TWM641851U - Optical imaging lens, imaging device and electronic device - Google Patents

Abstract

An optical imaging lens includes, from object side to image side, the first lens has refractive power; the second lens has refractive power; the third lens has refractive power; the fourth lens has refractive power; at least one of the first lens, the second lens, the third lens and the fourth lens has positive refractive power. When specific conditions are satisfied, the optical imaging lens can have a compact size and good imaging qualities.

Description

Optical imaging lens group, imaging device and electronic device

The invention relates to an optical imaging device, especially an optical imaging lens group that can be used in ordinary electronic devices, vehicle electronic devices or driving photography devices, and an imaging device and an electronic device with the optical imaging lens group.

With the advancement of semiconductor process technology, the size of photosensitive elements (such as CCD and CMOS Image Sensor) required for photographic devices can be reduced and meet the requirements of miniaturized photographic devices, which drives consumer electronics to be equipped with miniaturized camera devices. ) to increase the development trend of product added value. Take portable electronic devices such as smart phones as an example. Because of their lightness and portability, consumers nowadays mostly use mobile phones to take pictures instead of using traditional digital cameras. However, consumers have increasingly higher requirements for portable electronic devices. Apart from the pursuit of beautiful appearance, they also require small size and light weight. Therefore, the small camera device mounted on the portable electronic device must be further miniaturized in overall size, so as to be installed in the thin and light electronic product.

In view of the increasing requirements of consumers for imaging quality of imaging devices, especially clear imaging quality, how to provide an optical imaging device with good imaging quality and miniaturization to meet the needs of various photo-taking occasions has become an issue. Problems that people in the technical field are eager to solve.

Therefore, in order to solve the above problems, the present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens and a fourth lens from the object side to the image side. Wherein, the first lens has refractive power, the second lens has refractive power, the third lens has refractive power, and the fourth lens has refractive power. The total number of lenses in the optical imaging lens group is four pieces; at least one of the first lens to the fourth lens has a positive refractive power; the combined focal length of the second lens to the fourth lens is f234, and the optical take The effective focal length of the image lens group is EFL, which satisfies the following relationship: |f234/EFL|<250.0.

According to the embodiment of the invention, the radius of curvature of the object side of the third lens is R31, and the optical effective radius of the object side of the third lens perpendicular to the optical axis is D31, which satisfies the following relationship: |R31/D31|<5.0.

According to an embodiment of the invention, the distance between the object side of the second lens and the image side of the three lenses on the optical axis is TT23, the object side of the third lens has an intersection point with the optical axis, and the object side of the third lens has a The critical point, a projected distance from the intersection point to the critical point on the optical axis is S31, which satisfies the following relationship: 0<TT23/S31<15.0.

This creation also provides an optical imaging lens group, the radius of curvature of the object side of the second lens is R21, and the combined focal length of the first lens to the second lens is f12, which satisfies the following relationship: |R21/f12|< 25.0.

According to the embodiment of the invention, the maximum image height ImgH of the optical imaging lens group, the total length of the optical imaging lens group is TTL, which satisfies the following relationship: 0.5<TTL/ImgH<3.5.

Another embodiment of the present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens and a fourth lens from the object side to the image side. Wherein, the first lens has refractive power, and its object side is convex; the second lens has refractive power, the third lens has refractive power, and the fourth lens has refractive power. The total number of lenses in the optical imaging lens group is four; the first lens and the third lens have positive Refractive power or negative refractive power, the optical effective radius of the object side of the second lens perpendicular to the optical axis is D21, the object side of the second lens has an intersection point with the optical axis, and the object side of the second lens has a critical point, the A projection distance from the intersection point to the critical point on the optical axis is S21, which satisfies the following relationship: 0<D21/S21<40.0.

According to the embodiment of the invention, the radius of curvature of the image side of the second lens is R22, and the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, which satisfies the following relationship: |R22/AT23 |<150.0.

According to the embodiment of the invention, the combined focal length from the second lens to the third lens is f23, and the combined focal length from the first lens to the second lens is f12, which satisfy the following relationship: |f23/f12|<0.6 .

According to the embodiment of the present creation, the maximum image height ImgH of the optical imaging lens group, the distance from the object side of the second lens to the image side of the three lenses on the optical axis is TT23, which satisfies the following relationship: 0<ImgH/ TT23<5.0.

According to the embodiment of the invention, the optical effective radius of the second lens image side perpendicular to the optical axis is D22, the second lens image side has an intersection point with the optical axis, and the second lens image side has a critical point, the A projection distance from the intersection point to the critical point on the optical axis is S22, and the radius of curvature of the image side of the second lens is R22, which satisfies the following relationship: |(D22/S22)*(R22/S22)|/(10 ⁴ )<9.0.

Still another embodiment of the present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens and a fourth lens from the object side to the image side. Wherein, the first lens has refractive power, the second lens has refractive power, the third lens has refractive power, and the fourth lens has negative refractive power. The total number of lenses in the optical imaging lens group is four; the first lens and the third lens have positive or negative refractive power, the combined focal length from the second lens to the third lens is f23, the second The distance on the optical axis from the object side of the lens to the image side of the three lenses is TT23, which satisfies the following relationship: |f23/TT23|<20.0.

According to the embodiment of the invention, the radius of curvature of the image side of the third lens is R32, and the optical effective radius of the image side of the third lens perpendicular to the optical axis is D32, which satisfies the following relationship: |R32/D32|<2.0.

According to the embodiment of the invention, the combined focal length from the first lens to the third lens is f123, and the combined focal length from the second lens to the fourth lens is f234, which satisfy the following relationship: |f123/f234|<1.0 .

According to an embodiment of the invention, the optical effective radius of the third lens image side perpendicular to the optical axis is D32, the third lens image side has an intersection point with the optical axis, and the third lens image side has a critical point, the third lens image side has a critical point, the A projected distance from the intersection point to the critical point on the optical axis is S32, which satisfies the following relationship: |D32/S32|<5.0.

According to the embodiment of the invention, the optical effective radius of the second lens image side perpendicular to the optical axis is D22, the optical effective radius of the third lens object side perpendicular to the optical axis is D31, and the second lens image side is along the optical axis. The distance to the object side of the third lens is AT23, which satisfies the following relationship: 1.0<(D22/AT23)+(D31/TT23)<10.0.

The 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 invention further provides an electronic device, which includes the aforementioned imaging device.

10, 20, 30, 40, 50, 60, 70, 80, 90: Optical imaging lens group

11, 21, 31, 41, 51, 61, 71, 81, 91: the first lens

12, 22, 32, 42, 52, 62, 72, 82, 92: second lens

13, 23, 33, 43, 53, 63, 73, 83, 93: third lens

14, 24, 34, 44, 54, 64, 74, 84, 94: fourth lens

15, 25, 35, 45, 55, 65, 75, 85, 95: Filter cover assembly

16, 26, 36, 46, 56, 66, 76, 86, 96: imaging surface

11a, 21a, 31a, 41a, 51a, 61a, 71a, 81a, 91a: the object side of the first lens

11b, 21b, 31b, 41b, 51b, 61b, 71b, 81b, 91b: the image side of the first lens

12a, 22a, 32a, 42a, 52a, 62a, 72a, 82a, 92a: the object side of the second lens

12b, 22b, 32b, 42b, 52b, 62b, 72b, 82b, 92b: the image side of the second lens

13a, 23a, 33a, 43a, 53a, 63a, 73a, 83a, 93a: the object side of the third lens

13b, 23b, 33b, 43b, 53b, 63b, 73b, 83b, 93b: the image side of the third lens

14a, 24a, 34a, 44a, 54a, 64a, 74a, 84a, 94a: the object side of the fourth lens

14b, 24b, 34b, 44b, 54b, 64b, 74b, 84b, 94b: the image side of the fourth lens

15a, 15b, 25a, 25b, 35a, 35b, 45a, 45b, 55a, 55b, 65a, 65b, 75a, 75b, 85a, 86b, 95a, 96b: two surfaces of the filter cover assembly

100, 200, 300, 400, 500, 600, 700, 800, 900: Image sensor

1000: electronic device

1010: imaging device

I: optical axis

ST: Aperture

[Fig. 1A] is a schematic diagram of the optical imaging lens group and imaging device of the first embodiment of the invention; [Fig. 1B] From left to right is the astigmatism field curve diagram, distortion diagram and longitudinal spherical aberration diagram of the first embodiment of this creation; [Fig. 2A] is the optical imaging lens group and imaging of the second embodiment of this creation Schematic diagram of the device; [Fig. 2B] from left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the second embodiment of this creation; [Fig. 3A] is the optical imaging lens of the third embodiment of this creation Schematic diagram of the group and imaging device; [Fig. 3B] from left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the third embodiment of this creation; [Fig. 4A] is the optics of the fourth embodiment of this creation Schematic diagram of the imaging lens group and imaging device; [Fig. 4B] from left to right is the astigmatic field curve diagram, distortion diagram and longitudinal spherical aberration diagram of the fourth embodiment of this creation; [Fig. 5A] is the fifth embodiment of this creation Schematic diagram of an example optical imaging lens group and imaging device; [Fig. 5B] from left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the fifth embodiment of this creation; [Fig. 6A] is this creation Schematic diagram of the optical imaging lens group and imaging device of the sixth embodiment; [Fig. 6B] from left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the sixth embodiment of this creation; [Fig. 7A] Schematic diagram of the optical imaging lens group and imaging device of the seventh embodiment of this creation; [Fig. 7B] from left to right is the astigmatic field curvature diagram, distortion diagram and longitudinal spherical aberration diagram of the seventh embodiment of this creation; [ Fig. 8A] is a schematic diagram of the optical imaging lens group and imaging device of the eighth embodiment of the invention; [Fig. 8B] is the astigmatic field curvature diagram, distortion diagram and longitudinal spherical aberration of the eighth embodiment of the invention in sequence from left to right Figure; [Fig. 9A] is the schematic diagram of the optical imaging lens group and the imaging device of the ninth embodiment of the present creation; [FIG. 9B] From left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the ninth embodiment of the invention; [FIG. 10] is a schematic diagram of the electronic device of the tenth embodiment of the invention.

In the following embodiments, each lens of the optical imaging lens group can 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, it can reduce the impact of environmental changes on the optical imaging lens group, thereby extending the optical life. 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 the production cost.

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

In embodiments of the present invention, the object and image sides of each lens may be spherical or aspheric surfaces. Using an aspheric surface on the lens helps to correct the imaging aberrations of the optical imaging lens group such as spherical aberration, and reduces the number of optical lens elements used. Although in the embodiment of the present invention, some optical lenses use aspherical surfaces, they can still be designed as spherical surfaces as required.

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

The invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens and a fourth lens from the object side to the image side; wherein, the total number of lenses in the optical imaging lens group is four.

The first lens has a positive refractive power, its object side is convex, and its image side is convex or concave, so as to meet the requirements of practical applications, thereby helping to shorten the total length of the optical system. Preferably, the material of the first lens is plastic, so as to reduce manufacturing cost and facilitate processing. In an embodiment of the present invention, the object side or/and image side of the first lens can be aspherical, so as to improve spherical aberration and off-axis aberration.

The second lens has negative refractive power, its object side can be convex or concave, and its image side can be convex or concave. Utilizing the negative refractive power of the second lens helps to adjust the light path and correct chromatic aberration. In this inventive embodiment, the material of the second lens is plastic, so as to reduce manufacturing cost and facilitate processing. In an embodiment of the present invention, the object side or/and image side of the second lens is aspherical, so as to improve spherical aberration and off-axis aberration.

The third lens has positive refractive power, its object side is concave, and its image side is convex. Utilizing the positive refractive power of the third lens helps to gather light and correct astigmatic aberration. In this inventive embodiment, the material of the third lens is plastic, so as to reduce manufacturing cost and facilitate processing. In the embodiment of the present invention, the object side or/and image side of the third lens is aspherical, so as to improve the spherical aberration and the off-axis aberration caused by the large viewing angle.

The fourth lens has negative refractive power, its object side is convex, and its image side is concave. Utilizing the negative refractive power of the fourth lens helps to adjust the light path. Preferably, the material of the fourth lens is plastic, so as to reduce manufacturing cost and facilitate processing. In the embodiment of the present invention, the object side or/and image side of the fourth lens is aspherical, so as to correct distortion and off-axis aberration and help to adjust the angle of the chief ray incident on the imaging surface, thereby improving the relative illuminance of the image.

The combined focal length of the second lens to the fourth lens is f234, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: | f234/EFL |<250.0(1)

When the relationship (1) is satisfied, better imaging quality can be provided while maintaining the miniaturization requirements of the system, and the design flexibility of the optical imaging lens group can be improved.

The radius of curvature of the object side of the third lens is R31, and the optical effective radius of the object side of the third lens perpendicular to the optical axis is D31, which satisfies the following relationship: |R31/D31|<5.0(2).

The distance between the object side of the second lens and the image side of the three lenses on the optical axis is TT23. The object side of the third lens has an intersection with the optical axis, and the object side of the third lens has a critical point. A projection distance of the critical point on the optical axis is S31, which satisfies the following relationship: 0<TT23/S31<15.0(3).

When relational expressions (2) and (3) are satisfied, the optical imaging lens group can effectively improve the off-axis aberration of the optical imaging lens group and provide better imaging quality.

The radius of curvature of the object side of the second lens is R21, and the combined focal length of the first lens to the second lens is f12, which satisfies the following relationship: |R21/f12|<25.0 (4).

When the relationship (4) is satisfied, the imaging quality of the optical imaging lens group can be effectively improved, and the design flexibility of the optical imaging lens group can be enhanced.

The maximum image height of the optical imaging lens group is ImgH, and the total length of the optical imaging lens group is TTL, which satisfies the following relationship: 0.5<TTL/ImgH<3.5(5).

When the relationship (5) is satisfied, the miniaturization of the optical system can be effectively maintained.

The optical effective radius of the object side of the second lens perpendicular to the optical axis is D21, the object side of the second lens has an intersection point with the optical axis, and the object side of the second lens has a critical point, and the intersection point to the critical point is on the light A projection distance on the axis is S21, which satisfies the following relationship: 0<D21/S21<40.0(6).

When the relational expression (6) is satisfied, it is helpful to improve the imaging quality of the optical imaging lens group.

The radius of curvature of the image side of the second lens is R22, and the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, which satisfies the following relationship: |R22/AT23|<150.0(7).

The combined focal length from the second lens to the third lens is f23, and the combined focal length from the first lens to the second lens is f12, which satisfy the following relationship: |f23/f12|<0.6(8).

When relational expressions (7) and (8) are satisfied, the astigmatic aberration of the optical imaging lens group can be effectively improved, and the focal length range of the lens of the optical imaging lens group can be flexibly changed, so as to improve the optical imaging lens group Design flexibility.

The maximum image height ImgH of the optical imaging lens group, the distance on the optical axis from the object side of the second lens to the image side of the three lenses is TT23, which satisfies the following relationship: 0<ImgH/TT23<5.0 (9).

The optical effective radius of the second lens image side perpendicular to the optical axis is D22, the second lens image side has an intersection point with the optical axis, and the second lens image side has a critical point, and the intersection point to the critical point is on the optical axis. A projection distance on the axis is S22, and the radius of curvature of the image side of the second lens is R22, which satisfies the following relationship: |(D22/S22)*(R22/S22)|/(10 ⁴ )<9.0(10) .

When the relational expressions (9) to (10) are satisfied, the optical imaging lens group can provide better imaging quality while maintaining the miniaturization requirement of the system.

The combined focal length from the second lens to the third lens is f23, and the distance from the object side of the second lens to the image side of the three lenses on the optical axis is TT23, which satisfies the following relationship: | f23/TT23 |<20.0( 11).

When the relationship (11) is satisfied, the chromatic aberration of the optical imaging lens group can be effectively improved, and the focal length range of the lenses of the optical imaging lens group can be flexibly changed, so as to improve the design flexibility of the optical imaging lens group.

The radius of curvature of the image side of the third lens is R32, and the optical effective radius of the image side of the third lens perpendicular to the optical axis is D32, which satisfies the following relationship: |R32/D32|<2.0(12).

The combined focal length from the first lens to the third lens is f123, and the combined focal length from the second lens to the fourth lens is f234, which satisfy the following relationship: |f123/f234|<1.0(13).

When the relationship (12) and (13) are satisfied, the imaging quality of the optical imaging lens group can be effectively improved, and the focal length range of the lens of the optical imaging lens group can be flexibly changed, so as to improve the design flexibility of the optical imaging lens group Spend.

The optical effective radius of the third lens image side perpendicular to the optical axis is D32, the third lens image side has an intersection point with the optical axis, and the third lens image side has a critical point, the intersection point to the critical point on the light A projection distance on the axis is S32, which satisfies the following relationship: |D32/S32|<5.0(14).

The optical effective radius of the second lens image side perpendicular to the optical axis is D22, the optical effective radius of the third lens object side perpendicular to the optical axis is D31, and the second lens image surface is along the optical axis to the third lens object side The distance between them is AT23, which satisfies the following relationship: 1.0<(D22/AT23)+(D31/TT23)<10.0(15).

When the relational expressions (14) to (15) are satisfied, the optical imaging lens group can provide better imaging quality and help to correct the astigmatic aberration of the optical imaging lens group.

first embodiment

Referring to FIG. 1A and FIG. 1B , FIG. 1A is a schematic diagram of the optical imaging lens group of the first embodiment of the present invention. Fig. 1B shows the Astigmatism/Field Curvature, Distortion, and Longitudinal Spherical Aberration diagrams of the first embodiment of the invention in order from left to right.

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

The first lens 11 has a positive refractive power, the object side 11a is convex, the image side 11b is convex, and both the object side 11a and the image side 11b are aspherical. The material of the first lens 11 includes plastic, but not limited thereto.

The second lens 12 has a negative refractive power. The object side 12 a is concave, the image side 12 b is convex, and both the object side 12 a and the image side 12 b are aspherical. The material of the second lens 12 includes plastic, but it is not limited thereto.

The third lens 13 has positive refractive power, the object side 13 a is concave, the image side 13 b is convex, and both the object side 13 a and the image side 13 b are aspherical. The material of the third lens 13 includes plastic, but it is not limited thereto.

The fourth lens 14 has a negative refractive power, the object side 14a is convex, the image side 14b is concave, and both the object side 14a and the image side 14b are aspherical. The material of the fourth lens 14 includes plastic, but it is not limited thereto.

The filter cover assembly 15 is disposed between the fourth lens 14 and the imaging surface 16 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 15a, 15b of the filter cover assembly 15 are both flat and made of glass.

The image sensor 100 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

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

Among them, X: the distance between the point Y on the aspheric surface and the tangent plane of the aspheric surface on the optical axis; Y: the vertical distance between the point on the aspheric surface and the optical axis; C: the lens at the near optical axis The reciprocal of the radius of curvature; K: cone coefficient; and Ai: i-th order aspheric coefficient, where i=2x, and x is a natural number greater than and equal to 2, that is, i is an even number greater than and equal to 4.

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. Wherein, the object side 11a of the first lens 11 is marked as the surface 11a, and the image side 11b is marked as the surface 11b, and the other lens surfaces are deduced accordingly. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I, such as the distance from the object side 11a to the image side 11b of the first lens 11 The distance is 0.356 mm, which means the thickness of the first lens 11 is 0.356 mm. The distance from the image side 11b of the first lens 11 to the object side 12a of the second lens 12 is 0.050 mm. Others can be deduced in a similar manner, and will not be repeated below. In the first embodiment, the effective focal length of the optical imaging lens group 10 is EFL, the aperture value (F-number) is Fno, half of the maximum viewing angle of the overall optical imaging lens group 10 is HFOV (Half Field of View), and its value are also listed in Table 1.

Please refer to Table 2 below, which is the aspheric coefficient of each lens surface in the first embodiment of the present invention. Among them, 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 conic coefficient K of the object side surface 12a of the second lens 12 is -53.8. Others can be deduced in a similar manner, and will not be repeated below. In addition, the tables of the following embodiments are corresponding to the optical imaging lens groups of each embodiment, and the definitions of each table are the same as those of this embodiment, so they will not be repeated in the following embodiments.

In the first embodiment, the combined focal length of the second lens to the fourth lens is f234, the effective focal length of the optical imaging lens group is EFL, |f234/EFL|=3.84.

In the first embodiment, the radius of curvature of the object side of the third lens is R31, the optical effective radius of the object side of the third lens perpendicular to the optical axis is D31, and |R31/D31|=3.07.

In the first embodiment, the distance from the object side of the second lens to the image side of the three lenses on the optical axis is TT23, the object side of the third lens has an intersection point with the optical axis, and the object side of the third lens has a The critical point, a projected distance from the intersection point to the critical point on the optical axis is S31, TT23/S31=6.45.

In the first embodiment, the radius of curvature of the object side of the second lens is R21, the combined focal length of the first lens and the second lens is f12, and |R21/f12|=0.94.

In the first embodiment, the maximum image height of the optical imaging lens group is ImgH, the total length of the optical imaging lens group is TTL, and TTL/ImgH=1.51.

In the first embodiment, the optical effective radius of the object side of the second lens perpendicular to the optical axis is D21, the object side of the second lens has an intersection point with the optical axis, and the object side of the second lens has a critical point, and the object side of the second lens has a critical point. A projection distance from the intersection point to the critical point on the optical axis is S21, D21/S21=8.74.

In the first embodiment, the radius of curvature of the image side of the second lens is R22, and the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, |R22/AT23|=95.62.

In the first embodiment, the combined focal length from the second lens to the third lens is f23, the combined focal length from the first lens to the second lens is f12, |f23/f12|=0.45.

In the first embodiment, the maximum image height of the optical imaging lens group is ImgH, the distance on the optical axis from the object side of the second lens to the image side of the three lenses is TT23, and ImgH/TT23=2.02.

In the first embodiment, the optical effective radius of the second lens image side perpendicular to the optical axis is D22, the second lens image side has an intersection point with the optical axis, and the second lens image side has a critical point, the A projected distance from the intersection point to the critical point on the optical axis is S22, and the curvature radius of the image side of the second lens is R22, |(D22/S22)*(R22/S22)|/(10 ⁴ )=1.23.

In the first embodiment, the combined focal length from the second lens to the third lens is f23, the distance from the object side of the second lens to the image side of the three lenses on the optical axis is TT23, |f23/TT23|=1.43 .

In the first embodiment, the radius of curvature of the image side of the third lens is R32, the optical effective radius of the image side of the third lens perpendicular to the optical axis is D32, and |R32/D32|=0.65.

In the first embodiment, the combined focal length from the first lens to the third lens is f123, the combined focal length from the second lens to the fourth lens is f234, |f123/f234|=0.152.

In the first embodiment, the optical effective radius of the third lens image side perpendicular to the optical axis is D32, the third lens image side has an intersection point with the optical axis, and the third lens image side has a critical point, the A projection distance from the intersection point to the critical point on the optical axis is S32, |D32/S32|=2.05.

In the first embodiment, the optical effective radius of the second lens image side perpendicular to the optical axis is D22, the optical effective radius of the object side of the third lens perpendicular to the optical axis is D31, and the image surface of the second lens is along the optical axis. The distance to the object side of the third lens is AT23, (D22/AT23)+(D31/TT23)=3.33.

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

Referring to FIG. 1B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion diagram and longitudinal spherical aberration diagram of the optical imaging lens group 10 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.06mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 10 is less than 2.5%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 1B , the optical imaging lens group 10 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

second embodiment

Referring to FIG. 2A and FIG. 2B , FIG. 2A is a schematic diagram of the optical imaging lens group of the second embodiment of the present invention. Fig. 2B is, from left to right, the Astigmatism/Field Curvature, Distortion and Longitudinal Spherical Aberration diagrams of the second embodiment of the invention.

As shown in FIG. 2A , the optical imaging lens group 20 of the second embodiment includes a diaphragm ST, a first lens 21 , 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 imaging lens set 20 can further include a filter cover assembly 25 and an imaging surface 26 , wherein the filter cover assembly 25 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 200 can be further disposed on the imaging surface 26 to form an imaging device (not labeled otherwise).

The first lens 21 has a positive refractive power, the object side 21a is convex, the image side 21b is convex, and both the object side 21a and the image side 21b are aspherical. The material of the first lens 21 includes plastic, but it is not limited thereto.

The second lens 22 has negative refractive power. The object side 22 a is concave, the image side 22 b is convex, and both the object side 22 a and the image side 22 b are aspherical. The material of the second lens 22 includes plastic, but it is not limited thereto.

The third lens 23 has positive refractive power, the object side 23 a is concave, the image side 23 b is convex, and both the object side 23 a and the image side 23 b are aspherical. The material of the third lens 23 includes plastic, but it is not limited thereto.

The fourth lens 24 has a negative refractive power. The object side 24 a is convex, the image side 24 b is concave, and both the object side 24 a and the image side 24 b are aspherical. The material of the fourth lens 24 includes plastic, but it is not limited thereto.

The filter cover assembly 25 is disposed between the fourth lens 24 and the imaging surface 26 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 25a, 25b of the filter cover assembly 25 are both flat and made of 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).

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

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

Referring to FIG. 2B , from left to right in the figure are astigmatic field curvature aberration diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 20 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.15mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 20 is less than 2%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 2B , the optical imaging lens group 20 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

third embodiment

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

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

The first lens 31 has a positive refractive power, the object side 31a is convex, the image side 31b is convex, and both the object side 31a and the image side 31b are aspherical. The material of the first lens 31 includes plastic, but not limited thereto.

The second lens 32 has a negative refractive power, the object side 32 a is concave, the image side 32 b is concave, and both the object side 32 a and the image side 32 b are aspherical. The material of the second lens 32 includes plastic, but it is not limited thereto.

The third lens 33 has positive refractive power, the object side 33a is concave, the image side 33b is convex, and both the object side 33a and the image side 33b are aspherical. The material of the third lens 33 includes plastic, but it is not limited thereto.

The fourth lens 34 has a negative refractive power. The object side 34 a is convex, the image side 34 b is concave, and both the object side 34 a and the image side 34 b are aspherical. The material of the fourth lens 34 includes plastic, but it is not limited thereto.

The filter cover assembly 35 is disposed between the fourth lens 34 and the imaging surface 36 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 35a, 35b of the filter cover assembly 35 are both flat and made of glass.

The image sensor 300 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

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

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

Referring to FIG. 3B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 30 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.06mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 30 is less than 2.5%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 3B , the optical imaging lens group 30 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Fourth embodiment

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

As shown in FIG. 4A , the optical imaging lens group 40 of the fourth embodiment includes a first lens 41 , a diaphragm 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 imaging lens set 40 can further include a filter cover assembly 45 and an imaging surface 46 , wherein the filter cover assembly 45 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 400 can be further disposed on the imaging surface 46 to form an imaging device (not labeled otherwise).

The first lens 41 has positive refractive power, the object side 41a is convex, the image side 41b is concave, and both the object side 41a and the image side 41b are aspherical. The material of the first lens 41 includes plastic, but not limited thereto.

The second lens 42 has negative refractive power. The object side 42 a is concave, the image side 42 b is convex, and both the object side 42 a and the image side 42 b are aspherical. The material of the second lens 42 includes plastic, but not limited thereto.

The third lens 43 has positive refractive power, the object side 43a is concave, the image side 43b is convex, and both the object side 43a and the image side 43b are aspherical. The material of the third lens 43 includes plastic, but it is not limited thereto.

The fourth lens 44 has a negative refractive power. The object side 44 a is convex, the image side 44 b is concave, and both the object side 44 a and the image side 44 b are aspherical. The material of the fourth lens 44 includes plastic, but not limited thereto.

The filter cover assembly 45 is disposed between the fourth lens 44 and the imaging surface 46 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 45a, 45b of the filter cover assembly 45 are both flat and made of glass.

The image sensor 400 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

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

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

Referring to FIG. 4B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 40 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.03mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.12mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 40 is less than 2.5%. It can be seen from the longitudinal spherical aberration diagram that three kinds of off-axis light with wavelengths of 470nm, 555nm and 650nm at different heights The lines can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.05mm. As shown in FIG. 4B , the optical imaging lens group 40 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

fifth embodiment

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

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

The first lens 51 has positive refractive power, the object side 51a is convex, the image side 51b is concave, and both the object side 51a and the image side 51b are aspherical. The material of the first lens 51 includes plastic, but it is not limited thereto.

The second lens 52 has negative refractive power. The object side 52 a is concave, the image side 52 b is convex, and both the object side 52 a and the image side 52 b are aspherical. The material of the second lens 52 includes plastic, but not limited thereto.

The third lens 53 has positive refractive power, the object side 53a is concave, the image side 53b is convex, and both the object side 53a and the image side 53b are aspherical. The material of the third lens 53 includes plastic, but it is not limited thereto.

The fourth lens 54 has a negative refractive power. The object side 54 a is convex, the image side 54 b is concave, and both the object side 54 a and the image side 54 b are aspherical. The material of the fourth lens 54 includes plastic, but not limited thereto.

The filter cover assembly 55 is disposed between the fourth lens 54 and the imaging surface 56 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 55a, 55b of the filter cover assembly 55 are both flat and made of 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).

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

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

Referring to FIG. 5B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 50 . From the astigmatism field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction is within ±0.02mm in the entire field of view; Aberrations vary within ±0.15mm over the entire field of view. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 50 is less than 2.5%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 5B , the optical imaging lens group 50 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Sixth embodiment

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

As shown in FIG. 6A , the optical imaging lens group 60 of the sixth embodiment includes a first lens 61 , a diaphragm 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 imaging lens set 60 can further include a filter cover assembly 65 and an imaging surface 66 , wherein the filter cover assembly 65 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 600 can be further disposed on the imaging surface 66 to form an imaging device (not otherwise labeled).

The first lens 61 has positive refractive power, the object side 61a is convex, the image side 61b is concave, and both the object side 61a and the image side 61b are aspherical. The material of the first lens 61 includes plastic, but not limited thereto.

The second lens 62 has a negative refractive power, the object side 62 a is concave, the image side 62 b is concave, and both the object side 62 a and the image side 62 b are aspherical. The material of the second lens 62 includes plastic, but not limited thereto.

The third lens 63 has positive refractive power, the object side 63a is concave, the image side 63b is convex, and both the object side 63a and the image side 63b are aspherical. The material of the third lens 63 includes plastic, but it is not limited thereto.

The fourth lens 64 has a negative refractive power. The object side 64 a is convex, the image side 64 b is concave, and both the object side 64 a and the image side 64 b are aspherical. The material of the fourth lens 64 includes plastic, but it is not limited thereto.

The filter cover assembly 65 is disposed between the fourth lens 64 and the imaging surface 66 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 65a, 65b of the filter cover assembly 65 are both flat and made of glass.

The image sensing device 600 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 60 of the sixth embodiment are listed in Table 12 and Table 13, respectively. In the sixth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment.

In the sixth embodiment, the values of the relational expressions of the optical imaging lens group 60 are listed in Table 14. It can be known from Table 14 that the optical imaging lens group 60 of the sixth embodiment satisfies the requirements of relational expressions (1) to (15).

表十四

Table Fourteen

Referring to FIG. 6B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 60 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.06mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 60 is less than 2%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 6B , the optical imaging lens group 60 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Seventh embodiment

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

As shown in FIG. 7A , the optical imaging lens group 70 of the seventh embodiment includes a first lens 71 , a diaphragm 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 imaging lens set 70 can further include a filter cover assembly 75 and an imaging surface 76 , wherein the filter cover assembly 75 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 700 can be further disposed on the imaging surface 76 to form an imaging device (not otherwise labeled).

The first lens 71 has a positive refractive power, the object side 71a is convex, the image side 71b is concave, and both the object side 71a and the image side 71b are aspherical. The material of the first lens 71 includes plastic, but it is not limited thereto.

The second lens 72 has a negative refractive power, the object side 72a is concave, the image side 72b is concave, and both the object side 72a and the image side 72b are aspherical. The material of the second lens 72 includes plastic, but not limited thereto.

The third lens 73 has a positive refractive power, the object side 73a is concave, the image side 73b is convex, and both the object side 73a and the image side 73b are aspherical. The material of the third lens 73 includes plastic, but it is not limited thereto.

The fourth lens 74 has a negative refractive power. The object side 74 a is convex, the image side 74 b is concave, and both the object side 74 a and the image side 74 b are aspherical. The material of the fourth lens 74 includes plastic, but it is not limited thereto.

The filter cover assembly 75 is disposed between the fourth lens 74 and the imaging surface 76 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 75a, 75b of the filter cover assembly 75 are both flat and made of glass.

The image sensor 700 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 70 of the seventh embodiment are listed in Table 12 and Table 13, respectively. In the seventh embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment.

In the seventh embodiment, the values of the relational expressions of the optical imaging lens group 70 are listed in the table fourteen. It can be seen from Table 14 that the optical imaging lens group 70 of the seventh embodiment satisfies the requirements of relational expressions (1) to (15).

Referring to FIG. 7B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 70 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.03mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.15mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 70 is less than 2%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.025mm. As shown in FIG. 7B , the optical imaging lens group 70 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Eighth embodiment

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

As shown in FIG. 8A , the optical imaging lens group 80 of the eighth embodiment includes a first lens 81 , a diaphragm 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 imaging lens set 80 can further include a filter cover assembly 85 and an imaging surface 86 , wherein the filter cover assembly 85 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 800 can be further disposed on the imaging surface 86 to form an imaging device (not otherwise labeled).

The first lens 81 has positive refractive power, the object side 81a is convex, the image side 81b is concave, and both the object side 81a and the image side 81b are aspherical. The material of the first lens 81 includes plastic, but not limited thereto.

The second lens 82 has a negative refractive power. The object side 82 a is convex, the image side 82 b is concave, and both the object side 82 a and the image side 82 b are aspherical. The material of the second lens 82 includes plastic, but not limited thereto.

The third lens 83 has positive refractive power, the object side 83a is concave, the image side 83b is convex, and both the object side 83a and the image side 83b are aspherical. The material of the third lens 83 includes plastic, but not limited thereto.

The fourth lens 84 has a negative refractive power, the object side 84a is convex, the image side 84b is concave, and both the object side 84a and the image side 84b are aspherical. The material of the fourth lens 84 includes plastic, but not limited thereto.

The filter cover assembly 85 is disposed between the fourth lens 84 and the imaging surface 86 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 85a, 85b of the filter cover assembly 85 are both flat and made of 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).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 80 of the eighth embodiment are listed in Table 12 and Table 13, respectively. In the eighth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment.

表十三

Table 13

In the eighth embodiment, the values of the relational expressions of the optical imaging lens group 80 are listed in Table 14. It can be known from Table 14 that the optical imaging lens group 80 of the eighth embodiment satisfies the requirements of relational expressions (1) to (15).

Referring to FIG. 8B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 80 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.06mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 80 is less than 2%. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of three kinds of visible light wavelengths of 470nm, 555nm, and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. As shown in FIG. 8B , the optical imaging lens group 50 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Ninth embodiment

Referring to FIG. 9A and FIG. 9B , FIG. 9A is a schematic diagram of an optical imaging lens group according to a ninth embodiment of the present invention. FIG. 9B is, from left to right, the Astigmatism/Field Curvature, Distortion, and Longitudinal Spherical Aberration diagrams of the ninth embodiment of the invention.

As shown in FIG. 9A , the optical imaging lens group 90 of the ninth embodiment includes a diaphragm ST, a first lens 91 , a second lens 92 , a third lens 93 , and a fourth lens 94 sequentially from the object side to the image side. The optical imaging lens set 90 can further include a filter cover assembly 95 and an imaging surface 96 , wherein the filter cover assembly 95 can include a filter element (not shown in the figure) and a protective glass (not shown in the figure). An image sensing element 900 can be further disposed on the imaging surface 96 to form an imaging device (not labeled otherwise).

The first lens 91 has a positive refractive power, the object side 91a is convex, the image side 91b is convex, and both the object side 91a and the image side 91b are aspherical. The material of the first lens 91 includes plastic, but not limited thereto.

The second lens 92 has a negative refractive power. The object side 92 a is convex, the image side 92 b is concave, and both the object side 92 a and the image side 92 b are aspherical. The material of the second lens 92 includes plastic, but not limited thereto.

The third lens 93 has positive refractive power, the object side 93a is concave, the image side 93b is convex, and both the object side 93a and the image side 93b are aspherical. The material of the third lens 93 includes plastic, but not limited thereto.

The fourth lens 94 has a negative refractive power, the object side 94a is convex, the image side 94b is concave, and both the object side 94a and the image side 94b are aspherical. The material of the fourth lens 94 includes plastic, but not limited thereto.

The filter cover assembly 95 is disposed between the fourth lens 94 and the imaging surface 96 to filter out light in a specific wavelength range, such as an infrared light filter element. The two surfaces 95a, 95b of the filter cover assembly 95 are both flat and made of glass.

The image sensor 900 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Image Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 90 of the ninth embodiment are listed in Table 15 and Table 16, respectively. In the ninth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment.

In the ninth embodiment, the values of the relational expressions of the optical imaging lens group 90 are listed in Table 17. It can be seen from Table 17 that the optical imaging lens group 90 of the ninth embodiment satisfies the requirements of relational expressions (1) to (15).

Referring to FIG. 9B , from left to right in the figure are the astigmatism field curve diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 90 . From the astigmatism and field curvature aberration diagram (wavelength 555nm), it can be seen that the variation of the aberration in the sagittal direction within the entire field of view is within ±0.06mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.15mm. From the F-tanθ distortion aberration diagram (wavelength 555nm), it can be seen that the absolute value of the F-tanθ distortion rate of the optical imaging lens group 30 is less than 2%. by longitudinal ball It can be seen from the difference diagram that the off-axis rays of the three kinds of visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. As shown in FIG. 3B , the optical imaging lens group 30 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system.

Tenth embodiment

Referring to FIG. 10, an imaging device 1010 includes the optical imaging lens groups 10, 20, 30, 40, 50, 60, 70, 80, 90 of the aforementioned first to ninth embodiments, and an image sensing element 100, 200, 300, 400, 500, 600, 700, 800, 900; wherein, the image sensing elements 100, 200, 300, 400, 500, 600, 700, 800, 900 are arranged in the optical imaging lens group 10, 20, 30, 40, 50, 60, 70, 80, 90 on the imaging plane 16, 26, 36, 46, 56, 66, 76, 86, 96. The image sensing elements 100, 200, 300, 400, 500, 600, 700, 800, 900 are, for example, charge-coupled devices (Charge-Coupled Device, CCD) or complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) image sensors. Measuring components, etc.

In FIG. 10 , an electronic device 1000 according to the tenth embodiment of the present invention includes an imaging device 1010 , wherein the electronic device 1000 can be applied to general 3C products and other electronic products with imaging functions.

Although the invention is described using the aforementioned several embodiments, these embodiments are not intended to limit the scope of the invention. For anyone familiar with this technique, without departing from the spirit and scope of this creation, various changes in form and details can still be made with reference to the embodiments disclosed in this creation. Therefore, what needs to be understood here is that this creation is subject to the scope of the following patent application, and any changes made within the scope of the patent application or its equivalent scope should still fall into the application of this creation within the scope of the patent.

10: Optical imaging lens group

11: First lens

12: Second lens

13: Third lens

14: Fourth lens

15:Filter cover assembly

16: Imaging surface

11a: The side of the object of the first lens

11b: The image side of the first lens

12a: The side of the second lens

12b: The image side of the second lens

13a: The side of the third lens

13b: The image side of the third lens

14a: The side of the fourth lens

14b: The image side of the fourth lens

15a, 15b: the two surfaces of the filter cover assembly

100: Image sensing element

I: optical axis

ST: Aperture

Claims (17)

An optical imaging lens group sequentially includes from the object side to the image side: a first lens with refractive power; a second lens with refractive power; a third lens having refractive power; and a fourth lens with refractive power; Wherein, the total number of lenses in the optical imaging lens group is four; at least one of the first lens to the fourth lens has positive refractive power, the combined focal length of the second lens to the fourth lens is f234, the The effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: ∣f234/EFL∣ < 250.0. For example, the optical imaging lens group of item 1 of the scope of application, wherein the radius of curvature of the object side of the third lens is R31, and the optical effective radius of the object side of the third lens perpendicular to the optical axis is D31, which satisfies the following relationship : ∣R31/D31∣ < 5.0. Such as the optical imaging lens group of item 1 of the scope of the patent application, wherein the distance between the object side of the second lens and the image side of the three lenses on the optical axis is TT23, and the object side of the third lens has an intersection with the optical axis, And the object side of the third lens has a critical point, and a projection distance from the intersection point to the critical point on the optical axis is S31, which satisfies the following relationship: 0<TT23/S31<15.0. For example, the optical imaging lens group of item 1 of the scope of the patent application, wherein the radius of curvature of the object side of the second lens is R21, and the combined focal length of the first lens to the second lens is f12, which satisfies the following relationship:∣ R21/f12∣ < 25.0. For example, the optical imaging lens group of item 1 of the patent scope, wherein the maximum image height of the optical imaging lens group is ImgH, the total length of the optical imaging lens group is TTL, and the following relationship is satisfied: 0.5<TTL/ImgH <3.5. An optical imaging lens group sequentially includes from the object side to the image side: A first lens with refractive power, and its object side surface is convex; a second lens with refractive power; a third lens having refractive power; and a fourth lens with refractive power; Wherein, the total number of lenses in the optical imaging lens group is four; the first lens and the third lens have positive or negative refractive power, and the optical effective radius of the object side of the second lens perpendicular to the optical axis is D21 , the object side of the second lens has an intersection with the optical axis, and the object side of the second lens has a critical point, and a projected distance from the intersection to the critical point on the optical axis is S21, which satisfies the following relationship: 0 < D21/S21 < 40.0. Such as the optical imaging lens group of item 6 of the scope of application, wherein the radius of curvature of the image side of the second lens is R22, and the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, which is AT23. Satisfy the following relationship: ∣R22/AT23∣ < 150.0. Such as the optical imaging lens group of item 6 of the scope of application, wherein the combined focal length from the second lens to the third lens is f23, and the combined focal length from the first lens to the second lens is f12, which satisfy the following relationship Formula: ∣f23/f12∣ < 0.6. Such as the optical imaging lens group of item 6 of the patent scope, wherein, the maximum image height of the optical imaging lens group is ImgH, and the distance from the object side of the second lens to the image side of the three lenses on the optical axis is TT23, which is TT23. Satisfy the following relationship: 0 < ImgH/TT23 < 5.0. Such as the optical imaging lens group of item 6 of the scope of the patent application, wherein the optical effective radius of the second lens image side perpendicular to the optical axis is D22, the second lens image side and the optical axis have an intersection, and the second lens There is a critical point on the side of the lens image, a projection distance from the intersection point to the critical point on the optical axis is S22, and the radius of curvature of the second lens image side is R22, which satisfies the following relationship: |(D22/S22)* (R22/S22)∣/(10 ⁴ ) < 9.0. An optical imaging lens group sequentially includes from the object side to the image side: a first lens with refractive power; a second lens with refractive power; a third lens having refractive power; and a fourth lens with negative refractive power; Wherein, the total number of lenses in the optical imaging lens group is four; the first lens and the third lens have positive refractive power or negative refractive power, the combined focal length of the second lens to the third lens is f23, the The distance on the optical axis from the object side of the second lens to the image side of the three lenses is TT23, which satisfies the following relationship: ∣ f23/TT23∣ < 20.0. For example, the optical imaging lens group of item 11 of the scope of the patent application, wherein the radius of curvature of the third lens image side is R32, and the optical effective radius of the third lens image side perpendicular to the optical axis is D32, which satisfies the following relationship : ∣R32/D32∣ < 2.0. For example, the optical imaging lens group of claim 11 of the scope of application, wherein the combined focal length from the first lens to the third lens is f123, and the combined focal length from the second lens to the fourth lens is f234, which satisfy the following relationship Formula: ∣f123/f234∣ < 1.0. Such as the optical imaging lens group of item 11 of the patent scope, wherein, the optical effective radius of the image side of the third lens perpendicular to the optical axis is D32, the image side of the third lens has an intersection with the optical axis, and the third lens There is a critical point on the side of the lens image, and a projected distance from the intersection point to the critical point on the optical axis is S32, which satisfies the following relationship: |D32/S32|<5.0. For example, the optical imaging lens group of item 11 of the scope of application, wherein the optical effective radius of the second lens image side perpendicular to the optical axis is D22, and the optical effective radius of the third lens object side perpendicular to the optical axis is D31, The distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, which satisfies the following relationship: 1.0<(D22/AT23)+(D31/TT23)<10.0. An imaging device, which includes the optical imaging lens group as claimed in item 1, item 6 or item 11 of the scope of the patent application and an image sensing element, wherein the image sensing element is arranged on the optical imaging lens group imaging surface. An electronic device, which includes the imaging device described in claim 16 of the patent application.

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