Showing papers on "Flexible electronics published in 1983"

Double-sided flexible electronic circuit module

Abstract: A double-sided flexible electronic circuit module is provided having a flexible printed circuit board. The flexible circuit board has a plurality of conductive paths on each surface and a plurality of conductively plated-through apertures being connected to the conductive paths. One side of the flexible circuit board is adapted to carry components with leads; the other side of the flexible circuit board is adapted to receive components without leads. A carrier member, larger than the flexible circuit board and of a size and shape sufficient to accommodate the placement of at least one flexible circuit board, is also provided. The carrier member has a plurality of apertures which are in alignment with the apertures of the flexible circuit board, and a plurality of elongated slots in predetermined positions which extend the entire width of the flexible circuit board which is temporarily affixed onto the carrier member. All of the components are soldered to the flexible circuit board, the carrier member acting as a support member to the components having leads.

Dynamoelectric machine having a large magnetic gap and flexible printed circuit phase winding

Abstract: A dynamoelectric machine having a large magnetic gap and flexible printed circuit phase windings includes a multi-pole samarium cobalt magnet assembly consisting of radially aligned magnets and circumferentially positioned interpole magnets attached to a soft iron ring for providing radially directed magnetic poles of alternating polarity, and a printed circuit winding assembly attached to a soft back iron sleeve for providing electromagnetic poles. The printed circuit winding assembly comprises a lamination of selectively aligned and interconnected printed circuit phase windings, each having serially connected printed circuit coils of the same phase. The winding and magnet assemblies are separated by a small mechanical gap to allow their relative rotation. The magnets and soft iron structures are proportioned to operate near the maximum energy product condition for Samarium Cobalt, where the sum of the mechanical gap thickness and the winding assembly thickness is the magnetic gap in a high reluctance circuit. A large volume of windings is placed within the permanent magnet field and entirely within the magnetic gap to provide a large ampere-turn condition at a low power dissipation. Brushless DC single and multi-phase torquers, brush-type DC torquers, stepper motors, and synchronous motors embodying the dynamoelectric machine of the present invention are highly efficient devices having a very low magnetic drag torque and a magnetic cogging torque substantially equal to zero.

Socket and flexible PC board assembly and method for making

Abstract: The integral interconnect socket and flexible board assembly accepts an electronic module having a plurality of leads arranged in a predetermined pattern. The assembly includes a flexible printed circuit (PC) board having a plurality of conductors and a first set of holes disposed to respectively intersect the conductors. A substantially rigid platform is mounted to the PC board and has a second set of holes. The first and second set of holes are in alignment and define common apertures arranged in the predetermined pattern to receive the leads of the modules. A layer of metal plating formed within the apertures makes electrical connections with the respective conductors. Jacks are mounted to each aperture for receiving the leads and making electrical connections between the leads and the conductors.

Interconnected printed circuit boards and method of connecting circuit boards

Abstract: Interconnected printed circuit boards and a method of connecting different types of printed circuit boards is presented. The method is particularly well suited for connecting the circuit patterns of a flexible printed circuit board to the corresponding circuit patterns of a hard printed circuit board and is easily accomplished by the novel utilization of an electroconductive adhesive. The adhesive connection of the present invention also provides improved ease of separability of the connected circuit boards.

Elongated printed circuit flexible cables and method of making the same

Abstract: Elongated, flexible printed circuit board coaxial cable which is made using a pattern on a flexible PCB substrate on which coaxial cables are formed is described. A series of slits and folds allows one or more elongated cables to be formed in each pattern. Such cables are particularly useful for connecting multi-connector apparatus of the type which requires coaxial cables interconnected in very close spaces, such as the type used in ultrasound transducers. The method for manufacturing such elongated, flexible printed circuit board coaxial cable is also described. The method includes forming a pattern on a flexible PCB substrate on which coaxial cables are formed. Thereafter, a series of slits and folds allows one or more elongated cables to be formed in each pattern. Such cables are particularly useful for connecting multi-connector apparatus of the type which requires coaxial cables interconnected in very close spaces, such as the type used in ultrasound transducers.

Method of producing prelaminates for rigid-flexible printed circuit boards

Abstract: Method of producing prelaminates for rigid-flexible printed circuit boards comprising at least one conducting level using prepregs (4) having predetermined breaking points and flexible metal-clad laminates, which are joined together by means of adhesive. The prepregs (4) are laid in layers on top of one another in accordance with the required thickness of the prelaminate and separated along the predetermined breaking points which form the boundary of the flexible printed circuit board areas. The separations (8) terminate before reaching the outside edges of the prepregs (4), an adhesive strip (5) of suitable size is then bonded onto the uppermost prepreg in each case between the separations (8) which bound the flexible printed circuit board areas in each case and the flexible, non-metallic layer of laminate is applied so as to overlap the predetermined breaking points at least in the area of the adhesive strip (5). Finally, the materials laid in layers on top of one another in this way are pressed together under the action of pressure and heat.

Brake pad with electrical contacts for brake warning systems

Abstract: A brake pad comprises a layer of friction material the working face of which engages a braking surface, and an electrical lead terminating in a contact positioned to engage the braking surface when the friction material is wearing thin, the electrical lead being composed of a flexible strip of insulating material carrying a flexible strip of conductive material, e.g. flexible printed circuit material.

Laminated print coil

Abstract: PURPOSE:To curtail a manufacturing time of coil and to accurately control a number of windings of coil and keep the size constant, by providing a connecting conductor which electrically connects conductor patterns and by folding a printed circuit board CONSTITUTION:The internal ends of respective conductive patterns 23-26 are connected to connecting conductors 27a-27d provided within substrates 22a- 22d These connecting conductors 27a-27d are formed by filling conductive material into the through holes bored through the substrates 22a-22d An electrical coil 21 having a large number of coil windings can be configurated immediately by folding a flexible printed circuit board 22 forming thereon a conductive pattern Moreover, since a conductive pattern can recently be formed on a very thin flexible printed circuit board by the conductive printed circuit baord technique, increase of thickness can be suppressed even in case an electrical coil 21 is formed by folding such flexible printed board

Arrangement for connecting circuit boards

Abstract: The invention relates to an arrangement for connecting hybrids by means of the supply lead and the indication of electrical proximity switches. A flexible printed circuit board is used for this purpose which is connected to the hybrid in the centre region and whose free ends are electrically conductively connected to the supply lead on the one hand and to the indication on the other hand. Contact-making rings are provided on the flexible printed circuit board on the supply lead side, and their positions are matched to the connections of a commercially available plug device.

Substrate material for flexible printed circuits.

Abstract: High-temperature resistant thermoplastics, e.g. polyether-ether- ketone (PEEK) are used as the carrier material for high-temperature resistant, flexible base materials for printed circuits, which thermoplastics, without supplementary agents, are extruded with the metal foil to a duplex- or multiplex- composite.

Display device of cathode-ray tube

Abstract: PURPOSE:To improve significantly the image resolution, by connecting a substrate containing a driving circuit and a CRT socket with a flexible printed circuit board and as a result reducing the limitation for the form and the weight of the driving circuit. CONSTITUTION:A circuit board 7 has a flexible print constitution. A CRT driving substrate 2b is connected flexibly to a CRT socket 3 via the board 7 and supported by a CRT via a different rigid member. The substrate 2b contains all functions to drive the CRT. Furthermore the image resolution is improved with an extremely wide frequency band, and the size and weight of a driving amplifier 4 are increased. However, the member which supports the substrate 2b is very rigid, and the circuit board 7 is flexible. Thus the resistance is sufficiently large to the impact and vibrations. The entire part of a substrate 5 is covered with a shielding case 5 with the resistance to an electromagnetic wave.

Electrode connection of ultrasonic probe

Abstract: PURPOSE:To enable the preparation of a stable probe with limited aging by soldering a flexible printed circuit board without causing a strong stress thereon after slitting is applied thereto properly. CONSTITUTION:A flexible printed circuit board (FPC) is bonded on a glass or a bakelite base 4d with the circuit 4b upward employing an adhesive tending to soften by heat. A slit groove 4e is applied between printed circuits to be soldered. The slitting 4e of the FPC serves to cause little tension, almost eliminating in balance of the tension. Thus, there is no disconnection due to contraction stress of the FPC.