CN103676103B - Optical imaging lens and apply the electronic installation of this camera lens - Google Patents

Abstract

The present invention discloses a kind of optical imaging lens and applies the electronic installation of this camera lens.This optical imaging lens sequentially comprises one first, one second, 1 the 3rd, one the 4th from thing side to image side, and one the 5th lens.This thing side of these the first lens has the convex surface part that is positioned at optical axis near zone.These the second lens are the lens of positive refractive index, and this thing side has the convex surface part that is positioned at optical axis near zone.This thing side of 3rd lens has the concave part that is positioned at optical axis near zone.The material of the 5th lens is plastics, and the concave part that this image side mask has to be positioned at optical axis near zone.The Abbe number of these first and second lens is respectively V1, V2, and the formula that satisfies condition: 25≤| V1-V2|.This electronic installation, comprise a casing and and be arranged on image module in this casing, this image module comprises above-mentioned optical imaging lens, a lens barrel, a module rear seat unit and an image sensor.The present invention makes this camera lens shorten the optical property still had under length.

Description

Optical imaging lens and electronic device using same

Technical Field

The present invention relates to an optical lens, and more particularly, to an optical imaging lens and an electronic device using the same.

Background

In recent years, the popularization of portable electronic products such as mobile phones and digital cameras has led to the rapid development of image modules (mainly including optical imaging lenses, modules such as backseat units and sensors), and the trend of slim and lightweight mobile phones and digital cameras has led to an increasing demand for miniaturization of image modules.

In U.S. patent publication nos. 20100253829, 20110316969, 20100254029, 7480105, and japanese patent publication nos. 2010-026434 and 2010-008562, all of them are five-piece lens structures, and the total air gap between the lenses is too large.

The lens length disclosed in U.S. patent publication No. 20110316969 is more than 14mm, which is not favorable for the thin design of portable electronic products such as mobile phones and digital cameras.

The imaging lens disclosed in the above patent has a longer lens length, which is not suitable for the demand of the miniaturization of the mobile phone, so there is still room for improvement.

Disclosure of Invention

Therefore, an object of the present invention is to provide an optical imaging lens capable of maintaining good optical performance even when the length of the lens system is shortened.

The optical imaging lens of the present invention sequentially includes, along an optical axis from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, where the first lens element to the fifth lens element include an object side surface facing the object side and allowing the imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough.

The object side surface of the first lens is provided with a convex surface part located in an area near an optical axis. The second lens element has a positive refractive index, and the object-side surface of the second lens element has a convex surface portion located in a region near the optical axis. The object side surface of the third lens is provided with a concave surface part located in the area near the optical axis. The fifth lens element is made of plastic, and the image-side surface of the fifth lens element has a concave surface portion located in a region near the optical axis. Wherein, the lenses with refractive index only have the first lens to the fifth lens, and the abbe number (abbe number) of the first lens is V1, the abbe number of the second lens is V2, and the following conditional expressions are satisfied: 25 ≦ V1-V2 |.

The optical imaging lens has the beneficial effects that: the object side surface of the first lens is provided with the convex surface part which is positioned in the area near the optical axis, so that the light can be condensed by the optical imaging lens. The second lens element has positive refractive index, which can reduce the manufacturing sensitivity by sharing the refractive index required by the system. The object-side surface of the second lens element has the convex surface portion located in a region near the optical axis, the object-side surface of the third lens element has the concave surface portion located in a region near the optical axis, and the image-side surface of the fifth lens element has the concave surface portion located in a region near the optical axis, which can contribute to correction of aberration. In addition, the fifth lens is made of plastic, so that the manufacturing cost can be reduced, the weight of the optical imaging lens can be reduced, and the length of the imaging lens can be shortened.

Therefore, another object of the present invention is to provide an electronic device applied to the optical imaging lens.

Therefore, the electronic device of the invention comprises a casing and an image module arranged in the casing.

The image module includes an optical imaging lens, a lens barrel for the optical imaging lens, a module rear seat unit for the lens barrel, and an image sensor disposed at an image side of the optical imaging lens.

The electronic device has the beneficial effects that: the electronic device is provided with the image module with the optical imaging lens, so that the optical imaging lens can still provide the advantage of good optical performance under the condition of shortening the system length, and a thinner and lighter electronic device is manufactured under the condition of not sacrificing the optical performance, so that the invention has good practical performance, is beneficial to the structural design of thinning and shortening, and can meet the consumption requirement of higher quality.

Drawings

Other features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram illustrating a lens structure;

FIG. 2 is a schematic configuration diagram illustrating a first preferred embodiment of an optical imaging lens according to the present invention;

FIG. 3 is a diagram of longitudinal spherical aberration and various aberrations of the first preferred embodiment;

FIG. 4 is a table illustrating the optical data for each lens of the first preferred embodiment;

FIG. 5 is a table diagram illustrating aspheric coefficients of the lenses of the first preferred embodiment;

FIG. 6 is a schematic configuration diagram illustrating a second preferred embodiment of an optical imaging lens according to the invention;

FIG. 7 is a diagram of longitudinal spherical aberration and various aberrations of the second preferred embodiment;

FIG. 8 is a table illustrating the optical data for each lens of the second preferred embodiment;

FIG. 9 is a table diagram illustrating aspheric coefficients of the lenses of the second preferred embodiment;

FIG. 10 is a schematic configuration diagram illustrating a third preferred embodiment of an optical imaging lens according to the invention;

FIG. 11 is a longitudinal spherical aberration and aberration diagrams of the third preferred embodiment;

FIG. 12 is a table illustrating the optical data for each lens of the third preferred embodiment;

FIG. 13 is a table diagram illustrating aspheric coefficients of the lenses of the third preferred embodiment;

FIG. 14 is a schematic configuration diagram illustrating a fourth preferred embodiment of an optical imaging lens system according to the invention;

FIG. 15 is a longitudinal spherical aberration and aberration diagrams of the fourth preferred embodiment;

FIG. 16 is a table illustrating the optical data for each lens of the fourth preferred embodiment;

FIG. 17 is a table diagram illustrating aspheric coefficients of the lenses of the fourth preferred embodiment;

FIG. 18 is a schematic configuration diagram illustrating a fifth preferred embodiment of an optical imaging lens according to the invention;

FIG. 19 is a longitudinal spherical aberration and aberration diagrams of the fifth preferred embodiment;

FIG. 20 is a table illustrating the optical data for each lens of the fifth preferred embodiment;

FIG. 21 is a table diagram illustrating aspheric coefficients of the lenses of the fifth preferred embodiment;

FIG. 22 is a schematic configuration diagram illustrating a sixth preferred embodiment of an optical imaging lens according to the invention;

FIG. 23 is a longitudinal spherical aberration and aberration diagrams of the sixth preferred embodiment;

FIG. 24 is a table diagram illustrating the optical data for each lens of the sixth preferred embodiment;

FIG. 25 is a table diagram illustrating aspherical coefficients of the lenses of the sixth preferred embodiment;

FIG. 26 is a schematic configuration diagram illustrating a seventh preferred embodiment of an optical imaging lens system according to the invention;

FIG. 27 is a longitudinal spherical aberration and aberration diagrams of the seventh preferred embodiment;

FIG. 28 is a table illustrating the optical data for each lens of the seventh preferred embodiment;

FIG. 29 is a table diagram illustrating aspherical coefficients of the lenses of the seventh preferred embodiment;

FIG. 30 is a schematic configuration diagram illustrating an eighth preferred embodiment of an optical imaging lens system according to the invention;

FIG. 31 is a longitudinal spherical aberration and aberration diagrams of the eighth preferred embodiment;

FIG. 32 is a table illustrating the optical data for each lens of the eighth preferred embodiment;

FIG. 33 is a table diagram illustrating aspheric coefficients of the lenses of the eighth preferred embodiment;

FIG. 34 is a table diagram illustrating optical parameters of the first to eighth preferred embodiments of the optical imaging lens;

FIG. 35 is a schematic cross-sectional view illustrating a first preferred embodiment of an electronic device according to the invention; and

FIG. 36 is a schematic cross-sectional view illustrating an electronic device according to a second preferred embodiment of the invention.

[ notation ] to show

10 optical imaging lens

2 aperture

3 first lens

31 side of the object

311 convex part

32 image side

4 second lens

41 side of the object

411 convex part

42 image side

5 third lens

51 side of the object

511 concave part

Side surface of 52 figure

521 concave part

522 convex part

6 fourth lens

61 side of the object

62 image side

7 fifth lens

71 side of the object

711 convex part

712 concave part

713 convex part

714 concave part

72 image side

721 concave part

722 convex part

8 optical filter

Side of 81 items

Side of 82 figure

9 image plane

I optical axis

1 electronic device

11 casing

12 image module

120 module backseat unit

121 lens backseat

122 image sensor backseat

123 first base

124 second seat

125 coil

126 magnetic assembly

130 image sensor

21 lens barrel

II, III axes

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same reference numerals.

In the present specification, the term "a lens element having positive refractive power (or negative refractive power)" refers to the lens element having positive refractive power (or negative refractive power) in the vicinity of the optical axis. "the object side surface (or image side surface) of a lens has a convex surface portion (or concave surface portion) in a region" means that the region is more "convex outward" (or "concave inward") in a direction parallel to the optical axis than the region immediately outside the region in the radial direction, taking fig. 1 as an example, where I is the optical axis and such a lens is radially symmetrical to each other with the optical axis I as the axis of symmetry, the object side surface of the lens has a convex surface portion in a region a, a concave surface portion in a region B and a convex surface portion in a region C, because a region a is more convex outward in a direction parallel to the optical axis than the region immediately outside the region in the radial direction (i.e., region B), a region B is more concave inward than region C, and a region C is similarly more convex outward than region E. The "area around the circumference" refers to the area around the circumference of the curved surface of the lens through which only the imaging light passes, i.e. the area C in fig. 1, wherein the imaging light includes a chief ray (chiefly) Lc and a marginal ray (marginally) Lm. The "area near the optical axis" refers to the area near the optical axis of the curved surface through which only the imaging light passes, i.e., the area a in fig. 1. In addition, the lens further includes an extension portion E for assembling the lens in an optical imaging lens, and an ideal imaging light does not pass through the extension portion E, but the structure and shape of the extension portion E are not limited thereto.

Referring to fig. 2 and 4, a first preferred embodiment of the optical imaging lens 10 includes, in order from an object side to an image side along an optical axis I, a first lens element 3, an aperture stop 2, a second lens element 4, a third lens element 5, a fourth lens element 6, a fifth lens element 7, and a filter 8. When light emitted from an object enters the optical imaging lens 10, and passes through the first lens 3, the stop 2, the second lens 4, the third lens 5, the fourth lens 6, the fifth lens 7, and the filter 8, an image is formed on an imaging surface 9 (ImagePlane). The filter 8 is an infrared filter (IRCutFilter) for preventing infrared rays in the light from transmitting to the imaging plane 9 to affect the imaging quality. It should be noted that the object side is a side facing the object to be photographed, and the image side is a side facing the imaging plane 9.

The first lens element 3, the second lens element 4, the third lens element 5, the fourth lens element 6, the fifth lens element 7, and the filter 8 each have an object-side surface 31, 41, 51, 61, 71, 81 facing the object side and allowing the imaging light to pass therethrough, and an image-side surface 32, 42, 52, 62, 72, 82 facing the image side and allowing the imaging light to pass therethrough. The object-side surfaces 31, 41, 51, 61, 71 and the image-side surfaces 32, 42, 52, 62, 72 are aspheric.

In addition, in order to satisfy the requirement of light weight, the first lens element 3 to the fifth lens element 7 are made of plastic material with refractive index, but the material is not limited thereto.

The first lens element 3 is a lens element with negative refractive index, and the object-side surface 31 of the first lens element 3 is a convex surface and has a convex surface portion located in a region near the optical axis I. The image side surface 32 of the first lens element 3 is concave.

The second lens element 4 has a positive refractive index, and the object-side surface 41 of the second lens element 4 is convex and has a convex portion 411 located in a region near the optical axis I. The image-side surface 42 of the second lens element 4 is convex.

The third lens element 5 has a negative refractive index, and the object-side surface 51 of the third lens element 5 is concave and has a concave portion 511 located in a region near the optical axis I. The image-side surface 52 of the third lens element 5 has a concave portion 521 located in the vicinity of the optical axis I and a convex portion 522 located in the vicinity of the circumference.

The fourth lens element 6 with positive refractive index has a concave object-side surface 61 of the fourth lens element 6. The image-side surface 62 of the fourth lens element 6 is convex.

The fifth lens element 7 with negative refractive index has a convex portion 711 near the optical axis I and a concave portion 712 near the circumference of the object-side surface 71 of the fifth lens element 7. The image-side surface 72 of the fifth lens element 7 has a concave portion 721 located in the vicinity of the optical axis I and a convex portion 722 located in the vicinity of the circumference.

Other detailed optical data of the first preferred embodiment is shown in fig. 4, and the overall system focal length (EFL) of the first preferred embodiment is 2.96mm, half view (HFOV) is 43.29 °, aperture value (Fno) is 2.41, abbe number (abbe number) is 4.42mm, and system length (TTL) is 4.42 mm. Wherein the system length is a distance from the object side surface 31 of the first lens element 3 to an image plane 9 on an optical axis I.

In addition, a total of ten surfaces from the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 are aspheric surfaces defined by the following formula:

$Z\left(Y\right)=\frac{Y^2}{R}/(1+\sqrt{1-(1+K)\frac{Y^2}{R^2}})+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{a}_{2i}\×Y^{2i}-----------\left(1\right)$

wherein:

r: the radius of curvature of the lens surface;

z: the depth of the aspheric surface (the vertical distance between a point on the aspheric surface which is Y away from the optical axis I and a tangent plane tangent to the vertex on the optical axis I of the aspheric surface);

y: the vertical distance between a point on the aspheric surface curved surface and the optical axis I;

k: cone coefficient (Conicconstant); and

a_2i: aspheric coefficients of order 2 i.

Aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown in fig. 5.

In addition, the relationship among the important parameters in the optical imaging lens 10 of the first preferred embodiment is as follows:

|V1-V2|=33.01；

ALT/T5=3.73；

CTmin/G34=2.51；

CTmax/T3=3.60；

Dmax/T3=3.60；

T2/G34=4.15；

Gaa/G23=1.42；

T2/AGmax=0.76；

BFL/T2=2.79；

ALT/G23=4.58；

T4/T3=3.60；

BFL/T3=4.63；

T3/G34=2.51；

CTmax/CTmin=3.60；

wherein,

v1 is the abbe number of the first lens 3;

v2 is the abbe number of the second lens 4;

t2 is the central thickness of the second lens 4 on the optical axis I;

t3 is the central thickness of the third lens 5 on the optical axis I;

t4 is the central thickness of the fourth lens 6 on the optical axis I;

t5 is the central thickness of the fifth lens 7 on the optical axis I;

g12 is an air gap on the optical axis I from the first lens 3 to the second lens 4;

g23 is an air gap on the optical axis I between the second lens 4 and the third lens 5;

g34 is an air gap on the optical axis I of the third lens 5 to the fourth lens 6;

CTmin is the smallest lens center thickness of the first lens 3 to the fifth lens 7 on the optical axis I;

CTmax is the maximum lens center thickness of the first lens 3 to the fifth lens 7 on the optical axis I;

AGmax is the largest value among four air gaps on the optical axis I between the first lens 3 and the fifth lens 7;

dmax is the largest of nine values of the central thicknesses of the five lenses and four air gaps between the first lens 3 and the fifth lens 7;

efl (effective focal length) is the system focal length of the optical imaging lens 10;

gaa is the sum of four air gaps on the optical axis I of the first lens 3 to the fifth lens 7;

ALT is a sum of lens center thicknesses on the optical axis I from the first lens 3 to the fifth lens 7;

BFL is the distance from the image-side surface 72 of the fifth lens element 7 to the image plane 9 on the optical axis I; and

TTL is the distance on the optical axis I from the object-side surface 31 of the first lens element 3 to the image plane 9.

Referring to fig. 3, the drawings of (a) illustrate longitudinal spherical aberration (longitudinal spherical aberration) of the first preferred embodiment, and the drawings of (b) and (c) illustrate astigmatic aberration (tangential aberration) of the first preferred embodiment with respect to sagittal direction and meridional direction, respectively, on the imaging plane 9, and the drawings of (d) illustrate distortion aberration (distortion) of the first preferred embodiment on the imaging plane 9. In the longitudinal spherical aberration diagram of the first preferred embodiment shown in fig. 3(a), the curves formed by each wavelength are very close and close to the middle, which means that the off-axis light beams with each wavelength at different heights are all concentrated near the imaging point, and the deviation of the curve of each wavelength is observed, and the deviation of the imaging point of the off-axis light beams with different heights is controlled within the range of ± 0.075mm, so that the embodiment can obviously improve the spherical aberration with the same wavelength, and in addition, the distances between the three representative wavelengths are also controlled within the range of ± 0.02mm, and the imaging positions representing the light beams with different wavelengths are concentrated, thereby obviously improving the chromatic aberration.

In the two astigmatic aberration diagrams of FIG. 3(b) and FIG. 3(c), the variation of the focal length of the three representative wavelengths over the entire field of view is within + -0.15 mm, which illustrates that the optical system of the first preferred embodiment can effectively eliminate the aberration. The distortion aberration diagram of fig. 3(d) shows that the distortion aberration of the first preferred embodiment is maintained within a range of ± 1.9%, which illustrates that the distortion aberration of the first preferred embodiment meets the imaging quality requirement of the optical system, and thus the first preferred embodiment can still provide better imaging quality under the condition that the system length is shortened to 4.42mm compared with the conventional optical lens, so that the first preferred embodiment can shorten the lens length to realize thinner product design under the condition of maintaining good optical performance.

Referring to fig. 6, a second preferred embodiment of the optical imaging lens 10 of the present invention is substantially similar to the first preferred embodiment.

Detailed optical data is shown in fig. 8, the overall system focal length of the second preferred embodiment is 2.95mm, the half field angle (HFOV) is 44.20 °, the aperture value (Fno) is 2.41, and the system length (TTL) is 4.40 mm.

As shown in fig. 9, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens 10 of the second embodiment is as follows:

|V1-V2|=32.85；

ALT/T5=6.10；

CTmin/G34=2.18；

CTmax/T3=3.49；

Dmax/T3=3.49；

T2/G34=3.38；

Gaa/G23=2.27；

T2/AGmax=0.80；

BFL/T2=2.67；

ALT/G23=4.38；

T4/T3=3.49；

BFL/T3=4.12；

T3/G34= 2.19; and

CTmax/CTmin=3.50。

referring to fig. 7, it can be seen from the drawings of the longitudinal spherical aberration of (a), (b), (c), and (d), that the curves of the three representative wavelengths of the longitudinal spherical aberration obtained by the second preferred embodiment are relatively close to each other, and the second preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the second preferred embodiment is also within the range of ± 0.15mm, and the distortion aberration thereof is also maintained within the range of ± 1.9%, which can provide better imaging quality under the condition that the system length is shortened to 4.40mm, so that the second preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Referring to fig. 10, a third preferred embodiment of an optical imaging lens 10 according to the present invention is substantially similar to the first preferred embodiment, wherein the third preferred embodiment is mainly different from the first preferred embodiment in that: the object-side surface 71 of the fifth lens element 7 has a convex portion 711 located in the vicinity of the optical axis I, a convex portion 713 located in the vicinity of the circumference, and a concave portion 714 located between the optical axis I and the vicinity of the circumference.

Detailed optical data as shown in fig. 12, the overall system focal length of the third preferred embodiment is 3.03mm, the half field of view (HFOV) is 42.74 °, the aperture value (Fno) is 2.60, and the system length (TTL) is 4.37 mm.

As shown in fig. 13, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens system 10 of the third preferred embodiment is as follows:

|V1-V2|=32.85；

ALT/T5=5.96；

CTmin/G34=2.07；

CTmax/T3=3.52；

Dmax/T3=3.52；

T2/G34=3.42；

Gaa/G23=1.80；

T2/AGmax=0.59；

BFL/T2=3.34；

ALT/G23=3.37；

T4/T3=3.52；

BFL/T3=4.85；

T3/G34= 2.36; and

CTmax/CTmin=4.00。

referring to fig. 11, it can be seen from the drawings of the longitudinal spherical aberration of (a), (b), (c), and (d) and the distortion aberration thereof that the curves of the three representative wavelengths of the longitudinal spherical aberration obtained in the third preferred embodiment are relatively close to each other, and the third preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the astigmatism aberration obtained by the third preferred embodiment in the entire field angle range is also within the range of ± 0.15mm, and the distortion aberration thereof is also maintained within the range of ± 2.5%, which can also provide better imaging quality under the condition that the system length is shortened to 4.37mm, so that the third preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Fig. 14 shows a fourth preferred embodiment of the optical imaging lens system 10 according to the present invention, which is substantially similar to the first preferred embodiment.

Detailed optical data as shown in fig. 16, the focal length of the system is 3.27mm, the half field angle (HFOV) is 41.46 °, the aperture value (Fno) is 2.60, and the system length (TTL) is 4.67mm in the fourth preferred embodiment.

As shown in fig. 17, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens system 10 of the fourth preferred embodiment is as follows:

|V1-V2|=33.01；

ALT/T5=4.48；

CTmin/G34=0.74；

CTmax/T3=3.68；

Dmax/T3=3.68；

T2/G34=1.54；

Gaa/G23=1.85；

T2/AGmax=0.93；

BFL/T2=3.40；

ALT/G23=4.58；

T4/T3=3.68；

BFL/T3=7.02；

T3/G34= 0.74; and

CTmax/CTmin=3.68。

referring to fig. 15, it can be seen from the drawings that the longitudinal spherical aberration (a), the astigmatic aberration (b), and the distortion aberration (d) are similar to the first preferred embodiment, and the obtained curves of the three representative wavelengths of the longitudinal spherical aberration are also very close to each other. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the fourth preferred embodiment is also within the range of ± 0.1mm, and the distortion aberration thereof is also maintained within the range of ± 2.5%, which can also provide better imaging quality under the condition that the system length is shortened to 4.67mm, so that the fourth preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Fig. 18 shows a fifth preferred embodiment of the optical imaging lens system 10 according to the present invention, which is substantially similar to the first preferred embodiment.

Detailed optical data as shown in fig. 20, the focal length of the system is 3.00mm, the half field angle (HFOV) is 43.69 °, the aperture value (Fno) is 2.41, and the system length (TTL) is 4.46mm in this fifth preferred embodiment.

As shown in fig. 21, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens system 10 of the fifth preferred embodiment is as follows:

|V1-V2|=32.00；

ALT/T5=4.82；

CTmin/G34=1.41；

CTmax/T3=4.09；

Dmax/T3=4.09；

T2/G34=2.76；

Gaa/G23=1.58；

T2/AGmax=0.91；

BFL/T2=3.16；

ALT/G23=4.80；

T4/T3=4.09；

BFL/T3=6.21；

T3/G34= 1.41; and

CTmax/CTmin=4.09。

referring to fig. 19, it can be seen from the drawings of the longitudinal spherical aberration of (a), (b), (c), and (d), that the curves of the three representative wavelengths of the longitudinal spherical aberration obtained by the fifth preferred embodiment are relatively close to each other, and the fifth preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the fifth preferred embodiment is also within the range of ± 0.12mm, and the distortion aberration thereof is also maintained within the range of ± 2.5%, which can also provide better imaging quality under the condition that the system length is shortened to 4.46mm, so that the fifth preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Fig. 22 shows a sixth preferred embodiment of the optical imaging lens system 10 according to the present invention, which is substantially similar to the first preferred embodiment.

Detailed optical data as shown in fig. 24, the overall system focal length of the sixth preferred embodiment is 3.02mm, the half field angle (HFOV) is 43.60 °, the aperture value (Fno) is 2.41, and the system length (TTL) is 4.71 mm.

As shown in fig. 25, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens system 10 of the sixth preferred embodiment is as follows:

|V1-V2|=34.82；

ALT/T5=4.55；

CTmin/G34=2.60；

CTmax/T3=4.02；

Dmax/T3=4.02；

T2/G34=4.62；

Gaa/G23=1.69；

T2/AGmax=1.45；

BFL/T2=2.60；

ALT/G23=8.45；

T4/T3=4.02；

BFL/T3=4.62；

T3/G34= 2.60; and

CTmax/CTmin=4.02。

referring to fig. 23, it can be seen from the drawings of the longitudinal spherical aberration of (a), (b), (c), and (d) and the distortion aberration that the curves of the three representative wavelengths of the longitudinal spherical aberration obtained by the sixth preferred embodiment are relatively close to each other, and the sixth preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the sixth preferred embodiment is also within the range of ± 0.2mm, and the distortion aberration thereof is also maintained within the range of ± 1.25%, which can also provide better imaging quality under the condition that the system length is shortened to 4.71mm, so that the sixth preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Fig. 26 shows a seventh preferred embodiment of the optical imaging lens system 10 according to the present invention, which is substantially similar to the first preferred embodiment.

Detailed optical data is shown in fig. 28, the overall system focal length of the seventh preferred embodiment is 2.95mm, the half field of view (HFOV) is 44.89 °, the aperture value (Fno) is 2.41, and the system length (TTL) is 4.40 mm.

As shown in fig. 29, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship among the important parameters in the optical imaging lens system 10 of the seventh preferred embodiment is as follows:

|V1-V2|=32.85；

ALT/T5=4.88；

CTmin/G34=2.52；

CTmax/T3=2.93；

Dmax/T3=2.93；

T2/G34=3.36；

Gaa/G23=1.48；

T2/AGmax=0.78；

BFL/T2=3.59；

ALT/G23=4.64；

T4/T3=2.93；

BFL/T3=4.80；

T3/G34= 2.52; and

CTmax/CTmin=2.93。

referring to fig. 27, it can be seen from the drawings that the longitudinal spherical aberration (a), the astigmatic aberration (b), and the distortion aberration (d) show the same longitudinal spherical aberration, the three wavelength curves of the longitudinal spherical aberration are relatively close to each other, and the seventh preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the seventh preferred embodiment is also within the range of ± 0.15mm, and the distortion aberration thereof is also maintained within the range of ± 2.5%, which can also provide better imaging quality under the condition that the system length is shortened to 4.40mm, so that the seventh preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Fig. 30 shows an eighth preferred embodiment of the optical imaging lens system 10 according to the present invention, which is substantially similar to the first preferred embodiment.

Detailed optical data as shown in fig. 32, the overall system focal length of the eighth preferred embodiment is 3.10mm, the half field angle (HFOV) is 42.59 °, the aperture value (Fno) is 2.41, and the system length (TTL) is 4.73 mm.

As shown in fig. 33, the aspheric coefficients of the object-side surface 31 of the first lens element 3 to the image-side surface 72 of the fifth lens element 7 in formula (1) are shown.

In addition, the relationship between the important parameters in the optical imaging lens system 10 of the eighth preferred embodiment is as follows:

|V1-V2|=34.82；

ALT/T5=4.75；

CTmin/G34=2.52；

CTmax/T3=4.09；

Dmax/T3=4.09；

T2/G34=5.50；

Gaa/G23=1.62；

T2/AGmax=1.60；

BFL/T2=2.25；

ALT/G23=7.82；

T4/T3=4.09；

BFL/T3=4.93；

T3/G34= 2.52; and

CTmax/Ctmin=4.09。

referring to fig. 31, it can be seen from the drawings of the longitudinal spherical aberration of (a), (b), (c), and (d) and the distortion aberration that the curves of the three representative wavelengths of the longitudinal spherical aberration obtained by the eighth preferred embodiment are relatively close to each other, and the eighth preferred embodiment also effectively eliminates the longitudinal spherical aberration and has significantly improved chromatic aberration. The variation of the focal length of the three representative wavelengths in the entire field angle range of the astigmatic aberration obtained by the eighth preferred embodiment is also within the range of ± 0.2mm, and the distortion aberration thereof is also maintained within the range of ± 2.5%, which can also provide better imaging quality under the condition that the system length is shortened to 4.73mm, so that the eighth preferred embodiment can also shorten the lens length under the condition of maintaining good optical performance, thereby being beneficial to the design of thin products.

Referring to fig. 34, a table diagram of optical parameters of the eight preferred embodiments is shown, when the relationship between the optical parameters in the optical imaging lens 10 of the present invention satisfies the following conditional expressions, the optical performance will still be better under the condition of shortened system length, so that when the present invention is applied to a related portable electronic device, a thinner product can be manufactured:

25≦|V1-V2|--------------------------(2)

ALT/T5≦6.1--------------------------(3)

CTmin/G34≦3.3---------------------(4)

2.8≦CTmax/T3-----------------------(5)

2.8≦Dmax/T3------------------------(6)

T2/G34≦5.5--------------------------(7)

Gaa/G23≦2.5-------------------------(8)

T2/AGmax≦1.6----------------------(9)

2.5≦BFL/T2------------------------(10)

ALT/G23≦9.0-----------------------(11)

2.9≦T4/T3--------------------------(12)

3.0≦BFL/T3------------------------(13)

T3/G34≦2.6-------------------------(14)

2.8≦CTmax/CTmin-----------------(15)

in the process of shortening the optical imaging lens 10, the chromatic aberration is more serious, and when the conditional expression (2) is satisfied, the lens has better chromatic aberration elimination capability. This conditional expression may be limited by an upper limit: 25 ≦ V1-V2| ≦ 38.

During the shortening of the optical imaging lens 10, the total thickness of all the lenses is reduced, and since the fifth lens element 7 has a larger optical effective diameter, the shortening ratio is limited, so that both ALT and T5 satisfy the condition (3). In addition, this conditional expression may be limited by the following limitations: 3.0 ≦ ALT/T5 ≦ 6.1.

In the process of shortening the optical imaging lens 10, all the lenses become thinner and the smallest thickness of the five lenses must become smaller, so both CTmin and G34 satisfy the conditional expression (4). Preferably, the CTmin/G34 ≦ 2.9 is satisfied. In addition, this conditional expression may be limited by the following limitations: 0.3 ≦ CTmin/G34 ≦ 3.3.

Since the third lens element 5 has a small optical effective diameter and can be reduced at a large scale, both CTmax and T3 satisfy the conditional expression (5). In addition, this conditional expression may be limited by an upper limit: 2.8 ≦ CTmax/T3 ≦ 4.5.

Since the third lens element 5 has a small optical effective diameter and can be reduced at a large scale, both Dmax and T3 satisfy the conditional expression (6). In addition, this conditional expression may be limited by an upper limit: 2.8 ≦ Dmax/T3 ≦ 4.5.

In the process of shortening the optical imaging lens 10, the T2 and the G34 are both smaller, and the second lens element 4 has positive refractive index, but the effective optical diameter is smaller, so the ratio of the second lens element 4 that can be shortened is still larger than that of the G34, and therefore the better configuration is provided when the condition (7) is satisfied. In addition, this conditional expression may be limited by the following limitations: 1.0 ≦ T2/G34 ≦ 5.5.

In the process of shortening the optical imaging lens 10, Gaa and G23 are smaller, but Gaa is the total of four air gaps between the first lens element 3 and the fifth lens element 7, so that the ratio of reduction is larger because three air gaps except G23 can be reduced, and G23 has a smaller ratio because the object-side surface 51 of the third lens element 5 has the concave portion 511 in the vicinity of the optical axis I, so that Gaa and G23 satisfy the conditional expression (8). In addition, this conditional expression may be limited by the following limitations: 1.0 ≦ Gaa/G23 ≦ 2.5.

In the process of shortening the optical imaging lens 10, T2 and AGmax, which is the largest among the four air gaps, are smaller, and the second lens element 4 has a positive refractive index, but since the effective optical diameter is smaller, the ratio of the second lens element 4 that can be reduced is still larger than AGmax, so that a better configuration can be obtained when the condition (9) is satisfied. In addition, this conditional expression may be limited by the following limitations: 0.3 ≦ T2/AGmax ≦ 1.6.

BFL is the distance between the image-side surface 72 of the fifth lens element 7 and the image plane 9 on the optical axis I, and cannot be reduced without limitation in consideration of the difficulty of manufacturing, and the second lens element 4 has a positive refractive index, but the ratio of reduction of the second lens element 4 is still larger than BFL because the optical effective diameter thereof is small, so that both BFL and T2 satisfy the conditional expression (10). In addition, this conditional expression may be limited by an upper limit: 2.5 ≦ BFL/T2 ≦ 4.0.

In the process of shortening the optical imaging lens 10, the total thickness of all the lenses is reduced, and because the object-side surface 51 of the third lens element 5 has the concave portion 511 in the vicinity of the optical axis I, G23 can be shortened at a smaller rate, so that both ALT and G23 satisfy the condition (11). In addition, this conditional expression may be limited by the following limitations: 3.0 ≦ ALT/G23 ≦ 9.0.

Since the third lens element 5 has a small optical effective diameter and can be made thin, and the fourth lens element 6 has a large optical effective diameter and can be made thick and can be manufactured easily, both T3 and T4 satisfy the conditional expression (12). In addition, this conditional expression may be limited by an upper limit: 2.9 ≦ T4/T3 ≦ 4.5.

BFL is the distance between the image-side surface 72 of the fifth lens element 7 and the image-forming surface 9 on the optical axis I, so that it cannot be reduced without limitation in consideration of the difficulty of manufacturing, and the third lens element 5 has a smaller optical effective diameter, so that the third lens element 5 can be reduced at a larger ratio than BFL, so that both BFL and T3 satisfy the conditional expression (13). Preferably, and satisfies 3.6 ≦ BFL/T3. In addition, this conditional expression may be limited by an upper limit: 3.0 ≦ BFL/T3 ≦ 8.0.

Since the optical effective diameter of the third lens element 5 is small, the reduction ratio is still large, and both T3 and G34 satisfy the conditional expression (14). In addition, this conditional expression may be limited by the following limitations: 0.3 ≦ T3/G34 ≦ 2.6.

In the process of shortening the optical imaging lens 10, both CTmax and CTmin become smaller, but considering optical performance and ease of manufacturing, there is a preferable configuration when this conditional expression (15) is satisfied. In addition, this conditional expression may be limited by an upper limit: 2.8 ≦ CTmax/CTmin ≦ 4.5.

In summary, the optical imaging lens 10 of the present invention can achieve the following effects and advantages, so as to achieve the objectives of the present invention:

first, the object side surface 31 of the first lens element 3 has the convex surface portion 311 located in the vicinity of the optical axis I, which helps the optical imaging lens 10 to focus light.

Second, the second lens element 4 has a positive refractive index, which can balance the refractive index required by the system and reduce the manufacturing sensitivity.

Third, the object-side surface 41 of the second lens element 4 has the convex portion 411 located in the vicinity of the optical axis I, the object-side surface 51 of the third lens element 5 has the concave portion 511 located in the vicinity of the optical axis I, and the image-side surface 72 of the fifth lens element 7 has the concave portion 721 located in the vicinity of the optical axis I, which can contribute to aberration correction.

Fourth, the material of the fifth lens element 7 is plastic, which can reduce the manufacturing cost and the weight of the optical imaging lens 10.

Through the control of relevant design parameters, such as | V1-V2|, ALT/T5, CTmin/G34, CTmax/T3, Dmax/T3, T2/G34, Gaa/G23, T2/AGmax, BFL/T2, ALT/G23, T4/T3, BFL/T3, T3/G34, CTmax/CTmin and other parameters, the whole system has better capability of eliminating aberrations, such as spherical aberration, and the optical imaging lens 10 still has optical performance capable of effectively overcoming chromatic aberration under the condition of shortening the length of the system by matching the concave-convex shape design and arrangement of the lenses 3, 4, 5, 6, 7 object sides 31, 41, 51, 61, 71 or image sides 32, 42, 52, 62, 72.

Sixth, the above description of the eight preferred embodiments shows the design of the optical imaging lens 10 of the present invention, and the system length of the preferred embodiments can be shortened to within 5mm, compared with the conventional optical imaging lens, the lens of the present invention can be used to manufacture thinner products, so that the present invention has economic benefits meeting the market requirements.

Referring to fig. 35, in order to illustrate a first preferred embodiment of the electronic device 1 using the optical imaging lens 10, the electronic device 1 includes a housing 11 and an image module 12 installed in the housing 11. The electronic device 1 is described herein by way of example only as a mobile phone, but the type of the electronic device 1 is not limited thereto.

The image module 12 includes the optical imaging lens 10, a lens barrel 21 for accommodating the optical imaging lens 10, a module rear seat unit 120 for accommodating the lens barrel 21, and an image sensor 130 disposed on the image side of the optical imaging lens 10. The image plane 9 (see fig. 2) is formed on the image sensor 130.

The module rear seat unit 120 has a lens rear seat 121 and an image sensor rear seat 122 disposed between the lens rear seat 121 and the image sensor 130. The lens barrel 21 and the lens backseat 121 are coaxially disposed along an axis ii, and the lens barrel 21 is disposed inside the lens backseat 121.

Referring to fig. 36, a second preferred embodiment of the electronic device 1 applying the optical imaging lens 10 is shown, and the main differences between the second preferred embodiment and the electronic device 1 of the first preferred embodiment are: the module backseat unit 120 is of a Voice Coil Motor (VCM) type. The lens rear seat 121 has a first seat 123 attached to the outer side of the lens barrel 21 and disposed along an axis iii, a second seat 124 disposed along the axis iii and surrounding the outer side of the first seat 123, a coil 125 disposed between the outer side of the first seat 123 and the inner side of the second seat 124, and a magnetic component 126 disposed between the outer side of the coil 125 and the inner side of the second seat 124.

The first seat 123 of the lens rear seat 121 can carry the lens barrel 21 and the optical imaging lens 10 disposed in the lens barrel 21 to move along the axis iii. The image sensor rear base 122 is attached to the second base 124. The infrared filter 8 is disposed on the image sensor rear seat 122. The other component structures of the second preferred embodiment of the electronic device 1 are similar to those of the electronic device 1 of the first preferred embodiment, and are not described herein again.

By installing the optical imaging lens 10, since the system length of the optical imaging lens 10 can be effectively shortened, the thicknesses of the first preferred embodiment and the second preferred embodiment of the electronic device 1 can be relatively reduced to manufacture a thinner product, and good optical performance and imaging quality can still be provided. Therefore, the electronic device 1 of the present invention not only has the economic benefit of reducing the consumption of the raw materials of the housing, but also can meet the design trend of light, thin, short and small products and the consumption demand.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

1. An optical imaging lens includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element, wherein the first lens element to the fifth lens element include an object side surface facing the object side and allowing an imaging light to pass therethrough and an image side surface facing the image side and allowing the imaging light to pass therethrough:

the object side surface of the first lens is provided with a convex surface part positioned in an area near an optical axis;

the second lens is a lens with positive refractive index, and the object side surface of the second lens is provided with a convex surface part positioned in an area near an optical axis;

the object side surface of the third lens is provided with a concave surface part positioned in an area near an optical axis; and

the fifth lens element with negative refractive index is made of plastic, and the image side surface of the fifth lens element has a concave surface portion located in the region near the optical axis;

wherein, the lenses with refractive index only have the first lens element to the fifth lens element, an air gap is formed between the first lens element and the second lens element, the abbe number of the first lens element is V1, the abbe number of the second lens element is V2, the total central thickness of all the lenses on the optical axis from the first lens element to the fifth lens element is ALT, the central thickness of the fifth lens element on the optical axis is T5, and the following conditional expressions are satisfied: 25 ≦ V1-V2|, and ALT/T5 ≦ 6.1.

2. The optical imaging lens assembly as claimed in claim 1, wherein the image side surface of the second lens element has a convex surface portion located in a region near an optical axis, an air gap on the optical axis from the third lens element to the fourth lens element is G34, a minimum lens center thickness on the optical axis from the first lens element to the fifth lens element is CTmin, and the following conditions are satisfied: CTmin/G34 ≦ 3.3.

3. The optical imaging lens of claim 2, wherein the maximum central thickness of the first lens element to the fifth lens element on the optical axis is CTmax, the central thickness of the third lens element on the optical axis is T3, and the following conditions are satisfied: 2.8 ≦ CTmax/T3.

4. The optical imaging lens assembly as claimed in claim 1, wherein the image-side surface of the second lens element has a convex surface portion located in a region near the optical axis, the largest of nine values of the central thicknesses of the five optical axes between the first lens element and the fifth lens element and four air gaps is Dmax, the central thickness of the third lens element is T3, and the following conditions are satisfied: 2.8 ≦ Dmax/T3.

5. The optical imaging lens of claim 4, wherein the second lens has a center thickness of T2 on the optical axis, and an air gap of G34 on the optical axis from the third lens to the fourth lens, and satisfies the following conditions: T2/G34 ≦ 5.5.

6. The optical imaging lens of claim 1, wherein the image-side surface of the second lens element has a convex surface portion located in a region near an optical axis, the total of four air gaps on the optical axis from the first lens element to the fifth lens element is Gaa, the air gap on the optical axis from the second lens element to the third lens element is G23, and the following conditions are satisfied: Gaa/G23 ≦ 2.5.

7. The optical imaging lens of claim 6, wherein the second lens element has a center thickness T2 on the optical axis, and the maximum value of four air gaps on the optical axis between the first lens element and the fifth lens element is AGmax, and the following conditions are satisfied: T2/AGmax ≦ 1.6.

8. The optical imaging lens of claim 7, wherein the distance between the image-side surface of the fifth lens element and an imaging surface on the optical axis is BFL, and the following condition is satisfied: 2.5 ≦ BFL/T2.

9. The optical imaging lens assembly as claimed in claim 1, further comprising an aperture stop located between the image-side surface of the first lens element and the object-side surface of the second lens element, the image-side surface of the second lens element having a convex surface portion located in a region near an optical axis, an air gap on the optical axis from the second lens element to the third lens element being G23, and satisfying the following condition: ALT/G23 ≦ 9.0.

10. The optical imaging lens of claim 9, wherein the fourth lens element has a center thickness T4 on the optical axis, and the third lens element has a center thickness T3 on the optical axis, and the following conditional expressions are satisfied: 2.9 ≦ T4/T3.

11. The optical imaging lens of claim 10, wherein the distance between the image-side surface of the fifth lens element and an imaging surface on the optical axis is BFL, and the following condition is satisfied: 3.0 ≦ BFL/T3.

12. The optical imaging lens of claim 1, wherein the image side surface of the second lens element has a convex surface portion located in a region near an optical axis, the third lens element has a center thickness T3 on the optical axis, an air gap G34 on the optical axis from the third lens element to the fourth lens element satisfies the following condition: T3/G34 ≦ 2.6.

13. The optical imaging lens assembly of claim 12, wherein the object side surface of the fifth lens element has a convex surface portion located in a region near an optical axis.

14. The optical imaging lens of claim 13, wherein the maximum central thickness of the first lens element to the fifth lens element on the optical axis is CTmax, the minimum central thickness of the first lens element to the fifth lens element on the optical axis is CTmin, and the following conditions are satisfied: 2.8 ≦ CTmax/CTmin.

15. An electronic device, comprising:

a housing; and

an image module installed in the housing and including an optical imaging lens according to any one of claims 1 to 14, a lens barrel for the optical imaging lens, a module rear seat unit for the lens barrel, and an image sensor disposed on an image side of the optical imaging lens.