CN105700112B - The electronic installation of optical imaging lens and the application optical imaging lens - Google Patents
The electronic installation of optical imaging lens and the application optical imaging lens Download PDFInfo
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Abstract
The invention relates to a kind of optical lens.The present invention disclose a kind of optical imaging lens sequentially included along an optical axis from thing side to image side one first lens, an aperture, one second and third, four, five lens, each lens all have a thing side and an image side surface；The optical imaging lens meet (T1+T3)/Gaa≤1.2.Invention additionally discloses a kind of electronic installation, include a casing, an and image module in the casing, the image module includes a foregoing optical imaging lens, a lens barrel for being used to set for the optical imaging lens, one is used for the module rear seat unit that is set for the lens barrel, and an image sensor for being arranged at the optical imaging lens image side.The present invention is used for optical photography.
Description
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 module related technologies, the image module mainly includes components such as an optical imaging lens, a module backseat unit (module holder unit), and a sensor (sensor), and the miniaturization demand of the image module is increasing due to the trend of the slim and lightweight mobile phones and digital cameras. However, the most important characteristics of an optical lens are not limited to the imaging quality and volume.
Japanese patent No. JP5397538 and taiwan area patent publication No. TW201305651 both disclose an optical lens system composed of five lenses, wherein distances on an optical axis from an object side surface of a first lens to an image plane are both large, so that a system length of the optical lens system cannot be effectively reduced to a certain length, thereby satisfying design requirements for thinning a mobile phone and a digital camera.
In summary, the technical difficulty of the miniaturized lens is significantly higher than that of the conventional lens, so how to manufacture an optical lens meeting the requirements of consumer electronic products and continuously improve the imaging quality thereof has been a goal earnestly pursued by various circles in the field for a long time.
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, an aperture stop, 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 have refractive indexes and respectively 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 positioned in a peripheral nearby area, and the image side surface of the first lens is provided with a convex surface part positioned in an optical axis nearby area; the second lens is made of plastic; the object side surface of the third lens is provided with a concave surface part positioned in the area near the circumference; the fourth lens element with positive refractive index has a concave surface portion located in a region near an optical axis on the object-side surface; and the object side surface of the fifth lens is provided with a convex surface part positioned in an area near an optical axis and a concave surface part positioned in an area near the circumference.
The optical imaging lens comprises only five lenses with refractive indexes, the thickness of the first lens on the optical axis is T1, the thickness of the third lens on the optical axis is T3, the sum of four air gaps of the first lens to the fifth lens on the optical axis is Gaa, and the sum of (T1+ T3)/Gaa ≧ 1.2 is satisfied.
The optical imaging lens has the beneficial effects that: by the concave-convex shape design and arrangement of the object side surface or the image side surface of the lens, the optical imaging lens still has the optical performance of effectively overcoming the aberration under the condition of shortening the system length, and provides better imaging quality.
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: by loading the image module with the optical imaging lens in the electronic device, the 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 can be 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 embodiments thereof, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram illustrating a face structure of a lens;
FIG. 2 is a schematic view illustrating a surface type concave-convex structure of a lens and a light focus;
FIG. 3 is a schematic view illustrating a face structure of a lens according to an example I;
FIG. 4 is a schematic diagram illustrating a second exemplary lens configuration;
FIG. 5 is a schematic view illustrating a surface structure of a lens according to a third exemplary embodiment;
FIG. 6 is a schematic configuration diagram illustrating a first embodiment of an optical imaging lens according to the present invention;
FIG. 7 is a diagram of longitudinal spherical aberration and various aberrations of the first embodiment;
FIG. 8 is a table diagram illustrating optical data for each lens of the first embodiment;
FIG. 9 is a table diagram illustrating aspherical coefficients of the lenses of the first embodiment;
FIG. 10 is a schematic configuration diagram illustrating a second embodiment of an optical imaging lens according to the present invention;
FIG. 11 is a diagram of longitudinal spherical aberration and various aberrations of the second embodiment;
FIG. 12 is a table diagram illustrating optical data for each lens of the second embodiment;
FIG. 13 is a table diagram illustrating aspherical coefficients of the lenses of the second embodiment;
FIG. 14 is a schematic configuration diagram illustrating a third embodiment of an optical imaging lens according to the invention; FIG. 15 is a longitudinal spherical aberration and various aberrations diagram of the third embodiment;
FIG. 16 is a table diagram illustrating optical data for each lens of the third embodiment;
FIG. 17 is a table diagram illustrating aspherical coefficients of the lenses of the third embodiment;
FIG. 18 is a schematic configuration diagram illustrating a fourth embodiment of an optical imaging lens according to the invention;
FIG. 19 is a longitudinal spherical aberration and various aberrations diagram of the fourth embodiment;
FIG. 20 is a table diagram illustrating optical data for each lens of the fourth embodiment;
FIG. 21 is a table diagram illustrating aspherical coefficients of the lenses of the fourth embodiment;
FIG. 22 is a schematic configuration diagram illustrating a fifth embodiment of an optical imaging lens according to the invention;
FIG. 23 is a longitudinal spherical aberration and various aberrations diagram of the fifth embodiment;
FIG. 24 is a table diagram illustrating optical data for each lens of the fifth embodiment;
fig. 25 is a table diagram illustrating aspherical coefficients of the lenses of the fifth embodiment;
FIG. 26 is a schematic configuration diagram illustrating a sixth embodiment of an optical imaging lens according to the invention;
FIG. 27 is a longitudinal spherical aberration and various aberrations diagram of the sixth embodiment;
FIG. 28 is a table diagram illustrating optical data for each lens of the sixth embodiment;
fig. 29 is a table diagram illustrating aspherical coefficients of the lenses of the sixth embodiment;
FIG. 30 is a schematic configuration diagram illustrating a seventh embodiment of an optical imaging lens according to the invention;
FIG. 31 is a longitudinal spherical aberration and various aberrations diagram of the seventh embodiment;
FIG. 32 is a table diagram illustrating optical data for each lens of the seventh embodiment;
fig. 33 is a table diagram illustrating aspherical coefficients of the lenses of the seventh embodiment;
fig. 34 is a table diagram illustrating optical parameters of the first to seventh embodiments of the five-piece optical imaging lens;
fig. 35 is a table diagram illustrating optical parameters of the first to seventh embodiments of the five-piece optical imaging lens;
FIG. 36 is a schematic cross-sectional view illustrating a first embodiment of an electronic device in accordance with the present invention; and
fig. 37 is a schematic cross-sectional view illustrating an electronic device according to a second embodiment of the invention.
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 a positive refractive index (or a negative refractive index)" means that the refractive index of the lens element on the optical axis calculated by the gaussian optical theory is positive (or negative). The image side surface and the object side surface are defined as a range through which imaging light passes, wherein the imaging light includes a chief ray (chief ray) Lc and a marginal ray (marginal ray) Lm, as shown in fig. 1, I is an optical axis, and the lens is radially symmetrical with the optical axis I as a symmetry axis, a region on the optical axis through which light passes is an area a near the optical axis, and a region through which marginal light passes is an area C near the circumference. More specifically, the following methods are used to determine the surface shape, the area near the optical axis, the area near the circumference, or the ranges of a plurality of areas:
1. fig. 1 is a cross-sectional view of a lens in the radial direction. When the area is judged, a central point is defined as an intersection point of the lens surface and the optical axis I, and a conversion point is a point on the lens surface and a tangent line passing through the point is vertical to the optical axis. If there are several conversion points radially outwards, the first conversion point and the second conversion point are in turn, and the conversion point farthest from the optical axis in the radial direction on the effective radius is the Nth conversion point. The range between the central point and the first conversion point is an area near the optical axis, the area radially outward of the Nth conversion point is an area near the circumference, and different areas can be distinguished according to the conversion points in the middle. Further, the effective radius is the perpendicular distance from the intersection of the marginal ray Lm with the lens surface to the optical axis I.
2. As shown in fig. 2, the shape irregularities of the region are determined on the image side or the object side at the intersection point of the light beam (or the light beam extension line) passing through the region in parallel with the optical axis I (light beam focus determination method). For example, when the light passes through the region, the light is focused toward the image side, and the focal point of the optical axis is located at the image side, such as the R point in fig. 2, the region is a convex surface. On the contrary, if the light passes through the certain region, the light diverges, and the extension line and the focal point of the optical axis are on the object side, for example, at point M in fig. 2, the region is a concave surface portion, so that a convex surface portion is formed between the central point and the first transition point, and the region radially outward of the first transition point is a concave surface portion; as can be seen from fig. 2, the transition point is a boundary point between the convex surface portion and the concave surface portion, so that the region and the region radially adjacent to the inner side of the region can be defined to have different surface shapes with the transition point as a boundary. In addition, the determination of the surface shape in the region near the optical axis I can be determined by a method of determination by those skilled in the art, in which the irregularity is determined as positive or negative of an R value (which refers to a curvature radius of a paraxial region, and generally refers to an R value on a lens database (lens data) in optical software). When the R value is positive, the object side is judged to be a convex surface part, and when the R value is negative, the object side is judged to be a concave surface part; in the case of the image side surface, when the R value is positive, it is determined as a concave surface portion, and when the R value is negative, it is determined as a convex surface portion, and the unevenness determined by this method is determined in the same manner as the light focus determination.
3. If there is no transition point on the lens surface, the area near the optical axis I is defined as 0-50% of the effective radius, and the area near the circumference is defined as 50-100% of the effective radius.
Referring to fig. 3, the image-side surface of the lens of example one has only the first transition point on the effective radius, and the first zone is the area around the optical axis I and the second zone is the area around the circumference. The R value of the image side surface of the lens is positive, so that the area near the optical axis I is judged to have a concave surface part; the surface shape of the circumferential vicinity is different from the inner side area immediately radially adjacent to the circumferential vicinity. That is, the surface shapes of the area near the circumference and the area near the optical axis I are different; the peripheral region has a convex portion.
Referring to fig. 4, the object-side surface of the lens of example two has a first and a second transition point on the effective radius, and the first zone is the region near the optical axis I and the third zone is the region near the circumference. The R value of the object side surface of the lens is positive, so that the area near the optical axis is judged to be a convex surface part; the region (second region) between the first transition point and the second transition point has a concave surface portion, and the region (third region) near the circumference has a convex surface portion.
Referring to fig. 5, the object-side surface of the lens of example three has no transition point on the effective radius, and the effective radius is 0% to 50% of the area around the optical axis I and 50% to 100% of the area around the circumference. The R value of the area near the optical axis I is positive, so that the object side surface is provided with a convex surface part in the area near the optical axis I; there is no transition point between the area near the circumference and the area near the optical axis I, so the area near the circumference has a convex surface portion.
Referring to fig. 6 and 8, the optical imaging lens 10 according to the first embodiment of the present invention 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 9. 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 9, an Image is formed on an Image Plane 100(Image Plane). The Filter 9 is an infrared Filter (IR Cut Filter) for preventing infrared rays in the light from transmitting to the image plane 100 to affect the image quality. It should be noted that the object side is toward the object to be photographed, and the image side is toward the imaging plane 100.
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 9 each have an object-side surface 31, 41, 51, 61, 71, 91 facing the object side and allowing the imaging light to pass therethrough, and an image-side surface 32, 42, 52, 62, 72, 92 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 of the product, the first lens element 3 to the fifth lens element 7 are all made of plastic material with refractive index, but the materials of the first lens element 3, the third lens element 5, the fourth lens element 6 and the fifth lens element 7 are not limited thereto.
The first lens element 3 has a positive refractive index. The object-side surface 31 of the first lens element 3 is a convex surface, and has a convex portion 311 located in the vicinity of the optical axis I and a convex portion 312 located in the vicinity of the circumference, and the image-side surface 32 of the first lens element 3 is a convex surface, and has a convex portion 321 located in the vicinity of the optical axis I and a convex portion 322 located in the vicinity of the circumference.
The second lens element 4 has a negative refractive index. The object-side surface 41 of the second lens element 4 is a concave surface and has a concave portion 411 located in the vicinity of the optical axis I and a concave portion 412 located in the vicinity of the circumference, and the image-side surface 42 of the second lens element 4 has a concave portion 421 located in the vicinity of the optical axis I and a convex portion 422 located in the vicinity of the circumference.
The third lens element 5 has a negative refractive index, the object-side surface 51 of the third lens element 5 has a convex portion 511 located in a region near the optical axis I and a concave portion 512 located in a region near the circumference, and the image-side surface 52 of the third lens element 5 has a concave portion 521 located in a region near the optical axis I and a convex portion 522 located in a region near the circumference.
The fourth lens element 6 has a positive refractive index. The object-side surface 61 of the fourth lens element 6 is concave and has a concave portion 611 located in the vicinity of the optical axis I and a concave portion 612 located in the vicinity of the circumference, and the image-side surface 62 of the fourth lens element 6 is convex and has a convex portion 621 located in the vicinity of the optical axis I and a convex portion 622 located in the vicinity of the circumference.
The fifth lens element 7 has a negative refractive index. 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 and a concave portion 712 located in the vicinity of the circumference, and the image-side surface 72 of the fifth lens element 7 has a concave portion 721 located in the vicinity of the optical axis and a convex portion 722 located in the vicinity of the circumference.
In the first embodiment, only the lens elements have refractive indexes.
Other detailed optical data of the first embodiment is shown in fig. 8, and the overall system focal length (EFL) of the first embodiment is 2.21mm, half field of view (HFOV) is 38.8974 °, aperture value (Fno) is 2.2, and the system length is 3.333 mm. The system length is a distance from the object side surface 31 of the first lens element 3 to the image plane 100 on the optical axis I.
In addition, the object-side surfaces 31, 41, 51, 61, 71 and the image-side surfaces 32, 42, 52, 62, 72 of the first lens element 3, the second lens element 4, the third lens element 5, the fourth lens element 6, and the fifth lens element 7 are aspheric surfaces, which are defined by the following formulas:
wherein:
y: the distance between a point on the aspheric curve and the optical axis I;
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);
r is the curvature radius of the lens surface;
k: cone constant (conc constant);
a2i: aspheric coefficients of order 2 i.
The aspheric coefficients of the object side surface 31 of the first lens 3 to the image side surface 72 of the fifth lens 7 in the formula (1) are shown in fig. 9. In fig. 9, the field number 31 indicates that it is an aspheric coefficient of the object-side surface 31 of the first lens 3, and so on.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the first embodiment.
Wherein,
t1 is the thickness of the first lens 3 on the optical axis I;
t2 is the thickness of the second lens 4 on the optical axis I;
t3 is the thickness of the third lens 5 on the optical axis I;
t4 is the thickness of the fourth lens 6 on the optical axis I;
t5 is the thickness of the fifth lens 7 on the optical axis I;
g12 is an air gap on the optical axis I between the first lens 3 and 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 between the third lens 5 and the fourth lens 6;
g45 is an air gap on the optical axis I between the fourth lens 6 and the fifth lens 7;
gaa is the sum of five air gaps on the optical axis I of the first lens 3 to the fifth lens 7, i.e., the sum of G12, G23, G34, G45;
ALT is the sum of thicknesses of the first lens 3, the second lens 4, the third lens 5, the fourth lens 6, and the fifth lens 7 on the optical axis I, i.e., the sum of T1, T2, T3, T4, T5;
TTL is the distance from the object-side surface 31 of the first lens element 3 to the image plane 100 on the optical axis I;
BFL is the distance from the image-side surface 72 of the fifth lens element 7 to the image plane 100 on the optical axis I; and
the EFL is the system focal length of the optical imaging lens 10.
In addition, redefining:
G5F is an air gap on the optical axis I between the fifth lens 7 and the filter 9;
TF is the thickness of the filter 9 on the optical axis I;
GFP is the air gap on the optical axis I between the filter 9 and the image plane 100;
f1 is the focal length of the first lens 3;
f2 is the focal length of the second lens 4;
f3 is the focal length of the third lens 5;
f4 is the focal length of the fourth lens 6;
f5 is the focal length of the fifth lens 7;
n1 is the refractive index of the first lens 3;
n2 is the refractive index of the second lens 4;
n3 is the refractive index of the third lens 5;
n4 is the refractive index of the fourth lens 6;
n5 is the refractive index of the fifth lens 7;
ν 1 is Abbe number (Abbe number) of the first lens 3, which can also be referred to as Abbe number;
ν 2 is an abbe coefficient of the second lens 4;
ν 3 is an abbe coefficient of the third lens 5;
ν 4 is an abbe coefficient of the fourth lens 6; and
ν 5 is an abbe number of the fifth lens 7.
Referring to fig. 7, the drawings of (a) illustrate longitudinal spherical aberration (longitudinal spherical aberration) of the first embodiment, and the drawings of (b) and (c) illustrate astigmatic aberration (tangential aberration) of the first embodiment in sagittal direction and astigmatic aberration in meridional direction on the image plane 100, respectively, and the drawings of (d) illustrate distortion aberration (rotational aberration) of the first embodiment on the image plane 100. In the longitudinal spherical aberration diagram of the first embodiment shown in fig. 7(a), the curves formed by each wavelength are very close and close to the middle, which means that the off-axis light beams with different heights of each wavelength are all concentrated near the imaging point, and the deviation of the curves of each wavelength is observed, and the deviation of the imaging points of the off-axis light beams with different heights is controlled within the range of ± 0.01mm, so that the embodiment can obviously improve the spherical aberration with the same wavelength.
In the two astigmatic aberration diagrams of FIGS. 7(b) and 7(c), the variation of the focal lengths of the three representative wavelengths over the entire field of view is within. + -. 0.02mm, indicating that the optical system of the first embodiment can effectively eliminate the aberrations. The distortion aberration diagram of fig. 7(d) shows that the distortion aberration of the first embodiment is maintained within a range of ± 2.5%, which indicates that the distortion aberration of the first embodiment meets the imaging quality requirement of the optical system, and thus the first embodiment can provide better imaging quality under the condition that the system length is shortened to 3.333mm compared with the conventional optical lens, so that the first embodiment can shorten the lens length and enlarge the shooting angle under the condition of maintaining good optical performance, thereby realizing thinner product design.
Referring to fig. 10, a second embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, and only the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, and 7 are slightly different. Note here that, in fig. 10, the same reference numerals of the concave surface portion and the convex surface portion as those of the first embodiment are omitted for clarity of illustration.
The detailed optical data is shown in fig. 12, and the overall system focal length of this second embodiment is 2.21mm, half field of view (HFOV) is 38.8163 °, aperture value (Fno) is 2.2, and system length is 3.383 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 the formula (1) are shown.
In addition, the relationship between the important parameters in the optical imaging lens 10 of the second embodiment is shown in fig. 34 and 35.
Referring to fig. 11, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), and the distortion aberration of (c), and the figure of (d) that the second embodiment can maintain good optical performance.
As can be seen from the above description, the advantages of the second embodiment over the first embodiment are: the second embodiment is easier to manufacture than the first embodiment and therefore has a higher yield.
Referring to fig. 14, a third embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, 7 are more or less different, and the object-side surface 61 of the fourth lens element 6 has a concave portion 611 located in the vicinity of the optical axis I and a convex portion 613 located in the vicinity of the circumference. Note here that, in order to clearly show the drawing, reference numerals of the concave surface portion and the convex surface portion which are the same as those of the first embodiment are omitted in fig. 14.
The detailed optical data is shown in fig. 16, and the overall system focal length of the third embodiment is 2.21mm, the half field angle (HFOV) is 38.9252 °, the aperture value (Fno) is 2.2, and the system length is 3.235 mm.
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 the formula (1) are shown.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the third embodiment.
Referring to fig. 15, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), and the distortion aberration of (c), and the figure of (d) that the third embodiment can maintain good optical performance.
As can be seen from the above description, the third embodiment has the following advantages over the first embodiment: the system length of the third embodiment is smaller than that of the first embodiment, the half-viewing angle of the third embodiment is larger than that of the first embodiment, and the third embodiment is easier to manufacture than the first embodiment and therefore has higher yield.
Referring to fig. 18, a fourth embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, and only the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, and 7 are slightly different. Note here that, in fig. 18, the same reference numerals of the concave surface portion and the convex surface portion as those of the first embodiment are omitted for clarity of illustration.
The detailed optical data is shown in fig. 20, and the overall system focal length of the fourth embodiment is 2.21mm, the half field angle (HFOV) is 38.89997 °, the aperture value (Fno) is 2.2, and the system length is 3.195 mm.
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 the formula (1) are shown.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the fourth embodiment.
Referring to fig. 19, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberrations of (b) and (c), and the distortion aberration of (d) that the fourth embodiment can maintain good optical performance.
As can be seen from the above description, the advantages of the fourth embodiment over the first embodiment are: the system length of the fourth embodiment is smaller than that of the first embodiment, the half-viewing angle of the fourth embodiment is larger than that of the first embodiment, and the fourth embodiment is easier to manufacture than the first embodiment and therefore has higher yield.
Referring to fig. 22, a fifth embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, 7 are more or less different, and the object-side surface 61 of the fourth lens element 6 has a concave portion 611 located in the vicinity of the optical axis I and a convex portion 613 located in the vicinity of the circumference. Note here that, in order to clearly show the drawing, reference numerals of the concave surface portion and the convex surface portion which are the same as those of the first embodiment are omitted in fig. 22.
The detailed optical data is shown in fig. 24, and the overall system focal length of the fifth embodiment is 2.21mm, the half field angle (HFOV) is 38.8915 °, the aperture value (Fno) is 2.2, and the system length is 3.344 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 the formula (1) are shown.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the fifth embodiment.
Referring to fig. 23, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), and the distortion aberration of (c), and the figure of (d) that the fifth embodiment can maintain good optical performance.
As can be seen from the above description, the advantages of the fifth embodiment over the first embodiment are: the fifth embodiment is easier to manufacture than the first embodiment and therefore has a higher yield.
Referring to fig. 26, a sixth embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, 7 are more or less different, and the object-side surface 61 of the fourth lens element 6 has a concave portion 611 located in the vicinity of the optical axis I and a convex portion 613 located in the vicinity of the circumference. Note here that, in order to clearly show the drawing, reference numerals of the concave surface portion and the convex surface portion which are the same as those of the first embodiment are omitted in fig. 26.
The detailed optical data is shown in fig. 28, and the overall system focal length of the sixth embodiment is 2.21mm, the half field angle (HFOV) is 39.0488 °, the aperture value (Fno) is 2.2, and the system length is 3.314 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 the formula (1) are shown in the sixth embodiment.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the sixth embodiment.
Referring to fig. 27, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberrations of (b) and (c), and the distortion aberration of (d) that the sixth embodiment can maintain good optical performance.
As can be seen from the above description, the advantages of the sixth embodiment over the first embodiment are: the system length of the sixth embodiment is smaller than that of the first embodiment, the half viewing angle of the sixth embodiment is larger than that of the first embodiment, and the imaging quality of the sixth embodiment is also better than that of the first embodiment, and finally the sixth embodiment is easier to manufacture than the first embodiment and therefore has higher yield.
Referring to fig. 30, a seventh embodiment of the optical imaging lens system 10 of the present invention is substantially similar to the first embodiment, except that the optical data, aspheric coefficients and parameters of the lenses 3, 4, 5, 6, and 7 are more or less different, and the object-side surface 61 of the fourth lens element 6 has a concave portion 611 located in the vicinity of the optical axis I and a convex portion 613 located in the vicinity of the circumference. Note here that, in order to clearly show the drawing, reference numerals of the concave surface portion and the convex surface portion which are the same as those of the first embodiment are omitted in fig. 30.
The detailed optical data is shown in fig. 32, and the overall system focal length of the seventh embodiment is 2.21mm, the half field angle (HFOV) is 38.9129 °, the aperture value (Fno) is 2.2, and the system length is 3.262 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 the formula (1) are shown in the seventh embodiment.
Fig. 34 and 35 show relationships between important parameters in the optical imaging lens 10 according to the seventh embodiment.
Referring to fig. 31, it can be seen from the longitudinal spherical aberration of (a), the astigmatic aberration of (b), and the distortion aberration of (c), that the seventh embodiment can maintain good optical performance.
As can be seen from the above description, the advantages of the seventh embodiment over the first embodiment are: the system length of the seventh embodiment is smaller than that of the first embodiment, the half-viewing angle of the seventh embodiment is larger than that of the first embodiment, and the seventh embodiment is easier to manufacture than the first embodiment and therefore has a higher yield.
Referring to fig. 34 and 35, which are table diagrams of optical parameters of the seven embodiments, when the relationship among the optical parameters in the optical imaging lens 10 of the present invention satisfies the following conditional expressions, the optical performance still has better performance 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:
in order to achieve the reduction of the system length of the optical imaging lens 10, the lens thickness and the air gap between the lenses are designed to be as small as possible in the composition design of the optical imaging lens 10, but in consideration of the difficulty of the lens combination, the air gap between the lenses can be generally reduced to a smaller extent than the thickness of the lenses, so that the following conditional expressions can be satisfied, and the optical imaging lens 10 can be preferably configured. T/G ≦ 1.8, T/G ≦ 8.5, T/G ≦ 1.5, (T + T)/G ≦ 2.4, (T + T)/G ≦ 7, (T + T)/G ≦ 6.5, (T + T)/G ≦ 8, (T + T)/G ≦ 16, ALT/G ≦ 51, ALT/G ≦ 19, preferably, 1.3 ≦ T/G ≦ 1.8, 1.7 ≦ T/G ≦ 8.5, 0.8 ≦ T/G ≦ 1.4, 1.5 ≦ (T + T)/G ≦ 2.4, 3.5 ≦ (T + T)/G ≦ 6.0, 4.0 ≦ (T + T)/G ≦ 6.0, 4.5 ≦ T/G ≦ 8.0, 10.0 ≦ T/G ≦ 10.0, T + T/G ≦ 10.0/G ≦.
As mentioned above, although the lens thickness should be reduced, the total Gaa of the air gaps between the lenses should be maintained in a proper ratio in consideration of the difficulty of lens assembly, so that the following conditional expressions can be satisfied, and the optical imaging lens 10 can be configured in a preferable manner. (T1+ T3)/Gaa ≧ 1.2, preferably 1.2 ≦ (T1+ T3)/Gaa ≦ 1.4.
Third, although the thickness of the fourth lens element 6 can be reduced to a greater extent than the air gap between the lens elements, the refractive index of the fourth lens element 6 is positive, and the effective optical diameter is larger, so that the thickness of the fourth lens element 6 can be reduced to a smaller extent, and the optical imaging lens system 10 can have a better imaging effect when the length is shorter if the following conditional expressions are satisfied. (G34+ G45)/T4 ≦ 0.75, preferably 0.1 ≦ (G34+ G45)/T4 ≦ 0.6.
Fourthly, since the object-side surface 61 of the fourth lens element 6 is a concave surface 611 in the vicinity of the optical axis I, the air gap G34 between the third lens element 5 and the fourth lens element 6 on the optical axis I can be designed to be large, and the reduction width of G34 is small compared to the total Gaa of the air gaps between the lens elements, so that the length of the optical imaging lens 10 can be reduced if the following conditional expressions are satisfied. Gaa/G34 ≦ 5, preferably 3.0 ≦ Gaa/G34 ≦ 4.5.
As described above, G34 can be reduced by a smaller amount than the air gap G23 between the second lens element 4 and the third lens element 5 on the optical axis I, so that the length of the optical imaging lens 10 can be reduced if the following conditional expressions are satisfied. G23/G34 ≦ 2.3, preferably 1.0 ≦ G23/G34 ≦ 2.5.
Sixth, in the process of reducing the length of the optical imaging lens system 10, since the refractive index of the fourth lens element 6 is positive and the optical effective diameter thereof is larger, the thickness T4 of the fourth lens element can be reduced to a smaller extent than the thickness T2 of the second lens element 4, and the optical imaging lens system 10 can be configured better if the following conditional expressions are satisfied. T2/T4 ≦ 0.5, preferably 0.2 ≦ T2/T4 ≦ 0.5.
Seventh, as the length of the optical imaging lens 10 is shortened, the effective focal length EFL of the optical imaging lens 10 is reduced, if the following conditional expression is satisfied, the distance BFL between the image side 72 of the fifth lens element 7 and the imaging plane 100 on the optical axis I falls within a suitable range, so that the optical imaging lens 10 has better effect. EFL/BFL is less than or equal to 2.65, preferably, EFL/BFL is less than or equal to 2.65.
However, in view of the unpredictability of the optical system design, the configuration of the present invention preferably enables the optical imaging lens system 10 of the present invention to have a shorter length, a smaller aperture, an increased field angle, an improved imaging quality, or an improved assembly yield, thereby improving the drawbacks of the prior art.
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 convex portion 312 of the object-side surface 31 of the first lens element 3 in the area near the circumference and the convex portion 321 of the image-side surface 32 of the first lens element 3 in the area near the optical axis I can effectively focus light, and the aperture 2 located between the first lens element 3 and the second lens element 4 is helpful to enlarge the field of view of the optical imaging lens system 10.
Second, by the concave surface 512 of the object-side surface 51 of the third lens element 5 in the area near the circumference, the concave surface 611 of the fourth lens element 6 with positive refractive index and the object-side surface 61 in the area near the optical axis I, curvature of field and distortion can be eliminated, and imaging aberration can be reduced. The convex part 711 of the object-side surface 71 of the fifth lens element 7 in the area near the optical axis I and the concave part 712 in the area near the circumference are matched with each other to correct the incident angle of the light entering the image plane, and the matching of the surface types of the above lens elements can ensure the imaging quality of the optical imaging lens assembly 10. The second lens 4 is made of plastic material, which is beneficial to reducing the manufacturing cost and the weight.
Third, the present invention makes the whole system have better capability of eliminating aberration, such as spherical aberration, by controlling the related design parameters, and then matches the concave-convex shape design and arrangement of the object side surface 31, 41, 51, 61, 71 or the image side surface 32, 42, 52, 62, 72 of the lenses 3, 4, 5, 6, 7, so that the optical imaging lens 10 still has the optical performance capable of effectively overcoming chromatic aberration under the condition of shortening the system length, and provides better imaging quality.
Fourthly, the design of the optical imaging lens 10 of the present invention is shown from the foregoing description of seven embodiments, the system length of these embodiments can be shortened to less than 3.5mm, and compared with the existing optical imaging lens, the lens of the present invention can be applied to manufacture thinner products, so that the present invention has economic benefits meeting market requirements.
Referring to fig. 36, in a first embodiment of the electronic device 1 applying 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 100 (see fig. 6) 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. 37, a second embodiment of an electronic device 1 applying the optical imaging lens 10 is shown, and the main differences between the second embodiment and the electronic device 1 of the first 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 filter 9 is disposed on the image sensor rear seat 122. Other component structures of the second embodiment of the electronic device 1 are similar to those of the electronic device 1 of the first 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 embodiment and the second embodiment of the electronic device 1 can be relatively reduced, so as to manufacture thinner products, and good optical performance and imaging quality can still be provided, so that the electronic device 1 of the invention not only has the economic benefit of reducing the consumption of the shell raw materials, but also can meet the design trend and consumption requirements of light, thin and short products.
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 (17)
1. An optical imaging lens sequentially comprises a first lens, an aperture, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the first lens to the fifth lens have refractive indexes and respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;
the object side surface of the first lens is provided with a convex surface part positioned in a peripheral nearby area, and the image side surface of the first lens is provided with a convex surface part positioned in an optical axis nearby area;
the second lens is made of plastic material, and the object side surface of the second lens is provided with a concave surface part positioned in the area near the optical axis;
the object side surface of the third lens is provided with a concave surface part positioned in the area near the circumference;
the fourth lens element with positive refractive index has a concave surface portion located in a region near an optical axis on the object-side surface; and
the object side surface of the fifth lens is provided with a convex surface part positioned in an area near an optical axis and a concave surface part positioned in an area near the circumference;
the optical imaging lens comprises only five lenses with refractive indexes, the thickness of the first lens on the optical axis is T1, the thickness of the third lens on the optical axis is T3, the sum of four air gaps of the first lens to the fifth lens on the optical axis is Gaa, and the sum of (T1+ T3)/Gaa ≧ 1.2 is satisfied.
2. The optical imaging lens of claim 1, characterized in that: the second lens has a thickness T2 on the optical axis, the fourth lens has a thickness T4 on the optical axis, and the following conditional expressions are also satisfied: T2/T4 ≦ 0.5.
3. The optical imaging lens of claim 2, characterized in that: the sum of the thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element on the optical axis is ALT, the air gap between the fourth lens element and the fifth lens element on the optical axis is G45, and the following conditional expressions are also satisfied: ALT/G45 ≦ 51.
4. The optical imaging lens of claim 3, characterized in that: an air gap between the third lens and the fourth lens on the optical axis is G34, and the following conditional expression is also satisfied: (T1+ T2)/G34 ≦ 7.0.
5. The optical imaging lens of claim 1, characterized in that: the second lens has a thickness of T2 on the optical axis, an air gap of G12 on the optical axis between the first lens and the second lens, and the following conditional expressions are also satisfied: (T1+ T2)/G12 ≦ 16.
6. The optical imaging lens of claim 5, wherein: an air gap between the second lens and the third lens on the optical axis is G23, and the following conditional expression is also satisfied: T3/G23 ≦ 1.5.
7. The optical imaging lens of claim 6, characterized in that: the sum of the thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element on the optical axis is ALT, the air gap between the third lens element and the fourth lens element on the optical axis is G34, and the following conditional expressions are also satisfied: ALT/G34 ≦ 19.
8. The optical imaging lens of claim 1, characterized in that: the thickness of the fourth lens on the optical axis is T4, the air gap between the third lens and the fourth lens on the optical axis is G34, the air gap between the fourth lens and the fifth lens on the optical axis is G45, and the following conditional expressions are also satisfied: (G34+ G45)/T4 ≦ 0.75.
9. The optical imaging lens of claim 8, wherein: an air gap between the second lens and the third lens on the optical axis is G23, and the following conditional expression is also satisfied: G23/G34 ≦ 2.3.
10. The optical imaging lens of claim 1, characterized in that: the thickness of the fifth lens on the optical axis is T5, the air gap between the second lens and the third lens on the optical axis is G23, and the following conditional expression is also satisfied: T5/G23 ≦ 1.8.
11. The optical imaging lens of claim 10, wherein: an air gap between the third lens and the fourth lens on the optical axis is G34, and the following conditional expression is also satisfied: (T1+ T5)/G34 ≦ 8.
12. The optical imaging lens of claim 11, characterized in that: the system focal length of the optical imaging lens is EFL, the distance between the image side surface of the fifth lens and an imaging surface on the optical axis is BFL, and the following conditional expressions are also satisfied: EFL/BFL ≦ 2.65.
13. The optical imaging lens of claim 1, characterized in that: an air gap between the third lens and the fourth lens on the optical axis is G34, and the following conditional expression is also satisfied: Gaa/G34 ≦ 5.
14. The optical imaging lens of claim 13, wherein: the thickness of the fifth lens on the optical axis is T5, the air gap between the fourth lens and the fifth lens on the optical axis is G45, and the following conditional expression is also satisfied: T5/G45 ≦ 8.5.
15. The optical imaging lens of claim 1, characterized in that: the second lens has a thickness T2 on the optical axis, an air gap G23 on the optical axis between the second lens and the third lens, and the following conditional expressions are also satisfied: (T2+ T3)/G23 ≦ 2.4.
16. The optical imaging lens of claim 15, wherein: an air gap between the third lens and the fourth lens on the optical axis is G34, and the following conditional expression is also satisfied: (T1+ T3)/G34 ≦ 6.5.
17. 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 16, 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.
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