Microcraft Korea Co., Ltd.

Microcraft K.k.

Microcraft

Yorio Hidehira

Sung Ho Choi

Dong Heun Shin

The present invention relates to a resin composition for inkjet printing used to form a resin layer serving as an insulation layer of a printed wiring board by an inkjet printing method.

Resin composition for inkjet printing and printed wiring board prepared by using same

The present invention provides a method of preparing an ink jet resin composition including preparing a liquid (a) including a thermosetting epoxy resin and a first non-volatile acryl compound, preparing a liquid (b) including a pigment and a second non-volatile acryl compound, preparing a liquid (c) including a photoinitiator and a third non-volatile acryl compound, and mixing the liquids (a), (b) and (c) and further including an amine synergist and a viscosity controlling agent to prepare a resin composition. According to the method of preparing an ink jet resin composition of the present invention, an ink jet resin composition may be easily prepared without using a volatile solvent but using acryl compounds as diluents, and the resin composition prepared thereby may have improved heat resistance, chemical resistance and adhesion.

Method of preparing ink jet resin composition

The invention provides a method of apparatus for testing circuit boards which does not require any inner wide power plane so as to detect an open circuit defect and/or a short circuit defect in a conductor path network formed in the circuit board quickly and accurately. An apparatus for testing a circuit board according to the present invention includes a transmission unit () for transmitting electromagnetic (radio) wave signal by way of an antenna () to a circuit board () to be tested, a detecting unit () for detecting signal received by a conductor path () of the circuit board () by using the conductor path () as a receiving antenna, and compare unit () for determining whether or not there is an open circuit defect or a short circuit defect in the conductor path () by comparing the detected signal with reference data of corresponding to a conductor path not including any defect.

Method and apparatus for testing circuit boards

The present invention provides an impedance measuring device for a printed wiring board. The device include an appropriate probe unit to locate measuring points on the printed wiring board. The probe unit has a probe with contact styli to be contacted with the measurement points. The probe is moved to make an arrangement of the contact styli matching the pattern of the measurement points.

Impedance measuring device for printed wiring board

It is the object to automatically measure the characteristic impedance of a printed wiring circuit of a printed wiring substrate using a coaxial probe. The present invention provides an impedance measuring device for printed wiring boards that has a test probe driving means such as a coaxial probe which mounts a test probe unit that has a first contact stylus and a second contact stylus provided at a position apart from the first contact stylus by a certain distance with its tip facing the same direction as the first contact stylus. The impedance measuring device has the test probe unit moveable to any point on the board such that the first and second contact styli may be brought into contact with predetermined points of measurement on the board. The impedance measuring device is characterized by having a second contact stylus turning means turns the second contact stylus of the test probe unit mounted around the first contact stylus.

Growing community of inventors

Okayama, Japan

Yorio Hidehira