Showing papers on "Flexible electronics published in 1975"

Simplified tabulator keyboard assembly for use in watch/calculator having transparent foldable flexible printed circuit board with contacts and actuator indicia

Abstract: A tabulator keyboard of simplified design may be fabricated from a single flexible circuit and a minimum of other mechanical structures. The flexible circuit combines in one piece an array of deformable upper contacts, an array of stationary lower contacts, as well as the required interconnections between the elements of these arrays and the electronics module. The flexible circuit may be made of a reasonable transparent dielectric film (e.g. polyamide). The flexible circuit is folded in use such that the lower stationary array has its conductive surface opposite the upper deformable array. Means are provided for making electrical contact between a selected element in said lower array with a selected element in said upper array.

Keyboard assembly with overlapped flexible printed circuit cable switch

Abstract: This invention relates to a keyboard switch assembly having a minimal number of components. A flexible printed circuit cable is configured in such a manner so that the flexible printed circuit cable contains complementary overlapping contact points interconnected by printed circuit electrical lines. A spacer plate with apertures corresponding to sets of complementary contact points is interposed between segments of the folded flexible printed circuit cable. A method for making a keyboard switch assembly with a flexible printed circuit multiple switch assembly is disclosed.

Transitional connector for printed circuits

Abstract: A flexible printed circuit is connected to a hardboard printed circuit by a cap which receives an end portion of the hardboard printed circuit having continuous portions at one end of the flexible printed circuit wrapped longitudinally thereabout. The hardboard printed circuit has a longitudinal latch portion which extends through aligned slots in the flexible printed circuit and cap and engages an extending finger of the cap. A portion of the flexible printed circuit disposed in the cap carries a resilient pad for biasing the conductor strips of the printed circuits into engagement.

Flexible cable for digital watch

Abstract: A flexible printed circuit, located within a digital watch, which provides the interconnection circuitry between the digital watch's electro-optical displays and the electronic components and the batteries and the watch push buttons. The flexible printed circuit consists of a pliable plastic material to which battery contacts, push button contacts, interconnection circuitry (between the batteries, watch push buttons, electronic component, and electro-optical displays), and contacts for the electronic components and displays are affixed.

Printed circuit for photographic cameras

Abstract: A space is formed between a wall of a camera body and a part of a printed circuit board fixed to the wall of the camera body. A part of a flexible printed circuit and a resilient member are inserted into the space to resiliently press the flexible circuit onto the printed circuit board to assure a tight electric contact between the flexible printed circuit and the printed circuit board.

Designing flex circuits for improved flex life

Abstract: The findings and conclusions of the study described in this paper can be summarized as follows: 1. The conductor cracking of the initial design of the flex circuit is inherent in this design. 2. The redesign for increased stiffness of the flex circuit is an improvement by about a factor of two over the problematic initial design, but falls short of providing an adequate minimum flex life of 20 cycles. 3. The redesign for increased flexibility of the flex circuit has a flex life improvement by about a factor of 20 over the initial design and exceeds the minimum flex life requirement by at least a factor of four. 4. The above conclusions are supported by both analytical and experimental results, which are in excellent agreement with each other.