Laser machine

A laser machine comprising:

• a machining head including a laser source that emits a laser beam, a mirror allowing reflection of the laser beam, while being rotatable about a rotary axis, and a lens that focuses the laser beam;
• a plurality of motors that are configured to move, relative to one another, the machining head and a machining target to be machined with the laser beam;
• and
• a motor configured to move the mirror in order to move an irradiation intended position of an emission optical axis in a curvilinear pattern or a linear pattern,
• wherein emission output from the laser source is based on a condition for emitting the laser beam such that the emission output is configured to be set at a first output value or at a second output value smaller than the first output value,
• the condition for emitting the laser beam is based on a rotation angle of the mirror and an absolute value of a composite speed so as to achieve a constant quantity of heat input per unit length, and successively in response to changes in the absolute value of the composite speed, the composite speed being obtained by combining a relative move speed at which the machining head is moved relative to the machining target and a tangential speed at which scanning with the emission optical axis proceeds in a curvilinear pattern,
• the emission output is set at the second output value or off at each portion where the absolute value of the composite speed is at a maximum at which the machining head is moved in a direction parallel to the scanning with the emission optical axis in the curvilinear pattern,
• the emission output is set at the second output value or off at each portion where the absolute value of the composite speed is at a minimum at which the machining head is moved in a direction antiparallel to the scanning with the emission optical axis in the curvilinear pattern, and
• the emission output is set at the first output value at each portion where the absolute value of the composite speed is at a midpoint between the maximum and the minimum at which the machining head is moved in a direction perpendicular to the scanning with the emission optical axis in the curvilinear pattern.