 Manufacture of internally reinforced boxes |
| The invention provides a process and machine for forming Bliss boxes with internal reinforcing and ... |
|
| Bi-metallic thermo-barrier material and method of welding |
| The invention comprises a multilayer cellular core material constructed of titanium alloys, inconel,... |
|
| Multi-ply heat-insulating material |
| What is claimed is: 1. Multi-ply heat-insulating structure of which one side is exposed to heat, ... |
|
| Insulated barbeque unit |
| The present invention utilizes a pair of half cylinders which are hinged along one of their edges ... |
|
| Sheet type composite material and method and apparatus for manufacturing the same |
| I claim: 1. A process for making a sheet type composite material characterized by the steps of ... |
|
| Thermal insulating mat |
| I claim: 1. A thermal insulating mat comprising a plurality of sealed chambers filled with a filler ... |
|
| Catalytic reactor arrangement including catalytic reactor matrix |
| OF THE DRAWINGS FIGS. 1 through 4 show possible folding patterns for forming a matrix for a ... |
|
| Method of making a metal honeycomb catalyst support having a double taper |
| The catalytic converter of this invention is made by folding a strip of metal back and forth upon ... |
|
| Metal honeycomb catalyst support having a double taper |
| The catalytic converter of this invention is made by folding a strip of metal back and forth upon ... |
|
|
Printed circuit board
| Details |
Inventors: Hatakeyama, Akihito; Nakatani, Seiichi; Kawakita, Kouji; Sogou, Hiroshi; Ogawa, Tatsuo; Kojima, Tamao;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Potter; Roy
Assistant Examiner:
Attorney, Agent or Firm: Morrison & Foerster LLP
A printed circuit board includes an uncured substrate material with closed voids which are disposed with a through-hole. When the through-hole is formed, voids which exist in the substrate material open from inner wall of the through-hole to form a hollow-shaped part. By filling the through-hole and the hollow-shaped part with conductive paste, the adhesion improves by the increased holding effect between the conductive paste and the wall surface of the through-hole. |
|
DETAILED DESCRIPTION OF THE INVENTION This invention will be described by referring to the following illustrative examples and attached figures.
EXAMPLE 1 FIG.
1 is a cross-sectional view of one embodiment of this invention showing a circuit substrate.
FIGS.
2(a) to 2(e) are cross-sectional views explaining a method of manufacturing a circuit substrate.
As shown in FIG.
1, a circuit substrate of this embodiment comprises an insulating substrate 101 formed by compressing and hardening a porous base material impregnated with thermosetting resin through heating and pressurization, circuit patterns 102 formed by etching metal foil adhered on the porous base material through heating and pressurization, conductive paste 103 filled into through-holes disposed in the porous base material, and a part of binder resin 103a in conductive paste 103 which is impregnate in the porous base material.
With reference to FIG.
2(a), the above-mentioned circuit substrate comprises a porous base material 202 of 180 .
mu.
m in thickness which is provided with protective films 201 made of polyethylene terephthalate or the like on both sides with a thickness of 12 .
mu.
m.
Porous base material 202 used here was a base material having small holes or voids 202a in the inside, for example, a base material consisting of a composite material prepared by impregnating thermosetting epoxy resin(e.
g.
"EPON1151B60" manufactured by Shell) into a nonwoven fabric of aromatic polyamide (aramid) fibers (e.
g.
"Kevlar" manufactured by Dupont, fineness: 1.
5 denier, length: 7 mm, METSUKE: 70 g/m.
sup.
2).
This base material is hereinafter referred to as aramid-epoxy sheet.
The ratio in volume of voids 202a to aramid-epoxy sheet 202 is 40%.
Subsequently, as shown in FIG.
2(b), through-holes 203 of 200 .
mu.
m in diameter were formed at predetermined places in aramid-epoxy sheet 202 by utilizing a laser processing method such as with a carbon dioxide laser.
Next, as shown in FIG.
2(c), through-holes 203 were filled with conductive paste 204
|
| Related patents |
|
|
Method for manufacturing a multilayer printed circuit board
U.S. Pat. No. 3,998,601 discloses a composite foil and a method for manufacturing the latter. The composite foil comprises an electrodeposited copper support layer and a ...
|
|
|
Cylindrical linear motor having individually toothed laminated primary cores
Accordingly, it is an object of the present invention to provide a cylindrical linear motor which overcomes the aforementioned problems encountered in the conventional ...
|
|
|
Rotor for a synchronous reluctance machine
It is, therefore, an object of the present invention to provide an improved rotor for a synchronous reluctance machine that secures the rotor sections to the shaft at ...
|
|
|
Stator structure of reciprocating motor
Therefore, an object of the present invention is to provide a stator structure of a reciprocating motor, which is capable of simplifying the processing and the ...
|
|
|
Reciprocating motor
Therefore, an object of the present invention is to provide a reciprocating motor which is able to ensure and to be compacted since an outer stator or an inner stator ...
|
|
|
Method and apparatus for mode selection for high voltage integrated circuits
Disclosed is a method to select alternative functional modes of operation of an integrated circuit through a terminal that can withstand a high maximum voltage. In one ...
|
|
|
Layered self-regulating heating article
OF THE INVENTION From the foregoing discussion it is apparent that by utilizing the teaching of the present invention thermoplastic polymer compositions having PTC ...
|
|
|
Contact assembly
In accordance with one embodiment of the present invention, a contact apparatus is provided to facilitate high contact densities, while minimizing crosstalk and ...
|
|
|
Process for the production of a honeycomb core from foil strip utilizing a position detector
Thus, the invention is based upon the task of creating a process for the production of a honeycomb core which will supply a honeycomb core of practically any desired ...
|
|
|
Waist elastic applicator for diaper or similar article
The present invention is an apparatus for applying tensioned elastic transversely to a moving web of material. The apparatus is suitable for application of the elastic ...
|
|
|
Metal Working 
