CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is a Continuation Application of U.S. application Ser. No. 10/943,902, filed on Sep. 20, 2004, which is a Continuation Application of U.S. application Ser. No. 10/401,988, filed on Mar. 31, 2003, now issued as U.S. Pat. No. 6,795,651, which is a Continuation Application of U.S. application Ser. No. 09/436,750 filed on Nov. 9, 1999, now issued as U.S. Pat. No. 6,539,180, the entire contents of which are herein incorporated by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to camera systems utilizing print on demand printers and in particular discloses a camera with a detachable printer engaged via a PCMCIA slot. 
       BACKGROUND OF THE INVENTION 
       [0003]    It is known for digital cameras to have PC card interfaces of the PCMCIA slot type for Flash memory cards and other forms of digital storage. The Flash cards are typically removed from the camera after being loaded with images and used to transfer those images to a personal computer (PC) or other similar device for printing and possibly for image manipulation. 
         [0004]    There are, however, many advantages in ‘print on demand’ type cameras where the image can be produced from the camera either at the time of taking the photograph or at a later time convenient to the operator. 
         [0005]    The inventor of the present invention has also developed a compact portable printer which is directly engageable with the PCMCIA slot in a lap top or notebook computer and that printer is the subject of a co-pending US patent application claiming priority from Australian Patent Application No. PP7019 having a priority date of 9 Nov., 1998. The present invention enables a printer of this type to be utilized in a further situation by incorporation into a print on demand camera. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention therefore provides a camera device comprising: 
         [0007]    a camera having a lens for viewing images, an image sensor for sensing a said image viewed by the lens, image processing means for processing a said image sensed by the image sensor, and a first PCMCIA interface configured to receive a signal from the image processing means; and 
         [0008]    a printer unit detachably engaged with the camera so that, when so engaged, the printer unit as a whole and the camera as a whole are substantially immovable relative to each other, the printer unit including 
         [0009]    a second PCMCIA interface engaged with the first PCMCIA interface so as to be 
         [0010]    capable of receiving a said signal from the first PCMCIA interface, 
         [0011]    a paper cartridge configured for holding a plurality of individual pages, 
         [0012]    a page-width ink jet printhead, and 
         [0013]    a paper feed configured to feed one page at a time, from the cartridge past the printhead to enable printing, on the page, by the printhead, of an image corresponding to a said signal received by the second PCMCIA interface. 
         [0014]    A further aspect of the invention provides a camera device comprising: 
         [0015]    a camera having a lens for viewing images, an image sensor for sensing a said image viewed by the lens, image processing means for processing a said image sensed by the image sensor, and a first PCMCIA interface configured to receive a signal from the image processing means; and 
         [0016]    a printer unit detachably engaged with the camera so that, when so engaged, the printer unit as a whole and the camera as a whole are substantially immovable relative to each other,
       the printer unit having a second PCMCIA interface engaged with the first PCMCIA interface so as to be capable of receiving a said signal from the first PCMCIA interface,   wherein the printer unit is configured to fit within a space conforming to a space occupied by a type III PCMCIA card.       
 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    Notwithstanding any other forms that may fall within its scope, one preferred form of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: 
           [0020]      FIG. 1  is a perspective view of a detachable printer unit for use in a print on demand camera system according to the invention; 
           [0021]      FIG. 2  is a perspective view of the paper cartridge shown engaged with the printer in  FIG. 1 ; 
           [0022]      FIG. 3  is an exploded perspective view of the printer and cartridge shown in  FIG. 1 ; 
           [0023]      FIG. 4  is a perspective view to an enlarged scale of the printhead and ink reservoir shown in  FIG. 3 ; 
           [0024]      FIG. 5  is a front perspective view of a print on demand camera system according to the invention incorporating the printer shown in  FIG. 1 ; 
           [0025]      FIG. 6  is a rear perspective view of the print on demand camera system shown in  FIG. 5 ; 
           [0026]      FIG. 7  is similar view to  FIG. 5  showing the detachable printer unit removed from the camera unit; 
           [0027]      FIG. 8  is a similar view to  FIG. 7  showing the paper cartridge removed from the detachable printer unit; 
           [0028]      FIG. 9  is a section through the camera system at some depth from the face presented in  FIG. 5 ; 
           [0029]      FIG. 10  is a section through the camera system at right angles to the section of  FIG. 9 ; and 
           [0030]      FIG. 11  is a block diagram showing the operational interconnection of the various components of the camera system according to the invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0031]    The print on demand camera system will firstly be described with reference to the detachable printer unit which is engageable with the camera system. 
         [0032]    In the preferred form of the invention, a small compact printer is provided which is adapted to print on business card sized sheets of paper and which is sized to fit within the constraints of a PCMCIA type III card (the PCMCIA—Personal Computer Memory Card International Association—sets parameters for so called PC cards with a type III card having a typical size of 85.6 mm by 54 mm and a thickness of 10.5 mm). It will, however, be appreciated that a printer made according to the invention can be of a larger size e.g. to print on 6 inch by 4 inch photo sized paper while still incorporating a direct interface with a PCMCIA slot by way of a PCMCIA interface plug as will be described below. 
         [0033]    In the preferred form of the invention the printer unit comprises a support case  1  having a PCMCIA interface plug  2  protruding from one end and a pagewidth ink jet printer  12  extending substantially across the case beneath a cover  3  at the opposite end. 
         [0034]    The printer unit incorporates a docking bay  4  adapted to receive a sheet paper cartridge  5  shown in more detail in  FIGS. 2 and 3 . 
         [0035]    The paper cartridge  5  typically has a metal cover  6  incorporating a pair of integral leaf springs  7  arranged to bear against the top of a paper stack  8 , forcing the paper downwardly (in the sense shown in  FIG. 3 ) to a lower position, where the lowermost sheet in the stack may be fed out beneath a front molding  9 . 
         [0036]    The cartridge is completed by a lower base member  10  and a back molding  11 . 
         [0037]    The pagewidth printer  12  located beneath cover  3  includes a series of ink channel reservoirs such as those shown at  13  and  14  with one reservoir for each ink color in addition to an additional reservoir of large capacity for black ink. The reservoirs are formed around a printhead  30  with feed channels progressively reducing in size, such as those shown at  15 ,  16 ,  17  and  18 , feeding the printhead  30  which is formed by chip manufacturing techniques and incorporates CMOS and MEMS technology similar to that disclosed in Australian provisional patent application No. PP6534 filed on 16 Oct. 1998 entitled ‘Micromechanical device and method (IJ46a)’ assigned to the present applicant and incorporated herein by way of cross reference. 
         [0038]    The printer unit further includes rollers  19 ,  20  arranged to firstly withdraw the lowest sheet from the stack  8  in cartridge  5 , forward the sheet across the printhead  30 , on demand, for printing, and eject the sheet from the printer unit via exit slot  21 . The rollers are driven by an electric motor  22  by way of a gear box  23 . 
         [0039]    The printer unit is controlled by a printer control chip interconnected between the PCMCIA interface  2  and the printer  12  and this may be incorporated within the printhead at  24  or in a flexible printed circuit board beneath the floor of docking bay  4 . 
         [0040]    The electronic circuitry to drive the printhead can also include an ASIC (application specific integrated circuit) device which provides for a one-time use of the printer unit before it must be replaced. This circuit, in the form of an ‘authentication chip’ is preferably similar to that disclosed in international patent application PCT/AU98/00544, also assigned to the present applicant. 
         [0041]    The provision of a detachable paper cartridge  5  as a separate item to the mechanism of the printer  12  allows for ready replenishment of paper supplies. 
         [0042]    The printer unit is engaged into a camera unit to provide a complete camera system as shown in  FIGS. 5 and 6 . The camera unit comprises a camera body  25  defining a socket or housing adapted to receive the printer unit, with the cover  3  and its exit slot  21  protruding from the housing. 
         [0043]    The camera unit further incorporates a lens  26  and a view finder having a front window  27  and an eye piece  28 . A convenient door  29  may be provided for access to the battery or batteries used to power the camera. 
         [0044]    The camera unit includes a ‘shutter’ button  30  and a print button  31  arranged to control operation of the detachable printer unit. 
         [0045]    As described above, the paper cartridge  5  is detachable from the printer unit for replenishment of paper as can be clearly seen in  FIG. 8 . 
         [0046]    The interior of the camera body  25  is provided with a PCMCIA slot  32  ( FIG. 10 ) engageable with the PCMCIA plug  2  on the end of the detachable printer unit. When the printer unit is inserted into the camera body, the plug  2  is engaged in the slot  32  providing the appropriate electrical interconnection between the detachable printer unit and the camera unit. 
         [0047]    The camera unit further incorporates an image sensor typically in the form of a CCD  33  ( FIG. 9 ) located directly behind the lens  26 . The CCD  33  is connected via a flexible PCB  34  to main PCB  35  incorporating image processing means which process the signal from the CCD and transfer it in turn to the PC card slot  32 . 
         [0048]    The camera system is powered by a battery  35  inserted through hinged door  29 . 
         [0049]    Turning to  FIG. 11 , there is illustrated, schematically, the operational portions of the system which are interconnected by means of a communications bus and include the CMOS image sensor (CCD)  37  which captures a high resolution image via the lens of the camera. A processing unit  38  for processing the image and forwarding it to the printer control chip  39  which is located in the detachable printer unit and inturn controls the printhead  40  to produce the image  41 . A memory  42  is utilized for intermediate storage within the camera unit which may also include controls for manipulation of the image before it is transmitted to the printer unit. 
         [0050]    In this manner, a print on demand camera system is provided which enables a detachable and multipurpose printer unit to be used to provide photographic prints as required, while also allowing the printer unit to be utilized for other purposes by engagement with other devices via the PCMCIA interface. 
         [0051]    It will be appreciated by a person skilled in the art that numerous variations and/or modifications may be made to the present invention as shown in the specific embodiment without departing from the spirit or scope of the invention as broadly described. The present embodiment is, therefore, to be considered in all respects to be illustrative and not restrictive.
A compact printer is provided with a static page width printhead. An elongate support case defines a docking bay and has a personal computer (PC) interface connector protruding from one end thereof. A print media cartridge is configured to dock in the docking bay in a releasable manner. A page-width printhead assembly is mounted across an opposite end of the support case to said one end. The printhead assembly includes a static ink ejection printhead configured to eject ink upon print media supplied from the cartridge.