CN216351478U - Camera lens - Google Patents
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- CN216351478U CN216351478U CN202121855287.8U CN202121855287U CN216351478U CN 216351478 U CN216351478 U CN 216351478U CN 202121855287 U CN202121855287 U CN 202121855287U CN 216351478 U CN216351478 U CN 216351478U
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- 238000003384 imaging method Methods 0.000 claims abstract description 89
- 230000014509 gene expression Effects 0.000 claims abstract description 75
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 230000004075 alteration Effects 0.000 description 58
- 201000009310 astigmatism Diseases 0.000 description 56
- 206010010071 Coma Diseases 0.000 description 28
- 238000010586 diagram Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 4
- 230000005499 meniscus Effects 0.000 description 4
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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
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The utility model provides an imaging lens which can meet the requirements of low back and low F value and has good optical characteristics. The imaging lens includes, in order from an object side to an image side: a first lens having a negative focal power; a second lens having a positive focal power; a third lens having a negative focal power; a fourth lens having a positive focal power; and a fifth lens having a negative focal power; the concave surface of the first lens faces the object side in the paraxial region, and the concave surface of the fifth lens faces the image side in the paraxial region, so that the predetermined conditional expression is satisfied.
Description
Technical Field
The present invention relates to an imaging lens for forming an image of an object on a solid-state imaging element of a CCD sensor or a C-MOS sensor used in an imaging device.
Background
In recent years, camera functions have been widely mounted in various products such as home electric appliances, information terminal devices, and automobiles. In the future, development of a product incorporating a camera function is currently being carried out.
Imaging lenses mounted in such apparatuses are required to be small and high-resolution.
As a conventional imaging lens aiming at high performance, for example, an imaging lens of the following patent document 1 is known.
Patent document 1 (japanese unexamined patent application, first publication No. 110850562) discloses an imaging lens including, in order from an object side: a first lens having a negative refractive index; a second lens having a positive refractive index; a third lens having a negative refractive index; a fourth lens having a positive refractive index; and a fifth lens having a negative refractive index; the relationship between the focal length of the third lens and the focal length of the entire system of the image pickup lens,
The relationship between the paraxial radius of curvature of the object-side surface of the second lens and the thickness of the second lens on the optical axis,
The relationship between the paraxial radius of curvature of the object-side surface of the third lens and the paraxial radius of curvature of the image-side surface of the third lens, and the relationship between the thickness of the first lens on the optical axis and the distance from the image-side surface of the first lens to the object-side surface of the second lens on the optical axis satisfy a predetermined condition.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
When the lens structure described in patent document 1 is intended to achieve low back and low F-number, it is very difficult to correct aberrations in the peripheral portion, and good optical performance cannot be obtained.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging lens having high resolution and capable of satisfactorily correcting aberrations while satisfying the requirements for low back and low F-number.
In the terms used in the present invention, the convex surface, concave surface, and flat surface of the lens surface mean shapes near the optical axis (paraxial). The optical power refers to the optical power near the optical axis (paraxial). The pole is a point on the aspheric surface other than the optical axis where the tangent plane perpendicularly intersects the optical axis. The total optical length is a distance on the optical axis from the object-side surface of the optical element located closest to the object side to the imaging surface. The optical total length and the back focal length are distances obtained by converting the thickness of an IR cut filter, a cover glass, or the like disposed between the imaging lens and the imaging surface into air.
Means for solving the problems
An imaging lens according to the present invention includes, in order from an object side to an image side: a first lens having a negative focal power; a second lens having a positive focal power; a third lens having a negative focal power; a fourth lens having a positive focal power; and a fifth lens having a negative focal power; the first lens has a concave surface facing the object side in the paraxial region, and the fifth lens has a concave surface facing the image side in the paraxial region.
The first lens has negative power, and the concave surface in the paraxial region faces the object side, thereby suppressing chromatic aberration, coma, astigmatism, and distortion.
The second lens has positive focal power to realize low back and well correct spherical aberration, astigmatism, curvature of field and distortion.
The third lens has negative power and corrects chromatic aberration, coma, astigmatism, curvature of field, and distortion well.
The fourth lens has positive focal power to realize low back and well correct spherical aberration, coma, astigmatism, curvature of field and distortion.
The fifth lens element has negative refractive power and has a concave surface facing the image side in the paraxial region, and can correct chromatic aberration,
Astigmatism, field curvature, and distortion. In addition, the concave surface faces the image side in the paraxial region, thereby maintaining the low back and ensuring the back focus.
In the imaging lens having the above configuration, it is preferable that the image side surface of the first lens faces the image side in the paraxial region.
By orienting the image side surface of the first lens to the image side in the paraxial region, coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the object side surface of the second lens is convex toward the object side in the paraxial region.
By orienting the object-side surface of the second lens element with the convex surface facing the object side in the paraxial region, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the object side surface of the fourth lens faces the object side in the paraxial region.
By making the object side surface of the fourth lens concave toward the object side in the paraxial region, coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the object-side surface of the fourth lens is formed into an aspherical surface having a pole at a position other than the optical axis.
By forming the object side surface of the fourth lens to be an aspherical surface having a pole at a position other than the optical axis, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the object-side surface of the fifth lens element is formed into an aspherical surface having a pole at a position other than the optical axis.
By forming the object side surface of the fifth lens to be an aspherical surface having a pole at a position other than the optical axis, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the image-side surface of the fifth lens element is formed as an aspherical surface having a pole at a position other than the optical axis.
The fifth lens element is formed to have an aspherical surface having a pole at a position other than the optical axis, whereby astigmatism, curvature of field, and distortion can be corrected satisfactorily.
With the imaging lens of the present invention having the above configuration, it is possible to achieve a low contrast ratio (a ratio of lengths of diagonals of an effective imaging surface of an optical total length night imaging element) of 0.95 or less and a low F value of 2.4 or less.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (1) is satisfied,
(1)0.05＜(r10/|r5|)×100＜7.10
wherein,
r 10: the paraxial radius of curvature of the image-side surface of the fifth lens,
r 5: a paraxial radius of curvature of an object-side surface of the third lens.
By satisfying the range of conditional expression (1), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (2) is satisfied,
(2)2.8＜r9/r8/r10/f5＜10.0
wherein,
r 9: the paraxial radius of curvature of the object-side surface of the fifth lens,
r 8: the paraxial radius of curvature of the image-side surface of the fourth lens,
f 5: focal length of the fifth lens.
By satisfying the range of the conditional expression (2), chromatic aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (3) is satisfied,
(3)0.13＜(r2/T1)/100＜1.15
wherein,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
t1: a distance on an optical axis from an image side surface of the first lens to an object side surface of the second lens.
By satisfying the range of conditional expression (3), lowering of the back is achieved, and coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (4) is satisfied,
(4)-3.80＜|r5|/r6/r1＜-0.85
wherein,
r 5: the paraxial radius of curvature of the object-side surface of the third lens,
r 6: the paraxial radius of curvature of the image-side surface of the third lens,
r 1: a paraxial radius of curvature of an object-side surface of the first lens.
By satisfying the range of conditional expression (4), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (5) is satisfied,
(5)-2.5＜r9/f5＜-0.9
wherein,
r 9: the paraxial radius of curvature of the object-side surface of the fifth lens,
f 5: focal length of the fifth lens.
By satisfying the range of the conditional expression (5), chromatic aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (6) is satisfied,
(6)1.65＜f3/f5＜4.80
wherein,
f 3: the focal length of the third lens is such that,
f 5: focal length of the fifth lens.
By satisfying the range of conditional expression (6), chromatic aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (7) is satisfied,
(7)-4.3＜f5/D5＜-1.0
wherein,
f 5: the focal length of the fifth lens element,
d5: a thickness on an optical axis of the fifth lens.
By satisfying the range of the conditional expression (7), the lower back can be achieved, and chromatic aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (8) is satisfied,
(8)-8.75＜(r1×r2/T1)/100＜-0.55
wherein,
r 1: the paraxial radius of curvature of the object-side surface of the first lens,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
t1: a distance on an optical axis from an image side surface of the first lens to an object side surface of the second lens.
By satisfying the range of conditional expression (8), lowering of the back is achieved, and coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (9) is satisfied,
(9)2.6＜r2/f＜40.0
wherein,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
f: the focal length of the whole system of the camera lens.
By satisfying the range of conditional expression (9), coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (10) is satisfied,
(10)-90.0＜r2/r8＜-9.5
wherein,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
r 8: paraxial radius of curvature of the image-side surface of the fourth lens.
By satisfying the range of conditional expression (10), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (11) is satisfied,
(11)2.0＜r2/r3/r10＜30.0
wherein,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
r 3: the paraxial radius of curvature of the object-side surface of the second lens,
r 10: paraxial radius of curvature of the image-side surface of the fifth lens.
By satisfying the range of conditional expression (11), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (12) is satisfied,
(12)-3.5＜r3/r4＜-1.8
wherein,
r 3: the paraxial radius of curvature of the object-side surface of the second lens,
r 4: a paraxial radius of curvature of an image-side surface of the second lens.
By satisfying the range of conditional expression (12), spherical aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (13) is satisfied,
(13)-1.70＜r3/r7＜-0.15
wherein,
r 3: the paraxial radius of curvature of the object-side surface of the second lens,
r 7: paraxial radius of curvature of the object side of the fourth lens.
By satisfying the range of conditional expression (13), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (14) is satisfied,
(14)-29.5＜r4/T2＜-8.0
wherein,
r 4: the paraxial radius of curvature of the image-side surface of the second lens,
t2: a distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens.
By satisfying the range of the conditional expression (14), reduction in the back is achieved, and spherical aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (15) is satisfied,
(15)0.5＜r6/f＜3.5
wherein,
r 6: the paraxial radius of curvature of the image-side surface of the third lens,
f: the focal length of the whole system of the camera lens.
By satisfying the range of conditional expression (15), coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (16) is satisfied,
(16)0.03＜r6/r2＜0.65
wherein,
r 6: the paraxial radius of curvature of the image-side surface of the third lens,
r 2: a paraxial radius of curvature of an image-side surface of the first lens.
By satisfying the range of conditional expression (16), coma, astigmatism, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (17) is satisfied,
(17)-180.0＜r7/T2＜-16.5
wherein,
r 7: the paraxial radius of curvature of the object-side surface of the fourth lens,
t2: a distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens.
By satisfying the range of conditional expression (17), lowering of the back is achieved, and coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (18) is satisfied,
(18)4.8＜r7/r8＜30.0
wherein,
r 7: the paraxial radius of curvature of the object-side surface of the fourth lens,
r 8: paraxial radius of curvature of the image-side surface of the fourth lens.
By satisfying the range of conditional expression (18), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (19) is satisfied,
(19)-0.45＜r8/f＜-0.15
wherein,
r 8: the paraxial radius of curvature of the image-side surface of the fourth lens,
f: the focal length of the whole system of the camera lens.
By satisfying the range of conditional expression (19), coma, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (20) is satisfied,
(20)-6＜(D1/f1)×100＜-1
wherein,
d1: the thickness on the optical axis of the first lens,
f 1: the focal length of the first lens.
By satisfying the range of the conditional expression (20), lowering of the back is achieved, and chromatic aberration, coma aberration, astigmatism, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (21) is satisfied,
(21)-8.2＜(D3/f3)×100＜-2.5
wherein,
d3: the thickness of the third lens on the optical axis,
f 3: the focal length of the third lens.
By satisfying the range of the conditional expression (21), lowering of the back is achieved, and chromatic aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (22) is satisfied,
(22)0.10＜f4/f＜0.82
wherein,
f 4: the focal length of the fourth lens element is,
f: the focal length of the whole system of the camera lens.
By satisfying the range of the conditional expression (22), spherical aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (23) is satisfied,
(23)-1.05＜f5/f＜-0.20
wherein,
f 5: the focal length of the fifth lens element,
f: the focal length of the whole system of the camera lens.
By satisfying the range of the conditional expression (23), chromatic aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (24) is satisfied,
(24)-16.00＜f1/f4＜-3.25
wherein,
f 1: the focal length of the first lens is such that,
f 4: focal length of the fourth lens.
By satisfying the range of the conditional expression (24), chromatic aberration, spherical aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above configuration, it is preferable that the following conditional expression (25) is satisfied,
(25)-3.0＜f2/f5＜-0.8
wherein,
f 2: the focal length of the second lens is such that,
f 5: focal length of the fifth lens.
By satisfying the range of the conditional expression (25), chromatic aberration, spherical aberration, astigmatism, curvature of field, and distortion can be corrected well.
In the imaging lens having the above-described configuration, it is preferable that the following conditional expression (26) is satisfied,
(26)-0.30＜(f4/f)+(f5/f)＜-0.05
wherein,
f 4: the focal length of the fourth lens element is,
f 5: the focal length of the fifth lens element,
f: the focal length of the whole system of the camera lens.
By satisfying the range of the conditional expression (26), chromatic aberration, spherical aberration, coma aberration, astigmatism, curvature of field, and distortion can be corrected well.
The present invention can provide an imaging lens that satisfies the requirements for a low back and a low F value in a balanced manner, corrects each aberration well, and has a high resolution.
Drawings
Fig. 1 is a diagram showing a schematic configuration of an imaging lens according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing spherical aberration, astigmatism, and distortion of the imaging lens according to embodiment 1 of the present invention.
Fig. 3 is a diagram showing a schematic configuration of an imaging lens according to embodiment 2 of the present invention.
Fig. 4 is a diagram showing spherical aberration, astigmatism, and distortion of the imaging lens according to embodiment 2 of the present invention.
Fig. 5 is a diagram showing a schematic configuration of an imaging lens according to embodiment 3 of the present invention.
Fig. 6 is a diagram showing spherical aberration, astigmatism, and distortion of the imaging lens according to embodiment 3 of the present invention.
Fig. 7 is a diagram showing a schematic configuration of an imaging lens according to embodiment 4 of the present invention.
Fig. 8 is a diagram showing spherical aberration, astigmatism, and distortion of the imaging lens according to example 4 of the present invention.
Fig. 9 is a diagram showing a schematic configuration of an imaging lens according to embodiment 5 of the present invention.
Fig. 10 is a diagram showing spherical aberration, astigmatism, and distortion of the imaging lens according to example 5 of the present invention.
Detailed Description
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
Fig. 1, 3, 5, 7, and 9 are schematic configuration diagrams of imaging lenses according to embodiments 1 to 5 of the present invention, respectively. Hereinafter, an embodiment of the present invention will be described in detail with reference to fig. 1.
As shown in fig. 1, the imaging lens of the present invention includes, in order from an object side to an image side: a first lens L1 having a negative power; a second lens L2 having a positive power; a third lens L3 having a negative power; a fourth lens L4 having a positive power; and a fifth lens L5 having a negative power; the first lens L1 has a concave surface facing the object side in the paraxial region, and the fifth lens L5 has a concave surface facing the image side in the paraxial region.
A filter IR such as an infrared cut filter or a cover glass is disposed between the fifth lens L5 and the imaging surface IMG (i.e., the imaging surface of the imaging element). In addition, the filter IR can be omitted.
The aperture stop ST is disposed between the first lens L1 and the second lens L2, and therefore distortion is easily corrected. The position of the aperture stop ST is not limited to the position between the first lens L1 and the second lens L2. It is sufficient to arrange the image pickup elements appropriately according to the specifications of the image pickup elements.
The first lens L1 has negative refractive power and has a biconcave shape with a concave surface facing the object side and a concave surface facing the image side in the paraxial region. Therefore, chromatic aberration, coma, astigmatism, and distortion are suppressed. Further, the object-side surface of the first lens is formed as an aspherical surface having a pole at a position other than the optical axis, thereby achieving a wider field of view.
The second lens L2 has a positive refractive power and has a biconvex shape with a convex surface facing the object side and a convex surface facing the image side in the paraxial region. Therefore, the spherical aberration, astigmatism, curvature of field, and distortion are corrected well while achieving low back.
The third lens L3 has a negative or positive power and has a meniscus shape with the convex surface facing the object side and the concave surface facing the image side in the paraxial region. Therefore, chromatic aberration, coma, astigmatism, curvature of field, and distortion are corrected well.
The shape of the third lens L3 is not limited to the shape according to numerical embodiment 1.
The third lens element L3 may have a meniscus shape with a concave surface facing the object side and a convex surface facing the image side in the paraxial region. The third lens element L3 may have a biconcave shape in which the concave surface faces the object side and the concave surface faces the image side in the paraxial region. At this time, the chromatic aberration is favorably corrected by the negative powers of both surfaces.
The fourth lens L4 has a positive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region. Therefore, the spherical aberration, coma aberration, astigmatism, curvature of field, and distortion are corrected well.
The object-side surface of the fourth lens L4 is formed into an aspherical surface having a pole at a position other than the optical axis. Astigmatism, curvature of field, and distortion are thus better corrected.
The fifth lens L5 has a negative refractive power and has a meniscus shape with a convex surface facing the object side and a concave surface facing the image side in the paraxial region. Therefore, chromatic aberration, astigmatism, curvature of field, and distortion are corrected well. In addition, the concave surface faces the image side in the paraxial region, thereby maintaining the low back and ensuring the back focus.
The object-side surface of the fifth lens L5 is formed into an aspherical surface having a pole at a position other than the optical axis. Astigmatism, curvature of field, and distortion are thus better corrected.
The image-side surface of the fifth lens L5 is formed into an aspherical surface having a pole at a position other than the optical axis. Astigmatism, curvature of field, and distortion are thus better corrected.
In the imaging lens of the present embodiment, it is preferable that all of the first lens L1 to the fifth lens L5 are constituted by individual lenses. The aspherical surface can be more used by being constituted by only a single lens. In the present embodiment, each aberration is corrected favorably by forming all lens surfaces to be appropriate aspherical surfaces. Further, since man-hours can be reduced as compared with the case of using a cemented lens, it can be manufactured at low cost.
In addition, the imaging lens of the present embodiment is easy to manufacture by using a plastic material for all the lenses, and can be mass-produced at low cost.
The lens material used is not limited to a plastic material. By using a glass material, higher performance can be expected. Further, all lens surfaces are preferably formed to be aspherical, but a spherical surface which can be easily manufactured may be used depending on the required performance.
The imaging lens in the present embodiment satisfies the following conditional expressions (1) to (26), and exhibits a preferable effect.
(1)0.05＜(r10/|r5|)×100＜7.10
(2)2.8＜r9/r8/r10/f5＜10.0
(3)0.13＜(r2/T1)/100＜1.15
(4)-3.80＜|r5|/r6/r1＜-0.85
(5)-2.5＜r9/f5＜-0.9
(6)1.65＜f3/f5＜4.80
(7)-4.3＜f5/D5＜-1.0
(8)-8.75＜(r1×r2/T1)/100＜-0.55
(9)2.6＜r2/f＜40.0
(10)-90.0＜r2/r8＜-9.5
(11)2＜r2/r3/r10＜30
(12)-3.5＜r3/r4＜-1.8
(13)-1.70＜r3/r7＜-0.15
(14)-29.5＜r4/T2＜-8.0
(15)0.5＜r6/f＜3.5
(16)0.03＜r6/r2＜0.65
(17)-180.0＜r7/T2＜-16.5
(18)4.8＜r7/r8＜30.0
(19)-0.45＜r8/f＜-0.15
(20)-6＜(D1/f1)×100＜-1
(21)-8.2＜(D3/f3)×100＜-2.5
(22)0.10＜f4/f＜0.82
(23)-1.05＜f5/f＜-0.20
(24)-16.00＜f1/f4＜-3.25
(25)-3.0＜f2/f5＜-0.8
(26)-0.30＜(f4/f)+(f5/f)＜-0.05
Wherein,
d1: the thickness of the first lens L1 on the optical axis X,
d3: the thickness of the third lens L3 on the optical axis X,
d5: the thickness of the fifth lens L5 on the optical axis X,
t1: the distance on the optical axis X from the image-side surface of the first lens L1 to the object-side surface of the second lens L2,
t2: the distance on the optical axis X from the image-side surface of the second lens L2 to the object-side surface of the third lens L3,
f: the focal length of the whole system of the camera lens,
f 1: the focal length of the first lens L1,
f 2: the focal length of the second lens L2,
f 3: the focal length of the third lens L3,
f 4: the focal length of the fourth lens L4,
f 5: the focal length of the fifth lens L5,
r 1: the paraxial radius of curvature of the object-side surface of the first lens L1,
r 2: the paraxial radius of curvature of the image-side surface of the first lens L1,
r 3: the paraxial radius of curvature of the object-side surface of the second lens L2,
r 4: the paraxial radius of curvature of the image-side surface of the second lens L2,
r 5: the paraxial radius of curvature of the object-side surface of the third lens L3,
r 6: the paraxial radius of curvature of the image-side surface of the third lens L3,
r 7: the paraxial radius of curvature of the object-side surface of the fourth lens L4,
r 8: the paraxial radius of curvature of the image-side surface of the fourth lens L4,
r 9: the paraxial radius of curvature of the object-side surface of the fifth lens L5,
r 10: paraxial radius of curvature of the image-side surface of the fifth lens L5.
Further, it is not necessary to satisfy all of the conditional expressions, and it is possible to obtain the action and effect corresponding to each conditional expression by satisfying each conditional expression individually.
In the present embodiment, the imaging lens satisfies the following conditional expressions (1a) to (26a), and exhibits a further advantageous effect.
(1a)0.2＜(r10/|r5|)×100＜6.5
(2a)3.3＜r9/r8/r10/f5＜7.0
(3a)0.15＜(r2/T1)/100＜0.85
(4a)-3.3＜|r5|/r6/r1＜-1.0
(5a)-1.9＜r9/f5＜-1.1
(6a)1.9＜f3/f5＜4.3
(7a)-4.1＜f5/D5＜-2.5
(8a)-8.0＜(r1×r2/T1)/100＜-0.6
(9a)3.2＜r2/f＜30.0
(10a)-75＜r2/r8＜-11
(11a)2.5＜r2/r3/r10＜23.0
(12a)-3.2＜r3/r4＜-2.3
(13a)-1.4＜r3/r7＜-0.25
(14a)-26.5＜r4/T2＜-10.0
(15a)0.8＜r6/f＜2.5
(16a)0.05＜r6/r2＜0.55
(17a)-140＜r7/T2＜-24
(18a)5＜r7/r8＜24
(19a)-0.40＜r8/f＜-0.25
(20a)-5.5＜(D1/f1)×100＜-2.0
(21a)-7.3＜(D3/f3)×100＜-3.3
(22a)0.40＜f4/f＜0.75
(23a)-0.95＜f5/f＜-0.50
(24a)-13.0＜f1/f4＜-3.7
(25a)-2.40＜f2/f5＜-0.95
(26a)-0.22＜(f4/f)+(f5/f)＜-0.15
The symbols of the respective conditional expressions are the same as those described in the preceding paragraph. The lower limit or the upper limit of the corresponding conditional expressions (1a) to (26a) may be applied to the lower limit or the upper limit of the conditional expressions (1) to (26).
In the present embodiment, the aspherical shape adopted for the aspherical surface of the lens surface is expressed by expression 1 when the axis in the optical axis direction is Z, the height in the direction orthogonal to the optical axis is H, the paraxial radius of curvature is R, the conic coefficient is k, and the aspherical coefficients are a4, a6, A8, a10, a12, a14, a16, a18, and a 20.
[ mathematical formula 1]
Next, an example of the imaging lens according to the present embodiment is shown. In each embodiment, F represents the focal length of the whole system of the imaging lens, Fno represents the F value, and ω represents the half-field pair
Ih denotes the maximum image height, and TTL denotes the total optical length. In addition, i denotes a surface number counted from the object side, r denotes a paraxial radius of curvature, d denotes a distance (surface interval) between lens surfaces on the optical axis, Nd denotes a refractive index of a d-line (reference wavelength), and vd denotes an abbe number with respect to the d-line. The aspherical surface is indicated by an asterisk symbol placed after the surface number i.
[ example 1]
The basic lens data are shown in table 1 below.
[ Table 1]
Example 1
mm
f＝1.68
Fno＝2.20
ω(°)＝55.8
ih＝2.30
TTL＝3.83
Surface data
Image plane
Composing lens data
Aspheric data
The imaging lens of embodiment 1 realizes an overall length-to-angle ratio of 0.83 and an F value of 2.20.
As shown in table 6, conditional expressions (1) to (26) are satisfied.
Fig. 2 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens according to example 1. The spherical aberration diagram shows the amount of aberration for each wavelength of the F-line (486nm), d-line (588nm), and C-line (656 nm). The astigmatism diagrams show the amount of aberration of the d-line on the sagittal image plane S (solid line) and the amount of aberration of the d-line on the meridional image plane T (broken line), respectively (the same applies to fig. 4, 6, 8, and 10). As shown in fig. 2, it is understood that each aberration is corrected well.
[ example 2]
The basic lens data are shown in table 2 below.
[ Table 2]
Example 2
mm
f＝1.68
Fno＝2.20
ω(°)＝54.3
ih＝2.30
TTL＝3.82
Surface data
Image plane
Composing lens data
Aspheric data
The imaging lens of embodiment 2 realizes an overall length-to-angle ratio of 0.83 and an F value of 2.20.
As shown in table 6, conditional expressions (1) to (26) are satisfied.
Fig. 4 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in example 2. As shown in fig. 4, it is understood that each aberration is corrected well.
[ example 3]
The basic lens data are shown in table 3 below.
[ Table 3]
Example 3
mm
f＝1.68
Fno＝2.20
ω(°)＝55.8
ih＝2.30
TTL＝3.83
Surface data
Image plane
Composing lens data
Aspheric data
The imaging lens of embodiment 3 realizes an overall length-to-angle ratio of 0.83 and an F value of 2.20.
As shown in table 6, conditional expressions (1) to (26) are satisfied.
Fig. 6 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens according to example 3. As shown in fig. 6, it is understood that each aberration is corrected well.
[ example 4]
The basic lens data are shown in table 4 below.
[ Table 4]
Example 4
mm
f＝1.68
Fno＝2.20
ω(°)＝55.8
ih＝2.30
TTL＝3.83
Surface data
Image plane
Composing lens data
Aspheric data
The imaging lens of embodiment 4 realizes an overall length-to-angle ratio of 0.83 and an F value of 2.20.
As shown in table 6, conditional expressions (1) to (26) are satisfied.
Fig. 8 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens according to example 4. As shown in fig. 8, it is understood that each aberration is corrected well.
[ example 5]
The basic lens data are shown in table 5 below.
[ Table 5]
Example 5
mm
f＝1.68
Fno＝2.20
ω(°)＝55.8
ih＝2.30
TTL＝3.83
Surface data
Image plane
Composing lens data
Aspheric data
The imaging lens of embodiment 5 realizes an overall length-to-angle ratio of 0.83 and an F value of 2.20.
As shown in table 6, conditional expressions (1) to (26) are satisfied.
Fig. 10 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens according to example 5. As shown in fig. 10, it is understood that each aberration is corrected well.
Table 6 shows values of conditional expressions (1) to (26) according to examples 1 to 5.
[ Table 6]
Industrial applicability
When the imaging lens according to the present invention is applied to a product having a camera function, the camera can contribute to a reduction in the back and F-number of the camera, and can achieve a high performance of the camera.
Description of the reference numerals
ST aperture diaphragm,
A first lens of L1,
L2 second lens,
L3 third lens,
L4 fourth lens,
L5 fifth lens,
An IR filter,
And (5) an IMG image pickup surface.
Claims (7)
1. An imaging lens includes, in order from an object side to an image side:
a first lens having a negative focal power;
a second lens having a positive focal power;
a third lens having a negative focal power;
a fourth lens having a positive focal power; and
a fifth lens having a negative focal power;
the first lens has a concave surface facing the object side in a paraxial region, and the fifth lens has a concave surface facing the image side in a paraxial region, and satisfies predetermined conditional expressions, and satisfies conditional expressions (1) and (2) below:
(1)0.05＜(r10/|r5|)×100＜7.10
(2)2.8＜r9/r8/r10/f5＜10.0
wherein,
r 10: the paraxial radius of curvature of the image-side surface of the fifth lens L5,
r 5: the paraxial radius of curvature of the object-side surface of the third lens L3,
r 9: the paraxial radius of curvature of the object-side surface of the fifth lens L5,
r 8: the paraxial radius of curvature of the image-side surface of the fourth lens L4,
f 5: focal length of the fifth lens L5.
2. The imaging lens according to claim 1, wherein an image side surface of the first lens faces an image side in a paraxial region with a concave surface.
3. The imaging lens according to claim 1, characterized in that the following conditional expression (3) is satisfied:
(3)0.13＜(r2/T1)/100＜1.15
wherein,
r 2: a paraxial radius of curvature of an image-side surface of the first lens,
t1: a distance on an optical axis from an image side surface of the first lens to an object side surface of the second lens.
4. The imaging lens according to claim 1, characterized in that the following conditional expression (4) is satisfied:
(4)-3.80＜|r5|/r6/r1＜-0.85
wherein,
r 5: the paraxial radius of curvature of the object-side surface of the third lens,
r 6: the paraxial radius of curvature of the image-side surface of the third lens,
r 1: a paraxial radius of curvature of an object-side surface of the first lens.
5. The imaging lens according to claim 1, characterized in that the following conditional expression (5) is satisfied:
(5)-2.5＜r9/f5＜-0.9
wherein,
r 9: the paraxial radius of curvature of the object-side surface of the fifth lens,
f 5: focal length of the fifth lens.
6. The imaging lens according to claim 1, characterized in that the following conditional expression (6) is satisfied:
(6)1.65＜f3/f5＜4.80
wherein,
f 3: the focal length of the third lens is such that,
f 5: focal length of the fifth lens.
7. The imaging lens according to claim 1, characterized in that the following conditional expression (7) is satisfied:
(7)-4.3＜f5/D5＜-1.0
wherein,
f 5: the focal length of the fifth lens element,
d5: a thickness on an optical axis of the fifth lens.
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| JP5513641B1 (en) * | 2013-02-20 | 2014-06-04 | 株式会社ＡＡＣ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ Ｒ＆Ｄ Ｃｅｎｔｅｒ | Imaging lens |
| JP6431588B1 (en) * | 2017-10-19 | 2018-11-28 | 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 |
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