Showing papers on "Flexible electronics published in 1984"

Capacitive impedance readout tactile image sensor

Abstract: The transduction of mechanical forces to representative electrical signals uses a three layer sandwich structure. The top layer is columns of compliant metal strips over a central elastic dielectric sheet. The bottom layer is a flexible printed circuit board with rows of metal strips and multiplexing circuits. Electrically, the sensor is a capacitor array formed by the row and column crossings with the middle layer functioning as a dielectric spring. A readout of the capacitor values corresponds to a sampled tactile image. The reasons for choosing this transduction method, the performance advantages of capacitive sensing and the design and integration of 64 element imagers into the fingers of a controlled compliance gripper are described.

Portable memory module

Abstract: The portable memory module disclosed herein is constructed in a compact cylindrical form facilitating its use in oceanographic and environmental data acquisition environments. Individual integrated circuit memory components are carried and interconnected by a flexible printed circuit, the components being oriented in columns with pin lines parallel to the axis of a cylindrical battery casing to permit the circuit to be rolled around that casing. The battery casing and rolled printed circuit are then inserted in a protective outer casing, also cylindrical.

Control surface for a trunking personal radio

Abstract: A control surface is positioned on the top horizontal surface of the case of a personal radio. A flexible printed circuit connects the control surface to the internal electronic circuits of the personal radio. A printed circuit board is connected to the flexible printed circuit by a connector soldered to both the flexible printed circuit and the printed circuit board. Some of a plurality of electrical pathways disposed on the printed circuit board are grouped into conductive pairs, while other pathways connect the conductive pairs to the connector. A keypad formed of a sheet of resilient material encases a surface of the printed circuit board. Molded into the keypad are resilient hollow keys, the hollow of each of which contains a conductive pad. When a key of the keypad is depressed, the conductive pad associated with that key makes contact with predetermined ones of the conductive pairs of the printed circuit board, completing an electrical circuit. The completed electrical circuit is detected by the electronic circuits of the personal radio and used to program the functions of the radio.

Flexible printed circuit board for a display device

Abstract: A flexible printed circuit board has one end to be soldered to the terminal section of a display device, such as a liquid crystal display, the terminal section being used for connection to an external circuit. The end of the circuit board is provided with a pair of protrusions on opposite sides. The display device has a small base sheet and a large base sheet bonded together to form a cell. When the protrusions are caused to bear on the side of the cell, a given gap is formed between the portion of the aforementioned end other than the protrusions and the small base sheet of the display device.

Hearing aid with a flexible printed circuit board

Abstract: A flexible printed circuit is attached to the housing of a hearing aid by at least one user-operated control element. The printed circuit further has a bending zone which is devoid of components, and component zones on which components are mounted.

Flexible, printed circuit

Abstract: A flexible, printed circuit with excellent adhesion of the printed tracks, which is obtained by coating one side of a metal foil without an intermediate layer with a polymer consisting of a polyamide, polyimide or polyamide-imide containing siloxane groups, which is obtainable by crosslinking a silicon-modified polyamide prepolymer, polyamide-acid prepolymer or polyamide-amido-acid prepolymer of the formula I, heating the coated metal foil in the temperature range from 50° to 300° C. till a tack-free coating is obtained, exposing the opposite side of the coated metal foil, which side is provided with a photolacquer, through a photo mask, and developing the exposed metal foil.

RF Field coils for NMR apparatus

Abstract: An RF coil 1 or 3 and a capacitive element 9 needed to resonate the coil at a desired Larmor frequency are both fabricated, using etching techniques, on the same printed circuit board. This simplifies the construction of coil assemblies having complex conductive patterns. By utilizing a flexible printed circuit board having a substrate material characterized by high dielectric constant, low-loss and high standoff voltage properties, particularly useful constructions are obtained, e.g. for use in whole body imaging or spectroscopy. Capacitor 9 is formed by overlapping portions of the printed circuit on either side of the board. Gaps may be present in one such portion, the capacitance being adjusted by bridging the gaps. A more complex construction comprising a plurality of conductors lengthwise on the cylindrical surface, but including capacitive element in series therewith, is also disclosed. A window in the conductor pattern may enable viewing of the patient.

Film laminated type ink jet head

Abstract: PURPOSE:To make it possible to attain miniaturization and wt. reduction and to enhance integration and durability, by forming all of a nozzle plate, an ink flow passage plate, an insulating plate, a bimorph type PVdF plate and a flexible printed circuit board from a thin film and laminating, adhering and forming all of them in the above mentioned order. CONSTITUTION:A head is constituted to a nozzle plate film 1, an ink flow passage film 2, an electric insulating film 3 and a bimorph type PVdF film 4 while aluminum electrodes 5 are printed on a drive part. A conductive pattern 8 is printed on a flexible printed circuit board film 6 in order to transmit a drive signal to the aluminum electrode 6 of the PVdF film 4. The film laminated head is thin and, as the material quality thereof, polyester or nylon is used in order to satisfy adhesiveness, flexibility and toughness. Because the head is integrally held and provided with rigidity as mentioned above, miniaturization, et. reduction and the enhancement of integration are attained by integrating the head, ink supply system and the electric signal system and durability is enhanced.

Shape retaining flexible electric circuit board and method of manufacture thereof

Abstract: SHAPE RETAINING FLEXIBLE ELECTRIC CIRCUIT AND METHOD OF MANUFACTURE THEREOF Abstract of the Invention: A printed circuit board composed of a polymer impregnated nonwoven web substrate laminated to electrically conductive sheets which can be manufactured in a process similar to that used for rigid or hardboard printed circuit boards is presented. The printed circuit boards are flexible in the sense that they can be bent to any desired multiplanar shape and will retain that shape after installation.

Flexible printed circuit card, process for the modification of a printed circuit card, and printed circuit card

Abstract: 1. Flexible printed circuit board comprising an insulating substrate (2), covered on a first side with conductive deposits (3) forming the pattern of the printed circuit, characterized in that it further comprises an a second face opposite to the first a layer (5) of adhesive transfer material.

Multilayer circuits made of a thermoplastic composite

Abstract: For manufacturing multilayer circuits, the inner layers of which consist of the flexible base material described in FR-PS 2,094,162, and is used as a prepreg of the thermoplastic of this base material, the printed circuit boards are tempered at a temperature close to the melting point of the thermoplastic, a plurality of printed circuit boards are then sandwiched together using the same, untempered thermoplastics and are pressed together at a temperature near the melting point of the untempered thermoplastic. In the production of a direct composite - multilayer circuit/flexible printed circuit board - one or more sections of the flexible printed circuit used for the production of the multilayer circuit are pressed together either as a prepreg or directly as an inner layer.

Flexible printed circuit

Abstract: A flexible printed circuit in which no cracks are formed in the circuit itself and in its components, and in which the components do not delaminate, comprises a flexible electrically insulating base film, a plurality of conductive thin-film layers and an electrically insulating elastic protective layer which is formed in such a way that it covers at least those regions of the conductive layers which are subject to bending.

On-demand type ink jet head

Abstract: PURPOSE:To cause the electrode of a piezo element to positively contact with a flexible printed circuit board, remove high harmonic component and expedite the attenuation of vibration by interposing an electric conductive elastic member between the piezo element and the board. CONSTITUTION:A flexible printed circuit board 3 (EPC) is applied to piezo elements 2 of a head body 1 through electric conductive elastic members 10 (preferably electric conductive rubber) and they are compressed from both sides by head covers 4 through No.2 elastic members 5 applied to the back of FPC3. The FPC3 has a contact part 39 which is brought to contact with electrodes of piezo elements 2 and a wiring unit 37 connecting to external circuits, and this wiring unit 37 is coated with insulation covering 38. EFFECT:Even if individual piezo elements are uneven in height and the contact part 39 of FPC3 is lower than the insulation covering 39, the contact part 39 of FPC3 can be positively and electrically connected to piezo elements 2.

Solvent for cleaning film circuits and printed circuit boards

Abstract: To remove rosin and activated residues of a flux complying with DIN 8511 on film circuits and printed circuit boards after the soldering process, a solvent with the components ethanol and/or n-butanol and acetylacetone is used.