Abstract:
The present invention is to provide a flexible circuit board and a method for production thereof, which are high in connection reliability, and in which the flexible circuit board is formed with a bent portion and can be deformed in a flexible manner, and in which even if deformation is repeated, or if there is heat dissipation from electronic parts, or if fine wiring is formed, exfoliation and breakage of a wiring layer will not occur. The present invention resides in a flexible circuit board which has: an insulating film 2 made of a thermoplastic resin; a wiring layer 3 formed on said insulating film 2; and an insulating layer 4 made of a thermoplastic resin and formed on said wiring layer 3; and which characterized in that said flexible circuit board 1 is formed in at least one place thereof with a bent portion having a radius of curvature R (mm); and said flexible circuit board 1 is constructed such that it is deformable in a state in which the radius of curvature R (mm) of said bent portion is maintained.
Abstract:
An electronic device includes a multilayer circuit board having a non-planar three-dimensional shape defining a membrane switch recess therein. The multilayer circuit board may include at least one liquid crystal polymer (LCP) layer, and at least one electrically conductive pattern layer thereon defining at least one membrane switch electrode adjacent the membrane switch recess to define a membrane switch. The electronic may further include a compressible dielectric material filling the membrane switch recess. The electronic device may also include at least one spring member within the membrane switch recess.
Abstract:
An FPC board (1) includes a base insulating layer (2). The base insulating layer (2) is composed of a first insulating portion (2a) and a second insulating portion (2b). A bend portion (B1) is provided in the first insulating portion. A conductor layer (3) is formed on one surface of the base insulating layer (2). The conductor layer (3) is composed of a collector portion (3a,3b) and a drawn-out conductor portion (4a,4b). A cover layer (6a,6b) is formed to cover the conductor layer (3). A liquid crystal polymer is used as a material for the base insulating layer (2).
Abstract:
The present invention relates to partially rigid flexible circuits having both rigid portions and flexible portions and methods for making the same.
Abstract:
The invention relates to flexible circuits and more particularly to flexible printed circuits having cover layers. The cover layers may be a chemically-etchable adhesive polyimide. The cover layers may be patterned after they are applied to the flexible circuit substrate.
Abstract:
A method is for making a non-planar three-dimensional (3D) multilayered circuit board. The method may include forming a stacked arrangement including at least one pair of liquid crystal polymer (LCP) layers with a bonding layer therebetween. The stacked arrangement may further include at least one electrically conductive pattern layer on at least one of the LCP layers. The method may further include heating and applying pressure to the stacked arrangement to shape the stacked arrangement into a non-planar 3D shape and concurrently causing the bonding layer to bond together the adjacent LCP layers of the stacked arrangement to thereby form the non-planar 3D multi-layered circuit board.
Abstract:
A flexible film is provided. The flexible film includes a dielectric film; and a metal layer disposed on the dielectric film, wherein the dielectric film has a thermal expansion coefficient of about 3 to 25 ppm/°C. The flexible film is robust against temperature variations and has excellent thermal resistance and excellent dimension stability.
Abstract:
A composite electronic and/or optical substrate including polymeric and ceramic material wherein the composite substrate has a dielectric constant less than 4 and a coefficient of thermal expansion of 8 to 14 ppm/ °C at 100°C. The composite substrate may be either ceramic- filled polymeric material or polymer-filled ceramic material.