11 results about "Flint glass" patented technology

The invention relates to a large-view-field continuous zooming optical system from visible light to a near-infrared band. The system is sequentially provided with a front fixing group with positive focal power, a zooming group with negative focal power, a compensation group with positive focal power, a rear fixing group with negative focal power and an image plane I in the light propagation direction; wherein the zoom group is composed of a meniscus lens with negative focal power and a doublet lens; and the compensation group consists of a meniscus lens with positive focal power, a meniscus lens with negative focal power and a doublet lens with positive focal power. According to the invention, two groups of doublet lenses in different forms are adopted, a negative lens in one group of doublet lenses is crown glass with low refractive index and high Abbe number, and a positive lens in one group of doublet lenses is flint glass with high refractive index and low Abbe number; and in the other group of glued lenses, the negative lens is flint glass with high refractive index and low Abbe number, the positive lens is crown glass with low refractive index and high Abbe number, and the two types of glued lenses effectively control high-order spherical aberration caused by a large view field, correct field curvature and suppress chromatic aberration caused by a wide spectral range.

The present invention discloses a 16mm fixed-focus optical system with a large aperture and ultra-low distortion, which is applied to the machine vision field of intelligent security. The key points of its technical solution are as follows: It includes lens one, lens two, a cemented lens, a diaphragm, lens three, lens four, and lens five, which are arranged in sequence from the object plane to the image plane and rotate around the optical axis; the technical effect is that it can better reduce the distortion generated by the large aperture, and thus better improve the imaging quality. The system retains the optical design symmetric before and after the diaphragm, but introduces a group of doublet lenses to replace the single lens placed in front of the diaphragm instead of the traditional structure placed behind the diaphragm. Its main function is to converge the focusing positions of the chief rays and marginal rays in each field of view, and a heavy flint glass is specially arranged near the image plane of the system to correct the image plane curvature, correcting the original optical distortion of 5%-10% to within 0.1%.

The application discloses a high-power pulse ultraviolet xenon lamp and a manufacturing process thereof. The electrode assembly of the high-power pulse ultraviolet xenon lamp is coated with an inner glass layer and an outer glass layer when being sealed. The outer glass layer is sealed with a high-purity flint glass tube, and the high-purity flint glass tube has higher airtightness. Meanwhile, the problem of uneven stress distribution of the high-purity flint glass tube when being sealed by using a traditional sealing method is solved, and the mechanical resistance and transmittance of the high-purity flint glass tube are ensured. The connecting rod in the electrode assembly improves the high-temperature and high-pressure stability of the lamp tube under inputted medium and high pulse voltage, prolongs the service life of the lamp tube, and obtains stable high-intensity ultraviolet light.

The present invention provides a head-mounted display comprising two display units. The angle between the two display units is greater than 0 degrees and less than 180 degrees. Each of the two display units comprises a display device, a condenser lens, and a prism. The condenser lens overlaps the display device. The prism overlaps the condenser lens and the display device. One of the condenser lens and the prism is made of flint glass, and the other of the condenser lens and the prism is made of crown glass.

A head mounted display including two display units is provided. An included angle between the two display units is greater than 0 degrees and less than 180 degrees. Each of the two display units includes a display device, a condenser lens and a prism. The condenser lens overlaps the display device. The prism overlaps the condenser lens and the display device. A material of one of the condenser lens and the prism includes flint glass, and a material of the other of the condenser lens and the prism includes crown glass.

The invention relates to the technical field of laser direct writing photoetching machines, and particularly discloses a double telecentric projection imaging lens and a laser direct writing photoetching machine, the double telecentric projection imaging lens comprises a first lens group, a second lens group and a diaphragm, the first lens group is located between an object space and the diaphragm, and the second lens group is located between the diaphragm and an image space; the first lens group comprises a plurality of lenses, and one lens is made of flint glass; the second lens group comprises a plurality of lenses, one lens is made of flint glass, and the lens close to the image space is a plane mirror. According to the double-telecentric projection imaging lens, only two lenses made of flint materials are used, the stability of the projection imaging lens is improved, meanwhile, the position of the focal plane is adjusted through the plane mirror, and internal electronic elements are protected.

The present invention relates to an optical device for projecting a light beam, the device being capable of interacting with a pixelated light source (4) comprising a plurality of selectively activatable emitting elements, characterized in that the optical device comprises, in sequence along the path of the light beam, a first optical unit, a pupil, and a second optical unit, the first optical unit comprising an output refractive interface located at a first distance (d1) from the pupil, the second optical unit comprising an input refractive interface located at a second distance (d2) from the pupil, the second distance (d2) being substantially the same as the first distance (d1), and the first unit comprising a converging lens, and the second unit comprising a double lens, one of the double lenses being made of flint glass and the other of the double lens being made of crown glass.

A method of producing flint glass using submerged combustion melting is disclosed. The method includes operating a submerged combustion melter such that combustion products are discharged from one or more submerged burners combusting a combustible gas mixture that comprises fuel and oxygen. An oxygen-to-fuel ratio of the combustible gas mixture ranges from stoichiometry to 30% excess oxygen relative to stoichiometry, a temperature of a glass melt in the submerged combustion melter is between 1200° C. and 1500° C., a residence time of the glass melt is maintained between 1 hour and 10 hours, and a specific throughput rate of molten glass discharged from the submerged combustion melter ranges from 2 tons per day per meter squared of cross-sectional area of the submerged combustion melter [tons / day / m2] to 25 tons / day / m2. A method of forming glass containers from the molten glass discharged from the melter is also disclosed.

The application discloses a zooming radiation-resistant lens, which comprises a first lens group, a second lens group and a third lens group arranged in sequence from an object side to an image side, and a lens structure member arranged outside the lens groups for fixing the lens groups and shielding the lens groups from light, wherein the three lens groups are respectively composed of a plurality of lens pieces with different double-side curved surface shapes, and the types of the lens pieces for composing the lens groups include but are not limited to heavy flint glass doped with a weight percentage of a tantalum element of λ1, heavy flint glass doped with a weight percentage of a titanium element of λ2, heavy crown glass doped with a weight percentage of a barium element of λ3 and heavy lanthanum flint glass doped with a weight percentage of a cerium element of λ4, so as to meet the requirements of refractive index and dispersion coefficient. 6 In the application, the radiation-resistant lens is designed by using the four kinds of radiation-resistant glasses, supports a dose rate (Co60) of 3000Gy / h, supports a total dose (Co60) of 1x10 6 Gy, and the light transmittance after radiation does not decrease by more than 50%.

This invention relates to a large field-of-view continuous zoom optical system from visible light to near-infrared bands. The system comprises, along the light propagation direction, a front fixed group with positive optical power, a zoom group with negative optical power, a compensation group with positive optical power, a rear fixed group with negative optical power, and image plane I. The zoom group consists of a meniscus lens with negative optical power and a cemented doublet lens; the compensation group consists of a meniscus lens with positive optical power, a meniscus lens with negative optical power, and a cemented doublet lens with positive optical power. This invention employs two sets of cemented doublet lenses of different types. In one set, the negative lens is made of crown glass with low refractive index and high Abbe number, and the positive lens is made of flint glass with high refractive index and low Abbe number. In the other set, the negative lens is made of flint glass with high refractive index and low Abbe number, and the positive lens is made of crown glass with low refractive index and high Abbe number. These two types of cemented doublet lenses effectively control higher-order spherical aberrations caused by the large field of view, correct field curvature, and suppress chromatic aberration caused by a wide spectral range.