TW201441651A - Compact lens - Google Patents

Abstract

A compact lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, and a fifth lens in sequential order along an optical axis from one object side to an imaging plane. The first lens is a convexo-concave lens with negative diopter, and the convex surface faces the object side and the concave surface faces the imaging plane. The second lens has positive diopter, and the convex surface faces the mirror plane of the object side. The third lens is a double convex lens with positive diopter. The fourth lens is a double concave lens with negative diopter. The fifth lens has a convex surface facing the mirror plane of the object side.

Description

Miniaturized lens

The present invention is applied to an optical lens, and particularly to a miniaturized lens.

In recent years, due to the booming mobile devices, the market demand for digital camera modules has been promoted. In order to provide convenience and portability of mobile devices, the market generally hopes to develop toward miniaturization and light weight while maintaining quality. The miniaturization and lightness of the factors have also driven the demand of other application markets, such as the automotive industry, the game console industry, and the home appliance industry, all of which have begun to use miniaturized image capture devices to create more convenient functions.

At present, the photosensitive elements of the general camera module can be mainly divided into a photosensitive coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), in which CMOS has low cost and low power consumption. With high integration, CMOS has gradually become the mainstream of mobile devices in the market. In addition, due to the advancement of semiconductor process technology, the size of the pixel can be greatly reduced. This factor allows the photosensitive element to provide a higher pixel image, but also reduces the amount of light, so that the amount of light is reduced, and the lens system is inevitable. Provide higher brightness to reduce the effects of noise.

With the miniaturization of these video devices in recent years, the size of the above-described image capturing device and the lens applied to the above-described image device has also been greatly reduced. In addition, since the pixels of the image capturing device are getting higher and higher, the lens used for the image capturing device can also have higher optical performance, so that the image capturing device can achieve high resolution. Degree and high contrast. Therefore, miniaturization and high optical performance are two essential elements for the lens of imaging equipment.

In addition, the miniaturized lenses used in video equipment are gradually developing towards wide angles, but wide-angle systems often have distortion and chromatic aberration problems, which easily affect their image quality. In addition, under the consideration of cost reduction, the market mostly replaces glass with plastic, but the plastic material changes temperature. It is sensitive, which makes its imaging easy to be affected by temperature, and has the disadvantage of unstable image quality.

In view of this, the main purpose is to provide a miniaturized lens which is composed of five lenses. In addition to providing miniaturization and high light quantity, it can also effectively improve the distortion and chromatic aberration problems commonly found in wide-angle systems. At low cost, it also reduces the sensitivity of its temperature.

In order to achieve the above object, the miniaturized lens provided by the present invention comprises a first lens, a second lens, an aperture, and a third lens arranged from an object side to an imaging surface and sequentially along an optical axis. a fourth lens and a fifth lens; wherein the first lens is a convex-concave lens having a negative refractive power, and a convex surface faces the object side, and a concave surface faces the imaging surface; the second lens has a positive refractive power, and The mirror surface facing the object side is a convex surface; the third lens is a lenticular lens having a positive refractive power; the fourth lens is a double concave lens having a negative refractive power; and the mirror surface of the fifth lens facing the object side is convex.

Thereby, through the above optical design, the miniaturized lens can have the effects of small size, wide angle, small optical distortion and high optical performance.

1~9‧‧‧Small lens

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧ fourth lens

L5‧‧‧ fifth lens

ST‧‧‧ aperture

Z‧‧‧ optical axis

CF‧‧‧Filter

Im‧‧‧ imaging surface

S1~S13‧‧‧Mirror

1 is a lens diagram of a first preferred embodiment of the present invention; FIG. 2A is a field curvature diagram of a first preferred embodiment of the present invention; FIG. 2B is a distortion diagram of a first preferred embodiment of the present invention; FIG. 3 is a perspective view of a second preferred embodiment of the present invention; FIG. 4B is a second view of the second preferred embodiment of the present invention; FIG. The distortion diagram of the preferred embodiment; FIG. 4C is a lateral chromatic aberration diagram of the second preferred embodiment of the present invention; Figure 5 is a perspective view of a third preferred embodiment of the present invention; Figure 6A is a field diagram of a third preferred embodiment of the present invention; Figure 6B is a distortion diagram of a third preferred embodiment of the present invention; FIG. 7 is a perspective view of a fourth preferred embodiment of the present invention; FIG. 8B is a fourth embodiment of the present invention; FIG. FIG. 8C is a transverse chromatic aberration diagram of a fourth preferred embodiment of the present invention; FIG. 9 is a lens diagram of a fifth preferred embodiment of the present invention; FIG. 10A is a fifth preferred embodiment of the present invention; FIG. 10B is a distortion diagram of a fifth preferred embodiment of the present invention; FIG. 10C is a lateral chromatic aberration diagram of a fifth preferred embodiment of the present invention; FIG. 11 is a lens diagram of a sixth preferred embodiment of the present invention; 12A is a field curvature diagram of a sixth preferred embodiment of the present invention; FIG. 12B is a distortion diagram of a sixth preferred embodiment of the present invention; FIG. 12C is a lateral chromatic aberration diagram of a sixth preferred embodiment of the present invention; FIG. Figure 7A is a field diagram of a seventh preferred embodiment of the present invention; Figure 14B is a field diagram of the seventh preferred embodiment of the present invention; 7 is a transverse chromatic aberration diagram of a seventh preferred embodiment of the present invention; FIG. 15 is a lens diagram of an eighth preferred embodiment of the present invention; and FIG. 16A is an eighth preferred embodiment of the present invention. FIG. 16B is a distortion diagram of an eighth preferred embodiment of the present invention; FIG. 16C is a lateral chromatic aberration diagram of the eighth preferred embodiment of the present invention; Figure 17 is a perspective view of a ninth preferred embodiment of the present invention; Figure 18A is a field diagram of a ninth preferred embodiment of the present invention; Figure 18B is a distortion diagram of a ninth preferred embodiment of the present invention; Lateral chromatic aberration diagram of the ninth preferred embodiment of the invention

In order that the present invention may be more clearly described, the preferred embodiments are illustrated in the accompanying drawings.

Referring to FIG. 1 , a miniaturized lens 1 according to a first preferred embodiment of the present invention includes a first lens L1 and a second lens L2 arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. An aperture ST, a third lens L3, a fourth lens L4, and a fifth lens L5. In addition, depending on the requirements of use, an optical filter CF may be disposed between the fifth lens L5 and the imaging surface Im to filter out unnecessary noise light, thereby improving optical performance. The purpose. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, so that the miniaturized lens 1 has wide-angle optics. characteristic. In addition, both sides S1 and S2 of the first lens L1 are aspherical surfaces, and the non-spherical surface is designed to effectively correct the distortion problem that the miniaturized lens 1 is prone to in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S3 and S4 are spherical surfaces. The structure of the second lens L2 is to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 1. The structure of the convex surface S3 facing the object side is designed to correct the spherical aberration and field generated by the first lens L1. The curvature is reduced and the manufacturing sensitivity of the lens L2 is lowered. Moreover, the glass material setting of the second lens L2 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is to effectively reduce the angle at which light enters the miniaturized lens 1 and is projected on the imaging surface Im, thereby effectively enhancing the aperture The amount of light entering the imaging surface Im, thereby shortening the imaging surface Im and the like The distance between the lenses L1 to L5 is effectively reduced for miniaturization. In addition, in addition to the above object, the aperture ST is disposed between the second lens L2 and the third lens L3, and the lens arrangement of the miniaturized lens 1 before and after the aperture ST is symmetrically designed to reduce manufacturing. Time sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a plastic material, and both sides S6 and S7 are aspherical surfaces.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. The purpose of designing the refractive power of the third lens L3 and the fourth lens L4 is to use the combination of the front positive refractive power lens and the negative negative power lens to make the total length of the system shorter than the front negative refractive power and then the positive refractive power combination. Optical design, to achieve the purpose of miniaturization.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 1, and to effectively adjust the angle at which the light is incident on the imaging surface Im. Improve the optical performance of the miniaturized lens 1.

In addition, in addition to the structural design of the lenses L1 to L5 described above, the miniaturized lens 1 satisfies the following conditions: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3-Vd4>20; wherein f is the focal length of the system of the miniaturized lens 1; TTL is the total length of the system of the miniaturized lens 1; f3 is the focal length of the third lens L3; and f4 is the fourth lens L4 The focal length; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Thereby, the miniaturized lens 1 can have the advantages of a wide angle and a short total system length by the design of the first item described above. The second item and the third item are that the chromatic aberration of the miniaturized lens 1 can be effectively eliminated by the combination of the focal length and the dispersion coefficient of the third lens L3 and the fourth lens L4, thereby improving the miniaturized lens 1 Imaging quality.

In order to achieve the above objectives and effectively improve the optical performance of the miniaturized lens 1, the present invention

The system focal length f of the miniaturized lens 1 of the first preferred embodiment, the total system length TTL, the radius of curvature R of the optical axis Z of each lens surface, the mirror surface and the next mirror surface (or imaging surface Im) are on the optical axis. The distance D on Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens are as shown in Table 1:

In each lens of this embodiment, the surface depression z of the aspherical surfaces S1, S2, S6, S7, S8, S9, S10, and S11 is obtained by the following formula:

Where: z: the degree of depression of the aspheric surface; c: the reciprocal of the radius of curvature; h: the aperture radius of the surface; k: the conic coefficient; α2 ~ α8: the order factor of the aperture radius h of the surface.

In this embodiment, the aspherical coefficient k of each aspheric surface and the respective order coefficients α2 to α8 are as shown in Table 2:

The lens L1 to L5 and the aperture ST are arranged in the above manner, so that the miniaturized lens 1 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 2A to FIG. 2C, wherein it can be seen from FIG. 2A. The maximum field curvature of the miniaturized lens 1 of the present embodiment does not exceed -0.10 mm and 0.04 mm; as can be seen from FIG. 2B, the maximum distortion of the miniaturized lens 1 of the present embodiment does not exceed -2% and 2%; As can be seen from Fig. 2C, the lateral chromatic aberration of the miniaturized lens 1 of the present embodiment does not exceed 2 μm and -1 μm. Therefore, the high optical efficiency of the miniaturized lens 1 of the present embodiment is apparent.

The above-described miniaturized lens 1 according to the first embodiment of the present invention; in accordance with the technology of the present invention, the miniaturized lens 2 of the second embodiment of the present invention will be described below with reference to FIG.

The miniaturized lens 2 of the second preferred embodiment of the present invention also includes a first lens L1, a second lens L2, and an aperture ST along an optical axis Z and sequentially arranged from an object side to an imaging surface Im. a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 2 has wide-angle optical characteristics, and the aspherical design can more effectively correct the distortion that the miniaturized lens 2 is prone to in wide-angle optical design. problem.

The second lens L2 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S3 and S4 are aspherical surfaces. The structure of the convex surface S3 of the second lens L2 facing the object side is designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 2, and at the same time correcting the spherical aberration and field generated by the first lens L1. The curvature is reduced and the manufacturing sensitivity of the lens L2 is lowered. In addition, the glass material setting of the second lens L2 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the previous embodiment, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 2 The lens design before and after the aperture ST presents a relatively symmetrical design, which can effectively increase the amount of light entering the imaging surface Im, shorten the distance between the imaging surface Im and the lenses L1 to L5, and reduce the manufacturing time. Sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a plastic material, and both sides S6 and S7 are aspherical surfaces.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. The design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiment, and the combination of the positive refractive power and the negative refractive power can be used to make the total length of the system shorter than the front negative refractive power and then the positive refractive power. The combined optical design achieves the goal of miniaturization.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 2, and to effectively adjust the angle at which the light is incident on the imaging surface Im. Improve the optical performance of the miniaturized lens 2.

Further, the miniaturized lens 2 also satisfies the following conditions, so that the miniaturized lens 2 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 2: (1) 0.1 < f /TTL<0.3;(2)0.8<| f3/f4 |<1.25; (3) Vd3-Vd4>20; wherein f is the focal length of the system of the miniaturized lens 2; TTL is the total length of the system of the miniaturized lens 2; f3 is the focal length of the third lens L3; and f4 is the fourth lens L4 The focal length; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 2, the system focal length f of the miniaturized lens 2 of the second preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table 3:

In the present embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 4:

The lens L1 to L5 and the aperture ST are arranged in the above manner, so that the miniaturized lens 2 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 4A to FIG. 4C, wherein it can be seen from FIG. 4A. The maximum field curvature of the miniaturized lens 2 of the embodiment does not exceed -0.04 mm and 0.02 mm; as can be seen from FIG. 4B, the maximum distortion of the miniaturized lens 2 of the embodiment does not exceed -3% and 1%; As can be seen from Fig. 4C, the lateral chromatic aberration of the miniaturized lens 2 of the present embodiment does not exceed -1 and 2 μm, and the high optical efficiency of the miniaturized lens 2 of the present embodiment is apparent.

Referring to FIG. 5, the miniaturized lens 3 of the third preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 3 has wide-angle optical characteristics, and the aspherical design can more effectively correct the distortion problem that the miniaturized lens 3 is prone to in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S3 and S4 are aspherical surfaces. The structure of the convex surface S3 of the second lens L2 facing the object side is designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 3, and at the same time correcting the spherical aberration and field generated by the first lens L1. The curvature is reduced and the manufacturing sensitivity of the lens L2 is lowered. In addition, the glass material setting of the second lens L2 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 3 The lens design before and after the aperture ST presents a relatively symmetrical design, which can effectively increase the amount of light entering the imaging surface Im, shorten the distance between the imaging surface Im and the lenses L1 to L5, and reduce the manufacturing time. Sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a plastic material, and both sides S6 and S7 are aspherical surfaces.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. Further, the fourth lens L4 is glued toward the mirror surface S8 on the object side and the mirror surface S7 of the third lens L3 facing the image plane Im. Furthermore, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the positive refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 3, and to effectively adjust the angle at which the light is incident on the imaging surface Im, and further Improve the optical performance of the miniaturized lens 3.

In addition, the miniaturized lens 3 also satisfies the following conditions, so that the miniaturized lens 3 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 3: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the system focal length of the miniaturized lens 3; TTL is the total length of the system of the miniaturized lens 3 F3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 3, the system focal length f of the miniaturized lens 3 of the third preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table 5:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 6:

The lens L1 to L5 and the aperture ST are arranged in the above manner, so that the miniaturized lens 3 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 6A to FIG. 6C, wherein it can be seen from FIG. 6A. The maximum field curvature of the miniaturized lens 3 of the present embodiment does not exceed -0.04 mm and 0.04 mm; as can be seen from FIG. 6B, the maximum distortion of the miniaturized lens 3 of the present embodiment does not exceed -1% and 3%; As can be seen from Fig. 6C, the lateral chromatic aberration of the miniaturized lens 3 of the present embodiment does not exceed -1 and 3 μm, and the high optical efficiency of the miniaturized lens 3 of the present embodiment is apparent.

Referring to FIG. 7, the miniaturized lens 4 of the fourth preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 4 has a wide-angle optical characteristic, and the aspherical design can also effectively correct the distortion problem that the miniaturized lens 4 is likely to occur in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. In addition, the structural design of the convex surface S3 of the second lens L2 toward the object side is also designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 4, and simultaneously correct the spherical aberration generated by the first lens L1. Field curvature and reduce the manufacturing sensitivity of the lens L2. . Furthermore, the radius of curvature of the optical axis region of the second lens L2 facing the surface S4 of the imaging surface Im is a positive value, and the radius of curvature from the optical axis region to the peripheral edge is negative, and the positive value is inversely transformed. In the design, the optical axis region mentioned above refers to the adjacent region including the passing position of the optical axis Z and its predetermined range, and the transflective design is designed to effectively reduce the phenomenon of coma aberration and astigmatism.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 4 The lens design before and after the aperture ST presents a relatively symmetrical design, and can effectively increase the amount of light entering the imaging surface Im, shorten the imaging surface Im and the lenses The distance between L1 and L5 and the sensitivity at the time of manufacture.

The third lens L3 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S6 and S7 are spherical surfaces. In addition, the glass material setting of the third lens L3 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. In addition, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the previous refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 4, and to effectively adjust the angle at which the light is incident on the imaging surface Im, and further The optical performance of the miniaturized lens 4 is improved.

In addition, the miniaturized lens 4 also satisfies the following conditions, so that the miniaturized lens 4 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 4: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the system focal length of the miniaturized lens 4; TTL is the total length of the system of the miniaturized lens 4 F3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 4, the system focal length f of the miniaturized lens 4 of the fourth preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table 7:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 8:

The lens L1 to L5 and the aperture ST are arranged in the above manner, so that the miniaturized lens 4 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 8A to FIG. 8C, wherein it can be seen from FIG. 8A. The maximum field curvature of the miniaturized lens 4 of the present embodiment does not exceed -0.10 mm and 0.06 mm; as can be seen from FIG. 8B, the maximum distortion of the miniaturized lens 4 of the present embodiment does not exceed -1% and 3%; As can be seen from Fig. 8C, the lateral chromatic aberration of the miniaturized lens 4 of the present embodiment does not exceed 3 μm, and it is apparent that the optical performance of the miniaturized lens 4 of the present embodiment is in compliance with the standard.

Referring to FIG. 9, the miniaturized lens 5 of the fifth preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 5 has a wide-angle optical characteristic, and the aspherical design can also effectively correct the distortion problem that the miniaturized lens 5 is likely to occur in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. The structural design of the convex surface S3 of the second lens L2 toward the object side is also designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 5, and simultaneously correct the spherical aberration and field curvature generated by the first lens L1. And reducing the manufacturing sensitivity of the lens L2.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 5 The lens design before and after the aperture ST presents a relatively symmetrical design, which can effectively increase the amount of light entering the imaging surface Im, shorten the distance between the imaging surface Im and the lenses L1 to L5, and reduce the manufacturing time. Sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S6 and S7 are aspherical surfaces. In addition, the glass material setting of the third lens L3 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. In addition, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the positive refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a negative refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and its both sides S10, S11 is an aspherical surface. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and astigmatism that may occur in the miniaturized lens 5, and to effectively adjust the angle at which the light is incident on the imaging surface Im. The optical performance of the miniaturized lens 5 is improved.

In addition, the miniaturized lens 5 also satisfies the following conditions, so that the miniaturized lens 5 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 5: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the system focal length of the miniaturized lens 5; TTL is the total length of the system of the miniaturized lens 5 F3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 5, the system focal length f of the miniaturized lens 5 of the fifth preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table IX:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 10:

The lens L1 to L5 and the aperture ST are arranged in the above-described manner, so that the miniaturized lens 5 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 10A to FIG. 10C, wherein it can be seen from FIG. 10A. The maximum field curvature of the miniaturized lens 5 of the present embodiment does not exceed -0.02 mm and 0.04 mm; as can be seen from FIG. 10B, the maximum distortion of the miniaturized lens 5 of the present embodiment does not exceed -2% and 2%; As can be seen from Fig. 10C, the lateral chromatic aberration of the miniaturized lens 5 of the present embodiment does not exceed -1 and 2 μm, and the high optical efficiency of the miniaturized lens 5 of the present embodiment is apparent.

Referring to FIG. 11, the miniaturized lens 6 of the sixth preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 6 has wide-angle optical characteristics, and the aspherical design can also effectively correct the distortion that the miniaturized lens 6 is prone to in wide-angle optical design. Change the problem.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. In addition, the structural design of the convex surface S3 of the second lens L2 toward the object side is also designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 6, and simultaneously correct the spherical aberration generated by the first lens L1. Field curvature and reduce the manufacturing sensitivity of the lens L2. Furthermore, the radius of curvature of the optical axis region of the second lens L2 facing the surface S4 of the imaging surface Im is a positive value, and the radius of curvature from the optical axis region to the peripheral edge is negative, and the positive value is inversely transformed. In the design, the optical axis region mentioned above refers to the adjacent region including the passing position of the optical axis Z and its predetermined range, and the transflective design is designed to effectively reduce the phenomenon of coma aberration and astigmatism.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 6 The lens design before and after the aperture ST presents a relatively symmetrical design, which can effectively increase the amount of light entering the imaging surface Im, shorten the distance between the imaging surface Im and the lenses L1 to L5, and reduce the manufacturing time. Sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S6 and S7 are aspherical surfaces. In addition, the glass material setting of the third lens L3 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. In addition, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the previous refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 6, and to effectively adjust the angle at which the light is incident on the imaging surface Im. The optical performance of the miniaturized lens 6 is improved.

In addition, the miniaturized lens 6 also satisfies the following conditions, so that the miniaturized lens 6 can have a wide angle, a short total system length, and effectively eliminate the miniaturized lens 6 The effect of aberration: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the focal length of the system of the miniaturized lens 6 TTL is the total length of the system of the miniaturized lens 6; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; Vd4 is the fourth lens Abbe's coefficient of L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 6, the system focal length f of the miniaturized lens 6 of the sixth preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table XI:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 12: Table 12

The lens L1 to L5 and the aperture ST are arranged in the above-described manner, so that the miniaturized lens 6 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 12A to FIG. 12C, wherein it can be seen from FIG. 12A. The maximum field curvature of the miniaturized lens 6 of the present embodiment does not exceed -0.04 mm and 0.04 mm; as can be seen from FIG. 12B, the maximum distortion of the miniaturized lens 6 of the embodiment does not exceed -3% and 2%; As can be seen from Fig. 12C, the lateral chromatic aberration of the miniaturized lens 6 of the present embodiment does not exceed -1 and 2 μm, and the high optical efficiency of the miniaturized lens 6 of the present embodiment is apparent.

Referring to FIG. 13, the miniaturized lens 7 of the seventh preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a glass material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 7 has a wide-angle optical characteristic, and the aspherical design can also effectively correct the distortion problem that the miniaturized lens 7 is likely to occur in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. In addition, the convex surface S3 of the second lens L2 is designed to face the object side, and the same is to assist the first lens L1 to correct the miniaturized lens 7 The distortion problem, and at the same time, corrects the spherical aberration and curvature of field generated by the first lens L1, and reduces the manufacturing sensitivity of the lens L2. Furthermore, the radius of curvature of the optical axis region of the second lens L2 facing the surface S4 of the imaging surface Im is a positive value, and the radius of curvature from the optical axis region to the peripheral edge is negative, and the positive value is inversely transformed. In the design, the optical axis region mentioned above refers to the adjacent region including the passing position of the optical axis Z and its predetermined range, and the design of the recurve can effectively reduce the phenomenon of coma aberration and astigmatism.

The aperture ST is disposed between the second lens L2 and the third lens L3. The same as the foregoing embodiments, the angle of the light incident on the imaging surface Im can be effectively reduced, and the lens design of the miniaturized lens 7 before and after the aperture ST can be symmetrically designed, and can be effectively improved. The amount of light entering the imaging surface Im, shortening the distance between the imaging surface Im and the lenses L1 to L5, and reducing the sensitivity at the time of manufacture.

The third lens L3 is a double convex lens having a positive refractive power and made of a glass material. The mirror, and both sides S6, S7 are aspherical surfaces. In addition, the glass material setting of the third lens L3 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The fourth lens L4 is a double concave lens having a negative refractive power and made of a plastic material. The mirror, and both sides S8, S9 are aspherical surfaces. In addition, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the positive refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex and concave type having a positive refractive power and made of a plastic material. The mirror has a convex surface S10 facing the object side, and a concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and astigmatism that may occur in the miniaturized lens 7, and to effectively adjust the angle at which the light is incident on the imaging surface Im. The optical performance of the miniaturized lens 7 is improved.

Further, the miniaturized lens 7 also satisfies the following conditions, so that the miniaturized lens 7 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 7: (1) 0.1 < f /TTL<0.3;(2)0.8<| f3/f4 |<1.25;(3)Vd3-Vd4>20; Where f is the focal length of the system of the miniaturized lens 7; TTL is the total length of the system of the miniaturized lens 7; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; and Vd3 is the third lens Abbe's coefficient of L3; Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 7, the system focal length f of the miniaturized lens 7 of the seventh preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table XIII:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 14:

The lens L1 to L5 and the aperture ST are arranged in the above-described manner, so that the miniaturized lens 7 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 14A to FIG. 14C, wherein it can be seen from FIG. 14A. The maximum field curvature of the miniaturized lens 7 of the present embodiment does not exceed -0.08 mm and 0.06 mm; as can be seen from FIG. 14B, the maximum distortion of the miniaturized lens 7 of the present embodiment does not exceed -3% and 2%; As can be seen from Fig. 14C, the lateral chromatic aberration of the miniaturized lens 7 of the present embodiment does not exceed -1 and 2 μm, and the high optical efficiency of the miniaturized lens 7 of the present embodiment is apparent.

Referring to FIG. 15, the miniaturized lens 8 of the eighth preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 8 has wide-angle optical characteristics, and the aspherical design can also effectively correct the distortion problem that the miniaturized lens 8 is prone to in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. In addition, the structural design of the convex surface S3 of the second lens L2 toward the object side is also designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 8, and simultaneously correct the spherical aberration generated by the first lens L1. Field curvature and reduce the manufacturing sensitivity of the lens L2.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 8 The lens design before and after the aperture ST is more symmetrical. In addition, the amount of light entering the imaging surface Im can be effectively increased, the distance between the imaging surface Im and the lenses L1 to L5 can be shortened, and the sensitivity at the time of manufacture can be reduced.

The third lens L3 is a lenticular lens having a positive refractive power and made of a glass material, and both sides S6 and S7 are spherical surfaces. In addition, the glass material setting of the third lens L3 can reduce the sensitivity of the system to temperature changes, so that the optical performance does not decay with temperature changes.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a glass material, and both sides S8 and S9 are spherical surfaces. Further, the fourth lens L4 is glued toward the mirror surface S8 on the object side and the mirror surface S7 of the third lens L3 facing the image plane Im. Furthermore, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the positive refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and both surfaces S10 and S11 thereof are aspherical surfaces. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 8, and to effectively adjust the angle at which the light is incident on the imaging surface Im. The optical performance of the miniaturized lens 8 is improved.

In addition, the miniaturized lens 8 also satisfies the following conditions, so that the miniaturized lens 8 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 8: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the system focal length of the miniaturized lens 8; TTL is the total length of the system of the miniaturized lens 8 F3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 8, the system focal length f of the miniaturized lens 8 of the eighth preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through. The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table 15:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 16:

The lens L1 to L5 and the aperture ST are arranged in the above manner, so that the miniaturized lens 8 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 16A to FIG. 16C, wherein it can be seen from FIG. 16A. The maximum field curvature of the miniaturized lens 8 of the embodiment does not exceed -0.08 mm and 0.06 mm; as can be seen from FIG. 16B, the maximum distortion of the miniaturized lens 8 of the embodiment does not exceed -3% and 2%; As can be seen from FIG. 16C, the lateral chromatic aberration of the miniaturized lens 8 of the present embodiment is not exceeded. Over -1 and 2 μm, the high optical performance of the miniaturized lens 8 of this embodiment is apparent.

Referring to FIG. 17, the miniaturized lens 9 of the ninth preferred embodiment of the present invention also includes a first lens L1 and a second lens arranged along an optical axis Z and sequentially from an object side to an imaging surface Im. L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter CF. Wherein: the first lens L1 is a convex-concave lens having a negative refractive power and made of a plastic material, and the convex surface S1 faces the object side, and the concave surface S2 faces the imaging surface Im, and both surfaces S1 and S2 are aspherical surfaces. Therefore, the miniaturized lens 9 has a wide-angle optical characteristic, and the aspherical design can also effectively correct the distortion problem that the miniaturized lens 9 is likely to occur in wide-angle optical design.

The second lens L2 is a lenticular lens having a positive refractive power and made of a plastic material, and both surfaces S3 and S4 are aspherical surfaces. In addition, the structural design of the convex surface S3 of the second lens L2 toward the object side is also designed to assist the first lens L1 in correcting the distortion problem of the miniaturized lens 9, and simultaneously correct the spherical aberration generated by the first lens L1. Field curvature and reduce the manufacturing sensitivity of the lens L2.

The purpose of the aperture ST being disposed between the second lens L2 and the third lens L3 is the same as that of the foregoing embodiments, in that the angle at which light is incident on the imaging surface Im can be effectively reduced, and the miniaturized lens can be made. 9 The lens design before and after the aperture ST presents a relatively symmetrical design, which can effectively increase the amount of light entering the imaging surface Im, shorten the distance between the imaging surface Im and the lenses L1 to L5, and reduce the manufacturing time. Sensitivity.

The third lens L3 is a lenticular lens having a positive refractive power and made of a plastic material, and both sides S6 and S7 are aspherical surfaces.

The fourth lens L4 is a biconcave lens having a negative refractive power and made of a plastic material, and both sides S8 and S9 are aspherical surfaces. In addition, the design of the refractive power of the third lens L3 and the fourth lens L4 is the same as that of the above embodiments, and the combination of the positive refractive power and the negative refractive power is utilized to achieve the miniaturization of the system.

The fifth lens L5 is a convex-concave lens having a positive refractive power and made of a plastic material, the convex surface S10 faces the object side, and the concave surface S11 faces the imaging surface Im, and its both sides S10, S11 is an aspherical surface. The purpose of the structural design of the fifth lens L5 is to effectively correct the coma aberration and the astigmatism which may occur in the miniaturized lens 9, and to effectively adjust the angle at which the light is incident on the imaging surface Im. The optical performance of the miniaturized lens 9 is improved.

In addition, the miniaturized lens 9 also satisfies the following conditions, so that the miniaturized lens 9 can have a wide angle, a short total system length, and an effect of effectively eliminating the aberration of the miniaturized lens 9: (1) 0.1 < f / TTL < 0.3; (2) 0.8 < | f3 / f4 | < 1.25; (3) Vd3 - Vd4 > 20; where f is the system focal length of the miniaturized lens 9; TTL is the total length of the system of the miniaturized lens 9 F3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; Vd3 is the Abbe's coefficient of the third lens L3; and Vd4 is the Abbe's coefficient of the fourth lens L4.

Furthermore, in order to achieve the above object and effectively improve the optical performance of the miniaturized lens 9, the system focal length f of the miniaturized lens 9 of the ninth preferred embodiment of the present invention, the total system length TTL, and the optical axis Z of each lens surface pass through The radius of curvature R, the distance D between each mirror surface and the next mirror surface (or imaging surface Im) on the optical axis Z, the refractive index Nd of each lens, the Abbe's coefficient Vd of each lens, and the focal length f1~f5 of each lens, As shown in Table 17:

In this embodiment, the aspherical coefficient k of each aspherical surface and the respective order coefficients α ₂ to α _{8 are} as shown in Table 18:

The lens L1 to L5 and the aperture ST are arranged in the above-described manner, so that the miniaturized lens 9 of the present embodiment can also meet the requirements in image quality, which can be seen from FIG. 18A to FIG. 18C, wherein it can be seen from FIG. 18A. The maximum field curvature of the miniaturized lens 9 of the present embodiment does not exceed -0.02 mm and 0.02 mm; as can be seen from FIG. 18B, the maximum distortion of the miniaturized lens 9 of the present embodiment does not exceed -2% and 2%; As can be seen from Fig. 18C, the lateral chromatic aberration of the miniaturized lens 9 of the present embodiment does not exceed -1 and 1 μm. It is apparent that the optical performance of the miniaturized lens 9 of the present embodiment is in compliance with the standard.

The above description is only for the preferred embodiments of the present invention, and is not intended to be limited thereto, and the equivalent structural changes of the present invention and the scope of the claims are intended to be included in the scope of the present invention.

1‧‧‧Small lens

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧ fourth lens

L5‧‧‧ fifth lens

ST‧‧‧ aperture

Z‧‧‧ optical axis

CF‧‧‧Filter

Im‧‧‧ imaging surface

S1~S13‧‧‧Mirror

Claims (22)

A miniaturized lens comprising: an object side to an image forming surface and sequentially arranged along an optical axis: a first lens is a convex and concave lens having a negative refractive power, and a convex surface thereof faces the object side, and the concave surface faces The second lens has a positive refractive power, and the mirror surface facing the object side is convex; an aperture; a third lens is a lenticular lens having a positive refractive power; and a fourth lens is a negative refractive power A double concave lens; and a fifth lens, the mirror surface facing the object side is convex. The miniaturized lens of claim 1, wherein at least one mirror surface of the first lens is an aspherical surface. The miniaturized lens of claim 1, wherein the first lens is made of a plastic material. The miniaturized lens of claim 1, wherein the first lens is made of a glass material. The miniaturized lens of claim 1, wherein the mirror surface of the second lens facing the imaging surface is convex. The miniaturized lens of claim 1, wherein the second lens is made of a plastic material and at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the second lens is made of a glass material and at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the second lens is made of a glass material and at least one mirror surface is a spherical surface. The miniaturized lens of claim 1, wherein the third lens is made of a plastic material, and at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the third lens is made of a glass material and at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the third lens is made of a glass material and at least one mirror surface is a spherical surface. The miniaturized lens of claim 1, wherein the fourth lens is made of a plastic material and at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the fourth lens is made of a glass material. And at least one mirror surface is an aspherical surface. The miniaturized lens of claim 1, wherein the fourth lens is made of a glass material and at least one mirror surface is a spherical surface. The miniaturized lens of claim 1, wherein the third lens faces the mirror surface of the imaging surface and the mirror surface of the four lenses toward the object side. The miniaturized lens of claim 1, wherein the fifth lens is a lens having positive refractive power. The miniaturized lens of claim 1, wherein the fifth lens is a lens having a negative refractive power. The miniaturized lens of claim 1, wherein the fifth lens is a convex-concave lens, and the mirror surface facing the imaging surface is concave. The miniaturized lens of claim 1, wherein the fifth lens is made of a plastic material and at least one mirror surface is an aspherical surface. The miniaturized lens according to claim 1 further satisfies the following condition: 0.1 < f / TTL < 0.3; wherein f is the system focal length of the miniaturized lens; TTL is the total system length of the miniaturized lens. The miniaturized lens according to claim 1 further satisfies the following condition: 0.8<| f3/f4 |<1.25; wherein f3 is the focal length of the third lens; and f4 is the focal length of the fourth lens. The miniaturized lens according to claim 1 further satisfies the following condition: Vd3-Vd4>20; wherein Vd3 is the Abbe's coefficient of the third lens; and Vd4 is the Abbe's coefficient of the fourth lens.