CN114879344B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
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- CN114879344B CN114879344B CN202210566151.8A CN202210566151A CN114879344B CN 114879344 B CN114879344 B CN 114879344B CN 202210566151 A CN202210566151 A CN 202210566151A CN 114879344 B CN114879344 B CN 114879344B
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- 230000003287 optical effect Effects 0.000 claims abstract description 78
- 239000011521 glass Substances 0.000 claims description 12
- 230000004075 alteration Effects 0.000 description 25
- 238000010586 diagram Methods 0.000 description 15
- 238000003384 imaging method Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
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- 101000799143 Homo sapiens Alkyldihydroxyacetonephosphate synthase, peroxisomal Proteins 0.000 description 2
- 238000000848 angular dependent Auger electron spectroscopy Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 238000012937 correction Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- 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 invention discloses a fixed-focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens has positive focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the sixth lens has positive or negative focal power; the fourth lens and the fifth lens form a cemented lens group. The technical scheme of the embodiment of the invention can realize a large-aperture high-resolution fixed-focus lens.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a fixed-focus lens.
Background
Advanced driving assistance systems (Advanced Driving Assistant System, ADAS) are increasingly used in automobiles, and the ADAS systems include imaging cameras for monitoring image information, and the requirements for imaging cameras for safe driving are increasing and the requirements are also increasing.
At present, the conventional vehicle-mounted lens has low resolution (less than 8M), small aperture (mostly distributed around F2.0) and difficulty in meeting market demands.
Disclosure of Invention
The invention provides a fixed-focus lens for realizing a large aperture and high resolution.
The fixed focus lens provided by the embodiment of the invention comprises the following components:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens has positive focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the sixth lens has positive or negative focal power;
the fourth lens and the fifth lens form a cemented lens group.
Optionally, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass lenses.
Optionally, the sixth lens is a glass aspheric lens.
Optionally, a surface of the lens adjacent to the object plane is an object plane surface, and a surface of the lens adjacent to the image plane is an image plane surface;
the object side surface of the first lens is convex towards the object plane, and the image side surface of the first lens is concave towards the image plane;
the object side surface of the second lens is sunken towards the object plane, and the image side surface of the second lens is sunken towards the image plane;
the object side surface of the third lens protrudes towards the object plane, and the image side surface of the third lens protrudes towards the image plane;
the object side surface of the fourth lens is convex towards the object plane, and the image side surface of the fourth lens is concave towards the image plane;
the object side surface of the fifth lens protrudes towards the object plane, and the image side surface of the fifth lens protrudes towards the image plane;
the object side surface of the sixth lens is convex towards the object plane, and the image side surface of the sixth lens is concave towards the image plane.
Optionally, the focal length of the fixed focus lens isThe optical power of the first lens is +.>The focal power of the second lens isThe third lens has optical power of +>The optical power of the fourth lens is +.>The optical power of the fifth lens is +.>The optical power of the sixth lens is +.>Wherein:
alternatively, the refractive index of the second lens is nd2, and the abbe number is vd2; the refractive index of the fourth lens is nd4, and the Abbe number is vd4; the refractive index of the sixth lens is nd6, and the Abbe number is vd6; wherein:
0.05＜nd2/vd2＜0.08；0.06＜nd4/vd4＜0.10；0.01＜nd6/vd6＜0.06。
optionally, a distance from an optical axis center of the object side of the first lens element to the image plane is TTL, and a distance from an optical axis center of the image side of the sixth lens element to the image plane is BFL, wherein:
0.05＜BFL/TTL＜0.31。
optionally, the fixed focus lens further comprises a diaphragm;
the diaphragm is positioned in the light path between the second lens and the third lens; alternatively, the diaphragm is located in the optical path between the first lens and the second lens; alternatively, the diaphragm is located in the optical path between the third lens and the fourth lens.
Optionally, the fixed focus lens further comprises an optical filter;
the optical filter is positioned in the light path between the sixth lens and the image plane.
Optionally, the aspherical surface of the glass aspherical lens satisfies:
wherein Z represents the axial sagittal height of the aspheric surface in the Z direction; r represents the distance from the point on the aspherical surface to the optical axis; c represents the curvature of the fitting sphere, and is the inverse of the curvature radius in value; k represents a fitting cone coefficient; A. b, C, D, E, F the coefficients of the aspheric polynomials of order 4, 6, 8, 10, 12 and 14 respectively.
According to the fixed-focus lens provided by the embodiment of the invention, the number of lenses in the fixed-focus lens and the focal power of each lens are reasonably set, and the fourth lens and the fifth lens are arranged to form the cemented lens group, so that the F-number is less than or equal to 1.6, and the large-aperture high-resolution fixed-focus lens with the resolution reaching 8M can be realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to a first embodiment of the present invention;
FIG. 2 is a light fan diagram of a fixed focus lens according to an embodiment of the invention;
FIG. 3 is a vertical axis chromatic aberration diagram of a fixed focus lens according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention;
FIG. 5 is a light fan diagram of a fixed focus lens in a second embodiment of the invention;
FIG. 6 is a vertical axis chromatic aberration diagram of a fixed focus lens in a second embodiment of the invention;
fig. 7 is a schematic structural diagram of a fixed focus lens according to a third embodiment of the present invention;
FIG. 8 is a light ray fan diagram of a fixed focus lens in a third embodiment of the invention;
fig. 9 is a vertical axis chromatic aberration diagram of a fixed focus lens in the third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a fixed-focus lens according to a first embodiment of the present invention, as shown in fig. 1, the fixed-focus lens according to the first embodiment of the present invention includes a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, and a sixth lens element 160, which are sequentially arranged along an optical axis from an object plane to an image plane; the first lens 110 has positive power, the second lens 120 has negative power, the third lens 130 has positive power, the fourth lens 140 has negative power, the fifth lens 150 has positive power, and the sixth lens 160 has positive or negative power; the fourth lens 140 and the fifth lens 150 constitute a cemented lens group.
The focal power is equal to the difference between the convergence of the image side light beam and the convergence of the object side light beam, and the focal power characterizes the light ray deflection capability of the optical system. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group).
In the fixed focus lens provided in this embodiment, each lens may be fixed in one lens barrel (not shown in fig. 1), where the first lens 110 has positive power, the second lens 120 has negative power, the third lens 130 has positive power, the fourth lens 140 has negative power, the fifth lens 150 has positive power, the sixth lens 160 has positive power or negative power, and the powers of the whole fixed focus lens are distributed according to a certain proportion, so as to ensure the uniformity of the incident angles of the front and rear lens groups, so as to reduce the sensitivity of the lens and improve the possibility of production; in addition, the lens is beneficial to realizing large aperture and high resolution.
In the fixed focus lens provided in the present embodiment, the fourth lens 140 and the fifth lens 150 form a cemented lens group, and thus, the air space between the fourth lens 140 and the fifth lens 150 can be effectively reduced, thereby reducing the total lens length. In addition, the cemented lens group can effectively reduce chromatic aberration or eliminate chromatic aberration, so that various aberrations of the fixed focus lens can be sufficiently corrected, on the premise of compact structure, the resolution can be improved, the aperture can be increased, the optical properties such as distortion and the like can be optimized, the light quantity loss caused by reflection between lenses can be reduced, the illuminance can be improved, and the image quality and the imaging definition of the lens can be improved. In addition, the use of the cemented lens assembly can also reduce assembly components between two lenses, simplify assembly procedures in the lens manufacturing process, reduce cost, and reduce tolerance sensitivity problems of lens units due to tilting/decentering and the like generated in the assembly process.
Alternatively, the fourth lens 140 and the fifth lens 150 may be supported by a spacer ring to form a cemented lens assembly, which is relatively simple in process. In other embodiments, the fourth lens 140 and the fifth lens 150 may be bonded together by glue, so as to form a cemented lens assembly, which may be set by a person skilled in the art according to practical needs.
According to the fixed-focus lens provided by the embodiment of the invention, the number of lenses in the fixed-focus lens and the focal power of each lens are reasonably set, and the fourth lens and the fifth lens are arranged to form the cemented lens group, so that the F-number is less than or equal to 1.6, and the large-aperture high-resolution fixed-focus lens with the resolution reaching 8M can be realized.
On the basis of the above embodiment, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 are optionally glass lenses.
The lens made of glass materials has small thermal expansion coefficient and good stability, and is favorable for keeping the focal length of the fixed-focus lens stable when the ambient temperature used by the fixed-focus lens changes greatly. According to the embodiment of the invention, the six lenses are all glass lenses, so that the fixed focus lens can meet the use requirement at the temperature of-40-95 ℃.
Optionally, the sixth lens 160 is a glass aspheric lens.
Aspherical lenses are characterized by a continuously varying curvature from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. According to the embodiment of the invention, the sixth lens 160 is a glass aspheric lens, so that aberration generated during imaging can be eliminated as much as possible, and the imaging quality of the lens is improved.
As shown in fig. 1, optionally, a surface of the lens adjacent to the object plane side is an object side surface, and a surface of the lens adjacent to the image plane side is an image side surface; the object side surface of the first lens 110 protrudes towards the object plane, and the image side surface of the first lens 110 is recessed towards the image plane; the object side surface of the second lens 120 is concave towards the object plane, and the image side surface of the second lens 120 is concave towards the image plane; the object side surface of the third lens 130 protrudes towards the object plane, and the image side surface of the third lens 130 protrudes towards the image plane; the object side surface of the fourth lens 140 protrudes towards the object plane, and the image side surface of the fourth lens 140 is recessed towards the image plane; the object side surface of the fifth lens 150 protrudes toward the object plane, and the image side surface of the fifth lens 150 protrudes toward the image plane; the object-side surface of the sixth lens 160 protrudes toward the object plane, and the image-side surface of the sixth lens 160 is recessed toward the image plane.
Specifically, the surface type of each lens is reasonably arranged, so that the focal power of each lens is ensured, the focal power requirement in the embodiment is met, and meanwhile, the whole fixed focus lens is compact in structure and high in fixed focus lens integration level.
Optionally, the focal length of the fixed focus lens isThe first lens 110 has an optical power of +.>The second lens 120 has an optical power of +.>The third lens 130 has an optical power of +>The fourth lens 140 has an optical power of +>The optical power of the fifth lens 150 is +.>The optical power of the sixth lens 160 is +.>Wherein:
in this embodiment, by reasonably distributing the focal power of each lens, the correction of aberration in the ultra-large aperture is facilitated, and the fixed-focus lens is ensured to have higher resolution.
Alternatively, the refractive index of the second lens 120 is nd2, and the abbe number is vd2; the fourth lens 140 has a refractive index nd4 and an abbe number vd4; the refractive index of the sixth lens 160 is nd6, and the abbe number is vd6; wherein:
0.05＜nd2/vd2＜0.08；0.06＜nd4/vd4＜0.10；0.01＜nd6/vd6＜0.06。
wherein, the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The abbe number is an index for indicating the dispersion ability of the transparent medium, and the more serious the medium dispersion, the smaller the abbe number; conversely, the more slightly the dispersion of the medium, the greater the Abbe number.
The refractive indexes and abbe numbers of the second lens 120, the fourth lens 140 and the sixth lens 160 in the fixed focus lens are matched, so that the uniformity of the incidence angle of the front lens group and the rear lens group is ensured, the sensitivity of the lens is reduced, and higher pixel resolution is realized.
Referring to fig. 1, optionally, the distance from the center of the optical axis of the object side of the first lens element 110 to the image plane is TTL, and the distance from the center of the optical axis of the image side of the sixth lens element 160 to the image plane is BFL, wherein: BFL/TTL is more than 0.05 and less than 0.31.
The distance from the center of the optical axis of the image side of the sixth lens element 160 to the image plane can be understood as the back focal length of the fixed-focus lens element, and the distance from the center of the optical axis of the object side of the first lens element 110 to the image plane can be understood as the total optical length of the fixed-focus lens element. Through the reasonable relation between the back focus of setting the burnt camera lens and the total length of setting the burnt camera lens, can guarantee that whole setting the burnt camera lens compact structure, the fixed burnt camera lens integrated level is high, still can guarantee when realizing shorter total length that imaging sensor has sufficient installation space.
As shown in fig. 1, optionally, the fixed focus lens further includes a diaphragm 170; the diaphragm 170 is located in the optical path between the second lens 120 and the third lens 130. Specifically, in this embodiment, the diaphragm 170 is disposed in the optical path between the second lens 120 and the third lens 130, so that the propagation direction of the light beam can be adjusted, and the incident angle of the light beam can be adjusted, which is beneficial to improving the imaging quality. The arrangement shown in fig. 1 is only illustrative, and in other embodiments, the diaphragm 170 may be disposed in the optical path between the first lens 110 and the second lens 120, or in the optical path between the third lens 130 and the fourth lens 140.
As shown in fig. 1, optionally, the fixed focus lens further includes an optical filter 180; the filter 180 is located in the optical path between the sixth lens 160 and the image plane. Specifically, in this embodiment, by disposing the optical filter 180 between the sixth lens 160 and the image plane, unwanted stray light can be filtered out, so as to improve the image quality of the fixed focus lens. The optical filter 180 may be, for example, a flat filter, and the imaging quality of the fixed focus lens is improved by filtering infrared light through the flat filter during the daytime.
For example, table 1 details specific optical physical parameters of each lens in the fixed focus lens provided in the first embodiment of the present invention in a possible implementation manner, and the fixed focus lens in table 1 corresponds to the fixed focus lens shown in fig. 1.
Table 1 design values of optical physical parameters of fixed focus lens
The surface numbers in table 1 are numbered according to the surface order of the respective lenses, where "OBJ" represents the object plane, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, "STO" represents the stop 170, and so on; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface curved to the image plane side, a negative value represents the surface curved to the object plane side, wherein "Infinity" represents the surface as a plane and the radius of curvature is Infinity; thickness represents the center axial distance from the current surface to the next surface, and the radius of curvature and thickness are each in millimeters (mm). Refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light, space represents the current position as air, and refractive index is 1; the Abbe number (vd) represents the dispersive properties of the material to light between the current surface and the next surface, and the space represents the current position as air.
On the basis of the above embodiment, the aspherical surface of the glass aspherical lens (sixth lens 160) satisfies:
wherein Z represents the axial sagittal height of the aspheric surface in the Z direction; r represents the distance from the point on the aspherical surface to the optical axis; c represents the curvature of the fitting sphere, and is the inverse of the curvature radius in value; k represents a fitting cone coefficient; A. b, C, D, E, F the coefficients of the aspheric polynomials of order 4, 6, 8, 10, 12 and 14 respectively.
Table 2 details the aspherical coefficients of the lenses in this example one, by way of example, in one possible implementation.
Table 2 design value of aspherical coefficient in fixed focus lens
| Face number | k | A | B | C | D | E | F |
| S11 | -5.515 | -5.46E-05 | -6.47E-07 | -1.07E-07 | 1.73E-08 | -7.91E-10 | 1.59E-11 |
| S12 | 0.588 | 1.11E-04 | -1.02E-05 | 2.07E-06 | -1.34E-07 | 3.16E-09 | 6.07E-11 |
Wherein, -5.46E-05 represents that the coefficient A with the surface number S11 is-5.46 x 10 -5 And so on.
Further, fig. 2 is a light ray fan diagram of a fixed focus lens in the first embodiment of the present invention, as shown in fig. 2, the imaging ranges of the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) under different angles of view of the fixed focus lens are smaller and the curves are very concentrated, so that the aberration of different field areas is ensured to be smaller, that is, the fixed focus lens is illustrated to correct the aberration of the optical system better.
Fig. 3 is a vertical axis chromatic aberration chart of a fixed focus lens in the first embodiment of the invention, as shown in fig. 3, the vertical direction represents normalization of the angle of view, 0 represents the maximum radius of view on the optical axis, the vertical direction represents the offset of the reference meridian range (vertical axis), and the horizontal direction represents the unit micrometers (μm), and as can be seen from fig. 3, the vertical axis chromatic aberration can be controlled within the (-4 μm,2 μm) range, which indicates that the chromatic aberration of the fixed focus lens is better controlled.
Example two
Fig. 4 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present invention, as shown in fig. 4, the fixed-focus lens according to the second embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110 has positive power, the second lens 120 has negative power, the third lens 130 has positive power, the fourth lens 140 has negative power, the fifth lens 150 has positive power, and the sixth lens 160 has positive or negative power; the fourth lens 140 and the fifth lens 150 constitute a cemented lens group; diaphragm 170 is positioned in the optical path between second lens 120 and third lens 130; the filter 180 is located in the optical path between the sixth lens 160 and the image plane. Various parameter settings of each lens are described in the first embodiment and will not be described in detail herein. The arrangement shown in fig. 4 is only illustrative, and in other embodiments, the diaphragm 170 may be disposed in the optical path between the first lens 110 and the second lens 120, or in the optical path between the third lens 130 and the fourth lens 140.
For example, table 3 details specific optical physical parameters of each lens in the fixed focus lens provided in the second embodiment of the present invention in a possible implementation manner, and the fixed focus lens in table 3 corresponds to the fixed focus lens shown in fig. 4.
The surface numbers in table 3 are numbered according to the surface order of the respective lenses, where "OBJ" represents the object plane, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, "STO" represents the stop 170, and so on; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface curved to the image plane side, a negative value represents the surface curved to the object plane side, wherein "Infinity" represents the surface as a plane and the radius of curvature is Infinity; thickness represents the center axial distance from the current surface to the next surface, and the radius of curvature and thickness are each in millimeters (mm). Refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light, space represents the current position as air, and refractive index is 1; the Abbe number (vd) represents the dispersive properties of the material to light between the current surface and the next surface, and the space represents the current position as air.
Table 3 design values of optical physical parameters of fixed focus lens
| Face number | Surface type | Radius of curvature | Thickness of (L) | Nd | Vd |
| OBJ | Spherical surface | Infinity | Infinity | ||
| S1 | Spherical surface | 14.469 | 5.699 | 1.91 | 35.3 |
| S2 | Spherical surface | 22.974 | 1.029 | ||
| S3 | Spherical surface | -19.429 | 0.786 | 1.81 | 25.5 |
| S4 | Spherical surface | 13.912 | 3.330 | ||
| STO | Spherical surface | Infinity | 0.300 | ||
| S6 | Spherical surface | 23.795 | 2.475 | 2.00 | 25.4 |
| S7 | Spherical surface | -58.168 | 0.075 | ||
| S8 | Spherical surface | 12.257 | 3.638 | 1.92 | 20.9 |
| S9 | Spherical surface | 6.237 | 4.517 | 1.59 | 68.3 |
| S10 | Spherical surface | -18.399 | 1.234 | ||
| S11 | Aspherical surface | 12.652 | 4.886 | 1.69 | 53.2 |
| S12 | Aspherical surface | 7.957 | 1.514 | ||
| S13 | Spherical surface | Infinity | 0.600 | 1.52 | 64.2 |
| S14 | Spherical surface | Infinity | 3.261 |
The aspherical surface satisfies:
wherein Z represents the axial sagittal height of the aspheric surface in the Z direction; r represents the distance from the point on the aspherical surface to the optical axis; c represents the curvature of the fitting sphere, and is the inverse of the curvature radius in value; k represents a fitting cone coefficient; A. b, C, D, E, F the coefficients of the aspheric polynomials of order 4, 6, 8, 10, 12 and 14 respectively.
Table 4 details the aspherical coefficients of the lenses in this example two in one possible implementation, by way of example.
Table 4 design value of aspherical coefficient in fixed focus lens
| Face number | k | A | B | C | D | E | F |
| S11 | 3.478 | -3.58E-04 | -7.14E-06 | 1.68E-07 | -2.56E-09 | -1.92E-10 | 4.59E-12 |
| S12 | 0.499 | -1.16E-04 | -1.62E-05 | 1.77E-06 | -8.12E-08 | 1.14E-09 | 4.00E-11 |
Wherein, -3.58E-04 represents that the coefficient A with the surface number S11 is-3.58 x 10 -4 And so on.
Further, fig. 5 is a light ray fan diagram of a fixed focus lens in the second embodiment of the present invention, as shown in fig. 5, the imaging ranges of the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) under different angles of view of the fixed focus lens are smaller and the curves are very concentrated, so that the aberration of different field areas is ensured to be smaller, that is, the fixed focus lens is illustrated to correct the aberration of the optical system better.
Fig. 6 is a vertical axis chromatic aberration chart of a fixed focus lens in the second embodiment of the invention, as shown in fig. 6, the vertical direction represents normalization of the angle of view, 0 represents the maximum radius of view on the optical axis, the vertical direction represents the offset of the reference meridian range (vertical axis), and the horizontal direction represents the unit micrometers (μm), and as can be seen from fig. 6, the vertical axis chromatic aberration can be controlled within the (-2 μm,2 μm) range, which indicates that the chromatic aberration of the fixed focus lens is better controlled.
Example III
Fig. 7 is a schematic structural diagram of a fixed-focus lens according to a third embodiment of the present invention, as shown in fig. 7, the fixed-focus lens according to the third embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110 has positive power, the second lens 120 has negative power, the third lens 130 has positive power, the fourth lens 140 has negative power, the fifth lens 150 has positive power, and the sixth lens 160 has positive or negative power; the fourth lens 140 and the fifth lens 150 constitute a cemented lens group; diaphragm 170 is positioned in the optical path between second lens 120 and third lens 130; the filter 180 is located in the optical path between the sixth lens 160 and the image plane. Various parameter settings of each lens are described in the first embodiment and will not be described in detail herein. The arrangement shown in fig. 7 is only illustrative, and in other embodiments, the diaphragm 170 may be disposed in the optical path between the first lens 110 and the second lens 120, or in the optical path between the third lens 130 and the fourth lens 140.
For example, table 5 details specific optical physical parameters of each lens in the fixed focus lens provided in the third embodiment of the present invention in a possible implementation manner, where the fixed focus lens in table 5 corresponds to the fixed focus lens shown in fig. 7.
The surface numbers in table 5 are numbered according to the surface order of the respective lenses, where "OBJ" represents the object plane, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, "STO" represents the stop 170, and so on; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface curved to the image plane side, a negative value represents the surface curved to the object plane side, wherein "Infinity" represents the surface as a plane and the radius of curvature is Infinity; thickness represents the center axial distance from the current surface to the next surface, and the radius of curvature and thickness are each in millimeters (mm). Refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light, space represents the current position as air, and refractive index is 1; the Abbe number (vd) represents the dispersive properties of the material to light between the current surface and the next surface, and the space represents the current position as air.
Table 5 design values of optical physical parameters of fixed focus lens
| Facial sequenceNumber (number) | Surface type | Radius of curvature | Thickness of (L) | Nd | Vd |
| OBJ | Spherical surface | Infinity | Infinity | ||
| S1 | Spherical surface | 14.617 | 3.551 | 1.91 | 33.3 |
| S2 | Spherical surface | 18.974 | 1.288 | ||
| S3 | Spherical surface | -15.545 | 0.799 | 1.70 | 27.4 |
| S4 | Spherical surface | 78.185 | 4.808 | ||
| STO | Spherical surface | Infinity | 0.300 | ||
| S6 | Spherical surface | 23.704 | 2.131 | 1.95 | 23.8 |
| S7 | Spherical surface | -328.566 | 0.075 | ||
| S8 | Spherical surface | 13.929 | 3.296 | 2.01 | 21.0 |
| S9 | Spherical surface | 6.584 | 3.389 | 1.57 | 71.7 |
| S10 | Spherical surface | -30.330 | 1.098 | ||
| S11 | Aspherical surface | 9.187 | 4.645 | 2.05 | 37.2 |
| S12 | Aspherical surface | 7.214 | 1.514 | ||
| S13 | Spherical surface | Infinity | 0.600 | 1.52 | 64.2 |
| S14 | Spherical surface | Infinity | 4.524 |
The aspherical surface satisfies:
wherein Z represents the axial sagittal height of the aspheric surface in the Z direction; r represents the distance from the point on the aspherical surface to the optical axis; c represents the curvature of the fitting sphere, and is the inverse of the curvature radius in value; k represents a fitting cone coefficient; A. b, C, D, E, F the coefficients of the aspheric polynomials of order 4, 6, 8, 10, 12 and 14 respectively.
Table 6 details the aspherical coefficients of the lenses in this example three, by way of example, in one possible implementation.
TABLE 6 design value of aspherical coefficient in fixed focus lens
| Face number | k | A | B | C | D | E | F |
| S11 | 1.138 | -1.12E-04 | -3.51E-06 | 2.26E-08 | 4.89E-10 | 1.31E-11 | -3.00E-12 |
| S12 | 1.216 | 9.55E-05 | -4.29E-05 | 3.58E-06 | -1.05E-07 | -3.17E-09 | 2.07E-10 |
Wherein, -1.12E-04 represents that the coefficient A with the surface number S11 is-1.12 x 10 -4 And so on.
Further, fig. 8 is a light ray fan diagram of a fixed focus lens in the third embodiment of the present invention, as shown in fig. 8, the imaging ranges of the light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm) under different angles of view of the fixed focus lens are smaller and the curves are very concentrated, so that the aberration of different field areas is ensured to be smaller, that is, the fixed focus lens is illustrated to correct the aberration of the optical system better.
Fig. 9 is a vertical axis chromatic aberration chart of a fixed focus lens in the third embodiment of the invention, as shown in fig. 9, the vertical direction represents normalization of the angle of view, 0 represents the maximum radius of view on the optical axis, the vertical direction represents the offset of the reference meridian range (vertical axis), and the horizontal direction represents the unit micrometers (μm), and as can be seen from fig. 9, the vertical axis chromatic aberration can be controlled within the (0, 5 μm) range, which indicates that the chromatic aberration of the fixed focus lens is better controlled.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A fixed focus lens, comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the components of the fixed focus lens having optical refractive power are only the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens;
the first lens has positive focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the sixth lens has positive or negative focal power;
the fourth lens and the fifth lens form a cemented lens group;
the focal power of the fixed focus lens isThe first lens has optical power of +.>The focal power of the second lens isThe third lens has optical power of +>The focal power of the fourth lens is +.>The focal power of the fifth lens isThe focal power of the sixth lens is +.>Wherein:
2. the fixed focus lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass lenses.
3. The fixed focus lens of claim 1 wherein the sixth lens is a glass aspheric lens.
4. The fixed focus lens of claim 1, wherein a surface of the lens adjacent to the object plane side is an object side surface, and a surface of the lens adjacent to the image plane side is an image side surface;
the object side surface of the first lens is convex towards the object plane, and the image side surface of the first lens is concave towards the image plane;
the object side surface of the second lens is sunken towards the object plane, and the image side surface of the second lens is sunken towards the image plane;
the object side surface of the third lens is convex towards the object plane, and the image side surface of the third lens is convex towards the image plane;
the object side surface of the fourth lens is convex towards the object plane, and the image side surface of the fourth lens is concave towards the image plane;
the object side surface of the fifth lens is convex towards the object plane, and the image side surface of the fifth lens is convex towards the image plane;
the object side surface of the sixth lens is convex towards the object plane, and the image side surface of the sixth lens is concave towards the image plane.
5. The fixed focus lens of claim 1, wherein the second lens has a refractive index nd2 and an abbe number vd2; the refractive index of the fourth lens is nd4, and the Abbe number is vd4; the refractive index of the sixth lens is nd6, and the Abbe number is vd6; wherein:
0.05＜nd2/vd2＜0.08；0.06＜nd4/vd4＜0.10；0.01＜nd6/vd6＜0.06。
6. the fixed focus lens of claim 1, wherein a distance from an optical axis center of an object side of the first lens element to an image plane is TTL, and a distance from an optical axis center of an image side of the sixth lens element to the image plane is BFL, wherein:
0.05＜BFL/TTL＜0.31。
7. the fixed focus lens of claim 1, further comprising a stop;
the diaphragm is positioned in the light path between the second lens and the third lens;
alternatively, the diaphragm is located in the optical path between the first lens and the second lens;
alternatively, the diaphragm is located in the optical path between the third lens and the fourth lens.
8. The fixed focus lens of claim 1, further comprising an optical filter;
the optical filter is positioned in the optical path between the sixth lens and the image plane.
9. A fixed focus lens as claimed in claim 3, wherein the aspherical surface of the glass aspherical lens satisfies:
wherein Z represents the axial sagittal height of the aspheric surface in the Z direction; r represents the distance from the point on the aspherical surface to the optical axis;
c represents the curvature of the fitting sphere, and is the inverse of the curvature radius in value; k represents a fitting cone coefficient; A. b, C, D, E, F the coefficients of the aspheric polynomials of order 4, 6, 8, 10, 12 and 14 respectively.
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