A power booster

Abstract

This invention provides a teleconverter lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially along the optical axis from the object side to the image side; satisfying: ; wherein, the first lens to the ninth lens form the front group of the system, and the combined focal length of the front group is , and the tenth lens to the thirteenth lens form the rear group of the system, and the combined focal length of the rear group is . Embodiments of this invention provide a novel zoom solution, achieving optical zoom functionality of an imaging lens by externally mounting a teleconverter lens.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a teleconverter lens. Background Technology

[0002] In recent years, with the advancement of technology and the people's growing material and cultural needs, people are no longer satisfied with the digital zoom of mobile phone lenses and are exploring optical zoom solutions for mobile phone lenses. However, single-lens optical zoom often results in a larger size, which leads to a larger size of the mobile phone camera module. Summary of the Invention

[0003] This invention provides a teleconverter lens to achieve a novel zoom solution, thereby enabling optical zoom of the imaging lens by using an external teleconverter lens.

[0004] This invention provides a magnifying lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially along the optical axis from the object side to the image side;

[0005] satisfy: ;

[0006] Wherein, the first lens to the ninth lens constitute the front group of the system, and the combined focal length of the front group of the system is... The tenth to thirteenth lenses form the rear group of the system, and the combined focal length of the rear group is [missing value]. .

[0007] Optionally, the optical power of the first lens is positive, the optical power of the second lens is negative, the optical power of the third lens is positive, the optical power of the fourth lens is positive, the optical power of the fifth lens is negative, the optical power of the sixth lens is positive, the optical power of the seventh lens is positive, the optical power of the ninth lens is negative, the optical power of the tenth lens is positive, the optical power of the eleventh lens is positive, the optical power of the twelfth lens is negative, and the optical power of the thirteenth lens is positive.

[0008] Optionally, the first to the fifth lenses form a first group, and the sixth to the twelfth lenses form a second group;

[0009] satisfy: ;

[0010] Wherein, the focal length of the first group is The focal length of the second group is .

[0011] Optionally, the first to the fifth lenses form a first group, and the thirteenth lens forms a third group;

[0012] satisfy: ;

[0013] The focal length of the third group is... .

[0014] Optionally, the first lens to the fifth lens form a first group;

[0015] satisfy: ;

[0016] Wherein, the focal length of the first lens is The focal length of the first group is .

[0017] Optionally,

[0018] Satisfy: 1.51 <nd1<1.96,1.42<nd9<2.15;

[0019] The first lens has a refractive index of nd1, and the ninth lens has a refractive index of nd9.

[0020] Optionally,

[0021] Satisfaction: 26.22 <vd2<42.92,56.81<vd4<99.25;

[0022] The Abbe number of the second lens is vd2, and the Abbe number of the fourth lens is vd4.

[0023] 8. The teleconverter lens according to claim 1, characterized in that,

[0024] Satisfaction: 34.03 <nd10×vd10<51.13;

[0025] The tenth lens has a refractive index of nd10 and an Abbe number of vd10.

[0026] 9. The teleconverter lens according to claim 1, characterized in that,

[0027] Satisfaction: 87.30 <nd11×vd11<107.18;

[0028] The eleventh lens has a refractive index of nd11 and an Abbe number of vd11.

[0029] 10. The teleconverter lens according to claim 1, characterized in that,

[0030] Satisfaction: 40.52 <nd12×vd12<58.84;

[0031] The refractive index of the twelfth lens is nd12, and the Abbe number of the twelfth lens is vd12.

[0032] The teleconverter lens provided in this embodiment of the invention employs 13 lenses, designated as the first to the thirteenth lenses. Lenses one through nine form the front group of the system, and lenses ten through thirteen form the rear group. The distance between the front group and the rear group is variable; increasing the distance allows for macro imaging. The ratio of the focal lengths of the front and rear groups is controlled to satisfy… The magnification of the teleconverter can be changed, ultimately achieving a magnification of 3× or higher to meet application requirements. The teleconverter can be paired with lens modules (i.e., imaging lenses) with a field of view of up to 30°, distortion at infinity is less than 1%, and the total length is within 110mm. Furthermore, the internal group of the teleconverter can be moved to achieve macro and infinity calibration, ultimately achieving the characteristics of high magnification, low distortion, short total length, and high image quality. Attached Figure Description

[0033] Figure 1 This is a detailed structural diagram of a magnifying lens according to Embodiment 1 of the present invention;

[0034] Figure 2 This is a chromatic aberration curve at infinity for a teleconverter lens according to Embodiment 1.

[0035] Figure 3 This is a near-object distance chromatic aberration curve of a teleconverter lens in this embodiment.

[0036] Figure 4 This is an infinity far-field curve diagram of a magnifying lens in this embodiment.

[0037] Figure 5 This is an infinity distortion curve of a teleconverter lens in this embodiment 1;

[0038] Figure 6 This is a near-object distance field curve diagram of a magnifying lens in this embodiment 1;

[0039] Figure 7 This is a near-object distance distortion curve of a teleconverter lens in this embodiment 1;

[0040] Figure 8 This is an MTF curve at infinity for a teleconverter lens in this embodiment.

[0041] Figure 9 This is a near-object distance MTF curve of a teleconverter lens in this embodiment 1;

[0042] Figure 10 This is a detailed structural diagram of a magnifying lens according to Embodiment 2;

[0043] Figure 11 This is a chromatic aberration curve at infinity for a magnifying lens in Embodiment 2.

[0044] Figure 12 This is a near-object distance chromatic aberration curve of a zoom lens in Embodiment 2;

[0045] Figure 13 This is an infinity far-field curve diagram of a magnifying lens in Embodiment 2;

[0046] Figure 14 This is an infinity distortion curve of a zoom lens in Embodiment 2.

[0047] Figure 15 This is a near-object distance field curve diagram of a magnifying lens in Embodiment 2;

[0048] Figure 16 This is a near-object distance distortion curve of a zoom lens in Embodiment 2;

[0049] Figure 17 This is an infinity MTF curve of a magnifying lens in Embodiment 2 of this invention;

[0050] Figure 18 This is a near-object distance MTF curve of a zoom lens in Embodiment 2;

[0051] Figure 19 This is a structural diagram of a magnifying lens according to Embodiment 3;

[0052] Figure 20 This is a chromatic aberration curve at infinity for a teleconverter lens in Embodiment 3.

[0053] Figure 21 This is a near-object distance chromatic aberration curve of a teleconverter lens in Embodiment 3;

[0054] Figure 22 This is an infinity field curve diagram of a magnifying lens in Embodiment 3;

[0055] Figure 23 This is an infinity distortion curve of a teleconverter lens in this embodiment three;

[0056] Figure 24 This is a near-object distance field curve diagram of a magnifying lens in Embodiment 3;

[0057] Figure 25 This is a near-object distance distortion curve of a teleconverter lens in this embodiment three;

[0058] Figure 26 This is an infinity MTF curve of a magnifying lens in Embodiment 3 of this invention;

[0059] Figure 27 This is a near-object distance MTF curve of a teleconverter lens in this embodiment three. Detailed Implementation

[0060] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0061] A teleconverter extends the focal length of an existing imaging lens. It acts as a concave lens and cannot form an image on its own; it must be used in conjunction with an existing imaging lens with a positive focal length to produce a clear image. This existing imaging lens could be, for example, the lens in a mobile phone or a camera.

[0062] Example 1

[0063] Figure 1 This is a detailed structural diagram of a magnifying lens according to Embodiment 1 of the present invention, with reference to... Figure 1 The teleconverter lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, and a thirteenth lens 13 arranged sequentially along the optical axis from the object side to the image side; satisfying: Among them, lenses 1 through 9 form the front group of the system; that is, the front group includes lens 1, lens 2, lens 3, lens 4, lens 5, lens 6, lens 7, lens 8, and lens 9. The combined focal length of the front group is... Lenses 10 through 13 form the rear group of the system; that is, the rear group includes lens 10, lens 11, lens 12, and lens 13. The combined focal length of the rear group is... .

[0064] The teleconverter lens provided in this embodiment of the invention employs 13 lenses, designated as lens 1 through lens 13. Lenses 1 through 9 form the front group of the system, and lenses 10 through 13 form the rear group. The distance d1 between the front group and the rear group is variable; a larger d1 enables macro imaging. The ratio of the focal lengths of the front and rear groups is controlled to satisfy... The magnification of the teleconverter can be changed, ultimately achieving a magnification of 3× or higher to meet application requirements. The teleconverter can be paired with lens modules (i.e., imaging lenses) with a field of view within 30°, distortion at infinity is less than 1%, and the total length is within 110mm. Furthermore, the internal groups of the teleconverter can be moved to achieve macro and infinity calibration, ultimately achieving high magnification, low distortion, short total length, and high image quality. The division between the front and rear groups of the system is optical; during zooming, the front and rear groups move relative to each other.

[0065] Optionally, the optical power of the first lens 1 is positive, the optical power of the second lens 2 is negative, the optical power of the third lens 3 is positive, the optical power of the fourth lens 4 is positive, the optical power of the fifth lens 5 is negative, the optical power of the sixth lens 6 is positive, the optical power of the seventh lens 7 is positive, the optical power of the ninth lens 9 is negative, the optical power of the tenth lens 10 is positive, the optical power of the eleventh lens 11 is positive, the optical power of the twelfth lens 12 is negative, and the optical power of the thirteenth lens 13 is positive. The optical power of the eighth lens 8 is either positive or negative.

[0066] Optionally, lenses 1 to 5 form a first group G1, meaning that the first group G1 includes lens 1, lens 2, lens 3, lens 4, and lens 5. Lenses 6 to 12 form a second group G2, meaning that the second group G2 includes lens 6, lens 7, lens 8, lens 9, lens 10, lens 11, and lens 12. This satisfies: Among them, the focal length of the first group G1 is The focal length of the second group G2 is By controlling the ratio of the focal lengths of the first group G1 to the second group G2, the lengths of the front and rear groups of the system can be reduced, making the total length of the teleconverter less than 110mm, achieving the characteristic of a short total length and improving its portability. The division of the first group G1, the second group G2, and the third group G3 is a physical division, placing lenses that are close together in the same group. The teleconverter forms an image in a single pass within the second group G2.

[0067] Optionally, the first lens 1 to the fifth lens 5 form the first group G1, and the thirteenth lens 13 forms the third group G3. That is, the third group G3 only includes the thirteenth lens 13; satisfying: Among them, the focal length of the first group G1 is The focal length of the third group G3 is . By controlling the ratio of the focal lengths of the second group G2 and the third group G3, the lengths of the front group and the rear group of the system can be reduced, making the total length of the teleconverter lens less than 110 mm, achieving the characteristic of a short total length of the teleconverter lens and improving the portability of the teleconverter lens.

[0068] Optionally, the first lens 1 to the fifth lens 5 are the first group G1; satisfying: ; where the focal length of the first lens 1 is , and the focal length of the first group G1 is . Reduce the distortion of the teleconverter lens.

[0069] Optionally, satisfying: 1.51 < nd1 < 1.96, 1.42 < nd9 < 2.15; where the refractive index of the first lens 1 is nd1, and the refractive index of the ninth lens 9 is nd9. By restricting the refractive indices of the lenses within the front group of the system, the chromatic aberration magnification of the system can be well controlled.

[0070] Optionally, satisfying: 26.22 < vd2 < 42.92, 56.81 < vd4 < 99.25; where the Abbe number of the second lens is vd2, and the Abbe number of the fourth lens is vd�4. By restricting the Abbe numbers of the lenses within the front group of the system, the chromatic aberration magnification of the system can be well controlled.

[0071] Optionally, satisfying: 34.03 < nd10 × vd10 < 51.13; where the refractive index of the tenth lens 10 is nd10, and the Abbe number of the tenth lens 10 is vd10. It is beneficial to reduce the off-axis aberration of the rear group of the system, thereby improving the overall resolution of the system.

[0072] Exemplarily, 1.63 < nd10 < 1.85. 19.29 < vd10 < 29.73.

[0073] Optionally, satisfying: 87.30 < nd11 × vd11 < 107.18; where the refractive index of the eleventh lens 11 is nd11, and the Abbe number of the eleventh lens 11 is vd11. It is beneficial to reduce the off-axis aberration of the rear group of the system, thereby improving the overall resolution of the system.

[0074] Exemplarily, 1.53 < nd11 < 1.80. 51.02 < vd10 < 66.57.

[0075] Optionally, satisfying: 40.52 < nd12 × vd12 < 58.84; where the refractive index of the twelfth lens 12 is nd12, and the Abbe number of the twelfth lens 12 is vd12. It is beneficial to reduce the off-axis aberration of the rear group of the system, thereby improving the overall resolution of the system.

[0076] Exemplarily, 1.69 < nd12 < 2.12. 20.26 < vd12 < 29.13.

[0077] Table 1. One design value for the magnifying lens in Example 1.

[0078]

[0079] Table 1 shows one design value for the teleconverter lens in Embodiment 1. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The teleconverter lens shown in Table 1 can be... Figure 1 As shown. A lens generally consists of two surfaces, each serving as a refractive surface. The surface numbers in Table 1 are assigned according to the surfaces of each lens. Surface number S1 represents the front surface (object side) of the first lens L1, surface number S2 represents the rear surface (image side) of the first lens L1, and so on; further details are omitted here. The radius of curvature represents the degree of curvature of the lens surface. A positive radius of curvature value indicates that the center of curvature is on the side of the surface closer to the image plane IMA; a negative radius of curvature value indicates that the center of curvature is on the side of the surface farther from the image plane IMA; a negative value indicates that the surface is bent towards the object plane. "Infinite" in the radius of curvature column indicates that the surface is planar with an infinite radius of curvature, expressed in mm. The value in the thickness column represents the axial distance between the current surface and the next surface, expressed in mm. The refractive index column represents the refractive index of the medium between the current and next surfaces, representing the material's ability to deflect light between them. The blank space in the refractive index column represents the refractive index of air, which is 1. The Abbe number represents the dispersion characteristics of light by the material between the current surface and the next surface; a blank space indicates the current location is air. Half-diameter refers to the radius of the lens's light-transmitting area (i.e., half the effective light-transmitting diameter), measured in mm.

[0080] For example, since the primary design objective is the teleconverter lens, not the imaging lens (i.e., the connecting lens), the imaging lens is represented as the ideal lens at the location of the aperture stop STO. As shown in Table 1, the 15mm corresponding to the row containing STO represents the ideal focal length of the imaging lens at the aperture stop STO as 15mm. In actual products, the imaging lens can be placed at the aperture stop STO. The imaging lens may include one or more lenses and occupy a certain amount of physical space.

[0081] Table 2 Object distance and focus position in Example 1

[0082]

[0083] In Table 1, when the object distance switching position is 2.305mm and the focus position is 15mm, the object distance of the teleconverter is infinity, representing an infinity object distance. When the object distance switching position is 13.074mm and the focus position is 15.309mm, the object distance of the teleconverter is 800mm, representing a close object distance.

[0084] Figure 2 This is a chromatic aberration curve at infinity for a teleconverter lens according to Embodiment 1. Figure 3 This is a near-object distance transverse chromatic aberration curve of a teleconverter lens according to Embodiment 1; Reference Figure 2 and Figure 3 In the figure, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum half-field of view angle; the horizontal direction represents the offset within the meridian range with 0.555μm as the reference, in micrometers (μm). The numbers on the curves in the figure represent the wavelengths represented by those curves, in micrometers (μm).

[0085] Figure 4 This is an infinity far-field curve diagram of a magnifying lens in this embodiment. Figure 5 This is an infinity distortion curve of a teleconverter lens in this embodiment 1; Figure 6 This is a near-object distance field curve diagram of a magnifying lens in this embodiment 1; Figure 7 This is a near-object distance distortion curve of a teleconverter lens in Embodiment 1; Reference Figures 4-7 Field curve diagram (such as) Figure 4 In the distortion diagram, the vertical direction represents the field of view angle, with 0 representing the field of view angle incident parallel to the optical axis, and the vertical vertex representing the maximum field of view angle; the horizontal direction represents the offset within the meridian range with 0.555μm as the reference, in millimeters (mm). Solid lines represent the meridional plane, and dashed lines represent the sagittal plane. In the distortion diagram, the vertical direction represents the field of view angle, with 0 representing the angle incident parallel to the optical axis, and the vertical vertex representing the maximum field of view angle; the magnitude of the horizontal distortion is expressed as a percentage, without units.

[0086] Figure 8 This is an MTF curve at infinity for a teleconverter lens in this embodiment. Figure 9 This is a near-object distance MTF curve of a teleconverter lens in this embodiment; Reference Figures 8-9 The vertical direction represents the MTF value, i.e., contrast ratio, with 0 indicating no contrast and the vertical vertex representing the maximum contrast ratio, which is unitless; the horizontal direction represents the spatial frequency, with the unit being line pairs per millimeter (lp / mm).

[0087] Example 2

[0088] Similarities to the above embodiments will not be repeated here.

[0089] Table 3. One design value for the magnifying lens in Example 2.

[0090]

[0091] Table 3 shows one design value for the teleconverter lens in Embodiment 2. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The teleconverter lens shown in Table 3 can be... Figure 10 As shown.

[0092] Table 4 Object distance and focus position in Example 2

[0093]

[0094] In Table 4, when the object distance switching position is 1.014mm and the focus position is 15mm, the object distance of the teleconverter is infinity, representing an infinity object distance. In Table 4, when the object distance switching position is 4.449mm and the focus position is 15.800mm, the object distance of the teleconverter is 800mm, representing a close object distance.

[0095] Figures 11-18 You can refer to this. Figures 2-9 Related descriptions.

[0096] Example 3

[0097] Similarities to the above embodiments will not be repeated here.

[0098] Table 5. One design value for the magnifying lens in Example 3.

[0099]

[0100] Table 5 shows one design value for the teleconverter lens in Embodiment 3. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The teleconverter lens shown in Table 5 can be... Figure 19 As shown. In Embodiment 1 and Embodiment 2, the seventh lens 7 and the eighth lens 8 are cemented together, while in Embodiment 3, the seventh lens 7 and the eighth lens 8 are not cemented together.

[0101] Table 6 Object distance and focus position in Example 3

[0102]

[0103] In Table 6, when the object distance switching position is 2.479mm and the focus position is 17.00mm, the object distance of the teleconverter is infinity, representing an infinity object distance. When the object distance switching position is 4.464mm and the focus position is 20.00mm, the object distance of the teleconverter is 800mm, representing a close object distance.

[0104] Figures 20-27 You can refer to this. Figures 2-9 Related descriptions.

[0105] Table 7 Parameter Design Values ​​for Each Embodiment

[0106]

[0107] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A power booster lens characterized by comprising: It includes the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, tenth lens, eleventh lens, twelfth lens and thirteenth lens arranged sequentially along the optical axis from the object side to the image side; satisfy: ; Wherein, the first lens to the ninth lens constitute the front group of the system, and the combined focal length of the front group of the system is... The tenth to thirteenth lenses form the rear group of the system, and the combined focal length of the rear group is [missing value]. ; The optical power of the first lens is positive, the optical power of the second lens is negative, the optical power of the third lens is positive, the optical power of the fourth lens is positive, the optical power of the fifth lens is negative, the optical power of the sixth lens is positive, the optical power of the seventh lens is positive, the optical power of the ninth lens is negative, the optical power of the tenth lens is positive, the optical power of the eleventh lens is positive, the optical power of the twelfth lens is negative, and the optical power of the thirteenth lens is positive.

2. The teleconverter lens according to claim 1, characterized in that, The first lens to the fifth lens form a first group, and the sixth lens to the twelfth lens form a second group; satisfy: ; Wherein, the focal length of the first group is The focal length of the second group is .

3. The teleconverter lens according to claim 2, characterized in that, The first to the fifth lenses form the first group, and the thirteenth lens forms the third group; satisfy: ; The focal length of the third group is... .

4. The teleconverter lens according to claim 1, characterized in that, The first lens to the fifth lens constitute the first group; satisfy: ; Wherein, the focal length of the first lens is The focal length of the first group is .

5. The teleconverter lens according to claim 1, characterized in that, Satisfy: 1.51 <nd1<1.96,1.42<nd9<2.15; The first lens has a refractive index of nd1, and the ninth lens has a refractive index of nd9.

6. The teleconverter lens according to claim 5, characterized in that, Satisfaction: 26.22 <vd2<42.92,56.81<vd4<99.25; The Abbe number of the second lens is vd2, and the Abbe number of the fourth lens is vd4.

7. The teleconverter lens according to claim 1, characterized in that, Satisfaction: 34.03 <nd10×vd10<51.13; The tenth lens has a refractive index of nd10 and an Abbe number of vd10.

8. The teleconverter lens according to claim 1, characterized in that, Satisfaction: 87.30 <nd11×vd11<107.18; The eleventh lens has a refractive index of nd11 and an Abbe number of vd11.

9. The teleconverter lens according to claim 1, characterized in that, Satisfaction: 40.52 <nd12×vd12<58.84; The refractive index of the twelfth lens is nd12, and the Abbe number of the twelfth lens is vd12.

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