CN112987263A - Fixed-focus lens and imaging device - Google Patents
Fixed-focus lens and imaging device Download PDFInfo
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- CN112987263A CN112987263A CN202110456713.9A CN202110456713A CN112987263A CN 112987263 A CN112987263 A CN 112987263A CN 202110456713 A CN202110456713 A CN 202110456713A CN 112987263 A CN112987263 A CN 112987263A
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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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses a fixed focus lens and imaging equipment, wherein the fixed focus lens sequentially comprises the following components from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens with positive focal power has a convex object-side surface and has inflected points on both the object-side surface and the image-side surface; a diaphragm; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a seventh lens element with positive optical power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, the seventh lens element having an inflection point on both the object-side surface and the image-side surface. The fixed-focus lens has the advantages of large aperture, miniaturization, light weight, super-large wide angle and the like.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a fixed-focus lens and imaging equipment.
Background
The development of mobile interconnection, in addition to the popularity of social contact, video and live broadcast software, people are more and more high to photographic liking degree, and the pursuit to the imaging effect is also more diversified, not only the image quality of high definition is required, but also the super large field of vision is required in order to shoot the strong picture of visual impact force on a large scale, and unmanned aerial vehicle has won the liking of consumer with its unique high altitude visual angle and wide shooting picture. At present, unmanned aerial vehicles develop rapidly, and the corresponding demand for optical lenses matched with the unmanned aerial vehicles is higher and higher.
Because the unmanned aerial vehicle is mostly used in complex environments such as severe vibration, high pressure, extreme temperature and the like, the requirement on the performance of the matched optical lens is extremely high, the unmanned aerial vehicle has good thermal stability to adapt to outdoor severe environments, and light appearance and small weight are required to increase the endurance time of the unmanned aerial vehicle during high-altitude flight shooting; still require the camera lens to have big light ring simultaneously in order to satisfy unmanned aerial vehicle can both shoot clear and vivid picture in changeable environment such as daytime night. At present, the diversified use requirements of the unmanned aerial vehicle can be hardly met by the conventional optical lens in the market.
Disclosure of Invention
Therefore, the invention aims to provide a fixed-focus lens and imaging equipment, which at least have the advantages of large aperture, miniaturization, light weight and super-large wide angle and can meet diversified use requirements in the fields of unmanned aerial vehicles, motion cameras and the like.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides a fixed focus lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens having positive optical power, an object of the third lensThe side surface is a convex surface, and the object side surface and the image side surface of the third lens are both provided with inflection points; a diaphragm; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces; the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; a seventh lens having a positive optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having an inflection point; the fixed-focus lens at least comprises a glass lens and a plastic lens; the prime lens meets the following conditional expression: 1.2< f/SDST<1.5, wherein f represents the focal length of the fixed-focus lens, SDSTRepresenting the maximum aperture of the diaphragm.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the fixed-focus lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the fixed-focus lens into an electrical signal.
Compared with the prior art, the fixed-focus lens and the imaging equipment provided by the invention adopt a mixed matching structure of the glass lens and the plastic lens, so that the weight and the cost of the lens are effectively reduced, and the influence of temperature change on imaging can be compensated; the arrangement among the lenses is compact, so that the length of the lens is effectively reduced; the diaphragm and each lens structure of camera lens set up rationally, can make the light quantity of wider scope get into the fuselage, satisfy the formation of image demand of light and shade environment.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a fixed-focus lens according to a first embodiment of the present invention;
FIG. 2 is an MTF chart of a fixed-focus lens according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a distortion curve of a fixed-focus lens according to a first embodiment of the present invention;
FIG. 4 is a graph showing an axial chromatic aberration of point-to-spherical aberration of a fixed focus lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a fixed-focus lens according to a second embodiment of the present disclosure;
FIG. 6 is an MTF chart of a fixed-focus lens according to a second embodiment of the present invention;
FIG. 7 is a diagram illustrating a distortion curve of a fixed-focus lens according to a second embodiment of the present invention;
FIG. 8 is a graph showing an on-axis spherical aberration of a fixed focus lens according to a second embodiment of the present invention;
fig. 9 is a schematic structural view of an image forming apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides a fixed focus lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the optical center of each lens is positioned on the same straight line.
The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the object side surface and the image side surface of the third lens both have inflexion points;
the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens element has a positive optical power, an object-side surface of the seventh lens element is convex at a paraxial region, an image-side surface of the seventh lens element is concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens element have at least one inflection point.
The diaphragm can be made of shading paper with a light through hole in the center, and the light through aperture of the diaphragm is smaller than the space ring, so that the light through amount of the fixed-focus lens is determined by the light through aperture of the diaphragm. The diaphragm is arranged between the third lens and the fourth lens, so that the field angle of the fixed-focus lens can be improved, and the incidence angle of the chip can be better matched; the shading paper with the light through hole in the center is used as the diaphragm, so that the requirement of the light through hole of the lens cone can be reduced, the forming difficulty of the light through hole of the lens cone is reduced, the production efficiency is improved, and the production cost is reduced.
In some embodiments, to reduce the weight and the unit price of the lens, the fixed-focus lens includes at least one lens made of plastic; meanwhile, in order to enable the lens to have good thermal stability, the fixed-focus lens further comprises at least one lens made of glass materials. Specifically, the fixed-focus lens consists of five plastic lenses and two glass lenses, and the glass-plastic mixed structure is adopted, so that the volume and the weight of the lens can be greatly reduced, the fixed-focus lens is suitable for mass production, and meanwhile, the stability of the imaging performance of the lens in a high-temperature and low-temperature environment is ensured to the greatest extent.
In some embodiments, in order to improve the resolution of the lens and effectively reduce the vertical axis chromatic aberration of the lens, the fixed-focus lens adopts a plurality of aspheric lenses, and the use of the aspheric lenses can better correct the aberration of the lens, improve the resolution of the lens and enable the image to be clearer. Specifically, the first lens in the fixed-focus lens is a glass spherical lens, the fifth lens is a glass aspheric lens, and the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are plastic aspheric lenses.
In some embodiments, the first lens and the fifth lens are both glass lenses, wherein the first lens is made of a hard glass material and is plated with a scratch-proof hard film, so as to ensure that the lens is not easy to scratch during use and assembly, and the imaging quality is affected. The fifth lens can adopt glass spherical or aspheric surface glass, can effectively correct chromatic aberration, and compensate image quality change caused by temperature change.
In some embodiments, to correct for lens distortion and ray aberrations at different apertures, the object and image sides of the third and seventh lenses each have an inflection point.
In some embodiments, in order to make the lens have the largest possible light entering amount to meet the requirement of photographing in a bright and dark environment, the fixed-focus lens satisfies the following conditional expression:
1.2< f/SDST<1.5；（1）
wherein f denotes the focal length of the fixed focus lens, SDST The maximum aperture of the diaphragm is indicated. The condition formula (1) is met, so that the lens has the characteristic of an oversized aperture, the light entering amount is enough under the condition of ensuring the imaging quality, and the imaging requirement of a light and dark environment is met.
In some embodiments, to reduce the head size of the lens, the fixed-focus lens satisfies the following conditional expression:
1.7< SD1/SD14 <2.0；（2）
where SD1 denotes the maximum effective radius of the object-side surface of the first lens, and SD14 denotes the maximum effective radius of the image-side surface of the seventh lens. Satisfying above-mentioned conditional expression (2), can reducing the head size of camera lens, make the camera lens external diameter size keep unanimous, be favorable to realizing the miniaturization of camera lens. Generally, the outer diameter of the last lens in the lens is basically consistent with the size of the matched imaging chip due to the requirement of a small-angle incidence chip; because of being big wide-angle lens, the size of first lens is bigger to the volume influence of whole camera lens, through the radius ratio of rationally setting up first lens and last lens, is favorable to realizing the miniaturization of camera lens.
In some embodiments, the prime lens satisfies the following conditional expression:
190°<FOV<220°；（3）
5.2mm<IH<6mm；（4）
where FOV indicates the angle of view of the fixed focus lens, and IH indicates the image plane size corresponding to the angle of view of the fixed focus lens. The requirements of the conditional expressions (3) and (4) are met, the fixed-focus lens can be ensured to have a larger angle of view and an imaging surface, and the imaging requirements of a large-target-surface COMS chip can be matched.
In some embodiments, the fixed-focus lens satisfies the conditional expression:
1.95<TTL/IH<2.1；（5）
wherein TTL denotes an optical total length of the fixed focus lens, and IH denotes an image plane size corresponding to a field angle of the fixed focus lens. The condition formula (5) is satisfied, and the total length and the volume of the lens are effectively controlled while the lens is ensured to have a larger imaging surface.
In some embodiments, the fixed-focus lens satisfies the conditional expression:
0.3< RS2/SD2<0.4；（6）
where RS2 denotes the rise of the image side surface of the first lens, and SD2 denotes the maximum effective radius of the image side surface of the first lens. Satisfying the above conditional expression (6), the first lens can have a sufficient field angle to satisfy the light entrance requirement of the ultra-large field of view.
In some embodiments, the prime lens satisfies the following conditional expression:
1.5< f5/f <1.9；（7）
where f5 denotes a focal length of the fifth lens, and f denotes a focal length of the prime lens. The fifth lens is a glass aspheric lens and plays a key role in the imaging stability of the whole lens in high and low temperature environments; satisfy above-mentioned conditional expression (7), the compensation ability of fifth lens to the difference in temperature in the rational distribution system to guarantee that the camera lens has good thermal stability.
In some embodiments, the prime lens satisfies the following conditional expression:
8mm< R1 <12mm；（8）
2mm< R2<5mm；（9）
where R1 denotes a radius of curvature of the object-side surface of the first lens, and R2 denotes a radius of curvature of the image-side surface of the first lens. Satisfying the conditional expressions (8) and (9), the excessive projection plane of the first lens can be reduced, the overlarge field angle of the lens can be avoided, the processing difficulty can be effectively reduced, and the processability can be improved.
In some embodiments, the prime lens satisfies the following conditional expression:
0.5< RS13/SD13 <0.7；（10）
where RS13 denotes the rise of the object side surface of the seventh lens, and SD13 denotes the maximum effective radius of the object side surface of the seventh lens. Satisfying the above conditional expression (10), the incident angle of the peripheral field on the seventh lens can be reduced, and excessive high-order aberration is avoided.
In some embodiments, to satisfy the requirement of good light receiving of the lens chip, the fixed-focus lens satisfies the following conditional expression:
0.93< SD14/IH <0.98；（11）
SD14 denotes the maximum effective radius of the image-side surface of the seventh lens element, and IH denotes the image plane size corresponding to the field angle of the fixed-focus lens. Satisfying the above conditional expression (11), the light passing through the lens group can be ensured to be received into the chip more smoothly, and the requirement of the chip on the best CRA (chief ray incident angle) can be satisfied.
In some embodiments, the prime lens satisfies the following conditional expression:
0.4< DS7/DS3 <0.55；（12）
where DS3 represents the effective diameter of the object-side surface of the second lens and DS7 represents the effective diameter of the object-side surface of the fourth lens. By setting the aperture of the front and rear lenses of the diaphragm, a good light-collecting effect is achieved, and the maximum light-transmitting amount is ensured while the lens has a sufficient field angle, while satisfying the conditional expression (12).
In some embodiments, the prime lens satisfies the following conditional expression:
4<CT5/CT6 <5.5；（13）
where CT5 denotes the center thickness of the fifth lens, and CT6 denotes the center thickness of the sixth lens. Satisfying the above conditional expression (13), the collocation between the positive and negative focal power lenses can be effectively balanced to effectively compensate the MTF variation caused by the temperature variation.
In some embodiments, to correct chromatic aberration of the lens, the fixed-focus lens satisfies the following conditional expression:
20<Vd5-Vd4<40；（14）
vd4 represents the abbe number of the fourth lens, and Vd5 represents the abbe number of the fifth lens. Satisfying the above conditional expression (14), the lens material can be selected more easily, and the chromatic aberration correction of the lens is facilitated, so that the picture shot by the lens has higher color reduction degree, and the purple edge and red edge phenomena are effectively corrected.
The invention is further illustrated below in the following examples. In each embodiment, the thickness, the curvature radius, and the material selection part of each lens in the fixed-focus lens are different, and the specific difference can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In the embodiments of the present invention, when the lenses in the fixed focus lens are aspheric lenses, each aspheric surface type satisfies the following equation:
wherein z is an aspheric surface along the optical axisAt the height h, the rise of the distance from the aspheric apex, c is the paraxial curvature of the surface, A2iIs aspheric surface type coefficient of 2i order, k is conic coefficient, when k is less than-1, the curve is hyperbolic curve, when k is equal to-1, it is parabolic curve, when k is between-1 and 0, it is elliptic curve, when k is equal to 0, it is circular curve, when k is greater than 0, it is oblate curve. The surface shape and size of the front and back aspheric surfaces of the lens can be accurately set through the parameters. The aspheric surface shape meets an even-order aspheric surface equation, and different aspheric surface coefficients are utilized, so that the aspheric surface plays the most role in the system, and more perfect resolving power is obtained.
First embodiment
Referring to fig. 1, a schematic structural diagram of a fixed focus lens 100 according to a first embodiment of the present invention is shown, where the fixed focus lens 100 sequentially includes, from an object side to an image plane along an optical axis: the optical center of each lens is positioned on the same straight line, namely, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has negative focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave;
the third lens L3 has positive optical power, the object-side surface S5 of the third lens is convex, the image-side surface S6 of the third lens is nearly planar at the paraxial region, and both the object-side surface S5 and the image-side surface S6 of the third lens have a point of inflection;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex;
the fifth lens L5 has positive optical power, and both the object-side surface S9 and the image-side surface S10 of the fifth lens are convex;
the sixth lens L6 has negative power, and the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex;
the seventh lens element L7 has positive optical power, the object-side surface S13 of the seventh lens element is convex at the paraxial region, the image-side surface S14 of the seventh lens element is concave at the paraxial region, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element have a point of inflection.
The first lens element L1 is a glass spherical lens element, the fifth lens element L6 is a glass aspherical lens element, and the second lens element L2, the third lens element L3, the fourth lens element L4, the sixth lens element L6 and the seventh lens element L7 are all plastic aspherical lens elements.
Table 1 shows relevant parameters of each lens of the fixed focus lens 100 according to this embodiment.
TABLE 1
Table 2 shows relevant parameters of the aspherical lens of the fixed focus lens 100 in this embodiment.
TABLE 2
Referring to fig. 2, an MTF graph of the fixed-focus lens 100 in the present embodiment is shown, and it can be seen from the graph that the MTF value of the lens within 0.9 field of view is above 0.5 at the spatial frequency of 63lp/mm, which indicates that the fixed-focus lens 100 has a higher resolution.
Referring to fig. 3, an F-Theta distortion diagram of the fixed-focus lens 100 in the present embodiment is shown, and it can be seen from the diagram that the F-Theta distortion of the lens is smaller and less than 8%, and is a positive distortion, which indicates that the distortion of the fixed-focus lens 100 is well corrected.
Referring to fig. 4, a graph of on-axis spherical aberration of the fixed focus lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the graph that the offset of the chromatic aberration is controlled within ± 0.02 mm, which illustrates that the fixed focus lens 100 can effectively correct the on-axis spherical aberration.
Second embodiment
Referring to fig. 5, a schematic structural diagram of a fixed focus lens 200 according to the present embodiment is shown, where the surface type of each lens of the fixed focus lens 200 in the present embodiment is substantially the same as that of each lens of the fixed focus lens 100 in the first embodiment, and the difference is that: the radius of curvature, thickness of each lens and air space between each lens are different. Table 3 shows the relevant parameters of each lens of the fixed-focus lens 200 in this embodiment.
TABLE 3
Table 4 shows relevant parameters of the aspherical lens of the fixed focus lens 200 in this embodiment.
TABLE 4
Referring to fig. 6, which is an MTF graph of the fixed-focus lens 200 in the present embodiment, the MTF value of the lens within 0.9 field of view is above 0.6 at the spatial frequency of 63lp/mm, which indicates that the fixed-focus lens 200 has a higher resolution.
Referring to fig. 7, an F-Theta distortion diagram of the fixed focus lens 200 in the present embodiment is shown, and it can be seen from the diagram that the F-Theta distortion of the lens is smaller and less than 9%, and is a positive distortion, which indicates that the distortion of the fixed focus lens 200 is well corrected.
Referring to fig. 8, a graph of on-axis spherical aberration of the fixed focus lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the graph that the offset amount of the chromatic aberration is controlled within ± 0.02 mm, which illustrates that the fixed focus lens 200 can effectively correct the on-axis spherical aberration.
Please refer to table 5, which shows the optical characteristics corresponding to the fixed focus lens provided in the two embodiments, including the total optical length TTL, the F-number F # and the focal length F of the fixed focus lens, and further including the corresponding correlation values of each of the conditional expressions.
TABLE 5
In conclusion, the prime lens provided by the invention adopts a glass-plastic mixed matching structure, and particularly adopts two glass lenses and five plastic lenses in a specified position sequence, so that the lens has good imaging quality in high and low temperature environments, the weight and the volume of the lens are effectively reduced, and the processing cost is reduced; meanwhile, the lenses are compactly arranged, so that the length of the lens is effectively reduced, and the head of the lens is smaller, so that the lens has smaller volume; and because the diaphragm and each lens structure of camera lens set up rationally, can make the light quantity of wider scope get into the fuselage, satisfy the imaging demand of light and shade environment.
Third embodiment
Referring to fig. 9, an imaging device 300 according to a third embodiment of the present invention is shown, where the imaging device 300 may include an imaging element 310 and a fixed-focus lens (e.g., the fixed-focus lens 100) in any of the embodiments. The imaging element 310 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 300 may be an electronic device loaded with the fixed-focus lens in any form of an unmanned aerial vehicle, a motion camera, a smart phone, a tablet computer, or any other form.
The imaging device 300 that this application embodiment provided includes fixed focus lens 100, because fixed focus lens 100 has big light ring, super large wide angle, miniaturization, light in weight, advantages such as thermal stability is good and high pixel, imaging device 300 that has this fixed focus lens 100 also has big light ring, super large wide angle, miniaturization, light in weight, advantages such as thermal stability is good and high pixel, can satisfy diversified user demands such as unmanned aerial vehicle, motion camera, panoramic camera.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A fixed focus lens, comprising in order from an object side to an image plane along an optical axis:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the object side surface and the image side surface of the third lens both have an inflection point;
a diaphragm;
the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
a seventh lens having a positive optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having an inflection point;
the fixed-focus lens at least comprises a glass lens and a plastic lens;
the prime lens meets the following conditional expression:
1.2< f/SDST<1.5；
wherein f denotes a focal length of the prime lens, SDST Representing the maximum aperture of the diaphragm.
2. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
1.7< SD1/SD14 <2.0；
wherein SD1 represents the maximum effective radius of the object side surface of the first lens, and SD14 represents the maximum effective radius of the image side surface of the seventh lens.
3. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
190°<FOV<220°；
5.2mm<IH<6mm；
wherein FOV represents the angle of view of the fixed focus lens, and IH represents the image plane size corresponding to the angle of view of the fixed focus lens.
4. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
1.95<TTL/IH<2.1；
wherein, TTL represents the total optical length of the fixed focus lens, and IH represents the image plane size corresponding to the field angle of the fixed focus lens.
5. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
0.3< RS2/SD2 <0.4；
wherein RS2 represents the rise of the image-side surface of the first lens and SD2 represents the maximum effective radius of the image-side surface of the first lens.
6. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
1.5< f5/f <1.9；
where f5 denotes a focal length of the fifth lens, and f denotes a focal length of the prime lens.
7. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
8.0mm < R1<12mm；
2mm < R2<5mm；
wherein R1 denotes a radius of curvature of an object side surface of the first lens, and R2 denotes a radius of curvature of an image side surface of the first lens.
8. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
0.5< RS13/SD13 <0.7；
wherein RS13 denotes a rise of an object side of the seventh lens, and SD13 denotes a maximum effective radius of the object side of the seventh lens.
9. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
0.93<SD14/IH<0.98；
where SD14 denotes a maximum effective radius of an image-side surface of the seventh lens element, and IH denotes an image plane size corresponding to a field angle of the fixed-focus lens.
10. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
0.4< DS7/DS3<0.55；
wherein DS3 represents the effective diameter of the object side of the second lens and DS7 represents the effective diameter of the object side of the fourth lens.
11. The fixed focus lens according to claim 1, wherein the fixed focus lens satisfies the following conditional expression:
4<CT5/CT6 <5.5；
wherein CT5 represents the center thickness of the fifth lens and CT6 represents the center thickness of the sixth lens.
12. The prime lens according to claim 1, wherein the first lens is a glass spherical lens, the fifth lens is a glass aspherical lens, and the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are plastic aspherical lenses.
13. An imaging apparatus comprising the prime lens according to any one of claims 1 to 12 and an imaging element for converting an optical image formed by the prime lens into an electrical signal.
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| CN114509863A (en) * | 2022-04-20 | 2022-05-17 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
| TWI822424B (en) * | 2022-07-14 | 2023-11-11 | 南韓商三星電機股份有限公司 | Imaging lens system |
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