320 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 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 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 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 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 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.

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 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 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.

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.

The application relates to a large-diameter high-power pseudo-Bessel beam generation method and a generation device, and belongs to the technical field of communication. The method comprises the following steps: S100, an electromagnetic beam output by a feed horn is propagated to a first reflecting surface, and a target pseudo-Bessel beam is reversely propagated to a second reflecting surface; S200, the electromagnetic beam is propagated to the second reflecting surface through the first reflecting surface, a phase difference on the second reflecting surface is obtained, and a deformation variable of the second reflecting surface is updated; S300, the target pseudo-Bessel beam is propagated to the first reflecting surface through the second reflecting surface, a phase difference on the first reflecting surface is obtained, and a deformation variable of the first reflecting surface is updated; and S400, steps S100 to S300 are repeated until the relative field distribution of the output electromagnetic beam and the target pseudo-Bessel beam reaches a stable state, and a large-diameter high-power pseudo-Bessel beam is obtained. The application can solve the technical problems of existing media loss and limited power capacity.

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 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; the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, 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; and the object side surface of the eighth lens is a concave surface, and the image side surface of the eighth lens is a concave surface near the optical axis. According to the optical lens provided by the invention, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of large field angle, large aperture, high imaging quality and the like.

The application discloses a camera optical lens, which comprises seven lenses in sequence from the object side to the image side, i.e., a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens and a seventh lens with negative refractive power; the central curvature radius R7 of the object side of the fourth lens, the central curvature radius R8 of the image side of the fourth lens, the axial distance d2 from the image side of the first lens to the object side of the second lens, the axial distance d4 from the image side of the second lens to the object side of the third lens, the axial distance d6 from the image side of the third lens to the object side of the fourth lens, the axial thickness d9 of the fifth lens, the axial distance d10 from the image side of the fifth lens to the object side of the sixth lens satisfy the following relations: 9.98 <= d9 / d10 <= 20.02; 0.50 <= R7 / R8 <= 7.00; 0.50 <= (d2+d6) / d4 <= 1.50. The camera optical lens has good optical performance and meets the design requirements of large aperture, wide angle and ultra-thin.

The application discloses an optical system and a VR glasses, the optical system has an object side and an image side which are oppositely arranged along the extension direction of the optical axis, and comprises a first lens, a second lens and a third lens which are sequentially arranged from the image side to the object side, wherein: the first lens is coated with a half-reflective and half-transmissive film on the end face close to the image side, and is coated with an AR (anti-reflective) film on the end face close to the object side; the second lens is coated with an AR film on the end face close to the image side, and is glued with a quarter-wave plate film on the end face close to the object side, and the end face of the quarter-wave plate film away from the second lens is glued with a linear polarization film; and the two end faces of the third lens close to the object side and the image side are both coated with an AR film. The application aims to provide an optical system with high image quality, a large field of view, a large aperture and less stray light, so that the user can obtain a better viewing effect.

The application relates to the field of optical lenses, and discloses a camera optical lens which is composed of seven lenses, and the seven lenses are sequentially arranged from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power; the dispersion coefficient of the first lens is v1, the refractive index of the third lens is n3, and the following relationship is met: 58.00 <= v1 <= 82.00; 1.69 <= n3 <= 2.20. The camera optical lens provided by the application has good optical performance and meets the design requirements of large aperture, wide angle and ultra-thin.

The application relates to the field of optical lenses, and discloses a camera optical lens which comprises five lenses in sequence from the object side to the image side, namely a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, and a fifth lens with negative refractive power; and the following relations are satisfied: 0.50 <= (R5+R6) / (R5-R6) <= 0.81; -4.00 <= (f2+f5) / f <= -2.50; 0.60 <= d9 / d8 <= 2.00; 2.80 <= R9 / R10 <= 6.00; -8.00 <= (R7+R8) / f <= -4.00. The camera optical lens provided by the application can meet the design requirements of large aperture, ultra-thinning, and wide-angle.

The application discloses a 4K thermal stable DVR optical imaging system, which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter, a protective glass and an image plane arranged in the direction from the object side to the image side. Through the reasonable use of the lenses with specific shapes and the definition of the optical power of each lens, the application realizes a large target surface design, the maximum target surface is greater than or equal to 9.56 mm, can match a 1 / 1.8 chip IMX728, a large aperture design F1.8, and can realize the recording and identification of objects on both sides of the road in a dark environment; the FOV is increased to 171 degrees, a large-angle picture can be shot, and the field of view is improved.

The application relates to the field of optical lenses and discloses a camera optical lens which comprises seven lenses in sequence from the object side to the image side, namely a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens, a fifth lens with positive refractive power, a sixth lens with negative refractive power and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central curvature radius of the object side of the seventh lens is R13, the central curvature radius of the image side of the seventh lens is R14, the on-axis thickness of the sixth lens is d11, the on-axis distance from the image side of the sixth lens to the object side of the seventh lens is d12, and the following relationships are met: -7.00<=f4 / f<=10.00; 0.70<=d11 / d12<=1.50; -10.00<=R13 / R14<=-1.00. The camera optical lens has good optical performance and meets the design requirements of large aperture, wide angle and ultra-thin.

The invention provides an optical lens, which comprises three 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 convex 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; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens meet the following conditions: 0.9 lt; iH / flt; and 1.35. The optical lens provided by the invention has one or more advantages of long focus, large aperture, large refractive index of lens material and the like.

The application relates to the field of optical lenses, and discloses a camera optical lens, which comprises five lenses in total, and the five lenses are sequentially arranged from the object side to the image side as follows: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power; wherein the camera optical lens satisfies the following relationship: 3.00<=f2 / f<=12.00; 1.10<=(R9+R10) / (R9-R10)<=1.90; 1.00<=d1 / d2<=4.00; and 2.00<=R6 / R5<=15.00. The camera optical lens provided by the application can meet the design requirements of large aperture, ultra-thin, and wide-angle.

Provided is an imaging optical system that is compatible with a large image sensor, and achieves both a large aperture ratio and good aberration correction in consideration of weight reduction of a focus lens that is mainly driven in focusing. An imaging optical system consists of, in order from an object side: a front group GrF having a positive refractive power; a first focus group GrFC1 having a negative refractive power; a second focus group GrFC2 having a negative refractive power; and a rear group GrR having a positive refractive power. During focusing from infinity to a short distance, the front group GrF and the rear group GrR are fixed with respect to an image surface, the first focus group GrFC1 moves to the image side. The second focus group GrFC2 moves to the object side, and specific conditional expressions are satisfied.

The application discloses a teleconverter lens, which 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, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens arranged in sequence along an optical axis from an object plane to an image plane, wherein the first lens and the second lens are cemented, the third lens and the fourth lens are cemented, the seventh lens and the eighth lens are cemented, the tenth lens and the eleventh lens are cemented, and the thirteenth lens and the fourteenth lens are cemented. The teleconverter lens provided by the embodiment of the application realizes multiple performances such as 3.36 times high magnification, F2.63 large aperture and distortion lower than 0.6% through the structural design of 15 lenses and the matching of the focal power of each lens, and meanwhile, the total length of the teleconverter lens is controlled within 105 mm, so that the telephoto experience with high performance and portability is provided for users.

To obtain an optical system having high optical performance by satisfactorily correcting various aberrations including chromatic aberration of magnification in spite of a wide angle and a large aperture ratio.SOLUTION: The optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power, and an interval between adjacent lens units changes during focusing and satisfies a predetermined condition.SELECTED DRAWING: Figure 1

The application discloses an optical lens, a camera module and a terminal device. The optical lens has six lenses with refractive power, and sequentially comprises, from the object side to the image side along the optical axis: a first lens with negative refractive power, the object side surface and the image side surface of which are convex and concave respectively at the near optical axis; a second lens with negative refractive power, the image side surface of which is concave at the near optical axis; a third lens with positive refractive power, the object side surface and the image side surface of which are both convex at the near optical axis; a fourth lens with positive refractive power, the object side surface and the image side surface of which are both convex at the near optical axis; a fifth lens with negative refractive power, the object side surface and the image side surface of which are both concave at the near optical axis; and a sixth lens with positive refractive power, the object side surface and the image side surface of which are both convex at the near optical axis. The optical lens satisfies the following relationship: 160°≤FOV≤190°; 1.8≤FNO≤2.2. The optical lens meets the requirements of miniaturization, large aperture and wide field of view.