Touch screen assembly
First Claim
Patent Images
1. In a contact input system;
- a touch screen assembly for determining the coordinates of contact pressure, with said touch screen assembly including a base substrate generally rigid with inner and outer major surfaces, and with an electrically resistive coating and an array of reticulated spaced raised projections on said inner surface, a flexible plastic film secured to said substrate and superimposed upon said resistive coating and array of reticulated spaced raised projections, with the said flexible plastic film having an electrically resistive coating on the inner surface in opposed relationship to said electrically resistive coating and array of reticulated spaced raised projections, and electrodes configured adjacent the perimeters of said electrically resistive coatings for creating generally orthogonal electrical fields and for detecting electrical signals created upon application of contact pressure to said flexible plastic film;
the preparation operations for said touch screen assembly being characterized in that;
(a) said array of reticulated spaced raised projections is prepared by an operation comprising the steps of;
(1) selecting a generally rigid base substrate with an electrically resistive coating formed on the inner major surface thereof and with electrodes adjacent peripheral edges of said electrically resistive coating;
(2) heating said selected base substrate to a temperature greater than about 110°
F.;
(3) applying an adherent layer of release film-backed photoresist to said base substrate over said electrically resistive coating to form a laminate pre-form;
(4) passing the photoresist side of said laminate pre-form beneath a heated pneumatically actuated nip roll to cause said photoresist layer to flow, thereby forming a laminate comprising an adherent photoresist layer of uniform thickness;
(5) masking said adherent photoresist layer with a reticulated pattern, and subjecting the exposed surface of said photoresist layer to incident radiation to which said photoresist layer is responsive;
(6) developing said exposed photoresist layer and removing selected portions of said adherent photoresist layer so as to create said array of reticulated spaced raised projections; and
(b) securing flexible plastic film with an electrically resistive coating thereon to the periphery of said base substrate, said flexible plastic film having an electrically resistive coating on the inner surface thereof and in opposed relationship to said base substrate resistive coating, and with electrodes being configured along the perimeter of the electrically resistive coating of said film.
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Abstract
A touch screen assembly for contact input systems, with the touch screen including a base substrate with an electrically resistive coating thereon. An array of reticulated spaced raised projections are formed on the inner surface, with the raised projections consisting of a developed/cured photoresist. In its formation, the photoresist is applied as an adherent layer with a release-film backing, with the layer being applied onto a heated substrate. Thereafter, a laminate is formed by passing the photoresist layer beneath a heated pneumatically actuated nip roll to cause the photoresist layer to flow, thereby forming a layer of uniform thickness. Thereafter, the laminate is masked, exposed to incident radiation, and developed so as to provide a reticulated pattern of adherent raised projections. A flexible plastic film having a resistive coating thereon is thereafter mounted on the substrate in superimposed relationship to the raised projections.
23 Citations
5 Claims
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1. In a contact input system;
- a touch screen assembly for determining the coordinates of contact pressure, with said touch screen assembly including a base substrate generally rigid with inner and outer major surfaces, and with an electrically resistive coating and an array of reticulated spaced raised projections on said inner surface, a flexible plastic film secured to said substrate and superimposed upon said resistive coating and array of reticulated spaced raised projections, with the said flexible plastic film having an electrically resistive coating on the inner surface in opposed relationship to said electrically resistive coating and array of reticulated spaced raised projections, and electrodes configured adjacent the perimeters of said electrically resistive coatings for creating generally orthogonal electrical fields and for detecting electrical signals created upon application of contact pressure to said flexible plastic film;
the preparation operations for said touch screen assembly being characterized in that;(a) said array of reticulated spaced raised projections is prepared by an operation comprising the steps of;
(1) selecting a generally rigid base substrate with an electrically resistive coating formed on the inner major surface thereof and with electrodes adjacent peripheral edges of said electrically resistive coating;
(2) heating said selected base substrate to a temperature greater than about 110°
F.;
(3) applying an adherent layer of release film-backed photoresist to said base substrate over said electrically resistive coating to form a laminate pre-form;
(4) passing the photoresist side of said laminate pre-form beneath a heated pneumatically actuated nip roll to cause said photoresist layer to flow, thereby forming a laminate comprising an adherent photoresist layer of uniform thickness;
(5) masking said adherent photoresist layer with a reticulated pattern, and subjecting the exposed surface of said photoresist layer to incident radiation to which said photoresist layer is responsive;
(6) developing said exposed photoresist layer and removing selected portions of said adherent photoresist layer so as to create said array of reticulated spaced raised projections; and
(b) securing flexible plastic film with an electrically resistive coating thereon to the periphery of said base substrate, said flexible plastic film having an electrically resistive coating on the inner surface thereof and in opposed relationship to said base substrate resistive coating, and with electrodes being configured along the perimeter of the electrically resistive coating of said film. - View Dependent Claims (2, 3, 4, 5)
- a touch screen assembly for determining the coordinates of contact pressure, with said touch screen assembly including a base substrate generally rigid with inner and outer major surfaces, and with an electrically resistive coating and an array of reticulated spaced raised projections on said inner surface, a flexible plastic film secured to said substrate and superimposed upon said resistive coating and array of reticulated spaced raised projections, with the said flexible plastic film having an electrically resistive coating on the inner surface in opposed relationship to said electrically resistive coating and array of reticulated spaced raised projections, and electrodes configured adjacent the perimeters of said electrically resistive coatings for creating generally orthogonal electrical fields and for detecting electrical signals created upon application of contact pressure to said flexible plastic film;
Specification
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Current AssigneeBerquist Company The (Henkel AG & Co KGaA)
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Original AssigneeBerquist Company The (Henkel AG & Co KGaA)
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InventorsRandall, Mary L.
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Primary Examiner(s)Hjerpe, Richard
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Assistant Examiner(s)Tran, Henry N.
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Application NumberUS09/595,651Time in Patent Office767 DaysField of Search345/173-177, 178/18-1-, 430/311, 430/313, 438/384, 438/780, 338/99, 338/114, 338/115, 338/204, 338/307, 338/308, 427/270-272, 427/66, 427/164US Class Current345/173CPC Class CodesG06F 3/045 using resistive elements, e...
