摘要:
The invention provides a method for measuring in situ the amount of material removed by laser ablation with ultrashort laser pulses. The method relies on the geometrical information provided by the backscattered light from the ablating laser. The temporal structure of the backscattered laser light is used to provide an accurate measure for the depth of the ablated area, since the round-trip time for the short laser pulses uniquely determines the distance to the object under illumination. For femtosecond laser pulses a depth resolution of a few micrometers can be achieved. According to the invention, imaging of the backscattered light from a single ablating pulse provides all the information necessary to derive a cross-sectional profile across the ablated region.
摘要:
A tool for machining workpieces by motion of the machining tool relative to the workpiece has a support extending in the X-axis over a work support table and movable in the Y-axis. A machining tool housing is movable on the support in the Y-axis. A portion of the housing containing the machining tool is movable with respect to the mounted portion in the Y-axis within a limited range of motion. A computer control effects operation of drive motors to move the housing along the support and the support along the machining tool table to machine a workpiece supported on said worktable in X and Y axes, and the computer control can also effect operation of another drive motor to rapidly move of the housing portion and machining tool in the Y-axis when the desired length of motion in the Y-axis is within its range of motion.
摘要:
A method is for determining the accuracy of processing machines, in which the provision of test marks on a test object and the recording of the spatial position of the test marks are carried out at the same point in relation to the processing machine. Each test mark is provided as close as possible to a predetermined position, known as the relative setpoint position, the spatial position of which in relation to a reference mark is exactly known. The accuracy verification takes place by the relative position of the test mark provided in relation to a corresponding reference mark being recorded and consequently the relative actual position of the test mark being determined. The deviation between the relative setpoint position and the relative actual position is a measure of the accuracy of the processing machine. The measuring between the setpoint position and the actual position preferably takes place by an image acquisition device, which has a camera arranged on the processing machine. This allows the accuracy verification to be carried out directly by the processing machine.
摘要:
A method of forming at least one conductive path on a curved surface, such as on a helmet. The method includes aiming a beam of light to the curved surface, providing relative movement between the beam of light and the curved surface causing the beam of light to form a path on the curved surface, laying conductive material on the path, and possibly laying a protective overcoat on the path. The beam of light may be aimed using robotics, such as a robotic arm, to position and move a laser providing the beam of light. Instead of robotics, the method can include using a triaxial light beam source capable of focusing a beam of light in three dimensions. A computer controls the robotics, or the triaxial light beam source, to create and expose the paths.
摘要:
Laser beam positioners (300, 340) employ a steering mirror (236, 306) that performs small-angle deflection of a laser beam (270) to compensate for cross-axis (110) settling errors of a positioner stage (302). A two-axis mirror is preferred because either axis of the positioner stages may be used for performing work. In one embodiment, the steering mirror is used for error correction only without necessarily requiring coordination with the positioner stage position commands. A fast steering mirror employing a flexure mechanism and piezoelectric actuators to tip and tilt the mirror is preferred in semiconductor link processing (nullSLPnull) applications. This invention compensates for cross-axis settling time, resulting in increased SLP system throughput and accuracy while simplifying complexity of the positioner stages because the steering mirror corrections relax the positioner stage servo driving requirements.
摘要:
Laser beam radiating means has a center electrode at an inner periphery of an annular electrode. Center electrode potential control means controls potential of the center electrode so as to keep zero (0) or positive constant voltage, so that it is possible to absorb charged particles in plasma generating by radiation of laser beam through the center electrode, and dispersion of plasma can be restricted thereby. Even if a large volume of plasma is generated, a line of electric force from the annular electrode is not disturbed by plasma, and the variation of capacitance generating between the annular electrode and a workpiece can be prevented, thereby.
摘要:
An apparatus and method for perforating, cutting, or engraving a workpiece using a focused laser system to produce a focused laser. The apparatus includes a workpiece former having a complex shape to which the workpiece substantially conforms. The apparatus also includes a positioner that makes an adjustment to keep the focused laser substantially focused on the workpiece as the positional relationship between the workpiece former and the focused laser system changes to an operating position that changes the distance between the workpiece and the focused laser system due to the complex shape of the workpiece former.
摘要:
A laser scanning method and system for marking articles is provided wherein control is provided by a single central controller. The system includes a conveyor for conveying the articles in a first direction at a marking station. A conveyor controller controls the conveyor in response to conveyor control signals. A laser and an optical subsystem are optically coupled to the laser for generating a focused laser beam in response to laser control signals. A scan head includes a laser beam deflector for steering the focused laser beam along two substantially orthogonal intersecting axes at the marking station to mark a first predetermined region on at least one of the articles in response to deflection control signals. An actuator is coupled to at least part of the scan head for displacing the axes in a second direction substantially orthogonal to the first direction at the marking station in response to displacement control signals wherein the laser beam deflector steers the focused laser beam along the displaced axes to mark a second predetermined region on the at least one article. A central controller is provided for generating the deflection control signals, the laser control signals, the displacement control signals and the conveyor control signals in response to input data representing marking locations and marking content.
摘要:
A laser beam machining apparatus forms blind holes at predetermined intervals in a workpiece by intermittently irradiating a laser beam from a laser nozzle to the workpiece while the laser nozzle and the workpiece being moved relatively. During the time the workpiece is subjected to machining, the electrostatic capacity between the support member and the laser nozzle is detected by an electrostatic capacity sensor while the workpiece made of conductive material is supported on the support member. The irradiation output power is controlled by a control unit which operates to vary the number of output pulses from the laser nozzle each time one hole is formed according to the result detected in response to variation in the thickness of the workpiece.
摘要:
A focusing head for a laser machine, comprising: a base (16) rotating about a first axis and carrying a first mirror (20) designed to receive a laser beam along said first axis (A); a body (18) which can turn with respect to the base about a second axis (B) and which carries a second mirror (24) designed to receive the laser beam deflected by the first mirror (20) along the second axis (B) and to deflect said beam along a third axis (F); a focusing lens (46) which receives said laser beam along the third axis (F) and sends a focused laser beam towards a beam-exit nozzle (30); and means for varying the position of the aforesaid lens (46) along the aforesaid third axis (F) downstream of the rotation points about the aforesaid axes (A, B).