52 results about "Triplet lens" patented technology

A first group optical system having a positive refracting power, a second group optical system having a negative refracting power, and a third group optical system having a positive refracting power are sequentially arranged from an object side toward an image side. At least the first group optical system and the third group optical system move so that a distance between the first group optical system and the second group optical system becomes minimum at short focal-length side, and a distance between the second group optical system and the third group optical system becomes minimum at long focal-length side. The third group optical system includes a triplet lens formed with a negative lens, a positive lens, and a negative lens.

A lens system for collecting and focusing light emanating from an object has a cuvette housing the object and having a wall of thickness not greater than 1.5 millimeters; a plano-convex lens having a planar surface affixed to the wall; a sequence of at least three meniscus lenses, each meniscus lens having a concave surface toward the object and a convex surface, each successive meniscus lens receiving the light from the immediately preceding meniscus lens and having radii of curvature of its concave and convex surfaces greater than corresponding radii of the preceding meniscus lens; and at least one compound lens that may be a doublet lens or a triplet lens, the compound lens receiving the light from a last meniscus lens, wherein an image of a geometrical point on the object has a root-mean square spot size equal to or less than 63 μm.

The invention relates to a panchromatic objective lens of an aerial camera realizing wide angle as well as long and rear operating distance. The panchromatic objective lens adopts a reverse long-distance type structure, namely, a separation structure of a negative lens and a positive lens; a negative power lens group is used as a front group; a positive power lens group is used as a rear group; the front group consists of a first lens, a second lens and a third lens that are arranged sequentially; the rear group consists of a fourth lens, a five lens, a first pair of balsaming lens, a diaphragm, a triplet lens, a second pair of balsaming lens and a convex plane lens that are arranged sequentially; and components in each group of the front group and the rear group are sequentially arrangedalong an optical axis. The panchromatic objective lens of the aerial camera simultaneously realizes big field of view, long and rear operating distance, high resolution and low distortion.

The invention relates to a panchromatic objective lens of an aerial camera realizing wide angle as well as long and rear operating distance. The panchromatic objective lens adopts a reverse long-distance type structure, namely, a separation structure of a negative lens and a positive lens; a negative power lens group is used as a front group; a positive power lens group is used as a rear group; the front group consists of a first lens, a second lens and a third lens that are arranged sequentially; the rear group consists of a fourth lens, a five lens, a first pair of balsaming lens, a diaphragm, a triplet lens, a second pair of balsaming lens and a convex plane lens that are arranged sequentially; and components in each group of the front group and the rear group are sequentially arrangedalong an optical axis. The panchromatic objective lens of the aerial camera simultaneously realizes big field of view, long and rear operating distance, high resolution and low distortion.

A first group optical system having a positive refracting power, a second group optical system having a negative refracting power, and a third group optical system having a positive refracting power are sequentially arranged from an object side toward an image side. At least the first group optical system and the third group optical system move so that a distance between the first group optical system and the second group optical system becomes minimum at short focal-length side, and a distance between the second group optical system and the third group optical system becomes minimum at long focal-length side. The third group optical system includes a triplet lens formed with a negative lens, a positive lens, and a negative lens.

An electro-optic imaging system includes an aberrated triplet lens, a detector subsystem and a digital image processing subsystem. The triplet lens is not fully corrected for all aberrations (typically suffering from significant spherical aberration), with the digital image processing subsystem compensating for deficiencies in the triplet lens. In this way, an increased depth of field can be realized.

A lens system includes a first lens axially aligned with a second lens, where the first and second lenses are configured to be sequentially positioned from a pupil image of a viewer. The second lens is formed as a triplet having three cemented elements. The second lens includes a convex surface facing the first lens, and a flat surface opposing the convex surface of the second lens. The first lens includes a concave surface opposing a flat surface of the first lens; the second lens includes a concave surface and a convex surface; and the concave surface of the first lens and the concave and convex surfaces of the second lens have equal radii of curvatures.

The invention discloses an optical lens. 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 and a tenth lens are sequentially arranged on a common optic axis straight line from object space to image space, a diaphragm is arranged between the third lens and the fourth lens, and the fifth lens, the sixth lens and the seventh lens form a triplet lens for reducing chromatic aberration generated by confocal phenomenon of visible light and infrared light.

There is provided a zoom lens which includes, in an order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, and in which, during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and the zoom lens includes at least one cemented-triplet lens block having negative refractive power, in the fourth lens group.

The invention discloses a projection lens and a projection system, the projection lens comprises a refraction system and a reflection system, the refraction system comprises a front lens group, a middle lens group and a rear lens group, and the rear lens group comprises two doublet lens groups and a triplet lens group; the reflecting system comprises a reflecting mirror, the reflecting mirror comprises a first surface close to the front lens group and a second surface away from the front lens group, and the second surface is used for reflecting the imaging light of the refraction system. Two doublet lens groups and one triplet lens group are adopted to improve the chromatic aberration generated by different wavelengths, so that the spectrum of the projection lens can cover the range of 450-645 nm. The second surface of the reflector is adopted to reflect imaging light, so that the first surface and the second surface both participate in secondary imaging, the degree of freedom of the two surfaces is utilized to the greatest extent, the design difficulty of the two surfaces can be reduced, and the manufacturability of the reflection system is improved.

The invention discloses a microscope objective lens. The microscope objective lens comprises a first lens group having positive refraction focal power on the whole and a second lens group having negative refraction focal power on the whole which are sequentially arranged from the object side, wherein the first lens group is composed of a first doublet lens group, a third single lens, a fourth single lens, a second doublet lens group, a third doublet lens group and a first triplet lens group which are sequentially arranged from the object side; and the second lens group is composed of a secondtriplet lens group and a fifteenth single lens which are sequentially arranged from the object side. The numerical aperture can reach about 1.5 under a condition that the amplification factor of the microscope object lens is -100x and the image-side linear view field is 25mm through setting at least one of the third single lens and the fourth single lens to be a positive meniscus lens; the tolerance sensitivity of all lenses is reduced while the imaging quality is improved, and the qualified rate of the objective lens is improved; and a diffraction element in the combined lens is removed, so that the processing difficulty and the processing cost are reduced.

The present invention discloses a low-F-number full-HD (high definition) projection lens comprising a lens assembly arranged between a projection surface and a DMD chip. The lens assembly comprises afirst negative meniscus lens, a second negative meniscus lens, a biconcave lens, a first convex lens, a second convex lens, a triplet lens, a third convex lens and a fourth convex lens orderly arranged in a same optical axis from left to right. Projection signal light modulated by the DMD chip is projected into a full-HD projection lens, and the projection signal light sequentially passes throughthe fourth convex lens, the third convex lens, the triplet lens, the second convex lens, the first convex lens, the biconcave lens, the second negative meniscus lens and the first negative meniscus lens to be imaged on a projection screen. The structure is simple, with a lens with a similar structure of a retrofocus lens with negative lenses in the front and positive lenses in the back as an initial structure, the size of the chip is changed, the design is optimized through changing and increasing and decreasing glass materials and scaling a focal length, finally a low F number is realized, and the picture clarity is ensured.

A lens system for collecting and focusing light emanating from an object comprises: a cuvette housing the object and having a wall of thickness not greater than 1.5 millimeters; a plano-convex lens having a planar surface affixed to the wall; a sequence of at least three meniscus lenses, each meniscus lens having a concave surface toward the object and a convex surface, each successive meniscus lens receiving the light from the immediately preceding meniscus lens and having radii of curvature of its concave and convex surfaces greater than corresponding radii of the preceding meniscus lens; and at least one compound lens chosen from the group consisting of a doublet lens and a triplet lens, the compound lens receiving the light from a last meniscus lens, wherein an image of a geometrical point on the object has a root-mean square spot size equal to or less than 63 μm.

An infrared refractive lens triplet having color correction properties for radiation within the 3 to 12 micrometer spectral band for use with a quantum well detector for simultaneous dual band imagery. In certain embodiments of the invention, two widely spaced triplets form a Petzval-type objective lens. Each lens triplet is made up of a negative zinc sulfide lens, a positive zinc selenide lens, and a negative gallium arsenide lens coaxially positioned along a chief ray of the lens system.

An electro-optic imaging system includes an aberrated triplet lens, a detector subsystem and a digital image processing subsystem. The triplet lens is not fully corrected for all aberrations (typically suffering from significant spherical aberration), with the digital image processing subsystem compensating for deficiencies in the triplet lens. In this way, an increased depth of field can be realized.

A sunlight coupler is provided, the sunlight coupler may include a beam integrator configured to concentrate beams of sunlight, which may be incident from a plurality of optical fibers, in the form of a single beam, a triplet lens focusing the concentrated beam on a specific position, and an optical fiber provided for transmission of the focused sunlight. The optical fiber may be a thermally-diffusion expand core fiber.

The invention discloses a wide-spectrum flat-field apochromatic microscope objective. The wide-spectrum flat-field apochromatic microscope objective belongs to an infinity conjugate objective, and comprises a first part, a second part and a third part which are arranged in sequence, wherein the first part comprises cover glass, a first meniscus lens and a second meniscus lens which are arranged insequence, and the first part provides focal power and reduces numerical aperture for the following part; the second part comprises a first doublet lens, a second doublet lens, a third doublet lens and a triplet lens which are arranged in sequence, and the second part is used for correcting chromatic aberration; the third part comprises a fourth doublet lens, and is used for assisting in complementation of focal power and correcting field curvature. The wide-spectrum flat-field apochromatic microscope objective is large in numerical aperture compared to an objective with the same magnification, increases the brightness of fluorescence microscopy imaging, is wide in spectral range covering most of the visible light and part of the near-infrared light, and finally achieves apochromatism.

The present invention relates to a reflective type wide angle lens with large aperture (e. g., FNO 1.7) and low throw ratio (e. g., TR <= 0.2). The reflective type wide angle lens is capable of reducing the lens size and the number of lenses needed while focusing clearly on a wide range of screen sizes. The reflective type wide angle lens comprises a front lens group and a rear lens group. The front lens group comprises a first lens group and a second lens group. The rear lens group comprises a curved reflective mirror. The first lens group at least comprises a cemented triplet lens, an aspherical lens, and two spherical lenses. The second lens group at least comprises two aspherical lenses and two spherical lenses. The curved reflective mirror is an axially symmetrical concave asphericalreflective mirror.

A first lens group having a negative refractive power, an aperture diaphragm, and a second lens group having a positive refractive power are arranged in order from an enlargement side. A reduction side of a projection lens is made essentially telecentric. Further, cemented triplet lenses, each of which includes cemented three lenses, are provided in the first lens group and the second lens group, respectively. Further, air spacing which enables placement of a mirror is ensured between the first lens group and the second lens group. Moreover, specific conditional expressions for the lens are satisfied.

A near eye display system can include a first triplet lens arranged in a tile fashion and configured to be associated with a left eye. The near eye display system also can include a second triplet lens arranged in the tile fashion and configured to be associated with a right eye. A multiple display system can be paired with the first triplet lens and the second triplet lens.

The invention provides a vehicle lamp that is provided with a projection lens which has a high sharpness capable of clarifying the boundary of the illumination areas. Disclosed is a vehicle lamp including a projection lens (4) that projects light emitted from the light source. The projection lens is constituted by a triplet lens including a first lens (41) having a positive refractive power, a second lens (42) having a negative refractive power, and a third lens (43) having a positive refractive power, and a first inter-lens distance (t1) between the first lens (41) and the second lens (42), asecond inter-lens distance (t2) between the second lens (42) and the third lens (43), and a total lens thickness (T) of the projection lens 4 are in a relationship that satisfies 0.03<t1 / T<0.1 and 0.03<t2 / T<0.1.

An optical lens is used for receiving and projecting an image light beam and comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged from an amplification side to a reduction side, and an aperture arranged between the second lens group and the fourth lens group. When the optical lens is zoomed, the first lens group, the second lens group and the third lens group move relative to the light valve or the imaging surface of the optical lens, and the optical lens meets the following conditions: an image light beam firstly enters the fourth lens group, and the number of lenses with diopter is 9-16; a triplet lens and a doublet lens are arranged between the aperture and the lens closest to the reduction side. When the optical lens is a wide-angle end, the distance between lens surfaces with diopters on the outermost sides of the two ends of the optical lens along the optical axis of the optical lens is 85-110mm.

The invention relates to a large-relative-aperture 4K all-in-one machine optical zoom lens, which comprises a front fixed group, a zoom group, a diaphragm, a relay group and a compensation group; thefront fixed group comprises a doublet lens formed by tightly connecting a meniscus negative lens L1 and a meniscus positive lens L2, and a meniscus positive lens L3; the zoom group comprises a doubletlens formed by tightly connecting a biconcave negative lens L4, a biconcave negative lens L5 and a meniscus positive lens L6; the relay group comprises a triplet lens formed by connecting a biconvexpositive lens L7, a biconcave negative lens L8, a biconvex positive lens L9, a biconcave negative lens L10 and a biconvex positive lens L11 in a sealed manner, and a doublet lens formed by connectinga biconvex positive lens L12 and a biconcave negative lens L13 in a sealed manner; and the compensation group comprises a doublet lens formed by tightly connecting a biconvex positive lens L14, a biconcave negative lens L15 and a biconvex positive lens L16. The lens is compact in structure, can effectively correct chromatic aberration, is higher in resolution, and meets the MTF demands of a 4K-pixel high-resolution imaging chip.

The embodiment of the invention relates to the technical field of optics, in particular to a projection lens and a projector. The embodiment of the invention provides a projection lens and a projector. The projection lens comprises a first lens, a second lens, a third lens, a triplet lens, a fourth lens, a prism and a DMD chip which are sequentially arranged along an optical axis from an image side to an object side, wherein the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the triplet lens has positive focal power, the fourth lens has positive focal power, and the projection lens is small in size and can adapt to a small-size projection chip.

The invention relates to an optical zoom 4K adapter of a medical endoscope. The optical zoom 4K adapter comprises a plurality of lenses arranged along an optical axis between front window protective glass and a chip. The plurality of lenses are arranged between the front window protective glass and the chip along the optical axis in sequence as follows: the first negative lens, the first positivelens, the first triplet lens, the second positive lens and the second triplet lens. The first triple lens is a zoom group, and the first triple lens moves back and forth to achieve the zoom effect. The optical zoom adapter of the medical endoscope has the zoom effect that the focal length ranges from 16 mm to 32 mm, the entrance pupil diameter is 4 mm, a 4K resolution 1 / 2.5 inch chip is used, anddistortion is smaller than 0.3%. The adapter is an imaging objective lens which is simple in structure, and cost-controlled and optimized. Based on an optical imaging principle, optical design software is used for repeatedly carrying out structure optimization design on an imaging objective lens to achieve aberration.

The invention discloses an optical lens. 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 and a tenth lens are sequentially arranged on a common optic axis straight line from object space to image space, a diaphragm is arranged between the third lens and the fourth lens, and the fifth lens, the sixth lens and the seventh lens form a triplet lens for reducing chromatic aberration generated by confocal phenomenon of visible light and infrared light.

A sunlight coupler is provided, the sunlight coupler may include a beam integrator configured to concentrate beams of sunlight, which may be incident from a plurality of optical fibers, in the form of a single beam, a triplet lens focusing the concentrated beam on a specific position, and an optical fiber provided for transmission of the focused sunlight. The optical fiber may be a thermally-diffusion expand core fiber.