Image lens

Abstract

An image-taking lens comprises, from the object side to the image side, five lenses sequentially arranged along the optical axis, each possessing a positive refractive power, a positive refractive power, a negative refractive power, a positive refractive power, and a negative refractive power, respectively. The image-taking lens has a total of five lenses with refractive power, wherein the first to fifth lenses are aspherical lenses. The image-taking lens performs a focusing stroke by moving the fifth lens, satisfying the condition 2.5 < |f2 / f3| < 5.5, where f2 is the focal length of the second lens and f3 is the focal length of the third lens.

Description

Technical Field

[0001] This invention relates to an optical element, and more particularly to an image-capturing lens. Background Technology

[0002] With the rapid evolution of portable electronic devices, the optical imaging lens, a key component, is also becoming increasingly diversified. For imaging lenses in portable electronic devices, not only are larger apertures and shorter overall lens lengths required, but higher pixel counts and higher resolutions are also sought after. To meet various design needs, imaging lenses often include multiple lenses, and the focusing process can alter the overall lens length, making them unsuitable for inclusion in thin portable electronic devices. Summary of the Invention

[0003] The present invention provides an image-capturing lens that does not change the overall length of the lens during the focusing process, making it suitable for mounting on thin, portable electronic devices.

[0004] According to an embodiment of the present invention, an imaging lens is provided, comprising, sequentially from the object side to the image side along the optical axis, a first lens to a fifth lens, each having a positive refractive power, a positive refractive power, a negative refractive power, a positive refractive power, and a negative refractive power, respectively. The imaging lens comprises five lenses with refractive power, wherein the first to fifth lenses are aspherical lenses. The imaging lens performs a focusing stroke by moving the fifth lens, satisfying the condition 2.5 < |f2 / f3| < 5.5, where f2 is the focal length of the second lens and f3 is the focal length of the third lens.

[0005] Based on the above, the imaging lens provided in this embodiment of the invention performs the focusing stroke by moving the fifth lens, and the total length of the imaging lens remains fixed during focusing. Therefore, it is suitable for being configured on a thin portable electronic device, and can be used as the front lens of a portable electronic device.

[0006] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1A A schematic diagram of an image-capturing lens according to a first embodiment of the present invention is shown. Figure 1B and Figure 1C This is a schematic diagram of the field curvature of the imaging lens in the first embodiment. Figure 1D This is a schematic diagram of the distortion of the imaging lens in the first embodiment;

[0008] Figure 2A A schematic diagram of an image-capturing lens according to a second embodiment of the present invention is shown. Figure 2B and Figure 2C This is a schematic diagram of the field curvature of the imaging lens in the second embodiment. Figure 2DThis is a schematic diagram of the distortion of the imaging lens in the second embodiment;

[0009] Figure 3A A schematic diagram of an image-capturing lens according to a third embodiment of the present invention is shown. Figure 3B and Figure 3C This is a schematic diagram of the field curvature of the imaging lens in the third embodiment. Figure 3D This is a schematic diagram of the distortion of the imaging lens in the third embodiment.

[0010] Explanation of icon numbers:

[0011] 0: Aperture;

[0012] 1, 2, 3, 4, 5: Lenses;

[0013] 8: Filters;

[0014] 10: Image capture lens;

[0015] 15, 25, 35, 45, 55, 85: Side view of the object;

[0016] 16, 26, 36, 46, 56, 86: like a side view;

[0017] 99: Imaging plane;

[0018] A1: Object side;

[0019] A2: Image side;

[0020] I: optical axis. Detailed Implementation

[0021] Reference Figure 1A This diagram illustrates an imaging lens according to a first embodiment of the present invention. The imaging lens 10 of the first embodiment of the present invention includes, sequentially along the optical axis I of the imaging lens 10 from the object side A1 to the image side A2, an aperture 0, lenses 1 to 5, and a filter 8. When light emitted from an object to be photographed enters the imaging lens 10 and sequentially passes through the aperture 0, lenses 1, 2, 3, 4, 5, and filter 8, an image is formed on the image plane 99. The filter 8 is, for example, an infrared cut-off filter, which allows light of appropriate wavelengths (e.g., infrared or visible light) to pass through while filtering out the desired infrared band. The filter 8 is disposed between the lens 5 and the image plane 99. It should be noted that the object side A1 is the side facing the object to be photographed, while the image side A2 is the side facing the image plane 99.

[0022] In this embodiment, the lens 1, lens 2, lens 3, lens 4, lens 5, and filter 8 of the imaging lens 10 each have an object-side surface 15, 25, 35, 45, 55, 85 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 86 facing the image side A2 and allowing imaging light to pass through. In this embodiment, the aperture 0 is located on the object side A1 of the lens 1.

[0023] Lens 1 has positive refracting power. The optical axis region of its object side 15 is convex, and the optical axis region of its image side 16 is convex. Both the object side 15 and the image side 16 are aspherical.

[0024] Lens 2 has positive refractive power. The optical axis region of its object side 25 is convex, and the optical axis region of its image side 26 is convex. Both the object side 25 and the image side 26 are aspherical.

[0025] Lens 3 has negative refracting power. The optical axis region of its object side 35 is concave, and the optical axis region of its image side 36 is concave. Both the object side 35 and the image side 36 are aspherical.

[0026] Lens 4 has positive refractive power. The optical axis region of its object side 45 is convex, and the optical axis region of its image side 46 is convex. Both the object side 45 and the image side 46 are aspherical.

[0027] Lens 5 has negative refractive power. Its object side 55 has a convex optical axis region, and its image side 56 has a concave optical axis region. Both the object side 55 and the image side 56 are aspherical.

[0028] Other detailed optical data for the first embodiment are shown in Table 1, wherein the image height (ImgH) is half of the 99-degree diagonal of the imaging plane.

[0029] Table 1:

[0030]

[0031] In Table 1, the spacing of the object side 15 (0.644 mm as shown in Table 1) is the thickness of lens 1 on optical axis I, and the spacing of the image side 16 (0.247 mm as shown in Table 1) is the distance between the image side 16 of lens 1 and the object side 25 of lens 2 on optical axis I, which is the gap between lens 1 and lens 2 on optical axis I, and so on.

[0032] It should be noted that the image-capturing lens 10 performs the focusing stroke by moving the lens 5 between the lens 4 and the filter 8 along the optical axis I. Therefore, the total length of the image-capturing lens 10 can be kept fixed during the focusing stroke, making the image-capturing lens 10 suitable for placement on thin portable electronic devices, especially as the front lens of portable electronic devices. However, the present invention is not limited thereto; the image-capturing lens 10 can also be used as the rear lens of portable electronic devices, or disposed on other electronic devices.

[0033] It should also be noted that the column marked A in Table 1 represents the focusing range of the imaging lens 10, specifically, the distance between the focusing range of the imaging lens 10 and the object side surface 15 of the lens 1. In this embodiment, the range of the above-mentioned column A is greater than or equal to 150mm. In other words, the focusing range of the imaging lens 10 is the range from 150mm away from the object side surface 15 in the direction of object side A1 to infinity. Among them, when the focusing position is the aforementioned position 150mm away from the object side surface 15 of the lens 1 (i.e., when column A is 150mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e., column B in Table 1) is 0.172mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e., column C in Table 1) is 0.490mm. Conversely, when the focusing position is at an infinity distance from the object side 15 of lens 1 (i.e., when column A is infinity), the gap between lens 4 and lens 5 on optical axis I (i.e., column B in Table 1) is 0.100 mm, and the gap between lens 5 and filter 8 on optical axis I (i.e., column C in Table 1) is 0.562 mm.

[0034] In this embodiment, the object surfaces 15, 25, 35, 45, and 55 of lenses 1, 2, 3, 4, and 5, and the image surfaces 16, 26, 36, 46, and 56 of lenses 1, 2, 3, 4, and 5 are all aspherical surfaces, and these aspherical surfaces are defined according to the following formula (1):

[0035]

[0036] Y: The distance between a point on the aspherical curve and the optical axis;

[0037] Z: Aspherical depth, which is the perpendicular distance between a point on the aspherical surface that is a distance Y from the optical axis and a tangent plane that is tangent to the vertex on the optical axis of the aspherical surface.

[0038] R: Radius of curvature of the lens surface;

[0039] K: Conic coefficient;

[0040] a 2i : The second-order aspherical coefficient.

[0041] In this embodiment, the conic coefficient K and various aspherical coefficients in the above aspherical formula (1) are shown in Table 2. In Table 2, number 15 indicates that it is the aspherical coefficient of the object side 15 of lens 1, number 16 indicates that it is the aspherical coefficient of the image side 16 of lens 1, and so on.

[0042] Table 2:

[0043] noodle K <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> <![CDATA[a 10 ]]> 15 0.00E+00 -2.67E-02 -8.46E-02 3.62E-02 2.56E-01 16 0.00E+00 -1.60E-01 -9.96E-02 -8.17E-02 0.00E+00 25 0.00E+00 -2.05E-01 -5.30E-01 1.28E+00 -3.70E+00 26 0.00E+00 -4.22E-01 -1.24E-02 1.25E-02 5.94E-03 35 0.00E+00 -3.34E-01 1.75E-01 -1.22E-02 7.92E-03 36 0.00E+00 -3.95E-01 3.54E-01 -5.06E-02 1.94E-02 45 0.00E+00 -3.98E-01 3.22E-01 -5.09E-02 -1.83E-02 46 0.00E+00 1.45E-01 1.11E-01 -1.70E-01 -2.12E-01 55 0.00E+00 -6.07E+00 -3.65E-01 -5.84E-01 1.28E-02 56 0.00E+00 -2.62E+01 -8.19E+00 9.98E-01 3.26E+00 noodle <![CDATA[a 12 ]]> <![CDATA[a 14 ]]> <![CDATA[a 16 ]]> <![CDATA[a 18 ]]> <![CDATA[a 20 ]]> 15 -9.30E-01 6.15E-01 -1.61E-01 0.00E+00 0.00E+00 16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 3.89E+00 -2.77E+00 1.71E+00 0.00E+00 0.00E+00 26 2.98E-03 1.12E-03 2.76E-04 0.00E+00 0.00E+00 35 -7.82E-04 -2.80E-03 -1.18E-03 0.00E+00 0.00E+00 36 -1.02E-02 -2.19E-03 4.75E-04 0.00E+00 0.00E+00 45 7.63E-03 9.62E-03 3.40E-03 3.83E-03 3.57E-03 46 -5.08E-02 5.51E-02 6.05E-02 2.53E-02 4.91E-03 55 -1.26E-01 -2.00E-01 -2.09E-02 9.33E-02 4.83E-02 56 4.12E-01 -1.57E+00 -1.58E+00 -6.70E-01 -1.40E-01

[0044] See also Figures 1B to 1D , Figure 1B The graph shows the field curvature aberration in the meridional direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the first embodiment. Figure 1C The diagram shows the field curvature aberration in the sagittal direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the first embodiment. Figure 1D The graph shows the distortion curves when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm is incident on the imaging lens 10 of the first embodiment.

[0045] like Figure 1B as well as Figure 1C As shown in the field curvature aberration curve, the field curvature aberration of the five representative wavelengths falls within ±0.10 mm across the entire field of view, indicating that the imaging lens 10 of the first embodiment of the present invention can effectively eliminate field curvature aberration. Figure 1D As shown in the distortion curve, the distortion aberration of the five representative wavelengths is less than ±2% throughout the entire field of view, indicating that the imaging lens 10 of the first embodiment of the present invention has good imaging quality.

[0046] To fully illustrate the various embodiments of the present invention, other embodiments will be described below. It must be noted that the following embodiments use the same element reference numerals and some content as those in the foregoing embodiments, with the same reference numerals representing the same or similar elements, and descriptions of identical technical content omitted. For explanations of the omitted parts, please refer to the foregoing embodiments; these will not be repeated in the following embodiments.

[0047] Reference Figure 2AThis diagram illustrates an imaging lens according to a second embodiment of the present invention. The imaging lens 10 of the second embodiment of the present invention includes, sequentially along the optical axis I of the imaging lens 10 from the object side A1 to the image side A2, an aperture 0, lenses 1 to 5, and a filter 8. When light emitted from an object to be photographed enters the imaging lens 10 and sequentially passes through the aperture 0, lenses 1, 2, 3, 4, 5, and filter 8, an image is formed on the imaging surface 99.

[0048] In this embodiment, the lens 1, lens 2, lens 3, lens 4, lens 5, and filter 8 of the imaging lens 10 each have an object-side surface 15, 25, 35, 45, 55, 85 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 86 facing the image side A2 and allowing imaging light to pass through. In this embodiment, the aperture 0 is located on the object side A1 of the lens 1.

[0049] Lens 1 has positive refractive power. The optical axis region of its object side 15 is convex, and the optical axis region of its image side 16 is convex. Both the object side 15 and the image side 16 are aspherical.

[0050] Lens 2 has positive refractive power. The optical axis region of its object side 25 is convex, and the optical axis region of its image side 26 is convex. Both the object side 25 and the image side 26 are aspherical.

[0051] Lens 3 has negative refractive power. The optical axis region of its object side 35 is concave, and the optical axis region of its image side 36 is concave. Both the object side 35 and the image side 36 are aspherical.

[0052] Lens 4 has positive refractive power. The optical axis region of its object side 45 is convex, and the optical axis region of its image side 46 is convex. Both the object side 45 and the image side 46 are aspherical.

[0053] Lens 5 has negative refractive power. Its object side 55 has a convex optical axis region, and its image side 56 has a concave optical axis region. Both the object side 55 and the image side 56 are aspherical.

[0054] Other detailed optical data for the second embodiment are shown in Table 3, wherein the image height is half of the diagonal of the imaging plane 99.

[0055] Table 3:

[0056]

[0057] In Table 3, the spacing of the object side 15 (0.630 mm as shown in Table 3) is the thickness of lens 1 on optical axis I, and the spacing of the image side 16 (0.196 mm as shown in Table 3) is the distance between the image side 16 of lens 1 and the object side 25 of lens 2 on optical axis I, which is the gap between lens 1 and lens 2 on optical axis I, and so on.

[0058] The image-capturing lens 10 performs the focusing stroke by moving the lens 5 between the lens 4 and the filter 8 along the optical axis I. Therefore, the total length of the image-capturing lens 10 can be kept fixed during the focusing stroke, making the image-capturing lens 10 suitable for placement on thin portable electronic devices, especially as the front lens of portable electronic devices. However, the present invention is not limited thereto; the image-capturing lens 10 can also be used as the rear lens of portable electronic devices, or disposed on other electronic devices.

[0059] In Table 3, the column marked A represents the distance between the focusing range of the imaging lens 10 and the object side surface 15 of the lens 1. In this embodiment, the range of column A is greater than or equal to 150 mm. In other words, the focusing range of the imaging lens 10 is the range from 150 mm away from the object side surface 15 in the direction of object side A1 to infinity. Specifically, when the focusing position is the aforementioned position 150 mm away from the object side surface 15 of the lens 1 (i.e., when column A is 150 mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e., column B in Table 3) is 0.168 mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e., column C in Table 3) is 0.500 mm. Conversely, when the focusing position is at an infinity distance from the object side 15 of lens 1 (i.e., when column A is infinity), the gap between lens 4 and lens 5 on optical axis I (i.e., column B in Table 3) is 0.100 mm, and the gap between lens 5 and filter 8 on optical axis I (i.e., column C in Table 3) is 0.568 mm.

[0060] In this embodiment, the object surfaces 15, 25, 35, 45, and 55 of lenses 1, 2, 3, 4, and 5, as well as the image surfaces 16, 26, 36, 46, and 56 of lenses 1, 2, 3, 4, and 5, are all aspherical surfaces, and these aspherical surfaces are defined according to the aspherical surface formula (1) above.

[0061] In this embodiment, the conic coefficient K and various aspherical coefficients in the above aspherical formula (1) are shown in Table 4. In Table 4, number 15 indicates that it is the aspherical coefficient of the object side 15 of lens 1, number 16 indicates that it is the aspherical coefficient of the image side 16 of lens 1, and so on.

[0062] Table 4:

[0063] noodle K <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> <![CDATA[a 10 ]]> 15 0.00E+00 -2.84E-02 -1.24E-01 1.87E-01 9.19E-03 16 0.00E+00 -1.96E-01 -1.08E-01 -1.43E-01 0.00E+00 25 0.00E+00 -2.21E-01 -5.96E-01 1.19E+00 -3.71E+00 26 0.00E+00 -4.52E-01 -2.86E-02 1.29E-02 3.36E-03 35 0.00E+00 -3.23E-01 1.59E-01 -1.03E-02 5.36E-03 36 0.00E+00 -4.63E-01 4.16E-01 -4.06E-02 2.86E-02 45 0.00E+00 -4.05E-01 4.55E-01 -5.70E-02 -1.21E-02 46 0.00E+00 2.91E-01 2.28E-01 -2.71E-01 -2.59E-01 55 0.00E+00 -7.75E+00 3.12E-01 -3.90E-01 -1.42E-01 56 0.00E+00 -2.54E+01 -7.85E+00 1.07E+00 3.23E+00 noodle <![CDATA[a 12 ]]> <![CDATA[a 14 ]]> <![CDATA[a 16 ]]> <![CDATA[a 18 ]]> <![CDATA[a 20 ]]> 15 -9.30E-01 6.15E-01 -1.61E-01 0.00E+00 0.00E+00 16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 3.89E+00 -2.77E+00 1.71E+00 0.00E+00 0.00E+00 26 1.37E-03 6.19E-04 2.01E-04 0.00E+00 0.00E+00 35 -4.19E-03 -2.35E-03 -1.25E-03 0.00E+00 0.00E+00 36 -1.93E-02 -1.97E-03 -1.93E-04 0.00E+00 0.00E+00 45 2.33E-03 7.48E-03 3.93E-03 7.20E-03 5.39E-03 46 -4.85E-02 6.62E-02 5.66E-02 1.62E-02 8.40E-04 55 -1.93E-01 -1.40E-01 -2.66E-02 5.41E-02 3.38E-02 56 4.09E-01 -1.63E+00 -1.66E+00 -7.23E-01 -1.50E-01

[0064] See also Figures 2B to 2D , Figure 2B The graph shows the field curvature aberration in the meridional direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the second embodiment. Figure 2C The graph shows the field curvature aberration in the sagittal direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the second embodiment. Figure 2D The graph shows the distortion curves when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm is incident on the imaging lens 10 of the second embodiment.

[0065] like Figure 2B as well as Figure 2C As shown in the field curvature aberration curve, the field curvature aberration of the five representative wavelengths falls within ±0.10 mm across the entire field of view, indicating that the imaging lens 10 of the second embodiment of the present invention can effectively eliminate field curvature aberration. Figure 2D As shown in the distortion curve, the distortion aberration of the five representative wavelengths is less than ±2% throughout the entire field of view, indicating that the imaging lens 10 of the second embodiment of the present invention has good imaging quality.

[0066] Reference Figure 3A This diagram illustrates an imaging lens according to a third embodiment of the present invention. The imaging lens 10 of the third embodiment of the present invention includes, sequentially along the optical axis I of the imaging lens 10 from the object side A1 to the image side A2, an aperture 0, lenses 1 to 5, and a filter 8. When light emitted from an object to be photographed enters the imaging lens 10 and sequentially passes through the aperture 0, lenses 1, 2, 3, 4, 5, and filter 8, an image is formed on the imaging plane 99.

[0067] In this embodiment, the lens 1, lens 2, lens 3, lens 4, lens 5, and filter 8 of the imaging lens 10 each have an object-side surface 15, 25, 35, 45, 55, 85 facing the object side A1 and allowing imaging light to pass through, and an image-side surface 16, 26, 36, 46, 56, 86 facing the image side A2 and allowing imaging light to pass through. In this embodiment, the aperture 0 is located on the object side A1 of the lens 1.

[0068] Lens 1 has positive refractive power. Its object-side surface 15 has a convex optical axis region, and its image-side surface 16 has a concave optical axis region. Both the object-side surface 15 and the image-side surface 16 are aspherical.

[0069] Lens 2 has positive refractive power. The optical axis region of its object side 25 is convex, and the optical axis region of its image side 26 is convex. Both the object side 25 and the image side 26 are aspherical.

[0070] Lens 3 has negative refractive power. The optical axis region of its object side 35 is concave, and the optical axis region of its image side 36 is concave. Both the object side 35 and the image side 36 are aspherical.

[0071] Lens 4 has positive refractive power. The optical axis region of its object side 45 is convex, and the optical axis region of its image side 46 is convex. Both the object side 45 and the image side 46 are aspherical.

[0072] Lens 5 has negative refractive power. Its object side 55 has a convex optical axis region, and its image side 56 has a concave optical axis region. Both the object side 55 and the image side 56 are aspherical.

[0073] Other detailed optical data for the third embodiment are shown in Table 5, wherein the image height is half of the diagonal of the imaging plane 99.

[0074] Table 5:

[0075]

[0076] In Table 5, the spacing of the object side 15 (0.596 mm as shown in Table 5) is the thickness of lens 1 on optical axis I, and the spacing of the image side 16 (0.177 mm as shown in Table 5) is the distance between the image side 16 of lens 1 and the object side 25 of lens 2 on optical axis I, which is the gap between lens 1 and lens 2 on optical axis I, and so on.

[0077] The image-capturing lens 10 performs the focusing stroke by moving the lens 5 between the lens 4 and the filter 8 along the optical axis I. Therefore, the total length of the image-capturing lens 10 can be kept fixed during the focusing stroke, making the image-capturing lens 10 suitable for placement on thin portable electronic devices, especially as the front lens of portable electronic devices. However, the present invention is not limited thereto; the image-capturing lens 10 can also be used as the rear lens of portable electronic devices, or disposed on other electronic devices.

[0078] In Table 5, the column marked A represents the distance between the focusing range of the imaging lens 10 and the object side surface 15 of the lens 1. In this embodiment, the range of column A is greater than or equal to 150 mm. In other words, the focusing range of the imaging lens 10 is the range from 150 mm away from the object side surface 15 in the direction of object side A1 to infinity. Specifically, when the focusing position is the aforementioned position 150 mm away from the object side surface 15 of the lens 1 (i.e., when column A is 150 mm), the gap between the lens 4 and the lens 5 on the optical axis I (i.e., column B in Table 5) is 0.156 mm, and the gap between the lens 5 and the filter 8 on the optical axis I (i.e., column C in Table 5) is 0.485 mm. Conversely, when the focusing position is at an infinity distance from the object side 15 of lens 1 (i.e., when column A is infinity), the gap between lens 4 and lens 5 on optical axis I (i.e., column B in Table 5) is 0.100 mm, and the gap between lens 5 and filter 8 on optical axis I (i.e., column C in Table 5) is 0.541 mm.

[0079] In this embodiment, the object surfaces 15, 25, 35, 45, and 55 of lenses 1, 2, 3, 4, and 5, as well as the image surfaces 16, 26, 36, 46, and 56 of lenses 1, 2, 3, 4, and 5, are all aspherical surfaces, and these aspherical surfaces are defined according to the aspherical surface formula (1) above.

[0080] In this embodiment, the conic coefficient K and various aspherical coefficients in the above aspherical formula (1) are shown in Table 6. In Table 6, number 15 indicates that it is the aspherical coefficient of the object side 15 of lens 1, number 16 indicates that it is the aspherical coefficient of the image side 16 of lens 1, and other numbers follow the same pattern.

[0081] Table 6:

[0082] noodle K <![CDATA[a4]]> <![CDATA[a6]]> <![CDATA[a8]]> <![CDATA[a 10 ]]> 15 0.00E+00 -3.57E-02 -1.20E-01 1.42E-01 -1.30E-02 16 0.00E+00 -2.20E-01 -1.45E-01 -2.12E-01 0.00E+00 25 0.00E+00 -2.24E-01 -6.04E-01 1.16E+00 -3.76E+00 26 0.00E+00 -4.64E-01 -2.85E-02 1.89E-02 3.74E-03 35 0.00E+00 -3.14E-01 1.61E-01 -7.41E-03 1.25E-03 36 0.00E+00 -5.10E-01 4.54E-01 -3.91E-02 3.87E-02 45 0.00E+00 -4.11E-01 4.60E-01 -3.92E-02 -2.86E-02 46 0.00E+00 3.41E-01 2.14E-01 -3.11E-01 -2.79E-01 55 0.00E+00 -1.03E+01 1.24E+00 -4.60E-01 -4.19E-01 56 0.00E+00 -2.53E+01 -8.04E+00 9.98E-01 3.18E+00 noodle <![CDATA[a 12 ]]> <![CDATA[a 14 ]]> <![CDATA[a 16 ]]> <![CDATA[a 18 ]]> <![CDATA[a 20 ]]> 15 -9.30E-01 6.15E-01 -1.61E-01 0.00E+00 0.00E+00 16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 25 3.89E+00 -2.77E+00 1.71E+00 0.00E+00 0.00E+00 26 1.13E-04 -1.42E-04 1.35E-04 0.00E+00 0.00E+00 35 -6.37E-03 -3.41E-03 -1.09E-03 0.00E+00 0.00E+00 36 -2.34E-02 -4.99E-03 -7.30E-04 0.00E+00 0.00E+00 45 -3.34E-03 5.94E-03 1.02E-02 1.19E-02 6.40E-03 46 -4.00E-02 7.11E-02 4.86E-02 9.95E-03 -1.20E-03 55 -1.48E-01 -5.24E-02 -6.03E-02 -9.02E-04 1.77E-02 56 4.34E-01 -1.66E+00 -1.70E+00 -7.50E-01 -1.48E-01

[0083] See also Figures 3B to 3D , Figure 3B The graph shows the field curvature aberration in the meridional direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the third embodiment. Figure 3C The diagram shows the field curvature aberration in the sagittal direction when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm is incident on the imaging lens 10 of the third embodiment. Figure 3D The graph shows the distortion curves when light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm is incident on the imaging lens 10 of the third embodiment.

[0084] like Figure 3B and Figure 3C As shown in the field curvature aberration curve of Figure 3C , the field curvature aberrations of the five representative wavelengths within the entire field of view fall within ±0.05 mm, indicating that the imaging lens 10 of the third embodiment of the present invention can effectively eliminate field curvature aberration. As Figure 3D As shown in the distortion curve of Figure 3D , the distortion aberrations of the five representative wavelengths within the entire field of view are less than ±2%, indicating that the imaging lens 10 of the third embodiment of the present invention has good imaging quality.

[0085] Each embodiment of the present invention satisfies the conditional expression 2.5 < ∣f2 / f3∣ < 5.5, where f2 is the focal length of lens 2 and f3 is the focal length of lens 3.

[0086] Each embodiment of the present invention satisfies the conditional expression 1.35 < TTL / ImgH < 1.5, where TTL is the distance from the object side surface 15 of lens 1 to the imaging surface 99 on the optical axis I, and ImgH is half of the diagonal of the imaging surface 99 (image height).

[0087] Each embodiment of the present invention satisfies the conditional expression 2.5 < TTL / ENPD < 4.5, where TTL is the distance from the object side surface 15 of lens 1 to the imaging surface 99 on the optical axis I, and ENPD is the size of the entrance pupil of the imaging lens 10. The sizes of the entrance pupils of the imaging lenses 10 of the first to third embodiments are 1.1 mm, 1.32 mm, and 1.4 mm respectively.

[0088] Each embodiment of the present invention satisfies the conditional expression 3 < (T2 + D23 + T3) / D23 < 6, where T2 is the thickness of lens 2 on the optical axis I, T3 is the thickness of lens 3 on the optical axis I, and D23 is the gap between lens 2 and lens 3 on the optical axis I.

[0089] Each embodiment of the present invention satisfies the conditional expression 0.2 < R15 / R56 < 0.3, where R15 is the radius of the object side surface 15 of lens 1, and R56 is the radius of the image side surface 56 of lens 5. The radii of the object side surfaces 15 of the first to third embodiments are 0.685 mm, 0.661 mm, and 0.551 mm respectively, and the radii of the image side surfaces 56 are 2.443 mm, 2.415 mm, and 2.392 mm respectively.

[0090] Each embodiment of the present invention satisfies the conditional expression 5 < 1000ZL / TTL < 40, where TTL is the distance from the object side surface 15 of lens 1 to the imaging surface 99 on the optical axis I, and ZL is the moving distance of lens 5 during the focusing stroke of the imaging lens 10.

[0091] In summary, the imaging lens provided in this embodiment of the invention performs the focusing stroke by moving the fifth lens, the total length of the imaging lens remains fixed during focusing, and the imaging quality is high. Therefore, it is suitable for being configured on thin portable electronic devices, especially as the front lens of portable electronic devices.

Claims

1. An image-capturing lens, characterized in that, It sequentially includes, along the optical axis from the object side to the image side: A first lens, having a positive refractive power; A second lens, having a positive refractive power; A third lens, having a negative refractive power; A fourth lens, having a positive refractive power; And A fifth lens, having a negative refractive power, The imaging lens has a total of five lenses with refractive powers, wherein the first lens to the fifth lens are aspherical lenses, and the imaging lens performs a focusing stroke by moving the fifth lens, The imaging lens satisfies the conditional expression 2.5 < ∣f2 / f3∣ < 5.5, where f2 is the focal length of the second lens and f3 is the focal length of the third lens, The imaging lens further satisfies the conditional expression 5 < 1000ZL / TTL < 40, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, and ZL is the moving distance of the fifth lens during the focusing stroke of the imaging lens, and the distance between the focusing range of the imaging lens and the object side surface of the first lens is greater than or equal to 150 mm.

2. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies the conditional expression 1.35 < TTL / ImgH < 1.5, where ImgH is half of the diagonal of the imaging surface.

3. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies the conditional expression 2.5 < TTL / ENPD < 4.5, where ENPD is the size of the entrance pupil of the imaging lens.

4. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies the conditional expression 1.7 < (T2 + D23 + T3) / D23 < 2.4, where T2 is the thickness of the second lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and D23 is the gap between the second lens and the third lens on the optical axis.

5. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies the conditional expression 0.2 < R15 / R56 < 0.3, where R15 is the radius of the object side surface of the first lens and R56 is the radius of the image side surface of the fifth lens.

6. The imaging lens according to claim 1, characterized in that, The F value of the imaging lens is greater than or equal to 2.0 and less than or equal to 2.

2.

7. The imaging lens according to claim 1, characterized in that, The full field angle of the imaging lens is greater than or equal to 90° and less than or equal to 100°.

Images