Composite electronic device
The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and spiral conductors formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of gap electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the gap electrodes, and the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material. The gap of the ESD protection element is provided at exterior of the spiral conductor so as not to be overlapped with the spiral conductor in view of a laminating direction.
1. A composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein
the inductor element includes a insulation layer made of a resin, and a spiral conductor formed on the insulation layer,
the ESD protection element includes a base insulation layer, at least one pair of electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the pair of electrodes,
the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material, and
the gap is provided at exterior of the spiral conductor of the inductor element so as not to be overlapped with the spiral conductor in view of a laminating direction.
2. The composite electronic device as claimed in claim 1 , wherein the spiral conductor is a round spiral, and the gap has arc-shape along an outer circumference of the spiral conductor.
3. The composite electronic device as claimed in claim 1 further including a magnetic core provided at interior of the spiral conductor.
4. The composite electronic device as claimed in claim 1 , wherein the number of the pair of electrodes is as same as that of input and output terminals of the inductor element.
5. The composite electronic device as claimed in claim 4 further including short-circuiting patterns electrically connecting each ground side of the pair of electrodes.
6. The composite electronic device as claimed in claim 1 , wherein
the inductor element includes first and second spiral conductors formed on a plane surface perpendicular to a laminating direction, and
the first and second spiral conductors are magnetically coupled with each other and thereby constitute a common mode filter.
7. The composite electronic device as claimed in claim 1 , wherein an electrostatic capacitance of the ESD protection element has a value equal to or lower than 0.35 pF.
8. The composite electronic device as claimed in claim 1 , wherein
the resin is one of the polyimide resin and an epoxy resin, and
the insulation inorganic material is at least one kind selected from a group of Al 2 O 3 , TiO 2 , SiO 2 , ZnO, In 2 O 3 , NiO, CoO, SnO 2 , V 2 O 5 , CuO, MgO, ZrO 2 , AlN, BN, and SiC.
9. The composite electronic device as claimed in claim 1 , wherein the conductive inorganic material is at least one kind of metal or a metal compound of these metals selected from a group of C, Ni, Cu, Au, Ti, Cr, Ag, Pd, and Pt.
10. A composite electronic device comprising a common-mode filter layer and an ESD protection layer provided between two magnetic substrates, wherein
the common-mode filter layer includes
first and second insulation layers made of a resin,
a first spiral conductor formed on the first insulation layer, and
a second spiral conductor formed on the second insulation layer,
the ESD protection layer includes
a first ESD protection element connected to one end of the first spiral conductor, and
a second ESD protection element connected to one end of the second spiral conductor,
the first and second spiral conductors are formed in a plane-surface direction perpendicular to a laminating direction, and are arranged to be magnetically coupled to each other,
each of the first and second ESD protection elements includes a base insulation layer, a pair of electrodes arranged via gap formed therebetween on the base insulation layer, and ESD absorbing layer arranged at least between the pair of electrodes,
the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material, and
the gap of the first and second ESD protection elements are provided at exterior of the first and second spiral conductors of the inductor element so as not to be overlapped with the first and second spiral conductors in view of the laminating direction.
11. The composite electronic device as claimed in claim 10 further including
a third ESD protection element connected to the other end of the first spiral conductor, and
a fourth ESD protection element connected to the other end of the second spiral conductor, wherein
the third and fourth ESD protection elements have the same configurations as those of the first and second ESD protection elements, and
the gap of the third and fourth ESD protection elements are provided at exterior of the first and second spiral conductors of the inductor element so as not to be overlapped with the first and second spiral conductors in view of the laminating direction.