PATENT DOCUMENT

Publication Number: US-10879019-B2
Application Number: US-201816220506-A
Country: US
Kind Code: B2

Title: Light-emitting assembly for keyboard

Abstract:
A light-emitting assembly positioned within a switch housing of a keyboard assembly for an electronic device is disclosed. The light-emitting assembly may include a phosphor structure, a transparent material positioned on opposing side surfaces of the phosphor structure, and an epoxy layer formed over an entire back surface of the phosphor structure and the transparent material. The light-emitting assembly may also include a mask layer formed over an entire top surface of: the phosphor structure, the transparent material, and the epoxy layer. The light-emitting assembly may further include a light source positioned within the phosphor structure for emitting a light.

Claims:
What is claimed is: 
     
       1. A keyboard, comprising:
 a substrate; 
 a tactile dome positioned above the substrate; 
 a keycap positioned above the tactile dome and configured to move when pressed; 
 a light-emitting assembly electrically connected to the substrate, the light-emitting assembly comprising:
 a light source; 
 an opaque material defining a first side of the light-emitting assembly, wherein light from the light source is prevented from passing through the opaque material; 
 a luminescent structure at least partially enclosing the light source and defining second, third, and fourth sides of the light-emitting assembly, at least one of the second, third, and fourth sides being positioned opposite the first side; and 
 wherein light from the light source is directable through the second, third, and fourth sides of the light-emitting assembly to illuminate the keycap. 
 
 
     
     
       2. The keyboard of  claim 1 , wherein the second, third, and fourth sides are orthogonal to each other. 
     
     
       3. The keyboard of  claim 1 , wherein the second, third, and fourth sides are laterally facing relative to an axis of movement of the keycap. 
     
     
       4. The keyboard of  claim 1 , wherein the light-emitting assembly further comprises an electrical lead extending through the luminescent structure and in electrical communication with the substrate. 
     
     
       5. The keyboard of  claim 1 , wherein the second side of the light-emitting assembly comprises a different material composition relative to the third side of the light-emitting assembly. 
     
     
       6. The keyboard of  claim 5 , wherein the second side comprises a transparent material composition and the third side comprises a phosphor material composition. 
     
     
       7. The keyboard of  claim 1 , wherein the light source is positioned horizontally off-center in the light-emitting assembly. 
     
     
       8. The keyboard of  claim 1 , wherein light emitted from the light source is configured to have a substantially equal wavelength when exiting through the second, third, and fourth sides. 
     
     
       9. A laptop computer, comprising:
 a casing including a lid portion and a base portion; 
 a display positioned in the lid portion; 
 a keyboard assembly positioned in the base portion, the keyboard assembly comprising:
 a substrate; 
 a set of keycaps positioned over the substrate and configured to move relative to the substrate along an axis of movement; 
 a set of light-emitting assemblies positioned under the set of keycaps, each light emitting assembly comprising:
 a light source configured to emit light in at least one direction perpendicular to the axis of movement; and 
 a light-blocking material configured to prevent light from exiting the light-emitting assembly in at least one other direction perpendicular to the axis of movement. 
 
 
 
     
     
       10. The laptop computer of  claim 9 , wherein the light-blocking material comprises an opaque material. 
     
     
       11. The laptop computer of  claim 9 , wherein the light source is within an at least partially transparent material. 
     
     
       12. The laptop computer of  claim 9 , wherein each of the light-emitting assemblies comprises a light-blocking mask positioned vertically above the light source. 
     
     
       13. The laptop computer of  claim 9 , further comprising a switch housing at least partially surrounding at least one light emitting assembly. 
     
     
       14. The laptop computer of  claim 13 , wherein the switch housing comprises a recess, at least one of the light-emitting assemblies being positioned in the recess. 
     
     
       15. The laptop computer of  claim 13 , wherein the switch housing is configured to house a switch. 
     
     
       16. A key input mechanism, comprising:
 a substrate; 
 a keycap positioned above the substrate and configured to move along a vertical axis when pressed; 
 a keycap support coupled to the keycap and movable with the keycap; 
 a light-emitting assembly electrically connected to the substrate and comprising a light source positioned below the keycap, the light-emitting assembly being configured to emit light along at least three directions in a plane perpendicular to the vertical axis; and 
 an opaque material that at least partially covers three lateral sides of the light-emitting assembly and prevents light from being emitted through the sidewall along a fourth direction in the plane. 
 
     
     
       17. The key input mechanism of  claim 16 , wherein the light-emitting assembly is positioned entirely under a top surface of the keycap. 
     
     
       18. The key input mechanism of  claim 16 , further comprising a switch, wherein at least one of the at least three directions is oriented toward the vertical axis. 
     
     
       19. The key input mechanism of  claim 16 , wherein the at least three directions are orthogonal to each other.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 14/867,746, filed Sep. 28, 2015, and titled “Light-Emitting Assembly for Keyboard”, which is a non-provisional of and claims the benefit to U.S. Provisional Patent Application No. 62/058,081, filed Sep. 30, 2014, and titled “Keyboard Assembly,” U.S. Provisional Patent Application No. 62/129,843, filed Mar. 7, 2015, and titled “Light Assembly for Keyboard Assembly,” U.S. Provisional Patent Application No. 62/058,074, filed Sep. 30, 2014, and titled “Keyboard Assembly,” U.S. Provisional Patent Application No. 62/129,841, filed Mar. 7, 2015, and titled “Key for Keyboard Assembly,” U.S. Provisional Patent Application No. 62/058,067, filed Sep. 30, 2014 and titled “Keyboard Assembly,” U.S. Provisional Patent Application No. 62/129,840, filed Mar. 7, 2015, and titled “Dome Switch for Keyboard Assembly,” U.S. Provisional Patent Application No. 62/058,087, filed Sep. 30, 2014, and titled “Keyboard Assembly,” and U.S. Provisional Patent Application No. 62/129,842, filed Mar. 7, 2015, and titled “Venting System for Keyboard Assembly,” the disclosures of which are hereby incorporated herein by reference in their entirety. 
    
    
     FIELD 
     The disclosure relates generally to a keyboard assembly for an electronic device and, more particularly, to a light-emitting assembly positioned within a switch housing of a keyboard assembly for an electronic device. 
     BACKGROUND 
     Electronic devices typically include one or more input devices such as keyboards, touch pads, mice, touch screens, and the like to enable a user to interact with the device. These devices can be integrated into an electronic device or can stand alone. An input device can transmit signals to another device via a wired or wireless connection. For example, a keyboard can be integrated into the casing (e.g., housing) of a laptop computer. Touch pads and other input devices may likewise be integrated into associated electronic devices. 
     It may be useful to illuminate an input surface or structure when the associated electronic device is used in a dimly lit or dark environment. Specifically, conventional keyboards typically illuminate a perimeter and/or a glyph located on each keycap of the keyboard to aid in the visibility of the keyboard in low-light settings. However, in order to light the keyboard, conventional keyboards often include a variety of components including a group of lights, typically positioned on one or more light strips, a light guide panel for directing the light, and/or a reflective surface for redirecting stray light and enhancing the illumination of the lights. 
     The variety of components may require additional space within the enclosure housing the keyboard, which may be counter to a desire to decrease the size of the keyboard. Additionally, the light strip may be a fraction of the size of the entire keyboard and may include fewer lights than the total number of keycaps in the keyboard. As a result, the light strip may unevenly illuminate the keyboard. Finally, because of the number of components and/or the configuration of the components used to illuminate a conventional keyboard, an undesirable amount of heat may be generated within the keyboard and/or electronic device. 
     SUMMARY 
     A light-emitting assembly for a keyboard assembly is disclosed herein. The light-emitting assembly comprises a phosphor structure, a transparent material positioned on opposing side surfaces of the phosphor structure, and an epoxy layer positioned over an entire back surface of the phosphor structure and the transparent material. The light-emitting assembly also comprises a mask layer positioned over an entire top surface of: the phosphor structure, the transparent material, and the epoxy layer. The light-emitting assembly further comprises a light source positioned within the phosphor structure for emitting a light. 
     A keyboard assembly may comprise a switch housing formed from a substantially transparent material. The switch housing comprises a switch opening and a light source recess positioned adjacent the switch opening. The keyboard assembly also comprises a keycap positioned above the switch housing and a light-emitting assembly positioned within the light source recess of the switch housing. Additionally, the light-emitting assembly comprises a phosphor structure, a transparent material positioned on opposing side surfaces of the phosphor structure, a mask layer positioned over an entire top surface of the phosphor structure, and the transparent material. The light-emitting assembly also comprises a light source positioned within the phosphor structure for emitting a light through the switch housing. 
     Embodiments may take the form of a keyboard assembly comprising a keycap, a light source operably connected to the keycap and configured to illuminate the keycap, and a light source housing at least partially surrounding the light source. The light source housing is operative to block light from emanating out of the light source housing in a first direction and a second direction. The light source housing is also operative to pass light emanating in a third direction opposite the first direction, and the second direction is toward the keycap, as measured from the light source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which: 
         FIG. 1  shows an electronic device including a low-travel keyboard assembly, according to embodiments. 
         FIG. 2  shows a light-emitting assembly of a low-travel keyboard assembly, according to embodiments. 
         FIG. 3  shows a cross-sectional front view of the LED assembly taken along line  3 - 3  in  FIG. 2 , according to embodiments. 
         FIG. 4  shows a cross-sectional side view of the LED assembly taken along line  4 - 4  in  FIG. 2 , according to embodiments. 
         FIG. 5  shows an exploded view of a single key of the low-travel keyboard assembly of  FIG. 2 , according to embodiments. 
         FIG. 6  shows a cross-section view of a low-travel keyboard assembly including a switch housing taken along line  6 - 6  in  FIG. 5 , according to embodiments. 
         FIG. 7  shows a top view of a switch housing of a low-travel keyboard assembly including light-emitting assembly of  FIGS. 2-4 , according to embodiments. 
         FIG. 8  is a flowchart illustrating a sample method of illuminating an input surface. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following descriptions are not intended to limit the embodiments to one preferred embodiment. To the contrary, it is intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the described embodiments as defined by the appended claims. 
     The following disclosure relates generally to a keyboard assembly for an electronic device and, more particularly, to a light-emitting structure positioned within a switch housing of a keyboard assembly for an electronic device. The light-emitting structure may be a light-emitting assembly formed from a number of different elements. 
     In a particular embodiment, the light-emitting assembly may be formed from a light source positioned within a phosphor structure adjacent, touching, or at least partially surrounded by various layers or materials, including: sidewalls (which may be formed from a transparent material or opaque material); epoxy (which may form a sidewall and may be either opaque or transparent); a mask layer; and/or a heat dissipation layer. The light-emitting assembly generates and/or transmits light in certain directions, such as through one or more of the phosphor structure and layers. The various layers may restrict light to traveling through only three sides of the assembly, in certain embodiments. 
     Light exiting the light-emitting assembly generally has a common wavelength and thus common color. Where the wavelengths and colors of light traveling through all light-transmissible sides of the assembly are equal, that light may illuminate an input surface such as a keycap. Accordingly, the keycap is substantially uniformly illuminated and has reduced or no dim spots and/or color shifts. Additionally, because of the configuration of the various layers and materials forming the light-emitting assembly, the light-emitting assembly may be a parallelepiped and compact, thereby reducing the space occupied within the keyboard assembly. Finally, where each key of the keyboard assembly includes an individual light-emitting assembly, keys and/or keycaps may be illuminated individually or selectively. 
     These and other embodiments are discussed below with reference to  FIGS. 1-7 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these Figures is for explanatory purposes only and should not be construed as limiting. 
       FIG. 1  shows an electronic device  100  including a low-travel keyboard assembly  200  that may incorporate a light-emitting assembly for illuminating keyboard assembly  200 , as described in more detail below with respect to  FIGS. 2-4 . In a non-limiting example, as shown in  FIG. 1 , electronic device  100  may be a laptop computer. However, it is understood that electronic device  100  may be configured as any suitable electronic device that may utilize low-travel keyboard assembly  200 . Other embodiments can implement electronic device  100  differently, such as, for example, a desktop computer, a tablet computing device, a telephone, a gaming device, a display, a digital music player, a wearable computing device or display, a health monitoring device, and so on. 
     Electronic device  100  may include a top case  102 . Top case  102  may take the form of an exterior, protective casing or shell for electronic device  100  and the various internal components (for example, low-travel keyboard assembly  200 ) of electronic device  100 . Top case  102  may be formed as a single, integral component, or may have a group of distinct components that may be configured to be coupled to one another, as discussed herein. Additionally, top case  102  may be formed from any suitable material(s) that provides a protective casing or shell for electronic device  100  and the various components included in electronic device  100 . In non-limiting examples, top case  102  may be made from metal, a ceramic, a rigid plastic or another polymer, a fiber-matrix composite, and so on. 
     Low-travel keyboard assembly  200  may be included within electronic device  100  to allow a user to interact with electronic device  100 . As shown in  FIG. 1 , low-travel keyboard assembly  200  is positioned within and/or may be received by top case  102  of electronic device  100 . Low-travel keyboard assembly  200  may include a set of keycaps  300  positioned within and partially protruding through and/or surrounded by top case  102  of electronic device  100 . As discussed herein, keycaps  300  are depressed and displaced to at least partially collapse a dome switch of low-travel keyboard assembly  200 , which in turn forms an electrical signal or input to electronic device  100 . 
     As discussed herein, keycap  300  of low-travel keyboard assembly  200  can be illuminated by a light-emitting assembly. The light-emitting assembly of low-travel keyboard assembly  200  is positioned in a switch housing surrounding a dome switch, where the switch housing and dome switch are positioned below keycap  300 . That is, each individual keycap  300  includes an individual switch housing, which includes an individual light-emitting assembly positioned therein. As a result, a single light-emitting assembly illuminates each corresponding keycap  300 . This can improve brightness and light uniformity for each keycap, and between keycaps. 
     Additionally, because each keycap  300  is illuminated by a single, corresponding light-emitting assembly, keycaps  300  of keyboard assembly  200  can be illuminated individually or selectively. In some embodiments, other illumination schemes may be used. For example, adjacent of keys can be lit by a single light-emitting assembly (e.g., one light-emitting assembly for each group of keys). In other embodiments, a row or column of keys may be illuminated by a single light-emitting assembly. In still other embodiments, light source assemblies may be located at different points under a keyboard so that a relatively small number of assemblies may illuminate an entire keyboard (or all keycaps of the keyboard). In any or all embodiments, light source assemblies may be located within or outside of switch housings, under keycaps, or under portions of the casing. Further, light source assemblies described herein may be used with other input devices, including mice, track pads, buttons, switches, touch-sensitive and/or force-sensitive surfaces, and so on. 
     The light source assemblies of low-travel keyboard assembly  200  are formed from a light source positioned within a phosphor structure surrounded by various layers or materials that may include one or more transparent materials, one or more epoxy layers and one or more mask layers. The various layers to allow light to be emitted from only three sides of the assembly. Further, the emitted light has identical wavelengths and color. Where the wavelengths and visible light color are identical on all sides of the assembly, keycap  300  of low-travel keyboard assembly  200  is illuminated by the light-emitting assembly with a consistent visible light color and does not have discrepancies in illuminating light color or intensity. 
     Additionally, and as discussed herein, because of the configuration of the various layers and materials forming the light-emitting assembly, the light-emitting assembly can be a parallelepiped. The parallelepiped shape of the light-emitting assembly of low-travel keyboard assembly may reduce the overall size of light-emitting assembly and/or makes light-emitting assembly substantially compact. With a reduced size, the required amount of space occupied by light-emitting assembly within keyboard assembly  200  may also be reduced. This ultimately allows for low-travel keyboard assembly  200  and/or electronic device  100  to have a reduced size as well. It should be appreciated that substantially any other geometric or non-geometric three-dimensional shape may also be used for a light-emitting assembly. 
     In the non-limiting example shown in  FIG. 1 , where electronic device  100  is a laptop computer, low-travel keyboard assembly  200  may be positioned within and/or may be received by electronic device  100 . In an additional embodiment, low-travel keyboard assembly  200  may be a distinct, standalone component and may be in electronic communication, whether wired or wireless, with electronic device  100 . Low-travel keyboard assembly  200  may be configured to allow a user to interact with electronic device  100 . 
       FIG. 2  shows a light-emitting assembly  201  of low-travel keyboard assembly  200  (see,  FIGS. 1 and 5-7 ). Light-emitting assembly  201  may emit a light that travels from the assembly, into a switch housing, and is redirected by the switch housing to illuminate keycap  300 . With the spatial constraints of light source recess  404  of switch housing  400  (see,  FIGS. 5-7 ), discussed herein, light-emitting assembly  201  may be configured to fit in light source recess  404  and provide light to keycap  300 , including during operation of low-travel keyboard assembly  200 . 
     Light-emitting assembly may have a phosphor structure  202  and transparent material  204  positioned on opposing sides surfaces of phosphor structure  202 . In some embodiments, the transparent material may be positioned on or otherwise abutting the phosphor material, either wholly or partially. The phosphor structure may be a phosphor-doped material and may overlay a light source  220 . In some embodiments, the phosphor structure may alter a wavelength of a light emitted by the light source, thereby altering its color. Further, in some embodiments the phosphor structure may luminesce (e.g., emit light) when the light source is active. Thus, the phosphor structure may be a luminescent structure. As discussed herein, phosphor structure  202  and transparent material  204  may allow light from a light source of light-emitting assembly  201  to be emitted through the respective portions. 
     The transparent material  204  may permit light to travel therethrough. Any suitable material may be used as the transparent material, including various plastics, polymers, ceramics, glasses, and so on. 
     Light source  220  of light-emitting assembly  201  may be positioned within phosphor structure  202 . As shown in the cross-sectional views of  FIGS. 3 and 4 , light source  220  may be positioned substantially in the center of, and substantially encompassed within, phosphor structure  202  of light-emitting assembly  201 . Light source  220  may emit a light through phosphor structure  202  and transparent material  204  and, ultimately, through switch housing  400  of low-travel keyboard assembly  200 , as discussed herein with respect to  FIGS. 5-7 . In some embodiments, the light source  220  may be off-center with respect to the phosphor structure  202  and/or light-emitting assembly  201 . 
     A variety of different light sources  220  may be used in the light-emitting assembly  201 . For example, the light source  220  may be a light-emitting diode, an organic light-emitting diode, a quantum dot, a cold cathode fluorescent lamp, and so on. Further, the light source may emit multiple colors of light in some embodiments. As an example, the light source may be a multicolor LED and the color emitted by the LED may change based on a user input, operating state, software or firmware command, and so on. Some embodiments may also employ multiple light sources  220  in a single light-emitting assembly  201 . 
     Light-emitting assembly  201  may also have an epoxy layer  210  placed over an entire back surface  212  of phosphor structure  202  and transparent material  204 . In one embodiment, epoxy layer  210  may be substantially larger in one or more dimension than phosphor structure  202  and transparent material  204 , although this may vary between embodiments. More specifically, as shown in  FIG. 2 , epoxy layer  210  may be substantially wider than phosphor structure  202  and transparent material  204  an example of this is shown in  FIG. 4 . 
     Returning to  FIG. 2 , epoxy layer  210  may be adjacent or abutting back surface  212  of phosphor structure  202  and transparent material  204 , which may substantially waterproof light-emitting assembly  201  and its components. In non-limiting examples, epoxy layer  210  may be substantially transparent to allow light from light source  220  to pass through epoxy layer  210 . Alternatively, epoxy layer  210  may be opaque epoxy and prevent light from passing through epoxy layer  210 . In some embodiments, the transparent material  204  may be formed on the phosphor structure; likewise in some embodiments the epoxy may be directly formed on the back surface (e.g., rear). In other embodiments, the transparent material and/or epoxy layer may be deposited or layered, rather than formed, on their corresponding surfaces. 
     Light-emitting assembly  201  may also incorporate a mask layer  218 . Mask layer  218  may be positioned over phosphor structure  202 , transparent material  204  and/or epoxy layer  210  of light-emitting assembly  201 . In a non-limiting example shown in  FIG. 2 , phosphor structure  202 , transparent material  204  and epoxy layer  210  of light-emitting assembly  201  may have top surfaces that may be in planar alignment and may be substantially covered by mask layer  218 . Mask layer  218  may be formed from an opaque material to prevent light of light source  220  from being emitted through mask layer  218 . 
     With continued reference to  FIG. 2 ,  FIGS. 3 and 4  show cross-section views of LED assembly  201 . Specifically,  FIG. 3  shows a cross-sectional front view of LED assembly  201  taken along line  3 - 3  in  FIG. 2 , and  FIG. 4  shows a cross-sectional side view of LED assembly  201  taken along line  4 - 4  in  FIG. 2 . As shown in  FIG. 4 , light source  220  may have one or more electrical leads  222  electrically coupled to light source  220  and a substrate  228 , such as a printed circuit board (PCB)  500  of low travel keyboard assembly  200  (see,  FIGS. 5-7 ), to provide power to light source  220 . In the non-limiting example shown in  FIGS. 2-4 , the electrical leads  222  electrically couple light source  220  to substrate  228 , such that substrate  228  may provide power to light source  220 , as discussed herein. As shown in  FIGS. 2 and 4 , the electrical leads  222  may be positioned in phosphor structure  202  and may extend toward back surface  212  of phosphor structure  202 . Portions of the leads  222  of light source  220  may also extend through or be positioned within epoxy layer  210 , so that epoxy layer  210  seals (e.g., waterproofs) the electrical leads  222  and, ultimately, light source  220 , to prevent light source  220  from undesirably shorting due to moisture exposure. As shown in  FIG. 4 , the portion of the electrical leads  222  placed and sealed within epoxy layer  210  may be an end portion  224  of leads  222 , which may be electrically coupled to and/or in electronic communication with a light source contact  234  of substrate  228  for receiving power for light source  220 . 
     Light-emitting assembly  201  may also have a heat dissipation layer  226  over mask layer  218 . Heat dissipation layer  226  may be formed from a heat resistant material that may dissipate the heat generated by light source  220  and the light generated by light source  220 . As light is emitted from light source  220 , light may contact mask layer  218 , but may not be emitted through opaque mask layer  218 . However, the light and light source  220  may generate heat on or in mask layer  218 . Heat dissipation layer  226  may be positioned on mask layer  218  to dissipate the heat exposed to mask layer  218 , which in turn reduce or prevent chemical and/or physical changes to mask layer  218 . In some embodiments, the mask layer and heat dissipation layer may be the same layer, or formed from the same material. For example, a thermally conductive mask layer may be used. 
     In some embodiments, the transparent material(s)  204 , mask layer  218 , heat dissipation layer  226 , and/or epoxy layer  210  may be affixed to the phosphor structure  202 . This may be accomplished by any or all of an additional element such as an adhesive or fastener, an inherent property of one or more parts of the light-emitting assembly  201 , or the method of manufacture for the assembly. It should be appreciated that the various parts of the light-transmitting assembly  201  need not be affixed to one another. For example, they may be affixed to substrate  228  such as a printed circuit board  500  or to a switch housing  400  (see,  FIGS. 5 and 6 ) instead. 
       FIGS. 2-4  show light rays, labeled L 1-3 , emanating from light source  220 . These rays are examples and are not intended to illustrate any limiting angle for emitted light. Rather, the light source  220  may emit light at any angle and direction, including out-of-plane with the illustrated light rays. Thus, for example, the light source may emit light in a hemispherical pattern, near-spherical pattern, conic pattern, and so on. Accordingly, the light rays are intended to show overall, sample directions of emitted light and particularly how light may pass through certain surfaces of the light-emitting assembly  201 . 
     In one embodiment, light may be emitted through three sides of light-emitting assembly  201 . In the non-limiting example shown in  FIGS. 4-6 , light (L 1 ) may be emitted through a front face of light-emitting assembly  201  including phosphor structure  202 . Likewise light (L 2 ) may be emitted through a first sidewall  230  defined by transparent material  204 . Additionally, light (L 3 ) may be emitted through a second sidewall  232  of light-emitting assembly  201  including transparent material  204 . The second side surface  232  may be opposite first side surface  230 . The first and second side surfaces may be sidewalls. 
     Light (L 1 ) emitted through the front face of light-emitting assembly  201  may have a wavelength substantially equal to a wavelength of light (L 2 ) emitted through first transparent sidewall  230  and a wavelength of light (L 3 ) emitted through second transparent sidewall  232 . As a result of the wavelengths of light (L 1-3 ) being equal, the visible light color of the light (L 1-3 ) may also be identical or substantially the same. That is, the visible light color of the light (L 1 ) emitted through the front face of light-emitting assembly  201  may be substantially identical to a visible light color of light (L 2 ) emitted through first transparent sidewall  230  and a visible light color of light (L 3 ) emitted through second transparent sidewall  232 . 
     As shown in  FIGS. 2-4 , light-emitting assembly  201  may be a parallelepiped, or substantially a parallelepiped. Further, phosphor structure  202  and transparent material  204  positioned on opposite sides of surfaces of phosphor structure  202  may be substantially parallelepiped-shaped. Other embodiments may employ light-emitting assemblies  201  of any suitable shape and/or size, including irregular shapes. Likewise, a shape of the phosphor structure  202  need not match a shape of the overall assembly. 
     As a result of its geometry, light-emitting assembly  201  may require less space in low-travel keyboard assembly  200 , as discussed herein with respect to  FIGS. 5-7 . Further, the aforementioned transparent material may form one or more transparent sidewalls of the light-emitting assembly. For example and as shown in  FIG. 2 , opposing sidewalls may be formed from the transparent material. Similarly, a rear or back surface of the light-emitting assembly may be formed from epoxy or another suitable material, and may be opaque. A front face of the light-emitting assembly  201  may be formed by a front surface of the phosphor structure. A mask layer may overlay the phosphor structure and upper surfaces of the sidewalls, thereby defining a top of the assembly. As also shown in  FIG. 2 , the phosphor structure may abut the sidewalls and the opaque material forming the rear, although other embodiments may include spaces between any or all of the foregoing. Further and as shown in  FIGS. 2-4 , the phosphor structure may fill an interior of the light-emitting assembly, as defined by the sidewalls, rear, and mask layer. 
     Additionally, because of the geometric shape of light-emitting assembly  201  and the inclusion of transparent material  204  positioned on opposite sides of phosphor structure  202 , the wavelength and, ultimately, the visible light color of the light emitted by light source  220  may be substantially identical on all sides of light-emitting assembly  201 . That is, the greater the thickness of phosphor structure  202  in which light from light source  220  must travel through, the more the wavelength of the light will change. However, a wavelength of light from light-emitting assembly  201  may be tuned by adding or removing more transparent material  204 . This may ensure that the wavelength of light (L 1 ) emitted through the front face, including front surface of phosphor structure  202 , is equal to the wavelengths of the light (L 2 , L 3 ) emitted through first sidewall and second sidewall including transparent material  204 . And, as discussed herein, wherein the wavelengths of light emitted through light-emitting assembly  201  are equal, the visible light color of light emitted through light-emitting assembly  201  may also be identical or substantially the same, creating a uniform illumination color for keycap  300  of keyboard assembly  200  (see,  FIGS. 5-7 ). 
       FIGS. 5 and 6  show a sample key structure of low-travel keyboard assembly  200  that utilizes light-emitting assembly  201  (see,  FIG. 6 ), according to non-limiting examples. Specifically,  FIG. 5  shows a detailed exploded view of a portion of top case  102  of electronic device  100  and a single key structure  502  that utilizes light-emitting assembly  201 , as discussed herein.  FIG. 6  shows a cross-section view of the single key assembly  502 , taken along line  6 - 6  of  FIG. 5 . It is understood that similarly named components or similarly numbered components may function in a substantially similar fashion, may include similar materials and/or may include similar interactions with other components. Redundant explanation of these components has been omitted for clarity. 
     As shown in  FIG. 5 , top case  102  of electronic device  100  (see,  FIG. 1 ) may include one or more keyholes  104  formed therethrough. Top case  102  may also include ribs or other supports  106  between or about the keycaps  300 , and may substantially surround and/or may be positioned within the space between the keycaps  300  of low-travel keyboard assembly  200 . 
     Low-travel keyboard assembly  200  may be made from a number of layers or components positioned adjacent to and/or coupled to one another. The components positioned in layers may be positioned adjacent to and/or coupled to one another, and may be sandwiched between top case  102  and a bottom case (not shown) of electronic device  100 . 
     The keycaps  300  of low-travel keyboard assembly  200  may be positioned at least partially within keyholes  104  of top case  102 . Each of the keycaps  300  may include a glyph  302  positioned on a top or exposed surface of the keycap  300 . Each glyph  302  of keycap  300  may be substantially transparent to allow a light to be emitted through and/or illuminate keycap  300 . In the non-limiting example shown in  FIGS. 5 and 6 , keycap  300  may be substantially opaque, except for glyph  302 , which may be transparent to allow light to be emitted through keycap  300 . Additionally, the perimeter of keycap  300  may be substantially illuminated by light emitted between the space between keycap  300  and skeletal ribs  106  of top case  102 . 
     As shown in  FIG. 6 , keycap  300  of low-travel keyboard assembly  200  may include retaining members  304 ,  306  positioned on keycap  300 . More specifically, keycap  300  may include at least one first retaining member  304  positioned on first side  308  and at least one second retaining member  306  positioned on a second side  310  of keycap  300 , opposite first side  308 . Retaining members  304 ,  306  may be formed, positioned, or retained on an underside  312  of keycap  300  adjacent a switch housing  400  of low-travel keyboard assembly  200 . The retaining members  304 ,  306  may be utilized to couple keycap  300  within low-travel keyboard assembly  200  and, specifically, to couple keycap  300  to a hinge mechanism  322  coupled to PCB  500 . Hinge mechanism  322 , as shown in  FIG. 6 , may include any suitable hinge mechanism  322  capable of moving keycap  300  from an undepressed (e.g., rest) state to a depressed state, including, but not limited to, a butterfly hinge mechanism, a scissor hinge mechanism, a telescoping hinge mechanism or a sliding hinge mechanism. Hinge mechanism  322  may be coupled to and/or positioned within recess a  502  formed in PCB  500  of low-travel keyboard assembly  200 . 
     The keycaps  300  may be positioned above corresponding switch housings  400  of low-travel keyboard assembly  200 , and may interact with a corresponding switch housing  400 . Each switch housing  400  of low-travel keyboard assembly  200  may include a switch opening  402  extending completely through switch housing  400 , and a light source recess  404  formed within each switch housing  400 . Some switch housings  400  may define multiple light source recesses  404 , each of which may house its own light-emitting assembly  201  or multiple assemblies. Further, the light source recess  404  may be sized such that one or more of its interior walls engage the exterior of the light-emitting assembly  201 , or gaps may exist between the interior walls of the light source recess and any or all parts of the light-emitting assembly&#39;s exterior. 
     As shown in  FIG. 6 , switch opening  402  may receive and/or house dome switch  406 , which may be collapsed in response to keycap  300  translating. The dome switch collapses (or partially collapse) to generate an electrical connection acting as a signal to electronic device  100  (see,  FIG. 1 ). Additionally, as shown in  FIG. 6 , light source recess  404  of switch housing  400  may receive light-emitting assembly  201 , which may emit a light through switch housing  400  to provide a light around the perimeter of keycap  300  and/or through transparent glyph  302  (see,  FIG. 5 ) of keycap  300 . Additionally in another non-limiting example, light-emitting assembly  201  may emit light directly toward recess  502  to aid in illuminating the perimeter of keycap  300 . Although discussed herein as a dome switch, it is understood that switch opening  402  may receive or house different types of switches. 
     As also shown in  FIG. 6 , switch housing  400  may include a body portion  410  and a top panel  412  formed integrally and molded to body portion  410 . Body portion  410  of switch housing  400  may include switch opening  402  and light source recess  404  adjacent switch opening  402 . Body portion  410  may be directly coupled to PCB  500 , as shown in  FIG. 6 . 
     Body portion  410  and top panel  412  of switch housing  400  may be formed from distinct materials. That is, body portion  410  may be formed from a first material having substantially rigid properties for supporting keycap  300  during operation of low-travel keyboard assembly  200  and/or protecting the various components (e.g., dome switch  406 , light-emitting assembly  201 ) included within switch housing  400 . The first material forming body portion  410  of switch housing  400  may also be transparent and/or reflective to direct light out of the switch housing and toward the keycap  300 . In a non-limiting example, light source  220  of light-emitting assembly  201  may emit light through transparent switch housing  400 , and switch housing  400  may substantially reflect and/or allow light to be transmitted through the transparent material of switch housing  400  to illuminate glyph  302  on keycap  300  and/or the perimeter of keycap  300 . 
     The top panel  412  may act as a light guide to direct light emitted from light-emitting assembly  201  to keycap  300 . The top panel  412  may include structures configured to focus light on specific areas of the keycap or about the keycap, as well as reflective structures configured to direct light toward the keycap. For example, lenses, apertures, and the like may emit light from the top panel, while an upper surface of the top panel may reflect light incident on the panel. 
     Top panel  412  of switch housing  400  may be formed integrally with body portion  410 . As one example, as shown in  FIG. 6 , top panel  412  may be overmolded on body portion  410  and may cover switch opening  402  of body portion  410 . In a non-limiting example, top panel  412  may be formed integrally with body portion  410  using a double-shot housing formation process. Top panel  412  may be formed from a second material, distinct from the first material forming body portion  410 , and may be substantially flexible/deformable. As discussed herein, top panel  412  may substantially flex and protect dome switch  406  when keycap  300  is depressed. In addition to being flexible, the second material forming top panel  412  may have substantially transparent properties that allow light to pass through top panel  412  to keycap  300  and/or substantially reflective properties to redirect light toward keycap  300 . 
     Top panel  412  may be positioned over switch opening  402  not only to redirect light toward keycap  300  but also to substantially protect dome switch  406  from wear. That is, when a force is applied to keycap  300  to depress keycap  300 , keycap  300  may contact top panel  412  of switch housing  400 , which may subsequently deform and collapse dome switch  406  to form an electrical connection. By acting as a barrier between keycap  300  and dome switch  406 , top panel  412  may reduce the wear on dome switch  406  over the operational life of low-travel keyboard assembly  200 . 
     Top panel  412  may also include a first contact protrusion  418  positioned on a first surface  420  of the top panel  412 . First contact protrusion  418  may be positioned directly adjacent a second contact protrusion  340  on underside  312  of keycap  300 . The first contact protrusion  418  of top panel  412  and the second contact protrusion  340  of keycap  300  may contact one another when keycap  300  is depressed and may more evenly distribute the force applied to top panel  412  and, subsequently, dome switch  406  when keycap  300  is depressed. By distributing the force through top panel  412 , the wear on dome switch  406  may be further reduced over the operational life of low-travel keyboard assembly  200 . 
     Switch housing  400  may also include a roof portion  426  over light source recess  404 . More specifically, body portion  410  of switch housing  400  may include a roof portion  426  positioned over light source recess  404  and light-emitting assembly positioned within light source recess  404 . As shown in  FIG. 6 , roof portion  426  of switch housing  400  may be formed integrally with switch housing  400  and, specifically, body portion  410  of switch housing  400 . However, it is understood that roof portion  426  of switch housing  400  may be formed from a distinct component or material that may be coupled to body portion  410  of switch housing  400 . Roof portion  426  of switch housing  400  may be substantially opaque to prevent the light of light-emitting assembly  201  from being emitted through roof portion  426 . In a non-limiting example, substantially opaque roof portion  426  may work in conjunction with mask layer  218  of light-emitting assembly  201 , as discussed herein with respect to  FIG. 4 , to prevent light from passing directly toward keycap  300  and/or through roof portion  426  of switch housing  400 . 
     Low-travel keyboard assembly  200  may also include a printed circuit board (PCB)  500  positioned below the group of switch housings  400 . PCB  500  may be similar to substrate  228  discussed herein with respect to  FIGS. 2-4 . As shown in  FIGS. 5 and 6 , switch housings  400  may be coupled to PCB  500  of low-travel keyboard assembly  200 . More specifically, PCB  500  may include a number of recesses  502  within PCB  500 , where each recess  502  of PCB  500  may receive a corresponding switch housing  400  of low-travel keyboard assembly  200 . Each switch housing  400  may be positioned completely within, and coupled to the surface of, recess  502  of PCB  500 . PCB  500  may provide a rigid support structure for switch housing  400 , and the various components forming low-travel keyboard assembly  200 . 
     PCB  500  may also include one or more apertures  504  extending through each of the recesses  502 . That is, aperture  504  may pass completely through PCB  500  in recess  502 . As shown in  FIGS. 5 and 6 , aperture  504  of PCB  500  may be substantially aligned with switch opening  402  of switch housing  400  of low-travel keyboard assembly  200 . The apertures  504  of PCB  500  may be utilized to receive a portion of the dome switch positioned within switch housing  400  when the dome switch collapses. 
     As shown in  FIG. 6  and discussed herein with respect to  FIGS. 2-4 , light-emitting assembly  201  and, specifically, leads  222  of light source  220  may be in electrical contact with light source contact  234  extending from or through PCB  500 . Light source contact  234  may be in communication with a light source driver  530  positioned on second surface  518  of PCB  500 . PCB  500  may have a number of light source drivers  530  positioned on second surface  518 , where each light source driver  530  corresponds to, and is in electronic communication with, light-emitting assembly  201  of low-travel keyboard assembly  200 . light source drivers  530  positioned on second surface  518  of PCB  500  may be configured to provide power and/or control to light-emitting assembly  201  during operation of low-travel keyboard assembly  200  included in electronic device  100  (see,  FIG. 1 ). It is understood that  FIG. 6 , showing a single key assembly, may represent some or all of the keys for low-travel keyboard assembly  200 . Where each key assembly of low-travel keyboard assembly  200  is structured similar to the key assembly shown in  FIG. 6 , each switch housing  400  for each key of low-travel keyboard assembly  200  may have light-emitting assembly  201 . As a result, each individual keycap  300  may be illuminated by the corresponding individual light-emitting assembly  201 . 
     Low-travel keyboard assembly  200 , as shown in  FIGS. 5 and 6 , may include a keyboard shield  600  positioned below PCB  500 . Keyboard shield  600  may be formed from a conductive adhesive sheet  602  adhered to PCB  500  opposite switch housing  400 . Conductive adhesive sheet  602  of shield  600  may include a venting system  604 , which vents air expelled from switch housing  400  when dome switch  406  collapses, as discussed herein. As shown in  FIGS. 5 and 6 , venting system  604  may include a group of channels  606  formed within and/or partially through conductive adhesive sheet  602  of shield  600  which may be in fluid communication and/or may be substantially aligned with dome switch opening  402  formed in switch housing  400  and aperture  504  formed through PCB  500 . Conductive adhesive sheet  602  of keyboard shield  600  may be utilized to transmit signals to and/or from keyboard assembly  200  of electronic device  100  during user interaction. 
       FIG. 7  shows a top view of switch housing  400  including light-emitting assembly  201 . Roof portion  426  of switch housing  400  and mask layer  218  of light-emitting assembly  201  are omitted in  FIG. 7  to clearly show light-emitting assembly  201  positioned within light source recess  404  of switch housing  400 . As discussed herein with respect to  FIGS. 2 and 6 , roof portion  426  of switch housing  400  and mask layer  218  of light-emitting assembly  201  may prevent light from passing through roof portion  426 , directly toward keycap  300 . As shown in  FIG. 7 , light-emitting assembly  201  may be substantially surrounded by three sidewalls  450  of light source recess  404  of switch housing  400 . In one example, light source recess  404  may be bounded by three sidewalls  450  to ensure that light emitted by light-emitting assembly  201  passes through a large portion of switch housing  400  and subsequently illuminates keycap  300  of low-travel keyboard assembly  200 . That is, by substantially surrounding light-emitting assembly  201  with sidewalls  450  of light source recess  404 , a majority of light (L 1-3 ) may directly pass through switch housing  400  and/or switch housing  400  may reflect light (L 1-3 ) toward keycap  300 . 
     As shown in  FIG. 7 , light-emitting assembly  201  may be surrounded by a curable, transparent resin  236  (hereafter, “resin  236 ”) that may be positioned between light-emitting assembly  201  and sidewalls  450  of light source recess  404  of switch housing  400 . Resin  236  may be formed or placed over light-emitting assembly  201  after light-emitting assembly  201  is positioned within light source recess  404  of switch housing  400 , to retain light-emitting assembly in light source recess  404  and/or to seal light-emitting assembly  201  from outside contaminants (e.g., water). Additionally, resin  236  may aid in dissipating heat from light-emitting assembly during operation of low-travel keyboard assembly  200 . Furthermore, the transparent characteristics or properties of resin  236  may allow light to pass through resin  236  toward recess  502  to aid in illuminating the perimeter of keycap  300 , as discussed herein. 
     Operation of a sample embodiment will now be described with respect to  FIG. 8 . Initially, in operation  800  a light source may be activated. Light may be transmitted from the light source and through the light-emitting assembly in operation  802 . For example, light may pass through the phosphor structure and/or transparent material of the light-emitting assembly. Likewise, light may be blocked from exiting the assembly in certain directions, for example by the mask layer and/or epoxy. The phosphor material may color-shift the light as it passes therethrough, although this is not necessary. 
     In operation  804 , light may exit the light-emitting assembly and enter an associated switch housing. A body of the switch housing may redirect the light upward, for example toward a top panel of the switch housing. In some embodiments, the body (or portions thereof) may be reflective to facilitate redirection of light. In other embodiments, light may not be substantially redirected or may be moderately or minimally redirected. Further, the top panel may act as a light guide to redirect light from the switch housing toward a key cap or other input surface 
     In operation  806 , light may exit the top panel and emanate toward an underside of the key cap or other input surface. In operation  808 , the light may illuminate a glyph on the key cap and/or may illuminate a perimeter of the key cap. 
     Although discussed herein as a keyboard assembly, it is understood that the disclosed embodiments may be used in a variety of input devices used in various electronic devices. That is, low-travel keyboard assembly  200  and the components of the assembly discussed herein may be utilized or implemented in a variety of input devices for an electronic device including, but not limited to, buttons, switches, toggles, wheels, and touch screens. 
     The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.

Metadata:
Filing Date: 20181214
Publication Date: 20201229
Grant Date: 20201229
Priority Date: 20140930
Inventors: ZERCOE, BRADFORD J.
LEONG, Craig C.
HENDREN, KEITH J.
Assignee: APPLE INC
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