Showing papers on "Flexible electronics published in 1985"

Flexible printed circuits and methods of fabricating and forming plated thru-holes therein

Abstract: Flexible printed circuits and methods of fabricating and forming plated thru-holes therein are disclosed. The flexible printed circuits have one or more substantially rigid regions where plated thru-holes are to be formed, the regions being made rigid by the substitution of epoxy glass or other conventional rigid printed circuit board materials in place of the flexible material used for the flexible portions of the circuit. In this manner the thru-holes are formed through conventional printed circuit board layers, allowing plating of the thru-holes using conventional well developed techniques. This process avoids the necessity of plating thru-holes in flexible printed circuit materials currently requiring special equipment and techniques, and further avoids stress concentration at the junction between the rigid plated thru-holes and the adjacent flexible printed circuit. Various methods for forming such circuits and circuits so formed are disclosed.

Coupling device between relatively rotatable members

Abstract: A coupling device for connecting two relatively rotating members 5,6 consists of a flexible web incorporating two or more conductors, e.g. a flexible printed circuit 1, disposed in a convoluted S- form between the said members, each end being secured to a respective rotating member that is provided with a respective input and output connection e.g., electrical connectors. Preferably the conductors are interspersed with thin constant tension springs 8 each end being secured to a respective rotating member. The flexible conductors may also be in the form of optical fibres laid in parallel on a flexible substrate for use in optical fibre transmission systems, or in the form of micro bore flexible tubes laid in parallel on a flexible substrate for use in hydraulic/pneumatic power transmission systems. The relatively rotatable members may be mounted on a common axis and either radially or axially spaced (e.g. Figs. 3, 4, not shown). In use, the limits of relative rotation of the members 5,6 are defined by the points where the bend in the web 1 travels to the respective ends 2, 3.

Production of flexible printed circuit board

Abstract: PURPOSE: To obtain a circuit board having all good heat resistance, electrical characteristic, adhesive property, mechanical characteristic, e.g. flexibility, and dimensional stability, by laminating a metal foil to a thermosetting polyimide film with a specific polyimide film as an adhesive. CONSTITUTION: A polyimide film produced by reacting a symmetric aromatic primary amine group containing a symmetric aromatic meta-substituted primary amine at 100W20% equivalent ratio with an aromatic tetracarboxylic acid anhydride is used as an adhesive in laminating a metal foil to a thermosetting polyimide film. The formed polyimide film is inserted between a film without adhesive property and a metal foil to laminate both film and foil while heating under pressure. The above-mentioned formed film is used as both an adhesive and an insulating layer for lamination. COPYRIGHT: (C)1987,JPO&Japio

Printed circuit board terminal device

Abstract: A printed circuit terminal device which includes a terminal array having very fine pitch between lead lines from a circuit portion including a flexible printed circuit board having a terminal array pattern which corresponds to the terminal array and wiring pattern and which are arranged to alternately extend from two sides of the terminal array pattern thus changing the pitch of the wiring pattern on the flexible printed circuit board to be twice that of the pitch of the wiring pattern of the terminal array. This allows a circuit to be easily and reliably coupled to the electrical terminals having very fine pitch and the formation of the wiring pattern of a coupling portion with the circuit portion can be easily performed and results in an arrangement of very small size. The flexible printed circuit board can be manufactured at low cost and the yield can be increased. Also, circuit elements such as resistors can be mounted on the wiring pattern without changing the wiring pitch.

Wrist information apparatus

Abstract: PURPOSE:To improve the operability with a simple constitution by constituting a band with a layer-built material, which consists of a long-sized flexible circuit board having plural contact patterns and a long-sized pressure-sensitive conductive rubber, and a coating body which coats this layer-built body. CONSTITUTION:A bar-shaped module consisting of a deforming part, which consists of a pressure-sensitive conductive rubber 5, and a base body 4 where an element block 2, etc. are stored is inserted into a flexible resin tube 8, and both ends of this tube are sealed by caps 9 and 9' provided with detaining means, thus constituting a flexible straight wrist information apparatus. Switch functions for input are realized by the layer-built structure, which consists of the pressure-sensitive conductive rubber 5 and a flexible printed circuit board having plural contact patterns, and button mark groups 8b and 8c of the resin tube 8.

Improved heat-resistant polyimide film

Abstract: PURPOSE: To obtain a polyimide film having improved runnability and adhesivity and suitable for flexible printed circuit sheet, etc., by dispersing a specific amount of porous silicon dioxide powder having a specific particle diameter, thereby generating controlled protrusions on the surface without lowering the original physical properties. CONSTITUTION: A polyimide film resin is compounded with 0.005W0.5wt%, preferably 0.005W0.2wt% (based on the resin) porous silicon dioxide powder composed mainly of particles having diameter of 1W5μm (preferably a porous silica gel having a pore volume of 0.4W1.7ml/g and a specific surface area of 250W350m 2 /g). COPYRIGHT: (C)1987,JPO&Japio

Manufacture of flexible printed circuit board

Abstract: PURPOSE:To obtain printed circuit boards of high accuracy and full bendability by a method wherein IC holes and bending holes are bored in a flexible film with adhesive on the basis of carrier holes, and a wiring board is manufactured by using this film. CONSTITUTION:Carrier holes 5 are bored in a coat of adhesive on the flexible film 3 and in a lamination of protection film 1 thereon. Then, IC holes 4 and bending holes 18 are bored on the basis of this hole 5. Thereafter, a metal foil 6 serving as the conductor layer is laminated on the film 3 so as to cover the holes 4 and 18. Then, the adhesive 2 is cured by heating, and it is coated with an etching resist 7. A conductor circuit 8 is formed, and necessary parts are coated 9 by insulation. Afterwards, an IC10 is bonded and sealed with a molding agent 13. The whole is cut at parts of cutting lines 11. This manufacture can yield the titled circuits board serving also for IC bonding of high accuracy and full bendability.

Interference suppressor filter for electronic control devices in motor vehicles

Abstract: An interference suppressor filter for electronic control devices in motor vehicles is proposed which is used to damp radio-frequency interference waves which pass via the plugs for connecting the control devices to motor vehicle units to be controlled into the control device and can disturb the functioning of the sensitive circuit elements of the control unit of the control device. In order to achieve effective damping of the interference effects with the aid of simple means which save on cost and space, an interference suppressor filter is arranged as a L-filter at the input of the interfering effects, namely the plug (3). The inductively operating switching element of the filter is constructed as a extended terminal end (6) of the plug (3) with a ferrite ring (11) surrounding the latter. The capacitively operating switching element consists of a printed capacitor (13, 14) on a flexible printed circuit board (9). The capacitor part (13) which is connected to radio frequency simultaneously forms the line between the plugs (3) and the printed conductors and circuit elements (8) on the printed circuit board (7) of the electronic control device, while the other capacitor part (14) carries earth potential.

Preparation of flexible printed circuit board

Abstract: PURPOSE: To prevent the deterioration of a polymer, in preparing a flexible printed circuit board according to a direct coating method, by performing at least one of a polyamide acid coating process, a solvent removing process and a curing process under an oxygen free atmosphere. CONSTITUTION: In forming a polyimide film layer on a metal foil, a solution containing 8W40wt% of polyamide acid or polyimide is emitted to the surface of the metal foil from a film forming slit to uniformly coat said metal foil. The solvent of the polymer solution directly applied to the metal foil by the above mentioned method is removed under heating at 60W200°C and the coating layer is heated to 200W450°C at last to perform curing. Among a series of coating, solvent removing and curing processes, oxygen is cut off especially at least at the time of intensive heating performing curing to make it possible to suppress the deterioration of the polyimide film to a large extent. COPYRIGHT: (C)1986,JPO&Japio

Flexible printed circuit connector and contact eyelet therefor

Abstract: A flexible printed circuit connector comprises a stabilizer plate and a flexible printed circuit which have a corresponding pattern of holes which receive contact eyelets which attach the flexible printed circuit to the stabilizer plate. The contact eyelets comprise a tubular body having a flange at one end with depending crimp ears at the rim of the flange which pierce through and extend inwardly to clamp the flexible printed circuit against the flange, and depending crimp ears at the opposite end of the tubular body which extend outwardly to clamp the stabilizer plate and the flexible printed circuit against the flange. The stabilizer plate and the contact eyelets are configured for simultaneously crimping all crimp ears of each eyelet.

Coil structure of magnetic head

Abstract: PURPOSE:To cope with the highly recording density and to facilitate work coiling a core by providing plural flexible printed circuit boards and plural hard printed circuit boards and constituting such that a linear conductor on each flexible printed board can be connected. CONSTITUTION:The flexible printed boards 10a and 10b which have plural linear conductors 21 each and are wound in ring-like shapes at plural points on a coil windows 5 in the radius direction, and plural hard printed circuit boards 15 and 20 with external connection terminals 18a and 18b and those 22a and 22b, respectively, which are connected to plural linear conductors 21 by connecting to both ends of the printed circuit boards 10a and 10b, are provided. The linear conductors on the flexible printed circuit boards 10a and 10b are connected through the external connection terminals 18a, 18b, 22a and 22b and also connected to external fine lines. Thus the number of coil patterns can be increase even if the interior of the coil window 5 is small, whereby the titled structure can satisfactorily cope with the highly recording density. Besides, the work coiling the core 1 can be facilitated.

Mounting method of electronic-parts package and structure of electronic-parts package

Abstract: PURPOSE:To reduce the pattern wiring density of a printed circuit board and to shorten the designing and manufacturing period, by connecting a part of a part lead to the printed circuit board directly under the lead, connecting the other part to the printed circuit board at a position, which is separated from a package. CONSTITUTION:An inner short lead part 2b of a part lead, which is protruded downward from an electronic-parts package 1 is connected and fixed to a through hole 5a of a flexible printed circuit board 5. A wiring pattern 5b, which is connected to the lead part 2b, is connected to a lead part 7 at the outer end of the circuit board 5. A long outer lead part 2a is inserted in a through hole in a printed circuit board 3 and fixed by a solder 4. Said part is further connected to the wiring pattern of the circuit board 3. The lead part 7 of the flexible circuit board 5 is inserted in a through hole at a position separated from the package main body 1, and fixed and connected to the wiring pattern of the circuit board 3. The wiring patterns of the printed circuit board, which are concentrated at the part directly under the package main body 1, are dispersed, and the low density can be implemented.

Ultrasonic probe and its production

Abstract: PURPOSE:To easily and properly perform and earth leading in an earth division by using a flexible printed circuit board as the earth drawing member. CONSTITUTION:An ultrasonic probe consists of a packing material 1, an oscillator 2, a packing material 3 formed in a half moon shape, an acoustic matching layer 4 and an earth drawing member 5. In the member 5, plural earth lines EL corresponding to the fraction of an earth electrode are provided and the flexible printed circuit board is used. The end of the earth line EL is connected to the earth electrode of the corresponding oscillator 2 and the other end is formed in a ring shape and a connector or the like is attached thereto.