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

The invention discloses an optical imaging camera lens. The optical imaging camera lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along an optical axis in sequence from an object side to an image side. The first lens has positive focal power, wherein the object side face of the first lens is a convex face, andthe image side face of the first lens is a concave face. The second lens has negative focal power, wherein the image side face of the second lens is a concave face. The third lens has focal power, wherein the object side face of the third lens is a convex face, and the image side face of the third lens is a concave face. The fourth lens has focal power, the fifth lens has focal power, and the sixth lens has focal power. The seventh lens has positive focal power, wherein the object side face of the seventh lens is a convex face. The eighth lens has negative focal power, wherein the object sideface of the eighth lens is a concave face, and the image side face of the eighth lens is a concave face. The half length ImgH of the diagonal line of an effective pixel region on an imaging face of the optical imaging camera lens is larger than 5.80 mm, and the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging camera lens meet the conditionthat f7/f is larger than 1.00 and smaller than 2.00.

The application discloses an optical imaging lens. The optical imaging lens comprises a first optical lens with focal power; a second optical lens with positive optical power; a third lens with negative optical power; a fourth optical lens with optical power; a fifth optical lens with optical power; a sixth optical lens with optical power; a seventh lens with positive optical power; and an eighthlens with the negative optical power, wherein the first optical lens, the second optical lens, the third optical lens, the fourth optical lens, the fifth optical lens, the sixth optical lens, the seventh optical lens and the eight optical lens are arranged in order from an object side to an image side along an optical axis; the total effective focal length f of the optical imaging lens and the maximum field angle FOV of the optical imaging lens satisfy a formula that fxTAN (FOV/2) is more 4.0mm, and a total effective focal length f of the optical imaging lens, a center thickness CT7 of the seventh optical lens on the optical axis, and the center thickness CT8 of the eighth optical lens on the optical axis satisfy the formula that f/(CT7+ CT8) is not less than 5.0.

The present application discloses an optical imaging lens. The optical imaging lens includes, in an order from an object side to an image side along an optical axis: a first lens having optical power;a second lens having optical power; a third lens having negative optical power; a fourth lens having optical power and whose object side is convex; a fifth lens having optical power and whose objectside is concave; a sixth lens having optical power; a seventh lens having optical power; and an eighth lens having optical power. The total effective focal length f of the optical imaging lens and themaximum half angle of view of the optical imaging lens Semi-FOV meet: fxtan(Semi-FOV)>5.5mm, and the total effective focal length f of the optical imaging lens and the effective focal length f1 of the first lens meet: 0.5<f/f1<1.5.

The invention relates to an orthodontic bracket indirect bonding precise positioning system and an application method. The orthodontic bracket indirect bonding precise positioning system comprises a local positioning tray (1), a rear right tooth transfer arch-shaped rod (2), a rear left tooth transfer arch-shaped rod (3) and a front tooth transfer arch-shaped rod (7). The local positioning tray (1) comprises a first single side positioning local tray body (10) and a second single side positioning local tray body (11) which are symmetrically arranged, and a detachable spring ejecting rod (12) is installed between the first single side positioning local tray body (10) and the second single side positioning local tray body (11). By means of the orthodontic bracket indirect bonding precise positioning system and the application method, a bracket can be more precisely arranged; the bonding time is shortened; a patient feels more comfortable, and an upper bracket for intraoral teeth can be easily and quickly bonded clinically. In addition, healthier human engineering is achieved through indirect bonding, three-dimensional control over the teeth can be conveniently achieved, facial form improvement can be better achieved, and a good correction effect can be obtained.

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 relates to the technical field of ultra-precision machining of semiconductors, in particular to a rapid environment-friendly double-sided polishing method for a silicon wafer substrate. The rapid environment-friendly double-sided polishing method for a silicon wafer substrate comprises the following steps: (1) rough polishing: carrying out chemical mechanical polishing on a silicon wafer substrate by using a rough polishing solution, wherein the rough polishing solution is prepared from cerium oxide, deionized water, a dispersing agent and a pH adjusting agent; (2) fine polishing: carrying out chemical mechanical polishing on the silicon wafer substrate subjected to rough polishing by using a fine polishing solution, wherein the fine polishing solution is prepared from cerium oxide, deionized water and a dispersing agent. According to the polishing method, a two-step chemical mechanical polishing method is adopted, cerium oxide polishing solutions with different particle sizes, different polishing pads and different pH conditions are adopted, the pressure of a polishing disc and the rotation speed ratio of a center gear are controlled, the polishing efficiency of the silicon wafer substrate can be effectively improved, the average thickness difference of the polished substrate is small, and the bending warping degree is low.

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, which sequentially comprises a first lens with negative focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens having focal power, and a sixth lens having focal power from an object side to an image side along an optical axis. The object side surface and the image side surface of the first lens are a concave surface. The image side surface of the fifth lens is a convex surface. The maximum field angle FOV of the optical imaging lens is greater than 100 degrees and less than 140 degrees. The absolute value of TV distortion TVD of the optical imaging lens is less than 1.1%. The half ImgH of the diagonal line length of an effective pixel area on the imaging surface of the optical imaging lens and the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis meet the condition that ImgH/TTL is larger than 0.3 and smaller than 1.3.

The invention discloses an aspheric diffraction type contact lens which is used for correcting myopia and presbyopia and has a certain eye regulation function. The diameter of the optical part of the contact lens is 6 mm, the front surface of the contact lens is an axial symmetry type convex aspheric surface, and a diffraction ring used for providing additional diopter is arranged on the front surface. The rear surface of the contact lens is attached to the cornea of people, and the radius of curvature is consistent with that of the anterior corneal surface. After the contact lens is put on, clear imaging can be achieved within the range from medium-range distance to long-range distance (450 mm-infinite distance) and near the read range (240 mm-260 mm) in a field of view which is +/-4 degrees. Furthermore, the contact lens also has the advantages that the extended depth of field is large, and vision stays stable along with pupil change.

The invention relates to a preparation method of a polishing disc for polishing a superhard substrate slice and a precise polishing method, and belongs to a substrate machining technology. According to the novel preparation method of the polishing disc for polishing the substrate slice, the multi-layer composite polishing disc is used for precisely polishing the substrate slice, compared with a traditional substrate slice polishing technology, the technological process is greatly simplified, the polished substrate slice with the good surface type is obtained, and the polished substrate slice is small in average thickness difference and low in bending warping degree. The method is simple in process and easy to operate.

The embodiment of the invention discloses a bony class-II malformation correction method which comprises the following steps: quickly aligning teeth by adopting a multi-effect nickel-titanium arch wire, adducting anterior teeth by utilizing an anchorage nail and a constant-force tension spring, distally erecting upper posterior teeth, leveling a lower jaw spee curve, rotating a mandible anticlockwise, stretching a mandible chin forwards, reducing the heights of the upper posterior teeth and the lower posterior teeth, and promoting the mandible to rotate anticlockwise. And the lower anterior teeth are erected on the basal bone and are simultaneously depressed. In the later treatment period, when the upper anterior teeth reach the standard position, the lower mandibular anterior teeth are fully erected in the basal bone, but the anterior teeth cover a large area, a TMA wire is used for bending and raising in cooperation with oblique guiding and (or) the lower mandibular to conduct short-distance II-type traction, a rear tooth occlusion relation is established, the lower mandibular bone is promoted to move forwards, and the face of a II-type patient is improved. According to the invention, complicated operations such as operations are not needed, the orthopedic II-type correction of adults can be completed, and the facial forms of maxillary protrusion and mandibular retrograde can be effectively improved.

The invention discloses an optical imaging lens which sequentially comprises, from an object side to an image side along an optical axis, a first lens having focal power; a second lens having focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens having focal power; a fourth lens having focal power; a fifth lens having negative focal power; a sixth lens having focal power; and a seventh lens having focal power. The effective focal length f of the optical imaging lens and the entrance pupil diameter (EPD) of the optical imaging lens meet the condition that f/EPD is less than 1.5. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis, the half ImgH of the diagonal length of an effective pixel area on the imaging surface and the half Semi-FOV of the maximum field angle of the optical imaging lens meet the following condition: TTL/(ImgH * TAN (Semi-FOV)) < 1.7.

The optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, a second lens; a third lens; the fourth lens has negative focal power; a fifth lens element; and a sixth lens. The distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens along the optical axis and half ImgH of the length of a diagonal line of an effective pixel area on the imaging surface meet TTL/ImgHlt; and 1.3. The aperture number Fno of the optical imaging lens meets the following formula: Fnolt; 1.8).

The invention relates to the field of optical elements, in particular to a method for improving white dots on the surface of a metal film, which comprises the following steps: cleaning a substrate by using absolute ethyl alcohol, diethyl ether and calcium carbonate; sequentially depositing a Cr bonding layer and a Cu reflecting layer on the substrate by using a plasma-assisted PVD (Physical Vapor Deposition) method; and depositing a SiO2 protective layer on the Cu reflecting layer. Firstly, a bonding layer is deposited, the bonding force between a substrate and a Cu or Al film is increased, and ion source bombardment is adopted during deposition of the Cu or Al film, so that protrusions of the metal film layer are flattened, the surface quality of the metal film layer is better, the number of white points is effectively reduced, and the reflectivity of the metal film layer is improved. And a layer of oxide hard protective film is plated outside the metal film, so that the hardness of the reflecting film is increased, and the reflecting film is ensured to pass an environmental test.