Abstract: Provided is a welded joint comprising a plurality of steel sheets stacked together, and a spot weld having a nugget joining the plurality of steel sheets, and a pressure weld and heat affected zone formed around the nugget, wherein one or more of the plurality of steel sheets is a plated steel sheet comprising a base steel sheet and a plating layer formed on at least a surface corresponding to an outermost surface of the plurality of steel sheets of surfaces of the base steel sheet, the plating layer at a region outside of the heat affected zone has a predetermined chemical composition, when measuring the plating layer by GDS, a ratio of the “Al concentration at center of plating layer”/“Al concentration at position of plating layer where Fe concentration is 50% of base steel sheet” is 0.10 to 1.50, and an area ratio of a R-CuZn phase at the plating layer of a weld shoulder at the outermost surface of the plurality of steel sheets is 50% or less.

Abstract: An LED module includes a circuit board, multiple LEDs, and multiple electronic components for constituting a power supply circuit for lighting the multiple LEDs. The multiple LEDs are disposed on a first surface of the circuit board. The multiple electronic components are disposed on a second surface of the circuit board opposite to the first surface. At least some of the multiple electronic components are arranged so as to surround projections of the multiple LEDs projected onto the second surface of the circuit board in a thickness direction of the circuit board.

Abstract: An LED module includes a circuit board, multiple LEDs, and multiple electronic components for constituting a power supply circuit for lighting the multiple LEDs. The multiple LEDs are disposed on a first surface of the circuit board. The multiple electronic components are disposed on a second surface of the circuit board opposite to the first surface. At least some of the multiple electronic components are arranged so as to surround projections of the multiple LEDs projected onto the second surface of the circuit board in a thickness direction of the circuit board.

Abstract: An OLED driver possesses a square-wave voltage source, a controller and a detector. In accordance with first control, the source generates square-wave voltage and applies the voltage across at least one organic electroluminescence element to drive the element. The controller controls the source in accordance with the first control. The detector detects equivalent capacitance inherent in the element. The controller also judges whether or not the element is normal based on the equivalent capacitance. If the element is normal, the controller operates in accordance with the first control. If the element is not normal, the controller operates in accordance with predetermined second control for the element which is not normal.