5 results about "Effective length" patented technology

A tire having a tread has at least one tread element with a multi-dimensional sipe formed in the tread element. The sipe has a width W, a depth Ds, and an effective length Le. The sipe has a first radially outermost portion with a constant effective length Le, a second transitional portion with a gradually increasing effective length Le, and a third radially innermost portion having a constant effective length Le greater than the effective length of the first portion.

The invention relates to a lens driving device and belongs to the technical field of micro-cameras. The lens driving device comprises a first magnetic yoke ring, an insulation sheet, a first spring piece, a gasket, a lens carrier, a coil, a group of magnets and a second spring piece, wherein the outer profile of the first magnetic yoke ring is rectangular or circular, the insulation sheet is matched with a magnetic yoke ring cavity, the first spring piece and the gasket are placed in the magnetic yoke ring cavity, the lens carrier is provided with a lens placing cavity, the lens carrier and the coil are placed in the magnetic yoke ring cavity, and the second spring piece is placed in magnetic yoke ring cavity and provided with a group of third spring wires. The lens driving device has the advantages that a good even distribution effect is showed by the magnetic lines of the magnetic field generated by the magnets, an electromagnetic induction force of the coil obtained in an effective length range is enabled to be enlarged significantly, so that good driving characteristics are reflected, power driving power consumption can be reduced, assembly efficiency can be improved, the phenomenon that foreign bodies in the cavity drop on a sensor surface of a camera from lens carrier mating holes is avoided, wherein the phenomenon is caused by impact and vibration, so that image quality is ensured, harsh requirements of a lens optical axis degree can be met, and electromagnetic radiation generated by the coil can be prevented from affecting surrounding components.

The invention relates to the technical field of spacecraft deorbiting, and discloses a spacecraft deorbiting electrodynamic tether, comprising an electrodynamic tether and a charging and degassing device, wherein the electrodynamic tether comprises a conductive wire and an elastic layer sleeved outside the conductive wire, and the charging and degassing device is connected with the electrodynamictether for charging and degassing into the elastic layer. The invention provides a spacecraft deorbiting electrodynamic tether, the elastic layer sleeved outside the conductive wire is inflated by aninflating/deflating device, so that the elastic layer becomes an air column with an internal air pressure and a certain stretching tension, thus, the electrodynamic rope becomes a rod with certain bending and torsional stiffness in space, which improves the stability of the electrodynamic rope in space, avoids the problem that the effective length of the rope decreases due to the backward folding,does not need to consider the disturbance of the axis direction of the rope, and makes the state control of the electrodynamic rope relatively simple. In addition, it is convenient to model, which makes the electrodynamic tether more convenient and concise in theoretical analysis and model operation.