CN111435189B - Optical imaging lens group, imaging device and electronic device - Google Patents
Optical imaging lens group, imaging device and electronic device Download PDFInfo
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- CN111435189B CN111435189B CN201910025304.6A CN201910025304A CN111435189B CN 111435189 B CN111435189 B CN 111435189B CN 201910025304 A CN201910025304 A CN 201910025304A CN 111435189 B CN111435189 B CN 111435189B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention provides an optical imaging lens group, an imaging device and an electronic device. The optical imaging lens assembly sequentially comprises an aperture, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power and a fifth lens with negative refractive power from an object side to an image side. The object side surface of the first lens is a convex surface; the object side surface and the image side surface of the second lens are both concave surfaces; the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, and at least one inflection point is arranged at the off-axis position; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the image side surface of the fifth lens is concave and is provided with at least one point of inflexion at the off-axis position. When the optical imaging lens group meets specific conditions, the total length of the whole system can be effectively shortened and good imaging effect can be provided.
Description
Technical Field
The present invention relates to an optical imaging device, and more particularly, to an optical imaging lens assembly for a portable electronic device, and an imaging device and an electronic device having the optical imaging lens assembly.
Background
With the progress of semiconductor manufacturing technology, the size of the photosensitive elements (such as CCD and CMOS Image Sensor) required by the Camera device can be reduced and meet the requirement of Miniaturized Camera devices, and thus the development trend of mounting Miniaturized Camera devices on consumer electronic products to increase the added value of the products is driven. Taking a portable electronic device such as a mobile phone as an example, because of its portability, consumers nowadays use a mobile phone to take pictures instead of using a conventional digital camera. However, consumers increasingly demand portable electronic devices, and in addition to aesthetic appearance, demand smaller and lighter portable electronic devices. Therefore, this trend makes the small-sized camera device mounted on the portable electronic device further miniaturized in overall size so as to be able to be accommodated in the electronic product with a thin, light and small profile.
In addition, the requirement of the consumer for the imaging quality of the small-sized camera device is gradually increased, the traditional specification is difficult to meet the consumer demand, the large-angle, large-aperture and miniaturization are the current development trend, and the most difficult to overcome such demand is the deterioration of the image quality caused by the large-aperture and large-angle stray light and the difficulty in the manufacturing process.
Disclosure of Invention
In view of the above, the present invention provides an optical imaging lens assembly including, in order from an object side to an image side, an aperture stop, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface and an image-side surface, and the object-side surface is convex; the second lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the third lens element with positive refractive power has a convex object-side surface and a concave image-side surface, and the image-side surface has at least one inflection point on an off-axis; the fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the fifth lens element with negative refractive power comprises an object-side surface and an image-side surface, wherein the object-side surface is convex, the image-side surface is concave, and the image-side surface has at least one inflection point on an off-axis position; the object side surfaces and the image side surfaces of the first lens element to the fifth lens element are aspheric surfaces; the optical imaging lens group satisfies the following conditions:
0.8<V2/V3<1.1；
0.3< (V2+ V3)/(V4+ V5) < 0.45; and
0<(CT2+AT2+CT3)/TA<0.25；
wherein V2 is an abbe number of the second lens element, V3 is an abbe number of the third lens element, V4 is an abbe number of the fourth lens element, V5 is an abbe number of the fifth lens element, CT2 is a thickness of the second lens element on an optical axis, CT3 is a thickness of the third lens element on the optical axis, AT2 is a distance between an image-side surface of the second lens element and an object-side surface of the third lens element on the optical axis, and TA is a distance between an object-side surface of the first lens element and an image-side surface of the fifth lens element on the optical axis.
According to an embodiment of the present invention, the focal length of the first lens element is f1, and the focal length of the second lens element is f2, and the optical imaging lens assembly satisfies the following conditions:
1.5<|f2/f1|<2.6。
according to an embodiment of the present invention, the optical imaging lens assembly satisfies the following conditions:
1.7<|f2/f1|<2.4。
according to an embodiment of the present invention, the effective focal length of the optical imaging lens assembly is f, and the curvature radius of the object-side surface of the fourth lens element is R7, the optical imaging lens assembly satisfies the following conditions:
1<f/|R7|<1.55。
according to an embodiment of the present invention, the radii of curvature of the object-side surface and the image-side surface of the second lens element are R3 and R4, respectively, and the optical imaging lens assembly satisfies the following conditions:
-0.5<(R3+R4)/(R3-R4)<0.5。
according to an embodiment of the present invention, a combined focal length of the third lens element and the fourth lens element is f34, and the optical imaging lens assembly satisfies the following conditions:
0.85<f34/f<1。
the invention further provides an imaging device comprising the optical imaging lens group.
The invention further provides an electronic device comprising the imaging device.
Other effects and embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1A is a schematic view of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 1B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion aberration diagram of the first embodiment of the present invention from left to right in sequence;
FIG. 2A is a schematic view of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 2B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion aberration diagram of a second embodiment of the present invention from left to right in sequence;
FIG. 3A is a schematic view of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 3B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion aberration diagram of a third embodiment of the invention from left to right in sequence;
FIG. 4A is a schematic view of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 4B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion aberration diagram of a fourth embodiment of the invention from left to right in sequence;
FIG. 5A is a schematic view of an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 5B is a longitudinal spherical aberration diagram, an astigmatic aberration diagram and a distortion aberration diagram of a fifth embodiment of the invention from left to right.
Description of the symbols
10. 20, 30, 40, 50 optical imaging lens group
11. 21, 31, 41, 51 first lens
12. 22, 32, 42, 52 second lens
13. 23, 33, 43, 53 third lens
14. 24, 34, 44, 54 fourth lens
15. 25, 35, 45, 55 fifth lens
11a, 21a, 31a, 41a, 51a first lens
11b, 21b, 31b, 41b, 51b, the image-side surface of the first lens element
12a, 22a, 32a, 42a, 52a second lens
12b, 22b, 32b, 42b, 52b second lens
13a, 23a, 33a, 43a, 53a third lens element
13b, 23b, 33b, 43b, 53b, the image side of the third lens
14a, 24a, 34a, 44a, 54a fourth lens
14b, 24b, 34b, 44b, 54b, an image side surface of the fourth lens
15a, 25a, 35a, 45a, 55a fifth lens element
15b, 25b, 35b, 45b, 55b, an image side surface of the fifth lens element
16. 26, 36, 46, 56 filter assembly
17. 27, 37, 47, 57 image plane
I optical axis ST aperture
100. 200, 300, 400, 500 electron photosensitive assembly
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
The optical imaging lens assembly of the invention sequentially comprises an aperture stop, a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side.
In the embodiment of the invention, each lens comprises an object side surface facing the object to be shot and an image side surface facing the imaging surface. Each of the object-side and image-side surfaces includes a surface region near the optical axis (paraxial) and a surface region away from the optical axis (off-axis). In the following description, the shape of each lens surface is convex or concave, and if not explicitly indicated as paraxial or distant from the optical axis, the shape of the surface region at the paraxial position is convex or concave.
The aperture is arranged in front of the first lens and used for reducing stray light.
The first lens element with positive refractive power has a convex surface on the object-side surface. By providing the first lens element with positive refractive power, the total length of the optical imaging lens assembly can be shortened.
The second lens element with negative refractive power has a concave object-side surface and a concave image-side surface. It is beneficial to reduce the manufacturing sensitivity of the lens group and is beneficial to processing the lens.
The third lens element with positive refractive power has a convex object-side surface and a concave image-side surface, and the image-side surface has at least one inflection point on an off-axis side. Preferably, the object-side surface of the third lens also has at least one point of inflection at the off-axis position. The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The fifth lens element with negative refractive power has a convex object-side surface and a concave image-side surface, and the image-side surface has at least one inflection point on an off-axis side.
Wherein, the second lens, the third lens, the fourth lens and the fifth lens have abbe numbers of V2, V3, V4 and V5 respectively, and the optical imaging lens assembly satisfies the following conditions: 0.8< V2/V3< 1.1; and 0.3< (V2+ V3)/(V4+ V5) < 0.45. Through the configuration of the refractive power of each lens and the combination of different lens dispersion coefficients, the aberration and chromatic aberration of the optical imaging lens group can be effectively corrected.
The optical thickness of the second lens element is CT2, the optical thickness of the third lens element is CT3, the axial distance between the image-side surface of the second lens element and the object-side surface of the third lens element is AT2, and the axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TA, wherein the optical imaging lens assembly satisfies the following conditions: 0< (CT2+ AT2+ CT3)/TA < 0.25. Therefore, the total length of the optical imaging lens group can be effectively shortened.
In more detail, the focal length of the first lens is f1, the focal length of the second lens is f2, and the optical imaging lens group satisfies the following conditions: 1.5< | f2/f1| < 2.6. By properly distributing the refractive powers of the first lens element and the second lens element, the total track length of the optical imaging lens assembly is effectively reduced and the aberration is corrected. Preferably, the optical imaging lens group satisfies the following condition: 1.7< | f2/f1| < 2.4.
The effective focal length of the optical imaging lens group is f, the curvature radius of the object side surface of the fourth lens is R7, and the optical imaging lens group meets the following conditions: 1< f/| R7| < 1.55. Therefore, the object side surface of the fourth lens has a proper curvature, and the processing difficulty is reduced.
The curvature radius of the object side surface of the second lens is R3, and the curvature radius of the image side surface of the second lens is R4, and the optical imaging lens group meets the following conditions: -0.5< (R3+ R4)/(R3-R4) < 0.5. Therefore, the object side surface and the image side surface of the second lens can be prevented from being excessively bent, and the aberration can be corrected.
The combined Focal Length (Composite Focal Length) of the third lens and the fourth lens is f34, and the effective Focal Length f of the optical imaging lens group meets the following condition: 0.85< f34/f <1. By configuring the refractive power of the optical imaging lens group in this way, the aberration can be corrected.
First embodiment
Fig. 1A is a schematic diagram of an optical imaging lens assembly according to a first embodiment of the present invention. Fig. 1B is a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration), an Astigmatism Aberration diagram (Astigmatism) and a Distortion Aberration diagram (Aberration) in sequence from left to right according to the first embodiment of the present invention.
As shown in fig. 1A, the optical imaging lens assembly 10 of the first embodiment includes, in order from an object side to an image side, an aperture stop ST, a first lens element 11, a second lens element 12, a third lens element 13, a fourth lens element 14, a fifth lens element 15, a filter assembly 16 and an image plane 17. The object side is a side close to the object, and the image side is a side close to the imaging plane 17. The optical imaging lens assembly 10 can further cooperate with an electro-photosensitive element 100 (disposed on the imaging surface 17) to form an imaging device (not shown).
The first lens element 11 with positive refractive power is made of plastic. The first lens element 11 has an object-side surface 11a facing the object side and an image-side surface 11b facing the image side, wherein the object-side surface 11a is convex, and both surfaces 11a and 11b are aspheric.
The second lens element 12 with negative refractive power is made of plastic. The second lens element 12 has an object-side surface 12a facing the object side and an image-side surface 12b facing the image side, and both surfaces 12a and 12b are aspheric. The object side surface 12a is concave, and the image side surface 12b is concave.
The third lens element 13 with positive refractive power is made of plastic. The third lens element 13 has an object-side surface 13a facing the object side and an image-side surface 13b facing the image side, and both surfaces 13a and 13b are aspheric. Wherein the object-side surface 13a of the third lens element 13 is convex; the image-side surface 13b is concave at the paraxial region and convex at the off-axis region, i.e., the image-side surface 13b of the third lens element 13 has at least one Inflection Point (Inflection Point) at the off-axis region.
The fourth lens element 14 with positive refractive power is made of plastic. The fourth lens element 14 has an object-side surface 14a facing the object side and an image-side surface 14b facing the image side, and both surfaces 14a and 14b are aspheric. The object side 14a is concave, and the image side 14b is convex.
The fifth lens element 15 with negative refractive power is made of plastic. The fifth lens element 15 has an object-side surface 15a facing the object side and an image-side surface 15b facing the image side, and both surfaces 15a and 15b are aspheric. The object-side surface 15a is convex, and the image-side surface 15b is concave at a paraxial region and convex at a paraxial region, i.e., the image-side surface 15b of the fifth lens element 15 has at least one inflection point at an off-axis region.
The filter 16 is disposed between the fifth lens element 15 and the image plane 17, and is made of glass, and the surfaces 16a and 16b thereof are both flat. The Filter assembly 16 is, for example, an infrared Filter (IR Filter).
The curve equation of the aspherical surface of each lens described above is as follows:
wherein, X: the distance between a point on the aspheric surface, which is Y away from the optical axis, and a tangent plane of the aspheric surface on the optical axis;
y: the vertical distance between a point on the aspheric surface and the optical axis;
r: a radius of curvature of the lens at the paraxial region;
k: the cone coefficient; and
ai: the ith order aspheric coefficients.
The effective focal Length of the optical imaging lens assembly 10 of the first embodiment is F, the F-number is Fno, the Total Track Length (TTL), half of the maximum viewing angle is hfov (half Field of view), and the maximum Image Height (Image Height) is IMH, and the values thereof are as follows: f is 3.3mm, Fno is 2.05, TTL is 3.98mm, HFOV is 39 degrees, and IMH is 2.72 mm.
The second lens 12 has an abbe number of V2, and the third lens 13 has an abbe number of V3, which satisfy the following conditions: V2/V3 equals 0.85. In addition, the fourth lens element 14 has an abbe number of V4, the fifth lens element 15 has an abbe number of V5, and the optical imaging lens assembly 10 satisfies the following conditions: (V2+ V3)/(V4+ V5) ═ 0.40.
The optical thickness of the second lens element 12 is CT2, the optical thickness of the third lens element 13 is CT3, the axial distance between the image-side surface 12b of the second lens element 12 and the object-side surface 13a of the third lens element 13 is AT2, and the axial distance between the object-side surface 11a of the first lens element 11 and the image-side surface 15b of the fifth lens element 15 is TA, wherein the optical imaging lens assembly 10 satisfies the following conditions: (CT2+ AT2+ CT3)/TA is 0.20.
The focal length of the first lens 11 is f1, the focal length of the second lens 12 is f2, and the following conditions are satisfied: 1.79, | f2/f1 |.
The effective focal length of the optical imaging lens assembly 10 is f, and the curvature radius of the object-side surface of the fourth lens element 14 is R7, which satisfies the following conditions: f/| R7|, 1.50.
The object-side surface 12a and the image-side surface 12b of the second lens element 12 have radii of curvature R3 and R4, which satisfy the following conditions: (R3+ R4)/(R3-R4) — 0.19.
The combined focal length of the third lens 13 and the fourth lens 14 is f34, which satisfies the following condition with the effective focal length f of the optical imaging lens assembly 10: f34/f is 0.87.
Please refer to table one below, which shows detailed optical data of the optical imaging lens assembly according to the first embodiment of the present invention. Wherein the object side surface 11a of the first lens element 11 is denoted as surface 11a, the image side surface 11b is denoted as surface 11b, and so on for the other lens surfaces; the surface labeled ASP in the table, for example, the object side surface 11a of the first lens 11, indicates that the surface is aspheric. The value of the distance field in the table represents the distance from the surface to the next surface, e.g. the distance from the aperture stop ST to the object side 11a of the first lens 11 is-0.221 mm. The distance from the object side surface 11a to the image side surface 11b of the first lens 11 is 0.530mm, which means that the thickness of the first lens 11 is 0.530 mm. The distance from the image side surface 11b of the first lens 11 to the object side surface 12a of the second lens 12 is 0.157 mm. Others may be so, and will not be repeated below.
Please refer to table two, which shows aspheric coefficients of the lens surfaces according to the first embodiment of the invention. Where K is the cone coefficient in the aspheric curve equation, and A4-A16 represent the 4 th to 16 th aspheric coefficients of each surface. For example, the object side surface 11a of the first lens element 11 has a cone coefficient K of-0.76339. Others may be so, and will not be repeated below. In addition, the following tables of the embodiments correspond to the optical imaging lens assembly of the embodiments, and the definitions of the tables are the same as those of the embodiments, so that the detailed description thereof is omitted in the following embodiments.
Watch two
Second embodiment
Fig. 2A is a schematic diagram of an optical imaging lens assembly according to a second embodiment of the invention. Fig. 2B is a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration), an Astigmatism Aberration diagram (Astigmatism) and a Distortion Aberration diagram (Aberration) in sequence from left to right according to the second embodiment of the invention.
As shown in fig. 2A, the optical imaging lens assembly 20 of the second embodiment includes, in order from an object side to an image side, an aperture stop ST, a first lens element 21, a second lens element 22, a third lens element 23, a fourth lens element 24, a fifth lens element 25, a filter element 26 and an image plane 27. The optical imaging lens assembly 20 can further cooperate with an electro-optic device 200 (disposed on the image plane 27) to form an imaging apparatus (not shown).
The first lens element 21 with positive refractive power is made of plastic. The first lens element 21 has an object-side surface 21a facing the object side and an image-side surface 21b facing the image side, wherein the object-side surface 21a is convex, and both surfaces 21a and 21b are aspheric.
The second lens element 22 with negative refractive power is made of plastic. The second lens element 22 has an object-side surface 22a facing the object side and an image-side surface 22b facing the image side, and both surfaces 22a and 22b are aspheric. The object-side surface 22a is concave at the paraxial region, convex at the off-axis region, and the image-side surface 22b is concave.
The third lens element 23 with positive refractive power is made of plastic. The third lens element 23 has an object-side surface 23a facing the object side and an image-side surface 23b facing the image side, and both surfaces 23a and 23b are aspheric. Wherein the object-side surface 23a of the third lens element 23 is convex; the image-side surface 23b is concave at a paraxial region and convex at an off-axis region, i.e., the image-side surface 23b of the third lens element 23 has at least one inflection point at the off-axis region.
The fourth lens element 24 with positive refractive power is made of plastic. The fourth lens element 24 has an object-side surface 24a facing the object side and an image-side surface 24b facing the image side, wherein the object-side surface 24a is concave, the image-side surface 24b is convex, and both surfaces 24a and 24b are aspheric.
The fifth lens element 25 with negative refractive power is made of plastic. The fifth lens element 25 has an object-side surface 25a facing the object side and an image-side surface 25b facing the image side, and both surfaces 25a and 25b are aspheric. The object-side surface 25a is convex, and the image-side surface 25b is concave at a paraxial region and convex at a paraxial region, i.e., the image-side surface 25b of the fifth lens element 25 has at least one inflection point.
The filter 26 is disposed between the fifth lens element 25 and the image plane 27, and is made of glass, and the surfaces 26a and 26b thereof are both flat. The Filter assembly 26 is, for example, an infrared Filter (IR Filter).
The parameters of the optical imaging lens assembly 20 of the second embodiment are defined as same as those of the first embodiment, for example, the effective focal length is F, the F-number is Fno, and half of the maximum field angle is HFOV, etc., and the relevant parameter values are shown in table three.
Watch III
Next, please refer to table four and table five below, wherein table four is detailed optical data of the optical imaging lens assembly according to the second embodiment of the present invention, and table five is aspheric coefficients of each lens surface according to the second embodiment of the present invention.
Watch four
Watch five
Third embodiment
Fig. 3A is a schematic diagram of an optical imaging lens assembly according to a third embodiment of the invention. Fig. 3B is a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration), an Astigmatism Aberration diagram (Astigmatism) and a Distortion Aberration diagram (Aberration) in sequence from left to right according to a third embodiment of the invention.
As shown in fig. 3A, the optical imaging lens assembly 30 of the third embodiment includes, in order from an object side to an image side, an aperture stop ST, a first lens element 31, a second lens element 32, a third lens element 33, a fourth lens element 34, a fifth lens element 35, a filter element 36 and an image plane 37. The optical imaging lens assembly 30 can further cooperate with an electro-optic device 300 (disposed on the image plane 37) to form an imaging apparatus (not shown).
The first lens element 31 with positive refractive power is made of plastic. The first lens element 31 has an object-side surface 31a facing the object side and an image-side surface 31b facing the image side, wherein the object-side surface 31a is convex, and both surfaces 31a and 31b are aspheric.
The second lens element 32 with negative refractive power is made of plastic. The second lens element 32 has an object-side surface 32a facing the object side and an image-side surface 32b facing the image side, wherein the object-side surface 32a is concave, the image-side surface 32b is concave, and both surfaces 32a and 32b are aspheric.
The third lens element 33 with positive refractive power is made of plastic. The third lens element 33 has an object-side surface 33a facing the object side and an image-side surface 33b facing the image side, and both surfaces 33a and 33b are aspheric. The object-side surface 33a of the third lens element 33 is convex, and the image-side surface 33b is concave at a paraxial region and convex at a paraxial region, i.e., the image-side surface 33b of the third lens element 33 has at least one inflection point at an off-axis region.
The fourth lens element 34 with positive refractive power is made of plastic. The fourth lens element 34 has an object-side surface 34a facing the object side and an image-side surface 34b facing the image side, and both surfaces 34a and 34b are aspheric. The object side surface 34a is concave, and the image side surface 34b is convex.
The fifth lens element 35 with negative refractive power is made of plastic. The fifth lens element 35 has an object-side surface 35a facing the object side and an image-side surface 35b facing the image side, and both surfaces 35a and 35b are aspheric. The object-side surface 35a is convex, and the image-side surface 35b is concave at a paraxial region and convex at a paraxial region, i.e., the image-side surface 35b of the fifth lens element 35 has at least one inflection point at an off-axis region.
The filter 36 is disposed between the fifth lens element 35 and the image plane 37, and is made of glass, and the surfaces 36a and 36b thereof are both flat. The Filter assembly 36 is, for example, an infrared Filter (IR Filter).
The parameters of the optical imaging lens assembly 30 of the third embodiment are defined as same as those of the first embodiment, for example, the effective focal length is F, the F-number is Fno, and half of the maximum field angle is HFOV, and the related parameter values are shown in table six.
Watch six
Next, please refer to the following tables seven and eight, where table seven is the detailed optical data of the optical imaging lens assembly according to the third embodiment of the present invention, and table eight is the aspheric coefficients of the lens surfaces according to the third embodiment of the present invention.
Watch seven
Table eight
Fourth embodiment
Fig. 4A is a schematic diagram of an optical imaging lens assembly according to a fourth embodiment of the invention. Fig. 4B is a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration), an Astigmatism Aberration diagram (Astigmatism) and a Distortion Aberration diagram (Aberration) in sequence from left to right according to a fourth embodiment of the invention.
As shown in fig. 4A, the optical imaging lens assembly 40 of the fourth embodiment includes, in order from an object side to an image side, an aperture stop ST, a first lens element 41, a second lens element 42, a third lens element 43, a fourth lens element 44, a fifth lens element 45, a filter element 46 and an image plane 47. The optical imaging lens assembly 40 can further cooperate with an electro-optic device 400 (disposed on the image plane 47) to form an imaging apparatus (not shown).
The first lens element 41 with positive refractive power is made of plastic. The first lens element 41 has an object-side surface 41a facing the object side and an image-side surface 41b facing the image side, wherein the object-side surface 41a is convex, and both surfaces 41a and 41b are aspheric.
The second lens element 42 with negative refractive power is made of plastic. The second lens element 42 has an object-side surface 42a facing the object side and an image-side surface 42b facing the image side, wherein the object-side surface 42a is concave, the image-side surface 42b is concave, and both surfaces 42a and 42b are aspheric.
The third lens element 43 with positive refractive power is made of plastic. The third lens element 43 has an object-side surface 43a facing the object side and an image-side surface 43b facing the image side, and both surfaces 43a and 43b are aspheric. The object-side surface 43a of the third lens element 43 is convex, and the image-side surface 43b is concave at the paraxial region and convex at the off-axis region, i.e., the image-side surface 43b of the third lens element 43 has at least one inflection point at the off-axis region.
The fourth lens element 44 with positive refractive power is made of plastic. The fourth lens element 44 has an object-side surface 44a facing the object side and an image-side surface 44b facing the image side, wherein the object-side surface 44a is concave, the image-side surface 44b is convex, and both surfaces 44a and 44b are aspheric.
The fifth lens element 45 with negative refractive power is made of plastic. The fifth lens element 45 has an object-side surface 45a facing the object side and an image-side surface 45b facing the image side, and both surfaces 45a and 45b are aspheric. The object-side surface 45a of the fifth lens element 45 is convex, and the image-side surface 45b is concave at a paraxial region and convex at a paraxial region, i.e., the image-side surface 45b of the fifth lens element 45 has at least one inflection point at an off-axis region.
The filter 46 is disposed between the fifth lens element 45 and the image plane 47, and is made of glass, and the surfaces 46a and 46b thereof are both flat. The Filter 46 is, for example, an infrared Filter (IR Filter).
The parameters of the optical imaging lens assembly 40 of the fourth embodiment are defined as same as those of the first embodiment, for example, the effective focal length is F, the F-number is Fno, and half of the maximum field angle is HFOV, and the related parameter values are shown in table nine.
Watch nine
Next, please refer to the following table ten and table eleven, wherein table ten is detailed optical data of the optical imaging lens assembly according to the fourth embodiment of the present invention, and table eleven is aspheric coefficients of each lens surface according to the fourth embodiment of the present invention.
Watch ten
Watch eleven
Fifth embodiment
FIG. 5A is a schematic view of an optical imaging lens assembly according to a fifth embodiment of the present invention. Fig. 5B is a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration), an Astigmatism Aberration diagram (Astigmatism) and a Distortion Aberration diagram (Aberration) according to the fifth embodiment of the invention.
As shown in fig. 5A, the optical imaging lens assembly 50 of the fifth embodiment includes, in order from an object side to an image side, an aperture stop ST, a first lens element 51, a second lens element 52, a third lens element 53, a fourth lens element 54, a fifth lens element 55, a filter assembly 56 and an image plane 57. The optical imaging lens assembly 50 can further cooperate with an electro-optic element 500 (disposed on the image plane 57) to form an imaging device (not shown).
The first lens element 51 with positive refractive power is made of plastic. The first lens element 51 has an object-side surface 51a facing the object side and an image-side surface 51b facing the image side, wherein the object-side surface 51a is convex, and both surfaces 51a and 51b are aspheric.
The second lens element 52 with negative refractive power is made of plastic. The second lens element 52 has an object-side surface 52a facing the object side and an image-side surface 52b facing the image side, wherein the object-side surface 52a is concave, the image-side surface 52b is concave, and both surfaces 52a and 52b are aspheric.
The third lens element 53 with positive refractive power is made of plastic. The third lens element 53 has an object-side surface 53a facing the object side and an image-side surface 53b facing the image side, and both surfaces 53a and 53b are aspheric. The object-side surface 53a of the third lens element 53 is convex, and the image-side surface 53b is concave at the paraxial region and convex at the off-axis region, i.e., the image-side surface 53b of the third lens element 53 has at least one inflection point at the off-axis region.
The fourth lens element 54 with positive refractive power is made of plastic. The fourth lens element 54 has an object-side surface 54a facing the object side and an image-side surface 54b facing the image side, wherein the object-side surface 54a is concave, the image-side surface 54b is convex, and both surfaces 54a and 54b are aspheric.
The fifth lens element 55 with negative refractive power is made of plastic. The fifth lens element 55 has an object-side surface 55a facing the object side and an image-side surface 55b facing the image side, and both surfaces 55a and 55b are aspheric. The object-side surface 55a is convex, and the image-side surface 55b is concave at a paraxial region and convex at a distance from the optical axis, i.e., the image-side surface 55b of the fifth lens element 55 has at least one inflection point at an off-axis region.
The filter element 56 is disposed between the fifth lens element 55 and the image plane 57, and is made of glass, and the surfaces 56a and 56b thereof are both flat. The Filter assembly 56 is, for example, an infrared Filter (IR Filter).
The parameters of the optical imaging lens assembly 50 of the fifth embodiment are defined as same as those of the first embodiment, for example, the effective focal length is F, the F-number is Fno, and half of the maximum field angle is HFOV, and the related parameter values are shown in table twelve.
Watch twelve
Next, please refer to the following table thirteen and table fourteen, wherein table thirteen is detailed optical data of the optical imaging lens assembly according to the fifth embodiment of the invention, and table fourteen is aspheric coefficients of each lens surface according to the fifth embodiment of the invention.
Watch thirteen
Table fourteen
Sixth embodiment
The sixth embodiment of the present invention is an imaging device (not shown) comprising the optical imaging lens assembly and an electronic photosensitive element according to the previous embodiments. The electronic photosensitive Device is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensor. The imaging device is, for example, a portable electronic product camera device or a monitoring camera.
(seventh embodiment)
The seventh embodiment of the present invention is an electronic device (not shown) including the imaging device according to the sixth embodiment. The electronic device is, for example, a portable electronic device such as a mobile phone, a tablet, or an electronic monitoring system, and a vehicle monitoring apparatus.
The above-described embodiments and/or implementations are only for illustrating the preferred embodiments and/or implementations of the present technology, and are not intended to limit the implementations of the present technology in any way, and those skilled in the art can make many modifications or changes without departing from the scope of the technology disclosed in the present disclosure, but should be construed as technology or implementations that are substantially the same as the present technology.
Claims (7)
1. An optical imaging lens assembly, in order from an object side to an image side, comprising:
an aperture;
a first lens element with positive refractive power having an object-side surface and an image-side surface, wherein the object-side surface of the first lens element is convex;
a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface;
a third lens element with positive refractive power having an object-side surface and an image-side surface, wherein the object-side surface of the third lens element is convex, the image-side surface is concave, and the image-side surface has at least one inflection point on an off-axis side;
a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; and
a fifth lens element with negative refractive power having an object-side surface and an image-side surface, wherein the object-side surface of the fifth lens element is convex, the image-side surface is concave, and the image-side surface has at least one inflection point on an off-axis side; wherein the object side surfaces and the image side surfaces of the first lens element to the fifth lens element are aspheric; and the optical imaging lens group satisfies the following conditions:
0.8<V2/V3<1.1；
0.3< (V2+ V3)/(V4+ V5) < 0.45; and
0<(CT2+AT2+CT3)/TA<0.25；
wherein V2 is an abbe number of the second lens element, V3 is an abbe number of the third lens element, V4 is an abbe number of the fourth lens element, V5 is an abbe number of the fifth lens element, CT2 is a thickness of the second lens element on an optical axis, CT3 is a thickness of the third lens element on an optical axis, AT2 is an axial distance between the image-side surface of the second lens element and the object-side surface of the third lens element, and TA is an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element;
the combined focal length of the third lens and the fourth lens is f34, and the optical imaging lens assembly satisfies the following conditions:
0.85<f34/f<1。
2. the optical imaging lens assembly of claim 1, wherein the first lens element has a focal length of f1 and the second lens element has a focal length of f2, wherein the optical imaging lens assembly satisfies the following condition:
1.5<|f2/f1|<2.6。
3. the optical imaging lens group of claim 2, wherein the optical imaging lens group satisfies the following condition:
1.7<|f2/f1|<2.4。
4. the optical imaging lens assembly of claim 1 wherein the effective focal length of the optical imaging lens assembly is f, the radius of curvature of the object-side surface of the fourth lens element is R7, and the optical imaging lens assembly satisfies the following condition:
1<f/|R7|<1.55。
5. the optical imaging lens assembly of claim 1, wherein the radii of curvature of the object-side surface and the image-side surface of the second lens element are R3 and R4, respectively, and the optical imaging lens assembly satisfies the following condition:
-0.5<(R3+R4)/(R3-R4)<0.5。
6. an image forming apparatus, comprising:
the optical imaging lens group of claim 1; and
an electron photosensitive component.
7. An electronic device, comprising:
the imaging apparatus of claim 6.
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| TWI750615B (en) | 2020-01-16 | 2021-12-21 | 大立光電股份有限公司 | Image capturing optical lens assembly, imaging apparatus and electronic device |
| CN111736323B (en) * | 2020-08-26 | 2020-11-13 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
| CN111929822B (en) * | 2020-09-03 | 2021-04-23 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
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| WO2011027690A1 (en) * | 2009-09-02 | 2011-03-10 | コニカミノルタオプト株式会社 | Single-focus optical system, image pickup device, and digital apparatus |
| KR102061230B1 (en) * | 2011-10-31 | 2019-12-31 | 엘지이노텍 주식회사 | Imaging lens |
| JP2015132686A (en) * | 2014-01-10 | 2015-07-23 | 富士フイルム株式会社 | Imaging lens and imaging device including the imaging lens |
| TWI574038B (en) * | 2015-03-13 | 2017-03-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| JP5843996B1 (en) * | 2015-07-07 | 2016-01-13 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| JP5922853B1 (en) * | 2016-01-27 | 2016-05-24 | エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． | Imaging lens |
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