitudinal aberration and the lateral aberration of the first embodiment in sequence. Chromatic aberration, curvature of field and distortion, and modulation transfer function graph. In the first embodiment, the imaging lens sequentially includes the first lens L1 to the fifth lens L5 on the optical axis from the object side to the image side. The first lens L1 is a meniscus lens, the object-side surface S2 is a convex surface, and the image-side surface S3 is a concave surface with positive refractive power. The second lens L2 is a convex lens, the object side surface S4 is a convex surface, and the image side surface S5 is a convex surface with positive refractive power. The image-side surface S7 of the third lens L3 and the object-side surface S8 of the fourth lens L4 are opposite concave surfaces, the object-side surface S6 of the third lens L3 is concave, and the image-side surface S9 of the fourth lens is convex. Both the lens L3 and the fourth lens L4 have negative refractive power. The object-side surface S10 and the image-side surface S11 of the fifth lens L5 are both convex and have positive refractive power. In this embodiment, the image side surfaces of the second lens L2, the fourth lens L4, and the fifth lens L5 are all convex surfaces.

Table 1 is the related parameter table of each lens of the imaging lens in Figure 1. The effective focal length (EFL) of the imaging lens is 11.0mm, the aperture value (F-number) is 2.75, and the total length of the lens is 9.0mm.

Table 2 is a table of related parameters of the aspheric surface of each lens in Table 1.

The imaging lens of this embodiment has a total lens length of 9.0mm, an effective focal length of 11.0mm, BFL of 3.05mm, TTL/EFL of 0.818mm, greater than 0 and less than 1, BFL/TTL of 0.339mm, greater than 0.2 and less than 1, meeting the above requirements Conditional expressions (1) and (2). The effective focal length f ₁ of the first lens L1 is 6.368 mm, and the absolute value of f ₁ /EFL is 0.579 mm, which is between 0.2 and 1, which satisfies the above conditional formula (3). The Abbe coefficient ν 1 of the first lens L1 is 56.96, and the Abbe coefficient ν 5 of the fifth lens L5 is 23.53. The absolute value of the ratio between the two is 2.421, which is between 2 and 3, which satisfies the above conditional formula (4) .

<1，符合該範圍則具有最佳鏡頭小型化之條件。 Among them, if the value of condition (1) TTL/EFL is greater than 1, it is difficult to achieve the goal of miniaturization of the lens. Therefore, the value of TTL/EFL must be at least less than 1, so the best effect range is 0<

<1, meeting this range will have the best lens miniaturization conditions.

The second embodiment:

Please refer to Fig. 3 and Figs. 4A to 4D. Fig. 3 shows a schematic diagram of an imaging lens according to the second embodiment of the present invention. Figs. 4A to 4D are the longitudinal aberrations and lateral aberrations of the second embodiment respectively. Chromatic aberration, curvature of field and distortion, and modulation transfer function graph. In the second embodiment, the imaging lens includes the first lens L1 to the fifth lens L5 in order from the object side to the image side on the optical axis. The first lens L1 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface with positive refractive power. The second lens L2 is a convex lens, the object side surface S4 is convex, and the image side surface S5 is convex, with positive refractive power. The image-side surface S7 of the third lens L3 and the object-side surface S8 of the fourth lens L4 are opposite concave surfaces, the object-side surface S6 of the third lens L3 is concave, and the image-side surface S9 of the fourth lens is convex. Both the lens L3 and the fourth lens L4 have negative refractive power. Both the object side surface S10 and the image side surface S11 of the fifth lens L5 are convex and have positive refractive power. In this embodiment, the image side surfaces of the second lens L2, the fourth lens L4, and the fifth lens L5 are all convex.

Table 3 is the relevant parameter table of each lens of the imaging lens in Figure 3. The effective focal length (EFL) of the imaging lens is 8.0mm, the aperture value (F-number) is 2.72, and the total lens length is 6.534mm.

Table 4 is a table of relevant parameters of the aspheric surface of each lens in Table 3.

The imaging lens of this embodiment has a total lens length of 6.534mm, an effective focal length of 8.0mm, BFL of 2.206mm, TTL/EFL of 0.817mm, greater than 0 and less than 1, BFL/TTL of 0.338mm, greater than 0.2 and less than 1, meeting the above requirements Conditional expressions (1) and (2). The effective focal length f ₁ of the first lens L1 is 4.633 mm, and the absolute value of f ₁ /EFL is 0.579 mm, which is between 0.2 and 1, which satisfies the above conditional formula (3). The Abbe's coefficient of the first lens L1 is 56.96, and the Abbe's coefficient of the fifth lens L5 is 23.53. The absolute value of the ratio between the two is 2.421, which is between 2 and 3, and satisfies the above condition (4 ).

<1，符合該範圍則具有最佳鏡頭小型化之條件。 Among them, if the value of condition (2) BFL/TTL is less than 0.2, it is difficult to maintain the objective of miniaturization of the lens. Therefore, the value of BFL/EFL must be at least greater than 0.2, so the best effect range is 0.2<

<1, meeting this range will have the best lens miniaturization conditions.

The third embodiment:

Please refer to Fig. 5 and Figs. 6A to 6D. Fig. 5 shows a schematic diagram of an imaging lens according to the third embodiment of the present invention. Figs. 6A to 6D are respectively the longitudinal aberration and lateral aberration of the third embodiment in sequence. Chromatic aberration, curvature of field and distortion, and modulation transfer function graph. In the third embodiment, the imaging lens sequentially includes the first lens L1 to the fifth lens L5 on the optical axis from the object side to the image side. The first lens L1 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface with positive refractive power. The second lens L2 is a convex lens, the object side surface S4 is a convex surface, and the image side surface S5 is a concave surface, and has a positive refractive power. The image-side surface S7 of the third lens L3 and the object-side surface S8 of the fourth lens L4 are opposite concave surfaces, the object-side surface S6 of the third lens L3 is concave, and the image-side surface S9 of the fourth lens is concave. Both the lens L3 and the fourth lens L4 have negative refractive power. The object side surface S10 of the fifth lens L5 is a convex surface, and the image side surface S11 is a concave surface and has a positive refractive power. In this embodiment, the image side surfaces of the second lens L2, the fourth lens L4, and the fifth lens L5 are all concave.

Table 5 is the related parameter table of each lens of the imaging lens in Figure 5. The effective focal length (EFL) of the imaging lens is 11.0mm, the aperture value (F-number) is 2.70, and the total length of the lens is 9.0mm.

Table 6 is a table of relevant parameters of the aspheric surface of each lens in Table 5.

The imaging lens of this embodiment has a total lens length of 9.0mm, an effective focal length of 11.0mm, a BFL of 3.092mm, a TTL/EFL of 0.818mm, greater than 0 and less than 1, and a BFL/TTL of 0.344mm, greater than 0.2, satisfying the above conditional formula (1) and (2). The effective focal length f ₁ of the first lens L1 is 6.942 mm, and the absolute value of f ₁ /EFL is 0.631 mm, which is between 0.2 and 1, which satisfies the above conditional formula (3). The Abbe coefficient ν 1 of the first lens L1 is 55.95, and the Abbe coefficient ν 5 of the fifth lens L5 is 23.97. The absolute value of the ratio between the two is 2.334, which is between 2 and 3, which satisfies the above conditional formula (4) .

<1，符合該範圍則可提供足夠強的屈光度。 Among them, if the absolute value of condition (3) f ₁ /EFL is greater than 1, it is difficult to provide a sufficiently strong diopter. Therefore, the absolute value of f ₁ /EFL must be at least less than 1, so the best effect range is 0.2<

<1, meeting this range can provide sufficient diopter.

<3，符合該範圍則具有最作消色差條件。 Among them, if the absolute value of the condition (4) ν 1/ν 5 is less than 2, the achromatic function is poor. Therefore, the absolute value of ν 1/ν 5 must be at least greater than 2, so the best effect range is 2<

<3, meeting this range has the most achromatic condition.

<1、0.2<

<1、0.2<

<1及2<

<3為中心，本發明實施例的數值也落入其餘公式的範 圍內。公式0<

<1及0.2<

<1，可助於鏡頭達到小型化。公式 0.2<

<1，可提供足夠強的屈光度。公式2<

<3，可使消色差表 現較佳。 The formula according to the present invention is 0<

<1、0.2<

<1、0.2<

<1 and 2<

<3 is the center, and the numerical value of the embodiment of the present invention also falls within the range of other formulas. Formula 0<

<1 and 0.2<

<1, can help the lens to achieve miniaturization. Formula 0.2<

<1, can provide enough strong diopter. Formula 2<

<3, can make achromatic performance better.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Retouching, therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

IMA‧‧‧imaging plane

L1‧‧‧First lens

L2‧‧‧Second lens

L3‧‧‧third lens

L4‧‧‧Fourth lens

L5‧‧‧Fifth lens

OA‧‧‧Optical axis

OF‧‧‧Filter

S1~S13‧‧‧surface

ST‧‧‧Aperture

Claims (10)

An imaging lens, which sequentially includes on the optical axis from the object side to the image side: a first lens, which is a meniscus lens with positive refractive power, and a second lens, which is a lens with positive refractive power. The object side surface of the two lenses is convex; the third lens is a lens with negative refractive power, and the object side surface of the third lens is concave; and the fourth lens is a meniscus lens with negative refractive power. The object-side surface of the fourth lens is concave, and the image-side surface of the fourth lens is convex; and a fifth lens, which is a lens with positive refractive power, and the object-side surface of the fifth lens is convex; wherein the imaging lens Meet the following conditions: 0<

<1, where TTL is the total length of the imaging lens, and EFL is the effective focal length of the imaging lens. An imaging lens, which sequentially includes on the optical axis from the object side to the image side: a first lens, which is a meniscus lens with positive refractive power, and a second lens, which is a lens with positive refractive power. The object-side surface of the two lenses is convex; a third lens is a lens with negative refractive power, and the object-side surface of the third lens is concave; a fourth lens is a meniscus lens with negative refractive power; and A fifth lens, which is a lens with positive refractive power, and the object side surface of the fifth lens is convex; wherein the imaging lens satisfies the following conditional formula: 0.2<

<1, where TTL is the total length of the imaging lens, and BFL is the distance from the image side surface of the fifth lens to an imaging plane on the optical axis. An imaging lens, which sequentially includes on the optical axis from the object side to the image side: a first lens, which is a meniscus lens with positive refractive power, and a second lens, which is a lens with positive refractive power. The object-side surface of the two lenses is convex; a third lens is a lens with negative refractive power, and the object-side surface of the third lens is concave; a fourth lens is a meniscus lens with negative refractive power; and A fifth lens, which is a lens with positive refractive power, the object side surface of the fifth lens is convex, the image side surface of the second lens is concave, the image side surface of the fourth lens is concave, and the fifth lens The image side surface of the lens is concave. Such as the imaging lens described in any one of items 1 to 3 in the scope of patent application, wherein the imaging lens further satisfies the following conditional formula: 2<

<3, where ν1 is the Abbe number of the first lens, and ν5 is the Abbe number of the fifth lens. According to the imaging lens described in item 1 or item 2 of the scope of patent application, the image side surface of the second lens is convex, and the image side surface of the fifth lens is convex. In the imaging lens described in item 2 of the scope of patent application, the image side surface of the second lens is concave, the image side surface of the fourth lens is concave, and the image side surface of the fifth lens is concave. The imaging lens according to any one of items 1 to 3 in the scope of patent application, wherein the image side surface of the third lens and the object side surface of the fourth lens are opposite concave surfaces. The imaging lens according to any one of items 1 to 3 in the scope of patent application, wherein each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is at least One side is an aspheric surface. For example, the imaging lens described in any one of items 1 to 3 in the scope of the patent application further includes: a filter arranged between the fifth lens and an imaging plane; and an aperture arranged on the object side and the first Between two lenses. Such as the imaging lens described in any one of items 1 to 3 in the scope of patent application, wherein the imaging lens further satisfies the following conditional formula: 0.2<

<1, where f1 is the focal length of the first lens, and EFL is the effective focal length of the imaging lens.

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