CN110554489A - wide-angle lens - Google Patents
wide-angle lens Download PDFInfo
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- CN110554489A CN110554489A CN201810566431.2A CN201810566431A CN110554489A CN 110554489 A CN110554489 A CN 110554489A CN 201810566431 A CN201810566431 A CN 201810566431A CN 110554489 A CN110554489 A CN 110554489A
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- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 238000003384 imaging method Methods 0.000 abstract description 10
- 239000011521 glass Substances 0.000 description 45
- 230000004075 alteration Effects 0.000 description 28
- 238000010586 diagram Methods 0.000 description 15
- 230000001681 protective effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 230000000007 visual effect Effects 0.000 description 5
- 238000012634 optical imaging Methods 0.000 description 3
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Classifications
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
A wide-angle lens includes, arranged in order from an object side to an image side along an optical axis: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens element with negative refractive power, the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with positive refractive power, the sixth lens element with negative refractive power, and the seventh lens element with positive refractive power. It satisfies the following conditions: f/f7 is more than 0.2 and less than 0.5, wherein f is the focal length of the wide-angle lens, and f7 is the focal length of the seventh lens. Through the design, the wide-angle characteristic of the lens can be enhanced, and the imaging quality can be improved.
Description
Technical Field
the present invention relates to an optical lens; in particular to a wide-angle lens.
background
In recent years, with the rise of portable electronic products with a photographing function, the demand of an optical system is increasing. The photosensitive devices of a typical optical system are not limited to a Charge Coupled Device (CCD) or a complementary metal-Oxide Semiconductor (CMOS) Device, and with the advancement of Semiconductor processing technology, the pixel size of the photosensitive Device is reduced, and the optical system is gradually developed in the high pixel field. In addition, as the temperature of the external application environment changes, the requirement of the quality of the lens for the vehicle for the temperature is also increased, and thus, the requirement for the imaging quality is also increased.
However, the existing wide-angle lens cannot meet the existing requirements, and therefore, how to provide a wide-angle lens with a large angle of view, which can effectively reduce aberration and improve optical imaging quality, is one of the directions of the present inventors' studies.
disclosure of Invention
In view of the above, an object of the present invention is to provide a wide-angle lens with a large angle of view, which can effectively reduce aberration and improve optical imaging quality.
To achieve the above object, the present invention provides a wide-angle lens, in order from an object side to an image side along an optical axis, comprising: a first lens element with negative refractive power; a second lens element with negative refractive power; a third lens element with positive refractive power; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; a seventh lens element with positive refractive power; wherein, the wide-angle lens satisfies the following conditions: f/f7 is more than 0.2 and less than 0.5; where f is the focal length of the wide-angle lens, and f7 is the focal length of the seventh lens element.
The invention has the advantages that the wide-angle lens with low aberration, high optical imaging quality and large visual angle can be provided through the design.
Drawings
Fig. 1 is a schematic view of a wide-angle lens according to a first embodiment of the present invention;
Fig. 2A is a spherical aberration diagram of the wide-angle lens according to the first embodiment;
fig. 2B is a field curvature diagram of the wide-angle lens according to the first embodiment;
Fig. 2C is a distortion diagram of the wide-angle lens of the first embodiment;
FIG. 3 is a diagram illustrating a wide-angle lens according to a second embodiment of the present invention;
Fig. 4A is a spherical aberration diagram of the wide-angle lens according to the second embodiment;
Fig. 4B is a field curvature diagram of the wide-angle lens according to the second embodiment;
fig. 4C is a distortion diagram of the wide-angle lens of the second embodiment;
FIG. 5 is a diagram illustrating a wide-angle lens according to a third embodiment of the present invention;
Fig. 6A is a spherical aberration diagram of the wide-angle lens according to the third embodiment;
Fig. 6B is a field curvature diagram of the wide-angle lens according to the third embodiment;
Fig. 6C is a distortion diagram of the wide-angle lens of the third embodiment;
FIG. 7 is a diagram illustrating a wide-angle lens according to a fourth embodiment of the present invention;
Fig. 8A is a spherical aberration diagram of the wide-angle lens according to the fourth embodiment;
Fig. 8B is a field curvature diagram of the wide-angle lens according to the fourth embodiment;
Fig. 8C is a distortion diagram of the wide-angle lens of the fourth embodiment;
[ notation ] to show
[ invention ]
10, 20, 30, 40 wide-angle lens
L1 first lens
L2 second lens
L3 third lens
L4 fourth lens
L5 fifth lens
L6 sixth lens
L7 seventh lens
l8 optical filter
L9 protective glass
Im image plane
z optical axis
ST aperture
Surfaces S1-S14
Detailed Description
In order to more clearly illustrate the present invention, a number of embodiments are described in detail below with reference to the accompanying drawings. Referring to fig. 1, a wide-angle lens 10 according to a first embodiment of the present invention includes, in order from an object side to an image side along an optical axis Z: a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7.
The first lens element L1 with negative refractive power preferably has a glass lens element L1, which has a convex object-side surface S1 and a concave image-side surface S2.
The second lens element L2 with negative refractive power preferably has a glass lens element L2 with a convex object-side surface S3 and a concave image-side surface S4, and at least one surface of the second lens element L2 can be aspheric, for example, in the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are aspheric.
The third lens element L3 with positive refractive power preferably has a glass lens element L3 with a convex object-side surface S5 and a concave image-side surface S6.
The fourth lens element L4 with positive refractive power preferably has a glass lens element L4 with a convex object-side surface S7 and a convex image-side surface S8. In addition, at least one surface of the fourth lens element L4 can be aspheric, for example, in the present embodiment, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspheric.
The fifth lens element L5 with positive refractive power preferably has a glass lens element L5 with a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power preferably has a glass lens element L6, which has a concave object-side surface S11 and a convex image-side surface S12.
The seventh lens element L7 with positive refractive power preferably has a convex-concave glass lens element L7 with a convex object-side surface S13 and a concave image-side surface S14, and at least one surface of the seventh lens element L7 is aspheric, for example, in the present embodiment, the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspheric.
In addition, the fifth lens L5 is preferably cemented with the sixth lens L6 to form a cemented lens, thereby contributing to effectively improving chromatic aberration of the lens and controlling aberration generation.
In addition, in order for the wide-angle lens 10 of the present invention to maintain good optical performance, the wide-angle lens 10 satisfies the following conditions:
(1)0.2＜f/f7＜0.5；
(2)-0.9＜f/f6＜-0.4；
(3)Vd4＞60；
(4)4＜(f1+f2+f3+f4+f5+f6+f7)/f＜6；
(5)3＜(R1/R2)＜6；
wherein f is the focal length of the wide-angle lens 10; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f7 is the focal length of the seventh lens L7; vd4 is the abbe number of the fourth lens L4; r1 is the R value (radius of curvature) of the object-side surface S1 of the first lens L1; r2 is an R value (radius of curvature) of the image-side surface S2 of the first lens L1.
Through the above conditional design, the wide-angle lens 10 can have better imaging quality and larger viewing angle. Furthermore, the conditions of the points (1) and (5) are met, so that the wide-angle characteristic can be effectively enhanced, and a larger system visual angle is provided. By satisfying the condition of the point (2), various aberrations of the system can be effectively corrected. By meeting the conditions of the points (3) and (4), the chromatic aberration can be effectively eliminated.
In addition, the wide-angle lens 10 may further include a stop ST, a filter L8, and a protective glass L9. The stop ST is disposed between the third lens L3 and the fourth lens L4. The filter L8 is disposed between the seventh lens element L7 and the image plane Im, and may be an infrared filter whose object-side surface and image-side surface are both flat surfaces, and made of glass, which does not affect the focal length of the wide-angle lens 10. The protective glass L9 is disposed between the filter L8 and the image plane Im, and has a planar object-side surface and a planar image-side surface, and is made of glass, so that the focal length of the wide-angle lens 10 is not affected.
The following table is lens data of the wide-angle lens 10 according to the first embodiment of the present invention, which includes: a focal length f of the wide-angle lens 10, an aperture value Fno, a view angle FOV, a curvature radius R of each lens, a distance on an optical axis between each surface and a next surface, a refractive index Nd of each lens, and an abbe number Vd of each lens, where the unit of the focal length, the curvature radius, and the thickness is mm.
Watch 1
As can be seen from the above description, the focal length f of the wide-angle lens 10 in the first embodiment is 3.724mm, the focal length f1 of the first lens L1 is-9.982 mm, the focal length f2 of the second lens L2 is-9.475 mm, the focal length f3 of the third lens L3 is 18.609mm, the focal length f4 of the fourth lens L4 is 4mm, the focal length f4 of the fifth lens L4 is 4mm, the focal length f4 of the sixth lens L4 is-4 mm, the focal length Vd f4 of the seventh lens L4 is 4mm, the abbe number 4 of the fourth lens L4 is 64.1, the radius of curvature R4 of the object-side surface S4 of the first lens L4 is 4mm, and the radius of curvature R4 of the image-side surface S4 of the first lens L4 is 4 mm. As can be seen from the above description, f/f 7-0.465, f/f 6-0.422, Vd 4-64.1, (f1+ f2+ f3+ f4+ f5+ f6+ f 7)/f-5.028, and (R1/R2) -3.484 satisfy the conditions set from the point (1) to the point (5).
In addition, with reference to the following table two, the surface sag z of the aspheric surfaces (i.e., the object-side surfaces S3, S7, S13 and the image-side surfaces S4, S8, S14) of the second lens L2, the fourth lens L4 and the seventh lens L7 of the wide-angle lens 10 of the first embodiment is obtained by the following formula:
wherein, z: the concavity of the aspheric surface; c: the inverse of the radius of curvature; h: off-axis half height of the surface; k: a cone coefficient; a to G: coefficient of order of the axial half height h of the surface.
Watch two
As shown in fig. 2A to fig. 2C, by the above design, the wide-angle lens 10 according to the first embodiment of the present invention can meet the requirement of high imaging quality. While as can be seen in fig. 2A, the longitudinal spherical aberration does not exceed 0.05 mm. As can be seen in FIG. 2B, the maximum curvature of field does not exceed 0mm and 0.05 mm. As can be seen from fig. 2C, the amount of distortion does not exceed-50%.
Referring to fig. 3, the wide-angle lens 20 according to a second embodiment of the present invention includes, in order from an object side to an image side along an optical axis Z: a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7.
The first lens element L1 with negative refractive power preferably has a glass lens element L1, which has a convex object-side surface S1 and a concave image-side surface S2.
The second lens element L2 with negative refractive power is preferably made of glass material, and at least one surface of the second lens element L2 can be aspheric, for example, in the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both aspheric.
The third lens element L3 with positive refractive power preferably has a glass lens element L3 with a convex object-side surface S5 and a convex image-side surface S6.
The fourth lens element L4 with positive refractive power preferably has a glass material as the fourth lens element L4. In addition, at least one surface of the fourth lens element L4 can be aspheric, for example, in the present embodiment, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspheric.
The fifth lens element L5 with positive refractive power preferably has a glass lens element L5 with a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power preferably has a glass lens element L6, which has a concave object-side surface S11 and a concave image-side surface S12.
The seventh lens element L7 with positive refractive power preferably has a convex-concave glass lens element L7 with a convex object-side surface S13 and a concave image-side surface S14, and at least one surface of the seventh lens element L7 is aspheric, for example, in the present embodiment, the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspheric.
In addition, the fifth lens L5 is preferably cemented with the sixth lens L6 to form a cemented lens, thereby contributing to effectively improving chromatic aberration of the lens and controlling aberration generation.
In addition, in order for the wide-angle lens 20 of the present invention to maintain good optical performance, the wide-angle lens 20 satisfies the following conditions:
(1)0.2＜f/f7＜0.5；
(2)-0.9＜f/f6＜-0.4；
(3)Vd4＞60；
(4)4＜(f1+f2+f3+f4+f5+f6+f7)/f＜6；
(5)3＜(R1/R2)＜6；
Wherein f is the focal length of the wide-angle lens 20; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f7 is the focal length of the seventh lens L7; vd4 is the abbe number of the fourth lens L4; r1 is the R value (radius of curvature) of the object-side surface S1 of the first lens L1; r2 is an R value (radius of curvature) of the image-side surface S2 of the first lens L1.
By the above condition design, the wide-angle lens 20 can have better imaging quality and larger viewing angle. Furthermore, the conditions of the points (1) and (5) are met, so that the wide-angle characteristic can be effectively enhanced, and a larger system visual angle is provided. By satisfying the condition of the point (2), various aberrations of the system can be effectively corrected. By meeting the conditions of the points (3) and (4), the chromatic aberration can be effectively eliminated.
in addition, the wide-angle lens 20 may further include an aperture ST, a filter L8, and a protective glass L9. The stop ST is disposed between the third lens L3 and the fourth lens L4. The optical filter L8 is disposed between the seventh lens element L7 and the image plane Im, and may be an infrared filter, and the object-side surface and the image-side surface of the optical filter are both flat and made of glass, so that the focal length of the wide-angle lens assembly 20 is not affected. The protective glass L9 is disposed between the filter L8 and the image plane Im, and has a planar object-side surface and a planar image-side surface, and is made of glass, so that the focal length of the wide-angle lens 20 is not affected.
table three below shows lens data of the wide-angle lens 20 according to the second embodiment of the present invention, which includes: a focal length f of the wide-angle lens 20, an aperture value Fno, a view angle FOV, a curvature radius R of each lens, a distance on an optical axis between each surface and a next surface, a refractive index Nd of each lens, and an abbe number Vd of each lens, where the unit of the focal length, the curvature radius, and the thickness is mm.
Watch III
As can be seen from table three, the focal length f of the wide-angle lens 20 in the second embodiment is 3.838mm, the focal length f1 of the first lens L2 is-12.271 mm, the focal length f of the second lens L2 is-16.411 mm, the focal length f3 of the third lens L3 is 3mm, the focal length f3 of the fourth lens L3 is 3mm, the focal length f3 of the fifth lens L3 is 3mm, the focal length f3 of the sixth lens L3 is-3 mm, the focal length f3 of the seventh lens L3 is 3mm, the abbe number 3 of the fourth lens L3 is 81.5, the radius of curvature R3 of the object-side surface S3 of the first lens L3 is 3mm, and the radius of curvature R3 of the image-side surface S3 of the first lens L3 is 3 mm. From the above data, f/f 7-0.239, f/f 6-0.646, Vd 4-64.1, (f1+ f2+ f3+ f4+ f5+ f6+ f 7)/f-4.847, and (R1/R2) -3.566 can be obtained, and the conditions set from the aforementioned point (1) to point (5) are satisfied.
In addition, with reference to the following table four, the surface sag z of the aspheric surfaces (i.e., the object-side surfaces S3, S7, S13 and the image-side surfaces S4, S8, S14) of the second lens L2, the fourth lens L4 and the seventh lens L7 of the wide-angle lens 20 of the second embodiment is obtained by the following formula:
Wherein, z: the concavity of the aspheric surface; c: the inverse of the radius of curvature; h: off-axis half height of the surface; k: a cone coefficient; a to G: coefficient of order of the axial half height h of the surface.
Watch four
With the above design, the wide-angle lens 20 according to the second embodiment of the present invention can meet the requirement of high imaging quality, as shown in fig. 4A to 4C. As can be seen from fig. 4A, the longitudinal spherical aberration does not exceed 0.05 mm. As can be seen in FIG. 4B, the maximum curvature of field does not exceed 0mm and 0.02 mm. As can be seen from FIG. 4C, the amount of distortion does not exceed-50%.
Referring to fig. 5, the wide-angle lens 30 according to a third embodiment of the present invention includes, in order from an object side to an image side along an optical axis Z: a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7.
The first lens element L1 with negative refractive power preferably has a glass lens element L1, which has a convex object-side surface S1 and a concave image-side surface S2.
The second lens element L2 with negative refractive power is preferably made of glass material, and at least one surface of the second lens element L2 can be aspheric, for example, in the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both aspheric.
The third lens element L3 with positive refractive power preferably has a glass lens element L3 with an object-side surface S5 being substantially planar and an image-side surface S6 being convex.
The fourth lens element L4 with positive refractive power preferably has a glass material as the fourth lens element L4. In addition, at least one surface of the fourth lens element L4 can be aspheric, for example, in the present embodiment, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspheric.
The fifth lens element L5 with positive refractive power preferably has a glass lens element L5 with a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power preferably has a glass lens element L6, which has a concave object-side surface S11 and a concave image-side surface S12.
The seventh lens element L7 with positive refractive power preferably has a convex-concave glass lens element L7 with a convex object-side surface S13 and a concave image-side surface S14, and at least one surface of the seventh lens element L7 is aspheric, for example, in the present embodiment, the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspheric.
In addition, the fifth lens L5 is preferably cemented with the sixth lens L6 to form a cemented lens, thereby contributing to effectively improving chromatic aberration of the lens and controlling aberration generation.
in addition, in order for the wide-angle lens 30 of the present invention to maintain good optical performance, the wide-angle lens 30 satisfies the following conditions:
(1)0.2＜f/f7＜0.5；
(2)-0.9＜f/f6＜-0.4；
(3)Vd4＞60；
(4)4＜(f1+f2+f3+f4+f5+f6+f7)/f＜6；
(5)3＜(R1/R2)＜6；
wherein f is the focal length of the wide-angle lens 30; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f7 is the focal length of the seventh lens L7; vd4 is the abbe number of the fourth lens L4; r1 is the R value (radius of curvature) of the object-side surface S1 of the first lens L1; r2 is an R value (radius of curvature) of the image-side surface S2 of the first lens L1.
By the above design, the wide-angle lens 30 can have better imaging quality and larger viewing angle. Furthermore, the conditions of the points (1) and (5) are met, so that the wide-angle characteristic can be effectively enhanced, and a larger system visual angle is provided. By satisfying the condition of the point (2), various aberrations of the system can be effectively corrected. By meeting the conditions of the points (3) and (4), the chromatic aberration can be effectively eliminated.
In addition, the wide-angle lens 30 may further include a stop ST, a filter L8, and a protective glass L9. The stop ST is disposed between the third lens L3 and the fourth lens L4. The optical filter L8 is disposed between the seventh lens element L7 and the image plane Im, and may be an infrared filter, and the object-side surface and the image-side surface of the optical filter are both flat and made of glass, so that the focal length of the wide-angle lens 30 is not affected. The protective glass L9 is disposed between the filter L8 and the image plane Im, and has a planar object-side surface and a planar image-side surface, and is made of glass, so that the focal length of the wide-angle lens 30 is not affected.
Table five below shows lens data of the wide-angle lens 30 according to the third embodiment of the present invention, which includes: a focal length f of the wide-angle lens 30, an aperture value Fno, a view angle FOV, a curvature radius R of each lens, a distance on an optical axis between each surface and a next surface, a refractive index Nd of each lens, and an abbe number Vd of each lens, where the unit of the focal length, the curvature radius, and the thickness is mm.
Watch five
as can be seen from table five, the focal length f of the wide-angle lens 30 in the third embodiment is 4.136mm, the focal length f1 of the first lens L1 is-10.063 mm, the focal length f2 of the second lens L2 is-13.865 mm, the focal length f3 of the third lens L3 is 3mm, the focal length f3 of the fourth lens L3 is 3mm, the focal length f3 of the fifth lens L3 is 3mm, the focal length f3 of the sixth lens L3 is-3 mm, the focal length f3 of the seventh lens L3 is Vd 3mm, the abbe number 3 of the fourth lens L3 is 64.1, the radius of curvature R3 of the object-side surface S3 of the first lens L3 is 3mm, and the radius of curvature R3 of the image-side surface S3 of the first lens L3 is 3 mm. From the above data, f/f 7-0.248, f/f 6-0.836, Vd 4-64.1, (f1+ f2+ f3+ f4+ f5+ f6+ f 7)/f-4.710, and (R1/R2) -5.765 satisfy the conditions set from the point (1) to the point (5).
In addition, with reference to the following sixth table, the surface sag z of the aspheric surfaces (i.e., the object-side surfaces S3, S7, S13 and the image-side surfaces S4, S8, S14) of the second lens L2, the fourth lens L4 and the seventh lens L7 of the wide-angle lens 30 of the third embodiment is obtained by the following formula:
Wherein, z: the concavity of the aspheric surface; c: the inverse of the radius of curvature; h: off-axis half height of the surface; k: a cone coefficient; a to G: coefficient of order of the axial half height h of the surface.
watch six
As shown in fig. 6A to fig. 6C, the wide-angle lens 30 according to the third embodiment of the present invention can achieve the requirement of high imaging quality by the above design. As can be seen from fig. 6A, the longitudinal spherical aberration does not exceed 0.05 mm. As can be seen in FIG. 6B, the maximum curvature of field does not exceed 0mm and 0.05 mm. As can be seen in fig. 6C, the amount of distortion does not exceed-50%.
referring to fig. 7, the wide-angle lens 40 according to a fourth embodiment of the present invention includes, in order from an object side to an image side along an optical axis Z: a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7.
The first lens element L1 with negative refractive power preferably has a glass lens element L1, which has a convex object-side surface S1 and a concave image-side surface S2.
the second lens element L2 with negative refractive power is preferably made of glass material, and at least one surface of the second lens element L2 can be aspheric, for example, in the present embodiment, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are both aspheric.
the third lens element L3 with positive refractive power preferably has a glass lens element L3 with a convex object-side surface S5 and a convex image-side surface S6.
The fourth lens element L4 with positive refractive power preferably has a glass material as the fourth lens element L4. In addition, at least one surface of the fourth lens element L4 can be aspheric, for example, in the present embodiment, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspheric.
the fifth lens element L5 with positive refractive power preferably has a glass lens element L5 with a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power preferably has a glass lens element L6, which has a concave object-side surface S11 and a concave image-side surface S12.
The seventh lens element L7 with positive refractive power preferably has a convex-concave glass lens element L7 with a convex object-side surface S13 and a concave image-side surface S14, and at least one surface of the seventh lens element L7 is aspheric, for example, in the present embodiment, the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspheric.
In addition, the fifth lens L5 is preferably cemented with the sixth lens L6 to form a cemented lens, thereby contributing to effectively improving chromatic aberration of the lens and controlling aberration generation.
In addition, in order for the wide-angle lens 40 of the present invention to maintain good optical performance, the wide-angle lens 40 satisfies the following conditions:
(1)0.2＜f/f7＜0.5；
(2)-0.9＜f/f6＜-0.4；
(3)Vd4＞60；
(4)4＜(f1+f2+f3+f4+f5+f6+f7)/f＜6；
(5)3＜(R1/R2)＜6；
Wherein f is the focal length of the wide-angle lens 40; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4; f5 is the focal length of the fifth lens L5; f6 is the focal length of the sixth lens L6; f7 is the focal length of the seventh lens L7; vd4 is the abbe number of the fourth lens L4; r1 is the R value (radius of curvature) of the object-side surface S1 of the first lens L1; r2 is an R value (radius of curvature) of the image-side surface S2 of the first lens L1.
By the above conditional design, the wide-angle lens 40 can have better imaging quality and larger viewing angle. Furthermore, the conditions of the points (1) and (5) are met, so that the wide-angle characteristic can be effectively enhanced, and a larger system visual angle is provided. By satisfying the condition of the point (2), various aberrations of the system can be effectively corrected. By meeting the conditions of the points (3) and (4), the chromatic aberration can be effectively eliminated.
In addition, the wide-angle lens 40 may further include a stop ST, a filter L8, and a protective glass L9. The stop ST is disposed between the third lens L3 and the fourth lens L4. The filter L8 is disposed between the seventh lens element L7 and the image plane Im, and may be an infrared filter, where the object-side surface and the image-side surface of the filter are both flat and made of glass, which does not affect the focal length of the wide-angle lens 40. The protective glass L9 is disposed between the filter L8 and the image plane Im, and has a planar object-side surface and a planar image-side surface, and is made of glass, so that the focal length of the wide-angle lens 40 is not affected.
the following seventh table shows lens data of the wide-angle lens 40 according to the fourth embodiment of the present invention, which includes: a focal length f of the wide-angle lens 40, an aperture value Fno, a view angle FOV, a curvature radius R of each lens, a distance on an optical axis between each surface and a next surface, a refractive index Nd of each lens, and an abbe number Vd of each lens, where the unit of the focal length, the curvature radius, and the thickness is mm.
Watch seven
As can be seen from table seven, the focal length f of the wide-angle lens 40 in the fourth embodiment is 4.262mm, the focal length f1 of the first lens L1 is-12.309 mm, the focal length f 12.309 of the second lens L12.309 is-12.309 mm, the focal length f 12.309 of the third lens L12.309 is 12.309mm, the focal length f 12.309 of the fourth lens L12.309 is 12.309mm, the focal length f 12.309 of the fifth lens L12.309 is 12.309mm, the focal length f 12.309 of the sixth lens L12.309 is-12.309 mm, the focal length f 12.309 of the seventh lens L12.309 is Vd 12.309mm, the abbe number coefficient 12.309 of the fourth lens L12.309 is 64.1, the radius of curvature R12.309 of the object-side surface S12.309 of the first lens L12.309 is 12.309mm, and the radius of curvature R12.309 of the image-side surface S12.309 of the first lens L12.309 is 12.309 mm. From the above data, f/f 7-0.266, f/f 6-0.670, Vd 4-64.1, (f1+ f2+ f3+ f4+ f5+ f6+ f 7)/f-5.430, and (R1/R2) -3.566 satisfy the conditions set from the point (1) to the point (5).
In addition, with reference to the following table eight, the surface sag z of the aspheric surfaces (i.e., the object-side surfaces S3, S7, S13 and the image-side surfaces S4, S8, S14) of the second lens L2, the fourth lens L4 and the seventh lens L7 of the wide-angle lens 40 of the fourth embodiment is obtained by the following formula:
Wherein, z: the concavity of the aspheric surface; c: the inverse of the radius of curvature; h: off-axis half height of the surface; k: a cone coefficient; a to G: coefficient of order of the axial half height h of the surface.
table eight
As shown in fig. 8A to 8C, by the above design, the wide-angle lens 40 according to the fourth embodiment of the present invention can achieve the requirement of high imaging quality. As can be seen from fig. 8A, the longitudinal spherical aberration does not exceed 0.005 mm. As can be seen in FIG. 8B, the maximum curvature of field does not exceed-0.05 mm and 0.05 mm. As can be seen from FIG. 8C, the amount of distortion does not exceed-50%.
in summary, through the above-mentioned structure of the wide-angle lens and the design of the optical parameters thereof, the wide-angle lens of the present invention can achieve the purpose of increasing the angle of view, so as to achieve the effect of wide angle of view with the angle of view larger than 140 degrees, and in addition, can achieve other effects of effectively shortening the total length of the lens, effectively correcting the aberration, and increasing the resolution of the lens.
The above description is only a few examples of the present invention, which is not intended to limit the scope of the invention, but rather the invention is to be construed as broadly as the invention is defined in the appended claims.
Claims (10)
1. A wide-angle lens includes, in order from an object side to an image side along an optical axis:
A first lens element with negative refractive power;
a second lens element with negative refractive power;
A third lens element with positive refractive power;
A fourth lens element with positive refractive power;
a fifth lens element with positive refractive power;
A sixth lens element with negative refractive power;
A seventh lens element with positive refractive power;
Wherein, the wide-angle lens satisfies the following conditions: f/f7 is more than 0.2 and less than 0.5;
Where f is the focal length of the wide-angle lens, and f7 is the focal length of the seventh lens element.
2. The wide-angle lens of claim 1, wherein the fifth lens element is cemented with the sixth lens element to form a cemented lens.
3. The wide-angle lens of claim 1, which satisfies the following condition: -0.9 < f/f6 < -0.4; where f6 is the focal length of the sixth lens.
4. the wide-angle lens of claim 1, which satisfies the following condition: vd4 is more than 60, wherein Vd4 is the Abbe number of the fourth lens.
5. the wide-angle lens of claim 1, which satisfies the following condition: 4 < (f1+ f2+ f3+ f4+ f5+ f6+ f7)/f < 6, wherein f1 is the focal length of the first lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens; f6 is the focal length of the sixth lens.
6. the wide-angle lens of claim 1, which satisfies the following condition: 3 < (R1/R2) < 6, wherein R1 is the R value of the object-side surface of the first lens; r2 is an R value of the image-side surface of the first lens.
7. The wide-angle lens of claim 1, wherein at least one surface of the second lens is an aspheric surface.
8. The wide-angle lens of claim 1, wherein at least one surface of the fourth lens is an aspheric surface.
9. The wide-angle lens of claim 1, wherein at least one surface of the seventh lens element is an aspheric surface.
10. The wide-angle lens of claim 1, wherein the seventh lens element is a convex-concave lens element having a convex object-side surface and a concave image-side surface.
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