摘要:
A light source includes a substrate; an array of un-packaged light emitting semiconductor devices (LESDs), each of the LESDs having at least one surface for emitting light and a substrate surface being attached to the substrate; and a plurality of electrical connections, each electrical connection coupled for providing electrical power to a respective LESD. The LESDs are arranged on the substrate with sufficient density and light generating capability to provide a predetermined irradiation from the light source.
摘要:
An interface includes a surface having an electrically conductive pad; a compliant coating over the surface having a via extending to the pad; metallization patterned over the compliant coating and extending into the via; a low modulus dielectric interface layer overlying the compliant coating and having an interface via extending to the metallization; and a floating pad structure including floating pad metallization patterned over the dielectric interface layer with a first portion forming a central pad and a second portion forming an extension from the central pad extending into the interface via. Another interface includes a substrate including a low modulus dielectric interface material having a hole extending at least partially therethrough and a floating contact structure including electrically conductive material coating the hole with at least some of the floating pad metallization forming an extension from the hole. A conductive contact area interface may include an electrically conductive first contact area; an electrically conductive second contact area facing and being substantially aligned with the first contact area; and at least one interface structure coupled between the first and second contact areas and including an electrical conductor having a partially open interior to form a compliant joint between the first and second contact areas.
摘要:
An interface includes a surface having an electrically conductive pad; a compliant coating over the surface having a via extending to the pad; metallization patterned over the compliant coating and extending into the via; a low modulus dielectric interface layer overlying the compliant coating and having an interface via extending to the metallization; and a floating pad structure including floating pad metallization patterned over the dielectric interface layer with a first portion forming a central pad and a second portion forming an extension from the central pad extending into the interface via. Another interface includes a substrate including a low modulus dielectric interface material having a hole extending at least partially therethrough and a floating contact structure including electrically conductive material coating the hole with at least some of the floating pad metallization forming an extension from the hole. A conductive contact area interface may include an electrically conductive first contact area; an electrically conductive second contact area facing and being substantially aligned with the first contact area; and at least one interface structure coupled between the first and second contact areas and including an electrical conductor having a partially open interior to form a compliant joint between the first and second contact areas.
摘要:
An interface includes a surface having an electrically conductive pad; a compliant coating over the surface having a via extending to the pad; metallization patterned over the compliant coating and extending into the via; a low modulus dielectric interface layer overlying the compliant coating and having an interface via extending to the metallization; and a floating pad structure including floating pad metallization patterned over the dielectric interface layer with a first portion forming a central pad and a second portion forming an extension from the central pad extending into the interface via. Another interface includes a substrate including a low modulus dielectric interface material having a hole extending at least partially therethrough and a floating contact structure including electrically conductive material coating the hole with at least some of the floating pad metallization forming an extension from the hole. A conductive contact area interface may include an electrically conductive first contact area; an electrically conductive second contact area facing and being substantially aligned with the first contact area; and at least one interface structure coupled between the first and second contact areas and including an electrical conductor having a partially open interior to form a compliant joint between the first and second contact areas.
摘要:
A switch structure having a base surface; a first high density interconnect (HDI) plastic interconnect layer overlying the base surface layer; a cavity within the HDI plastic interconnect layer; at least one patterned shape memory alloy (SMA) layer overlying the HDI plastic interconnect layer and the cavity, and at least one patterned conductive layer over the at least one patterned SMA layer; a fixed contact pad within the cavity and attached to the base surface and a movable contact pad attached to a portion of the first patterned SMA layer within the cavity such that when the first and second patterned SMA layers and the first and second patterned metallized layers are in a first stable position, the movable contact pad touches the fixed contact pad, thereby providing an electrical connection and forming a closed switch. The structure has a second stable position in which the SMA and metallized layers are flexed away from the cavity so that the contact pads are not in contact and form an open switch.
摘要:
An electromagnetic system for detecting cracked rail and enhancing traction when necessary, includes wiring coils around wheel axles, and a corresponding power source for supplying power to the coils for producing electromagnetic flux. The produced electromagnetic flux is routed through the wheel axles, wheels and rails in a closed circuit. When a cracked rail is encountered along the route, the circuit will be interrupted or open, resulting in a changed flux pattern. This pattern change is detected by a flux sensor, and the geographic location of the crack in the rail is determined. The electromagnetic system further includes an electromagnetic wheel loading means for generating an attraction to the rails. The generated attraction to the rails increases friction between the wheels and the rails, thereby increasing traction to enable hauling greater loads up steep grades.
摘要:
A switch structure having a base surface; a first high density interconnect (HDI) plastic interconnect layer overlying the base surface layer; a cavity within the HDI plastic interconnect layer; at least one patterned shape memory alloy (SMA) layer overlying the HDI plastic interconnect layer and the cavity, and at least one patterned conductive layer over the at least one patterned SMA layer; a fixed contact pad within the cavity and attached to the base surface and a movable contact pad attached to a portion of the first patterned SMA layer within the cavity such that when the first and second patterned SMA layers and the first and second patterned metallized layers are in a first stable position, the movable contact pad touches the fixed contact pad, thereby providing an electrical connection and forming a closed switch. The structure has a second stable position in which the SMA and metallized layers are flexed away from the cavity so that the contact pads are not in contact and form an open switch.
摘要:
A method of making a solid state thermal transfer device includes first and second electrically conductive substrates that are positioned opposite from one another. The solid state thermal transfer device also includes a sealing layer disposed between the first and second electrically conductive substrates and a plurality of hollow structures having a conductive material, wherein the plurality of hollow structures is contained by the sealing layer between the first and second electrically conductive substrates.
摘要:
A refrigeration system is provided. The refrigeration system includes at least one thermal blocking thermotunneling device. The thermal blocking thermotunneling device comprises a first and a second surface separated by a nanoscale gap of less than about 20 nm, such that tunneling of electrons causes a unidirectional transfer of heat from the first surface to the second surface. Further, the at least one thermal blocking thermotunneling device has a thermal back path of less than about 70 percent.
摘要:
A method for interconnecting high-temperature silicon carbide (SiC) devices enables such high-temperature devices to be used in fabricating electronic circuits of significant scale. This method comprises empirically measuring operational characteristics of a plurality of the devices to be interconnected, the operational characteristics comprising devices which are measured to be non-working and devices which are measured to be working; characterizing the operational characteristics in an operational characteristics map; designing interconnection paths between and among the devices that are characterized to be working by the operational characteristics map; and excluding from the interconnection paths, devices that are characterized to be non-working by the operational characteristics map. A preferred embodiment of this method further includes disposing a temporary polymer layer over the devices; forming via holes through the temporary polymer layer, to bonding pads of the devices; applying a current-balancing resistive metal over the temporary polymer layer; establishing connections between the current-balancing resistive metal and the bonding pads; designing the interconnection paths between and among the working devices by patterning the current-balancing resistive metal based on the operational characteristics map; and removing the temporary polymer layer.