CN221149035U - Large aperture near shooting lens - Google Patents
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- CN221149035U CN221149035U CN202323353823.6U CN202323353823U CN221149035U CN 221149035 U CN221149035 U CN 221149035U CN 202323353823 U CN202323353823 U CN 202323353823U CN 221149035 U CN221149035 U CN 221149035U
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Abstract
The utility model discloses a large aperture near-shooting lens, which comprises a first lens, a second lens, a third lens and a fourth lens which are coaxial and are sequentially arranged from the object side to the image side; the first lens is a positive lens with a convex surface facing the object; the second lens is a biconcave negative lens; the third lens is a concave-convex negative lens with the convex surface facing the image space; the fourth lens is a plano-convex positive lens with the convex surface facing the object space; the first lens satisfies 0.5< |f1/f| <0.7, where f1 is the focal length of the first lens and f is the effective focal length of the near-photographing lens. The large aperture near-shooting lens is combined by the arrangement of the four lenses, so that the first lens converges light beams, the second lens diverges light beams and the third lens focuses light beams, the technical effects of shortening the total optical length and improving the optical resolution are achieved, and the total length is prevented from being too long on the premise of achieving good refraction effect by adjusting the focal length of the first lens and the proportion of the whole effective focal length of the near-shooting lens, so that the lens meets the development trend of light and handiness.
Description
Technical Field
The utility model relates to the technical field of fixed focus lenses, in particular to a large aperture near-shooting lens.
Background
With the development of technology, the requirements of the modern society on optical lenses are increasing, and the requirements are increasing. Most of the near shooting lenses put forward in the market at present are used for large-size optical sensors, so that the size of the near shooting lenses belongs to large-size optical sensors, after the near shooting lenses are matched with miniature optical sensors, the whole sense is slightly heavy, the mechanism design of an optical module is limited, and the near shooting lenses do not meet the requirements of the current market on miniaturization and light weight of the lenses.
Disclosure of utility model
The technical problems to be solved by the utility model are as follows: a large aperture near-photographing lens with a small number of constituent lenses is provided.
In order to solve the technical problems, the utility model adopts the following technical scheme: the large aperture near shooting lens comprises a first lens, a second lens, a third lens and a fourth lens which are coaxial and are sequentially arranged from the object side to the image side; the first lens is a positive lens with a convex surface facing the object space; the second lens is a biconcave negative lens; the third lens is a concave-convex negative lens with the convex surface facing the image space; the fourth lens is a plano-convex positive lens with the convex surface facing the object space;
The first lens satisfies 0.5< |f 1/f| <0.7, where f 1 is a focal length of the first lens and f is an effective focal length of the near-photographing lens.
Further, the second lens satisfies 0.3< |f 2/f| <0.4, where f 2 is a focal length of the second lens.
Further, the lens system further comprises a diaphragm, wherein the diaphragm is positioned between the first lens and the second lens.
Further, the first lens also satisfies 0.5< |r 1/f1 | <0.8, where R 1 is the radius of curvature of the face of the first lens facing the object.
Further, the first lens also satisfies 0.3< |d 1/f1 | <0.4, where D 1 is the actual thickness of the first lens.
Further, the second lens also satisfies 1.5< (R 3+R4)/f2 | <1.6, where R 3 is the radius of curvature of the side of the second lens facing the object side and R 4 is the radius of curvature of the side of the second lens facing the image side.
Further, the second lens also satisfies 0.17< |d 2/f2 | <0.18, where D 2 is the actual thickness of the second lens.
Further, the third lens and the fourth lens also satisfy 1.8< (R 5+R6)/R7 | <1.9, where R 5 is a radius of curvature of a face of the third lens toward the object, R 6 is a radius of curvature of a face of the third lens toward the image, and R 7 is a radius of curvature of a face of the fourth lens toward the object.
Further, the third lens and the fourth lens also satisfy 0.7< |d 3/D4 | <0.75, where D 3 is the actual thickness of the third lens and D 4 is the actual thickness of the fourth lens.
Further, the third lens and the fourth lens also satisfy 2.1< |f 3/f4 | <2.2, where f 3 is the focal length of the third lens and f 4 is the focal length of the fourth lens.
The utility model has the beneficial effects that: this big light ring nearly claps camera lens simple structure is novel, through the range combination of four lenses, makes first lens convergence light beam, and second lens and third lens divergence light beam, and fourth lens focus light beam realizes shortening the optics overall length and promotes the technological effect of optical resolution power, and through the proportion of the whole effective focal length of the focal length of adjustment first lens and nearly claps the camera lens, under the prerequisite that reaches good refraction effect, has avoided overall length overlength, accords with the development trend that the camera lens is light and handy.
Drawings
Fig. 1 is a schematic structural diagram of a large aperture near-shooting lens according to a first embodiment of the present utility model;
FIG. 2 is a graph showing the MTF of all angles of view of a large aperture close-up lens according to an embodiment of the present utility model;
FIG. 3 is a graph showing curvature of field and distortion of a chief ray of a large aperture near-shooting lens according to an embodiment of the present utility model;
FIG. 4 is a vertical axis chromatic aberration diagram of a large aperture near-shooting lens according to an embodiment of the utility model;
FIG. 5 is a lateral chromatic aberration diagram of a large aperture near-shooting lens according to a first embodiment of the present utility model;
Fig. 6 is a schematic structural diagram of a large aperture near-shooting lens according to a second embodiment of the present utility model;
FIG. 7 is a graph showing the MTF of all angles of view of a large aperture close-up lens according to a second embodiment of the present utility model;
FIG. 8 is a graph showing curvature of field and distortion of a chief ray of a large aperture near-shooting lens according to a second embodiment of the present utility model;
FIG. 9 is a vertical axis chromatic aberration diagram of a large aperture near-shooting lens according to a second embodiment of the present utility model;
fig. 10 is a lateral chromatic aberration diagram of a large aperture near-shooting lens according to a second embodiment of the present utility model.
Description of the reference numerals:
1. A first lens;
2. A second lens;
3. a third lens;
4. a fourth lens;
5. a fifth plane lens;
6. A sixth planar lens;
7. A diaphragm.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 10, the large aperture near-shooting lens includes a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 coaxially arranged in order from an object side to an image side; the first lens 1 is a positive lens with a convex surface facing the object; the second lens 2 is a biconcave negative lens; the third lens 3 is a concave-convex negative lens with the convex surface facing the image space; the fourth lens 4 is a plano-convex positive lens with a convex surface facing the object space;
The first lens 1 satisfies 0.5< |f 1/f| <0.7, where f 1 is the focal length of the first lens 1 and f is the effective focal length of the near-photographing lens.
From the above description, the beneficial effects of the utility model are as follows: this big light ring nearly claps camera lens simple structure is novel, through the range combination of four lenses, makes first lens 1 convergence light beam, and second lens 2 and third lens 3 divergent light beam, and fourth lens 4 focused light beam realizes shortening optics total length and promotes the technological effect of optical resolution power, and through the proportion of the whole effective focal length of the focal length of adjustment first lens 1 and nearly claps the camera lens, under the prerequisite that reaches good refraction effect, has avoided total length overlength, accords with the development trend that the camera lens is light and handy.
Further, the second lens 2 satisfies 0.3< |f 2/f| <0.4, where f 2 is the focal length of the second lens 2.
As can be seen from the above description, by adjusting the ratio of the focal length of the second lens 2 and the overall effective focal length of the near-photographing lens, the overall length is prevented from being too long while providing a good refractive effect.
Further, a diaphragm 7 is included, and the diaphragm 7 is located between the first lens 1 and the second lens 2.
As can be seen from the above description, the diaphragm 76 is used to control the light flux through the lens.
Further, the first lens 1 also satisfies 0.5< |r 1/f1 | <0.8, where R 1 is the radius of curvature of the face of the first lens 1 facing the object.
As can be seen from the above description,
Further, the first lens 1 also satisfies 0.3< |d 1/f1 | <0.4, where D 1 is the actual thickness of the first lens 1.
As can be seen from the above description, the size of the first lens 1 is controlled by adjusting the ratio of the radius of curvature to the focal length of the first lens 1 and the ratio of the actual thickness to the focal length of the first lens 1, so as to avoid overlong total length of the near-photographing lens.
Further, the second lens 2 also satisfies 1.5< | (R 3+R4)/f2 | <1.6, where R 3 is the radius of curvature of the side of the second lens 2 facing the object side, and R 4 is the radius of curvature of the side of the second lens 2 facing the image side.
As can be seen from the above description, the ratio of the radius of curvature to the focal length of the second lens 2 is adjusted, so as to control the size of the second lens 2, and avoid the total length of the near-photographing lens from being too long.
Further, the second lens 2 also satisfies 0.17< |d 2/f2 | <0.18, where D 2 is the actual thickness of the second lens 2.
As can be seen from the above description, the ratio of the actual thickness to the focal length of the second lens 2 is adjusted, so as to control the size of the second lens 2, and avoid the total length of the near-photographing lens from being too long.
Further, the third lens 3 and the fourth lens 4 also satisfy 1.8< (R 5+R6)/R7 <1.9, where R 5 is a radius of curvature of a face of the third lens 3 facing the object, R 6 is a radius of curvature of a face of the third lens 3 facing the image, and R 7 is a radius of curvature of a face of the fourth lens 4 facing the object.
As can be seen from the above description, by adjusting the curvature radius ratio of the third lens 3 and the fourth lens 4, the dimensions of the third lens 3 and the fourth lens 4 are controlled, so that the total length of the near-photographing lens is prevented from being too long.
Further, the third lens 3 and the fourth lens 4 also meet 0.7< |d 3/D4 | <0.75, where D 3 is the actual thickness of the third lens 3 and D 4 is the actual thickness of the fourth lens 4.
As is apparent from the above description, the actual thickness ratio of the third lens 3 and the fourth lens 4 is controlled, so that the dimensions of the third lens 3 and the fourth lens 4 are controlled, and the total length of the near-photographing lens is prevented from being excessively long.
Further, the third lens 3 and the fourth lens 4 also satisfy 2.1< |f 3/f4 | <2.2, where f 3 is the focal length of the third lens 3 and f 4 is the focal length of the fourth lens 4.
As is apparent from the above description, by adjusting the focal length ratio of the third lens 3 and the fourth lens 4, the total length is prevented from being excessively long while providing good image quality.
Referring to fig. 1 to 5, a first embodiment of the present utility model is as follows: the large aperture near shooting lens comprises a first lens 1, a diaphragm 7, a second lens 2, a third lens 3 and a fourth lens 4 which are coaxial and are arranged in sequence from the object side to the image side; the first lens 1 is a plano-convex positive lens with a convex surface facing the object space; the second lens 2 is a biconcave negative lens; the third lens 3 is a concave-convex negative lens with the convex surface facing the image space; the fourth lens 4 is a plano-convex positive lens with its convex surface facing the object side.
Specifically, a fifth plane lens 5 is further disposed on a side of the fourth lens 4 close to the image space, and the fifth plane lens 5 is an optical filter. A sixth plane lens 6 is further arranged on one side, close to the image space, of the fifth plane lens 5, and the sixth plane lens 6 is a protective glass sheet of the micro optical sensor. In this embodiment, the first lens 1 and the second lens 2 are both high refractive index lenses. The refractive index of the material of the first lens 1 is 1.77, and the abbe number of the material of the first lens 1 is 49.62. The refractive index of the material of the second lens 2 is 1.73, and the abbe number of the material of the second lens 2 is 28.32. The materials of the third lens 3 and the fourth lens 4 are the same, the refractive indexes of the materials of the third lens 3 and the fourth lens 4 are 1.64, and the abbe numbers of the materials of the third lens 3 and the fourth lens 4 are 55.45. The fifth plane lens 5 and the sixth lens are made of the same material, the refractive indexes of the materials of the fifth plane lens 5 and the sixth lens are 1.52, and the abbe numbers of the materials of the fifth plane lens 5 and the sixth lens are 64.17.
Preferably, the first lens 1 satisfies 0.5< |f 1/f| <0.7, where f 1 is the focal length of the first lens 1 and f is the effective focal length of the near-photographing lens. In the present embodiment, the effective focal length f=14 mm of the close-up lens, and the focal length f 1＝8.4mm,∣f1/f|=0.6 of the first lens 1.
Preferably, the first lens 1 also satisfies 0.5< |r 1/f1 | <0.8, where R 1 is the radius of curvature of the face of the first lens 1 facing the object. In the present embodiment, the radius of curvature R 1＝6.52,∣R1/f1 |= 0.7762 of the surface of the first lens 1 facing the object side.
Preferably, the first lens 1 also satisfies 0.3< |d 1/f1 | <0.4, where D 1 is the actual thickness of the first lens 1. In the present embodiment, the actual thickness D 1＝2.931mm,∣D1/f1 |= 0.3489 of the first lens 1.
Preferably, the second lens 2 satisfies 0.3< |f 2/f| <0.4, where f 2 is the focal length of the second lens 2. In this embodiment, the focal length f 2＝-5.18mm,∣f2/f|=0.37 of the second lens 2.
Preferably, the second lens 2 also satisfies 1.5< (R 3+R4)/f2 | <1.6, where R 3 is the radius of curvature of the side of the second lens 2 facing the object, and R 4 is the radius of curvature of the side of the second lens 2 facing the image.
Preferably, the second lens 2 also satisfies 0.17< |d 2/f2 | <0.18, where D 2 is the actual thickness of the second lens 2. In the present embodiment, the actual thickness D 2＝0.898mm,∣D2/f2 |= 0.1734 of the second lens 2.
Preferably, the third lens 3 and the fourth lens 4 also satisfy 1.8< (R 5+R6)/R7 | <1.9, where R 5 is a radius of curvature of a face of the third lens 3 facing the object side, R 6 is a radius of curvature of a face of the third lens 3 facing the image side, and R 7 is a radius of curvature of a face of the fourth lens 4 facing the object side.
Preferably, the third lens 3 and the fourth lens 4 also meet 0.7< |d 3/D4 | <0.75, where D 3 is the actual thickness of the third lens 3 and D 4 is the actual thickness of the fourth lens 4. In the present embodiment, the actual thickness D 3 of the third lens 3 is 1.499mm, and the actual thickness D 4＝2.115mm,∣D3/D4 |= 0.7087 of the fourth lens 4.
Preferably, the third lens 3 and the fourth lens 4 also satisfy 2.1< |f 3/f4 | <2.2, where f 3 is the focal length of the third lens 3 and f 4 is the focal length of the fourth lens 4. In the present embodiment, the focal length f 3 = 28.388mm of the third lens 3 and the focal length f 4＝13.078mm,∣f3/f4|= 2.1707 of the fourth lens 4.
The main parameters of the large aperture near-photographing lens of the first embodiment are shown in table 1 below.
TABLE 1
The parameters related to the close-up function of the large aperture close-up lens of the first embodiment are shown in table 2 below.
TABLE 2
| Project | Example 1 |
| Object distance 0.05M center MTF | 0.7100 |
| Aperture value of 0.05M for object distance | 2.2 |
| Object distance 0.05M lateral magnification | -0.345X |
| Optical distortion | -0.496％ |
| Maximum angular relative brightness | 99.71％ |
| Angle of primary incidence | 6.87 Degree |
Fig. 2 is an MTF graph of all angles of view of a long and medium focal length optical lens according to a first embodiment of the present utility model, in which the horizontal axis represents spatial frequency, unit: wire pairs per millimeter (lp/mm); the vertical axis represents the value of the Modulation Transfer Function (MTF), the value of the MTF is used for evaluating the imaging quality of the lens, the range of the MTF is 0-1, and the higher and straighter the MTF curve is, the better the imaging quality of the lens is, and the stronger the reduction capability on a real image is.
FIG. 3 is a graph showing the curvature of field and distortion of the principal ray of a large aperture close-up lens according to the first embodiment of the present utility model, wherein the smaller the curvature of field is, the straighter the curvature of field is, the better the curvature of field, the more consistent the imaging quality on the imaging surface is, and no blurring phenomenon occurs at a certain point or position; the smaller the distortion is, the better the distortion is, and the bending phenomenon can not occur in a straight line in the imaging process; the field curvature and distortion cannot be zero in the actual production and manufacturing process, and the smaller the field curvature and distortion, the better the field curvature and distortion. As can be seen from fig. 2, in the large aperture near-shooting lens of the first embodiment, the field curvature is smaller than 0.14mm, the optical distortion is smaller than 5%, the magnification of the whole image surface of the large aperture near-shooting lens is uniform, the picture proportion matches the real scene, and the large aperture near-shooting lens has good optical performance.
In order to improve the chromatic aberration, the first lens 1 and the second lens 2 are high refractive index lenses, and the third lens 3 and the fourth lens 4 are made of the same material. Fig. 4 is a vertical axis color difference chart of a large aperture near-photographing lens according to the first embodiment of the utility model, and the horizontal axis is the numerical value, and the unit is micrometers. As can be seen from fig. 4, the vertical chromatic aberration of the large-aperture near-shooting lens of the first embodiment is small Yu Aili-diameter, and is controlled within 1.25 micrometers, so that the chromatic aberration of the large-aperture near-shooting lens is well corrected.
Fig. 5 is a lateral color difference diagram of a large aperture near-photographing lens according to a first embodiment of the present utility model, and in fig. 5, the abscissa indicates the magnitude of the numerical value, and the unit is millimeters. And drawing the color difference value of each view field among the blue light, the red light and the green light, wherein the smaller the interval value on the abscissa is, the closer the three curves respectively representing the blue light, the red light and the green light are, and the smaller the color difference value of the light with three wavelengths passing through the large aperture close-up lens is.
Referring to fig. 6 to 10, a second embodiment of the present utility model is as follows: the large-aperture near-shooting lens comprises a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4 which are coaxial and are arranged in sequence from the object side to the image side; the first lens 1 is a biconvex positive lens with a convex surface facing the object; the second lens 2 is a biconcave negative lens; the third lens 3 is a concave-convex negative lens with the convex surface facing the image space; the fourth lens 4 is a plano-convex positive lens with its convex surface facing the object side.
Specifically, a fifth plane lens 5 is further disposed on a side of the fourth lens 4 close to the image space, and the fifth plane lens 5 is an optical filter. A sixth plane lens 6 is further arranged on one side, close to the image space, of the fifth plane lens 5, and the sixth plane lens 6 is a protective glass sheet of the micro optical sensor. In this embodiment, the first lens 1 and the second lens 2 are both high refractive index lenses. The refractive index of the material of the first lens 1 is 1.77, and the abbe number of the material of the first lens 1 is 46.24. The refractive index of the material of the second lens 2 is 1.73, and the abbe number of the material of the second lens 2 is 28.32. The materials of the third lens 3 and the fourth lens 4 are the same, the refractive indexes of the materials of the third lens 3 and the fourth lens 4 are 1.64, and the abbe numbers of the materials of the third lens 3 and the fourth lens 4 are 55.45. The fifth plane lens 5 and the sixth lens are made of the same material, the refractive indexes of the materials of the fifth plane lens 5 and the sixth lens are 1.52, and the abbe numbers of the materials of the fifth plane lens 5 and the sixth lens are 64.17.
Preferably, the first lens 1 satisfies 0.5< |f 1/f| <0.7, where f 1 is the focal length of the first lens 1 and f is the effective focal length of the near-photographing lens. In the present embodiment, the effective focal length f=10mm of the close-up lens, and the focal length f 1＝6.078mm,∣f1/f|= 0.6078 of the first lens 1.
In the present embodiment, the radius of curvature R 1＝5.774,∣R1/f1 |=0.95 of the surface of the first lens 1 facing the object side.
In the present embodiment, the actual thickness D 1＝1.7mm,∣D1/f1 |= 0.2797 of the first lens 1.
In the present embodiment, the focal length f 2＝-4.272mm,∣f2/f|= 0.4272 of the second lens 2.
In the present embodiment, the radius of curvature R 3 = -6.399 of the surface of the second lens 2 facing the object side, and the radius of curvature R 4＝6.399,∣(R3+R4)/f2 |=0 of the surface of the second lens 2 facing the image side.
In the present embodiment, the actual thickness D 2＝0.6,∣D2/f2 |= 0.1405 of the second lens 2
In the present embodiment, the radius of curvature R 5 = -18.353 of the surface of the third lens 3 facing the object side, the radius of curvature R 6 = -5.215 of the surface of the third lens 3 facing the image side, and the radius of curvature R 7＝13.614,∣(R5+R6)/R7 |= 1.7312 of the surface of the fourth lens 4 facing the object side.
In the present embodiment, the actual thickness D 3 of the third lens 3 is 2mm, and the actual thickness D 4＝3mm,∣D3/D4 |=0.6667 of the fourth lens 4.
In the present embodiment, the focal length f 3 = 10.723mm of the third lens 3 and the focal length f 4＝21.229mm,∣f3/f4 |=0.5051 of the fourth lens 4.
The main parameters of the large aperture near-photographing lens of the second embodiment are shown in the following table 3.
TABLE 3 Table 3
The parameters related to the close-up function of the large aperture close-up lens of the second embodiment are shown in table 4 below.
TABLE 4 Table 4
| Project | Example two |
| Object distance 0.05M center MTF | 0.5211 |
| Aperture value of 0.05M for object distance | 2.2 |
| Object distance 0.05M lateral magnification | -0.234X |
| Optical distortion | -0.072％ |
| Maximum angular relative brightness | 82.32％ |
| Angle of primary incidence | 9.11 Degree |
Fig. 7 is an MTF graph of all angles of view of a long and medium focal length optical lens according to the first embodiment of the present utility model, wherein the horizontal axis represents spatial frequency, unit: wire pairs per millimeter (lp/mm); the vertical axis represents the value of the Modulation Transfer Function (MTF), the value of the MTF is used for evaluating the imaging quality of the lens, the range of the MTF is 0-1, and the higher and straighter the MTF curve is, the better the imaging quality of the lens is, and the stronger the reduction capability on a real image is.
FIG. 8 is a graph showing the curvature of field and distortion of the principal ray of a large aperture close-up lens according to the second embodiment of the present utility model, wherein the smaller the curvature of field is, the straighter the curvature of field is, the better the curvature of field, the more consistent the imaging quality on the imaging surface is, and no blurring phenomenon occurs at a certain point or position; the smaller the distortion is, the better the distortion is, and the bending phenomenon can not occur in a straight line in the imaging process; the field curvature and distortion cannot be zero in the actual production and manufacturing process, and the smaller the field curvature and distortion, the better the field curvature and distortion. As can be seen from fig. 2, in the large aperture near-shooting lens of the second embodiment, the field curvature is smaller than 0.1mm, the optical distortion is smaller than 0.08%, the magnification of the whole image surface of the large aperture near-shooting lens is uniform, the picture proportion matches the real scene, and the large aperture near-shooting lens has good optical performance.
Fig. 9 is a vertical axis chromatic aberration diagram of a large aperture near-shooting lens according to a second embodiment of the present utility model. The abscissa is the magnitude of the value in microns. The vertical axis chromatic aberration of the large aperture near-shooting lens of the second embodiment is controlled within 2.5 micrometers, and the chromatic aberration control is excellent.
Fig. 10 is a lateral color difference diagram of a large aperture near-photographing lens according to a first embodiment of the present utility model, wherein in fig. 10, the abscissa indicates the magnitude of the numerical value, and the unit is millimeters. And drawing the color difference value of each view field among the blue light, the red light and the green light, wherein the smaller the interval value on the abscissa is, the closer the three curves respectively representing the blue light, the red light and the green light are, and the smaller the color difference value of the light with three wavelengths passing through the large aperture close-up lens is.
In summary, the large aperture near-shooting lens provided by the utility model has a simple and novel structure, the first lens converges the light beam, the second lens diverges the light beam from the third lens, the fourth lens focuses the light beam, the technical effects of shortening the total optical length and improving the optical resolution are achieved, and the total length is prevented from being too long on the premise of achieving good refraction effect by adjusting the focal length of the first lens and the proportion of the total effective focal length of the near-shooting lens, so that the lens meets the development trend of light and handy.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. Big light ring closely claps camera lens, its characterized in that: the lens comprises a first lens, a second lens, a third lens and a fourth lens which are coaxial and are arranged in sequence from the object side to the image side; the first lens is a positive lens with a convex surface facing the object space; the second lens is a biconcave negative lens; the third lens is a concave-convex negative lens with the convex surface facing the image space; the fourth lens is a plano-convex positive lens with the convex surface facing the object space;
The first lens satisfies 0.5< |f 1/f| <0.7, where f 1 is a focal length of the first lens and f is an effective focal length of the near-photographing lens.
2. The large aperture near-shooting lens of claim 1, wherein: the second lens satisfies 0.3< |f 2/f| <0.4, where f 2 is the focal length of the second lens.
3. The large aperture near-shooting lens of claim 1, wherein: the lens assembly further comprises a diaphragm, wherein the diaphragm is positioned between the first lens and the second lens.
4. The large aperture near-shooting lens of claim 1, wherein: the first lens also satisfies 0.5< |r 1/f1 | <0.8, where R 1 is the radius of curvature of the face of the first lens facing the object.
5. The large aperture near-shooting lens of claim 1, wherein: the first lens also satisfies 0.3< |d 1/f1 | <0.4, where D 1 is the actual thickness of the first lens.
6. The large aperture near-shooting lens of claim 1, wherein: the second lens also satisfies 1.5< | (R 3+R4)/f2 | <1.6, where R 3 is the radius of curvature of the side of the second lens facing the object, and R 4 is the radius of curvature of the side of the second lens facing the image.
7. The large aperture near-shooting lens of claim 1, wherein: the second lens also satisfies 0.17< |d 2/f2 | <0.18, where D 2 is the actual thickness of the second lens.
8. The large aperture near-shooting lens of claim 1, wherein: the third lens and the fourth lens also satisfy 1.8< | (R 5+R6)/R7 | <1.9, where R 5 is the radius of curvature of the face of the third lens facing the object, R 6 is the radius of curvature of the face of the third lens facing the image, and R 7 is the radius of curvature of the face of the fourth lens facing the object).
9. The large aperture near-shooting lens of claim 1, wherein: the third lens and the fourth lens also satisfy 0.7< |d 3/D4 | <0.75, where D 3 is the actual thickness of the third lens and D 4 is the actual thickness of the fourth lens.
10. The large aperture near-shooting lens of claim 1, wherein: the third lens and the fourth lens also satisfy 2.1< |f 3/f4 | <2.2, where f 3 is the focal length of the third lens and f 4 is the focal length of the fourth lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323353823.6U CN221149035U (en) | 2023-12-08 | 2023-12-08 | Large aperture near shooting lens |
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| CN202323353823.6U CN221149035U (en) | 2023-12-08 | 2023-12-08 | Large aperture near shooting lens |
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