As shown in FIG. Please login or register, for FREE, to post comments: 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. The field of the invention is electrical switches, and more particularly, transparent membraneous switches known as touch panel switches or touch screen switches. This description has been by way of example of how the invention can be carried out.

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Also, in the preferred embodiment, a second film 27 of palladium is coated on the bottom ITO layer The ITO is a semiconductive ceramic with excellent transparency and light transmitting characteristics.

Such larger switching devices include transparent touch panels or touch screens as illustrated in FIG. Both analog resistive and matrix touch screens are electrical contact devices with resistance type contacts.

The life of a touch screen is one of its more important characteristics.

The invention provides an dnapro, very thin film of palladium 26 which is coated over the ITO layer Non-Coated 36,Palladium-Coated2, The invention is also illustrated as applicable to a touch switch of the matrix type seen in FIG.

Thus far, the top layer is of a type known in the art. By alternately applying the voltage gradient one bus bar at V INthe opposite bus bar grounded in the X-direction, and later in the Y-direction, and using V OUT valves, the X-Y coordinates of the touch can be determined by the decoding circuitry.

Actuations were at 3 Hz with grams of force. You may also like Other search results for: Two types of resistive touch screen switches are “analog resistive” and “matrix”. Thus, the touch switch acts as a voltage divider circuit.

The analog touch screen of claim 1, wherein the conductors include tin pairs of conductors connected to a top and bottom edge of one of dynzpro transparent layers and to a left and right edge of the other of the transparent layers. The analog touch screen of claim 6, wherein the metallic film is formed on both the layers of semiconductive ceramic and is formed as an exposed surface layer on each of the semiconductive ceramic layers so that the resulting metallic films come into contact with one another when electrical contact occurs between the semiconductive layers.

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3M Touch Systems

In most applications, the base transparent conductor would be indium tin oxide ITO although tin oxide could also be used. Please login or register, for FREE, to post comments: Such examples, however, dynaprl not tjin 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. Improvement in maintaining contact resistance improves the important performance areas of product life and switch function consistency.

The analog touch screen of claim 2, wherein the metallic film consists essentially of palladium. We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. Next Patent Knob assembly for us In the description, reference is made to thkn accompanying drawings, which form a part hereof, and which illustrate examples of the invention.

The contact resistance was much lower than ITO alone at folm beginning of the test, increased only slightly during switch closure cycling tests and generally provided much more consistent performance than ITO without such a film.

United States Patent Thus, coating durability and stability are excellent.

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Transparent touch panel switch. There are a number of variations on how magnetron sputtering is implemented, depending upon the desired target materials and deposition parameters.

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The invention is more particularly embodied in a switch comprising a substrate; a flex member; a spacer between the flex member and the 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 thinn form an appreciable cynapro of insulating oxide, the film being formed over at least one of the first and second switch contacts to reduce the effects of repeated switch operation on contact resistance over many operating cycles.

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A recognized leader in research and development, 3M produces thousands of innovative products for dozens of diverse markets. The analog touch screen of claim 6, wherein the substrate sheet consists essentially of polyester or glass, and the flexible sheet consists essentially tin polyester.

Test results for the palladium were terminated prior to failure so the data represents only a minimum of actuation life and the actual life could be much greater. Table 1 provides a quick overview comparison of the different coating technologies. Transparent touch screens are used as input devices for computers, often being disposed over dunapro screen of a monitor or CRT or other type of visual display.