Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Toshiki Koshimae

Toshiaki Watanabe

Takeshi Morimoto

Akihiro Suzuki

Masato Matsubara

Hitoshi Kidokoro

Hiroaki Kurokawa

Hiroshi Kurushima

Satoshi Nishida

Naoki Miyamoto

Yoshiyuki Ito

Kenji Kumamoto

Teruaki Fukuoka

Hiroki Muraoka

Masayuki Uematsu

Hiroshi Kino

Tomonori Mukae

Naoki Nishikawa

A laser processing machine includes a processing head having a sensor, and a control unit to which a signal from the sensor is inputted. The control unit determines, by the signal, whether a drive shaft for the processing head needs to be adjusted. When the drive shaft is a state of needing adjustment, the control unit informs a display unit that the drive shaft is in a state of needing adjustment, and adjusts the drive shaft for the processing head by comparing data of a signal from the sensor with prestored data obtained during normal operation, in a different process than a laser processing process.

Laser processing machine and system for shaft adjustment

Provided is an NC program generating device that generates an NC program used in laser machining, using a rapid traverse command that moves a relative position between a machining head and a workpiece at a first movement speed, and a linear interpolation movement command that moves the relative position at a second speed, while causing the relative position to trace the workpiece, the device comprising: a movement time calculation unit that calculates a first movement time of the relative position when using the rapid traverse command and a second movement time of the relative position when using the linear interpolation command, a movement method selection unit that selects the movement command corresponding to the shorter time of the first movement time and the second movement time, and an NC program generating unit that generates an NC program by setting the selected movement command between the machining points.

NC program generating device and NC program generating method

The laser machining apparatus includes a transmission fiber that transmits laser light emitted from a laser oscillator through the fiber, a machining head that emits the laser light, which is sent from the transmission fiber, vertically to a main surface of a machining object and sends reflected light, which is reflected coaxially with the laser light by the machining object, to the transmission fiber, a reflected light monitoring unit that detects a reflected light intensity of the reflected light sent from the transmission fiber, and a control device that controls the laser oscillator and the machining head, in which the control device includes a determining unit that, at a time when laser machining is started, determines whether the machining object corresponds to a machining condition or not in laser machining on the basis of the reflected light intensity.

Laser machining apparatus that monitors material thickness and type by reflected light intensity

A laser output control device controlling a laser oscillator includes: a switching section that switches, based on the basis of the size of a pulse width of a laser output command, a current command value used for controlling output of the laser light to either one of peak value control and average value control; a peak value command generating section generating a current command value for performing peak value control; and an average value command generating section generating a current command value for performing average value control; wherein an output value of the laser light measured by one measuring section is input to the peak value command generating section and the average value command generating section, and the current command value is generated such that the output value of the laser light becomes a value that corresponds to the laser output command.

Laser output control device, laser oscillator, and laser output control method

A power supply apparatus includes an inverter having output terminals; a first transformer that transforms AC output from the output terminals; a second transformer that is connected to the output terminals in parallel to the first transformer, arranged on an opposite side of the first transformer with respect to a straight line passing through a center of the output terminals and extending perpendicularly to a plane including the output terminals, and transforms AC power output from the output terminals; first conductive lines that connect the output terminals to both ends of the first transformer; and second conductive lines that connect the output terminals to both ends of the second transformer. An area of a first loop formed by the inverter, the first conductive lines, and the first transformer is equal to an area of a second loop formed by the inverter, the second conductive lines, and the second transformer.

Power supply apparatus

Included are: a circuit-specific printed circuit board to be a circuit board that generates a power supply voltage; a first diode that is connected in antiparallel with the transistor and is configured so as to be capable of passing a current through a path to circumvent the transistor; a second diode that is connected in series to the transistor and prevents a current flow through a parasitic diode formed on the transistor; a protection circuit that is connected in parallel with the second diode to protect the second diode from a high voltage breakdown, and is formed on a substrate different from the circuit-specific printed circuit board; and a cooling unit that is joined to the protection circuit outside the circuit-specific printed circuit board and cools the protection circuit.

A laser output power command determination value from a controller () is input to an upper limit current determination unit (), and an upper limit current value to be decided based on the laser output power command determination value is determined. Then, a second comparator () compares a command current value determined from the laser output power command determination value and a laser output power command determination value measured with a power monitor (), with an upper limit current value determined with a upper limit current determination unit (). The second comparator () determines a command current value when the upper limit current value is greater than the command current value and the upper limit current value when the command current value is greater than the upper limit current value, as a reference current value, by which reference current value a current to be supplied to pumping means is configured to be controlled. In such a configuration, an upper limit current value is determined according to a laser output power command determination value, whereby an increased current to be supplied to the pumping means, i.e., the increase of energy to be supplied to a laser oscillator apparatus is avoided, and an energy loss in the optical component is reduced, which prevents damage development from leading to the replacement of the component.

Laser oscillator apparatus and power supply apparatus therefor, and control method therefor

A laser generator includes a generation means for pumping by a pumping light source () a pumping medium () to generate a fundamental-wave laser beam, an output sensor () for measuring average output power or pulse energy of the fundamental-wave laser beam, a wavelength-conversion element (), arranged on an optical path for the fundamental-wave laser beam, for converting the fundamental-wave laser beam into its higher-harmonic-wave laser beam, and a controller () for memorizing a determination value set to a value lower than a breakage threshold for average output power or pulse energy of the laser beam converted by the wavelength-conversion element (), and for, when the measurement value becomes not lower than the determination value, controlling the output power of the fundamental-wave laser beam to be a value lower than the breakage threshold; thereby, the beam intensity through the wavelength-conversion element () never exceeds the breakage threshold, and thus breakage of the wavelength-conversion element () can be prevented.

Laser generator and method of controlling the same

Plural LDsare series-connected and pump a solid-state pumping medium. Each of bypass circuitsis connected in parallel to an associated one of the LDs. An operation of driving each of the bypass circuitsis controlled by a control circuit. A detection circuitis provided corresponding to each of the LDsand detects a short circuit failure and an open failure of each of the LDsaccording to a voltage developed thereacross or the like. The detection circuitand the control circuitare connected to and are controlled by an LD shortcircuit control circuit. In a case where a failure of the LD is detected by the detection circuit, the LD shortcircuit control unitdetermines the position of the failed LD to bypass electric current having flowed through the failed LD. Then, the control circuitsends a signal to a predetermined control circuitto thereby operate a predetermined bypass circuit. The LD shortcircuit control unitdetermines the position of the LD, which is to be turned off, according to the position of the failed LD to improve a pointing deviation in the solid-state medium. Then, the control unitsends a signal to the control circuitto turn off this LD. Thus, the control unitcauses a predetermined bypass circuitto operate thereby to turn off the predetermined LD.

Laser diode pumped solid-state laser oscillator and laser diode control method of the oscillator

A laser oscillator that, in accordance with a laser output instruction value or a current instruction value that is input, excites a laser medium and obtains a desired laser output comprises: reference waveform generation unit for employing the laser output instruction value or the current instruction value to generate a laser output waveform and a current waveform, which are references; a first comparison unit for obtaining, as a current monitor value, a current value used to excite the laser medium, and for comparing the current value with the current wave form generated by the reference wave form generation unit; and a second comparison unit for fetching, as a laser output monitor value, the value of a laser that is output by exciting the laser medium, and for comparing the value for the laser with the laser output waveform generated by the reference waveform generation unit, wherein an abnormality is detected.

Laser oscillator

According to the present invention, there is provided a solid-state laser diode comprising:

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Tokyo, Japan

Toshiki Koshimae