TW201641986A - Optical imaging lens and mobile device - Google Patents

Abstract

An optical imaging lens includes an aperture stop and first, second, and third lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The image-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power, and the image-side surface of the second lens element has a convex portion in a vicinity of the optical axis. The optical imaging lens satisfies: 2*[nu]1 ≤ [nu]2+[nu]3, where [nu]1, [nu]2, and [nu]3 are coefficients of dispersion of the first, second, and third lens elements, respectively. A mobile device is also provided.

Description

Optical imaging lens and portable electronic device

The present invention relates to an optical lens and an electronic device, and more particularly to an optical imaging lens and a portable electronic device.

In recent years, the popularity of portable electronic products such as mobile phones and digital cameras has led to the development of image module related technologies. The image module mainly includes an optical imaging lens, a module holder unit and a sensor. The components and the thin and light trend of mobile phones and digital cameras have also made the demand for miniaturization of image modules more and more high. With the technological advancement and downsizing of a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), an optical imaging lens mounted in an image module also needs to be correspondingly Shorten the length. However, in order to avoid photographic effects and quality degradation, good optical performance must be compromised when shortening the length of the optical imaging lens. The most important feature of an optical imaging lens is nothing more than image quality and volume.

The specifications of portable electronic products (such as mobile phones, cameras, tablets, personal digital assistants, car photography devices, etc.) are changing with each passing day. The key components of the optical lens group, the optical lens group, are also more diverse, and the application is not limited to shooting images and video. In addition, environmental monitoring, driving record photography, etc., and with the advancement of image sensing technology, consumers' requirements for image quality and so on have also increased. Therefore, the design of the optical lens group not only requires good imaging quality, but also a small lens space. For the environment where the driving and the light are insufficient, the improvement of the viewing angle and the aperture size is also a subject to be considered.

However, the optical imaging lens design is not simply to reduce the imaging quality of the lens to produce an optical imaging lens that combines imaging quality and miniaturization. The design process involves material properties, and must also consider the assembly yield and other production lines. The actual problem.

The manufacturing technology of miniaturized lens is obviously more difficult than traditional lens. Therefore, how to make optical imaging lens that meets the demand of consumer electronic products and continuously improve its image quality has long been the pursuit of the industry, government and academic circles in this field. .

In addition, in the case of the three-piece lens structure, the conventional optical imaging lens has a large distance from the object side surface of the first lens to the imaging surface on the optical axis, which is disadvantageous for the thinning of the mobile phone and the digital camera.

The present invention provides an optical imaging lens that retains good optical performance while shortening the length of the lens system.

An embodiment of the present invention provides an optical imaging lens that sequentially includes an aperture, a first lens, a second lens, and a third lens along an optical axis from the object side to the image side, and the first lens to the third lens The lenses each include an object side that faces the object side and allows imaging light to pass through and an image side that faces the image side and allows imaging light to pass. The image side of the first lens has a convex portion located in the vicinity of the circumference. The second lens has a negative refractive power, and the image side of the second lens has a convex portion located in the vicinity of the optical axis. The optical imaging lens has only three lenses with refractive power, and the optical imaging lens conforms to: 2×ν1≦ν2+ν3, where ν1 is the dispersion coefficient of the first lens, ν2 is the dispersion coefficient of the second lens, and ν3 is the first The dispersion coefficient of the three lenses.

An embodiment of the invention provides a portable electronic device including a casing and an image module. The image module is mounted in the casing and includes the optical imaging lens, a lens barrel, a module rear seat unit and an image sensor. The lens barrel is provided for the optical imaging lens, the module rear seat unit is provided for the lens barrel, and the image sensor is disposed on the image side of the optical imaging lens.

Based on the above, the optical imaging lens and the portable electronic device of the embodiments of the present invention have the beneficial effects of designing and arranging the concave and convex shapes of the object side or the image side of the lens to shorten the length of the system. Underneath, there are still optical properties that can effectively overcome aberrations and provide good image quality.

The above described features and advantages of the invention will be apparent from the following description.

As used in this specification, "a lens having a positive refractive power (or a negative refractive power)" means that the refractive index of the lens on the optical axis calculated by Gaussian optical theory is positive (or negative). The image side and the object side are defined as a range through which the imaging light passes, wherein the imaging light includes a chief ray Lc and a marginal ray Lm, as shown in FIG. 1, I is an optical axis and the lens is The optical axis I is symmetric with respect to each other in a radial direction. The region of the light passing through the optical axis is the region A near the optical axis, the region through which the edge light passes is the region C near the circumference, and the lens further includes an extension E ( That is, the radially outward region of the region C near the circumference, for the lens to be assembled in an optical imaging lens, the ideal imaging light does not pass through the extension portion E, but the structure and shape of the extension portion E are not In this regard, the following embodiments omits portions of the extensions for simplicity of the drawing. In more detail, the method of determining the area near the surface or the optical axis, the area near the circumference, or the range of the plurality of areas is as follows:

1. Please refer to FIG. 1, which is a cross-sectional view of a lens in the radial direction. In the cross-sectional view, when determining the range of the region, a center point is defined as an intersection with the optical axis on the surface of the lens, and a transition point is a point on the surface of the lens, and the line passing through the point It is perpendicular to the optical axis. If there are a plurality of transition points outward in the radial direction, the first transition point and the second transition point are sequentially, and the transition point farthest from the optical axis in the effective half-effect path is the Nth transition point. The range between the center point and the first transition point is a region near the optical axis, and the radially outward region of the Nth transition point is a region near the circumference, and different regions can be distinguished according to the respective transition points. Further, the effective radius is the vertical distance at which the edge ray Lm intersects the lens surface to the optical axis I.

2. As shown in Fig. 2, the shape of the region is determined by the intersection of the light (or the ray extending line) passing through the region and the optical axis on the image side or the object side (the light focus determination method). For example, when the light passes through the area, the light will be focused toward the image side, and the focus of the optical axis will be on the image side, such as the R point in FIG. 2, and the area is a convex surface. Conversely, if the light passes through the certain area, the light will diverge, and the extension line and the focus of the optical axis are on the object side. For example, at point M in Fig. 2, the area is a concave surface, so the center point is between the first transition point. The convex portion, the radially outward portion of the first switching point is a concave surface; as can be seen from FIG. 2, the switching point is a boundary point of the convex surface of the convex surface, so that the inner side of the region adjacent to the radial direction can be defined. The area has a different face shape with the transition point as a boundary. In addition, if the shape of the region near the optical axis is judged according to the judgment of the person in the field, the R value (referring to the radius of curvature of the paraxial axis, generally refers to the R on the lens data in the optical software). Value) Positive and negative judgment bump. In the aspect of the object, when the R value is positive, it is determined as a convex surface, and when the R value is negative, it is determined as a concave surface; on the image side, when the R value is positive, it is determined as a concave surface, when R is When the value is negative, it is determined as a convex surface, and the unevenness determined by this method is the same as the light focus determination method.

3. If there is no transition point on the surface of the lens, the area near the optical axis is defined as 0~50% of the effective radius, and the area near the circumference is defined as 50~100% of the effective radius.

The lens image side surface of the first example of Fig. 3 has only the first transition point on the effective radius, the first region is the vicinity of the optical axis, and the second region is the region near the circumference. The R value of the side of the lens image is positive, so that the area near the optical axis has a concave surface; the surface shape of the vicinity of the circumference is different from the inner area of the area immediately adjacent to the radial direction. That is, the area near the circumference and the area near the optical axis are different; the area near the circumference has a convex surface.

The lens object side surface of the example 2 of FIG. 4 has first and second switching points on the effective radius, and the first region is a region near the optical axis, and the third region is a region near the circumference. The R value of the side surface of the lens object is positive, so that the area near the optical axis is determined to be a convex surface; the area between the first switching point and the second switching point (second area) has a concave surface, and the area near the circumference (third area) Has a convex face.

The lens side surface of the third example of Fig. 5 has no transition point on the effective radius. At this time, the effective radius 0%~50% is the vicinity of the optical axis, and 50%~100% is the vicinity of the circumference. Since the R value in the vicinity of the optical axis is positive, the side surface of the object has a convex portion in the vicinity of the optical axis; and there is no transition point between the vicinity of the circumference and the vicinity of the optical axis, so that the vicinity of the circumference has a convex portion.

Fig. 6 is a schematic view of an optical imaging lens according to a first embodiment of the present invention, and Figs. 7A to 7D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the first embodiment. Referring to FIG. 6 , the optical imaging lens 10 of the first embodiment of the present invention sequentially includes an aperture 2, a first lens 3 and a second lens along an optical axis I of the imaging lens 10 from the object side to the image side. 4. A third lens 5 and a filter 9. When the light emitted by a subject enters the optical imaging lens 10 and passes through the aperture 2, the first lens 3, the second lens 4, the third lens 5, and the filter 9, an image plane 100 (image) Plane) forms an image. The filter 9 is, for example, an IR cut filter for preventing infrared rays from being transmitted to the image plane 100 in a part of the light band to affect the image quality. It is added that the object side is the side facing the object to be photographed, and the image side is the side facing the image plane 100.

Each of the first lens 3, the second lens 4, the third lens 5, and the filter 9 has an object side 31, 41, 51, 91 and an image side that are oriented toward the object side, and the imaging light is imaged. Through the image side faces 32, 42, 52, 92.

In addition, in order to meet the demand for light weight of the product, the first lens 3 to the third lens 5 are both made of a refractive power and are made of a plastic material, but the materials of the first lens 3 to the third lens 5 are not For the limit.

The first lens 3 has a positive refractive power. The object side surface 31 of the first lens 3 is a convex surface, and has a convex portion 311 located in the vicinity of the optical axis I and a convex portion 312 located in the vicinity of the circumference. The image side surface 32 of the first lens 3 has a concave surface portion 321 located in the vicinity of the optical axis I and a convex surface portion 322 located in the vicinity of the circumference. In this embodiment, both the object side surface 31 and the image side surface 32 of the first lens 3 are aspherical.

The second lens 4 has a negative refractive power. The object side surface 41 of the second lens 4 is a concave surface, and has a concave surface portion 411 located in the vicinity of the optical axis I and a concave surface portion 412 located in the vicinity of the circumference. The image side surface 42 of the second lens 4 has a convex portion 421 in the vicinity of the optical axis I and a concave portion 422 located in the vicinity of the circumference. In this embodiment, both the object side surface 41 and the image side surface 42 of the second lens 4 are aspherical.

The third lens 5 has a negative refractive power. The object side surface 51 of the third lens 5 has a convex portion 511 located in the vicinity of the optical axis I and a concave portion 512 located in the vicinity of the circumference. The image side surface 52 of the third lens 5 has a concave surface portion 521 located in the vicinity of the optical axis I and a convex surface portion 522 located in the vicinity of the circumference. In this embodiment, the object side surface 51 and the image side surface 52 of the third lens 5 are all aspherical.

In the first embodiment, only the above lens has a refractive power, and only three lenses have a refractive index.

The other detailed optical data of the first embodiment is as shown in FIG. 8, and the overall system has an effective focal length (EFL) of 2.857 mm and a half field of view (HFOV) of 28.250 Å. The value (f-number, Fno) is 2.2, the system length is 3.436 mm, and the image height is 1.542 mm. The system length refers to the distance from the object side 31 of the first lens 3 to the imaging plane 100 on the optical axis I.

In addition, in the present embodiment, the six sides of the object side faces 31, 41, 51 and the image side faces 32, 42, 52 of the first lens 3, the second lens 4, and the third lens 5 are aspherical, and these aspherical surfaces It is defined by the following formula: -----------(1) where: Y: the distance between the point on the aspheric curve and the optical axis I; Z: the depth of the aspheric surface (the point on the aspheric surface from which the optical axis I is Y, And the tangent plane tangent to the vertex on the aspherical optical axis I, the vertical distance between them); R: the radius of curvature at the near-optical axis I of the lens surface; K: the conic constant; : The i-th order aspheric coefficient.

The aspherical coefficients of the object side surface 31 of the first lens 3 to the image side surface 52 of the third lens 5 in the formula (1) are as shown in FIG. Here, the column number 31 in FIG. 9 indicates that it is the aspherical coefficient of the object side surface 31 of the first lens 3, and the other fields are deduced by analogy.

In addition, the relationship among the important parameters in the optical imaging lens 10 of the first embodiment is as shown in FIG. Wherein T1 is the thickness of the first lens 3 on the optical axis I; T2 is the thickness of the second lens 4 on the optical axis I; T3 is the thickness of the third lens 5 on the optical axis I; TF is the filter 9 The thickness on the optical axis I; G1 is the distance from the image side surface 32 of the first lens 3 to the object side surface 41 of the second lens 4 on the optical axis I; G2 is the image side surface 42 to the third lens 5 of the second lens 4 The distance of the object side surface 51 on the optical axis I; G3F is the distance from the image side surface 52 of the third lens 5 to the object side surface 91 of the filter 9 on the optical axis I; GFP is the image side surface 92 of the filter 9 to The distance of the imaging surface 100 on the optical axis I; Gaa is the sum of the two air gaps of the first lens 3 to the third lens 5 on the optical axis I, that is, the sum of G1 and G2; ALT is the first lens 3, The sum of the thicknesses of the two lenses 4 and the third lens 5 on the optical axis I, that is, the sum of T1, T2 and T3; TTL is the distance from the object side surface 31 of the first lens 3 to the imaging plane 100 on the optical axis I; TL The distance from the object side surface 31 of the first lens 3 to the image side surface 52 of the third lens 5 on the optical axis I; BFL is the distance from the image side surface 52 of the third lens 5 to the imaging plane 100 on the optical axis I; EFL is Optical imaging lens 10 system Pitch; 2 and TA is adjacent to a lens aperture-side surface of the object (in the present embodiment, for example, a first object side lens 31 3) the distance on the optical axis I. In addition, it is further defined that: GFP is the air gap between the filter 9 and the imaging surface 100 on the optical axis I; f1 is the focal length of the first lens 3; f2 is the focal length of the second lens 4; f3 is the third lens 5 The focal length; n1 is the refractive index of the first lens 3; n2 is the refractive index of the second lens 4; n3 is the refractive index of the third lens 5; ν1 is the Abbe number of the first lens 3, Abbe The coefficient may also be referred to as a dispersion coefficient; ν2 is the Abbe's coefficient of the second lens 4; and ν3 is the Abbe's coefficient of the third lens 5.

Referring again to FIG. 7A to FIG. 7D, the diagram of FIG. 7A illustrates the longitudinal spherical aberration of the first embodiment, and the diagrams of FIGS. 7B and 7C respectively illustrate the first embodiment on the imaging plane 100. The astigmatism aberration in the sagittal direction and the astigmatic aberration in the tangential direction, and the pattern in Fig. 7D illustrates the distortion aberration on the imaging plane 100 of the first embodiment (distortion aberration) ). In the vertical spherical aberration diagram of the first embodiment, in Fig. 7A, the curves formed by each of the wavelengths are very close to each other and are close to the middle, indicating that each of the off-axis rays of different wavelengths is concentrated near the imaging point, by each The deflection amplitude of the curve of the wavelength can be seen that the deviation of the imaging point of the off-axis ray of different heights is controlled within the range of ±0.025 mm, so this embodiment does significantly improve the spherical aberration of the same wavelength, and in addition, the three representative wavelengths are mutually The distances are also quite close, and the imaging positions representing the different wavelengths of light are already quite concentrated, so that the chromatic aberration is also significantly improved.

In the two astigmatic aberration diagrams of FIG. 7B and FIG. 7C, the focal length variation of the three representative wavelengths in the entire field of view falls within ±0.027 mm, indicating that the optical system of the first embodiment can effectively eliminate the image. difference. The distortion aberration diagram of FIG. 7D shows that the distortion aberration of the first embodiment is maintained within the range of ±2.5%, indicating that the distortion aberration of the first embodiment has met the imaging quality requirements of the optical system. It is to be noted that the first embodiment can provide better image quality under the condition that the length of the system has been shortened to about 3.436 mm compared with the prior art optical lens, so that the first embodiment can maintain good optical performance. , shortening the length of the lens and expanding the shooting angle to achieve a thinner product design with increased viewing angle.

10 is a schematic view of an optical imaging lens according to a second embodiment of the present invention, and FIGS. 11A to 11D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the second embodiment. Referring first to FIG. 10, a second embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment except that each optical data, aspheric coefficient, and parameters between the lenses 3, 4, 5 are more than or Less different. It is to be noted that, in order to clearly display the drawings, the same reference numerals of the concave and convex portions as those of the first embodiment are omitted in FIG.

The detailed optical data of the optical imaging lens 10 is as shown in FIG. 12, and the overall system focal length of the second embodiment is 2.902 mm, the half angle of view (HFOV) is 27.887 ∘, the aperture value (Fno) is 2.2, and the system length is 3.408 mm. The image height is 1.542 mm.

As shown in Fig. 13, the aspherical coefficients in the formula (1) are the object side faces 31 of the first lens 3 of the second embodiment to the image side faces 52 of the third lens 5.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the second embodiment is as shown in FIG.

The longitudinal spherical aberration of the second embodiment is shown in Fig. 11A, and the imaging point deviation of the off-axis rays of different heights is controlled within the range of ±0.027 mm. In the two astigmatic aberration diagrams of Figs. 11B and 11C, the amount of change in the focal length of the three representative wavelengths over the entire field of view falls within ±0.04 mm. On the other hand, the distortion aberration diagram of Fig. 11D shows that the distortion aberration of the second embodiment is maintained within the range of ± 2.5%. According to this description, the second embodiment can provide good image quality even when the system length has been shortened to about 3.408 mm as compared with the first embodiment.

As can be seen from the above description, the second embodiment has an advantage over the first embodiment in that the system length of the second embodiment is shorter than that of the first embodiment, and the second embodiment is easier than the first embodiment. Manufacturing, so the yield is higher.

Figure 14 is a schematic view of an optical imaging lens according to a third embodiment of the present invention, and Figures 15A to 15D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the third embodiment. Referring first to Figure 14, a third embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment except that each optical data, aspherical coefficient, and parameters between the lenses 3, 4, 5 are more than or It is somewhat different, and the third lens 5 has a positive refractive power. It is to be noted here that, in order to clearly display the drawings, the same reference numerals of the concave and convex portions as those of the first embodiment are omitted in FIG.

The detailed optical data of the optical imaging lens 10 is as shown in Fig. 16, and the overall system focal length of the third embodiment is 2.983 mm, the half angle of view (HFOV) is 26.706 ∘, the aperture value (Fno) is 2.5, and the system length is 3.699 mm. The image height is 1.542 mm.

As shown in Fig. 17, the aspherical coefficients in the formula (1) are the object side faces 31 of the first lens 3 of the third embodiment to the image side faces 52 of the third lens 5.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the third embodiment is as shown in FIG.

The longitudinal spherical aberration of the third embodiment is shown in Fig. 15A, and the imaging point deviation of the off-axis rays of different heights is controlled within the range of ±0.025 mm. In the two astigmatic aberration diagrams of Figs. 15B and 15C, the amount of change in the focal length of the three representative wavelengths over the entire field of view falls within ±0.04 mm. On the other hand, the distortion aberration diagram of Fig. 15D shows that the distortion aberration of the third embodiment is maintained within the range of ± 2.5%. Accordingly, the third embodiment can provide better image quality even when the length of the system has been shortened to about 3.699 mm compared to the prior art optical lens.

As apparent from the above description, the third embodiment is advantageous over the first embodiment in that the third embodiment is easier to manufacture than the first embodiment, and thus the yield is high.

18 is a schematic view of an optical imaging lens according to a fourth embodiment of the present invention, and FIGS. 19A to 19D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fourth embodiment. Referring first to FIG. 18, a fourth embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first embodiment except that each optical data, aspherical coefficient, and parameters between the lenses 3, 4, and 5 are more than or Less different. It is to be noted that, in order to clearly display the drawings, the same reference numerals of the concave and convex portions as those of the first embodiment are omitted in FIG.

The detailed optical data of the optical imaging lens 10 is as shown in FIG. 20, and the overall system focal length of the fourth embodiment is 2.889 mm, the half angle of view (HFOV) is 27.759 ∘, the aperture value (Fno) is 2.6, and the system length is 3.551 mm. The image height is 1.574 mm.

As shown in Fig. 21, the aspherical coefficients in the formula (1) are the object side faces 31 of the first lens 3 of the fourth embodiment to the image side faces 52 of the third lens 5.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the fourth embodiment is as shown in FIG.

The longitudinal spherical aberration of the fourth embodiment is shown in Fig. 19A, and the imaging point deviation of the off-axis rays of different heights is controlled within the range of ±0.025 mm. In the two astigmatic aberration diagrams of Figs. 19B and 19C, the amount of change in the focal length of the three representative wavelengths over the entire field of view falls within ±0.06 mm. On the other hand, the distortion aberration diagram of Fig. 19D shows that the distortion aberration of the fourth embodiment is maintained within the range of ± 2%. Accordingly, the fourth embodiment can provide better image quality even when the length of the system has been shortened to about 3.564 mm as compared with the prior art optical lens.

As can be seen from the above description, the fourth embodiment has an advantage over the first embodiment in that the astigmatic aberration of the fourth embodiment is smaller than that of the first embodiment, and the distortion image of the fourth embodiment is different. The difference is smaller than the distortion aberration of the first embodiment, and the fourth embodiment is easier to manufacture than the first embodiment, and thus the yield is high.

Referring again to FIG. 22, which is a table diagram of the optical parameters of the above four embodiments, when the relationship between the optical parameters in the optical imaging lens 10 of the embodiment of the present invention meets at least the following conditional expressions For a time, it can help designers to design optical imaging lenses with good optical performance, effective overall shortening, and technical feasibility:

1. In order to shorten the length of the lens system, the embodiment of the present invention appropriately shortens the lens thickness and the air gap between the lenses, but considering the difficulty of the lens assembly process and the necessity of taking into consideration the image quality, the lens thickness and the inter-lens The air gaps need to be mutually tuned to each other, so the optical imaging system can achieve a better configuration under the following numerical conditions: (G1+T1)/BFL≦1.3, preferably 0.500≦(G1+T1)/ BFL≦1.300; (T2+G1)/BFL≦1.1, preferably 0.500≦(T2+G1)/BFL≦1.100; BFL/T1≦2.6, preferably 0.700≦BFL/T1≦2.600; (T2+G2 /T2≦1.7, preferably 1.100≦(T2+G2)/T2≦1.700; (T2+G1)/G2≦3.7, preferably 2.100≦(T2+G1)/G2≦3.700; (T1+G2 ) / T1 ≦ 1.5, preferably 1.100 ≦ (T1 + G2) / T1 ≦ 1.500; (G1 + T1) / G2 ≦ 4.1, preferably 2.300 ≦ (G1 + T1) / G2 ≦ 4.100; (T2+G2 )/T1 1.4, preferably 0.900 ≦(T2+G2)/T1≦1.400; ALT/G2≦7.5, preferably 4.000≦ALT/G2≦7.500; (T2+T3)/G2≦4.7, preferably 2.600≦( T2+T3)/G2≦4.700; (T1+T3)/T1≦1.9, preferably 1.700≦(T1+T3)/T1≦1.900; (T1+G2)/G2≦3.7, preferably 2.300≦( T1+G2)/G2≦3.700.

2. Shortening the system focal length of the imaging lens 10 as a whole contributes to the expansion of the viewing angle, so that the system focal length of the imaging lens 10 as a whole is designed to be small, and if the following conditional expression is satisfied, in the process of thinning the thickness of the optical system, there is also Help to expand the field of view: EFL/T2≦6.3, preferably 2.900≦EFL/T2≦6.300; EFL/(T2+T1)≦2.8, preferably 1.200≦EFL/(T2+T1)≦2.800; EFL/ T1≦5.2, preferably 2.300≦EFL/T1≦5.200; EFL/(T2+T3)≦2.7, preferably 1.300≦EFL/(T2+T3)≦2.700.

3. Under the following conditions, the ratio of the focal length of the lens to the length of the lens can be maintained at an appropriate value. Avoiding too small a parameter is not conducive to imaging a distant object to the lens, or avoiding excessive parameters and making the lens length too long: 1.1 ≦EFL/ALT, preferably 1.100 ≦ EFL/ALT ≦ 2.000; 0.9 ≦ EFL/TL, preferably 0.900 ≦ EFL/TL ≦ 1.400.

4. Under the following conditions, the sharpness of the local imaging of the object can be effectively enhanced, and the aberration of the local imaging of the object can be effectively corrected: 2×ν1≦ν2+ν3.

5. The optical imaging lens of the embodiment of the present invention satisfies any of the following conditional expressions, indicating that when the denominator is constant, the length of the molecule can be relatively shortened, and the effect of reducing the volume of the lens can be achieved: (G1+T1)/BFL≦ 1.3; (T2+G1)/BFL≦1.1; BFL/T1≦2.6; (T2+G2)/T2≦1.7; (T2+G1)/G2≦3.7; (T1+G2)/T1≦1.5; (G1 +T1)/G2≦4.1; (T2+G2)/T1≦1.4; ALT/G2≦7.5; (T2+T3)/G2≦4.7; (T1+T3)/T1≦1.9; (T1+G2)/ G2≦3.7; EFL/T2≦6.3; EFL/(T2+T1)≦2.8; EFL/T1≦5.2; EFL/(T2+T3)≦2.7. If you can further meet any of the following conditions, you can also produce better image quality: 0.500 ≦ (G1 + T1) / BFL ≦ 1.300; 0.500 ≦ (T2+G1) / BFL ≦ 1.100; 0.700 ≦ BFL / T1 ≦ 2.600; 1.100≦(T2+G2)/T2≦1.700; 2.100≦(T2+G1)/G2≦3.700; 1.100≦(T1+G2)/T1≦1.500; 2.300≦(G1+T1)/G2≦4.100; 0.900≦(T2+G2)/T1≦1.400;4.000≦ALT/G2≦7.500; 2.600≦(T2+T3)/G2≦4.700; 1.700≦(T1+T3)/T1≦1.900;2.300≦(T1+G2 ) / G2 ≦ 3.700.

6. When the optical imaging lens of the present invention satisfies any of the following conditional expressions, it indicates that it has a better configuration and can produce good imaging quality while maintaining proper yield: 1.1 ≦ EFL / ALT; 0.9 ≦ EFL / TL . If any of the following conditions can be further satisfied, a more appropriate volume can be further maintained: 1.100 ≦ EFL / ALT ≦ 2.000; 0.900 ≦ EFL / TL ≦ 1.400.

However, in view of the unpredictability of the optical system design, under the framework of the embodiment of the present invention, the above conditional condition can better shorten the lens length, increase the available aperture, increase the angle of view, and image quality. Improvements, or assembly yield improvements, improve the shortcomings of prior art.

In summary, the optical imaging lens 10 of the embodiment of the present invention can achieve the following effects and advantages:

1. The longitudinal spherical aberration, astigmatic aberration, and distortion of the embodiments of the present invention all conform to the usage specifications. In addition, 860 nm, 850 nm, and 840 nm are representative of the off-axis rays at different heights near the imaging point. The angle of deflection of each curve shows the imaging points of off-axis rays of different heights. The deviations are controlled and have good spherical aberration, aberration, and distortion suppression capability. Further referring to the imaging quality data, the distances of the three representative wavelengths of 860 nm, 850 nm, and 840 nm are also relatively close to each other, showing that the embodiment of the present invention has excellent concentration of different wavelengths of light in various states and has excellent performance. Since the dispersion suppressing ability is obtained, it is understood from the above that the embodiment of the present invention has good optical performance. The optical imaging lens 10 of the embodiment of the present invention can be used as a night vision lens or a pupil recognition lens for imaging infrared light, and it is known from the above description that it has a good imaging effect on infrared light.

Second, the negative refractive power of the third lens 5 can be used to eliminate aberrations.

3. The concave side surface 321 of the image side surface 32 of the first lens 3 in the vicinity of the optical axis I and the convex surface portion 322 of the vicinity of the circumference area can help collect the imaging light; and the vicinity of the optical axis I of the image side surface 42 of the second lens 4 is The convex portion 421, the vicinity of the circumference of the image side surface 42 is the concave surface portion 422, and the region near the circumference of the object side surface 51 of the third lens 5 is the concave surface portion 512, so that the effect of correcting aberration can be achieved by matching each other, wherein the second lens 4 The vicinity of the circumference of the image side surface 42 is the concave surface portion 422, which can effectively correct the aberration of the partial imaging of the object.

Fourth, through the combination of the above design can effectively shorten the length of the lens while ensuring the image quality, and enhance the sharpness of the local imaging of the object.

Referring to FIG. 35, in a first embodiment of the portable electronic device 1 of the optical imaging lens 10, the portable electronic device 1 includes a casing 11 and an image module 12 mounted in the casing 11. . The portable electronic device 1 is only described by using a mobile phone as an example, but the type of the portable electronic device 1 is not limited thereto.

The image module 12 includes an optical imaging lens 10 as described above, a lens barrel 21 for the optical imaging lens 10, a module rear seat unit 120 for the lens barrel 21, and a The image sensor 130 on the image side of the optical imaging lens 10. The imaging surface 100 is formed on the image sensor 130.

The module rear seat unit 120 has a lens rear seat 121 and an image sensor rear seat 122 disposed between the lens rear seat 121 and the image sensor 130. The lens barrel 21 is disposed coaxially with the lens rear seat 121 along an axis II, and the lens barrel 21 is disposed inside the lens rear seat 121.

Referring to FIG. 36, a second embodiment of the portable electronic device 1 of the optical imaging lens 10 is applied. The main difference between the second embodiment and the portable electronic device 1 of the first embodiment is that the rear seat of the module Unit 120 is a voice coil motor (VCM) version. The lens rear seat 121 has a first seat body 123 disposed on the outer side of the lens barrel 21 and disposed along an axis III, a second seat body 124 disposed along the axis III and surrounding the outer side of the first seat body 123, and a setting. A coil 125 between the outside of the first body 123 and the inside of the second body 124, and a magnetic member 126 disposed between the outside of the coil 125 and the inside of the second body 124.

The first seat body 123 of the lens rear seat 121 is movable along the axis III with the lens barrel 21 and the optical imaging lens 10 disposed inside the lens barrel 21. The image sensor rear seat 122 is in contact with the second body 124. The filter 9 is disposed in the image sensor rear seat 122. Other components of the second embodiment of the portable electronic device 1 are similar to those of the portable electronic device 1 of the first embodiment, and are not described herein again.

By mounting the optical imaging lens 10, since the system length of the optical imaging lens 10 can be effectively shortened, the thickness of the first embodiment and the second embodiment of the portable electronic device 1 can be relatively reduced to make a thinner profile. The product, and still capable of providing good optical performance and image quality, thereby enabling the portable electronic device 1 of the embodiment of the present invention to meet the economic benefits of reducing the amount of material used in the casing, and to meet the light and thin product design. Trends and consumer demand.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

1‧‧‧Portable electronic device
10‧‧‧Optical imaging lens
100‧‧‧ imaging surface
11‧‧‧Shell
12‧‧‧Image Module
120‧‧‧Modular rear seat unit
121‧‧‧Lens rear seat
122‧‧‧Image sensor rear seat
123‧‧‧First body
124‧‧‧Second body
125‧‧‧ coil
126‧‧‧ Magnetic components
130‧‧‧Image Sensor
2‧‧‧ aperture
21‧‧‧Mirror tube
3‧‧‧first lens
31, 41, 51, 91‧‧‧ ‧ side
311, 312, 322, 421, 511, 522‧‧ ‧ convex face
321, 411, 412, 422, 512, 521‧‧ ‧ concave face
32, 42, 52, 92‧‧‧
4‧‧‧second lens
5‧‧‧ third lens
9‧‧‧Filter
A‧‧‧Axis near the optical axis
C‧‧‧near the circle
E‧‧‧Extension
I‧‧‧Axis II, III‧‧‧ axis
Lc‧‧‧ chief ray
Lm‧‧‧ edge light
M, R‧‧ points

Figure 1 is a schematic view showing the surface structure of a lens. Fig. 2 is a schematic view showing the surface relief structure of a lens and the ray focus. Fig. 3 is a schematic view showing the surface structure of a lens of an example one. Fig. 4 is a schematic view showing the surface structure of a lens of an example two. Fig. 5 is a schematic view showing the surface structure of a lens of an example three. Fig. 6 is a schematic view of an optical imaging lens according to a first embodiment of the present invention. 7A to 7D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the first embodiment. Fig. 8 shows detailed optical data of the optical imaging lens of the first embodiment of the present invention. Fig. 9 shows aspherical parameters of the optical imaging lens of the first embodiment of the present invention. Figure 10 is a schematic view of an optical imaging lens of a second embodiment of the present invention. 11A to 11D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the second embodiment. Fig. 12 shows detailed optical data of the optical imaging lens of the second embodiment of the present invention. Figure 13 shows aspherical parameters of the optical imaging lens of the second embodiment of the present invention. Figure 14 is a schematic view of an optical imaging lens of a third embodiment of the present invention. 15A to 15D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the third embodiment. Fig. 16 shows detailed optical data of the optical imaging lens of the third embodiment of the present invention. Fig. 17 shows aspherical parameters of the optical imaging lens of the third embodiment of the present invention. Figure 18 is a schematic view of an optical imaging lens of a fourth embodiment of the present invention. 19A to 19D are longitudinal spherical aberration and various aberration diagrams of the optical imaging lens of the fourth embodiment. Fig. 20 shows detailed optical data of the optical imaging lens of the fourth embodiment of the present invention. Figure 21 shows aspherical parameters of the optical imaging lens of the fourth embodiment of the present invention. Fig. 22 shows numerical values of important parameters of the optical imaging lens of the first to fourth embodiments of the present invention and their relational expressions. Figure 23 is a cross-sectional view showing a first embodiment of the portable electronic device of the present invention. Figure 24 is a cross-sectional view showing a second embodiment of the portable electronic device of the present invention.

10‧‧‧Optical imaging lens

100‧‧‧ imaging surface

2‧‧‧ aperture

3‧‧‧first lens

31, 41, 51, 91‧‧‧ ‧ side

311, 312, 322, 421, 511, 522‧‧ ‧ convex face

321, 411, 412, 422, 512, 521‧‧ ‧ concave face

32, 42, 52, 92‧‧‧

4‧‧‧second lens

5‧‧‧ third lens

9‧‧‧Filter

I‧‧‧ optical axis

Claims (20)

An optical imaging lens includes an aperture, a first lens, a second lens and a third lens along an optical axis from the object side to the image side, and the first lens to the third lens each include an orientation a side of the object that passes the imaging light and an image side that faces the image side and passes the imaging light; the image side of the first lens has a convex portion in the vicinity of the circumference; and the second lens has a negative The light side, the image side of the second lens has a convex portion located in the vicinity of the optical axis; wherein the optical imaging lens has only three lenses having a refractive power, and the optical imaging lens conforms to: 2×ν1≦ν2 +ν3, where ν1 is the dispersion coefficient of the first lens, ν2 is the dispersion coefficient of the second lens, and ν3 is the dispersion coefficient of the third lens. The optical imaging lens of claim 1, wherein the optical imaging lens is more in conformity with: EFL/T2 ≦ 6.3, wherein EFL is a system focal length of the optical imaging lens, and T2 is the second lens at the optical axis The thickness on the top. The optical imaging lens of claim 2, wherein the optical imaging lens is more in accordance with: (G1+T1)/BFL≦1.3, wherein G1 is the first lens to the second lens on the optical axis. The air gap, T1 is the thickness of the first lens on the optical axis, and BFL is the distance from the image side of the third lens to the imaging surface of the optical imaging lens on the optical axis. The optical imaging lens of claim 1, wherein the optical imaging lens is more in conformity to: EFL/(T2+T1) ≦ 2.8, wherein EFL is a system focal length of the optical imaging lens, and T2 is the second lens The thickness on the optical axis, and T1 is the thickness of the first lens on the optical axis. The optical imaging lens of claim 4, wherein the optical imaging lens is more conformable to: (T2+G1)/BFL≦1.1, wherein G1 is the first lens to the second lens on the optical axis An air gap, and the BFL is the distance from the image side of the third lens to the imaging surface of the optical imaging lens on the optical axis. The optical imaging lens of claim 1, wherein the optical imaging lens is more in conformity with: BFL/T1 ≦ 2.6, wherein the BFL is the image side of the third lens to the imaging surface of the optical imaging lens at the light The distance on the axis, and T1 is the thickness of the first lens on the optical axis. The optical imaging lens of claim 6, wherein the optical imaging lens is more conformable to: 1.1 ≦ EFL/ALT, wherein EFL is a system focal length of the optical imaging lens, and ALT is the first lens, the second The sum of the thickness of the lens and the third lens on the optical axis. The optical imaging lens of claim 1, wherein the optical imaging lens is more in accordance with: EFL/T1≦5.2, wherein EFL is a system focal length of the optical imaging lens, and T1 is the first lens on the optical axis. The thickness on the top. The optical imaging lens of claim 8, wherein the optical imaging lens is more conformable to: 0.9 ≦ EFL / TL, wherein TL is the object side of the first lens to the image side of the third lens The distance on the optical axis. The optical imaging lens of claim 1, wherein the optical imaging lens is more in accordance with: (T2+G2)/T2≦1.7, wherein T2 is the thickness of the second lens on the optical axis, and G2 is An air gap of the second lens to the third lens on the optical axis. The optical imaging lens of claim 10, wherein the optical imaging lens is more conformable to: (T2+G1)/G2≦3.7, wherein G1 is the first lens to the second lens on the optical axis Air gap. The optical imaging lens of claim 1, wherein the optical imaging lens is more in accordance with: (T1+G2)/T1≦1.5, wherein T1 is the thickness of the first lens on the optical axis, and G2 is An air gap of the second lens to the third lens on the optical axis. The optical imaging lens of claim 12, wherein the optical imaging lens is more in accordance with: (G1+T1)/G2≦4.1, wherein G1 is the first lens to the second lens on the optical axis Air gap. The optical imaging lens of claim 1, wherein the optical imaging lens is more in accordance with: (T2+G2)/T1≦1.4, wherein T2 is the thickness of the second lens on the optical axis, and G2 is the An air gap of the second lens to the third lens on the optical axis, and T1 is a thickness of the first lens on the optical axis. The optical imaging lens of claim 14, wherein the optical imaging lens is more in accordance with: ALT/G2 ≦ 7.5, wherein ALT is the first lens, the second lens, and the third lens are on the optical axis The sum of the thicknesses. The optical imaging lens of claim 1, wherein the optical imaging lens is more in conformity to: EFL/(T2+T3) ≦ 2.7, wherein EFL is a system focal length of the optical imaging lens, and T2 is the second lens The thickness on the optical axis, and T3 is the thickness of the third lens on the optical axis. The optical imaging lens of claim 16, wherein the optical imaging lens is more in accordance with: (T2+T3) / G2 ≦ 4.7, wherein G2 is the second lens to the third lens on the optical axis Air gap. The optical imaging lens of claim 1, wherein the optical imaging lens is more in accordance with: (T1+T3)/T1≦1.9, wherein T1 is the thickness of the first lens on the optical axis, and T3 is The thickness of the third lens on the optical axis. The optical imaging lens of claim 18, wherein the optical imaging lens is more in accordance with: (T1+G2)/G2≦3.7, wherein G2 is the second lens to the third lens on the optical axis. Air gap. A portable electronic device comprising: a casing; and an image module mounted in the casing, and comprising: optical imaging according to any one of claims 1 to 19. a lens barrel for the optical imaging lens; a module rear seat unit for the lens barrel; and an image sensor disposed on the image side of the optical imaging lens.