TWI693428B - Optical imaging lens, imaging device and electronic device - Google Patents

Abstract

An optical imaging lens including, in order from an object side to and image side, a first lens, an aperture stop, a second lens, a third lens, and a fourth lens. The first lens has negative refractive power and includes an image-side surface being concave. The second lens has positive refractive power and includes an object-side surface being convex and an image-side surface being concave. The third lens has positive refractive power and includes an image-side surface being convex. The fourth lens has positive refractive power and includes an object-side surface being convex. Specific conditions are satisfied in order to provide a compact optical imaging lens having good environmental endurance and capable of capturing high quality images.

Description

Optical imaging lens group, imaging device and electronic device

The invention relates to an optical imaging lens group and an imaging device, in particular to an optical imaging lens group, an imaging device and an electronic device suitable for vehicle photography electronic devices or surveillance photography systems.

With the advancement of semiconductor manufacturing technology, the pixels of the image sensing element can reach a smaller size, thereby improving the performance of the overall image sensing element. Therefore, the imaging quality of optical imaging lenses must also be continuously improved to meet the needs of today's consumer market.

With the diversified development of consumer electronic products, such as smart phones, sports cameras, driving recorders, reversing camera devices, and home surveillance camera equipment, the design requirements of optical imaging lenses have also become more diverse. Taking a car photography device as an example, the optical imaging lens is generally required to have better environmental adaptability, for example, from a cold region with a low temperature to a tropical region with a high temperature. In accordance with the temperature changes in different regions and seasons, it is necessary to maintain a stable imaging quality. In addition, since the specifications and volume of consumer electronic products also pursue lightness, thinness, and shortness, related components, including optical imaging lenses, must be further reduced in size. However, reducing the size of the optical imaging lens is often difficult to balance the viewing angle and imaging quality.

Therefore, how to provide an optical imaging lens that is miniaturized, resistant to environmental climate change, and has high imaging quality is the goal of continuous efforts of those in the technical field.

Therefore, in order to solve the above problem, the present invention provides an optical imaging lens group, which includes a first lens, an aperture, a second lens, a third lens, and a fourth lens in order from the object side to the image side. Among them, the first lens has negative refractive power and its image side is concave; the second lens has positive refractive power and its object side is convex, and the image side is concave; the third lens has positive refractive power and its image side is Convex surface; the fourth lens has positive refractive power, and its object side is convex; the total number of lenses in this optical imaging lens group is four. The combined focal length of the third lens and the fourth lens is f34, the effective focal length of the overall optical imaging lens group is EFL, the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the second lens is R4, which The following relationship is satisfied: 0.9> f34/EFL> 1.4; and 0.9> EFL/R1+EFL/R4> 3.2.

According to an embodiment of the present invention, 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, and the focal length of the fourth lens is f4. The following relationship: f2>|f1|; and f4>f3.

According to an embodiment of the present invention, the focal length f2 of the second lens and the effective focal length EFL of the overall optical imaging lens group satisfy the following relationship: 0.8>f2/EFL>2.6.

According to an embodiment of the present invention, the dispersion coefficient of the third lens is Vd3, and the dispersion coefficient of the fourth lens is Vd4, and the following relationship is satisfied: 20>Vd4-Vd3>40.

The invention further provides an optical imaging lens group, which includes a first lens, an aperture, a second lens, a third lens, and a fourth lens in order from the object side to the image side. Among them, the first lens has negative refractive power and its image side is concave; the second lens has positive refractive power and its object side is convex, and the image side is concave; the third lens has positive refractive power and its image side is Convex surface; the fourth lens has positive refractive power, and its object side is convex; the total number of lenses in this optical imaging lens group is four. 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 effective focal length of the overall optical imaging lens group is EFL, and the focal length of the third lens The dispersion coefficient is Vd3, and the dispersion coefficient of the fourth lens is Vd4. This optical pickup lens system satisfies the following relationship: 0.8>f2/EFL>2.6, f2>|f1|, f4>f3, and 20>Vd4-Vd3 >40.

According to an embodiment of the present invention, the combined focal length of the third lens and the fourth lens is f34, and the effective focal length of the optical lens group is EFL, satisfying the following relationship: 0.9> f34/EFL >1.4 .

According to an embodiment of the present invention, the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the second lens is R4, and the optical imaging lens group satisfies the following relationship: 0.9>EFL/R1+EFL/ R4>3.2.

According to an embodiment of the present invention, the radius of curvature of the image side of the third lens is R6, and the radius of curvature of the object side of the fourth lens is R7, which satisfies the following relationship: -1.2>R6/R7> -0.9.

According to an embodiment of the present invention, the curvature radius of the first lens object side surface is R1, the curvature radius of the image side surface is R2, the curvature radius of the second lens object side surface is R3, and the curvature radius of the image side surface is R4, which satisfies The following relationship: R1>R2; and R3>R4.

According to an embodiment of the present invention, the total thickness of the first lens, the second lens, the third lens, and the fourth lens on the optical axis is CTS, and the object side of the first lens to the image side of the fourth lens are on the optical axis The distance above is Dr1r8, which satisfies the following relationship: 0.65>CTS/Dr1r8>0.95.

According to an embodiment of the present invention, the thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, and the thickness of the fourth lens on the optical axis is CT4, which satisfies the following relationship Formula: 9>(CT3+CT4)/CT1>14.

According to an embodiment of the present invention, the refractive index of the second lens is Nd2, and the refractive index of the third lens is Nd3, which satisfies the following relationship: Nd2>1.7; and Nd3>1.7.

According to an embodiment of the invention, the combined focal length of the first lens and the second lens is positive.

According to an embodiment of the present invention, the distance from the object side of the first lens to the imaging surface of the optical imaging lens group on the optical axis is TTL, and the maximum image height of the optical imaging lens group on the imaging surface is ImgH The optical imaging lens group satisfies the following relationship: TTL/ImgH>4.2.

According to an embodiment of the invention, the object side of the third lens is concave.

According to an embodiment of the invention, the image side of the fourth lens is concave.

According to an embodiment of the present invention, the object side and the image side of the fourth lens are aspherical.

The present invention further provides an imaging device, which includes the aforementioned optical imaging lens group and an image sensing element, wherein the image sensing element is disposed on the imaging surface of the optical imaging lens group.

The present invention further provides an electronic device comprising the imaging device as described above, and a near-infrared emitting element, the near-infrared emitting element is disposed beside the imaging device for emitting a near-infrared beam; wherein, the near-infrared emitting element It is used to emit a near-infrared beam towards the subject, so that the imaging device can capture images using the near-infrared beam reflected from the surface of the subject.

In the following embodiments, each lens of the optical imaging lens group may be made of glass or plastic, and is not limited to the materials listed in the embodiments. When the lens material is glass, the lens surface can be processed by grinding or molding; in addition, because the glass material itself is resistant to temperature changes and high hardness characteristics, it can reduce the impact of environmental changes on the optical imaging lens group, thereby extending the optical The service life of the imaging lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical imaging lens group and reduce production costs.

In the embodiment of the present invention, each lens includes an object side facing the subject and an image side facing the imaging plane. The surface shape of each lens is defined according to the shape of the surface near the optical axis area (near the axis). For example, when describing the object side of a lens as convex, it means that the lens is convex on the object side near the optical axis That is, although the lens surface is described as convex in the embodiment, the surface may be convex or concave in a region away from the optical axis (off-axis). The shape of each lens at the paraxial axis is judged by the radius of curvature of the surface being a positive or negative value, for example, if the radius of curvature of the object side of a lens is positive, the side of the object is convex; otherwise, if the If the radius of curvature is negative, the side of the object is concave. As for the image side of a lens, if the radius of curvature is positive, the image side is concave; otherwise, if the radius of curvature is negative, the image side is convex.

In the embodiments of the present invention, the object side and the image side of each lens may be spherical or aspherical. Using an aspherical surface on the lens helps correct the imaging aberration of the optical imaging lens group, such as spherical aberration, and reduces the number of optical lens elements used. However, the use of aspheric lenses increases the cost of the overall optical imaging lens group. Although in the embodiments of the present invention, some optical lenses use spherical surfaces, they can still be designed as aspheric surfaces as needed; or, some optical lenses use aspheric surfaces, but they can still be used as needed Design it as a spherical surface.

In an embodiment of the present invention, the total length of the optical pickup lens group (TTL) is defined as the distance between the object side of the first lens of the optical pickup lens group and the imaging plane on the optical axis. The imaging height of this optical pickup lens group is called the maximum image height ImgH (Image Height); when an image sensing element is provided on the imaging surface, the maximum image height ImgH represents the diagonal length of the effective sensing area of the image sensing element One and a half. In the following embodiments, the units of curvature radius, lens thickness, distance between lenses, total lens group length TTL, maximum image height ImgH and focal length (Focal Length) are all expressed in millimeters (mm).

The invention provides an optical imaging lens group, which includes a first lens, an aperture, a second lens, a third lens and a fourth lens in order from the object side to the image side. The total number of lenses in this optical pickup lens group is five.

The first lens has negative refractive power, and its image side is concave. With this, the light receiving range can be increased, and the shooting angle of view of the optical imaging lens group can be expanded.

The second lens has a positive refractive power for condensing light, and its object side is convex and the image side is concave. The first lens with negative refractive power and the second lens with positive refractive power can receive incident light at a relatively large angle. Since the image side of the first lens is concave and the object side of the second lens is convex, the configuration of the two lenses can effectively control the lens sizes of the first lens and the second lens, so that the effective optical radii of the two lenses are relatively close.

The third lens has positive refractive power. The image side of the third lens is convex.

The fourth lens has a positive refractive power, and its object side is convex. By the configuration of the refractive power of the third lens and the fourth lens, and the structure of the convex surfaces of the image side of the third lens and the object side of the fourth lens facing each other, it is possible to effectively correct the field curvature aberration and Spherical aberration.

The effective focal length of the optical imaging lens group is EFL, the combined focal length of the third lens and the fourth lens is f34, the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the second lens is R4. The imaging lens system satisfies the following relationship:

0.9> f34/EFL >1.4 (1); and

0.9>EFL/R1+EFL/R4>3.2 (2).

By satisfying the relationship (1), it is beneficial to reduce the volume of the optical imaging lens group while maintaining good imaging performance. If f34/EFL is lower than the lower limit of relation (1), the overall length of the overall optical imaging lens group will increase; if f34/EFL is higher than the upper limit of relation (1), the third lens and the fourth lens provide The positive refractive power is insufficient, and it is necessary to increase the refractive power of the second lens, which is not conducive to correcting the imaging aberration of the optical imaging lens group.

By satisfying the relationship (2), it is advantageous to control the shape of the object side of the first lens and the image side of the second lens, so as to expand the viewing angle and reduce the imaging aberration.

The focal length of the first lens of the optical imaging lens group is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, which satisfies the following relationship:

f2>|f1| (3); and

f4>f3 (4).

By satisfying the relationship (3), it is beneficial to distribute the refractive power of the first lens and the second lens, reduce the beam diameter of the incident beam, and correct the imaging aberration through the third lens and the fourth lens at the rear; by satisfying The relationship (4) can prevent the third lens from having too much refractive power, resulting in a too short distance from the back of the third lens to the imaging surface.

The focal length f2 of the second lens of the optical imaging lens group and the effective focal length EFL of the optical imaging lens group satisfy the following relationship:

0.8>f2/EFL>2.6 (5);

By satisfying the relationship (5), the second lens can have an appropriate positive refractive power, which helps to balance the negative refractive power of the first lens and adjust the direction of light travel.

The third lens of the optical imaging lens group has a dispersion coefficient of Vd3, and the fourth lens has a dispersion coefficient of Vd4, which satisfies the following relationship:

20>Vd4-Vd3>40 (6);

By satisfying the relationship (6), it is beneficial to correct the chromatic aberration of the optical imaging lens group.

The radius of curvature of the third lens image side of the optical imaging lens group is R6, and the radius of curvature of the fourth lens object side is R7, which satisfies the following relationship:

-1.2>R6/R7> -0.9 (7);

By satisfying the relationship (7), the image side of the third lens and the object side of the fourth lens can have positive and negative opposites, but the radius of curvature with similar values helps to correct the field curvature aberration.

The radius of curvature of the first lens object side surface of the optical imaging lens group is R1, the radius of curvature of the image side surface is R2, the radius of curvature of the second lens object side surface is R3, and the radius of curvature of the image side surface is R4, which satisfies the following relationship :

R1>R2 (8); and

R3>R4 (9);

By satisfying the relational expressions (8) and (9), it is beneficial to expand the imaging viewing angle of the optical imaging lens group, and to correct chromatic aberration and reduce field curvature aberration.

The total thickness of the first lens, the second lens, the third lens and the fourth lens on the optical axis of the optical imaging lens group is CTS, and the object side of the first lens to the image side of the fourth lens on the optical axis The distance is Dr1r8, and the relationship between the two satisfies the following relationship:

0.65>CTS/Dr1r8>0.95 (10);

By satisfying the relationship (10), it is advantageous to control the total length of the optical pickup lens group, so that the optical pickup lens group can meet the requirements of miniaturization of consumer electronic products.

The thickness of the first lens of the optical imaging lens group on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, and the thickness of the fourth lens on the optical axis is CT4, which satisfies the following relationship:

9>(CT3+CT4)/CT1>14 (11);

By satisfying the relationship (11), the optical imaging lens group can have a structure in which the third lens and the fourth lens are thick lenses, which is beneficial to correct the field curvature aberration.

The refractive index of the second lens of the optical imaging lens group is Nd2, and the refractive index of the third lens is Nd3, which satisfies the following relationship:

Nd2>1.7 (12); and

Nd3>1.7 (13);

By satisfying relations (12) and (13), it helps to reduce the imaging aberration of the optical imaging lens group.

The combined focal length of the first lens and the second lens of the optical imaging lens group is f12, which satisfies the following relationship:

f12>0 (14);

By satisfying the relationship (14), the combined focal length of the first lens and the second lens can be controlled to be a positive value, which is beneficial to reduce the imaging aberration.

The distance from the first lens of the optical imaging lens group to the imaging surface of the optical imaging lens group on the optical axis is TTL, and the maximum image height of the optical imaging lens group on the imaging surface is ImgH. The following relationship:

TTL/ImgH>4.2 (15);

By satisfying the relationship (15), it is beneficial to reduce the total length of the optical imaging lens group. First embodiment

Referring to FIGS. 1A and 1B, FIG. 1A is a schematic diagram of an optical imaging lens group according to a first embodiment of the present invention. 1B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism curvature field aberration diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 1A, the optical imaging lens group 10 of the first embodiment includes a first lens 11, an aperture ST, a second lens 12, a third lens 13, and a fourth lens 14 in order from the object side to the image side. The optical imaging lens group 10 may further include a filter element 15, a protective glass 16, and an imaging surface 17. An image sensing element 100 can be further disposed on the imaging surface 17 to form an imaging device (not otherwise labeled).

The first lens 11 has a negative refractive power, the object side surface 11a is a convex surface, the image side surface 11b is a concave surface, and both the object side surface 11a and the image side surface 11b are spherical surfaces. The material of the first lens 11 is glass.

The second lens 12 has a positive refractive power, the object side surface 12a is a convex surface, the image side surface 12b is a concave surface, and both the object side surface 12a and the image side surface 12b are spherical surfaces. The material of the second lens 12 is glass. The combined focal length of the first lens 11 and the second lens 12 is positive.

The third lens 13 has a positive refractive power, its object side 13a is concave, its image side 13b is convex, and both its object side 13a and image side 13b are spherical. The material of the third lens is glass.

The fourth lens 14 has a positive refractive power, its object side 14a is convex, its image side 14b is concave, and its object side 14a and image side 14b are both aspherical. The material of the fourth lens is glass.

The filter element 15 is disposed between the fourth lens 14 and the imaging surface 17 to filter light in a specific wavelength range. The two surfaces 15a and 15b of the filter element 15 are flat surfaces, and the material is glass.

The protective glass 16 is disposed on the image sensing element 100, the two surfaces 16a and 16b are both flat, and the material is glass.

The image sensor (Image Sensor) 100 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The curve equations of each aspheric surface are expressed as follows:

Among them, X: the distance between the point on the aspheric surface from the optical axis Y and the tangent of the aspheric surface on the optical axis;

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

R: radius of curvature of the lens at the near optical axis;

K: cone coefficient; and

Ai: The i-th order aspheric coefficient.

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens group 10 of the first embodiment of the present invention. Among them, the object side surface 11a of the first lens 11 is marked as the surface 11a, the image side surface 11b is marked as the surface 11b, and the other lens surfaces are deduced by analogy. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I. For example, the distance between the object side 11a and the image side 11b of the first lens 11 is 0.5 mm, which means that the first lens 11 is on the optical axis The thickness is 0.5mm. The distance from the image side surface 11b of the first lens 11 to the stop ST is 0.222 mm. Others can be deduced by analogy.

表一 In the first embodiment, the effective focal length of the optical imaging lens group 10 is EFL, the aperture value (F-number) is Fno, and one half of the maximum angle of view of the overall optical imaging lens group 10 is HFOV (Half Field of View). The first The distance between the object side surface 11a of the lens 11 and the imaging surface 18 on the optical axis I is the total length TTL. One half of the diagonal of the effective sensing area of the image sensing element 100 on the imaging surface 18 is the maximum image height ImgH. The values are as follows: EFL=5.55mm, Fno=2.0, TTL=11.98mm, HFOV=30 degrees, ImgH=3.1mm.

Table I

表二 Please refer to Table 2 below, which is the aspheric coefficients of the surfaces of the fourth lens 14 in the first embodiment of the present invention. Where K is the cone coefficient in the aspheric curve equation, and A ₄ to A ₁₆ represent the 4th to 16th aspheric coefficients of each surface. For example, the taper coefficient K of the object side surface 14a of the fourth lens 14 is -0.0452. Others can be deduced by analogy. In addition, the tables in the following embodiments correspond to the optical imaging lens groups in the embodiments, and the definitions of the tables are the same as in this embodiment, so they are not described in detail in the following embodiments.

Table II

In the first embodiment, the relationship between the combined focal length f34 of the third lens 13 and the fourth lens 14 and the effective focal length EFL of the optical pickup lens group 10 is f34/EFL=1.09.

In the first embodiment, the relationship between the effective focal length EFL of the optical imaging lens group 10, the curvature radius R1 of the object side surface 11a of the first lens 11 and the curvature radius R4 of the image side surface 12b of the second lens 12 is EFL/R1+EFL /R4=1.76.

In the first embodiment, the relationship between the focal length f1 of the first lens 11, the focal length f2 of the second lens 12, the focal length f3 of the third lens 13 and the focal length f4 of the fourth lens 14 is |f1|=15.88, f2=7.9 , F3=18.16, f4=13.32, satisfy the relations f2>|f1|, and f4>f3.

In the first embodiment, the relationship between the focal length f2 of the second lens 12 and the effective focal length EFL of the optical imaging lens group 10 is f2/EFL=1.42.

In the first embodiment, the relationship between the dispersion coefficient Vd3 of the third lens 13 and the dispersion coefficient Vd4 of the fourth lens 14 is Vd4-Vd3=29.9.

In the first embodiment, the relationship between the curvature radius R6 of the image side surface 13b of the third lens 13 and the curvature radius R7 of the object side surface 14a of the fourth lens 14 is R6/R7 = -0.99.

In the first embodiment, the relationship between the radius of curvature R1 of the object side surface 11a of the first lens 11, the radius of curvature R2 of the image side surface 11b, the radius of curvature R3 of the object side surface 12a of the second lens 12, and the radius of curvature R4 of the image side surface 12b R1=5.045, R2=3.000, R3=4.043, R4=8.469, satisfying R1>R2, and R3>R4.

In the first embodiment, the total thickness CTS of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 on the optical axis I, and the first lens 11 object side surface 11a to the fourth lens 14 image side The relationship between the distance Dr1r8 of 14b on the optical axis I is CTS/Dr1r8=0.84.

In the first embodiment, the relationship between the thickness CT1 of the first lens 11 on the optical axis and the thickness CT3 of the third lens 13 on the optical axis and the thickness CT4 of the fourth lens 14 on the optical axis is (CT3+ CT4)/CT1=11.22.

In the first embodiment, the refractive index Nd2 of the second lens 12 is 1.878, and the refractive index Nd3 of the third lens 13 is 1.878, which satisfies the following relationship: Nd2>1.7 and Nd3>1.7.

In the first embodiment, the combined focal length f12=17.43 of the first lens 11 and the second lens 12.

In the first embodiment, the relationship between the TTL of the optical pickup lens group 10 and the maximum image height ImgH is TTL/ImgH=3.86.

It can be known from the numerical values of the above relational expressions that the optical pickup lens group 10 of the first embodiment satisfies the requirements of relational expressions (1) to (15).

Referring to FIG. 1B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 10, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.04mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal aberration in the entire field of view has a focal length variation within + 0.04mm; the meridional aberration in the entire field of view has a focal length The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 1B, the optical pickup lens group 10 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Second embodiment

2A and 2B, FIG. 2A is a schematic diagram of an optical imaging lens group 20 according to a second embodiment of the invention. FIG. 2B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), astigmatism/Field Curvature diagram and distortion aberration diagram (Distortion) of the second embodiment of the present invention in order from left to right.

As shown in FIG. 2A, the optical imaging lens group 20 of the second embodiment includes a first lens 21, an aperture ST, a second lens 22, a third lens 23, and a fourth lens 24 in order from the object side to the image side. The optical pickup lens group 20 may further include a filter element 25, a protective glass 26, and an imaging surface 27. An image sensing element 200 can be further disposed on the imaging surface 27 to form an imaging device (not otherwise labeled).

The first lens 21 has a negative refractive power, the object side surface 21a is a convex surface, the image side surface 21b is a concave surface, and the object side surface 21a and the image side surface 21b are both spherical surfaces. The material of the first lens 21 is glass.

The second lens 22 has a positive refractive power, its object side 22a is convex, and its image side 22b is concave, and its object side 22a and image side 22b are both spherical. The material of the second lens 22 is glass.

The third lens 23 has a positive refractive power, its object side 23a is concave, its image side 23b is convex, and both its object side 23a and image side 23b are spherical. The material of the third lens 23 is glass.

The fourth lens 24 has a positive refractive power, its object side 24a is convex, and its image side 24b is concave, and its object side 24a and image side 24b are both aspherical. The material of the fourth lens 24 is glass.

The filter element 25 is disposed between the fourth lens 24 and the imaging surface 27 to filter light in a specific wavelength range. The two surfaces 25a and 25b of the filter element 25 are flat surfaces, and the material is glass.

The protective glass 26 is disposed on the image sensing element 200. Both surfaces 26a and 26b are flat surfaces, and the material is glass.

The image sensor 200 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表三

表四 The detailed optical data of the optical imaging lens group 20 of the second embodiment and the aspheric coefficient of the lens surface are listed in Table 3 and Table 4, respectively. In the second embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 3

Table 4

表五 In the second embodiment, the numerical values of the relational expressions of the optical pickup lens group 20 are listed in Table 5. It can be seen from Table 5 that the optical pickup lens group 20 of the second embodiment satisfies the requirements of relational expressions (1) to (15).

Table 5

Referring to FIG. 2B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatism field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 20, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.04mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal aberration in the entire field of view has a focal length variation within + 0.04mm; the meridional aberration in the entire field of view has a focal length The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 2B, the optical pickup lens group 20 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Third embodiment

3A and 3B, FIG. 3A is a schematic diagram of an optical imaging lens group 30 according to a third embodiment of the invention. FIG. 3B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), astigmatism/Field Curvature diagram and distortion aberration diagram (Distortion) of the third embodiment of the present invention in order from left to right.

As shown in FIG. 3A, the optical imaging lens group 30 of the third embodiment includes a first lens 31, an aperture ST, a second lens 32, a third lens 33, and a fourth lens 34 in order from the object side to the image side. The optical imaging lens group 30 may further include a filter element 35, a protective glass 36, and an imaging surface 37. An image sensing element 300 may be further disposed on the imaging surface 37 to form an imaging device (not otherwise labeled).

The first lens 31 has a negative refractive power, the object side surface 31a is a convex surface, the image side surface 31b is a concave surface, and the object side surface 31a and the image side surface 31b are both spherical surfaces. The material of the first lens 31 is glass.

The second lens 32 has a positive refractive power, its object side surface 32a is a convex surface, and the image side surface 32b is a concave surface, and its object side surface 32a and image side surface 32b are both spherical surfaces. The material of the second lens 32 is glass.

The third lens 33 has a positive refractive power, its object side 33a is concave, its image side 33b is convex, and both its object side 33a and image side 33b are spherical. The material of the third lens 33 is glass.

The fourth lens 34 has a positive refractive power, its object side 34a is convex, and its image side 34b is concave, and its object side 34a and image side 34b are both aspherical. The material of the fourth lens 34 is glass.

The filter element 35 is disposed between the fourth lens 34 and the imaging surface 37 to filter light in a specific wavelength range. The two surfaces 35a and 35b of the filter element 35 are flat surfaces, and the material is glass.

The protective glass 36 is disposed on the image sensing element 300, the two surfaces 36a and 36b are both flat, and the material is glass.

The image sensor (Image Sensor) 300 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表六

表七 The detailed optical data of the optical imaging lens group 30 of the third embodiment and the aspheric coefficient of the lens surface are listed in Table 6 and Table 7, respectively. In the third embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 6

Table 7

表八 In the third embodiment, the numerical values of the relational expressions of the optical pickup lens group 30 are listed in Table 8. It can be seen from Table 8 that the optical pickup lens group 30 of the third embodiment satisfies the requirements of relational expressions (1) to (15).

Table 8

Referring to FIG. 3B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram and the distortion aberration diagram of the optical imaging lens group 30, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm, and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.02mm. From the astigmatic field aberration diagram (wavelength 940nm), it can be seen that the variation of the focal length of the sagittal direction aberration in the entire field of view is within + 0.08mm; the focal length of the meridional direction aberration in the entire field of view The amount of change is within + 0.06mm; and the distortion aberration can be controlled within 4%. As shown in FIG. 3B, the optical pickup lens group 30 of the present embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Fourth embodiment

4A and 4B, FIG. 4A is a schematic diagram of an optical imaging lens group 40 according to a fourth embodiment of the invention. 4B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism curvature field aberration diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 4A, the optical imaging lens group 40 of the fourth embodiment includes a first lens 41, an aperture ST, a second lens 42, a third lens 43, and a fourth lens 44 in order from the object side to the image side. The optical pickup lens group 40 may further include a filter element 45, a protective glass 46, and an imaging surface 47. An image sensing element 400 can be further disposed on the imaging surface 47 to form an imaging device (not otherwise labeled).

The first lens 41 has a negative refractive power, the object side surface 41a is a convex surface, the image side surface 41b is a concave surface, and both the object side surface 41a and the image side surface 41b are spherical surfaces. The material of the first lens 41 is glass.

The second lens 42 has a positive refractive power, its object side 42a is convex, the image side 42b is concave, and its object side 42a and image side 42b are both spherical. The material of the second lens 42 is glass.

The third lens 43 has a positive refractive power, its object side 43a is concave, its image side 43b is convex, and its object side 43a and image side 43b are both spherical. The material of the third lens 43 is glass.

The fourth lens 44 has a positive refractive power, its object side 44a is convex, and its image side 44b is concave, and its object side 44a and image side 44b are both aspherical. The material of the fourth lens 44 is glass.

The filter element 45 is disposed between the fourth lens 44 and the imaging surface 47 to filter light in a specific wavelength range. The two surfaces 45a and 45b of the filter element 45 are flat surfaces, and the material is glass.

The protective glass 46 is disposed on the image sensing element 400. Both surfaces 46a and 46b are flat surfaces, and the material is glass.

The image sensor (Image Sensor) 400 is, for example, a charge-coupled device (Charge-Coupled Device (CCD) Image Sensor) or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表九

表十 The detailed optical data of the optical imaging lens group 40 of the fourth embodiment and the aspheric coefficient of the lens surface are listed in Table 9 and Table 10, respectively. In the fourth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 9

Table ten

表十一 In the fourth embodiment, the numerical values of the relational expressions of the optical pickup lens group 40 are listed in Table 11. It can be seen from Table 11 that the optical pickup lens group 40 of the fourth embodiment satisfies the requirements of relational expressions (1) to (15).

Table eleven

4B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram and the distortion aberration diagram of the optical imaging lens group 40, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm, and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.02mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal direction aberration changes the focal length in the entire field of view within + 0.07mm; the meridional direction aberration in the entire field of view The amount of change is within + 0.05mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 4B, the optical pickup lens group 40 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Fifth embodiment

5A and 5B, FIG. 5A is a schematic diagram of an optical imaging lens group 50 according to a fifth embodiment of the invention. FIG. 5B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), astigmatism/Field Curvature diagram and distortion aberration diagram (Distortion) of the fifth embodiment of the present invention in order from left to right.

As shown in FIG. 5A, the optical pickup lens group 50 of the fifth embodiment includes a first lens 51, an aperture ST, a second lens 52, a third lens 53, and a fourth lens 54 in order from the object side to the image side. The optical pickup lens group 50 may further include a filter element 55, a protective glass 56, and an imaging surface 57. An image sensing element 500 may be further disposed on the imaging surface 57 to form an imaging device (not otherwise labeled).

The first lens 51 has a negative refractive power, the object side surface 51a is a convex surface, the image side surface 51b is a concave surface, and both the object side surface 51a and the image side surface 51b are spherical surfaces. The material of the first lens 51 is glass.

The second lens 52 has a positive refractive power, the object side surface 52a is a convex surface, the image side surface 52b is a concave surface, and the object side surface 52a and the image side surface 52b are both spherical surfaces. The material of the second lens 52 is glass.

The third lens 53 has a positive refractive power, its object side 53a is concave, its image side 53b is convex, and its object side 53a and image side 53b are both spherical. The material of the third lens 53 is glass.

The fourth lens 54 has a positive refractive power, its object side 54a is convex, and its image side 54b is concave, and its object side 54a and image side 54b are both aspherical. The material of the fourth lens 54 is glass.

The filter element 55 is disposed between the fourth lens 54 and the imaging surface 57 to filter light in a specific wavelength range. The two surfaces 55a and 55b of the filter element 55 are flat surfaces, and the material is glass.

The protective glass 56 is disposed on the image sensing element 500. Both surfaces 56a and 56b are flat surfaces, and the material is glass.

The image sensor 500 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表十二

表十三 The detailed optical data of the optical imaging lens group 50 and the aspheric coefficient of the lens surface of the fifth embodiment are listed in Table 12 and Table 13, respectively. In the fifth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 12

Table XIII

表十四 In the fifth embodiment, the numerical values of the relational expressions of the optical pickup lens group 50 are listed in Table 14. It can be seen from Table 14 that the optical pickup lens group 50 of the fifth embodiment satisfies the requirements of relational expressions (1) to (15).

Table 14

5B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram, and the distortion aberration diagram of the optical imaging lens group 50, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.04mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal direction aberration has a focal length variation within + 0.06mm in the entire field of view; the meridional direction aberration has a focal length in the entire field of view The amount of change is within + 0.05mm; and the distortion aberration can be controlled within 9%. As shown in FIG. 5B, the optical pickup lens group 50 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Sixth embodiment

6A and 6B, FIG. 6A is a schematic diagram of an optical imaging lens group 60 according to a sixth embodiment of the invention. 6B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism curvature field aberration diagram (Astigmatism/Field Curvature), and a distortion aberration diagram (Distortion) in order from left to right in order.

As shown in FIG. 6A, the optical pickup lens group 60 of the sixth embodiment includes a first lens 61, an aperture ST, a second lens 62, a third lens 63, and a fourth lens 64 in order from the object side to the image side. The optical pickup lens group 60 may further include a filter element 65, a protective glass 66, and an imaging surface 67. An image sensing element 600 can be further disposed on the imaging surface 67 to form an imaging device (not otherwise labeled).

The first lens 61 has a negative refractive power, the object side surface 61a is a convex surface, the image side surface 61b is a concave surface, and both the object side surface 61a and the image side surface 61b are spherical surfaces. The material of the first lens 61 is glass.

The second lens 62 has a positive refractive power, its object side 62a is convex, and its image side 62b is concave, and its object side 62a and image side 62b are both spherical. The material of the second lens 62 is glass.

The third lens 63 has a positive refractive power, its object side 63a is concave, its image side 63b is convex, and its object side 63a and image side 63b are both spherical. The material of the third lens 63 is glass.

The fourth lens 64 has a positive refractive power, its object side 64a is convex, and its image side 64b is concave, and its object side 64a and image side 64b are both aspherical. The material of the fourth lens 64 is glass.

The filter element 65 is disposed between the fourth lens 64 and the imaging surface 67 to filter light in a specific wavelength range. The two surfaces 65a and 65b of the filter element 65 are all flat, and the material is glass.

The protective glass 66 is disposed on the image sensing element 600. Both surfaces 66a and 66b are flat surfaces, and the material is glass.

The image sensor (Image Sensor) 600 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表十五

表十六 The detailed optical data of the optical imaging lens group 60 of the sixth embodiment and the aspheric coefficient of the lens surface are listed in Table 15 and Table 16, respectively. In the sixth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 15

Table 16

表十七 In the sixth embodiment, the numerical values of the relational expressions of the optical pickup lens group 60 are listed in Table 17. It can be seen from Table 17 that the optical pickup lens group 60 of the sixth embodiment satisfies the requirements of relational expressions (1) to (15).

Table 17

Referring to FIG. 6B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram, and the distortion aberration diagram of the optical imaging lens group 60, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm, and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 940nm) that the sagittal direction aberration has a focal length variation within + 0.07mm in the entire field of view; the meridional direction aberration has a focal length in the entire field of view The amount of change is within + 0.07mm; and the distortion aberration can be controlled within 6%. As shown in FIG. 6B, the optical pickup lens group 60 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Seventh embodiment

7A and 7B, FIG. 7A is a schematic diagram of an optical imaging lens group 70 according to a seventh embodiment of the invention. 7B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism curvature field aberration diagram (Astigmatism/Field Curvature), and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 7A, the optical pickup lens group 70 of the seventh embodiment includes a first lens 71, an aperture ST, a second lens 72, a third lens 73, and a fourth lens 74 in order from the object side to the image side. The optical pickup lens group 70 may further include a filter element 75, a protective glass 76, and an imaging surface 77. An image sensing element 700 can be further disposed on the imaging surface 77 to form an imaging device (not otherwise labeled).

The first lens 71 has a negative refractive power, the object side surface 71a is a convex surface, the image side surface 71b is a concave surface, and the object side surface 71a and the image side surface 71b are both spherical surfaces. The material of the first lens 71 is glass.

The second lens 72 has a positive refractive power, its object side 72a is convex, and its image side 72b is concave, and its object side 72a and image side 72b are both spherical. The material of the second lens 72 is glass.

The third lens 73 has a positive refractive power, its object side 73a is concave, its image side 73b is convex, and both its object side 73a and image side 73b are spherical. The material of the third lens 73 is glass.

The fourth lens 74 has a positive refractive power, its object side 74a is convex, and its image side 74b is concave, and its object side 74a and image side 74b are both aspherical. The material of the fourth lens 74 is glass.

The filter element 75 is disposed between the fourth lens 74 and the imaging surface 77 to filter light in a specific wavelength range. The two surfaces 75a and 75b of the filter element 75 are flat surfaces, and the material is glass.

The protective glass 76 is disposed on the image sensing element 700. Both surfaces 76a and 76b are flat surfaces, and the material is glass.

The image sensor (Image Sensor) 700 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表十八

表十九 The detailed optical data of the optical imaging lens group 70 of the seventh embodiment and the aspheric coefficient of the lens surface are listed in Table 18 and Table 19, respectively. In the seventh embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 18

Table 19

表二十 In the seventh embodiment, the numerical values of each relational expression of the optical pickup lens group 70 are listed in Table 20. It can be seen from Table 20 that the optical pickup lens group 70 of the seventh embodiment satisfies the requirements of relational expressions (1) to (15).

Table 20

Referring to FIG. 7B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram, and the distortion aberration diagram of the optical imaging lens group 70, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm, and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.02mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal direction aberration has a focal length variation within + 0.06mm in the entire field of view; the meridional direction aberration has a focal length in the entire field of view The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 2%. As shown in FIG. 7B, the optical pickup lens group 70 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Eighth embodiment

8A and 8B, FIG. 8A is a schematic diagram of an optical imaging lens group 80 according to an eighth embodiment of the present invention. 8B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism curvature field aberration diagram (Astigmatism/Field Curvature), and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 8A, the optical pickup lens group 80 of the eighth embodiment includes a first lens 81, an aperture ST, a second lens 82, a third lens 83, and a fourth lens 84 in order from the object side to the image side. The optical pickup lens group 80 may further include a filter element 85, a protective glass 86, and an imaging surface 87. An image sensing element 800 can be further disposed on the imaging surface 87 to form an imaging device (not otherwise labeled).

The first lens 81 has a negative refractive power, the object side surface 81a is a convex surface, the image side surface 81b is a concave surface, and both the object side surface 81a and the image side surface 81b are spherical surfaces. The material of the first lens 81 is glass.

The second lens 82 has a positive refractive power, its object side 82a is convex, and its image side 82b is concave, and its object side 82a and image side 82b are both spherical. The material of the second lens 82 is glass.

The third lens 83 has a positive refractive power, its object side 83a is concave, its image side 83b is convex, and its object side 83a and image side 83b are both spherical. The material of the third lens 83 is glass.

The fourth lens 84 has a positive refractive power, its object side 84a is convex, and its image side 84b is concave, and its object side 84a and image side 84b are both aspherical. The material of the fourth lens 84 is glass.

The filter element 85 is disposed between the fourth lens 84 and the imaging surface 87 to filter light in a specific wavelength range. The two surfaces 85a and 85b of the filter element 85 are flat surfaces, and the material is glass.

The protective glass 86 is disposed on the image sensing element 800. Both surfaces 86a and 86b are flat surfaces, and the material is glass.

The image sensor 800 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor image sensor (CMOS Image Sensor).

表二十一

表二十二 The detailed optical data of the optical imaging lens group 80 of the eighth embodiment and the aspheric coefficient of the lens surface are listed in Table 21 and Table 22, respectively. In the eighth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment.

Table 21

Table 22

表二十三 In the eighth embodiment, the numerical values of the relational expressions of the optical pickup lens group 80 are listed in Table 23. It can be seen from Table 23 that the optical pickup lens group 80 of the eighth embodiment satisfies the requirements of the relational expressions (1) to (15).

Table 23

Referring to FIG. 8B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatism field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 80, respectively. It can be seen from the longitudinal spherical aberration diagram that the three near-infrared wavelengths of 930nm, 940nm, and 950nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within + 0.03mm. It can be seen from the aberration field curvature aberration diagram (wavelength 940nm) that the sagittal direction aberration has a focal length variation within + 0.06mm in the entire field of view; the meridional direction aberration has a focal length in the entire field of view The amount of change is within + 0.03mm; and the distortion aberration can be controlled within 8%. As shown in FIG. 8B, the optical pickup lens group 80 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system. Ninth embodiment

A ninth embodiment of the present invention is an imaging device. The imaging device includes the optical pickup lens group as described in the first to eighth embodiments, and an image sensing element; wherein the image sensing element is disposed on the optical pickup lens The imaging surface of the group. The image sensing device is, for example, a charge-coupled device (Charge-Coupled Device, CCD) or a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) image sensing device. The imaging device is, for example, a camera module for vehicle photography, a camera module for portable electronic products, or a camera module for surveillance cameras. Tenth embodiment

Please refer to FIG. 9, which is a schematic diagram of an electronic device 1000 according to a tenth embodiment of the present invention. As shown, the electronic device 1000 includes an imaging device 1010 and a near-infrared emitting element 1020, wherein the near-infrared emitting element 1020 is disposed beside the imaging device 1010. The imaging device 1010 is, for example, the imaging device of the foregoing tenth embodiment, and may be composed of the optical imaging lens group and an image sensing element of the present invention. The near-infrared emitting element 1020 is, for example, a near-infrared lamp for emitting a near-infrared beam with a wavelength of 700 nm to 1000 nm. The near-infrared emitting element 1020 can irradiate the near-infrared beam toward the front object, and then use the near-infrared beam reflected on the surface of the subject to perform image capturing. The electronic device 1000 is, for example, a driving monitoring device or a surveillance camera.

Although the present invention is described using the foregoing several embodiments, these embodiments are not intended to limit the scope of the present invention. For anyone who is familiar with this art, without departing from the spirit and scope of the present invention, various changes in form and details can still be made with reference to the contents of the embodiments disclosed in the present invention. Therefore, it should be understood that the present invention is subject to the scope defined in the following patent application, and any changes made within the scope of the patent application or its equivalent should still fall within the application of the present invention Within the scope of the patent.

10, 20, 30, 40, 50, 60, 70, 80: optical pickup lens group 11, 21, 31, 41, 51, 61, 71, 81: the first lens 12, 22, 32, 42, 52, 62, 72, 82: second lens 13, 23, 33, 43, 53, 63, 73, 83: third lens 14, 24, 34, 44, 54, 64, 74, 84: fourth lens 15, 25, 35, 45, 55, 65, 75, 85: filter element 16, 26, 36, 46, 56, 66, 76, 86: protective glass 17, 27, 37, 47, 57, 67, 77, 87: imaging plane 11a, 21a, 31a, 41a, 51a, 61a, 71a, 81a: the object side of the first lens 11b, 21b, 31b, 41b, 51b, 61b, 71b, 81b: the image side of the first lens 12a, 22a, 32a, 42a, 52a, 62a, 72a, 82a: the object side of the second lens 12b, 22b, 32b, 42b, 52b, 62b, 72b, 82b: the image side of the second lens 13a, 23a, 33a, 43a, 53a, 63a, 73a, 83a: object side of the third lens 13b, 23b, 33b, 43b, 53b, 63b, 73b, 83b: the image side of the third lens 14a, 24a, 34a, 44a, 54a, 64a, 74a, 84a: the object side of the fourth lens 14b, 24b, 34b, 44b, 54b, 64b, 74b, 84b: the image side of the fourth lens 15a, 15b, 25a, 25b, 35a, 35b, 45a, 45b, 55a, 55b, 65a, 65b, 75a, 75b, 85a, 85b: the second surface of the filter element 16a, 16b, 26a, 26b, 36a, 36b, 46a, 46b, 56a, 56b, 66a, 66b, 76a, 76b, 86a, 86b: the second surface of the protective glass 100, 200, 300, 400, 500, 600, 700, 800: image sensing element 1000: electronic device 1010: Imaging device 1020: Near-infrared emitting element I: optical axis ST: Aperture

[FIG. 1A] A schematic diagram of an optical imaging lens group according to the first embodiment of the present invention; [FIG. 1B] From left to right are the longitudinal spherical aberration diagram, astigmatic field aberration diagram and distortion aberration diagram of the first embodiment of the present invention; [FIG. 2A] A schematic diagram of an optical imaging lens group according to a second embodiment of the invention; [FIG. 2B] From left to right are the longitudinal spherical aberration diagram, astigmatic field curvature aberration diagram and distortion aberration diagram of the second embodiment of the present invention; [FIG. 3A] A schematic diagram of an optical imaging lens group according to a third embodiment of the invention; [FIG. 3B] From left to right are the longitudinal spherical aberration diagram, astigmatic field curvature aberration diagram and distortion aberration diagram of the third embodiment of the present invention; [FIG. 4A] A schematic diagram of an optical imaging lens group according to a fourth embodiment of the invention; [FIG. 4B] From left to right are the longitudinal spherical aberration diagram, astigmatic field curvature aberration diagram and distortion aberration diagram of the fourth embodiment of the present invention; [FIG. 5A] A schematic diagram of an optical imaging lens group according to a fifth embodiment of the present invention; [FIG. 5B] From left to right are the longitudinal spherical aberration diagram, astigmatism curvature aberration diagram and distortion aberration diagram of the fifth embodiment of the present invention; [FIG. 6A] A schematic diagram of an optical imaging lens group according to a sixth embodiment of the invention; [FIG. 6B] From left to right are the longitudinal spherical aberration diagram, astigmatic field curvature aberration diagram and distortion aberration diagram of the sixth embodiment of the present invention; [FIG. 7A] A schematic diagram of an optical imaging lens group according to a seventh embodiment of the invention; [FIG. 7B] From left to right are the longitudinal spherical aberration diagram, astigmatism curvature aberration diagram and distortion aberration diagram of the seventh embodiment of the present invention; [FIG. 8A] A schematic diagram of an optical imaging lens group according to an eighth embodiment of the invention; [FIG. 8B] From left to right are the longitudinal spherical aberration diagram, astigmatic field aberration diagram and distortion aberration diagram of the eighth embodiment of the present invention; and [FIG. 9] is a schematic diagram of an electronic device according to a tenth embodiment of the invention.

10: Optical imaging lens group

11: First lens

12: Second lens

13: Third lens

14: fourth lens

15: filter element

16: Protective glass

17: imaging surface

11a: Object side of the first lens

11b: Image side of the first lens

12a: Object side of the second lens

12b: Image side of the second lens

13a: Object side of the third lens

13b: Image side of the third lens

14a: Object side of fourth lens

14b: Image side of fourth lens

15a, 15b: the second surface of the filter element

16a, 16b: the second surface of the protective glass

100: image sensor

I: optical axis

ST: Aperture

Claims (19)

An optical imaging lens group, which includes the object side to the image side in order: A first lens with negative refractive power, the image side is concave; An aperture A second lens with positive refractive power, the object side is convex and the image side is concave; A third lens with positive refractive power and a convex image side; and A fourth lens with a positive refractive power and a convex surface on the object side; wherein, the total number of lenses of the optical imaging lens group is four; the combined focal length of the third lens and the fourth lens is f34, the optical imaging The effective focal length of the lens group is EFL, the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the second lens is R4, which satisfies the following relationship: 0.9> f34/EFL >1.4; and 0.9>EFL/R1+EFL/R4>3.2. For example, the optical imaging lens group of the first patent application, in which 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, and the focal length of the fourth lens is f4, which satisfies the following relationship: f2>|f1|; and f4>f3. For example, the optical imaging lens group of the first patent application, wherein the focal length of the second lens is f2, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 0.8>f2/EFL>2.6. For example, in the optical imaging lens group of the first patent application, the dispersion coefficient of the third lens is Vd3, and the dispersion coefficient of the fourth lens is Vd4, which satisfies the following relationship: 20>Vd4-Vd3>40. An optical imaging lens group, which includes the object side to the image side in order: A first lens with negative refractive power, the image side is concave; An aperture A second lens with positive refractive power, the object side is convex and the image side is concave; A third lens with positive refractive power and a convex image side; and A fourth lens has a positive refractive power, and its object side is convex; wherein, the total number of lenses of the optical imaging lens group is four; the focal length of the first lens is f1, and the focal length of the second lens is f2, the The focal length of the third lens is f3, the focal length of the fourth lens is f4, the effective focal length of the optical pickup lens group is EFL, the dispersion coefficient of the third lens is Vd3, and the dispersion coefficient of the fourth lens is Vd4, which Meet the following relationship: 0.8>f2/EFL>2.6; f2>|f1|; f4>f3; and 20>Vd4-Vd3>40. For example, the optical imaging lens group of claim 5 of the patent scope, wherein the combined focal length of the third lens and the fourth lens is f34, and the effective focal length of the optical imaging lens group is EFL, satisfying the following relationship formula: 0.9> f34/EFL >1.4. For example, the optical imaging lens group of claim 5 of the patent application, wherein the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the second lens is R4, and the optical imaging lens group satisfies the following relationship : 0.9>EFL/R1+EFL/R4>3.2. For example, in the optical imaging lens group of claim 1 or item 5, the radius of curvature of the image side of the third lens is R6, and the radius of curvature of the object side of the fourth lens is R7, which satisfies the following relationship: -1.2>R6/R7> -0.9. For example, the optical imaging lens group of claim 1 or item 5, wherein the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side is R2, and the radius of curvature of the object side of the second lens is R3. The radius of curvature of the image side is R4. The first lens and the second lens satisfy the following relationship: R1>R2; and R3>R4. If the optical imaging lens group of the first or fifth patent application scope, wherein the total thickness of the first lens, the second lens, the third lens and the fourth lens on the optical axis is CTS, the The distance from the object side of the first lens to the image side of the fourth lens on the optical axis is Dr1r8, which satisfies the following relationship: 0.65>CTS/Dr1r8>0.95. For example, the optical imaging lens group of claim 1 or claim 5, wherein the thickness of the first lens on the optical axis is CT1, the thickness of the third lens on the optical axis is CT3, and the fourth lens The thickness on the optical axis is CT4, which satisfies the following relationship: 9>(CT3+CT4)/CT1>14. For example, in the optical imaging lens group of claim 1 or claim 5, the refractive index of the second lens is Nd2 and the refractive index of the third lens is Nd3, which satisfies the following relationship: Nd2>1.7; and Nd3>1.7. For example, in the optical imaging lens group of claim 1 or claim 5, the combined focal length of the first lens and the second lens is a positive value. For example, the optical imaging lens group of the first or fifth patent application scope, wherein the distance from the first lens to the imaging surface of the optical imaging lens group on the optical axis is TTL, and the optical imaging lens group is used for imaging The maximum image height on the surface is ImgH, and the optical imaging lens group satisfies the following relationship: TTL/ImgH>4.2. For example, in the optical imaging lens group of claim 1 or claim 5, the object side of the third lens is concave. For example, in the optical imaging lens group of claim 1 or item 5, the image side of the fourth lens is concave. For example, in the optical imaging lens group of claim 1 or claim 5, the object side and the image side of the fourth lens are aspherical. An imaging device includes an optical imaging lens group as claimed in item 1 or 5 of the patent application and an image sensing element, the image sensing element being disposed on the imaging surface of the optical imaging lens group. An electronic device comprising an imaging device as claimed in claim 18 and a near-infrared emitting element, the near-infrared emitting element is disposed beside the imaging device for emitting a near-infrared beam, wherein the near-infrared emitting element is used The near-infrared beam is emitted toward the subject, so that the imaging device can capture the image using the near-infrared beam reflected on the surface of the subject.

Images