CN210427922U - Miniature imaging lens for close-range imaging - Google Patents
Miniature imaging lens for close-range imaging Download PDFInfo
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Abstract
The utility model discloses a closely form images and use miniature imaging lens, wherein: in order from an object side to an image side along an optical axis: the lens comprises a first lens group, a diaphragm and a second lens group; the first lens group and the second lens group are both positive focal power; the object space clear aperture of the first lens group is larger than the image space clear aperture thereof, the object space clear aperture of the second lens group is smaller than the image space clear aperture thereof, and specific process parameters are given. The utility model provides a lens configuration with a sandwich structure, which consists of a first lens group, a diaphragm and a second lens group, can obtain higher close-range imaging effect under the condition of miniaturization, and can effectively reduce the aberration, especially distortion and chromatic aberration during close-range imaging; the diameter of the lens can be effectively reduced, the size of the lens is reduced, the processing difficulty and the processing cost are reduced, and the total optical cylinder length of a structure consisting of the lens and the detector can be effectively reduced.
Description
Technical Field
The utility model belongs to the formation of image field, concretely relates to miniature imaging lens is used in closely formation of image, the portable electronic product of specially adapted closely forms of image.
Background
Imaging devices are increasingly popular in life, and imaging devices such as mobile phone cameras, computer cameras, automobile data recorders and monitoring cameras are in daily life of people every day. The imaging is also increasingly being miniaturized and still maintaining high imaging quality. Most of imaging apparatuses in daily life are camera systems. The camera system is characterized by an object distance much larger (much larger than a ratio of 10 times or more) than the image distance, and usually the farthest object plane is at infinity. The miniaturized imaging device is a compact structure, the distance between a lens and a detector is usually short, the distance from a shot object to the lens is usually far larger than the distance from the lens to the detector, and the miniaturized imaging device is also a rational chapter as a photographic system.
However, as people increasingly demand the functionality of imaging devices in their daily lives, there is also a need to image close-range objects, such as macro-imaging and even microscopic imaging. However, most of the conventional imaging devices are camera systems, and the lens thereof is designed for long-distance imaging, and although the object distance can be reduced by increasing the image distance to image a short-distance object, the imaging device is far from the optimal imaging conditions, and a large aberration occurs, resulting in poor imaging quality. There is therefore a need for a lens barrel capable of high-quality close-range imaging.
SUMMERY OF THE UTILITY MODEL
Aiming at least one of the defects or the improvement requirements in the prior art, the utility model discloses a miniature imaging lens for close-range imaging provides a lens configuration of a sandwich structure consisting of a first lens group, a diaphragm and a second lens group, can obtain higher close-range imaging effect under the condition of miniaturization, and can effectively reduce the aberration, especially distortion and chromatic aberration during close-range imaging; the diameter of the lens can be effectively reduced, the size of the lens is reduced, the processing difficulty and the processing cost are reduced, and the total optical cylinder length of a structure consisting of the lens and the detector can be effectively reduced.
In order to achieve the above object, according to an aspect of the present invention, there is provided a miniature imaging lens for close-range imaging, wherein: in order from an object side to an image side along an optical axis: the lens comprises a first lens group, a diaphragm and a second lens group;
the first lens group and the second lens group are both positive focal power; the object space clear aperture of the first lens group is larger than the image space clear aperture of the first lens group, and the object space clear aperture of the second lens group is smaller than the image space clear aperture of the second lens group; focal length f of the first lens group100Less than or equal to 40mm, and the focal length f of the second lens group200≤20mm；
When in use, the distance od between the object to be shot and the object main surface of the first lens group100Less than 2 times the focal length of the first lens group 100, i.e.
od100<2f100(relation 1);
and the distance id from the image side main surface to the image surface of the second lens group200Less than twice the focal length of the second lens group, i.e.
Id200<2f200(relation 2);
and an image-side Numerical Aperture (NA) of the first lens groupimg100An object numerical aperture NA of the second lens groupobj200The following conditions are satisfied:
0<NAimg100，NAobj200<0.05 (relation 3).
Preferably, the aperture stop is to an edge of the first lens groupDistance sd in the optical axis direction100Satisfy the relation:
sd100<f100(relation 4);
a distance sd in an optical axis direction from the aperture to an edge of the second lens group200Satisfy the relation:
sd200<f200(relational expression 5).
Preferably, the second lens group comprises at least three lenses in order from the object side to the image side along the optical axis.
Preferably, the last two lenses of the second lens group arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface and the image side surface of the last lens are both concave surfaces, and at least one of the object side surface and the image side surface of the last lens is an aspheric surface.
Preferably, the last two lenses of the second lens group arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the smallest center thickness and the larger off-axis thickness.
Preferably, the last two lenses of the second lens group arranged in order from the object side to the image side along the optical axis are as follows:
the object side surface of the penultimate lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface;
the object side surface of the last lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface.
Preferably, the last two lenses of the second lens group arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the largest central thickness and the smaller off-axis thickness.
Preferably, at least one of the object side surface and the image side surface of the last lens has an inflection point.
Preferably, the second lens group includes, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
the object side surface and the image side surface of the second lens are both concave surfaces;
the center of the object side surface of the third lens is a convex surface, then the off-axis periphery is changed into a concave surface, the center of the image side surface is a concave surface, and then the off-axis periphery is changed into a convex surface;
the image side surface of the fourth lens is a convex surface, and at least one of the object side surface and the image side surface of the fourth lens is an aspheric surface;
the object side surface and the image side surface of the fifth lens are both concave surfaces, and at least one of the object side surface and the image side surface of the fifth lens is an aspheric surface.
Preferably, the second lens group includes, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
the object space surface and the image space surface of the second lens are both concave surfaces, wherein the concave degree of the object space surface is greater than that of the image space surface, and the image space surface is provided with an inflection point;
a third lens element having a convex image-side surface, and at least one of the object-side surface and the image-side surface being aspheric;
the fourth lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric and has a region with a smallest center thickness and a larger thickness on an off-axis.
Preferably, the second lens group includes, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
a second lens, the object side surface of which is convex and the image side surface of which is concave;
the center of the object side surface of the third lens is a convex surface, then the off-axis periphery is changed into a concave surface, the center of the image side surface is a concave surface, and then the off-axis periphery is changed into a convex surface;
a fourth lens, the object side surface of which is concave and the image side surface of which is convex;
a fifth lens element having a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric;
the sixth lens element has a concave object-side surface and a convex image-side surface, and at least one of the object-side surface and the image-side surface is aspheric.
Preferably, the second lens group includes, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
a second lens element having a convex image-side surface and at least one of an object-side surface and the image-side surface being aspheric;
the third lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric and has a region with a maximum center thickness and a smaller thickness away from the axis.
Preferably, the first lens group includes at least three lenses in order from an object side to an image side along an optical axis.
Preferably, the first two lenses of the first lens group arranged in order from the object side to the image side along the optical axis are as follows:
the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface;
the second lens element has a convex image surface, and at least one of the object surface and the image surface is aspheric.
Preferably, the first two lenses of the first lens group arranged in order from the object side to the image side along the optical axis are as follows:
the object side surface of the first lens is a concave surface, the image side surface is a convex surface, at least one surface of the object side surface and the image side surface is an aspheric surface, and the first lens is provided with a region with the largest central thickness and the smaller off-axis thickness;
the second lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric.
Preferably, the first two lenses of the first lens group arranged in order from the object side to the image side along the optical axis are as follows:
the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface;
the object side surface of the second lens is a convex surface, and at least one of the object side surface and the image side surface of the second lens is an aspheric surface.
Preferably, at least one of the object side surface and the image side surface of the first lens has an inflection point.
Preferably, the first lens group includes, in order from an object side to an image side along an optical axis:
the first lens, its object space surface and image space surface are concave, and at least one surface in its object space surface and image space surface is the aspheric surface;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric, and has a region having a maximum center thickness and a smaller thickness on an off-axis;
the object side surface of the third lens is a concave surface, but the sinking degree of the third lens is less than that of the first lens, and the image side surface of the third lens is a concave surface;
and the object side surface and the image side surface of the fourth lens are convex surfaces.
Preferably, the first lens group includes, in order from an object side to an image side along an optical axis:
a first lens element having a concave object-side surface and a convex image-side surface, at least one of the object-side surface and the image-side surface being aspheric, and having a region with a maximum center thickness and a smaller thickness on an off-axis;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric;
and the object side surface and the image side surface of the third lens are convex surfaces.
Preferably, the first lens group includes, in order from an object side to an image side along an optical axis:
the first lens, its object space surface and image space surface are concave, and at least one surface in its object space surface and image space surface is the aspheric surface;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric, and has a region having a maximum center thickness and a smaller thickness on an off-axis;
the object side surface of the third lens is a concave surface, but the sinking degree of the third lens is smaller than that of the first lens, and the image side surface of the third lens is a convex surface;
the object side surface and the image side surface of the fourth lens are both concave surfaces;
and the object side surface and the image side surface of the fifth lens are convex surfaces.
Preferably, the miniature imaging lens for close-range imaging is a miniature imaging lens for portable electronic products.
The above-described preferred features may be combined with each other as long as they do not conflict with each other.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, has following beneficial effect:
the traditional micro lens is mostly a photographic lens, is designed aiming at the condition that the object distance is far greater than the image distance, and is not suitable for close-distance macro and micro imaging; the utility model discloses a closely form images and use miniature imaging lens, the camera lens configuration of the sandwich structure that has proposed one kind and comprises first battery of lens, light ring and second battery of lens can acquire higher closely formation of image effect under the miniaturized condition, aberration when can effectively reducing closely formation of image, especially distortion and chromatic aberration. Satisfy the utility model discloses a structural feature and parameter relational formula's camera lens can effectively reduce the diameter of camera lens, reduce the camera lens size and reduce the processing degree of difficulty and processing cost to can effectively reduce the total optics section of thick bamboo length that has the structure that camera lens and detector are constituteed.
Drawings
Fig. 1 is a schematic structural diagram of a micro imaging lens for close-range imaging according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fourth embodiment of the present invention;
fig. 6 is a schematic diagram of distortion in the field angle according to the fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 8 is a table diagram of parameters according to a first embodiment of the present invention;
fig. 9 is a second table diagram according to a first embodiment of the present invention;
FIG. 10 is a diagram of a second embodiment of the present invention;
fig. 11 is a second parameter table diagram according to a second embodiment of the present invention;
FIG. 12 is a table diagram of the third embodiment of the present invention;
FIG. 13 is a second parameter chart of the third embodiment of the present invention;
fig. 14 is one of the parameter table diagrams of the fourth embodiment of the present invention;
FIG. 15 is a second parameter chart of the fourth embodiment of the present invention;
fig. 16 is one of the table diagrams of the fifth embodiment of the present invention;
fig. 17 is a second parameter table diagram according to the fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to the following embodiments.
As a preferred embodiment of the present invention, as shown in fig. 1, the present invention provides a miniature imaging lens for close-range imaging, wherein: in order from an object side to an image side along an optical axis: a first lens group 100, a diaphragm 300 and a second lens group 200.
The first lens group 100 and the second lens group 200 are both positive focal power; the aperture of the first lens group 100 is larger than that of the image side, and the aperture of the second lens group 200 is smaller than that of the image side; focal length f of the first lens group 100100No more than 40mm, and focal length f of the second lens group 200200≤20mm；
In use, the distance od between the object 500 to be photographed and the object side main surface of the first lens group 100100Less than 2 times the focal length of the first lens group 100, i.e.
od100<2f100(relation 1);
and the distance id from the image side main surface of the second lens group (200) to the image surface200Less than twice the focal length of the second lens group 200, i.e.
Id200<2f200(relation 2);
under the conditions determined by the two formulas, the distance from the image-side surface of the second lens group 200 to the detector 600 can be significantly reduced for short-distance imaging, especially ultra-short-distance imaging, i.e. the total optical cylinder length can be reduced, and the miniaturization of the device is facilitated.
And an image-side Numerical Aperture (NA) of the first lens group 100img100An object numerical aperture NA of the second lens group 200obj200The following conditions are satisfied:
0<NAimg100，NAobj200<0.05 (relation 3).
After being imaged by the first lens group 100 and the second lens group 200, the object 500 to be photographed is finally imaged on a photosensitive surface of the detector 600. Further, when there is a wavelength selection requirement, a filter 400 is further included between the second lens group 200 and the photosensitive surface of the detector 600. Since the numerical aperture of the light beam in the space between the first lens group 100 and the second lens group 200 is small, the influence of manufacturing and assembling errors on the quality of the light beam is facilitated to be reduced, and therefore the design is beneficial to improving the yield in production. The second lens group 200 has at least one lens, and its image side surface is the aspheric surface, and this curved surface is close to optical axis department and is the concave surface, and its slope (the absolute value of the arctangent value of the contained angle of tangent and optical axis of the tangent line of the curve that this curved surface and meridian intersect and form) reduces after this curved surface keeps away from optical axis one section distance, and this design is favorable to restraining the aberration of off-axis visual field under the condition of big angle of view, especially restrains astigmatism and field curvature, in order to promote the utility model discloses imaging quality under the great condition of object space visual field.
The aperture 300 is a physical entity capable of defining a clear aperture. The outer side of the first lens group 100 is defined as the object space of the whole lens, and the outer side of the second lens group is defined as the image space of the whole lens. The aperture stop 300 is located between the first lens group 100 and the second lens group 200, and is advantageous for correcting distortion (aberration) and chromatic aberration (chromatic aberration) in imaging.
A distance sd in an optical axis direction from the aperture stop 300 to an edge of the first lens group 100100Satisfy the relation:
sd100<f100(relation 4);
a distance sd in an optical axis direction from the aperture stop 300 to an edge of the second lens group 200200Satisfy the relation:
sd200<f200(relational expression 5).
When the distances between the aperture stop 300 and the first lens group 100 and the second lens group 200 satisfy the relationships expressed by the relationships 4 and 5, the height of light rays (i.e., the distance from the intersection point of the light rays and the surface to the optical axis) of the light rays on the image side surface of the first lens group 100 and the object side surface of the second lens group 200 under the condition of large-field imaging is favorably reduced, so that the diameters of the first lens group 100 and the second lens group 200 are favorably reduced, the miniaturization is facilitated, and the processing cost (the processing cost of large-diameter lenses is high) is reduced; further, it is also convenient for the first lens on the image side of the first lens group 100 and the first lens on the object side of the second lens group 200 to perform correction of low-order spherical aberration, thereby improving the imaging quality. To sum up, the utility model has the advantages that: a lens with a sandwich structure composed of a first lens group 100, an aperture 300 and a second lens group 200 is provided, which can effectively reduce aberration, especially distortion and chromatic aberration, in short-distance imaging. The lens satisfying the structural characteristic and parameter relation can effectively reduce the diameter of the lens, the size of the lens, the processing difficulty and the processing cost, and the total optical cylinder length of a structure consisting of the lens and the detector.
In the present disclosure, the second lens group 200 includes at least three lenses in order from an object side to an image side along an optical axis; the first lens group 100 includes at least three lenses in order from an object side to an image side along an optical axis. The numbers of the first lens group 100 and the second lens group 200 can be freely combined, and different structural arrangements can also be freely combined; first lens group 100 and/or second lens group 200 have integral axial adjustment means; further, at least one lens in the first lens group 100 and/or the second lens group 200 has its own axial adjustment means.
The last two lenses of the second lens group 200, which are arranged in order from the object side to the image side along the optical axis, have the following four arrangement modes:
first and second lens groups: the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface; the object side surface and the image side surface of the last lens are both concave surfaces, and at least one of the object side surface and the image side surface of the last lens is an aspheric surface.
Second lens group: the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface; the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the smallest center thickness and the larger off-axis thickness.
Third second lens group: the object side surface of the penultimate lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface; the object side surface of the last lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface.
Fourth second lens group: the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface; the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the largest central thickness and the smaller off-axis thickness.
Among the various second lens groups: at least one of the object side surface and the image side surface of the last lens has an inflection point.
The first lens group 100 includes three following lens elements disposed in order from an object side to an image side along an optical axis:
first lens group: the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface; the second lens element has a convex image surface, and at least one of the object surface and the image surface is aspheric.
A second first lens group: the object side surface of the first lens is a concave surface, the image side surface is a convex surface, at least one surface of the object side surface and the image side surface is an aspheric surface, and the first lens is provided with a region with the largest central thickness and the smaller off-axis thickness; the second lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric.
Third first lens group: the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface; the object side surface of the second lens is a convex surface, and at least one of the object side surface and the image side surface of the second lens is an aspheric surface.
At least one of the object side surface and the image side surface of the first lens in each of the first lens groups has an inflection point.
All lenses have their applicable object distance range. The present invention works well in a situation where the object plane 500 is located at the object space focal plane of the first lens assembly 100 and the photo-sensitive surface of the detector 600 is located at the image space focal plane of the second lens assembly 200. When the second lens group 200 further includes the filter 400, the image-side focal surface of the second lens group 200 is an actual focal surface considering the refraction effect of the filter 400. In this case, the emergent light from an object point on the object plane 500 passing through the first lens assembly 100 is approximately collimated light, which is focused by the second lens assembly 200 to form an object point on the photosensitive surface of the detector 600. When the object plane 500 is not located at the ideal position, the focusing is further required, and the focusing can be performed by adjusting the distance between the whole of the first lens assembly 100 and the second lens assembly 200 of the present invention and the detector 600, or by adjusting one of the first lens assembly 100 or the second lens assembly 200 of the present invention.
Lens in the camera lens can be glass, plastics or other printing opacity materials. When a plastic material is used, weight and cost can be effectively reduced. The light transmitting surface of the lens may be aspherical to obtain more degrees of freedom for aberration correction, thereby better correcting aberrations. Just its image side surface of lens of second battery of lens group 200 at least exists is the aspheric surface, and its curve of crossing the section constitution of camera lens optical axis contains anti-curved point, has changed the concavity and convexity of curved surface promptly, and this design has the aberration that does benefit to and restraines the off-axis visual field under the condition of big angle of vision, with the promotion the utility model discloses imaging quality under the great condition of object space visual field.
Lens middle part is arranged in to light ring 300, so-called lens middle part indicates that the object space and the image space of light ring all contain lens. This aperture setting method is called mid-aperture. The arrangement of the diaphragm helps to increase the field angle and has good inhibition effect on distortion and chromatic aberration. Preferably, the miniature imaging lens for close-range imaging is a miniature imaging lens for portable electronic products.
Further, the camera lens contains mechanical housing as the encapsulation to constitute the formation of image module with motor, area array photoelectric detector (for example CMOS image sensor etc.) etc. and can be used to cell-phone, panel computer, wearable equipment (for example intelligent bracelet, intelligent wrist-watch etc.), small-size camera (for example motion camera etc.) etc. electronic product, realize closely the formation of image function, can realize micro-imaging function even.
Specific embodiments of the present invention are set forth below.
< first embodiment >
The first embodiment of the present invention is shown in fig. 2. The first lens group 100 includes 4 lenses, and the second lens group 200 includes 5 lenses. The 9 lenses are all aspheric lenses. The surface shape of the aspherical lens is expressed by the following curve equation (the aspherical surface is formed by revolving the curve around the optical axis):
wherein:
x: a point on the aspheric surface that is Y from the optical axis, a relative distance from the point to a tangent plane tangent to the focal point on the aspheric optical axis;
y: the perpendicular distance between a point on the aspheric curve and the optical axis;
r: a radius of curvature;
k: a cone coefficient;
Ai: the ith order aspheric coefficients.
The parameters of the lens surfaces in this embodiment are shown in fig. 8 and 9.
In fig. 8, the units of the length-type physical quantities such as the curvature radius r, the thickness t, and the like are all millimeters; the surfaces 1 to 18 are the surfaces from the object space to the image space, and the surfaces 19 to 20 are optical filters. A2 through a14 in table 2 are the aforementioned aspheric coefficients of order 2 through 14.
In the first lens element of the first lens assembly 100 of this embodiment, the object-side surface is aspheric, the curved surface is concave near the optical axis, and the curved surface has an inflection point after being away from the optical axis by a distance, and the image-side surface is aspheric and concave; the object side surface of the second lens is an aspheric surface, the position close to the optical axis is a convex surface, the image side surface is a concave surface, and the center of the second lens is thicker than the periphery of the second lens; the object space surface of the third lens is also a concave surface, but the sinking degree is weaker than that of the object space surface of the first lens, the image space surface is a concave surface, and the object space surface and the image space surface are both aspheric surfaces; the object side surface and the image side surface of the fourth lens are both aspheric convex surfaces.
The object side surface and the image side surface of the first lens of the second lens group 200 of the present embodiment are both aspheric convex surfaces; the object side surface and the image side surface of the second lens are both aspheric concave surfaces; the center of the object side surface of the third lens is a convex surface, then a concave surface appears at the off-axis position, the center of the image side surface is a concave surface, and then a convex surface appears at the off-axis position; the object side surface of the fourth lens is a relatively flat aspheric surface, and the image side surface of the fourth lens is a convex surface with an aspheric surface; the object side surface of the last lens is a concave surface with an aspheric surface, the image side surface of the last lens is an aspheric surface, the position of the curved surface, which is close to the optical axis, is a concave surface, and an inflection point exists after the curved surface is away from the optical axis for a distance.
The lens shown in the embodiment can obtain the object numerical aperture of more than 0.15 under the condition of the field angle of +/-30 degrees, and the Steckel ratio of most regions in the full field of view can be higher than 0.9, so that the imaging quality is better.
< second embodiment >
A second embodiment of the present invention is shown in fig. 3. The first lens group 100 includes 4 lenses, and the second lens group 200 includes 4 lenses. The parameters of each surface of the lens in this embodiment are shown in fig. 10 and 11, and the definitions of the variables are similar to those described above and are not repeated.
In the first lens element of the first lens assembly 100 of this embodiment, the object-side surface is aspheric, the curved surface is concave near the optical axis, and the curved surface has an inflection point after being away from the optical axis by a distance, and the image-side surface is aspheric and concave; the object side surface of the second lens is an aspheric surface, the position close to the optical axis is a convex surface, the image side surface is a concave surface, and the center of the second lens is thicker than the periphery of the second lens; the object space surface of the third lens is also a concave surface, but the sinking degree is weaker than that of the object space surface of the first lens, the image space surface is a concave surface, and the object space surface and the image space surface are both aspheric surfaces; the object side surface and the image side surface of the fourth lens are both aspheric convex surfaces.
The object side surface and the image side surface of the first lens of the second lens group 200 of the present embodiment are both aspheric convex surfaces; the object side surface and the image side surface of the second lens are both aspheric concave surfaces, wherein the concave degree of the object side surface is greater than that of the image side surface, and the image side surface is provided with an inflection point at an off-axis position; the center of the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface with an aspheric surface; the object side surface of the last lens is a convex surface with an aspheric surface, the image side surface of the last lens is a concave surface with an aspheric surface, and the center thickness of the last lens is smaller than that of the last lens at the off-axis position.
This embodiment has a smaller magnification ratio than the first embodiment, and is suitable for use in a case where a smaller magnification ratio is required.
< third embodiment >
In a third embodiment of the present invention, as shown in fig. 4, the first lens group 100 includes 3 lenses, and the second lens group 200 includes 4 lenses. The parameters of each surface of the lens in this embodiment are shown in fig. 12 and 13, and the definitions of the variables are similar to those described above and are not repeated.
In the first lens element of the first lens group 100 of this embodiment, the object-side surface is aspheric, the curved surface is concave at a position close to the optical axis, and the curved surface has an inflection point after being away from the optical axis by a distance, and the image-side surface is aspheric convex; the object side surface of the second lens is a convex surface with an aspheric surface, and the image side surface of the second lens is a concave surface with an aspheric surface; the object side surface and the image side surface of the third lens are both aspheric convex surfaces.
The object side surface and the image side surface of the first lens of the second lens group 200 of the present embodiment are both aspheric convex surfaces; the object side surface and the image side surface of the second lens are both aspheric concave surfaces; the center of the object side surface of the third lens is a convex surface, then a concave surface appears at the off-axis position, the center of the image side surface is a concave surface, and then a convex surface appears at the off-axis position; the object side surface of the fourth lens is a relatively flat aspheric surface, and the image side surface of the fourth lens is a convex surface with an aspheric surface; the object side surface of the last lens is a concave surface with an aspheric surface, the image side surface of the last lens is an aspheric surface, the position of the curved surface, which is close to the optical axis, is a concave surface, and an inflection point exists after the curved surface is away from the optical axis for a distance.
The present embodiment has a smaller number of lenses and can reduce the cost, but the wide angle performance is weaker than the previous embodiments.
< fourth embodiment >
In a fourth embodiment of the present invention, as shown in fig. 5, the first lens group 100 includes 5 lenses, and the second lens group 200 includes 6 lenses. The parameters of each surface of the lens in this embodiment are shown in fig. 14 and 15, and the definitions of the variables are similar to those described above and are not repeated.
In the first lens element of the first lens group 100 of this embodiment, the object-side surface is aspheric, the curved surface is concave at a position close to the optical axis, and after the curved surface is away from the optical axis by a certain distance, an inflection point exists, and the image-side surface is aspheric; the object side surface of the second lens is an aspheric surface, the position close to the optical axis is a convex surface, the image side surface is a relatively flat aspheric concave surface, and the center of the second lens is thicker than the periphery of the second lens; the object side surface of the third lens is also an aspheric concave surface, but the sinking degree is weaker than that of the object side surface of the first lens, and the image side surface is an aspheric convex surface; the object side surface and the image side surface of the fourth lens are both aspheric concave surfaces; the object side surface and the image side surface of the last lens are both aspheric convex surfaces.
The object side surface and the image side surface of the first lens of the second lens group 200 of the present embodiment are both aspheric convex surfaces; the object side surface of the second lens is a convex surface with an aspheric surface, and the image side surface of the second lens is a concave surface with an aspheric surface; the center of the object side surface of the third lens is a convex surface, then a concave surface appears at the off-axis position, the center of the image side surface is a concave surface, and then a convex surface appears at the off-axis position; the object side surface of the fourth lens is a relatively flat aspheric surface, and the image side surface of the fourth lens is a convex surface with an aspheric surface; the object side surface of the fifth lens is an aspheric concave surface, and the image side surface of the fifth lens is an aspheric convex surface; and the position of the object side surface, which is close to the optical axis, of the last lens is a concave surface, the image side surface is a relatively flat aspheric surface, and the center of the last lens is a slight convex surface.
The present embodiment employs a larger number of lenses to correct the aberration, and can obtain good wide-angle performance, especially distortion less than 0.7% in the ± 30 ° field angle (as shown in fig. 6), which is excellent for wide-angle imaging.
< fifth embodiment >
In a fifth embodiment of the present invention, as shown in fig. 7, the first lens group 100 includes 3 lenses, and the second lens group 200 includes 3 lenses. The parameters of each surface of the lens in this embodiment are shown in fig. 16 and 17, and the definitions of the variables are similar to those described above and are not repeated.
In the first lens element of the first lens group 100 of this embodiment, the object-side surface is aspheric, the curved surface is concave at a position close to the optical axis, and the curved surface has an inflection point after being away from the optical axis by a distance, and the image-side surface is aspheric convex; the object side surface of the second lens is a convex surface with an aspheric surface, and the image side surface of the second lens is a concave surface with an aspheric surface; the object side surface and the image side surface of the third lens are both aspheric convex surfaces.
In the second lens group 200 of this embodiment, both the object side surface and the image side surface of the first lens are aspheric convex surfaces, the object side surface of the second lens is aspheric concave surface, and the image side surface is aspheric convex surface; the center of the object side surface of the third lens is a convex surface with an aspheric surface, the center of the image side surface of the third lens is a concave surface with an aspheric surface, and the curved surface is away from the optical axis by a distance and then has an inflection point.
The number of the lenses is small, so that the cost is reduced conveniently, but the flat field performance is reduced to some extent.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (21)
1. The utility model provides a miniature imaging lens is used in short-range formation of image which characterized in that: in order from an object side to an image side along an optical axis: a first lens group (100), a diaphragm (300), a second lens group (200);
the first lens group (100) and the second lens group (200) are both positive focal power; the aperture of the first lens group (100) is larger than that of the first lens group, and the aperture of the second lens group (200) is smaller than that of the second lens group; a focal length f of the first lens group (100)100No more than 40mm, and the focal length f of the second lens group (200)200≤20mm；
In use, the distance od between the object (500) to be photographed and the object-side main surface of the first lens group (100)100Less than 2 times the focal length of the first lens group (100), i.e.
od100<2f100；
And the distance id from the image side main surface of the second lens group (200) to the image surface200Less than twice the focal length of the second lens group (200), i.e.
Id200<2f200；
And the image-side numerical aperture NA of the first lens group (100)img100An object numerical aperture NA of the second lens group (200)obj200The following conditions are satisfied:
0<NAimg100，NAobj200<0.05。
2. the miniature imaging lens for close-up imaging as set forth in claim 1, wherein:
a distance sd in an optical axis direction from the aperture stop (300) to an edge of the first lens group (100)100Satisfy the relation:
sd100<f100；
a distance sd in an optical axis direction from the aperture stop (300) to an edge of the second lens group (200)200Satisfy the relation:
sd200<f200。
3. the miniature imaging lens for close-up imaging as set forth in claim 1, wherein:
the second lens group (200) comprises at least three lenses in order from an object side to an image side along an optical axis.
4. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the last two lenses of the second lens group (200) arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface and the image side surface of the last lens are both concave surfaces, and at least one of the object side surface and the image side surface of the last lens is an aspheric surface.
5. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the last two lenses of the second lens group (200) arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the smallest center thickness and the larger off-axis thickness.
6. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the last two lenses of the second lens group (200) arranged in order from the object side to the image side along the optical axis are as follows:
the object side surface of the penultimate lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface;
the object side surface of the last lens is a concave surface, the image side surface is a convex surface, and at least one of the object side surface and the image side surface is an aspheric surface.
7. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the last two lenses of the second lens group (200) arranged in order from the object side to the image side along the optical axis are as follows:
the image side surface of the penultimate lens is a convex surface, and at least one surface of the object side surface and the image side surface of the penultimate lens is an aspheric surface;
the object side surface of the last lens is a convex surface, the image side surface of the last lens is a concave surface, at least one of the object side surface and the image side surface of the last lens is an aspheric surface, and the last lens is provided with a region with the largest central thickness and the smaller off-axis thickness.
8. The micro imaging lens for close-up imaging according to any one of claims 4 to 7, characterized in that:
at least one of the object side surface and the image side surface of the last lens has an inflection point.
9. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the second lens group (200) comprises, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
the object side surface and the image side surface of the second lens are both concave surfaces;
the center of the object side surface of the third lens is a convex surface, then the off-axis periphery is changed into a concave surface, the center of the image side surface is a concave surface, and then the off-axis periphery is changed into a convex surface;
the image side surface of the fourth lens is a convex surface, and at least one of the object side surface and the image side surface of the fourth lens is an aspheric surface;
the object side surface and the image side surface of the fifth lens are both concave surfaces, and at least one of the object side surface and the image side surface of the fifth lens is an aspheric surface.
10. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the second lens group (200) comprises, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
the object space surface and the image space surface of the second lens are both concave surfaces, wherein the concave degree of the object space surface is greater than that of the image space surface, and the image space surface is provided with an inflection point;
a third lens element having a convex image-side surface, and at least one of the object-side surface and the image-side surface being aspheric;
the fourth lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric and has a region with a smallest center thickness and a larger thickness on an off-axis.
11. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the second lens group (200) comprises, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
a second lens, the object side surface of which is convex and the image side surface of which is concave;
the center of the object side surface of the third lens is a convex surface, then the off-axis periphery is changed into a concave surface, the center of the image side surface is a concave surface, and then the off-axis periphery is changed into a convex surface;
a fourth lens, the object side surface of which is concave and the image side surface of which is convex;
a fifth lens element having a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric;
the sixth lens element has a concave object-side surface and a convex image-side surface, and at least one of the object-side surface and the image-side surface is aspheric.
12. The micro imaging lens for close-up imaging according to claim 3, characterized in that:
the second lens group (200) comprises, in order from an object side to an image side along an optical axis:
a first lens, the object side surface and the image side surface of which are convex surfaces;
a second lens element having a convex image-side surface and at least one of an object-side surface and the image-side surface being aspheric;
the third lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric and has a region with a maximum center thickness and a smaller thickness away from the axis.
13. The miniature imaging lens for close-up imaging as set forth in claim 1, wherein:
the first lens group (100) comprises at least three lenses in order from an object side to an image side along an optical axis.
14. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) is arranged along the object side to the image side of the optical axis as follows:
the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface;
the second lens element has a convex image surface, and at least one of the object surface and the image surface is aspheric.
15. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) is arranged along the object side to the image side of the optical axis as follows:
the object side surface of the first lens is a concave surface, the image side surface is a convex surface, at least one surface of the object side surface and the image side surface is an aspheric surface, and the first lens is provided with a region with the largest central thickness and the smaller off-axis thickness;
the second lens element has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface is aspheric.
16. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) is arranged along the object side to the image side of the optical axis as follows:
the object side surface and the image side surface of the first lens are both concave surfaces, and at least one surface of the object side surface and the image side surface of the first lens is an aspheric surface;
the object side surface of the second lens is a convex surface, and at least one of the object side surface and the image side surface of the second lens is an aspheric surface.
17. The micro imaging lens for close-up imaging according to any one of claims 14 to 16, characterized in that:
at least one of the object side surface and the image side surface of the first lens sheet is provided with an inflection point.
18. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) comprises, in order from an object side to an image side along an optical axis:
the first lens, its object space surface and image space surface are concave, and at least one surface in its object space surface and image space surface is the aspheric surface;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric, and has a region having a maximum center thickness and a smaller thickness on an off-axis;
the object side surface of the third lens is a concave surface, but the sinking degree of the third lens is less than that of the first lens, and the image side surface of the third lens is a concave surface;
and the object side surface and the image side surface of the fourth lens are convex surfaces.
19. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) comprises, in order from an object side to an image side along an optical axis:
a first lens element having a concave object-side surface and a convex image-side surface, at least one of the object-side surface and the image-side surface being aspheric, and having a region with a maximum center thickness and a smaller thickness on an off-axis;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric;
and the object side surface and the image side surface of the third lens are convex surfaces.
20. The miniature imaging lens for close-up imaging as set forth in claim 13, wherein:
the first lens group (100) comprises, in order from an object side to an image side along an optical axis:
the first lens, its object space surface and image space surface are concave, and at least one surface in its object space surface and image space surface is the aspheric surface;
a second lens element having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface is aspheric, and has a region having a maximum center thickness and a smaller thickness on an off-axis;
the object side surface of the third lens is a concave surface, but the sinking degree of the third lens is smaller than that of the first lens, and the image side surface of the third lens is a convex surface;
the object side surface and the image side surface of the fourth lens are both concave surfaces;
and the object side surface and the image side surface of the fifth lens are convex surfaces.
21. The miniature imaging lens for close-up imaging as set forth in claim 1, wherein:
the miniature imaging lens for close-range imaging is a miniature imaging lens for portable electronic products.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921131586.XU CN210427922U (en) | 2019-07-18 | 2019-07-18 | Miniature imaging lens for close-range imaging |
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| CN201921131586.XU CN210427922U (en) | 2019-07-18 | 2019-07-18 | Miniature imaging lens for close-range imaging |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376716A (en) * | 2019-07-18 | 2019-10-25 | 肯维捷斯（武汉）科技有限公司 | A kind of short distance imaging miniature imaging camera lens |
| CN110376716B (en) * | 2019-07-18 | 2024-06-21 | 小光子(武汉)科技有限公司 | Miniature imaging lens for close-range imaging |
-
2019
- 2019-07-18 CN CN201921131586.XU patent/CN210427922U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376716A (en) * | 2019-07-18 | 2019-10-25 | 肯维捷斯（武汉）科技有限公司 | A kind of short distance imaging miniature imaging camera lens |
| CN110376716B (en) * | 2019-07-18 | 2024-06-21 | 小光子(武汉)科技有限公司 | Miniature imaging lens for close-range imaging |
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Address after: Room 01, 21st Floor, Building 1, Huigu Space, No. 206 Laowuhuang Road, Guandong Street, Wuhan Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430070 Patentee after: Xiaophoton (Wuhan) Technology Co.,Ltd. Patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: CONVERGENCE TECHNOLOGY Co.,Ltd. Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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