Abstract:
An aspect provides an expandable pen, including: an internal portion; an external portion that is flexible; and a biased component that is flexible and positioned between the internal portion and the external portion; the biased component applying force to the external portion to flex it away from the internal portion. Other aspects are described and claimed.

Description:
BACKGROUND 
     Information handling devices (“devices”) come in a variety of forms, for example laptop computing devices, tablet computing devices, smart phones, e-readers, MP3 players, and the like. Many such devices are configured for use with a pen or stylus (hereinafter simply “pen”) as a mode of input. 
     Certain form factors, e.g., tablets, are very thin and are getting thinner. For example, it is common for tablets to have a thickness or width dimension on the order of approximately 7 mm or less. Nonetheless, users of these devices continue to desire the support of pen interfaces. 
     BRIEF SUMMARY 
     In summary, one aspect provides an expandable pen, comprising: an internal portion; an external portion that is flexible; and a biased component that is flexible and positioned between the internal portion and the external portion; the biased component applying force to the external portion to flex it away from the internal portion. 
     Another aspect provides a system, comprising: an information handling device, comprising: a housing including: a pen input surface operatively coupled to one or more processors that process pen input; said housing further comprising a cavity therein for housing a pen; and an expandable pen, comprising: an internal portion; an external portion that is flexible; and a biased component that is flexible and positioned between the internal portion and the external portion; the biased component applying force to the external portion to flex it away from the internal portion. 
     A further aspect provides an expandable pen, comprising: a internal portion terminating in a tip; a circumferential external portion that is flexible an disposed proximate to the tip; and a plurality of biased components that are flexible and positioned between the internal portion and the circumferential external portion; the plurality of biased components applying force to the circumferential external portion to flex it away from the internal portion. 
     The foregoing is a summary and thus may contain simplifications, generalizations, and omissions of detail; consequently, those skilled in the art will appreciate that the summary is illustrative only and is not intended to be in any way limiting. 
     For a better understanding of the embodiments, together with other and further features and advantages thereof, reference is made to the following description, taken in conjunction with the accompanying drawings. The scope of the invention will be pointed out in the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  illustrates an example of information handling device circuitry. 
         FIG. 2  illustrates another example of information handling device circuitry. 
         FIG. 3  illustrates an example information handling device and housing thereof 
         FIG. 4 . illustrates an example expandable pen. 
     
    
    
     DETAILED DESCRIPTION 
     It will be readily understood that the components of the embodiments, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations in addition to the described example embodiments. Thus, the following more detailed description of the example embodiments, as represented in the figures, is not intended to limit the scope of the embodiments, as claimed, but is merely representative of example embodiments. 
     Reference throughout this specification to “one embodiment” or “an embodiment” (or the like) means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearance of the phrases “in one embodiment” or “in an embodiment” or the like in various places throughout this specification are not necessarily all referring to the same embodiment. 
     Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments. One skilled in the relevant art will recognize, however, that the various embodiments can be practiced without one or more of the specific details, or with other methods, components, materials, et cetera. In other instances, well known structures, materials, or operations are not shown or described in detail to avoid obfuscation. 
     The illustrated example embodiments will be best understood by reference to the figures. The following description is intended only by way of example, and simply illustrates certain example embodiments. 
     Referring to  FIG. 1  and  FIG. 2 , while various other circuits, circuitry or components may be utilized in information handling devices, with regard to smart phone and/or tablet circuitry  200 , an example illustrated in  FIG. 2  includes an ARM based system (system on a chip) design, with software and processor(s) combined in a single chip  210 . Internal busses and the like depend on different vendors, but essentially all the peripheral devices ( 220 ) may attach to a single chip  210 . In contrast to the circuitry illustrated in  FIG. 1 , the tablet circuitry  200  combines the processor, memory control, and I/O controller hub all into a single chip  210 . Also, ARM based systems  200  do not typically use SATA or PCI or LPC. Common interfaces for example include SDIO and I2C. 
     There are power management chip(s)  230 , e.g., a battery management unit, BMU, which manage power as supplied for example via a rechargeable battery  240 , which may be recharged by a connection to a power source (not shown). In at least one design, a single chip, such as  210 , is used to supply BIOS like functionality and DRAM memory. 
     ARM based systems  200  typically include one or more of a WWAN transceiver  250  and a WLAN transceiver  260  for connecting to various networks, such as telecommunications networks and wireless base stations. Commonly, an ARM based system  200  will include a touch screen  270  for data input and display. ARM based systems  200  also typically include various memory devices, for example flash memory  280  and SDRAM  290 . 
       FIG. 1 , for its part, depicts a block diagram of another example of information handling device circuits, circuitry or components. The example depicted in  FIG. 1  may correspond to computing systems such as the THINKPAD series of personal computers sold by Lenovo (US) Inc. of Morrisville, N.C., or other devices. As is apparent from the description herein, embodiments may include other features or only some of the features of the example illustrated in  FIG. 1 . 
     The example of  FIG. 1  includes a so-called chipset  110  (a group of integrated circuits, or chips, that work together, chipsets) with an architecture that may vary depending on manufacturer (for example, INTEL, AMD, ARM, etc.). The architecture of the chipset  110  includes a core and memory control group  120  and an I/O controller hub  150  that exchanges information (for example, data, signals, commands, et cetera) via a direct management interface (DMI)  142  or a link controller  144 . In  FIG. 1 , the DMI  142  is a chip-to-chip interface (sometimes referred to as being a link between a “northbridge” and a “southbridge”). The core and memory control group  120  include one or more processors  122  (for example, single or multi-core) and a memory controller hub  126  that exchange information via a front side bus (FSB)  124 ; noting that components of the group  120  may be integrated in a chip that supplants the conventional “northbridge” style architecture. 
     In  FIG. 1 , the memory controller hub  126  interfaces with memory  140  (for example, to provide support for a type of RAM that may be referred to as “system memory” or “memory”). The memory controller hub  126  further includes a LVDS interface  132  for a display device  192  (for example, a CRT, a flat panel, touch screen, et cetera). A block  138  includes some technologies that may be supported via the LVDS interface  132  (for example, serial digital video, HDMI/DVI, display port). The memory controller hub  126  also includes a PCI-express interface (PCI-E)  134  that may support discrete graphics  136 . 
     In  FIG. 1 , the I/O hub controller  150  includes a SATA interface  151  (for example, for HDDs, SDDs,  180  et cetera), a PCI-E interface  152  (for example, for wireless connections  182 ), a USB interface  153  (for example, for devices  184  such as a digitizer, keyboard, mice, cameras, phones, microphones, storage, other connected devices, et cetera), a network interface  154  (for example, LAN), a GPIO interface  155 , a LPC interface  170  (for ASICs  171 , a TPM  172 , a super I/O  173 , a firmware hub  174 , BIOS support  175  as well as various types of memory  176  such as ROM  177 , Flash  178 , and NVRAM  179 ), a power management interface  161 , a clock generator interface  162 , an audio interface  163  (for example, for speakers  194 ), a TCO interface  164 , a system management bus interface  165 , and SPI Flash  166 , which can include BIOS  168  and boot code  190 . The I/O hub controller  150  may include gigabit Ethernet support. 
     The system, upon power on, may be configured to execute boot code  190  for the BIOS  168 , as stored within the SPI Flash  166 , and thereafter processes data under the control of one or more operating systems and application software (for example, stored in system memory  140 ). An operating system may be stored in any of a variety of locations and accessed, for example, according to instructions of the BIOS  168 . As described herein, a device may include fewer or more features than shown in the system of  FIG. 1 . 
     Information handling devices, as for example outlined in  FIG. 1  and  FIG. 2 , may provide user interfaces that accept pen input (e.g., via a digitizer or touch screen input device). It should be noted that pens may be passive or active, as further described herein. Many users have become accustomed to using pen inputs. However, as described herein, the devices continue to get thinner, i.e., have reduced thickness or width dimensions, with some devices being on the order of 7 mm thick or less. It is very likely that many existing devices will become even thinner in the near future. Moreover, devices accepting pen input may include user-wearable devices, which may also have a thin profile, e.g., not sufficient for accommodating pen docks for larger diameter pens. 
     In order to accommodate what most users are accustomed to in terms of ergonomics, a sufficiently thick or sizable pen is required, e.g., a pen diameter that allows for ease of handling, comfort, etc. To dock a pen in a 7 mm tablet without increasing the tablet thickness requires the pen to be approximately 5 mm diameter or less. This is not desirable from a pen user experience point of view, as the pen is too thin and it is difficult for user to hold and use it. A customary pen diameter is approximately 7.5 mm to 8.5 mm. To dock (internally) this diameter pen would require a tablet at least 10 mm thick, which as above, is much thicker than the desired 7 mm or less. Simply providing a bump on the edge of the device that is thick enough to dock a thicker pen is undesirable from both an aesthetic and functional standpoint as it disrupts the overall appearance and feel of the device as well as introducing asymmetry into the device layout that may negatively impact performance (e.g., ability to lie flat on a surface). 
     Accordingly an embodiment provides a thin device (e.g., 7 mm or less in the width dimension) that also supports a desirable pen diameter (e.g., approximately 7.5 mm to 8.5 mm) with the ability to dock the pen with the device (e.g., tablet) without increasing the device thickness. 
     Illustrated in  FIG. 3  is a perspective representation of an example tablet device  301 . In  FIG. 3  it can be appreciated that the length dimension (e.g., across the bottom of the device  301 ) and the height dimension (e.g., along the side of the device  301 ) are substantially greater than or exceed the width dimension of the device (e.g., the thickness of the device  301 ). The width dimension defines how thick or thin the device  301  is and as described herein the devices are trending toward thinner profiles (i.e., reduced width dimension). As described herein, conventional docking mechanisms for pens, e.g., providing a circular or pen shaped slot or cavity  302  within the device for inserting the pen  303  into the cavity  302  of the device is not viable while maintaining the current trend towards reduced width dimensions, unless reduced pen  303  diameters are accepted. 
       FIG. 4  illustrates a cross sectional view of an example expandable pen  403 . Here it can be appreciated that an embodiment provides an expandable pen  403  that, in a collapsed condition, has a first diameter (D 1 ) and in an expanded condition has a second diameter (D 2 ). The collapsed condition is obtained by inserting the expandable pen  403  into a cavity (e.g.,  302 ) of a device and thus providing collapsing or insertion force to the exterior of the expandable pen  403 . The expanded condition or resting condition is obtained by withdrawing the expandable pen  403  from the cavity (e.g.,  302 ) and thus relieving the collapsing or insertion force from the exterior of the expandable pen  403 . 
     An embodiment may utilize a mechanism, e.g., a spring mechanism including one or more springs  405 , to provide an adaptable diameter expandable pen  403 . The diameter may vary from, in a collapsed position, about 5 mm or less to, in an expanded condition, about 8 mm or more. In an embodiment, a biased component  406 , e.g., formed of a resilient material such as spring steel, is housed within the expandable pen  403  such that it imparts force against an exterior portion  407 , e.g. formed of a flexible material such as rubber or other like material, whereby a smooth, ergonomic shaft having an increased diameter (e.g., D 2 ) is formed in a resting condition. 
     In an embodiment, the size change occurs automatically upon insertion/removal of the expandable pen  403  from a cavity (e.g.,  302 ) in an information handling device such as a tablet or smart phone. When removing the expandable pen  403  from the cavity, a lack of insertion force or other compression force (e.g., imparted by walls of the cavity) allows a spring  405  to force internal components (e.g., shuttle(s)  408  on track(s)  409 ) into a position that imparts an outward/projection/expansion force to biased component(s)  406  away from a central (also referred to herein as an internal) portion  410 , which in turn forces the exterior portion  407  outward to achieve the second diameter D 2 . On insertion, the walls of the cavity force (via insertion force) the exterior portion  407  inward, which in turn applies a force to biased component(s)  406 , which in turn move internal mechanisms (e.g., shuttle(s)  408 /spring(s)  405 ) to transition distal (away from the tip  404 ) and therefor allow the expandable pen  403  to collapse to the first diameter D 1 . 
     As will be readily understood, the mechanism described above may be modified as desired. For example, instead of a passive expanding/collapsing under insertion force, a trigger (e.g., button press) may be utilized to trigger the expandable pen&#39;s  403  shape change (i.e., expanding/collapsing) and thus the diameter change. The trigger may be a purely mechanical trigger, e.g., a button press translated into a corresponding collapsing/expanding force and moving of a spring mechanism, or may be used to activate an electronic movement within the expandable pen, e.g., as powered by one or more batteries, which in turn operates on a biased component to impart expanding/collapsing between the diameters. 
     Moreover, the example illustrated in  FIG. 4  may include two or more (i.e., a plurality of) biased components  406 . In one example embodiment, a plurality of biased components  405  are included such that, on withdrawal from a cavity (or activation of a trigger, as described herein), the plurality of biased components  405  are transitioned outward at discrete points, e.g., similar to an umbrella, such that an overlying single exterior component  407 , e.g., formed of rubber or other pliable synthetic material, forms a smooth, ergonomic (i.e., circumferential) exterior having an increased diameter. Thus, the expandable pen  403  achieves a larger, more user friendly diameter while withdrawn from a cavity (or otherwise triggered to expand) but at the same time permits the expandable pen  403  to be collapsed and inserted into the (smaller) cavity for retention within the thinner profile information handling devices. 
     It is worth noting that the expandable pen  403  is to be used with a pen input surface of an information handling device, e.g., a digitizer of a computing device or a touch screen of a tablet computer or smart phone. Therefore, the expandable pen  403  may simply be passively involved with pen input, e.g., not transmitting any electronic/electromagnetic signal, such as for use with a capacitive pen input surface. Alternatively or additionally, the expandable pen  403  may be an active pen, e.g., including electronic components. The electronic components of the expandable pen  403 , if included, may take a variety of forms. For example, the electronic components may be passive coils that receive energy from the pen input surface and thereafter transmit energy back to the pen input surface. Alternatively, the electronic components of the expandable pen  403  may be active, i.e., use internal power (e.g., as supplied by one or more batteries) to actively transmit energy detectable by the pen input surface of the information handling device. 
     As will be appreciated by one skilled in the art, various aspects may be embodied as a system, method or device program product. Accordingly, aspects may take the form of an entirely hardware embodiment or an embodiment including software that may all generally be referred to herein as a “circuit,” “element” or “system.” Furthermore, aspects may take the form of a device program product embodied in one or more device readable medium(s) having device readable program code embodied therewith. 
     Any combination of one or more non-signal device readable medium(s) may be utilized. The non-signal medium may be a storage medium. Aspects are described herein with reference to the figures, which illustrate examples. It will be understood some actions and functionality may be implemented at least in part by program instructions. These program instructions may be provided to a processor, such that the instructions, which execute via a processor of the device, implement functions/acts. 
     This disclosure has been presented for purposes of illustration and description but is not intended to be exhaustive or limiting. Many modifications and variations will be apparent to those of ordinary skill in the art. The example embodiments were chosen and described in order to explain principles and practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated. 
     Thus, although illustrative example embodiments have been described herein with reference to the accompanying figures, it is to be understood that this description is not limiting and that various other changes and modifications may be affected therein by one skilled in the art without departing from the scope or spirit of the disclosure.