880 results about "Negative refraction" patented technology

The zoom lens consists of, in order from the object side, a first lens group that has a negative refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. During zooming, in each lens group, distances between the adjacent groups in the direction of the optical axis are changed. The first lens group consists of, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power. The third lens group consists of a negative lens. During focusing, only the third lens group moves along the optical axis. The zoom lens satisfies predetermined conditional expressions.

An optical imaging system includes a first lens having a negative 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 positive refractive power; and a seventh lens having a negative refractive power. At least five of the lenses are made of a plastic material.

A laser radar receiving lens and a system thereof relate to the technical field of optical design. The laser radar receiving lens provided by the utility model comprises an aperture diaphragm, a first lens with positive refractive power, a second lens with negative refractive power and a third lens with positive refractive power which are sequentially arranged along an optical axis from an object side to an image side, and at least one of six surfaces of the first lens, the second lens and the third lens is an aspheric surface. According to the laser radar receiving lens obtained through the design, the aperture diaphragm is arranged in front of the sides, close to the object plane, of the first lens, the second lens and the third lens, light beam control outside the laser radar receiving lens is facilitated while the compactness of the overall size of the lens is guaranteed, and then the signal-to-noise ratio and the imaging quality of a system are improved.

To provide a zoo lens which has a large aperture ratio and a minimized total length, offers less shift in the center of gravity while zooming and focusing and quiet autofocusing, and is suitable for video shooting.SOLUTION: A zoom lens of the present invention consists of a first lens group G1 having negative refractive power, an intermediate lens group GM having positive refractive power as a whole, a rear lens group GR, and a final lens group GN arranged in order from the object side, the intermediate lens group GM consisting of three or more lens groups including a focusing lens group configured to move along an optical axis while focusing from infinity to a short distance, and the rear lens group consisting of one or more lens groups. When zooming from the wide-angle end to the telephoto end, distances between the lens groups change as the intermediate lens group GM moves toward the object side, increasing the distance between the intermediate lens group GM and the rear lens group GR. The first lens group G1 and the final lens gup GN are stationary while zooming and focusing.SELECTED DRAWING: Figure 1

The present invention relates to the field of optical lenses, and discloses an imaging optical lens, which includes a total of seven lenses, which are, from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, and satisfy the following relations: 0.95≦f1 / f≦1.25, 60.00≦v1≦82.00, -4.00≦R13 / R14≦-1.00, 1.50≦d4 / d6≦5.00. The photographic optical lens provided by the present invention has excellent optical performance and at the same time meets the design requirements for a large aperture, an ultra-thin shape, and an ultra-wide angle.

The invention discloses a camera shooting optical lens. The camera shooting optical lens is composed of a first prism with positive refraction power, a first lens with negative refraction power, a second lens with positive refraction power, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side. A reflecting surface is arranged between the object side surface and the image side surface of the first prism, the first lens, the second lens and the third lens form a first lens group, the fourth lens and the fifth lens form a second lens group, and the first lens group can be movably adjusted along the optical axis of the camera optical lens, so that the camera optical lens is switched between a first state and a second state. Wherein the focal length of the shooting optical lens in the first state is fA, the image height of the shooting optical lens is IH, and the following relational expression is satisfied: fA / IH is more than or equal to 4.00 and less than or equal to 5.50. The shooting optical lens can realize large-aperture periscopic design, and has good optical performance.

To prevent the occurrence of aberration fluctuations and offset aperture along with zooming in a small-size, light-weight zoom lens.SOLUTION: A zoom lens consists of: a front group comprising a positive first lens group, a negative second lens group, a negative third lens group, and a fourth lens group having positive or negative refractive power; and a rear group comprising an aperture stop and a plurality of lens groups. The first lens group and a fifth lens group on the most object side in the rear group do not move, and the second, third, and fourth lens groups move in zooming. The rear group includes a focus lens group that moves in focusing. The focal length fFw of the front group at the wide-angle end, and the focal length fw of the zoom lens at the wide-angle end satisfy the condition of -3≤fFw / fw<0.SELECTED DRAWING: Figure 1

An imaging lens system includes a first lens, a second lens, a third lens having negative refractive power, a fourth lens, a fifth lens, and a sixth lens, disposed in order from an object side in a direction of an imaging plane, wherein one or more of the first to sixth lenses has a refractive index of 1.8 or greater, and has a refractive index temperature coefficient (10−6 / ° C.) of 3 or greater.

An optical system for a vehicle disclosed in an embodiment of the invention includes a first lens, a second lens, a third lens, and a fourth lens disposed along an optical axis from an object side toward a sensor side, the first lens includes an object-side first surface and a sensor-side second surface on the optical axis, the second lens includes an object-side third surface and a sensor-side fourth surface, the third lens includes an object-side fifth surface and a sensor-side sixth surface, the fourth lens includes an object-side seventh surface and a sensor-side eighth surface, the first lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a negative refractive power, the first lens and the fourth lens include a plastic material, and the third lens comprises a glass material.

The present disclosure relates to the field of optical lens, and discloses a camera optical lens, including from an object side to an image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; and the following relational expressions are satisfied: −0.300≤Sin(A1.0out14)*R14 / f7≤0.003; 1.05≤(f1+f2+f3+f4) / (f5+f6+f7)≤2.30; −1.40≤Sin(A0.8out8)*R8 / f4≤0.10. The camera optical lens according to the present disclosure has excellent optical characteristics of sufficient aberration correction, large aperture, wide-angle, ultra-thin, diversified structural design, and high sensor matching, and is particularly suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of camera elements such as CCD, CMOS with high definition and a vehicle-mounted lens.

There are provided a subminiature optical system having a miniature size and capable of obtaining a narrow view angle using only five sheets of lenses, and a portable device having the same. The subminiature optical system includes a first lens convex toward the object side and having positive refractive power, a second lens concave toward an image side and having negative refractive power, a third lens convex toward the object side and having positive refractive power, a fourth lens concave toward the image plane and having negative refractive power, and a fifth lens convex toward the image plane and having negative or positive refractive power, sequentially from an object side.

An information handling system camera provides a 117 degree field of view with low distortion by capturing visual images through a lens having eight lens elements. The first lens element closest to the object, the third lens element and the sixth lens element each have a glass material, the remaining lens elements have a plastic material. The first two lens elements and the last lens element each have a negative refractive power and the remaining lens elements have a positive refractive power. Lens elements two and four through eight each have aspherical surfaces.

The disclosure provides a wide-angle lens, a camera module and a camera. The wide-angle lens sequentially includes a first group, a stop, a second group, a third group and a filter. The first group sequentially includes a first lens with a negative refractive power, a second lens with a negative refractive power, and a third lens with a refractive power. The first lens is a meniscus lens. The second lens has a concave image side surface. The second group sequentially includes a fourth lens with a positive refractive power and a fifth lens with a positive refractive power, an image side surface of the fourth lens and an image side surface of the fifth lens are both convex. The third group sequentially includes a cemented doublet and an eighth lens. The eighth lens is a bi-convex lens.

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which comprises a first lens with positive refraction power, a second lens with negative refraction power, a third lens with negative refraction power and a triangular prism with negative refraction power which are sequentially arranged from the object side to the image side. Wherein the axial distance from the object side surface of the first lens to the image side surface of the third lens is D, the optical total length of the camera shooting optical lens is TTL, the Abbe number of a glass lens of the camera shooting optical lens is vdi, the focal length of the camera shooting optical lens is f, the focal length of the first lens is f1, the axial thickness of the second lens is d3, and the axial thickness of the third lens is d5; the axial distance from the image side surface of the second lens to the object side surface of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, and the following relational expression is satisfied: 0.14 < = D / TTL < = 0.46; 40.00 < = vdi < = 82.00; 0.30 < = f1 / f < = 0.70; -32.08 < = f23 / (D3 + D4 + D5) < =-3.00; 1.40 < = (R5 + R6) / (R5-R6) < = 20.00.

To provide a zoom lens that has a high variable power ratio and high optical performance and is capable of incorporating an electrically-driven zoom function.SOLUTION: A zoom lens comprises, in order from an object side to an image side, a first lens group L1 having negative refractive power, a second lens group L2, an intermediate group LM having one or more lens groups, and a final lens group LN. The zoom lens is configured such that respective intervals between adjacent lens groups change during zooming. The first lens group L1 includes two or more lenses. The intermediate group LM includes a first intermediate lens group Lm1 and a second intermediate lens group Lm2 disposed adjacently to the image side of the first intermediate lens group Lm1. The first lens group L1 and the first intermediate lens group Lm1 are immobile during zooming. A distance on the optical axis from the surface apex of the lens surface on the most object side of the first lens group L1 to the surface apex of the lens surface on the most image side of the first lens group L1 or the like is appropriately set.SELECTED DRAWING: Figure 1

An optical imaging lens assembly. The optical imaging lens assembly includes a lens cone, and a lens group and a spacing element group, which are arranged in the lens cone. The lens group sequentially includes from an object side to an image side along an optical axis: a first lens with a negative refractive power, a second lens with a refractive power, a third lens with a refractive power, a fourth lens with a refractive power, a fifth lens with a refractive power and a sixth lens with a negative refractive power. Image-side surfaces of the second lens, the third lens and the fifth lens are all convex surfaces. An object-side and image-side surface of the fourth lens are both convex or concave surfaces. The spacing element group includes a first spacing element. The optical imaging lens assembly satisfies: −3.45<R1 / f<2.75 and 0.75<2×Yc11 / d1s<1.25.

An optical lens system for photographing, comprising four lens elements (E1, E2, E3, and E4), the four lens elements (E1, E2, E3, and E4) being, in order from an object side to an image side along an optical path, a first lens element (E1), a second lens element (E2), a third lens element (E3), and a fourth lens element (E4), each of the four lens elements (E1, E2, E3, and E4) having an object side surface facing the object side and an image side surface facing the image side; wherein the first lens element (E1) has a positive refractive index, the object side surface of the first lens element (E1) being convex in a paraxial region thereof, the second lens element (E2) having a positive refractive index, the object side surface of the second lens element (E2) being convex in a paraxial region thereof, the third lens element (E3) having a negative refractive index, the image side surface of the third lens element (E3) being concave in a paraxial region thereof, the image side surface of the fourth lens element (E4) being convex in a paraxial region thereof, and at least one surface of at least one lens element in the optical lens system for photographing has at least one inversion point (P); wherein an axial distance between the object side surface of the first lens element (E1) and the image side surface of the fourth lens element (E4) is TD, wherein an axial distance between the image side surface of the fourth lens element (E4) and an image surface (IMG) is BL, wherein a focal length of the second lens element (E2) is f2, wherein a focal length of the fourth lens element (E4) is f4, wherein a central thickness of the first lens element (E1) is CT1, wherein a central thickness of the second lens element (E2) is CT2, wherein a central thickness of the third lens element (E3) is CT3, wherein a radius of curvature of the object side surface of the first lens element (E1) is R1, wherein a radius of curvature of the object side surface of the third lens element (E3) is R5, and wherein the following conditions are met: 0.05 < TD / BL < 0.60 ; 0.05 < | f 2 / f 4 | < 1.50 ; 0.10 < ( CT 2 + CT 3 ) / CT 1 < 1.00 ; and − 4.50 < (R 1 − R 5 ) / (R 1 + R 5 ) < 0.25.

An imaging optical system includes, in order from an object side to an image side, a first lens group, a second lens group, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power, in which, when focusing from an infinite distance object to a close distance object, the first lens group remains stationary with respect to an image surface, the second lens group moves to the object side along an optical axis, the third lens group remains stationary with respect to the image surface, the fourth lens group moves to the object side along the optical axis, and the fifth lens group remains stationary with respect to the image surface, the imaging optical system includes an aperture diaphragm, and the imaging optical system satisfies a predetermined conditional expression.

The utility model relates to the technical field of refrigeration and storage, in particular to a silencer and a refrigerating and freezing device. The silencing device comprises a silencing body, heat dissipation through holes horizontally penetrating through the two opposite side walls are formed in the silencing body, and sound absorption holes are formed in the hole walls of the heat dissipation through holes. Noise elimination cavities which are formed around the heat dissipation through holes and communicate with the sound absorption holes are further formed in the noise elimination body, at least one noise elimination cavity is provided with a bent position, and the bent position is of a first arc-shaped structure. When airflow enters the silencing cavity, the risk that the airflow generates secondary noise at the bending position of the silencing cavity can be reduced. According to the utility model, the impedance matching problem can be essentially improved, so that the silencer not only has a wide negative refractive index frequency band, but also can be well matched with air impedance. According to the refrigerator, the problem that in the prior art, a silencer is poor in noise reduction effect on the compressor bin is solved, the sound quality of the refrigerator is improved, and therefore the purpose of improving user experience is achieved.

An optical system according to an embodiment of the present invention includes an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens which are sequentially arranged from an object side to an image side, wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power. Both the object-side and image-side surfaces of the fifth lens have an asymmetric circular shape.

An image capturing optical system includes seven lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The third lens element has negative refractive power. The object-side surface of the fifth lens element is concave in a paraxial region thereof. The sixth lens element has positive refractive power. The seventh lens element with negative refractive power has the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof and having at least one inflection point.

An optical system, a lens module, and an electronic device are provide. The optical system includes, in order from an object side to an image side along an optical axis, a first lens with a negative refractive power, a second lens with a positive refractive power, a third lens with a negative refractive power, a fourth lens with a refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power. An object-side surface of the fifth lens has at least one inflection point. At least one of an object-side surface and an image-side surface of the sixth lens has at least one inflection point. The optical system satisfies the following expression: −9<f4 / |f1|<3.5.

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

An optical imaging system includes a first lens having a negative refractive power, a convex object-side surface, and a concave image-side surface; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power and an image-side surface having an inflection point. The first to sixth lenses are sequentially disposed in ascending numerical order from an object side of the optical imaging system toward an imaging plane of the optical imaging system.

The present disclosure relates to the field of optical lenses, and discloses a camera optical lens sequentially including seven lenses from an object side to an image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; and the following relational expressions are satisfied:0.9≤d⁢11.5 / d⁢131.5≤1.7;⁢1.≤(d⁢31.5+d⁢51.5+d⁢71.5) / (d⁢91.5+d⁢111.5)≤1.8;⁢1.1≤d⁢1⁢31.5 / d⁢13≤2.0⁢0.The camera optical lens has excellent optical characteristics of good processibility, ultra-thin, and is particularly suitable for a mobile phone camera lens component and a WEB camera lens which are composed of camera elements such as CCD, CMOS with high definition and a vehicle-mounted lens.

This variable magnification optical system is configured to include, in order from an object side: a front group which includes at least one lens group having negative refractive power; and a rear group which includes a plurality of lens groups and has positive refractive power as a whole, and in which a lens group arranged closest to the object side among the plurality of lens groups is a rear-side first lens group having positive refractive power, wherein during variable magnification, a front-side first lens group arranged closest to the object side among the at least one lens group of the front group is fixed to an image surface, and an interval between adjacent lens groups changes, thereby satisfying the following conditional expression.　0.01<(-fGFw) / fGR1<0.83, where fGFw is the focal length of the front group at the wide-angle end, and fGR1 is the focal length of the rear-side first lens group.

The present disclosure relates to the field of optical lenses, and discloses a camera optical lens. The camera optical lens sequentially includes seven lenses from an object-side surface to an image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; and the following relational expressions are satisfied: 0.20≤H0.6r9 / IH≤0.30; 16.00≤f1 / H0.6r1*tan(semi-FOV)≤30.00; −6.00≤(H0.6r14 / d13)*(f7 / f)≤−3.00. The camera optical lens has excellent imaging performance, meets the design requirements of wide-angle, low sensitivity, good processability, miniaturization and sufficient correction of aberration, and is particularly suitable for a mobile phone camera lens assembly composed of camera elements such as CCD CMOS with high definition, a WEB camera lens assembly and a vehicle-mounted lens assembly.

To provide a compact, high-performance catadioptric optical system. [Solution] The optical system comprises, in order of light passage from the object side, a primary mirror section consisting of an aspherical concave mirror with its concave surface facing the object side, a secondary mirror section arranged on the object side of the primary mirror section and consisting of an aspherical convex mirror with its convex surface facing the image side, and a refractive system arranged on the image side of the secondary mirror section, the refractive system comprising a front group with positive refractive power and a rear group with negative refractive power separated by a maximum air gap, the refractive system comprising at least five lenses, where PG is the Petzval sum of the refractive system obtained by normalizing the focal length of each surface by the focal length of the entire system, and PM is the Petzval sum of the reflective system obtained by normalizing the focal length of each surface by the focal length of the entire system, 0.6<|PG / PM|<1.2…(1) If the refractive power of the refractive system is φG and the refractive power of the entire system is φ0, then 0.05<|φG / φ0|<1.5…(2) 7 <PM<20…(3) It is characterized by satisfying the conditions (1), (2), and (3).

A camera optical lens sequentially includes seven lenses: a first lens having negative refractive power, a second lens having negative refractive power, a third lens having refractive power, a fourth lens having positive refractive power, a fifth lens having positive refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power. Following relational expressions are satisfied: 1.50≤f4 / f5≤3.40; 0.90≤R5 / R6≤1.40; 170≤FOV / Fno≤200. The camera optical lens according to the present disclosure has excellent optical characteristics of sufficient aberration correction, large aperture, wide-angle and ultra-thinness, and is particularly suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of camera elements such as CCD, CMOS with high definition, and a vehicle-mounted lens.

The optical system disclosed in the embodiment includes first to seventh lenses disposed along an optical axis from an object side to a sensor side, the first lens has positive (+) refractive power on the optical axis, and the second lens has a negative (−) refractive power on the optical axis, the seventh lens has a negative (−) refractive power on the optical axis, an object-side surface of the first lens has a convex shape on the optical axis, a sensor-side surface of first lens is bonded to the second lens, a sensor-side surface of the seventh lens has a largest effective aperture among the first to seventh lenses, and a distance in the optical axis from an apex of the object-side surface of the first lens to an image surface of an image sensor is TTL, ½ of a maximum diagonal length of the image sensor is ImgH, a refractive index of the first lens is n1, a refractive index of the second lens is n2, and the following equations may satisfy: 0.4<TTL / ImgH<3 and 0.05<(n2)−(n1)<0.25