PATENT DOCUMENT

Publication Number: US-11150695-B1
Application Number: US-201916509560-A
Country: US
Kind Code: B1

Title: Head mounted device

Abstract:
A head mounted device includes a housing that defines an interior space and an elongate member that is connected to the housing and is configured to expand and contract to conform to the head of a user. The elongate member includes at least one end portion that is connected to the housing at an attachment point. The attachment point is located in the interior space of the housing such that the end portion of the elongate member extends along a path within the housing that has a length that is greater than half of a lateral width of the housing.

Claims:
What is claimed is: 
     
       1. A head mounted device, comprising:
 a housing that defines an interior space; and 
 an elongate member connected to the housing that is configured to expand and contract to conform to the head of a user, the elongate member including:
 at least one end portion that is connected to the housing at an attachment point that is located in the interior space of the housing such that the end portion of the elongate member extends along a path within the housing that has a length that is greater than half of a lateral width of the housing. 
 
 
     
     
       2. The head mounted device of  claim 1 , further comprising:
 an opening located at a first lateral side of the housing, 
 wherein the interior space of the housing defines a passage that extends from the opening to the attachment point, wherein the attachment point is located near a second lateral side of the housing opposite the first lateral side of the housing. 
 
     
     
       3. The head mounted device of  claim 1 , further comprising:
 an opening located at a first lateral side of the housing, 
 wherein the interior space of the housing defines a passage that extends from the opening to the attachment point, wherein the attachment point is located near the first lateral side of the housing. 
 
     
     
       4. The head mounted device of  claim 1 , wherein the end portion is connected to the housing at the attachment point by a spring. 
     
     
       5. The head mounted device of  claim 1 , wherein the elongate member includes:
 a first end portion that is connected to the housing at a first attachment point that is located in the interior space of the housing such that the first end portion of the elongate member extends along a first path within the housing that has a length that is greater than half of a lateral width of the housing; and 
 a second end portion that is connected to the housing at a second attachment point that is located in the interior space of the housing such that the second end portion of the elongate member extends along a second path within the housing that has a second length that is greater than half of the lateral width of the housing. 
 
     
     
       6. The head mounted device of  claim 5 , wherein:
 a first opening is located at a first lateral side of the housing; 
 a second opening is located at a second lateral side of the housing; 
 the interior space of the housing defines a passage that extends from the first opening to the second opening; 
 the first attachment point is located near the second opening; and 
 the second attachment point is located near the first opening. 
 
     
     
       7. The head mounted device of  claim 5 , wherein:
 a first opening is located at a first lateral side of the housing; 
 a second opening is located at a second lateral side of the housing; 
 the interior space of the housing defines a first serpentine passage that extends from the first opening to the first attachment point; and 
 the interior space of the housing defines a second serpentine passage that extends from the first opening to the second attachment point. 
 
     
     
       8. The head mounted device of  claim 5 , wherein:
 a first opening is located at a first lateral side of the housing; 
 a second opening is located at a second lateral side of the housing; 
 the interior space of the housing defines a first passage that extends from the first opening to the first attachment point and a second passage that extends from the second opening to the second attachment point; 
 the first attachment point is located near the second opening; and 
 the second attachment point is located near the first opening. 
 
     
     
       9. The head mounted device of  claim 5 , wherein:
 a first opening is located at a first lateral side of the housing; 
 a second opening is located at a second lateral side of the housing; 
 the interior space of the housing defines a first passage that extends from the first opening to the first attachment point and a second passage that extends from the second opening to the second attachment point; 
 the first attachment point is located near the first opening; and 
 the second attachment point is located near the second opening. 
 
     
     
       10. The head mounted device of  claim 5 , wherein:
 the first end portion is connected to the housing at the first attachment point by a first spring; and 
 the second end portion is connected to the housing at the second attachment point by a second spring. 
 
     
     
       11. The head mounted device of  claim 5 , wherein the elongate member includes a strap portion, the first end portion is defined by a first cord that extends from the strap portion to the first attachment point, and the second end portion is defined by a second cord that extends from the strap portion to the second attachment point. 
     
     
       12. The head mounted device of  claim 11 , wherein the first cord and the second cord are configured to expand and contract to adjust the length of the elongate member and the strap portion is configured to retain the head of the user. 
     
     
       13. The head mounted device of  claim 1 , further comprising:
 lenses coupled to the housing, 
 wherein:
 the elongate member includes a lens cover having at least one connector configured to removably connect to the housing; and 
 the lens cover is moveable relative to the housing between a connected position and a disconnected position. 
 
 
     
     
       14. The head mounted device of  claim 13 , wherein the lens cover is configured to contact a back portion of the head of the user in the disconnected position. 
     
     
       15. The head mounted device of  claim 1 , further comprising:
 an elongate member control mechanism coupled to the interior space of the housing, 
 wherein the elongate member control mechanism is operable to extend and retract the elongate member; and 
 an elongate member retaining mechanism that is located in the housing and is operable to engage the elongate member to restrain extension and retraction of the elongate member. 
 
     
     
       16. The head mounted device of  claim 15 , wherein the elongate member retaining mechanism includes:
 a clamp through which the elongate member extends; and 
 an actuator coupled to the clamp, wherein the actuator selectively closes the clamp to retain the elongate member. 
 
     
     
       17. The head mounted device of  claim 15 , wherein the elongate member control mechanism includes a spring-loaded spool, the spring-loaded spool being configured to apply axial tension to the elongate member to retract at least a portion of the elongate member into the interior space of the housing. 
     
     
       18. The head mounted device of  claim 15 , wherein the elongate member control mechanism includes a motorized spool, and wherein the motorized spool is configured to selectively extend and retract the elongate member. 
     
     
       19. The head mounted device of  claim 18 , further comprising:
 a sensor adapted to detect a user identity, the sensor coupled to the head mounted device; and 
 a controller coupled to the housing and in electrical communication with the sensor, the motorized spool and the elongate member retaining mechanism, 
 wherein the controller is operable to:
 receive a signal from the sensor indicative of the user identity; and 
 select a user identity profile corresponding to the user identity, the user identity profile including an operative length of the elongate member, 
 wherein in response to selecting the user identity profile, the controller uses the motorized spool to adjust the operative length of the elongate member according to the user identity profile and engages the elongate member retaining mechanism. 
 
 
     
     
       20. The head mounted device of  claim 18 , further comprising a controller coupled to the housing and in electrical communication with the motorized spool, the controller operable to:
 receive a signal indicative of content; and 
 in response to receiving the signal indicative of content, use the motorized spool to adjust an operative length of the elongate member and engage the elongate member retaining mechanism. 
 
     
     
       21. The head mounted device of  claim 20 , further comprising:
 a pressure sensor in electrical communication with the controller, the pressure sensor adapted to measure pressure between the head mounted device and the head of the user, 
 wherein content is associated with a pressure value, and 
 wherein the controller causes the motorized spool to extend or retract the elongate member in response to receiving a signal from the pressure sensor.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 62/729,551 filed on Sep. 11, 2018, the contents of which is hereby incorporated by reference herein in its entirety for all purposes. 
    
    
     TECHNICAL FIELD 
     This disclosure relates generally to head mounted devices that are configured to display content to a user. 
     BACKGROUND 
     Virtual reality systems, augmented reality systems, and mixed reality systems often include a head mounted device that displays content to a user. The head mounted device may include a housing that is worn on the user&#39;s head and is supported by a flexible support or a rigid support. Head mounted devices of this type typically require some manner of adjustment to fit the user&#39;s head. Incorrect size adjustments can result in user discomfort and instability of the device relative to the user&#39;s head. Manual adjustment may also be time consuming and inconvenient. 
     SUMMARY 
     One aspect of the disclosure is a head mounted device that includes a housing that defines an interior space and an elongate member that is connected to the housing and is configured to expand and contract to conform to the head of a user. The elongate member includes at least one end portion that is connected to the housing at an attachment point. The attachment point is located in the interior space of the housing such that the end portion of the elongate member extends along a path within the housing that has a length that is greater than half of a lateral width of the housing. 
     Another aspect of the disclosure is a head mounted device that includes a housing that defines an interior space and an elongate member control mechanism that is coupled to the interior space of the housing. The head mounted device may include an elongate member that is coupled to the elongate member control mechanism and is configured to extend circumferentially around the head of a user, where the elongate member control mechanism is operable to extend and retract the elongate member. The head mounted device may include an elongate member retaining mechanism that is located in the housing and is operable to engage the elongate member to restrain extension and retraction of the elongate member. 
     Another aspect of the disclosure is a head mounted device that includes a housing that defines an interior space and an elongate member control mechanism that is coupled to the interior space of the housing. The head mounted device may include an elongate member that is coupled to the elongate member control mechanism and configured to extend circumferentially around the head of a user, where the elongate member control mechanism is operable to extend and retract the elongate member. The head mounted device may include lenses coupled to the housing. The elongate member may include a lens cover having at least one connector configured to removably connect to the housing. The lens cover is moveable relative to the housing between a connected position and a disconnected position. 
     Another aspect of the disclosure is a head mounted device that includes a housing and a first elongate member that is connected to the housing and is configured to extend around a first portion of the head of a user. The head mounted device may include a first magnetic connector that is connected to the first elongate member, and the head mounted device may include a second magnetic connector. The first magnetic connector and the second magnetic connector are movable between a connected position, in which the first elongate member is configured to secure the housing with respect to the head of a user, and a disconnected position, in which the first elongate member is configured to release the housing with respect to the head of the user. 
     Another aspect of the disclosure is a method for correcting orientation of a head mounted device. The method includes detecting motion of a display enclosure using a first motion sensing device, detecting motion of an elongate member using a second motion sensing device, determining whether a position of the display enclosure changes relative to the elongate member based on the detected motion of the display enclosure and the detected motion of the elongate member, and, in response to a determination that a position of the display enclosure has changed relative to the elongate member, applying a correction to the display enclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of a head mounted device according to a first example. 
         FIG. 2  is a block diagram of components that can be included in the head mounted device according to the first example. 
         FIG. 3  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a second example. 
         FIG. 4  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a third example. 
         FIG. 5  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a fourth example. 
         FIG. 6  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a fifth example. 
         FIG. 7  is a front cross-sectional view taken along line B-B of  FIG. 1  of a head mounted device according to a sixth example. 
         FIG. 8  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a seventh example. 
         FIG. 9  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to an eighth example in a retracted position. 
         FIG. 10  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device according to the eighth example in an extended position. 
         FIG. 11  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a ninth example in a retracted position. 
         FIG. 12  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device according to the ninth example in an extended position. 
         FIG. 13  is a side view of a head mounted device according to a tenth example in a retracted position. 
         FIG. 14  is a side view of the head mounted device according to the tenth example in an extended position. 
         FIG. 15  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to an eleventh example in a retracted position. 
         FIG. 16  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device according to the eleventh example in an extended position. 
         FIG. 17  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a twelfth example. 
         FIG. 18  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a thirteenth example. 
         FIG. 19  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a fourteenth example. 
         FIG. 20  is a side view of an elongate member retaining mechanism in an open position. 
         FIG. 21  is a side view of the elongate member retaining mechanism of  FIG. 20  in a closed position. 
         FIG. 22  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a fifteenth example. 
         FIG. 23  is a perspective view of a head mounted device according to a sixteenth example in a connected position. 
         FIG. 24  is a perspective view of the head mounted device according to the sixteenth example in a disconnected position. 
         FIG. 25  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to a seventeenth example in a retracted position. 
         FIG. 26  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device according to the seventeenth example in an extended position. 
         FIG. 27  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device according to an eighteenth example in a retracted position. 
         FIG. 28  is a top cross-sectional view taken along line A-A of FIG. of the head mounted device according to the eighteenth example in an extended position. 
         FIG. 29  is a side view of a head mounted device according to a nineteenth example in a first position. 
         FIG. 30  is a side view of the head mounted device according to the nineteenth example in a second position. 
         FIG. 31  is a flowchart showing a method for correcting an orientation of the head mounted device according to the nineteenth example. 
     
    
    
     DETAILED DESCRIPTION 
     The devices and methods herein allow for simplified adjustment of a head mounted device that includes a housing and an elongate member disposed around the head of a user. By disposing a portion of the elongate member in an interior space of the housing and connecting the elongate member to the housing using elastic, sprung, electrical, and/or mechanical elements, the elongate member can be extended out of the housing and around the head of the user such that the elongate member automatically adjusts to the size of the user&#39;s head. As a result, adjustment of the head mounted device is simplified, the length of time required to begin using the device is shortened, user comfort is increased, the stability of the head mounted device relative to the user&#39;s head is improved, and an ideal fit can be achieved for all users regardless of variations in user head size. 
       FIG. 1  is a side view of a head mounted device  100  worn by a user. The head mounted device  100  may be worn on the head  102  of the user and may allow the user to view images or other content using a display. The content may be part of an immersive experience in which the content appears to replace, supplement, or change the environment around the user. In the examples that are shown and described herein, the head mounted device  100  is configured to display virtual reality content to the user. For example, the head mounted device  100  may be configured to display the virtual reality content to the user in correspondence with tracked motion of the head  102  of the user, and such that the virtual reality content is displayed to the user to the exclusion of the environment around the user. The configurations described herein can be utilized with head mounted devices that are configured to display other types of content such as augmented reality content and mixed reality content. 
     In the illustrated example, the head mounted device  100  includes a housing  104  and an elongate member  106  (e.g., a headband). The housing  104  provides a structure to which other components of the head mounted device  100  may connect. The housing  104  may be shaped so as to be worn on the user&#39;s head  102  and/or face and may be selectively positioned to be near the user&#39;s eyes. The housing  104  is removably, permanently, or semi permanently connected to at least a portion of the elongate member  106 , which may be referred to as a strap or headband. 
     The elongate member  106  supports, positions, and/or secures the housing  104  to the user&#39;s head  102 . The elongate member  106  may be adjusted between an extended position in which the elongate member  106  may be extended around the head  102  of the user and a retracted position. As an example, the elongate member  106  may be in the extended position when the head mounted device  100  is being used, and the elongate member  106  may be in the retracted position when the head mounted device  100  is not being used. 
     As shown in  FIG. 1 , the elongate member  106  supports the head mounted device  100  relative to the head  102  of the user in a goggles-style configuration in which the elongate member  106  is connected to the lateral sides of the housing  104  and extends around the head  102  of the user. In alternative implementations, the head mounted device  100  may be supported with respect to the user&#39;s head  102  using a halo-style configuration in which a support plate contacts the user&#39;s forehead and the elongate member  106  secures the support plate to the head  102  of the user, or using any other suitable configuration. 
     In the examples described herein, the elongate member  106  may be or include a strap or headband formed from an elastic material, such as nylon or another suitable material. In the examples described herein, the elongate member  106  may be or include a cord formed from an elastic material, such as nylon or another suitable material. In some implementations, the elongate member  106  includes both strap portions and cord portions. In some implementations, other types of structures are included in the elongate member  106 . In some implementations, the elongate member  106  may include inelastic structures in addition to elastic structures. 
       FIG. 2  is a block diagram of components that can be included in the head mounted device  100 . The head mounted device  100  may include features similar to those of the head mounted device  100 . The head mounted device  100  may include components connected to or retained in the housing  104 . Such components may include, but are not limited to, optics  208 , sensors  210 , a controller  212  including a memory and a processor, storage  214 , an interface  216 , an input device  218 , a display  220 , and a power source  222 . The components connected to or retained in the housing  104  may be connected to an external device that is removably connected to the housing  104 . 
     The optics  208  may guide light that is emitted by the display  220  to the user&#39;s eyes to allow content to be presented to the user. The optics  208  may include lenses or other suitable components. 
     The sensors  210  may be located in the housing  104  or may be otherwise incorporated into the head mounted device  100 . The sensors  210  are adapted to output signals that represent or are indicative of a sensed condition. The sensors  210  may include visible spectrum cameras; infrared spectrum cameras; structured-light stereo devices; depth cameras; an inertial measuring unit including accelerometers, gyroscopes, and magnetometers; lidar devices; radar devices; ultrasonic devices; infrared detectors; infrared beacons that emit signals that can be measured by external infrared detectors; capacitance sensors; biometric sensors; temperature sensors; light sensors; pressure sensors; force sensors; or any other type of sensor. The signals that are generated by the sensors  210  may be used during generation of the content that is presented to the user, such as by determining a head-tracking angle using the sensors  210  and generating content dependent on the head-tracking angle. 
     The controller  212  may include a processor and a memory. The controller  212  may be located in the housing  104  or may be otherwise incorporated into the head mounted device  100 . The controller  212  may be in electrical communication with any described component. The processor is operable to execute machine-readable instructions that may be stored in the memory or the storage  214 . The processor may be a central processing unit or any other conventional device. The memory may be a random-access memory module or any other high-speed, volatile, short-term information storage device. The storage  214  may include a solid-state drive, hard drive, or any other non-volatile information storage device. 
     The interface  216  allows the head mounted device  100  to communicate with external devices. The interface  216  may include a wired connection or a wireless connection that is implemented using any suitable communications protocol. 
     The input device  218  may include manual buttons, switches, analog sticks, directional pads, or the like; a handheld motion-tracked controller; a touchscreen input device; a gestural input device; or an audio input device such as a microphone. 
     The display  220  is operable to output images including still images and video images. The display  220  may include an LED screen, an LCD screen, or an OLED screen. The display  220  may be integral with the housing  104  or may be included in an external device that is removably connected to the housing  104 . 
     The power source  222  supplies electrical power to the head mounted device  100 . The power source  222  may include a battery, such as a rechargeable battery or a non-rechargeable battery of any suitable type. 
     The general configuration of the head mounted device  100 , as described with respect to  FIGS. 1-2 , is generally applicable to head mounted devices according to second through nineteenth examples that will be described herein and is hereby incorporated by reference in the descriptions of those devices. 
       FIG. 3  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  300  according to a second example. The head mounted device  300  may include features similar to those of the head mounted device  100  except as otherwise described. In the illustrated example, the head mounted device  300  includes a housing  304  and an elongate member  306 . The elongate member  306  is connected to the housing  304  such that it is movable with respect to the housing  304  between a retracted position, in which at least a portion of the elongate member  306  is stored within the housing  304 , and an extended position. As an example, twenty-five percent or more of the elongate member  306  may be stored in the housing  304  in the retracted position. 
     The housing  304  has an interior space  324  that defines a passage  326 . As used herein, the term “passage” refers to a partially or fully enclosed area within the housing  304  through which the elongate member  306  may pass. The passage  326  extends from a first opening  328  at a first lateral side  330  of the housing  304  to a second opening  332  at a second lateral side  334  of the housing  304 . In the illustrated example, the passage  326  extends laterally across the housing  304  from the first lateral side  330  to the second lateral side  334  and is generally straight. The passage  326  may, however, be configured differently. As examples, the passage  326  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. While the interior space  324  in the illustrated example defines a passage, it may additionally or alternatively define an opening, recess, cavity, depression, enclosure, and/or other interior space. 
     The elongate member  306  is a flexible, elastic structure, such as a strap, a cord, a strap and cord in combination, or any other suitable flexible, elastic structure. The elongate member  306  includes a first end portion  336  and a second end portion  342 . Although the elongate member  306  is flexible and elastic, components and structures incorporated in or attached to the elongate member  306  may be inflexible and/or inelastic. 
     The first end portion  336  is a part of the elongate member  306  that is located inside the housing  304 , inclusive of the location at which the elongate member  306  terminates. The first end portion  336  is connected to the housing  304  at a first attachment point  338 . The first end portion  336  extends along a first path  340  through the passage  326  from the first attachment point  338  to the first opening  328 . As used herein, the term “first path” is defined as the path along which a first part of the elongate member  306  extends, such as from the first attachment point  338  to the first opening  328  in this example. The first attachment point  338  is located in the interior space  324  at a position that is near the second lateral side  334 . The first end portion  336  may be connected to the housing  304  at the first attachment point  338  using any type of adhesive, magnets, stitching, hook-and-loop fasteners, welding, rivets, interference fit, snaps, fastener, or any other type of attachment. 
     To allow storage of part of the elongate member  306  in the housing  304  in the retracted position, the first path  340  has a length that is greater than half of a lateral width of the housing  304 . In some implementations, the first path  340  may extend along any lateral width of the housing  304 . 
     The second end portion  342  is located at an opposite end of the elongate member  306  relative to the first end portion  336 . The second end portion  342  may or may not be the same length as the first end portion  336 . 
     The second end portion  342  is a part of the elongate member  306  that is located inside the housing  304 , inclusive of the location at which the elongate member  306  terminates. The second end portion  342  is connected to the housing  304  at a second attachment point  344 . The second end portion  342  extends along a second path  346  through the passage  326  from the second attachment point  344  to the second opening  332 . As used herein, the term “second path” is defined as the path along which a second part of the elongate member  306  extends, such as from the second attachment point  344  to the second opening  332  in this example. The second attachment point  344  is located in the interior space  324  at a position that is near the first lateral side  330 . The second end portion  342  may be connected to the housing  304  at the second attachment point  344  using any type of adhesive, magnets, stitching, hook-and-loop fasteners, welding, rivets, interference fit, snaps, fastener, or any other type of attachment. 
     To allow storage of part of the elongate member  306  in the housing  304  in the retracted position, the second path  346  has a length that is greater than half of a lateral width of the housing  304 . In some implementations, the second path  346  may extend along any lateral width of the housing  304 . 
     The length of the first end portion  336  and the second end portion  342  inside the interior space  324  may change when the elongate member  306  is adjusted between the retracted position and the extended position, as a result of elastic expansion and contraction of the elongate member  306 . The elongate member  306  may be adjusted to the extended position when the elongate member  306  is disposed around the head of the user. In the extended position, part of the first end portion  336  and/or part of the second end portion  342  elastically extend from inside the interior space  324  to an exterior of the housing  304 . The elongate member  306  may return to the retracted position if the elongate member  306  is removed from the head of the user. In the retracted position, part of the first end portion  336  and part of the second end portion  342  elastically retract into the interior space  324 . More of the elongate member  306  may be stored in the interior space  324  in the retracted position than in the extended position. As a result of the storage of portions of the elongate member  306  in the housing  304 , the effective working length (i.e., length that is available to expand and contract) of the elongate member  306  is greater than the length that is disposed outside of the housing  304  in the retracted position. This allows a smaller minimum head size to be accommodated by the elongate member  306 , while still allowing expansion for large head sizes as a part of the elongate member  306  that is inside the housing  304  lengthens elastically and exits the housing  304  during movement toward the expanded position (i.e., that position at which a maximum head size is accommodated by the elongate member  306 ). 
       FIG. 4  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  400  according to a third example. The head mounted device  400  may include features similar to those of the head mounted device  300  except as otherwise described. In the illustrated example, the head mounted device  400  includes a housing  404  and an elongate member  406 . 
     The housing  404  has an interior space  424  that defines a first passage  448  and a second passage  450 . The first passage  448  extends laterally across the housing  404  from a first opening  428  to a first attachment point  438  that is located in the first passage  448  at a position that is near a second lateral side  434  of the housing  404 . The second passage  450  extends laterally from a second opening  432  to a second attachment point  444  that is located in the second passage  450  at a position that is near a first lateral side  430  of the housing  404 . The first passage  448  and the second passage  450  shown in the illustrated example are generally straight. The first passage  448  and the second passage  450  may, however, be configured differently. As examples, the first passage  448  and the second passage  450  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. The first passage  448  and the second passage  450  may or may not be the same shape. 
     In the illustrated example, a first end portion  436  of the elongate member  406  extends from the first attachment point  438 , along a first path  440  through the first passage  448 , and to the first opening  428 . A second end portion  442  extends from the second attachment point  444 , along a second path  446  through the second passage  450 , and to the second opening  432 . 
       FIG. 5  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  500  according to a fourth example. The head mounted device  500  may include features similar to those of the head mounted device  400  except as otherwise described. In the illustrated example, the head mounted device  500  includes a housing  504  and an elongate member  506 . The housing  504  has an interior space  524  that defines a first passage  548  and a second passage  550 . The first passage  548  extends in a U-shape from a first opening  528  to a first attachment point  538 . The first attachment point  538  is located in the first passage  548  at a position that is near a first lateral side  530  of the housing  504 . The second passage  550  extends in a U-shape from a second opening  532  to a second attachment point  544 . The second attachment point  544  is located in the second passage  550  at a position that is near a second lateral side  534  of the housing  504 . The first passage  548  and the second passage  550  are generally U-shaped. The first passage  548  and the second passage  550  may, however, be configured differently. As examples, the first passage  548  and the second passage  550  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. The first passage  548  and the second passage  550  may or may not be the same shape and may include any number of bends, curves, or turns. 
     In the illustrated example, a first end portion  536  of the elongate member  506  extends from the first attachment point  538 , along a first path  540  through the first passage  548 , and to the first opening  528 . A second end portion  542  extends from the second attachment point  544 , along a second path  546  through the second passage  550 , and to the second opening  532 . 
       FIG. 6  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  600  according to a fifth example. The head mounted device  600  may include features similar to those of the head mounted device  500  except as otherwise described. 
     In the illustrated example, the head mounted device  600  includes a housing  604  and an elongate member  606 . The housing  604  has an interior space  624  that defines a first passage  648  and a second passage  650 . The first passage  648  extends in a serpentine shape from a first opening  628  to a first attachment point  638 . The first attachment point  638  is located in the first passage  648  at a position that is between a first lateral side  630  of the housing  604  and a lateral center of the housing  604 . The second passage  650  extends in a serpentine shape from a second opening  632  to a second attachment point  644 . The second attachment point  644  is located in the second passage  650  at a position that is between a second lateral side  634  of the housing  604  and a lateral center of the housing  604 . In some embodiments, the first attachment point  638  may be disposed at any distance from the first lateral side  630 . The second attachment point  644  may be disposed at any distance from the second lateral side  634 . The first passage  648  and the second passage  650  are generally serpentine shaped. The first passage  648  and the second passage  650  may, however, be configured differently. As examples, the first passage  648  and the second passage  650  may have any shape and/or may include any number of curves, bends, turns, spirals, or switchbacks in any configuration and/or orientation. The first passage  648  and the second passage  650  may or may not be the same shape. 
     In the illustrated example, a first end portion  636  of the elongate member  606  extends from the first attachment point  638 , along a first path  640  through the first passage  648 , and to the first opening  628 . A second end portion  642  extends from the second attachment point  644 , along a second path  646  through the second passage  650 , and to the second opening  632 . 
       FIG. 7  is a front cross-sectional view taken along line B-B of  FIG. 1  of a head mounted device  700  according to a sixth example. The head mounted device  700  may include features similar to those of the head mounted device  400  except as otherwise described. The head mounted device  700  may include lenses  752  and components  754 . In the illustrated example, the two lenses  752  are connected to the housing  704 . The lenses  752  may include one unitary lens or multiple lenses. Content from a display  720  may be viewed by the user through the lenses  752 . The components  754  are connected to any portion of the housing  704 . The components  754  may include any described components or devices supported by the housing  704 , including those previously described. 
     In the illustrated example, the head mounted device  700  includes a housing  704  and an elongate member  706 . The housing  704  has an interior space  724  that defines a first passage  748  and a second passage  750 . The first passage  748  extends laterally along a top side  756  of the housing  704  above the lenses  752  and components  754  from a first opening  728  to a first attachment point  738 . The first attachment point  738  is located in the first passage  748  at a position that is near a second lateral side  734  of the housing  704 . The second passage  750  extends laterally along a bottom side  758  of the housing  704  below the lenses  752  and components  754  from a second opening  732  to a second attachment point  744 . The second attachment point  744  is located in the second passage  750  at a position that is near a first lateral side  730  of the housing  704 . The first passage  748  and the second passage  750  are generally straight. The first passage  748  and the second passage  750  may, however, be configured differently. As examples, the first passage  748  and the second passage  750  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. The first passage  748  and the second passage  750  may or may not be the same shape. 
     In the illustrated example, a first end portion  736  of the elongate member  706  extends from the first attachment point  738 , along a first path  740  through the first passage  748 , and to the first opening  728 . A second end portion  742  extends from the second attachment point  744 , along a second path  746  through the second passage  750 , and to the second opening  732 . 
     In some embodiments, the first passage  748  may extend along the bottom side  758  of the housing  704 , and the second passage  750  may extend along the top side  756  of the housing  704 . In some embodiments, both the first passage  748  and the second passage  750  may extend along the top side  756  of the housing  704  or the bottom side  758  of the housing  704 . The interior space  724  of the housing  704  may also define one passage extending along the top side  756  of the housing  704  or the bottom side  758  of the housing  704 , through which both the first end portion  736  and the second end portion  742  extend. 
       FIG. 8  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  800  according to a seventh example. The head mounted device  800  may include features similar to those of the head mounted device  300  except as otherwise described. In the illustrated example, the head mounted device  800  includes a housing  804  and an elongate member  806 . The housing  804  has an interior space  824  that defines a passage  826 . The passage  826  extends from a first opening  828 , around a periphery of the housing  804  and around the lenses  852  and the components  854 , and to a second opening  832 . In the illustrated example, the passage  826  extends along a first lateral side  830 , a front side  860 , and a second lateral side  834  of the housing  804 . The first attachment point  838  is disposed near the second opening  832 . The second attachment point  844  is disposed near the first opening  828 . In some embodiments, the first attachment point  838  and the second attachment point  844  may be disposed anywhere on the housing  804 . 
     In the illustrated example, a first portion of the elongate member  806  extends through the passage  826  from the first opening  828  to the first attachment point  838 , and a second portion of the elongate member  806  extends through the passage  826  from the second opening  832  to the second attachment point  844 . Thus, the first and second portions of the elongate member  806  extend through a common passage in the illustrated example. In alternative implementations, the interior space  824  of the housing  804  may define a first passage that extends around the periphery of the housing  804  and around the lenses  852  and the components  854 , and along which the elongate member  806  may extend from the first opening  828  to the first attachment point  838 , as well as a second passage that extends around the periphery of the housing  804  and around the lenses  852  and the components  854 , and along which the elongate member  806  may extend from the second opening  832  to the second attachment point  844 . 
       FIG. 9  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  900  according to an eighth example in a retracted position. The head mounted device  900  may include features similar to those of the head mounted device  300  except as otherwise described. In the illustrated example, the head mounted device  900  includes a housing  904  and an elongate member  906 . The housing  904  has an interior space  924  that defines a passage  926 . The passage  926  extends from a first opening  928  located at a first lateral side  930  of the housing  904  to a second opening  932  located at a second lateral side  934  of the housing  904 . A first attachment point  938  is disposed inside the passage  926  at a location near the second lateral side  934  of the housing  904 . A second attachment point  944  is disposed inside the passage  926  at a location near the first lateral side  930  of the housing  904 . The passage  926  is generally straight. The passage  926  may, however, be configured differently. As examples, the passage  926  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. 
     In the illustrated example, a first end portion  936  of the elongate member  906  extends from the first attachment point  938 , along a first path  940  through the passage  926 , and to the first opening  928 . A second end portion  942  extends from the second attachment point  944 , along a second path  946  through the passage  926 , and to the second opening  932 . 
     The first end portion  936  may be connected to the housing  904  at the first attachment point  938  by a first spring  962 . The second end portion  942  may be connected to the housing  904  at the second attachment point  944  by a second spring  964 . The first spring  962  and the second spring  964  may be linear or variable rate extension, torsion, coil, flat, constant force, or any other suitable type of spring. The first spring  962  may or may not be identical to the second spring  964 . 
       FIG. 10  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device  900  according to the eighth example in an extended position. When the elongate member  906  is adjusted from the retracted position to the extended position (e.g., when the elongate member  906  is extended around the head of the user) the first spring  962  and the second spring  964  extend inside the passage  926  and exert tension on the elongate member  906 . The tension exerted on the elongate member  906  by the first spring  962  and the second spring  964  allow the elongate member  906  to support the housing  904  relative to the user&#39;s head. In the extended position, part of the first end portion  936  and part of the second end portion  942  are extended out of the passage  926  to the exterior of the housing  904 . When the elongate member  906  is removed from the user&#39;s head, the first spring  962  and the second spring  964  exert tension on the elongate member  906  until the first spring  962  and the second spring  964  are fully compressed. As a result, the first end portion  936  and the second end portion  942  of the elongate member  906  are retracted inside the passage  926 , and the elongate member  906  returns to the retracted position. 
       FIG. 11  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  1100  according to a ninth example in a retracted position. The head mounted device  1100  may include features similar to those of the head mounted device  400  and the head mounted device  900  except as otherwise described. In the illustrated example, the head mounted device  1100  includes a housing  1104  and an elongate member  1106 . The housing  1104  has an interior space  1124  that defines a first passage  1148  and a second passage  1150 . The first passage  1148  extends laterally across the housing  1104  from a first opening  1128  to a first attachment point  1138  that is located in the first passage  1148  at a position that is near a second lateral side  1134  of the housing  1104 . The second passage  1150  extends laterally from a second opening  1132  to a second attachment point  1144  that is located in the second passage  1150  at a position that is near a first lateral side  1130  of the housing  1104 . The first passage  1148  and the second passage  1150  shown in the illustrated example are generally straight. The first passage  1148  and the second passage  1150  may, however, be configured differently. As examples, the first passage  1148  and the second passage  1150  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. The first passage  1148  and the second passage  1150  may or may not be the same shape. 
     In the illustrated example, a first end portion  1136  of the elongate member  1106  extends from the first attachment point  1138 , along a first path  1140  through the first passage  1148 , and to the first opening  1128 . A second end portion  1142  extends from the second attachment point  1144 , along a second path  1146  through the second passage  1150 , and to the second opening  1132 . 
     The first end portion  1136  may be connected to the housing  1104  at the first attachment point  1138  by a first spring  1162 . The second end portion  1142  may be connected to the housing  1104  at the second attachment point  1144  by a second spring  1164 . The first spring  1162  and the second spring  1164  may be linear or variable rate extension, torsion, coil, flat, constant force, or any other suitable type of spring. The first spring  1162  may or may not be identical to the second spring  1164 . 
       FIG. 12  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device  1100  according to the ninth example in an extended position. When the elongate member  1106  is adjusted from the retracted position to the extended position, the first spring  1162  extends inside the first passage  1148 , and the second spring  1164  extends inside the second passage  1150 . The first spring  1162  and the second spring  1164  exert tension on the elongate member  1106 . As described with respect to  FIG. 10 , this tension allows the elongate member  1106  to support the housing  1104  relative to the user&#39;s head. In the extended position, part of the first end portion  1136  extends out of the first passage  1148 , and part of the second end portion  1142  extends out of the second passage  1150 . When the elongate member  1106  is adjusted to the retracted position, the first spring  1162  retracts the first end portion  1136  into the interior space  1124 , and the second spring  1164  retracts the second end portion  1142  into the interior space  1124 . 
       FIG. 13  is a side view of a head mounted device  1300  according to a tenth example in a retracted position. The head mounted device  1300  may include features similar to those of any head mounted device described. In the illustrated example, the head mounted device  1300  includes an elongate member  1306  and a housing  1304 . The elongate member  1306  includes a strap portion  1366  and a first cord  1368 . The first cord  1368  defines a first end portion  1336 . One end of the first cord  1368  is connected to a first attachment point  1338  inside the housing  1304 . An opposite end of the first cord  1368  is connected to a first end of the strap portion  1366 . In some embodiments, the elongate member  1306  may include a second cord (not shown) defining a second end portion. The second cord may be configured in the same way as the first cord  1368 . 
     The first cord  1368  and the second cord may be retracted into an interior space  1324  of the housing  1304  when the elongate member  1306  is in the retracted position. The first cord  1368  and the second cord may expand and contract elastically to adjust the length of the elongate member  1306 . The strap portion  1366  may have a greater width than the first cord  1368  and the second cord and may retain the head of the user. In some embodiments, the first cord  1368  and the second cord may be more elastic than the strap portion  1366 . The elongate member  1306  may include the first cord  1368 , the strap portion  1366 , and the second cord in any described embodiment. 
       FIG. 14  is a side view of the head mounted device  1300  according to the tenth example in an extended position. In the illustrated example, part of the first cord  1368  extends from inside the interior space  1324  of the housing  1304 . In some embodiments, part of the second cord also extends from inside the interior space  1324  of the housing  1304  when the elongate member  1306  is in the extended position. In the extended position, the strap portion  1366  may be engaged with a back portion of the user&#39;s head. 
       FIG. 15  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  1500  according to an eleventh example in a retracted position. The head mounted device  1500  may include features of the head mounted device  300  except as otherwise described. In the illustrated example, the head mounted device  1500  includes a housing  1504  and an elongate member  1506 . The housing  1504  has an interior space  1524  that defines a passage  1526 . The passage  1526  extends from a first opening  1528  located at a first lateral side  1530  of the housing  1504  to a second opening  1532  located at a second lateral side  1534  of the housing  1504 . A first attachment point  1538  is disposed inside the passage  1526  at a location near the second lateral side  1534  of the housing  1504 . A second attachment point  1544  is disposed inside the passage  1526  at a location near the first lateral side  1530  of the housing  1504 . The passage  1526  is generally straight. The passage  1526  may, however, be configured differently. As examples, the passage  1526  may be straight, may be curved, may define a serpentine configuration, or may be configured according to any other shape. 
     In the illustrated example, a first end portion  1536  of the elongate member  1506  extends from the first attachment point  1538 , along a first path  1540  through the passage  1526 , and to the first opening  1528 . A second end portion  1542  extends from the second attachment point  1544 , along a second path  1546  through the passage  1526 , and to the second opening  1532 . 
     The elongate member  1506  may include a first cord  1568  that defines the first end portion  1536 , a second cord  1570  that defines the second end portion  1542 , and a strap portion  1566  that connects the first cord  1568  and the second cord  1570 . The first cord  1568  extends from the strap portion  1566  to the first attachment point  1538 . The second cord  1570  extends from the strap portion  1566  to the second attachment point  1544 . In the retracted position, the first cord  1568  and the second cord  1570  are retracted into the interior space  1524  of the housing  1504  while the strap portion  1566  remains exterior to the housing  1504 . 
       FIG. 16  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device  1500  according to the eleventh example in an extended position. In the extended position, part of the first cord  1568  and part of the second cord  1570  extend from inside the interior space  1524  of the housing  1504  to the exterior of the housing  1504 . In the extended position, the strap portion  1566  may extend around the user&#39;s head. 
       FIG. 17  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  1700  according to a twelfth example. The head mounted device  1700  may include features similar to those of any head mounted device previously described. In the illustrated example, the head mounted device  1700  includes a housing  1704 , an elongate member  1706 , and an elongate member control mechanism  1772  coupled to an interior space  1724  of the housing  1704  in a location near a first lateral side  1730  of the housing  1704 . A first end portion  1736  of the elongate member  1706  is connected to the elongate member control mechanism  1772  at a first attachment point  1738  located in the interior space  1724  of the housing  1704  near the first lateral side  1730  of the housing  1704 . A second end portion  1742  of the elongate member  1706  is connected to the housing  1704  at a second attachment point  1744 . The second attachment point  1744  is located in the interior space  1724  of the housing  1704  near a second lateral side  1734  of the housing  1704 . The elongate member  1706  may include a first cord  1768  that defines the first end portion  1736 , a second cord  1770  that defines the second end portion  1742 , and a strap portion  1766  that connects the first cord  1768  and the second cord  1770 . 
     The elongate member control mechanism  1772  is operable to extend the elongate member  1706  outside of the interior space  1724  of the housing  1704  and/or retract the elongate member  1706  inside the interior space  1724  of the housing  1704 . The elongate member control mechanism  1772  can include a spool, winch, reel, ratchet, wheel, winder, or other device capable of retracting and/or extending a portion of the elongate member  1706 . The elongate member control mechanism  1772  may be actuated to extend and/or retract the elongate member  1706  by using any type of spring, spring-loaded spool, motorized spool, or other suitable extension and/or retraction mechanism. The elongate member control mechanism  1772  may apply axial tension on the elongate member  1706  to retract the elongate member  1706 . In some embodiments including the motorized spool, the motorized spool may be actuated by a stepper motor, linear motor, or any other suitable motor. The motorized spool may selectively extend and retract the elongate member  1706  between the retracted and extended positions. The motorized spool may be activated by a controller  1712  or by the user via a button, switch, or the like. The controller  1712  may include features similar to those of the controller  212 . 
     In some embodiments, the head mounted device  1700  may include an identity sensor adapted to detect a user identity. The identity sensor may be included in the sensors  210 . The identity sensor may be a biometric sensor and detect the user&#39;s retina, face, fingerprints, or the like. The identity sensor may also detect gestures and/or other devices associated with the user, such as a smartphone. 
     In response to receiving a signal from the identity sensor indicative of the user&#39;s identity, the controller  1712  may select a user identity profile corresponding to the user&#39;s identity. The user identity profile may include user settings, such as an operative length of the elongate member  1706 . The operative length of the elongate member  1706  may be the length of the elongate member  1706  extending around the user&#39;s head and/or the length of the elongate member  1706  retracted from the motorized spool. 
     In response to selecting the user identity profile, the controller  1712  may use the elongate member control mechanism  1772  to extend or retract the elongate member  1706  to the operative length according to the user identity profile. 
     In some embodiments, the head mounted device  1700  may include a haptic feedback feature. The controller  1712  may receive a signal indicative of images or other content experienced by the user. The content may include any media, still images, video, audio, or other information. In response to receiving the signal indicative of the content, the controller  1712  may use the elongate member control mechanism  1772  to extend or retract the elongate member  1706 . As a result, the elongate member control mechanism  1772  may tighten or loosen the elongate member  1706  around the user&#39;s head in response to the content. 
     In some embodiments, the head mounted device  1700  may include a pressure sensor in electrical communication with the controller  1712 . The pressure sensor may be included in the sensors  210 . The pressure sensor may be adapted to measure pressure between the head mounted device  1700  and the head of the user. In some embodiments, the content experienced by the user may be associated with a pressure value. In response to receiving a signal indicative of the content, the controller  1712  may cause the motorized spool to extend or retract the elongate member  1706  until the pressure (measured by the pressure sensor) between the user&#39;s head and the head mounted device  1700  reaches the pressure value. 
     In some embodiments, the controller  1712  may cause the motorized spool to extend or retract the elongate member  1706  in response to receiving a signal indicative of pressure (measured by the pressure sensor) between the user&#39;s head and the head mounted device  1700 . The controller  1712  may compare the measured pressure to a predetermined pressure value. Based on a determination that the measured pressure is not equal to the predetermined pressure value, the controller  1712  may use the elongate member control mechanism  1772  to extend or retract the elongate member  1706  to decrease or increase the pressure between the user&#39;s head and the head mounted device  1700  to the pressure value. 
       FIG. 18  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  1800  according to a thirteenth example. The head mounted device  1800  may include features similar to those of the head mounted device  1700  except as otherwise described. In the illustrated example, the head mounted device  1800  includes a housing  1804  and an elongate member  1806 . The head mounted device  1800  includes a first elongate member control mechanism  1872   a  coupled to an interior space  1824  of the housing  1804  in a location near a first lateral side  1830  of the housing  1804 . The head mounted device  1800  includes a second elongate member control mechanism  1872   b  coupled to the interior space  1824  of the housing  1804  in a location near a second lateral side  1834  of the housing  1804 . The first elongate member control mechanism  1872   a  and the second elongate member control mechanism  1872   b  may include features similar to those of the elongate member control mechanism  1772 . 
     A first end portion  1836  of the elongate member  1806  is connected to the first elongate member control mechanism  1872   a  at a first attachment point  1838 . The first attachment point  1838  is located in the interior space  1824  of the housing  1804  near the first lateral side  1830  of the housing  1804 . A second end portion  1842  of the elongate member  1806  is connected to the second elongate member control mechanism  1872   b  at a second attachment point  1844 . The second attachment point  1844  is located in the interior space  1824  of the housing  1804  near the second lateral side  1834  of the housing  1804 . The elongate member  1806  may include a first cord  1868  that defines the first end portion  1836 , a second cord  1870  that defines the second end portion  1842 , and a strap portion  1866  that connects the first cord  1868  and the second cord  1870 . The first elongate member control mechanism  1872   a  is operable to extend and/or retract the first end portion  1836  of the elongate member  1806 . The second elongate member control mechanism  1872   b  is operable to extend and/or retract the second end portion  1842  of the elongate member  1806 . 
       FIG. 19  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  1900  according to a fourteenth example. The head mounted device  1900  may include features similar to those of the head mounted device  1700  except as otherwise described. In the illustrated example, the head mounted device  1900  includes a housing  1904 , an elongate member  1906 , and an elongate member control mechanism  1972  coupled to an interior space  1924  of the housing  1904  in a location near a first lateral side  1930  of the housing  1904 . The elongate member control mechanism  1972  may include features similar to those of the elongate member control mechanism  1772 . A first end portion  1936  of the elongate member  1906  is connected to the elongate member control mechanism  1972  at a first attachment point  1938  located in the interior space  1924  of the housing  1904  near the first lateral side  1930  of the housing  1904 . A second end portion  1942  of the elongate member  1906  is connected to the housing  1904  at a second attachment point  1944 . The second attachment point  1944  is located in the interior space  1924  of the housing  1904  near a second lateral side  1934  of the housing  1904 . 
     The head mounted device  1900  includes an elongate member retaining mechanism  1974  connected to the housing  1904  near the first lateral side  1930 . The elongate member retaining mechanism  1974  is operable to engage the elongate member  1906  to restrain extension and retraction of the elongate member  1906  from the interior space  1924  of the housing  1904 . The elongate member retaining mechanism  1974  may be connected to the housing  1904  in the interior space  1924  of the housing  1904  or on an exterior of the housing  1904 . 
       FIG. 20  is a side view of the elongate member retaining mechanism  1974  in an open position.  FIG. 21  is a side view of the elongate member retaining mechanism  1974  of  FIG. 20  in a closed position. The elongate member retaining mechanism  1974  may include a clamp  1976  through which the elongate member  1906  extends and an actuator  1978  connected to the clamp  1976 . The actuator  1978  may selectively close the clamp  1976  to retain the elongate member  1906  in a closed position and open the clamp  1976  to release the elongate member  1906  in an open position. The actuator  1978  may include a magnet and electromagnet, solenoid, spring, motor, or any other suitable actuator. The actuator  1978  may be in electrical communication with a controller. The controller may include features similar to those of the controller  212 . The controller may use the actuator  1978  to move the elongate member retaining mechanism  1974  into the closed position to restrain the elongate member  1906  in the retracted position or the extended position. 
     In the illustrated example, the clamp  1976  includes a first member  1980  and a second member  1982 . The first member  1980  and the second member  1982  are connected to the housing  1904  such that a portion of the elongate member  1906  extends between the first member  1980  and the second member  1982 . The actuator  1978  may be connected to the first member  1980 , the second member  1982 , or both the first member  1980  and the second member  1982 . The actuator  1978  may move the first member  1980 , the second member  1982 , or both the first member  1980  and the second member  1982  to the closed position. In some embodiments, the second member  1982  may include a portion of the housing  1904 . 
     In the illustrated example, the first member  1980 , the second member  1982 , or both the first member  1980  and the second member  1982  may include protrusions  1984  configured to retain the elongate member  1906  between the first member  1980  and the second member  1982  when the clamp  1976  is in the closed position. The first member  1980 , the second member  1982 , or both the first member  1980  and the second member  1982  may include recesses corresponding to the protrusions  1984  such that the protrusions  1984  press the elongate member  1906  into the recesses when the clamp  1976  is in the closed position. 
       FIG. 22  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  2200  according to a fifteenth example. The head mounted device  2200  may include features similar to those of the head mounted device  1800  and the head mounted device  1900  except as otherwise described. In the illustrated example, the head mounted device  2200  includes a housing  2204  and an elongate member  2206 . The head mounted device  2200  includes a first elongate member control mechanism  2272   a  coupled to an interior space  2224  of the housing  2204  in a location near a first lateral side  2230  of the housing  2204 . The head mounted device  2200  includes a second elongate member control mechanism  2272   b  coupled to the interior space  2224  of the housing  2204  in a location near a second lateral side  2234  of the housing  2204 . The first elongate member control mechanism  2272   a  and the second elongate member control mechanism  2272   b  may include features similar to those of the elongate member control mechanism  1772 . 
     A first end portion  2236  of the elongate member  2206  is connected to the first elongate member control mechanism  2272   a  at a first attachment point  2238 . The first attachment point  2238  is located in the interior space  2224  of the housing  2204  near the first lateral side  2230  of the housing  2204 . A second end portion  2242  of the elongate member  2206  is connected to the second elongate member control mechanism  2272   b  at a second attachment point  2244 . The second attachment point  2244  is located in the interior space  2224  of the housing  2204  near the second lateral side  2234  of the housing  2204 . 
     The head mounted device  2200  may include a first elongate member retaining mechanism  2274   a  and a second elongate member retaining mechanism  2274   b . The first elongate member retaining mechanism  2274   a  and the second elongate member retaining mechanism  2274   b  may include features similar to those of the elongate member retaining mechanism  1974 . The first elongate member retaining mechanism  2274   a  and the second elongate member retaining mechanism  2274   b  may include features similar to those of the elongate member retaining mechanism  1974 . The first elongate member retaining mechanism  2274   a  is connected to the housing  2204  near the first lateral side  2230 . The second elongate member retaining mechanism  2274   b  is connected to the housing  2204  near the second lateral side  2234 . The first elongate member retaining mechanism  2274   a  restrains the first end portion  2236  of the elongate member  2206  from being extended from or retracted into the interior space  2224  of the housing  2204 . The second elongate member retaining mechanism  2274   b  restrains the second end portion  2242  of the elongate member  2206  from being extended from or retracted into the interior space  2224  of the housing  2204 . 
       FIG. 23  is a perspective view of a head mounted device  2300  according to a sixteenth example in a connected position.  FIG. 24  is a perspective view of the head mounted device  2300  according to the sixteenth example in a disconnected position. The head mounted device  2300  may include features similar to those of any described head mounted device. In the illustrated example, the head mounted device  2300  includes a housing  2304  and an elongate member  2306 . The head mounted device  2300  includes lenses  2352  coupled to the housing  2304 . The elongate member  2306  includes a first cord  2368 , a second cord  2370 , and a lens cover  2386  having at least one connector  2388 . One end of the lens cover  2386  is connected to a first attachment point  2338  using the first cord  2368 . The first attachment point  2338  is disposed in an interior space  2324  of the housing  2304  in a location near a first lateral side  2330  of the housing  2304 . The other end of the lens cover  2386  is connected to a second attachment point  2344  using the second cord  2370 . The second attachment point  2344  is disposed in the interior space  2324  of the housing  2304  in a location near a second lateral side  2334  of the housing  2304 . 
     The at least one connector  2388  removably connects to the housing  2304  and may be disposed on the periphery of the lens cover  2386 . The at least one connector  2388  may include any type of adhesive, magnets, stitching, hook-and-loop fasteners, welding, rivets, interference fit, snaps, fastener, or any other type of attachment. The housing  2304  may include connectors corresponding to the at least one connector  2388  disposed around the periphery of the lenses  2352  or at any other location on the housing  2304 . The at least one connector  2388  may removably connect to the corresponding connectors. The corresponding connectors may include any described attachment. 
     The lens cover  2386  is moveable relative to the housing  2304  between a connected position and a disconnected position. In the connected position shown in  FIG. 23 , the lens cover  2386  is connected to the housing  2304  using the at least one connector  2388  and substantially covers the lenses  2352 . In the disconnected position shown in  FIG. 24 , the lens cover  2386  contacts the back portion of the user&#39;s head when the elongate member  2306  is extended around the user&#39;s head. 
       FIG. 25  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  2500  according to a seventeenth example in a retracted position.  FIG. 26  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device  2500  according to the seventeenth example in an extended position. The head mounted device  2500  may include features similar to any head mounted device previously described. In the illustrated examples, the head mounted device  2500  includes a housing  2504  and an elongate member  2506 . The elongate member  2506  is connected at one end to an elongate member control mechanism  2572  at a first attachment point  2538  disposed in an interior space  2524  of the housing  2504  in a location near a first lateral side  2530  of the housing  2504 . The elongate member control mechanism  2572  may include features similar to those of the elongate member control mechanism  1772 . The elongate member  2506  is connected at the other end to a first magnetic connector  2590 . A second magnetic connector  2592  is connected to the housing  2504  near the second lateral side  2534 . A third magnetic connector  2594  is connected to the housing  2504  near the first lateral side  2530 . The first magnetic connector  2590 , the second magnetic connector  2592 , and the third magnetic connector  2594  may be any type of magnet or electromagnet of any shape and size. The magnetic poles of the first magnetic connector  2590 , the second magnetic connector  2592 , and the third magnetic connector  2594  may have any orientation. 
     The first magnetic connector  2590  and the second magnetic connector  2592  may be movable between a connected position and a disconnected position. In the disconnected position shown in  FIG. 25 , the elongate member  2506  is retracted into the interior space  2524 , and the first magnetic connector  2590  is connected to the third magnetic connector  2594  for storage of the elongate member  2506 . In the disconnected position, the elongate member  2506  is not extended around the user&#39;s head, and the housing  2504  is released with respect to the head of the user. In the connected position shown in  FIG. 26 , the elongate member  2506  is extended out of the interior space  2524 , and the first magnetic connector  2590  is connected to the second magnetic connector  2592 . In the connected position, the elongate member  2506  may be extended around the user&#39;s head, and the housing  2504  may be secured relative to the user&#39;s head. 
     In some embodiments, the first magnetic connector  2590  may include a magnetic protrusion, and the second magnetic connector  2592  may include a corresponding magnetic recess. In the connected position, the magnetic protrusion of the first magnetic connector  2590  may be connected to the second magnetic connector  2592  inside the magnetic recess. Additionally and/or alternatively, the first magnetic connector  2590  may include the magnetic recess, and the second magnetic connector  2592  may include the magnetic protrusion. 
       FIG. 27  is a top cross-sectional view taken along line A-A of  FIG. 1  of a head mounted device  2700  according to an eighteenth example in a retracted position.  FIG. 28  is a top cross-sectional view taken along line A-A of  FIG. 1  of the head mounted device  2700  according to the eighteenth example in an extended position. The head mounted device  2700  may include features similar to those of the head mounted device  2500  except as otherwise described. In the illustrated examples, the head mounted device  2700  includes a housing  2704 , a first elongate member  2706   a , and a second elongate member  2706   b . The first elongate member  2706   a  is connected at one end to a first elongate member control mechanism  2772   a  at a first attachment point  2738  disposed in an interior space  2724  of the housing  2704  in a location near a first lateral side  2730  of the housing  2704 . The other end of the first elongate member  2706   a  is connected to a first magnetic connector  2790 . The second elongate member  2706   b  is connected at one end to a second elongate member control mechanism  2772   b  at a second attachment point  2744  disposed in the interior space  2724  of the housing  2704  in a location near a second lateral side  2734  of the housing  2704 . The other end of the second elongate member  2706   b  is connected to a second magnetic connector  2792 . The first elongate member control mechanism  2772   a  and the second elongate member control mechanism  2772   b  may include features similar to those of the elongate member control mechanism  1772 . A third magnetic connector  2794  is connected to the housing  2704  near the first lateral side  2730 . A fourth magnetic connector  2796  is connected to the housing  2704  near the second lateral side  2734 . The first magnetic connector  2790 , the second magnetic connector  2792 , the third magnetic connector  2794 , and the fourth magnetic connector  2796  may include features similar to those of any other described magnetic connector. 
     The first magnetic connector  2790  and the second magnetic connector  2792  may be movable between a connected position and a disconnected position. In the disconnected position shown in  FIG. 27 , the first elongate member  2706   a  is retracted into the interior space  2724  near the first lateral side  2730 , and the second elongate member  2706   b  is retracted into the interior space  2724  near the second lateral side  2734 . The first magnetic connector  2790  is connected to the third magnetic connector  2794  for storage of the first elongate member  2706   a . The second magnetic connector  2792  is connected to the fourth magnetic connector  2796  for storage of the second elongate member  2706   b . In the disconnected position, the first elongate member  2706   a  and the second elongate member  2706   b  are not extended around the user&#39;s head, and the housing  2704  is released with respect to the head of the user. In the connected position shown in  FIG. 28 , the first elongate member  2706   a  is extended from the interior space  2724  near the first lateral side  2730 , and the second elongate member  2706   b  is extended from the interior space  2724  near the second lateral side  2734 . The first magnetic connector  2790  is connected to the second magnetic connector  2792 . In the connected position, the first elongate member  2706   a  and the second elongate member  2706   b  may be extended around the user&#39;s head, and the housing  2704  may be secured relative to the user&#39;s head. 
     In some embodiments, the first elongate member  2706   a  may be connected to the housing  2704  by a first spring-loaded spool, and the second elongate member  2706   b  may be connected to the housing  2704  by a second spring-loaded spool as described. 
     In some embodiments, the first elongate member  2706   a  may be connected to the housing  2704  by a first motorized spool, and the second elongate member  2706   b  may be connected to the housing  2704  by a second motorized spool as described. 
       FIG. 29  is a side view of a head mounted device  2900  according to a nineteenth example in a first position.  FIG. 30  is a side view of the head mounted device  2900  according to the nineteenth example in a second position. The head mounted device  2900  may include features similar to those of any head mounted device previously described. While being worn by the user, the head mounted device  2900  may slip from a first position (shown in  FIG. 29 ), which may be referred to as an original position, to a second position (shown in  FIG. 30 ). A change in position of the head mounted device  2900  may result in poor image quality and user discomfort. 
     In the illustrated example, the head mounted device  2900  includes a housing  2904  and an elongate member  2906  connected to the housing  2904 . The elongate member  2906  is extended around the head of the user such that the housing  2904  is secured relative to the user&#39;s head. The housing  2904  defines a display enclosure  2901 . The display enclosure  2901  is a space defined by the housing  2904  between the eyes of the user and a display  2920  through which the user views the content. 
     The head mounted device  2900  includes an elongate member control mechanism  2972  coupled to the housing  2904  and to the elongate member  2906 . The elongate member control mechanism  2972  may include features similar to those of the elongate member control mechanism  1772 . The elongate member control mechanism  2972  extends and retracts the elongate member  2906  into and out of the housing  2904  to move the display enclosure  2901  relative to the user&#39;s head. In some embodiments, a controller  2912  may use the elongate member control mechanism  2972  to move the head mounted device  2900  between the first position and the second position. The controller  2912  may include features similar to those of the controller  212 . 
     The head mounted device  2900  includes a first motion sensing device  2998  that detects movement of the display enclosure  2901 . The first motion sensing device  2998  may be included in the sensors  210 . The first motion sensing device  2998  may include an inertial measurement unit, magnetometer, accelerometer, gyroscope, or any other suitable motion sensor. The first motion sensing device  2998  is connected to the housing  2904 . The first motion sensing device  2998  may be coupled to the housing  2904  in the display enclosure  2901  or in any other location on the housing  2904 . 
     The head mounted device  2900  includes a second motion sensing device  2903  that detects motion of the elongate member  2906 . The second motion sensing device  2903  may include features similar to those of the first motion sensing device  2998 . The second motion sensing device  2903  is connected to the elongate member  2906 . The first motion sensing device  2998  and the second motion sensing device  2903  may send respective signals to the controller  2912  indicative of the motion of the display enclosure  2901  and the elongate member  2906 . 
       FIG. 31  is a flowchart showing a process  3100  for correcting an orientation of the head mounted device  2900  according to the nineteenth example. In operation  3105 , the first motion sensing device  2998  detects motion of the display enclosure  2901 . 
     In operation  3107 , the second motion sensing device  2903  detects motion of the elongate member  2906 . 
     In operation  3109 , the controller  2912  determines a change in position of the display enclosure  2901  relative to the elongate member  2906  based on the detected motion of the display enclosure  2901  and the detected motion of the elongate member  2906 . If the controller  2912  does not determine a change in position of the display enclosure  2901  relative to the elongate member  2906 , the controller  2912  may return to operation  3105 . 
     In operation  3111 , in response to a determination that the position of the display enclosure  2901  has changed relative to the elongate member  2906 , the controller  2912  applies a correction to the display enclosure  2901 . In some embodiments, the controller  2912  may iteratively repeat any of the described operations. 
     In some embodiments, applying the correction to the display enclosure  2901  in operation  3111  may include activating the elongate member control mechanism  2972  coupled to the elongate member  2906  to move the display enclosure  2901  to the first position. The controller  2912  may use the elongate member control mechanism  2972  to retract a portion of the elongate member  2906  into the housing  2904  to move the head mounted device  2900  from the second position to the first position. 
     In some embodiments, applying the correction to the display enclosure  2901  in operation  3111  may include applying software image correction to a display  2920 . The display  2920  may include features similar to those of the display  220 . If the content viewed by the user is distorted by movement of the head mounted device  2900 , the controller  2912  may re-render the content using the display  2920  to align the user&#39;s new field of view with the content such that the image viewed by the user is no longer distorted. 
     A physical environment refers to a physical world that people can sense and/or interact with without aid of electronic systems. Physical environments, such as a physical park, include physical articles, such as physical trees, physical buildings, and physical people. People can directly sense and/or interact with the physical environment, such as through sight, touch, hearing, taste, and smell. 
     In contrast, a computer-generated reality (CGR) environment refers to a wholly or partially simulated environment that people sense and/or interact with via an electronic system. In CGR, a subset of a person&#39;s physical motions, or representations thereof, are tracked, and, in response, one or more characteristics of one or more virtual objects simulated in the CGR environment are adjusted in a manner that comports with at least one law of physics. For example, a CGR system may detect a person&#39;s head turning and, in response, adjust graphical content and an acoustic field presented to the person in a manner similar to how such views and sounds would change in a physical environment. In some situations (e.g., for accessibility reasons), adjustments to characteristic(s) of virtual object(s) in a CGR environment may be made in response to representations of physical motions (e.g., vocal commands). 
     A person may sense and/or interact with a CGR object using any one of their senses, including sight, sound, touch, taste, and smell. For example, a person may sense and/or interact with audio objects that create 3D or spatial audio environment that provides the perception of point audio sources in 3D space. In another example, audio objects may enable audio transparency, which selectively incorporates ambient sounds from the physical environment with or without computer-generated audio. In some CGR environments, a person may sense and/or interact only with audio objects. 
     Examples of CGR include virtual reality and mixed reality. 
     A virtual reality (VR) environment refers to a simulated environment that is designed to be based entirely on computer-generated sensory inputs for one or more senses. A VR environment comprises a plurality of virtual objects with which a person may sense and/or interact. For example, computer-generated imagery of trees, buildings, and avatars representing people are examples of virtual objects. A person may sense and/or interact with virtual objects in the VR environment through a simulation of the person&#39;s presence within the computer-generated environment, and/or through a simulation of a subset of the person&#39;s physical movements within the computer-generated environment. 
     In contrast to a VR environment, which is designed to be based entirely on computer-generated sensory inputs, a mixed reality (MR) environment refers to a simulated environment that is designed to incorporate sensory inputs from the physical environment, or a representation thereof, in addition to including computer-generated sensory inputs (e.g., virtual objects). On a virtuality continuum, a mixed reality environment is anywhere between, but not including, a wholly physical environment at one end and virtual reality environment at the other end. 
     In some MR environments, computer-generated sensory inputs may respond to changes in sensory inputs from the physical environment. Also, some electronic systems for presenting an MR environment may track location and/or orientation with respect to the physical environment to enable virtual objects to interact with real objects (that is, physical articles from the physical environment or representations thereof). For example, a system may account for movements so that a virtual tree appears stationery with respect to the physical ground. 
     Examples of mixed realities include augmented reality and augmented virtuality. 
     An augmented reality (AR) environment refers to a simulated environment in which one or more virtual objects are superimposed over a physical environment, or a representation thereof. For example, an electronic system for presenting an AR environment may have a transparent or translucent display through which a person may directly view the physical environment. The system may be configured to present virtual objects on the transparent or translucent display, so that a person, using the system, perceives the virtual objects superimposed over the physical environment. Alternatively, a system may have an opaque display and one or more imaging sensors that capture images or video of the physical environment, which are representations of the physical environment. The system composites the images or video with virtual objects and presents the composition on the opaque display. A person, using the system, indirectly views the physical environment by way of the images or video of the physical environment, and perceives the virtual objects superimposed over the physical environment. As used herein, a video of the physical environment shown on an opaque display is called “pass-through video,” meaning a system uses one or more image sensor(s) to capture images of the physical environment and uses those images in presenting the AR environment on the opaque display. Further alternatively, a system may have a projection system that projects virtual objects into the physical environment, for example, as a hologram or on a physical surface, so that a person, using the system, perceives the virtual objects superimposed over the physical environment. 
     An augmented reality environment also refers to a simulated environment in which a representation of a physical environment is transformed by computer-generated sensory information. For example, in providing pass-through video, a system may transform one or more sensor images to impose a select perspective (e.g., viewpoint) different than the perspective captured by the imaging sensors. As another example, a representation of a physical environment may be transformed by graphically modifying (e.g., enlarging) portions thereof, such that the modified portion may be representative but not photorealistic versions of the originally captured images. As a further example, a representation of a physical environment may be transformed by graphically eliminating or obfuscating portions thereof. 
     An augmented virtuality (AV) environment refers to a simulated environment in which a virtual or computer-generated environment incorporates one or more sensory inputs from the physical environment. The sensory inputs may be representations of one or more characteristics of the physical environment. For example, an AV park may have virtual trees and virtual buildings, but people with faces photorealistically reproduced from images taken of physical people. As another example, a virtual object may adopt a shape or color of a physical article imaged by one or more imaging sensors. As a further example, a virtual object may adopt shadows consistent with the position of the sun in the physical environment. 
     There are many different types of electronic systems that enable a person to sense and/or interact with various CGR environments. Examples include head mounted systems, projection-based systems, heads-up displays (HUDs), vehicle windshields having integrated display capability, windows having integrated display capability, displays formed as lenses designed to be placed on a person&#39;s eyes (e.g., similar to contact lenses), headphones/earphones, speaker arrays, input systems (e.g., wearable or handheld controllers with or without haptic feedback), smartphones, tablets, and desktop/laptop computers. A head mounted system may have one or more speaker(s) and an integrated opaque display. Alternatively, a head mounted system may be configured to accept an external opaque display (e.g., a smartphone). The head mounted system may incorporate one or more imaging sensors to capture images or video of the physical environment, and/or one or more microphones to capture audio of the physical environment. Rather than an opaque display, a head mounted system may have a transparent or translucent display. The transparent or translucent display may have a medium through which light representative of images is directed to a person&#39;s eyes. The display may utilize digital light projection, OLEDs, LEDs, uLEDs, liquid crystal on silicon, laser scanning light source, or any combination of these technologies. The medium may be an optical waveguide, a hologram medium, an optical combiner, an optical reflector, or any combination thereof. In one embodiment, the transparent or translucent display may be configured to become opaque selectively. Projection-based systems may employ retinal projection technology that projects graphical images onto a person&#39;s retina. Projection systems also may be configured to project virtual objects into the physical environment, for example, as a hologram or on a physical surface. 
     As described above, one aspect of the present technology is the gathering and use of data available from various sources to allow the head mounted devices described herein to accommodate users having varying head sizes. The present disclosure contemplates that in some instances, this gathered data may include personal information data that uniquely identifies or can be used to contact or locate a specific person. Such personal information data can include demographic data, location-based data, telephone numbers, email addresses, Twitter IDs, home addresses, data or records relating to a user&#39;s health or level of fitness (e.g., vital signs measurements, medication information, exercise information), date of birth, or any other identifying or personal information. 
     The present disclosure recognizes that the use of such personal information data, in the present technology, can be used to the benefit of users. For example, the personal information data can be used to create a user identity profile that is associated with a user&#39;s preferred head mounted device settings. Further, other uses for personal information data that benefit the user are also contemplated by the present disclosure. For instance, health and fitness data may be used to provide insights into a user&#39;s general wellness or may be used as positive feedback to individuals using technology to pursue wellness goals. 
     The present disclosure contemplates that the entities responsible for the collection, analysis, disclosure, transfer, storage, or other use of such personal information data will comply with well-established privacy policies and/or privacy practices. In particular, such entities should implement and consistently use privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining personal information data private and secure. Such policies should be easily accessible by users and should be updated as the collection and/or use of such data changes. Personal information from users should be collected for legitimate and reasonable uses of the entity and not shared or sold outside of those legitimate uses. Further, such collection/sharing should occur after receiving the informed consent of the users. Additionally, such entities should consider taking any needed steps for safeguarding and securing access to such personal information data and ensuring that others with access to the personal information data adhere to such entities&#39; privacy policies and procedures. Further, such entities can subject themselves to evaluation by third parties to certify their adherence to widely accepted privacy policies and practices. In addition, policies and practices should be adapted for the particular types of personal information data being collected and/or accessed and adapted to applicable laws and standards, including jurisdiction-specific considerations. For instance, in the United States, the collection of or access to certain health data may be governed by federal and/or state laws, such as the Health Insurance Portability and Accountability Act (HIPAA); whereas health data in other countries may be subject to other regulations and policies and should be handled accordingly. Hence, different privacy practices should be maintained for different personal data types in each country. 
     Despite the foregoing, the present disclosure also contemplates embodiments in which users selectively block the use of, or access to, their personal information data. That is, the present disclosure contemplates that hardware and/or software elements can be provided to prevent or block access to such personal information data. For example, in the case of head mounted devices, the present technology can be configured to allow users to select to “opt in” or “opt out” of participation in the collection of personal information data during registration for services or anytime thereafter. In another example, users can opt out of providing (i.e., choose not to provide) their preferred head mounted device settings for adjustment of the head mounted device. In yet another example, users can opt to limit the length of time that their preferred settings are maintained or entirely prohibit the development of preferred settings. In addition to providing “opt in” and “opt out” options, the present disclosure contemplates providing notifications relating to the access or use of personal information. For instance, users may be notified upon downloading an app that their personal information data will be accessed and then reminded again just before their personal information data is accessed by the app. 
     Moreover, it is the intent of the present disclosure that personal information data should be managed and handled in such a manner as to minimize the risk of unintentional or unauthorized access to or use of such personal information data. Such risk can be minimized by limiting the collection of data and deleting data once it is no longer needed. In addition, and when applicable, including in certain health-related applications, data de-identification can be used to protect users&#39; privacy. De-identification may be facilitated, when appropriate, by removing specific identifiers (e.g., date of birth, etc.), controlling the amount or specificity of data stored (e.g., collecting location data at a city level rather than at an address level), controlling how data is stored (e.g., aggregating data across users), and/or other methods. 
     Therefore, although the present disclosure broadly covers the use of personal information data to implement one or more of the various disclosed embodiments, the present disclosure also contemplates that the various embodiments can also be implemented without the need for accessing such personal information data. That is, the various embodiments of the present technology are not rendered inoperable due to the lack of all or a portion of such personal information data. For example, the head mounted devices described herein may be adjusted manually or adjusted based on non-personal information data or a bare minimum amount of personal information, such as the content being requested by the device associated with a user, other non-personal information available to the head mounted device, or publicly available information. 
     While the disclosure includes certain embodiments, the disclosure is not to be limited to the described embodiments but is intended to cover modifications and equivalent configurations included within the scope of the appended claims. The scope of the appended claims is to be accorded the broadest interpretation as is permitted under the law so as to encompass all such modifications and equivalent configurations.

Metadata:
Filing Date: 20190712
Publication Date: 20211019
Grant Date: 20211019
Priority Date: 20180911
Inventors: SMITH, SAMUEL G.
LEE, JAE HWANG
KALINOWSKI, DAVID A.
DALKE, CLAIRE E.
Assignee: APPLE INC
CPC Classifications: [{"code": "G02B2027/0154", "inventive": false, "first": false, "tree": "[]"}, {"code": "G02B27/0176", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": true, "tree": "[]"}, {"code": "G06F3/011", "inventive": true, "first": false, "tree": "[]"}, {"code": "G02B7/021", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": true, "tree": "[]"}, {"code": "G02B7/021", "inventive": true, "first": false, "tree": "[]"}, {"code": "G06F1/163", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 78083307