Abstract:
A connector system for a miniaturized form factor card allows a communications system for mobile information devices having an applications processor and user interface components. A receiving frame is provided in the mobile information device for an insertable miniaturized form factor card incorporating means for RF transmission and reception and a wireless modem. A connector moiety on the card is received in a mating moiety in the receiving frame. The applications processor and the user interface components in the mobile information device are interconnected to digital functions of the wireless modem and means for RF transmission and reception through the connector.

Description:
REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation-in-part of U.S. application Ser. No. 11/308559 filed on Apr. 6, 2006 entitled CONNECTOR FOR A HIGHLY INTEGRATED, INSTALLABLE MINIATURIZED FORM FACTOR CARD FOR WIRELESS COMMUNICATIONS FUNCTIONS. 
     
     BACKGROUND OF THE INVENTION  
       [0002]    1. Field of the Invention 
         [0003]    This invention relates generally to the field of operating platforms for mobile phones and personal data systems and more particularly to a connector system with integral alignment elements to be employed with generic mobile information devices for a wireless communications card with a miniaturized form factor which is insertable into the mobile information devices to accommodate desired wireless communication functions. 
         [0004]    2. Related Art 
         [0005]    Current design time-to-market for mobile phone and personal information devices is extended due to current design philosophy and practice. Turn-around time for a typical complete handset design is about 9 months. Currently terminal vendors need to spend significant amount of resources on basic wireless communication functions and cannot concentrate on truly value-added design works, such as industrial design and software applications. It is also difficult to develop multiple models with significant differences based on a common printed circuit board (PCB) platform. Traditional wireless devices using discrete solution have difficulty supporting multiple band or modes such as GSM, CDMA, 3G. Discrete chipset solutions consume at least three times more PCB space. There are significant financial and technical barriers of entry for new companies without significant resources, or established companies without wireless expertise. 
         [0006]    Currently there are some vendors selling modules that can provide wireless communication functions in a particular wireless technology. However these modules are large in size with proprietary interfaces. These modules require significant amount of vendor integration. Alternatively, certain prior art systems are simply modularizing wireless modem functions. Prior art systems for removable cartridges providing communications elements such as that disclosed in U.S. Pat. No. 6,690,947 to Tom provide some flexibility in applications design; however, such systems were bulky and lacked packaging and connector innovations required for practical application of such systems. 
         [0007]    U.S. patent application Ser. No. 11/308221 filed on Mar. 13, 2006 entitled MINIATURIZED FORM FACTOR WIRELESS COMMUNICATIONS CARD FOR GENERIC MOBILE INFORMATION DEVICES, which is incorporated herein by reference in its entirety as though fully set forth, provides a system that can save RF tuning, debugging and certification thereby reducing design lead time significantly. This system provides the ability to integrate hardware, software, utilities and drivers which will allow true plug and play functionality for end users or mobile information device design houses. The desired functional capability is provided through an insertable card to eliminate the requirement for a separate CPU or applications processor in the mobile information device and additionally, provides a complete modem solution that will support multi-mode and multi-band. 
         [0008]    To enhance the space savings and weight reduction to permit more compact portable devices and flexible designs and integrate chipset and passive components into a common module, the system provided in copending patent application Ser. No. 11/308559 filed on Apr. 6, 2006 entitled CONNECTOR FOR A HIGHLY INTEGRATED, INSTALLABLE MINIATURIZED FORM FACTOR CARD FOR WIRELESS COMMUNICATIONS FUNCTIONS, which is incorporated herein by reference as though fully set forth, employs integral connector systems having standard interfaces and indexing for mating to PC boards within the mobile information device platforms and to properly index and mate the miniaturized form factor card. To further enhance the connector in such a common module it is desirable that the connector system incorporate integral alignment systems for accurate placement of the miniature form factor card within the connector system and the connector system on the printed circuit board in the generic mobile information devices. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention provides a connector arrangement for a wireless communications card for mobile information devices with user interface components. A receiving frame is mounted on a printed circuit board in the mobile information device to receive an insertable miniaturized form factor card incorporating means for RF transmission and reception and a wireless modem. The receiving frame incorporates a first set alignment elements arranged in substantially diagonal relationship on a bottom surface of the frame. An indexing connector moiety is present on the card which is received in a mating moiety in the receiving frame and the card incorporates a set of alignment elements for engagement with a set of mating alignment elements on a top surface of the frame. The frame also incorporates a receiving element for an elastomeric connector providing the mating connector moiety. A set of indexing elements on the receiving element enhances alignment of the elastomeric connector. The PC board in the mobile information device includes mating alignment elements for the first alignment elements on the frame to precisely position the frame with respect to mating connector elements on the PC board for the elastomeric connector. The applications processor, the user interface components, or both in the mobile information device are interconnected to digital functions of the wireless modem and means for RF transmission and reception through the precise alignment connector. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    These and other features and advantages of the present invention will be better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein: 
           [0011]      FIGS. 1A-1E  are top, side, bottom, isometric top and isometric bottom views of a miniaturized form factor card employed in a connector system according to the present invention and an exemplary mobile information device; 
           [0012]      FIG. 2  is an isometric top view of a miniaturized form factor card and the receiving frame with closure element as mounted on a PC board of a Mobile Information Device employing a connector system according to the present invention; 
           [0013]      FIG. 3  is an exploded partial isometric of the receiving frame, elastomeric connectors and card bottom; 
           [0014]      FIG. 4  is an exploded side section view of the card, frame, elastomeric connectors and PC board of  FIG. 2  showing exemplary alignment elements; 
           [0015]      FIG. 5  is a top isometric view of the frame; and 
           [0016]      FIG. 6  is a bottom isometric view of the frame. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0017]      FIG. 1  demonstrates one embodiment of a miniaturized form factor card  10  employed with a connector system according to the invention. In an exemplary embodiment, the form factor of the card is comparable to a secure digital (SD) card having a substantially rectangular dimensional planform of about 24 by 32 mm with a thickness of about 2-3 mm. The card includes the necessary communications elements for a wireless communications system such as Personal HandyPhone System (PHS), Code Division Multiple Access (CDMA), Global System for Mobile communications (GSM), WiMax, wireless LAN, Digital Video Broadcast—Handheld (DVB-H) or Universal Mobile Telecommunications System (UMTS), including single or multiband. 
         [0018]    Card  10  incorporates a first connector moiety  12  which incorporates a plurality of conductive pads  14 . The pads of the first moiety for the embodiment shown include elongated pads  16  for the RF signal connector elements. The card also incorporates alignment holes  18   a,    18   b  and  18   c  for engagement of mating alignment elements to be described in greater detail subsequently. 
         [0019]    A view of the card positioned for installation and the mounting frame  20  on the printed circuit board  22  of the mobile information device in which the card is to be installed is provided in  FIG. 2 . The connector system according to the present invention provides indexing arrangements for simplified installation such that mobile interface device designers can provide a common platform for multiple systems without custom design of the communication electronics. The installation is accomplished by the end user in certain operational scenarios. Card  10  is received within the frame mounted to PC board in the MID handset. A second connector moiety, which for the embodiment shown is a first elastomeric connector  24  for digital signals and a second elastomeric connector  26  for RF signals, is contained within connector receiving slots  28  and  30  respectively in the frame to receive the mating elements of the first connector moiety. An exemplary elastomeric connector is a STAX™ connector produced by Tyco Electronics. For the digital signals connector, a STAX™ model LD connector is employed in exemplary embodiments. 
         [0020]    The card is installed in the mobile device, for the embodiment of the connector system shown in  FIG. 2 , by insertion vertically within frame  20  which receives the external edges  32  of the card. The connector arrangement and location provides an initial indexing for connection orientation of the card in the frame. Opposing side edges  34  of the frame provide rough alignment of the card within the frame for engagement of the connector moieties. A hinged cover  35  is provided on the frame to secure the entire card within the frame after insertion, urging the connector moieties into firm engagement. As seen in  FIG. 3 , the frame includes mating alignment elements  36   a,    36   b  and  36   c  on an upper surface for the alignment elements on the card provided as holes  18   a,    18   b  and  18   c  previously described which are provided in a bottom plate  11  of the card. These mating alignment elements provide precision alignment of the card in the frame to accurately position the conductive pads in the first connector moiety on the card with the pads in the elastomeric digital and RF connectors. 
         [0021]    Similarly as shown in  FIG. 4 , the frame incorporates a second set of alignment elements  38   a,    38   b  and  38   c  on a lower surface of the frame which engages the PC board. These alignment elements are arranged in a substantially diagonal geometry across the frame to engage mating alignment elements provided by holes  40   a,    40   b  and  40   c  in the PC board as shown in  FIG. 5 . The diagonal arrangement provides the greatest geometric alignment arm for precise alignment of the frame with the board while minimizing the number of alignment elements required. Precision drilling of the holes in the board enhances maintaining the frame squared condition to counter any flexing of the frame. Laser drilling the holes or precision forming as known to those skilled in the art is employed. Precise alignment of the frame on the board creates precise alignment of the connector pads  42  on the board with the elastomeric connector elements carried by the frame. Fabrication of the frame from metal such as aluminum or steel or fiber loaded composite matrix material with about 50% fiber loading creates a reasonably rigid frame. However, the diagonal arrangement of the alignment elements further enhances the rigidity of the frame while assuring that any “unsquare” condition in the frame is corrected by insertion of the alignment pins on the frame into the mating alignment holes on the board. For the embodiments depicted, composite matrix frames are fabricated using PPO as the matrix with carbon or glass fibers. 
         [0022]    As shown in  FIG. 6 , the alignment elements of the card, frame and PC Board provide the precision alignment for the electrically contacting elements of the connector system. Alignment elements  18   a,    18   b  and  18   c  on the card and the mating alignment elements  36   a,    36   b  and  36   c  on the frame align pads  14  and  16  in the connector moiety on the card with the conductive elements  44  in the elastomeric connectors secured within the frame. The frame alignment elements  38   a  (not shown in the section view of  FIG. 6 ),  38   b  and  38   c  then provide alignment of conductive elements  44  in the elastomeric connectors with connector pads  42  on the board through engagement of the mating alignment elements  40   a  (not shown in the section view of  FIG. 6 ),  40   b  and  40   c  in the board. Linear placement of sets of alignment elements, for example elements  36   b,    38   b  arranged in linear opposition as shown in  FIG. 6 , assure that overall alignment from element  18   b  on the card to element  40   b  on the PC board is maintained during thermal expansion or contraction. 
         [0023]      FIG. 7  shows a top view of an exemplary embodiment of the frame with details of the alignment elements for the card shown as pins  36   a,    36   b  and  36   c.  Additionally, alignment protrusions  46  in slot  28  which receives the digital signals elastomeric connector engage the connector for alignment within the slot to further assure placement of the conductors in optimum position for contact with the card and board connector pads. Similarly, alignment protrusion  48  in slot  30  for the RF elastomeric connector orients and aligns the connector for accurate placement of the conductors. Slot  28  provides a tolerance for expansion of the Elastomeric connector when deformed under compression between the card and the PC board. As the Elastomeric connector is compressed vertically, its volume is displaced and expands horizontally within the slot. The protrusions maintain the elastomeric connector in alignment with the pads on the card and the PC board during this related vertical compression and horizontal expansion. 
         [0024]    Having now described the invention in detail as required by the patent statutes, those skilled in the art will recognize modifications and substitutions to the specific embodiments disclosed herein. Such modifications are within the scope and intent of the present invention as defined in the following claims.