Microcavity carrier belt and method of manufacture
A method for fabricating an electronic device or component such as an anisotropic conductive film comprising: distributing a plurality of conductive particles into an array of microcavities formed on a surface of a continuous carrier belt, rotating the belt carrying the conductive particles while conveying a surface of an adhesive layer into contact with the surface of the rotating belt, transferring the conductive particles from the microcavities on the belt to the adhesive layer in predefined locations in the adhesive layer corresponding to the array of microcavities on the belt, and separating the adhesive layer from the surface of the belt. In one embodiment, the position of the microcavities is varied in a controlled manner.
1. An anisotropic conductive film (ACF) comprising a plurality of conductive particles disposed in predefined non-random particle locations as a non-random array in or on an adhesive layer, wherein the ACF includes an oblique area that is essentially free from conductive particles that corresponds to an oblique line that runs across the ACF; wherein the ACF has an X-Y plane corresponding to its length and width and a Z-axis corresponding to its thickness and the ACF is insulating in the X-Y plane relative to the Z-axis which is conductive.
2. The ACF of claim 1 wherein said conductive particles are partially buried in the adhesive layer.
3. The ACF of claim 1 wherein the ACF is made by a method comprising: distributing a plurality of conductive particles into an array of microcavities formed on a surface of a continuous carrier belt, rotating the belt carrying the conductive particles while conveying a surface of an adhesive layer into contact with the surface of the rotating belt, transferring the conductive particles from the microcavities on the belt to the adhesive layer in predefined locations in the adhesive layer corresponding to the array of microcavities on the belt, and separating the adhesive layer from the surface of the belt, wherein the belt is a closed loop including a stitching line that runs across the belt from one edge of the belt to the opposite edge at an angle that is oblique with respect to the edges of the belt.
4. The ACF of claim 3 wherein the oblique line is at an angle of about 30 to 80°.
5. The ACF of claim 4 wherein the oblique line is at an angle of about 35 to 60°.
6. The ACF of claim 1 wherein the oblique line is less than about 100μ wide.
7. The ACF of claim 6 wherein the oblique line is less than about 20μ wide.
8. The ACF of claim 1 wherein the adhesive comprises an acrylic, epoxy or phenoxy resin.