285results about How to "Increase chromatic aberration" patented technology

The invention discloses an ultra wide angle camera lens. The ultra wide angle lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from an object space to an image space, wherein the first lens, the second lens and the fourth lens have negative focal power, the third lens and the fifth lens have positive focal power, the fourth lens and the fifth lens are adhered together to form a cemented lens with the positive focal power, the condition that BFL (Back Focal Length) / EFL (Effective Focal Length) is not smaller than 2.4 is also satisfied, BFL is a distance from an outermost point at the image space of a fifth lens element of the ultra wide angle camera lens to an imaging plane, and EFL is a focal length value of the ultra wide angle camera lens. In the invention, the ultra wide angle camera lens remains a longer BFL under the condition that a TTL (Total Length of Lens) is kept so as to meet requirements for larger sizes of electronic elements and devices at the periphery of an image sensor during the design of a camera; and the lens elements and optical filters are further from the image sensor due to longer BFL, so that the requirement for the surface cleanliness of the respective lens elements and optical filters can be effectively reduced, and the camera is easier to assemble and produce.

The present invention provides a charged particle beam column that does not cause displacement of an image or degradation of a resolution of images when a charged particle beam is tilted at a large angle. In the charged particle beam column including an aberration corrector, a deflector is used to control the direction of incidence of the charged particle beam on a second condenser lens but the object point of a condenser lens is not shifted. Consequently, the converging charged particle beam is tilted at a large angle with respect to the surface of a specimen without the necessity of shifting the object point of an objective lens lying on the optical axis of the charged particle beam column. At this time, the aberration corrector prevents a shift of an image or degradation of a resolution derived from the tilt of the charged particle beam.

The present invention provides a charged particle beam column that does not cause displacement of an image or degradation of a resolution of images when a charged particle beam is tilted at a large angle. In the charged particle beam column including an aberration corrector, a deflector is used to control the direction of incidence of the charged particle beam on a second condenser lens but the object point of a condenser lens is not shifted. Consequently, the converging charged particle beam is tilted at a large angle with respect to the surface of a specimen without the necessity of shifting the object point of an objective lens lying on the optical axis of the charged particle beam column. At this time, the aberration corrector prevents a shift of an image or degradation of a resolution derived from the tilt of the charged particle beam.

A zoom lens comprises a plurality of lens units including a first lens unit disposed most adjacent to an enlargement side and having negative refractive power, wherein one or more lens units of the plurality of lens units are moved in the direction of the optical axis thereof during magnification change, and wherein the first lens unit includes a 1-1st lens unit comprising at least one lens of negative refractive power and moved during focusing and a 1-2nd lens unit having positive refractive power, and fixed during focusing.

The embodiment of the invention discloses a backlight module. The embodiment of the invention comprises a housing unit which is provided with at least one reflecting surface and forms an accommodating space in a surrounding manner, a light source arranged in the accommodating space, a light guide plate installed in the accommodating space, and a quantum dot enhancement film arranged one the light guide plate in an overlapping manner and located in the accommodating space. The light guide plate comprises a light ingoing edge facing to the light source and a surrounding edge being connected with the light ingoing edge and forming an edge of the light guide plate in a surrounding manner together with the light ingoing edge. A reflecting surface of the housing unit faces to the light guide plate to increase the passing number of light passing through the quantum dot enhancement film, sufficient correction light is inspired, and a chromatic aberration of an edge position of a display is thus improved.

A zoom lens system including, in order from an object side to an image side, a first lens unit of positive optical power, and a second lens unit of negative optical power, followed by a lens component having a lens unit, wherein at least one of the first lens unit and the second lens unit moves during zooming. One of the lens units of the zoom lens system includes a layer made of a material that satisfies the following conditions:11<νIT<270.2<θIT<0.4.Wherein νIT is an Abbe number of the layer, and θIT is a partial dispersion ratio for the g-spectral line and f-spectral line of the layer. The layer has an optical power of a sign opposite to that of the lens unit including the layer.

The invention provides a liquid crystal display and a driving method thereof. The driving method comprises a step of obtaining the first data signal of a first sub pixel corresponding to a current scanning line and a second data signal of the second sub pixel which is corresponding to the previous scanning line of the current scanning line, wherein the first sub pixel and the second pixel are driven by a same data line, a step of determining a compensation value according to the first data signal and a second data signal, a step of compensating the first data signal by using the compensation value, and a step of driving the first sub pixel according to the compensated first data signal. According to the liquid crystal display and the driving method provided by the invention, due to the setting of the compensation value, the compensation value is used to compensate the data signal of each sub pixel, thus the phenomenon of a color difference of the liquid crystal display caused by data signal deformation is improved, and the quality of the liquid crystal display is improved.

When a wavelength having the same value as a reference wavelength Al of a first laser light is set to a designed wavelength λ, a diffractive optical element has: an inner circular side irregular diffraction pattern portion, in which a plurality of irregular portions in which a height of a convex portion is set to approximately 1λ-fold of the designed wavelength λ with respect to a concave portion are repeated, being formed in an annular shape in an inner circular area having a predetermined diameter for the correction of a spherical aberration generated due to a difference in substrate thickness between first and second optical recording mediums centering on a central point through which an optical axis runs while gradually changing a pitch of the irregular portions in a radial direction toward the outer circular side; and an outer circular side tiered diffraction pattern portion which is intended to improve a chromatic aberration with respect to the first laser light by forming in an annular shape in an outer circular area outside the inner circular side irregular diffraction pattern portion a plurality of tiers by setting a height of each tier to approximately mλ-fold (where m is a natural number which does not include 0) of the designed wavelength λ or by setting the same while changing a value of m for each tier.

The invention discloses a material grain separation technology used after shelling shells during processing of buckwheat. The technology comprises the steps that 1, after the shells of the buckwheat are separated, a mixed material containing a small part of buckwheat husks, buckwheat grains and the buckwheat with the shells is screened through a vibration grading screen at first, oversize products on lower layer screen cloth enter a color sorter through an elevator and the colors of the oversize products are sorted and separated, color sorting is conducted three times sequentially, separated semi-finished buckwheat grains are screened and graded through the vibration grading screen, and high-quality finished buckwheat grains are obtained; 2, small-grain-type buckwheat with the colors being sorted for the first time and the second time is uniformly mixed with large-grain-type buckwheat intercepted by upper layer screen cloth, wherein the small-grain-type buckwheat and the large-grain-type buckwheat are provided with the shells, and after cooling-heating treatment is conducted, the buckwheat enters a huller in batches for secondary shelling; and 3, the final material grain separation rate reaches 99.9%, the secondary shelling rate reaches 95%, the purity of the buckwheat grains can reach 99.9%, the imperfect grain mass is 1% or less, impurities account for 0.10% or less, broken grains account for 1% or less, the surface of the buckwheat is bright and clean, and the buckwheat has obvious buckwheat fragrance. The purpose of large-scale material grain separation with high quality, high efficiency and high yield is achieved for the buckwheat grains with the shells being separated.

Disclosed is a wide-angle lens having a viewing angle of more than 130°. The wide angle lens has a front group, an aperture, and a rear group arranged in this order from an object side to an image side. The front group has a first lens as a negative lens, a second lens as a negative lens, and a third lens as a positive lens arranged from the object side to the image side. The rear group is a cemented lens having a positive power when two lenses are bonded to each other. The wide-angle lens constitutes an image forming system with the five lenses as a whole, the first lens and the second lens of the front group are aspherical lenses, and the third lens is a spherical lens.

The invention relates to a display panel driving method, a system and a display device. The method comprises the following steps: acquiring the grayscale value of a current sub pixel of a display panel, the horizontal coordinate value of the current sub pixel, the compensation gain value of each interval boundary line, the coordinate value of each interval boundary line, and the grayscale values of the sub pixels in the previous row of the display panel; querying in a grayscale query table according to the grayscale value of the current sub pixel of the display panel and the grayscale values of the sub pixels in the previous row, and calculating the grayscale change compensation value of the current sub pixel; judging an interval to which the current sub pixel belongs; getting the compensation value of the interval according to the compensation gain values of two boundary lines adjacent to the interval and the grayscale change compensation value of the current sub pixel; and finally, calculating the compensation value of the current sub pixel, and calculating the final compensation grayscale value of the current sub pixel according to the grayscale value of the current sub pixel and the compensation value of the current sub pixel. The chromatic aberration is improved and the optical taste of products is improved without increasing the cost.

The invention relates to optical glass and a preparation method thereof. The optical glass is prepared from the following components in percentage by weight: 10-21% of P2O5, 10-50% of Bi2O3, 0-50% ofNb2O5, 0-20% of TiO2, 0-12% of WO3, 0-6% of SiO2, 0-6% of B2O3, 0 -6% of Li2O, 0-4% of Na2O, 0-6% of K2O, 0-4% of Al2O3, 0-3% of ZrO2, 0-5% of CaO, 0-5% of ZnO, 0-30% of Ba0, 0-2% of MgO, 0-3% of SrOand 0-0.1% of Sb2O3. The optical glass has the advantages of being excellent in performance, high in refractive index, high in dispersion and capable of decreasing the number of lens, prisms and otheroptical elements used in an optical system, and therefore the requirements of light weight and miniaturization of the overall optical system are met.