TW201809792A - Optical telephoto imaging lens - Google Patents

Abstract

An optical telephoto imaging lens, in order from the object side to the image side: a first lens element with positive refractive power, a second lens element with negative power, a third lens element with refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power. The focal lengths of the first, second...fifth lens elements are f1, f2, f3, f4 and f5, respectively. The radius of curvature of the object surface of the second lens element is R3, the radius of curvature of the image side surface of the second lens element is R4, and they satisfy the relations:|fn| > |f4| > |f2| > |f1|, wherein n=3 and 5; 0 < (R3+R4)/(R3-R4) < 0.5.

Description

Optical telephoto lens

The present invention relates to an optical lens, and more particularly to a miniaturized five-piece optical telephoto lens for use in an electronic product.

In recent years, with the rise of electronic products with photography functions, the demand for optical systems has been increasing. Generally, the photosensitive element of the optical system is nothing more than a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS Sensor), and with the advancement of semiconductor process technology, As the size of the pixel of the photosensitive element is reduced and the optical system is gradually developed in the field of high pixels, the requirements for image quality are increasing, and it is increasingly desirable to have a lens with a telephoto function.

The high-resolution miniaturized photographic lens that is traditionally mounted on electronic devices mainly uses a four-piece lens structure, but because of high-end smart phones, wearable devices, and tablet personal computers (Tablet Personal Computer) The prevalence of high-profile mobile devices such as infrared photographic lenses has driven the demand for pixel and imaging quality of miniaturized camera lenses. The conventional four-piece lens group will not be able to meet higher-order requirements, nor can it be used for telephoto. Shooting.

Conventional cameras, such as mobile phones, tablets, and other wearable electronic devices, such as US7, 436, 600, 2013/0021677, 1015/0131162, etc., have a long-range shooting function, but the architecture is too complicated and huge. It is not suitable for digital mobile devices, while other five-piece small lenses, such as US8,000, 031, US8, 508, 860, and US8, 395, 851 are simple in structure and can be installed in mobile devices, but not for long-range shooting. . Therefore, it is the motivation of the present invention to continuously develop a thin and light short lens with high resolution capability and long-range shooting function.

The object of the present invention is to provide an optical telephoto lens, especially a five-piece optical telephoto lens with light and thin, high resolution and long-range shooting function.

In order to achieve the foregoing objective, an optical telephoto imaging lens according to the present invention includes an aperture and an optical group, the optical group sequentially including from the object side to the image side: a first lens having a positive refractive power, The plastic material has a convex surface on the near-optical axis of the object side surface, a convex surface on the near-optical axis of the image side surface, and an object surface and an image side surface are aspherical surfaces; a second lens has a negative refractive power, And the plastic material has a concave surface at the near-optical axis of the object side surface, and the image side surface has a concave surface at the near-optical axis, and the object side surface and the image side surface are all aspherical surfaces; a third lens has a refractive power, and The plastic material has a concave surface at the near-optical axis of the image side surface, and the object side surface and the image side surface are all aspherical surfaces; a fourth lens has a negative refractive power and is made of a plastic material, and the object side surface is near the optical axis. The concave surface, the object side surface and the image side surface are all aspherical surfaces; a fifth lens has a positive refractive power and is made of a plastic material, and the periphery of the object side surface is a concave surface, and the object side surface and the image side surface thereof All are aspherical;

Wherein the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the focal length of the fifth lens is f5, the second lens The radius of curvature of the object side surface is R3, and the radius of curvature of the image side surface of the second lens is R4, and the following conditions are satisfied:

|fn|>|f4|>|f2|>|f1|, where n=3 and 5; 0 < (R3+R4) / (R3-R4) < 0.5.

When |fn|>|f4|>|f2|>|f1| satisfies the above conditions, the refractive power of each lens can be uniformly arranged, thereby achieving the purpose of long-range shooting, and miniaturizing the lens for loading in a mobile device. .

When (R3+R4) / (R3-R4) satisfies the above conditions, the spherical aberration and astigmatism of the optical telephoto lens are effectively reduced.

Preferably, the second lens has a dispersion coefficient of V2, the third lens has a dispersion coefficient of V3, and the fifth lens has a dispersion coefficient of V5 and satisfies the following conditions: 25 < V3 - V2 < 40; 25 < V3 –V5 < 40. Thereby, the chromatic aberration of the optical telephoto lens is effectively reduced.

Preferably, the distance from the aperture to the image side surface of the fifth lens on the optical axis is SD, and the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis is TD, and The following conditions are satisfied: 0.55 < SD/TD < 0.9. Thereby, the position of the aperture can be properly arranged, the main light entering the electronic photosensitive element can be matched with the electronic photosensitive element, the color shift phenomenon can be reduced, and the contrast of the image surface can be better, and the vignetting can be reduced.

Preferably, the optical focal length imaging lens has an overall focal length of f, the first lens has a focal length of f1, and satisfies the following condition: 0.25 < f1/f < 0.5. Thereby, the refractive power of the first lens is maintained in an appropriate range, and the maximum angle of view (FOV) of the optical telephoto lens is maintained at an appropriate angle while reducing the assembly sensitivity of the first lens.

Preferably, the third lens has a focal length of f3, and the fifth lens has a focal length of f5 and satisfies the following condition: |1/f3| + |1/f5|< 0.35. Thereby, the proper focal length configuration helps to shorten the length of the optical telephoto lens, further achieves the purpose of long-range shooting, and can appropriately control the light beam passing through the optical lens group to reach the imaging region at an appropriate distance.

Preferably, the optical focal length imaging lens has an overall focal length of f, and the object side surface of the fifth lens has a radius of curvature of R9 and satisfies the following condition: |f/R9| < 1. Thereby, the field curvature can be appropriately corrected in accordance with the appropriate aspheric amount, and it is easy to control the ghost image generated by the internal reflection on each surface of the fifth lens.

Preferably, the optical focal length imaging lens has an overall focal length f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, and the following condition is satisfied: 0.75 < TTL / f < 1. Thereby, the purpose of the distant shooting is achieved, and the optical telephoto lens is light and thin, so as to effectively maintain the miniaturization of the optical telephoto lens.

Preferably, the maximum field of view of the optical telephoto lens is FOV and satisfies the following conditions: 30 degrees < FOV < 50 degrees. Thereby, the optical telephoto lens can have an appropriate telephoto field angle.

In addition, in order to achieve the foregoing object, an optical telephoto imaging lens according to the present invention includes an aperture and an optical group, and the optical group includes, in order from the object side to the image side, a first lens having a positive The refractive power is a plastic material, and the object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis, and the object side surface and the image side surface are aspherical surfaces; a second lens has a negative The refractive power is a plastic material, and the object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis, and the object side surface and the image side surface are aspherical surfaces; a third lens has a refractive index The force is a plastic material, and the side surface of the image has a concave surface at the near-optical axis, and the object side surface and the image side surface are aspherical surfaces; a fourth lens has a negative refractive power and is a plastic material, and the object side surface thereof The near-optical axis is a concave surface, and the object side surface and the image side surface are all aspherical surfaces; a fifth lens has a refractive power and is made of a plastic material, and the periphery of the object side surface is a concave surface, and the object side surface and the image thereof The side surfaces are all aspherical;

Wherein the optical focal length imaging lens has an overall focal length of f, the third lens has a focal length of f3, the fifth lens has a focal length of f5, and the fifth lens has an object side surface having a radius of curvature of R9, and the second lens has a dispersion. The coefficient is V2, the dispersion coefficient of the third lens is V3, the dispersion coefficient of the fifth lens is V5, and the following conditions are satisfied:

|1/f3| + |1/f5|< 0.35;|f/R9|< 1;25 < V3–V2 < 40;25 < V3–V5 < 40.

When |1/f3| + |1/f5| satisfies the above conditions, the configuration of the appropriate focal length helps to shorten the length of the optical telephoto lens, and further achieves the purpose of long-range shooting, and can be appropriately controlled. The light beam in the optical lens set reaches the imaging area at an appropriate distance.

When |f/R9|< 1 satisfies the above conditions, the field curvature can be appropriately corrected in accordance with an appropriate aspheric amount, and it is easy to control the ghost image generated by internal reflection on each surface of the fifth lens.

When 25 < V3 - V2 < 40; 25 < V3 - V5 < 40 satisfying the above conditions, the chromatic aberration of the optical telephoto lens is effectively reduced.

Preferably, the distance from the aperture to the image side surface of the fifth lens on the optical axis is SD, and the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis is TD, and The following conditions are satisfied: 0.55 < SD/TD < 0.9. Thereby, the position of the aperture can be properly arranged, the main light entering the electronic photosensitive element can be matched with the electronic photosensitive element, the color shift phenomenon can be reduced, and the contrast of the image surface can be better, and the vignetting can be reduced.

Preferably, the optical focal length imaging lens has an overall focal length of f, the first lens has a focal length of f1, and satisfies the following condition: 0.25 < f1/f < 0.5. Thereby, the refractive power of the first lens is maintained in an appropriate range, and the maximum angle of view (FOV) of the optical telephoto lens is maintained at an appropriate angle while reducing the assembly sensitivity of the first lens.

Preferably, the curvature radius of the object side surface of the first lens is R1, and the radius of curvature of the image side surface of the first lens is R2, and the following condition is satisfied: -0.6 < (R1+R2) / (R1-R2) < -0.35. Thereby, the aberration of the optical telephoto lens is reduced, and the eccentricity is better.

Preferably, the optical focal length imaging lens has an overall focal length of f, and the fourth lens has a focal length of f4 and satisfies the following condition: -2.0 < f4/f < -0.5. Thereby, the refractive power of the fourth lens is maintained in an appropriate range, and the refractive power of the fifth lens is appropriately dispersed to reduce the assembly sensitivity of the fourth lens and the fifth lens.

Preferably, the optical focal length imaging lens has an overall focal length f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, and the following condition is satisfied: 0.75 < TTL / f < 1. Thereby, the purpose of the distant shooting is achieved, and the optical telephoto lens is light and thin, so as to effectively maintain the miniaturization of the optical telephoto lens.

Preferably, the maximum field of view of the optical telephoto lens is FOV and satisfies the following conditions: 30 degrees < FOV < 50 degrees. Thereby, the optical telephoto lens can have an appropriate telephoto field angle.

The present invention has been described with reference to the preferred embodiments of the present invention and the accompanying drawings.

<First Embodiment>

1A and FIG. 1B, FIG. 1A is a schematic diagram of an optical telephoto lens according to a first embodiment of the present invention, and FIG. 1B is a ball from the left to the right of the optical telephoto lens of the first embodiment. Difference, astigmatism and distortion curves. As can be seen from FIG. 1A, the optical telephoto lens includes an aperture 100 and an optical group. The optical group sequentially includes a first lens 110, a second lens 120, a third lens 130, and a fourth lens from the object side to the image side. 140, a fifth lens 150, an infrared filter element 170, and an imaging surface 180, wherein the lens of the optical telephoto lens has a refractive power of five. The aperture 100 is disposed between the first lens 110 and the second lens 120.

The first lens 110 has a positive refractive power and is made of a plastic material. The object side surface 111 is convex at the near optical axis 190, and the image side surface 112 is convex at the near optical axis 190, and the object side surface 111 and the image side are Surface 112 is aspherical.

The second lens 120 has a negative refractive power and is made of a plastic material. The object side surface 121 is a concave surface at the near optical axis 190, and the image side surface 122 is concave at the near optical axis 190, and the object side surface 121 and the image side are Surface 122 is aspherical.

The third lens 130 has a negative refractive power and is made of a plastic material. The object side surface 131 is convex at the near optical axis 190, and the image side surface 132 is concave at the near optical axis 190, and the object side surface 131 and the image side are The surfaces 132 are all aspherical.

The fourth lens 140 has a negative refractive power and is made of a plastic material. The object side surface 141 is concave at the near optical axis 190, and the image side surface 142 is concave at the near optical axis 190, and the object side surface 141 and the image side are Surfaces 142 are all aspherical.

The fifth lens 150 has a positive refractive power and is made of a plastic material. The object side surface 151 is convex at the near optical axis 190, and the image side surface 152 is convex at the near optical axis 190, and the object side surface 151 and the image side are The surface 152 is aspherical. In this embodiment, the periphery of the object side surface 151 of the fifth lens 150 is concave, that is, the object side surface 151 of the fifth lens 150 is present from the near optical axis 190 to the periphery. The change in the convex to concave surface.

The infrared filter element 170 is made of glass and disposed between the fifth lens 150 and the imaging surface 180 without affecting the focal length of the optical telephoto lens.

The aspherical curve equations of the above lenses are expressed as follows:

Where z is the position value with reference to the surface apex at a position of height h in the direction of the optical axis 190; c is the curvature of the lens surface near the optical axis 190, and is the reciprocal of the radius of curvature (R) (c = 1/R) R is the radius of curvature of the lens surface near the optical axis 190, h is the vertical distance of the lens surface from the optical axis 190, k is a conic constant, and A ₄ , A ₆ , A ₈ , A ₁₀ , A ₁₂ , A ₁₄ is an aspheric coefficient of four, six, eight, ten, twelve, and fourteenth steps, respectively.

In the optical telephoto lens of the first embodiment, the focal length of the optical telephoto lens is f, the aperture value (f-number) of the optical telephoto lens is Fno, and the maximum angle of view of the optical telephoto lens is half. For HFOV, the values are as follows: f = 6.56 (mm); Fno = 2.65; and HFOV = 21.76 (degrees).

In the optical telephoto lens of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the focal length of the fourth lens 140 is F4, the focal length of the fifth lens 150 is f5, and satisfies the following condition: |fn|>|f4|>|f2|>|f1|, where n=3 and 5, and |f1|=2.38,|f2| =2.88,|f3|=39.36,|f4|=5.68,|f5|=12.91.

In the optical telephoto lens of the first embodiment, the object side surface 121 of the second lens 120 has a radius of curvature R3, and the image side surface 122 of the second lens 120 has a radius of curvature of R4 and satisfies the following conditions: (R3+ R4) / (R3-R4) = 0.27.

In the optical telephoto lens of the first embodiment, the second lens 120 has a dispersion coefficient of V2, the third lens 130 has a dispersion coefficient of V3, and the fifth lens 150 has a dispersion coefficient of V5, and satisfies the following conditions: V3–V2 = 32.0; V3–V5 = 34.

In the optical telephoto lens of the first embodiment, the distance from the image side surface 152 of the aperture 100 to the fifth lens 150 to the optical axis 190 is SD, and the object side surface 111 of the first lens 110 to the fifth lens The image side surface 152 of 150 has a distance TD on the optical axis 190 and satisfies the following condition: SD/TD = 0.74.

In the optical telephoto lens of the first embodiment, the overall focal length of the optical telephoto lens is f, the focal length of the first lens 110 is f1, and the following condition is satisfied: f1/f = 0.36.

In the optical telephoto lens of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fifth lens 150 is f5, and the following conditions are satisfied: |1/f3| + |1/f5|=0.10 .

In the optical telephoto lens of the first embodiment, the optical focal length imaging lens has an overall focal length of f, and the object side surface 151 of the fifth lens 150 has a radius of curvature of R9 and satisfies the following condition: |f/R9| 0.21.

In the optical telephoto lens of the first embodiment, the overall focal length of the optical telephoto lens is f, and the distance from the object side surface 111 of the first lens 110 to the imaging surface 180 on the optical axis 190 is TTL and satisfies The following conditions are: TTL/ f =0.88.

In the optical telephoto lens of the first embodiment, the object side surface 111 of the first lens 110 has a radius of curvature R1, and the image side surface 112 of the first lens 110 has a radius of curvature R2 and satisfies the following conditions: (R1 +R2) / (R1-R2) = -0.49.

In the optical telephoto lens of the first embodiment, wherein the optical focal length imaging lens has an overall focal length of f, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f4/f = -0.87.

Refer to Table 1 and Table 2 below for reference.

Table 1 is the detailed structural data of the first embodiment of Fig. 1A, in which the unit of curvature radius, thickness and focal length is mm, and the surface 0-14 sequentially represents the surface from the object side to the image side. Table 2 shows the aspherical surface data in the first embodiment, in which the cone surface coefficient in the a-spherical curve equation of k, and A4-A16 represents the 4-16th-order aspherical coefficient of each surface. In addition, the table of the following embodiments corresponds to the schematic diagram and the aberration diagram of each embodiment, and the definition of the data in the table is the same as the definitions of Table 1 and Table 2 of the first embodiment, and details are not described herein.

<Second embodiment>

Please refer to FIG. 2A and FIG. 2B , wherein FIG. 2A is a schematic diagram of an optical telephoto lens according to a second embodiment of the present invention, and FIG. 2B is a ball of the optical telephoto lens of the second embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 2A, the optical telephoto lens includes an aperture 200 and an optical group. The optical group sequentially includes a first lens 210, a second lens 220, a third lens 230, and a fourth lens from the object side to the image side. 240, a fifth lens 250, an infrared filter element 270, and an imaging surface 280, wherein the lens of the optical telephoto lens has a refractive power of five. The aperture 200 is disposed between the second lens 220 and the third lens 230.

The first lens 210 has a positive refractive power and is made of a plastic material. The object side surface 211 is convex at the near optical axis 290, and the image side surface 212 is convex at the near optical axis 290, and the object side surface 211 and the image side are Surface 212 is aspherical.

The second lens 220 has a negative refractive power and is made of a plastic material. The object side surface 221 is concave at the near optical axis 290, and the image side surface 222 is concave at the near optical axis 290, and the object side surface 221 and the image side are Surfaces 222 are all aspherical.

The third lens 230 has a positive refractive power and is made of a plastic material. The object side surface 231 is convex at the near optical axis 290, and the image side surface 232 is concave at the near optical axis 290, and the object side surface 231 and the image side are Surfaces 232 are all aspherical.

The fourth lens 240 has a negative refractive power and is made of a plastic material. The object side surface 241 is concave at the near optical axis 290, and the image side surface 242 is concave at the near optical axis 290, and the object side surface 241 and the image side are Surface 242 is aspherical.

The fifth lens 250 has a positive refractive power and is made of a plastic material. The object side surface 251 is convex at the near optical axis 290, and the image side surface 252 is concave at the near optical axis 290, and the object side surface 251 and the image side are The surface 252 is aspherical. In this embodiment, the periphery of the object side surface 251 of the fifth lens 250 is concave, that is, the object side surface 251 of the fifth lens 250 is present from the near optical axis 290 to the periphery. The change in the convex to concave surface.

The infrared filter element 270 is made of glass and disposed between the fifth lens 250 and the imaging surface 280 without affecting the focal length of the optical imaging lens.

Refer to Table 3 and Table 4 below.

In the second embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 3 and Table 4, the following data can be derived:

<Third embodiment>

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of an optical telephoto lens according to a third embodiment of the present invention, and FIG. 3B is a ball of the optical telephoto lens of the third embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 3A, the optical telephoto lens includes an aperture 300 and an optical group. The optical group sequentially includes a first lens 310, a second lens 320, a third lens 330, and a fourth lens from the object side to the image side. 340. The fifth lens 350, the infrared filter element 370, and the imaging surface 380, wherein the lens of the optical telephoto lens has a refractive power of five. The aperture 300 is disposed between the second lens 320 and the third lens 330.

The first lens 310 has a positive refractive power and is made of a plastic material. The object side surface 311 is convex at the near optical axis 390, and the image side surface 312 is convex at the near optical axis 390, and the object side surface 311 and the image side are Surfaces 312 are all aspherical.

The second lens 320 has a negative refractive power and is made of a plastic material. The object side surface 321 is concave at the near optical axis 390, and the image side surface 322 is concave at the near optical axis 390, and the object side surface 321 and the image side are Surfaces 322 are all aspherical.

The third lens 330 has a negative refractive power and is made of a plastic material. The object side surface 331 is convex at the near optical axis 390, and the image side surface 332 is concave at the near optical axis 390, and the object side surface 331 and the image side are Surface 332 is aspherical.

The fourth lens 340 has a negative refractive power and is made of a plastic material, and the object side surface 341 is concave at the near optical axis 390, and the image side surface 342 is convex at the near optical axis 390, and the object side surface 341 and the image side are Surfaces 342 are all aspherical.

The fifth lens 350 has a positive refractive power and is made of a plastic material. The object side surface 351 is convex at the near optical axis 390, and the image side surface 352 is concave at the near optical axis 390, and the object side surface 351 and the image side are The surface 352 is aspherical. In this embodiment, the periphery of the object-side surface 351 of the fifth lens 350 is concave, that is, the object side surface 351 of the fifth lens 350 is present from the near-optical axis 390 to the periphery. The change in the convex to concave surface.

The infrared filter element 370 is made of glass and disposed between the fifth lens 350 and the imaging surface 380 without affecting the focal length of the optical telephoto lens.

Refer to Table 5 and Table 6 below for reference.

In the third embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 5 and Table 6, the following data can be derived:

<Fourth embodiment>

Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic diagram of an optical telephoto lens according to a fourth embodiment of the present invention, and FIG. 4B is a ball of the optical telephoto lens of the fourth embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 4A, the optical telephoto lens includes an aperture 400 and an optical group. The optical group sequentially includes a first lens 410, a second lens 420, a third lens 430, and a fourth lens from the object side to the image side. 440, a fifth lens 450, an infrared filter element 470, and an imaging surface 480, wherein the lens having a refractive power in the optical telephoto lens is five pieces. The aperture 400 is disposed between the second lens 420 and the third lens 430.

The first lens 410 has a positive refractive power and is made of a plastic material. The object side surface 411 is convex at the near optical axis 490, and the image side surface 412 is convex at the near optical axis 490, and the object side surface 411 and the image side are Surface 412 is aspherical.

The second lens 420 has a negative refractive power and is made of a plastic material. The object side surface 421 is concave at the near optical axis 490, and the image side surface 422 is concave at the near optical axis 490, and the object side surface 421 and the image side are Surface 422 is aspherical.

The third lens 430 has a negative refractive power and is made of a plastic material. The object side surface 431 is convex at the near optical axis 490, and the image side surface 432 is concave at the near optical axis 490, and the object side surface 431 and the image side are Surface 432 is aspherical.

The fourth lens 440 has a negative refractive power and is made of a plastic material. The object side surface 441 is concave at the near optical axis 490, and the image side surface 442 is convex at the near optical axis 490, and the object side surface 441 and the image side are Surface 442 is aspherical.

The fifth lens 450 has a positive refractive power and is made of a plastic material. The object side surface 451 is concave at the near optical axis 490, and the image side surface 452 is convex at the near optical axis 490, and the object side surface 451 and the image side are The surface 452 is aspherical. In the embodiment, the periphery of the object side surface 451 of the fifth lens 450 is also a concave surface.

The infrared filter element 470 is made of glass and disposed between the fifth lens 450 and the imaging surface 480 without affecting the focal length of the optical telephoto lens.

Refer to Table 7 and Table 8 below for reference.

In the fourth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 7 and Table 8:

<Fifth Embodiment>

5A and 5B, wherein FIG. 5A is a schematic diagram of an optical telephoto lens according to a fifth embodiment of the present invention, and FIG. 5B is a ball of the optical telephoto lens of the fifth embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 5A, the optical telephoto lens includes an aperture 500 and an optical group. The optical group sequentially includes a first lens 510, a second lens 520, a third lens 530, and a fourth lens from the object side to the image side. 540. The fifth lens 550, the infrared filter element 570, and the imaging surface 580, wherein the lens having the refractive power in the optical telephoto lens is five pieces. The aperture 500 is disposed between the second lens 520 and the third lens 530.

The first lens 510 has a positive refractive power and is made of a plastic material. The object side surface 511 is convex at the near optical axis 590, and the image side surface 512 is convex at the near optical axis 590, and the object side surface 511 and the image side are Surface 512 is aspherical.

The second lens 520 has a negative refractive power and is made of a plastic material. The object side surface 521 is concave at the near optical axis 590, and the image side surface 522 is concave at the near optical axis 590, and the object side surface 521 and the image side are Surface 522 is aspherical.

The third lens 530 has a negative refractive power and is made of a plastic material. The object side surface 531 is convex at the near optical axis 590, and the image side surface 532 is concave at the near optical axis 590, and the object side surface 531 and the image side are Surface 532 is aspherical.

The fourth lens 540 has a negative refractive power and is made of a plastic material. The object side surface 541 is concave at the near optical axis 590, and the image side surface 542 is concave at the near optical axis 590, and the object side surface 541 and the image side are Surface 542 is aspherical.

The fifth lens 550 has a positive refractive power and is made of a plastic material. The object side surface 551 is concave at the near optical axis 590, and the image side surface 552 is convex at the near optical axis 590, and the object side surface 551 and the image side are The surface 552 is aspherical. In the embodiment, the periphery of the object side surface 551 of the fifth lens 550 is also a concave surface.

The infrared filter element 570 is made of glass and disposed between the fifth lens 550 and the imaging surface 580 without affecting the focal length of the optical telephoto lens.

Refer to Table 9 and Table 10 below.

In the fifth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 9 and Table 10:

<Sixth embodiment>

6A and 6B, wherein FIG. 6A is a schematic diagram of an optical telephoto lens according to a sixth embodiment of the present invention, and FIG. 6B is a ball of the optical telephoto lens of the sixth embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 6A, the optical telephoto lens includes an aperture 600 and an optical group. The optical group includes a first lens 610, a second lens 620, a third lens 630, and a fourth lens from the object side to the image side. 640, a fifth lens 650, an infrared filter element 670, and an imaging surface 680, wherein the lens having a refractive power in the optical telephoto lens is five. The aperture 600 is disposed between the second lens 620 and the third lens 630.

The first lens 610 has a positive refractive power and is made of a plastic material. The object side surface 611 is convex at the near optical axis 690, and the image side surface 612 is convex at the near optical axis 690, and the object side surface 611 and the image side are Surface 612 is aspherical.

The second lens 620 has a negative refractive power and is made of a plastic material. The object side surface 621 is concave at the near optical axis 690, and the image side surface 622 is concave at the near optical axis 690, and the object side surface 621 and the image side are Surface 622 is aspherical.

The third lens 630 has a negative refractive power and is made of a plastic material. The object side surface 631 is concave at the near optical axis 690, and the image side surface 632 is concave at the near optical axis 690, and the object side surface 631 and the image side are Surface 632 is aspherical.

The fourth lens 640 has a negative refractive power and is made of a plastic material. The object side surface 641 is concave at the near optical axis 690, and the image side surface 642 is concave at the near optical axis 690, and the object side surface 641 and the image side are Surface 642 is aspherical.

The fifth lens 650 has a positive refractive power and is made of a plastic material. The object side surface 651 is concave at the near optical axis 690, and the image side surface 652 is convex at the near optical axis 690, and the object side surface 651 and the image side are The surface 652 is aspherical. In the embodiment, the periphery of the object side surface 651 of the fifth lens 650 is also a concave surface.

The infrared filter element 670 is made of glass and disposed between the fifth lens 650 and the imaging surface 680 without affecting the focal length of the optical telephoto lens.

Referring again to Table 11 and Table 12 below.

In the sixth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 11 and Table 12:

<Seventh embodiment>

Please refer to FIG. 7A and FIG. 7B , wherein FIG. 7A is a schematic diagram of an optical telephoto lens according to a seventh embodiment of the present invention, and FIG. 7B is a ball of the optical telephoto lens of the seventh embodiment from left to right. Difference, astigmatism and distortion curves. As can be seen from FIG. 7A, the optical telephoto lens includes an aperture 700 and an optical group. The optical group includes a first lens 710, a second lens 720, a third lens 730, and a fourth lens from the object side to the image side. 740, a fifth lens 750, an infrared filter element 770, and an imaging surface 780, wherein the lens having a refractive power in the optical telephoto lens is five. The aperture 700 is disposed between the second lens 720 and the third lens 730.

The first lens 710 has a positive refractive power and is made of a plastic material. The object side surface 711 is convex at the near optical axis 790, and the image side surface 712 is convex at the near optical axis 790, and the object side surface 711 and the image side are Surface 712 is aspherical.

The second lens 720 has a negative refractive power and is made of a plastic material. The object side surface 721 is concave at the near optical axis 790, and the image side surface 722 is concave at the near optical axis 790, and the object side surface 721 and the image side are Surface 722 is aspherical.

The third lens 730 has a negative refractive power and is made of a plastic material. The object side surface 731 is concave at the near optical axis 790, and the image side surface 732 is concave at the near optical axis 790, and the object side surface 731 and the image side are Surface 732 is aspherical.

The fourth lens 740 has a negative refractive power and is made of a plastic material. The object side surface 741 is concave at the near optical axis 790, and the image side surface 742 is concave at the near optical axis 790, and the object side surface 741 and the image side are Surface 742 is aspherical.

The fifth lens 750 has a positive refractive power and is made of a plastic material. The object side surface 751 is convex at the near optical axis 790, and the image side surface 752 is convex at the near optical axis 790, and the object side surface 751 and the image side are The surface 752 is aspherical. In this embodiment, the periphery of the object side surface 751 of the fifth lens 750 is concave, that is, the fifth lens 750 object side surface 751 is present from the near optical axis 790 to the periphery. The change in the convex to concave surface.

The infrared filter element 770 is made of glass and disposed between the fifth lens 750 and the imaging surface 780 without affecting the focal length of the optical imaging lens.

Refer to Table 13 and Table 14 below.

In the seventh embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 13 and Table 14:

<Eighth Embodiment>

8A and FIG. 8B, FIG. 8A is a schematic diagram of an optical telephoto lens according to an eighth embodiment of the present invention, and FIG. 8B is a ball from the left to the right of the optical telephoto lens of the eighth embodiment. Difference, astigmatism and distortion curves. As shown in FIG. 8A, the optical telephoto lens includes an aperture 800 and an optical group. The optical group sequentially includes a first lens 810, a second lens 820, a third lens 830, and a fourth lens from the object side to the image side. 840, a fifth lens 850, an infrared filter element 870, and an imaging surface 880, wherein the lens of the optical telephoto lens has a refractive power of five. The aperture 800 is disposed between the second lens 820 and the third lens 830.

The first lens 810 has a positive refractive power and is made of a plastic material. The object side surface 811 is convex at the near optical axis 890, and the image side surface 812 is convex at the near optical axis 890, and the object side surface 811 and the image side are Surface 812 is aspherical.

The second lens 820 has a negative refractive power and is made of a plastic material. The object side surface 821 is concave at the near optical axis 890, and the image side surface 822 is concave at the near optical axis 890, and the object side surface 821 and the image side are Surface 822 is aspherical.

The third lens 830 has a negative refractive power and is made of a plastic material. The object side surface 831 is convex at the near optical axis 890, and the image side surface 832 is concave at the near optical axis 890, and the object side surface 831 and the image side are Surface 832 is aspherical.

The fourth lens 840 has a negative refractive power and is made of a plastic material. The object side surface 841 is concave at the near optical axis 890, and the image side surface 842 is concave at the near optical axis 890, and the object side surface 841 and the image side are Surface 842 is aspherical.

The fifth lens 850 has a positive refractive power and is made of a plastic material. The object side surface 851 is convex at the near optical axis 890, and the image side surface 852 is concave at the near optical axis 890, and the object side surface 851 and the image side are The surface 852 is aspherical. In this embodiment, the periphery of the object side surface 851 of the fifth lens 850 is concave, that is, the object side surface 851 of the fifth lens 850 is present from the near optical axis 890 to the periphery. The change in the convex to concave surface.

The infrared filter element 870 is made of glass and disposed between the fifth lens 850 and the imaging surface 880 without affecting the focal length of the optical telephoto lens.

Refer to Table 15 and Table 16 below for reference.

In the eighth embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

The following data can be derived from Table 15 and Table 16:

The optical telephoto lens provided by the invention can be made of plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens is made of glass, the refractive power of the optical telephoto lens can be increased. The degree of freedom. In addition, the object side surface and the image side surface of the lens in the optical telephoto lens may be aspherical, and the aspheric surface can be easily formed into a shape other than the spherical surface, and more control variables are obtained to reduce the aberration and thereby reduce the lens use. The number of the optical telephoto lens of the present invention can be effectively reduced.

In the optical telephoto lens provided by the present invention, in the case of a lens having a refractive power, if the surface of the lens is convex and the position of the convex surface is not defined, it indicates that the surface of the lens is convex at the near optical axis; When the surface is concave and the concave position is not defined, it indicates that the lens surface is concave at the near optical axis.

The optical telephoto lens provided by the invention is more suitable for the optical system of moving focus, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (3D) image capturing and digital cameras in various aspects. In electronic imaging systems such as mobile devices, digital tablets or car photography.

In the above, the above embodiments and drawings are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention are all It should be within the scope of the patent of the present invention.

100, 200, 300, 400, 500, 600, 700, 800‧ ‧ aperture

110, 210, 310, 410, 510, 610, 710, 810 ‧ ‧ first lens

111, 211, 311, 411, 511, 611, 711, 811 ‧ ‧ ‧ side surface

112, 212, 312, 412, 512, 612, 712, 812‧‧‧ image side surface

120, 220, 320, 420, 520, 620, 720, 820‧‧‧ second lens

121, 221, 321, 421, 521, 621, 721, 821‧‧ ‧ side surfaces

122, 222, 322, 422, 522, 622, 722, 822 ‧ ‧ side surface

130, 230, 330, 430, 530, 630, 730, 830 ‧ ‧ third lens

131, 231, 331, 431, 531, 631, 731, 831 ‧ ‧ ‧ side surface

132, 232, 332, 432, 532, 632, 732, 832‧‧‧ side surface

140, 240, 340, 440, 540, 640, 740, 840 ‧ ‧ fourth lens

141, 241, 341, 441, 541, 641, 741, 841‧‧‧ ‧ side surfaces

142, 242, 342, 442, 542, 642, 742, 842 ‧ ‧ side surface

150, 250, 350, 450, 550, 650, 750, 850 ‧ ‧ fifth lens

151, 251, 351, 451, 551, 651, 751, 851 ‧ ‧ ‧ side surface

152, 252, 352, 452, 552, 652, 752, 852 ‧ ‧ side surface

170, 270, 370, 470, 570, 670, 770, 870 ‧ ‧ infrared filter components

180, 280, 380, 480, 580, 680, 780, 880 ‧ ‧ imaging surface

190, 290, 390, 490, 590, 690, 790, 890‧‧‧ optical axis

f‧‧‧The focal length of the optical telephoto lens

Fno‧‧‧Aperture value of optical telephoto lens

Half of the maximum field of view in the HFOV‧‧ optical imaging lens

Maximum viewing angle in FOV‧‧‧ optical telephoto lens

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

f3‧‧‧The focal length of the third lens

F4‧‧‧The focal length of the fourth lens

f5‧‧‧Focus of the fifth lens

R1‧‧‧ radius of curvature of the object side surface of the first lens

R2‧‧‧ Image side surface radius of curvature of the first lens

R3‧‧‧ radius of curvature of the object side surface of the second lens

R4‧‧‧ Image side surface radius of curvature of the second lens

Radius radius of the object side surface of R9‧‧‧ fifth lens

V2‧‧‧Dispersion coefficient of the second lens

V3‧‧‧Dispersion coefficient of the third lens

Dispersion coefficient of V5‧‧‧ fifth lens

TD‧‧‧distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis

Distance from SD‧‧‧ aperture to the image side surface of the fifth lens on the optical axis

TTL‧‧‧The distance from the object side surface of the first lens to the imaging surface on the optical axis

1A is a schematic view of an optical telephoto lens of a first embodiment of the present invention. 1B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the first embodiment, from left to right. 2A is a schematic view of an optical telephoto lens of a second embodiment of the present invention. 2B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the second embodiment, from left to right. Fig. 3A is a schematic view showing an optical telephoto lens of a third embodiment of the present invention. FIG. 3B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the third embodiment, from left to right. 4A is a schematic view of an optical telephoto lens of a fourth embodiment of the present invention. 4B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the fourth embodiment, from left to right. Fig. 5A is a schematic view showing an optical telephoto lens of a fifth embodiment of the present invention. FIG. 5B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the fifth embodiment, from left to right. Fig. 6A is a schematic view showing an optical telephoto lens of a sixth embodiment of the present invention. 6B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the sixth embodiment, from left to right. Fig. 7A is a schematic view showing an optical telephoto lens of a seventh embodiment of the present invention. 7B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the seventh embodiment, from left to right. Fig. 8A is a schematic view showing an optical telephoto lens of an eighth embodiment of the present invention. FIG. 8B is a spherical aberration, astigmatism, and distortion curve of the optical telephoto lens of the eighth embodiment from left to right.

Claims (15)

An optical telephoto lens includes an aperture and an optical group. The optical group is sequentially included from the object side to the image side: a first lens having a positive refractive power and a plastic material, and the object side surface is low beam The shaft is convex, and the image side surface is convex at the near optical axis, and the object side surface and the image side surface are all aspherical surfaces; a second lens has a negative refractive power and is made of a plastic material, and the object side surface is low beam The shaft is concave, and the image side surface is concave at the near-optical axis, and the object side surface and the image side surface are all aspherical surfaces; a third lens has a refractive power and is made of a plastic material, and the image side surface is near the optical axis. The concave surface, the object side surface and the image side surface are all aspherical surfaces; a fourth lens has a negative refractive power and is made of a plastic material, and the object side surface is concave at the near optical axis, and the object side surface and the image side thereof The surface of the fifth lens has a positive refractive power and is made of a plastic material. The periphery of the object side surface is a concave surface, and the object side surface and the image side surface are aspherical surfaces; wherein the first lens The focal length is f1, and the focal length of the second lens is f2 The focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the radius of curvature of the object side surface of the second lens is R3, and the curvature of the image side surface of the second lens The radius is R4 and the following conditions are met: |fn|>|f4|>|f2|>|f1|, where n=3 and 5; 0 < (R3+R4) / (R3-R4) < 0.5. The optical telephoto lens of claim 1, wherein the second lens has a dispersion coefficient of V2, the third lens has a dispersion coefficient of V3, and the fifth lens has a dispersion coefficient of V5, and satisfies the following conditions: 25 < V3–V2 < 40; 25 < V3–V5 < 40. The optical telephoto imaging lens according to claim 1, wherein the distance from the aperture to the image side surface of the fifth lens on the optical axis is SD, and the object side surface of the first lens to the image side surface of the fifth lens The distance on the optical axis is TD and the following conditions are met: 0.55 < SD/TD < 0.9. The optical telephoto lens of claim 1, wherein the optical focal length imaging lens has an overall focal length of f, the first lens has a focal length of f1, and satisfies the following condition: 0.25 < f1/f < 0.5. The optical telephoto lens of claim 1, wherein the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following condition is satisfied: |1/f3| + |1/f5|< 0.35 . The optical telephoto imaging lens according to claim 5, wherein an overall focal length of the optical telephoto lens is f, and an object side surface curvature radius of the fifth lens is R9, and the following condition is satisfied: |f/R9| 1. The optical telephoto lens according to claim 1, wherein the optical focal length imaging lens has an overall focal length of f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, and the following conditions are satisfied. : 0.75 < TTL/ f < 1. The optical telephoto lens of claim 7, wherein the optical field imaging lens has a maximum angle of view of FOV and is full of the following conditions: 30 degrees < FOV < 50 degrees. An optical telephoto lens includes an aperture and an optical group. The optical group is sequentially included from the object side to the image side: a first lens having a positive refractive power and a plastic material, and the object side surface is low beam The shaft is convex, and the image side surface is convex at the near optical axis, and the object side surface and the image side surface are all aspherical surfaces; a second lens has a negative refractive power and is made of a plastic material, and the object side surface is low beam The shaft is concave, and the image side surface is concave at the near-optical axis, and the object side surface and the image side surface are all aspherical surfaces; a third lens has a refractive power and is made of a plastic material, and the image side surface is near the optical axis. The concave surface, the object side surface and the image side surface are all aspherical surfaces; a fourth lens has a negative refractive power and is made of a plastic material, and the object side surface is concave at the near optical axis, and the object side surface and the image side thereof The surface is aspherical; a fifth lens has a refractive power and is made of a plastic material, and the periphery of the object side surface is a concave surface, and the object side surface and the image side surface are aspherical surfaces; wherein the optical telephoto lens is The overall focal length is f, the third lens The focal length of the fifth lens is f5, the focal length of the object side surface of the fifth lens is R9, the dispersion coefficient of the second lens is V2, and the dispersion coefficient of the third lens is V3, the fifth The lens has a dispersion coefficient of V5 and satisfies the following conditions: |1/f3| + |1/f5|< 0.35; |f/R9|< 1; 25 < V3–V2 < 40; 25 < V3–V5 < 40. The optical telephoto imaging lens according to claim 9, wherein the distance from the aperture to the image side surface of the fifth lens on the optical axis is SD, and the object side surface of the first lens to the image side surface of the fifth lens The distance on the optical axis is TD and the following conditions are met: 0.55 < SD/TD < 0.9. The optical telephoto lens of claim 9, wherein the optical focal length imaging lens has an overall focal length of f, the first lens has a focal length of f1, and satisfies the following condition: 0.25 < f1/f < 0.5. The optical telephoto lens of claim 11, wherein the object side surface has a radius of curvature R1, the image side surface of the first lens has a radius of curvature of R2, and satisfies the following condition: -0.6 < (R1 +R2) / (R1-R2) < -0.35. The optical telephoto lens of claim 9, wherein the optical focal length imaging lens has an overall focal length of f, the fourth lens has a focal length of f4, and satisfies the following condition: -2.0 < f4/f < -0.5. The optical telephoto imaging lens according to claim 9, wherein the optical focal length imaging lens has an overall focal length of f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, and the following conditions are satisfied. : 0.75 < TTL/ f < 1. The optical telephoto lens of claim 14, wherein the optical field imaging lens has a maximum angle of view of FOV and is full of the following conditions: 30 degrees < FOV < 50 degrees.