Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Asahi Kogaku Kogyo Kabushiki Kaisha

Masato Matsubara

Hitoshi Kidokoro

Akihiro Suzuki

Hiroshi Kurushima

Junichi Nishimae

Miki Kurosawa

Akihiro Otani

Tsukasa Fukushima

Akihiko Iwata

Masaki Kuzumoto

Yoshihito Imai

Kenji Yoshizawa

Takashi Yamamoto

Osamu Nagano

Koji Yasui

Toshiki Koshimae

Teiji Takahashi

Satoru Morisawa

Yushi Takenaka

Hidekazu Sawai

Atsushi Morita

Seiichi Mori

Satoshi Nishida

Takashi Kumagai

Masaaki Tanaka

Hiroyasu Iwabuki

Shingo Tsuda

Hiroshi Ikarashi

Hideyasu Machii

Shuji Wakaiki

Hideki Kimata

Kouichi Indou

Naoki Nishikawa

Yoshimichi Saito

A laser beam generation device includes power supply units, LD modules, a combiner, and a control device. The LD modules receive currents from the power supply units, and output laser beams. The combiner collects the laser beams and outputs one laser beam. The control device generates control signals such that power of the laser beam becomes a laser output setting value and such that the currents become current command values. Phases of pulses of the control signals are shifted from each other by 60 degrees.

Laser beam generation device and laser processing apparatus including the same

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 switching power supply device includes: a chopper circuit that adjusts a DC voltage input through a reactor to a desired DC voltage by performing an on/off operation of a switching element; an inverter circuit that converts an output of the chopper circuit into a desired AC voltage; a first capacitor that is provided on a side of the inverter circuit relative to the switching element; a second capacitor that is provided on a side of the inverter circuit relative to the switching element; and a resistor that is in a resonant loop formed by three constituent elements that are the first capacitor, the second capacitor, and a wiring inductance between the chopper circuit and the inverter circuit, where the resistor is connected in series to the second capacitor and inserted between the DC bus-bars.

Switching power supply device

The present invention provides a power device including a converter part () for converting an AC voltage to a DC voltage; an inverter part () for converting the DC voltage outputted from the converter part () to the AC voltage; and a transformer () having an inductance forming a series resonance circuit together with an electrostatic capacity of a load () to boost the AC voltage outputted from the inverter part (). In the power device, an inductance () is connected to the output part of the inverter part () in parallel with the transformer (). Thus, in a discharge partprovided in the load (), since when a discharge is not generated, a recovery current is not supplied to a circulating current diode in the inverter part (), or the quantity of the recovery current is reduced, the heat generation of the circulating current diode can be suppressed without increasing the number of elements of the circulating current diode.

Power device for supplying AC voltage to a load having a discharge part

A laser beam machine includes a controller for outputting command pulse sets according to control parameter settings for controlling laser pulse output power, a thinning-out circuit, into which the command pulse sets are inputted, for thinning out pulses of the command pulse sets, based on predetermined setting values, an electric power supplying unit for generating, in response to command pulse sets outputted from the thinning-out circuit, pulsed electric power supplied to a load, and a generator for pumping, so as to output a laser beam, a laser medium with which a discharging space is filled, by electric discharge generated by the pulsed electric power supplied from the electric power supplying unit. A pulse width thereof can be considerably varied at low cost with the heat generated by the increase of the switching number of the electric power supplying unit being prevented.

Laser machining apparatus and control method for the apparatus

A pressure of a laser gas in an enclosure () is detected by a gas pressure sensor (), and a pressure comparison circuit () determines whether the thus-detected pressure is normal or anomalous. An electric current output from an inverter () that drives a blower () to cause a laser gas to flow back, is detected by a current detection circuit (). A current comparison circuit () determines whether or not the output current is normal or anomalous. A result of a pressure comparison circuit () and a result of the current comparison circuit () are sent to an AND circuit () and performed AND processing. A result of the AND circuit (), a result of the current detection circuit (), and a result of the gas pressure sensor () are sent to a comparison operation section () in a controller (). A determination is made as to whether or not the blower is anomalous. When the blower is determined to be anomalous, a signal is output to an oscillator and a machine control section (), to thus stop the oscillator and the machine. Thereby, an anomaly in the blower () can be detected regardless of fluctuations in the pressure of the laser gas.

Gas laser oscillator and gas laser beam machine

When a working condition is set, if an operator sets the working condition, a control device () obtains an expected load factor of a laser oscillator () based on the set working condition, and displays the load factor as a working condition check bar () on a display device (). The operator adjusts the working condition so that a load factor of the laser oscillator () stays within a predetermined range while watching the working condition check bar () and determines an appropriate working condition. Therefore, it is possible to prevent excessive load from being applied to the laser oscillator () at the time of actual working.

Method of controlling working conditions of a laser working machine and a computer-readable storage medium

In a gas laser machining apparatus based on a pulse laser oscillation, a mis-pulse-preventing pulse, viz., a preparatory pulse component whose energy is below the threshold value of a laser oscillation, is located prior to a first pulse of discharging power pulses.

Gas laser machining apparatus

A wiring board is machined by providing a light shielding body for shielding a portion of a laser beam in a light path between a laser oscillator and a machining lens, irradiating the laser beam onto the light shielding body, and introducing a non-shielded portion of the laser beam having passed through the light shielding body to the machining lens.

Method for machining wiring board with laser beam and device for same

A laser power supply apparatus supplies AC power to a gas contained in a laser device by way of a pair of dielectric layers, without having to use a transformer to form a high-frequency discharge in a gas to excite the gas, to cause the laser device to radiate. The laser power supply apparatus includes an inverter having arms, each arm including high-speed semiconductor switches connected in series, for directly converting a DC high voltage from a DC power supply to a series of AC output pulses having a much higher AC voltage than the DC high voltage and supplied to the laser device by simultaneously turning on and off those high-speed semiconductor switches in each of the arms, and for furnishing the series of AC output pulses to the laser device at a pair of output terminals.

Switching power supply for gas laser

Method and device for machining a wiring board utilizing light shielding of a laser beam to select a machined tapering

A laser machining apparatus according to the present invention describes characteristics of a laser oscillator with a function including laser power, pulse frequency and duty ratio, computes a command for a power supply unit in a feed forward control section according to a command based on the function and on the power, duty ratio and frequency, computes a command for a power supply unit in the feedback control section from a power command value and a power measurement value from the power sensor, and inputs these command to the power supply unit. Also the laser machining apparatus detects changes in characteristics in the laser oscillator and corrects the function for characteristics of the laser oscillator.

Laser machining apparatus with feed forward and feedback control

A laser beam machining apparatus including an image-transfer optical system having a mask inserted in an optical path between a laser oscillator and a workpiece, and a lens for reducing and forming an image of the mask on a processing surface; a focusing optical system; a drive unit for selecting one of the image-transfer optical system and the focusing optical system; and a numerical controller for controlling the image-transfer optical system, the focusing optical system, and the drive unit, wherein one of the image-transfer optical system and the focusing optical system is selected in correspondence with the diameter and depth of a hole to be processed.

Growing community of inventors

Tokyo, Japan

Masato Matsubara