PATENT DOCUMENT

Publication Number: US-10276326-B1
Application Number: US-201615158868-A
Country: US
Kind Code: B1

Title: Illumination systems with light-emitting diodes

Abstract:
An item may have regions that are illuminated by light from a light source. The light source may be based on components such as light-emitting diodes. Diffusing material, luminescent material, and other light-adjusting materials may be incorporate into the item. The item may include movable structures such as movable keyboard key members. Light-emitting diodes may be mounted on a substrate. The substrate may be coupled to keyboard key members, additional substrates, or other structures in an item. The item may include a layer of fabric and layers of other material. Openings in the layers of material may be configured to receive light-emitting diodes. Opaque layers of material may have patterned openings that help define shapes for the illuminated regions.

Claims:
What is claimed is: 
     
       1. A keyboard, comprising:
 an array of key members; 
 a layer of material that overlaps the array of key members and extends across the keyboard, wherein the layer of material has a light-transmitting region over a respective one of the key members; 
 a light-emitting diode that produces light; and 
 a luminescent material that produces illumination for the light-transmitting region in response to receiving the light from the light-emitting diode. 
 
     
     
       2. The keyboard defined in  claim 1  wherein the layer of material comprises a layer of opaque material having a symbol-shaped opening. 
     
     
       3. The keyboard defined in  claim 1  wherein the layer of material comprises a layer of fabric. 
     
     
       4. The keyboard defined in  claim 1  wherein the light produced by the light-emitting diode comprises ultraviolet light and wherein at least some of the illumination produced by the luminescent material comprises visible light. 
     
     
       5. The keyboard defined in  claim 1  wherein the light produced by the light-emitting diode comprises blue light and wherein at least some of the illumination produced by the luminescent material comprises white light. 
     
     
       6. The keyboard defined in  claim 1  wherein the luminescent material is located in the respective one of the key members. 
     
     
       7. The keyboard defined in  claim 1  wherein the respective one of the key members is movable and wherein the luminescent material comprises a coating on the respective one of the key members. 
     
     
       8. The keyboard defined in  claim 1  wherein the luminescent material comprises a coating on the layer of material. 
     
     
       9. A keyboard, comprising:
 a first substrate; 
 a light-emitting diode on the first substrate that produces light; 
 a layer of material having at least one light-transmitting region that is illuminated by the light, wherein the layer of material comprises fabric and wherein the light-transmitting region has a symbol shape; and 
 a second substrate that overlaps the first substrate. 
 
     
     
       10. The keyboard defined in  claim 9  wherein the first substrate is coupled to the second substrate and wherein the first substrate comprises a layer of polymer. 
     
     
       11. The keyboard defined in  claim 10  further comprising a dome switch mounted to the layer of polymer. 
     
     
       12. The keyboard defined in  claim 11  wherein the second substrate comprises a printed circuit having contacts coupled to signal paths in the first substrate, wherein signals are provided to the light-emitting diode on the first substrate through the signal paths. 
     
     
       13. The keyboard defined in  claim 9  further comprising:
 a switch on the first substrate; and 
 a movable key member that controls the switch, wherein the first substrate is coupled to the second substrate. 
 
     
     
       14. The keyboard defined in  claim 9  further comprising an opaque layer having an opening that is aligned with the light-transmitting region. 
     
     
       15. The keyboard defined in  claim 9  further comprising:
 wireless power transmitter circuitry that transmits wireless power; and 
 wireless power receiver circuitry that receives the transmitted wireless power and that powers the light-emitting diode. 
 
     
     
       16. The keyboard defined in  claim 15  wherein the wireless power transmitter circuitry includes a first inductor coil and wherein the wireless power receiver circuitry includes a second inductor coil that receives the transmitted wireless power. 
     
     
       17. The keyboard defined in  claim 16  wherein the first substrate includes metal traces that form the second inductor coil, wherein the light-emitting diode is coupled to the second inductor coil. 
     
     
       18. The keyboard defined in  claim 15  wherein the wireless power transmitter circuitry includes a light source, wherein the wireless power receiver circuitry includes a light detector coupled to the light-emitting diode, and wherein the light detector receives light from the light source in the wireless power transmitter circuitry. 
     
     
       19. A keyboard, comprising:
 fabric with a light-transmitting region, wherein the light-transmitting region comprises at least first and second holes in the fabric; 
 a keyboard key member formed from a translucent material, wherein the first and second holes in the fabric overlap the keyboard key member; and 
 a light-emitting diode that produces illumination for the light-transmitting region that is diffused by the translucent material. 
 
     
     
       20. The keyboard defined in  claim 19  further comprising a layer of opaque material interposed between the fabric and the keyboard key member, wherein the layer of opaque material has an opening that overlaps the light-transmitting region. 
     
     
       21. The keyboard defined in  claim 20  wherein the opening that overlaps the light-transmitting region comprises a symbol-shaped opening. 
     
     
       22. The keyboard defined in  claim 19  wherein the light-emitting diode comprises a crystalline semiconductor die, the keyboard further comprising:
 a polymer sheet on which the light-emitting diode is mounted. 
 
     
     
       23. The keyboard defined in  claim 22  further comprising a printed circuit board that is coupled to the polymer sheet. 
     
     
       24. The keyboard defined in  claim 19  further comprising a dome switch with a dome that covers the light-emitting diode, wherein the dome has at least one opening through which light from the light-emitting diode passes. 
     
     
       25. A keyboard, comprising:
 a substrate; 
 a light-emitting diode mounted on the substrate; 
 a layer of material having a symbol-shaped light-transmitting region that is illuminated by light from the light-emitting diode, wherein the layer of material extends across the keyboard; and 
 a reflective coating that reflects at least some of the light. 
 
     
     
       26. The keyboard defined in  claim 25  further comprising:
 a switch; and 
 a key member that moves to control the switch. 
 
     
     
       27. The keyboard defined in  claim 26  wherein the reflective coating is on the key member. 
     
     
       28. The keyboard defined in  claim 26  wherein the reflective coating is on the substrate.

Description:
This application claims the benefit of provisional patent application No. 62/270,833, filed Dec. 22, 2015, which is hereby incorporated by reference herein in its entirety. 
    
    
     FIELD 
     This relates generally to illumination, and, more particularly, to systems for providing illumination using light-emitting diodes. 
     BACKGROUND 
     Electronic equipment often contains light-emitting diodes. For example, key labels on keys in a keyboard may be backlit with light from light-emitting diodes. 
     The incorporation of sources of illumination such as light-emitting diodes into keyboards and other items can pose challenges. If care is not taken, key labels or other illuminated regions may not be visible, the efficiency with which illumination is produced may be poor, illuminated structures may not be durable, or illumination systems may bulkier than desired. 
     SUMMARY 
     An item may have regions that are illuminated by light from a light source. The item may have layers of material formed from polymers, fabric, and other materials. The illuminated regions may be formed from transparent windows in opaque layers of material. The transparent windows may include opaque layer openings. Coatings and other materials may overlap the openings. 
     The light source may be based on components such as light-emitting diodes. The light-emitting diodes may be formed from bare semiconductor dies or semiconductor dies mounted on interposers. 
     Light-emitting diodes may be mounted on a substrate. The substrate may be coupled to keyboard key members and other structures, additional substrates, or other structures in an item. 
     Diffusing material, luminescent material, and other light adjusting materials can be incorporate into the item. The item may include movable structures such as movable keyboard key members. For example, the item may be a fabric-covered keyboard having an array of keys. Light-adjusting material may be formed as a coating on a key member, a coating on a layer of material such as a fabric or polymer layer, a portion of a key member or other polymer structure, a polymer substrate or other substrate, or other structure. 
     Openings may be formed in the layers of material in the item and may be configured to receive light-emitting diodes. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of an illustrative item with an illumination system in accordance with an embodiment. 
         FIG. 2  is a cross-sectional side view of illustrative fabric in accordance with an embodiment. 
         FIG. 3  is a cross-sectional side view of a layer such as a fabric layer or polymer layer with an illuminated region in accordance with an embodiment. 
         FIG. 4  is a top view of an illuminated structure such as a keyboard key in accordance with an embodiment. 
         FIG. 5  is a side view of an illustrative light-emitting diode mounted on a substrate in accordance with an embodiment. 
         FIG. 6  is a side view of a portion of an illustrative keyboard with illumination in accordance with an embodiment. 
         FIG. 7  is a cross-sectional side view of a structure such as a keyboard key member, coating layer, substrate, polymer layer, or other structure that includes luminescent material or light diffusing material in accordance with an embodiment. 
         FIG. 8  is a cross-sectional side view of an illustrative substrate such as a polymer layer that has light-emitting diodes and that is mounted to another substrate such as a printed circuit in accordance with an embodiment. 
         FIG. 9  is a cross-sectional side view of an illustrative illumination system structure formed from light-emitting diodes on a substrate covered with one or more layers of material such as luminescent material, diffusing material, and encapsulant in accordance with an embodiment. 
         FIG. 10  is a cross-sectional side view of a portion of an illustrative illumination system where light-emitting diodes have been mounted on a transparent substrate through which light from the light-emitting diodes may pass in accordance with an embodiment. 
         FIG. 11  is a cross-sectional side view of an illustrative layer of material into which a light-emitting diode has been embedded in accordance with an embodiment. 
         FIG. 12  is a cross-sectional side view of an illustrative layer of material having an outer surface and an opposing inner surface with a recess that may receive a light-emitting diode in accordance with an embodiment. 
         FIG. 13  is a cross-sectional side view of an illustrative layer of material having an inner surface and an opposing outer surface with a recess that may receive a light-emitting diode in accordance with an embodiment. 
         FIG. 14  is a cross-sectional side view of an illustrative lighting system structure in which a light-emitting diode is mounted on a substrate and protrudes into a recess in a layer of material or other structure in accordance with an embodiment. 
         FIG. 15  is a cross-sectional side view of a portion of an electrical component such as a keyboard key showing illustrative light-emitting diode mounting locations in accordance with embodiments. 
         FIG. 16  is a cross-sectional side view of an illustrative keyboard key with a wirelessly powered light-emitting diode in accordance with an embodiment. 
         FIG. 17  is a circuit diagram for a wirelessly powered light-emitting diode of the type shown in  FIG. 16  in accordance with an embodiment. 
         FIG. 18  is a circuit diagram of an illustrative optically powered light-emitting diode circuit of that type that may be used for a light-emitting diode in a keyboard key in accordance with an embodiment. 
         FIG. 19  is a cross-sectional side view of an illustrative structure such as a key member having an upper surface with recesses to accommodate light-emitting diodes in accordance with an embodiment. 
         FIG. 20  is a cross-sectional side view of an illustrative structure such as a key member having a lower surface with recesses to accommodate light-emitting diodes in accordance with an embodiment. 
         FIG. 21  is a cross-sectional side view of a portion of an illustrative keyboard with illumination and light reflection structures in accordance with an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Fabric, sheets of plastic, layers of printed circuit material, molded plastic parts, and other structures may be used in forming items with illumination systems. These items, which may sometimes be referred to as fabric-based items or electronic devices, may be provided with illumination systems based on light sources such as light-emitting diodes. The illumination systems may be used to illuminate symbols (sometimes referred to as glyphs) that serve as keyboard key labels, may be used to illuminated labels for other components, or may be used to illuminate other regions of interest in an item (e.g., trim structures, portions of a decorative pattern, portions of a light-based status indicator, etc.). 
     Light-emitting diode illumination systems may be incorporated into electronic devices such as cellular telephones, tablet computers, wrist-watch devices, laptop computers, media players, pendant devices, devices embedded in eyeglasses or other equipment worn on a user&#39;s head, or other electronic equipment, may be used in straps, cases, covers, or other accessories for electronic devices (e.g., a cover or other accessory that includes a keyboard), may be used in accessories such as headphones, may be used in forming straps, pockets, walls in bags, or parts of other enclosures, may be used in forming seating or other furniture for a home or office, may be used in forming a seat, dashboard, steering wheel, seatbelt, or other item in a vehicle, may be used in forming part of embedded systems such as systems in which fabric-based equipment is mounted in kiosks, may be used in forming wearable items such as necklaces, wrist bands, arm bands, shoes, or other items of clothing, may be used in forming wallets or purses, may be used in forming cushions, blankets, or other household items, may be used in forming toys, may be used in forming other equipment with circuitry, or may be used in forming structures that implement the functionality of two or more of these items. 
     Items such as these may include circuitry for supporting input-output features and other functionality. For example, an item may include an illumination system that contains a light source that generates light that is viewable by a user of the item. The light may be used as general purpose illumination (e.g., light to illuminate an interior portion of a bag or other enclosure), may be used as light that illuminates a user&#39;s ambient environment (as with a flashlight), may be used to illuminate a symbol or other patterned structure on the surface of a keyboard or other item (e.g., a keyboard key label), may serve as backlight illumination or per-pixel illumination for a display having an array of individually adjustable pixels, may provide illumination for a status indicator (e.g., a one-element or multi-element battery strength indicator, a wireless signal strength indicator, a power status indicator, or other symbol for a status indicator), may support wireless light-based communications (e.g., with external equipment), and/or may be used in other light-based applications. Arrangements in which the circuitry of an item includes a light source for providing illumination for a light-transmitting region such as a symbol (glyph) on a keyboard key (e.g., a keyboard key label or other label, etc.) or other pattern may sometimes be described herein as an example. This is, however, merely illustrative. Arrangements in which illumination systems are incorporated into the circuitry of other types of items (e.g., other suitable structures having illuminated symbols and other light-transmitting regions) and in which other types of illumination are generated may be used, if desired. 
     An illustrative arrangement for an item that includes circuitry with one or more light sources is shown in  FIG. 1 . Item  10  may be a fabric-based item such as a fabric-covered keyboard or other item that includes fabric or may be an item that does not include fabric. In configurations in which item  10  includes fabric, the fabric for item  10  may form all or part of a housing wall for item  10 , may form internal structures for item  10 , may form surface structures for item  10 , or may form other fabric-based structures. The fabric of item  10  may be soft (e.g., item  10  may have a fabric surface that yields to a light touch), may have a rigid feel (e.g., the surface of item  10  may be formed from a stiff fabric), may be coarse, may be smooth, may have ribs or other patterned textures, and/or may be formed as part of a structure that has portions formed from non-fabric structures of plastic, metal, glass, crystalline materials, ceramics, or other materials. 
     Item  10  may have control circuitry  16 . Control circuitry  16  may include storage and processing circuitry for supporting the operation of item  10 . The storage and processing circuitry may include storage such as hard disk drive storage, nonvolatile memory (e.g., flash memory or other electrically-programmable-read-only memory configured to form a solid state drive), volatile memory (e.g., static or dynamic random-access-memory), etc. Processing circuitry in control circuitry  16  may be used to control the operation of item  10 . The processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors and other wireless communications circuits, power management units, audio chips, application specific integrated circuits, etc. 
     Input-output circuitry in item  10  such as input-output devices  18  may be used to allow data to be supplied to item  10  and to allow data to be provided from item  10  to external devices. During operation, control circuitry  16  may use input-output devices  18  to gather input from a user, external equipment, and/or the environment around item  10 . Control circuitry  16  may also use input-output devices  18  to provide output to a user or external equipment. 
     Input-output devices  18  may include switches, buttons, joysticks, scrolling wheels, touch pads, key pads, keyboards, microphones, speakers, tone generators, vibrators, cameras, sensors such as touch sensors, capacitive proximity sensors, light-based proximity sensors, ambient light sensors, compasses, gyroscopes, accelerometers, moisture sensors, force sensors, data ports, displays, and other input-output devices. Keys, buttons, status indicators, displays, trim structures, and other portions of item  18  may be illuminated. For example, light-emitting diodes, lamps, electroluminescent panels, or other sources of light may be used in illuminating patterned openings. The patterned openings may pass through layers of fabric and/or other materials in item  10  and may form symbols (e.g., letters and other alphanumeric characters, icons, etc.) or other illuminated shapes. The symbols or other patterned openings may form labels on keys, buttons, or other input-output devices, may form labels on other illuminated structures, may form trim for a component (e.g., a halo surrounding a key), or may form other suitable illuminated areas. In some arrangements, transparent material (e.g., clear material, translucent material, and/or material that includes electroluminescent substances such as phosphors) may be formed in an opening and/or may overlap and opening. Light-transmitting windows in opaque structures may be formed from openings and optional transparent material overlapping the openings. 
     Arrangements in which patterned openings or other transparent structures in one or more layers in item  10  are used in forming illuminated letters or other symbols that serve as labels for input-output components such as keys and buttons may sometimes be described herein as an example. In general, however, input-output devices  18  may include one or more light sources that provide any suitable type of illumination for item  10 . 
     Fabric for item  10  may be formed from intertwined strands of material. A cross-sectional side view of an illustrative layer of fabric for item  10  is shown in  FIG. 2 . As shown in  FIG. 2 , fabric  20  may include strands of material such as strands  22  and strands  24 . With one suitable arrangement, fabric  20  may be a woven fabric (e.g., strands  22  may be warp strands and strands  24  may be weft strands). Other arrangements may be used for intertwining strands of material for forming fabric  20  for item  10 , if desired. In general, fabric  20  may be woven, knitted, braided, may be intertwined to form felt, or may contain strands of material that have been intertwined using other intertwining techniques. In some arrangements, fabric  20  may include coatings (e.g., polymer coatings to prevent accumulation of dirt, materials that serve as moisture barrier layers, wear resistant coatings, transparent coatings such as patterned translucent coatings, etc.). These coating materials may penetrate into fabric  20  and/or may form layers on the inner and/or outer surfaces of fabric  20 . 
     The strands of material that form the fabric may be monofilaments, may be multifilament strands (sometimes referred to herein as yarns or threads), may be formed from metal (e.g., metal monofilaments and/or yarns formed from multiple monofilament wires), may be formed from dielectric (e.g., polymer monofilaments and yarns formed from multiple polymer monofilaments), may include dielectric cores covered with conductive coatings such as metal (e.g., metal coated dielectric monofilaments and yarns of metal coated polymer-core monofilaments may be used to form conductive monofilaments and conductive yarns, respectively), may include outer insulating coatings (e.g., coatings of polymers or other dielectrics may surround each metal-clad polymer monofilament or each collection of metal-clad polymer monofilaments in a yarn, polymer insulation may enclose a multifilament metal wire, etc.), or may be other suitable strands of material for forming fabric. 
     As shown in the illustrative configuration of fabric  20  of  FIG. 2 , for example, strands such as strands  22  and  24  may be formed from strands of yarn that each contain multiple monofilaments  26 . Configurations in which the fabric is formed from yarns (e.g., multifilament strands of material that are insulating or that contain metal wires and/or metal coatings on polymer monofilaments to render the yarns conductive) may sometimes be described herein as an example. This is, however, merely illustrative. Fabric  20  may be formed using monofilaments, multifilament strands of material (yarns), combinations of these arrangements, etc. The diameter of strands  22  and  24  that are formed from yarns containing multiple monofilaments may be, for example, 0.25 mm, may be 0.1 to 0.5 mm, may be more than 0.2 mm, may be less than 2 mm, or may be any other suitable diameter (width). 
     To allow light to pass through a layer formed from fabric and/or other materials in item  10 , the layer of material in item  10  may be provided with transparent regions. The transparent regions may be formed from air-filled openings in opaque fabric and/or other opaque materials, may be formed from openings that are filled with transparent material (e.g., haze-free clear material or hazy translucent material, transparent fabric, or other transparent material), or may be formed from other structures that allow light to pass. In some configurations, an opaque fabric coating layer or other opaque layer (e.g., a layer of black ink on a key member or other structure) may be provided with a patterned opening in addition to or instead of providing fabric  20  with patterned openings. Combinations of these approaches and/or other arrangements for providing illuminated structures in item  10  may be used, if desired. 
     A side view of an illustrative item having a layer of material such as a fabric layer or other layer with an opening is shown in  FIG. 3 . As shown in  FIG. 3 , a viewer such as viewer  30  may view exterior surface  34  of item  10  in direction  32 . Item  10  may include a layer material such as layer  20  that forms outer surface  34 . Layer  20  may include one or more layers of fabric or other materials (e.g., layer  20  may be a layer of fabric and/or may have other layers of material such as plastic layers or other layers of material, and/or other structures). A light source such as light source  40  may be formed in the interior of item  10 . Light source  40  may be formed from one or more light-emitting diodes (e.g., organic light-emitting diodes, light-emitting diode dies formed from crystalline semiconductor, quantum dot light-emitting diodes, light-emitting diodes with phosphors, etc.) or may be formed from other light-emitting structures. With one illustrative configuration, which may sometimes be described herein as an example, light sources for item  10  such as light source  40  may be formed from micro-light-emitting diodes (e.g., small crystalline light-emitting diodes having dimensions of 100 microns or less, 200 microns or less, 20-200 microns, more than 10 microns, less than 500 microns, or other suitable size). Other types of light-emitting device (e.g., lasers, electroluminescent panels, etc.) may be used in providing illumination for item  10  if desired. The use of micro-light-emitting diodes for forming light source(s)  40  is merely illustrative. Light sources for item  10  may generate light at visible wavelengths, infrared wavelengths, and/or ultraviolet wavelengths (see, e.g., light  42  of  FIG. 3 ). If desired, luminescent material (e.g., phosphors formed from phosphorescent materials, fluorescent dyes, a polymer or other material containing quantum dots, etc.) may be used in converting light to desired wavelengths. 
     Layer  20  may have openings such as opening  44 . Opening  44  (or a set of openings such as opening  44 ) may have the shape of an alphanumeric character or other symbol (glyph), may serve as a label for a component or other label or trim, or may have any other suitable shape. As shown in  FIG. 3 , opening  44  (i.e., the symbol, label, or other patterned structure formed from opening  44  or set of openings  44 ) may be illuminated with illumination  42  (i.e., illumination  42  may serve as backlight for an illuminated area formed from opening  44 ). Because opening  44  may have a shape that forms a symbol or other desired pattern, openings such as opening  44  of  FIG. 3  may sometimes be referred to as patterned openings or illuminated regions. 
     Openings such as opening  44  of  FIG. 3  may be formed by stamping (punching), cutting, machining, plasma cutting, waterjet cutting, heating, ablation, chemical removal (e.g., polymer dissolving techniques, metal etching techniques, etc.), laser-based techniques (sometimes referred to as laser hole formation or laser drilling), and/or other suitable material removal techniques. Openings such as opening  44  may also be formed during the process of fabricating some or all of layer  20  (e.g., by molding openings into layer  20  as layer  20  is formed during a plastic molding process, by intertwining strands of material so that openings are formed as layer  20  is constructed, or by using other fabrication techniques in which openings such as opening  44  are formed during fabrication of layer  20  rather than by removing material from layer  20  after layer  20  has been fabricated). 
     Patterned openings in fabric and/or other materials (see, e.g., layer  20  of  FIG. 3 ) may be used in forming illuminated regions in item  10 . As shown in  FIG. 4 , layer  20  may overlap an input-output component such as key  50 . Key  50  may form part of a keyboard in item  10  (e.g., item  10  may be an accessory such as a cover that contains a keyboard or other device that contains keys). Key  50  may be surrounded by an illuminated region such as region  44 A that forms an illuminated trim (i.e., an illuminated ring-shaped halo that runs around the periphery of key  50 ). Key  50  may also have an illuminated region such as region  44 B. Region  44 B may form a symbol or other pattern. For example, illuminated region  44 B may form a label for key  50  (e.g., region  44 B may be patterned to form an alphanumeric character such as the letter “A” or other symbol associated with the operation of the key). Regions such as regions  44 A and  44 B may be formed from transparent portions of an opaque layer (e.g., perforations or larger openings in a fabric or other material that are filled with transparent material, air-filled openings, etc.). In some configurations, printed ink or other coating material may be provided on layer  20  (e.g. on the outer surface of layer  20 ) to help make a label on key  50  visible to a user in the absence of illumination through regions  44 A and/or  44 B. 
     Although illustrative illuminated regions  44 A and  44 B of  FIG. 4  are associated with an input-output device in item  10  such as key  50 , this is merely an example. Regions such as regions  44 A and  44 B may have any suitable size and shape, may be formed on any suitable portion of item  10 , may form labels, symbols, text, decorative patterns (e.g., trim), parts of status indicators, parts of displays, parts of buttons (e.g., buttons such as power buttons, volume buttons, sleep/wake buttons, and other buttons besides the keys in a keyboard), may be formed on surfaces of item  10  that are not associated with keys, etc. The illuminated key configuration of  FIG. 4  is merely an example. 
     Light-emitting diodes for item  10  may include bare dies and/or dies that have been mounted on small pieces of substrate material (e.g., small printed circuit board carriers, which may sometimes be referred to as interposers). Bare light-emitting diode dies and/or light-emitting dies on interposers may be mounted on other substrates. Examples of layers of material that may serve as substrates for light-emitting diodes in item  10  include fabric layers, layers of printed circuit material (e.g., rigid printed circuit board material such as fiberglass-filled epoxy and flexible printed circuit material such as sheets of polyimide or other flexible polymer layers), and polymer sheets such as sheets of polyethylene terephthalate (PET). Light-emitting diodes may also be mounted on molded plastic carriers, on machined dielectric structures, or other structures in item  10 . 
     An illustrative light-emitting diode is shown in  FIG. 5 . As shown in  FIG. 10 , light-emitting diode  40  may be formed from a crystalline semiconductor die (e.g., a semiconductor die formed from a semiconductor such as indium gallium nitride or other suitable semiconductor material). Light-emitting diode  40  may emit light  42  from its upper surface, lower surface, and/or edge surfaces. Optional coating layers such as layer  150  may be formed on these surfaces. Coating  150  may be formed from a luminescent material. For example, coating  150  may include materials such as phosphors (e.g., YAG phosphors) to down convert light  42  (e.g., blue light) to produce white light. Coating  150  may also include other materials that affect light  42  (e.g., quantum dots that convert blue light to red and/or green light or light of other colors), fluorescent material that converts ultraviolet light from diode  40  into visible light, dyes or pigments that affect the color of light  42 , etc. In the example of  FIG. 5 , these materials have been included as optional coating  150 . If desired, luminescent materials or other materials such as the materials of coating  150  may be incorporated into solid plastic structures in item  10 , coatings on key structures, coatings on layer  20  (e.g., fabric), or may be incorporated into other structures in item  10 . 
     As shown in  FIG. 5 , light-emitting diode  40  may have terminals such as contacts  152 . When current is applied to diode  40  through contacts  152 , light  42  is emitted by light-emitting diode  40 . Light-emitting diode  40  may be mounted to a substrate such as substrate  154 . Substrate  154  may have signal paths such as signal paths  156 . Signal paths  156  may be formed in interior layers of substrate  154  (e.g., when substrate  154  is a printed circuit board) and/or on external surfaces of substrate  154  (e.g., when substrate  154  is a plastic film without any internal signal paths). Portions of signal paths  156  may form contacts  158 . Solder or other conductive material  160  may be used to couple light-emitting diode contacts  152  to contacts  158 . If desired, contacts  162  may be formed on substrate  154  that allow substrate  154  to be mounted to a printed circuit or other additional substrate in item  10 . For example, substrate  154  may be a relatively small interposer substrate on which light-emitting diode  40  (and, if desired, additional semiconductor device(s)) may be mounted. A light-emitting diode of this type (i.e., a light-emitting diode that includes a semiconductor die mounted on an interposer) may be incorporated into item  10  in place of or in addition to incorporating bare light-emitting diode dies into item  10 . Configurations in which light-emitting diodes  40  are packaged light-emitting diodes or are formed from thin-film organic light-emitting diode structures may also be used. 
     A cross-sectional side view of a portion of item  10  in a configuration in which item  10  is an accessory such as a cover for a tablet computer or other electronic device and contains a keyboard is shown in  FIG. 6 . As shown in  FIG. 6 , item  10  may have a plastic key member support structure (sometimes referred to as a key web) such as structure  106 . A plurality of keys  100  may be formed in item  10 . Each key  100  may have a moving key member  70  that is moves in directions  94  and  96  within a respective opening  108  in structure  106 . Lip portions  70 ′ of key members  70  and corresponding lip portions  106 ′ of structure  106  may serve as stop structures that help retain key members  70  within openings  108 . 
     Dome switch  104  and, if desired, spring structures may help bias key member  70  in direction  94  when key  100  is not pressed. When key  100  is pressed, the inward force exerted by a user&#39;s finger will press key member  70  in inwards direction  96 , thereby compressing and activating dome switch  104 . Structure  106  may have an array of openings  108  to receive an array of associated key members  70  and an array of corresponding dome switches  104  may be mounted under key members  70 . Flexible layer  20  (e.g., a fabric layer) may cover key members  70  and may be attached to structure  106  and key members  70  using adhesive  90 . 
     Layer  20  may contain a layer of fabric or other material with a light-transmitting region formed from opening(s)  44  and/or other structures. The light-transmitting region may form a desired illuminated symbol, label, or other structure for key  100 . Coating  84  may be transparent material (translucent, clear, colored, luminescent—i.e., fluorescent or phosphorescent, etc.) and may have an appearance that contrasts visually with the appearance of layer  20 . Coating  84  may extend into openings  44  and may have a shape that represents a symbol, label, etc. The shape formed by coating  84  may allow a user to identify key  100  even in the absence of illumination  42 . Optional protective layer  86  may be sufficiently transparent to allow a user to view the pattern formed by coating  84  and the pattern of illumination formed when light  42  passes through the transparent region formed from opening(s)  44 . The illuminated transparent region formed from openings  44  may include perforations and/or larger symbol-sized openings. If desired, a halo structure such as halo  44 A of  FIG. 4  (e.g., an illuminated ring shape or other trim pattern) may surround each key  100 . 
     Adhesive  110  may be used to attach key member support structure  106  to a substrate such as printed circuit  102 . Printed circuit  102  may be a rigid printed circuit board or a flexible printed circuit (e.g., a printed circuit formed from a flexible polymer substrate such as a layer of polyimide or other sheet of polymer). Configurations in which substrate  102  is a layer of polymer having upper and lower surfaces on which metal traces are formed (and being free of embedded metal traces) may also be used. Light-emitting diodes  40  may be mounted to printed circuit board (substrate)  102  within openings  108  adjacent to dome switch  104  to provide illumination  42  or may be mounted elsewhere within item  10 . 
     As shown in  FIG. 7 , light  42  in item  10  may pass through transparent structures such as structure  164 . Structure  164  may be a key member such as member  70 , may be a fabric (e.g., layer  20 ), a layer of non-fabric material such as a polymer layer (e.g., layer  20 , substrate layer  102 , other substrate layers, etc.), a support structure, a coating such as coating  84 , an adhesive material, and/or other suitable structures in item  10 . In some configurations for item  10 , structures such as structure  164  may be clear (e.g., transparent and haze free). If desired, structure  164  may contain metal oxide particles or other light scattering particles that impart a haze to structure  164  and render structure  164  translucent (light diffusing). Structures in item  10  such as illustrative structure  164  of  FIG. 7  may also include luminescent material (e.g., phosphorescent material such as YAG particles or other phosphors, fluorescent dyes or pigments, quantum dots, etc.). In configurations such as these, light from diode  40  of one color may be converted into light  42  of a different color and/or may exhibit glow-in-the dark (persistent luminescence) properties as light  42  passes through structure  164 . Light-emitting diode  40  may, if desired, emit ultraviolet light that is converted into visible light of a desired wavelength using luminescent material (e.g., fluorescent dye or pigment). Luminescent materials such as phosphors, fluorescent materials, diffusing structures such as light scattering particles of metal oxides and other materials, and other light-modifying structures  164  (e.g., gratings, textured surfaces, bubbles and other voids, colored layers, etc.) may be used to help convert light to a desired color and to diffuse light  42 , as shown in  FIG. 7 . These light-adjusting structures may help reduce undesired hotspots in an illuminated region and may ensure that an illuminated region is visible to a user of item  10 . 
     Illustrative illumination system structures of the type that may be used in providing illumination for opening  44  of key  100  of  FIG. 6  are shown in  FIG. 8 . As shown in  FIG. 8 , light-emitting diodes  40  (bare, on an interposer, or packaged) may be mounted on a substrate that is, in turn, mounted on a support structure such as another substrate. In the example of  FIG. 8 , light-emitting diodes  40  and dome switch  104  for keyboard key  100  have been mounted on the upper surface of substrate  166 . Substrate  166  may be attached to a structure such as printed circuit  102  via adhesive layer  168  or may be otherwise coupled to printed circuit  102  (e.g., using solder, connectors, etc.). Vias such as via  170  in substrate  166  may allow signals associated with light-emitting diodes  40  and switches such as switch  104  to be routed to contacts  172  and other signal paths in substrate  102 , which is coupled to substrate  166 . 
     Adhesive layer  168  may be omitted and other attachment mechanisms such as screws and other fasteners, connectors, and other structures may be used in coupling substrates  166  and  102  together. If desired, components such as components  174  (e.g., integrated circuits associated with keyboard key signal processing, light-emitting diode control, etc.) may be mounted on substrate  102 . Substrate  166  may be, for example, a polymer layer such as a layer of polyethylene terephthalate (PET). Pieces of the PET material or other polymer may be cut into rectangles or pieces of other shapes and each of these pieces of substrate  166  may be mounted within a respective keyboard key (as an example). 
     Signal traces may be formed on the upper and/or lower surfaces of substrate  166  (as an example). Substrate  102  may be a rigid or flexible printed circuit and may include multiple sublayers. Configurations in which substrate  166  is a printed circuit board and in which structure  102  is a key member or other structural component of item  10  may also be used, if desired. The configuration of  FIG. 8  is merely illustrative. The configuration of  FIG. 8  may be used in a key of the type shown in  FIG. 7  or other component within item  10 . 
     As shown in  FIG. 9 , layers of material such as layers  176  may overlap light-emitting diodes  40 . In the example of  FIG. 9 , light-emitting diodes  40  are mounted on substrate  184  (e.g., a polymer layer, a fabric layer, a printed circuit, a key member or other structure in item  10 , etc.). Layers  176  may include layers such as layers  182 ,  180 , and  178 . Layer  182  may be a luminescent material (e.g., a phosphor, a fluorescent material, a dye or pigment that imparts a color, etc.). Diffusing layer  180  may include light-scattering features (voids, particles, etc.) that help diffuse light emitted by diodes  40 , as described in connection with  FIG. 7 . Encapsulant  178  may be formed from a clear polymer and/or inorganic layer that helps protect light-emitting diodes  40  and layers  180  and  182  from moisture. If desired, fewer layers  176  may be used to cover diodes  40  and/or the functions of layer  176  of  FIG. 9  may be combined into one, two, or more than two different layers. As an example, a single-layer coating may include luminescent material, light-scattering particles, and encapsulant material. 
       FIG. 10  shows how light-emitting diodes  40  may be mounted on the lower (inner) surface of structure  184 . In this type of configuration, structure  184  may be transparent to allow light  42  to travel through structure  184 . Coating(s)  176  may be formed on the upper (outer) surface of structure  184 . If desired, luminescent material, colored materials, and/or other materials such as light-diffusing materials and/or structures may be incorporated into layer  184 . Structure  184  may be a dielectric substrate such as a polymer layer such as a PET layer, a printed circuit substrate (flexible or rigid), a key member such as key member  70 , a fabric layer or other layer such as layer  20  of  FIG. 6 , or other structure in item  10 . 
     As shown in  FIG. 11 , light-emitting diode  40  may be embedded within the interior of structure  184  or other structures in device  10 . In the configuration of  FIG. 11 , structure  184  may be a substrate such as a polymer layer (e.g., a PET layer or other polymer sheet), a printed circuit (flexible or rigid), a key member such as key member  70 , a fabric layer or other layer such as layer  20  of  FIG. 6 , or other structure in item  10 . Strands of conductive material (e.g., conductive monofilaments or conductive threads in a fabric) or other conductive signal paths  186  may be coupled to the contacts of light-emitting diode  40  using solder, conductive adhesive, clamps, or other suitable conductive coupling mechanisms. In the example of  FIG. 12 , light-emitting diode  40  has been mounted in a recess (recess  188 ) in the lower surface of structure  184 . In the example of  FIG. 13 , light-emitting diode  40  has been mounted in a recess (recess  188 ) in the upper surface of structure  184 . If desired, light-emitting diode  40  may have an outer surface that lies flush with the outer surface of structure  184 , as shown in the illustrative configurations of  FIGS. 12 and 13 . 
     As illustrated in the configuration of  FIG. 14 , light-emitting diodes may be mounted on a substrate or other structure so that some or all of the light-emitting diodes protrude into a recess or other opening in an adjacent substrate or other structure. In the example of  FIG. 14 , light-emitting diode  40  is mounted to a structure such as structure  192  (e.g., a substrate such as a polymer layer, a printed circuit, etc.) and protrudes into recess  196  in structure  194 . Adhesive  190  or other attachment mechanisms may be used in coupling structure  194  to structure  192 . Structure  194  may be a key member such as key member  70 , may be a fabric or other layer such as layer  20 , may be a printed circuit board substrate, may be a substrate formed from a polymer sheet such as a PET layer, or may be any other suitable structure with recesses in item  10 . Light  42  from diode  40  may propagate through structure  194  and/or through substrate  192 . Structure  194  and/or substrate  192  may include light-scattering materials, luminescent materials, colored materials, and/or other light modifying materials and/or structures. 
     Illustrative locations at which light-emitting diodes  40  may be incorporated into input-output devices such as key  100  in item  10  are shown in  FIG. 15 . As shown in  FIG. 15 , light-emitting diodes  40  may be incorporated into key  100  on an outer surface of layer  20 , in recesses in the outer surface of layer  20 , in the interior of layer  20 , in recesses in the inner surface of layer  20 , on the lower (inner) surface of layer  20 , on the outer surface of key member  70 , in recesses in the outer surface of key member  70 , within the interior of key member  70 , in recesses on the inner surface of key member  70 , on the inner (lower) surface of key member  70  facing substrate  102 , on the outer (upper) surface of substrate  102 , under the dome of dome switch  104 , or in recesses in the upper surface of substrate  102 . In each of these illustrative locations and/or in other suitable locations in which diodes  40  are mounted in item  10 , diode  40  may be a bare die, a bare die mounted on a printed circuit substrate (i.e., a printed circuit interposer), or a packaged light-emitting diode die, and/or may be mounted on a polymer layer such as a PET sheet or other dielectric substrate. Dome  104  may have openings such as openings  75  to allow light  77  from light-emitting diode  40  under dome  104  to emit light. Openings  75  may be slits, dots, or openings of other shapes that allow light to exit from under dome  104  and that may help scatter and diffuse light  77 . Light may also be diffused when passing through the material of a switch housing or other support structures associated with key  100 . As shown in  FIG. 15 , key  100  may be supported by planar key support structure  73  and/or key support structure  71 . Structures such as structure  71  may also serve as housings for dome switch  104 . Structures such as structures  71  and  73  may be formed from translucent plastic, plastic with one or more perforations or other openings, or other material that allows light to be pass and to be diffused (see, e.g., light  81  from a light-emitting diode  40  that is being diffused while passing through structures  71  and/or  73 , and light  79  from a light-emitting diode  40  that is being diffused while passing through a wall of structure  71 . 
     If desired, radio-frequency signal coupling techniques may be used to wirelessly power light-emitting diodes  40 . This may allow diodes  40  to be mounted on a key member or other portion of item  10  in which diodes  40  move relative to a power source. An illustrative arrangement in which wireless power transfer techniques of this type have been used to power light-emitting diode  40  is shown in  FIG. 16 . As shown in the example of  FIG. 16 , wireless power receiving coil  202  may be an inductor formed from multiple loops of metal traces on substrate  204  (e.g., a polymer layer such as a PET layer, a printed circuit substrate, etc.). Light-emitting diodes such as diode  40  may also be mounted on substrate  204 . Substrate  204  may be mounted on key member  70  and may be covered with layer  206  (encapsulant, light-diffusing material, luminescent material such as phosphorescent or fluorescent material, etc.). As with layer  20  in the other keyboard arrangements described herein, layer  20  of  FIG. 16  may be molded or otherwise preformed (e.g., using heat and pressure) to form the shape of keys  100  and may overlap key member  70 . Key member  70  may be used to control dome switch  104  on substrate  102 . Wireless power transmitting coil  200  may be formed from loops of metal traces on substrate  102 . Coils  200  and  202  are electromagnetically coupled (e.g., inductively coupled) so that power may be wirelessly transferred from coil  200  to coil  202  to power light-emitting diode  40 . 
     A circuit diagram for an illustrative wireless power transfer circuit is shown in  FIG. 17 . Wireless power transmitter circuit  220  has a power source such as source  210  that supplies signals to transmission coil  200 . This causes electromagnetic signals such as alternating current (AC) signals  208  to be received by nearby coil  202  in wireless power receiver circuit  222 . Diode  40  rectifies the AC signals received by coil  202  and emits light  42 . If desired, a flexible printed circuit or other cable such as cable  230  of  FIG. 16  may be used to provide current to light-emitting diodes  40  to power light-emitting diodes  40  in addition to or in place of wireless power transfer circuits such as the circuits of  FIG. 17 . Cables such as cable  230  of  FIG. 16  may be coupled to substrate  102 , other printed circuits in item  10  that include power lines, etc. 
     A circuit diagram for an illustrative light-based wireless power transfer circuit is shown in  FIG. 18 . With this type of arrangement, wireless power transmitter circuit  224  has a light source such as light-emitting diode  214  that is supplied with current from power source  212 . This causes light-emitting diode  214  to emit light  216  (e.g., infrared light) that is received by light detector (photodiode)  218  of light-based wireless power receiver circuit  226 . The power produced by the received light at light detector  218  may be used to drive light-emitting diode  40  of circuit  226 , thereby producing light  42 . 
     In the illustrative configuration of  FIG. 19 , item  10  includes a structure such as key member  70  of key  100  that has recesses  232  into which light-emitting diodes  40  may protrude. Light-emitting diodes  40  may be mounted on substrate  236  (e.g., a polymer layer such as a PET layer, a printed circuit, etc.). Layers of material such as layers  234  and  238  may be interposed between substrate  236  and member  70  and between substrate  236  and layer  20 , respectively. Layers  234  and  238  may include adhesive, luminescent material (e.g., fluorescent material, phosphors, etc.), transparent material for encapsulation and hole filling, opaque material (e.g., patterned black ink for forming a desired illuminated shape), colored material, etc. Light  42  from light-emitting diodes  40  may pass upwards directly through layer  20  (e.g., through symbol shaped openings or other illuminated regions in layer  20 ) and/or may be reflected through layer  20  after passing through some or all of key member  70 . Key member  70  may be formed from transparent plastic and/or other materials and may include luminescent material (e.g., fluorescent material, phosphors, etc.), translucent material, and/or other light-adjusting structures. 
       FIG. 20  shows how structures such as keys  100  in item  10  may be provided with reflective layers. In the example of  FIG. 20 , member  70  is transparent. Light-emitting diodes  40  are mounted on substrate  242  and protrude into recesses  240  in member  70 . An opaque layer such as layer  248  (e.g., a layer of black ink) may have openings  44  with the shape of a symbol or other shape. Openings  44  in layer  248  along with any overlapping openings in a fabric or other layer  20  may form light-transmitting regions for keys  100 . Light  42  from light-emitting diodes  40  may pass through openings  44  and other layers in the light-transmitting regions to illuminate the light-transmitting regions (e.g., a symbol that serves as a key label). 
     Reflective coatings such as reflective layers  244  and  246  may be formed on the surfaces of key member  70  (e.g., the upper and lower surfaces of key member  70 , the edges of key member  70 , etc.). The reflective coating material on key member  70  may help reflect stray light  42  from light-emitting diodes  40 , thereby enhancing the efficiency with which light  42  passes through openings  44  in opaque layer  248 . Reflective coatings such as layers  246  and  244  may have openings aligned with openings  44  in opaque layer  248  and recesses  240 , respectively. Layers  246  and  244  may be formed from a reflective stack of alternating high and low index-of-refraction dielectric materials, may be formed from white ink (e.g., a polymer with titanium dioxide particles or other white particles), may be formed from metal, or may be formed from other reflective material. 
     In the illustrative arrangement of  FIG. 21 , light-emitting diodes  40  have been mounted to layer  20  (e.g., by coupling contacts in diodes  40  to conductive strands of material in a fabric in layer  20 , by coupling contacts in diodes  40  to metal traces on a polymer layer or other layer in layer  20 , etc.). If desired, light-emitting diodes  40  may be embedded within layer  20  or may be formed within recesses in layer  20 . Layer  20  may be a fabric layer or may be formed from other materials (e.g., a sheet of PET or other polymer, etc.). Optional protective coating layer  86  may be formed over the exterior surface of layer  20 . Transparent regions in layer  20  (e.g., transparent portions of fabric, clear plastic structures, air-filled openings, or other transparent structures) may have the shape of symbols or other shapes and may be illuminated by light  42  that is emitted by light-emitting diodes  40 . A patterned layer of black ink or other opaque material may be incorporated into layer  20  to help define the light-transmitting shape that is illuminated by light  42 . 
     Key member  70  may be received within an opening in support structure  106 . During operation, key member  70  may be used to control a switch such as dome switch  104  on substrate  102 . To help recycle light  42  that has been emitted by light-emitting diodes  40  and thereby enhance efficiency, reflective structures may be formed within key  100 . As shown in  FIG. 21 , for example, the inner surface of key member  70  may be covered with reflective coating  250  to help reflect light  42  outwards through light-transmitting regions in layer  20 . If desired, the upper surface of substrate  102  may also be covered with reflective material such as reflective layer  252  to help reflect light  42  upwards and out of key  100 . Layer  252  may be a white layer (e.g., a white reflective polymer layer such as white coverlay on a printed circuit board), may be a reflective metal layer, may be a reflector formed from alternating high and low index-of-refraction materials, or may be formed from other reflective structures. Layer  250  may be a may be a white layer such as a white polymer layer, may be a metal layer, may be a reflector formed from alternating high and low index-of-refraction materials, or may be formed from other reflective structures. 
     As with the other illustrative arrangements for item  10 , the structures of  FIG. 21  and, if desired, additional layer(s) of material in item  10  may include luminescent material (e.g., phosphors or fluorescent material) for adjusting the appearance of light  42  and any light-transmitting regions illuminated by light  42 , may include light-diffusing structures (e.g., one or more layers of polymer that include light-scattering features such as voids, inorganic light-scattering particles, other light-scattering structures, dyes, pigments, etc.), colored material, transparent material such as clear haze free polymer for encapsulating sensitive components, etc. 
     The foregoing is merely illustrative and various modifications can be made by those skilled in the art without departing from the scope and spirit of the described embodiments. The foregoing embodiments may be implemented individually or in any combination.

Metadata:
Filing Date: 20160519
Publication Date: 20190430
Grant Date: 20190430
Priority Date: 20151222
Inventors: WANG, PAUL X.
LEONG, Craig C.
RUSCHER, JOEL N.
NASIRI MAHALATI, REZA
TAN, LIQUAN
Assignee: APPLE INC
CPC Classifications: [{"code": "H05B47/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05B47/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01L25/0753", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2203/0085", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2215/004", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2203/01", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/036", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01L25/0753", "inventive": false, "first": false, "tree": "[]"}, {"code": "H02J50/10", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "F21V23/003", "inventive": true, "first": false, "tree": "[]"}, {"code": "H02J50/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "F21V7/22", "inventive": true, "first": false, "tree": "[]"}, {"code": "F21K2/00", "inventive": true, "first": false, "tree": "[]"}, {"code": "H05B37/0227", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01H13/83", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01L33/483", "inventive": true, "first": false, "tree": "[]"}, {"code": "H01H2219/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "F21V23/003", "inventive": true, "first": false, "tree": "[]"}, {"code": "H02J50/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "F21V7/22", "inventive": true, "first": false, "tree": "[]"}, {"code": "H10H20/8514", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10H20/857", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10H20/857", "inventive": false, "first": false, "tree": "[]"}, {"code": "H10H20/8514", "inventive": false, "first": false, "tree": "[]"}, {"code": "F21K2/00", "inventive": true, "first": true, "tree": "[]"}, {"code": "H05B47/165", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H13/83", "inventive": true, "first": false, "tree": "[]"}, {"code": "F21K2/00", "inventive": true, "first": true, "tree": "[]"}, {"code": "H05B47/165", "inventive": false, "first": false, "tree": "[]"}]
Family ID: 66248404