Abstract:
A mobile communication device and a camera module are disclosed herein. In one embodiment, the mobile communication device includes: (1) a main body having attaching means for attaching a camera module, the attaching means comprising means for automatically moving the camera module from the retracted position to the exposed position employing electrical energy and (2) a camera module having complementary attaching means to the main body, such that the camera module is movable with respect to the main body from a retracted position to an exposed position, is wholly detachable from the mobile communication device and is rotatable in the exposed position about at least one axis of rotation.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation of U.S. patent application Ser. No. 11/749,731 filed on May 16, 2008, by Michael J. Chambers, et al., entitled “RETRACTABLE ROTATABLE CAMERA MODULE FOR MOBILE COMMUNICATION DEVICE AND METHOD OF OPERATION THEREOF”, currently allowed which is a continuation-in-part of U.S. patent application Ser. No. 10/825,460, entitled “RETRACTABLE ROTATABLE CAMERA MODULE FOR MOBILE COMMUNICATION DEVICE AND METHOD OF OPERATION THEREOF”, filed on Apr. 15, 2004, by Michael J. Chambers, et al., which is abandoned. The above-listed application is commonly assigned with the present invention and is incorporated herein by reference as if reproduced in its entirety. 
     
    
     TECHNICAL FIELD OF THE INVENTION 
       [0002]    The present invention is directed, in general, to wireless telecommunications and, more specifically, to a retractable rotatable camera module for a mobile communication device and method of operating the same. 
       BACKGROUND OF THE INVENTION 
       [0003]    Mobile communication devices, such as mobile telephones, are increasingly used for more than just speech communication. A variety of applications like messaging services, data communication, e-mail or fax services have become available to the users of mobile communication devices. 
         [0004]    The ongoing development in digital imaging devices makes it possible today to equip mobile communication devices with digital cameras at affordable prices, which gives rise to a host of new multimedia services. Such digital cameras allow one party to take digital photographs and send them to another by means of the well known multimedia message system (MMS) standard. Even video telephony can be established between two mobile communication devices, provided they are each equipped with a camera. The display is integral part of such applications, for viewing functions in the case of digital photography or so each party can see the other in the case of video telephony. 
         [0005]    A problem, which consequently arises is that a different arrangement of display in relation to camera is required to support services such as digital photography and video telephony in the same device. More specifically, they have to face in opposite directions in digital photography, whereas the display and camera have to face in the same direction in video telephony. 
         [0006]    This problem can be solved by equipping the mobile communication device with two cameras, one facing in the same and another facing in the opposite direction of the display. The use of two cameras in a single mobile communication device is taught in, for instance, United States patent application publication US 2003/0036365 to Kuroda, entitled “Portable Communications Terminal with Camera Capable of Taking Pictures.” However, using two cameras leads to a significantly more expensive and complex mobile communication device. 
         [0007]    Accordingly, what is needed in the art is a less expensive way to bring both digital photography and video telephony functionality to a mobile communication device. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention addresses the above-described shortcomings of the prior art by introducing a mobile communication device with imaging means, which can be flexibly used for different applications or services, such as digital photography or video telephony. 
         [0009]    To address the above-discussed deficiencies of the prior art, in one aspect, the present invention provides a mobile communication device. In one embodiment, the mobile communication device includes: (1) a main body having attaching means for attaching a camera module, the attaching means comprising means for automatically moving the camera module from the retracted position to the exposed position employing electrical energy and (2) a camera module having complementary attaching means to the main body, such that the camera module is movable with respect to the main body from a retracted position to an exposed position, is wholly detachable from the mobile communication device and is rotatable in the exposed position about at least one axis of rotation. 
         [0010]    In yet another aspect, the present invention provides a camera module. In one embodiment, the camera module includes: (1) attaching means for attaching the camera module to complementary attaching means of a mobile communication device and (2) a camera, coupled to the attaching means, the camera movable with respect to a main body of the mobile communication device from a retracted position to an exposed position and rotatable in the exposed position about at least one axis of rotation, the attaching means allowing the camera module to be wholly detachable from the mobile communication device. 
         [0011]    The foregoing has outlined, rather broadly, preferred and alternative features of the present invention so that those skilled in the art may better understand the detailed description of the invention that follows. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing or modifying other structures for carrying out the same purposes of the present invention. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the invention in its broadest form. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    For a more complete understanding of the present invention, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which: 
           [0013]      FIG. 1  illustrates a schematic front view of one embodiment of a mobile communication device with a retractable camera module rotatable about one axis of rotation and constructed according to the principles of the present invention; 
           [0014]      FIGS. 2A and 2B  illustrate schematic right-hand side views of the mobile communication device of  FIG. 1  with the camera module in a front side ( FIG. 2A ) and a back side ( FIG. 2B ) position; 
           [0015]      FIG. 3  illustrates an enlarged schematic side view of a second embodiment of a camera module rotatable about two axes of rotation and constructed according to the principles of the present invention; and 
           [0016]      FIG. 4  illustrates a flow diagram of one embodiment of a method of operating a retractable rotatable camera module for a mobile communication device carried out according to the principles of the present invention 
       
    
    
     DETAILED DESCRIPTION 
       [0017]    Referring initially to  FIG. 1 , illustrated is a mobile telephone  100 , which is equipped with a retractable and rotatable camera module  200 . When in use the camera module  200  is in the exposed position shown in  FIG. 1 . When the camera associated with the camera module  200  is not in use, the camera module  200  is retractable into a main body  110  of the mobile telephone  100 . This retracted position is indicated by reference number  210 . 
         [0018]    In this embodiment the camera module  200  comprises a flash  124  and a self-timer (not shown), which is connected to a light-emitting diode (LED)  126  for indicating the elapsing of the delay time of the self-timer. 
         [0019]    The camera module  200  is shown with a lens  122  thereof facing to the front side of the mobile telephone  100 , the front side being defined as the side of the mobile telephone  100  on which a display  112  and a keypad  114  are arranged. This is the typical position suitable for an application such as video conferencing. By rotating the camera module  200  by about 180°, the camera module  200  now faces to the back side of the mobile telephone  100 , which is a suitable position for taking digital photographs. 
         [0020]    The camera module  200  is shown in  FIG. 1  as being mounted at the top side of the mobile telephone  100 . Of course, the camera module  200  could be mounted at the side of the mobile telephone  100  or at any position, in which it can be rotated to face to the front or the back side of the mobile telephone  100  as described above. 
         [0021]    Certainly, the invention is not limited to mobile telephones, but can also be used for personal digital assistants (PDAs) or mobile digital assistants (MDAs) or any other conventional or later-developed mobile communication device. 
         [0022]    Turning now to  FIGS. 2A and 2B , the mobile telephone  100  of  FIG. 1  is shown from the left-hand side to demonstrate further the rotating movement of the camera module  200 . In  FIG. 2A , the camera module  200  is in the front side position. In  FIG. 2B , the camera module  200  is rotated by about 180°, which causes the camera module  200  to face the back side of the mobile telephone  100 . 
         [0023]    Turning now to  FIG. 3 , illustrated is another embodiment of the camera module  200 . In this embodiment, the camera module  200  is rotatable about two axes of rotation, which are essentially perpendicular to one another. That way the camera module  200  can not only be rotated about a vertical axis as shown in  FIGS. 1 ,  2 A and  2 B, but can also be tilted and thus rotated about a horizontal axis of rotation. Positions, in which the camera module is tilted forward and backward are indicated by reference numbers  220  and  230  respectively. 
         [0024]      FIG. 3  also shows, in highly schematic form, an optional spring  310 , by which the camera module  200  can be automatically ejected and brought into the exposed position. For this purpose, an optional user-releasable retainer  320  may be provided to retain the spring in a compressed position until the user releases it. Finally, if the camera module  200  is wholly detachable from the mobile telephone  100  of  FIG. 1 , an attaching means  330  is associated with the camera module  200 . The attaching means  330  releasably engages a corresponding attaching means located on or in the mobile telephone  100 . 
         [0025]    Turning now to  FIG. 4 , illustrated is a flow diagram of one embodiment of a method of operating a retractable rotatable camera module for a mobile communication device carried out according to the principles of the present invention. The method begins in a start step  410  when a user wishes to deploy a camera either to take a digital photograph or engage in video telephony. 
         [0026]    The method proceeds to a step  420  in which a user deploys a camera module containing the camera by releasing a user-releasable retainer. In response, a spring extends, causing a camera module to move from a retracted position to an exposed position with respect to the main body of the mobile communication device. 
         [0027]    Next, in a step  430 , the user rotates the camera module about at least one axis of rotation. Then, in an optional step  440 , a detector, in particular an electronic detector, detects the position of the camera module relative to the main body of the mobile communication device, including perhaps the rotational orientation of the camera module. The power supply of the camera module may then be automatically switched on. Detection of the position could also be accomplished via a magnetic switch, electrical resistance, etc. 
         [0028]    In a step  450 , the mobile communication device automatically initiates a particular application based on the detected position of the camera module. The particular application may be for digital photography or for video telephony. For example, depending on the detected rotation angle of the camera module, the mobile communication device launches either a video telephone application or a view finder application. If the lens of the camera module is “looking” into the direction of the user, a front side position, the video telephone application is started. If the lens of the camera module is detected in a back side position, away from the keypad and display of the mobile communication device, the view finder, or digital photography application, is started. 
         [0029]    In addition to the front side and back side positions, particular applications may be automatically initiated based on detected positions of the camera module therebetween. The applications that are initiated and the detected positions that initiate the applications can be programmed by the user. Configuration data associated with the different applications can be predetermined and stored in the memory of the mobile communication device. Functions associated with the different applications may also be stored in the memory and activated by the different applications. For example, considering the position towards the user, the front position, is angle 0°. At the 0° angle, a video telephony application is initiated. As such, the camera module can be automatically setup for the proper brightness and contrast associated with video telephony. The proper brightness and contrast may be predetermined and stored in a memory of the mobile communication device. In addition to configuring the camera module, a video call to a pre-programmed target may be initiated by the video telephony application. 
         [0030]    If the back side position, 180° angle, is detected, the digital photography application may be automatically initiated. As such, the camera module can be configured for highest quality pictures. Configuration data for the digital photography can be predetermined and stored in the memory of the mobile communication device. 
         [0031]    If a position between the front side and back side is detected, such as at an angle of 90°, a video recorder application can be automatically initiated. For example, after turning the camera module into 90° position, video recording may automatically start and no extra shutter release is required for the camera module. Additionally, functions may be automatically assigned by the video recorder application. For example, functions may be assigned to the keypad such that stopping, starting, restarting, etc., is possible via employing the keypad. Voice commands may also be activated and employable. 
         [0032]    If an angle of 270° is detected, a still image application may be initiated. The still image application can include different settings for the camera module compared to the digital photography application. For example, the resolution may be higher or the shutter speed may be slower. 
         [0033]    The automatic initiation of applications based on a detected position may differ depending on the current status of the mobile communication device. For example, if a video call is in progress and the camera module is turned away from the front position, the video call can remain ongoing. Nevertheless, in some embodiments, pushing the camera module back into the camera body may terminate a video call. 
         [0034]    The method  400  then proceeds to configuring a display of the mobile communication device based on the detected position in a step  460 . If a front side position is detected, the display can be configured for a predetermined pixel resolution for video telephony. Additionally, if a back side position is detected, the display may be configured for a different pixel resolution for digital photography. The various parameters for configuring the display per the associated applications may be stored in the memory of the mobile communications device. 
         [0035]    Next, in an optional step  470 , a flash may be activated if the user intends to take a digital photograph. A self-timer may be used to measure a delay time before automatically taking a photograph. The elapsing of the delay time can be indicated by appropriate indicator, such as an LED, which may flash with an ascending frequency during the delay time. The method ends in an end step  480 , when the user ostensibly urges the camera module back into a retracted position within the main body. 
         [0036]    Although the present invention has been described in detail, those skilled in the art should understand that they can make various changes, substitutions and alterations herein without departing from the spirit and scope of the invention in its broadest form.