474 results about "Negative refraction" patented technology

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.

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 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.

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 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.

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.

This invention provides an optical glass, its preparation method, and an optical element. The optical glass contains the following components in molar percentage: B₂O₃: 5.0%–19.9%; SiO₂: 5.0%–28.0%; La₂O₃: 0.05%–11.5%; Gd₂O₃: 0%–10.0%; Y₂O₃: 3.6%–15.0%; ZnO: 22.5%–60.0%; the refractive index n of the optical glass is... d An Abbe number of υ is above 1.78. d The temperature coefficient of refractive index is 35-45. The optical glass of this invention has a large positive temperature coefficient of refractive index. When used in combination with optical glass having a negative temperature coefficient of refractive index, it can effectively correct temperature drift caused by rapid temperature changes or high-temperature environments, fix the focus, and maintain clear imaging. It is suitable for vehicle-mounted cameras or projectors, copiers, laser printers, and playback devices that generate a lot of heat during use.

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens sequentially arranged in order along an optical axis from an object side of the optical imaging system toward an imaging surface of the optical imaging system, wherein the first lens has a positive refractive power, the second lens has a negative refractive power, at least two lenses sequentially arranged along the optical axis among the first lens to the fourth lens have an Abbe number of less than 38, and TTL / (2×IMG HT)<0.660 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging surface, and IMG HT is one half of a diagonal length of the imaging surface.

An optical system according to an embodiment of the present invention includes first to fifth lens groups disposed along an optical axis, wherein the first lens group has positive (+) refractive power, the second lens group has negative (-) refractive power, the third lens group has positive (+) refractive power, the fourth lens group has negative (-) refractive power, the fifth lens group has positive (+) refractive power, the first lens group includes a prism lens, the first lens group, the second lens group, and the fifth lens group are fixed groups, and the third lens group and the fourth lens group are moving groups.

Optical lens assembly for photography comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has 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 negative refractive power, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the sixth lens element (E6) has a negative refractive power, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, the seventh lens element (E7) has a positive refractive power, the image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) has at least one inflection point (P);; where the radius of curvature of the object-side surface of the sixth lens element (E6) is R11, the radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), measured at a reference wavelength of the d-line, is TLd, the maximum image height of the optical lens assembly for photography is ImgH, the focal length of the optical lens assembly for photography, measured at the reference wavelength of the d-line, is fd, the central thickness of the first lens element (E1) is CT1, the central thickness of the third lens element (E3) is CT3, the central thickness of the seventh lens element (E7) is CT7, the axial distance between the second lens element (E2) and the third lens element (E3) is T23, and the following conditions are met: 0 < (R 11 + R 12 ) / ( R 11 − R 12 ) < 1.50 ; 4,00 < TLd / ImgH < 6,50 ; 6,00 < TLd / fd < 12,00 ; 0,10 < CT 1 / CT 7 < 0,80 ; und 0,60 < T 23 / CT 3 < 2,00.

The present invention discloses a camera optical lens with seven-piece lenses including, 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 negative refractive power, a sixth lens having a positive refractive power and a seventh lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 20.00≤R7 / d7≤40.00, −20.00≤R13 / d13≤−5.00, and 4.00≤d1 / d2≤15.00. The camera optical lens according to the present invention has excellent optical characteristics, such as large aperture, wide-angle, and ultra-thin.

A camera optical lens includes 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 positive refractive power, and a fourth lens having negative refractive power; and following relational expressions are satisfied: 0.65≤f1 / f≤0.85; −1.50≤(f3−f4) / f2≤−0.80; 0.20≤(R3+R4) / f2≤0.80; 2.00≤d1 / d3≤7.00; and −3.50≤f234 / (d3+d5+d7)≤−2.50. The camera optical lens has excellent optical performance and is particularly suitable for a mobile phone camera lens assembly, and a WEB camera lens composed of camera elements such as CCD, CMOS for high pixels.

An optical imaging system includes a first lens having a 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 refractive power, and a sixth lens having a refractive power sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein the conditional conditions 0.85≤TTL / f≤1.0 and 0.5≤f1 / f≤1 are satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane, f is a total focal length of the optical imaging system, and f1 is a focal length of the first lens.

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.

A zoom lens comprises a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear lens group including one or more lens units. The first lens unit, the second lens unit, the rear lens group are arranged in order from an object side to an image side. Intervals between adjacent lens units change during zooming. The first lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end. The second lens unit includes three or more lenses. The zoom lens satisfies predetermined inequalities.

Proposed is a small lens system including a first lens, a second lens, a third lens, and a fourth lens arranged along an optical axis from an object. The iris diaphragm is located between the first lens and the second lens. The first lens has a negative refractive power and includes a surface concave surface on an object side and a convex surface on an image side. The second lens has a positive refractive power and includes convex surfaces on both sides. The third lens has a positive refractive power and includes convex surfaces on both sides. The fourth lens has a negative refractive power and includes concave surfaces on both sides. All surfaces of the first to fourth lenses are aspherical.

A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and two or more additional lens units. In zooming, the first lens unit moves, and an interval between adjacent lens units changes. The refractive index of a negative lens A disposed on a most object side of negative lenses included in the first lens unit is higher than or equal to 1.89, and the negative lens A and a lens B disposed adjacent to an image side of the negative lens A satisfy a predetermined relationship.

Optical lens assembly for photography comprising seven lens elements (E1, E2, E3, E4, E5, E6, E7), wherein the seven lens elements (E1, E2, E3, E4, E5, E6, E7) are arranged in sequence from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6) and a seventh lens element (E7), and wherein each of the seven lens elements (E1, E2, E3, E4, E5, E6, E7) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the object-side surface of the second lens element (E2) is convex in a paraxial region thereof, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the seventh lens element (E7) has a negative refractive power and the object-side surface of the seventh lens element (E7) is concave in a paraxial region thereof; wherein the optical lens assembly for photography further comprises an aperture diaphragm (ST) arranged between the second lens element (E2) and the third lens element (E3); where f is the focal length of the optical lens assembly for photography, f is the focal length of the third lens element (E3), f3 is the combined focal length of the first lens element (E1) and the second lens element (E2), f12 is the central thickness of the first lens element (E1), CT1 is the central thickness of the second lens element (E2), CT2 is the central thickness of the seventh lens element (E7), CT7 is the radius of curvature of the image-side surface of the sixth lens element (E6), R12 is the radius of curvature of the object-side surface of the seventh lens element (E7), and the following conditions are met: 3.20 < f / CT1 < 6.50 ; − 0.65 < R13 / | R12 | < 0 ; 0 < | f3 / f12 | < 0.45 ; and and 0 < CT7 / CT2 < 0.85.

An optical system disclosed in the embodiment of the invention includes a first lens to an eighth lenses which are sequentially arranged along an optical axis in a direction from the object side to the sensor side, wherein the first lens has a positive refractive power and has a convex object-side surface, the second lens has a negative refractive power and a concave sensor-side surface, at least one of an object-side and sensor-side surfaces of the sixth lens has an inflection point, the seventh lens has positive refractive power and has a convex sensor-side surface, the eighth lens has negative refractive power, and the object-side surface and the sensor-side surface of the eighth lens have at least one an inflection point, and a center thickness of the seventh lens may be the thickest among center thicknesses of the first to eighth lenses.

An electronic device includes: a lens assembly including at least five lenses aligned in an optical axis direction from an object side of the lens assembly to an image side of the lens assembly, a first lens from the object side has a negative refractive power, a second lens from the object side has a positive refractive power, and a first lens from the image side has a negative refractive power; and an image sensor including an imaging surface on which an image is formed.

The imaging lens includes, in order from an object side, a first lens group that has a refractive power, a second lens group that has a positive refractive power, and a third lens group that has a negative refractive power. During focusing, the second lens group moves. The second lens group includes a stop and at least three negative lenses. The imaging lens satisfies predetermined conditional expressions.

A zoom lens includes, in order from an object side to an image side, a first lens unit with negative refractive power, a second lens unit, one or more intermediate lens units, and a rear lens unit. At least the second lens unit and the one or more intermediate lens units move during zooming. Each distance between adjacent lens units changes. The one or more intermediate lens units include an N-th intermediate lens unit disposed closest to an image plane, and the N-th intermediate lens unit includes a shift unit with positive refractive power disposed closest to the image plane and movable in a direction orthogonal to an optical axis of the zoom lens.

This zoom optical system (ZL(1)) has a plurality of lens groups (G1-G7), wherein when during zooming, distances between adjacent lens groups vary. The plurality of lens groups include: a first focused lens group (G6) that moves during focusing; and a second focused lens group (G7) that is disposed closer to an image plane side than the first focused lens group and moves during focusing along a trajectory that is different from that of the first focused lens group. The first focused lens group (G6) and the second focused lens group (G7) both have a negative refractive power and satisfy the following conditional expression, 0.40<fF1 / fF2<6.00, where fF1: focal length of first focused lens group and fF2: focal length of second focused lens group.

To provide a zoom lens with a wide angle of view and good optical performance. [Solution] The zoom lens L0 is composed of a first lens group L1 with negative refractive power, an intermediate group LN with negative refractive power including at least one lens group, and a rear group LP with positive refractive power including multiple lens groups. When zooming, the first lens group does not move, but the distance between adjacent lens groups changes. The air distance between the intermediate group and the rear group is maximum at the wide-angle end. The intermediate group includes multiple negative lenses. When the focal length of the first lens group is fL1, the distance on the optical axis from the lens surface closest to the object in the intermediate group to the lens surface closest to the image in the intermediate group at the wide-angle end is DLNw, and the maximum amount of movement of the multiple lens groups included in the rear group when zooming from the wide-angle end to the telephoto end is MLP, the following conditions are satisfied: -5.0 ≤ DLNw / fL1 ≤ -0.7 and -5.0 ≤ MLP / fL1 ≤ -0.7.

A receiving optical system according to the present embodiment comprises first to sixth lenses sequentially arranged from an object side to a sensor side along the optical axis, wherein the first lens has negative (-) refractive power, at least one of the second to sixth lenses has positive (+) refractive power, and among the gaps between lenses adjacent to each other along the optical axis, the center gap between the second lens and the second lens is the greatest.

Provided is an optical system including three or four lenses having refractive power. Along an optical axis from an object side to an image side, the optical system sequentially includes a first lens having positive refractive power, a second lens having refractive power, and a third lens having refractive power. An object-side surface of the first lens is convex in a paraxial region. One of the second lens and the third lens has positive refractive power, and the other has negative refractive power. The optical system satisfies the following condition expressions: 0.25≤f1 / f≤0.85, and 0.15≤|f / f|≤1.25, where f1 is a focal length of the first lens, and f3 is a focal length of the third lens.

An optical system according to an embodiment of the present invention comprises first to third lens groups arranged along an optical axis, wherein the first lens group has positive (+) refractive power, the second lens group has positive (+) refractive power, the third lens group has negative (-) refractive power, the first lens group includes a prismatic lens, the first lens group and the second lens group are fixed groups, and the third lens group is a movable group.

A photographing lens assembly includes five 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 and a fifth lens element. Each of the five lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has positive refractive power. The third lens element has negative refractive power, the object-side surface of the third lens element is convex in a paraxial region thereof, and the image-side surface of the third lens element is concave in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one lens element of the photographing lens assembly is aspheric.