Patent Publication Number: US-7917087-B2

Title: Wireless communication system and image forming device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a wireless communication system which can be applied to various types of devices in which plural cartridge parts can be removably loaded in a device main body, and to an image forming device (such as a copier, a facsimile machine, a printer or the like) in which plural cartridge parts can be removably loaded in a device main body. 
     2. Description of the Related Art 
     Among image forming devices using an electrophotographic process such as a copier, a laser printer or the like, there are image forming devices in which the container which houses toner is structured as a toner cartridge in order to facilitate maintenance of the device. In such an image forming device, when all of the toner has been discharged from the interior of the toner cartridge, the user replaces the toner cartridge with a new one so as to replenish the toner. At this time, in most cases, the used toner cartridge which has been removed from the image forming device is returned by the user to the manufacturer of the image forming device. After undergoing recycling processes by the manufacturer such as inspection, cleaning, replacement of worn-out parts, refilling of toner and the like, the toner cartridge is again shipped to the user. When such an image forming device can form color images, respectively different types of toner cartridges (e.g., four types corresponding to black, cyan, magenta, and yellow) are loaded in cartridge loading sections provided at different regions in the device main body. Toners of respectively different colors are supplied from these toner cartridges to the device main body. 
     Moreover, among such image forming devices, there are those in which a developing device, a cleaning device, a charging device and the like are provided as process parts relating to the image creating process (the developing device adheres toner to a electrophotographic photosensitive body (hereinafter simply called “photosensitive body”); the cleaning device recovers the residual toner after transfer of a toner image from the photosensitive body has been completed; and the charging device charges the image carrying surface of the photosensitive body to a predetermined electric potential), and which are equipped with a process cartridge in which at least one of these process parts is supported integrally with the photosensitive body. The process cartridge is replaced with a new one when the life of any of the structural parts thereof has elapsed. In most cases, the process cartridge which has been removed from the image forming device is returned from the user to the manufacturer, and after undergoing recycling processes by the manufacturer such as inspection, cleaning, replacement of parts whose life has elapsed, and the like, is again shipped to the user who uses the image forming device. 
     In recent years, such image forming devices have been used in which a tag (a wireless communication tag) having a radio wave communication function and an information storage function is attached to each of the cartridge parts (such as a toner cartridge, a process cartridge, or the like), and a wireless communication device, which is for carrying out input and output of information between the wireless communication tags and the device main body, is provided at the device main body. In such an image forming device, when a cartridge part is loaded in the device main body, the control section of the main body reads information stored on the cartridge tag or writes information onto the cartridge tag, by radio wave communication between the wireless communication device and the cartridge tag. In this way, for example, due to the control section of the main body reading, from the cartridge tag, information corresponding to the type of cartridge part, if a cartridge part which is a different type than the type which should actually be loaded is mistakenly loaded into a predetermined loading section of the device main body, it can be judged that the cartridge part has been mistakenly loaded, and the needed control (error processing or the like) can be carried out. Further, if the control section of the main body is structured so as to write the usage history of the cartridge part, which is based on the number of times image formation has been carried out or the like, onto the wireless communication tag, the manufacturer or the like can read the information relating to the usage history from the wireless communication tag of the cartridge part which has been returned from the user. In this way, the manufacturer or the like can efficiently and accurately carry out inspection work or parts replacement work in the process of recycling the cartridge part. 
     Among such wireless communication tags mounted to cartridge parts, there are those to which electric power consumed at the time of operation (such as wireless communication, information processing or the like) is supplied by electromagnetic induction from the wireless communication device of the device main body. In this way, there is no need for a power source such as a battery or the like to be provided at the wireless communication tag. This is advantageous from the standpoints of making the wireless communication tag more compact and keeping the cost thereof low. 
     For example, Japanese Patent Application Laid-Open (JP-A) No. 2001-22230 discloses an image forming device equipped with such wireless communication tags to which electric power is supplied by electromagnetic induction. In this image forming device, a wireless communication tag is attached to each of a process cartridge and a developing cartridge (which is a developing device which has been made into a cartridge part), and a wireless communication device is provided at the device main body. 
     Here, a main body antenna and tag antennas, which are each formed by winding a thin metal film into a coil form, are provided at the wireless communication device and the wireless communication tags respectively. In this wireless communication system formed from the wireless communication tags and the wireless communication device, the supply of electric power to the wireless communication tags is carried out by electromagnetic induction. In order to reliably carry out radio wave communication by using the weak electric power supplied to the wireless communication tags by electromagnetic induction, the main body antenna of the wireless communication device and the tag antenna of the wireless communication tag oppose one another in a state of being substantially parallel to one another, or in a state of being slightly inclined with respect to the other. Further, there is the need to make the interval between the main body antenna and the tag antenna of the wireless communication tag sufficiently small. 
     In an image forming device which can form color images, a wireless communication tag is provided at each of the plural types of toner cartridges. In a case in which an attempt is made to carry out radio wave communication between these wireless communication tags and the wireless communication device of the device main body, it has been thought to place the plural toner cartridges symmetrically with respect to the main body antennas in order to reduce the number of places at which the main body antennas are to be provided. In such a case, in order to set the plural tag antennas in the aforementioned positional relationship with respect to the main body antennas, usually, the wireless communication tags must be provided at respectively different regions at the plural types of toner cartridges. Accordingly, in plural types (e.g., four types) of toner cartridges loaded in an image forming device which can form color images, the attaching portions for the wireless communication tags (tag attaching portions) must be made to have a different shape and a different structure for each type of toner cartridge, and it is difficult to use a common configuration and structure for the tag attaching portions. In addition, using a common configuration and structure is desirable from the standpoints of reducing the manufacturing costs of the toner cartridges, facilitating recycling, and the like. 
     SUMMARY OF THE INVENTION 
     In view of the aforementioned, an object of the present invention is to provide a wireless communication system in which a common structure and configuration are used for tag attaching portions at cartridge parts which are loaded into respectively different cartridge loading portions, and in which it is easy to adjust the positions of the wireless communication tags at the cartridge parts to positions which are suited for communication with respect to main body antennas, and to provide an image forming device to which this wireless communication system is applied. 
     In order to achieve the above-described object, in accordance with a first aspect of the present invention, there is provided a wireless communication system applicable to a device having a device main body, a plurality of cartridge loading portions provided at the device main body, and a plurality of cartridge parts removably loadable in the cartridge loading portions, the wireless communication system comprising: (a) a wireless communication tag provided at each cartridge part, the wireless communication tag having a tag antenna, a tag wireless control section carrying out transmission and/or receipt of information in a non-contact manner via the tag antenna, and an information storing element at which reading and/or writing of information are carried out by the tag wireless control section; (b) a plurality of main body antennas provided at regions of the device main body which regions correspond to the cartridge loading portions respectively; (c) a main body wireless control section provided at the device main body, and carrying out transmission and/or receipt of information in a non-contact manner with respect to one corresponding tag wireless control section via one main body antenna and one corresponding tag antenna; and (d) a tag attaching portion for attachment of the wireless communication tag, and provided at one or more places of each cartridge part. 
     In accordance with another aspect of the present invention, there is provided an image forming device comprising: (I) a device main body including an image forming section; (II) a plurality of cartridge loading portions provided at the device main body; (III) a plurality of cartridge parts removably loadable in the cartridge loading portions; and (IV) a wireless communication system having: (a) a wireless communication tag provided at each cartridge part, the wireless communication tag having a tag antenna, a tag wireless control section carrying out transmission and/or receipt of information in a non-contact manner via the tag antenna, and an information storing element at which reading and/or writing of information are carried out by the tag wireless control section; (b) a plurality of main body antennas provided at regions of the device main body which regions correspond to the cartridge loading portions respectively; (c) a main body wireless control section provided at the device main body, and carrying out transmission and/or receipt of information in a non-contact manner with respect to one corresponding tag wireless control section via one main body antenna and one corresponding tag antenna; and (d) a tag attaching portion for attachment of the wireless communication tag, and provided at one or more places of each cartridge part. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view showing the structure of a laser printer relating to an embodiment of the present invention. 
         FIG. 2  is a perspective view showing the structure of a cartridge holder in which toner cartridges are removably loaded, in the laser printer shown in  FIG. 1 . 
         FIG. 3  is a perspective view showing the structure of the toner cartridges and antenna units of a wireless communication device, in the laser printer shown in  FIG. 1 . 
         FIG. 4  is an exploded perspective view showing the structure of the toner cartridge and a wireless communication tag attached to the toner cartridge, in the laser printer shown in  FIG. 1 . 
         FIG. 5  is a front view, as seen from an axial direction outer side, of the wireless communication tags attached to the toner cartridges and the antenna unit of the wireless communication device, in the laser printer shown in  FIG. 1 . 
         FIG. 6  is a side sectional view showing the structure of the wireless communication tags attached to the toner cartridges and the antenna unit of the wireless communication device, in the laser printer shown in  FIG. 1 . 
         FIG. 7  is a side view showing an example of the toner cartridge in a wireless communication system relating to the embodiment of the present invention, and shows a state before a closing cover has been attached to a tubular body. 
         FIG. 8  is a side view showing an example of the toner cartridge in the wireless communication system relating to the embodiment of the present invention, and shows a state in which the closing cover has been attached to the tubular body. 
         FIG. 9  is a side view showing an example of the toner cartridge in the wireless communication system relating to the embodiment of the present invention, and shows a state in which a sliding cover has been slid to a standby position. 
         FIG. 10  is a side view showing an example of the toner cartridge in the wireless communication system relating to the embodiment of the present invention, and shows a state in which an opening/closing shutter has been slid to an open position. 
         FIG. 11  is a block diagram showing the structure of the wireless communication system in the laser printer relating to the embodiment of the present invention. 
         FIG. 12  is a perspective view showing a first modified example of a toner cartridge in the wireless communication system relating to the embodiment of the present invention. 
         FIG. 13  is a perspective view showing a second modified example of a toner cartridge in the wireless communication system relating to the embodiment of the present invention. 
         FIG. 14  is a sectional view showing a tag accommodating portion and a wireless communication tag in the toner cartridge shown in  FIG. 13 . 
         FIG. 15  is a flowchart showing operations at the time of communication starting processing by the wireless communication system relating to the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, a laser printer relating to an embodiment of the present invention, and a wireless communication system in the laser printer will be described with reference to the drawings. 
     (Structure of Laser Printer) 
     A laser printer  10 , which is equipped with a wireless communication system relating to an embodiment of the present invention, is shown in  FIG. 1 . By a known electrophotographic process, this laser printer  10  forms an image (a toner image) on the basis of image information inputted from an external device, and records the image on a recording paper or the like. The electrophotographic process is the series of processes of charging an electrophotographic photosensitive body, forming an electrostatic latent image by laser exposure, transferring a toner image, which is formed on the electrophotographic photosensitive body by developing the electrostatic latent image by toners, onto a recording material, and heating and fixing the toner image, so as to record an image on the recording material. Among the processes of the electrophotographic process and the various parts (process parts), such as the electrophotographic photosensitive body and the like, which are directly related to the electrophotographic process, those which are not directly related to the essence of the present invention will not be discussed in great detail. Note that the laser printer  10  relating to the present embodiment can form a color image by using magenta (M), yellow (Y), black (K) and cyan (C) toners. 
     A case  12  is provided at the laser printer  10  as the outer covering portion of the device. A main frame  14 , which is for supporting the respective parts which form the device, is provided within the case  12 . A process unit  16  is disposed at one end portion (the left end portion in  FIG. 1 ) along the widthwise direction of the device (the direction of arrow W) in the main frame  14 . A sliding frame  18 , which is supported by the main frame  14  so as to be slidable along the depthwise direction of the device, is provided at the process unit  16 . Predetermined process parts (not illustrated), such as an intermediate transfer belt, a transfer device, a cleaning device, and the like are provided at the sliding frame  18 . In this way, when maintenance is carried out, the process unit  16  is pulled-out to the exterior from the main frame  14 , so as to simplify the exchange work, the inspection work, and the like of the process parts set at the sliding frame  18 . 
     Four photosensitive drums  20 ,  22 ,  24 ,  26  are supported at the main frame  14  so as to be adjacent to the process unit  16 . Four developing devices  21 ,  23 ,  25 ,  27  are disposed in the main frame  14  so as to be adjacent to the photosensitive drums  20 ,  22 ,  24 ,  26 , respectively. The four developing devices  21 ,  23 ,  25 ,  27  correspond to toners of magenta (M), yellow (Y), black (K) and cyan (C), respectively, and develop the electrostatic latent images formed on the outer peripheral surfaces (the image carrying surfaces) of the photosensitive drums  20 ,  22 ,  24 ,  26  as respective toner images by M toner, Y toner, K toner and C toner. 
     The toner images formed on the four photosensitive drums  20 ,  22 ,  24 ,  26  are transferred onto the intermediate transfer belt provided at the process unit  16  such that they are superposed on one another, so as to form a full-color toner image. After the full-color toner image is transferred from the intermediate transfer belt onto a recording material such as a recording paper or the like, the full-color toner image is heated and fixed, so as to be recorded on the recording material. At the laser printer  10 , it is also possible to record a monochromatic toner image, which is formed only by K toner, on a recording material. The recording material on which the toner image is recorded is conveyed along a predetermined conveying path (not shown), and is discharged onto a discharged paper tray portion  28  formed on the top surface of the case  12 , or is discharged onto discharged paper trays  30 ,  32  attached to a side surface of the case  12  so as to extend out toward the side. 
     A cartridge holder  34  is provided at the laser printer  10 , adjacent to the main frame  14  along the widthwise direction. As shown in  FIG. 2 , four toner cartridges  36 ,  38 ,  40 ,  42 , each of which is formed in a substantially cylindrical shape, are removably loaded in the cartridge holder  34 . Toners of different colors (a magenta (M) toner, a yellow (Y) toner, a black (K) toner, and a cyan (C) toner) are filled in the toner cartridges  36 ,  38 ,  40 ,  42 , respectively. 
     As shown in  FIG. 1 , an opening/closing door  13  for maintenance is provided at the case  12  so as to oppose the process unit  16  and the cartridge holder  34  at one side surface of the case  12  (the side surface which is toward the front in the direction orthogonal to the surface of the drawing of  FIG. 1 ). In this way, by a user or the like opening the opening/closing door  13  and exposing the process unit  16  and the cartridge holder  34  to the exterior, the process unit  16  can be pulled out from the main frame  14  to the exterior, and the toner cartridges  36 ,  38 ,  40 ,  42  can respectively be attached to and removed from the cartridge holder  34 . 
     The toner cartridges  36 ,  38 ,  40 ,  42  which are loaded in the cartridge holder  34  are formed as containers for temporarily housing the toners. Namely, at the laser printer  10 , when the developing devices  21 ,  23 ,  25 ,  27  are operating, the toners are discharged from the toner cartridges  36 ,  38 ,  40 ,  42 , and the toners are supplied to the developing devices  21 ,  23 ,  25 ,  27 . When all of the usable toner filled within the toner cartridges  36 ,  38 ,  40 ,  42  is discharged, the toner cartridges  36 ,  38 ,  40 ,  42  are replaced with new ones. At this time, because the toners are sealed within the toner cartridges  36 ,  38 ,  40 ,  42 , the replenishing of toner to the laser printer  10  is carried out by a simple operation, and it is possible to effectively prevent dirtying of the interior and the exterior of the device due to toner scattering at the time when the toners are replenished. 
     As shown in  FIG. 2 , each of the toner cartridges  36 ,  38 ,  40 ,  42  has a tubular body  44  which is formed as a thin-walled cylindrical tube of a resin material. An opening/closing port  49  (see  FIG. 7 ) which communicates with the interior is provided at one end surface along the axial direction of the tubular body  44  (the rear end surface). The opening/closing port  49  of the tubular body  44  is closed by a closing cover  46  which is formed of resin and is formed in a tubular shape. A taper portion  46 A (see  FIG. 7 ), whose diameter narrows toward the distal end, is formed at one end portion of the closing cover  46 . This taper portion  46 A is press-fit through the opening/closing port  49  into the tubular body  44 . The inner peripheral side of the closing cover  46  is closed by a disc-shaped bottom plate portion  47  (see  FIG. 2 ). A plate-shaped handle portion  48  is molded integrally within the closing cover  46 , at the outer side of the bottom plate portion  47 . 
     As shown in  FIG. 3  and  FIG. 4 , an inner peripheral tube portion  50 , whose cross-sectional configuration is substantially rectangular, is provided integrally at the inner peripheral side of the peripheral wall portion of the distal end portion (or front end portion) of the tubular body  44 . A disc-shaped driven connecting plate  52  is set, so as to be rotatable around an axial center S of the tubular body  44 , at the bottom plate portion of the inner peripheral tube portion  50 . A plurality of meshing claws  53  are formed integrally along the peripheral direction at the front surface side of the driven connecting plate  52 . On the other hand, a screw feeder (not shown) for conveying toner, which is formed in the shape of a screw shaft, is rotatably supported coaxially within the tubular body  44 . The screw feeder is connected to the driven connecting plate  52 , and rotates integrally with the driven connecting plate  52 . 
     As shown in  FIG. 4 , a toner supplying port  54  and a toner filling port  55  are formed at the distal end side of the tubular body  44  in the peripheral wall portion thereof. As shown in  FIGS. 9 and 10 , a plate-shaped shutter member  56 , which is slidable along the peripheral direction, is disposed at the outer peripheral side of the toner supplying port  54 . The shutter member  56  is slidable between a closed position (see  FIG. 9 ) at which the shutter member  56  closes the toner supplying port  54 , and an open position (see  FIG. 10 ) at which the shutter member  56  opens the toner supplying port  54 . The shutter member  56  is always urged toward the closing position by an urging member (not shown) such as a coil spring or the like. In this way, in the state in which the toner cartridges  36 ,  38 ,  40 ,  42  are loaded in the cartridge holder  34 , the shutter members  56  are held at the closed positions. Further, a cap member  58  is fixed to the outer peripheral side of the toner filling port  55  at the peripheral wall portion of the tubular body  44 , so as to close the toner filling port  55 . 
     Further, as shown in  FIGS. 8 and 9 , a sliding cover  57 , which is thin-walled and tubular, is disposed so as to be slidable along the axial direction at the outer peripheral side of the distal end portion of the tubular body  44 . The sliding cover  57  is slidable between a covering position (see  FIG. 8 ) at which the sliding cover  57  covers the shutter member  56  and the cap member  58  from the outer peripheral side, and a standby position (see  FIG. 9 ) at which the sliding cover  57  is slid toward the closing cover  46  side with respect to the shutter member  56  and the cap member  58 . The sliding cover  57  is always urged toward the covering position by an urging member (not shown) such as a coil spring or the like. In this way, in the state in which the toner cartridges  36 ,  38 ,  40 ,  42  are not loaded in the cartridge holder  34 , the sliding covers  57  are held at the covering positions. Note that in the drawings other than  FIGS. 3 ,  7 ,  8 ,  9  and  10 , in order to simplify explanation, the toner cartridges  36 ,  38 ,  40 ,  42  are illustrated with the sliding covers  57  omitted. 
     As shown in  FIG. 4 , four partitioning plates  60 ,  61 ,  62 ,  63  are formed in rib-shapes at the rear end portion of the tubular body  44 , so as to connect the peripheral wall portion of the tubular body  44  and the inner peripheral tube portion  50 , within the space formed between the inner peripheral surface of the peripheral wall portion of the tubular body  44  and the outer peripheral surface of the inner peripheral tube portion  50 . The partitioning plates  60 ,  61 ,  62 ,  63  partition the ring-like space, which is formed between the peripheral wall portion of the tubular body  44  and the inner peripheral tube portion  50 , into small spaces along the peripheral direction. These small spaces open toward the distal end surface of the tubular body  44 , and the rear end sides thereof are closed by the bottom plate portion  45  of the tubular body  44 . 
     Here, the small space between the partitioning plate  60  and the partitioning plate  61  within the tubular body  44 , and the small space between the partitioning plate  61  and the partitioning plate  62  are formed as accommodating chambers  64 ,  66  for each accommodating one wireless communication tag  72  (see  FIG. 4 ) which will be described later. Moreover, the small space between the partitioning plate  60  and the partitioning plate  63  also is formed as an accommodating chamber  68  which accommodates one wireless communication tag  72 . However, as shown in  FIG. 5 , the accommodating chamber  68  is functionally divided, with a vicinity of an edge portion  50 A of the inner peripheral tube portion  50  serving as the boundary, into an accommodating portion  68 A and an accommodating portion  68 B. In the accommodating chamber  68 , the wireless communication tag  72  can be selectively accommodated in either of the two accommodating portions  68 A,  68 B. Accordingly, one wireless communication tag  72  is selectively accommodated in any one of the accommodating chamber  64 , the accommodating chamber  66  and the two accommodating portions  68 A,  68 B of the accommodating chamber  68 . The position of attachment varies along the peripheral direction in accordance with the selected accommodating chamber  64 ,  66  or accommodating portion  68 A,  68 B. 
     As shown in  FIG. 4 , the wireless communication tag  72  is formed such that the projected configuration thereof, as seen from the axial direction, is a substantial fan shape which corresponds to the accommodating chambers  64 ,  66 . By inserting and fitting the wireless communication tag  72  into any of the accommodating chamber  64 , the accommodating chamber  66  or the accommodating portions  68 A,  68 B of the accommodating chamber  68 , the wireless communication tag  72  is accommodated and held at the interior of the accommodating chamber  64 ,  66  or the accommodating portion  68 A,  68 B. A pair of anchor claws  74 , which project toward the outer peripheral side, are formed at the wireless communication tag  72  at the outer peripheral surface of the insertion side end portion thereof. An engaging projection  76  is formed at the entrance side end surface portion of the wireless communication tag  72  so as to project toward the axial center S. On the other hand, anchor holes  78 , which correspond to the anchor claws  74  of the wireless communication tag  72 , are formed at the peripheral wall portion of the tubular body  44  at each of the accommodating chambers  64 ,  66  and the accommodating portions  68 A,  68 B. A notch-shaped engaging concave portion  80 , which corresponds to the engaging projection  76  of the wireless communication tag  72 , is formed at the rear end surface of the inner peripheral tube portion  50  at each of the accommodating chambers  64 ,  66  and the accommodating portions  68 A,  68 B. 
     Accordingly, when the wireless communication tag  72  is inserted in and fit into any of the accommodating chambers  64 ,  66  or accommodating portions  68 A,  68 B, the outer peripheral surface of the wireless communication tag  72  is in a state of being fit tightly against the inner peripheral surface of the tubular body  44 . The pair of anchor claws  74  are inserted into the pair of anchor holes  78 , and the engaging projection  76  is engaged with the engaging concave portion  80 . In this way, movement of the wireless communication tag  72  along the axial direction is reliably restricted, and due to the engaging projection  76  engaging with the engaging concave portion  80 , joggling along the peripheral direction also is prevented. The wireless communication tag  72  which has been inserted and fit in the accommodating chamber  64 ,  66  or  68  is removed from the tubular body  44  by being pulled outwardly while the pair of anchor claws  74  are elastically deformed toward the inner peripheral side by a tool exclusively used for this purpose or the like. 
     As shown in  FIG. 4 , a tag antenna  82 , which is formed by winding an electrically conductive wire material such as a copper wire or the like into the form of a coil, is provided within the wireless communication tag  72 . A coil axis TC of the tag antenna  82 , which is the center of the winding of the electrically conductive wire material, is provided so as to be substantially parallel to the direction of thickness of the wireless communication tag  72 . The configuration of the coil surface along the direction perpendicular to the axis curves along the outer peripheral surface of the wireless communication tag  72 . Specifically, as shown in  FIGS. 5 and 6 , an outer wall portion  84  and an inner wall portion  86 , which are curved parallel to one another, are provided at the wireless communication tag  72 . A core portion  88  is connected between the outer wall portion  84  and the inner wall portion  86 . Due to an electrically conductive wire material being wound around the outer peripheral side of the core portion  88 , the tag antenna  82 , which is flat along the axial direction, is curved along the outer peripheral surface of the wireless communication tag  72 . 
     A partitioned chamber portion  90 , which is closed to the exterior, is provided at the inner peripheral side of the tag antenna  82  at the wireless communication tag  72 . A circuit board  92  is accommodated in the partitioned chamber portion  90 . An IC chip  94 , at which the control circuits of the wireless communication tag  72  are integrated as one chip, is packaged on the circuit board  92 . The IC chip  94  is electrically connected to the tag antenna  82  via the circuit board  92  or the like. 
     As shown in  FIG. 2 , at the cartridge holder  34  which is provided at the device main body, two cartridge loading portions  96 ,  98  are disposed at the topmost level, one cartridge loading portion  100  is disposed at the middle level, and one cartridge loading portion  102  is disposed at the bottommost level, along the heightwise direction of the device (the direction of arrow H). The toner cartridges  36 ,  38 ,  40 ,  42  are detachably loaded into these cartridge loading portions  96 ,  98 ,  100 ,  102 , respectively. Here, the four toner cartridges  36 ,  38 ,  40 ,  42  which are loaded in the cartridge holder  34  are arranged in a backward L-shape as seen from the axial direction outer sides thereof. In this way, as compared with a case in which the four toner cartridges  36 ,  38 ,  40 ,  42  are arranged rectilinearly along the heightwise direction, it is possible to suppress an increase in the dimension along the heightwise direction of the device. 
     As shown in  FIG. 2 , four driving units  108  are provided at the cartridge holder  34  at the end portion at the back side of the device, so as to correspond to the respective loading positions of the four toner cartridges  36 ,  38 ,  40 ,  42 . (Note that only the two driving units  108  at the uppermost level are illustrated in  FIG. 2 .) The outer configuration of each driving unit  108  is thick-plate-shaped, and the driving units  108  are supported such that the directions of thickness thereof coincide with the depthwise direction of the device. Driving connecting plates (not shown), which corresposnd to the driven connecting plates  52  (see  FIG. 4 ) of the toner cartridges  36 ,  38 ,  40 ,  42 , are rotatably disposed at the front surface portions of the driving units  108 , which front surface portions oppose the distal end surfaces of the toner cartridges  36 ,  38 ,  40 ,  42 . The driving connecting plates basically have shapes which are symmetrical to the driven connecting plates  52 , and can mesh with the driven connecting plates  52 . A driving motor (not shown) is housed within each driving unit  108 . These driving motors rotate so as to rotate the driving connecting plates at times when the developing devices  21 ,  23 ,  25 ,  27  are operated. 
     As shown in  FIG. 2 , a supporting plate  104 , which extends in a backwards L shape so as to enclose the four toner cartridges  36 ,  38 ,  40 ,  42 , is provided at the device front side end portion of the cartridge holder  34 . Four supporting brackets  106  are connected and fixed to the supporting plate  104  so as to correspond to the positions where the four toner cartridges  36 ,  38 ,  40 ,  42  are loaded. In the state in which the four toner cartridges  36 ,  38 ,  40 ,  42  are loaded at the cartridge holder  34 , the toner cartridges  36 ,  38 ,  40 ,  42  span between the driving units  108  and the supporting brackets  106 , and the distal end portions and rear end portions of the toner cartridges  36 ,  38 ,  40 ,  42  are supported by the driving units  108  and the supporting brackets  106 . Shutter engaging portions and cover engaging portions (neither of which is illustrated), which can engage with the shutter members  56  and the sliding covers  57  of the toner cartridges  36 ,  38 ,  40 ,  42 , are provided at the supporting brackets  106 . 
     As shown in  FIG. 2 , at each of the cartridge loading portions  96 ,  98 ,  100 ,  102  of the cartridge holder  34 , two guide members  110 ,  112  span between the driving unit  108  and the supporting bracket  106  so as to extend along the depthwise direction. When the toner cartridges  36 ,  38 ,  40 ,  42  are to be inserted into and removed from the cartridge holder  34 , they are guided by the guide members  110 ,  112  so as to move rectilinearly along the depthwise direction. 
     At the laser printer  10 , when the toner cartridges  36 ,  38 ,  40 ,  42  are to be loaded into the corresponding cartridge loading portions  96 ,  98 ,  100 ,  102  at the cartridge holder  34 , first, the toner cartridges  36 ,  38 ,  40 ,  42  are inserted along the depthwise direction toward the rear of the device, and the distal ends of the toner cartridges  36 ,  38 ,  40 ,  42  abut the driving units  108 . In this way, the distal end portions of the toner cartridges  36 ,  38 ,  40 ,  42  are connected to the driving units  108 , and the shutter engaging portions of the supporting brackets  106  engage with the shutter members  56  of the toner cartridges  36 ,  38 ,  40 ,  42 . Interlockingly with this operation of inserting the toner cartridges  36 ,  38 ,  40 ,  42  into the cartridge holder  34 , the cover engaging portions of the supporting brackets  106  engage with the sliding covers  57  and slide the sliding covers  57  from their covering positions to their standby positions. 
     Next, by using the handle portions  48  to rotate the toner cartridges  36 ,  38 ,  40 ,  42  clockwise by a predetermined angle, the loading of the toner cartridges  36 ,  38 ,  40 ,  42  into the cartridge loading portions  96 ,  98 ,  100 ,  102  is completed. At this time, the driving connecting plates disposed at the driving units  108  mesh with the driven connecting plates  52  of the toner cartridges  36 ,  38 ,  40 ,  42 . The driving motors housed within the driving units  108  are connected so as to be able to transmit torque to the screw feeders within the toner cartridges  36 ,  38 ,  40 ,  42 , via the driving connecting plates and the driven connecting plates  52 . Interlockingly with the rotation of the toner cartridges  36 ,  38 ,  40 ,  42  at the cartridge loading portions  96 ,  98 ,  100 ,  102 , the shutter engaging portions of the supporting brackets  106  engage with the shutter members  56  and slide the shutter members  56  from their closed positions to their open positions. In this way, the toner supplying ports  54  are opened, and the toners filled in the toner cartridges  36 ,  38 ,  40 ,  42  can be discharged through the toner supplying ports  54 . 
     As shown in  FIG. 2 , at the laser printer  10 , toner feeding tubes  114  are disposed between the developing devices  21 ,  23 ,  25 ,  27  and the cartridge loading portions  96 ,  98 ,  100 ,  102  of the cartridge holder  34 . One end portions of the toner feeding tubes  114  are connected to the supporting brackets  106 . When the toner cartridges  36 ,  38 ,  40 ,  42  are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 , the one end portions of the toner feeding tubes  114  are connected to the toner supplying ports  54  of the toner cartridges  36 ,  38 ,  40 ,  42  via the supporting brackets  106 . Screw feeders for conveying toner (not shown) are disposed within the toner feeding tubes  114 . Torque from driving motors within the driving units  108  is transmitted to these screw feeders via torque transmitting shafts  116  and the like. 
     At the laser printer  10 , when the developing devices  21 ,  23 ,  25 ,  27  are operated, the driving motors housed within the driving units  108  corresponding to the developing devices  21 ,  23 ,  25 ,  27  which are being operated are rotated. In this way, at the toner cartridges  36 ,  38 ,  40 ,  42 , the toners are discharged at a predetermined speed from the toner supplying ports  54  by the operation of the screw feeders, and the toners are supplied through the toner feeding tubes  114  to the developing devices  21 ,  23 ,  25 ,  27  which are in an operating state. At this time, the amounts of toner supplied to the developing devices  21 ,  23 ,  25 ,  27  are controlled so as to be substantially equal to the amounts of toner which are consumed for developing. 
     As shown in  FIG. 3 , at the cartridge holder  34 , plate-shaped antenna units  118 ,  120  are disposed at the device rear side between the cartridge loading portions  96 ,  98  and at the device rear side between the cartridge loading portions  100 ,  102 , respectively. Casing portions  122 , which are formed in thin-walled plate shapes of resin, are provided at the antenna units  118 ,  120 . Main body antennas  124 , which are coil-shaped and formed by winding an electrically conductive wire material such as a copper wire or the like, are disposed within the casing portions  122 . Coil axes BC (see  FIG. 5 ) of these antenna units  118 ,  120  are parallel to the directions of thickness of the casing portions  122 . The front and reverse surfaces (coil surfaces) of the antenna units  118 ,  120  along the direction orthogonal to the axes are parallel to the surface directions of the casing portions  122 . Here, the antenna unit  118  which is disposed at the uppermost level of the cartridge holder  34  is supported such that the surface direction thereof, which is orthogonal to the axial direction thereof, is substantially orthogonal to the thickness direction of the device (the direction of arrow W). The antenna unit  120  which is disposed between the middle level and the bottommost level is supported such that the surface direction thereof is substantially orthogonal to the heightwise direction of the device (the direction of arrow H). 
     As shown in  FIG. 3 , in the state in which the toner cartridges  36 ,  38 ,  40 ,  42  are loaded in the cartridge holder  34 , the upper antenna unit  118  is supported so as to be inserted in the gap formed between the toner cartridges  36 ,  38  along the widthwise direction of the device, and the lower antenna unit  120  is supported so as to be inserted into the gap formed between the toner cartridges  40 ,  42  along the heightwise direction of the device. 
     At the toner cartridge  36  which is loaded in the cartridge loading portion  96 , the wireless communication tag  72  is fit and inserted in the accommodating portion  68 A within the accommodating chamber  68 . At the toner cartridge  38  which is loaded in the cartridge loading portion  98 , the wireless communication tag  72  is fit and inserted in the accommodating chamber  64 . In this way, the coil surface of the tag antenna  82  at the toner cartridge  36  directly opposes one coil surface along the thickness direction of the main body antenna  124  and is sufficiently close to this one coil surface. The coil surface of the tag antenna  82  at the toner cartridge  38  opposes the other coil surface along the thickness direction of the main body antenna  124  and is sufficiently close to this other coil surface. 
     Further, at the toner cartridge  40  which is loaded in the cartridge loading portion  100 , the wireless communication tag  72  is fit and inserted in the accommodating chamber  66 . At the toner cartridge  42  which is loaded in the cartridge loading portion  102 , the wireless communication tag  72  is fit and inserted in the accommodating portion  68 B at the accommodating chamber  68 . In this way, the coil surface of the tag antenna  82  at the toner cartridge  40  directly opposes the upper coil surface of the main body antenna  124  and is sufficiently close to this upper coil surface. The coil surface of the tag antenna  82  at the toner cartridge  42  directly opposes the lower coil surface of the main body antenna  124  and is sufficiently close to this lower coil surface ( FIG. 5 ). 
     Here, usually, the transmission and receiving of radio waves between the tag antenna  82  and the main body antenna  124  is such that, the shorter the distance between the antennas, the better the efficiency of the transmission and receipt of radio waves. Further, the more the tag antenna  82  and the main body antenna  124  approach a parallel positional relationship, the better the efficiency of the transmission and receipt of radio waves. At the laser printer  10 , the tag antennas  82  attached to the toner cartridges  38 ,  40 ,  42  are supported parallel to the main body antennas  124 . The transmission and receipt of radio waves with the main body antennas  124  can be carried out at substantially the highest efficiency, under the condition that the distance between the antennas is constant. Further, although the tag antenna  82  which is attached to the toner cartridge  36  is supported so as to be inclined at a given angle (of about 20°) with respect to the main body antenna  124 , the distance between this tag antenna  82  and the main body antenna  124  is sufficiently small. Therefore, the transmission and receipt of radio waves can be carried out with sufficiently high efficiency. In other words, if the output of radio waves used between the wireless communication tags  72  and a wireless communication device  130  at the main body (see  FIG. 11 ) is made to be sufficiently small, a state of good communication can be maintained between the main body antenna  124  and the wireless communication tags  72  which are set to have a communicating relationship with this main body antenna  124 , and interference between this main body antenna  124  and the wireless communication tags  72  which are not set to have a communicating relationship with this main body antenna  124  can be reliably prevented. 
     Further, when the toner cartridges  36 ,  38 ,  40 ,  42  are not loaded perfectly in the cartridge loading portions  96 ,  98 ,  100 ,  102 , the distance between the tag antenna  82  and the main body antenna  124  is longer than the designed set value. Thus, communication between the wireless communication device  130  and the wireless communication tags  72  of the toner cartridges  36 ,  38 ,  40 ,  42  which are not perfectly loaded cannot be carried out properly. Accordingly, if the wireless communication device  130  cannot carry out communication properly with the wireless communication tag  72  of any of the toner cartridges  36 ,  38 ,  40 ,  42 , an alarm signal corresponding to this situation may be outputted to a central controlling section or the like, and the central controlling section or the like may carry out control for informing the user that the toner cartridge is not loaded perfectly. 
     As shown in  FIG. 8 , when the tubular bodies  44  of the toner cartridges  36 ,  38 ,  40 ,  42  are being manufactured, four identification keys  44 A,  44 B,  44 C,  44 D are molded integrally on the outer peripheral surfaces thereof. These identification keys  44 A,  44 B,  44 C,  44 D are formed in the shape of projections which are long and thin along the axial direction, and are arranged at a uniform pitch along the peripheral direction at the lower portion side of the tubular body  44 . Here, these four identification keys  44 A,  44 B,  44 C,  44 D are provided so as to correspond to the four types of toners (M toner, Y toner, K toner, and C toner) housed in the toner cartridges  36 ,  38 ,  40 ,  42 . When the toner cartridge  36 ,  38 ,  40 ,  42  which accommodates a given type (color) of toner is being assembled, three of the identification keys  44 A,  44 B,  44 C,  44 D, which correspond to the toners other than the toner which is to be housed, are removed from the tubular body  44 . Only one of the identification keys  44 A,  44 B,  44 C,  44 D, which corresponds to the toner which is to be housed, remains at the tubular body  44 . 
     The identification keys  44 A,  44 B,  44 C,  44 D are removed from the tubular body  44  by, for example, a shearing force being applied thereto while the base (root) portion thereof is heated. Or, instead of the identification keys  44 A,  44 B,  44 C,  44 D being molded integrally with the tubular body  44 , four or more key attaching portions for attaching at least the identification keys may be formed at the tubular body  44 . In this case, a plate-shaped identification key may be fixed to one of the key attaching portions by insertion, adhesion, or the like, such that an identification key is attached to the tubular body  44  at the position corresponding to the toner. 
     As shown in  FIG. 5 , a slit-shaped engaging groove  113  is formed at each of the cartridge loading portions  96 ,  98 ,  100 ,  102  of the cartridge holder  34  in the lower side guide member  112  at a region corresponding to one of the four identification keys  44 A,  44 B,  44 C,  44 D. (In  FIG. 5 , only the guide members  112  of the cartridge loading portions  100 ,  102  are illustrated.) The engaging groove  113  extends from the supporting plate  104  side one end of the guide member  112  to a vicinity of the center of the guide member  112  along the depthwise direction of the device. In this way, when the toner cartridges  36 ,  38 ,  40 ,  42  are loaded in the respective cartridge loading portions  96 ,  98 ,  100 ,  102 , the identification keys  44 A,  44 B,  44 C,  44 D can move toward the rear of the device along the engaging grooves  113  only in cases in which the correct toner cartridges  36 ,  38 ,  40 ,  42  housing the predetermined types of toners are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 . In cases in which an attempt is made to load incorrect toner cartridges  36 ,  38 ,  40 ,  42 , which are housing toners other than the predetermined types, into the cartridge loading portions  96 ,  98 ,  100 ,  102 , the identification keys  44 A,  44 B,  44 C,  44 D collide with the end surfaces of the guide members  112 , and movement toward the rear of the device is impeded. 
     Accordingly, insertion of the toner cartridges  36 ,  38 ,  40 ,  42  into the cartridge loading portions  96 ,  98 ,  100 ,  102  is impeded only when the user erroneously attempts to load incorrect toner cartridges  36 ,  38 ,  40 ,  42  into the cartridge loading portions  96 ,  98 ,  100 ,  102 . Thus, mistakes in loading the toner cartridges  36 ,  38 ,  40 ,  42  into the cartridge loading portions  96 ,  98 ,  100 ,  102  can reliably be prevented. 
     In place of providing the identification keys  44 A,  44 B,  44 C,  44 D at the toner cartridges  36 ,  38 ,  40 ,  42 , it is possible to form cartridge identification grooves, which extend along the axial direction, in respectively different regions for each type of toner, and to provide, at the guide members  112  of the cartridge loading portions  96 ,  98 ,  100 ,  102 , projecting portions which respectively correspond to the cartridge identification grooves. 
     Moreover, a cartridge identification portion may be provided at each of the toner cartridges  36 ,  38 ,  40 ,  42 , and at each of the cartridge loading portions  96 ,  98 ,  100 ,  102 , a mechanical sensor may be provided which detects the configuration, position or the like of the cartridge identification portion and identifies the type of the toner cartridge  36 ,  38 ,  40 ,  42 , or, an information reading sensor may be provided which optically, magnetically, or mechanically reads information corresponding to the cartridge type which is recorded at the cartridge identification portion and identifies the type of the loaded toner cartridge  36 ,  38 ,  40 ,  42 . In this way, in a case in which the correctness/incorrectness of the loaded toner cartridge  36 ,  38 ,  40 ,  42  is judged on the basis of a signal from the mechanical sensor or the information reading sensor, and it is judged that an incorrect toner cartridge  36 ,  38 ,  40 ,  42  has been loaded, the central control section or the like of the laser printer  10  can execute control such as, for example, interlocking the operations of the device, outputting an alarm signal to the user, or the like. 
     (Structure and Operation of Wireless Communication System) 
     Next, description will be given of the structure and the operation of the laser printer which is structured as described above and which is equipped with the wireless communication system relating to the present embodiment. 
     The structure of the wireless communication system relating to the present embodiment is illustrated as a block diagram in  FIG. 11 . A wireless communication system  128  is formed by the wireless communication tags  72  which are attached to the four toner cartridges  36 ,  38 ,  40 ,  42 , and the wireless communication device  130  which is provided at the device main body. The wireless communication device  130  is equipped with the two antenna units  118 ,  120  which are disposed at the cartridge holder  34 , and a main body portion  132  to which these antenna units  118 ,  120  are connected. 
     As described above, each of the wireless communication tags  72  which are attached to the toner cartridges  36 ,  38 ,  40 ,  42  has the coil-shaped tag antenna  82  and the IC chip  94  which is packaged on the circuit board  92 . As shown in  FIG. 11 , the IC chip  94  is structured as a single element in which a CPU  134 , a transmitting/receiving circuit  136 , a power source circuit  138 , a ROM  140  and an EEPROM  142  are integrated. The CPU  134  controls the entire wireless communication tag  72  in accordance with a control program stored in the ROM  140 . In addition to the control program, a multi ID, a password, and a system ID are stored in the ROM  140  as unique information corresponding to the type of the toner cartridge  36 ,  38 ,  40 ,  42 . Here, the multi ID is basically data applied in accordance with the type of the toner cartridge  36 ,  38 ,  40 ,  42 . The password and the system ID are data for confirming that the wireless communication tag  72  is a wireless communication tag  72  which is allowed to exchange information with the wireless communication device  130 . 
     The EEPROM  142  is a non-volatile information storage element which does not require electric power in order to maintain stored information. Arbitrary information can be written into the EEPROM  142  by the CPU  134 , and arbitrary information can be read from the written information. Specifically, information such as the following, for example, is written into the EEPROM  142  by the CPU  134 , and as needed, the contents of the written information are updated: 
     (A) process information such as the amount of exposure, the amount of charge, the developing bias and the like of the photosensitive drums  20 ,  22 ,  24 ,  26 ; 
     (B) for the toner cartridges  36 ,  38 ,  40 ,  42 : their lot number, manufacturing date, type, storage period, identification number, number of times recycling has been carried out, upper limit value of number of times recycling can be carried out, and replacement periods of the structural parts of the cartridge; 
     (C) for the toners: their lot number, manufacturing date, filled amount, type, storage period, number of times recycling has been carried out, and upper limit value of number of times recycling can be carried out. 
     At the time of transmitting information, the transmitting/receiving circuit  136  of the wireless communication tag  72  converts the parallel information signal which has been sent in from the CPU  134  into a serial information signal, and thereafter, outputs to the tag antenna  82  an electric signal which has been modulated by this information signal. In this way, a radio wave signal corresponding to the information signal from the CPU  134  is outputted from the tag antenna  82 . At the time of receiving information, the transmitting/receiving circuit  136  demodulates the electric signal, which was obtained from the radio wave signal received from the tag antenna  82 , into a serial information signal, and thereafter, converts this information signal into a parallel information signal and outputs it to the CPU  134 . 
     When the power source circuit  138  of the wireless communication tag  72  is engaging in transmission and receipt with the wireless communication device  130 , the power source circuit  138  separates, from the information signal, alternating current of a predetermined frequency generated by the electromagnetic induction at the tag antenna  82 . After converting this alternating current into direct current, the power source circuit  138  supplies the direct current to the CPU  134  and the transmitting/receiving circuit  136 . In this way, the electric power needed at the time of engaging in transmission and receipt with the wireless communication device  130  is supplied to the CPU  134  and the transmitting/receiving circuit  136 , and a power source such as a battery or the like is not needed at the wireless communication tag  72 . 
     As shown in  FIG. 11 , a CPU  144 , a transmitting/receiving circuit  146 , a power source circuit  148 , a ROM  150 , a RAM  152  and an interface circuit  154  are provided at the main body portion  132  of the wireless communication device  130 . Here, the transmitting/receiving circuit  146  has two input/output terminals  146 A,  146 B for the antennas. The main body antenna  124  of the antenna unit  118  is connected to the one input/output terminal  146 A, and the main body antenna  124  of the antenna unit  120  is connected to the other input/output terminal  146 B. When the transmitting/receiving circuit  146  is carrying out information transmission and receipt with the wireless communication tag  72 , only one of the input/output terminals  146 A,  146 B is on and the other is off, in accordance with the source of the input of the information or the destination of the output of the information. 
     The CPU  144  controls the entire wireless communication device  130  in accordance with the control program stored in the ROM  150 . Further, in addition to the control program, the ROM  150  stores multi IDs, passwords, and system IDs for all of the toner cartridges  36 ,  38 ,  40 ,  42 . By comparing the multi ID and the password inputted from the wireless communication tag  72  and the multi IDs and the passwords stored in the ROM  150 , the CPU  144  identifies the type of the toner cartridge  36 ,  38 ,  40 ,  42  to which is attached the wireless communication tag  72  which is currently transmitting radio waves. The CPU  144  also confirms that the wireless communication tag  72  is a wireless communication tag  72  which is permitted to exchange information with the wireless communication device  130 . 
     The CPU  144  temporarily stores, in the RAM  152 , the process information, such as the exposure amount, charge amount, developing bias, and the like with respect to the photosensitive drums  20 ,  22 ,  24 ,  26  for the respective toner cartridges  36 ,  38 ,  40 ,  42 , which information has been transmitted in from the central control section (not shown) of the laser printer  10  through the interface circuit  154 , and also temporarily stores writing information, such as the toner consumption amount and the like, which are computed on the basis of the process information. Thereafter, at a predetermined timing, the CPU  144  reads transmission information from the RAM  152 , and transmits the information to the wireless communication tag  72 . In this way, the CPU  134  of the wireless communication tag  72  writes in the EEPROM  142  the writing information received from the wireless communication device  130 , and records in the EEPROM  142  the remaining amount of toner which is obtained by subtracting the consumed amount of toner from the filled amount of toner. 
     When the transmitting/receiving circuit  146  of the main body portion  132  transmits information, the transmitting/receiving circuit  146  converts the parallel information signal which has been sent in from the CPU  144  into a serial information signal, and thereafter, outputs an electric signal, which has been modulated by this information signal, to either of the two main body antennas  124 . In this way, a radio wave signal corresponding to the information signal from the CPU  144  is outputted from the main body antenna  124 . When the transmitting/receiving circuit  146  receives information, the transmitting/receiving circuit  146  demodulates an electric signal, which is obtained by radio waves received from the main body antenna  124 , into a serial information signal. Thereafter, the transmitting/receiving circuit  146  converts this information signal into a parallel information signal, and outputs the parallel information signal to the CPU  144 . 
     During communication with the wireless communication tag  72 , the power source circuit  148  in the main body portion  132  supplies alternating current of a predetermined frequency to the main body antenna  124 . In this way, electromagnetic induction arises at the tag antenna  82  which is facing that main body antenna  124 , and as described above, the induced current (electric power) is supplied to the wireless communication tag  72 . Here, at the time of transmitting, the same band as that of the frequency of the electric signal used in information forwarding by the transmitting/receiving circuits  136 ,  146  is selected for the frequency of the alternating current supplied to the main body antenna  124  by the power source circuit  148 . At the time of receiving, a different band than that of the frequency of the electric signal used in information forwarding by the transmitting/receiving circuits  136 ,  146  (e.g., a high frequency band) is selected for the frequency of the alternating current supplied to the main body antenna  124  by the power source circuit  148 . 
     At the point in time when the CPU  144  of the main body portion  132  judges that all of the toners have been discharged from the toner cartridges  36 ,  38 ,  40 ,  42 , the CPU  144  transmits a count-up signal to the wireless communication tags  72  attached to the toner cartridges  36 ,  38 ,  40 ,  42 . The CPUs  134  of the wireless communication tags  72  which have received the count-up signal add a “1” to the number of times the toner cartridges  36 ,  38 ,  40 ,  42  have been recycled and the number of times the toners have been recycled, which numbers of times are written in the EEPROM  142 . 
       FIG. 15  illustrates the series of operations of the communication starting processing at the wireless communication system  128  relating to the present embodiment. At the laser printer  10 , the communication starting processing of the wireless communication system  128 , which processing is shown in  FIG. 15 , is carried out by the CPU  144  of the wireless communication device  130  when the power of the laser printer  10  is turned on, when the cartridges  36 ,  38 ,  40 ,  42  are replaced, when resetting processing is carried out after occurrence of an abnormality such as a jam, or the like. 
     At the wireless communication system  128 , the destinations of communication which carry out communication with the wireless communication device  130  are, correctly speaking, the wireless communication tags  72  attached to the toner cartridges  36 ,  38 ,  40 ,  42 . However, in the following description relating the flowchart of  FIG. 15 , when there is no need to precisely distinguish the destination of communication, the destination of communication of the wireless communication device  130  will simply be termed “the toner cartridge  36 , the toner cartridge  38 , the toner cartridge  40  or the toner cartridge  42 ” in order to simplify explanation. 
     In the communication starting processing, in step  300 , it is judged whether the multi ID (M) of the wireless communication device  130  and the multi ID (M) of the toner cartridge  36  match. In step  300 , when the multi ID (M) of the wireless communication device  130  and the multi ID (M) of the toner cartridge  36  match, it is judged that the appropriate toner cartridge  36  has been loaded into the cartridge loading portion  96  of the cartridge holder  34 . The routine proceeds to step  304  where the wireless communication device  130  starts to communicate with the toner cartridge  36 . If the multi ID (M) of the wireless communication device  130  and the multi ID (M) of the toner cartridge  36  do not match, the routine moves to step  302 . In step  302 , it is judged that either the toner cartridge is not loaded normally in the cartridge loading portion  96  of the cartridge holder  34 , or that the toner cartridge loaded in the cartridge loading portion  96  is an incorrect toner cartridge, and a predetermined error processing is carried out. 
     In steps  304  through  306 , password collation and system ID collation are carried out in order between the wireless communication device  130  and the toner cartridge  36 . At this time, if either of the password and the system ID of the toner cartridge  36  do not match those which have been registered, it is judged that the toner cartridge loaded in the cartridge loading portion  96  is an improper toner cartridge, and the routine moves on to step  308  where a predetermined error processing is executed. Further, if it is judged that both the password and the system ID of the toner cartridge  36  are those which have been registered, the routine moves on to step  310 . In step  310 , the CPU  144  of the wireless communication device  130  controls the wireless communication tag  72  of the toner cartridge  36 , and reads, from the EEPROM  142 , process information such as the exposure amount, the charge amount, the developing bias, and the like of the photosensitive drums  20 ,  22 ,  24 ,  26 , and the toner information such as the filled amount, the type, the storage period, and the like of the toner. 
     In step  312 , the CPU  144  of the wireless communication device  130  carries out reading checking with the CPU  134  of the toner cartridge  36 , so as to judge whether or not the information read from the EEPROM  142  and the information written in the EEPROM  142  match. If the information match, the routine moves on to step  314 . If the information do not match, the routine returns to step  310 , and the processing of reading information from the EEPROM  142  is repeated until the information read from the EEPROM  142  and the information written in the EEPROM  142  match. In  FIG. 15 , the abbreviation “NG” stands for “no good”, the opposite of “OK”. 
     In step  314 , the CPU  144  of the wireless communication device  130  transmits, to the wireless communication tag  72  at the toner cartridge  36 , initial information such as the identification number specific to the laser printer  10 , the identification number specific to the user, the starting time of use of the toner cartridge  36 , and the like, and writes this initial information in the EEPROM  142  of the wireless communication tag  72 . In step  316 , the CPU  144  of the wireless communication device  130  carries out writing checking with the CPU  134  of the toner cartridge  36 , so as to judge whether or not the transmitted initial information has been written without errors in the EEPROM  142 . If the information match, the communication starting processing with the toner cartridge  36  is completed. If the information do not match, the routine returns to step  314 , and the processing of writing information in the EEPROM  142  is repeated until the initial information transmitted to the wireless communication tag  72  matches the information written in the EEPROM  142 . 
     In the wireless communication system  128 , when the communication starting processing for the toner cartridge  36  which houses the M toner is completed, basically the same processings as the series of communication starting processings shown in  FIG. 15  are carried out in order as well with the toner cartridges  38 ,  40 ,  42  which house the other toners of Y, K and C. After the communication starting processing between the wireless communication device  130  and all of the toner cartridges  36 ,  38 ,  40 ,  42  has been completed, the central control section of the laser printer  10  cancels the interlocking such that the image forming operation can be started. 
     Each time image formation is carried out one time, or each time image formation is carried out a predetermined number of times, the central control section outputs, through the interface circuit  154  at the wireless communication device  130  and to the CPU  144 , the process information corresponding to the toner cartridges  36 ,  38 ,  40 ,  42  and the information relating to the amounts of consumed toner and the like. The CPU  144  transmits the information from the central control section to the wireless communication tags  72  of the corresponding toner cartridges  36 ,  38 ,  40 ,  42 , and writes the information from the central control section in the EEPROMs  142  of the wireless communication tags  72 . 
     Operation of the Embodiment 
     Next, operation of the laser printer having the wireless communication system, which relates to the present embodiment and is structured as described above, will be described. 
     In the laser printer  10  having the wireless communication system  128  relating to the present embodiment, the accommodating chambers  64 ,  66  and the accommodating portions  68 A,  68 B, to which the wireless communication tag  72  can be attached, are provided at a plurality of regions of the toner cartridges  36 ,  38 ,  40 ,  42 , which regions correspond to the respective cartridge loading portions  96 ,  98 ,  100 ,  102 . The wireless communication tag  72  is selectively attached to one of the accommodating chambers  64 ,  66  and the accommodating portions  68 A,  68 B which corresponds to the cartridge loading portion  96 ,  98 ,  100 ,  102  in which the toner cartridge  36 ,  38 ,  40 ,  42  is loaded. In this way, in the state in which the toner cartridges  36 ,  38 ,  40 ,  42  which house the different toners are loaded in the respective cartridge loading portions  96 ,  98 ,  100 ,  102 , the positions of the respective wireless communication tags  72  attached to the toner cartridges  36 ,  38 ,  40 ,  42  can be adjusted such that the wireless communication tags  72  are substantially parallel to and sufficiently close to the main body antennas  124  of the antenna units  118 ,  120 . Thus, the communication by radio waves between the wireless communication tags  72  attached to the toner cartridges  36 ,  38 ,  40 ,  42  and the wireless communication device  130  provided at the device main body, and the supply of electric power to the IC chips  94 , can be carried out stably via the tag antennas  82  and the main body antennas  124 . 
     In accordance with the laser printer  10  having the wireless communication system  128 , a common structure and configuration can be used for the toner cartridges  36 ,  38 ,  40 ,  42  which are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 . Thus, the cost of manufacturing the toner cartridges  36 ,  38 ,  40 ,  42  can be reduced, and the work by the manufacturer or the like for recycling the toner cartridges  36 ,  38 ,  40 ,  42  after they have been used is facilitated. 
     Further, in most cases, the used toner cartridges  36 ,  38 ,  40 ,  42  which have been removed from the laser printer  10  are recovered and recycled by the manufacturer or the like. At this time, there are cases in which, after the wireless communication tags  72  have been removed from the toner cartridges  36 ,  38 ,  40 ,  42  and the data and the like recorded on the wireless communication tags  72  have been rewritten, the work of attaching the wireless communication tags  72  to toner cartridges which have not yet been used or which have been recycled is carried out. In such cases as well, in the wireless communication system  128  of the present embodiment, the wireless communication tags  72  can easily be removed from the toner cartridges  36 ,  38 ,  40 ,  42  merely by elastically deforming vicinities of the anchor claws  74  of the wireless communication tags  72  toward the inner peripheral side by using a tool exclusively used therefor or the like. Thus, the work for recycling the wireless communication tag  72  units can also be carried out easily. 
     Cases can be conceived of in which the used toner cartridges  36 ,  38 ,  40 ,  42  are recovered by irregular dealers which are not legitimate dealers such as the manufacturer or the like, and these irregular dealers will attempt to carry out the work of recycling the toner cartridges  36 ,  38 ,  40 ,  42 . When the toner cartridges  36 ,  38 ,  40 ,  42  which have been recycled by irregular dealers are loaded in the laser printer  10 , there is the concern that problems may arise such as the device will malfunction, the image quality will deteriorate, or the like. In order to prevent such problems, for example, it is effective to prevent the wireless communication tags  72  from being removed from the toner cartridges  36 ,  38 ,  40 ,  42  by irregular dealers. 
     Here, a method is thought of in which it is possible to remove without damage the wireless communication tags  72 , which are attached to the accommodating chambers  44 ,  46  and the accommodating portions  48 A,  48 B of the toner cartridges  36 ,  38 ,  40 ,  42 , only in cases in which the removal operation is carried out in accordance with a predetermined process. As a concrete method of realizing such a method, for example, it has been thought to mold the outer covering portion of the wireless communication tag  72  from a resin material which has sufficient elastic deformation only when heated to a predetermined temperature. When the wireless communication tag  72  is to be removed, if the vicinities of the anchor claws  74  are not elastically deformed toward the inner peripheral side while being heated to a predetermined temperature, the wireless communication tag  72  is destroyed. As another method, it has been thought to provide a locking mechanism, such as a dial locking mechanism, an electromagnetic-type locking mechanism, or the like, at the wireless communication tag  72 . If a predetermined lock releasing operation is not carried out on the wireless communication tag  72  from the exterior or predetermined lock releasing data is not inputted to the wireless communication tag  72  from the exterior, the locked state by the locking mechanism is not cancelled, and the wireless communication tag  72  cannot be removed without being damaged. 
     Modified Examples of the Present Embodiment 
     Next, first and second modified examples of the toner cartridge in the wireless communication system relating to the embodiment of the present invention will be described. Note that the portions of the toner cartridges relating to these modified examples, which are other than the wireless communication tags  72  and the attaching portions thereof, have the same structures as in the toner cartridges  36 ,  38 ,  40 ,  42  (see  FIG. 4 ) which were previously described. Thus, members of the toner cartridges relating to the modified examples, which members have structures and operations which are the same as in the toner cartridges  36 ,  38 ,  40 ,  42 , are denoted by the same reference numerals, and description thereof is omitted. 
       FIG. 12  illustrates a first modified example of the toner cartridge of the wireless communication system relating to the embodiment of the present invention. A toner cartridge  200  is provided with a tag affixing portion  202  at the outer peripheral surface of the tubular body  44 . A wireless communication tag  204 , which is formed in a thin-walled plate shape, can be affixed to the tag affixing portion  202 . The tag affixing portion  202  is provided at the end portion (the distal end portion) of the tubular body  44  at the side where the driven connecting plate  52  is provided. The tag affixing portion  202  is groove-shaped and has a diameter which is smaller, by a predetermined length, than the other portions of the outer peripheral surface of the tubular body  44 . The configuration of the wireless communication tag  204  along the surface direction is substantially rectangular. The wireless communication tag  204  is affixed to the tag affixing portion  202  via a fixing layer formed by an adhesive, a pressure-sensitive adhesive, two-sided tape, or the like, such that the longitudinal direction of the wireless communication tag  204  coincides with the peripheral direction of the tubular body  44 . 
     The width of the tag affixing portion  202  along the axial direction is slightly larger than the width of the wireless communication tag  204  along the shorter side direction thereof. The thickness of the tag affixing portion  202  along the radial direction is substantially the same as the thickness of the wireless communication tag  204 . The wireless communication tag  204  is structured by, for example, laminating two sheet materials formed of resin or the like. A tag antenna  206 , which is formed of a thin metal film patterned in a coil shape, is provided between these sheet materials. A thin-film-like IC chip  208  is disposed at the central portion of the tag antenna  206 . The internal structure of the IC chip  208  is basically the same as that of the IC chip  94  which was described above with reference to  FIG. 11 . Thus, description of the internal structure of the IC chip  208  will be omitted. The wireless communication tag  204  either is elastic so as to be able to curve along the longitudinal direction, or is curved in advance along the longitudinal direction so as to have a radius of curvature which is substantially the same as that of the bottom surface portion of the tag affixing portion  202 . 
     When the wireless communication tag  204  is to be affixed to the tag affixing portion  202  of the toner cartridge  200 , the fixing layer is provided in advance at the inner peripheral surface of the wireless communication tag  204 . The wireless communication tag  204  is inserted into the tag affixing portion  202 . The entire inner peripheral surface of the wireless communication tag  204  is made to fit tightly against the bottom surface portion of the tag affixing portion  202  via the fixing layer. The wireless communication tag  204  is positioned precisely in the axial direction at a predetermined position by the tag affixing portion  202 , and the position of the wireless communication tag  204  can be adjusted to an arbitrary position in the peripheral direction around the axial center S. 
     When the toner cartridge  200  illustrated in  FIG. 12  is applied to the wireless communication system  128  relating to the present embodiment, the wireless communication tags  204  are selectively affixed to regions of the tag affixing portions  202  of the toner cartridges  200 , which regions correspond to the cartridge loading portions  96 ,  98 ,  100 ,  102 . In this way, in the state in which the four toner cartridges  200  housing the respectively different toners are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 , the positions of the wireless communication tags  204  affixed to the toner cartridges  200  can be adjusted such that the wireless communication tags  204  are substantially parallel to and sufficiently close to the main body antennas  124  of the antenna units  118 ,  120 . Thus, the communication by radio waves between the wireless communication tags  204  attached to the four toner cartridges  200  and the wireless communication device  130  provided at the device main body, and the supply of electric power to the IC chips  208 , can be carried out stably via the tag antennas  206  and the main body antennas  124 . 
     Further, a common structure and configuration can be used for the respective toner cartridges  200  which are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 . Thus, the cost of manufacturing the toner cartridges  200  can be reduced, and the work by the manufacturer or the like for recycling the toner cartridges  200  after they have been used is facilitated. 
     At the toner cartridge  200 , because the wireless communication tag  204  which is affixed to the tag affixing portion  202  is exposed at the surface portion of the toner cartridge  200 , the outer covering portion of the tubular body  44  of the like of the toner cartridge  200  does not exist between the wireless communication tag  204  and the main body antenna  124 . As a result, even in cases in which the outer covering portion of the toner cartridge  200  is formed of a material which blocks radio waves such as metal or the like, radio wave communication between the wireless communication tag  204  and the wireless communication device  130  can be carried out well. 
     In the toner cartridge  200  shown in  FIG. 12 , the tag affixing portions  202  are provided so as to extend in the peripheral direction, in accordance with the arrangement of the cartridge loading portions  96 ,  98 ,  100 ,  102  in the laser printer  10 . However, when the toner cartridge  200  is applied to image forming devices in which the arrangement of the cartridge loading portions is different than in the present embodiment, the tag attaching portions to which the wireless communication tags  204  are affixed can be provided at arbitrary regions of the toner cartridges  200  in accordance with the arrangement of the cartridge loading portions. Further, the wireless communication tags  204  can be directly affixed to arbitrary regions of the outer peripheral surfaces of the tubular bodies  44 , without providing the tag attaching portions. 
     A second modified example of the toner cartridge in the wireless communication system relating to the embodiment of the present invention is illustrated in  FIGS. 13 and 14 . A toner cartridge  210  is provided with a tag accommodating portion  212  which extends along the peripheral direction at the outer peripheral side of the driven connecting plate  52  and which opens toward the distal end surface of the toner cartridge  210 . The tag accommodating portion  212  is disposed between a peripheral wall portion  214  at the distal end side of the tubular body  44 , and a tubular portion  216  which is provided coaxially at the inner peripheral side of the peripheral wall portion  214 . The tag accommodating portion  212  is formed as an annular space having a predetermined radius of curvature and centered around the axial center S. 
     A wireless communication tag  218  is formed in the shape of a plate which is substantially rectangular and has a uniform thickness. The wireless communication tag  218  is curved along the longitudinal direction thereof so as to have the same radius of curvature as the tag accommodating portion  212 . Here, the thickness of the wireless communication tag  218  is slightly smaller than the width of the tag accommodating portion  212  along the radial direction. A tag antenna  220 , which is formed by a metal wire wound in a coil shape, is provided within the wireless communication tag  218 . An IC chip  222  is disposed at the central portion of the tag antenna  220 . The internal structure of the IC chip  222  is basically the same as that of the IC chip  94  which was described previously on the basis of  FIG. 11 . Therefore, description of the internal structure of the IC chip  222  will be omitted. 
     The wireless communication tag  218  is accommodated in the tag accommodating portion  212  in a state in which the shorter side direction of the wireless communication tag  218  is parallel to the axial center S. At this time, because the wireless communication tag  218  and the tag accommodating portion  212  are curved at the same radius of curvature, the wireless communication tag  218  is supported so as to be slidable (rotatable) along the inner peripheral surface of the peripheral portion  214  and the outer peripheral surface of the tubular portion  216 , within the tag accommodating portion  212  and in the peripheral direction which is centered around the axial center S. 
     As shown in  FIG. 13 , slit-shaped insert-through grooves  224  which extend in the peripheral direction are formed in the peripheral wall portion  214  of the tubular body  44 . The insert-through grooves  224  are provided so as to be discontinuous along the peripheral direction, and are provided to include at least regions corresponding respectively to the cartridge loading portions  96 ,  98 ,  100 ,  102 . On the other hand, as shown in  FIG. 14 , a screw hole  226 , which opens to face the insert-through groove  224 , is formed in the wireless communication tag  218 . 
     When the wireless communication tag  218  which is inserted in the tag accommodating portion  212  is to be fixed, the position of the wireless communication tag  218  is adjusted, along the peripheral direction, to a position corresponding to one of the cartridge loading portions  96 ,  98 ,  100 ,  102 . Thereafter, a screw  228  for fixing is screwed-in into the screw hole  226  of the wireless communication tag  218  through the insert-through groove  224 , and the screw  228  is tightened with a sufficient fastening torque. In this way, a sufficiently large frictional force arises between the outer peripheral surface of the wireless communication tag  218  and the inner peripheral surface of the peripheral wall portion  214 , and the wireless communication tag  218  is reliably fixed within the tag accommodating portion  212 . 
     When the toner cartridge  210  illustrated in  FIG. 13  is applied to the wireless communication system  128  relating to the present embodiment, the positions of the wireless communication tags  218 , which are inserted in the tag accommodating portions  212  of the toner cartridges  210 , are selectively adjusted to positions corresponding to the cartridge loading portions  96 ,  98 ,  100 ,  102 , and the wireless communication tags  218  are fixed by the screws  228 . In this way, in the state in which the four toner cartridges  210  housing the respectively different toners are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 , the positions of the wireless communication tags  218  disposed at the respective toner cartridges  210  can be adjusted such that the wireless communication tags  218  are substantially parallel to and sufficiently close to the main body antennas  124  of the antenna units  118 ,  120 . Thus, the communication by radio waves between the wireless communication tags  218  attached to the four toner cartridges  210  and the wireless communication device  130  provided at the device main body, and the supply of electric power to the IC chips  208 , can be carried out stably via the tag antennas  220  and the main body antennas  124 . 
     Further, a common structure and configuration can be used for the respective toner cartridges  210  which are loaded in the cartridge loading portions  96 ,  98 ,  100 ,  102 . Thus, the cost of manufacturing the toner cartridges  210  can be reduced, and the work by the manufacturer or the like for recycling the toner cartridges  210  after they have been used is facilitated. Moreover, merely by loosening the screws  228 , the positions of the wireless communication tags  218  in the peripheral direction can be adjusted, and the wireless communication tags  218  can be removed from the toner cartridges  210 . Thus, the recycling work can be carried out even more easily than with the toner cartridges  36 ,  38 ,  40 ,  42  and the toner cartridges  200 . 
     In the present embodiments, only cases were described in which the wireless communication system  128  relating to the present embodiment is used in communication between the wireless communication device  130  provided at the device main body of the laser printer  10 , and the toner cartridges  36 ,  38 ,  40 ,  42 ,  200 ,  210 . However, wireless communication tags may be attached, in addition to these toner cartridges, to process units which contain one or more process parts and an electrophotographic photosensitive body which can be attached to and removed from the device main body of the laser printer  10 , and to process parts such as an electrophotographic photosensitive body, a cleaning device, a charging device, a charge removing device, a developing device, and the like. Communication by radio waves can be carried out between the wireless communication device of the device main body and such process units, process parts, and the like, and various types of data can be written on and read from the wireless communication tags. 
     The basic structure of the wireless communication system relating to the present embodiment can be applied to various types of image forming devices other than laser printers, such as, for example, facsimile devices which form images by using an electrophotographic process, multifunction devices which form images by using an electrophotographic process and in which a printer, a facsimile device and the like are integrated, and the like. Moreover, the basic structure of the wireless communication system can be applied to image forming devices which form images without using an electrophotographic process, such as inkjet printers, thermal printers, and the like. Wireless communication tags can be attached to cartridge parts which are attached to and removed from the device main body, such ink cartridges, ink ribbon cartridges, and the like. 
     As described above, in accordance with the wireless communication system and the image forming device relating to the present invention, tag attaching portions at cartridge parts loaded in different cartridge loading portions in a device main body can be made to have common configurations and structures, and the position of a wireless communication tag at a cartridge part can easily be adjusted to a position suited for communication with a main body antenna.