Industrial Technology Research Institute

Lite-on Technology Corporation

Other

Silitek Electronic (guangzhou) Co., Ltd.

Hsi-Pin Li

Jui-Fang Liang

Cheng-Fu Tsai

Yea-June Day

Hsin-Jung Chuang

Yu-Feng Huang

Yung-Yu Huang

Hsin-Chih Chen

Hsiang Kuo Lee

Shih-Wei Cheng

Hsiang-Kuo Li

Tsuen-Pann Shieh

Mu-Tian Yan

A auto-focusing method for projection of a computing device with imaging function is illustrated. The computing device exemplarily includes a projection unit, an image receiving unit, and a processing unit. The method firstly controls the projection unit to project images on plural positions along an optical axis. The method then controls the image receiving unit to receive the images, which are regarded as candidate images, projected on the positions by the projection unit. The candidate images correspond to the projective positions. The method further receives the candidate images captured by the image receiving unit, and compute their definitions. Therefore, the image with a greatest definition may be acquired and regarded as a focus image. The focus image's corresponding position is a focus position. After acquiring the focus position, an image may be projected thereon. The illustrated computing device is enabled to complete the image focusing automatically.

Computing device with imaging function and auto-focusing method for projection thereof

A printer with replaceable modules has a printer and an electronic expansion device. The printer has an operating panel mounted on a top thereof, a connecting mechanism formed on a bottom thereof, and at least one connector mounted on the bottom thereof. The electronic expansion device has a mating connecting mechanism removably assembled on the bottom of the printer, and a mating connector connecting with the connector on the bottom of the printer. The printer has an identification interface electrically connecting with the connector for identifying the electronic expansion device. The electronic expansion device can be a scanner, an entertainment device, a data-access device, or a battery.

Printer with replaceable modules

A method for solving the problem that the machining accuracy in a corner part or in a circular arc is reduced by the line flexure during the wire-cut electric discharge machining. In the method, the controller of the wire-cut electric discharge machine with a built-in function of measuring error of wire flexure, after the machining, a detection voltage of the machine detects the machined groove. If the wire electrode comes into contact with the workpiece, the short-circuit caused by the wire flexure in the corner part or in a circular arc is detected, and then the compensation value of the wire flexure is gradually changed to continue the groove detection until the wire electrode and the workpiece are not short-circuited and the groove detection stops. Then the wire flexure value in the corner part or in the circular arc is obtained to establish the machining parameter data of the machine to automatically compensate the wire flexure value in the following machining.

Method of measuring flexure value of wire electrode

An apparatus and method is provided for generating an electric discharge in an alternating direction on a workpiece for line cutting of the workpiece. In particular, the apparatus and method allows the benefits of preventing the workpiece from being cut apart due to excessive power and also preventing electrolysis that can degrade the surface quality of the workpiece. The apparatus includes a negative ignition voltage source, a positive ignition voltages source, a discharging voltage source, and a pulse generator, which are constructed on an all-transistor architecture. Prior to the application of each, electric discharge, low voltages are used to detect the current discharging condition at the discharge gap between the electrode and the workpiece to thereby determine whether the current discharging conditions are normal, arc, or open-circuited, these being then used for adjustment of the power level of the discharging voltage in order to apply thereby the electric discharge onto the workpiece in an alternating direction.

Apparatus and method for generating an electric discharge for use in the line cutting of a workpiece

A wire electric-discharge machining apparatus with recycled electric power is provided, which can recycle the energy stored in the inductor of the discharge circuit to be used as the power source to both the ignition circuit and the discharging circuit, so that the use of electric power is more cost-effective. The wire electric-discharge machining apparatus is of the type having a positive-voltage ignition circuit, a negative-voltage ignition circuit, a discharging circuit, and a snubber circuit. The improvement to the wire electric-discharge machining apparatus comprises: a first voltage converting circuit coupled between the snubber circuit and the positive-voltage ignition circuit; a second voltage converting circuit coupled between the snubber circuit and the negative-voltage ignition circuit; and a third voltage converting circuit coupled between the snubber circuit and the discharging circuit. This foregoing wire electric-discharge machining apparatus is capable of recycling the excessive energy that is intended to be drained out in the prior art into reused power to the ignition circuit and discharging circuit. As a result, the wire electric-discharge machining apparatus not only can help save power consumption and thus electricity cost, but also can help prevent the excessive energy to cause damage to the internal circuitry of the wire electric-discharge machining apparatus.

Power apparatus for wire electric discharge machine

It is a main object of the present invention to improve the drawback of a conventional wire cut EDM which controls the pulse width of discharging current to supply discharge energy under the state of constant current slope. The discharging current slope control method and device of the wire cut electrical discharge machine of the present invention comprises an electrical discharge detecting circuit, a timing controller circuit, a normal discharge driver circuit, an arc discharge driver circuit, normal discharge switch elements and arc discharge switch elements. The slopes of the output triangle waveform currents shall be variable due to the different results of detecting by the electrical discharge detecting circuit, depending on normal discharge or arc discharge condition, to render the current slope of the arc discharge smaller than the current slope of the normal discharge, so as to achieve the effect of keeping a high machining speed without easily breaking of the wire electrode.

Method and device for controlling discharging current slope of wire cut

Disclosed is a feedrate controlling method and apparatus for controlling a wire-cutting electric discharging machine (WEDM) to operate at optimal feedrate. In the apparatus, a discharge frequency counter is used to count the frequency of normal discharge and the frequency of abnormal discharge, from which two performance indexes: stability percent (STB) and efficiency percent (EFF) are obtained. These two performance indexes allow the apparatus to use a decision table to obtain an optimal feedrate variation used to change the current feedrate so as to operate the WEDM with maximum stability and efficiency.

Growing community of inventors

Hsinchu, Taiwan

Hsi-Pin Li