Showing papers on "Flexible electronics published in 1986"

Flexible printed circuit board having integrated circuit die or the like affixed thereto

Abstract: A flexible printed circuit board assembly having an integrated circuit die bonded directly thereto. A first layer of the flexible printed circuit board assembly includes a plurality of conductive paths and geometrical patterns on each of its surfaces. The conductive patterns include pads for mounting the integrated circuit die and connecting the wires from the integrated circuit. Additional intermediate layers of the flexible printed circuit board assembly, having an aggregate thickness greater than the height of the integrated circuit die and associated leads bonded thereto, surround the integrated circuit die. The top layer of the flexible printed circuit board provides for total encapsulation of the integrated circuit die for protection thereof. In the preferred embodiment that portion of the top layer which covers the integrated circuit die is opaque to prevent the passage of ultraviolet light which might otherwise cause damage to the integrated circuit.

Connector assembly for electrically connecting flexible and rigid printed circuits

Abstract: The connector assembly is for connecting the conductive network of a flexible printed circuit to the conductive network of a rigid printed circuit board. The connector assembly comprises an alignment body structure mountable on the printed circuit and for positioning the flexible printed circuit for electrical communication with the rigid printed circuit. The alignment structure has a central aperture in alignment with the printed circuit contacts and a horizontal insertion aperture for ingress and egress of the flexible printed circuit in the plane of the rigid printed circuit. The connector assembly further comprises an elastomeric conductor disposed within the alignment structure so that the elastomeric conductor is between the communicative portions of the flexible printed circuit and the rigid printed circuit. A clamping structure is disposed within the alignment structure and which is operable in the central aperture to releasably urge the contact portions of the flexible circuit into communicative contact with the elastomeric conductor and the aligned contacts of the circuit board.

Flexible sheet reinforced with poly(aromatic amide) non-woven fabric and use thereof

Abstract: A flexible sheet which comprises a non-woven fabric made predominantly from a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m2

Assembly structure of printed circuit boards for camera

Abstract: The present invention relates to a camera having circuit elements arranged by using flexible printed circuit boards. In particular, three or more flexible printed circuit boards on respective different faces of a framework of the camera are provided each with an extension bent to common face contiguous to but oriented at right angles with the board bearing faces. The bent extensions are superimposed one upon another when the electrical connection of all the printed circuit boards is established in one step of assembling operation.

Connector for flexible printed circuit board

Abstract: A connector for flexible substrates which can prevent the flexible substrate exactly from being pulled against ordinary pull-out force and allows the flexible substrate to be pulled out without being broken even when abnormally strong pull-out force beyond the assumed range is applied, and comprising a flexible substrate having an expanded section on its ends, a connector body having a cavity opened upward and the movable contact points of a number of terminals arranged side by side in a row in the cavity, and a housing mounted onto the connector body so as to close opening of the cavity and to hold the end of the flexible substrate inserted through the window of the top wall between a tongue and the movable contact point of the terminals, in which the window of the housing is formed of a wide opening to insert the expanded section of the flexible substrate, and a narrow opening communicated with the wide opening into which non-expanded section following the expanded section of the flexible substrate is fitted when the connector body is capped so that the non-expanded section is interlocked with the housing under the window when fitted into the narrow opening.

A copper-foiled laminated sheet for flexible printed circuit board

Abstract: (@ The copper-foiled laminated sheet of the invention is used to prepare a printed circuit sheet having see-throughness after patterning by etching of the copper foil. Different from conventional copper-foiled laminates using an electrolytic copper foil having a surface roughness of 10 or larger, the inventive laminate is prepared using a rolled cooper foil having a surface roughness of 1.5 to 5 so that the surface of the adhesive layer, from which the copper foil has been removed by etching, has no undue roughness as a replica of the copper foil surface not to irregularly diffuse the light giving a parallel light-beam transmission of at least 50% and overall light transmission of at least 70% to ensure good see-through visibility.

Electrical terminal for flexible printed circuits

Abstract: An electrical terminal is attached to a flexible printed circuit by an attachment means which is in the form of a crimp ferrule which comprises an elongated web which has a plurality of raised convex domes which cooperate with sets of crimp tabs integrally attached at the longitudinal sides of the elongated web. These raised convex domes are set in a pattern with respect to the crimp tabs so that the flexible printed circuit is forced to weave through the crimp ferrule when the crimp tabs are curled or crimped over the flexible printed circuit. This establishes several good and stable electrical contacts between the flexible printed circuit and the crimp ferrule and forces the flexible printed circuit to weave through the attached crimp ferrule to provide a strain relief for the several electrical contacts.

Electrical connector for printed circuits

Abstract: An electrical connector for printed circuits comprises a dielectric connector body (30) and a plurality of sinuous contact strips (32) which have clip portions (72) that are disposed in a socket portion (34) of the connector body for detachable connection to an end tab (26) of a printed circuit board (14) inserted into the socket portion, and elongate portions (74) which are associated with a trailing attachment portion (36) of the connector body for permanent connection to a flexible printed circuit (12) by crimped splice ferrules (86).

Test interface for bare printed circuit boards

Abstract: The invention relates to a test interface making it possible to connect the chips and tracks of a bare printed circuit board to the means for measuring insulation and continuity. It comprises two flexible or semi-rigid printed circuits 5 and 13 pressed respectively against the two faces of the printed circuit under test 9. The two printed circuits of the interface 5 and 13 comprise contact pads, each consisting of a chip 7 connected by a metallised hole 8 to tracks 4 located on the face which is not in contact with the printed circuit under test 9. Connectors 16 and 14 enable the interface to be connected to the means of measurement. Semi-rigid plates 3 and 18, elastic plates 2 and 19, and rigid plates 1 and 20 make it possible to apply a uniform pressure to the two flexible or semi-rigid circuits 5 and 13. Application to the testing of any bare printed circuit boards, particularly those intended to carry surface-mounted components where the interval in the basic matrix is no greater than 1.27 mm.

Double-face flexible printed circuit board

Abstract: The disclosed double-face flexible printed circuit board arranged in a precision apparatus such as a camera has a circuit pattern to electrically check the electrical circuit elements mounted thereon. The electrical check circuit pattern is disposed on one side of the board. The electrical circuit elements are mounted in flat package state on the side of the board opposite the side having the electrical check circuit pattern.

Solder connection between flexible printed circuit board and conductor

Abstract: An electrical connection between a conductive substrate (e.g. a track 11 on a p.c.b.) and a conductive track 2A on a flexible p.c.b. 1 is formed with the track 2A remote from the substrate by a solder joint 13B over the edge of the flexible p.c.b. and by a solder joint 13A through an aperture in the track 2A and the flexible p.c.b. 1. The resulting joint is mechanically strong.

Flexible laminate for printed circuit board and process for its production.

Abstract: A polyimide film obtained by using as starting materials a symmetric aromatic m-substituted primary diamine and a symmetric aromatic P-substituted primary diamine in a given proportion. This film has excellent heat resistance, electric properties, and flexibility. In providing this film on a substrate, a precursor of the polyimide, i.e. a polyamic acid, is applied to the substrate without using any adhesives, and a reaction is allowed to proceed to form a polyimide to thereby provide the polyimide film on the substrate with good adhesiveness. The resulting flexible printed circuit board has the above-described excellent properties.