Abstract:
For the purpose of providing a semiconductor element built-in type multilayered circuit board in which a semiconductor element is closely joined to a recess of an insulating substrate to effectively disperse heat generated from the semiconductor element through the insulating substrate at a working temperature region of the semiconductor element circuit board, to surely conduct an electrical connection of an electronic part such as semiconductor element or the like in a short wiring and to enable the high density mounting of semiconductor elements, miniaturization and increase of working speed, there is proposed a semiconductor element built-in type multilayered circuit board formed by laminating a plurality of semiconductor element built-in type boards each comprising an insulating substrate and a semiconductor element accommodated in a recess formed therein, characterized in that a difference between a linear expansion coefficient of the insulating substrate and a linear expansion coefficient of the semiconductor element in a temperature zone of 20-300° C. is less than 1×10−5/K.
Abstract:
A single-sided circuit substrate for a multilayer printed writing board has an insulating hard substrate, a conductor circuit formed on a surface of the substrate, an adhesive layer formed on the other surface, and at least one viahole through the substrate and the adhesive layer so as to pass these layers and contact with the conductor. The viaholes are filled with conductive paste. The invention also provides a multilayer printed wiring board having an IVH structure constituted with single-sided circuit hard substrates and a method of efficiently manufacturing the same with high yield.
Abstract:
An adhesive for electroless plating is composed of at least one kind of fine powders selected from either a cured heat resistant resin or an inorganic material and easily soluble in a predetermined solution and a heat resistant resin solution sparingly soluble in the predetermined solution by curing treatment. The adhesive for electroless plating in which the above fine powders are dispersed in the above uncured heat resistant resin solution, is coated on a circuit board, dried and cured to form an adhesive layer. When the above predetermined solution contacts with the surface of the adhesive layer, its surface is roughed to be formed a plating film having an excellent adhesiveness by electroless plating.
Abstract:
A second harmonic wave generating device comprising a LiNbO.sub.3 thin film waveguide layer formed on a LiTaO.sub.3 substrate, in which the fundamental wavelength (.lambda..mu.m), the thickness (T .mu.m) of the LiNbO.sub.3 thin film waveguide layer, the ordinary refractive index (n.sub.oS1) of the LiTaO.sub.3 substrate at the fundamental wavelength (.lambda..mu.m), the ordinary refractive index (n.sub.oF1) of the LiNbO.sub.3 thin film waveguide layer at the fundamental wavelength (.lambda..mu.m), the extraordinary refractive index (n.sub.eS2) of the LiTaO.sub.3 substrate at a second harmonic wavelength (.lambda..mu.m/2), and the extraordinary refractive indes (n e F 2) of the LiNbO.sub.3 thin film waveguide layer at the second harmonic wavelength (.lambda..mu.m/2) are individually within the following specific ranges:.lambda.=0.68 to 0.94 .mu.mT=0.3 to 16 .mu.mn.sub.oF1 =2.22 to 2.38n.sub.oS1 =2.10 to 2.25n.sub.eF2 =2.24 to 2.43n.sub.eS2 =2.22 to 2.38
Abstract:
In a method of producing a silicon carbide sintered compact comprising steps of placing silicon carbide fines, a sintering additive and a shaping additive as required into a dispersing medium solution to form a supensoid, sieving operation on said suspensoid, forming a green shape from powders obtained in said sieving operation, and pressureless sintering process; an improvement characterized is that solid content comprising said silicon carbide fines and sintering additive is limited within a range of 10-50% by volume to said suspensoid, and that in the sieving operation, the suspensoid is passed through a sieve having an opening less than 65 .mu.m under a pressure differential between before and after the sieve to remove coarse particles in the silicon carbide fines, sintering additive and others to form silicon carbide sintered compact having a high strength.
Abstract:
A process for producing an ultrafine silicon carbide powder by passing a granulated blend of silica powder, carbon powder and a carbonaceous binder downwardly through a vertical indirect heating reactor, wherein means are provided for increasing the bulk density of the carbon powder for preventing the disintegration of the blend during the reaction which might result from the use of ultrafine powder as the carbon powder in the blend.
Abstract:
An apparatus for producing silicon carbide consisting mainly of .beta.-type crystal are disclosed. The fine silicon carbide consisting mainly of .beta.-type crystal is produced by charging the starting material of silica and carbon with a mole ratio of C/SiO.sub.2 of 3.2-5.0 into a top portion of a vertical-type reaction vessel having a preheating zone, a heating zone and a cooling zone in this order, descending the starting material by gravity through the reaction vessel, heating the starting material in the heating zone at a temperature of 1,600.degree.-2,100.degree. C. by electrically indirect heating in horizontal direction to effect the formation of SiC, cooling the resulting reaction product in the cooling zone under a non-oxidizing atmosphere, and recovering the cooled product from the bottom portion of the reaction vessel to obtain a product having a composition ratio by weight of silicon carbide, silica and free carbon which lies within the area represented by the area ABCD shown in Fig. 1 of the accompanying drawings.
Abstract:
Holes (40a) are formed with a laser beam through an insulating substrate (40) on which a metallic layer (42) is formed and via holes (36a) are formed by filling up the holes (40a) with a metal (46). After the via holes (36a) are formed, a conductor circuit (32a) is formed by etching the metallic layer (42) and a single-sided circuit board (30A) is formed by forming projecting conductors (38a) on the surfaces of the via holes (36a). The projecting conductors (38a) on the circuit board (30A) are put on the conductor circuit (32b) of another single-sided circuit board (30B) with adhesive layers (50) composed of an uncured resin in-between and heated and pressed against the circuit (32b). The projecting conductors (38a) get in the uncured resin by pushing aside the resin and are electrically connected to the circuit (32b). Since single-sided circuit boards (30A, 30B, 30C, and 30D) can be inspected for defective parts before the boards (30A, 30B, 30C, and 30D) are laminated upon one another, only defectless single-sided circuit can be used in the step of lamination.
Abstract:
An adhesive for electroless plating is formed by dispersing particular heat-resistant granules easily soluble in an oxidizing agent into a particular heat-resistant resin sparingly soluble in the oxidizing agent through a curing treatment. A printed circuit board is manufactured by using such an adhesive.
Abstract:
A method for producing a second harmonic wave generating device comprises the steps of:forming a LiTaO.sub.3 thin film adjusted to have an ordinary refractive index (n.sub.oS1) of 2.00 to 2.20 at a fundamental wavelength (.lambda..mu.m) and an extraordinary refractive index (n.sub.eS2) of 2.15 to 2.35 at a second harmonic wavelength (.lambda..mu.m/2) on a LiNbO.sub.3 substrate;forming a LiNbO.sub.3 thin film on top of the LiTaO.sub.3 thin film, the LiNbO.sub.3 thin film adjusted to have an ordinary refractive index (n.sub.oF1) at .lambda..mu.m and an extraordinary refractive index (n.sub.eF2) at .lambda..mu.m/2 represented by the equation: ##EQU1## dry etching the LiNbO.sub.3 thin film to form an LiNbO.sub.3 thin film having a thickness of 0.1 to 30 .mu.m.