Hoechst Aktiengesellschaft

Hoechst Japan Limited

Wen-Bing Kang

Akihiko Tokida

Nu Yu

Yusuke Takano

Thomas Potrawa

Shizuo Ogura

Andreas Winterfeldt

Tsunetoshi Sugiyama

Light-emitting diodes with hetero-PN-junction

Process for patterning poly(arylenevinylene) polymer films by irradiation with light

Organic electroluminescent device

A detecting apparatus capable of supporting even narrow wire widths and of detecting defects of wires in a non-contact manner is provided. The detecting apparatus comprises an optical sensor, a sensor head, and a signal processing unit. The optical sensor comprises a transparent substrate, a transparent electrode disposed on the transparent substrate, a thin film of a polymer non-linear optical material disposed on the transparent electrode, and a reflective film disposed on the thin film, and is positioned in close approximation to and without contacting an electrode to be measured on the wiring board. The sensor head comprises a light source, optical means for guiding light from the light source into the optical sensor, and detecting means for detecting reflected light from the optical sensor. The detecting means supplies the signal processing unit with a signal corresponding to the intensity of the reflected light when the electrode on the wiring board is applied with a voltage.

Apparatus for detecting defects of wires on a wiring board wherein

A polymer containing triazine rings that has a molecular weight of 5,000-1,000,000 and that comprises a recurring unit represented by the general formula (I): ##STR1## wherein X.sup.1 and X.sup.2 are each independently S, NR.sup.1 (R is a hydrogen atom, an alkyl group or an aryl group) or O; Y may be an alkylene group, a divalent substituted or unsubstituted aromatic ring group that do not contain chromophore moieties or a group in which said aromatic ring groups are bonded or condensed together; Z is either a spacer group comprising a group represented by --G--(CH.sub.2).sub.n -- (n is an integer of 1-10) or a direct bond (G is S, NR.sup.4 or O, and R.sup.4 is a hydrogen atom, an alkyl group or an aryl group); and A is an organic chromophore moiety in which an electron donative group and an electron attractive group are conjugated via a .pi.-electron system. The polymer is lightproof, forms a thin film of high quality and has a high glass transition point.

Triazine polymers

Growing community of inventors

Kawagoe, Japan

Wen-Bing Kang