A semiconductor laser control method and apparatus includes a semiconductor laser, a semiconductor laser control circuit, a drive current measuring unit, a detection unit, a warning unit, and a memory unit. The memory unit stores initial drive current values and corresponding temperatures. The detection unit performs a step of comparing an actual drive current value measured by the drive current measuring unit with the initial drive current value corresponding to an actual temperature. The warning unit performing a step of generating an alarm predicting the expiration of service life of the semiconductor laser, when the actual drive current value exceeds the corresponding initial drive current value by a specified percentage. Consequently, the near expiration of the service life of the semiconductor laser can be confirmed and therefore render the operational effects such as replacement of the semiconductor laser, without causing any hindrance to the operation.

Method and apparatus for extending and confirming the service life of semiconductor laser of bar code reader by detecting current increase corresponding to temperature of semiconductor laser

A laser beam machine for carrying out a machining operation by converging a laser beam emitted from a laser resonator and irradiating the converged laser beam onto a workpiece A beam interceptor (21) is arranged across a light path extending from a total reflection mirror (2) of the laser resonator (1) to a surface of the workpiece (5) and has a small inertia, and the position thereof is controlled at a high speed to permit the passage of the laser beam and to intercept the laser beam The beam interceptor (21) is controlled in such a manner that the laser beam is allowed to pass during a full-scale discharge and is intercepted during a seed discharge Accordingly, even if a seed discharge exists while a high-reflectivity material, for example, is machined, a laser oscillation of a composite resonator including the workpiece (5) can be reliably prevented

Laser beam machine

A laser machining apparatus adapted to carry out a cutting process by applying a laser beam to a work. During the cutting of a work with a laser beam applied thereto, a corner portion is cut stably and reliably under actually effective machining conditions. The machining route (path) according to a program which is being executed currently is judged for its conformity with a corner portion, i.e. a point B (step S1), and, if it conforms, a cutting operation is carried out in a stepped manner in accordance with a machining condition M stored in a RAM 3 in advance (step S2). When the machining condition has reached the corner portion, i.e. the point B, it is set to a lower level or a level of zero, and then increased in a stepped manner up to normal machining conditions Mo with the machining position (time). When the cutting operation at the corner portion in the point B is completed, a normal cutting operation is carried out under the constant machining condition Mo (step S3). Accordingly, the cutting of the corner portion in the point B can be done stably and reliably under actually effective machining conditions.

Laser machining apparatus

In a line tracing laser cutter for sheet material the fundamental axis of beam projection onto the work material is moved by relatively high inertia drive apparatus along a relatively smooth axis trace line, and during such movement the beam is at times shifted by low inertia apparatus from the fundamental axis to cause the beam to follow a line of cut having sharper or more complex features than the axis trace line.

Laser cutter and method for cutting sheet material

A laser beam machine executes a cutting operation by irradiating a laser beam onto a workpiece. The cutting operation of nonferrous metals having a considerable thickness is executed effectively and stably. A piercing operation is executed at point A under machining condition A, forming an arc-shaped portion. Then, the machining condition A is changed to machining condition B to execute an enlargement processing, and the arc-shaped portion is extended as it is, forming an enlarged cutting groove. After the enlargement processing is completed at point B, the standoff (or distance from the tip end of a machining nozzle to the surface of the workpiece) is set to as short a distance as possible, and the machining condition is modified to machining condition C. Thus, a cutting operation is started according to machining condition C. Therefore, the cutting operation is executed in substantially the same state as that in which a cutting operation is started directly from the outer-side end of the workpiece. In addition, in the case where the cutting operation is executed, the assist gas pressure is set to a high value, and the standoff is set to a low value, so that dross scattering effect by the assist gas appears more remarkably. Thus, the cutting operation is executed effectively and stably.

Laser beam machine for cutting a workpiece using multiple machine conditions

There is disclosed a method of correcting the laser beam output power of an NC laser beam cutting machine composed of a computerized numerical control (CNC) apparatus and a laser beam cutting machine. When a laser is initially energized, a correcting coefficient is determined from a laser beam output power command value and an actual laser beam output power by a correcting means (11), and the actual laser beam output power is measured at each periodic interval of time by an output measuring device (33). The NC laser beam cutting machine is controlled by a command control means (13) to eliminate the difference between the laser beam output power command value and the actual laser beam output power. When the laser is initially energized, a long-term variation in the laser beam output power is corrected, and when an actual cutting operation is carried out, a short-term variation in the laser beam output power is corrected, so that the laser output power can be produced accurately.

Method of correcting laser output power

PURPOSE:To obtain the accurate output of a laser even if it is changed by aging by a method wherein the actual output power is measured when the performance of the laser device starts to obtain a correction factor and an instructed value is corrected by the correction factor at the time of an actual processing. CONSTITUTION:An instructed laser power value is instructed when the performance of a laser device starts and, after the output of the laser device is stabilized, the laser output is measured by an output meter 33. A correction factor is calculated by a correcting means 11 and the obtained correction factor is stored by a memory in the correcting means 11. It is not necessary for an operator to take care of the work of obtaining the correction factor and the correction for the change by aging is carried out automatically. At the time of an actual processing, the product of the instructed value and the correction factor is used as the actual instructed value. With this constitution, the accurate laser output can be always obtained.

Laser output correction system

This invention relates to a method of producing a plate for a lead storage battery which comprises packing into an active material support a paste prepared by kneading a lead oxide having a minium content of up to 90% or a mixture of this lead oxide powder with lead power with water and sulfuric acid as the principal components. Since the lead oxide powder having a minium content of up to 90% is used, minium on the surface of this oxide and lead oxide in the particle core are directly bonded and bonding power between the active materials when kneading the paste is enhanced. The plate prepared by this method provides high adhesion of the paste to the active material support and high bonding power between the active materials. Therefore, the formation charge efficiency can be improved by minium and the service life when used in a battery can be improved.

Method of controlling power of cnc laser machine tool.

A system for correcting laser output of a CNC laser machining apparatus in which a numerical controller (CNC) and a laser machining apparatus are coupled together. Corrective means (11) determines correction coefficients for making an instruction value of the laser output coincide with the actual laser output when the laser is started. The practical output is measured by an output measuring device (33) at predetermined time intervals and is controlled by instruction control means (13) such that the difference becomes zero between the corrected instruction value and the practical laser output. Long-term variation in the output is corrected when the laser output rises and short-term variation is corrected during the practical machining operation, so that the laser output is properly produced.

System for correcting laser output

A system for correcting laser output of a CNC laser machining apparatus in which a numerical controller (CNC) and a laser machining apparatus are coupled together. Corrective means (11) determines correction coefficients for mak­ing an instruction value of the laser output coincide with the actual laser output when the laser is started. The practical out­put is measured by an output measuring device (33) at predetermined time intervals and is controlled by instruction con­trol means (13) such that the difference becomes zero between the corrected instruction value and the practical laser output. Long-term variation in the output is corrected when the laser output rises and short-term variation is corrected dur­ing the practical machining operation, so that the laser output is properly produced.

Mitsuo Kinoshita

Papers

Method of correcting laser output power

Laser output correction system

Method of controlling power of cnc laser machine tool.

System for correcting laser output

Method of correcting laser beam output power