Showing papers on "Flexible electronics published in 1973"

Indicator module and method of manufacturing same

Abstract: A gas discharge indicator module comprises a flexible strip printed circuit with a flat alphanumeric gas discharge indicator tube connected at one end, a multiple contact electrical connector fastened at the other end, and the electronic circuit components associated with the indicator tube connected to the flexible printed circuit strip between the indicator tube and the electrical connector with the appropriate circuit interconnections effected by the printed wiring. The flexible printed assembly is folded in accordian fashion with the flat indicator tube and the electrical connector at either end of the folded assembly and parallel to one another. The folded assembly is inserted into a case whereby the flat indicator tube is viewable at the front of the case and the electrical connector is disposed at the rear of the case for making electrical connection to the indicator module.

Flexible printed circuit interconnecting cable

Abstract: A flexible printed circuit interconnecting cable which includes a flexible circuitry assembly including an array of conductors mounted on a flexible substrate film and covered with a flexible covering film. In order to achieve flexure through a plurality of coordinates of planes, the substrate is cut or slit longitudinally between mutually adjacent pairs of conductors, and thereafter opposed end segments of the assembly are twisted relative to each other so as to achieve a plurality of independent helices which will provide a flexural plane for any desired relative motion between the opposed ends of the assembly. The slit wound portion may be covered with a sleeve of flexible material such as, for example, vinyl tubing or metallic spring material.

Adhesive composition for flexible printed circuit and method for using the same

Abstract: As an adhesive used for a laminate for a flexible printed circuit, there is provided an adhesive composition comprising as the essential components a polyester resin, an isocyanate compound, and a B-stage epoxy resin. This composition is excellent in flow property and rapid curability and is suitable for use in a continuous adhesion between a plastic insulating film and a conductive foil by means of a roll-laminator and it affords an excellent characteristic to the laminate a printed circuit. There is also provided an adhesive composition which contains, in addition to the above ingredients, a styrene copolymer comprising maleic anhydride, or an alkyl maleate as a structural unit, or a metallic salt of an aliphatic carboxylic acid in order to prevent blocking and promote curing of the adhesive in a roll laminating process. The addition of a small amount of a pigment results in an adhesive composition which is effective in the economical production of a laminate for a colored flexible printed circuit, and which has the effect of preventing the blocking and improving the weather resistance of the adhesive.

Electrically addressed apertured modulator for electrostatic printing

Abstract: Modulated apertured non-contact electrostatic printing wherein a stream of ions is modulated by passage through one or more rows of electrically addressed apertures containing bipolar electrostatic fringing fields of force into a mist of uncharged toner particles to impinge upon such particles causing them to become charged and attracted onto a print receiving medium. Specified particle modulator constructions wherein a plurality of very small closely spaced modulating apertures are positioned on a flexible printed circuit board having printed circuit lead lines extending between each aperture and printed terminal pads. The terminal pads are arranged in straight parallel rows for attachment to conventional printed circuit card edge connectors and, thereby, to printed circuit cards carrying control circuitry. Each of the printed circuit leads joining one of the apertures to one of the terminal contact pads is comprised of a first section extending from the aperture in a direction substantially perpendicular to the rows of apertures, and a second section extending in a direction substantially parallel to the rows of apertures between the distal end of the first section and one of the terminal contact pads. The circuit board is fabricated from a flexible dielectric substrate having a continuous electrically conductive backing. The printed circuitry, including the aforementioned lead lines and terminal contact pads, appears upon the opposite side of the substrate. The terminal contact pads are positioned on a flexible flap cut in the flexible circuit board and are electrically connected to conventional circuit card edge connectors which have two rows of terminal prongs depending therefrom by wrapping the flap across an elongate filler block with the terminal contact pads facing upwardly in alignment with the terminal prongs, wedging the flap between the rows of terminal prongs and the filler block and soldering the terminal prongs to the pads.