75 results about "Half field" patented technology

The invention provides an optical imaging device, which comprises a lens group, a spacing element group and a lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a sixth lens which are sequentially arranged at intervals from the object side to the image side of the optical imaging device, and the half Semi-FOV of the maximum half field angle of the optical imaging device and the numerical aperture fno of the optical imaging device meet the following conditions: 1lt; fno / tan (Semi-FOV) < = 1.25; the effective focal length f of the optical imaging device and the effective focal length f1 of the first lens meet the following formula:-2.3 lt; f1 / flt; -1.2,-1.2; the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the effective focal length f1 of the first lens meet the following condition:-1.45 < = (d0s-d1s) / f1lt; and-0.85. The problem that in the prior art, an ultra-wide-angle and large-aperture optical imaging device is serious in stray light is solved.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; a seventh lens with focal power; the effective focal length f of the optical lens, the radian theta of the maximum half field angle and the real image height IH corresponding to the maximum field angle meet the following conditions: 0.9 lt; (IH / 2) / (f * theta) lt; and 1.0. According to the optical lens provided by the invention, through reasonable configuration of the surface types of the lenses and reasonable matching of the focal power, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

The invention provides an imaging optical system, a lens unit, and an imaging apparatus. The imaging optical system includes eight lenses in which a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens are arranged in order from an object side to an image side, the first lens and the second lens each having a negative refractive power, the sixth lens and the seventh lens have positive refractive power in a state in which the sixth lens and the seventh lens are joined to each other, and a half angle of view of the imaging optical system is 60 degrees or more.

The utility model discloses an optical imaging lens. The optical imaging lens comprises an imaging lens group and a spacing element group which are arranged in a lens barrel, the imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object side to the image side along the optical axis; the spacing element group comprises a fifth spacing element arranged on the image side of the fifth lens; the optical imaging lens satisfies the following conditions: 68.00 degree lt; the Semi-FOV is less than or equal to 74.24 degrees, (R12 + R9) / (R12-R9) is more than or equal to 0.76 and less than or equal to 2.46, and (D5s-d5s) / CP5 is more than or equal to 0.94 and less than or equal to 2.73; the Semi-FOV is the maximum half field angle of the optical imaging lens, the R9 is the curvature radius of the object side surface of the fifth lens, the R12 is the curvature radius of the image side surface of the sixth lens, the D5s is the outer diameter of the object side surface of the fifth spacing element, the d5s is the inner diameter of the object side surface of the fifth spacing element, and the CP5 is the maximum thickness of the fifth spacing element.

An imaging lens includes a first, second, third, fourth, fifth, and sixth lens. The first lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power and includes a concave surface facing the object side. The third lens has refractive power and includes a convex surface facing the image side. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens has refractive power. The sixth lens is a biconvex lens with positive refractive power. The imaging lens satisfies the condition: 87mm. 2 ≤fLL×TTL≤111mm 2 Or condition: 12 degrees / mm ≤ HFOV / fLL ≤ 17 degrees / mm; where fLL is the effective focal length of the lens closest to the image side, TTL is the distance from the object side of the first lens to the imaging surface along the optical axis, and HFOV is the half field of view of the imaging lens.

The application discloses an optical imaging lens, which comprises first, second, third, fourth, fifth and sixth lenses in sequence from the object side to the image side. A circumferential area of the object side of the first lens is concave; a circumferential area of the image side of the second lens is concave; a circumferential area of the image side of the third lens is convex; an optical axis area of the object side of the fifth lens is convex; the first, fourth and sixth lenses have positive refractive power, and satisfy 28.000≤HFOVD21t42 / (D11t21+D42t62), so that the advantages of large field of view, small aperture value and good imaging quality can be achieved. HFOV represents the half field of view of the optical imaging lens, D21t42 represents the distance on the optical axis from the object side of the second lens to the image side of the fourth lens, D11t21 represents the distance on the optical axis from the object side of the first lens to the object side of the second lens, and D42t62 represents the distance on the optical axis from the image side of the fourth lens to the image side of the sixth lens.

The present application discloses an imaging lens, which includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens and the fifth lens each have negative optical power; the second lens has positive or negative optical power; the fourth lens, the sixth lens, and the seventh lens each have positive optical power; and the third lens has positive optical power. The imaging lens has a maximum half field of view (HFOV) that satisfies 1.7 < tan(HFOV) < 2.5; and the number of lenses having optical power in the imaging lens is seven.

The utility model belongs to the technical field of radio frequency tags, and particularly relates to an RFID tag structure for managing glasses. The stress relief structure comprises a plane material, the plane material is provided with at least two stress relief holes, the at least two stress relief holes are located on the same horizontal line or the same vertical line of the plane material at the same time, and the at least two stress relief holes are used for allowing strip-shaped objects on glasses to penetrate through; the antenna is arranged on the surface of the plane material, and the antenna is adjacent to or intersected with the strip-shaped object; when the antenna is intersected with the strip-shaped object, the communication area of the antenna is not overlapped with the strip-shaped object in spatial position, and the reflection area of the antenna is overlapped with the strip-shaped object in spatial position; and the chip is arranged in the communication area of the antenna. The utility model is used for solving the technical problems that in the prior art, communication signals can be shielded and reflected when a conventional RFID tag is in a metal back pasting environment, and if an anti-metal tag is used, on-site half-field failure and high cost are caused.

The application provides an optical imaging lens, comprising seven lenses, a plurality of spacer elements and a lens barrel; the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d0m of the image side end surface of the lens barrel satisfy 1 < d0s / d0m < 2; the maximum half field angle Semi-FOV of the optical imaging lens and the F number FNO of the optical imaging lens satisfy -3 < tan (Semi-FOV) / FNO < -2; the inner diameter d1s of the object side surface of the first spacer element, the effective focal length f1 of the first lens, the inner diameter d6s of the object side surface of the sixth spacer element and the effective focal length f7 of the seventh lens satisfy -2 < d1s / f1+d6s / f7 < 0. The application solves the problem of serious stray light of the optical imaging lens in the prior art.

The application discloses a VR optical system and a near-eye display device, the VR optical system comprising an optical lens close to an eye side and at least one microlens array close to a display side; the optical lens has positive focal power, the optical lens has a first surface close to the eye side and a second surface away from the eye side, at least one of the first surface and the second surface is aspherical, and the first surface is convex; the microlens array has a plurality of microlens units, and the plurality of microlens units have the same or different focal lengths; wherein the VR optical system satisfies a condition formula: 1.5 < TTL / (f*tanθ) < 3, TTL represents the total optical length of the VR optical system, f represents the effective focal length of the VR optical system, and theta represents the maximum half field angle of the VR optical system. By setting the optical lens and the microlens array, multiple fields of view can be established, the field of view in each small range is optimized, and therefore clearer imaging quality can be obtained, and the resolving power of the VR system is improved.

The application discloses an optical camera lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative refractive power; a second lens with positive refractive power; a third lens with positive refractive power; a fourth lens with positive refractive power or negative refractive power; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power; an eighth lens with positive refractive power; a ninth lens with negative refractive power; the maximum half field of view Semi-FOV of the optical camera lens, the effective focal length f of the optical camera lens and the radius of curvature R18 of the image side surface of the ninth lens satisfy: 1.5 < tan(Semi-FOV) x f / R18 < 2.5; and the air interval T56 of the fifth lens and the sixth lens on the optical axis, and the air interval T23 of the second lens and the third lens on the optical axis satisfy: 24.0 < T56 / T23 < 27.0.

This invention provides an optical camera lens, comprising: seven lenses, the seven lenses being sequentially arranged from the object side to the image side of the optical camera lens, including a first lens to a seventh lens; a plurality of support members, at least including a second support member located on the image side of a second lens and at least partially in contact with the image side surface of the second lens; and a lens barrel for accommodating the lenses and the support members; wherein the half field of view of the optical camera lens is greater than 100°; the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the inner diameter d2s of the object side surface of the second support member satisfy the following: -2.8 < (R3 + R4) / d2s < -0.35. This invention solves the problem of severe stray light in existing optical camera lenses.

The application discloses an optical system and an optical device comprising the same. The optical system comprises a lens barrel, a lens assembly, a reflection assembly and a spacer assembly arranged in the lens barrel. The lens assembly comprises a first lens, a second lens and a third lens arranged in sequence from a first side to a second side along an optical axis. The spacer assembly comprises at least one spacer arranged between two adjacent lenses in the lens assembly. The lens barrel has a front end face facing the first side and a rear end face facing the second side. The maximum outer diameter of the front end face of the lens barrel is smaller than the maximum outer diameter of the rear end face of the lens barrel. The inner diameter d0m of the rear end face of the lens barrel, the maximum half field of view HFOV of the optical system and the maximum height L of the lens barrel along the optical axis direction satisfy the following relationship: 1.0 < tan(HFOV) x d0m / L < 1.5.

The invention provides a CMS visual field checking method. The method comprises the following steps: determining the current pixel numbers of a camera in the horizontal direction and the vertical direction according to the orientation of the current camera and the preset pixel numbers of the camera in the horizontal direction and the vertical direction; calculating a horizontal half field angle and a vertical half field angle of the camera; calculating one or more horizontal reference angles and vertical reference angles according to the one or more preset reference points and the entrance pupil center of the camera; determining the angle offset of the camera according to the eccentric parameter of the camera; determining a horizontal reference angle and a vertical reference angle of the camera according to the angle offset, the horizontal reference angle and the vertical reference angle; comparing the horizontal half-field angle and the vertical half-field angle with one or more horizontal reference angles and one or more vertical reference angles to obtain a comparison result; and when the comparison result does not meet the requirement, adjusting the mounting angle or the field angle of the camera to meet the requirement according to the comparison result. The invention also provides a CMS visual field checking device and a camera.

The invention discloses a rear-view lens and a camera module. The rear-view lens adopts nine glass lenses. Through the reasonable matching of the surface shape and the optical focal length of each lens, and the matching of spherical and aspherical lenses, the direction of light in different fields of view is controlled. The rear-view lens has the effects of a large field of view angle (half field of view angle of 95°), high resolution (the central area transfer function MTF is between 0.2 and 0.7 when the spatial frequency is 160lp / mm), and the magnification of the central area is greater than that of the peripheral area. In addition, the rear-view lens has a large image plane (half image height of 4.9mm), a large amount of light entering the lens (F#=1.8), and good temperature stability (all-glass lens), thereby meeting the use requirements of vehicle-mounted products.

The application discloses an optical imaging system, which comprises a first lens, a second lens, a third lens with negative focal length, a fourth lens, a fifth lens with positive focal length, a sixth lens with positive focal length and a seventh lens in sequence from the object side to the image side along the optical axis, wherein the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a concave surface; and the half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging system ImgH, the aperture number Fno of the optical imaging system, the distance BFL between the image side surface of the seventh lens and the imaging surface on the optical axis, the combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R9 of the object side surface of the fifth lens, the curvature radius R12 of the image side surface of the sixth lens, the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis and the maximum half field angle Semi-FOV of the optical imaging system satisfy the following conditions: 5.0mm<ImgHxFno / 2<9.2mm; -1.0<(BFL-f56) / (R9-R12)<0; and 3.0mm<TTL / Fnoxtan(Semi-FOV)<5.0mm.

The application provides a CMS field of view calibration method, which comprises the following steps: determining the current horizontal direction and vertical direction pixel numbers of a camera according to the current orientation of the camera and the preset horizontal direction and vertical direction pixel numbers of the camera; calculating the horizontal half field of view angle and the vertical half field of view angle of the camera; calculating one or more horizontal reference angles and vertical reference angles according to one or more preset reference points and the center of the camera entrance pupil; determining the angle offset of the camera according to the eccentricity parameter of the camera; determining the horizontal reference angle and the vertical reference angle of the camera according to the angle offset, the horizontal reference angle and the vertical reference angle; comparing the horizontal half field of view angle and the vertical half field of view angle with the one or more horizontal reference angles and vertical reference angles to obtain a comparison result; and adjusting the installation angle or the field of view angle of the camera to meet the requirements according to the comparison result when the comparison result does not meet the requirements. The application also provides a CMS field of view calibration device and a camera.

The embodiment of the invention discloses a lens module, a camera and electronic equipment, and relates to the field of optical imaging. The objective of the invention is to enable the lens to have a large light incoming amount under a large field angle. According to the specific scheme, the lens module comprises a lens assembly and a view field modulation element located on the object side of the lens assembly. The lens assembly is used for imaging and comprises a plurality of lenses with coaxial optical axes; wherein the imaging aperture of the field-of-view modulation element is SD; the distance between the image side surface of the field modulation element and the object side surface of the lens assembly is CD, and the half field angle of the lens module is HFOV; the entrance pupil diameter of the lens module is EPD; sDlt; (EPD + CD * tan (HFOV)). The field-of-view modulation element and the lens assembly meet the above formula, and the aberration of large-field-of-view imaging light can be reduced, so that the lens has a large light incoming amount under a large field-of-view angle. The lens assembly comprises a plurality of lenses which solve the problems of chromatic aberration, astigmatism, field curvature and the like.

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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has positive optical power, and its object-side surface is convex; the second lens has negative optical power, and its image-side surface is concave; the third lens, the fourth lens, the fifth lens, and the sixth lens all have positive or negative optical power; the object-side surface of the sixth lens is concave, and the image-side surface is convex; the seventh lens has negative optical power, and its object-side surface is concave. The maximum half field of view (HFOV) of the optical imaging lens satisfies HFOV≤30°.

The invention discloses an optical lens and a laser radar. The maximum full field angle of the optical lens is within the range of 8-35 degrees, and the angular resolution value AR05 of any position of the half field angle of the optical lens within the range of 0-5 degrees and the angular resolution value ARS of the maximum half field angle of the optical lens meet the condition that AR05 is smaller than or equal to 86.2% ARS.

A wide-angle lens, wherein the wide-angle lens includes a lens group and an aperture, the multiple lenses in the lens group are arranged in sequence from the object side in a manner of sandwiching the aperture, when the maximum half field angle of the wide-angle lens as a whole is set to ω, the following relationship is satisfied: 98°<ω<120°, when the focal length of the wide-angle lens as a whole is set to f and the incident pupil diameter of the wide-angle lens as a whole is set to HEP, the following relationship is satisfied: f / HEP<2.3, the lens group includes a first lens, the first lens is arranged at the position closest to the object side, and the first lens is a negative lens with a concave surface facing the image side, when the effective radius of the image-side lens surface of the first lens is set to sd12 and the curvature radius of the image-side lens surface of the first lens is set to R12, the following relationship is satisfied: 0.890<sd12 / R12<0.970.

The invention relates to the technical field of wide-angle lenses, and discloses a large-aperture ultra-wide-angle micro single lens, which comprises a first lens group, a second lens group and a third lens group. The third lens group includes a front half group and a rear half group. The first lens group, the second lens group, the front half group and the rear half group are sequentially arranged from the object side to the image plane side. When an object moves from an infinite distance to a close distance, the first lens group and the third lens group are fixed, the second lens group moves towards an image plane direction, focusing is realized, and 0.65 < = F23A / tan omega * BFL < = 1.55. During use, in an infinite state, the aperture, the field angle and the focal length can be balanced by reasonably distributing the focal power and the spacing of each lens and controlling the half field angle of the optical system, so that a certain parameter is prevented from deviating from a normal range. Under the condition that F23A / tan omega * BFL is larger than or equal to 0.65 and smaller than or equal to 1.55, the ultra-large aperture and ultra-wide angle can be achieved, the ultra-large aperture ultra-wide angle lens can be used for complex scenes, and the harsh requirements of complex use environments are met.

The monitoring optical system with compact structure and large field of view and high image quality belongs to the technical field of monitoring optical system. The prior art cannot meet higher requirements in field of view size, imaging quality, compactness degree, weight and volume. The monitoring optical system comprises, in order from the object side to the image side along the optical axis: a linear polarizing film LP, a front quarter-wave film QWP1, a beam splitting film BP, a turnaround lens with negative focal power, a rear quarter-wave film QWP2, a reflective polarizing film RP, a turnaround compensation lens with negative focal power, and a doublet rear successor lens group; the turnaround compensation lens is separated from the doublet rear successor lens group; the ratio of the total optical length TTL of the monitoring optical system to the tangent tan(HFOV) of the half field of view HFOV satisfies the relationship: 9mm < TTL / tan(HFOV) < 17mm; the ratio of the maximum effective half aperture D of the turnaround lens to the focal length f of the monitoring optical system satisfies the relationship: 0.5 < D / f < 0.9. The total optical length TTL is only 96.4mm; the maximum half field of view HFOV is 96.3°; and the MTF at 60lp / mm can all reach above 0.48. max just 96.3°; the MTF at 60lp / mm can all reach above 0.48.

The application discloses an optical imaging lens, which comprises: a lens group comprising, in sequence from an object side to an image side along an optical axis, a first lens, a second lens, a third lens and a fourth lens, wherein the first lens has positive refractive power; a plurality of spacer elements comprising at least four spacer elements; and a lens barrel for accommodating the lens group and the plurality of spacer elements, wherein a surface of at least one spacer element in the direction of the optical axis is in contact with an inner wall of the lens barrel; the height L of the lens barrel in the direction of the optical axis, the effective focal length f of the optical imaging lens, the outer diameter D0m of an image end face of the lens barrel close to the image side, the distance TD on the optical axis from the object side face of the first lens to the image side face of the fourth lens and the maximum half field of view Semi-FOV of the optical imaging lens satisfy: L / D0m+TD / [f*tan(Semi-FOV)]<1.5.

The invention provides a six-piece type optical lens group for a vehicle-mounted lens. The six-piece type optical lens group is sequentially composed of a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens and a sixth lens from the object side to the image side. The optical lens group satisfies the following conditional expression: 0.014 lt; (R7 + R8) / f4lt; 0.08 part of the composition; wherein R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and f4 is the focal length of the fourth lens; 1.8 lt, 1.8 lt; (AT45 + AT56) / CT5lt; 4.6); wherein AT45 is the air gap between the fourth lens and the fifth lens, AT56 is the air gap between the fifth lens and the sixth lens, and CT5 is the thickness of the fifth lens on the optical axis; 0.38 lt, 0.38 lt; r12 / f6lt; 1.4, 4; wherein R12 is the curvature radius of the image side surface of the sixth lens, and f6 is the focal length of the sixth lens. The optical distortion can be controlled within 1.8%-4.6% within the half field angle range of 78-83 degrees, and meanwhile, excellent chromatic aberration correction is achieved, so that the comprehensive defects of the field angle, distortion, system size and image quality in the prior art are overcome.

The application discloses an optical imaging lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens and a fourth lens; wherein the first lens has positive refractive power, and the object side surface thereof is a convex surface; the second lens has negative refractive power, and the object side surface thereof is a concave surface; the third lens has refractive power; the fourth lens has negative refractive power, and the object side surface thereof is a concave surface; the total effective focal length f of the optical imaging lens, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis, and the half of the diagonal line length of the effective pixel area on the imaging surface of the optical imaging lens ImgH satisfy 1.75mm < f*(ImgH / TTL) < 2.05mm; the maximum half field of view Semi-FOV of the optical imaging lens satisfies 22.53° ≤ Semi-FOV < 30°; the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy -1.1 ≤ f2 / f < -0.3; and the total effective focal length f of the optical imaging lens and the effective focal length f4 of the fourth lens satisfy -1.04 ≤ f / f4 ≤ -0.63.

The application discloses an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a first lens with negative focal length, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative focal length, the object side of which is a concave surface; a third lens with positive focal length, the object side of which is a convex surface; a diaphragm; a fourth lens with positive focal length, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with negative focal length; a sixth lens with positive focal length, the object side of which is a convex surface; and a seventh lens with negative focal length; wherein the image height IH corresponding to the maximum half field angle of the optical lens and the effective focal length f of the optical lens satisfy 1.0 < IH / f < 1.4. The application can effectively reduce the total length and volume of the optical lens and realize the characteristics of large field angle, small distortion, high pixels and the like.

The present application discloses a camera lens, which includes, in order from the object side to the image side along the optical axis: a first lens having negative optical power; a second lens having positive optical power, whose object-side surface is concave; a third lens having positive optical power; a fourth lens having negative optical power; and a fifth lens having positive optical power. The distance TTL from the object-side surface of the first lens to the imaging plane of the camera lens on the optical axis, the maximum half field of view (Semi-FOV) of the camera lens, and the F-number (Fno) of the camera lens can satisfy the following conditions: 4.5mm < TTL × Fno / tan (Semi-FOV) < 8.0mm; and the effective focal length f1 of the first lens and the effective focal length f3 of the third lens can satisfy the following conditions: -3.5 < f1 / f3 < -1.5.

The invention discloses an optical imaging lens, the optical imaging lens comprises a lens barrel, and a lens group and a separator group which are arranged in the lens barrel, and the lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with negative focal power from an object side to an image side along an optical axis; the second lens has positive focal power; the third lens has positive focal power; the fourth lens has focal power; the fifth lens has focal power; the separator group comprises at least one separator arranged between two adjacent lenses; the aperture number fno of the optical imaging lens and the maximum half field angle Semi-FOV of the optical imaging lens meet the following formula: 2lt; fno * tan (Semi-FOV) is less than or equal to 2.1671; the optical imaging lens further meets the condition that (D0s-DT11) / (D0m-DT52) is larger than or equal to 0.9111 and smaller than or equal to 1.3482, D0s is the outer diameter of the end face of the object side of the lens barrel, D0m is the outer diameter of the end face of the image side of the lens barrel, DT11 is the diameter of the light-transmitting part of the object side face of the first lens, and DT52 is the diameter of the light-transmitting part of the image side face of the fifth lens.

The invention belongs to the technical field of optics, and particularly relates to an optical lens and electronic equipment. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens which are sequentially and coaxially arranged from the object side to the image side. The first lens has positive focal power, and the second lens and the third lens have negative focal power; the fourth lens and the fifth lens are cemented lenses, the fourth lens has negative focal power, and the fifth lens has positive focal power; the sixth lens, the seventh lens, the eighth lens and the ninth lens all have positive focal power; the tenth lens and the eleventh lens respectively have negative focal power, and the half field angle of the optical lens is 30-40 degrees; the image space target surface size IMG of the optical lens is 8-14 mm; the effective focal length f of the optical lens is 6-10 mm.