TWI690743B - Optical imaging lens, imaging device and electronic device - Google Patents

Abstract

An optical imaging lens including, in order from an object side to an image side, a first lens having negative refractive power, a second lens having negative refractive power, a third lens having positive refractive power, an aperture stop, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power. The first lens includes an image-side surface being concave. The second lens includes an image-side surface being concave. The fourth lens includes an image-side surface being convex. The fifth lens includes an object-side surface being concave. The seventh lens includes an object-side surface being concave. The optical imaging lens includes a total of seven elements. When specific conditions are satisfied, it is favorable to provide a wide-angle imaging lens having a compact size and good imaging quality.

Description

Optical camera lens group, imaging device and electronic device

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

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

With the diversified development of consumer electronic products, such as smart phones, sports cameras, driving recorders, reversing camera devices, and home surveillance camera equipment, the design requirements of optical imaging lenses have also become more diverse. Taking a car photography device as an example, an optical imaging lens is generally required to have better environmental adaptability. For example, from a low-temperature cold zone to a high-temperature tropical zone, in accordance with temperature changes in different regions and seasons, it is necessary to maintain a stable imaging quality. In addition, due to the trend of lighter and thinner specifications of consumer electronic products, related components such as optical imaging lenses, etc., must be further miniaturized in size. However, reducing the size of the optical imaging lens is often difficult to take into account both the shooting angle and maintain good imaging quality.

In addition, the wide-angle camera lens group provided by the conventional technology is usually only suitable for shooting in the visible light environment, if the light is weak at night, or the environment using infrared light source It is difficult to obtain a clear imaging effect. With the increasing demand of today's consumers for taking photos or photography at night, such as the need for security surveillance photography at home or company, or the continuous use of camera lenses to record driving images at night while the vehicle is driving, this can only be done in the visible light band The optical lens used to shoot the image has gradually failed to meet the needs of consumers.

Therefore, how to provide an optical imaging lens that is miniaturized, resistant to environmental climate changes, and has a wide-angle imaging effect is the goal of continuous efforts by those in the technical field.

Therefore, in order to solve the above problem, the present invention provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens in order from the object side to the image side Lens and seventh lens. Among them, the first lens has negative refractive power and its image side is concave. The second lens has negative refractive power and its image side is concave. The third lens has positive refractive power and the fourth lens has positive refractive power. The image side is convex; the fifth lens has negative refractive power, the object side is concave, and the image side is convex, wherein the fourth lens and the fifth lens form a cemented lens; the sixth lens has positive refractive power; The seventh lens has negative refractive power and its object side is concave. The total number of lenses in the optical camera lens group is seven. The effective focal length of the optical imaging lens group is EFL, and the focal length of the third lens is f3, which satisfies the following relationship: 1.4<f3/EFL<4.7.

According to an embodiment of the present invention, the total thickness of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens on the optical axis is Σ CT, and the first The distance from the object side of one lens to the image side of the seventh lens on the optical axis is Dr1r13, which satisfies the following relationship: 0.4<Σ CT/Dr1r13<0.8.

According to an embodiment of the present invention, the combined focal length of the fourth lens and the fifth lens is f45, which satisfies the following relationship between the effective focal length EFL of the overall optical imaging lens group: 2.5<f45/EFL<19.

The invention further provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order from the object side to the image side. Among them, the first lens has negative refractive power and its image side is concave; the second lens has negative refractive power and its image side is concave; the third lens has positive refractive power; the fourth lens has positive refractive power, The image side is convex; the fifth lens has negative refractive power, and the object side is concave, wherein the fourth lens and fifth lens form a cemented lens; the sixth lens has positive refractive power; the seventh lens has negative power The bending force is concave on the side of the object. The total number of lenses in the optical camera lens group is seven. Among them, the total thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens on the optical axis is Σ CT, and the object side of the first lens to the seventh The distance of the image side of the lens on the optical axis is Dr1r13; the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 0.4<Σ CT /Dr1r13<0.8; and 2.5<f45/EFL<19.

According to an embodiment of the present invention, the dispersion coefficients of the fourth lens, fifth lens, sixth lens, and seventh lens are Vd4, Vd5, Vd6, and Vd7, respectively, which satisfy the following relationship: 20<Vd4-Vd5< 50; and 20<Vd6-Vd7<50.

According to an embodiment of the present invention, the focal length of the first lens is f1, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: -3.5<f1/EFL<-1.8.

According to an embodiment of the present invention, the focal length of the second lens is f2, and the focal length f3 of the third lens satisfies the following relationship: -1.8<f2/f3<-0.7.

According to an embodiment of the present invention, the distance from the aperture of the optical imaging lens group to the imaging surface on the optical axis is SL, and the distance from the object side of the first lens to the imaging surface of the optical imaging lens group on the optical axis is TTL, which satisfies the following relationship: 0.4<SL/TTL<0.65.

According to an embodiment of the present invention, the curvature radius of the fourth lens object side surface is R7, and the curvature radius of the image side surface is R8, which satisfies the following relationship: |R7/R8|>2.

According to an embodiment of the present invention, the curvature radius of the object side of the seventh lens is R12, and the curvature radius of the image side is R13, which satisfies the following relationship: |R13/R12|>1.

According to an embodiment of the present invention, the optical camera lens group is applied to visible light and near infrared imaging, and the effective focal length of the optical camera lens group at a visible light wavelength of 588 nm is EFL ₅₈₈ and the effective focal length at a near infrared wavelength of 940 nm For EFL ₉₄₀ , it meets the following conditions: 0.95<EFL ₉₄₀ /EFL ₅₈₈ <1.1.

According to an embodiment of the invention, both the object side and the image side of the third lens are convex.

According to an embodiment of the present invention, the distance from the object side of the first lens to the imaging surface of the optical imaging lens group on the optical axis is TTL, and the maximum image height of the optical imaging lens group is ImgH, which satisfies the following relationship: TTL /ImgH<9.

According to an embodiment of the present invention, the optical imaging lens group includes at least three lenses with a refractive index greater than 1.7.

According to an embodiment of the present invention, the distance from the image side of the first lens to the object side of the second lens on the optical axis is AT12, and the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship: 0.3< AT12/CT3<1.7.

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

The present invention further provides an electronic device including the aforementioned imaging device and a near-infrared emitting element, wherein the near-infrared emitting element is used to emit a near-infrared beam so that the electronic device can be in two wavelength ranges of visible light or near-infrared light Capture images.

In order to make the above features and advantages of the present invention more comprehensible, several embodiments are listed below and described in detail with reference to the drawings.

10, 20, 30, 40, 50, 60, 70, 80: optical camera lens group

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

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

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

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

15, 25, 35, 45, 55, 65, 75, 85: fifth lens

16, 26, 36, 46, 56, 66, 76, 86: sixth lens

17, 27, 37, 47, 57, 67, 77, 87: seventh lens

18, 28, 38, 48, 58, 68, 78, 88: filter element

19, 29, 39, 49, 59, 69, 79, 89: protective glass

10a, 20a, 30a, 40a, 50a, 60a, 70a, 80a: imaging surface

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

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

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

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

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

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

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

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

15a, 25a, 35a, 45a, 55a, 65a, 75a, 85a: the object side of the fifth lens

15b, 25b, 35b, 45b, 55b, 65b, 75b, 85b: the image side of the fifth lens

16a, 26a, 36a, 46a, 56a, 66a, 76a, 86a: object side of sixth lens

16b, 26b, 36b, 46b, 56b, 66b, 76b, 86b: the image side of the sixth lens

17a, 27a, 37a, 47a, 57a, 67a, 77a, 87a: the object side of the seventh lens

17b, 27b, 37b, 47b, 57b, 67b, 77b, 87b: the image side of the seventh lens

18a, 18b, 28a, 28b, 38a, 38b, 48a, 48b, 58a, 58b, 68a, 68b, 78a, 78b, 88a, 88b: the second surface of the filter element

19a, 19b, 29a, 29b, 39a, 39b, 49a, 49b, 59a, 59b, 69a, 69b, 79a, 79b, 89a, 89b: the second surface of the protective glass

100, 200, 300, 400, 500, 600, 700, 800: image sensing element

1000: electronic device

1010: Imaging device

1020: Near-infrared emitting element

I: optical axis

ST: Aperture

[FIG. 1A] is a schematic diagram of an optical imaging lens group according to a first embodiment of the present invention; [FIG. 1B] is a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distorted image in order from left to right. Difference diagram; [FIG. 2A] is a schematic diagram of an optical imaging lens group according to a second embodiment of the invention; [FIG. 2B] is a longitudinal spherical aberration diagram and an astigmatic field curvature aberration diagram of the second embodiment of the invention in order from left to right. And distortion aberration diagrams; [FIG. 3A] is a schematic diagram of an optical imaging lens group according to a third embodiment of the invention; [FIG. 3B] is a longitudinal spherical aberration diagram and astigmatism field curvature of the third embodiment of the invention in order from left to right Aberration diagrams and distortion aberration diagrams; [FIG. 4A] is a schematic diagram of an optical imaging lens group according to a fourth embodiment of the present invention; [FIG. 4B] is a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distorted image in order from left to right. Difference diagram; [FIG. 5A] is a schematic diagram of an optical imaging lens group according to a fifth embodiment of the present invention; [FIG. 5B] is a longitudinal spherical aberration diagram and an astigmatic field curvature aberration diagram of the fifth embodiment of the invention in order from left to right. And distortion aberration diagrams; [FIG. 6A] is a schematic diagram of an optical imaging lens group according to a sixth embodiment of the invention; [FIG. 6B] from left to right are longitudinal spherical aberration diagrams and astigmatism field curvatures of the sixth embodiment of the invention. Aberration diagrams and distortion aberration diagrams; [FIG. 7A] is a schematic diagram of an optical imaging lens group according to a seventh embodiment of the present invention; [FIG. 7B] is a longitudinal spherical aberration diagram of the seventh embodiment of the present invention in order from left to right. Astigmatism field aberration diagram and distortion aberration diagram; [FIG. 8A] is a schematic diagram of an optical imaging lens group according to an eighth embodiment of the invention; [FIG. 8B] is a longitudinal sphere in accordance with an eighth embodiment of the invention in order from left to right Aberration diagrams, astigmatic field aberration diagrams and distortion aberration diagrams; and [FIG. 9] are schematic diagrams of an electronic device according to a tenth embodiment of the invention.

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

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

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

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

The invention provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order from the object side to the image side. Among them, the first lens has negative refractive power and its image side is concave; the second lens has negative refractive power and its image side is concave; the third lens has positive refractive power; the fourth lens and the fifth lens constitute a positive refractive power The power of the cemented lens; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power, and its object side is concave. The number of lens groups of this optical camera lens group is seven.

The first lens has a negative refractive power, and the image side is designed as a concave surface, so when the first lens receives incident light at different angles, the light transmitted to the image side is not easy to penetrate the first lens due to the phenomenon of total reflection. Therefore, the incident light received on the object side can be transmitted toward the imaging side. In addition, the refraction of the first lens and the shape of the image side (light exit surface) can change the path of incident light and reduce the angle between the light and the optical axis; the second lens also has negative refractive power, The image side is also designed as a concave surface, so that the light can be further deflected toward the optical axis, which helps to reduce the imaging aberration and expand the angle of view of the optical imaging lens group.

The third lens has a positive refractive power and serves as an element for adjusting the optical path to converge the divergent light beam formed by the first lens and the second lens.

The fourth lens has a positive refractive power and its image side is convex, while the fifth lens has a negative refractive power and its object side is concave. The fourth lens is composed of a material with a high dispersion coefficient, The fifth lens is composed of a material with a low dispersion coefficient. The image side of the fourth lens and the object side of the fifth lens are cemented with each other to form a cemented lens to eliminate chromatic aberration of the optical imaging lens group.

The sixth lens has a positive refractive power, and the seventh lens has a negative refractive power, and the object side of the seventh lens is a concave surface, which is formed by the arrangement of the positive and negative refractive powers of the sixth lens and the seventh lens and the two lenses The air gap can correct the field curvature aberration and spherical aberration of the optical imaging lens group.

The focal length f3 of the third lens of the optical imaging lens group and the effective focal length EFL of the overall optical imaging lens group satisfy the following relationship: 1.4<f3/EFL<4.7 (1); by satisfying the condition of relationship (1) , It is conducive to reducing the volume of the optical camera lens group, while maintaining good optical performance. If f3/EFL is lower than the lower limit of relation (1), the refractive power of the third lens is too large, making the distance between the third lens and the imaging surface too short, it is difficult to arrange the lens group behind the third lens; if f3 /EFL is higher than the upper limit of relation (1), the focal length of the third lens is too long, and it is difficult to balance the negative refractive power of the first lens and the second lens.

The total thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens on the optical axis of the optical imaging lens group is Σ CT, and the first lens object The distance between the side and the seventh lens image side on the optical axis is Dr1r13, and the two meet the following conditions: 0.4<Σ CT/Dr1r13<0.8 (2); by satisfying the condition of relation (2), available To adjust the total thickness of the first lens to the seventh lens on the optical axis and the distance from the object side of the first lens to the image side of the seventh lens on the optical axis, an appropriate ratio is maintained between the two.

The combined focal length of the fourth lens and the fifth lens of the optical imaging lens group is f45, and the overall effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2.5<f45/EFL<19 (3); Satisfies the condition of relation (3), so that the cemented lens composed of the fourth lens and the fifth lens can have an appropriate positive refractive power, and can cooperate with a third lens that also has a positive refractive power to adjust the traveling direction of light to make the optical imaging The back focal length (Back Focal Length) of the lens group is not too short, which can reduce the incident angle of light on the imaging surface.

The fourth lens, the fifth lens, the sixth lens, and the seventh lens of the optical imaging lens group have dispersion coefficients of Vd4, Vd5, Vd6, and Vd7, respectively, which satisfy the following relationship: 20<Vd4-Vd5<50 (4 ); and 20<Vd6-Vd7<50 (5); By satisfying the conditions of relational expressions (4) and (5), the chromatic aberration of the optical imaging lens group can be effectively corrected so that the optical imaging lens group is in visible light In the near-infrared wavelength range, good imaging quality can be obtained.

The focal length of the first lens of the optical imaging lens group is f1, and the overall effective focal length EFL of the optical imaging lens group satisfies the following relationship: -3.5<f1/EFL<-1.8 (6); by satisfying the relationship The condition of formula (6) is beneficial to make the first lens have an appropriate negative refractive power and improve the angle of view of the optical imaging lens group.

The focal length of the second lens of the optical imaging lens group is f2, and the focal length f3 of the third lens satisfies the following relationship: -1.8<f2/f3<-0.7 (7); By satisfying the condition of relation (7), it is beneficial to balance the refractive power of the second lens and the third lens, so that the combined focal length of the second lens and the third lens is Positive value.

The distance from the aperture of the optical camera lens group to the imaging surface on the optical axis is SL, and the distance from the side surface of the first lens object to the imaging surface on the optical axis is TTL, which satisfies the following relationship: 0.4<SL/TTL< 0.65 (8); by satisfying the condition of relation (8), controlling the ratio of the distance between the aperture to the imaging surface and the distance TTL of the first lens object side to the imaging surface is conducive to reducing the total length of the optical imaging lens group.

The fourth lens of the optical imaging lens group has an object side curvature radius of R7 and an image side curvature radius of R8, which satisfies the following relationship: |R7/R8|>2 (9); by satisfying the relationship (9) Conditions, can make the bonding surface of the fourth lens and the fifth lens have a curved surface, which is helpful to eliminate chromatic aberration; in addition, the radius of curvature of the object side of the fourth lens can also be controlled not to be too small, to avoid causing the fourth The refractive power of the lens is too large, and it is difficult to balance the refractive power and spacing between the lens groups.

The curvature radius of the seventh lens object side surface of the optical imaging lens group is R12, and the curvature radius of the seventh lens image side surface is R13, which satisfies the following relationship: |R13/R12|>1 (10); by satisfying the relationship The condition of equation (10) can help reduce the field curvature aberration.

The effective focal length of the optical camera lens group at visible light wavelength 588nm is EFL ₅₈₈ , and the effective focal length at near infrared wavelength 940nm is EFL ₉₄₀ , which satisfies the following relationship: 0.95<EFL ₉₄₀ /EFL ₅₈₈ <1.1(11); By satisfying the condition of relation (11), the optical imaging lens group can have a good imaging effect under both visible light sources and near-infrared light sources.

The optical imaging lens group further satisfies the following condition: both the object side and the image side of the third lens are convex.

The maximum image height of the optical imaging lens group on the imaging surface is ImgH, and the effective focal length of the optical imaging lens group satisfies the following relationship: TTL/ImgH<9 (11); by satisfying the relationship (11 ) Condition, is conducive to reducing the total length of the optical imaging lens group.

The optical imaging lens group includes at least three lenses with higher refractive index, which is beneficial to reduce the imaging aberration of the optical imaging lens group. Among them, the refractive index of at least three lenses is greater than 1.7.

The distance between the image side of the first lens and the object side of the second lens on the optical axis of the optical imaging lens group is AT12, and the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship: 0.3<AT12/CT3 <1.7 (12); by satisfying the condition of relation (12), it can be used to adjust the thickness of the third lens on the optical axis and control the distance between the first lens and the second lens on the optical axis, which helps to form a wide range Angle of view lens structure to expand the angle of view.

First embodiment

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

As shown in FIG. 1A, the optical imaging lens group 10 of the first embodiment includes, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, an aperture ST, a fourth lens 14, a fifth The lens 15, the sixth lens 16, and the seventh lens 17. The optical imaging lens group 10 may further include a filter element 18, a protective glass 19, and an imaging surface 10a. An image sensing element 100 may be further disposed on the imaging surface 10a to constitute an imaging device (not otherwise labeled).

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

The second lens 12 has a negative refractive power, its object side surface 12a is a concave surface, the image side surface 12b is a concave surface, and its object side surface 12a and image side surface 12b are both spherical surfaces. The material of the second lens 12 is glass.

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

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

The fifth lens 15 has a negative refractive power, the object side surface 15a is a concave surface, the image side surface 15b is a convex surface, and the object side surface 15a and the image side surface 15b are both spherical surfaces. The material of the fifth lens 15 is glass. Among them, the image side 14b of the fourth lens 14 and the object side 15a of the fifth lens 15 have the same radius of curvature, and the fourth lens 14 and the fifth lens 15 are bonded to each other through the two surfaces (14b, 15a) to form a Glue lens.

The sixth lens 16 has a positive refractive power, its object side 16a is convex, its image side 16b is convex, and both its object side 16a and image side 16b are spherical. The material of the sixth lens 16 is glass.

The seventh lens 17 has a negative refractive power, the object side surface 17a is a concave surface, the image side surface 17b is a convex surface, and both the object side surface 17a and the image side surface 17b are spherical surfaces. The material of the seventh lens 17 is glass.

The filter element 18 is disposed between the seventh lens 17 and the imaging surface 10a, and is used to filter light in a specific wavelength range. The two surfaces 18a and 18b of the filter element 18 are both flat, and the material is glass.

The protective glass 19 is disposed on the image sensing element 100, the two surfaces 19a and 19b are both flat, and the material is glass.

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

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens group 10 of the first embodiment of the present invention. Among them, the object side surface 11a of the first lens 11 is marked as the surface 11a, the image side surface 11b is marked as the surface 11b, and the other lens surfaces are deduced by analogy. The value in the distance field in the table represents the distance from the surface to the next surface on the optical axis I. For example, the distance between the object side 11a and the image side 11b of the first lens 11 is 0.7 mm, which means that the first lens 11 is on the optical axis The thickness is 0.7mm. The distance from the image side surface 11b of the first lens 11 to the object side surface 12a of the second lens 12 is 2.4 mm. Others can be deduced by analogy.

In the first embodiment, the effective focal length of the optical imaging lens group 10 is EFL, the aperture value (F-number) is Fno, the half of the maximum angle of view of the overall optical imaging lens group 10 is HFOV (Half Field of View), and the first lens 11 The distance between the object side surface 11a and the imaging surface 18 on the optical axis I is the total length TTL, One half of the diagonal of the effective sensing area of the image sensing element 100 on the imaging surface 18 is the maximum image height ImgH, and the values are as follows: EFL=1.83mm, Fno=2.08, TTL=16.21mm, HFOV=64 degrees, ImgH= 1.98mm. The tables in the following embodiments correspond to the optical imaging lens groups in the embodiments, and the definitions of the tables are the same as in this embodiment, so they are not described in detail in the following embodiments.

In the first embodiment, the relationship between the focal length f3 of the third lens 13 and the effective focal length EFL of the optical imaging lens group 10 is f3/EFL=2.46.

In the first embodiment, the sum of the thickness of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 on the optical axis, Σ CT and The distance Dr1r13 from the object side surface 11a of the first lens 11 to the image side surface 17b of the seventh lens 17 on the optical axis, the relationship between the two is ΣCT/Dr1r13=0.64.

In the first embodiment, the relationship between the combined focal length f45 of the fourth lens 14 and the fifth lens 15 and the effective focal length of the optical imaging lens group 10 is f45/EFL=3.1.

In the first embodiment, the relationship between the dispersion coefficient Vd4 of the fourth lens 14 and the dispersion coefficient Vd5 of the fifth lens 15 is Vd4-Vd5=36.9, and the dispersion coefficient Vd6 of the sixth lens 16 and the dispersion coefficient of the seventh lens 17 The relationship of Vd7 is Vd6-Vd7=36.9.

In the first embodiment, the relationship between the focal length f1 of the first lens 11 and the effective focal length EFL of the optical imaging lens group 10 is f1/EFL=-3.13.

In the first embodiment, the relationship between the focal length f2 of the second lens 12 and the focal length f3 of the third lens 13 is f2/f3=-1.06.

In the first embodiment, the distance SL between the aperture ST and the imaging surface 10a on the optical axis and the distance TTL between the object side surface 11a of the first lens 11 and the imaging surface 10a on the optical axis, the relationship between the two is SL/TTL= 0.53.

In the first embodiment, the relationship between the curvature radius R7 of the object side surface 14a of the fourth lens 14 and the curvature radius R8 of the image side surface 14b is |R7/R8|=4.64.

In the first embodiment, the relationship between the curvature radius R12 of the object side surface 17a of the seventh lens 17 and the curvature radius R13 of the image side surface 17b is |R13/R12|=6.04.

In the first embodiment, the effective focal length EFL _{588 of the} optical imaging lens group 10 at the visible light wavelength 588 nm and the effective focal length EFL ₉₄₀ at the near infrared wavelength 940 nm, the relationship between the two is EFL ₉₄₀ /EFL ₅₈₈ =1.01.

In the first embodiment, the relationship between the distance TTL from the object side surface 11a of the first lens 11 of the optical imaging lens group 10 to the imaging surface 10a on the optical axis and the maximum image height ImgH of the optical imaging lens group 10 is TTL/ImgH =8.19.

In the first embodiment, the relationship between the distance between the image side 11b of the first lens 11 and the object side 12a of the second lens 12 on the optical axis is AT12, and the thickness CT3 of the third lens 13 on the optical axis is AT12/CT3=0.84 .

As can be seen from the numerical values of the above relationship, the optical imaging lens group 10 of the first embodiment satisfies the requirements of relationship (1) to (12).

Referring to FIG. 1B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 10, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the variation of the focal length in the sagittal direction astigmatism in the entire field of view is within ±0.06mm; the meridional astigmatism in the entire field of view The focal length variation within the range is within ±0.04mm; and the distortion aberration can be controlled within ±4%. As shown in FIG. 1B, the optical imaging lens group 10 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Second embodiment

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

As shown in FIG. 2A, the optical imaging lens group 20 of the second embodiment includes, in order from the object side to the image side, a first lens 21, a second lens 22, a third lens 23, an aperture ST, a fourth lens 24, and a fifth The lens 25, the sixth lens 26, and the seventh lens 27. The optical imaging lens group 20 may further include a filter element 28, a protective glass 29, and an imaging surface 20a. An image sensing element 200 can be further disposed on the imaging surface 20a to form an imaging device (not otherwise labeled).

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

The second lens 22 has a negative refractive power, its object side 22a is flat, the image side 22b is concave, and its image side 22b is spherical. The material of the second lens 22 is glass.

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

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

The fifth lens 25 has a negative refractive power, the object side surface 25a is a concave surface, the image side surface 25b is a convex surface, and the object side surface 25a and the image side surface 25b are both spherical surfaces. The material of the fifth lens 25 is glass. Among them, the image side 24b of the fourth lens 24 and the object side 25a of the fifth lens 25 have the same curvature And the fourth lens 24 and the fifth lens 25 are bonded to each other through the two surfaces (24b, 25a) to form a cemented lens.

The sixth lens 26 has a positive refractive power, its object side 26a is convex, its image side 26b is convex, and both its object side 26a and image side 26b are spherical. The material of the sixth lens 26 is glass.

The seventh lens 27 has a negative refractive power, the object side surface 27a is concave, the image side surface 27b is convex, and both the object side surface 27a and the image side surface 27b are aspherical. The seventh lens 27 is made of glass.

The filter element 28 is disposed between the seventh lens 27 and the imaging surface 20a, and is used to filter light in a specific wavelength range. The two surfaces 28a and 28b of the filter element 28 are flat surfaces, and the material is glass.

The protective glass 29 is disposed on the image sensing element 200. Both surfaces 29a and 29b are flat surfaces, and the material is glass.

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

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

Among them, X: the distance between the point on the aspheric surface from the optical axis Y and the tangent of the aspheric surface on the optical axis; Y: the vertical distance between the point on the aspheric surface and the optical axis; R: the lens at the near optical axis Radius of curvature; K: cone coefficient; and Ai: i-th aspheric coefficient.

The detailed optical data of the optical imaging lens group 20 of the second embodiment is listed in Table 2.

Please refer to Table 3 below, which is the aspherical coefficient of each surface of the seventh lens 27 in the second embodiment of the present invention. Among them, K is the cone coefficient in the aspheric curve equation, and A ₄ to A ₁₀ represent the 4th to 10th aspheric coefficients of each surface. For example, the taper coefficient K of the object side surface 27a of the seventh lens 27 is -0.204.

In the second embodiment, the numerical values of the relational expressions of the optical imaging lens group 20 are listed in Table 4. It can be seen from Table 4 that the optical imaging lens group 20 of the second embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 2B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field curvature aberration diagram, and a distortion aberration diagram of the optical imaging lens group 20, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the sagittal aberration aberration varies within ±0.04mm in the entire field of view; the meridional astigmatism in the entire field of view The amount of focal length change within the range Within ±0.05mm; distortion aberration can be controlled within ±6%. As shown in FIG. 2B, the optical imaging lens group 20 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Third embodiment

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

As shown in FIG. 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 order from the object side to the image side The lens 35, the sixth lens 36, and the seventh lens 37. The optical imaging lens group 30 may further include a filter element 38, a protective glass 39, and an imaging surface 30a. An image sensing element 300 may be further disposed on the imaging surface 30a to form an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 35 has a negative refractive power, the object side surface 35a is a concave surface, the image side surface 35b is a convex surface, and both the object side surface 35a and the image side surface 35b are spherical surfaces. The material of the fifth lens 35 is glass. Among them, the image side 34b of the fourth lens 34 and the object side 35a of the fifth lens 35 have the same radius of curvature, and the fourth lens 34 and the fifth lens 35 are bonded to each other through the two surfaces (34b, 35a) to form a Glue lens.

The sixth lens 36 has a positive refractive power, its object side 36a is convex, its image side 36b is convex, and both its object side 36a and image side 36b are spherical. The sixth lens 36 is made of glass.

The seventh lens 37 has a negative refractive power, the object side surface 37a is a concave surface, the image side surface 37b is a convex surface, and both the object side surface 37a and the image side surface 37b are spherical surfaces. The seventh lens 37 is made of glass.

The filter element 38 is disposed between the seventh lens 37 and the imaging surface 30a, and is used to filter light in a specific wavelength range. The two surfaces 38a and 38b of the filter element 38 are flat surfaces, and the material is glass.

The protective glass 39 is disposed on the image sensing element 300, the two surfaces 39a and 39b are both flat, and the material is glass.

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

The detailed optical data of the optical imaging lens group 30 of the third embodiment is listed in Table 5.

In the third embodiment, the numerical values of the relational expressions of the optical imaging lens group 30 are listed in Table 6. It can be seen from Table 6 that the optical imaging lens group 30 of the third embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 3B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram and the distortion aberration diagram of the optical imaging lens group 30, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the change in focal length of the sagittal astigmatic aberration in the entire field of view is within ±0.05mm; the meridional astigmatic aberration in the entire field of view The focal length variation within the range is within ±0.05mm; and the distortion aberration can be controlled within ±4%. As shown in FIG. 3B, the optical imaging lens group 30 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Fourth embodiment

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

As shown in FIG. 4A, the optical imaging lens group 40 of the fourth embodiment includes, in order from the object side to the image side, a first lens 41, a second lens 42, a third lens 43, an aperture ST, a fourth lens 44, a fifth The lens 45, the sixth lens 46, and the seventh lens 47. The optical imaging lens group 40 may further include a filter element 48, a protective glass 49, and an imaging surface 40a. An image sensing element 400 may be further disposed on the imaging surface 40a to constitute an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 45 has a negative refractive power, the object side surface 45a is a concave surface, the image side surface 45b is a convex surface, and the object side surface 45a and the image side surface 45b are both spherical surfaces. The material of the fifth lens 45 is glass. Among them, the image side 44b of the fourth lens 44 and the object side 45a of the fifth lens 45 have the same radius of curvature, and the fourth lens 44 and the fifth lens 45 are bonded to each other through the two surfaces (44b, 45a) to form a Glue lens.

The sixth lens 46 has a positive refractive power, its object side 46a is convex, its image side 46b is convex, and its object side 46a and image side 46b are both spherical. The material of the sixth lens 46 is glass.

The seventh lens 47 has a negative refractive power, its object side 47a is concave, the image side 47b is convex, and both its object side 47a and image side 47b are spherical. The seventh lens 47 is made of glass.

The filter element 48 is disposed between the seventh lens 47 and the imaging surface 40a, and is used to filter light in a specific wavelength range. The two surfaces 48a and 48b of the filter element 48 are flat surfaces, and the material is glass.

The protective glass 49 is disposed on the image sensing element 400. Both surfaces 49a and 49b are flat surfaces, and the material is glass.

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

Detailed optical data of the optical imaging lens group 40 of the fourth embodiment is listed in Table 7.

In the fourth embodiment, the numerical values of the relational expressions of the optical imaging lens group 40 are listed in Table 8. It can be seen from Table 8 that the optical imaging lens group 40 of the fourth embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 4B, from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field aberration diagram and the distortion aberration diagram of the optical imaging lens group 40, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the sagittal aberration aberration varies within ±0.04mm in the entire field of view; the meridional astigmatism in the entire field of view The focal length variation within the range is within ±0.04mm; and the distortion aberration can be controlled within ±3%. As shown in FIG. 4B, the optical imaging lens group 40 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Fifth embodiment

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

As shown in FIG. 5A, the optical imaging lens group 50 of the fifth embodiment includes, in order from the object side to the image side, a first lens 51, a second lens 52, a third lens 53, an aperture ST, a fourth lens 54, a fifth The lens 55, the sixth lens 56, and the seventh lens 57. The optical imaging lens group 50 may further include a filter element 58, a protective glass 59, and an imaging surface 50a. An image sensing element 500 can be further disposed on the imaging surface 50a to form an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 55 has a negative refractive power, the object side surface 55a is a concave surface, the image side surface 55b is a convex surface, and the object side surface 55a and the image side surface 55b are both spherical surfaces. The material of the fifth lens 55 is glass. Among them, the image side 54b of the fourth lens 54 and the object side 55a of the fifth lens 55 have the same radius of curvature, and the fourth lens 54 and the fifth lens 55 are bonded to each other through the two surfaces (54b, 55a) to form a Glue lens.

The sixth lens 56 has a positive refractive power, its object side 56a is convex, its image side 56b is convex, and its object side 56a and image side 56b are both spherical. The sixth lens 56 is made of glass.

The seventh lens 57 has a negative refractive power, the object side surface 57a is a concave surface, the image side surface 57b is a convex surface, and both the object side surface 57a and the image side surface 57b are spherical surfaces. The material of the seventh lens 57 is glass.

The filter element 58 is disposed between the seventh lens 57 and the imaging surface 50a, and is used to filter light of a specific wavelength range. The two surfaces 58a and 58b of the filter element 58 are flat surfaces, and the material is glass.

The protective glass 59 is disposed on the image sensing element 500, the two surfaces 59a and 59b are both flat, and the material is glass.

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

Detailed optical data of the optical imaging lens group 50 of the fifth embodiment is listed in Table 9.

In the fifth embodiment, the numerical values of each relational expression of the optical imaging lens group 50 are listed in Table 10. It can be seen from Table 10 that the optical imaging lens group 50 of the fifth embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 5B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 50, respectively. From the longitudinal spherical aberration diagram, it can be seen that the off-axis rays of the three visible wavelengths of 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.06mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the sagittal aberration aberration varies within ±0.04mm in the entire field of view; the meridional astigmatism in the entire field of view The amount of focal length change within the range Within ±0.04mm; and distortion aberration can be controlled within ±3%. As shown in FIG. 5B, the optical imaging lens group 50 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Sixth embodiment

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

As shown in FIG. 6A, the optical imaging lens group 60 of the sixth embodiment includes, in order from the object side to the image side, a first lens 61, a second lens 62, a third lens 63, an aperture ST, a fourth lens 64, and a fifth The lens 65, the sixth lens 66, and the seventh lens 67. The optical imaging lens group 60 may further include a filter element 68, a protective glass 69, and an imaging surface 60a. An image sensing element 600 may be further provided on the imaging surface 60a to form an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 65 has a negative refractive power, the object side surface 65a is a concave surface, the image side surface 65b is a convex surface, and the object side surface 65a and the image side surface 65b are both spherical surfaces. The material of the fifth lens 65 is glass. Among them, the image side 64b of the fourth lens 64 and the object side 65a of the fifth lens 65 have the same radius of curvature, and the fourth lens 64 and the fifth lens 65 are bonded to each other through the two surfaces (64b, 65a) to form a Glue lens.

The sixth lens 66 has a positive refractive power, its object side 66a is convex, its image side 66b is convex, and both its object side 66a and image side 66b are spherical. The sixth lens 66 is made of glass.

The seventh lens 67 has a negative refractive power, the object side surface 67a is a concave surface, the image side surface 67b is a convex surface, and both the object side surface 67a and the image side surface 67b are spherical surfaces. The material of the seventh lens 67 is glass.

The filter element 68 is disposed between the seventh lens 67 and the imaging surface 60a, and is used to filter light in a specific wavelength range. The two surfaces 68a and 68b of the filter element 68 are flat surfaces, and the material is glass.

The protective glass 69 is disposed on the image sensing element 600. Both surfaces 69a and 69b are flat surfaces, and the material is glass.

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

The detailed optical data of the optical imaging lens group 60 of the sixth embodiment is listed in Table 11.

In the sixth embodiment, the numerical values of the relational expressions of the optical imaging lens group 60 are listed in Table 12. It can be seen from Table 12 that the optical imaging lens group 60 of the sixth embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 6B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 60, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the change in focal length of the sagittal astigmatic aberration in the entire field of view is within ±0.05mm; the meridional astigmatic aberration in the entire field of view The focal length variation within the range is within ±0.06mm; and the distortion aberration can be controlled within ±4%. As shown in FIG. 6B, the optical imaging lens group 60 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Seventh embodiment

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

As shown in FIG. 7A, the optical imaging lens group 70 of the seventh embodiment includes, in order from the object side to the image side, a first lens 71, a second lens 72, a third lens 73, an aperture ST, a fourth lens 74, a fifth The lens 75, the sixth lens 76, and the seventh lens 77. The optical imaging lens group 70 may further include a filter element 78, a protective glass 79, and an imaging surface 70a. An image sensing element 700 may be further disposed on the imaging surface 70a to form an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 75 has a negative refractive power, the object side surface 75a is a concave surface, the image side surface 75b is a convex surface, and the object side surface 75a and the image side surface 75b are both spherical surfaces. The material of the fifth lens 75 is glass. Among them, the image side 74b of the fourth lens 74 and the object side 75a of the fifth lens 75 have the same radius of curvature, and the fourth lens 74 and the fifth lens 75 are bonded to each other through the two surfaces (74b, 75a) to form a Glue lens.

The sixth lens 76 has a positive refractive power, its object side 76a is convex, its image side 76b is convex, and both its object side 76a and image side 76b are spherical. The material of the sixth lens 76 is glass.

The seventh lens 77 has negative refractive power, its object side 77a is concave, and its image side 77b is convex, and its object side 77a and image side 77b are both spherical. The material of the seventh lens 77 is glass.

The filter element 78 is disposed between the seventh lens 77 and the imaging surface 70a, and is used to filter light of a specific wavelength range. The two surfaces 78a and 78b of the filter element 78 are flat surfaces, and the material is glass.

The protective glass 79 is disposed on the image sensing element 700. Both surfaces 79a and 79b are flat, and the material is glass.

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

The detailed optical data of the optical imaging lens group 70 of the seventh embodiment is listed in Table 13.

In the seventh embodiment, the numerical values of the relational expressions of the optical imaging lens group 70 are listed in Table 14. 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 (12).

Referring to FIG. 7B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field aberration diagram, and a distortion aberration diagram of the optical imaging lens group 70, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the sagittal aberration aberration varies within ±0.04mm in the entire field of view; the meridional astigmatism in the entire field of view The focal length variation within the range is within ±0.07mm; and the distortion aberration can be controlled within ±10%. As shown in FIG. 7B, the optical imaging lens group 70 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Eighth embodiment

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

As shown in FIG. 8A, the optical imaging lens group 80 of the eighth embodiment includes, in order from the object side to the image side, a first lens 81, a second lens 82, a third lens 83, an aperture ST, a fourth lens 84, and a fifth The lens 85, the sixth lens 86, and the seventh lens 87. The optical imaging lens group 80 may further include a filter element 88, a protective glass 89, and an imaging surface 80a. An image sensing element 800 may be further disposed on the imaging surface 80a to constitute an imaging device (not otherwise labeled).

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

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

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

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

The fifth lens 85 has a negative refractive power, the object side surface 85a is a concave surface, the image side surface 85b is a convex surface, and the object side surface 85a and the image side surface 85b are both spherical surfaces. The material of the fifth lens 85 is glass. Among them, the image side 84b of the fourth lens 84 and the object side 85a of the fifth lens 85 have the same radius of curvature, and the fourth lens 84 and the fifth lens 85 are bonded to each other through the two surfaces (84b, 85a) to form a Glue lens.

The sixth lens 86 has a positive refractive power, its object side 86a is convex, its image side 86b is convex, and its object side 86a and image side 86b are both spherical. The material of the sixth lens 86 is glass.

The seventh lens 87 has a negative refractive power, its object side 87a is concave, the image side 87b is concave, and both its object side 87a and image side 87b are spherical. The seventh lens 87 is made of glass.

The filter element 88 is disposed between the seventh lens 87 and the imaging surface 80a, and is used to filter light in a specific wavelength range. The two surfaces 88a and 88b of the filter element 88 are flat surfaces, and the material is glass.

The protective glass 89 is disposed on the image sensing element 800, the two surfaces 89a and 89b are both flat, and the material is glass.

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

The detailed optical data of the optical imaging lens group 80 of the eighth embodiment is listed in Table 15.

In the eighth embodiment, the numerical values of the relational expressions of the optical imaging lens group 80 are listed in Table 16. It can be seen from Table 16 that the optical imaging lens group 80 of the eighth embodiment satisfies the requirements of relational expressions (1) to (12).

Referring to FIG. 8B, from left to right in the figure are a longitudinal spherical aberration diagram, an astigmatic field curvature aberration diagram, and a distortion aberration diagram of the optical imaging lens group 80, respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible wavelengths 435nm, 588nm, 650nm and near infrared 940nm at different heights can be concentrated near the imaging point, and the imaging point deviation can be controlled within ±0.04mm. It can be seen from the curvature aberration diagram of the astigmatism field (wavelength 588nm) that the variation of the focal length of the sagittal astigmatism in the entire field of view is within ±0.03mm; the meridional astigmatism in the entire field of view The amount of focal length change within the range Within ±0.03mm; and distortion aberration can be controlled within ±7%. As shown in FIG. 8B, the optical imaging lens group 80 of this embodiment has corrected various aberrations well, which meets the imaging quality requirements of the optical system.

Ninth embodiment

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

Tenth embodiment

Please refer to FIG. 9, which is a schematic diagram of an electronic device 1000 according to a tenth embodiment of the present invention. As shown, the electronic device 1000 includes an imaging device 1010 and a near-infrared emitting element 1020. The imaging device 1010 is, for example, the imaging device of the foregoing ninth embodiment, and may be composed of the optical imaging lens group and an image sensing element of the present invention. The near-infrared emitting element 1020 is, for example, a near-infrared lamp for emitting a near-infrared beam with a wavelength of 940 nm. In this way, the user can use the electronic device 1000 to perform image capturing in the visible or near-infrared wavelength range according to environmental requirements. The electronic device 1000 is, for example, a driving monitoring device or a surveillance camera.

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

10: Optical camera lens group

11: First lens

12: Second lens

13: Third lens

14: fourth lens

15: Fifth lens

16: sixth lens

17: seventh lens

18: filter element

19: Protective glass

10a: imaging surface

11a: Object side of the first lens

11b: Image side of the first lens

12a: Object side of the second lens

12b: Image side of the second lens

13a: Object side of the third lens

13b: Image side of the third lens

14a: Object side of fourth lens

14b: Image side of fourth lens

15a: Object side of fifth lens

15b: Image side of fifth lens

16a: Object side of sixth lens

16b: Image side of sixth lens

17a: Object side of seventh lens

17b: Image side of seventh lens

18a, 18b: the second surface of the filter element

19a, 19b: the second surface of the protective glass

100: image sensor

I: optical axis

ST: Aperture

Claims (18)

An optical camera lens group includes, in order from the object side to the image side, a first lens with negative refractive power and an concave image side; a second lens with negative refractive power and an concave image side; a first lens Three lenses with positive refractive power; an aperture; a fourth lens with positive refractive power, the image side is convex; a fifth lens with negative refractive power, the object side is concave, and the image side is convex, where, The fourth lens and the fifth lens form a cemented lens; a sixth lens has a positive refractive power; and a seventh lens has a negative refractive power, and its object side is concave; wherein, the lens of the optical imaging lens group The total number is seven; 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: 1.4<f3/EFL<4.7. An optical imaging lens group as claimed in item 1 of the patent scope, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are The total thickness on the optical axis is Σ CT, and the distance between the object side of the first lens and the image side of the seventh lens on the optical axis is Dr1r13, which satisfies the following relationship: 0.4<Σ CT/Dr1r13<0.8. For example, the optical imaging lens group of claim 1 of the patent application, wherein the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2.5< f45/EFL<19. An optical camera lens group includes, in order from the object side to the image side, a first lens with negative refractive power and a concave image side; a second lens with negative refractive power and an concave image side; a first lens Three lenses with positive refractive power; an aperture; a fourth lens with positive refractive power, the image side is convex; a fifth lens with negative refractive power, the object side is concave, wherein the fourth lens and The fifth lens forms a cemented lens; a sixth lens has positive refractive power; and a seventh lens has negative refractive power, and its object side is concave; wherein, the total number of lenses of the optical camera lens group is seven; The total thickness of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens on the optical axis is Σ CT, and the first The distance from the object side of a lens to the image side of the seventh lens on the optical axis is Dr1r13, the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length of the optical imaging lens group is EFL, which satisfies The following relationship: 0.4<Σ CT/Dr1r13<0.8; and 2.5<f45/EFL<19. For example, in the optical imaging lens group of claim 4, the focal length of the third lens is f3, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 1.4<f3/EFL<4.7. For example, the optical imaging lens group of the first or fourth patent application, wherein the dispersion coefficients of the fourth lens, the fifth lens, the sixth lens, and the seventh lens are Vd4, Vd5, Vd6, and Vd7, respectively , Which satisfies the following relationship: 20<Vd4-Vd5<50; and 20<Vd6-Vd7<50. If the optical imaging lens group of the first or fourth patent application scope, wherein the focal length of the first lens is f1, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: -3.5<f1 /EFL<-1.8. For example, in the optical imaging lens group of claim 1 or claim 4, the focal length of the second lens is f2, and the focal length f3 of the third lens satisfies the following relationship: -1.8<f2/f3 <-0.7. For example, the optical imaging lens group according to item 1 or 4 of the patent application scope, wherein the optical imaging lens group satisfies the following relationship: 0.4<SL/TTL<0.65; wherein, SL is from the aperture to the optical imaging lens group The distance of the imaging plane on the optical axis, TTL is the distance from the object side of the first lens to the imaging plane of the optical imaging lens group on the optical axis. For example, in the optical imaging lens group of claim 1 or item 4, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side is R8, which satisfies the following relationship: |R7/R8| >2. For example, in the optical imaging lens group of claim 1 or claim 4, the radius of curvature of the object side of the seventh lens is R12, and the radius of curvature of the image side is R13, which satisfies the following relationship: |R13/R12| >1. An optical imaging lens group as claimed in item 1 or 4 of the patent scope, wherein the optical imaging lens group is applied to visible light and near infrared imaging, and the effective focal length of the optical imaging lens group at visible light wavelength 588 nm is EFL ₅₈₈ The effective focal length at near infrared wavelength 940nm is EFL ₉₄₀ , which satisfies the following conditions: 0.95<EFL ₉₄₀ /EFL ₅₈₈ <1.1. For example, in the optical imaging lens group of claim 1 or claim 4, the object side and the image side of the third lens are convex. For example, the optical imaging lens group according to item 1 or 4 of the patent application scope, wherein the distance from the object side of the first lens to the imaging surface of the optical imaging lens group on the optical axis is TTL, the maximum of the optical imaging lens group When the image height is ImgH, the system satisfies the following relationship: TTL/ImgH<9. For example, in the optical imaging lens group of claim 1 or 4, the refractive index of at least three lenses of the optical imaging lens group is greater than 1.7. For example, in the optical imaging lens group of claim 1 or claim 4, the distance between the image side of the first lens and the object side of the second lens on the optical axis is AT12, and the distance of the third lens on the optical axis The thickness is CT3, which satisfies the following relationship: 0.3<AT12/CT3<1.7. An imaging device includes an optical imaging lens group as claimed in item 1 or 4 of the patent application scope, and an image sensing element, wherein the image sensing element is disposed on the imaging surface of the optical imaging lens group. An electronic device including an imaging device as claimed in claim 17 and a near-infrared emitting element, wherein the near-infrared emitting element is used to emit a near-infrared beam so that the electronic device can operate at two wavelengths of visible light or near infrared Section capture images.

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