Abstract: An object of the present invention is to obtain an update management system that makes it possible to perform writing and switching of a program in an ECU configuration having redundancy while a vehicle is traveling, even when the ECU configuration does not have a double-sided memory structure. An update management system of the present invention is mounted on a vehicle and includes: a plurality of arithmetic operation devices; and an update management device that controls the plurality of arithmetic operation devices. The plurality of arithmetic operation devices include at least a first arithmetic operation device and a second arithmetic operation device.

Abstract: To appropriately change an output of laser light without deteriorating laser characteristics. A control section of a laser machining device controls, when a target output is larger than a predetermined threshold, an output of laser light by changing a driving current supplied to an excitation light source and, on the other hand, controls, when the target output is equal to or smaller than the threshold, the output of the laser light by changing a duty ratio of a Q switch while keeping the driving current supplied to the excitation light source substantially fixed.

Abstract: To appropriately change an output of laser light without deteriorating laser characteristics. A control section of a laser machining device controls, when a target output is larger than a predetermined threshold, an output of laser light by changing a driving current supplied to an excitation light source and, on the other hand, controls, when the target output is equal to or smaller than the threshold, the output of the laser light by changing a duty ratio of a Q switch while keeping the driving current supplied to the excitation light source substantially fixed.