TWI721686B - Fingerprint identification module and optical imaging lens - Google Patents

Abstract

An optical imaging lens including a first to a third lens elements arranged in a sequence from an object side to an image side along an optical axis is provided. The refractive power of the first to the third lens elements are negative, positive and positive. An image-side surface of the first lens element is concave surface. An object-side surface of the second lens element is convex surface. An image-side surface of the third lens element is convex surface. Furthermore, a fingerprint identification module is also provided.

Description

Fingerprint recognition module and optical imaging lens

The present invention relates to an optical imaging lens and an optical function module, and particularly relates to an optical imaging lens and a fingerprint recognition module.

In response to the rapid development of electronic products, the application of macro lenses has also begun to appear. Its application areas are such as fingerprint recognition or macro shooting, but it is hoped that the design is thin and short. However, the current macro lens usually has a longer lens length (Total Track Length, TTL), which is not conducive to the thinning of the lens. In view of the above-mentioned problems, how to design a lens with good imaging quality, a short lens length and a macro lens has always been the direction for those skilled in the art.

The invention provides an optical imaging lens and a fingerprint recognition module, which can have good optical quality in a small volume.

In an embodiment of the present invention, an optical imaging lens is provided, which includes a first lens, a second lens, and a third lens in sequence along an optical axis from the object side to the image side. First pass The mirror to the third lens each include an object side surface facing the object side and passing imaging light rays, and an image side surface facing the image side and passing imaging light rays, and the lenses with diopter only have the above three lenses. The first lens has a negative refractive power, and the image side surface of the first lens is concave. The second lens has a positive refractive power, and the object side surface of the second lens is convex. The third lens has a positive refractive power, and the image side surface of the third lens is convex.

In an embodiment of the present invention, a fingerprint recognition module is provided, which includes a cover plate, the above-mentioned optical imaging lens, and an image sensor. The optical imaging lens is arranged downstream of the optical path of the cover plate. The image sensor is arranged downstream of the optical path of the optical imaging lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further includes an aperture, which is disposed between the second lens and the third lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: (R1+R2)/(R1-R2)<2, where R1 is the curvature radius of the object side surface of the first lens, and R2 Is the curvature radius of the image side surface of the first lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: (ET1-CT1)/(ET1+CT1)>0, where ET1 is passed through the two edges of the first lens and is in line with the optical axis. A thickness that is parallel, and CT1 represents a thickness that passes through the center of the first lens and is parallel to the optical axis.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: 1.86>(n1+n2+n3)/(n1*n2*n3)>0.85, where n1 is the refractive index of the first lens , N2 is the refractive index of the second lens, and n3 is the refractive index of the third lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens is more satisfied with The following conditional formula: 2.74≧tan(HFOV)≧0.92, where HFOV is the half angle of view of the optical imaging lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: 5≧TTL/ImgH≧1, where TTL represents a distance from the object side of the first lens to an imaging surface on the optical axis , ImgH is the image height of the optical imaging lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: 1.9≧|f/f1|≧0.4, where f represents the effective focal length of the optical imaging lens, and f1 represents the focal length of the first lens , And |f/f1| represents the absolute value of f/f1.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: 1.2≧f/f2≧0.1, where f represents the effective focal length of the optical imaging lens, and f2 represents the focal length of the second lens.

In an embodiment of the present invention, the above-mentioned optical imaging lens further satisfies the following conditional formula: it satisfies the following conditional formula: 1.8≧f/f3≧0.2, where f represents the effective focal length of the optical imaging lens, and f3 represents Is the focal length of the third lens.

Based on the above, in the optical imaging lens and fingerprint recognition module of the embodiment of the present invention, by satisfying the refractive index combination and surface design of the first to third lenses, it can be used in a small volume. It also has good optical quality.

0: aperture

1: the first lens

2: second lens

3: The third lens

211, 11, 21, 31, 221: Object side

212, 12, 22, 32, 222: like side

100: Optical imaging lens

200: Fingerprint recognition module

210: cover

220: filter

230: image sensor

C: The center of the first lens

CT1: Center thickness

E1, E2: Edge

ET1: Edge thickness

IP: imaging surface

I: Optical axis

IS: image side

OS: Object side

FIG. 1 is a schematic diagram of the fingerprint recognition module according to the first embodiment of the present invention.

2A to 2C are various aberration diagrams of the first embodiment.

Fig. 3 is a schematic diagram of a fingerprint recognition module according to a second embodiment of the present invention.

4A to 4C are various aberration diagrams of the second embodiment.

Fig. 5 is a schematic diagram of a fingerprint recognition module according to a third embodiment of the present invention.

6A to 6C are various aberration diagrams of the third embodiment.

FIG. 7 is a schematic diagram of a fingerprint recognition module according to a fourth embodiment of the present invention.

8A to 8C are various aberration diagrams of the fourth example.

FIG. 9 is a schematic diagram of a fingerprint recognition module according to a fifth embodiment of the present invention.

10A to 10C are various aberration diagrams of the fifth example.

In this specification, "the lens has positive refractive power (or negative refractive power)" means that the refractive power on the optical axis of the lens calculated by the Gaussian optics theory is positive (or negative). In the optical imaging lens, each lens is radially symmetrical to each other with the optical axis as the symmetry axis. Each lens has an object side and an image side opposite to the object side. The object side and the image side are defined as the surface through which the imaging light passes through the lens. The imaging light includes chief ray and marginal ray. The object side (or image side) has an area near the optical axis and an area near the circumference connected to and surrounding the area near the optical axis. The area near the optical axis is the area where the imaging light passes through the optical axis. The area near the circumference is the area passed by the edge rays.

``A lens surface (object side or image side) in the area near the optical axis (or area near the circumference) is convex or concave'' can be the intersection of the light (or light extension line) passing through the area in parallel with the optical axis in the image Side or object side to decide (light focus judgment the way). For example, when the light passes through this area, the light will focus toward the image side, and the focal point with the optical axis will be on the image side, and the area is a convex surface. On the contrary, if the light passes through the certain area, the light will diverge, and the focal point of the extension line and the optical axis is on the object side. The surface shape of the surface near the optical axis can be judged according to the judgment method of those skilled in the art, that is, the positive or negative R value (referring to the radius of curvature of the paraxial) is used to judge the unevenness. For the object side surface, when the R value is positive, the object side surface is determined to be convex in the area near the optical axis; when the R value is negative, the object side surface is determined to be concave in the area near the optical axis. For the image side surface, when the R value is positive, it is determined that the area near the optical axis of the image side surface is concave; when the R value is negative, it is determined that the area near the optical axis of the image side surface is convex.

FIG. 1 is a schematic diagram of a fingerprint recognition module according to a first embodiment of the present invention. 2A to 2C are various aberration diagrams of the first embodiment.

1, in the first embodiment, the fingerprint recognition module 200 includes a cover 210, an optical imaging lens 100, and an infrared filter which are sequentially arranged from the object side OS to the image side IS along the optical axis I 220 and image sensor 230. In other words, the optical imaging lens 100 is disposed downstream of the optical path of the cover 210, and the image sensor 230 is disposed downstream of the optical path of the optical imaging lens 100. The optical imaging lens 100 includes a first lens 1, a second lens 2, an aperture 0, and a third lens 3 in order from the object side OS to the image side IS along the optical axis I. When the light emitted by an object to be photographed (for example, a finger, not shown) enters the fingerprint recognition module 200, it sequentially passes through the cover 210, the first lens 1, the second lens 2, the aperture 0, and the third lens. After the lens 3 and the infrared filter 220, an image is formed on an imaging plane IP (Image Plane), where the imaging plane IP is, for example, the surface of the image sensor 230. The infrared filter 220 is arranged on the third lens 3 and Between the image surface IP. It is supplemented that the object side OS is the side facing the object to be photographed, and the image side IS is the side facing the imaging surface IP. The optical imaging lens 100 is, for example, used in a fingerprint recognition module, but in other embodiments, it can also be used in different optical lens modules such as a camera or a telescope lens, and the present invention is not limited to this. The above components will be explained in detail in the following paragraphs.

The cover 210 may include a finger pressure pad, a display panel, a touch display panel, or a combination of at least two of the above, which, for example, serves as a fingerprint pressing area for the user to press.

In this embodiment, the cover 210, the first lens 1 to the third lens 3 of the optical imaging lens 100, and the infrared filter 220 each have an object side surface 211, 11 that faces the object side and allows imaging light to pass through. , 21, 31, 221 and an image side surface 212, 12, 22, 32, 222 that faces the image side and allows imaging light to pass through. That is, the object side 211, 11, 21, 31, 221, and the image side 212, 12, 22, 32, 222 are defined as the range through which the imaging light passes.

The first lens 1 has a negative refractive power. The object side surface 11 of the first lens 1 is a convex surface, and the image side surface 12 is a concave surface. In this embodiment, both the object side surface 11 and the image side surface 12 of the first lens 3 are aspheric surfaces.

The second lens 2 has positive refractive power. The object side surface 21 of the second lens 2 is a convex surface, and the image side surface 22 is a concave surface. In this embodiment, both the object side surface 21 and the image side surface 22 of the second lens 2 are aspherical surfaces.

The third lens 3 has positive refractive power. The object side surface 31 of the third lens 3 is a convex surface, and the image side surface 32 thereof is a convex surface. In this embodiment, both the object side surface 31 and the image side surface 32 of the third lens 3 are aspherical.

In the optical imaging lens 100 of this embodiment, there are only the above three lenses with refractive power. Moreover, in this embodiment, the first lens 1 to the third lens 3 can be made of plastic material to meet the requirements of light weight, but it is not limited thereto. In another example, the first lens 1 to the third lens 3 may be made of glass material. In another example, at least one of the first lens 1 to the third lens 3 may be made of glass material, and the remaining lenses are made of plastic material.

The image sensor 230 is used to receive the imaging light from the optical imaging lens 100, which is, for example, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS, The present invention is not limited to this. When the image sensor 230 receives the imaging light from the optical imaging lens 100, it converts it into an electrical signal for a back-end processor (not shown) to perform calculations for identification The user's fingerprint.

Other detailed optical data of the optical imaging lens 100 of the first embodiment are shown in Table 1. In Table 1, the distance (mm) corresponding to the object side 11 of the first lens 1 is 0.200, which represents the distance from the object side 11 of the first lens 1 to the image side 12 of the first lens 1 on the optical axis I (that is, The thickness of the first lens 1 on the optical axis I) is 0.200 mm. The distance corresponding to the image side surface 12 of the first lens 1 is 0.211, which means that the distance from the image side surface 12 of the first lens 1 to the object side surface 21 of the second lens 2 on the optical axis I is 0.211 mm. The other fields of the spacing (mm) can be deduced by analogy, and will not be repeated below.

In this embodiment, the object side surfaces 11, 21, 31 and the image side surfaces 12, 22, 32 of the first lens 1 to the third lens 3 are all even-order aspheric surfaces, and these aspheric surfaces are based on the formula ( 1) Definition:

In formula (1), Y is the distance between the point on the aspherical curve and the optical axis I. Z is the depth of the aspheric surface. R is the radius of curvature of the lens surface near the optical axis I. K is the conic constant. A _{2 i} is the 2i-th order aspheric coefficient. The aspheric coefficients of the object side surface 11 of the first lens 1 to the image side surface 32 of the third lens 3 in formula (1) are shown in Table 2. Among them, the column number 11 in Table 2 indicates that it is the aspheric coefficient of the object side surface 11 of the first lens 1, and the other columns can be deduced by analogy. Among them, A _{2 is} all 0 so it is omitted.

The relationship among the important parameters in the optical imaging lens 100 of the first embodiment is shown in Table 3 below.

Among them, EFL is the system focal length of the optical imaging lens 100; ET1 is a thickness (or edge thickness) that passes through the two edges E1 and E2 of the first lens 1 and is parallel to the optical axis I; CT1 represents the thickness that passes through the first lens 1. The center C and a thickness on the optical axis I (or center thickness); HFOV is the half angle of view of the optical imaging lens 100; Fno is the aperture value of the optical imaging lens 100; R1 is the radius of curvature of the object side surface 11 of the first lens 1; R2 is the radius of curvature of the image side surface 12 of the first lens 1; TTL (total length of the lens) is the object side surface 11 of the first lens 1 to the imaging surface IP on the optical axis I In addition, redefine: f1 is the focal length of the first lens 1; f2 is the focal length of the second lens 2; f3 is the focal length of the third lens 3; |f/f1| is the absolute value of f/f1; n1 Is the refractive index of the first lens 1; n2 is the refractive index of the second lens 2; and n3 is the refractive index of the third lens 3.

Also refer to Figures 2A to 2C. The diagrams of Figures 2A and 2B respectively illustrate the imaging of the first embodiment when the wavelength is 430nm, 450nm, 530nm, 500nm, 550nm. On the plane 100, the field curvature aberration in the Sagittal direction and the field curvature aberration in the Tangential direction are related to the field curvature aberration of the tangential direction. The diagram in FIG. 2C illustrates the first embodiment when the wavelength is 430 nm, Distortion Aberration on the imaging surface IP at 450nm, 500nm, 530nm, and 580nm.

In the two field curvature aberration diagrams in FIGS. 2A and 2B, the focal length variation of the three representative wavelengths within the entire field of view falls within ±0.14 mm. The distortion aberration diagram in FIG. 2C shows that the distortion aberration of the first embodiment is maintained within the range of ±0.8%. It can be seen from this that the optical imaging lens 100 of the first embodiment can have good optical imaging quality under the condition that the total length of the lens has been shortened to about 2.40 mm.

FIG. 3 is a schematic diagram of a fingerprint recognition module according to the second embodiment of the present invention. 4A to 4C are various aberration diagrams of the second embodiment. Please refer to FIG. 3 first. A second embodiment of the fingerprint recognition module 200 of the present invention is roughly similar to the first embodiment, and the differences between the two are as follows: optical data, aspheric coefficients, and these lenses 1, The parameters of 2 and 3 are more or less different.

Other detailed optical data of the second embodiment are shown in Table 4 below. In the second embodiment, the aspheric coefficients of the object side surface 11 of the first lens 1 to the image side surface 52 of the fifth lens 5 in formula (1) are shown in Table 5:

The relationship among the important parameters in the optical imaging lens 10 of the second embodiment is shown in Table 6.

In the two field curvature aberration diagrams in FIGS. 4A and 4B, the focal length variation of the three representative wavelengths within the entire field of view falls within ±0.12 mm. The distortion aberration diagram in FIG. 4C shows that the distortion aberration of the second embodiment is maintained within a range of ±1.4%. Based on this, it can be seen that the optical imaging lens 100 of the second embodiment has Under the condition of shortening to about 2.03 mm, it can have good optical imaging quality.

FIG. 5 is a schematic diagram of a fingerprint recognition module according to the third embodiment of the present invention. 6A to 6C are various aberration diagrams of the third embodiment. Please refer to FIG. 3 first, a third embodiment of the fingerprint recognition module 200 of the present invention is roughly similar to the first embodiment, and the differences between the two are as follows: optical data, aspheric coefficients, and these lenses 1, The parameters of 2 and 3 are more or less different.

Other detailed optical data of the third embodiment are shown in Table 7 below. In the third embodiment, the aspheric coefficients of the object side surface 11 of the first lens 1 to the image side surface 52 of the fifth lens 5 in formula (1) are shown in Table 8:

The relationship among the important parameters in the optical imaging lens 100 of the third embodiment is shown in Table 9.

In the two field curvature aberration diagrams in FIGS. 6A and 6B, the focal length variation of the three representative wavelengths within the entire field of view falls within ±0.14 mm. The distortion aberration diagram in FIG. 6C shows that the distortion aberration of the third embodiment is maintained within the range of ±1.8%. Based on this, it can be seen that the optical imaging lens 100 of the third embodiment can have good optical imaging quality under the condition that the total length of the lens has been shortened to about 2.21 mm.

FIG. 7 is a schematic diagram of a fingerprint recognition module according to the second embodiment of the present invention. 8A to 8C are various aberration diagrams of the fourth embodiment. Please refer to FIG. 3 first. A fourth embodiment of the fingerprint recognition module 200 of the present invention is roughly similar to the first embodiment, and the differences between the two are as follows: optical data, aspheric coefficients, and these lenses 1, The parameters of 2 and 3 are more or less different.

Other detailed optical data of the fourth embodiment are shown in Table 10 below. In the fourth embodiment, the aspheric coefficients of the object side surface 11 of the first lens 1 to the image side surface 52 of the fifth lens 5 in formula (1) are shown in Table 11:

The relationship among the important parameters in the optical imaging lens 100 of the fourth embodiment is shown in Table 12.

In the two field curvature aberration diagrams in FIGS. 8A and 8B, the focal length variation of the three representative wavelengths within the entire field of view falls within ±0.18 mm. The distortion aberration diagram of FIG. 8C shows that the distortion aberration of the fourth embodiment is maintained within the range of ±1.1%. It can be seen from this that the optical imaging lens 100 of the fourth embodiment can have good optical imaging quality under the condition that the total length of the lens has been shortened to about 2.26 mm.

FIG. 9 is a schematic diagram of a fingerprint recognition module according to the fifth embodiment of the present invention. 10A to 10C are various aberration diagrams of the fifth embodiment. Please refer to FIG. 9 first. A fifth embodiment of the fingerprint recognition module 200 of the present invention is roughly similar to the first embodiment, and the differences between the two are as follows: optical data, aspheric coefficients, and these lenses 1, The parameters of 2 and 3 are more or less different.

Other detailed optical data of the fifth embodiment are shown in Table 13 below. In the fifth embodiment, the aspheric coefficients of the object side surface 11 of the first lens 1 to the image side surface 52 of the fifth lens 5 in formula (1) are shown in Table 14:

The relationship among the important parameters in the optical imaging lens 100 of the fifth embodiment is shown in Table 15.

In the two field curvature aberration diagrams in FIGS. 10A and 10B, the focal length variation of the three representative wavelengths within the entire field of view falls within ±0.3 mm. The distortion aberration diagram in FIG. 10C shows that the distortion aberration of the fifth embodiment is maintained in the range of ±4.5%. Inside. Based on this, it can be seen that the optical imaging lens 100 of the fifth embodiment can have good optical imaging quality under the condition that the total length of the lens has been shortened to about 1.85 mm.

It should be noted that in the above-mentioned embodiment, the object side surface 11 of the first lens 1 is convex, that is, the area near the optical axis and the area near the circumference are both convex. In other embodiments, the area near the optical axis and the area near the circumference of the object side surface of the first lens can also be designed as the following three combinations of surface shapes: 1. Convex surface, concave surface; 2. Concave surface, convex surface; 3. Concave surface, concave surface The present invention is not limited to the surface shape of the object side surface of the first lens.

The optical imaging lens 100 of the embodiment of the present invention can achieve the following effects: In the optical imaging lens 100 of the embodiment of the present invention, the refractive powers of the first to third lenses 1 to 3 are sequentially designed to be negative, positive, and positive, with the following surface design, namely, the first lens The image side surface 12 of 1 is a concave surface, the object side 21 of the second lens 2 is a convex surface, and the image side 32 of the third lens 3 is a convex surface, thereby achieving good optical quality with a short overall lens length.

In the optical imaging lens 100 of the embodiment of the present invention, it satisfies the following conditional expression: 1.9≧|f/f1|≧0.4.

In the optical imaging lens 100 of the embodiment of the present invention, it satisfies the following conditional formula: 1.2≧f/f2≧0.1.

In the optical imaging lens 100 of the embodiment of the present invention, it satisfies the following conditional expression: 1.8≧f/f3≧0.2.

In view of the above, in detail, in the optical imaging lens 100 of the embodiment of the present invention, the above-mentioned lens refractive power combination and surface shape design are used to meet the above-mentioned focal length criteria. It can achieve the following effects: the refractive power of the first lens 1 is designed to be negative, in order to collect the large-angle imaging light into the rear lens, so as to achieve the purpose of wide field of view and reduce distortion. The refractive power of the second lens 2 is designed to be positive and its focal length is designed to be larger, which can focus and assist the first lens 1 to increase the angle of view and reduce distortion, so as to reduce the outer diameter of the first lens 1 to achieve the purpose of reducing the volume . In addition, the third lens 3 is designed to have a positive refractive power and a smaller focal length, which can be used to focus and correct the angle of the incident image plane.

In the optical imaging lens 100 of the embodiment of the present invention, by setting the position of the aperture 0 between the second and third lenses 2 and 3, the aperture can be enlarged and the image height can be increased to increase the imaging area.

In the optical imaging lens 100 of the embodiment of the present invention, by satisfying the following conditional formula: (R1+R2)/(R1-R2)<2, the image side surface 12 of the first lens 1 can be compared with the object side surface The deformation of 11 is more obvious, so that the light receiving angle of the first lens 1 is relatively large.

In the optical imaging lens 100 of the embodiment of the present invention, by satisfying the following conditional formula: (ET1-CT1)/(ET1+CT1)>0, the center thickness CT1 of the first lens 1 can be made thinner than the edge thickness ET1 , So that the light receiving angle of the first lens 1 is relatively large, and the distortion is relatively small.

In the optical imaging lens 100 of the embodiment of the present invention, the materials of the first lens 1 to the third lens 3 may satisfy the following conditional formula: 1.86≧(n1+n2+n3)/(n1*n2*n3)≧0.85, That is, the refractive indexes n1 to n3 of the first lens 1 to the third lens 3 can be selected from substances with a refractive index in the range of 1.4 to 1.7.

In the optical imaging lens 100 of the embodiment of the present invention, its field of view is 85 Between degrees and 140 degrees, it has a wide field of view, that is, the optical imaging lens 100 satisfies the following conditional formula: 2.74≧tan(HFOV)≧0.92.

In the optical imaging lens 100 of the embodiment of the present invention, it satisfies the following conditional formula: 5≧TTL/ImgH≧1. By satisfying this conditional formula, the ratio relationship between the total lens length and the image height can be restricted. If TTL/ImgH is less than 1, it means that the total length of the lens is too short relative to the image height, and the tolerance is sensitive and the manufacturability is poor. If the TTL/ImgH is greater than 5, it means that the total length of the lens relative to the image height is too long and the product will be too large.

0: aperture

1: the first lens

2: second lens

3: The third lens

211, 11, 21, 31, 221: Object side

212, 12, 22, 32, 222: like side

100: Optical imaging lens

200: Fingerprint recognition module

210: cover

220: filter

230: image sensor

C: The center of the first lens

CT1: Center thickness

E1, E2: Edge

ET1: Edge thickness

IP: imaging surface

I: Optical axis

IS: image side

OS: Object side

Claims (18)

An optical imaging lens includes a first lens, a second lens, and a third lens in sequence along an optical axis from the object side to the image side, wherein the first lens to the third lens each include a side facing the object side and The object side through which the imaging light passes and an image side toward the image side and through which the imaging light passes. The optical imaging lens has only the above three lenses with refractive power. Among them, the first lens has negative refractive power, and The image side surface of the first lens is concave; the second lens has positive refractive power, and the object side of the second lens is convex; and the third lens has positive refractive power, and the image of the third lens The side surface is convex, and the optical imaging lens satisfies the following conditional formula: 1.9≧|f/f1|>0.97, where f represents the effective focal length of the optical imaging lens, f1 represents the focal length of the first lens, and | f/f1| represents the absolute value of f/f1. The optical imaging lens described in item 1 of the scope of patent application further includes an aperture, which is arranged between the second lens and the third lens. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: (R1+R2)/(R1-R2)<2, where R1 is the object of the first lens The curvature radius of the side surface, and R2 is the curvature radius of the image side surface of the first lens. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: (ET1-CT1)/(ET1+CT1)>0, where ET1 is a thickness passing through the two edges of the first lens and parallel to the optical axis, and CT1 represents a thickness passing through the center of the first lens and on the optical axis. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 1.86≧(n1+n2+n3)/(n1*n2*n3)≧0.85, where n1 is the The refractive index of the first lens, n2 is the refractive index of the second lens, and n3 is the refractive index of the third lens. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 2.74≧tan(HFOV)≧0.92, where HFOV is the half angle of view of the optical imaging lens. The optical imaging lens described in item 1 of the scope of patent application, wherein the optical imaging lens further satisfies the following conditional formula: 5≧TTL/ImgH≧1, where TTL represents the object side of the first lens to an imaging surface At a distance on the optical axis, ImgH is the image height of the optical imaging lens. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 1.2≧f/f2≧0.1, where f represents the effective focal length of the optical imaging lens, and f2 represents The focal length of the second lens. For the optical imaging lens described in item 1 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 1.8≧f/f3≧0.2, where f represents the effective focal length of the optical imaging lens, and f3 represents The focal length of the third lens. A fingerprint recognition module includes: a cover; An optical imaging lens is arranged downstream of the optical path of the cover plate. The optical imaging lens includes a first lens, a second lens, and a third lens in sequence from the object side to the image side along an optical axis. The lens to the third lens each include an object side surface that faces the object side and allows imaging light to pass through, and an image side surface that faces the image side and allows imaging light to pass, and the optical imaging lens has only the above three lenses. , Wherein the first lens has a negative refractive power, and the image side surface of the first lens is a concave surface; the second lens has a positive refractive power, and the object side surface of the second lens is a convex surface; and the third lens , Has a positive refractive power, and the image side surface of the third lens is convex, wherein the optical imaging lens satisfies the following conditional formula: 1.9≧|f/f1|>0.97, where f represents the effective focal length of the optical imaging lens , F1 represents the focal length of the first lens, and |f/f1| represents the absolute value of f/f1; and an image sensor is arranged downstream of the optical path of the optical imaging lens. According to the fingerprint recognition module of claim 10, the optical imaging lens further includes an aperture arranged between the second lens and the third lens. As for the fingerprint recognition module described in item 10 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: (R1+R2)/(R1-R2)<2, where R1 is the first lens The curvature radius of the object side surface, and R2 is the curvature radius of the image side surface of the first lens. For example, the fingerprint recognition module described in item 10 of the scope of patent application, wherein the optical imaging lens further satisfies the following conditional formula: (ET1-CT1)/(ET1+CT1)>0, where ET1 is the lens passing through the first lens Two edges are a thickness parallel to the optical axis, and CT1 represents a thickness passing through the center of the first lens and on the optical axis. For example, the fingerprint recognition module described in item 10 of the scope of patent application, wherein the optical imaging lens satisfies the following conditional formula: 1.86≧(n1+n2+n3)/(n1*n2*n3)≧0.85, where n1 is The refractive index of the first lens, n2 is the refractive index of the second lens, and n3 is the refractive index of the third lens. For the fingerprint recognition module described in item 10 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 2.74≧tan(HFOV)≧0.92, where HFOV is the half angle of view of the optical imaging lens. For the fingerprint recognition module described in item 10 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 5≧TTL/ImgH≧1, where TTL represents the object side of the first lens to an imaging A distance of the surface on the optical axis, ImgH is the image height of the optical imaging lens. For the fingerprint recognition module described in item 10 of the scope of patent application, the optical imaging lens further satisfies the following conditional formula: 1.2≧f/f2≧0.1, where f represents the effective focal length of the optical imaging lens, and f2 represents Is the focal length of the second lens. For example, the fingerprint recognition module described in item 10 of the scope of patent application, wherein the optical imaging lens satisfies the following conditional formula: 1.8≧f/f3≧0.2, where f represents the effective focal length of the optical imaging lens, and f3 represents Is the focal length of the third lens.

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