Matsushita Electric Industrial Co., Ltd.

Takeshi Masaki

Ryuichi Toyoda

Kimikatsu Sato

Koichi Kawata

Toshihiko Wada

Masahiro Muro

Yukuo Sakagaito

Masakazu Hiraishi

Takao Inoue

Hiroyuki Nakata

Yoshihiro Ikemoto

Katsumasa Yamaguchi

Yoshio Yamada

Hiroto Toba

Toru Nakagawa

Yoshinori Furusawa

Hiromichi Kinoshiro

Hirofumi Yasumoto

Akemi Shibuya

Taiziro Yosioka

Katsutoshi Yonemochi

Takeshi Mizutani

Katsutoshi Yonemaochi

Akemi Tanaka

An electrical discharge machining apparatus includes a work electrode adapted to support a work immersed in a working fluid, a tool electrode located opposing the work electrode with a predetermined gap therebetween, a capacitor that is connected between the work electrode and the tool electrode to provide a series of voltage pulses, a charging circuit having a power supply and a first switching element which are connected in series to the capacitor, a charge regulating circuit having a second switching element connected in series to the capacitor, and a control unit that controls the first and second switching elements, such that the first switching element turns on, and then the second switching element turns on before the first switching element turns off. Then, one voltage pulse, having a leading edge corresponding to the turning on of the first switching element and a trailing edge corresponding to the turning on of the second switching element, is generated.

Electrical discharge machine power supply

In a micro electro discharge machining method and apparatus, the shapes of minute holes are transferred to a tool electrode through a plate electrode serving as an intermediate electrode, and a workpiece is machined using the tool electrode. As a result, the time for machining is reduced. During the electro discharge machining process, the relative distance between the tool electrode and the plate electrode or the workpiece is changed at a prescribed frequency and discharge pulse output is controlled in synchronization with the change in the relative distance between the tool electrode and the plate electrode or the workpiece, so that high precision machining is enabled.

Micro electro discharge machining method and apparatus

An electrode discharge machining apparatus includes a first holder for holding a workpiece to be subjected to electro discharge machining, an electrode provided opposing the workpiece held by the first holder, a capacitor for supplying electric charge to the electrode and the workpiece so as to generate pulse electro discharge between the workpiece and the electrode, a power source for applying a voltage to the capacitor, a switching element provided between the capacitor, and at least one of the electrode, the workpiece and the power source, a switch controller for controlling on and off of the switching element, a current detecting element for detecting a current flowing between the workpiece and the electrode, and a control unit for, based on the current detected by the current detecting element, judging whether or not a short circuit occurs between the workpiece and the electrode. When it is judged that a short circuit occurs between the workpiece and the electrode, the switch controller switches off the switching element for a predetermined time. Use macro to add file identifier.

apparatus for electric discharge micromachining of a micro-diameter hole

A workpiece is held on a table and moved in X and Y directions relative to a tool electrode which is displaceable in a direction orthogonal to the X and Y directions. The position of the workpiece to which it should be moved is calculated based on the current positional data of the tool electrode relative to the workpiece and the machining data. The workpiece is moved continuously in X and Y directions to the thus obtained position in accordance with the shape being machined.

Electro discharge machining apparatus

A machining program is prepared based on design data obtained by CAD and machining conditions stored in advance in a data base, while machining status information is obtained from a machining site. Based on the machining program and the machining status information, a machining status is simulated in order to subsequently prepare machining commands required for appropriate NC control.

Method of and apparatus for finely machining a workpiece with numerical

In an electric discharge machine and machining method for processing an object through electric discharge by impressing a voltage between a processing electrode and the object, the processing electrode and object are relatively vibrated by a vibrating part using a piezoelectric element while a gap between the processing electrode and object is properly retained at all times. The electric discharge is accelerated when the gap is small, whereas the insulated state is maintained when the gap is large. This kind of condition is stably produced in accordance with a frequency of the vibration. If the frequency is set in the range of 50-500 Hz, a shortcircuit or an arc state is less likely to occur. The vibration is effective to quickly discharge processing debris at the discharging gap.

Electric discharge machine with electrode or object vibration and

A method of discharge processing of a semiconductor comprises the steps of: providing a low-resistivity portion on the semiconductor; and application of a given voltage through the low-resistivity portion between the semiconductor and a tool electrode suitably positioned with respect to the semiconductor to discharge the voltage. In the conventional photolithography technique, formation of a through-hole with a good straightness is difficult because of side etching. On the other hand, the prior art discharge processing is difficult to process a semiconductor because a potential barrier occurs, so that a high voltage is required for discharge processing. However, the high voltage deteriorates the semiconductor. In the discharge processing of the invention, a relative low voltage can be used for discharge processing of a semiconductor by providing the low-resistivity portion on the semiconductor. The low-resistivity portion may be formed by deposition of aluminum.

Method of discharge processing of semiconductor

A pen-type computer input device is used to move a cursor on the display of a computer system or enter data such as of figures, letters, numerals, or the like into a computer system. The pen-type computer input device includes a shank, a ball rotatably supported on the tip end of the shank, a pair of rotatable members rotatable about X and Y axes extending perpendicularly to each other and held in rolling contact with the ball, and a rotation detector for detecting the direction in which the rotatable members rotate and the distance by which the rotatable members move. Since the rotation of the ball is directly transmitted to the rotatable members and the distance by which the rotatable members move is detected, the pen-type computer input device is small in size and can easily be handled.

Pen-type computer input device

A pen-type input device for computers includes a ball rotatably supported by an end of a pen-like elongate handle and rotatable in response to the movement of the pen-type input device for causing one or both of first and second rotating detection members to rotate about their own axes extending perpendicular to one another, and a pattern on each respective rotating detecting member having a series of alternating light-reflecting portions and light-absorbing portions for receiving light projected from a light-emitting device and for reflecting light back to a light-sensitive device which in turn sends an electric detection signal to a detecting circuit of a circuit board. The direction of rotation and the amount of movement of each respective rotating member is detected by the detecting circuit and the detected data are sent to a computer whereby a curve corresponding to the movement of the ball is created on a display surface of the computer.

Pen-type input device for computers having ball with rotational sensors

A pen-type computer input device is used to move a cursor on the display of a computer system or enter data such as of figures, letters, numerals, or the like into a computer system. The pen-type computer input device includes a shank, a pen nib disposed on the tip end of the shank, and a sensor disposed in the shank, for detecting the directions in which and the distances by which the pen nib moves in two perpendicular directions in a plane, in response to movement of the pen nib, and for producing an output signal representative of the directions and distances. Since the sensor can detect the distance by which the pen nib moves without any mechanical motion transmitting mechanism incorporated in the pen nib, the pen-type computer input device may be small in size and can be handled with ease.

A pen-type computer input device is used to move a cursor on the display of a computer system or enter data such as of figures, letters, numerals, or the like into a computer system. The pen-type computer input device includes a shank, a ball rotatably supported on the tip end of the shank, the ball having a plurality of identifiable regions on an outer peripheral surface thereof, and a circuit including a sensor unit for detecting the identifiable regions in response to rotation of the ball, and for detecting the directions in which the ball rotates and the distances by which the ball moves two perpendicular directions in a plane, and producing an output signal representative of the directions and distances. Since the sensor unit can detect the distance by which the pen-type computer input device moves without any mechanical motion transmitting mechanism incorporated in the shank, the pen-type computer input device may be small in size and can be handled with ease.

An apparatus for working an aspherical surface on a workpiece including a mechanism for adjusting a position of a workpiece in a horizontal direction, a rotary table having a vertical axis of rotation rotatably mounted on the adjusting mechanism, the rotary table including a work chuck for holding a workpiece on the rotary table, a spindle having a tool on a lower end thereof, a mechanism for rotating the spindle around an axial direction thereof and a compressed spring for supporting the spindle. A first mechanism adjusts a position of the tool in the axial direction of the spindle, the first mechanism including a sliding plate for sliding the spindle in the axial direction thereof. A second mechanism includes an axial mechanism for rotating the first mechanism about a horizontal axis of rotation perpendicular to the axial direction of the adjusting mechanism, the second mechanism supporting the first mechanism at one end of the axial mechanism, the second mechanism further including a balancer for balancing the first mechanism at the other end of the axial mechanism. A guide roller engages the balancer to position the second mechanism in a rotational position around the horizontal axis of rotation of the axial mechanism. A rotary encoder detects the rotational position of the second mechanism and a third mechanism adjusts a position of the second mechanism together with the first mechanism in a vertical direction.

Apparatus for working curved surfaces on a workpiece

An electric discharge machining system of machining a microshaft by electric discharge made between the microshaft and a conductive wire used as a working tool. The microshaft is vertically supported by a bearing to be rotatable about its own axis and movable up and down in directions of the axis by a microshaft driving device and the wire is arranged to travel in a direction of its own axis and to be movable in directions close to and away from the microshaft by a wire driving device, whereby the wire is relatively movable with respect to the microshaft in horizontal and vertical directions. On the electric discharge machine, a control unit controls the microshaft driving device and wire driving device so that the wire is moved up to a predetermined position horizontally away by a first predetermined distance from a first reference point in the horizontal directions that the axis of the wire intersects the axis of the microshaft and the microshaft is moved vertically by a predetermined distance with respect to the wire with the wire travelling in the direction of its own axis and the microshaft being rotated about its own axis. As a result, the microshaft is machined to have a diameter equal to twice the first predetermined distance and the machined portion of the microshaft has a length corresponding to the second predetermined distance.

Electric discharge machining method and apparatus for machining a

Processing of plural works can be made simultaneously by using divided laser beams which is issued from one large Co.sub.2 laser beam source, the dividing being made by one or more rotary chopper mirror(s) comprising reflecting parts and light passing parts, and its ration and pulsive start and stop of laser oscillation are controlled in interrelated manner and by controlling the duty time of the laser oscillation in PWM manner. The distribution of powers of the laser beams divided by the rotary chopper mirrors is desirably selectable, thereby enabling simultaneous processing of plural works under the different processing conditions.

Apparatus for processing multiple workpieces utilizing a single laser

In a polygon mirror construction comprising a polygon mirror with a hole formed at the central position for passing through a shaft of a motor and a supporting means fixed to the shaft of the motor for supporting the polygon mirror, and a space, a groove or a heat insulating plate is formed between the polygon mirror and the supporting means, thereby a heat rise of the polygon mirror is prevented and high accuracy of the polygon mirror construction is assured.

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Kawasaki, Japan

Takeshi Masaki