Abstract: A conventional laser processing method has a problem that the number of scanning lines is large, and it is difficult to shorten the time needed for the marking. In a laser processing method of the present invention, a first laser processing is performed in accordance with the outer border of, for example, an English letter “A,” and thereafter, second and subsequent laser processings are performed on an inner region inside the outer border. In this event, for the second and subsequent laser processings, the respective processing lines (scanning lines) are set up in a longitudinal direction of a processing region. Thus, the number of processing lines is greatly reduced. As a result, the time needed for the marking is greatly shortened, and the laser marking workability is improved.

Abstract: A conventional laser processing method has a problem that the number of scanning lines is large, and it is difficult to shorten the time needed for the marking. In a laser processing method of the present invention, a first laser processing is performed in accordance with the outer border of, for example, an English letter “A,” and thereafter, second and subsequent laser processings are performed on an inner region inside the outer border. In this event, for the second and subsequent laser processings, the respective processing lines (scanning lines) are set up in a longitudinal direction of a processing region. Thus, the number of processing lines is greatly reduced. As a result, the time needed for the marking is greatly shortened, and the laser marking workability is improved.

Abstract: In an ultrasonic imaging apparatus of the type having a plurality of selectable modes of operation, a motor-driven electroacoustic transducer is steered in a sector field in a predetermined relation to a selected operational mode. The sector scan format of returning echos is converted to a line-by-line raster display format in response to line sync pulses. The number of line sync pulses generated per unit time interval is scaled by a factor of N/M, so that it corresponds to the number of pulses generated by the encoder during the same time interval, where N and M are integers which are variable as a function of the selected mode. Phase comparison is made between the pulses generated by the encoder and the scaled line sync pulses to generate a phase difference signal from which a speed control signal is derived for controlling the speed of the motor.