CN107450155B - Optical lens - Google Patents
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- CN107450155B CN107450155B CN201610375776.0A CN201610375776A CN107450155B CN 107450155 B CN107450155 B CN 107450155B CN 201610375776 A CN201610375776 A CN 201610375776A CN 107450155 B CN107450155 B CN 107450155B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 127
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 abstract description 42
- 238000013461 design Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 description 15
- 230000004075 alteration Effects 0.000 description 12
- 238000013041 optical simulation Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 238000012634 optical imaging Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000005499 meniscus Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 210000001747 pupil Anatomy 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
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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
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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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Abstract
The invention provides an optical lens, comprising a first lensThe lens comprises a group, a second lens group and a diaphragm arranged between the first lens group and the second lens group. The first lens group has negative diopter and the number of the lenses with diopter is less than 3. The second lens group has positive diopter and comprises aspheric lenses with diopter, the number of the lenses is less than 5 and diffraction surfaces; and the optical lens meets the following conditions:
wherein
Is the diopter of the diffraction surface,
the refractive power of the lens with the diffraction surface, and V is the Abbe number of the lens with the diffraction surface. By the design of the embodiment of the invention, the optical lens design which can give consideration to light weight and day and night confocal and can provide lower manufacturing cost and better imaging quality can be provided.
Description
Technical Field
The invention relates to an optical lens with a diffraction element and day and night confocal performance.
Background
In recent years, smart home surveillance cameras have been increasingly developed, and demands for reduction in thickness and optical performance have been increasing. To meet such a demand, a lens having low cost, a large aperture, a wide viewing angle, light weight, and a day and night confocal property is generally required. Particularly in the day and night confocal part, the conventional method must use a low dispersion material (fluorite), but the fluorite material has a heavy weight (about 1.5 times that of the general glass) and a high cost (about 18 times that of the general glass), so that the method is contradicted with the trends of low cost and light weight. Therefore, there is a need for an image capturing lens design that can achieve both light weight and day and night confocal, and provide lower manufacturing cost and better imaging quality.
Disclosure of Invention
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.
An embodiment of the invention provides an optical lens including a first lens group and a second lens group sequentially arranged from one direction, and a stop disposed between the first lens group and the second lens group. The first lens group has negative diopter and the number of the lenses with diopter is less than 3. The second lens group has positive diopter and comprises aspheric lenses with diopter, the number of the lenses is less than 5 and diffraction surfaces; and the optical lens meets the following conditions:
wherein
Is the diopter of the diffraction surface,
the refractive power of the lens with the diffraction surface, and V is the Abbe number of the lens with the diffraction surface.
By the design of the embodiment of the invention, the optical lens design which can give consideration to light weight and day and night confocal and can provide lower manufacturing cost and better imaging quality can be provided.
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of an optical lens 10a according to an embodiment of the invention.
Fig. 2 to 5 are graphs of imaging optical simulation data of the optical lens of fig. 1, in which fig. 2 to 3 are graphs of light sectors of visible light and 850nm infrared light, respectively, and fig. 4 to 5 are graphs of diffraction optical transfer functions of 587 nm green light and 850nm infrared light, respectively.
Fig. 6 is a schematic diagram of an optical lens 10b according to another embodiment of the invention.
Fig. 7 to 10 are graphs of imaging optical simulation data of the optical lens of fig. 6, in which fig. 7 to 8 are graphs of light sectors of visible light and 850nm infrared light, respectively, and fig. 9 to 10 are graphs of diffraction optical transfer functions of 587 nm green light and 850nm infrared light, respectively.
Fig. 11 is a schematic diagram of an optical lens 10c according to another embodiment of the invention.
Fig. 12 to 15 are graphs of imaging optical simulation data of the optical lens of fig. 11, in which fig. 12 to 13 are graphs of light sectors of visible light and 850nm infrared light, respectively, and fig. 14 to 15 are graphs of diffraction optical transfer functions of 587 nm green light and 850nm infrared light, respectively.
Fig. 16 is a schematic diagram of an optical lens 10d according to another embodiment of the invention.
Fig. 17 to 20 are graphs of imaging optical simulation data of the optical lens of fig. 16, in which fig. 17 to 18 are graphs of light sectors of visible light and 850nm infrared light, respectively, and fig. 19 to 20 are graphs of diffraction optical transfer functions of 587 nm green light and 850nm infrared light, respectively.
Reference numerals
10a-10d optical lens
12 optical axis
14 aperture
16 glass cover
18 imaging plane
20 first lens group
30 second lens group
L1-L7 lens
Surface S1-S15
Detailed Description
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, 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 referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a schematic diagram illustrating an optical lens 10a according to an embodiment of the invention. The optical lens 10a is disposed between an enlargement side (left side in fig. 1; e.g., the object side) and a reduction side (right side in fig. 1; e.g., the image side). As shown in fig. 1, the optical lens 10a includes a first lens group (e.g., a front group) 20 having a negative refractive power and located between the enlargement side and the reduction side, a second lens group (e.g., a rear group) 30 having a positive refractive power and located between the first lens group 20 and the reduction side, and a diaphragm 14 located within the second lens group 30. Furthermore, the reduction side may be provided with a glass cover 16 and an image sensor, the imaging plane of which is indicated as 18, and the glass cover 16 is located between the second lens group 30 and the imaging plane 18. The first lens group 20 may include a first lens L1 and a second lens L2 sequentially arranged from the magnification side to the reduction side along the optical axis 12 of the optical lens 10a, and the second lens group 30 may include a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 sequentially arranged from the magnification side to the reduction side along the optical axis 12 of the optical lens 10a, diopters of the first lens L1 to the sixth lens L6 are respectively negative, positive, negative and positive. In this embodiment, the sixth lens element L6 can be an aspheric lens including a diffractive surface, the first lens element L1, the second lens element L2 and the fifth lens element L5 are meniscus lenses, and the third lens element L3 and the fourth lens element L4 are biconvex lenses. In addition, the fourth lens L4 and the fifth lens L5 form a cemented lens having a positive refractive power. It should be noted that the adjacent two surfaces of the fourth lens element L4 and the fifth lens element L5 have the same curvature radius, and the adjacent two surfaces of the cemented lens can be bonded by different methods, such as coating an optical adhesive between the adjacent two surfaces for cementing, and pressing the adjacent two surfaces by a mechanical device. The lens design parameters, profile, aspheric coefficients and diffraction surface of the optical lens 10a are shown in table one, table two and table three, respectively, and in each of the following design examples of the present invention, the aspheric polynomial can be expressed by the following formula:
in the above formula (1), Z is the offset amount (sag) in the optical axis direction, c is the reciprocal of the radius of the osculating sphere (osculating sphere), that is, the reciprocal of the radius of curvature near the optical axis, k is the conic coefficient (conc), and r is the aspheric height, that is, the height from the lens center to the lens edge. A-D in Table two represent coefficient values of 4 th order, 6 th order, 8 th order and 10 th order of the aspheric surface polynomial, respectively.
In each of the following embodiments of the present invention, the diffraction surface polynomial can be expressed by the following equation:
φ(r)＝(2π/λ0)∑Cnr2n (2)
in the above formula (2), phi (r) is a diffraction elementThe phase function (phase) of the element (differential optical element), r being the radial distance from the optical axis of the optical lens, λ0Is the reference wavelength (reference wavelength), that is to say the diffraction surface (diffraction optical surface) is the lens surface plus the phase function (phase). C1-C4 in Table III represent the 2 nd, 4 th, 6 th and 8 th order coefficient values of the diffraction surface polynomial, respectively.
Watch 1
The spacing of S1 is the distance of the surfaces S1 to S2 at the optical axis 12, the spacing of S2 is the distance of the surfaces S2 to S3 at the optical axis 12, and the sum of the spacing of S13 and the next spacing is the distance of the surface of the glass cover S13 to the imaging plane 18 at the optical axis 12.
The effective focal length of visible light (EFL of visible light) is 3.976 mm;
infrared effective focal length (EFL of NIR 850nm light) 3.984 mm;
aperture value (F-Number) ═ 1.8;
field of view (FOV) 163.8 degrees;
maximum imaging Height (max. image Height) of the imaging plane is 8.914 mm;
the total lens length (total track length, TTL, distance from S1 to the imaging plane) is 28.83 mm.
Watch two
| S11 | |
| K | -1.63 |
| A | 2.445E-06 |
| B | -5.290E-08 |
| C | 0 |
| D | 0 |
Watch III
Fig. 2-3 are ray fan plots (ray fan plots) of visible light and 850nm infrared light, respectively, where the X-axis is the location where the light passes through the entrance pupil and the Y-axis is the relative value of the location where the chief ray is projected onto the image plane (e.g., imaging plane 18). Fig. 4 to 5 are graphs of imaging optical simulation data of the optical lens 10a of the present embodiment, in which fig. 4 to 5 are graphs of diffraction transfer functions (MTFs) of 587 nm green light and 850nm infrared light, respectively, and the focal plane offset of the two graphs is about 1 μm. Note that the imaged optical simulation data plot can also be plotted using green light at 555 nanometers instead of green light at 587 nanometers. If a focal plane of the 555 nm or 587 nm green light passing through the optical lens 10a is used as a measurement reference, the optical lens 10a satisfies a displacement of 850nm infrared light at the focal plane, which is less than 5 μm away from the measurement reference. The graphs shown in the simulation data diagrams of fig. 2-5 are all within the standard range, so that it can be verified that the optical lens 10a of the present embodiment can have both good optical imaging quality and day and night confocal characteristics.
The optical lens of this embodiment may include two lens groups and the aperture value may be 1.8, and the optical lens may include an aspheric lens with a diffractive surface to correct aberration and chromatic aberration. Further, the following conditions may be satisfied:
20<V<60 (4)
wherein
Diffraction surface power, C1/(-0.5) in Table III,
is the refractive power of the aspheric lens, and V is the Abbe number of the aspheric lens. In particular, it is assumed that the optical lens is designed to conform to
At this time, the chromatic aberration of both the visible light and the infrared light is corrected excessively, and the focal plane of the infrared light becomes short. On the other hand, assume that the optical lens is designed to conform to
At this time, the chromatic aberration of the visible light and the infrared light is not corrected sufficiently, and the focal plane of the infrared light becomes long. Therefore, the optical lens of the present embodiment is designed to conform to
The optical lens has good optical imaging quality and day and night confocal characteristic.
Fig. 6 is a schematic diagram illustrating an optical lens 10b according to another embodiment of the invention. The optical lens 10b is disposed between an enlargement side (left side in fig. 6; e.g., the object side) and a reduction side (right side in fig. 6; e.g., the image side). As shown in fig. 6, the optical lens 10b includes a first lens group (e.g., a front group) 20 having a negative refractive power and located between the enlargement side and the reduction side, a second lens group (e.g., a rear group) 30 having a positive refractive power and located between the first lens group 20 and the reduction side, and a diaphragm 14 located within the second lens group 30. Furthermore, the reduction side may be provided with a glass cover 16 and an image sensor, the imaging plane of which is indicated as 18, and the glass cover 16 is located between the second lens group 30 and the imaging plane 18. The first lens group 20 may include a first lens L1 and a second lens L2 sequentially arranged from the magnification side to the reduction side along the optical axis 12 of the optical lens 10b, and the second lens group 30 may include a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 sequentially arranged from the magnification side to the reduction side along the optical axis 12 of the optical lens 10b, diopters of the first lens L1 to the sixth lens L6 are respectively negative, positive and negative. In this embodiment, the fourth lens element L4 can be an aspheric lens including a diffractive surface, the first lens element L1, the second lens element L2, the third lens element L3 and the sixth lens element L6 are meniscus lenses, and the fifth lens element L5 is a biconvex lens. In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens having a positive refractive power. It should be noted that the adjacent two surfaces of the fifth lens element L5 and the sixth lens element L6 have the same curvature radius, and the adjacent two surfaces of the cemented lens can be bonded by different methods, such as coating an optical adhesive between the adjacent two surfaces for cementing, and pressing the adjacent two surfaces by a mechanical device. The lens design parameters, profile, aspheric coefficients and diffraction surface of the optical lens 10b are shown in table four, table five and table six, respectively, wherein a-D in table five represent the values of 4 th order, 6 th order, 8 th order and 10 th order of the aspheric polynomial (shown in formula 1), respectively. C1-C4 in Table six represent the 2 nd, 4 th, 6 th and 8 th order system values of the diffraction surface polynomial (as shown in equation 2).
Watch four
The spacing of S1 is the distance of the surfaces S1 to S2 at the optical axis 12, the spacing of S2 is the distance of the surfaces S2 to S3 at the optical axis 12, and the sum of the spacing of S13 and the next spacing is the distance of the surface of the glass cover S13 to the imaging plane 18 at the optical axis 12.
The effective focal length of visible light (EFL of visible light) is 4.04 mm;
infrared effective focal length (EFL of NIR 850nm light) 4.054 mm;
aperture value (F-Number) ═ 1.8;
field of view (FOV) 138.5 degrees;
maximum imaging Height (max. image Height) of the imaging plane is 8.914 mm;
the total lens length (TTL, distance from S1 to the imaging plane) is 30 mm.
Watch five
| S8 | |
| K | 0 |
| A | -7.738E-04 |
| B | 2.689E-05 |
| C | -3.242E-06 |
| D | 2.228E-07 |
Watch six
Fig. 7-8 are ray fan plots (ray fan plots) of visible light and 850nm infrared light, respectively, where the X-axis is the location where the light passes through the entrance pupil and the Y-axis is the relative value of the location where the chief ray is projected onto the image plane (e.g., imaging plane 18). Fig. 9 to 10 are graphs of imaging optical simulation data of the optical lens 10b of the present embodiment, in which fig. 9 to 10 are graphs of diffraction transfer functions (MTFs) of 587 nm green light and 850nm infrared light, respectively, and the focal plane offset of the two graphs is about 4 μm. Note that the imaged optical simulation data plot can also be plotted using green light at 555 nanometers instead of green light at 587 nanometers. If a focal plane of the 555 nm or 587 nm green light passing through the optical lens 10b is used as a measurement reference, the optical lens 10b satisfies a displacement of 850nm infrared light at the focal plane, which is less than 5 μm away from the measurement reference. The graphs shown in the simulation data graphs of fig. 7-10 are all within the standard range, so that it can be verified that the optical lens 10b of the present embodiment can have both good optical imaging quality and day and night confocal characteristics.
The optical lens of this embodiment may include two lens groups and the aperture value may be 1.8, and the optical lens may include an aspheric lens with a diffractive surface to correct aberration and chromatic aberration. Further, the following conditions may be satisfied:
20<V<60 (4)
wherein
Diffraction surface power, C1/(-0.5) in Table six,
is the refractive power of the aspheric lens, and V is the Abbe number of the aspheric lens. In particular, it is assumed that the optical lens is designed to conform to
At the moment, the visible light and the infrared light are bothThe chromatic aberration is corrected excessively, and the focal plane of infrared light becomes short. On the other hand, assume that the optical lens is designed to conform to
At this time, the chromatic aberration of the visible light and the infrared light is not corrected sufficiently, and the focal plane of the infrared light becomes long. Therefore, the optical lens of the present embodiment is designed to conform to
The optical lens has good optical imaging quality and day and night confocal characteristic.
Fig. 11 is a schematic diagram illustrating an optical lens 10c according to an embodiment of the invention. The optical lens 10c is disposed between an enlargement side (left side in fig. 11; e.g., the object side) and a reduction side (right side in fig. 11; e.g., the image side). As shown in fig. 11, the optical lens 10c includes a first lens group 20 located between the enlargement side and the reduction side, a second lens group 30 having a positive refractive power and located between the first lens group 20 and the reduction side, and a diaphragm 14 located between the first lens group 20 and the second lens group 30. Furthermore, the reduction side may be provided with a glass cover 16 and an image sensor, the imaging plane of which is indicated as 18, and the glass cover is located between the second lens group 30 and the imaging plane 18. The first lens group 20 may include a first lens L1, a second lens L2, and a third lens L3 arranged in order from the magnification side to the reduction side along the optical axis 12 of the optical lens 10c, and the second lens group 30 may include a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged in order from the magnification side to the reduction side along the optical axis 12 of the optical lens 10c, diopters of the first lens L1 to the sixth lens L6 are respectively negative, positive, negative, and positive. In this embodiment, the sixth lens element L6 can be an aspheric lens including a diffractive surface, the first lens element L1, the second lens element L2 and the fifth lens element L5 are meniscus lenses, and the third lens element L3 and the fourth lens element L4 are biconvex lenses. In addition, the fourth lens L4 and the fifth lens L5 form a cemented lens having a positive refractive power. It should be noted that the adjacent two surfaces of the fourth lens element L4 and the fifth lens element L5 have the same curvature radius, and the adjacent two surfaces of the cemented lens can be bonded by different methods, such as coating an optical adhesive between the adjacent two surfaces for cementing, and pressing the adjacent two surfaces by a mechanical device. The lens design parameters, profile, aspheric coefficients and diffraction surface of the optical lens 10c are shown in table seven, table eight and table nine, respectively, where a-D in table eight represent the values of 4 th order, 6 th order, 8 th order and 10 th order of the aspheric polynomial (shown in formula 1), respectively. C1-C4 in Table nine represent the 2 nd, 4 th, 6 th and 8 th order system values of the diffraction surface polynomial (as shown in equation 2).
Watch seven
The spacing of S1 is the distance of the surfaces S1 to S2 at the optical axis 12, the spacing of S2 is the distance of the surfaces S2 to S3 at the optical axis 12, and the sum of the spacing of S13 and the next spacing is the distance of the surface of the glass cover S13 to the imaging plane 18 at the optical axis 12.
The effective focal length of visible light (EFL of visible light) is 3.964 mm;
infrared effective focal length (EFL of NIR 850nm light) 3.959 mm;
aperture value (F-Number) ═ 1.8;
field of view (FOV) 154.8 degrees;
maximum imaging Height (max. image Height) of the imaging plane is 8.914 mm;
total track length (TTL, distance from S1 to the imaging plane) 29.6 mm;
table eight
Watch nine
Fig. 12-13 are ray fan plots (ray fan plots) of visible light and 850nm infrared light, respectively, where the X-axis is the location where the light passes through the entrance pupil and the Y-axis is the relative value of the location where the chief ray is projected onto the image plane (e.g., imaging plane 18). Fig. 14 to 15 are graphs of imaging optical simulation data of the optical lens 10c of the present embodiment, in which fig. 14 to 15 are graphs of diffraction transfer functions (MTFs) of 587 nm green light and 850nm infrared light, respectively, and the focal plane offset of the two graphs is about 4 μm. Note that the imaged optical simulation data plot can also be plotted using green light at 555 nanometers instead of green light at 587 nanometers. If a focal plane of the 555 nm or 587 nm green light passing through the optical lens 10c is used as a measurement reference, the optical lens 10c satisfies a displacement of 850nm infrared light at the focal plane, which is less than 5 μm away from the measurement reference. The graphs shown in the simulation data graphs of fig. 12-15 are all within the standard range, so that it can be verified that the optical lens 10c of the present embodiment can have both good optical imaging quality and day and night confocal characteristics.
The optical lens of this embodiment may include two lens groups and the aperture value may be 1.8, and the optical lens may include an aspheric lens with a diffractive surface to correct aberration and chromatic aberration. Further, the following conditions may be satisfied:
20<V<60 (4)
wherein
Diffraction surface power, C1/(-0.5) in Table nine,
is the refractive power of the aspheric lens, and V is the Abbe number of the aspheric lens. In particular, it is assumed that the optical lens is designed to conform to
At this time, the chromatic aberration of both the visible light and the infrared light is corrected excessively, and the focal plane of the infrared light becomes short. On the other hand, assume that the optical lens is designed to conform to
At this time, the chromatic aberration of the visible light and the infrared light is not corrected sufficiently, and the focal plane of the infrared light becomes long. Therefore, the optical lens of the present embodiment is designed to conform to
The optical lens has good optical imaging quality and day and night confocal characteristic.
Fig. 16 is a schematic diagram illustrating an optical lens 10d according to an embodiment of the invention. The optical lens 10d is disposed between an enlargement side (left side in fig. 16; e.g., the object side) and a reduction side (right side in fig. 16; e.g., the image side). As shown in fig. 16, the optical lens 10d includes a first lens group 20 located between the enlargement side and the reduction side, a second lens group 30 having a positive refractive power and located between the first lens group 20 and the reduction side, and a stop 14 located between the first lens group 20 and the second lens group 30. Furthermore, the reduction side may be provided with a glass cover 16 and an image sensor, the imaging plane of which is indicated as 18, and the glass cover is located between the second lens group 30 and the imaging plane 18. The first lens group 20 may include a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 arranged in sequence from the magnification side to the reduction side along the optical axis 12 of the optical lens 10d, and the second lens group 30 may include a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged in sequence from the magnification side to the reduction side along the optical axis 12 of the optical lens 10a, diopters of the first lens L1 to the sixth lens L7 are respectively negative, positive, negative and positive. In this embodiment, the fourth lens element L4 can be an aspheric lens including a diffractive surface, the first lens element L1 and the sixth lens element L6 are meniscus lens elements, the second lens element L2 is a biconcave lens element, and the third lens element L3, the fifth lens element L5 and the seventh lens element L7 are biconvex lens elements. In addition, the fifth lens L5 and the sixth lens L6 form a cemented lens having a positive refractive power. It should be noted that the adjacent two surfaces of the fifth lens element L5 and the sixth lens element L6 have the same curvature radius, and the adjacent two surfaces of the cemented lens can be bonded by different methods, such as coating an optical adhesive between the adjacent two surfaces for cementing, and pressing the adjacent two surfaces by a mechanical device. Lens design parameters, shapes, aspheric coefficients and diffraction surfaces of the optical lens 10D are shown in table ten, table eleven and table twelve, respectively, wherein a-D in table eleven represent values of 4 th order, 6 th order, 8 th order and 10 th order coefficients of the aspheric polynomial (shown in formula 1), respectively. C1-C4 in Table twelve represent the values of the 2 nd, 4 th, 6 th and 8 th order terms of the diffraction surface polynomial (as shown in equation 2).
Watch ten
The spacing of S1 is the distance of the surfaces S1 to S2 at the optical axis 12, the spacing of S2 is the distance of the surfaces S2 to S3 at the optical axis 12, and the sum of the spacing of S15 and the next spacing is the distance of the surface of the glass cover S15 to the imaging plane 18 at the optical axis 12.
The effective focal length of visible light (EFL of visible light) is 4.02 mm;
effective focal length of infrared light (EFL of NIR 850nm light) 4.03 mm;
aperture value (F-Number) ═ 1.8;
field of view (FOV) 163.6 degrees;
maximum imaging Height (max. image Height) of the imaging plane is 8.914 mm;
the total lens length (total track length, TTL, distance from S1 to the imaging plane) is 29.1 mm.
Watch eleven
Watch twelve
Fig. 17-18 are ray fan plots (ray fan plots) of visible light and 850nm infrared light, respectively, where the X-axis is the location where the light passes through the entrance pupil and the Y-axis is the relative value of the location where the chief ray is projected onto the image plane (e.g., imaging plane 18). Fig. 19 to 20 are graphs of imaging optical simulation data of the optical lens 10d of the present embodiment, in which fig. 19 to 20 are graphs of diffraction transfer functions (MTFs) of 587 nm green light and 850nm infrared light, respectively, and the focal plane offset of the two graphs is about 53 μm. Note that the imaged optical simulation data plot can also be plotted using green light at 555 nanometers instead of green light at 587 nanometers.
The design of the embodiments 10a, 10b, and 10c can provide a light-weighted imaging lens design that can achieve the confocal characteristics at day and night, and can provide a lower manufacturing cost and better imaging quality.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, it is not necessary for any embodiment or claim of the invention to achieve all of the objects or advantages or features provided by the invention. In addition, the abstract and the title of the invention are provided for assisting the search of patent documents and are not intended to limit the scope of the invention.
Claims (10)
1. An optical lens, comprising:
a first lens group and a second lens group, which are arranged in sequence from one direction;
the aperture is arranged between the first lens group and the second lens group, wherein the second lens group has positive diopter and comprises a lens with a diffraction surface, and the total number of the diffraction surfaces of the optical lens is 1; and
the optical lens meets the following conditions:
wherein
The refractive power of the diffraction surface is,
v is the refractive power of the lens and the Abbe number of the lens.
2. An optical lens, comprising:
the optical lens comprises a first lens group with negative diopter and a second lens group with positive diopter, wherein the first lens group and the second lens group are sequentially arranged in one direction and are separated by the diopter of the first lens group and the diopter of the second lens group, the second lens group comprises a lens with a diffraction surface, and the total number of the diffraction surfaces of the optical lens is 1; and
the optical lens meets the following conditions:
wherein
The refractive power of the diffraction surface is,
v is the refractive power of the lens and the Abbe number of the lens.
3. The optical lens of claim 1 or 2, wherein the first lens group comprises less than 5 diopter lenses.
4. The optical lens of claim 1 or 2, wherein the second lens group comprises less than 5 diopter lenses.
5. An optical lens according to claim 1 or 2,
the optical lens meets the following conditions: if a focal plane of 555 nm or 587 nm green light passing through the optical lens is taken as a measuring standard, the optical lens meets the requirement that 850nm infrared light has a displacement on the focal plane, and the displacement is less than 5 microns away from the measuring standard.
6. The optical lens according to claim 1 or 2, wherein the lens with the diffractive surface satisfies the following condition:
20<V<60。
7. an optical lens according to claim 1 or 2, wherein the first lens group includes a first lens with negative refractive power and a second lens with negative refractive power.
8. An optical lens as claimed in claim 1 or 2, characterized in that the lens is an aspherical lens.
9. An optical lens as claimed in claim 1 or 2, characterized in that the refractive power of the lens is positive and the second lens group further comprises a cemented lens with positive refractive power and another lens with positive refractive power.
10. An optical lens as claimed in claim 9, characterized in that the lens is further away from the first lens group than the further lens.
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| CN107450155B true CN107450155B (en) | 2021-10-08 |
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| CN111221099B (en) * | 2018-11-26 | 2021-09-17 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| TWI797452B (en) * | 2020-05-29 | 2023-04-01 | 光芒光學股份有限公司 | Optical lens and fabrication method thereof |
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