37results about How to "Reduce Tolerance Sensitivity" patented technology

The invention provides an optical lens, and the optical lens comprises a first lens with negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power; the sixth lens has focal power; a seventh lens with focal power; wherein one of the fifth lens and the sixth lens has positive focal power, the other one of the fifth lens and the sixth lens has negative focal power, and the fifth lens and the sixth lens are glued to form a glued lens. The problem that high resolution, miniaturization, small distortion, low cost and good temperature performance of an optical lens in the prior art are difficult to consider at the same time is solved.

The utility model relates to a low total length 8M foresight optical lens, which is characterized in that an optical system of the lens is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path. The lenses are made of plastic and glass materials, the first lens, the second lens, the fourth lens, the fifth lens and the sixth lens are glass spherical lenses, the third lens and the seventh lens are plastic aspheric lenses, and the fifth lens and the sixth lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the distance between the lenses on the optical axis and the like, the total length of the lens and the radial size of each lens are reduced while the requirements of a front-view wide-angle camera and a front-view narrow-angle camera are replaced by the low-total-length 8M ultra-wide-angle imaging performance of the lens; and the lens group is miniaturized.

The invention discloses a miniature lens with a large target surface and a large aperture. Comprising a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power which are sequentially arranged from an object side to an image side, the large-target-surface large-aperture miniature lens comprises a second lens with positive focal power, a third lens with negative focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, and further comprises an aperture diaphragm which is located between the second lens and the third lens or located between the third lens and the fourth lens. And by reasonably setting the proportional relation of key parameters, the total optical length is within 30mm under the condition of ensuring a large aperture of at least F1.05 and a large target surface of IH6.5 mm, and the effect of a miniature lens is obtained.

The utility model relates to a foresight ultra-wide-angle binocular camera. An optical system of the camera is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. Under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave positive lens, the third lens is a meniscus convex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a meniscus concave negative lens, the sixth lens is a meniscus convex positive lens, and all the lenses are made of glass materials. Wherein the first lens and the sixth lens are glass aspheric lenses, and the fourth lens and the fifth lens form a balsaming lens group. While the wide-angle 120-degree clear imaging is realized, the wide-angle 120-degree wide-angle imaging lens has a relatively small appearance size and relatively high environmental stability.

The utility model relates to an ultra-wide-angle lens suitable for a front binocular camera module. An optical system is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along the incident direction of light, and the fourth lens and the fifth lens are glued to form a glued lens group. The imaging angle of the camera lens to an object is larger than 120 degrees, meanwhile, the camera lens has the advantages of being high in imaging definition, large in clear aperture, low in tolerance sensitivity, good in high-temperature and low-temperature stability and the like, meanwhile, scenes in front of a vehicle can be monitored more comprehensively, and through reasonable matching of all the optical lenses, the system is compact and reasonable in structure, and the system is convenient to use. The imaging system is simple in structure, low in cost, easy to assemble, low in tolerance sensitivity and more suitable for large-scale high-yield production, the overall size is reduced, axial chromatic aberration, vertical-axis chromatic aberration and high-order chromatic aberration are corrected, and it is guaranteed that the imaging system can have high imaging quality even at a large angle.

The utility model relates to a high-brightness low-cost DMD welcome lamp lens. An optical system of the lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens and a fifth lens which are sequentially arranged from left to right along a light incident light path. The lenses are made of plastic and glass materials, the first lens, the second lens, the third lens and the fourth lens are plastic aspheric lenses, and the fifth lens is a glass spherical lens. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the imaging performance requirement of the lens is met, the total length of the lens and the radial size of each lens are reduced, and the miniaturization of the lens group is realized.

The utility model relates to a welcome lamp lens suitable for a DMD imaging system, an optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a meniscus concave negative lens, and the fourth lens is a meniscus concave negative lens. The fourth lens is a biconvex positive lens, the fifth lens is a meniscus positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, the eighth lens is a biconvex positive lens, the third lens and the fourth lens form a balsaming lens group, and the sixth lens and the seventh lens form a balsaming lens group. The first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens is a glass aspheric lens. According to the utility model, the imaging angle of the lens to an object is greater than 110 degrees, and TV Distortion can be ensured while a picture with the width of 45 cm can be projected at a position of 25 cm; 1%.

The utility model relates to a six-piece type side rear-view camera. An optical system of the camera is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. Under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a meniscus concave negative lens, the fifth lens is a biconvex positive lens, the sixth lens is a plano-concave negative lens, and all the lenses are made of glass materials. Wherein the first lens is a glass aspheric lens, and the third lens and the fourth lens form a balsaming lens group. While 3M clear imaging is realized, the number of sheets is relatively small and the appearance size is relatively small.

The utility model relates to a DMD welcome lamp lens with short total length, the lens is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens from left to right along a light incident light path, the lenses are made of glass materials, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are glass spherical lenses, the second lens is a glass aspheric lens, wherein the third lens and the fourth lens, and the fifth lens and the sixth lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the imaging performance requirement of the lens is met, the total length of the lens and the radial size of each lens are reduced, and a 33 mm lens group is formed.

The utility model relates to a large-aperture six-piece type side rear-view camera, and the optical system of the camera comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are provided with focal power along an incident light path, and a diaphragm is arranged between the second lens and the third lens. Wherein the third lens and the fourth lens are closely connected to form a balsaming lens group; the first lens is a biconcave negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, the fifth lens is a biconvex positive lens, and the sixth lens is a meniscus concave negative lens. The first lens, the second lens, the third lens and the fourth lens are glass spherical lenses, and the fifth lens and the sixth lens are glass aspheric lenses. The imaging angle of an object is larger than 80 degrees, and meanwhile, the camera has the advantages that the imaging definition is 3M, the F number is 1.4, the tolerance sensitivity is low, the high-low temperature stability is good and the like, and scenes behind the side of a vehicle and far away from the vehicle can be monitored more comprehensively.

The utility model relates to an ultra-wide-angle high-definition surround-view camera lens, an optical system of the camera lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path, and the fourth lens and the fifth lens form a cemented lens group; under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens is a meniscus concave negative lens, the object side surface is a convex surface, and the image side surface is a concave surface; the third lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface; the fourth lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface; the fifth lens is a biconcave negative lens, the object side surface is a concave surface, and the image side surface is a concave surface; the sixth lens is a biconvex positive lens, the object side surface is a convex surface, and the image side surface is a convex surface. The lens is helpful for realizing small-size high-resolution imaging and ultra-wide-angle camera shooting, and the cost is reduced.

The utility model relates to a foresight ultra-wide-angle binocular shooting optical system. The optical system of a lens is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. Under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a meniscus concave negative lens, the second lens is a meniscus convex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconvex positive lens, the sixth lens is a meniscus concave negative lens, and all the lenses are made of glass materials. Wherein the first lens and the second lens are glass aspheric lenses, and the fifth lens and the sixth lens form a balsaming lens group. While the wide-angle 120-degree clear imaging is realized, the wide-angle 120-degree wide-angle imaging lens has a relatively small appearance size and relatively high environmental stability.

The utility model relates to a low total length 8M foresight main camera. An optical system of the main camera is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path. The lenses are made of plastic and glass materials, the first lens, the second lens, the fourth lens, the sixth lens and the seventh lens are glass spherical lenses, the third lens and the fifth lens are plastic aspheric lenses, and the sixth lens and the seventh lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the total length of the lens and the radial size of each lens are reduced while the requirements of a front-view wide-angle camera and a front-view narrow-angle camera are replaced by the low-total-length 8M ultra-wide-angle imaging performance of the lens, and the miniaturization of the lens group is realized.

The invention discloses an optical lens and electronic equipment comprising the same. The optical lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens, the second lens has negative focal power; the third lens has positive focal power; a fourth lens; a fifth lens, wherein the fifth lens has positive focal power; a sixth lens, wherein the sixth lens has negative focal power; a seventh lens, wherein the seventh lens has positive focal power; the curvature radius R3 of the object side face of the second lens and the curvature radius R4 of the image side face of the second lens meet the condition that R3 / R4 is larger than or equal to 0.512 and smaller than or equal to 0.7735. The curvature radius R13 of the object side face of the seventh lens and the curvature radius R14 of the image side face of the seventh lens meet the condition that R13 / R14 is larger than or equal to 0.4207 and smaller than or equal to 5.7963. The radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy 0.02 < = (R3-R4) / (R3 + R4) < = 0.4. The optical lens can realize at least one of the beneficial effects of high resolution, low cost, miniaturization, small aperture, small CRA, good temperature performance and the like.

The invention discloses a close-range identification lens, which is composed of an aperture (STO), a first lens (E1), a second lens (E2), a third lens (E3), a fourth lens (E4), and a chip protection glass (E5) in order from an object plane to an image plane; the first lens (E1) is a positive lens, the object side surface is a convex surface, the image side surface is a convex surface, and both are aspherical surfaces; the second lens (E2) is a negative lens, the object side surface is a concave surface, the image side surface is a concave surface, and both are aspherical surfaces; the third lens (E3) is a positive lens, the object side surface is a concave surface, the image side surface is a convex surface, and both are aspherical surfaces; the fourth lens (E4) is a negative lens, the object side surface is a convex surface, the image side surface is a concave surface, and both are aspherical surfaces; the four lenses are all made of plastic material, with a simple structure, low tolerance sensitivity, and are conducive to mass production; the positive lens and the negative lens are combined with each other, which is conducive to correcting astigmatism and distortion, and at the same time is conducive to reducing the total length of the optical system.

The present invention discloses a telephoto lens and a telephoto system including the telephoto lens, wherein the telephoto lens adopts a method of forming two groups of double-cemented lenses with four spherical lenses, and satisfies the following relationship: 1<f / TTL, 2<|f 34 / f 12 | Among them, f, f 12 、f 34 They are the focal lengths of the entire telephoto lens, the first double-cemented lens, and the second double-cemented lens, respectively. TTL is the distance from the first surface of the lens object side to the image plane. The overall focal length is greater than the mechanical tube length, which is beneficial to ensure the telephoto characteristics of the lens without causing the tube length to be too long, making the overall structure compact. While ensuring high imaging quality, the number of lens assemblies is reduced, making installation easier; on the other hand, the relative position deviation between the two double-cemented lenses has little effect on imaging, reducing the tolerance sensitivity of the lens.

The embodiment of the invention relates to the technical field of optical imaging, and provides an optical lens, a camera module and a microscope, and the optical lens comprises twelve lenses which are arranged from an image side to an object side. In the direction from the image side to the object side, the lens located at the first position and the lens located at the second position form a first glued lens, and the focal power of the first glued lens is negative; the focal length EFL of the optical lens meets the relational expression: 3.5 < = EFL < = 6.5; the entrance pupil diameter ENTD of the optical lens satisfies the relational expression: 6.6 < = ENTD < = 9.5. The optical lens achieves the purposes of large numerical aperture, long working distance and high resolution.

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; a third lens with positive optical power; a fourth lens; a fifth lens with positive optical power; and a sixth lens with negative optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<1.35; the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f1 of the first lens satisfy: 0.9<(f3+f5) / f1<1.7.

The invention discloses a far infrared optical system and a far infrared optical lens. The far infrared optical system sequentially comprises a first refraction lens, a second refraction lens and a third refraction lens from an object side to an image side along an optical axis, the focal power of the first refractor is negative, and the object side surface and the image side surface of the first refractor both protrude towards the object side; the focal power of the second refractor is positive, and the object side surface and the image side surface of the second refractor both protrude towards the image side; the focal power of the third refraction lens is positive, and the object side surface of the third refraction lens protrudes towards the object side; the far infrared optical system further comprises a first diffractive optical element and / or a second diffractive optical element arranged in a light path. The far-infrared optical system provided by the invention is small in size, the tolerance sensitivity of the far-infrared optical system is reduced by reasonably distributing the focal length of each lens, and the installation difficulty of the far-infrared optical system can be reduced.

The application discloses a high-resolution optical system for cosmetic removal and color cosmetic detection, comprising seven aspheric lenses, which are a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane. The application combines positive and negative lenses, reasonably allocates the refractive power of each lens, and makes light transition gently, so that the tolerance sensitivity of the system is significantly reduced, chromatic aberration, spherical aberration, field curvature and distortion are effectively corrected, the resolution and relative luminance are improved, the high-resolution optical system for cosmetic removal and color cosmetic detection has sufficient light flux, high resolution, and unobvious field curvature and distortion, and all the lenses are made of plastic, so that the cost is low and mass production is easy.

An optical lens, a camera module and a terminal device are provided, the optical lens has seven lenses with refractive power, the optical lens sequentially comprises a first lens to a seventh lens from an object side to an image side along an optical axis, the refractive power of the first lens is negative, negative, positive, positive, positive, negative and positive, and the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface near the optical axis; the object-side surface and the image-side surface of the second lens element are respectively a concave surface and a convex surface near the optical axis; the object-side surface and the image-side surface of the third lens element are respectively a convex surface and a concave surface near the optical axis; the fourth lens element has an object-side surface and an image-side surface being convex in a paraxial region. The fifth lens element has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element has an object-side surface and an image-side surface being concave in a paraxial region. The seventh lens element has a convex object-side surface and a concave image-side surface in paraxial regions, respectively. The optical lens satisfies the following relational expressions: FOV is greater than or equal to 140 degrees and less than or equal to 150 degrees, 7.2 lt; tTL / Flt; and 7.6. The optical lens provided by the invention can realize miniaturization, has the characteristic of a large field angle, and improves the imaging quality of the optical lens.

The present invention discloses an optical lens, an imaging module and an electronic device. The optical lens sequentially includes, along the optical axis from the object side to the image side: a first lens with positive refractive power, the object side surface and the image side surface are convex and concave respectively near the optical axis; a second lens with negative refractive power, the object side surface and the image side surface are convex and concave respectively near the optical axis; a third lens with positive refractive power, the object side surface is convex near the optical axis; a fourth lens with refractive power; a fifth lens with refractive power, the object side surface and the image side surface are convex and concave respectively near the optical axis; a sixth lens with positive refractive power, the object side surface and the image side surface are convex and concave respectively near the optical axis; a seventh lens with negative refractive power, the object side surface and the image side surface are convex and concave respectively near the optical axis; the optical lens satisfies: 1.85 < FNOmax / FNOmin < 2.1. Thus, it can not only meet the miniaturization requirement, but also has the characteristic of variable aperture.

The present invention relates to a zoom lens with a constant large aperture, comprising: a first lens group with positive focal power, a second lens group with negative focal power, an aperture, a third lens group with positive focal power, and a fourth lens group with positive focal power, which are arranged in sequence from the object side to the image side; the first lens group and the third lens group are fixed groups, the second lens group moves along the optical axis from the object side to the image side to perform a zoom from a wide-angle end to a telephoto end, and the fourth lens group moves along the optical axis to correct the image plane position during the zoom process; the first lens group and the second lens group satisfy: 2.0≤(d 12t ‑d 12w ) / fw≤4.0, where d 12t is the distance from the image side of the last lens of the first lens group to the object side of the first lens of the second lens group when the zoom lens is at the telephoto end; d 12w f is the distance from the image side of the last lens of the first lens group to the object side of the first lens of the second lens group when the zoom lens is at the wide-angle end; W This is the focal length at the wide-angle end.

The present application belongs to the technical field of barrier segmentation, and particularly relates to a frontal crash barrier segmentation method based on vehicle front structure data. First, a force wall crash database of a target vehicle model is constructed, and a deformation crush area of the target vehicle model is calculated based on a force wall crash curve in the force wall crash database to represent an X-direction barrier segmentation scheme. Then, a vehicle front structure database of the target vehicle model is constructed, and off-the-ground height data of a vehicle front energy absorption component is screened based on the vehicle front structure database to represent a Z-direction barrier segmentation scheme. Finally, an initial vehicle barrier is constructed based on the X-direction barrier segmentation scheme and the Z-direction barrier segmentation scheme, and the crash side and the opposite side of the initial vehicle front barrier are subjected to corner cutting processing to generate a final vehicle barrier. The present application can solve the problem that the existing frontal crash barrier cannot well represent the real vehicle front structure.

The present invention belongs to the technical field of optical devices, and specifically relates to a double telecentric lens, comprising an optical device, wherein the optical device is sequentially provided with a first lens G1 with positive focal power and a biconvex structure, a second lens G2 with negative focal power and a meniscus structure, a third lens G3 with positive focal power and a biconvex structure, a fourth lens G4 with negative focal power and a biconcave or plano-concave structure, a beam splitter prism P, a fifth lens G5 with negative focal power and a biconcave structure, a sixth lens G6 with positive focal power and a meniscus structure, and a seventh lens G7 with positive focal power and a meniscus or plano-convex structure from the object side to the image side, wherein the second lens G2, the third lens G3 and the fourth lens G4 form a triplet lens U1. The present invention can correct the chromatic aberration existing in a high-magnification telecentric lens, and at the same time reduce the aberration borne by a single refractive surface of the lens, and effectively reduce the tolerance sensitivity of the optical device.

The application discloses a low-tolerance and high-sensitivity large-view-field main-focus astronomical optical system, which comprises a main mirror, a correcting mirror A, a correcting mirror B, a correcting mirror C, a correcting mirror D, a correcting mirror E, a correcting mirror F and a focal plane; wherein light is reflected by the main mirror, and then sequentially passes through the correcting mirror A, the correcting mirror B, the correcting correcting mirror C, the correcting mirror D, the correcting mirror E and the correcting mirror F to reach the focal plane; the main mirror is a concave aspheric mirror, and the surface shape is a quadratic hyperboloid or a high-order aspheric surface. The application realizes low machining and assembling tolerance sensitivity while ensuring excellent large-view-field imaging of the main-focus optical system; through analyzing the distribution of aberration on each optical surface, the position and structure parameters of special glass materials and the optical power of optical elements are optimized, the average of the contribution of each optical surface aberration is realized, and thus the machining and assembling tolerance sensitivity is reduced.

The present invention relates to a wide-angle lens with a large image area, comprising a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a stop, a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10) arranged in sequence from the object side to the image side along an optical axis, wherein the first lens (L1), the second lens (L2), the fifth lens (L5) and the seventh lens (L7) are negative power lenses; and the third lens (L3), the fourth lens (L4), the sixth lens (L6), the eighth lens (L8), the ninth lens (L9) and the tenth lens (L10) are positive power lenses. The wide-angle lens with a large image area of ​​the present invention takes into account both wide-angle and low distortion performance, has a half field angle greater than 60°, and has an automatic temperature compensation function, and is not out of focus within a temperature range of ‑40°C to 85°C.

The invention discloses an optical imaging system. The optical imaging system is a seven-piece aspherical structure, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an infrared filter and an image sensor, which are arranged in sequence from the object side to the image side. The first lens has a positive refractive power, the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a refractive power, and the fifth lens has a refractive power. The object side surface of the fifth lens is a reverse curved shape, and the central part is convex toward the object surface direction. The edge part of the fifth lens is all curved toward the object surface direction, and its shape is an Arabic numeral "3". The sixth lens has a refractive power, and the seventh lens has a refractive power. The optical imaging system can well solve the stray light problem, greatly reduce the tolerance sensitivity of the camera module to the surface error, eccentricity, concentricity and tilt error, and improve the yield rate of the camera module.

The patent discloses a large-angle medical capsule endoscope optical system, and belongs to the optical lens field, which comprises first lens elements (L1), second lens elements (L2), optical filters (IR), light barriers (STO), third lens elements (L3), fourth lens elements (L4) and fifth lens elements (L5) arranged in sequence from an object plane to an image plane; and the focal lengths of the lens elements satisfy the following relationships: -135.02 < f1 / f < -138.73; -1.652 < f2 / f < -1.926; 1.349 < f3 / f < 1.682; 1.228 < f4 / f < 1.619; -1.346 < f5 / f < -1.304. The large-angle medical capsule endoscope optical system has good depth of field, small aperture, good tolerance, small distortion, and comparable resolution in liquid and air.

The present invention relates to a large aperture, large target surface, long focus optical lens and an imaging method thereof, comprising a first lens, a second lens, a stop, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from left to right along the incident light path of light; without considering the backcurvature caused by the aspheric coefficient, the first lens is a double concave negative lens, the second lens is a double convex positive lens, the third lens is a meniscus positive lens, the fourth lens is a double convex positive lens, the fifth lens is a double concave negative lens, the sixth lens is a double convex positive lens, and the seventh lens is a meniscus negative lens; wherein the fifth lens and the sixth lens are a cemented lens group. The lens can solve the problems of small imaging target surface and poor light transmission performance while meeting the requirements of high resolution and long focal length.