Abstract:
A control adapter device for attaching to a control unit having an input control part is disclosed. The control adapter device includes a connector for electrically connecting the control adapter device to the control unit, a transmission part for transmitting, by wireless transmission, a signal that is input from the input control part, a case supporting the connector and containing the transmission part therein, an engagement member being supported by a shaft in the case for rotatable movement between an engagement position and a disengagement position, the engagement member being formed to engage the control unit, and including a press-maneuver part for receiving a pressing force to thereby rotate the engagement member, and a restriction member being disposed in the case to block movement of the press maneuver part of the engagement member, and thereby restrict movement of the engagement member beyond the disengagement position.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention generally relates to a control adapter device, and more particularly to a control adapter device to be attached to a control unit having an input control part.  
           [0003]    2. Description of the Related Art  
           [0004]    As for a control unit including an input control part for allowing the user to execute an inputting maneuver (input control), there are, for example, a keyboard of a personal computer, a controller for a television game machine, and a control part used in controlling computer-controlled conveying machines or industrial robots.  
           [0005]    These types of control units are able to conduct wireless transmission of signals by attaching thereto a control adapter device including a transmission part using, for example, electric waves, infrared rays, and/or light. A conventional example is shown in Japanese Laid-Open Patent Application No. 2002-73259.  
           [0006]    The control adapter device is provided with an engagement mechanism for engagement with a wall face of the control unit. The engagement mechanism is attached to the control unit in a manner that the engagement mechanism can separate from the wall face of the control unit when an engagement lever of the engagement mechanism is pressed in an engagement disengaging direction (direction disengaging the control adapter device from the control unit).  
           [0007]    There is a growing demand for a size-reduced and lightweight control adapter device that is to be mounted to the control unit in the aforementioned manner. For example, the control adapter device may have an antenna or a substrate including a transmission circuit installed inside of its case. Furthermore, the control adapter device may also have a connector or an engagement mechanism disposed in a space surrounding the substrate.  
           [0008]    In order to enable the engagement lever of the engagement mechanism to rotatably move such that the engagement lever will not contact the substrate or the connector, a stopper for restricting the angle of rotation of the rotating engagement lever is arranged at the fulcrum of the rotating engagement lever. The stopper, in the form of a cylindrical rib, has a step portion that is disposed in the vicinity of the rotation center so that the step portion is contacted by the engagement lever to thereby restrict the rotation angle of the engagement lever.  
           [0009]    The engagement lever, being a resin molded component, may lack strength and be susceptible to deformation when the radial thickness of the engagement lever is uniformly formed for improving moldability.  
           [0010]    Therefore, when a pressing force is applied to a press-maneuver part for rotatively moving the engagement lever to the engagement disengaging direction, the engagement lever deforms (bends) when the engagement lever contacts the step portion of the cylindrical rib (stopper) formed in the periphery of the rotation center, and adversely affects the maneuvering feel of the press-maneuver part.  
         SUMMARY OF THE INVENTION  
         [0011]    It is a general object of the present invention to provide a control adapter device that substantially obviates one or more of the problems caused by the limitations and disadvantages of the related art.  
           [0012]    Features and advantages of the present invention are set forth in the description which follows, and in part will become apparent from the description and the accompanying drawings, or may be learned by practice of the invention according to the teachings provided in the description. Objects as well as other features and advantages of the present invention will be realized and attained by a control adapter device particularly pointed out in the specification in such full, clear, concise, and exact terms as to enable a person having ordinary skill in the art to practice the invention.  
           [0013]    To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention provides a control adapter device for attaching to a control unit having an input control part, the control adapter device including: a connector for electrically connecting the control adapter device to the control unit; a transmission part for transmitting, by wireless transmission, a signal that is input from the input control part; a case supporting the connector and containing the transmission part therein; an engagement member being supported by a shaft in the case for rotatable movement between an engagement position and a disengagement position, the engagement member being formed to engage the control unit, and including a press-maneuver part for receiving a pressing force to thereby rotate the engagement member; and a restriction member being disposed in the case to block movement of the press maneuver part of the engagement member, and thereby restrict movement of the engagement member beyond the disengagement position. According to an embodiment of the present invention, the restriction member may be situated at the vicinity of a line along which the pressing force of the press-maneuver part is directed. According to an aspect of the invention, the engagement member will not deform during an engagement disengaging maneuver, and a satisfactory feel can be obtained during the engagement disengaging maneuver.  
           [0014]    According to an embodiment of the present invention, the restriction member may be situated at the vicinity of a line along which the pressing force of the press-maneuver part is directed. According to an aspect of the invention, the engagement member will not deform during an engagement disengaging maneuver, and a satisfactory feel can be obtained during the engagement disengaging maneuver.  
           [0015]    According to an embodiment of the present invention, the press-maneuver part may have a groove portion in which a surface thereof comes into contact with the restriction member, and which groove portion has a shape corresponding to the shape of the restriction member. According to an aspect of the invention, the engagement member will not deform during an engagement disengaging maneuver, and a satisfactory feel can be obtained during the engagement disengaging maneuver.  
           [0016]    Other objects and further features of the present invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0017]    [0017]FIG. 1 is a perspective view showing a mounting operation of a control adapter device  10  according to an embodiment of the present invention;  
         [0018]    [0018]FIGS. 2A through 2D are external views showing a structure of a control adapter device according to an embodiment of the present invention in which FIG. 2A is a front view, FIG. 2B is a plane view, FIG. 2C is a side view, and FIG. 2D is a rear view;  
         [0019]    [0019]FIG. 3 is an exploded perspective view showing the structure of a control adapter device according to an embodiment of the present invention;  
         [0020]    [0020]FIG. 4 is a perspective view showing an assembled state of the control adapter device of FIG. 3 where an upper case  32  is removed according to an embodiment of the present invention;  
         [0021]    [0021]FIG. 5 is an enlarged plan view showing an attachment structure of an engagement lever  44  and a torsion spring  48  of FIG. 3 according to an embodiment of the present invention;  
         [0022]    [0022]FIG. 6 is a side cross-sectional view showing a state before mounting a control adapter device  10  according to an embodiment of the present invention;  
         [0023]    [0023]FIG. 7 is a side cross-sectional view showing a state after mounting the control adapter device  10  according to an embodiment of the present invention;  
         [0024]    [0024]FIG. 8 is an exploded perspective view showing the structure of a control adapter device according to another embodiment of the present invention;  
         [0025]    [0025]FIG. 9 is a perspective view showing an assembled state of the control adapter device of FIG. 8 where an upper case  32  is removed according to another embodiment of the present invention;  
         [0026]    [0026]FIG. 10 is a side cross-sectional view showing a state before mounting a control adapter device  80  according to another embodiment of the present invention; and  
         [0027]    [0027]FIG. 11 is a side cross-sectional view showing a state after mounting the control adapter device  80  according to another embodiment of the present invention. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0028]    In the following, embodiments of the present invention are described with reference to the accompanying drawings.  
         [0029]    [0029]FIG. 1 is a perspective view showing an attachment operation of a control adapter device  10  according to an embodiment of the present invention.  
         [0030]    In FIG. 1, the control adapter device  10  is detachably attached to a casing wall  14  of a control unit  12 . An input control part including, for example, plural control buttons  16  and a control lever  18  is situated at the top surface of the control unit  12 . It is to be noted that the control unit  12  may be, for example, a keyboard of a personal computer, a controller of a television game machine, or a control part for controlling a computer controlled conveying machine or an industrial robot.  
         [0031]    The casing wall  14  includes a pair of engagement holes  20 ,  21 , which receive an engagement mechanism  54  (described below), and a receiving connector  22 . The control adapter device  10  is detachably attached to the casing wall  14  of the control unit  12  via the engagement holes  20 ,  22  and the receiving connector  22 .  
         [0032]    Press-maneuver parts  24 ,  25  for controlling engagement and disengagement are disposed at and protrude from each side of the control adapter device  10 . A transmission part  26  for conducting wireless transmission of signals is disposed at a case-front end  10   a  of the control adapter device  10 .  
         [0033]    Thus structured, when the user depresses the control button  16  or maneuvers the control lever  18  of the control unit  12 , a signal corresponding to such movements is transmitted by wireless transmission via the transmission part  26 .  
         [0034]    Accordingly, the user is able to switch the transmission type from a wire type to a wireless type by attaching the control adapter device  10  to the control unit  12 .  
         [0035]    The structure of the control adapter device  10  is next described.  
         [0036]    [0036]FIGS. 2A through 2D are exterior views of the structure of the control adapter  10 , in which FIG. 2A is a front view, FIG. 2B is a plan view, FIG. 2C is a side view, and FIG. 2D is a rear view.  
         [0037]    As shown in FIGS. 2A through 2D, the control adapter  10  includes a case main body  36 , formed from a combination of an upper case  32  and a lower case  34 . Openings  36   c ,  36   d  for allowing the press-maneuver parts  24 ,  25  to be inserted therethrough are formed on a left side surface  36   a and a right side surface  36   b  of the case main body  36 , respectively. Openings  36   f ,  36   g ,  36   h  for allowing engagement claws  38 ,  40 , and an inserting connector  30 , respectively to be inserted therethrough are formed in a rear surface  36   e  of the case main body  36 .  
         [0038]    The substrate  42 , to which the inserting connector  30  is attached, is installed inside the case main body  36 . Engagement mechanisms  54  (See FIG. 3) for engaging the control unit  12  with the control adapter device  10  are disposed at the left and right sides of the substrate  42 .  
         [0039]    The inserting connector  30  is disposed in a rearwardly protruding manner at the center portion of the rear surface  36   e.    
         [0040]    [0040]FIG. 3 is an exploded perspective view showing the structure of the control adapter device  10 . FIG. 4 is a perspective view showing an assembled state where the upper case  32  is removed.  
         [0041]    As shown in FIGS. 3 and 4, the control adapter device  10  contains and/or supports therein: the substrate  42  having a transmission circuit (not shown) disposed in the space created by the upper case  32  and the lower case  34 ; engagement levers  44 ,  46  disposed at left and right sides, respectively, of the substrate  42 ; and torsion springs  48 ,  50  biasing the engagement levers  44 ,  46 , respectively, in engagement directions.  
         [0042]    The inserting connector  30  is connected, as by soldering, to a rear portion of the lower surface of the substrate  42 . Respective electronic components forming a transmission circuit and a transmission antenna (not shown) are disposed at a rear portion of the upper surface of the substrate  42 . The substrate  42 , in a state in which the inserting connector  30  is inserted into a quadrangular connector installment wall portion  52 , is sandwiched between the upper case  32  and the lower case  34 .  
         [0043]    The engagement mechanisms  54  comprise the engagement levers  44 ,  46  and the torsion springs  48 ,  50 , respectively. In the illustrated exemplary embodiment, the engagement levers  44 ,  46  are disposed on the left and right in a symmetrical manner. The engagement levers  44 ,  46  include the respective press-maneuver parts  24 ,  25  at one end thereof, and respective engagement claws  38 ,  40  at the other end thereof.  
         [0044]    Groove portions  56 ,  58  into which coil portions  48   a ,  50   a  of the torsion springs  48 ,  50  are installed, are provided at midsections (in the longitudinal direction) of the engagement levers  44 ,  46 , respectively. Furthermore, rotative support portions  60 ,  62  are arranged above and below the groove portions  56 ,  58 , respectively. The rotative support portions  60 ,  62  are formed with round-shaped holes  60   a ,  62   a  for inserting therethrough shafts  64 ,  66 , respectively, uprightly formed at the inner surfaces of the upper case  32 , and the lower case  34 . Thus structured, the engagement levers  44 ,  46  rotate about the shafts  64 ,  66  (being engaged at the rotative support portions  60 ,  62 ) with the shafts  64 ,  66  serving as their rotating centers.  
         [0045]    The engagement levers  44 ,  46  also have arcuate groove portions  76 ,  78  that make contact against below-described stoppers (restriction members)  72 ,  74 , respectively. The arcuate groove portions  76 ,  78  are disposed at the inwardly facing side surfaces  44   a ,  46   a  situated at the rear side (inner side) of the press-maneuver parts  24 ,  25  of the engagement levers  44 ,  46 . Furthermore, the arcuate groove portions  76 ,  78  are situated at the proximity of a line (line of action) along which the pressing forces of the press-maneuver parts  24 ,  25  are directed.  
         [0046]    Accordingly, the stoppers  72 ,  74  are subjected to the pressing forces of the press-maneuver parts  24 ,  25  at the proximity of the line of action. Therefore, in a case where the engagement levers  44 ,  46  are rotated in a direction for disengaging (releasing) engagement, the stoppers  72 ,  74  restrict the rotation of the engagement levers  44 ,  46  by making contact against the arcuate groove portions  76 ,  78 , respectively. In such a case, the engagement levers  44 ,  46  are positively restricted from rotating without being bent since the stoppers  72 ,  74  are situated at the proximity of the line along which the pressing forces upon the press-maneuver parts  24 ,  25  are directed.  
         [0047]    The torsion springs  48 ,  50  are attached to the engagement levers  44 ,  46  in a manner so that coil portions  48   a ,  50   a  are housed in the groove portions  56 ,  58 , respectively, of the engagement levers  44 ,  46 . In addition, since the torsion springs  48 ,  50  are coiled around the outer periphery of the shafts  64 ,  66 , the torsion springs  48 ,  50  are attached to the engagement levers  44 ,  46  in a compact (space-saving) manner.  
         [0048]    Other than the aforementioned shafts  64 ,  66 , the inner surfaces of the upper and lower cases  32 ,  34  are provided with spring retaining portions  68 ,  70 , and column-shaped stoppers  72 ,  74 , respectively, for restricting the rotational movement of the engagement levers  44 ,  46 .  
         [0049]    [0049]FIG. 5 is an enlarged plan view for explaining an attachment structure of the engagement lever  44  and the torsion spring  48  (For convenience, only one side of the attachment structure is shown).  
         [0050]    As shown in FIG. 5, one end portion  48   b ( 50   b ) of the torsion spring  48  ( 50 ), extending substantially in a radially outward direction from the coil portion  48   a  ( 50   a ), is inserted through an opening part of the groove portion  56  ( 58 ), to thereby allow the torsion spring  48  ( 50 ) to contact against the inwardly facing side surface  44   a  ( 46   a ) of the engagement lever  44  ( 46 ). The other end portion  48   c  ( 50   c ) of the torsion spring  48  ( 50 ), extending substantially in a radially outward direction from the coil portion  48   a  ( 50   a ), is retained by the spring retaining portions  68  ( 70 ) provided upright on the inner surface of the upper case  32  and the lower case  34 .  
         [0051]    The one end portion  48   b  ( 50   b ) of the torsion spring  48  ( 50 ) presses against the inwardly facing side surface  44   a  ( 46   a ) situated at the rear side (inner side) of the press-maneuver parts  24  ( 25 ) of the engagement levers  44  ( 46 ).  
         [0052]    A pressure point P in the press-maneuver parts  24  ( 25 ) at which is applied a pressing force when the user pushes (rotates) the engagement lever  44  ( 46 ) in the engagement disengaging direction, is located in the vicinity of pressure point Q, at which is applied with a biasing force by spring contact from the one end  48   b  ( 50   b ) of the torsion spring  48  ( 50 ).  
         [0053]    Accordingly, owing to the biasing force of the spring at the pressure point Q, the one end  48   b  ( 50   b ) of the torsion spring  48  ( 50 ), pressing the side surface  44   a  ( 46   a ) situated on the rear side of the press-maneuver part  24  ( 25 ), resists the engagement disengaging force of the user, and exerts a biasing force against the press-maneuver part  24  ( 25 ).  
         [0054]    It is to be noted that in an exemplary embodiment of the present invention, the engagement lever  44  ( 46 ) is a resin mold member, and is relatively susceptible to elastic deformation in order to make uniform the radial thickness thereof. It may be considered that the engagement lever  44  ( 46 ) would bend during depression of the press-maneuver part  24  ( 25 ) since the distance from the shaft  64  ( 66 ) to the press-maneuver part  24  ( 25 ) is relatively long.  
         [0055]    However, according to this embodiment of the present invention, the engagement lever  44  ( 46 ) can be rotated with hardly any bending since the press-maneuver part  24  ( 25 ) is pressed in the vicinity of the pressure point Q by the one end portion  48   b  ( 50   b ) of the torsion spring  48  ( 50 ). Moreover, a steady and satisfactory pressing feel can be obtained when pressing the press-maneuver part  24  ( 25 ).  
         [0056]    Next, the operation of the engagement mechanism  54  and the mounting operation of the control adapter device  10  are described.  
         [0057]    [0057]FIG. 6 is a side cross-sectional view showing a state before mounting the control adapter device  10 .  
         [0058]    As shown in FIG. 6, in mounting the control adapter  10  to the control unit  12 , the press-maneuver parts  24 ,  25  are pressed from both left and right sides as in a squeezing manner. As a result, the engagement levers  44 ,  46  rotate in the engagement disengaging directions having the shafts  64 ,  66  serve as their respective centers.  
         [0059]    The engagement levers  44 ,  46 , which are biased against rotation by resisting the spring force of the torsion springs  48 ,  50 , can be rotated by overcoming the spring force, to a position where the arcuate groove portions  76 ,  78  make contact against the stoppers  72 ,  74 . In such an operation, the engagement levers  44 ,  46  can be prevented from deforming (bending), and a satisfactory pressing feel can be obtained during an engagement disengaging maneuver, since the stoppers  72 ,  74  are situated in the vicinity of the line along which the pressing forces upon the press-maneuver parts  24 ,  25  are directed.  
         [0060]    Pressing the press-maneuver parts  24 ,  25  in the aforedescribed manner, allows the engagement claws  38 ,  40  disposed at the tips of the engagement levers  44 ,  46 , to be in a position ready for insertion into the engagement holes  20 ,  21 , respectively, provided in the casing wall  14  of the control unit  12 . The user aligns the engagement claws  38 ,  40  with the engagement holes  20 ,  21 , which also positions the inserting connector  30  in a manner facing the receiving connector  22 .  
         [0061]    Subsequently, the user moves the control adapter device  10  toward the control unit  12  in direction A, thereby inserting the engagement claws  38 ,  40  into the engagement holes  20 ,  21 , respectively, and the inserting connector  30  into the receiving connector  22 .  
         [0062]    [0062]FIG. 7 is a side cross-sectional view showing a state after mounting the control adapter device  10  to the control unit  12 . As shown in FIG. 7, when the rear surface  36   e  of the control adapter device  10  contacts the casing wall  14  of the control unit  12 , the user can withdraw the force against the press-maneuver parts  24 ,  25 . As a result, the biasing forces of the torsion springs  48 ,  50  urge the engagement levers  44 ,  46  to return to engaged positions.  
         [0063]    Thus structured, the engagement claws  38 ,  40 , disposed on the tips of the engagement levers  44 ,  46  contact in a lateral direction and engage groove portions  20   a ,  21   a  of the casing wall  14  that form part of the engagement holes  20 ,  21 , respectively. Accordingly, by executing the foregoing engagement procedure, the control adapter  10  is attached to the casing wall  14  of the control unit  12  where the inserting connector  30  is engaged to the receiving connector  22 .  
         [0064]    Accordingly, the user presses the press-maneuver parts  24 ,  25 , and then, while having the engagement mechanisms  54  in the engagement disengaged (released) state, the user inserts the engagement claws  38 ,  40  into the engagement holes  20 ,  21 , while inserting the inserting connector  30  into the receiving connector  22 . Then, by releasing the pressing force on the press-maneuver parts  24 ,  25 , the mounting operation of the control adapter device  10  is completed.  
         [0065]    In detaching the mounted control adapter device  10  from the control unit  12 , the press-maneuver parts  24 ,  25  are pressed for separating the engagement claws  38 ,  40  from the groove portions  20   a ,  21   a , and then, having the engagement levers  44 ,  46  in a disengaged state, the control adapter  10  is withdrawn from the control unit  12 .  
         [0066]    Accordingly, the user presses the press-maneuver parts  24 ,  25  to achieve the engagement mechanisms  54  in an engagement disengaged state, and withdraws the control adapter device  10  from the control unit  12 , to thereby separate the engagement claws  38 ,  40  from the engagement holes  20 ,  21  and the inserting connector  30  from the receiving connector  22 . As a result, the separation procedure of the control adapter device  10  from the control unit  12  is completed.  
         [0067]    Next, an exemplary variation according to an embodiment of the present invention is described.  
         [0068]    [0068]FIG. 8 is an exploded perspective view showing a structure of an exemplary variation of a control adapter device according to an embodiment of the present invention. FIG. 9 is a perspective view showing an assembled state where the upper case  32  is removed according to the exemplary variation. It is to be noted that like parts (components) in FIGS. 8 and 9 are denoted by like numerals as of the aforementioned embodiment and will not be further explained.  
         [0069]    As shown in FIGS. 8 and 9, a control adapter  80  of the exemplary variation is provided with leaf springs  82 ,  84  instead of torsion springs  48 ,  50 .  
         [0070]    The leaf springs  82 ,  84  are disposed on the left and right in a symmetrical manner. One end portion  82   a ,  84   a  of the leaf springs  82 ,  84  is cut into a shape to be retained by the spring retaining portion  68 ,  70 , respectively, and the other end portion  82   b ,  84   b  of the leaf springs  82 ,  84  is bent into an upside-down U-letter shape to contact with respective side surface  86   a ,  88   a  situated at the rear side of arm portions  86 ,  88  that support the engagement claws  38 ,  40 . The leaf springs  82 ,  84 , which are processed by bending of a spring material, urge the engagement levers  44 ,  46 , respectively, toward an engagement position.  
         [0071]    The leaf springs  82 ,  84 , cooperate with the engagement levers  44 ,  46  in such a manner that the engagement levers  44 ,  46  are returnable to their engagement positions via the spring force of the respective springs. Moreover, the leaf springs  82 ,  84  require little installation space. Therefore, compact-sized engagement mechanisms  54  comprising the engagement levers  44 ,  46 , and the leaf springs  82 ,  84 , can be obtained.  
         [0072]    Next, the operation of the engagement mechanism  54  of the exemplary variation of the control adapter device  80  and the mounting operation of the control adapter device  80  are described.  
         [0073]    [0073]FIG. 10 is a side cross-sectional view showing a state before mounting the control adapter device  80 .  
         [0074]    As shown in FIG. 10, in mounting the control adapter  80  to the control unit  12 , the press-maneuver parts  24 ,  25  are pressed from both left and right sides as in a squeezing manner. As a result, the engagement levers  44 ,  46  rotate in the engagement disengaging direction having the shafts  64 ,  66  serve as their respective centers.  
         [0075]    The engagement levers  44 ,  46 , which are biased against rotation by resisting the spring force of the leaf springs  82 ,  84 , can be rotated to a position where the arcuate groove portions  76 ,  78  make contact against the stoppers  72 ,  74 . This allows the engagement claws  38 ,  40 , disposed at the tips of the engagement levers  44 ,  46 , to be in a position ready for insertion into the engagement holes  20 ,  21 , respectively, provided in the casing wall  14  of the control unit  12 . The user can align the engagement claws  38 ,  40  with the engagement holes  20 ,  21 , which also bring the inserting connector  30  into a position facing the receiving connector  22 .  
         [0076]    In such an operation, the engagement levers  44 ,  46  can be prevented from deforming (bending), and a satisfactory pressing feel can be obtained during an engagement disengaging maneuver, since the stoppers  72 ,  74  are situated at the vicinity of the line along which the pressing forces upon the press-maneuver parts  24 ,  25  are directed.  
         [0077]    Subsequently, the user moves the control adapter device  80  toward the control unit  12  in direction A, thereby inserting the engagement claws  38 ,  40  into the engagement holes  20 ,  21 , respectively, and the inserting connector  30  into the receiving connector  22 .  
         [0078]    [0078]FIG. 11 is a side cross-sectional view showing a state after mounting the control adapter device  80  to the control unit  12 . As shown in FIG. 11, when the rear surface  36   e  of the control adapter device  10  contacts the casing wall  14  of the control unit  12 , the user can withdraw the force against the press-maneuver part  24 ,  25 . As a result, the biasing force of the leaf springs  82 ,  84  urge the engagement levers  44 ,  46  to return to engaged positions.  
         [0079]    Thus structured, the engagement claws  38 ,  40 , disposed on the tips of the engagement levers  44 ,  46 , contact in a lateral direction and engage groove portions  20   a ,  21   a  of the casing wall  14  that form part of the engagement hole  20 ,  21 , respectively. Accordingly, the control adapter  10  is attached to the casing wall  14  of the control unit  12  where the inserting connector  30  is inserted to the receiving connector  22 .  
         [0080]    Although the foregoing embodiment has a pair of engagement mechanisms  54  disposed one on each the left and right sides of the control adapter device  10 , the control adapter device of the present invention is not limited only to such an embodiment. For example, the engagement mechanism  54  may be disposed on only one of the sides of the control adapter device  10 ,  80 .  
         [0081]    Furthermore, although the foregoing embodiment has the inserting connector  30  disposed on the rear surface of the control adapter device  10 ,  80  the control adapter device of the present invention is not limited only to such an embodiment. For example, the receiving connector  22  may be disposed on the rear surface of the control adapter device  10 ,  80 .  
         [0082]    Furthermore, although the foregoing embodiment has a transmission circuit provided on the substrate  42 , the control adapter device  10 ,  80  of the present invention is not to be limited only to such an embodiment. For example, a transmission circuit and a reception circuit may be provided on the substrate  42 .  
         [0083]    Further, the present invention is not limited to these embodiments, but various variations and modifications may be made without departing from the scope of the present invention.  
         [0084]    The present application is based on Japanese Priority Application No. 2003-76506 filed on Mar. 19, 2003, with the Japanese Patent Office, the entire contents of which are hereby incorporated by reference.