2 results about "Concentric electrode" patented technology

This invention discloses an optical lens device comprising: a liquid crystal material housed between two half-cell components; wherein one or more of the two half-cell components include a first concentric electrode pattern and a second concentric electrode pattern, the first concentric electrode pattern and the second concentric electrode pattern being electrically operable in parallel to at least switch the liquid crystal material to a first state and switch out of the first state; wherein the first state includes a cooperative refractive index distribution in adjacent first and second regions centered on an optical axis; wherein at least one of the two half-cell components includes at least one annular solid wall structure located in a reset region between a first edge of the first region and a second edge of the second region; and wherein the solid wall structure is positioned closer to the first region than to the second region; and when the liquid crystal material is in the first state, the refractive index of unpolarized light propagating in a direction perpendicular to the half-cell components is more closely matched with the liquid crystal material at the first edge of the first region than the liquid crystal material at the second edge of the second region.

Method for two-stage spot welding, comprising: Providing a stack of workpieces (10) containing a first steel workpiece (14, 14A) and a second steel workpiece (14, 14B), wherein the first steel workpiece (14, 14A) and the second steel workpiece (14, 14B) contain a coating (16); Touching the first steel workpiece (14, 14A) with a first concentric electrode (12, 12A) and touching the second steel workpiece (14, 14B) with a second concentric electrode (12, 12B), wherein the first concentric electrode (12, 12A) and the second concentric electrode (12, 12B) each have an outer diameter (OD), an inner diameter (ID) and a tip (24); Removing the coating (16) from the first steel workpiece (14, 14A) to form a first locally exposed section (28, 28A), and from the second steel workpiece (14, 14B) to form a second locally exposed section (28, 28B), by passing an electric current between the first concentric electrode (12, 12A) and the second concentric electrode (12, 12B) and through the workpiece stack (10), wherein the locally exposed sections (28, 28A, 28B) are formed in the shape of a concentric ring with outer diameter (OD) and inner diameter (ID) and are defined by an outer shoulder region (30) and an inner shoulder region (32); and Spot welding of the first steel workpiece (14, 14A) and the second steel workpiece (14, 14B) using a first welding electrode (36A) and a second welding electrode (36B), respectively, wherein the first welding electrode (36A) and the second welding electrode (36B) have a weld end face diameter that is larger than the inner diameter (ID) and smaller than the outer diameter (OD).