TWM581700U - Optical imaging lens and imaging device - Google Patents

Abstract

An optical imaging lens includes, in order from an object side to an image side, a first lens group having negative refractive power, an aperture stop and a second lens group having positive refractive power. The first lens group includes, in order from the object side to the image side, a first lens having negative refractive power and including an image-side surface being concave, and a second lens having positive refractive power and including an object-side surface being concave and an image-side surface being convex. The second lens group includes, in order from the object side to the image side, a third lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, a fourth lens having negative refractive power and including an object-side surface and an image-side surface, wherein an off-axial region of the object side surface and the image-side surface are concave, and a fifth lens having positive refractive power and including an object-side surface being convex. With specified conditions being satisfied, sufficient field of view could be provided and the aberrations of the system can be corrected in order to obtain good image quality.

Description

Optical imaging lens group and imaging device

The present invention relates to an optical imaging device, and more particularly to an optical imaging lens set that can be used in a vehicle photographic device, a monitoring system, or a portable electronic device, and an imaging device having the optical imaging lens group.

With the advancement of semiconductor process technology, image sensing components (such as CCD and CMOS Image Sensor) of the photographic device can meet the requirements of size miniaturization, thereby improving the manufacturing convenience of the Miniaturized Camera and driving digital electronic products. A small photographic device is being installed to provide a trend in image capturing functions. However, in addition to the trend of miniaturization of the photographic device, in order to meet the needs of consumers, the photographic device is also developed toward higher resolution and higher lens specifications, such as a large aperture ratio, a large angle of view, and Lower manufacturing costs.

It is known that an anti-distance camera lens has a wide angle and a large aperture. Such a lens is usually composed of a front lens group having a negative refractive power and a rear lens group having a positive refractive power. Taking U.S. Patent No. 7,623,305 as an example, it includes a first mirror group having a negative refractive power, an aperture, and a second mirror group having a positive refractive power; the first mirror group includes a first lens having a negative refractive power and having a positive refractive index The second lens of the force, the second mirror group includes a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power. Wherein, the first lens and the second lens of the patent are both meniscus lenses, and the first lens includes a convex side surface, a concave image side surface, and the second lens includes a convex side surface and a concave surface The side of the image. Although the distortion of the lens imaging can be reduced under this architecture, when the angle of view becomes large, other aberrations (such as field curvature aberration) become difficult to correct.

The present invention provides an optical imaging lens group comprising, in order from the object side to the image side, a first mirror group having a negative refractive power, an aperture, and a second mirror group having a positive refractive power. The first lens group includes a first lens and a second lens, wherein the first lens has a negative refractive power and the image side is a concave surface; the second lens has a positive refractive power, the object side surface is a concave surface, and the image side surface is a convex surface. And the object side surface and the image side surface of the second lens are aspherical surfaces. The second lens group includes a third lens, a fourth lens, and a fifth lens, wherein the third lens has a positive refractive power, the object side surface is a convex surface, the image side surface thereof is a convex surface, and the fourth lens has a negative refractive power, and The off-axis and the image side of the object surface of the fourth lens are concave; the fifth lens has a positive refractive power, and the object side surface is a convex surface, and the object side and the image side surface of the third lens, the fourth lens, and the fifth lens are both The aspherical surface; the total number of lenses of the optical imaging lens group is five. The optical imaging lens group satisfies the following relationship: 1 < f3 / EFL < 1.35; and 2.5 < f2 / EFL < 4.5; wherein EFL is the effective focal length of the optical imaging lens group, and f2 is the focal length of the second lens, F3 is the focal length of the third lens.

According to an embodiment of the present invention, the first lens satisfies the following relationship: 0.95<(C1+C2)/(C2-C1)<1.15; wherein C1 and C2 are the object side and the image side of the first lens, respectively. Curvature.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: |Φ1/Nd1+Φ2/Nd2+Φ3/Nd3+Φ4/Nd4+Φ5/Nd5|<0.02; wherein Φ1 to Φ5 are respectively The refractive power of the first to fifth lenses, Nd1 to Nd5 are the refractive indices of the first to fifth lenses, respectively.

According to an embodiment of the present invention, the second lens satisfies the following relationship: 0.35 < R4 / R3 < 0.5; wherein R3, R4 are the curvature radii of the object side and the image side of the second lens, respectively.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: 0.6<AT2/AT1<2; wherein AT1 is the distance from the image side of the first lens to the object side of the second lens on the optical axis. AT2 is the distance from the image side of the second lens to the object side of the third lens on the optical axis.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: 2.5<AT2/(AT3+AT4)<5; wherein AT2 is the image side of the second lens to the side of the third lens. The distance on the axis, AT3 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and AT4 is the distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: Nd4>Nd5; and Vd4<Vd5; wherein Nd4 and Nd5 are refractive indices of the fourth lens and the fifth lens, respectively, Vd4 and Vd5 respectively The dispersion coefficient of the fourth lens and the fifth lens. Preferably, the fourth lens has a dispersion coefficient Vd4 < 30, and the fifth lens has a dispersion coefficient Vd5 > 55.

According to an embodiment of the present invention, the third lens satisfies the following relationship: −0.95<R6/R5<−0.7; wherein R5 and R6 are the curvature radii of the object side and the image side of the third lens, respectively.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: -1.3 < f1/EFL < -1.0; wherein f1 is the focal length of the first lens.

According to an embodiment of the present invention, the optical imaging lens group satisfies the following relationship: 5.2 < TTL / ImgH < 5.7; wherein, ImgH is the maximum image height of the optical imaging lens group, and TTL is the object side of the first lens The distance to the imaging plane of the optical imaging lens group on the optical axis.

The present invention further provides an imaging apparatus comprising the optical imaging lens group as described above and an image sensing element.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following embodiments are described in detail below with reference to the accompanying drawings. However, the following descriptions and drawings are for illustrative purposes only and are not intended to limit the present invention. The scope.

10, 20, 30, 40, 50, 60, 70, 80‧‧‧ optical imaging lens sets

11, 21, 31, 41, 51, 61, 71, 81‧‧‧ 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

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

11b, 21b, 31b, 41b, 51b, 61b, 71b, 81b‧‧‧ 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‧‧‧ 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‧‧‧ 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‧‧‧ 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‧‧‧ image side of the fifth lens

16a, 16b, 26a, 26b, 36a, 36b, 46a, 46b, 56a, 56b, 66a, 66b, 76a, 76b, 86a, 86b ‧ ‧ ‧ two surfaces of the filter element

16, 26, 36, 46, 56, 66, 76, 86‧‧‧ Filter elements

17, 27, 37, 47, 57, 67, 77, 87 ‧ ‧ imaging surface

100, 200, 300, 400, 500, 600, 700, 800‧‧‧ image sensing components

G1‧‧‧ first mirror group

G2‧‧‧Second mirror group

I‧‧‧ optical axis

ST‧‧‧ aperture

1A is a schematic view of the optical imaging lens unit of the first embodiment of the present invention.

FIG. 1B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the first embodiment, which are sequentially composed from left to right.

2A is a schematic view of the optical imaging lens unit of the second embodiment of the present invention.

FIG. 2B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the second embodiment, which are sequentially composed from left to right.

Fig. 3A is a schematic view showing the optical imaging lens unit of the third embodiment of the present invention.

FIG. 3B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the third embodiment, which are sequentially composed from left to right.

4A is a schematic view of the optical imaging lens unit of the fourth embodiment of the present invention.

4B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the fourth embodiment, which are sequentially composed from left to right.

Fig. 5A is a schematic view showing the optical imaging lens unit of the fifth embodiment of the present invention.

FIG. 5B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the fifth embodiment, which are sequentially composed from left to right.

Fig. 6A is a schematic view showing the optical imaging lens unit of the sixth embodiment of the present invention.

FIG. 6B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the sixth embodiment, which are sequentially composed from left to right.

Fig. 7A is a schematic view showing the optical imaging lens unit of the seventh embodiment of the present invention.

FIG. 7B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the seventh embodiment, which are sequentially composed from left to right.

Fig. 8A is a schematic view showing the optical imaging lens unit of the eighth embodiment of the present invention.

FIG. 8B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram, and a distortion aberration diagram of the eighth embodiment, which are sequentially composed from left to right.

The present invention provides an optical imaging lens group that sequentially includes a first mirror group having a negative refractive power, an aperture, and a second mirror group having a positive refractive power from the object side to the image side. The first lens group sequentially includes a first lens and a second lens from the object side to the image side, wherein the first lens has a negative refractive power and the image side is a concave surface; the second lens has a positive refractive power, and the object side has a concave surface The image side surface is convex, and the object side surface and the image side surface of the second lens are aspherical surfaces. The second lens group sequentially includes a third lens, a fourth lens and a fifth lens from the object side to the image side, wherein the third lens has a positive refractive power, and both the object side surface and the image side surface are convex surfaces; the fourth lens has a negative a refractive power, and the off-axis and image side surfaces of the object side of the fourth lens are concave; the fifth lens has a positive refractive power, the object side surface is a convex surface; and the third lens, the fourth lens, and the fifth lens object side and image The sides are all aspherical; the total number of lenses of this optical imaging lens group is five.

In the following embodiments, the lenses of the optical imaging lens group may be made of glass or plastic, and are not limited to the materials listed in the embodiments. In the embodiment of the present invention, each of the lenses includes a side facing the object and an image side facing the imaging surface. Side and side of each object Both include a surface area near the optical axis (hereinafter referred to as the near optical axis) and a surface area away from the optical axis (hereinafter referred to as the off-axis).

When the first mirror group having a negative refractive power and the second mirror group having a positive refractive power are sequentially arranged from the object side to the image side, an anti-distance imaging lens group (Retrofocus Lens) may be formed to provide a longer period. Back Focal Length. The long back focal length allows the incident light to reach the surface of the image sensing element (for example, a solid-state imaging element such as a Charge-Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS)). A smaller angle of incidence, thereby increasing the brightness of the center-to-edge position of the imaging element.

The first lens of the first mirror group has a negative refractive power, and the image side surface is concave to increase the light receiving range, so that the entire optical imaging lens group can have a larger viewing angle. The first mirror group and the second mirror group respectively comprise a second lens having a positive refractive power and a third lens as an element for adjusting the optical path, so that the incident light passes through the first lens to form a divergent light, and then sequentially passes through the first The two lenses and the third lens become light beams closer to the optical axis. Wherein, the focal length of the second lens of the first mirror group is f2, the focal length of the third lens of the second mirror group is f3, and the effective focal length of the entire optical imaging lens group is EFL, which satisfies the following relationship :1<f3/EFL<1.35 (1); and 2.5<f2/EFL<4.5 (2); by satisfying the relations (1) and (2), the optical imaging lens group can have a good imaging effect and Larger field of view. Wherein, if f3/EFL is lower than the lower limit of the formula (1), the field curvature aberration will be increased and it is difficult to correct; if f3/EFL is higher than the upper limit of the formula (1), the optical The imaging image height of the imaging lens group is too small. If f2/EFL is lower than the lower limit of equation (2) or higher than the upper limit of equation (1), the path of the incident beam cannot be effectively adjusted.

Preferably, the optical imaging lens group satisfies 1 < f3 / EFL < 1.28 (3).

Preferably, the optical imaging lens group satisfies 3.5 < f2 / EFL < 4.3 (4).

The curvatures of the first lens object side and the image side surface are C1 and C2, respectively. When the optical imaging lens group satisfies the following relation (5), the diameter of the first lens can be reduced, and the volume of the optical imaging lens group can be effectively reduced. .

0.95<(C1+C2)/(C2-C1)<1.15; (5)

When the formula (5) is lower than the lower limit value, the object side surface of the first lens is excessively curved toward the image side surface, and it is difficult to receive a large angle of incident light; and when the formula (5) is higher than the upper limit value thereof, the first lens The curvature of the side of the object becomes larger, which will reduce the image height on the image plane.

The refractive powers of the first to fifth lenses are respectively Φ1 to Φ5, and the refractive indices of the first to fifth lenses are respectively Nd1 to Nd5, and when the optical imaging lens group satisfies the following relation (6), The field curvature aberration of the optical imaging lens group is effectively corrected.

|Φ1/Nd1+Φ2/Nd2+Φ3/Nd3+Φ4/Nd4+Φ5/Nd5|<0.02; (6)

The curvature radius of the side surface and the image side surface of the second lens object is R3 and R4, and when the optical imaging lens group satisfies the following relational expression (7), it is advantageous to correct the field curvature aberration.

0.3<R4/R3<0.5; (7)

The distance from the side of the first lens image to the side of the second lens object on the optical axis is AT1, and the distance from the side of the second lens image to the side of the third lens object on the optical axis is AT2, when the optical imaging lens group satisfies the following relationship In the case of the formula (8), the spherical aberration, coma, and field curvature of the optical imaging lens group can be effectively controlled.

0.6<AT2/AT1<2.0; (8)

Further, the distance from the side of the third lens image to the side of the fourth lens object on the optical axis is AT3, and the distance from the side of the fourth lens image side to the side of the fifth lens object on the optical axis is AT4, when the optical imaging lens group satisfies In the following relation (9), the chromatic aberration of the optical imaging lens group can be effectively corrected.

2.5<AT2/(AT3+AT4)<5.0; (9)

The refractive indices of the fourth lens and the fifth lens are respectively Nd4 and Nd5, and the dispersion coefficients of the fourth lens and the fifth lens are Vd4 and Vd5, respectively. When the optical imaging lens group satisfies the following relation (10), The chromatic aberration of the optical imaging lens group is effectively corrected.

Nd4>Nd5; and Vd4<Vd5; (10)

Further, when the optical imaging lens group satisfies the following relation (11), the chromatic aberration of the optical imaging lens group can be corrected well.

Vd4<30; and Vd5>55; (11)

The radius of curvature of the side surface and the image side surface of the third lens is R5 and R6. When the optical imaging lens group satisfies the following relation (12), it is advantageous to shift the principal plane of the third lens toward the image side. To help expand the field of view.

-0.95<R6/R5<-0.7; (12)

The focal length of the first lens is f1, and when the optical imaging lens group satisfies the following relation (13), the first lens can be provided with a suitable negative refractive power.

-1.3<f1/EFL<-1.0; (13)

The maximum image height of the optical imaging lens group on the imaging surface 17 is ImgH (the maximum image height is defined as one half of the diagonal of the effective sensing region of the image sensing element), and the first lens side to the optical The distance of the imaging surface of the imaging lens group on the optical axis is TTL, and when the optical imaging lens group satisfies the following relation (14), the purpose of miniaturization of the optical imaging lens group can be achieved.

5.2<TTL/ImgH<5.7; (14)

First embodiment

1A and 1B, FIG. 1A is a schematic view showing the optical imaging lens unit of the first embodiment. FIG. 1B is a longitudinal Spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the first embodiment in this order from left to right.

As shown in FIG. 1A, the optical imaging lens group 10 of the first embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 11 and a second lens 12, and the second mirror group G2 sequentially includes a third lens 13, a fourth lens 14, and a fifth lens 15 from the object side to the image side. The optical imaging lens group 10 of the first embodiment may further include a filter element 16 and an imaging surface 17, wherein the filter element 16 is disposed between the fifth lens 15 and the imaging surface 17. The image sensing element 100 can be disposed on the imaging surface 17 to form an imaging device (not otherwise labeled) with the optical imaging lens group 10.

The first lens 11 has a negative refractive power, and the object side surface 11a is a flat surface, the image side surface 11b is a concave surface, and the image side surface 11b is a spherical surface, and the material thereof is glass.

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

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

The fourth lens 14 has a negative refractive power, and the object side surface 14a is convex at the near optical axis, concave at the off-axis, and the image side surface 14b is concave, and the object side surface 14a and the image side surface 14b are aspherical surfaces. For plastic.

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

The filter element 16 is disposed between the fifth lens 15 and the imaging surface 17, and both surfaces 16a and 16b are flat and made of glass. The filter element 16 is, for example, an IR filter.

The image sensing device 100 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The above equations for each aspheric surface are expressed as follows:

Where X is the distance between the point on the aspheric surface from the optical axis Y and 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 Curvature radius; K: cone coefficient; and Ai: i-th order aspheric coefficient.

The effective focal length of the optical imaging lens group 10 of the first embodiment is EFL, the aperture value (F-number) is Fno, and the distance from the object side of the first lens 11 to the imaging surface 17 on the optical axis I (Total Track Length) is TTL, one of the maximum viewing angles of the overall optical imaging lens group is HFOV (Half Field of View), and one half of the diagonal of the effective sensing area of the image sensing element 100 on the imaging surface 17 is the maximum image height ImgH (Image Height). The values are as follows: EFL = 4.55 mm, Fno = 2.08, TTL = 20.98 mm, HFOV = 53.2 degrees, and ImgH = 3.692 mm.

In the optical imaging lens group 10 of the first embodiment, the focal length of the second lens 12 is f2, and the focal length of the third lens 13 is f3, and the relationship is f2/EFL = 4.18, and f3/EFL = 1.167.

In the optical imaging lens group 10 of the first embodiment, the curvature of the object side surface 11a of the first lens 11 is C1, and the curvature of the image side surface 11b is C2, and the relationship is: (C1+C2)/(C2-C1)= 1.

In the optical imaging lens group 10 of the first embodiment, the refractive power of the first lens 11 is Φ1, the refractive power of the second lens 12 is Φ2, the refractive power of the third lens 13 is Φ3, and the refractive power of the fourth lens 14 is Φ4, the refractive power of the fifth lens 15 is Φ5, and the refractive index of the first lens 11 is Nd1, the refractive index of the second lens 12 is Nd2, the refractive index of the third lens 13 is Nd3, and the refractive index of the fourth lens 14 The refractive index of Nd4 and fifth lens 15 is Nd5, and the relationship is: Φ1/Nd1+Φ2/Nd2+Φ3/Nd3+Φ4/Nd4+Φ5/Nd5=0.0014.

In the optical imaging lens group 10 of the first embodiment, the radius of curvature of the object side surface 12a of the second lens 12 is R3, and the radius of curvature of the image side surface 12b is R4, and the relationship is: R4/R3 = 0.432.

In the optical imaging lens group 10 of the first embodiment, the distance from the image side surface 11b of the first lens 11 to the object side surface 12a of the second lens 12 on the optical axis I is AT1, and the image side surface 12b of the second lens 12 is the first The distance of the object side surface 13a of the three lens 13 on the optical axis I is AT2, and the relational expression is AT2/AT1=1.186.

In the optical imaging lens group 10 of the first embodiment, the distance from the image side surface 13b of the third lens 13 to the object side surface 14a of the fourth lens 14 on the optical axis I is AT3, and the image side surface 14b of the fourth lens 14 is the first The distance of the object side surface 15a of the five lens 15 on the optical axis I is AT4, and the relational expression is: AT2/(AT3+AT4)=4.306.

In the optical imaging lens group 10 of the first embodiment, the refractive index and the dispersion coefficient of the fourth lens 14 are Nd4 and Vd4, and the refractive index and the dispersion coefficient of the fifth lens 15 are Nd5 and Vd5, and the relationship is: Nd4= 1.633, Nd5 = 1.511; Vd4 = 23.2, Vd5 = 57.1.

In the optical imaging lens group 10 of the first embodiment, the radius of curvature of the object side surface 13a of the third lens 13 is R5, and the radius of curvature of the image side surface 13b is R6, and the relationship is: R6/R5 = -0.769.

In the optical imaging lens group 10 of the first embodiment, the focal length of the first lens 11 is f1, and the effective focal length EFL of the entire optical imaging lens group 10 satisfies the following condition: f1/EFL = -1.11.

In the optical imaging lens group 10 of the first embodiment, the maximum image height ImgH is between the object side surface 11a of the first lens 11 and the distance TTL of the imaging surface 17 on the optical axis I, and the following condition is satisfied: TTL / ImgH = 5.683.

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens group of the first embodiment. Wherein, the object side surface 11a of the first lens 11 is denoted as the surface 11a, the image side surface 11b is denoted as the surface 11b, and the other lens surfaces are similarly pushed; the surface of the table labeled ASP, for example, the object side surface 12a of the second lens 12, It means that the surface is aspherical. The value of the distance field in the table represents the distance from the surface to the next surface, for example, the distance from the object side surface 11a to the image side surface 11b of the first lens 11 is 0.7 mm, and the thickness of the first lens 11 is 0.7 mm. 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 1.608 mm. The distance from the image side surface 12b of the second lens 12 to the diaphragm ST is 0.05 mm. Others can be deduced by analogy, and will not be repeated below.

Please refer to Table 2, which is the aspherical coefficient of each lens surface of the first embodiment of the creation. Where K is the cone coefficient in the aspheric curve equation, and A4 to A10 represent the 4th to 10th aspheric coefficients of each surface. For example, the taper coefficient K of the object side surface 12a of the second lens 12 is -79.5. 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 groups of the respective embodiments, and the definitions of the respective tables are the same as those of the present embodiment, and therefore will not be further described in the following embodiments.

Second embodiment

2A and 2B, FIG. 2A is a schematic view of the optical imaging lens unit of the second embodiment. 2B is a longitudinal spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the second embodiment.

As shown in FIG. 2A, the optical imaging lens group 20 of the second embodiment includes a first mirror group G1 having a negative refractive power, a diaphragm ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 21 and a second lens 22, and the second mirror group G2 sequentially includes a third lens 23, a fourth lens 24, and a fifth lens 25 from the object side to the image side. The optical imaging lens group 20 of the second embodiment may further include a filter element 26 and an imaging surface 27, wherein the filter element 26 is disposed on the fifth lens 25 and Between the imaging faces 27. The image sensing element 200 can be disposed on the imaging surface 27 to form an imaging device (not otherwise labeled) with the optical imaging lens group 20.

The first lens 21 has a negative refractive power, and the object side surface 21a is a flat surface, the image side surface 21b is a concave surface, and the image side surface 21b is a spherical surface, and the material thereof is glass.

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

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

The fourth lens 24 has a negative refractive power, and the object side surface 24a is convex at the near optical axis, concave at the off-axis, and the image side surface 24b is concave, and the object side surface 24a and the image side surface 24b are aspherical surfaces. For plastic.

The fifth lens 25 has a positive refractive power, and the object side surface 25a is a convex surface, and the image side surface 25b is concave at the near optical axis, convex at the off-axis, and aspherical, and the material is plastic.

The filter element 26 is disposed between the fifth lens 25 and the imaging surface 27, and both surfaces 26a and 26b are flat and made of glass. The filter element 26 is, for example, an IR filter.

The image sensing element 200 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 20 of the second embodiment and the aspherical coefficients of the lens surface are shown in Tables 3 and 4. In the second embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Tables 3 and 4, the data in Table 5 can be calculated. The definitions of the parameters shown in Table 5 are the same as those in the first embodiment, and therefore will not be described herein.

Third embodiment

3A and 3B, FIG. 3A is a schematic view of the optical imaging lens unit of the third embodiment. FIG. 3B is a longitudinal Spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the third embodiment.

As shown in FIG. 3A, the optical imaging lens group 30 of the third embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 31 and a second lens 32, and the second mirror group G2 sequentially includes a third lens 33, a fourth lens 34, and a fifth lens 35 from the object side to the image side. The optical imaging lens group 30 of the third embodiment may further include a filter element 36 and an imaging surface 37, wherein the filter element 36 is disposed between the fifth lens 35 and the imaging surface 37. The image sensing element 300 can be disposed on the imaging surface 37 to form an imaging device (not otherwise labeled) with the optical imaging lens group 30.

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

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

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

The fourth lens 34 has a negative refractive power, and the object side surface 34a is convex at the near optical axis, concave at the off-axis, and the image side surface 34b is concave, and the object side surface 34a and the image side surface 34b are aspherical surfaces. For plastic.

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

The filter element 36 is disposed between the fifth lens 35 and the imaging surface 37, and both surfaces 36a and 36b are flat and made of glass. The filter element 36 is, for example, an IR filter.

The image sensing element 300 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 30 of the third embodiment and the aspherical coefficients of the lens surface are shown in Tables 6 and 7. In the third embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Tables 6 and 7, the data in Table 8 can be calculated. The definitions of the parameters shown in Table 8 are the same as those in the first embodiment, and therefore will not be described here.

Fourth embodiment

4A and 4B, FIG. 4A is a schematic view of the optical imaging lens unit of the fourth embodiment. 4B is a longitudinal spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the fourth embodiment.

As shown in FIG. 4A, the optical imaging lens group 40 of the fourth embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 41 and a second lens 42. The second mirror group G2 sequentially includes a third lens 43, a fourth lens 44, and a fifth lens 45 from the object side to the image side. The optical imaging lens group 40 of the fourth embodiment may further include a filter element 46 and an imaging surface 47, wherein the filter element 46 is disposed between the fifth lens 45 and the imaging surface 47. The image sensing element 400 can be disposed on the imaging surface 47 to form an imaging device (not otherwise labeled) with the optical imaging lens group 40.

The first lens 41 has a negative refractive power, and the object side surface 41a is a flat surface, the image side surface 41b is a concave surface, and the image side surface 41b is a spherical surface, and the material thereof is glass.

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

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

The fourth lens 44 has a negative refractive power, and the object side surface 44a is convex at the near optical axis, concave at the off-axis, and the image side surface 44b is concave, and the object side surface 44a and the image side surface 44b are aspherical surfaces. For plastic.

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

The filter element 46 is disposed between the fifth lens 45 and the imaging surface 47, and both surfaces 46a and 46b are flat and made of glass. The filter element 46 is, for example, an IR filter.

The image sensing element 400 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 40 of the fourth embodiment and the aspherical coefficients of the lens surface are shown in Tables 9 and 10. In the fourth embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Table 9 and Table 10, the data in Table 11 can be calculated. The definitions of the parameters shown in Table 11 are the same as those in the first embodiment, and therefore will not be described herein.

Fifth embodiment

5A and 5B, FIG. 5A is a schematic view of the optical imaging lens unit of the fifth embodiment. FIG. 5B is a longitudinal Spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the fifth embodiment from left to right.

As shown in FIG. 5A, the optical imaging lens group 50 of the fifth embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 51 and a second lens 52, and the second mirror group G2 sequentially includes a third lens 53, a fourth lens 54, and a fifth lens 55 from the object side to the image side. The optical imaging lens group 50 of the fifth embodiment may further include a filter element 56 and an imaging surface 57, wherein the filter element 56 is disposed between the fifth lens 55 and the imaging surface 57. The image sensing element 500 can be disposed on the imaging surface 57 to form an imaging device (not otherwise labeled) with the optical imaging lens group 50.

The first lens 51 has a negative refractive power, and the object side surface 51a is a flat surface, the image side surface 51b is a concave surface, and the image side surface 51b is a spherical surface, and the material thereof is glass.

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

The third lens 53 has a positive refractive power, and the object side surface 53a is a convex surface, and the image side surface 53b is a convex surface, and both are aspherical surfaces, and the material thereof is glass.

The fourth lens 54 has a negative refractive power, and the object side surface 54a is convex at the near optical axis, concave at the off-axis, and the image side surface 54b is concave, and the object side surface 54a and the image side surface 54b are aspherical surfaces. For plastic.

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

The filter element 56 is disposed between the fifth lens 55 and the imaging surface 57, and both surfaces 56a and 56b are flat and made of glass. The filter element 56 is, for example, an IR filter.

The image sensing element 500 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 50 of the fifth embodiment and the aspherical coefficients of the lens surface are shown in Table 12 and Table 13. In the fifth embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Table 12 and Table 13, the data in Table 14 can be calculated. The definitions of the parameters shown in Table 14 are the same as those in the first embodiment, and therefore will not be described herein.

Sixth embodiment

6A and 6B, FIG. 6A is a schematic view of the optical imaging lens unit of the sixth embodiment. FIG. 6B is a longitudinal Spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the sixth embodiment from left to right.

As shown in FIG. 6A, the optical imaging lens group 60 of the sixth embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 61 and a second lens 62, and the second mirror group G2 sequentially includes a third lens 63, a fourth lens 64, and a fifth lens 65 from the object side to the image side. The optical imaging lens group 60 of the sixth embodiment may further include a filter element 66 and an imaging surface 67, wherein the filter element 66 is disposed between the fifth lens 65 and the imaging surface 67. The image sensing element 600 can be disposed on the imaging surface 67 to form an imaging device (not otherwise labeled) with the optical imaging lens group 60.

The first lens 61 has a negative refractive power, and the object side surface 61a is a flat surface, the image side surface 61b is a concave surface, and the image side surface 61b is a spherical surface, and the material thereof is glass.

The second lens 62 has a positive refractive power, and the object side surface 62a is a concave surface, and the image side surface 62b is a convex surface, and both are aspherical surfaces, and the material thereof is plastic.

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

The fourth lens 64 has a negative refractive power, and the object side surface 64a is convex at the near optical axis, concave at the off-axis, and the image side surface 64b is concave, and the object side surface 64a and the image side surface 64b are aspherical surfaces. For plastic.

The fifth lens 65 has a positive refractive power, and the object side surface 65a is a convex surface, and the image side surface 65b is a convex surface, and both are aspherical surfaces, and the material thereof is plastic.

The filter element 66 is disposed between the fifth lens 65 and the imaging surface 67, and both surfaces 66a and 66b are flat and made of glass. The filter element 66 is, for example, an IR filter.

The image sensing element 600 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 60 of the sixth embodiment and the aspherical coefficients of the lens surface are shown in Tables 15 and 16. In the sixth embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Table 15 and Table 16, the data in Table 17 can be calculated. The definition of each parameter shown in Table 17 is the same as that of the first embodiment, and therefore will not be described herein.

Seventh embodiment

Referring to FIG. 7A and FIG. 7B, FIG. 7A is a schematic view showing the optical imaging lens unit of the seventh embodiment. FIG. 7B is a longitudinal Spherical Aberration, an Astigmatism, and a Distortion of the seventh embodiment of the present invention from left to right.

As shown in FIG. 7A, the optical imaging lens group 70 of the seventh embodiment includes a first mirror group G1 having a negative refractive power, a diaphragm ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 71 and a second lens 72, and the second mirror group G2 sequentially includes a third lens 73, a fourth lens 74, and a fifth lens 75 from the object side to the image side. The optical imaging lens group 70 of the seventh embodiment may further include a filter element 76 and an imaging surface 77, wherein the filter element 76 is disposed between the fifth lens 75 and the imaging surface 77. The image sensing element 700 can be disposed on the imaging surface 77 to form an imaging device (not otherwise labeled) with the optical imaging lens assembly 70.

The first lens 71 has a negative refractive power, and the object side surface 71a is a flat surface, the image side surface 71b is a concave surface, and the image side surface 71b is a spherical surface, and the material is glass.

The second lens 72 has a positive refractive power, and the object side surface 72a is a concave surface, and the image side surface 72b is a convex surface, and both are aspherical surfaces, and the material thereof is plastic.

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

The fourth lens 74 has a negative refractive power, and the object side surface 74a is convex at the near optical axis, concave at the off-axis, and the image side surface 74b is concave, and the object side surface 74a and the image side surface 74b are aspherical surfaces. For plastic.

The fifth lens 75 has a positive refractive power, and the object side surface 75a is a convex surface, and the image side surface 75b is a convex surface, and both of them are aspherical surfaces, and the material thereof is plastic.

The filter element 76 is disposed between the fifth lens 75 and the imaging surface 77, and both surfaces 76a and 76b are flat and made of glass. The filter element 76 is, for example, an IR filter.

The image sensing element 700 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 70 of the seventh embodiment and the aspherical coefficients of the lens surface are shown in Tables 18 and 19. In the seventh embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Table 18 and Table 19, the data of Table 20 can be calculated. The definitions of the parameters shown in Table 20 are the same as those in the first embodiment, and therefore will not be described herein.

Eighth embodiment

8A and 8B, FIG. 8A is a schematic view of the optical imaging lens unit of the eighth embodiment. FIG. 8B is a longitudinal Spherical Aberration, an astigmatic aberration diagram, and a distortion aberration diagram of the eighth embodiment from left to right.

As shown in FIG. 8A, the optical imaging lens group 80 of the eighth embodiment includes a first mirror group G1 having a negative refractive power, an aperture ST, and a second mirror group G2 having a positive refractive power, wherein the first mirror group G1 is composed of The object side to the image side sequentially include a first lens 81 and a second lens 82, and the second mirror group G2 sequentially includes a third lens 83, a fourth lens 84, and a fifth lens 85 from the object side to the image side. The optical imaging lens group 80 of the eighth embodiment may further include a filter element 86 and an imaging surface 87, wherein the filter element 86 is disposed between the fifth lens 85 and the imaging surface 87. The image sensing element 800 can be disposed on the imaging surface 87 to form an imaging device (not otherwise labeled) with the optical imaging lens group 80.

The first lens 81 has a negative refractive power, and the object side surface 81a is a flat surface, the image side surface 81b is a concave surface, and the image side surface 81b is a spherical surface, and the material is glass.

The second lens 82 has a positive refractive power, and the object side surface 82a is a concave surface, and the image side surface 82b is a convex surface, and both of them are aspherical surfaces, and the material thereof is plastic.

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

The fourth lens 84 has a negative refractive power, and the object side surface 84a is a concave surface. The image side surface 84b is concave at both the low beam axis and the off-axis, and the object side surface 84a and the image side surface 84b are aspherical surfaces, and the material is plastic. .

The fifth lens 85 has a positive refractive power, and the object side surface 85a is a convex surface, and the image side surface 85b is a convex surface, and both of them are aspherical surfaces, and the material thereof is plastic.

The filter element 86 is disposed between the fifth lens 85 and the imaging surface 87, and both surfaces 86a and 86b are flat and made of glass. The filter element 86 is, for example, an IR filter.

The image sensing element 800 is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor.

The detailed optical data of the optical imaging lens group 80 of the eighth embodiment and the aspherical coefficients of the lens surface are shown in Table 21 and Table 22. In the eighth embodiment, the aspherical curve equation represents the form as in the first embodiment.

According to Table 21 and Table 22, the data in Table 23 can be calculated. The definitions of the parameters shown in Table XXIII are the same as those of the first embodiment, and therefore will not be described herein.

Ninth embodiment

The ninth embodiment of the present invention is an image forming apparatus comprising the optical imaging lens group as in the foregoing embodiment, and an image sensing element. The image sensing element is, for example, an image sensor (Charge-Coupled Device, CCD) or a complementary metal-oxide-semiconductor (CMOS) image sensor. The image forming apparatus is, for example, a vehicle photographing device, a portable electronic product photographing device, or a surveillance camera or the like.

Although the present invention has been described using the foregoing embodiments, these embodiments are not intended to limit the scope of the present invention. Various changes in form and detail may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, it should be understood that the creation is subject to the definition of the following patent application, and any changes made within the scope of the patent application or its equivalent should still fall into the application for this creation. Within the scope of the patent.

Claims (17)

An optical imaging lens set comprising, from the object side to the image side, in sequence:  a first lens group having a negative refractive power, comprising a first lens and a second lens, wherein the first lens has a negative refractive power, and the image side of the first lens is concave, and the second lens has a positive refractive power, a side surface of the second lens is a concave surface, an image side surface of the second lens is a convex surface, and an object side surface and an image side surface of the second lens are aspherical surfaces;  An aperture; and  a second lens group having a positive refractive power, comprising a third lens, a fourth lens and a fifth lens, wherein the third lens has a positive refractive power, and the object side of the third lens is a convex surface, The image side of the third lens is a convex surface; the fourth lens has a negative refractive power, and the off-axis and image side surfaces of the object side of the fourth lens are concave; the fifth lens has a positive refractive power, and the fifth lens The side surface of the object is a convex surface, and the object side surface and the image side surface of the third lens, the fourth lens and the fifth lens are aspherical surfaces; wherein the total number of lenses of the optical imaging lens group is five, and f2 is The focal length of the second lens, f3 is the focal length of the third lens, and the EFL is the effective focal length of the optical imaging lens group, which satisfies the following relationship:  1<f3/EFL<1.35; and  2.5< f2/EFL<4.5.   The optical imaging lens unit of claim 1, wherein the first lens satisfies the following relationship: 0.95 < (C1 + C2) / (C2 - C1) < 1.15; wherein C1 and C2 are respectively the first The curvature of the object side and image side of the lens. The optical imaging lens group of claim 1, wherein the optical imaging lens group satisfies the following relationship: ; among them, 1 to 5 is a refractive power of the first lens to the fifth lens, respectively, and Nd1 to Nd5 are refractive indices of the first lens to the fifth lens, respectively. The optical imaging lens unit of claim 1, wherein the second lens satisfies the following relationship: 0.3<R4/R3<0.5; wherein R3 and R4 are respectively the object side and the image side of the second lens. Radius of curvature. The optical imaging lens unit of claim 1, wherein the optical imaging lens group satisfies the following relationship: 0.6 < AT2 / AT1 < 2; wherein AT1 is the image side of the first lens to the second lens The distance of the side of the object on the optical axis, AT2 is the distance from the image side of the second lens to the object side of the third lens on the optical axis. The optical imaging lens unit of claim 1, wherein the optical imaging lens group satisfies the following relationship: 2.5<AT2/(AT3+AT4)<5; wherein AT2 is the image side of the second lens to The distance of the side surface of the third lens on the optical axis, AT3 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis, and AT4 is the image side of the fourth lens to the fifth The distance of the side of the lens from the optical axis. The optical imaging lens unit of claim 1, wherein the optical imaging lens group satisfies the following relationship: Nd4>Nd5; and Vd4<Vd5; wherein Nd4 and Nd5 are the fourth lens and the fifth lens, respectively The refractive index, Vd4, Vd5, respectively, the dispersion coefficient of the fourth lens and the fifth lens. The optical imaging lens unit of claim 7, wherein the fourth lens has a dispersion coefficient Vd4 < 30, and the fifth lens has a dispersion coefficient Vd5 > 55. The optical imaging lens unit of claim 1, wherein the third lens satisfies the following relationship: -0.95 < R6/R5 < -0.7; wherein R5 and R6 are respectively the object side and image of the third lens The radius of curvature of the side. The optical imaging lens group of claim 1, wherein the optical imaging lens group further satisfies the following relationship: 1 < f3 / EFL < 1.28. The optical imaging lens group of claim 1, wherein the optical imaging lens group further satisfies the following relationship: 3.5 < f2 / EFL < 4.3. The optical imaging lens group of claim 1, wherein the optical imaging lens group further satisfies the following relationship:  -1.3 < f1/EFL < -1.0; where f1 is the focal length of the first lens.   The optical imaging lens group of claim 1, wherein the optical imaging lens group satisfies the following relationship: 5.2 < TTL / ImgH < 5.7; wherein ImgH is the maximum image height of the optical imaging lens group, and the TTL is The distance from the object side of the first lens to the imaging surface of the optical imaging lens group on the optical axis. The optical imaging lens unit of claim 1, wherein the object side of the fourth lens is convex at the near optical axis. The optical imaging lens unit of claim 1, wherein the material of the first lens is glass. The optical imaging lens unit of claim 1, wherein the material of the third lens is glass. An image forming apparatus comprising the optical imaging lens group of claim 1 and an image sensing element.