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(11) | EP 1 147 898 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Double line electrode unit for electro-coagulation printer and method of making it |
| (57) A double line electrode unit for use in an electro-coagulation printer contains a
pair of electrode plates (211, 212), negative electrodes (211b, 212b) and a prepreg
(or an insulating layer) (213). The negative electrodes are linearly arranged with
prescribed intervals of distance (L) therebetween on surfaces of the electrode plates
respectively and are embedded in insulating resin materials (211d, 212d) being solidified.
The insulating resin materials contain fillers that are selected from among prescribed
materials of boron nitride, aluminum nitride alumina and silica. In addition, connectors
(211c, 212c) are arranged on other surfaces of the electrode plates in connection
with the negative electrodes respectively. The electrode plates areconsolidated under
heating and pressurized conditions by way of the prepreg such that the negative electrodes
respectively arranged on the surfaces ofthe electrode plates face with each other
by intervention of the prepreg, which has a prescribed thickness and is made by fabric
material such as glass fibers impregnated with unhardened resin. After filling and
solidifying the insulating resin materials on the negative electrodes of the electrode
plates, inspection is performed such that electrification is made with respect to
each of basic units of negative electrodes to locate an electrification failure area.
Then, the complete electrode plate is made by jointing together a prescribed number
of the basic units of negative electrodes excluding a basic unit of ncgativc electrodes
corresponding to the electrification failure area, which is cut and removed. |