PATENT DOCUMENT

Publication Number: US-10018891-B2
Application Number: US-201414192665-A
Country: US
Kind Code: B2

Title: Integrated camera window

Abstract:
Apparatus, systems and methods for camera integration with cover glass and for processing cover glass to provide a camera window for an electronic device are disclosed. A camera window can be integrated into the cover glass. The apparatus, systems and methods are especially suitable for cover glasses, or displays (e.g., LCD displays), assembled in small form factor electronic devices such as handheld electronic devices (e.g., mobile phones, media players, personal digital assistants, remote controls, etc.). The apparatus, systems and methods can also be used for cover glasses or displays for other relatively larger form factor electronic devices (e.g., portable computers, tablet computers, displays, monitors, televisions, etc.).

Claims:
What is claimed is: 
     
       1. A consumer electronic product, comprising:
 a housing; 
 electrical components disposed at least partially internal to the housing, said electrical components including at least a camera; and 
 a cover glass coupled to the housing, the cover glass comprising a transparent camera window and an adjacent glass region that is integrally dark or opaque, the transparent camera window extending through the cover glass and having sides, the camera being arranged at least partially internal to the housing and adjacent to the transparent camera window, sides of the adjacent glass region being adjacent the sides of the transparent camera window with no intervening structural material, and the adjacent glass region being sufficiently dark or opaque for substantially reducing glare at the camera via the cover glass. 
 
     
     
       2. The consumer electronic product as recited in  claim 1  wherein the cover glass has a substantially smooth exterior surface extending over the transparent camera window and the adjacent glass region. 
     
     
       3. The consumer electronic product as recited in  claim 1  wherein the cover glass has an exterior surface that is lapped to be planar over the transparent camera window and the adjacent glass region. 
     
     
       4. A consumer electronic product as recited in  claim 1  wherein the transparent camera window comprises glass. 
     
     
       5. A consumer electronic product as recited in  claim 1  wherein the transparent camera window comprises plastic. 
     
     
       6. The consumer electronic product as in  claim 1  wherein the adjacent region of the cover glass comprises a majority region of the cover glass, and wherein the transparent camera window comprises a minority region of cover glass arranged adjacent to the camera. 
     
     
       7. The consumer electronic product as recited in  claim 1  wherein the transparent camera window comprises a peripheral region of cover glass adjacent to the camera. 
     
     
       8. The consumer electronic product as recited in  claim 1  wherein the cover glass substantially overlaps the camera. 
     
     
       9. The consumer electronic product as recited in  claim 1  wherein the electrical components further comprise an illuminator; and wherein the cover glass is substantially transparent to the illuminator and arranged so that illumination projects outwardly from the cover glass. 
     
     
       10. The consumer electronic product as recited in  claim 9  wherein the cover glass substantially overlaps the camera. 
     
     
       11. The consumer electronic product as in  claim 10  wherein the adjacent region of the cover glass comprises a majority region of the cover glass, and wherein the transparent camera window comprises a minority region of cover glass arranged adjacent to the camera. 
     
     
       12. The consumer electronic product as recited in  claim 11  wherein the transparent camera window comprises a peripheral region of cover glass adjacent to the camera. 
     
     
       13. The consumer electronic product as recited in  claim 11 , wherein the adjacent glass region being in direct contact with one or more of the sides of the transparent camera window. 
     
     
       14. The consumer electronic product as recited in  claim 1 , wherein the adjacent glass region being in direct contact with one or more of the sides of the transparent camera window. 
     
     
       15. A method for assembling an electronic product, the electronic product having a housing and including a camera within the housing, the housing including a glass cover, the method comprising:
 disposing a transparent camera window in an aperture in the cover glass; 
 lapping the transparent camera window and an adjacent glass region of the cover glass into a planar exterior surface of the cover glass, the transparent camera window extending through a thickness of the cover glass and having sides, sides of the adjacent glass region being adjacent the sides of the transparent camera window with no intervening structural material, and the adjacent glass region being sufficiently dark or opaque through its depth for substantially reducing glare at the camera via the cover glass; and 
 subsequently attaching the cover glass to a housing for the electronic product, wherein the transparent camera window is provided adjacent to the camera. 
 
     
     
       16. The method as recited in  claim 15  wherein the adjacent glass region of the cover glass comprises a majority region of the cover glass, and wherein the transparent camera window comprises a minority region of cover glass arranged adjacent to the camera. 
     
     
       17. The method as recited in  claim 15  wherein the cover glass has a substantially smooth exterior surface extending over the transparent camera window and the adjacent glass region. 
     
     
       18. The method as recited in  claim 15  wherein the transparent camera window comprises glass. 
     
     
       19. The method as recited in  claim 15  wherein the cover glass substantially overlaps the camera. 
     
     
       20. The method as recited in  claim 15 ,
 wherein the adjacent glass region of the cover glass comprises a majority region of the cover glass, and wherein the transparent camera window comprises a minority region of cover glass arranged adjacent to the camera, 
 wherein the cover glass has a substantially smooth exterior surface extending over the transparent camera window and the adjacent glass region, and 
 wherein the transparent camera window comprises glass. 
 
     
     
       21. The method as recited in  claim 20 , wherein the adjacent glass region being in direct contact with one or more of the sides of the transparent camera window. 
     
     
       22. The method as recited in  claim 15 , wherein the adjacent glass region being in direct contact with one or more of the sides of the transparent camera window.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a divisional of U.S. application Ser. No. 13/347,430, filed Jan. 10, 2012, from which priority is claimed, and the content of which is hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates generally to processing glass. More particularly, the present invention relates to processing cover glass used in portable electronic devices. 
     Conventionally, small form factor devices, such as handheld electronic devices, have a display arrangement that includes various layers. The various layers include at least a display technology layer, and may additionally include a sensing arrangement and/or a cover window disposed over the display technology layer. By way of example, the display technology layer may include or pertain to a Liquid Crystal Display (LCD) that includes a Liquid Crystal Module (LCM). The LCM generally includes an upper glass sheet and a lower glass sheet that sandwich a liquid crystal layer therebetween. The sensing arrangement may be a touch sensing arrangement such as those used to create a touch screen. For example, a capacitive sensing touch screen can include substantially transparent sensing points or nodes dispersed about a sheet of glass (or plastic). In addition, the cover window, which is typically designed as the outer protective barrier, may be glass or plastic. However, glass tends to provide a better protective barrier given its strength and scratch resistance. 
     Further, rapid improvements in size and cost of digital camera technology have lead to integration of one or more digital cameras into various portable electronic devices. While such integration provides convenience in having camera functionality available, often quality of images or video captured by such integrated cameras suffers. Moreover, although images or video of dark scenes could benefit from a flash or other illumination, for various reasons including integration difficulties, flash or other illumination are often omitted from portable electronic devices. 
     Thus, in electronic devices there is a continuing need for improved approaches for camera integration with glass cover arrangements. 
     SUMMARY 
     Apparatus, systems and methods for camera integration with cover glass and for processing cover glass to provide a camera window for an electronic device are disclosed. A camera window can be integrated into the cover glass. The apparatus, systems and methods are especially suitable for cover glasses, or displays (e.g., LCD displays), assembled in small form factor electronic devices such as handheld electronic devices (e.g., mobile phones, media players, personal digital assistants, remote controls, etc.). The apparatus, systems and methods can also be used for cover glasses or displays for other relatively larger form factor electronic devices (e.g., portable computers, tablet computers, displays, monitors, televisions, etc.). 
     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 consumer electronic product, one embodiment can include at least a housing and electrical components disposed at least partially internal to the housing, wherein the electrical components including at least a camera. A cover glass can be coupled to the housing. The cover glass can have a substantially smooth exterior surface comprising a transparent region substantially encircled by an optical barrier perimeter. The camera can being arranged adjacent to the transparent region and within the optical barrier perimeter so that the transparent region of the cover glass is substantially transparent to the camera. The optical barrier perimeter can be interposed within the cover glass between the camera and an adjacent region of the cover glass for reducing glare at the camera via the cover glass. 
     As a consumer electronic product, another embodiment can include at least a housing and electrical components disposed at least partially internal to the housing, wherein the electrical components include at least a camera. A cover glass can be coupled to the housing. The cover glass can comprise a chemically strengthened glass camera window and an optical barrier. The camera can be arranged adjacent to the chemically strengthened glass camera window. The optical barrier can be interposed within the cover glass between the camera and an adjacent region of the cover glass for reducing glare at the camera via the cover glass. 
     As consumer electronic product, another embodiment can include at least a housing and electrical components disposed at least partially internal to the housing, wherein the electrical components include at least a camera. A cover glass can be coupled to the housing. The cover glass can comprise a transparent camera window and an adjacent glass region that is dark or opaque. The camera can be arranged adjacent to the transparent camera window. The adjacent glass region can be sufficiently dark or opaque for substantially reducing glare at the camera via the cover glass. 
     As consumer electronic product, still another embodiment can include at least a housing and electrical components disposed at least partially internal to the housing, wherein the electrical components include at least a camera. A cover glass can be coupled to the housing. The cover glass can comprise a camera window and an optical barrier. The camera can be arranged adjacent to the camera window. The optical barrier can comprise an optical barrier perimeter substantially encircling the camera window, and the optical barrier perimeter can comprise a layer of material applied by physical vapor deposition. 
     As a method for assembling an electronic product, one embodiment includes at least the acts of: forming an aperture in a cover glass, disposing a transparent camera window in the cover glass, and lapping the transparent camera window and an adjacent glass region of the cover glass into a planar exterior surface of the cover glass. Additionally, if desired, the method can further include the acts of disposing the transparent camera window adjacent to a camera, and subsequently attaching the cover glass to a housing for the electronic product. 
     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: 
         FIGS. 1A-1E  show views of one or more embodiments of a consumer electronic product. 
         FIGS. 2A, 2B, 3A, 3B, 4A, 4B, 5A and 5B  show cover glass processing according to one embodiment. 
         FIGS. 6A-6D  are simplified cross sectional views illustrating cover glass processing according to one embodiment. 
         FIGS. 7A-7C  are simplified cross sectional views illustrating cover glass processing according to another embodiment. 
         FIGS. 8A-8C  are simplified cross sectional views illustrating cover glass processing according to another embodiment. 
         FIG. 8D  is a simplified view of another embodiment of a consumer electronic product. 
         FIG. 9  is a diagram showing a detailed partial cross sectional view of chemical strengthening of exposed surface portions of cover glass. 
         FIGS. 10A and 10B  are simplified cross sectional views illustrating chemical strengthening of cover glass according to one embodiment. 
         FIG. 10C  is a simplified view of another embodiment of a consumer electronic product. 
         FIG. 11  is a flow diagram showing an assembly process according to one embodiment. 
     
    
    
     It should be noted that  FIGS. 1-11  are not necessarily drawn to scale. Instead, these figures are enlarged so that features are more readily visible. 
     DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION 
     Apparatus, systems and methods for camera integration with cover glass and for processing cover glass to provide a camera window for an electronic device are disclosed. A camera window can be integrated into the cover glass. The apparatus, systems and methods are especially suitable for cover glasses, or displays (e.g., LCD displays), assembled in small form factor electronic devices such as handheld electronic devices (e.g., mobile phones, media players, personal digital assistants, remote controls, etc.). The apparatus, systems and methods can also be used for cover glasses or displays for other relatively larger form factor electronic devices (e.g., portable computers, tablet computers, displays, monitors, televisions, etc.). 
     Since handheld electronic devices and portable electronic devices are mobile, they are potentially subjected to various different impact events and stresses that stationary devices are not subjected to. As such, the invention is well suited for implementation of displays for handheld electronic device or a portable electronic device that are designed to be thin. 
     In one embodiment, the size of the glass cover depends on the size of the associated electronic device. For example, with handheld electronic devices, the glass cover is often not more than five (5) inches diagonal. As another example, for portable electronic devices, such as smaller portable computers or tablet computers, the glass cover is often between four (4) to twelve (12) inches diagonal. As still another example, for portable electronic devices, such as full size portable computers, displays or monitors, the glass cover is often between ten (10) to twenty (20) inches diagonal or even larger. 
     However, it should be appreciated that with larger screen sizes, the thickness of the glass layers may need to be greater. The thickness of the glass layers may need to be increased to maintain planarity of the larger glass layers. While the displays can still remain relatively thin, the minimum thickness can increase with increasing screen size. For example, the minimum thickness of the glass cover can correspond to about 0.4 mm for small handheld electronic devices, about 0.6 mm for smaller portable computers or tablet computers, about 1.0 mm or more for full size portable computers, displays or monitors, again depending on the size of the screen. The thickness of the glass cover depends on the application and/or the size of electronic device. While the current trend is to accommodate thinner and thinner devices, some examples for thicknesses of the glass cover can correspond to about 1 mm for small handheld electronic devices, about 2 mm for smaller portable computers or tablet computers, about 3 mm or more for full size portable computers, displays or monitors, again depending on the size of the screen. 
     Embodiments of the invention are discussed below with reference to  FIGS. 1A-11 . 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. 
       FIGS. 1A-1E  show views of one or more embodiments of a consumer electronic product. The electronic device  100  may, for example, be embodied as portable or handheld electronic device having a thin form factor (or low profile). The electronic device  100  can, for example, correspond to a media player, a media storage device, a Portable Digital Assistant (PDA), a tablet PCs, a computer, a cellular phone, a smart phone, a GPS unit, a remote control, and the like. 
       FIG. 1A  shows a perspective view of electronic device  100  according to one embodiment.  FIG. 1B  shows a detailed view of the electronic device  100 . The electronic device  100  may include a housing  102  that serves as part of an outer surface for the electronic device  100 . Electrical components (not shown in  FIGS. 1A and 1B ) may be disposed within the housing  102 . The electrical components may include, but are not limited to, a controller (or processor), memory, battery, display, camera, and illuminator such as a flash. 
     Additionally, glass may be used in covering front and/or back surfaces of the electronic device  100 . The electronic device  100  may have at least one cover glass  104 . The cover glass  104  may serve as an external surface, i.e., front or back surface, for the electronic device  100 . The cover glass  104  may also resist scratching and therefore may provide a substantially scratch-resistance surface for the front or back surface of the housing  102  for the electronic device  100 . The cover glass  104  may be coupled to the housing  102 , for example, using an adhesive. 
     The cover glass  104  may be provided over a camera area. The cover glass  104  may comprise a transparent camera window  106  at or adjacent the camera area. In one example, the camera area may comprise at least a camera such as a digital camera for capturing images or video. At or adjacent the camera area, the transparent camera window  106  of the cover glass  104  may be substantially transparent to the camera, for capturing images or video through the cover glass  104 . The camera area may extend within the housing  102  of the electronic device  100 . A minority region of cover glass  104  adjacent to the camera may extend over the camera area. The minority region of cover glass  104  adjacent to the camera may comprise the transparent camera window  106 . The cover glass  104 , and more particularly the transparent camera window  106  can substantially overlap the camera, In one embodiment, a peripheral region of the cover glass  104  (more particularly the transparent camera window  106 ) may be adjacent to the camera and may extend over the camera area. 
     Similarly, the cover glass  104  may be provided over an illuminator area. In one example, the illuminator area may comprise at least an illuminator such as a light emitting diode (LED) or electronic flash tube for illuminating dark scenes. At the illuminator area, the cover glass  106  may be substantially transparent to the illuminator and arranged so that illumination may project outwardly from the cover glass  104 . The illuminator area may be disposed within the housing  102  of the electronic device  100 . 
     Additionally, in some embodiments the cover glass  104  may be provided over a display area. In some embodiments the cover glass  104  may be substantially transparent so that the display area can be viewed through the cover glass  104 . In some embodiments, the display area may be disposed within the housing  102  of the electronic device  100 . In some embodiments, the electronic device  100  may include a full view or substantially full view display area that consumes a majority of the front surface of the electronic device  100 . The display area may be embodied in a variety of ways. In one example, the display area may comprise at least a display such as a flat panel display and more particularly an LCD display. 
     The display area may alternatively or additionally include a touch sensing device positioned over a display screen. For example, the display area may include one or more glass layers having capacitive sensing points distributed thereon. Each of these components may be separate layers or they may be integrated into one or more stacks. In one embodiment, the cover glass  104  may act as the outer most layer of the display area. 
     In some embodiments, the electronic device  100  may include a display region (e.g., the display area) that includes various layers. The various layers may include at least a display, and may additionally include a sensing arrangement disposed over the display. In some cases, the layers may be stacked and adjacent one another, and may even be laminated thereby forming a single unit. In other cases, at least some of the layers are spatially separated and not directly adjacent. 
     For example, the sensing arrangement may be disposed above the display such that there is a gap therebetween. By way of example, the display may include a Liquid Crystal Display (LCD) that includes a Liquid Crystal Module (LCM). The LCM generally includes at least an upper glass sheet and a lower glass sheet that at least partially sandwich a liquid crystal layer therebetween. The sensing arrangement may be a touch sensing arrangement such as those used to create a touch screen. 
     For example, a capacitive sensing touch screen may include substantially transparent sensing points or nodes dispersed about cover glass. The cover glass  104  may serve as an outer protective barrier for the display region. Typically, the cover glass  104  may be adjacent to the display region. However, the cover glass  104  may also be integrated with the display region, such as another layer (outer protective layer) for the display region. 
     The cover glass  104  may extend across the entire top surface of the housing  102 . In such a case, the edges of the cover glass  104  may be aligned, or substantially aligned, with the sides of the housing  102 . 
     Given that the thickness of the cover glass  104  may be rather thin (i.e., typically less than a few millimeters), the cover glass  104  if not carefully arranged can be susceptible to cracking or breaking if a significant force is imposed thereon, such as by a drop event where the electronic device  100  is accidentally dropped. 
     The glass material for the cover glass  104  can be selected from available glass that is stronger. For example, alumino silicate glass (e.g., DVTS from Corning) is one suitable choice for the glass material for the cover glass  104 . Other examples of glass materials include, but are not limited to including, sodalime, borosilicate, and the like. 
     Transparent camera window  106  can be integrated into the cover glass  104 . Transparent camera window  106  can likewise comprise glass. However, in some embodiments, transparent camera window can comprise plastic. 
     The edges of the cover glass pieces can be configured to correspond to a particular predetermined geometry. By machining the edges of the cover glass  104  to correspond to the particular predetermined geometry, the cover glass  104  can become stronger and thus less susceptible to damage. 
     Moreover, as will be discussed in greater detail subsequently herein, the cover glass  104  can be selectively chemically treated for further strengthening. One suitable chemical treatment is to selectively expose one or more surface portions of the cover glass in a chemical bath containing potassium (e.g., KNO3) for a period of time (e.g., several hours) at an elevated temperature. The selective chemical treatment can desirably result in higher compression stresses at the selectively exposed surface portions of the cover glass. The higher compression stresses may be the result ion exchange wherein K+ ions effectively replacing some Na+ ions at or near the selectively exposed surface portions of the cover glass  104 . 
     In addition to such selective strengthening, reducing veiling glare may improve quality of images or video captured by the camera through transparent camera window  106 . Optical features such as an optical barrier region  110  may be disposed in the cover glass  104 . The optical barrier region  110  may substantially reduce veiling glare, substantially inhibiting such diffuse stray light from reaching the image plane of the camera. Veiling glare might otherwise reduce contrast and resolution of images or video captured by the camera. 
     As shown in the figures (and as particularly shown in detailed view in  FIG. 1B ), the cover glass  104  can have a substantially smooth exterior surface comprising the transparent camera window  106  substantially encircled by the optical barrier perimeter  110 . The exterior surface of the cover glass  104  can be lapped to be planar over the transparent camera window  106 , the optical barrier perimeter  110  and the adjacent region  111  of the cover glass  104 . As discussed in greater detail subsequently herein the optical barrier perimeter  110  may comprise metal. 
     The camera can be arranged adjacent to the transparent camera window  106  and within the optical barrier perimeter  110 . The optical barrier perimeter  110  can be interposed within the cover glass  104  between the camera and an adjacent region  111  of the cover glass for reducing glare at the camera via the cover glass. More particularly, the optical barrier perimeter  110  can be interposed within the cover glass  104  between the transparent camera window  106  and an adjacent region  111  of the cover glass for reducing glare at the camera via the cover glass. As shown in the figures, the adjacent region  111  of the cover glass may comprise a majority region of the cover glass. 
     Similarly, the optical barrier perimeter  110  may be disposed within the cover glass  104  between the camera associated with transparent camera window  106  and the illuminator of the illuminator area. The optical barrier perimeter  110  may serve to substantially reduce light from the illuminator from coupling into the camera by way of the cover glass  104 . More specifically, the optical barrier perimeter  110  may serve to substantially reduce veiling glare from the illuminator from coupling into the camera by way of the cover glass  104 . 
     As shown in simplified cross sectional view in  FIG. 1C , the electronic device  100  may include housing  102  (shown greatly simplified in  FIG. 1C ). Electrical components  103  may be disposed within housing  102 . As mentioned previously herein the electrical components may include, but are not limited to, a controller (or processor), memory, battery, display, camera, and illuminator such as a flash. The cover glass  104  may be coupled to the housing  102 , for example, using adhesive  105 . For ease of illustration, in cross sectional views relative thickness of cover glass  104  is shown as greatly exaggerated. Similarly, for ease of illustration, layer thickness of optical barrier perimeter  110  is show as greatly exaggerated. The optical barrier perimeter  110  is highlighted in the figures using hatching. 
     As shown in cross sectional view in  FIG. 1C , the cover glass  104  can have a substantially smooth exterior surface comprising the transparent camera window  106  substantially encircled by optical barrier perimeter  110 . The optical barrier perimeter  110  can be interposed within the cover glass  104  between the transparent camera window  106  and adjacent region  111  of the cover glass, for reducing glare at the camera via the cover glass. The adjacent region  111  of the cover glass may comprise the majority region of the cover glass  104 . 
     In  FIG. 1D , a portion of the electronic device  100  is shown further simplified in cross sectional view, so as to illustrate operation of optical barrier perimeter  110  in reducing veiling glare at camera  107  of the electronics of device  100 . Veiling glare propagating in cover glass  104  is depicted in  FIG. 1D  by notional dashed line arrows. The optical barrier perimeter  110  may substantially reduce veiling glare, substantially inhibiting such diffuse stray light from reaching the image plane of the camera  107 . Accordingly, the optically barrier perimeter  110  is shown in  FIG. 1D  as blocking the notional dashed line arrows, so as to depict such substantial reduction in veiling glare. 
     As shown in  FIG. 1D  the camera  107  can be arranged adjacent to the transparent camera window  106  and within the optical barrier perimeter  110 . The optical barrier perimeter  110  can be interposed within the cover glass  104  between camera  107  and adjacent region  111  of the cover glass for reducing glare at the camera  107  via the cover glass  104 . More particularly, the optical barrier perimeter  110  can be interposed within the cover glass  104  between the transparent camera window  106  and an adjacent region  111  of the cover glass for reducing glare at the camera  107  via the cover glass  104 . As shown in  FIG. 1D , the adjacent region  111  of the cover glass  104  may comprise the majority region of the cover glass  104 . 
     In  FIG. 1E , a portion of the electronic device  100  is shown simplified in cross sectional view, so as to illustrate operation of optical barrier perimeter  110  in reducing veiling glare at camera  107  from illuminator  109  of the electronics of device  100 . Veiling glare propagating in cover glass  104  from illuminator  109  is depicted in  FIG. 1E  by notional dashed line arrows. The optical barrier perimeter  110  may substantially reduce veiling glare from illuminator  109 , substantially inhibiting such diffuse stray light of the illuminator from reaching the image plane of the camera  107 . Accordingly, the optical barrier perimeter  110  is shown in  FIG. 1E  as blocking the notional dashed line arrows, so as to depict such substantial reduction in veiling glare from illuminator  109 . 
     As shown in  FIG. 1E  the camera  107  can be being arranged adjacent to the transparent camera window  106  and within the optical barrier perimeter  110 . The optical barrier perimeter  110  can be interposed within the cover glass  104  between camera  107  and adjacent region  111  (or illuminator area of illuminator  109 ) for reducing glare at the camera  107  via the cover glass. More particularly, the optical barrier perimeter  110  can be interposed within the cover glass  104  between the transparent camera window  106  and an adjacent region  111  (or illuminator area of illuminator  109 ) for reducing glare at the camera via the cover glass  104 . 
       FIGS. 2A-5B  show cover glass processing according to one embodiment. 
       FIG. 2A  shows a perspective view of cover glass  204 , which may be singulated from sheet glass.  FIG. 2B  shows a detailed view of the peripheral region of cover glass  204 . 
       FIG. 3A  shows a perspective view of processed cover glass  304  after an aperture  312  has been formed in the cover glass  304 . The aperture  312  may be formed in various ways, for example by drilling.  FIG. 3B  shows a detailed view of the peripheral region of processed cover glass  304  with the aperture  312 . 
       FIG. 4A  shows a perspective view of a further processed cover glass  404  after an optical barrier perimeter  410  has been disposed in an aperture  412  formed in the cover glass  404 . Optical barrier perimeter  410  can be metal, which may be selected to have a relatively high melting temperature, for example tungsten or molybdenum. 
     Layer thickness of the optical barrier perimeter  410  may be relatively thin, for example on the order of approximately hundreds of nanometers, or on the order of approximately a micron or microns. Layer thickness of the optical barrier perimeter  410  may be selected depending on the material (e.g. metal) and based on effectiveness for reducing veiling glare. 
     Various ways may be used for disposing the optical barrier perimeter  410  in the aperture  412  formed in the cover glass  404 . For example, a process of Physical Vapor Deposition may be used. PVD allows for forming a thin layer of material (e.g., metal) in the aperture  412  which can serve as the optical barrier perimeter  410 . As shown in  FIG. 4A , the thin layer of material applied by a PVD process can be provided on the exposed sides within the aperture  412  of the cover glass. 
       FIG. 4B  shows a detailed view of the peripheral region of further the processed cover glass  404 . Optical barrier perimeter  410  is highlighted in  FIGS. 4A and 4B  using hatching. 
       FIG. 5A  shows a perspective view of a further processed cover glass  504  after a transparent camera window  514  has been disposed within optical barrier perimeter  510 , and within an aperture  506  extending through the cover glass  504 . The transparent camera window  514  can be formed as a suitably sized glass plug or peg, and can be hot pressed in place at a suitable temperature, for example approximately six hundred (600) to approximately seven hundred (700) degrees Celsius (° C.). 
     As particularly shown in detailed view in  FIG. 5B , the cover glass  504  can have a substantially smooth exterior surface comprising the transparent camera window  514  substantially encircled by the optical barrier perimeter  510 . The exterior surface (e.g., front or rear surface) of the cover glass  504  can be lapped to be planar over the transparent camera window  514 , the optical barrier perimeter  510  and the adjacent region  511  of the cover glass  504 . 
       FIGS. 6A-6D  are simplified cross sectional views illustrating cover glass processing according to one embodiment.  FIG. 6A  shows a cross sectional view of processed cover glass  604  after an aperture  612  has been formed in the cover glass  604 . As mentioned previously, the aperture  612  may be formed in various ways, for example by drilling. 
       FIG. 6B  shows a cross sectional view of the further processed cover glass  604  after an optical barrier perimeter  610  has been disposed in the aperture  612  formed in the cover glass  604 . As mentioned previously, the optical barrier perimeter  410  can be metal. The metal may be selected to have a relatively high melting temperature, for example tungsten or molybdenum. The optical barrier perimeter  610  is highlighted in the figures using hatching. 
       FIG. 6C  shows a cross sectional view of the further processed cover glass  604  after an elongated transparent camera window  606 A has been disposed within optical barrier perimeter  610  and within the aperture extending through cover glass  604 . The elongated transparent camera window  606 A can be formed as an elongated glass plug or peg, and can be hot pressed in place at a suitable temperature, for example approximately six hundred (600) to approximately seven hundred (700) degrees Celsius (° C.). As will be discussed next, the elongated transparent camera window  606 A can be lapped down, using a suitable abrasive slurry (e.g., comprising cesium oxide), so that the exterior surface of the cover glass can be planar. 
     For example, as shown in cross sectional view in  FIG. 6D , the cover glass  604  can have a substantially smooth exterior surface comprising the transparent camera window  606 B substantially encircled by the optical barrier perimeter  610 . The resulting exterior surface of the cover glass  604  can be planar over the transparent camera window  606 B, the optical barrier perimeter  610  and the adjacent region  611  of the cover glass  604 . 
       FIGS. 7A-7C  are simplified cross sectional views illustrating cover glass processing according to another embodiment.  FIG. 7A  shows a cross sectional view of a processed cover glass  704  after an aperture  712  has been formed in the cover glass  604 . As mentioned previously, the aperture  712  may be formed in various ways, for example by drilling. 
     Rather than disposing an optical barrier perimeter in the aperture  712  formed in the cover glass  604  as just discussed with respect to  FIG. 6B , in this alternative embodiment of  FIG. 7B  an optical barrier perimeter  710  is disposed as a coating onto an elongated transparent camera window  706 A.  FIG. 7B  shows a cross sectional view of the further processed cover glass  704  after the elongated transparent camera window  706 A (coated with the optical barrier perimeter  710 ) has been disposed within the aperture  712  extending through the cover glass  704 . The elongated transparent camera window  706 A can be formed as an elongated glass plug or peg, and can be hot pressed in place at a suitable temperature, for example approximately six hundred (600) to approximately seven hundred (700) degrees Celsius (® C.). As will be discussed next, the elongated transparent camera window  706 A (coated with the optical barrier perimeter  710 ) can be lapped down, using a suitable abrasive slurry (e.g., comprising cesium oxide), so that the exterior surface of the cover glass  704  can be planar. 
     For example, as shown in cross sectional view in  FIG. 7C , the cover glass  704  can have a substantially smooth exterior surface comprising the transparent camera window  706 B substantially encircled by the optical barrier perimeter  710 . The resulting exterior surface of the cover glass  704  can be planar over the transparent camera window  706 B, the optical barrier perimeter  710  and adjacent region  711  of the cover glass  704 . 
       FIGS. 8A-8C  are simplified cross sectional views illustrating cover glass processing according to another embodiment.  FIG. 8A  shows a cross sectional view of a processed cover glass  804  after an aperture  812  has been formed in the cover glass  804 . In the embodiment shown in  FIG. 8A , the glass of the cover glass  805  can be dark or opaque, as representatively illustrated by right to left hatching. 
       FIG. 8B  shows a cross sectional view of the dark or opaque cover glass  804  after an elongated transparent camera window  806 A has been disposed within the aperture  812  extending through the dark or opaque cover glass  804 . The elongated transparent camera window  806 A can be formed as an elongated glass plug or peg, and can be hot pressed in place at a suitable temperature, for example approximately six hundred (600) to approximately seven hundred (700) degrees Celsius (° C.). As will be discussed next, the elongated transparent camera window  806 A can be lapped down, using a suitable abrasive slurry (e.g., comprising cesium oxide), so that the exterior surface of the dark opaque cover glass can be planar. 
     For example, as shown in cross sectional view in  FIG. 8C , the dark or opaque cover glass  804  can have a substantially smooth exterior surface comprising the transparent camera window  806 B. The resulting exterior surface of the dark or opaque cover glass  804  can be planar over the transparent camera window  806 B and adjacent region  811  of the dark or opaque cover glass  804 . 
       FIG. 8D  is a simplified view of another embodiment of a consumer electronic product  800 . The consumer electronic product  800  can comprise a housing and electrical components disposed at least partially internal to the housing. The electrical components can including at least a camera  807 . 
     The consumer electronic product  800  can include the cover glass  804  coupled to the housing. The cover glass  804  can include the transparent camera window  806 B and an adjacent glass region  811  that is dark or opaque. The camera  807  can be arranged adjacent to the transparent camera window  806 B. The adjacent glass region  811  can be sufficiently dark or opaque for substantially reducing glare at the camera  807  via the cover glass  804 . 
     The cover glass  804  can have a substantially smooth exterior surface extending over the transparent camera window  806 B and the adjacent glass region  811 . The cover glass  804  can have an exterior surface that is lapped to be planar over the transparent camera window  806 B and the adjacent glass region  811 . 
       FIG. 9  is a diagram showing a detailed partial cross sectional view of chemical strengthening of exposed surface portions of cover glass.  FIG. 9  diagrammatically illustrates a chemical treatment process of submerging the cover glass  904  in a heated potassium bath  916  (for example a molten KNO3 bath), for chemically strengthening the cover glass  904 . When the cover glass  904  is submerged or soaked in the heated potassium bath  916 , diffusion and ion exchange can occur at exposed surface portions of the cover glass  904 . 
     As shown in  FIG. 9 , Na +  ions  915  which are present in cover glass  904  can diffuse into potassium bath  916 , while K +  ions  917  in potassium bath  916  can diffuse into cover glass  904  such that a compressive surface layer  919  can be formed. In other words, K +  ions  917  from potassium bath  916  can be exchanged with Na +  ions  915  to form compressive surface layer  919 . The K +  ions  917  can provide a compressive stress surface stress (CS) of the compressive surface layer  919 , which chemically strengthens the compressive surface layer  919  of the cover glass  904 . Compressive surface layer  919  is highlighted using cross hatching. 
     Cover glass  904  is shown in  FIG. 9  as having a thickness (t). By controlling chemical treatment parameters such as the length of time of chemical strengthening treatment and/or the concentration of K +  ions  917  in potassium bath  916 , a depth (d) of compressive surface layer  919  and compressive stress surface stress (CS) of the compressive surface layer  919  may be substantially controlled. In some cases, K +  ions  917  may not diffuse into a center portion  921  of the cover glass  904 . In  FIG. 9 , the center portion  921  is shown without cross hatching. The central portion  921  of the cover glass  904  can have a central tension (CT) in response to the compressive stress surface stress (CS) of the compressive surface layer  919 . 
       FIGS. 10A and 10B  are simplified cross sectional views illustrating chemical strengthening of a cover glass  1004  according to one embodiment.  FIG. 10A  shows the cover glass  1004  prior to any chemical strengthening.  FIG. 10B  shows the cover glass  1004  after chemical strengthening. 
     As shown in  FIGS. 10A and 10B , the cover glass  1004  can have a substantially smooth exterior surface comprising transparent camera window  1006  substantially encircled by an optical barrier perimeter  1010 . The exterior surface of the cover glass  1004  can be lapped, for example prior to chemical strengthening, to be planar over the transparent camera window  1006 , the optical barrier perimeter  1010  and an adjacent region of the cover glass  1004 . 
     After chemical strengthening,  FIG. 10B  shows a chemically strengthened surface  1019 A of the glass camera window  1006 .  FIG. 10B  also shows a chemically strengthened surface  1019 B of the adjacent region  1011  of the cover glass  1004 . 
       FIG. 10C  is a simplified view of another embodiment of a consumer electronic product  1000  comprising a housing and electrical components disposed at least partially internal to the housing, wherein the electrical components include at least a camera  1007 . The cover glass  1004  can be coupled to the housing. 
     The cover glass  1004  can comprise the glass camera window  1006  having the chemically strengthened surface  1019 A. The cover glass  1004  can comprise the adjacent region  1011  having chemically strengthened surface  1019 B. The cover glass  1004  can further comprise the optical barrier perimeter  1010 . The optical barrier perimeter  1010  can substantially encircle the glass camera window  1006 . The optical barrier perimeter  1010  can comprise metal. 
     The camera  1007  can be arranged adjacent to the glass camera window  1006 . The optical barrier perimeter  1010  can be interposed within the cover glass  1004  between the camera  1007  and the adjacent region  1011  of the cover glass for reducing glare at the camera  1007  via the cover glass. More particularly, the optical barrier perimeter  1010  can be interposed within the cover glass  1004  between the glass camera window  1006  and the adjacent region  1011  of the cover glass  1004  and can serve to reduce glare at the camera  1007  via the cover glass  1004 . 
     In  FIG. 10C , the electronic device  1000  is shown simplified in cross sectional view, so as to illustrate operation of the optical barrier perimeter  1010  in reducing veiling glare at the camera  1007  of the electronics of device  1000 . Veiling glare propagating in the cover glass  1004  is depicted in  FIG. 10C  by notional dashed line arrows. The optical barrier perimeter  1010  may substantially reduce veiling glare, substantially inhibiting such diffuse stray light from reaching the image plane of the camera  1007 . Accordingly, the optically barrier perimeter  1010  is shown in  FIG. 10C  as blocking the notional dashed line arrows, so as to depict such substantial reduction in veiling glare. 
     For the consumer electronic product  1000  shown in  FIG. 10C , the cover glass  1004  can have a substantially smooth exterior surface extending over the glass camera window  1006 , the optical barrier perimeter  1010  and the adjacent region  1011  of the cover glass  1004 . The cover glass  1004  can have an exterior surface that is planar (e.g., by lapping) over the glass camera window  1006 , the optical barrier  1010  and the adjacent region  1011  of the cover glass  1004 . 
       FIG. 11  is a flow diagram illustrating an assembly process  1100  according to one embodiment. The assembly process  1100  may begin by forming  1102  an aperture in a cover glass. The process  1100  may continue by interposing  1104  an optical barrier perimeter which substantially encircles a camera window. The optical barrier perimeter provided between the camera window and an adjacent glass region. 
     The process  1100  may continue by disposing  1106  the transparent camera window in the aperture of the cover glass. For a tight fit, the transparent camera window can be heated (i.e., becomes compliant) and pressed into place within the aperture. The process  1100  may continue with lapping  1108  the transparent camera window such that the transparent camera window and an adjacent glass region of the cover glass yield a planar exterior surface of the cover glass. 
     The process  1100  may continue with disposing  1110  the transparent camera window adjacent to a camera. The process  1100  may continue with subsequently attaching  1112  the cover glass to a housing for the electronic product. Once the cover glass has been attached to the housing, the assembly process  1100  can end. 
     This application references U.S. patent application Ser. No. 12/847,926 filed Jul. 30, 2010, and entitled “Electronic Device Having Selectively Strengthening Glass Cover Glass”, which is hereby incorporated herein by reference. 
     Embodiments of the invention are well suited for portable, battery-powered electronic devices, and more particularly handheld battery-powered electronic devices. Examples of portable, battery-powered electronic devices can include laptops, tablet computers, media players, phones, GPS units, remote controls, personal digital assistant (PDAs), and the like. 
     The various aspects, features, embodiments or implementations of the invention described above can be used alone or in various combinations. 
     The advantages of the invention are numerous. Different aspects, embodiments or implementations may (but need not) yield one or more of the following advantages. One advantage of the invention is that cover glass can be strengthened, even at a camera window region, to protect from damage that would otherwise result from a drop event. Another advantage is efficiency and/or pleasing appearance in integrating a transparent camera window into the cover glass. Another advantage is improved image or video quality, which may result from substantially reducing veiling glare. 
     The many features and advantages of the invention are apparent from the written description and, thus, it is intended by the appended claims to cover all such features and advantages of the invention. 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: 20140227
Publication Date: 20180710
Grant Date: 20180710
Priority Date: 20120110
Inventors: Weber, Douglas J.
Assignee: APPLE INC
CPC Classifications: [{"code": "H04N23/56", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0264", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04N5/2256", "inventive": true, "first": false, "tree": "[]"}, {"code": "Y10T29/49002", "inventive": false, "first": false, "tree": "[]"}, {"code": "G02B27/0018", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B5/003", "inventive": true, "first": false, "tree": "[]"}, {"code": "G03B11/045", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": true, "tree": "[]"}, {"code": "Y10T29/49002", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04M1/0264", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/1628", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F1/1626", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02F1/133502", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B27/0018", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B5/02", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B5/003", "inventive": true, "first": false, "tree": "[]"}, {"code": "Y10T29/49002", "inventive": false, "first": false, "tree": "[]"}, {"code": "G03B11/045", "inventive": true, "first": true, "tree": "[]"}, {"code": "G02B27/0018", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B5/003", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/0264", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 47522977