PATENT DOCUMENT

Publication Number: US-9189078-B2
Application Number: US-97388810-A
Country: US
Kind Code: B2

Title: Enhancing keycap legend visibility with optical components

Abstract:
Techniques and apparatus to provide improved visibility to user input devices, such as keys, are disclosed. In low light conditions, key legends can be difficult to distinguish. For example, often keys have legends on them to visually distinguish them from one another, but in low light conditions it can be difficult for users to visually identify the different keys. The legends can be textual and/or graphic. Hence, according to one embodiment, light from a nearby (e.g., attached) display device can be used to provide illumination to the user input devices (e.g., keys). The user input devices can be configured to include reflective optical components to enhance reflection of light and thereby improve visibility of the keys or the legends thereon.

Claims:
What is claimed is: 
     
       1. A computing device, comprising:
 a display for presenting displayed data; and 
 at least one key configured to facilitate user input to the computing device, the at least one key including at least a key cap, the key cap including a top surface having an angled reflective surface thereon, 
 wherein the angled reflective surface is selectively patterned or covered to yield a reflective legend on the at least one key, 
 wherein the display emits light towards the at least one key, and wherein a portion of the light emitted from the display is reflected by the angled reflective surface of the key cap and directed toward a user position, and 
 wherein the angled reflective surface has a variety of angles in x-axis direction, y-axis direction, or both directions for different reflective surfaces. 
 
     
     
       2. A computing device as recited in  claim 1 , wherein the angled reflective surface comprises a plurality of angled reflective surfaces. 
     
     
       3. A computing device as recited in  claim 1 , wherein the angled reflective surface comprises a reflective sawtooth-shaped groove profile. 
     
     
       4. A computing device as recited in  claim 1 , wherein the angled reflective surface comprises aluminum, silver or compounds thereof. 
     
     
       5. A computing device as recited in  claim 1 , wherein the key cap of the at least one key further includes an outer protective layer provided over the angled reflective surface. 
     
     
       6. A computing device as recited in  claim 5 , wherein the angled reflective surface comprises a multi-faceted reflective surface with each of a plurality of the facets providing a different surface orientation. 
     
     
       7. A computing device as recited in  claim 6 , wherein the reflective legend of the at least one key is configured to reflect light emitted from the display so that a user of the computing device is better able to see the reflective legend in low light environments. 
     
     
       8. A computing device as recited in  claim 1 ,
 wherein the reflective legend of the at least one key is configured to reflect light emitted from the display so that a user of the computing device is better able to see the reflective legend in low light environments. 
 
     
     
       9. A computing device as recited in  claim 1 , wherein the at least one key is at least partially transmissive, and
 wherein the computing device comprises at least one backlight provided behind the at least one key. 
 
     
     
       10. A computing device as recited in  claim 1 , wherein the angled reflective surface comprises a layer or coating of ink or paint including reflective material. 
     
     
       11. A computing device as recited in  claim 1 , wherein the computing device is a portable computing device, and wherein the at least one key is part of a keypad. 
     
     
       12. A computing device as recited in  claim 1 , wherein the angled reflective surface includes at least a reflective blaze structure. 
     
     
       13. A computing device as recited in  claim 12 , wherein the reflective blaze structure comprises a reflective sawtooth-shaped groove profile, and wherein the reflective sawtooth-shaped groove profile for the at least one key is angled in one or both an x-axis and a y-axis relative to a top surface of the at least one key which forms an x-y plane. 
     
     
       14. A computing device as recited in  claim 12 , wherein the reflective blaze structure comprises a multi-faceted reflective surface with each of a plurality of the facets providing a different surface orientation. 
     
     
       15. A computing device as recited in  claim 1 , wherein the at least one key further includes an outer layer including a diffusion layer provided over the angled reflective surface, and
 wherein the diffusion layer operates to diffuse light to provide a general illumination as opposed to a direct reflection of images being depicted by light from the display. 
 
     
     
       16. A method for illuminating keys of a portable computing device using light from a display associated with the portable computing device, the method comprising:
 providing one or more keys, each of the one or more keys having at least a key cap, with the key cap having a top surface that includes an angled reflective surface, the angled reflective surface being selectively patterned or covered to yield a reflective legend on the top surface of the key cap; 
 receiving, at the one or more keys, at least a portion of light emitted from the display and directed toward the one or more keys; 
 reflecting a portion of the light emitted from the display and directed toward the one or more keys via the angled reflective surface of the key cap corresponding to the one or more keys; and 
 providing the reflected light to a user position, 
 wherein the angled reflective surface has a variety of angles in x-axis direction, y-axis direction, or both directions for different reflective surfaces. 
 
     
     
       17. A method as recited in  claim 16 , wherein the angled reflective surface includes at least a reflective blaze structure. 
     
     
       18. A method as recited in  claim 16 , wherein the angled reflective surface comprises a reflective sawtooth-shaped groove profile. 
     
     
       19. A method as recited in  claim 16 , wherein the light emitted from the display is provided by a backlight. 
     
     
       20. A computing device, comprising:
 a display for presenting displayed data; and 
 at least one key configured to facilitate user input to the computing device, the at least one key including at least a key cap, the key cap having a top surface and including a reflective blaze thereon, the reflective blaze structure being selectively patterned or covered to yield a reflective legend on the top surface of the key cap, 
 wherein the display emits light towards the at least one key, and wherein a portion of the light emitted from the display is reflected by the reflective blaze structure and directed toward a user position, and 
 wherein the reflective blaze structure has a variety of angles in x-axis direction, y-axis direction, or both directions for different reflective surfaces. 
 
     
     
       21. A computing device as recited in  claim 20 , wherein the reflective blaze comprises a reflective sawtooth-shaped groove profile, and wherein the reflective sawtooth-shaped groove profile for the at least one key is angled in both an x-axis and a y-axis relative to the top surface of the at least one key which forms an x-y plane. 
     
     
       22. A computing device as recited in  claim 20 , wherein the reflective blaze comprises a reflective sawtooth-shaped groove profile, and wherein the reflective sawtooth-shaped groove profile for the at least one key is faceted in one or both an x-axis and a y-axis relative to the top surface of the at least one key which forms an x-y plane. 
     
     
       23. A computing device as recited in  claim 20 , wherein the reflective blaze comprises a multi-faceted reflective surface with each of the facets providing a different surface orientation. 
     
     
       24. A computing device as recited in  claim 20 ,
 wherein the at least one key further includes an outer layer including a diffusion layer provided over the angled reflective surface, and 
 wherein the diffusion layer operational to diffuse light to provide a general illumination as opposed to a direct reflection of images being depicted by light from the display. 
 
     
     
       25. A non-backlit key of an electronic device, comprising:
 a top surface; and 
 a reflective optical component formed at the top surface and representing a legend, the reflective optical component operable to reflect light in a controlled manner such that the legend of the non-backlit key is more visible in low light conditions, 
 wherein the electronic device is a portable computer having a base portion and a top portion, the top portion including a display, 
 wherein the display, when operable, produces light and a portion of the produced light impinges on and is reflected by the reflective optical component, 
 wherein the reflective optical component comprises a plurality of angled reflective surfaces, and 
 wherein each of the angled reflective surfaces have a variety of angles in x-axis direction, y-axis direction, or both directions for different reflective surfaces. 
 
     
     
       26. A non-backlit key as recited in  claim 25 , wherein the reflective optical component comprises a sawtooth-shaped groove profile. 
     
     
       27. A non-backlit key as recited in  claim 25 , wherein the reflective optical component comprises a layer of reflective ink or paint. 
     
     
       28. A non-backlit key as recited in  claim 25 , wherein the reflective optical component comprises a blaze structure. 
     
     
       29. A non-backlit key as recited in  claim 25 ,
 wherein the reflective optical component comprises a blaze, and 
 wherein the blaze includes a top surface of the key, the blaze having a substantially reflective surface with a non-zero angle in x-axis direction, y-axis direction, or both directions with respect to the top surface of the key. 
 
     
     
       30. A blaze as recited in  claim 29 , wherein the blaze has a repeating angle in a grating which is periodic or aperiodic, in one or both directions. 
     
     
       31. A blaze as recited in  claim 30 , wherein the blaze has a faceted shape with a plurality of facets, and wherein the repeated angle for the blaze is the same angle or different angles for each of the facets. 
     
     
       32. A blaze as recited in  claim 31 , wherein the angles for the blazes are designed to aim light from a display towards a nominal user eye position, and wherein the light being aimed by the blazes is dependent upon the position of the associated key on a keyboard. 
     
     
       33. A key of a keyboard, comprising:
 a key body configured to receive a user input; and 
 a legend disposed on a top surface of the key body, the legend occupying only a portion of the key body, the legend being formed by a reflective material, and the legend including a plurality of angled optical components that enhance visibility of the legend in low light conditions, 
 wherein the angled optical components include a variety of angles in x-axis direction, y-axis direction, or both directions for different reflective surfaces.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to illumination of keys for electronic devices and, more particularly, to illumination of keys for electronic devices using reflected light. 
     2. Description of the Related Art 
     Computing devices, such as notebook computers, mobile phones, netbook computers, e-readers and others, commonly provide one or more keys for user selection. The keys are often provided in a keyboard or keypad. In order for user to see and visually distinguish between the keys, the keys include legends. For example, a given key might be for the character “a”, the number “1” or a symbol “#”. Providing the legends in a color that has a high contrast to a base color of the keys can be helpful to visibility. In some cases, these computer systems can provide backlighting to the keys. The backlighting provides illumination to the keys so that a user can visually distinguish between the keys. Such illumination is particularly useful when the computing devices are used in low light conditions. 
     Unfortunately, however, providing backlighting requires additional circuitry and optical components. Backlighting when active also consumes power and thus renders the computing device less power efficient. Accordingly, there is a continuing need to provide alternative ways to provide illumination of keys for low light conditions. 
     SUMMARY 
     The invention pertains to techniques and apparatus to provide improved visibility to user input devices, such as keys. In low light conditions, key legends can be difficult to distinguish. For example, often keys have legends on them to visually distinguish them from one another, but in low light conditions it can be difficult for users to visually identify the different keys. The legends can be textual and/or graphic. Hence, according to one embodiment, light from a nearby (e.g., attached) display device can be used to provide illumination to the user input devices (e.g., keys). More particularly, in one embodiment, some light from the nearby display device can be directed towards and reflected from the user input devices to enhance visibility of the keys or the legends thereon. As discussed below, the user input devices (e.g., keys) can be configured to enhance reflection of light toward the user and thereby improve visibility of the keys or the legends thereon. Some or all of the user input devices can be configured to include one or more optical components to enhance reflection of light and thereby improve visibility of the keys or the legends thereon. 
     The invention can be implemented in numerous ways, including as a method, system, device, or apparatus. Several embodiments of the invention are discussed below. 
     As a computing device, one embodiment can, for example, include at least a display for presenting displayed data, and at least one key configured to facilitate user input to the computing device. The at least one key including a key structure and an angled reflective surface disposed adjacent the key structure. The angled reflective surface is an optical structure whose function is to aim light toward the user 
     As a method for illuminating keys of a portable computing device using light from a display associated with the portable computing device, one embodiment can, for example, include at least: providing one or more keys with an angled reflective surface; receiving, at the one or more keys, at least a portion of light emitted from the display and directed toward the one or more keys; reflecting a portion of the light emitted from the display and directed toward the one or more keys via the angled reflective surface corresponding to the one or more keys; and providing the reflected light to a user position. 
     As a computing device, one embodiment can, for example, include at least a display for presenting displayed data, and at least one key configured to facilitate user input to the computing device. The at least one key including a key structure and a reflective blaze structure disposed adjacent the key structure. 
     As a non-backlit key of an electronic device, one embodiment can, for example, include at least a top surface, and a reflective optical component formed proximate the top surface and representing a legend. The reflective optical component is operable to reflect light in a controlled manner such that the legend of the non-backlit key is more visible in low light conditions. 
     A blaze for a key according to one embodiment can have a substantially reflective surface with a non-zero angle in x, y, or both with respect to a top surface of the key for the purpose of controllably spreading light across likely user positions and reduce wasting light in directions where a user is seldom located. 
     A key of a keyboard according to one embodiment can include a key body configured to receive a user input, and a legend disposed on the key body. The legend occupies only a portion of the key body, and the legend being formed by a reflective material. The legend also include one or more optical components that enhance visibility of the legend in low light conditions. 
     Other aspects and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention 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. 1A  is a side view of an electronic device according to one embodiment. 
         FIG. 1B  illustrates a top view of a user input region according to one embodiment. 
         FIG. 1C  illustrates a key having a numeric legend (e.g., “5”) provided thereon according to one embodiment. 
         FIG. 1D  illustrates a key having a numeric legend with one or more optical components according to one embodiment. 
         FIG. 2  is a conceptual diagram of an optical arrangement illustrating one embodiment. 
         FIG. 3  is a flow diagram of a key illumination process according to one embodiment. 
         FIG. 4A  is a side view of a reflective key according to one embodiment. 
         FIG. 4B  is a side view of a reflective key according to another embodiment. 
         FIG. 4C  illustrates a reflective optical component according to one embodiment. 
         FIG. 5A  is a side view of a reflective key according to one embodiment. 
         FIG. 5B  is a side view of a reflective key according to another embodiment. 
         FIG. 5C  is a side view of a reflective key according to another embodiment. 
         FIG. 5D  is a perspective view of a reflective key according to another embodiment. 
         FIG. 5E  is a perspective view of a reflective optical component according to one embodiment. 
         FIG. 6  is a flow diagram of a key cap formation process according to one embodiment. 
         FIG. 7A  illustrates an exemplary top surface of a key cap according to one embodiment. 
         FIG. 7B  is a cross-sectional view of a reflective key according to one embodiment. 
         FIG. 7C  is a cross-sectional view of a reflective key according to another embodiment. 
         FIG. 8  is a conceptual diagram of an optical arrangement illustrating another embodiment. 
         FIG. 9  is a flow diagram of a key illumination process according to another embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION 
     The invention pertains to techniques and apparatus to provide improved visibility to user input devices, such as keys. In low light conditions, key legends can be difficult to distinguish. For example, often keys have legends on them to visually distinguish them from one another, but in low light conditions it can be difficult for users to visually identify the different keys. The legends can be textual and/or graphic. Hence, according to one embodiment, light from a nearby (e.g., attached) display device can be used to provide illumination to the user input devices (e.g., keys). More particularly, in one embodiment, some light from the nearby display device can be directed towards and reflected from the user input devices to enhance visibility of the keys or the legends thereon. As discussed below, the user input devices (e.g., keys) can be configured to enhance reflection of light toward the user and thereby improve visibility of the keys or the legends thereon. Some or all of the user input devices can be configured to include one or more optical components to enhance reflection of light and thereby improve visibility of the keys or the legends thereon. 
     Embodiments of the invention are discussed below with reference to  FIGS. 1A-9 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes as the invention extends beyond these limited embodiments. The illustrations provided in these figures are not necessarily drawn to scale; instead, the illustrations are presented in a manner to facilitate presentation. 
       FIG. 1A  is a side view of an electronic device  100  according to one embodiment. The electronic device  100  is, for example, a mobile computing device (e.g., a laptop computer, a notebook computer or a netbook computer), a mobile communication device (e.g., a mobile phone), a digital media playback device (e.g., a DVD player), a health/medical device, or an automotive device. The electronic device  100  includes a base portion  102  and a top portion  104 . The base portion  102  houses at least one printed circuit board together with various electrical components that interoperate to provide an electronic device (e.g., computing device) for either general purposes or specific purposes. The base portion  102  also supports a user input region  106 . The user input region  106  can receive user inputs from the user of the electronic device. For example, the user input region  106  can include a keyboard or keypad having a plurality of keys. The top portion  104  can contain a display device  108 . When operating, the display device  108  produces light for illumination of text or graphics being presented on the display device  108 . While most of the light from the display device  108  is typically emitted normal to the surface of the display device  108 , a portion of the light, referred to as incident light  110 , can also be directed towards the base portion  102 . The portion of the light from the display device  108  that is directed towards the base portion  102  can be reflected from one or more of the keys (e.g., key tops or key caps) of the user input region  106  (e.g., keyboard). Each of one or more of the keys can also include an optical component to increase the amount of reflected light  112 . The reflected light  112  can be directed towards the eyes  114  of a user of the electronic device  100 . Consequently, the reflected light  112  facilitates the user in recognizing legends provided on the keys in the user input region  106  (e.g., keyboard) in low light conditions. 
       FIG. 1B  illustrates a top view of a user input region  106 ′ according to one embodiment. The user input region  106 ′ can include a plurality of keys  116 . The keys  116  can have various sizes, configurations and placements. The keys  116  can be relatively flat or they may include a contoured surface. Each of the keys  116  can have a legend (not shown) associated therewith. Typically, the legend would be provided on a visible surface (e.g., top surface) of the corresponding key. The legend can, for example, be a symbol or character, such as an alphanumeric character or a graphic symbol (e.g. logo, icon, etc.). 
       FIG. 1C  illustrates a key  116 ′ having a numeric legend  118  (e.g., “5”) provided thereon according to one embodiment. In some cases, the legend  118  may be disposed on the top surface of the key  116 ′. In other cases, although the legend  118  is visible to a user, the legend  118  may be embedded within the key  116 ′. For example, the legend  118  may be disposed within or underneath a translucent/transparent layer provided on the outermost top surface of the key  116 ′. 
       FIG. 1D  illustrates a key  116 ″ having a numeric legend  118 ′ with one or more optical components  120  according to one embodiment. The one or more optical components  120  can be engineered redirect light from a light source, such as from a display device. By way of example, the legends  118 ′ may be engineered to reflect light thereby making the legends  118 ′ more visually distinct. In so doing, a dedicated backlight that could illuminates legends on keys may be minimized or even eliminated. This may help reduce the size of an electronic device, i.e., stack up can be reduced which allows devices to be thinner. 
     In the embodiment illustrated in  FIG. 1A , the incident light  110  is from a display device  104 . The display device  104  can be coupled to the base portion  102  as shown in  FIG. 1A . Alternatively, the electronic device  100  may include a light source that is external or decoupled from the electronic device  100 . The external light source can be a display device, a light fixture (e.g., lamp), a portable light, sunlight, moonlight, or ambient light. The light from the light source is received, at least in part, on the user input region  106 . 
       FIG. 2  is a conceptual diagram of an optical arrangement  200  illustrating one embodiment. The optical arrangement  200  can, for example, be used with an electronic device. The optical arrangement  200  includes a light source  202 . The light source  202  produces light that can be utilized to directly illuminate not only a display device that includes the light source  202  but also to indirectly illuminate keys within a key region  204 . The light source  202  is, for example, provided by an integral display screen. For example, the light source  202  can include a backlight of a LCD display screen, OLEDs, or other display technologies. The key region  204  includes a plurality of keys that can be similarly constructed so as to facilitate illumination in low light conditions. In particular, the keys within the key region  204  include key caps  206 . A key cap is considered to be an upper portion or top of a key. 
     The key caps  206  can be modified to facilitate illumination. In particular, according to one embodiment, applied to the top of each of the key caps  206  are a reflective optical component  208  and an outer layer  210 . The reflective optical component  208  can operate to reflect at least a portion of the light  212  from the light source  202  that is incident on the key region  204 . The incident light  212  impinges on the keys caps  206  in the key region  204 , and passes through the output layer  210  and is then partially reflected by the reflective optical component  208  to provide reflected light  214  directed towards the eyes  216  of a user provided at a user position region  218 . The user position region  218  can represent a target zone of user positions for a user&#39;s eyes. The target zone of user positions can reflect most common user positions. Here, the optical arrangement  200  can enhance reflectivity of light from the light source  202  towards the user position  218  via the reflective optical components  208  of the key caps  206 . Advantageously, the tops of the key caps  206 , or the legends provided thereon, can be illuminated to enhance user visibility in low light conditions within the user position region  218 . 
     The outer layer  210  can serve as a protective layer (or protective cover) and/or a diffusion layer. The protective layer and the diffusion layer can be separate layers or combined in a single layer. 
     The protective layer can be provided to protect the reflective optical component  208 . The protective layer can be provided over the reflective optical component  208  which is provided on the key caps  206 . Typically, the outer layer  210  is substantially optically transparent to the incident light  212  and the reflected light  214 . 
     The reflective optical component  208  directs light to a user position. In some implementations, the reflective optical component  208  can scatter incident light somewhat so that diffusion induced by a diffusion layer may not be needed. The diffusion layer, if provided, can operate to diffuse (or scatter) the reflected light  214  such that the illumination on the key caps  206  is diffused so that any images depicted by the light source  202  are diffused and thus the illumination of the key caps  206  provides general illumination as opposed to a direct reflection of images being depicted by the light source  202 . For example, if the light source  202  were part of a display device, and if the display device were to present an image of a mountain on its display with illumination from the light source  202 , then the diffusion layer would diffuse the reflected light  214  so that the mountain would not be recognizable from the reflected light  214  being viewed by the user. 
       FIG. 3  is a flow diagram of a key illumination process  300  according to one embodiment. The key illumination process  300  is, for example, performed by an electronic device (e.g., computing device) having a light source and a key region with one or more keys. For example, the key illumination process  300  can be performed by the electronic device providing the optical arrangement  200  illustrated in  FIG. 2 . 
     The key illumination process  300  provides  302  one or more of the keys in the key region with an optical component. In this embodiment, the optical component is denoted as an angled reflective surface. The one or more keys having the angled reflective surface can receive  304  light emitted from a light source (e.g., a display for the electronic device) at the one or more keys. A portion of the light received at the one or more keys can be reflected  306  via the angled reflective surface. Thereafter, the reflected light can be provided  308  to a user position. As a result, the one or more keys are able to be illuminated using light originating from a light source of the electronic device. The light source can, for example, be a display (screen) of for the electronic device, which can be a portable computer. As such, the key illumination process  300  makes uses of an existing light source (e.g., display device) and thus does not require a dedicated light source (e.g., keyboard backlight). The reflection of the light from the one or more keys is due to the angled reflective surface provided on the one or more keys, which manages the spreading and direction of the light to be reflected to a user of the electronic device. In one implementation, the one or more keys can have key caps as described above with reference to  FIG. 2 . Various suitable structures or arrangements for keys or key caps are detailed below. 
     As discussed in more detail below, the optical component provided  302  with one or more of the keys can include at least one angled reflective surface. The angled reflective surface can be provided on a top portion of the corresponding key. The optical component provided with a given key can also include a plurality of angled reflective surfaces. The plurality of reflective surfaces can be provided with a predetermined arrangement of reflective surfaces (or elements). The predetermined arrangement of reflective surfaces can be implemented with at least one grating structure, a multi-faceted surface, or a plurality of independent surfaces. 
     As noted above, one or more keys of a key region for an electronic device can be provided with an angled reflective surface to enhance illumination of such keys using reflected light from a display. In one implementation, the angled reflective surface can be referred to as a reflective blaze structure. Each of those of the one or more keys can have an angled reflective surface which can be at a different angle for its corresponding angled reflective surface. However, it should be noted that other ones of the keys of the key region can simply be provided with reflective material (i.e., without an optical component such as an angled reflective surface). While a reflective material whether angled or not can reflect light, reflective surfaces that are angled can offer the advantage of being able to reflect greater amounts of light toward the user&#39;s eyes (e.g., provided at a user position region  218 ) while reducing loss of light which is spread into non-user directions. 
       FIG. 4A  is a side view of a reflective key  400  according to one embodiment. In this embodiment, the reflective key  400  can include a key structure  402 , a reflective layer  404  provided on the top surface of the key structure  402 , and a protective layer  406  provided over the reflective layer  404 . The reflective layer  404  can be secured to, adhered to (e.g., bonded to, adhesive, etc.) or integral with the top surface of the key structure. The reflective layer  404  can include a reflective optical component  408 . As shown in  FIG. 4A , the reflective optical component  408  can provide one or more reflective surfaces, which can be referred to as a reflective blaze or blaze structure. The structure can be oriented or configured as desired in any one or more axes x, y and/or z. In one embodiment, the reflective optical component  408  can have a reflective grating, such as a sawtooth-shaped groove profile with a plurality of sawtooth-shaped grooves  410 . The reflective grating can be itself reflective or can be coated with a reflective material. Although the term grating is used, it should be appreciated that a reflective grating can take a variety of forms including periodic or non-periodic, etc. In some cases, the reflective surfaces of a reflective grading may even include some portions that are periodic while others are non-periodic. 
     The thickness of the reflective layer  404  depends upon implementation. However, in one example, the reflective layer  404  can have a thickness of about 1-15 micrometers. The thickness of the protective layer  406  also depends upon implementation. However, in one example, the protective layer  406  can have a thickness of about 8-30 micrometers. The reflective layer  404  illustrated in  FIG. 4  can be patterned directly or indirectly so that an appropriate legend is provided on the key structure  402 . 
     The reflective layer  404  and the protective layer  406  can be provided in various different ways. In one embodiment, either or both of the reflective layer  404  and the protective layer  406  can be applied by being deposited or sprayed on. The deposited or sprayed on solution for the reflective layer  404  can be ink or paint based and include reflective material, such as small pieces of aluminum, silver or compounds (or alloys) thereof. The sprayed on solution for the protective layer  406  can be UV-cured overcoat. In another embodiment, the reflective layer  404  can be applied by a silkscreen process. The protective layer  406  can be provided by a variety of materials. One suitable material for the protective layer  406  is acrylic paint. 
     To form the reflective optical component  408 , an optical component structure can be placed adjacent the top surface of the key structure  402 . The optical component structure can include the plurality of the sawtooth-shaped grooves  410  which can be denoted as the blaze. The optical component structure can be provided by a film or other substrate (e.g., epoxy, cured adhesive) that includes the plurality of sawtooth-shaped grooves  410  formed therein. Also, the sawtooth-shaped grooves  410  shown in  FIG. 4A  are formed with a right-side primary angle. Here, the reflective optical component  408  is oriented to received incident light  412  from the right. The right-side primary angle can be referred to as a blaze angle. 
     Although reflective optical component  408  (e.g., the sawtooth-shaped grooves  410 ) illustrated in  FIG. 4A  can be formed using a reflective layer  404 , it should be noted that, in another embodiment, the reflective optical component  408  could alternatively be integral with or embedded in the upper surface of the key structure  402 . However, a reflective coating could thereafter be applied on the reflective optical component  408  if the upper surface of the key structure  402  were itself already non-reflective, which would typically be the case. 
     The reflective optical component (e.g., the reflective blaze) may be composed of flat or faceted surface segments which are provided at predetermined angles (also known as blaze angles) and are reflective. In the case of a keyboard having a plurality of keys, the predetermined angles for the reflective optical component provided at each of a plurality of the key can vary. The predetermined angles can be described as the angle of the blaze with respect to the plane of the keyboard. The predetermined angles may be positive (toward the display) or negative (toward the user). In a normal laptop computer configuration, one embodiment can have a positive predetermined angle (positive blaze angle), as the user is generally higher from the table than the display is. The positive predetermined angle can control direction of reflected light in a vertical direction relative to the laptop computer. Alternatively or in addition to the control of the vertical direction of the reflective light, the predetermined angle can control direction of reflected light in a horizontal direction relative to the laptop computer. Here, the predetermined angle can tilt keys at the sides of the keyboard towards the user. The predetermined angle (blaze angle) may also be a compound angle. For example, keys at the right hand side of the keyboard may tilt toward the left, redirecting otherwise escaping display light rays back towards the user. Keys at the left hand side of the keyboard may tilt toward the right, redirecting otherwise escaping display light rays back towards the user. 
     In one embodiment, the reflective optical component (e.g., the reflective blaze) provided on each of a plurality of keys can be separately determined. In other words, the predetermined angle to be used with each of the keys can vary across the keyboard so as to control reflection of light from the key legends to a user position. The blaze may also be adjusted in angle from key to key to create the desired uniformity at a viewing from a user position region. The predetermined angle provided on the plurality of keys can also be composed of faceted segments, which spread the light. The use of faceted segments can serve to spread light and thus makes the keyboard appear dimmer, for the purpose of making the range of quality user positions broader. 
       FIG. 4B  is a side view of a reflective key  400 ′ according to another embodiment. In this embodiment, like  FIG. 4A , the reflective key  400 ′ can include the key structure  402 , the reflective layer  404  provided on the top surface of the key structure  402 , and the protective layer  406  provided over the reflective layer  404 . The reflective key  400 ′, however, differs from the reflective key  400  of  FIG. 4A  only with respect to an optical component. Specifically, the reflective layer  404  can include a reflective optical component  408 ′. As shown in  FIG. 4B , the reflective optical component  408 ′ can provide one or more reflective surfaces, which can be referred to as a reflective blaze or blaze structure. In one embodiment, the reflective optical component  408 ′ can have a reflective grating, such as a sawtooth-shaped groove profile with a plurality of sawtooth-shaped grooves  410 . The reflective grating can be itself reflective or can be coated with a reflective material. In this embodiment, the sawtooth-shaped grooves  410 ′ shown in  FIG. 4A  are formed with a left-side primary angle. Here, the reflective optical component  408 ′ is oriented to received incident light  412 ′ from the left. The left-side primary angle can be referred to as a blaze angle. 
       FIG. 4C  illustrates a reflective optical component  450  according to one embodiment. The reflective optical component  450  can also be referred to as a blaze structure. The reflective optical component  450  can include a plurality of sawtooth-shaped grooves  452 . The distance d between each tooth of the sawtooth-shaped grooves  452  can be referred to as a grating constant. Although the specific dimension of the sawtooth-shaped grooves  452  varies with application, in one embodiment a forward angle  454 , which can be referred to as a blaze angle, can about 5-30 degrees, a back angle  456  can be about 10-45 degrees, and the distance d can be about 0.1 mm. In an exemplary specific embodiment, the forward angle (blaze angle) can be about 15 degrees, the back angle can be about 30 degrees, and the distance d can be about 0.1 mm. The reflective optical component  450  can be formed in a substrate (e.g., film, epoxy, adhesive, etc.) and then provided with a reflective coating. The reflective coating can be provided on the substrate by a thin layer of reflective material. The reflective material can be reflective ink, reflective paint, or metal (e.g., aluminum, silver, etc.) that can be sprayed or deposited on the substrate. In any case, the reflective surfaces of the sawtooth-shaped grooves  452  can operate to reflect at least a portion of light  458  from incident light  458 . The incident light  458  impinges on the keys having the sawtooth-shaped grooves  452  and can be reflected as reflected light  460  and directed towards a user position such that legends provided on the keys are brighter to the user in low light conditions. 
       FIG. 5A  is a side view of a reflective key  500  according to one embodiment. In this embodiment, the reflective key  500  can include a key structure  502 , a reflective layer  504  provided on the top surface of the key structure  502 , and a protective layer  506  provided over the reflective layer  504 . The reflective layer  504  can include a reflective optical component  508 . The reflective key  500  is similar to the reflective key  400  illustrated in  FIG. 4A , except that the reflective optical component  508  differs from the reflective optical component  408 . As shown in  FIG. 5A , the reflective optical component  508  can provide one or more reflective surfaces, which can be referred to as a reflective blaze or blaze structure. In one embodiment, the reflective optical component  508  can have a plurality of angled reflective surfaces  510 , with some or none or all of the angles for the angled reflective surfaces  510  being different from others. Also, as shown in  FIG. 5A , the angled reflective surfaces  510  can be placed in a uniform arrangement (e.g., common blaze angle and separation distance (d) or a non-uniform arrangement (e.g., differing blaze angle and/or separation distance (d). The separation distance (d) can be the same or different in different directions across the surface of a keyboard. The reflective optical component  508  can be itself reflective or can be coated with a reflective material. 
     The reflective layer  504  and the protective layer  506  can be provided in various different ways. In one embodiment, either or both of the reflective layer  504  and the protective layer  506  can be applied by being deposited or sprayed on. The deposited or sprayed on solution for the reflective layer  504  can be ink or paint based and include reflective material, such as small pieces of aluminum, silver or compounds (or alloys) thereof. The sprayed on solution for the protective layer  506  can be UV-cured overcoat. In another embodiment, the reflective layer  504  can be applied by a silkscreen process. The protective layer  506  can be provided by a variety of materials. One suitable material for the protective layer  506  is acrylic paint. 
     To form the reflective optical component  508 , an optical component structure can be placed adjacent the top surface of the key structure  502 . The optical component structure can include the plurality of angled reflective surfaces  510  which can be denoted as the blaze. In this embodiment, the reflective optical component  508  has a plurality of sawtooth-shaped grooves which are not uniformly spaced and which have different angles for at least some of the angled reflective surfaces. In this example shown in  FIG. 5A , two of the sawtooth-shaped grooves have the same angled reflective surface, and one of the sawtooth-shaped groves has a different angled reflective surface (smaller angle). The separation distance between each tooth also varies in this example with the separation being larger for the tooth with the smaller angle. The optical component structure can be provided by a film or other substrate (e.g., epoxy, cured adhesive) that includes the plurality of angled reflective surfaces  510  formed therein. The resulting reflective optical component  508  can be engineered with appropriately positioned and angled reflective surfaces  510  to yield desired optical properties. 
       FIG. 5B  is a side view of a reflective key  500 ′ according to another embodiment. In this embodiment, the reflective key  500 ′ is similar to the reflective key  500  illustrated in  FIG. 5A , except that the reflective key  500 ′ include a reflective optical component  508 ′ that is generally faceted in a piece-wise manner with flat segments  510 ′ which offer different angled reflective surfaces. 
       FIG. 5C  is a side view of a reflective key  500 ″ according to another embodiment. In this embodiment, the reflective key  500 ″ is similar to the reflective key  500  illustrated in  FIG. 5A , except that the reflective key  500 ″ includes a reflective optical component  508 ″ that is includes a plurality of different angled reflective surfaces that are formed as sawtooth-shaped grooves. As shown in  FIG. 5C , the orientation of the reflective optical component  508 ″ is itself angled with respect to the orientation of the reflective key  500 ″. As depicted, the reflective optical component  508 ″ is higher on the left side than on the right side. Also, the height of each of the sawtooth-shaped grooves are not necessarily the same height, nor are the angles of the sawtooth-shaped grooves necessarily the same angle. 
     In general, the one or more reflective surfaces provided to a legend to be visibly to a user can be provided at different heights related to each other (z height), and/or can be angled with respect to or about x-axis or y-axis. Hence, each reflective surface can be placed at a defined x, y, and z position. 
       FIG. 5D  is a perspective view of a reflective key  500 ′″ according to another embodiment. In this embodiment, the reflective key  500 ′″ is similar to the reflective key  500  illustrated in  FIG. 5A , except that the reflective key  500 ′″ includes a reflective optical component  508 ′″ that can include a plurality of uniformly angled reflective surfaces that are formed as sawtooth-shaped grooves similar to than shown in  FIG. 4A . As shown in  FIG. 5D , the orientation of the reflective optical component  508 ′″ is itself angled in two dimensions with respect to the plane of the protective layer  506  or the top of the key structure. Here, in generally, it should be noted that the reflective optical component  508 ′″, regardless of the configuration of the one or more angled reflective surfaces being provided, can be skewed in orientation with respect to one or two axes of the plane formed by the protective layer  506  or the top of the key structure. 
     In addition to the grove implementation shown in  FIG. 5D , where the sawtooth shape is evident in a diagonal cross section, another embodiment allows an additional sawtooth shape in, for example, a perpendicular cross section. In this case each blaze structure can be approximately square, with an angle designed to enhance (or even optimize) reflected light to the user. The direction of the repeated pitch may be along or perpendicular to the groves in  FIG. 5D , or the repeated pitch may be along or perpendicular to a side of the key, for example. 
       FIG. 5E  is a perspective view of a reflective optical component  550  according to one embodiment. The reflective optical component  550  is a three-dimensional structure having a plurality of angled reflective surfaces  552 , which can be referred to as facets. The angled reflective surfaces  552  can be flat reflective surfaces (or flat reflective segments). Each of the facets  552  can be used to direct light in a particular direction. These facets  552  (which can be referred to as faceted blazes) can each has multiple reflective surfaces, such as repeated in a sawtooth fashion, along any two directions and not necessarily normal to each other. 
     In accordance with one embodiment, the facets of the reflective optical component  550  can be referred to more generally as nodes. These nodes, like the facets, are reflective surfaces provided with a key (or other user input mechanism). The nodes can be contiguously formed or arranged as shown in  FIG. 5E . However, in another embodiment, the nodes can be formed or arranged such that the nodes are not contiguously formed or arranged. For example, discrete nodes can be formed or provided with a key to provide the desired reflectivity. These nodes can be positioned, sized, and angled to specific x, y and z coordinates to reflect light to a target user viewing position. By engineering nodes for desired optical properties, such as reflectivity, legends provided on the corresponding key can be configured to direct light to a user so that the legends are more visible in low light conditions. The configuration can, for example, be curvilinear, rectilinear, stepped, sawtoothed, or any combination thereof. Each node can be engineered to reflect light in a predetermined select manner. 
       FIG. 6  is a flow diagram of a key cap formation process  600  according to one embodiment. The key cap formation process  600  is, for example, to form a key cap for used as a key for an electronic device (e.g., computing device). The electronic device can include not only a key region with one or more keys but also a display that can serve as a light source to illuminate the one or more keys. 
     The key cap formation process  600  can initially determine  602  a legend to be provided on a key cap. For example, the legend can be associated with an alphanumeric character or a graphic symbol (e.g. logo, icon, etc.). After the legend to be provided has been determined  602 , a decision  604  can determine whether an angled reflective effect (e.g., blaze effect) is to be provided to the legend. When the decision  602  determines that an angled reflective effect is to be provided, then the legend is formed  606  with an angled reflective structure (e.g., blaze structure) on the key cap. Thereafter, a protective cover can be placed  608  on the key cap over the legend. Alternatively, when the decision  604  determined that an angled reflective effect is not to be provided to the legend, the legend can be formed  610  on the key cap without providing any angled reflective structure. As an example, the legend formed  610  would be formed using a reflective layer that does not include an angled reflective structure, such as a blaze structure. Following the block  610 , the key cap formation process  600  can proceed to the block  608  where a protective cover can be placed on the key cap over the legend. Following the block  608 , the key cap formation process  600  can end. 
       FIG. 7A  illustrates an exemplary top surface of a key cap  700  according to one embodiment. The key cap  700  includes a top surface  702 . The top surface  702  of the key cap  700  illustrates a reflective legend  704 . The reflective legend  704  is formed from a reflective material that includes an angled optical component. In the example shown in  FIG. 7A , the reflective legend  704  shown has an “O” shape. A protective layer  706  can be provided on the top surface  702  over the reflective legend  704 . The protective layer  706  typically covers at least the reflective legend  704  but also may cover the entire top surface  702  of the key cap  700 . The protective layer  706  serves to protect the reflective legend  704 . The protective layer  706  can be a substantially transparent layer or coating. In one embodiment, the protective layer  706  also provides some diffusion to mask reflection of screen images from a display device operating as a light source. 
       FIG. 7B  is a cross-sectional view of a reflective key  700 ′ according to one embodiment. In one embodiment, the reflective key  700 ′ can be opaque, such as a particular color (e.g., black). The reflective key  700 ′ can also include an inner opening (or hollow portion)  701 . The reflective key  700 ′ can include an angled reflective component  704  provided on the top surface  702 . The angled reflective component  704  can include a blaze structure  708 . In the embodiment illustrated in  FIG. 7B , the blaze structure  708  can include a plurality of sawtooth-shaped grooves. 
     The angled reflective component  704  can be formed from or include a reflective material. The reflective material can be provided by a broad spectrum reflective material. For example, the reflective material can be formed of aluminum, silver or compounds (or alloys) thereof. In particular, the reflective material can be an ink or paint having aluminum or silver fragments therein. One suitable ink is a mirror effect ink from Seiko Advance Ltd. of Tokyo, Japan. One suitable paint is a mirror effect paint from PPG Industries, Inc. of Pittsburgh, Pa. 
     In addition, the protective layer  706  can be provided over the angled reflective component  704  (including the blaze structure  708 ). The protective layer  706  is a thin protective coating. The protective layer  706  is at least partially if not fully translucent. The protective layer  706  can be clear in color and may also include glass particles or other clear materials (e.g., acrylic particles) to provide diffusion. The glass particles can, for example, be fibers or spheres. The thickness of the blaze structure  708  and the protective layer  706  depend upon implementation. However, in one example, the blaze structure  708  can have a thickness of about 1-15 micrometers. The thickness of the protective layer  706  depends upon implementation. However, in one example, the protective layer  706  can have a thickness of about 15-30 micrometers, or in a more particular example about 20-22 micrometers. 
       FIG. 7C  is a cross-sectional view of a reflective key  700 ″ according to another embodiment. The reflective key  700 ″ can be opaque, such as a particular color (e.g., black). The reflective key  700 ″ can also include an inner opening (or hollow portion)  701 . The reflective key  700 ″ can include a reflective optical layer  710  provided on the top surface  702 . The reflective optical layer  710  can include a blaze structure  712  which can include a plurality of reflective surfaces (e.g., a plurality of sawtooth-shaped grooves). 
     The reflective optical layer  710  can be provided from or include a reflective material. The reflective material can be provided by a broad spectrum reflective material. For example, the reflective material can be formed of aluminum, silver or compounds (or alloys) thereof. In particular, the reflective material can be an ink or paint having aluminum or silver fragments therein. One suitable ink is a mirror effect ink from Seiko Advance Ltd. of Tokyo, Japan. One suitable paint is a mirror effect paint from PPG Industries, Inc. of Pittsburgh, Pa. 
     Additionally, a patterned layer  714  can be provided over portions of the reflective optical layer  710 . The patterned layer  714  is typically an opaque layer, for example, black. The patterned layer  714  can be provided so as to cover at least a portion of the top of the reflective key  700 ″ so that only select portions of the reflective optical layer  710  remain visible. Those portions of the reflective optical layer  710  not covered by the patterned layer  714 , namely, the blaze structure  712 , yield the desired legend for the reflective key  700 ″. The thickness of the patterned layer  714  also depends upon implementation. However, in one example, the patterned layer  714  can have a thickness of about 8-15 micrometers, or in a more particular example about 9-11 micrometers. 
     In one embodiment, the patterned layer  714  provides a mask layer that can be disposed over the reflective optical layer  710  (which provides an angled reflective surface). The mask layer provides a mask that covers at least portions of the angled reflective surface. Those portions of the angled reflective surface not being covered by the mask form a reflective legend on the at least one key. 
     The patterned layer  714  has a pattern that it is formed when the patterned layer  714  is initially applied, or formed into a layer that is initially applied. In one implementation, a layer is patterned when formed. For example, the layer can be sprayed, silk-screened or deposited (e.g., PVD) on in the desired pattern. In another implementation, the layer can be formed and then be patterned. For example, chemical etching or laser ablation can be used to pattern the layer. 
     After the patterned layer  714  has been applied, a protective layer  716  can be provided over the patterned layer  714 . The protective layer  716  can protect the reflective legend that results from the reflective layer  710  and the patterned layer  714 . The protective layer  716  is a thin protective coating. The thickness of the protective layer  716  depends upon implementation. However, in one example, the protective layer  716  can have a thickness of about 15-30 micrometers, or in a more particular example about 20-22 micrometers. The protective layer  716  can also provide diffusion, in which case it can include diffusing materials. The protective layer  716  can be applied by being sprayed on. The sprayed on solution for the protective layer  716  can be ink or paint based and is typically clear (e.g., clear acrylic paint, clear resin) and may also include the diffusing materials. The gloss level (or diffusion effect) of the protective layer  716 , if diffusion is being provided, can be controlled to limit gloss level (e.g., to about 5 gloss units). 
     The patterned layer  714  has a pattern that it is formed when the patterned layer  714  is initially applied, or formed into a layer that is initially applied. In one implementation, a layer is patterned when formed. For example, the layer can be sprayed, silk-screened or deposited (e.g., PVD) on in the desired pattern. In another implementation, the layer can be formed and then be patterned. For example, chemical etching or laser ablation can be used to pattern the layer. 
     The reflective optical component  704  or the reflective optical component  710  discussed herein can be applied as ink or paint as noted above. Alternatively, the reflective layer or mirror elements can be applied by Physical Vapor Deposition (PVD) if formed of metal, such as silver or aluminum. In such case the thickness of the reflective layer or mirror elements can be as thin as one (1) micrometer or less. 
     Optionally, as noted above, the reflected portion of the light received at the one or more keys can also be diffused. The diffusion can be provided by a layer of diffusive material provided over the reflective optical component. A protective layer can also include diffusive material to provide diffusion. 
       FIG. 8  is a conceptual diagram of an optical arrangement  800  illustrating another embodiment. The optical arrangement  800  can, for example, be used with an electronic device. The optical arrangement  800  includes a light source  802 . The light source  802  produces light that can be utilized to illuminate not only a display device but also keys within a key region  804 . The light source  802  is, for example, provided by a backlight of a LCD display screen. The key region  804  includes a plurality of keys that can be similarly constructed so as to facilitate illumination in low light conditions. In particular, the keys within the key region  804  include key caps  806 . A key cap is considered to be an upper portion or top of a key. 
     The optical arrangement  800  is similar to the optical arrangement  200  illustrated in  FIG. 2 . However, unlike the optical arrangement  200 , the optical arrangement  800  provides one or more of the keys, or their blaze angle design targets, at a determined orientation so as to contribute in directing light from the light source  802  to the user position. As shown in  FIG. 8 , at least the outer keys in the key region  804  are oriented or angled inward, which tends to direct reflected light more towards a higher user position relative to the key region  804 . Alternatively, in another embodiment, at least the outer keys in the key region  804  are oriented or angled outward, which tends to direct reflected light more towards a lower user position relative to the key region  804 . 
       FIG. 8  shows the keys (or at least the keycaps thereof) being angled, but in another embodiment, the keycaps are unchanged from the conventional keyboard (i.e., not angled), but blaze angles are modified from an idea so that light can be aimed to a broader range of user positions. Keys at the left in  FIG. 8  can have blaze structures designed to aim light above a nominal user position and keys at the right in  FIG. 8  can have blaze structures designed to aim light below the nominal user position. Similarly, keys at the left in  FIG. 8  can have blaze structures designed to aim light below the nominal user position and keys at the right in  FIG. 8  can have blaze structures designed to aim above below the nominal user position. Similarly, in the other angular direction, keys at the user&#39;s left side of the keyboard (e.g., the “A” key) can have blaze structures designed to aim light to the left eye (or farther to the nominal user&#39;s left), and keys at the right side of the keyboard can have blaze structures design to aim light to the right eye (or farther to the nominal user&#39;s right). Similarly, keys at the user&#39;s left side of the keyboard (e.g., the “A” key) can have blaze structures designed to aim light to the right eye (or farther to the nominal user&#39;s right), and keys at the right side of the keyboard can have blaze structures design to aim light to the left eye (or farther to the nominal user&#39;s left). In this way, light from a display can be reflected to more different user&#39;s positions, and thus means are available to design uniformity of the keyboard&#39;s reflection brightness. This design approach can be used instead of a faceted blaze or in addition to a faceted blaze. This design approach can be used instead of varying a key&#39;s blaze angles across a key, or in addition to varying a key&#39;s blaze angles across a key. 
     Besides orienting the keys, as discussed above, the key caps  806  can be modified to facilitate illumination. In particular, according to one embodiment, applied to the top of each of the key caps  806  is a reflective optical component  808  and an outer layer  810 . The reflective optical component  808  can operate to reflect at least a portion of the light  812  from the light source  802  that is incident on the key region  804 . The incident light  812  impinges on the keys caps  806  in the key region  804 , and passes through the output layer  810  and is then partially reflected by the reflective optical component  808  to provide reflected light  814  directed towards the eyes  816  of a user. 
     The outer layer  810  can serve as a protective layer (or protective cover) and/or a diffusion layer. The protective layer and the diffusion layer can be separate layers or combined in a single layer. 
     The protective layer can be provided to protect the reflective optical component  808 . The protective layer can be provided over the reflective optical component  808  which is provided on the key caps  806 . Typically, the outer layer  810  is substantially optically transparent to the incident light  812  and the reflected light  814 . 
     The reflective optical component  808  direct light to a user position. In some implementation, the reflective optical component  808  can scatter incident light somewhat so that diffusion induced by a diffusion layer many not be needed. The diffusion layer, if provided, can operate to diffuse (or scatter) the reflected light  814  so that the illumination on the key caps  806  is diffused so that any images depicted by the light source  802  are diffused and thus the illumination of the key caps  806  provides general illumination as opposed to a direct reflection of images being depicted by the light source  802 . 
     In general, each of the keys can be formed such that incident light  812  from the light source  802  can direct the reflected light to the user position using one or more reflective surfaces on the corresponding key. The one or more reflective surfaces can be angled to enhance illumination of key legends in low light conditions. The angle of the one or more reflective surface depends on the reflective optical component  808  provide on a given key as well on any orientation angle due to the orientation of the given key. A given key may also have multiple different angles for its multiple reflective surfaces. 
     Accordingly, user input portion can pertain to a key region having plurality of keys (or key caps). The keys and/or legends thereon can be engineered to direct light to a target user viewing area  818  (e.g., area where the user is typically positioned when using the electronic device having the optical arrangement  800 ). In one embodiment, the user input portion as whole may be tilted or angled relative to a base or housing to direct light to the target user viewing area  818 . Alternatively or additionally, different portions of the user input region may be tilted or angled relative to the base or housing and/or relative to each other to direct light to the target user viewing area  818 . By way of example, keys within the key region can be grouped into different sections and each of these sections can tilted or angled differently than other groups of inputs. In one example, the keys can be grouped into left and right, each angled opposite the other, but both angled so as to direct light to the target user viewing area  818 . In another example, the keys can be grouped into upper and lower and each of these groups with different angles so as direct light to the target user viewing area  818 . In yet another example, the keys can be broken up into quadrants or any other type of configuration that helps direct light to the target user viewing area  818 . For example, with four quadrants, the upper/left, upper/right, lower/left and lower/right may be angled differently. Alternatively or additionally, the keys may be tilted or angled relative to the base or housing and/or relative to each other to direct light to the target user view area  818 . For example, each key may have its own angle or plurality of angles. Alternatively or additionally, the legends themselves may be tilted or angled relative to the key to direct light to the target user viewing area  818 . For example, the legends may have reflective surfaces at a different angle than that of the key. Additionally or alternatively, the legends may be engineered with a variety of shapes or contours to direct light. For example, the legends may be rectilinear and/or curvilinear. Examples include convex, concave, waved, and/or the like. The optical behavior of the legends may be affected by its placement with it corresponding key. For example, in cases where the legend is embedded within a translucent/transparent layer, the optical properties may be modified to compensate for light bending may occur through this layer. 
       FIG. 9  is a flow diagram of a key illumination process  900  according to another embodiment. The key illumination process  900  is, for example, performed by an electronic device (e.g., computing device) having a light source and a key region with one or more keys. For example, the key illumination process  900  can be performed by the electronic device providing the optical arrangement  200  illustrated in  FIG. 2  or the optical arrangement  800  illustrated in  FIG. 8 . The key illumination process  900  is similar to the key illumination process  300  except that the reflective blaze structure is a blaze structure and reflected light is also diffused. 
     The key illumination process  900  provides  902  one or more of the keys in the key region with a blaze structure as its optical component. The one or more keys having the blaze structure can receive  904  light emitted from a light source (e.g., a display for the electronic device) at the one or more keys. A portion of the light received at the one or more keys can be reflected  906  via the blaze structure. Thereafter, the reflected light can be diffused  908  and then provided  910  to a user position. As a result, the one or more keys are able to be illuminated using light originating from a light source of the electronic device. The light source can, for example, be a display (screen) for the electronic device, which can be a portable computer. As such, the key illumination process  900  makes uses of an existing light source (e.g., display device) and thus does not require a dedicated light source. The reflection of the light from the one or more keys is due to the blaze structure provided on the one or more keys. The diffusion  908  is optional and can be provided by a diffusive layer provided on the blaze structure. 
     As noted above, one or more keys of a key region for an electronic device can be provided with a reflective optical component (e.g., blaze structure) to enhance illumination of such keys using reflected light from a display. However, it should be noted that other ones of the keys of the key region can simply be provided with reflective material (i.e., without an optical component). While both the reflective material and the reflective blaze structure are able to reflect light, the reflective optical component can offer the advantage of being able to reflect greater amounts of light. Hence, in the case of a keypad of a portable computer, reflective optical components can be used on those key caps that would otherwise reflect less incident light, such as keys at sides and rear which tend to receive and reflect less incident light. 
     Although the techniques described above primarily concern reflective legends for user input device, such as keys, in other embodiments, the techniques described herein can be use to provide other reflective markings that would advantageously be more visible in low light conditions. In general, the reflective markings, or annotations, provided on products can be textual and/or graphic. The marking can be provided for informational, cosmetic and/or functional reasons. For example, the markings can be used to provide a product (e.g., a product&#39;s housing) with certain information. The marking can, for example, be use to label the product with various information. When a marking includes text, the text can provide information concerning the product (e.g., electronic device). For example, the text can include one or more of: name of product, trademark or copyright information, design location, assembly location, model number, serial number, license number, agency approvals, standards compliance, electronic codes, memory of device, and the like. When a marking includes a graphic, the graphic can pertain to a logo, a certification mark, standards mark or an approval mark that is often associated with the product. The marking can be used for advertisements to be provided on products. The markings can also be used for customization (e.g., user customization) of a housing of a product. 
     Although the embodiments described herein do not require changes to a display device or keys, in some embodiments, it may be useful to alter the physical configuration of the display device or keys. For example, the display device could be altered such that a portion of its emitted light is incident on the keys to be illuminated. Also, for example, the keys could be altered to allow them to more efficiently receive the light emitted from the display device. For instance, the structure for the key could be angled toward the display device. 
     Additionally, although embodiment described herein can be used to obviate the need for lighting to keys of a keyboard, such as key or keyboard backlighting. However, in some embodiments it may be desirable to not only provide enhanced illumination of keys in low light conditions through enhanced usage of reflected light as discussed above, but also provide additional lighting to the keys, such as backlighting. In one implementation, the key body can be at least partially transparent or clear and the mostly reflective ink may also allow transmitted light, so that such a key or keyboard may also be backlit. 
     Additional details on enhancing keycap visibility in low light conditions can be found in U.S. patent application Ser. No. 12/853,176, filed Aug. 9, 2010 and entitled “ ” METHOD AND APPARATUS FOR ENHANCING KEYCAP LEGEND VISIBILITY IN LOW LIGHT CONDITIONS, which is hereby incorporated herein by reference. 
     The various aspects, features, embodiments or implementations of the invention described above can be used alone or in various combinations. 
     Different aspects, embodiments or implementations may, but need not, yield one or more of the following advantages. One advantage is that legends or marking can be made reflective with appropriate diffusion so that the legends or markings can be visible in low light conditions. Optical components can also be used for enhanced reflectivity. Another advantage is that backlight is not need needed for keys (e.g., key boards or keypads) if the legends on the keys are made suitably reflective. Here, additional components to support backlighting are not needed and thus electronic device can potentially be made thinner. Still another advantage is that keys can be provided with reflective legends in a manner that renders the legends durable, protected and with reliable adhesion. 
     The many features and advantages of the present invention are apparent from the written description. Further, since numerous modifications and changes will readily occur to those skilled in the art, the invention should not be limited to the exact construction and operation as illustrated and described. Hence, all suitable modifications and equivalents may be resorted to as falling within the scope of the invention.

Metadata:
Filing Date: 20101220
Publication Date: 20151117
Grant Date: 20151117
Priority Date: 20101220
Inventors: MAHOWALD PETER H.
MOLLER RONALD J.
HANKEY M. EVANS
ANDRE BART K.
DIONELLO RAFAEL
Assignee: APPLE INC
CPC Classifications: [{"code": "H01H2221/0702", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/03", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H13/83", "inventive": false, "first": false, "tree": "[]"}, {"code": "F21V7/048", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/056", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01H2219/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2221/0702", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/03", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H13/83", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": true, "tree": "[]"}, {"code": "F21V7/048", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": true, "tree": "[]"}, {"code": "H01H2219/056", "inventive": false, "first": false, "tree": "[]"}, {"code": "F21V7/048", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2221/0702", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H13/83", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/03", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H01H2219/056", "inventive": false, "first": false, "tree": "[]"}, {"code": "G06F3/0202", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 46233719