摘要:
High density built-up multilayer printed circuit boards are produced by constructing microvias with photoimageable dielectric materials. A photosensitive dielectric composition on a conductive foil is laminated to conductive lines on a core. After imaging the foil and imaging and curing the photosensitive dielectric composition, vias are formed to the conductive lines. Thereafter the conductive lines are connected through the vias to the conductive foil, and then the conductive foil is patterned.
摘要:
The invention provides organic optical waveguide devices which are lithographically formed and employ polymeric materials having low optical loss, good long term and short term stability, good flexibility and reduced stress or crack induced scattering loss. An optical element has a substrate; a patterned, light transmissive core composition on the surface of the substrate; and a light reflecting cladding composition on the pattern of the core. The core composition has a glass transition temperature of about 80° C. or less and the cladding composition has a glass transition temperature of about 60° C. or less.
摘要:
The invention provides a low stress optical waveguide assembly wherein one or more waveguide cores have a conformal cladding in register the waveguide core. The core and cladding are preferably lithographically formed on a substrate. A connector assembly provides for the precision interconnection of mating arrays of parallel optical waveguides. The connector assembly has a base with several parallel channel walls cut along a surface of the base. A waveguide assembly is positioned on the base. The waveguide assembly comprises a substrate and one or more transparent, polymeric waveguides on and raised from a surface of the substrate. A conformal cladding is in register with the waveguide core. Such conformal cladding contributes to a reduction in waveguide stress. The waveguide assembly is positioned on the base such that each of the waveguides is set in one of the channels and contacts the walls of the channel. A cover plate holds the waveguide assembly on the base.
摘要:
The invention provides organic optical waveguide devices which are lithographically formed and employ polymeric materials having low optical loss, good long term and short term stability, good flexibility and reduced stress or crack induced scattering loss. An optical element has a substrate; a patterned, light transmissive core composition on the surface of the substrate; and a light reflecting cladding composition on the pattern of the core. The core composition has a glass transition temperature of about 80° C. or less and the cladding composition has a glass transition temperature of about 60° C. or less.
摘要:
The invention provides improved high contrast, photopolymerizable compositions suitable for producing high contrast waveguides. The high contrast, photopolymerizable compositions of this invention include a nitrone compound component. The photosensitive composition is an admixture of a free radical polymerizable acrylate or methacrylate component having at least two ethylenically unsaturated groups, a photoinitiator, and a nitrone compound.
摘要:
This invention concerns lasable bond-ply materials comprising a nonwoven reinforcing material and at least one resin material. The present invention also includes methods for using the bond-ply of this invention to manufacture high density multilayer printed wiring boards.
摘要:
This invention concerns lasable bond-ply materials comprising a nonwoven reinforcing material and at least one resin material. The present invention also includes methods for using the bond-ply of this invention to manufacture high density multilayer printed wiring boards.
摘要:
This invention concerns electronic substrates comprising a non-woven filler material and a resin material. The present invention also includes electronic products manufactured from the electronic substrates of this invention including, but not limited to prepregs, metal clad laminates, and printed wiring boards with and without lased via holes. The present invention further includes a method of manufacturing printed built-up wiring boards including the steps of forming a prepreg and forming at least one via in the prepreg.
摘要:
A positive acting, photoimageable composition having, a photoacid generator capable of generating an acid upon exposure to actinic radiation, an organic acid anhydride polymer, an epoxy, a nitrogen-containing curing catalyst, and an optional phenol-containing monomer or polymer. A photographic element has this composition coated and dried on a substrate. A positive acting image is produced by imagewise exposing the element to actinic radiation, optionally postbaking and development with a liquid developer.
摘要:
This invention concerns electronic substrates comprising a non-woven filler material and a resin material. The present invention also includes electronic products manufactured from the electronic substrates of this invention including, but not limited to prepregs, metal clad laminates, and printed wiring boards with and without lased via holes. The present invention further includes a method of manufacturing printed built-up wiring boards including the steps of forming a prepreg and forming at least one via in the prepreg.