Abstract:
An object of the present invention is to provide a polyimide multilayer adhesive film in which the thicknesses of the respective layers can be precisely measured by an infrared absorption method and a method for producing the same. In an adhesive film including a highly heat-resistant polyimide layer and an adhesive layer that contains a thermoplastic polyimide and that is disposed on at least one surface of the highly heat-resistant polyimide layer, the adhesive film is produced by a coextrusion-flow casting method and either of the highly heat-resistant polyimide layer or the adhesive layer contains, as a principal component, a polyimide resin having a functional group showing a characteristic infrared absorption wavelength. In the subsequent step of measuring the film thickness, the thickness dimensions of the respective layers are measured with an infrared absorption type thickness gauge, and the thicknesses of the respective layers during the film formation are controlled and adjusted on the basis of the data of the thickness dimensions to produce the adhesive film. Thereby, the polyimide multilayer adhesive film of the present invention can be provided.
Abstract:
A photosensitive conductive paste for electrode formation, containing conductive metal particles, a glass binder, a monomer, a photoinitiator, an organic polymer binder, an organic medium and carbon black.
Abstract:
The invention relates to a method and a device for the reflow soldering of circuit-board conductors with components and modules applied to a printed-circuit board by means of a solder paste, wherein, through radiation of an electromagnetic wave, an absorption material absorbing the radiation is heated and said heating is transferred to the solder paste for melting a solder contained in the solder paste. The solder paste is mixed with the absorption material to form a mixed material and the mixed material is applied to the soldering joints of the circuit-board conductors.
Abstract:
The invention relates to a single- or multilayer, oriented film in which at least one layer is comprised of a thermoplastic polymer having a minimum amount of amide groups. The polymer is a polyester, a polyamide, or a mixture comprised of polyester and polyamide, or is a copolymer comprised of these two materials. The film also comprises a component a) which, when irradiated with electromagnetic or particulate radiation, forms metal nuclei onto which further metal can be accumulated in further steps of the process. The invention also relates to a process for the production of this film, and to its use in printed circuit boards, ribbon cables, smart cards, RFID labels, membrane keyboards, or film-based circuits of any type.
Abstract:
A method of forming a pattern of electrical conductors on a substrate (18) consists of forming metal nanoparticles on a conductive material. A light absorbing dye is mixed with the metal nanoparticles. The mixture is then coated on the substrate. The pattern is formed on the coated substrate with laser light (14). Unannealed material is removed from the substrate.
Abstract:
The invention is to provide a printed circuit board in which advance of packaging density of the printed circuit board and reduction in production cost can be attained while processing quality can be made uniform, a method for processing the printed circuit board and a method for producing the printed circuit board. There is provided a printed circuit board including an alternate laminate of electric conductor layers and electrically insulating layers, wherein a coating layer capable of absorbing laser light but insoluble in an etching solution dissolving the electric conductor layers is provided on a front surface of a first one of the electric conductor layers. In this case, the coating layer may be provided on a front surface of a rear one of the electric conductor layers. Each of the electric conductor layers may contain Cu as a main component while the coating layer may contain CuO as a main component. The coating layer may have a thickness not thinner than 0.6 μm.
Abstract:
The aim of the invention is to provide positioning and mounting options with improved handling characteristics even at places that are difficult to access or in other difficult conditions. Said aim is achieved by using functional elements comprising at least one area that can be foamed by supply energy. At least one of said areas is used as a positioning element for positioning an object or for stiffening flexible or easily bendable materials in a shape-stabilizing manner.
Abstract:
To provide a heat treatment method to efficiently heat-treat an object without depending on the material of the object, a heat treatment layer includes a light-to-heat conversion layer to convert light energy into thermal energy and a base material. The heat treatment sheet is opposed to an object and exposed to light. Thus, the object is heat-treated by thermal energy generated from the light-to-heat conversion layer.
Abstract:
For the laser drilling of organic materials, in particular for making blind holes in dielectric layers, a frequency-doubled Nd-vanadate laser with the following parameters is used: pulse width
Abstract:
The glass transmittance of UV light having a wavelength of 365 nanometers is reduced by compounding an oxide or salt of at least one of Fe, Cu, Cr, Ce, Mn and mixtures thereof. The fiberglass cloth can be used for providing reinforced prepregs used in producing printed circuit boards or laminated chip carrier substrates.