TWI751949B - Optical imaging lens, imaging device, and electronic device - Google Patents

Abstract

An optical imaging lens including, from an object side to an image side, a first lens having negative refractive power and including an object-side surface being convex and an image-side surface being concave, a second lens having negative refractive power and including an object-side surface being concave and an image-side surface being convex, a third lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, an aperture, a fourth lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, a fifth lens having negative refractive power and including an object-side surface being concave and a sixth lens having positive refractive power and including an object-side surface being convex. The optical imaging lens includes a total of six elements. When specific conditions are satisfied, the optical imaging lens could have a compact size, wide angle of view and good imaging qualities.

Description

Optical imaging lens set, imaging device and electronic device

The present invention relates to an optical imaging lens assembly and an imaging device, in particular to an optical imaging lens assembly, an imaging device and an electronic device suitable for a vehicle photographing electronic device or a monitoring photographing system.

With the advancement of semiconductor process technology, the pixels of the image sensor device can reach a smaller size, thereby improving the performance of the overall image sensor device. Therefore, the imaging quality of the optical imaging lens must also be continuously improved to meet the demands of the current consumer market.

In addition to the gradual development towards miniaturization, optical lens modules also require a wider photographic field of view and good imaging quality. However, increasing the imaging angle of view of the optical lens module often leads to an increase in the total length of the lens assembly (increased volume), or makes it difficult to correct aberrations. Taking US Patent No. 7,623,305 as an example, it includes a first lens group with negative refractive power, an aperture, and a second lens group with positive refractive power; the first lens group includes a first lens with negative refractive power and a positive refractive power. the second lens; the second lens group comprises a third lens with positive refractive power, a fourth lens with negative refractive power and a fifth lens with positive refractive power. Although the optical lens group structure disclosed in this patent can effectively reduce the distortion aberration of lens imaging, the shooting angle of view can only reach about 70 degrees, which cannot meet the needs of today's consumers.

Therefore, how to provide a small optical lens with a wide viewing angle and good imaging quality has become an urgent problem to be solved by those in the technical field.

Therefore, in order to solve the above problems, 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 and a sixth lens in sequence from the object side to the image side lens. Wherein, the first lens has negative refractive power, its object side is convex, and its image side is concave; the second lens has negative refractive power, its object side is concave, and its image side is convex; the third lens has positive refractive power, its The object side is convex and the image side is convex; the fourth lens has positive refractive power, the object side is convex, and the image side is convex; the fifth lens has negative refractive power, and its object side is concave, wherein the fourth lens and the first The five lenses form a cemented lens; and the sixth lens has positive refractive power, and its object side is convex; wherein, the total number of lenses in the optical imaging lens group is six; the composite focal length of the fourth lens and the fifth lens is f45, The curvature radius of the object side surface of the first lens is R1, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 4<f45/EFL<18; and 4<R1/EFL<8.

According to an embodiment of the present invention, the focal length of the third lens is f3, which satisfies the following relational formula: 2.5<f3/EFL<5.

According to an embodiment of the present invention, the radius of curvature of the image side surface of the second lens is R4, and the radius of curvature of the image side surface of the third lens is R6, which satisfy the following relationship: 1<R6/R4<17.

The present 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 and a sixth lens in sequence from the object side to the image side. Wherein, the first lens has negative refractive power, its object side is convex, and its image side is concave; the second lens has negative refractive power, its object side is concave, and its image side is convex; the third lens has positive refractive power, its The side of the object is convex, The image side is convex; the fourth lens has positive refractive power, the object side is convex, and the image side is convex; the fifth lens has negative refractive power, and its object side is concave, wherein the fourth lens and the fifth lens form a cemented lens; and the sixth lens has a positive refractive power, and its object side is convex; wherein, the total number of lenses in the optical imaging lens group is six; the radius of curvature of the image side of the second lens is R4, and the curvature of the image side of the third lens is R4 The radius is R6, the focal length of the third lens is f3, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 2.5<f3/EFL<5; and 1<R6/R4<17.

According to an embodiment of the present invention, the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following relationship: 3<f2/f1<25.

According to an embodiment of the present invention, the focal length of the fourth lens is f4, and the relationship between it and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 1.4<f4/EFL<2.3.

According to an embodiment of the present invention, the focal length of the sixth lens is f6, and the relationship between it and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2.8<f6/EFL<4.5.

According to an embodiment of the present invention, the combined focal length of the first lens, the second lens and the third lens is f123, and the relationship between it and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2.6< f123/EFL<7.3.

According to an embodiment of the present invention, the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging lens group is TTL, and the distance on the optical axis from the image side of the first lens to the object side of the second lens is AT12, the distance from the image side of the third lens to the fourth lens on the optical axis is AT34, which satisfies the following relationship: 2.7<TTL/(AT12+AT34)<4.4.

According to an embodiment of the present invention, 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 the following relationship: 3.2<R1/R2<6.8.

According to an embodiment of the present invention, the dispersion coefficient of the fourth lens is Vd4, and the dispersion coefficient of the fifth lens is Vd5, which satisfy the following relationship: 60<Vd4+Vd5<90; and Vd4>Vd5.

According to an embodiment of the present invention, the dispersion coefficient of the first lens is Vd1, the dispersion coefficient of the second lens is Vd2, and the dispersion coefficient of the third lens is Vd3, which satisfy the following relationship: (Vd1+Vd2+Vd3) <120.

According to an embodiment of the present invention, the focal length of the third lens is f3, the dispersion coefficient of the third lens is Vd3, and the dispersion coefficient of the fifth lens is Vd5, which are between the effective focal length EFL of the optical imaging lens group , which satisfies the following relation: 5<f3*Vd3/(Vd5*EFL)<8.5.

According to an embodiment of the present invention, the curvature radius of the image side surface of the fourth lens is R8, and the relationship between it and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: -1.4<R8/EFL<- 2.6.

According to an embodiment of the present invention, the distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens is AT12, and the thickness of the first lens on the optical axis is CT1, which satisfies the following relationship: 2< AT12/CT1<10.

According to an embodiment of the present invention, the distance from the image side of the sixth lens to the imaging plane of the optical imaging lens group on the optical axis is BFL, and the distance from the object side of the first lens to the imaging plane of the optical imaging lens group is on the optical axis The distance above is TTL, which satisfies the following relation: 0.09<BFL/TTL<0.18.

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

The present invention further provides an electronic device comprising the above-mentioned imaging device.

10, 20, 30, 40, 50, 60, 70, 80: Optical imaging 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: The 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: Filter elements

18, 28, 38, 48, 58, 68, 78, 88: Protective glass

19, 29, 39, 49, 59, 69, 79, 89: Imaging plane

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

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

17a, 17b, 27a, 27b, 37a, 37b, 47a, 47b, 57a, 57b, 67a, 67b, 77a, 77b, 87a, 87b: the second surface of the filter element

18a, 18b, 28a, 28b, 38a, 38b, 48a, 48b, 58a, 58b, 68a, 68b, 78a, 78b, 88a, 88b: The second surface of the protective glass

100, 200, 300, 400, 500, 600, 700, 800: Image sensing elements

1000: Electronics

1010: Imaging Devices

I: Optical axis

ST: Aperture

[FIG. 1A] is a schematic diagram of the optical imaging lens assembly according to the first embodiment of the present invention; [FIG. 1B] is the longitudinal spherical aberration diagram, astigmatic field curvature aberration diagram and distortion aberration diagram of the first embodiment of the present invention in order from left to right; [FIG. 2A] is the optical imaging lens of the second embodiment of the present invention A set of schematic diagrams; [FIG. 2B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the second embodiment of the present invention in order from left to right; [FIG. 3A] is the third embodiment of the present invention. Schematic diagram of the optical imaging lens group; [Fig. 3B] is the longitudinal spherical aberration diagram, astigmatic field curvature diagram and distortion aberration diagram of the third embodiment of the present invention in order from left to right; [Fig. 4A] is the fourth embodiment of the present invention. The schematic diagram of the optical imaging lens group of the embodiment; [FIG. 4B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the fourth embodiment of the present invention in order from left to right; [FIG. 5A] is this The schematic diagram of the optical imaging lens group according to the fifth embodiment of the present invention; [Fig. 5B] is the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the fifth embodiment of the present invention in order from left to right; [Fig. 6A] ] is a schematic diagram of the optical imaging lens group of the sixth embodiment of the present invention; [ FIG. 6B ] is the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the sixth embodiment of the present invention in order from left to right; [FIG. 7A] is a schematic diagram of the optical imaging lens group of the seventh embodiment of the present invention; [FIG. 7B] is the longitudinal spherical aberration diagram, astigmatic field curvature diagram and distortion image of the seventh embodiment of the present invention in order from left to right Aberration diagram; [FIG. 8A] is a schematic diagram of the optical imaging lens group of the eighth embodiment of the present invention; [FIG. 8B] is the longitudinal spherical aberration diagram and astigmatic field curvature diagram of the eighth embodiment of the present invention in order from left to right and distortion aberration diagram; and [ FIG. 9 ] is a schematic diagram of the electronic device according to the tenth 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, due to the temperature change resistance and high hardness of the glass material itself, the impact of environmental changes on the optical imaging lens group can be reduced, thereby prolonging the optical imaging. The service life of the lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical imaging lens group and reduce the production cost.

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

In embodiments of the present invention, the object side and the image side of each lens may be spherical or aspherical surfaces. The use of aspherical surfaces on the lens helps to correct imaging aberrations such as spherical aberrations in optical imaging lens groups, reducing the number of optical lens elements used. However, the use of aspherical lenses increases the cost of the overall optical imaging lens set. Although in the embodiments of the present invention, the surfaces of some optical lenses use spherical surfaces, they can still be designed as aspherical surfaces as required.

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

The invention provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side. Wherein, the first lens has negative refractive power, its object side is convex, and its image side is concave; the second lens has negative refractive power, its object side is concave, and its image side is convex; the third lens has positive refractive power, and its object The side is convex and the image side is convex; the fourth lens has positive refractive power, the object side is convex, and the image side is convex; the fifth lens has negative refractive power, and its object side is concave, wherein the fourth lens and the fifth lens are concave. The lens forms a cemented lens; the sixth lens has a positive refractive power, and its object side surface is a convex surface; wherein, the total number of lenses in the optical imaging lens group is six.

The first lens has a negative refractive power, and its object side is convex and its image side is concave. By arranging the first lens with light divergence and concave image side surface, the light-receiving range of the optical imaging lens group can be expanded, so that the incident light with a large angle is refracted through the object side surface and the image side surface of the first lens to form A beam closer to the optical axis.

The second lens has negative refractive power, and its object side is concave and its image side is convex. By arranging the second lens with negative refractive power behind the first lens, the light can be further adjusted The direction of travel reduces imaging aberrations. The object side of the second lens is concave, which helps to reduce the angle between the light and the optical axis after the light passes through the object side of the second lens.

The third lens has a positive refractive power, and its object side is convex and its image side is convex. The third lens is used as a lens element that mainly adjusts the optical path, provides the main positive refractive power of the optical imaging lens group, and is used for converging the divergent light beams formed by the first lens and the second lens.

The fourth lens has positive refractive power, and its object side is convex and its image side is convex; the fifth lens has negative refractive power, and its object side is concave, and its image side can be convex or concave. Wherein, the fourth lens and the fifth lens are bonded to each other to form a cemented lens. By arranging the fourth lens and the fifth lens with positive refractive power and negative refractive power, spherical aberration, field curvature aberration and chromatic aberration can be effectively corrected.

The sixth lens has positive refractive power, and its object side surface is convex. By arranging the sixth lens with positive refractive power behind the fifth lens, the rear focal length of the optical imaging lens group can be shortened. Preferably, the object side and/or the image side of the sixth lens may be an aspherical surface.

The combined focal length of the fourth lens and the fifth lens of the optical imaging lens group is f45, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 4<f45/EFL<18 (1); Satisfying the condition of the relational formula (1) helps to properly distribute the positive refractive power of the optical imaging lens group to the cemented lens composed of the third lens and the fourth and fifth lenses, and helps to reduce chromatic aberration.

The radius of curvature of the object side surface of the first lens of the optical imaging lens group is R1, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied: 4<R1/EFL<8 (2); By satisfying the condition of the relational formula (2), the curvature radius of the object side surface of the first lens can be controlled, which helps to form a wide-angle optical imaging lens group structure.

The focal length of the third lens of the optical imaging lens group is f3, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied: 2.5<f3/EFL<5 (3); by satisfying the relationship The condition of formula (3) is beneficial to reduce the volume of the optical imaging lens group while maintaining good optical performance. If f3/EFL is lower than the lower limit of the relational formula (3), the positive refractive power of the third lens is too large, and the distance between the third lens and the imaging surface is likely to be too short, making it difficult to set the fourth lens to the sixth lens ; If f3/EFL is higher than the upper limit of the relationship (3), the positive refractive power of the third lens is insufficient to balance the negative refractive power of the first lens and the second lens.

The curvature radius of the image side surface of the second lens of the optical imaging lens group is R4, and the curvature radius of the third lens image side surface is R6, which satisfy the following relationship: 1<R6/R4<17 (4); by satisfying the relationship The condition of formula (4) can control the curvature radii of the image sides of the second lens and the third lens to maintain an appropriate ratio, which is helpful to properly distribute the refractive power of the second lens and the third lens. If R6/R4 is lower than the lower limit of the relational formula (4), the refractive power of the second lens will be too large; if R6/R4 is higher than the upper limit of the relational formula (4), the refractive power of the second lens will be easily caused Too weak is not conducive to correcting aberrations.

The focal length of the first lens of the optical imaging lens group is f1, and the focal length of the second lens is f2, which satisfy the following relational formula: 3<f2/f1<25 (5); by satisfying the condition of relational formula (5) , the negative refractive power of the front end of the optical imaging lens group can be properly distributed to the first lens and the second lens, which is helpful to form a wide viewing angle structure.

The focal length of the fourth lens of the optical imaging lens group is f4, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied: 1.4<f4/EFL<2.3 (6); by satisfying the relationship The condition of formula (6) helps to maintain an appropriate ratio between the focal length of the fourth lens and the effective focal length of the entire optical imaging lens group.

The focal length of the sixth lens of the optical imaging lens group is f6, and the following relationship is satisfied between it and the effective focal length EFL of the overall optical imaging lens group: 2.8<f6/EFL<4.5 (7); by satisfying the relationship The condition of formula (7) is helpful to control the focal length of the sixth lens and the effective focal length of the overall optical imaging lens group, and maintain an appropriate ratio between the two.

The composite focal length of the first lens, the second lens and the third lens of the optical imaging lens group is f123, which satisfies the following relational formula: 2.6<f123/EFL<7.3 (8); by satisfying the relational formula (8) If the conditions are met, the combination of the first lens, the second lens and the third lens can have an appropriate positive refractive power, which is beneficial to adjust the light path and reduce the imaging aberration.

The distance on the optical axis from the object side of the first lens of the optical imaging lens group to the imaging plane of the optical imaging lens group is TTL, the distance on the optical axis from the image side of the first lens to the object side of the second lens is AT12, and the distance on the optical axis is AT12. The distance from the image side of the three lenses to the object side of the fourth lens on the optical axis is AT34, which satisfies the following relation: 2.7<TTL/(AT12+AT34)<4.4 (9); by satisfying the condition of relation (9) , the distance between the first lens and the second lens and the distance between the third lens and the fourth lens can be controlled, which is beneficial to the miniaturization of the optical imaging lens group.

The radius of curvature of the object side of the first lens of the optical imaging lens group is R1, and the radius of curvature of the image side of the first lens is R2, which satisfy the following relationship: 3.2<R1/R2<6.8 (10); by satisfying the condition of relational formula (10), the ratio of the curvature radius of the object side surface and the image side surface of the first lens can be controlled, which is beneficial to the formation of a wide viewing angle lens group structure.

The dispersion coefficient of the fourth lens element of the optical imaging lens group is Vd4, and the dispersion coefficient of the fifth lens element is Vd5, which satisfy the following relationship: 60<Vd4+Vd5<90 (11); and Vd4>Vd5 (12); By satisfying the conditions of the relational expressions (11) and (12), it is beneficial to correct the chromatic aberration of the optical imaging lens group.

The dispersion coefficient of the first lens of the optical imaging lens group is Vd1, the dispersion coefficient of the second lens is Vd2, and the dispersion coefficient of the third lens is Vd3, which satisfy the following relationship: (Vd1+Vd2+Vd3)<120 ( 13); By satisfying the condition of the relational formula (13), it is beneficial to reduce the chromatic aberration of the optical imaging lens group.

The focal length of the third lens of the optical imaging lens group is f3, the dispersion coefficient of the third lens is Vd3, the dispersion coefficient of the fifth lens is Vd5, and the effective focal length EFL of the overall optical imaging lens group, The following relationship is satisfied Formula: 5<f3*Vd3/(Vd5*EFL)<8.5 (14); by satisfying the condition of relational formula (14), it is beneficial to select the materials of the third lens and the fifth lens, and reduce the imaging aberration.

The curvature radius of the image side surface of the fourth lens of the optical imaging lens group is R8, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied: -1.4<R8/EFL<-2.6 (15) ; By satisfying the condition of relational expression (15), the curvature radius of the cemented surface of the fourth lens and the fifth lens can be appropriately controlled, which is beneficial to reduce the field curvature aberration and correct the chromatic aberration of the optical imaging lens group.

The distance on the optical axis of the image side of the first lens of the optical imaging lens group to the object side of the second lens is AT12, and the thickness of the first lens on the optical axis is CT1, which satisfies the following relationship: 2<AT12/CT1 <10 (16); By satisfying the condition of the relational expression (16), the thickness of the first lens and the ratio of the distance between the first lens and the second lens can be appropriately controlled.

The distance from the image side of the sixth lens of the optical imaging lens group to the imaging surface of the optical imaging lens group on the optical axis is BFL, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied: 0.09 <BFL/TTL<0.18 (17); by satisfying the condition of relational expression (17), the optical imaging lens group can have an appropriate back focal length, which is beneficial to improve the imaging quality.

Several specific embodiments are provided below, together with the corresponding drawings, to describe the optical imaging lens set of the present invention in detail.

first embodiment

Referring to FIG. 1A and FIG. 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 (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right according to the first embodiment of the present invention.

As shown in FIG. 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 and sixth lens 16 . The optical imaging lens set 10 can further include a filter element 17 , a protective glass 18 and an imaging surface 19 . An image sensing element 100 can be further disposed on the imaging surface 19 to form an imaging device (not marked).

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 first lens 11 is made of glass material.

The second lens 12 has a negative 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 spherical. The second lens 12 is made of glass material.

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 third lens 13 is made of glass material.

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

The fifth lens 15 has a negative refractive power, the object side 15a is concave, the image side 15b is concave, and both the object side 15a and the image side 15b are spherical. The fifth lens 15 is made of glass material.

The sixth lens 16 has a positive refractive power, the object side 16a is convex, the image side 16b is concave, and both the object side 16a and the image side 16b are aspherical. The sixth lens 16 is made of plastic material.

The filter element 17 is disposed between the sixth lens 16 and the imaging surface 19 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 17a and 17b of the filter element 17 are both flat surfaces, and the material is glass.

The protective glass 18 is disposed on the image sensing element 100 , the two surfaces 18 a and 18 b are both flat surfaces, and the material is glass.

The image sensing device 100 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a 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 whose distance from the optical axis is Y 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; R: the lens at the near optical axis The curvature radius of ; K: the cone coefficient; and Ai: the i-th order aspheric coefficient.

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens assembly 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, the image side 11b is marked as the surface 11b, and so on for other lens surfaces. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I. For example, the distance from the object side 11a of the first lens 11 to the image side 11b is 0.573mm, which means that the thickness of the first lens 11 is 0.573mm mm. The distance from the image side 11b of the first lens 11 to the object side 12a of the second lens 12 is 3.689 mm. Others can be deduced by analogy, 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, and half of the maximum viewing angle of the entire optical imaging lens group 10 is HFOV (Half Field of View), and the numerical values are also listed in Table 1.

Please refer to Table 2 below, which is the aspheric coefficient of each surface of the sixth lens of the first embodiment of the present invention. Among them, K is the cone coefficient in the aspheric curve equation, and A ₄ to A ₁₄ represent the 4th to 14th order aspheric coefficients of each surface. For example, the cone coefficient K of the object side surface 16a of the sixth lens 16 is -0.821. Others can be deduced by analogy, and will not be repeated below. In addition, the tables of the following embodiments correspond to the optical imaging lens sets of the respective embodiments, and the definitions of the tables are the same as those of the present embodiment, so they will not be repeated in the following embodiments.

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 EFL of the optical imaging lens group 10 is f45/EFL=10.59.

In the first embodiment, the relationship between the curvature radius R1 of the object side surface 11 of the first lens 11 and the effective focal length EFL of the optical imaging lens group 10 is R1/EFL=4.50.

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=3.03.

In the first embodiment, the relationship between the curvature radius R6 of the image side surface 13b of the third lens 13 and the curvature radius R4 of the image side surface 12b of the second lens 12 is R6/R4=2.96.

In the first embodiment, the relationship between the focal length f1 of the first lens 11 and the focal length f2 of the second lens 12 is f2/f1=10.60.

In the first embodiment, the relationship between the effective focal length EFL of the fourth lens 14 and the optical imaging lens group 10 is f4/EFL=1.58.

In the first embodiment, the relationship between the effective focal length EFL of the sixth lens 16 and the optical imaging lens group 10 is f6/EFL=3.73.

In the first embodiment, the relationship between the combined focal length f123 of the first lens 11 , the second lens 12 and the third lens 13 and the effective focal length EFL of the optical imaging lens group 10 is f123/EFL=3.13.

In the first embodiment, the distance TTL from the object side 11 a of the first lens 11 to the imaging plane 19 of the optical imaging lens group 10 on the optical axis is the same as the distance TTL between the image side 11 b of the first lens 11 and the object side 19 of the second lens 12 . The distance AT12 between 12a on the optical axis, and the distance AT34 between the image side 13b of the third lens 13 and the object side 14a of the fourth lens 14 on the optical axis, the relationship between the three is TTL/(AT12+AT34)=3.48.

In the first embodiment, the relationship between the curvature radius R1 of the object side surface 11a of the first lens 11 and the curvature radius R2 of the image side surface 11b is R1/R2=3.95.

In the first embodiment, the relationship between the dispersion coefficient Vd4 of the fourth lens element 14 and the dispersion coefficient Vd5 of the fifth lens element 15 is Vd4+Vd5=67.1, and Vd4>Vd5.

In the first embodiment, the relationship between the dispersion coefficient Vd1 of the first lens 11, the dispersion coefficient Vd2 of the second lens 12 and the dispersion coefficient Vd3 of the third lens 13 is (Vd1+Vd2+Vd3)=107.6.

In the first embodiment, the relationship between the distance AT12 on the optical axis between the image side 11b of the first lens 11 and the object side 12a of the second lens 12 and the thickness CT1 of the first lens 11 on the optical axis is AT12 /CT1=6.44.

In the first embodiment, the distance BFL from the image side 16b of the sixth lens 16 to the imaging plane 19 on the optical axis is on the optical axis with the object side 11a of the first lens 11 to the imaging plane 19 of the optical imaging lens group 10 on the optical axis. The above distance TTL, the relationship between the two is BFL/TTL=0.14.

In the first embodiment, the relationship between the focal length f3 and dispersion coefficient Vd3 of the third lens element 13, the dispersion coefficient Vd5 of the fifth lens element 15 and the effective focal length EFL of the optical imaging lens group 10 is f3*Vd3/(Vd5 *EFL)=5.59.

In the first embodiment, the relationship between the curvature radius R8 of the image side surface 14b of the fourth lens 14 and the effective focal length EFL of the optical imaging lens group 10 is R8/EFL=-1.71.

From the numerical values of the above-mentioned relational expressions, it can be known that the optical imaging lens assembly 10 of the first embodiment satisfies the requirements of relational expressions (1) to (17).

Referring to FIG. 1B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram, and the 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 light of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within ±0.04mm; the meridional aberration is within the focal length of the entire field of view. The variation is within ±0.01mm; and the distortion aberration can be controlled within 11%. As shown in FIG. 1B , the optical imaging lens assembly 10 of this embodiment has corrected various aberrations well, 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 assembly according to a second embodiment of the present invention. FIG. 2B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) 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 first embodiment includes a first lens 21 , a second lens 22 , a third lens 23 , a diaphragm ST, a fourth lens 24 , a fifth lens 24 and a fifth lens in sequence from the object side to the image side. lens 25 and sixth lens 26 . The optical imaging lens group 20 may further include a filter element 27 , a protective glass 28 and an imaging surface 29 . An image sensing element 200 can be further disposed on the imaging surface 29 to form an imaging device (not marked).

The first lens 21 has a 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 first lens 21 is made of glass material.

The second lens 22 has a negative 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 spherical. The second lens 22 is made of glass material.

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

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

The fifth lens 25 has a negative refractive power, the object side 25a is concave, the image side 25b is concave, and both the object side 25a and the image side 25b are spherical. The fifth lens 25 is made of glass material.

The sixth lens 26 has a positive refractive power, the object side 26a is convex, the image side 26b is convex, and both the object side 26a and the image side 26b are aspherical. The sixth lens 26 is made of plastic material.

The filter element 27 is disposed between the sixth lens 26 and the imaging surface 29 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). Both surfaces 27a and 27b of the filter element 27 are flat surfaces, and the material is glass.

The protective glass 28 is disposed on the image sensing element 200 , the two surfaces 28 a and 28 b are both flat surfaces, and the material is glass.

The image sensing device 200 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 20 of the second embodiment and the aspheric coefficients of each surface of the sixth lens 26 are listed in Tables 3 and 4, respectively. In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment.

In the second embodiment, the numerical 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 the relational expressions (1) to (17).

Referring to FIG. 2B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the 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 light of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within ±0.02mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within ±0.01mm; and the distortion aberration can be controlled within 12%. As shown in FIG. 2B , the optical imaging lens group 20 of this embodiment has corrected various aberrations well, 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 assembly according to a third embodiment of the present invention. 3B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 3A , the optical imaging lens group 30 of the first embodiment includes a first lens 31 , a second lens 32 , a third lens 33 , an aperture ST, a fourth lens 34 , a fifth lens 34 and a fifth lens in sequence from the object side to the image side. lens 35 and sixth lens 36 . The optical imaging lens group 30 can further include a filter element 37 , a protective glass 38 and an imaging surface 39 . An image sensing element 300 can be further disposed on the imaging surface 39 to form an imaging device (not marked).

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

The second lens 32 has a negative 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 spherical. The second lens 32 is made of glass material.

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 third lens 33 is made of glass material.

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

The fifth lens 35 has a negative refractive power, the object side 35a is concave, the image side 35b is concave, and both the object side 35a and the image side 35b are spherical. The fifth lens 35 is made of glass material.

The sixth lens 36 has a positive refractive power, the object side 36a is convex, the image side 36b is convex, and both the object side 36a and the image side 36b are aspherical. The sixth lens 36 is made of plastic material.

The filter element 37 is disposed between the sixth lens 36 and the imaging surface 39 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 37a and 37b of the filter element 37 are both flat surfaces, and the material is glass.

The protective glass 38 is disposed on the image sensing element 300 , the two surfaces 38 a and 38 b are both flat surfaces, and the material is glass.

The image sensing device 300 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 30 of the third embodiment and the aspheric coefficients of each surface of the sixth lens 36 are listed in Table 6 and Table 7, respectively. In the third embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment.

In the third embodiment, the numerical values of the relational expressions of the optical imaging lens group 30 are listed in Table 8. It can be seen from Table 8 that the optical imaging lens group 30 of the third embodiment satisfies the requirements of the relational expressions (1) to (17).

Referring to FIG. 3B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature 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 light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point. The deviation can be controlled within ±0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within ±0.03mm; the focal length of the meridional aberration in the entire field of view The variation is within ±0.01mm; and the distortion aberration can be controlled within 10%. As shown in FIG. 3B , the optical imaging lens group 30 of this embodiment has corrected various aberrations well, 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 assembly according to a fourth embodiment of the present invention. 4B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

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

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

The second lens 42 has a negative 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 spherical. The second lens 42 is made of glass material.

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 third lens 43 is made of glass material.

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

The fifth lens 45 has a negative refractive power, the object side 45a is concave, the image side 45b is concave, and both the object side 45a and the image side 45b are spherical. The fifth lens 45 is made of glass material.

The sixth lens 46 has a positive refractive power, the object side 46a is convex, the image side 46b is convex, and both the object side 46a and the image side 46b are aspherical. The sixth lens 46 is made of plastic material.

The filter element 47 is disposed between the sixth lens 46 and the imaging surface 49 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 47a and 47b of the filter element 47 are both flat surfaces, and the material is glass.

The protective glass 48 is disposed on the image sensing element 400 , the two surfaces 48 a and 48 b are both flat surfaces, and the material is glass.

The image sensing device 400 is, for example, a charge-coupled device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 40 of the fourth embodiment and the aspheric coefficients of each surface of the sixth lens 46 are listed in Table 9 and Table 10, respectively. In the fourth embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment.

In the fourth embodiment, the numerical 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 the relational expressions (1) to (17).

Referring to FIG. 4B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature 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 light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.01mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within ±0.01mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within ±0.02mm; and the distortion aberration can be controlled within 13%. As shown in FIG. 4B , the optical imaging lens group 40 of this embodiment has corrected various aberrations well, 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 assembly according to a fifth embodiment of the present invention. 5B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

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

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

The second lens 52 has a negative 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 spherical. The second lens 52 is made of glass material.

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

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

The fifth lens 55 has a negative refractive power, the object side 55a is concave, the image side 55b is concave, and both the object side 55a and the image side 55b are spherical. The fifth lens 55 is made of glass material.

The sixth lens 56 has a positive refractive power, the object side 56a is convex, the image side 56b is convex, and both the object side 56a and the image side 56b are aspherical. The sixth lens 56 is made of plastic material.

The filter element 57 is disposed between the sixth lens 56 and the imaging surface 59 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). Both surfaces 57a and 57b of the filter element 57 are flat surfaces, and the material is glass.

The protective glass 58 is disposed on the image sensing element 500 , the two surfaces 58 a and 58 b are both flat surfaces, and the material is glass.

The image sensing device 500 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 50 of the fifth embodiment and the aspheric coefficients of the surfaces of the sixth lens 56 are listed in Table 12 and Table 13, respectively. In the fifth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment.

In the fifth embodiment, the numerical 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 the relational expressions (1) to (17).

Referring to FIG. 5B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 50 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within ±0.03mm; the focal length of the meridional aberration in the entire field of view The variation is within ±0.02mm; and the distortion aberration can be controlled within within 10%. As shown in FIG. 5B , the optical imaging lens group 50 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system.

Sixth Embodiment

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

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

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

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

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

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

The fifth lens 65 has a negative refractive power, the object side 65a is concave, the image side 65b is concave, and both the object side 65a and the image side 65b are spherical. The fifth lens 65 is made of glass material.

The sixth lens 66 has a positive refractive power, the object side 66a is convex, the image side 66b is concave, and both the object side 66a and the image side 66b are aspherical. The sixth lens 66 is made of plastic material.

The filter element 67 is disposed between the sixth lens 66 and the imaging surface 69 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 67a and 67b of the filter element 67 are both flat surfaces, and the material is glass.

The protective glass 68 is disposed on the image sensing element 600 , the two surfaces 68 a and 68 b are both flat surfaces, and the material is glass.

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

The detailed optical data of the optical imaging lens group 60 of the sixth embodiment and the aspheric coefficients of the surfaces of the sixth lens 66 are listed in Table 15 and Table 16, respectively. In the sixth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment.

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

Referring to FIG. 6B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 60 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.02mm. From the astigmatic field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within ±0.02mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within ±0.03mm; and the distortion aberration can be controlled within 12%. As shown in FIG. 6B , the optical imaging lens group 60 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system.

Seventh Embodiment

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

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

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

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

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

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

The fifth lens 75 has a negative refractive power, the object side 75a is concave, the image side 75b is concave, and both the object side 75a and the image side 75b are spherical. The fifth lens 75 is made of glass material.

The sixth lens 76 has a positive refractive power, the object side 76a is convex, the image side 76b is concave, and both the object side 76a and the image side 76b are aspherical. The sixth lens 76 is made of plastic material.

The filter element 77 is disposed between the sixth lens 76 and the imaging surface 79 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 77a and 77b of the filter element 77 are both flat surfaces, and the material is glass.

The protective glass 78 is disposed on the image sensing element 700 , the two surfaces 78 a and 78 b are both flat surfaces, and the material is glass.

The image sensing device 700 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 70 of the seventh embodiment and the aspheric coefficients of the surfaces of the sixth lens 76 are listed in Table 18 and Table 19, respectively. In the seventh embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment.

In the seventh embodiment, the numerical values of the relational expressions of the optical imaging lens group 70 are listed in Table 20. It can be seen from Table 20 that the optical imaging lens group 70 of the seventh embodiment satisfies the requirements of the relational expressions (1) to (17).

Referring to FIG. 7B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 70 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.01mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within ±0.03mm; the focal length of the meridional aberration in the entire field of view The variation is within ±0.01mm; and the distortion aberration can be controlled within 20%. As shown in FIG. 7B , the optical imaging lens group 70 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system.

Eighth Embodiment

Referring to FIG. 8A and FIG. 8B , FIG. 8A is a schematic diagram of an optical imaging lens assembly 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 (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right according to the eighth embodiment of the present invention.

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

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

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

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

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

The fifth lens 85 has a negative refractive power, the object side 85a is concave, the image side 85b is convex, and both the object side 85a and the image side 85b are spherical. The fifth lens 85 is made of glass material.

The sixth lens 86 has a positive refractive power, the object side 86a is convex, the image side 86b is concave, and both the object side 86a and the image side 86b are aspherical. The sixth lens 86 is made of plastic material.

The filter element 87 is disposed between the sixth lens 86 and the imaging surface 89 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 87a and 87b of the filter element 87 are both flat surfaces, and the material is glass.

The protective glass 88 is disposed on the image sensing element 800 , the two surfaces 88 a and 88 b are both flat surfaces, and the material is glass.

The image sensing device 800 is, for example, a charge-coupled device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 80 of the eighth embodiment and the aspheric coefficients of the surfaces of the sixth lens 86 are listed in Table 21 and Table 22, respectively. In the eighth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment.

In the eighth embodiment, the numerical values of the relational expressions of the optical imaging lens group 80 are listed in Table 23. It can be seen from Table 23 that the optical imaging lens group 80 of the eighth embodiment satisfies the requirements of the relational expressions (1) to (17).

表二十三

Table 23

Referring to FIG. 8B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the 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 light of the three visible light wavelengths of 470 nm, 550 nm and 650 nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within ±0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 550nm) that the focal length variation of the sagittal aberration in the entire field of view is within ±0.03mm; the focal length of the meridional aberration in the entire field of view The variation is within ±0.02mm; and the distortion aberration can be controlled within 15%. As shown in FIG. 8B , the optical imaging lens group 80 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system.

10: Optical imaging lens group

11: The first lens

12: Second lens

13: The third lens

14: Fourth lens

15: Fifth lens

16: Sixth lens

17: Filter element

18: Protective glass

19: Imaging surface

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

11b: Image side of the first lens

12a: The side of the object of the second lens

12b: Side of the image of the second lens

13a: The side of the object of the third lens

13b: Side view of the image of the third lens

14a: The side of the object of the fourth lens

14b: The image side of the fourth lens

15a: The side of the object of the fifth lens

15b: Side view of the image of the fifth lens

16a: The side of the object of the sixth lens

16b: Side view of the image of the sixth lens

17a, 17b: The second surface of the filter element

18a, 18b: The second surface of the protective glass

100: Image Sensing Components

I: Optical axis

ST: Aperture

Claims (17)

An optical imaging lens group, comprising in sequence from the object side to the image side: a first lens with negative refractive power, whose object side is convex, and whose image side is concave; a second lens, with negative refractive power, whose object side is concave; It is concave and the image side is convex; a third lens has positive refractive power, its object side is convex, and its image side is convex; an aperture, a fourth lens has positive refractive power, its object side is convex, and its image side is convex. is convex; a fifth lens has negative refractive power, and its object side is concave, wherein the fourth lens and the fifth lens form a cemented lens; and a sixth lens has positive refractive power, and its object side is Convex; wherein, the total number of lenses in the optical imaging lens group is six; the composite focal length of the first lens, the second lens and the third lens is f123, and the composite focal length of the fourth lens and the fifth lens is f45 , the radius of curvature of the object side surface of the first lens is R1, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relations: 2.6<f123/EFL<7.3; 4<f45/EFL<18; and 4<R1 /EFL<8. According to the optical imaging lens set of claim 1, wherein the focal length of the third lens is f3, which satisfies the following relationship: 2.5<f3/EFL<5. For the optical imaging lens set of claim 1, wherein, the radius of curvature of the image side surface of the second lens is R4, and the radius of curvature of the image side surface of the third lens is R6, which satisfy the following relationship: 1<R6/R4 <17. An optical imaging lens group, comprising in sequence from the object side to the image side: A first lens with negative refractive power, the object side is convex, and the image side is concave; a second lens, with negative refractive power, its object side is concave, and the image side is convex; a third lens, with positive refractive force, the object side is convex, the image side is convex; an aperture, a fourth lens, with positive refractive power, its object side is convex, the image side is convex; a fifth lens, with negative refractive power, its object side is a concave surface, wherein the fourth lens and the fifth lens form a cemented lens; and a sixth lens has a positive refractive power, and its object side is convex; wherein, the total number of lenses in the optical imaging lens group is six; The focal length of the third lens is f3, the combined focal length of the first lens, the second lens and the third lens is f123, the effective focal length of the optical imaging lens group is EFL, and the radius of curvature of the image side surface of the second lens is R4, the radius of curvature of the image side surface of the third lens is R6, which satisfies the following relations: 2.5<f3/EFL<5; 2.6<f123/EFL<7.3; and 1<R6/R4<17. According to the optical imaging lens set of item 1 or item 4 of the scope of application, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following relationship is satisfied: 3<f2/f1<25 . According to the optical imaging lens set of item 1 or item 4 of the claimed scope, wherein, the focal length of the fourth lens is f4, which satisfies the following relationship: 1.4<f4/EFL<2.3. According to the optical imaging lens set of claim 1 or claim 4, the focal length of the sixth lens is f6, which satisfies the following relationship: 2.8<f6/EFL<4.5. For the optical imaging lens group of item 1 or item 4 of the scope of application, the distance from the object side of the first lens to the imaging plane of the optical imaging lens group on the optical axis is TTL, and the image side of the first lens is TTL The distance from the object side of the second lens on the optical axis is AT12, and the distance from the image side of the third lens to the fourth lens on the optical axis is AT34, which satisfy the following relationship: 2.7<TTL/(AT12+AT34) <4.4. For the optical imaging lens set according to item 1 or item 4 of the scope of the patent application, wherein, the radius of curvature of the object side surface of the first lens is R1, and the radius of curvature of the image side surface of the first lens is R2, which satisfy the following relationship: 3.2 <R1/R2<6.8. For the optical imaging lens set of item 1 or item 4 of the scope of application, wherein the dispersion coefficient of the fourth lens is Vd4, and the dispersion coefficient of the fifth lens is Vd5, which satisfy the following relationship: 60<Vd4+Vd5< 90; and Vd4>Vd5. For the optical imaging lens set as claimed in item 1 or item 4 of the scope of the patent application, the dispersion coefficient of the first lens is Vd1, the dispersion coefficient of the second lens is Vd2, and the dispersion coefficient of the third lens is Vd3. The following relationship is satisfied: (Vd1+Vd2+Vd3)<120. For the optical imaging lens set of item 1 or item 4 of the scope of application, wherein the focal length of the third lens is f3, the dispersion coefficient of the third lens is Vd3, and the dispersion coefficient of the fifth lens is Vd5, which satisfy The following relationship: 5<f3*Vd3/(Vd5*EFL)<8.5. According to the optical imaging lens set of item 1 or item 4 of the claimed scope, wherein, the radius of curvature of the image side surface of the fourth lens is R8, which satisfies the following relational formula: -1.4<R8/EFL<-2.6. The optical imaging lens set according to item 1 or item 4 of the claimed scope, wherein the distance on the optical axis from the image side of the first lens to the object side of the second lens is AT12, and the distance between the first lens on the optical axis is AT12. The thickness is CT1, which satisfies the following relation: 2<AT12/CT1<10. According to the optical imaging lens group of item 1 or item 4 of the scope of application, wherein the distance from the image side surface of the sixth lens to the imaging surface of the optical imaging lens group on the optical axis is BFL, and the object side surface of the first lens is BFL. The distance between the imaging plane of the optical imaging lens group on the optical axis is TTL, which satisfies the following relational formula: 0.09<BFL/TTL<0.18. An imaging device, comprising the optical imaging lens group as claimed in item 1 or 4 of the claimed 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 comprising the imaging device as claimed in item 16 of the patent application scope.

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