45results about How to "Precise curvature" patented technology

A zoom lens has good optical performance, is compact, and has a high magnifying power, and is suitable for use in a video camera, a digital still camera, a cellular phone, or the like, and an image pickup apparatus employs the zoom lens. The zoom lens includes a first lens group fixed upon zooming and having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power, which are successively arranged in the order from the object side. At least the second lens group and the fourth lens group are moved for zooming.

A ceramic substrate having a defined curvature and a method of its manufacture are described. For this purpose at least two ceramic layers having different defined temperature coefficients of expansion are positioned on top of one another and are permanently bonded together. A curved ceramic substrate may be advantageously utilized in micro-hybrid technology, in multilayer ceramic technology, or in hybrid technology, e.g., as a membrane element of a piezoresistive pressure sensor element.

In an image forming optical system which includes in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, a refractive index for a d-line of a positive single lens having the largest refractive power among all lenses in the second lens group, is the smallest of a refractive index of lenses in the second lens group.

A zoom lens system having a negative first lens group and a positive second lens group, from an object side, and achieving zooming by varying a group-to-group distance. The second lens group includes a three-element cemented lens which is a set of three lens elements cemented together including, from the object side, a negative first lens, a positive second lens, and a negative third lens, and the three-element cemented lens fulfills conditional formulas 0.08<(rs2+rs1) / (rs2−rs1)<0.5, 27<v2-v1<40, 20<v2-v3<38 (rs1, rs2 represent the curvature radius of the sides of cemented surfaces of the three-element cemented lens on the object side and the image side respectively, and v1-3 represent the Abbe numbers of the first to third lenses of the three-element cemented lens).

The invention discloses a hot press forming equipment, which includes a frame, and is characterized in that: a heating and shaping device is arranged on the frame, and an upper workbench and a lower workbench are arranged in the heating and setting device, and the upper and lower workbenches are opposite to each other. An upper mold and a lower mold are respectively arranged on the surface; an upper movement mechanism and a lower movement mechanism are arranged on the frame, the upper movement mechanism runs through the heating and shaping device and is connected to the upper worktable by transmission, and the lower movement mechanism runs through the heating and shaping device and is connected by transmission. The lower workbench; the frame on the side of the lower workbench is provided with an auxiliary workbench, and the auxiliary workbench is composed of left and right parts; the lower part of the frame is provided with a controller, the controller is connected with a control panel, and on the control panel There are several buttons, ammeters and voltmeters. The invention has the advantages of simple structure, ingenious design, reasonable layout, convenient operation, shortened processing procedure, guarantees that the sheet is not deformed and out of shape, and realizes that multiple technological steps can be completed on the same operation platform.

The invention relates to a cable curvature calculation method and a detection device based on binocular stereo vision. The image of a to-be-detected cable is acquired; further, the direction of the cable is marked on the image; the depth map of the cable image is further acquired, and a cable 3D model is reconstructed; then, the direction of the cable is marked again on the image, and three-dimensional points of the cable model closest to the marked point on the cable direction curve are calculated; and finally, the curvature of the point on a new curve is calculated as the curvature of the point on the cable. Through three-dimensional reconstruction of the 3D model of the cable, the direction of the cable is further marked, the cable can be distinguished more effectively, the cable curvature can be calculated conveniently, and the curvature is more accurate.

The present invention provides automotive forward-looking system and method. According to an aspect of the present invention, there is provided an automotive forward-looking system including: a forward-looking sensor that has a field of view in a predetermined range of angle and monitors a forward area of a vehicle; a controller that calculates a turning angle of the forward-looking sensor by estimating the curvature of a curved road; and a sensor turning unit that turns the forward-looking sensor by being controlled to operate by the controller, in which the controller estimates the curvature of a curved road on the basis of a guardrail installed at a side of the curved road.