38results about How to "Improve facial shape" patented technology

The invention relates to a large-focal-depth artificial lens based on a residual accommodation force of human eyes. According to the invention, the large-focal-depth artificial lens is made of a polymethyl methacrylate (PMMA) material and can be used for replacing a natural crystalline lens for human eyes with presbyopia., thereby realizing presbyopia correction. The front surface and the rear surface of the artificial lens are biconvex aspheric surfaces in a peripheral symmetric mode; and the diopter is 22D. Moreover, the artificial lens comprise an optical part and a loop connected with the optical part; the diameter of the optical part is 4.55mm; and the support loop plays a role in fixing the artificial lens. An object distance range from 0 to 4D is selected to optimize the surface parameter of the artificial lens and obtain the structure of the large-focal-depth artificial lens; and then the optical performance of the artificial lens eye is analyzed and the large-focal-depth performance of the artificial lens is verified.

A high-precision aspheric-surface milling and grinding edge effect compensation method includes the steps that standard equation machining is performed on aspheric-surface workpiecs to be machined, a contourgraph is used for detecting the face types of the workpieces having been subjected to the standard equation machining, correction is performed with a detection report obtained through the contourgraph as a reference, corrected data are used for obtaining correcting tool paths, and adjustment is performed in the positive and negative direction of the X axis of a tool. The method effectively eliminates the effect phenomenon of a machined edge caused by errors of detection data, the face types of the workpieces become better and more reasonable, and indexes required by a technology are achieved.

Big coke focal sphere diffractive artificial lens, is an artificial lens for replacing presbyopia eye natural crystal and for rectifying presbyopia eye. The artificial lens is prepared from polymethyl methacrylate material. the front and back surfaces of the artificial lens are twin convex aspherical surfaces symmetrical along the axial direction, the degree of diopter is 22D, the diameter of the optics department is 4.6mm, the back surface has a diffraction ring providing additional light focal power. The artificial lens has large depth of focus performance, planting the artificial lens eye model, can form images clearly at successive distances of 400mm to 5000mm.

The invention discloses an optical imaging lens. The lens sequentially comprises, from the object side to the image side along an optical axis, a first lens withfocal power, a second lens with focal power, a third lens with negative focal power, a fourth lens with focal power and with the object side surface to be a convex surface, a fifth lens with focal power and with the object side surface to be a concave surface, a sixth lens with focal power, a seventh lens with focal power, and an eighth lens with focal power. The edge thickness ET7 of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis meet the condition that ET7 / CT7 is larger than 0.5 and smaller than 1.0.

A method for compensating for defects in high-precision aspheric milling and grinding, including processing the aspheric surface to be processed with a standard equation; using a profiler to detect the surface shape of the workpiece processed by the standard equation, and selecting the aspheric surface closest to the requirements of the drawing The radius value is used to adjust the positive and negative of the Y-axis direction of the tool; the profiler is used to detect the surface shape of the workpiece processed by the standard equation, and the detected deviation curve is observed to adjust the positive and negative of the X-axis direction of the tool; the present invention is effective Eliminate the center boss or overcut phenomenon caused by the error of the detection data, so that the surface shape of the workpiece becomes better and more reasonable, and meets the technical requirements.

The invention provides an adjustable pressure device used for polishing a heavy-calibre plane optical element, relating to a pressure device. The adjustable pressure device used for polishing the heavy-calibre plane optical element, provided by the invention, is used for regulating the pressure intensity born by a polishing surface of a workpiece when being processed, is capable of improving the polishing quality of the workpiece and controlling the removal rate of materials, and has simple and practical structure. The adjustable pressure device is provided with a mass block and a fixture flat plate, wherein the mass block is used as a pressure source; the fixture flat plate is provided with a fulcrum bar, a base and an adsorption base film, the fulcrum bar is used for loading the mass block, the lower part of the base is connected with the adsorption base film, a base body and a film are arranged on the adsorption base film, the base is adsorbed on the surface of the workpiece through the film of the adsorption base film to ensure that the whole device is fixed on the corresponding part of the workpiece.

The invention discloses an II type appliance with a personalized function as well as a manufacture method and an application of the II type appliance. The II type appliance with the personalized function comprises a maxillary outer side base 1, a maxillary tongue side base 2, an occlusal pad 3, a mandible outer side base 4 and a mandible tongue side base 5, wherein the maxillary outer side base 1 and the maxillary tongue side base 2 are integrally connected through the occlusal pad 3 to form an upper tooth space 6, and the mandible outer side base 4 and the mandible tongue side base 5 are integrally connected through the occlusal pad 3 to form a lower tooth space 7. The II type appliance with the personalized function can promote growth of mandible and inhibit growth of maxilla, and the purpose of preventive or interruptive correction of functional II type malocclusion or mild bony II type malocclusion is achieved; correction is completed under the condition that tooth extraction for subtrahend is not adopted, the conditions that the front section of the upper dental arch becomes narrower and the side face of the upper dental arch is more umbilicate can be avoided, reverse occlusion of anterior teeth can be corrected, space is regained, dentition is aligned, the face shape is improved, and the II type appliance with the personalized function has a good application prospect.

The invention relates to the field of optical materials, in particular to a quartz and a method for increasing the anti-laser damage performance of the quartz. The method for increasing the anti-laser damage performance of quartz comprises the following steps: depositing silicon dioxide on the quartz substrate after etching the quartz substrate; while depositing the silicon dioxide, depositing the deposited silicon dioxide Silicon is melted. It can completely remove smaller micro-cracks by etching, and at the same time, can completely expose larger micro-cracks and passivate the crack tip, which facilitates the filling and repair of micro-cracks in the subsequent cladding process. The fluidity of fused silica is then used to repair and fill the cracks, thereby improving the mechanical properties of fused silica and ultimately improving its laser damage resistance. At the same time, the large-area uniform deposition and cladding glass coating makes the entire surface of the fused silica have a better surface shape.

The present application discloses an optical imaging lens, which includes sequentially from the object side to the image side along the optical axis: a first lens with negative refractive power, whose object side is concave and the image side is concave; Two lenses; a third lens with optical power; a fourth lens with optical power; a fifth lens with optical power whose image side is convex; and a sixth lens with optical power. The maximum field of view FOV of the optical imaging lens satisfies: 100°<FOV<140°. The TV distortion TVD of the optical imaging lens satisfies: |TVD|<1.1%. The half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, ImgH, and the distance TTL from the object side of the first lens to the imaging surface along the optical axis satisfy: 0.3<ImgH / TTL<1.3.

The present application discloses an optical imaging lens, comprising in sequence from the object side to the image side along an optical axis: a first lens with optical power; a second lens with positive optical power; and a third lens with optical power; a fourth lens with negative power; a fifth lens with power; a sixth lens with positive power; and a seventh lens with power. The material of at least three lenses in the first lens to the fourth lens is plastic. The material of the fifth lens is glass, and the object side surface and the image side surface are spherical surfaces. The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<1.25.

The invention discloses an optical imaging lens. The optical imaging lens sequentially comprises, from an object side to an image side along an optical axis: a first lens having positive focal power; a second lens having negative focal power; a third lens having focal power; a fourth lens having focal power, the image side surface of the fourth lens being a convex surface; and a fifth lens having negative focal power, and the object side surface of the fifth lens being a concave surface; wherein the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens on the optical axis and the total effective focal length f of the optical imaging lens meet the condition that TTL / f is less than 1.1; and the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens meet the condition that f123 / f45 is more than -0.8 and less than -0.3.