In most applications, the base transparent conductor would be indium tin oxide ITO although tin oxide could also be used. Such examples, however, are not exhaustive of the various embodiments of the invention, and therefore reference is made to the claims which follow the description for determining the scope of the invention. Bus bars 33 of silver particle-filled polymer thick film ink connect to the ends of the conductors Metallic films of neutral color may be used as the coating. The analog touch screen of claim 1, wherein the metallic film consists essentially of a metal selected from the group consisting of palladium, platinum, iridium, gold, silver, rhodium, or a mixture thereof.
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Magnetron sputtering generally represents a midground between evaporative techniques and IBS in terms of cost, quality and performance.
A Buyers’ Guide Photonics Handbook The vast majority of optics used in precision scientific, dynzpro, biomedical and military applications incorporate thin-film coatings on their surfaces. However, there are many different implementations of each of the techniques, so this information should serve only as the starting point in discussions with your coating supplier.
Description of the Background Art Transparent touch screens are used as flm devices for computers, often being disposed over the screen of a monitor or CRT or other type of visual display. The switches were unpowered and the contact resistance was measured at intervals up to 1, actuations and more, for the palladium switch.
This test switch, along with a switch made from the identical film with no palladium, were actuated in an identical fashion. In matrix switches, the contacts on one layer are conductive strips running in an X-direction and opposing contacts on a second layer are conductive strips running in a Y-direction, so that each switch location fjlm defined by the intersection of an X-direction conductive strip and a Y-direction fil, strip.
This can cause problems with switch reliability.
Thin-Film Coatings: A Buyers’ Guide
This description has been by way of example of how the invention can be carried out. Conductive traces 35, 36 of silver particle-filled polymer thick film ink connect these conductors 31, 32 to suitable decoding circuitry of a type known in the art to determine the X-Y position of matrix touch panel activation. The invention is more particularly embodied in a switch comprising a substrate; a flex member; a spacer between the flex member and dynappro substrate; a first switch contact of at least semi-transparent, conductive material on the substrate; a second switch contact of at least semi-transparent, conductive material on the flex member positioned in opposing relation to the first contact and spaced apart from the first contact by a gap which is closed when the flex member is moved toward the substrate to bring the contacts in operational contact with each other; and a metallic film which does not form an appreciable amount of insulating oxide, the film being formed over at fllm one of the first and second switch contacts to reduce the effects of repeated switch operation on contact resistance over many operating cycles.
The ITO is a semiconductive ceramic with excellent transparency and light transmitting characteristics.
Metallic films of neutral color may be used as the coating. Dynapro Thin Film Products. Method of making non-precious metal electrical contacts by electroplating.
3M Touch Systems Distributors | SourceESB
The initial contact resistance of the palladium-coated switch was less than half of the non-coated switch, which may be significant, although the switch geometry was not identical. A continuous film would provide an additional resistive element and possibly a significant variation in sheet resistance.
The analog touch screen of claim 1, wherein the conductors include two pairs of conductors connected to a top and bottom edge of one of the transparent layers and to a left and right edge of the other of the transparent layers.
The test results are presented below. Transparent touch screens are used as input devices for computers, often being disposed over the screen of a monitor or CRT or other type of visual display. Similarly, upper bus bar 15 and lower bus bar 16 are connected to the decoding circuitry by thick film conductors 17 and 19 of silver particle-filled polymer.
At this ddynapro, the metal film probably forms islands 27a, as shown in FIGS. Actuations were at 3 Hz with grams of force.
Also, in the preferred embodiment, a second film 27 of palladium is coated on the bottom ITO layer Therefore, sheet resistance is still controlled by the ITO layers 22, The contact resistance was much lower than ITO alone at the beginning of the test, increased only slightly during switch closure cycling tests and generally provided much more consistent fikm than ITO without such a film.
The analog touch screen of claim 7, wherein the conductors include two pairs of conductors connected to a top and bottom edge of one of the transparent layers and to a left and right edge of the other of the transparent layers.
Other search results for: The invention is also illustrated as applicable to a touch switch of the matrix type seen in FIG. Find detailed business information such as key executives, financials and other corporate data on Dynapro