TW201346373A - Image pick-up lens with five-piece structure and image pick-up device - Google Patents

Abstract

The present invention discloses an image pick-up lens with five-piece structure and an image pick-up device using the same. The image pick-up lens comprises, in order from an object side to an image side thereof: a first lens with a positive refractive power comprising convex surfaces facing the object side and the image side, respectively; a second lens with a negative refractive power comprising a convex surface facing the object side and a concave surface facing the image side; a third lens with a positive refractive power comprising convex surfaces facing the object side and the image side, respectively; a fourth lens with a positive refractive power comprising a concave surface facing the object side and a convex surface facing the image side; and a fifth lens with a negative refractive power comprising both of an object-side surface and an image-side surface being aspherical surfaces, each having at least one inflection point. The near-axis region of the object-side surface of the fifth lens is a convex surface; the near-axis region of the image-side surface of the fifth lens is a concave surface. The image pickup lens satisfies specific conditions. Therefore, an image pickup lens with shorter total-length and wider field view angle is provided.

Description

Five-lens optical imaging lens and camera device thereof

The present invention relates to an optical imaging lens and an imaging device thereof, and more particularly to an optical imaging lens having a short length and a wide viewing angle, which is composed of five lenses, and an imaging device thereof, for a small electronic device.

With the advancement of technology, electronic products are constantly moving towards light, short, and versatile, such as digital still cameras, PC cameras, network cameras, and mobile phones. Telephones (mobile phones) and the like are often equipped with an imaging device (lens), and even portable electronic devices such as personal digital assistants (PDAs) have the need for an image capturing device (lens). In the improvement of the current image capturing device, in order to carry the image capturing device, the operator not only needs to have good image quality, but also needs to consider how to reduce the volume (length) and cost.

In the conventional technology, the image taking lens for small electronic products has two different designs of two lens type, three lens type, four lens type and five lens type, but in terms of imaging quality, the multi-lens optical lens is Aberration correction, optical transfer function MTF (modulation transfer function) performance is more advantageous, can be used for high pixel (pixel) requirements of electronic products. In order to improve the five-lens optical imaging lens, such as reducing the length of the system, increasing the aberration correction effect, reducing the manufacturing cost, etc., the difference or technical feature between the structural design of the conventional five-lens optical imaging lens, It is often determined by changes or combinations of various factors: the shape of the corresponding fit between the five lenses is different, such as different shapes such as meniscus shape, bi-convex, and bi-concave. The lens, in order to achieve different positive or negative refractive power effects; or the convex/concave direction of the corresponding fit between the five lenses to adjust the angle of incidence and exit of the light; or the corresponding diopter between the five lenses ( Positive/negative combination is different to properly distribute the beam to reduce ghosting; or to propose relevant optical data between the five lenses with the best range, such as fs (effective focal length of the image lens system), di (between optical surfaces) Distance), Ri (radius of curvature of each optical surface i), etc., to improve imaging quality, adjust system length or other special functions and purposes by satisfying different conditions, respectively. For example, Japanese Patent No. JPA2007-298572, JPA2010-152042, JPA 2010-107606, JPA 2009-294527, JPA 2000-241701, US Patent US2010254029, US8035723, World Patent WO2011129319, Chinese Patent CN102317834, CN102047165, CN101819315, and the like. In many cases, it is proposed that the image side optical surface of the fifth lens of the image capturing device has at least one inflection point, so that the near optical axis of the image side optical surface of the fifth lens is concave, and the convex surface is turned toward the lens edge. To shorten the lens length and correct the aberrations.

As can be seen from the above, in terms of the design of the five-lens optical imaging lens, the prior art is in the field of designing optical imaging lens technology, and is applied to various optical purposes for different changes or combinations. It can be considered novelty or inactive step by using different lens shapes, combinations, effects or effects.

In recent years, it has been used in high-end compact cameras, photo phones, PDAs, etc., and has a short mirror length, good aberration correction, and high-definition and low-cost imaging lenses, which are urgently needed by users. However, in the optical imaging lens disclosed in the prior art, the lens length should be further reduced, and the viewing angle can be further increased. In order to effectively reduce the length of the system and improve the viewing angle, the present invention proposes a more practical design for use in portable electronic products such as high-end compact cameras and photo phones.

The main object of the present invention is to provide a five-lens optical imaging lens suitable for use in various electronic devices, and the surface structure and optical parameters of each lens of the five-lens optical imaging lens proposed by the present invention are optimized. The combination of ranges can effectively shorten the length of the system and increase the angle of view of the lens while maintaining high image quality, providing a small (thin) portable device (such as a mobile phone) that needs to be equipped with high-end imaging quality. Further, an image pickup apparatus including the five-lens optical pickup lens of the present invention has been proposed, thereby providing a compact and high-performance image pickup apparatus.

According to an object of the present invention, a five-lens optical imaging lens is provided, which is arranged along the optical axis from the object side to the image side in sequence: a first lens, an aperture stop, a second lens, a third lens, and a fourth Lens and fifth lens. The first lens has a positive refracting power, and both the object side optical surface and the image side optical surface are convex. The second lens has a negative refracting power with a convex surface facing the object side and a concave surface facing the image side. The third lens has a positive refracting power, and both the object side optical surface and the image side optical surface are convex. The fourth lens has a positive refracting power with a concave surface facing the object side and a convex surface facing the image side. The fifth lens has a negative refracting power, and the object side optical surface and the image side optical surface are both aspherical and respectively have at least one inflection point, and the object side optical surface has a convex surface at a paraxial shape, and the image side optical surface has a paraxial shape. The area is concave. The five-lens optical image taking lens of the present invention satisfies at least the following conditions of the formulas (1) to (3):

85°≧2ω≧60° ......(1)

Wherein L ₃ R ₁ is the radius of curvature of the object side optical surface of the third lens; L ₃ R ₂ is the radius of curvature of the image side optical surface of the third lens; L ₄ R ₁ is the object side optical surface of the fourth lens Curvature radius; Nd ₃ is the refractive index of the third lens; Nd ₄ is the refractive index of the fourth lens; D ₇ is the distance from the image side optical surface of the third lens on the optical axis to the object side optical surface of the fourth lens; 2ω To capture the maximum field angle of the lens.

With the above-described lens surface structure and formula (1), the maximum field angle of view of the image taking lens of the present invention is limited, so that good image quality is still obtained under the condition of reducing the overall length of the system. Wherein, when 2ω is lower than 60°, the field angle of view of the lens will be narrowed while the focal length of the system becomes longer, resulting in an increase in the overall length of the system and not suitable for small (thin) electronic devices; and when 2ω is higher than 85° At the time, the field angle of view of the lens will become too wide to compensate for astigmatism and distortion.

By the formula (2), the focal length of the air lens formed between the third lens and the fourth lens can be appropriately restricted, thereby improving the correction of the image plane and the condition of lens workability. Since in the negative focal length, the larger the value is, the larger the divergence and tortuosity is, and when the value of the formula (2) is -6 or more, since the air lens formed between the third lens and the fourth lens can maintain sufficient negative refraction. The force, while the Petzval sum of the control system is too large to maintain the flatness of the image plane. On the other hand, when the value of the formula (2) is less than or equal to -3.8, the negative refractive power of the air lens formed between the third lens and the fourth lens can be made not excessive, that is, the image side optical surface of the third lens is controlled. The absolute value of the radius of curvature of the object side optical surface of the fourth lens is not too small to improve the workability of the lens.

Formula (3) shows the curved shape of the object side optical surface and the image side optical surface of the third lens, whereby the spherical aberration is corrected and the astigmatism is reduced, and good image quality can be obtained under the condition of shortening the entire length.

Preferably, the object side optical surface of the third lens of the five-lens optical imaging lens of the present invention may have at least one inflection point, and one of the at least one inflection point conforms to the condition of the formula (4) :

Wherein H _{_} is the distance from one of the inflection points of the object side optical surface of the third lens to the optical axis along a direction perpendicular to the optical axis; and H _t is the maximum optical effective of the object side optical surface of the third lens The distance of the point along the direction perpendicular to the optical axis to the optical axis.

Further, the object side optical surface of the third lens of the five-lens optical imaging lens of the present invention has a second inflection point in addition to the inflection point satisfying the condition of the formula (4), and the second inversion The curve points are in accordance with the conditions of formula (5):

Wherein H _2P is the distance from the second inflection point of the object side optical surface of the third lens to the optical axis along a direction perpendicular to the optical axis; H _t is the maximum optical effective point of the object side optical surface of the third lens The distance from the direction perpendicular to the optical axis to the optical axis.

By providing the inflection point on the object side optical surface of the third lens, the object side optical surface of the third lens has a concave surface that is in contact with the convex surface at the paraxial axis, and the aberration is corrected to change the refractive direction of the light beam. Further, the combination of the formula (4) or the formula (4) and the formula (5) can be used to limit the position of the inflection point, thereby obtaining a better image quality.

Further, the five-lens optical imaging lens of the present invention can selectively conform to one or a combination of the formulas (6) to (11):

-3.3≦f ₂₃ /f≦-2.6 ......(7)

0.5≦f/f ₃₄₅ <1 ......(9)

TTL≦5 mm ......(11)

Wherein D ₂ is the distance from the image side optical surface of the first lens to the aperture stop on the optical axis; D ₃ is the distance from the aperture stop on the optical axis to the object side optical surface of the second lens; D ₅ is light a distance from the image side optical surface of the second lens to the object side optical surface of the third lens; D ₇ is a distance from the image side optical surface of the third lens to the object side optical surface of the fourth lens on the optical axis; D ₉ is the distance from the image side optical surface of the fourth lens to the object side optical surface of the fifth lens on the optical axis; f is the system focal length of the lens; fB is the system back focal length of the lens; f ₂₃ is the second lens and the a composite focal length of the three lenses; L ₅ R ₁ is the radius of curvature of the object side optical surface of the fifth lens; L ₄ R ₂ is the radius of curvature of the image side optical surface of the fourth lens; Nd ₄ is the refractive index of the fourth lens; Nd ₅ is the refractive index of the fifth lens; f ₃₄₅ is the combined focal length of the third lens to the fifth lens; TTL is the distance from the object side optical surface of the first lens to the imaging surface of the taking lens on the optical axis.

Among them, the equation (6) can further effectively reduce the air gap between the lenses under the condition of maintaining the image quality, thereby making the total length of the lens system shorter. The ratio of the combined focal length of the second lens to the third lens to the focal length of the system can be further controlled by equation (7) such that the second lens cooperates with the third lens to provide a suitable negative refractive power to diverge the focused beam from the first lens. And correct the aberrations. The focal length of the air lens formed between the fourth lens and the fifth lens can be appropriately restricted by the formula (8), thereby improving the correction of the image plane and the condition of lens workability. When the value of the formula (8) is greater than or equal to 1, the air lens formed between the fourth lens and the fifth lens can maintain sufficient positive refractive power to focus the image on the photosensitive element, and can also control the system of Petzval. The sum (Petzval sum) is too large to maintain the flatness of the image plane. On the other hand, when the value of the formula (8) is less than or equal to 1.5, the positive refractive power of the air lens formed between the fourth lens and the fifth lens can be prevented from being excessively large, that is, the image side optical surface of the fourth lens is controlled. The absolute value of the radius of curvature of the object side optical surface of the five lens is not too small to improve the processability of the lens.

By the formula (9), the ratio of the focal length of the system to the combined focal length of the third to fifth lenses can be further controlled such that the settings of the third to fifth lenses synthetically provide an appropriate positive refractive power to focus the beam and correct Aberration. By formula (10), the ratio of the back focus to the focal length of the lens system can be further defined so that the lens system has sufficient back focus for accommodating other optical components (such as infrared filters or watch glasses, etc.). By the formula (11), it is possible to further provide a lens having a smaller overall length of the system to facilitate installation in a small or thin electronic device.

Preferably, the object side optical surface and the image side optical surface of the first lens, the second lens, the third lens and the fourth lens are all aspherical. In a broad sense, surfaces other than spheres and planes can be called aspheric surfaces, including asymmetrical spatial surfaces (or free-form surfaces). Thereby, the size and weight of the system are reduced and the image quality is improved.

According to another object of the present invention, an image pickup apparatus including the aforementioned five-lens optical take-up lens and photoelectric conversion element is proposed.

The structure and technical features of the present invention are described in detail below with reference to the preferred embodiments and the accompanying drawings.

Referring to Fig. 1, there is shown a schematic structural view of an image pickup apparatus 2 of the present invention. The image pickup apparatus 2 includes a five-lens optical take-up lens 1 and an image sensor 21 of the present invention, and a frame formed of a light-shielding member as a lens barrel. The body 22 and the circuit board 23 electrically connected to the image sensor 21. In some embodiments, the imaging device 2 may further have an optical component such as a watch glass or an infrared filter, wherein the watch glass may be selectively disposed on the object side of the optical imaging lens 1 or the optical imaging lens 1 and the image. The optical pickup lens 1 or the image sensor 21 can be protected between the sensors 21, and the infrared filter can be disposed between the optical imaging lens 1 and the image sensor 21. The five-lens optical imaging lens 1 includes a first lens 11 , an aperture stop S, and a first array arranged along the optical axis Z from the object side to the image side. The second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. The lens and the lens or the lens and the aperture S may have a spacer 17 as in FIG. 1 such that the lens has a predetermined spacing from the lens or lens and the aperture S, however, the lens is interposed between the lens or the lens and the aperture S. The design of the mechanism with a predetermined spacing is not limited. In FIG. 1, the imaging device 2 includes an infrared filter 16 disposed between the optical imaging lens 1 and the image sensor 21. That is, at the time of image capturing, the light of the object passes through the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15, and then passes through the infrared filter 16. The image is imaged on the imaging surface I of the image sensor 21.

The first lens 11 is a lenticular lens having a positive refracting power, that is, the radius of curvature of the object side optical surface L1R1 is positive, and the radius of curvature of the image side optical surface L1R2 is negative. In a preferred embodiment, the absolute value of the radius of curvature of the image side optical surface L1R2 of the first lens may be greater than the radius of curvature of the object side optical surface L1R1, thereby improving the spherical aberration correction effect and facilitating shortening. The total length of the optical pickup lens 1.

The second lens 12 is a crescent lens having a negative refractive power, and has a convex surface facing the object side and a concave surface facing the image side, that is, the curvatures of the object side optical surface L2R1 and the image side optical surface L2R2 of the second lens 12 are both positive. In a preferred embodiment, the second lens 12 can be made of a glass or plastic material having a refractive index of 1.6 to 2.1, and the object side optical surface L2R1 and the image side optical surface L2R2 are aspherical, to effectively The aberration is corrected to provide better imaging quality, and the overall length of the lens 1 is further reduced. Furthermore, in the present invention, the aperture stop S is disposed between the first lens 11 and the second lens 12, so that the radius of curvature of the object side optical surface L1R1 of the first lens 11 is reduced to facilitate the full length of the lens 1 When shortened, the angle of refraction of the far-axis beam passing through the object-side optical surface L1R1 of the first lens 11 will be controlled to optimize the image quality.

The third lens 13 is a lenticular lens having a positive refracting power, that is, the curvature of the object side optical surface L3R1 is positive, and the curvature of the image side optical surface L3R2 is negative. In this way, the first lens 11 having positive refracting power, the second lens 12 having negative refracting power, and the third lens 13 having positive refracting power become a so-called "triplet" type lens structure, and thus the first aspect of the present invention The lens 11 to the third lens 13 can provide good aberration correction. In order to correct the spherical aberration and reduce the astigmatism and obtain good imaging quality under the condition of shortening the full length, the third lens 13 has to satisfy the condition of the formula (3), thereby defining the object side optical surface L3R1 and the image side optical surface L3R2. The curved shape is to appropriately converge the light beam from the second lens 12 and to hit the fourth lens 14.

In a preferred embodiment, the object side optical surface L3R1 of the third lens 13 may have at least one inflection point, and one of the at least one inflection point is in conformity for better imaging quality. (4) Conditions. As shown in FIG. 2, the object side optical surface L3R1 of the third lens 13 is aspherical, and has an inflection point Pi from the center of the lens toward the optical effective area of the lens edge, thereby forming a central convex portion and a concave optical edge. surface. Wherein, the distance from the inflection point Pi to the optical axis in the direction perpendicular to the optical axis is denoted as H ₋ ; and the maximum optical effective point of the object-side optical surface L3R1 of the third lens 13 is along the perpendicular to the optical axis The distance from the direction to the optical axis (referred to as the optical effective radius) is denoted as H _t . Further, in order to correct the field curvature more effectively, the object side optical surface L3R1 of the third lens 13 may have two inflection points, and one of the inflection points conforms to the formula (4), and the second inflection point is in accordance with the formula. (5), that is, the object side optical surface L3R1 of the third lens 13 is sequentially convex-concave-convex curved surface from the optical axis to the edge to provide an appropriate refractive power of the beam with different off-axis heights to correct the aberration .

In a preferred embodiment, the ratio of the combined focal length f _{23 of the} second lens 12 to the third lens 13 to the focal length f of the system can be further optimized by the formula (7), so that the second lens 12 is fitted with the third lens. 13 provides a suitable negative refractive power to diverge the focused beam from the first lens 11 and correct the aberration.

The fourth lens 14 is a crescent lens having a positive refractive power, and has a concave surface facing the object side and a convex surface facing the image side, that is, the curvatures of the object side optical surface L4R1 and the image side optical surface L4R2 of the fourth lens 14 are both negative. The Petzval sum for the control system is not too large to maintain the flatness of the image plane, the air lens formed between the third lens and the fourth lens has an appropriate negative refractive power, and avoids controlling the image of the third lens. The lens processing is difficult due to the excessively small absolute value of the radius of curvature of the object side optical surface of the fourth lens and the fourth lens, and the third lens 13 and the fourth lens 14 must satisfy the condition of the formula (2) to obtain good imaging quality. Easy to machine lens.

The fifth lens 15 is an aspherical lens having a negative refracting power, and the object side optical surface and the image side optical surface respectively have at least one inflection point, and the object side optical surface has a convex surface at a paraxial shape, and the image side optical surface is near. The shaft is concave. In a preferred embodiment, in order to appropriately limit the focal length of the air lens formed between the fourth lens and the fifth lens, thereby improving the correction of the image plane and the condition of lens workability, the fourth lens 14 and the fifth lens 15 may be The condition of the formula (8) is further satisfied. Thereby, the air lens formed between the fourth lens 14 and the fifth lens 15 has sufficient positive refractive power to focus the image on the image sensor 21, and the Petzval sum of the system is compared. Small and maintain the flatness of the image plane. On the other hand, the formula (8) can be further used to improve the processability of the lens. In other preferred embodiments, the combined focal length of the third lens 13, the fourth lens 14 and the fifth lens 15 can satisfy the condition of the formula (9), so that the third lens 13 to the fifth lens 15 are provided in combination. A proper positive refractive power is used to focus the beam and correct the aberrations.

By a lenticular lens having a positive refracting power (ie, the first lens 11), a second lens 12 having a concave side of the object side convex image having a negative refracting power, a lenticular lens having a positive refracting power (ie, the third lens 13), having a positive refracting power a fourth lens 14 having a convex side image and an aspherical lens having a negative refractive power and an inflection point on both sides (ie, the fifth lens 15), and satisfying at least the conditions of the formulas (1) to (3), The optical image pickup lens 1 of the present invention can still have a wide viewing angle and obtain good image quality under the condition of reducing the overall length of the system.

In addition, in the preferred embodiment, the optical image taking lens 1 can further reduce the air gap between the lenses by using the formula (6) to further maintain the imaging quality, thereby making the full length of the lens system. Shorter. Moreover, in other preferred embodiments, the optical image taking lens 1 can further provide a lens having a smaller system length by using the formula (11) to facilitate installation in a small or thin electronic device. in.

In a preferred embodiment, the first lens 11, the third lens 13, the fourth lens 14 and the fifth lens 15 can be made of glass or plastic material having a refractive index lower than 1.63, and the lenses can be made of Both the object side optical surface and the image side optical surface are aspherical surfaces to effectively correct aberrations to provide better imaging quality, and further reduce the overall length of the optical imaging lens 1.

The IR cut-off filter 16 may be a lens or a film having an infrared filter function and attached to the watch glass by a coating technique. In a preferred embodiment, the optical image taking lens 1 can further define the ratio of the back focus to the focal length of the lens system by the formula (10), so that the lens system has sufficient back focus for accommodating other optical components (for example, Infrared filter or watch glass, etc.). The image sensor 21 can be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) for converting an image into an electrical signal.

In various embodiments of the invention, the aspherical surface formula of the following formula (11) is used to represent the aspherical shape:

Where Z(h) is the distance (SAG value) of any point on the optical surface of the lens from the optical axis direction to the center point of the lens, c is the curvature of the aspherical vertex, and h is any point along the optical axis of the optical surface of the lens. The distance from the direction to the optical axis, K is the conic constant, A ₄ , A ₆ , A ₈ , A ₁₀ , A ₁₂ , A ₁₄ are respectively four, six, eight, ten, twelve, fourteenth order Nth Order Aspherical Coefficient. It should be noted that the aspheric equations listed here are only one way of aspherical shape representation, and any aspherical equation representing axisymmetry should be available to make any of the optical imaging lenses 1 of the present invention. The aspherical optical surface of the lens should not be limited to this.

In order to explain the embodiments derived from the main technical features of the present invention, a total of seven aspects of the optical imaging lens 1 will be listed below, but the size, various coefficients and components of the optical imaging lens 1 of the present invention The data should not be limited. Further, in each of the embodiments, the radius of curvature Ri of each optical surface on the optical axis, the distance Di between the surfaces on the optical axis, the system full length (TTL) of the optical image taking lens 1, and the unit of each focal length are all mm. In each of the examples, the surface to which [*] is attached after each surface number is an optical surface having an aspherical shape.

<First Embodiment>

Please refer to FIG. 3 and FIG. 4 , which are schematic diagrams of optical paths and structures and aberrations of the first embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

In the following list (1), the optical surface number (i) sequentially numbered from the object side to the image side in the optical imaging lens 1 and the radius of curvature R _{i of} each optical surface on the optical axis are listed, respectively, and the optical axis The distance D _i , the refractive index Nd _i of each lens, the Abbe's number of each lens νd _i , the system focal length f of the optical image taking lens 1, the maximum field angle of view 2ω, the back focus fB, the system full length TTL, the first The combined focal length f ₂₃ of the second lens and the third lens and the combined focal length f _{345 of the} third lens to the fifth lens.

The following table (2) lists the coefficients of the aspherical (11) of each optical surface, where E represents the power multiplication of 10:

In the present embodiment, the maximum field angle of view 2ω is 73.1°, which conforms to equation (1); the full-length TTL of the system is 4.88 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The object side optical surface L3R1 of the third lens 13 has no inflection point, and the object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.94 mm; and the recurve point of the object side optical surface L5R1 of the fifth lens 15 to the optical axis is along the direction perpendicular to the optical axis. The result of dividing the distance H _10i by the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 0.272. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.41 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H along the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.568.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (3) and the equations (6) to (11), and the results of the respective equations are as shown in the following list (3).

<Second embodiment>

Please refer to FIG. 5 and FIG. 6 , which are respectively a schematic diagram of optical paths and structures and aberrations of the second embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane. The numerical values of the optical image pickup lens 1 of the second embodiment are shown in the following table (4). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (5) lists the coefficients of the aspherical (11) of each optical surface:

In the present embodiment, the maximum field angle of view 2ω is 73.1°, which conforms to equation (1); the full-length TTL of the system is 4.89 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The maximum object-side optical surface of the optical effective L3R1 point of the third lens 13 in the optical axis direction along the optical axis to the vertical distance H _t of 0.95 mm, and the object side optical surface L3R1 of the third lens 13 having an inflection point . The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.93 mm; and the recurve point to the optical axis of the object side optical surface L5R1 of the fifth lens 15 along the direction perpendicular to the optical axis The result of dividing the distance H _10i by the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 0.222. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.38 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H along the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.575.

In the present embodiment, the optical image taking lens 1 satisfies the conditions of the equations (1) to (4) and the equations (6) to (11), and the lower list (six) lists the calculation results of the respective conditional expressions.

<Third embodiment>

Please refer to FIG. 7 and FIG. 8 , which are respectively a schematic diagram of optical paths and structures and aberrations of the third embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

The numerical values of the optical image pickup lens 1 of the third embodiment are shown in the following list (7). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (8) lists the coefficients of the aspherical (11) of each optical surface:

In the present embodiment, the maximum field angle of view 2ω is 73.8°, which conforms to equation (1); the full-length TTL of the system is 4.78 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The maximum object-side optical surface of the optical effective L3R1 point of the third lens 13 in the optical axis direction along the optical axis to the vertical distance H _t is 0.9 mm, and the object side optical surface L3R1 of the third lens 13 having an inflection point . The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.85 mm; and the arcuate point to the optical axis of the object side optical surface L5R1 of the fifth lens 15 along the direction perpendicular to the optical axis The result of dividing the distance H _10i by the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 0.224. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.31 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H along the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.583.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (4) and the equations (6) to (11), and the following table (9) lists the conditional expressions in the embodiment. The result of the operation.

<Fourth embodiment>

Please refer to FIG. 9 and FIG. 10 , which are schematic diagrams of optical paths and structures and aberrations of the fourth embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

The numerical values of the optical image pickup lens 1 of the fourth embodiment are shown in the following list (10). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (11) lists the coefficients of the aspherical (11) of each optical surface:

In this embodiment, the maximum field angle of view 2ω is 73.8°, which conforms to equation (1); the full-length TTL of the system is 4.79 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The object side optical surface L3R1 of the third lens 13 has no inflection point. The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.92 mm; and the arcuate point of the object side optical surface L5R1 of the fifth lens 15 to the optical axis is along the direction perpendicular to the optical axis. The result of dividing the distance H _10i by the optical effective radius H _10T of the object-side optical surface L5R1 of the fifth lens 15 is 0.267. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.36 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H in the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.596.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (3) and the equations (6) to (11), and the following table (12) lists the conditional expressions in the embodiment. The result of the operation.

<Fifth Embodiment>

Please refer to FIG. 11 and FIG. 12 , which are schematic diagrams of optical paths and structures and aberrations of the fifth embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

The numerical values of the optical image pickup lens 1 of the fifth embodiment are shown in the following list (13). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (fourteen) lists the coefficients of the aspherical (11) of each optical surface:

Table (14)

In this embodiment, the maximum field angle of view 2ω is 73.8°, which conforms to equation (1); the full-length TTL of the system is 4.83 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The object side optical surface L3R1 of the third lens 13 has no inflection point. The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.84 mm; and the inflection point of the object side optical surface L5R1 of the fifth lens 15 to the optical axis is along the direction perpendicular to the optical axis. The result of dividing the distance H _10i by the optical effective radius H _10T of the object-side optical surface L5R1 of the fifth lens 15 is 0.277. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.29 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H in the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.606.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (3) and the equations (6) to (11), and the following table (fifteen) lists the conditional expressions in the embodiment. The result of the operation.

<Sixth embodiment>

Please refer to FIG. 13 and FIG. 14 , which are respectively a schematic diagram of optical paths and structures and aberrations of the sixth embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

The numerical values of the optical image pickup lens 1 of the sixth embodiment are shown in the following table (16). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (17) lists the coefficients of the aspherical (11) of each optical surface:

In this embodiment, the maximum field angle of view 2ω is 73.8°, which conforms to equation (1); the full-length TTL of the system is 4.81 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The object side optical surface L3R1 of the third lens 13 has no inflection point. The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.88 mm; and the recurve point to the optical axis of the object side optical surface L5R1 of the fifth lens 15 along the direction perpendicular to the optical axis The result of dividing the distance H _10i by the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 0.2997. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.29 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H in the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.601.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (3) and the equations (7) to (11), and the following table (eighteen) lists the conditional expressions in the embodiment. The result of the operation.

<Seventh embodiment>

Please refer to FIG. 15 and FIG. 16 , which are respectively a schematic diagram of optical paths and structures and aberrations of the seventh embodiment of the optical imaging lens 1 of the present invention. The aberration diagram includes (a) spherical aberration of imaging, (b) field curvature and (c) imaging distortion map, and the solid line represents the sagittal image plane, and the dotted line Indicates the meridian image plane.

The numerical values of the optical image pickup lens 1 of the seventh embodiment are shown in the following list (19). The symbol description of each numerical value is the same as that of the table (1), and will not be described herein.

The following table (20) lists the coefficients of the aspherical (11) of each optical surface:

In the present embodiment, the maximum field angle of view 2ω is 73.06°, which conforms to equation (1); the full-length TTL of the system is 4.91 mm, which conforms to equation (11). The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all made of optical plastic, and the infrared filter 16 is made of glass. The maximum object-side optical surface of the optical effective L3R1 point of the third lens 13 in the optical axis direction along the optical axis to the vertical distance H _t of 0.95 mm, and the object side optical surface L3R1 of the third lens 13 has two inflection point . The object side optical surface L5R1 and the image side optical surface L5R2 of the fifth lens 15 each have an inflection point. Wherein, the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 1.81 mm; and the arcuate point to the optical axis of the object side optical surface L5R1 of the fifth lens 15 along the direction perpendicular to the optical axis The result of dividing the distance H _10i by the optical effective radius H _10T of the object side optical surface L5R1 of the fifth lens 15 is 0.208. The optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 is 2.29 mm; and the distance from the inflection point of the image side optical surface L5R2 of the fifth lens 15 to the optical axis H in the direction perpendicular to the optical axis _{The result of} dividing the optical effective radius H _11T of the image side optical surface L5R2 of the fifth lens 15 by _11i is 0.588.

In the present embodiment, the optical image taking lens 1 conforms to the conditions of the equations (1) to (5) and the equations (7) to (10), and the following table (21) lists the conditions in the embodiment. The result of the operation.

The common technical feature of the above seven embodiments is that the five-lens optical imaging lens 1 of the present invention includes: a first lens 11 and an aperture stop S which are sequentially arranged from the object side to the image side along the optical axis Z, The second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15. The first lens 11 has a positive refracting power, and both the object side optical surface and the image side optical surface are convex; the second lens 12 has a negative refracting power with a convex surface facing the object side and a concave surface facing the image side; and the third lens 13 has a positive refracting power, The object side optical surface and the image side optical surface are both convex surfaces; the fourth lens 14 has a positive refractive power, the concave surface faces the object side and the convex surface faces the image side; the fifth lens 15 has a negative refractive power, and the object side optical surface and the image side optical surface All of them are aspherical and each have at least one inflection point, and the paraxial optical surface has a convex surface at the paraxial shape and the paraxial optical surface has a concave surface. Among them, the five-lens optical take-up lens 1 of the present invention satisfies at least the conditions of the formulas (1) to (3). According to the seven embodiments listed above and the aberration diagrams thereof, it can be known that the five-lens optical imaging lens 1 according to the present invention can be used for a shorter total length of the lens, preferably, the total length of the lens is less than 5 mm. The wide viewing angle and good image quality can be made, making the optical image taking lens 1 more advantageous for use in small electronic devices.

The above are only the preferred embodiments of the present invention, and are merely illustrative and not restrictive. It will be apparent to those skilled in the art that many changes, modifications, and equivalents may be made without departing from the spirit and scope of the invention.

1. . . Optical imaging lens

2. . . Camera

11. . . First lens

S. . . Light

12. . . Second lens

13. . . Third lens

14. . . Fourth lens

15. . . Fifth lens

16. . . Infrared filter

17. . . Spacer

twenty one. . . Image sensor

twenty two. . . framework

twenty three. . . Circuit board

L1R1. . . First lens side optical surface

L1R2. . . First lens image side optical surface

L2R1. . . Second lens side optical surface

L2R2. . . Second lens image side optical surface

L3R1. . . Third lens side optical surface

L3R2. . . Third lens image side optical surface

L4R1. . . Fourth lens side optical surface

L4R2. . . Fourth lens image side optical surface

L5R1. . . Fifth lens side optical surface

L5R2. . . Fifth lens image side optical surface

Pi. . . (third lens) inflection point

Z. . . Optical axis

H _- . . . Distance from the inflection point Pi to the optical axis along a direction perpendicular to the optical axis

H _t . . . The distance from the maximum optical effective point to the optical axis along the direction perpendicular to the optical axis (referred to as the optical effective radius)

I. . . Imaging surface

1 is a schematic cross-sectional view showing the structure of an image pickup apparatus of the present invention;

2 is a schematic cross-sectional view showing an optical axis direction of an object side optical surface of a third lens of the image taking lens of the present invention;

3 is a schematic cross-sectional view showing the optical path and the optical axis direction of the first embodiment of the optical imaging lens of the present invention;

4 is a schematic diagram of aberrations of the first embodiment of the optical imaging lens of the present invention (imaged (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 5 is a cross-sectional view showing the optical path and the optical axis direction of the second embodiment of the optical imaging lens of the present invention;

Figure 6 is a diagram showing aberrations of the second embodiment of the optical imaging lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 7 is a cross-sectional view showing the optical path and the optical axis direction of the third embodiment of the optical imaging lens of the present invention;

Figure 8 is a diagram showing aberrations of the third embodiment of the optical imaging lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 9 is a cross-sectional view showing the optical path and the optical axis direction of the fourth embodiment of the optical imaging lens of the present invention;

Figure 10 is a diagram showing aberrations of the fourth embodiment of the optical imaging lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 11 is a cross-sectional view showing the optical path and the optical axis direction of the fifth embodiment of the optical imaging lens of the present invention;

Figure 12 is a diagram showing aberrations of the fifth embodiment of the optical imaging lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 13 is a cross-sectional view showing the optical path and the optical axis direction of the sixth embodiment of the optical imaging lens of the present invention;

Figure 14 is a diagram showing the aberration of the sixth embodiment of the optical imaging lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram);

Figure 15 is a cross-sectional view showing the optical path and the optical axis direction of the seventh embodiment of the optical imaging lens of the present invention;

Fig. 16 is a view showing aberrations of the seventh embodiment of the optical pickup lens of the present invention (image (a) spherical aberration, (b) field curvature and (c) distortion diagram).

1. . . Optical imaging lens

2. . . Camera

11. . . First lens

S. . . Light

12. . . Second lens

13. . . Third lens

14. . . Fourth lens

15. . . Fifth lens

16. . . Infrared filter

17. . . Spacer

twenty one. . . Image sensor

twenty two. . . framework

twenty three. . . Circuit board

Claims (11)

A five-lens optical imaging lens, which is arranged along the optical axis from the object side to the image side in sequence: a first lens having a positive refracting power, the object side optical surface and the image side optical surface being convex surfaces; an aperture a second lens having a negative refracting power with a convex surface facing the object side and a concave surface facing the image side; a third lens having a positive refracting power, the object side optical surface and the image side optical surface being convex surfaces; a fourth lens Having a positive refracting power with a concave surface facing the object side and a convex surface facing the image side; and a fifth lens having a negative refracting power, the object side optical surface and the image side optical surface are both aspherical and respectively having at least one inflection point, The paraxial optical surface of the object side is a convex surface, and the paraxial optical surface is a concave surface; wherein the five-lens optical imaging lens satisfies the following condition: 85° ≧ 2ω ≧ 60°; Wherein L ₃ R _{1 is} the radius of curvature of the object side optical surface of the third lens; L ₃ R _{2 is} the radius of curvature of the image side optical surface of the third lens; L ₄ R _{1 is} the object side of the fourth lens a radius of curvature of the optical surface; Nd _{3 is} a refractive index of the third lens; Nd _{4 is} a refractive index of the fourth lens; and D ₇ is an image-side optical surface of the third lens on the optical axis to the fourth lens The distance of the side optical surface; 2ω is the maximum field angle of the image taking lens. The five-lens optical imaging lens of claim 1, wherein the object side optical surface of the third lens has at least one inflection point, and one of the at least one inflection point satisfies the following condition : Wherein, H _- one of which is a direction perpendicular to the optical axis, the third lens of the object side optical surface of at least one inflection point on the optical axis of the distance; H _t for the object side of the third lens The maximum optical effective point of the optical surface is along the direction perpendicular to the optical axis to the optical axis. The five-lens optical imaging lens of claim 2, wherein the object side optical surface of the third lens further has a second inflection point, and the second inflection point satisfies the following conditions: Wherein H _{2P is} the distance from the second inflection point of the object side optical surface of the third lens to the optical axis along a direction perpendicular to the optical axis; H _t is the maximum optical of the object side optical surface of the third lens The effective point is along the direction perpendicular to the optical axis to the optical axis. For example, the five-lens optical imaging lens described in claim 1 of the patent application is more in accordance with the following conditions: Wherein D ₂ is the distance from the image side optical surface of the first lens to the aperture stop on the optical axis; D ₃ is the distance from the aperture stop to the object side optical surface of the second lens on the optical axis; D ₅ is a distance from the image side optical surface of the second lens to the object side optical surface of the third lens on the optical axis; D ₇ is an optical axis from the image side optical surface of the third lens to the fourth lens The distance of the object side optical surface; D ₉ is the distance from the image side optical surface of the fourth lens to the object side optical surface of the fifth lens on the optical axis; f is the system focal length of the optical imaging lens. The five-lens optical imaging lens described in claim 1 further meets the following condition: -3.3≦f ₂₃ /f≦-2.6, where f _{23 is} the combined focal length of the second lens and the third lens ;f is the system focal length of the optical imaging lens. For example, the five-lens optical imaging lens described in claim 1 of the patent application is more in accordance with the following conditions: Wherein L ₅ R _{1 is} the radius of curvature of the object side optical surface of the fifth lens; L ₄ R _{2 is} the radius of curvature of the image side optical surface of the fourth lens; Nd _{4 is} the refractive index of the fourth lens; Nd _{5 is} the refractive index of the fifth lens; D ₉ is the distance from the image side optical surface of the fourth lens to the object side optical surface of the fifth lens on the optical axis. For example, the five-lens optical imaging lens described in claim 1 further meets the following condition: 0.5≦f/f ₃₄₅ <1, wherein f _{345 is} the third lens, the fourth lens and the fifth lens The composite focal length; f is the focal length of the optical imaging lens. For example, the five-lens optical imaging lens described in claim 1 of the patent application is more in accordance with the following conditions: Where f is the focal length of the optical imaging lens; fB is the back focal length of the optical imaging lens. The five-lens optical imaging lens described in claim 1 further meets the following conditions: TTL ≦ 5 mm; wherein TTL is on the optical axis from the object side optical surface of the first lens to the five-lens type The distance from the imaging surface of the optical pickup lens. The five-lens optical imaging lens of claim 1, wherein the object side optical surface and the image side optical surface of the first lens, the second lens, the third lens, and the fourth lens are Aspherical. An image pickup apparatus comprising: a photoelectric conversion element for photoelectrically converting a subject; and a five-lens optical image taking lens according to any one of claims 1 to 10.