462 results about "Large aperture" patented technology

The invention discloses an optical lens which is sequentially arranged from an object side to an image side along an optical axis of the lens: a first lens which is a glass lens with negative focal power; the second lens has negative focal power; the third lens is provided with positive focal power; a fourth lens, wherein the fourth lens has positive focal power or negative focal power; an aperture stop; a fifth lens, wherein the fifth lens has a positive focal power or a negative focal power; a sixth lens having a positive focal power or a negative focal power; a seventh lens having a positive focal power or a negative focal power; and the eighth lens is a plastic lens with positive focal power or negative focal power. The lens is formed by mixing glass and plastic, the field angle is larger than or equal to 200 degrees, the aperture is larger than or equal to 1.9, and the lens has the advantages of being large in field of view, large in aperture, high in imaging quality and high in brightness.

The invention relates to a pre-compensation flexible assembling and adjusting mechanism of a large-diameter transmission reflector. The pre-compensation flexible assembling and adjusting mechanism comprises the large-diameter transmission reflector, a glue joint mandrel, an isolation telecentric flexible hinge, an isolation plate, a hooke flexible hinge, an adjusting flexible branch chain, an anti-rotation flexible branch chain, a back plate and a driving assembly. The large-aperture transmission reflector is provided with three blind holes for glue joint, and is connected with the isolation plate through three groups of glue joint mandrels and isolation telecentric flexible hinges, so that isolation of load deformation interference of the isolation plate is realized; the driving ends of the two adjusting flexible branch chains are correspondingly connected with two driving assemblies installed on the back plate, and the connecting ends of the adjusting flexible branch chains are connected with the isolation plate. One ends of the Hooke flexible hinges and the anti-rotation flexible branch chains are connected with the isolation plate, and the other ends are connected with the back plate; the device has the advantages of being simple in structural form, stable in movement and high in precision, meanwhile, the return clearance caused by axial load reversing under heavy loads can be avoided, the additional surface shape caused by assembling and adjusting stress is effectively isolated, and the additional surface shape caused by gravity is compensated.

The invention provides an optical lens, which comprises four lenses with focal power 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 along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; wherein the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following conditions: 35 degrees / mmlt; fOV / IHlt; 46 degrees / mm; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy 0.5 lt; f3 / f4lt; and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large aperture, high imaging quality, high collimation and the like.

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power from an object side to an imaging surface along an optical axis, the second lens has positive focal power; the object side surface of the third lens is a concave 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 object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; wherein the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens meet the formula: (R13 + R14) / (R13-R14) lt, and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.

The utility model relates to an ultra-wide-angle lens, which is arranged along an optical axis in a direction from an object side to an image side. The utility model relates to a multi-lens zoom lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, the object side surface of the sixth lens is convex; the optical total length TTL, the total focal length f and the image height H under the maximum field angle of the ultra-wide-angle lens meet the following relation: TTL * f / H is more than or equal to 6.9 and less than or equal to 7.4. The ultra-wide-angle lens of the utility model at least has one of the characteristics of large field of view FOV > = 196 DEG optical total length, good thermal stability, high resolution, large aperture (FNO < = 1.8), high illumination and the like.

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 negative 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 object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave 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 object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the optical total length TTL of the optical lens and the aperture value Fno of the optical lens meet the following conditions: 6.2 mmlt; tTL / Fnoult is carried out; 7.4 mm. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of miniaturization, large wide angle, large aperture, high imaging quality and the like.

The invention provides an optical lens, which comprises eight lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive 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 along an optical axis, the object side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave 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 object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; and the eighth lens has negative focal power. The optical lens provided by the invention has one or more advantages of long focus, large aperture, high imaging quality and the like.

The invention provides an optical lens, which consists of eight lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative 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 object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image 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 concave surface; the fifth lens has positive focal power; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface; and the object side surface of the eighth lens is a convex surface in a paraxial position, and the image side surface of the eighth lens is a concave surface in a paraxial position. The optical lens provided by the invention has one or more advantages of large field angle, large aperture, high imaging quality and the like.

The utility model relates to an optical lens which is arranged along an optical axis from an object side to an image side. The utility model relates to a multi-lens zoom lens, which 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 positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with negative focal power in sequence, and is characterized in that the first lens with negative focal power, the second lens with negative focal power, the third lens with positive focal power, the fourth lens with negative focal power, the fifth lens with positive focal power, the sixth lens with negative focal power, the seventh lens with positive focal power and the ninth lens with negative focal power are included; the focal power of the tenth lens is positive; the focal power of the eleventh lens is positive; the first lens is a convex-concave lens, and the eleventh lens is a convex-concave lens. The optical lens provided by the utility model at least has one of the characteristics of large aperture (F1.2), infrared confocal, 2K high image quality, support of dual-optical-path imaging, distance measurement and the like.

The invention discloses a large-aperture internal focusing type standard photographic lens and a photographic device. The lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 1 < = F1 / F < = 3; 0.5 < = F2 / F < = 1.5; -5 < = F3 / F < =-3; wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The large-aperture internal focusing type standard photographic lens provided by the technical scheme of the invention is beneficial to optimization of optical performance, focusing mechanism, balance of positive and negative focal power and simplification of design and manufacturing of the lens.

The utility model discloses an optical lens. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object plane to an image plane along an optical axis, the first lens is a negative-focal-power convex-concave lens, the second lens is a negative-focal-power concave-convex lens, the third lens is a positive-focal-power biconvex lens, and the seventh lens is a positive-focal-power biconvex lens. The fourth lens is a positive-focal-power biconvex lens, the fifth lens is a positive-focal-power biconvex lens, the sixth lens is a negative-focal-power biconcave lens or a negative-focal-power concave-flat lens, and the seventh lens is a positive-focal-power convex-concave lens; meanwhile, the focal length F of the optical lens and the distance TTL from the center of the optical axis of the object side face of the first lens to the image face are set, TTL / F is smaller than or equal to 5.5, and under the condition that it is guaranteed that the optical lens is small in size, the high pixel, the large aperture and the large angle are achieved, and the use requirements are met.

The utility model provides a large-aperture small-volume optical imaging system and a camera module applying the same, which are composed of eight lenses, the first lens has positive focal power, the object side surface is a convex surface, the image side surface is a convex surface, the second lens has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the third lens has positive focal power, the image side surface is a convex surface, and the fourth lens has negative focal power. The fourth lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the fifth lens has negative focal power, the object side surface is a concave surface; the sixth lens has positive focal power, the object side surface is a convex surface; the seventh lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; according to the optical lens, aberration can be effectively corrected, so that the optical lens has better imaging quality, larger aperture size, smaller volume and better thermal stability, and the overall imaging quality is improved.

The present invention relates to a variable aperture device for a camera module. The device comprises: a base having a base aperture and a pair of blade guides; a pair of main blades guided by the blade guides; a pair of supplemental blades guided by the blade guides; a cover that is fixed to the base and has a cover aperture; and an actuator for moving the main blades and the supplemental blades relative to the base. Each of the main blades has a respective notch. The notches collaboratively define a central aperture and a fixed aperture. Each of the supplemental blades has a respective notch. The notches collaboratively define a minimum aperture and a maximum aperture.

The invention provides an optical lens, which comprises eight lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; 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 object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power, and the object side surface of the seventh lens is a convex surface; the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large image plane, a large aperture, high imaging quality and the like.

The invention discloses a large-aperture telescope shafting angle detection method based on an arc grating encoder. The method comprises the following steps of: tensioning and mounting a linear grating ruler along the circumference of a shaft system turntable to form an arc grating body; n reading heads are uniformly arranged along the circumference of the rotation direction of the shaft system, the rotation position information of the shaft system is read, the effective range of the arc grating is calculated and converted into angle information, and the resolution of the arc grating is calculated; installing a full-circle grating, obtaining the detected shafting rotation position information, comparing the detected shafting rotation position information with the arc grating angle detection information, and verifying the correctness of the position information obtained by the arc grating. The arc grating is used for replacing an angle measurement grating, the measuring range and the resolution of the arc grating can be accurately obtained, the correctness of information obtained by the arc grating is verified through the concentric-shaft full-circle grating, the closed-loop effect does not exist, the machining difficulty is low, meanwhile, the length of the grating ruler can be selected according to the rotation range of a shaft system, and the measurement precision is high. And the installation and adjustment difficulty is reduced.

The invention discloses a large-target-surface high-resolution unmanned aerial vehicle lens and electronic equipment. The lens sequentially 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 and a ninth lens from an object side to an image side. The first lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the second lens has negative diopter, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface. The invention provides an innovative optical design for solving the problem that an existing unmanned aerial vehicle lens cannot give consideration to light weight, high definition, large target surface, large aperture and large field angle. Through the glass-plastic mixed design, the use number of glass lenses is reduced, and meanwhile, the unmanned aerial vehicle lens with a large target surface, a small size and high resolution is realized by matching with a sensor with a 1 / 0.98 inch target surface. The lens can meet the high resolution requirement of more than five million pixels, and the imaging quality is remarkably improved.

The invention provides an optical lens, which comprises six lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative 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 along an optical axis, the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; 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 object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of a large field angle, a large aperture, miniaturization and the like while realizing a good infrared confocal effect.

The wide-angle lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object plane to an image plane along an optical axis, the first lens is a glass spherical lens with negative focal power, the object side face of the first lens is a convex face, and the image side face of the first lens is a concave face. The second lens is a plastic aspheric lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface. The third lens is a plastic aspheric lens with positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface. The fourth lens is a plastic aspheric lens with positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a convex surface. The glass spherical surface and the plastic aspheric surface are matched and combined, the resolution is improved, the total axis length is smaller than 10.5 mm, the aperture F can reach 1.6, the field angle FOV can reach 183 degrees, the relative illumination can reach 50%, and the lens has the advantages of being large in aperture, ultra-large in field angle, small in size and high in illumination.

The invention provides a five-piece type large-aperture optical system. The five-piece type large-aperture optical system sequentially comprises a diaphragm, a first lens and a second lens from an object side to an image side along an optical axis; the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface is a plane or a concave surface; the second lens has negative focal power, 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 or a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface or a plane, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface is a plane or a concave surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the total length of the optical system meets the relational expression: 6.6 mmlt; tTLlt; the aperture number of the optical system meets the relational expression: 1.4 lt; fNOlt, FNOlt; tTL is the total length of the optical system, and FNO is the number of apertures of the optical system, so that the five-piece large-aperture optical system becomes a miniature system with small size and light weight.

Disclosed is a camera optical lens. The camera optical lens includes from an object side to an image side in sequence: 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. The camera optical lens satisfies the following conditions: 1.00≤d3 / d1≤3.00; 0.20≤R3 / R4≤0.90; 1.00≤f4 / f3≤4.00; 0.50≤f6 / f7≤1.40; 1.80≤nd8≤2.20. The thicknesses on-axis of the first lens and the second lens are d1 and d3, respectively. The curvature radius of the object side surface and image side surface of the second lens are R3 and R4, respectively. The focal lengths of the third lens, the fourth lens, the sixth lens, and the seventh lens are f3, f4, f6, and f7, respectively. The refractive index of the eighth lens is nd8. The camera optical lens has good optical performance and is characterized by a large aperture and miniaturization.

To provide an image-forming optical system that achieves both of a high image-forming performance and miniaturization / reduced weight while having a large aperture ratio, has a light focus lens group, and suppresses bleeding at the time of focusing.SOLUTION: An image-forming optical system consists of a first lens group, a second lens group, a third lens group with positive refractive power, a fourth lens group with positive refractive power, and a fifth lens group with negative refractive power, in order from the object side to the image side, the first lens group is immobile relative to an image surface at the time of focusing from an object at infinity to a near-distance object, the second lens group travels to an object side along a light axis, the third lens group is immobile relative to an image surface, the fourth lens group travels to an object side along the light axis, the fifth lens group is immobile relative to an image surface, an aperture diaphragm is provided between a lens surface in the furthest image side of the second lens group and a lens surface in the furthest object side of the fourth lens group, and a predetermined conditional expression is satisfied.SELECTED DRAWING: Figure 1

The present disclosure relates to optical lenses and discloses a camera optical lens including, from an object side to an image side in sequence: a first lens having a negative refractive power, a second lens having a refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power. The camera optical lens satisfies following conditions: 0≤(R1+R2) / (R1−R2)≤0.50; 110.00≤(FOV*f) / IH≤140.00; −1.70≤f1 / f≤1.10; and −3.00≤R5 / R6≤−0.50. The camera optical lens in the present disclosure meets a design requirement for the large aperture, ultra-thinness and wide angle.

The invention discloses a large-aperture super-structure lens and refraction lens mixed optical system design evaluation method, which comprises the following steps: (1) carrying out ray tracing optimization design based on a phase surface of a large-aperture super-structure lens and a refraction lens to obtain a target phase equation of the phase surface of the super-structure lens; (2) establishing a metasurface unit database forming the metasurface lens, and arranging metasurface units to fit a target phase of the large-aperture metasurface lens; (3) evaluating the phase fitting degree and the imaging quality of the optical system by using a large-aperture super-structure lens full-wave simulation substitution method, and evaluating the imaging quality of the optical system by using a ray tracing method; evaluating the image quality indexes of the super-structure lens and the hybrid optical system, and if the image quality indexes meet the technical requirements, completing the design of the folding and super hybrid optical system; and if the technical requirements are not met, returning to the step (1) to carry out design optimization. By using the method provided by the invention, the imaging quality of the super-structure lens in the hybrid system can be effectively evaluated.

The invention provides an imaging optical system suitable for a large aperture ratio telephoto lens which is light in weight and in which chromatic aberration on the axis is well corrected. This imaging optical system is configured from a first lens group (G1), a second lens group (G2), and a third lens group (G3), which are arranged in this order from the object side and have positive refractive power, only the second lens group (G2) moves when focusing from an object at infinity to an object at a close distance, the first lens group (G1) is configured from a group 1a and a group 1b arranged in this order from the object side, and the third lens group (G3) is configured from a group 1b and a group 1b arranged in this order from the object side. The 1b group has a meniscus-shaped negative lens (L1na) having a convex surface facing the object side and a negative lens (L1nb) different from the negative lens (L1na), the negative lens (L1na) being a negative lens located closest to the object side in the first lens group (G1), and the imaging optical system satisfies a predetermined conditional expression.

The present invention relates to a large-aperture and large-image-surface space debris monitoring optical system. The optical system is provided with a front fixed group A with negative optical power, an aperture, and a rear fixed group B with positive optical power in sequence along the incident light path. The front fixed group A is composed of a meniscus positive lens A1, a first cemented group formed by closely bonding a biconvex positive lens A2 and a biconcave negative lens A3, and a second cemented group formed by closely bonding a meniscus positive lens A4 and a meniscus negative lens A5. The rear fixed group B is composed of a biconvex positive lens B1, a biconcave negative lens B2 and a biconvex positive lens B1. The optical system consists of a third cemented group formed by closely bonding lenses B3, a biconvex positive lens B4, a fourth cemented group formed by closely bonding biconvex positive lens B5 and biconcave negative lens B6, a meniscus positive lens B7, a meniscus negative lens B8 and flat glass B9; the optical system has high resolution, low distortion, small chromatic aberration, strong monitoring capability, large aperture and large image surface, which are conducive to enhancing the energy entering the optical system, monitoring smaller space debris, and increasing the monitoring range of space debris; a weight-reduction design is adopted to effectively control the weight of the lenses, which is conducive to the carrying of aircraft.

The present invention belongs to the technical field of objective optical systems and provides a large-aperture, non-distortion, fixed-focus objective optical system adapted for a 1-inch low-light-level CMOS or CCD image plane. The system comprises a first lens group, an aperture, and a second lens group, arranged in sequence. The first lens group comprises a first lens, a second lens, and a third lens; and the second lens group comprises a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The optical specifications achieved by the system are: a wavelength band of 480nm to 1000nm, a maximum distortion of no more than 0.5%, a pixel size of 800px × 600px, and a field of view of 35.5° × 27°. The present invention aims to address the problem of existing large-aperture objective optical systems, which suffers from large distortion indexes that cause image distortion and poor overall imaging quality. The system features high resolution, a large relative aperture, and a wide wavelength band design, achieving day and night confocality, and excellent imaging quality in extreme environments.

The invention discloses an optical lens, a camera module and an electronic device, which consider the requirements of miniaturization, large field angle, large aperture and high resolution, and sequentially comprise, from an object side to an image side along an optical axis, a first lens having negative refractive power, an object side surface and an image side surface thereof being a convex surface and a concave surface at a paraxial region; the second lens element with negative refractive power has an object-side surface and an image-side surface being concave in a paraxial region. The third lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. A fourth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; the fifth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The sixth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. A seventh lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof; the eighth lens element with positive refractive power has a convex object-side surface and a concave image-side surface in a paraxial region, respectively.

The present application relates to large aperture optical machine structure engineering analysis technical field, especially to a kind of gravity unloading point layout method of large space mirror, comprising the following steps: S1: the finite element analysis model of space mirror is established, and the discrete node surface shape data and unloadable point coordinate data are exported.S2: surface shape fitting is carried out, and surface shape accuracy is calculated.S3: its surface shape residual elevation diagram is drawn, and high residual point is identified.S4: the unloadable point coordinate of space mirror is obtained.S5: space mirror is supported using unloadable point, and its degree of freedom is constrained;Finite element analysis model is updated, and step S2 is repeated, and surface shape accuracy is calculated.S6: whether surface shape accuracy meets the requirements is judged, if not, then repeat step S3 to step S5;Until meet the requirements.The present application has the advantages that, through the gravity unloading point layout of space mirror, gravity unloading point can be more accurately fixed in flexible support mode or the like during processing, and the influence of gravity on surface shape accuracy is reduced.

The embodiment of the present application discloses an optical lens. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along an optical axis from an object side to an image side; the optical power of the first lens to the seventh lens and the optical power of the optical lens satisfy a certain proportional relationship. The optical lens provided by the embodiment of the present application can realize a large-aperture miniaturized optical lens by using the optical power cooperation of each lens, and can correct the aberration of the lens by using the optical power cooperation of each lens, so as to ensure that the optical lens has high resolving power, has the characteristics of wide field of view, large aperture and large image surface, and can meet the use requirements under the temperature of-40 DEG C to 95 DEG C.

Disclosed is a camera optical lens. The camera optical lens includes from an object side to an image side in sequence: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; wherein the camera lens satisfies the following conditions: 2.00≤f3 / f≤6.00; −2.00≤f5 / f6≤−0.79; −5.00≤R7 / R8≤−1.00; −0.90≤R9 / R10≤−0.20; 0.25≤d2 / d3≤1.00. The camera optical lens has good optical performance, and can meet the design requirements for large aperture, wide-angle and ultra-thin.