TWI809914B - 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 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 concave; the third lens has positive refractive power and includes an object-side surface being convex; the fourth lens has negative refractive power; the fifth lens has positive refractive power and includes an image-side surface being convex. When specific conditions are satisfied, the optical imaging lens can have good thermal stability and good imaging qualities.

Description

Optical camera lens group, imaging device and electronic device

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

With the improvement of the manufacturing level of photographic imaging devices, their application fields are becoming more and more diverse, such as mobile devices, drones, and vehicle devices. Take the vehicle device as an example. In the early days, an external driving recorder was connected to the vehicle power supply. When the vehicle starts, the driving recorder will automatically turn on and start recording the traffic conditions within the field of vision; in recent years, in order to improve the safety of vehicles, Relevant companies have gradually invested in the development of self-driving cars, that is, installing various sensors on the vehicles to detect the state of the environment. Among them, in addition to being used to record traffic conditions, the optical lens can also cooperate with image recognition and intelligent computing to improve the driving safety and comfort of vehicles in various environments; for example, the use of image recognition and The optical photography equipment with intelligent computing function can be used to monitor the state of driving concentration, avoid driving eyes from leaving the front of the vehicle, or provide instant warning reminders when the driving mental state is not good, thereby improving the safety of driving vehicles.

In addition, users not only require clear imaging, but also require a wider field of view and good thermal stability to meet the needs of various climates and driving environments. Therefore, how to provide an optical imaging device with good imaging quality and resistance to environmental temperature changes has become a problem that people in this technical field want to solve urgently.

AT34/AT45

29.00；及｜(1/f1)+(1/f3)｜*EFL

0.20。 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, a fourth lens and a fifth lens from the object side to the image side. Among them, the first lens has negative refraction power, and its image side is concave; the second lens has positive refraction power, and its object side is concave; the third lens has positive refraction power, and its object side is convex; the fourth lens has negative refraction Power; the fifth lens has a positive refractive power, and its image side is convex. The total number of lenses in this optical imaging lens group is five pieces; the distance from the third lens image side to the fourth lens object side along the optical axis is AT34, and the distance from the fourth lens image side to the fifth lens object side along the optical axis The distance is AT45, the focal length of the first lens is f1, the focal length of the third lens is f3, and the effective focal length of the optical camera lens group is EFL, which satisfies the following relationship: 2.00

AT34/AT45

29.00; and |(1/f1)+(1/f3)|*EFL

0.20.

1.5。 According to an embodiment of the present invention, the radius of curvature of the image side of the fourth lens is R8, and the radius of curvature of the object side of the fifth lens is R9, which satisfy the following relationship: |R8/R9|

1.5.

R7/R8

3.00。 The present invention further provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side. Among them, the first lens has negative refraction power, and its image side is concave; the second lens has positive refraction power, and its object side is concave; the third lens has positive refraction power, and its image side is convex; the fourth lens has negative refraction Power; the fifth lens has a positive refractive power, and its object side is convex. The total number of lenses in the optical imaging lens group is five pieces; the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfies the following relationship: 0.20

R7/R8

3.00.

AT23/TTL

0.30。 According to an embodiment of the present invention, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the total length of the optical imaging lens group is TTL, which satisfies the following relationship: 0.10

AT23/TTL

0.30.

(AT34+AT45)/CT4

5.00。 According to an embodiment of the present invention, the distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45. The thickness of the fourth lens along the optical axis is CT4, which satisfies the following relationship: 2.00

(AT34+AT45)/CT4

5.00.

AT23/AT45

97.0。 According to an embodiment of the present invention, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45. Satisfy the following relationship: 14.0

AT23/AT45

97.0.

(AT34+AT45)/AT23

0.40。 According to an embodiment of the present invention, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34. The distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45, which satisfies the following relationship: 0.20

(AT34+AT45)/AT23

0.40.

｜(N1*V1/f1)+(N3*V3/f3)｜

6.50。 According to an embodiment of the present invention, the focal length of the first lens is f1, the focal length of the third lens is f3, the refractive index of the first lens is N1, the refractive index of the third lens is N3, and the refractive index of the first lens is The dispersion coefficient is V1, and the dispersion coefficient of the third lens is V3, which satisfies the following relationship: 3.00

｜(N1*V1/f1)+(N3*V3/f3)｜

6.50.

20.0及｜R1/R2｜

15.0。 According to an embodiment of the present invention, the radius of curvature of the image side of the third lens is R6, the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the object side of the first lens is R1, and the first lens The radius of curvature of the side of the image is R2, which satisfies at least one of the following relations: |R6/R7|

20.0 and｜R1/R2｜

15.0.

ImgH/EFL

1.20。 According to an embodiment of the present invention, the maximum image height ImgH of the optical imaging lens group, the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 0.90

ImgH/EFL

1.20.

D2/R2

0.90。 According to an embodiment of the present invention, the radius of the image side of the first lens perpendicular to the optical axis is D2, and the radius of curvature of the image side of the first lens is R2, which satisfies the following relationship: 0.60

D2/R2

0.90.

According to an embodiment of the present invention, the object side surface of the first lens is convex at the paraxial position.

According to an embodiment of the present invention, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfy the following relationship: 0<R7*R8.

According to an embodiment of the present invention, the object side of the fourth lens is concave at the paraxial position.

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 arranged on the imaging surface of the optical imaging lens group.

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

10, 20, 30, 40, 50: optical camera lens group

11, 21, 31, 41, 51: the first lens

12, 22, 32, 42, 52: second lens

13, 23, 33, 43, 53: third lens

14, 24, 34, 44, 54: fourth lens

15, 25, 35, 45, 55: fifth lens

16, 26, 36, 46, 56: filter element

17, 27, 37, 47, 57: protective glass

18, 28, 38, 48, 58: imaging surface

11a, 21a, 31a, 41a, 5la: the object side of the first lens

11b, 21b, 31b, 41b, 51b: image side of the first lens

12a, 22a, 32a, 42a, 52a: the object side of the second lens

12b, 22b, 32b, 42b, 52b: the image side of the second lens

13a, 23a, 33a, 43a, 53a: the object side of the third lens

13b, 23b, 33b, 43b, 5 and: the image side of the third lens

14a, 24a, 34a, 44a, 54a: the object side of the fourth lens

14b, 24b, 34b, 44b, 54b: the image side of the fourth lens

15a, 25a, 35a, 45a, 55a: the object side of the fifth lens

15b, 25b, 35b, 45b, 55b: image side of the fifth lens

16a, 16b, 26a, 26b, 36a, 36b, 46a, 46b, 56a, 56b: two surfaces of the filter element

17a, 17b, 27a, 27b, 37a, 37b, 47a, 47b, 57a, 57b: two surfaces of protective glass

100, 200, 300, 400, 500: 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 of the first embodiment of the present invention; [Fig. 1B] is the astigmatic field curvature diagram, distortion diagram and longitudinal spherical aberration diagram of the first embodiment of the present invention in sequence from left to right; [ 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 astigmatic field curvature diagram, distortion diagram and longitudinal spherical aberration diagram of the second embodiment of the present invention; [Fig. 3A) is a schematic diagram of the optical imaging lens group of the third embodiment of the present invention; [Fig. 3B] from left to right is the astigmatic field curvature diagram, distortion diagram and longitudinal spherical aberration diagram of the third embodiment of the present invention; [Fig. 4A] is a schematic diagram of the optical imaging lens group of the fourth embodiment of the present invention; [ Fig. 4B] from left to right is the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the fourth embodiment of the present invention; [Fig. 5A] is a schematic diagram of the optical imaging lens group of the fifth embodiment of the present invention; [Fig. 5B] From left to right are the astigmatism field diagram, distortion diagram and longitudinal spherical aberration diagram of the fifth embodiment of the present invention; [Fig. 6] is a schematic diagram of the vehicle electronic device of the sixth embodiment of the present 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 camera lens group, thereby prolonging the optical camera. The service life of the lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical camera lens group and reduce the production cost.

In an 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 (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). Each lens is close The shape at the axis is judged by whether the radius of curvature of the surface is positive or negative. For example, if the radius of curvature of the side of a lens is positive, the side of the object is convex; otherwise, if the radius of curvature is negative value, 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 an embodiment of the present invention, the object side and the image side of each lens may be spherical or aspheric surfaces. Using an aspheric surface on the lens helps to correct imaging aberrations of the optical camera lens group such as spherical aberration, and reduces the number of optical lens elements used. However, the use of aspheric lenses will increase the cost of the overall optical camera lens assembly. Although in the embodiments of the present invention, some optical lenses use spherical surfaces, they can still be designed as aspheric surfaces as required; or, some optical lenses use aspheric surfaces, but they can still be designed as aspheric surfaces as required. Design it as a spherical surface.

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

The first lens has negative refractive power, its image side is concave, and its object side can be convex or concave, so as to meet the actual application requirements and help to collect light. Preferably, the material of the first lens is glass Glass, suitable for environmental conditions with large temperature differences. In an embodiment of the present invention, the object side or/and the image side of the first lens are spherical to reduce manufacturing cost and facilitate processing.

The second lens has positive refractive power and is used to adjust the light path. The object side of the second lens is concave, and the image side is convex. Preferably, the material of the second lens is plastic, so as to reduce manufacturing cost and facilitate processing. In addition, the object side or/and the image side of the second lens can be aspherical, so as to improve spherical aberration.

The third lens has positive refractive power, its object side is convex, and its image side is convex. Utilizing the positive refractive power of the third lens helps to gather light and correct astigmatic aberration. By adjusting the relationship between the air gap between the third lens and the fourth lens and other optical parameters, the thermal drift of the focal plane of the optical imaging lens group can be effectively compensated, and the thermal stability can be improved. In the embodiment of the present invention, the material of the third lens is glass, which is applicable to the environmental conditions with large temperature difference. In an embodiment of the present invention, the object side or/and the image side of the third lens are spherical to reduce manufacturing cost and facilitate processing.

The fourth lens has negative refractive power. The object side and the image side of the fourth lens can be convex or concave respectively. 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 addition, the object side or/and the image side of the fourth lens can be aspherical, so as to improve spherical aberration.

The fifth lens has positive refractive power. The object side of the fifth lens is convex, and its image side is concave. Utilizing the positive refractive power of the fifth lens helps to gather light and improve astigmatic aberration. Preferably, the material of the fourth lens is plastic, so as to reduce manufacturing cost and facilitate processing. In addition, the object side or/and the image side of the fourth lens can be aspherical, so as to improve spherical aberration.

AT34/AT45

29.00 (1)。 The distance from the third lens image side to the object side of the fourth lens along the optical axis is AT34, and the distance from the fourth lens image surface to the object side of the fifth lens along the optical axis is AT45, which satisfies the following relationship: 2.00

AT34/AT45

29.00 (1).

When the relationship (1) is satisfied, the thermal drift of the optical imaging lens group can be effectively improved, and the design flexibility of the optical imaging lens group can be enhanced.

1.5 (2)。 The radius of curvature of the image side of the fourth lens is R8, and the radius of curvature of the object side of the fifth lens is R9, which satisfy the following relationship: |R8/R9|

1.5 (2).

0.20 (3)。 The focal length of the first lens is f1, the focal length of the third lens is f3, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: |(1/f1)+(1/f3)|*EFL

0.20 (3).

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

R7/R8

3.00 (4)。 The radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfies the following relationship: 0.20

R7/R8

3.00 (4).

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

AT23/TTL

0.30 (5)。 The distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the total length of the optical imaging lens group is TTL, which satisfies the following relationship: 0.10

AT23/TTL

0.30 (5).

When the relationship (5) is satisfied, the thermal stability of the optical imaging lens group can be improved by adjusting the ratio between AT23 and TTL.

(AT34+AT45)/CT4

5.00 (6)。 The distance from the third lens image side to the object side of the fourth lens along the optical axis is AT34, and the distance from the fourth lens to the object side of the fifth lens along the optical axis is AT45. The thickness is CT4, which satisfies the following relationship: 2.00

(AT34+AT45)/CT4

5.00 (6).

When the relationship (6) is satisfied, the optical imaging lens group can provide better imaging quality.

AT23/AT45

97.0 (7)。 The distance between the image side of the second lens along the optical axis and the object side of the third lens is AT23, and the distance between the image side of the fourth lens and the object side of the fifth lens along the optical axis is AT45, which satisfies the following relationship: 14.0

AT23/AT45

97.0 (7).

(AT34+AT45)/AT23

0.40 (8)。 The distance from the second lens image side to the third lens object side along the optical axis is AT23, and the distance from the third lens image to the fourth lens object side along the optical axis is AT34. The distance from the axis to the object side of the fifth lens is AT45, which satisfies the following relationship: 0.20

(AT34+AT45)/AT23

0.40 (8).

When the relational expressions (7) and (8) are satisfied, the range of the air gap between 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.

｜(N1*V1/f1)+(N3*V3/f3)｜

6.50 (9)。 The focal length of the first lens is f1, the focal length of the third lens is f3, the refractive index of the first lens is N1, the refractive index of the third lens is N3, the dispersion coefficient of the first lens is V1, and the first lens has a refractive index of N3. The dispersion coefficient of the three lenses is V3, which satisfies the following relationship: 3.00

｜(N1*V1/f1)+(N3*V3/f3)｜

6.50 (9).

When the relational expression (9) is satisfied, the thermal stability and imaging quality of the optical imaging lens group can be improved by adjusting the material type and focal length of the first lens and the third lens.

20.0 (10)。 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 satisfy at least one of the following relational expressions: |R6/R7|

20.0 (10).

15.0 (11)。 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 first lens is R2, which satisfy at least one of the following relational expressions: |R1/R2|

15.0 (11).

ImgH/EFL

1.20 (12)。 The maximum image height ImgH of this optical imaging lens group, the effective focal length of this optical imaging lens group is EFL, is to satisfy following relational expression: 0.90

ImgH/EFL

1.20 (12).

D2/R2

0.90 (13)。 The radius of the image side of the first lens perpendicular to the optical axis is D2, and the radius of curvature of the image side of the first lens is R2, which satisfies the following relationship: 0.60

D2/R2

0.90 (13).

The radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfy the following relationship: 0<R7*R8 (14).

When the relational expressions (10) to (14) are satisfied, the optical imaging lens group can provide better imaging quality and help to correct the coma aberration of the optical imaging lens group.

first embodiment

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

As shown in Figure 1A, the optical imaging lens group 10 of the first embodiment includes a first lens 11, a second lens 12, a third lens 13, an aperture ST, a fourth lens 14 and a fifth lens in sequence from the object side to the image side. Lens 15. The optical imaging lens group 10 can further include a filter element 16 , a protective glass 17 and an imaging surface 18 . An image sensing element 100 can be further disposed on the imaging surface 18 to form an imaging device (not otherwise labeled).

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

The second lens 12 has positive refractive power, the object side 12a is concave, the image side 12b is convex, and both the object side 12a and the image side 12b are aspherical. The material of the second lens 12 is plastic.

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

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

The fifth lens 15 has positive refractive power, the object side 15a is convex, the image side 15b is convex, and both the object side 15a and the image side 15b are aspherical. The material of the fifth lens 15 is plastic.

The filter element 16 is disposed between the fifth lens 15 and the imaging surface 18 to filter out light in a specific wavelength range, such as an infrared filter element. The two surfaces 16a, 16b of the filter element 16 are both flat and made of glass.

The protective glass 17 is disposed between the filter element 16 and the imaging surface 18 to protect the imaging surface 18 . The two surfaces 17a, 17b of the protective glass 17 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 according to 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 on the optical axis I from the surface to the next surface. For example, the distance from the object side 11a of the first lens 11 to the image side 11b is 1.000 mm, which means that the thickness of the first lens 11 is 1.000 mm. mm. The image side 11b of the first lens 11 The distance to the object side surface 12a of the second lens 12 is 3.137 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 numerical value is also listed in Table 1.

Please refer to Table 2 below, which shows the aspheric coefficients 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 order aspheric coefficients of each surface. For example, the conic coefficient K of the object side surface 12a of the second lens 12 is -14.7. 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 distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45, AT34 /AT45=28.29.

In the first embodiment, the radius of curvature of the image side of the fourth lens is R8, the radius of curvature of the object side of the fifth lens is R9, |R8/R9|=1.00.

In the first embodiment, the focal length of the first lens is f1, the focal length of the third lens is f3, the effective focal length of the optical imaging lens group is EFL, |(1/f1)+(1/f3)|* EFL=0.15.

In the first embodiment, the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, and R7/R8=0.29.

In the first embodiment, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, the total length of the optical imaging lens group is TTL, and AT23/TTL=0.22.

In the first embodiment, the distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45. The thickness of the fourth lens along the optical axis is CT4, (AT34+AT45)/CT4=3.27.

In the first embodiment, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45, AT23 /AT45=96.68.

In the first embodiment, the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34. The distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45, (AT34+AT45)/AT23=0.30.

In the first embodiment, the focal length of the first lens is f1, the focal length of the third lens is f3, the refractive index of the first lens is N1, and the refractive index of the third lens is N3. The dispersion coefficient is V1, the dispersion coefficient of the third lens is V3, |(N1*V1/f1)+(N3*V3/f3)|=5.27.

In the first embodiment, the radius of curvature of the image side of the third lens is R6, the radius of curvature of the object side of the fourth lens is R7, |R6/R7|=7.37.

In the first embodiment, the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the first lens is R2, |R1/R2|=11.59.

In the first embodiment, the maximum image height of the optical imaging lens group is ImgH, the effective focal length of the optical imaging lens group is EFL, and ImgH/EFL=1.11.

In the first embodiment, the radius of the image side of the first lens perpendicular to the optical axis is D2, the radius of curvature of the image side of the first lens is R2, and D2/R2=0.86.

In the first embodiment, the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, and R7*R8=9.91.

It can be seen from the values of the above relational expressions that the optical imaging lens assembly 10 of the first embodiment satisfies the requirements of the relational expressions (1) to (14).

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 . It can be seen from the longitudinal spherical aberration diagram that the three kinds of off-axis rays with 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 ±0.06mm. 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 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. 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 an optical imaging lens group according to a second embodiment of the present invention. 2B is, from left to right, the Astigmatism/Field Curvature, Distortion, and Longitudinal Spherical Aberration diagrams of the second embodiment of the present invention.

As shown in Figure 2A, the optical imaging lens group 20 of the second embodiment includes a first lens 21, a second lens 22, a third lens 23, a diaphragm ST, a fourth lens 24 and a fifth lens in sequence from the object side to the image side. Lens 25. The optical camera lens group 20 can further include a filter element 26 , a protective glass 27 and an imaging surface 28 . An image sensing element 200 can be further disposed on the imaging surface 28 to form an imaging device (not labeled otherwise).

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

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

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

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

The fifth lens 25 has a positive refractive power, its object side 25 a is convex, and its image side 25 b is convex, and both the object side 25 a and the image side 25 b are aspherical. The material of the fifth lens 25 is plastic.

The filter element 26 is disposed between the fifth lens 25 and the imaging surface 28 to filter out light in a specific wavelength range, such as an infrared filter element. The two surfaces 26a, 26b of the filter element 26 are both flat and made of glass.

The protective glass 27 is disposed between the filter element 26 and the imaging surface 28 to protect the imaging surface 28 . The two surfaces 27a and 27b of the protective glass 27 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 seen from Table 5 that the optical imaging lens group 20 of the second embodiment satisfies the requirements of relational expressions (1) to (14).

Referring to FIG. 2B , from left to right in the figure are the astigmatic field curvature aberration diagram, F-tanθ distortion aberration diagram and longitudinal spherical aberration diagram of the optical imaging lens group 20 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible 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 ±0.05mm. 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 10.0%. 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 ±0.05mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.07mm. 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 present invention.

As shown in Figure 3A, the optical imaging lens group 30 of the third embodiment includes a first lens 31, a second lens 32, a third lens 33, an aperture ST, a fourth lens 34 and a fifth lens in sequence from the object side to the image side. Lens 35. The optical camera lens group 30 can further include a filter element 36 , a protective glass 37 and an imaging surface 38 . An image sensing element 300 can be further disposed on the imaging surface 38 to form an imaging device (not labeled otherwise).

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

The second lens 32 has positive refractive power, the object side 32a is concave, the image side 32b is convex, and both the object side 32a and the image side 32b are aspherical. The material of the second lens 32 is plastic.

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

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

The fifth lens 35 has a positive refractive power, its object side 35 a is convex, its image side 35 b is convex, and both the object side 35 a and the image side 35 b are aspherical. The material of the fifth lens 35 is plastic.

The filter element 36 is disposed between the fifth lens 35 and the imaging surface 38 to filter out light in a specific wavelength range, such as an infrared filter element. The two surfaces 36a, 36b of the filter element 36 are both flat and made of glass.

The protective glass 37 is disposed between the filter element 36 and the imaging surface 38 to protect the imaging surface 38 . The two surfaces 37a, 37b of the protective glass 37 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 the aspheric coefficient 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 8. 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 (14).

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 . 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 ±0.07mm. 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 5.0%. 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 ±0.05mm. 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. 4B is, from left to right, the astigmatism/field curvature diagram (Astigmatism/Field Curvature), distortion diagram (Distortion) and longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the fourth embodiment of the present invention.

As shown in FIG. 4A, the optical imaging lens group 40 of the fourth embodiment includes a first lens 41, a second lens 42, a diaphragm ST, a third lens 43, a fourth lens 44 and a fifth lens in sequence from the object side to the image side. Lens 45. The optical camera lens group 40 can further include a filter element 46 , a protective glass 47 and an imaging surface 48 . An image sensing element 400 can be further disposed on the imaging surface 48 to form an imaging device (not labeled otherwise).

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

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

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

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 is plastic.

The fifth lens 45 has a positive refractive power, its object side 45 a is convex, its image side 45 b is convex, and both the object side 45 a and the image side 45 b are aspherical. The material of the fifth lens 45 is plastic.

The filter element 46 is disposed between the fifth lens 45 and the imaging surface 48 to filter out light in a specific wavelength range, such as an infrared filter element. The two surfaces 46a, 46b of the filter element 46 are both flat and made of glass.

The protective glass 47 is disposed between the filter element 46 and the imaging surface 48 to protect the imaging surface 48 . The two surfaces 47a, 47b of the protective glass 47 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 (14).

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 . 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 ±0.07mm. 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 5.0%. 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 ±0.07mm; the variation of the aberration in the meridian direction is within the entire field of view Within ±0.10mm. 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, distortion and longitudinal spherical aberration diagrams (Longitudinal Spherical Aberration) of the fifth embodiment of the present invention.

As shown in Figure 5A, the optical imaging lens group 50 of the fifth embodiment includes a first lens 51, a second lens 52, a diaphragm ST, a third lens 53, a fourth lens 54 and a fifth lens in sequence from the object side to the image side. Lens 55. The optical camera lens group 50 can further include a filter element 56 , a protective glass 57 and an imaging surface 58 . An image sensing element 500 can be further disposed on the imaging surface 58 to form an imaging device (not labeled otherwise).

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

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

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

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 is plastic.

The fifth lens 55 has a positive refractive power, its object side 55 a is convex, its image side 55 b is convex, and both the object side 55 a and the image side 55 b are aspherical. The material of the fifth lens 55 is plastic.

The filter element 56 is disposed between the fifth lens 55 and the imaging surface 58 to filter out light in a specific wavelength range, such as an infrared filter element. The two surfaces 56a, 56b of the filter element 56 are both flat and made of glass.

The protective glass 57 is disposed between the filter element 56 and the imaging surface 58 to protect the imaging surface 58 . The two surfaces 57a, 57b of the protective glass 57 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 (14).

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 . It can be seen from the longitudinal spherical aberration diagram that the three kinds of off-axis rays with 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 ±0.06mm. 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 40 is less than 10.0%. From the astigmatism field curvature aberration diagram (wavelength 555nm), it can be seen that the aberration in the sagittal direction changes within ±0.07mm in the entire field of view Within; the variation of aberration in the meridional direction within the entire field of view is within ±0.07mm. 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. 6, the sixth embodiment of the present invention is an imaging device 1010, and this imaging device 1010 includes the optical imaging lens groups 10, 20, 30, 40, 50 of the aforementioned first to fifth embodiments, and an image sensor Elements 100, 200, 300, 400, 500; wherein, the image sensing elements 100, 200, 300, 400, 500 are arranged on the imaging planes 100, 200 of the optical imaging lens groups 17, 27, 37, 47, 57 , 300, 400, 500. The image sensing elements 100 , 200 , 300 , 400 , and 500 are, for example, Charge-Coupled Devices (CCD) or Complementary Metal Oxide Semiconductor (CMOS) image sensing elements.

Seventh embodiment

Referring to FIG. 6 , it shows a vehicle electronic device 1000 according to the seventh embodiment of the present invention. This vehicle electronic device 1000 includes an imaging device 1010 as in the sixth embodiment, wherein the vehicle electronic device 1000 is used to observe , monitor, sense and/or record conditions within the vehicle.

Although the present invention has been described using the preceding several examples, these examples are not intended to limit the scope of the present invention. For anyone skilled in the 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 disclosed embodiments of the present invention. Therefore, what needs to be understood here is that the present invention is defined by 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 within the scope of the patent.

10: Optical camera lens group

11: First lens

12: Second lens

13: Third lens

14: Fourth lens

15: fifth lens

15: Filter element

16: Protective glass

18: 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: The side of the fifth lens

15b: The image side of the fifth lens

16a, 16b: two surfaces of the filter element

17a, 17b: the second surface of the protective glass

100: Image sensing element

I: optical axis

ST: Aperture

Claims (16)

An optical imaging lens group, comprising in sequence from the object side to the image side: a first lens with negative refraction power and a concave image side; a second lens with positive refraction power and a concave object side; Three lenses, with positive refractive power, and its object side is convex; a fourth lens, with negative refractive power; and a fifth lens, with positive refractive power, and its image side is convex; wherein, the lens of the optical imaging lens group The total is five pieces; the distance from the third lens image side to the object side of the fourth lens along the optical axis is AT34, and the distance from the fourth lens image to the object side of the fifth lens along the optical axis is AT45. The focal length of the lens is f1, the focal length of the third lens is f3, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 2.00

AT34/AT45

29.00; and |(1/f1)+(1/f3)|*EFL

0.20. For example, the optical imaging lens group of claim 1, wherein the radius of curvature of the image side of the fourth lens is R8, and the radius of curvature of the object side of the fifth lens is R9, which satisfy the following relationship: |R8/ R9｜

1.5. An optical imaging lens group, comprising in sequence from the object side to the image side: a first lens with negative refraction power and a concave image side; a second lens with positive refraction power and a concave object side; Three lenses, with positive refractive power, and its image side is convex; a fourth lens, with negative refractive power; and a fifth lens, with positive refractive power, and its object side is convex; wherein, the lens of the optical imaging lens group The total number is five pieces; the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfy the following relationship: 0.20

R7/R8

3.00. For example, the optical imaging lens group of item 4 of the patent scope, wherein the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the total length of the optical imaging lens group is TTL, which satisfies the following relationship Formula: 0.10

AT23/TTL

0.30. Such as the optical imaging lens group of item 4 of the scope of the patent application, wherein the distance from the image side of the third lens to the object side of the fourth lens along the optical axis is AT34, and the image side of the fourth lens to the fifth lens along the optical axis The distance from the side of the object is AT45, and the thickness of the fourth lens along the optical axis is CT4, which satisfies the following relationship: 2.00

(AT34+AT45)/CT4

5.00. Such as the optical imaging lens group of item 1 or item 4 of the scope of the patent application, wherein the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the image side of the fourth lens is from the image side along the optical axis to The distance from the object side of the fifth lens is AT45, which satisfies the following relationship: 14.0

AT23/AT45

97.0. Such as the optical imaging lens group of item 1 or item 4 of the scope of patent application, wherein the distance from the image side of the second lens to the object side of the third lens along the optical axis is AT23, and the image side of the third lens along the optical axis to The distance from the object side of the fourth lens is AT34, and the distance from the image side of the fourth lens to the object side of the fifth lens along the optical axis is AT45, which satisfies the following relationship: 0.20

(AT34+AT45)/AT23

0.40. Such as the optical imaging lens group of item 1 or item 4 of the patent scope, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, the refractive index of the first lens is N1, and the third lens has a focal length of f3. The refractive index of the lens is N3, the dispersion coefficient of the first lens is V1, and the dispersion coefficient of the third lens is V3, which satisfy the following relationship: 3.00

｜(N1*V1/f1)+(N3*V3/f3)｜

6.50. Such as the optical imaging lens group of item 1 or item 4 of the patent scope, wherein the radius of curvature of the image side of the third lens is R6, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the first lens is The radius of curvature on the object side is R1, and the radius of curvature on the image side of the first lens is R2, satisfying at least one of the following relational expressions: |R6/R7|

20.0 and｜R1/R2｜

15.0. Such as the optical imaging lens group of item 1 or item 4 of the patent scope, wherein, the maximum image height of the optical imaging lens group is ImgH, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 0.90

ImgH/EFL

1.20. Such as the optical imaging lens group of item 1 or item 4 of the patent scope, wherein the radius of the first lens image side perpendicular to the optical axis is D2, and the curvature radius of the first lens image side is R2, which satisfies the following relationship Formula: 0.60

D2/R2

0.90. As for the optical imaging lens group of item 1 or item 4 of the scope of the patent application, wherein the object side of the first lens is convex at the paraxial position. Such as the optical imaging lens group of item 1 or item 4 of the patent scope, wherein, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, which satisfy the following relationship: 0 <R7*R8. As the optical imaging lens group of item 1 or item 4 of the scope of the patent application, wherein, the object side of the fourth lens is concave at the near axis. An imaging device includes the optical imaging lens group as claimed in item 1 or item 4 of the scope of the patent application, and an image sensing element, wherein the image sensing element is arranged on the imaging surface of the optical imaging lens group. An electronic device, which includes the imaging device described in claim 16 of the patent application.

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