Abstract:
The input device and detection device each comprise separate electrodes comprised of an electrode for detecting input in a vertical direction and a plurality of electrodes for detecting input in a horizontal direction and arranged separately on the surface, an elastic body which faces the above separate electrodes with a predetermined space therebetween, at least a portion opposite to the separate electrodes having conductivity, a thin portion being provided opposite to the electrode for detecting input in a vertical direction, a storage depressed portion being formed on the thin portion, and the space between the elastic body and the separate electrodes changing by input, a slider connected to the elastic body and movable only in a horizontal direction, a hard pressing body stored in the storage depressed portion of the elastic body, and a key top whose portion opposite to the pressing body is movable in a vertical direction, wherein when the slider is moved in a horizontal direction, the elastic body deforms and the space between the conductive portion of the elastic body and the electrodes for detecting input in a horizontal direction changes, and when the key top is pressed, the thin portion of the elastic body deforms through the pressing body and the space between the thin portion and the electrode for detecting input in a vertical direction changes.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to an input device for use in personal computers and remote controllers and to a detection device for use in accelerometers and, particularly, to a capacitance change-based input device and detection device.  
           [0003]    2. Description of the Prior Art  
           [0004]    Various input devices which make use of a change in capacitance have been proposed as an input device and detection device (both to be referred to as “input device” hereinafter) for inputting and detecting the physical amount of force or the like in such industries as auto industry, electric industry, machine industry and engineering industry because they do not need temperature compensation.  
           [0005]    However, as this type of input devices cannot distinguish horizontal direction (X and Y directions) force applied to an operation unit from vertical direction (Z direction) force applied to the operation unit, they have such a defect as low input accuracy when the operation unit is pressed obliquely.  
         SUMMARY OF THE INVENTION  
         [0006]    It is an object of the present invention to provide an input device and a detection device which eliminate the above defect of the prior art and have high input accuracy (detection accuracy) and excellent handling ease.  
           [0007]    According to a first aspect of the present invention, there are provided a capacitance change-based input device and detection device, each comprising:  
           [0008]    separate electrodes comprised of a first electrode for detecting input in a vertical direction and a plurality of electrodes, for example, second to fifth electrodes for detecting input in a horizontal direction and arranged separately on the surface;  
           [0009]    an elastic body which faces the above separate electrodes with a predetermined space therebetween, at least a portion opposite to the separate electrodes having conductivity, a thin portion being provided opposite to the electrode for detecting input in a vertical direction, a storage depressed portion being formed on the thin portion, and the space between the elastic body and the separate electrodes changing by input;  
           [0010]    a slider connected to the elastic body and movable only in a horizontal direction;  
           [0011]    a hard pressing body stored in the storage depressed portion of the elastic body; and  
           [0012]    a key top whose portion opposite to the pressing body is movable at least in a vertical direction, wherein  
           [0013]    when the slider is moved in a horizontal direction, the elastic body deforms and the space between the conductive portion of the elastic body and the electrodes for detecting input in a horizontal direction changes, and when the key top is pressed, the thin portion of the elastic body deforms through the pressing body and the space between the thin portion and the electrode for detecting input in a vertical direction changes.  
           [0014]    According to a second aspect of the present invention, there are provided a capacitance change-based input device and detection device each of which has a tension application means such as an annular projection, or cutout portion or inclined portion to apply tension to the elastic body.  
           [0015]    According to a third aspect of the present invention, there are provided a capacitance change-based input device and detection device, wherein a connection portion between the elastic body and the slider is covered with the key top.  
           [0016]    According to a fourth aspect of the present invention, there are provided a capacitance change-based input device and detection device, each comprising:  
           [0017]    separate electrodes comprised of a first electrode for detecting input in a vertical direction and a plurality of electrodes, for example, second to fifth electrodes for detecting input in a horizontal direction and arranged separately on the surface;  
           [0018]    an elastic body which faces the above separate electrodes with a predetermined space therebetween, at least a portion opposite to the separate electrodes having conductivity, and the space between the elastic body and the electrodes changing by input;  
           [0019]    a slider connected to the elastic body and movable only in a horizontal direction; and  
           [0020]    a key top whose portion opposite to the electrode for detecting input in a vertical direction is movable in a vertical direction through the elastic body, wherein  
           [0021]    when the slider is moved in a horizontal direction, the elastic body deforms and the space between the conductive portion of the elastic body and the electrodes for detecting input in a horizontal direction changes, and when the key top is pressed, the elastic body deforms and the space between the conductive portion of the elastic body and the electrode for detecting in a vertical direction changes.  
           [0022]    According to a fifth aspect of the present invention, there are provided a capacitance change-based input device and detection device each of which has a tension application means such as an annular projection, or cutout portion or inclined portion is provided to apply tension to the elastic body.  
           [0023]    According to a sixth aspect of the present invention, there are provided a capacitance change-based input device and detection device, wherein a connection portion between the elastic body and the slider is covered with the key top.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0024]    [0024]FIG. 1 is a sectional view of an input device according to a first embodiment of the present invention;  
         [0025]    [0025]FIG. 2 is a perspective view of the above input device;  
         [0026]    [0026]FIG. 3 is an exploded perspective view of the above input device;  
         [0027]    [0027]FIG. 4 is a sectional view of an elastic body used in the above input device;  
         [0028]    [0028]FIG. 5 is a plan view of a printed wiring board used in the above input device;  
         [0029]    [0029]FIG. 6 is a sectional view of the above printed wiring board;  
         [0030]    [0030]FIG. 7 is a sectional view of an elastic body used in a second embodiment of the present invention;  
         [0031]    [0031]FIG. 8 is a sectional view of an elastic body used in a third embodiment of the present invention;  
         [0032]    [0032]FIG. 9 is a sectional view of key parts of an input device according to a fourth embodiment of the present invention;  
         [0033]    [0033]FIG. 10 is a sectional view of key parts of an input device according to a fifth embodiment of the present invention;  
         [0034]    [0034]FIG. 11 is a sectional view of an input device according to a sixth embodiment of the present invention;  
         [0035]    [0035]FIG. 12 is a plan view of a printed wiring board used in the above input device;  
         [0036]    [0036]FIG. 13 is a sectional view of the above printed wiring board;  
         [0037]    [0037]FIG. 14 is a sectional view of an input device according to a seventh embodiment of the present invention;  
         [0038]    [0038]FIG. 15 is a perspective view of the above input device;  
         [0039]    [0039]FIG. 16 is an exploded perspective view of the above input device;  
         [0040]    [0040]FIG. 17 is a sectional view of an input device according to an eighth embodiment of the present invention;  
         [0041]    [0041]FIG. 18 is a sectional view of an elastic body used in the above input device;  
         [0042]    [0042]FIG. 19 is a sectional view of an input device according to a ninth embodiment of the present invention;  
         [0043]    [0043]FIG. 20 is a perspective view of a personal computer comprising the input device according to the above embodiment of the present invention;  
         [0044]    [0044]FIG. 21 is a partial side view showing the operation state of the input device in the above personal computer; and  
         [0045]    [0045]FIG. 22 is a plan view of a remote controller comprising the input device according to the embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0046]    Preferred embodiments of the present invention will be described hereinafter with reference to FIGS.  1  to  6 . FIG. 1 is a sectional view of an input device, FIG. 2 is a perspective view of the input device, FIG. 3 is an exploded perspective view of the input device, FIG. 4 is a sectional view of an elastic body used in the input device, FIG. 5 is a plan view of a printed wiring board, and FIG. 6 is a sectional view of the printed wiring board.  
         [0047]    The input device is essentially comprised of a key top  1 , slider  2 , housing  3  made of a metal plate, bracket  4  made of a metal plate, pressing body  5 , elastic body  6 , a support member  7  made of a synthetic resin molded product and printed wiring board  8 .  
         [0048]    The key top  1  is molded to a shape shown in FIG. 1 from an elastic material such as rubber or elastomer and an input operation surface  9  which is greatly depressed in a circular arc is formed on the center portion of the top surface. As shown in FIG. 1, a projection portion  10  which is thinner than the peripheral portion and can move vertically is provided on the center portion in such a manner that it faces down and a lower end side wall  11  is mated with the slider  2 .  
         [0049]    The slider  2  is molded from a hard synthetic resin, a hole  12  which mates with the head portion of the elastic body  6  is formed in the center portion, and a connection portion between this slider  2  and the elastic body  6  is covered with the key top  1  mounted to the top of the slider  2 . A flange portion  13  provided at the periphery of the slider  2  is sandwiched between the bracket  4  and the upper end bent portion  8  of the housing  3  in such a manner that it can slide. Therefore, the slider  2  is arranged such that it can move in a horizontal direction (X and Y directions), the key top  1  can move in a horizontal direction (X and Y directions) together with the slider  2 , and the center portion (projection portion  10 ) can move in a vertical direction (Z direction).  
         [0050]    The elastic body  6  comprised of an elastic main body  6   a  which is relatively thick and has no conductivity and a conductive elastic body  6   b  arranged under the elastic main body  6   a . The both members are integrated with each other by such means as two-color molding or adhesion. As shown in FIG. 4, a storage depressed portion  15  having a larger inner diameter than the outer diameter of the pressing body  5  is formed in the center portion of the elastic main body  6   a  and a thin portion  16  is formed at the bottom of the storage depressed portion  15  to store the pressing body  5  in the storage depressed portion  15  such that it can move vertically. The pressing body  5  is made from a hard material such as a hard synthetic resin or metal and columnar in shape.  
         [0051]    The conductive elastic body  6   b  is made from an elastic material such as rubber or elastomer containing conductive fine particles such as silver or carbon black dispersed therein, and an annular projection  17  larger in diameter than the thin portion  16  projects downward and slightly more than the peripheral portion  18  of the conductive elastic body  6   b.    
         [0052]    The peripheral portion  18  of the elastic body  6  (conductive elastic body  6   b ) is fixed and positioned to the printed wiring board  8  by adhesion or the like, the annular projection  17  of the conductive elastic body  6   b  is press contacted to the top surface of the printed wiring board  8 , and a space  19  is maintained between the conductive elastic body  6   b  and the printed wiring board  8  while tension is applied to the conductive elastic body  6   b.    
         [0053]    On the top surface of the hard printed wiring board  8  made from glass-epoxy resin, as shown in FIG. 5, a first electrode  20   a  is formed at the center, a second electrode  20   b , third electrode  20   c , fourth electrode  20   d  and fifth electrode  20   e  are formed around the first electrode  20   a , a gland electrode  20   f  is provided around the above electrodes, all the above electrodes  20  are covered with a soft insulating film  21  for maintaining a space therebetween as shown in FIG. 6, and the areas of the second to fifth electrodes  20   b  to  20   e  are equal to one another. In FIG. 1, the electrodes  20  and the insulating film  21  are omitted to simplify the illustration.  
         [0054]    Application examples of the input device will be described later. In this embodiment, the second electrode  20   b  is for moving a cursor on a display in an upward direction, the third electrode  20   c  for moving the cursor in a downward direction, the fourth electrode  20   d  for moving the cursor in a left direction, and the fifth electrode  20   e  for moving the cursor in a right direction. The second to fifth electrodes  20   b  to  20   e  are for inputting data in a horizontal direction (X and Y directions). The first electrode  20   a  is used to confirm the input direction and to input data in a vertical direction (Z direction).  
         [0055]    A conductive pattern  22  having a predetermined shape is provided on the under surface of the printed wiring board  8  and the above electrodes  20  are electrically connected to the conductive pattern  22  by through holes  23 . An electronic part such as an IC chip  24  is mounted on the conductive pattern  22 , a flexible printed wiring board  25  is connected to one end of the conductive pattern  22 , and the other end of the flexible printed wiring board  25  is connected to the input/output interface (not shown) of an apparatus in use.  
         [0056]    A description is given of the operation of this input device. In a stand-by mode (initial state) where force is not applied to the key top  1 , spaces between the conductive elastic body  6   b  and the electrodes  20   b  to  20   e  on the printed wiring board  8  are equal to one another and capacitances between the conductive elastic body  6   b  and the electrodes  20   b  to  20   e  are therefore equal to one another. Since tension is applied to the conductive elastic body  6   b , the pressing body  5  in the storage depressed portion  15  of the elastic main body  6   a  is lifted by the tension of the conductive elastic body  6   b  and contacts or approaches the projection portion  10 , and a predetermined space  19  is maintained between the center portion of the conductive elastic body  6   b  and the first electrode  20   a.    
         [0057]    Since the flange portion  13  of the slider  2  which is mated with the key top  1  is sandwiched between the bracket  4  and the upper end bent portion  14  of the housing  3  as described above, the peripheral portion (slider  2 ) of the key top  1  is prevented from moving in a vertical direction (Z direction) and allowed to move only in a horizontal direction (X and Y directions).  
         [0058]    When the key top  1  is moved to the left in FIG. 1, for example, this movement is transmitted to the elastic body  6  through the slider  2 , the elastic body  6  is elastically deformed, the space between the conductive elastic body  6   b  and the second electrode  20   b  is narrowed from the initial state by this deformation, a chance in capacitance on the second electrode  20   b  side is electrically detected, and the input of a signal for moving the cursor in a left direction by means of the key top  1  can be detected.  
         [0059]    When the key top  1  is moved to the right in FIG. 1, for example, this movement is transmitted to the elastic body  6  through the slider  2 , the elastic body  6  is elastically deformed, the space between the conductive elastic body  6   b  and the fifth electrode  20   e  is narrowed from the initial state by this deformation, a change in capacitance on the fifth electrode  20   e  side is electrically detected, and the input of a signal for moving the cursor in a right direction by means of the key top  1  can be detected.  
         [0060]    When the center portion (projection portion  10 ) of the key top  1  is pressed down by the finger in a vertical direction (Z direction), the center portion of the conductive elastic body  6   b  is directly pressed by the pressing body  5 , the space between the first electrode  13   a  and the conductive elastic body  6   b  is narrowed from the initial state, a change in capacitance is electrically detected, and a signal is input. When operation force applied to the key top  1  is removed, the key top  1 , slider  2 , pressing body  5  and elastic body  6  are returned to the original stand-by mode by the restoring force of the elastic body  6 .  
         [0061]    [0061]FIG. 7 is a sectional view of the elastic body  6  used in a second embodiment. The difference of the elastic body  6  from the elastic body  6  of a first embodiment is that the thin portion  16  is not provided on the elastic main body  6   a , a hole is formed in the elastic main body  6   a , and an opening at the lower end of the hole is covered by the center portion of the conductive elastic body  6   b  to form the storage depressed portion  15 .  
         [0062]    [0062]FIG. 8 is a sectional view of the elastic body  6  used in a third embodiment. The whole elastic body  6  is comprised of the conductive elastic body  6   b  and the storage depressed portion  15  and the thin portion  16  are formed at the center portion. In this example, the annular projection  17  is not provided on the elastic body  6  and an annular projection  26  slightly larger in diameter than the thin portion  16  is formed on the printed wiring board  8 . The annular projection  26  is designed to be slightly larger in height than the inner level difference of the peripheral portion  18  of the conductive elastic body  6   b  and press contacted to the under surface of the conductive elastic body  6   b  when the device is assembled to apply appropriate tension to the conductive elastic body  6   b.    
         [0063]    The formation of the annular projection  26  on the printed wiring board  8  is applicable to the first and second embodiments.  
         [0064]    [0064]FIG. 9 is a sectional view of key parts of an input device according to a fourth embodiment. An inclined or round cutout portion  27  is formed at the periphery of the under surface of the elastic body  6 . When this elastic body  6  is set in the device, the cutout portion  27  is smashed by pressing force at the time of assembly (FIG. 9 does not illustrate the smashed cutout portion  27 ), whereby tension (stress) is generated in the elastic body  6 .  
         [0065]    [0065]FIG. 10 is a sectional view of key parts of an input device according to a fifth embodiment. A wide-angle inclined portion  28  whose diameter increases toward the upper end is formed on the end portion of the top surface of the elastic body  6 , and a V-shaped bent pressing portion  40  is provided on a pressing member such as the bracket  4  to press the inclined portion  28  outward in a radial direction. The inclined portion  28  is pressed outward in a radial direction by the pressure of this pressing portion  40  to generate tension (stress) in the elastic body  6 .  
         [0066]    A description is subsequently given of a sixth embodiment of the present invention with reference to the accompanying drawings. FIG. 11 is a sectional view of an input device, FIG. 12 is a plan view of a printed wiring board and FIG. 13 is a sectional view of the printed wiring board.  
         [0067]    The input device is essentially comprised of a slider  69  which also serves as a key top, key top  51 , housing  52  made of a metal plate, a support member  53  made of a synthetic resin molded product, elastic body  54  and printed wiring board  55 .  
         [0068]    The slider  69  is molded to a shape shown in FIG. 11 from a hard synthetic resin, a hole  56  which mates with the head portion  59  of the key top  51  is formed in the center portion, and a flange portion  57  at the periphery is mounted on the support member  53  such that it can move in a horizontal direction (X and Y directions) between the upper end bent portion  58  of the housing  52  and the support member  53 .  
         [0069]    The key top  51  is molded to a shape shown in FIG. 11 from an elastic material such as rubber or elastomer, and the head portion  59  is exposed to the outside from the hole  56  and mated with the elastic body  54 . The key top  51  can move in a horizontal direction (X and Y directions) together with the slider  69  and can move alone in a vertical direction (Z direction).  
         [0070]    The elastic body  54  comprised of an elastic main body  54   a  which is relatively thick and has no conductivity and a conductive elastic body  54   b  which is arranged under the elastic main body  54   a . The both members are integrated with each other by such means as two-color molding or adhesion. The conductive elastic body  54   b  is made from an elastic material such as rubber or elastomer containing conductive fine particles such as silver or carbon dispersed therein. The peripheral portion  60  of the elastic body  54  is fixed or positioned to a printed wiring board  55  by adhesion or the like, a projection  61  for applying tension which is contacted to the printed wiring board  55  is provided at the center of the under surface of the conductive elastic body  54   b , and a space  62  is formed between the conductive elastic body  54   b  and the printed wiring board  55  by the peripheral portion  60  and the projection  61 .  
         [0071]    On the top surface of the hard printed wiring board  55  made from glass-epoxy resin, for example, as shown in FIG. 12, a first electrode  63   a  is formed at the center, second electrode  63   b , third electrode  63   c , fourth electrode  63   d  and fifth electrode  63   e  are formed around the first electrode  63   a , and a gland electrode  63   f  is provided around the above electrodes, and the above electrodes  63  are covered with a soft insulating film  64  for maintaining a space therebetween as shown in FIG. 13, and the areas of the second to fifth electrodes  63   b  to  63   e  are equal to one another.  
         [0072]    In the sixth embodiment, the second electrode  63   b  is for moving the cursor on the display in an upward direction, the third electrode  63   c  for moving it in a downward direction, the fourth electrode  63   d  for moving it in a left direction, and the fifth electrode  63   e  for moving it in a right direction. The second to fifth electrodes  63   b  to  63   e  are for inputting data in a horizontal direction (X and Y directions). The first electrode  63   a  is used to confirm the input direction and to input data in a vertical direction (Z direction).  
         [0073]    A conductive pattern  65  having a predetermined shape is provided on the under surface of the printed wiring board  55  and the above electrodes  63  are electrically connected to the conductive pattern  65  by through holes  66 . An electronic part such as an IC chip  67  is mounted on the conductive pattern  65 , a flexible printed wiring board  68  is connected to one end of the conductive pattern  65 , and the other end of the flexible printed wiring board  68  is connected to the input/output interface (not shown) of an apparatus in use.  
         [0074]    A description is given of the operation of this input device. In a stand-by mode (initial state) where force is not applied to the key top  51  and the slider  69 , spaces between the conductive elastic body  54   b  and the electrodes  63   b  to  63   e  on the printed wiring board  55  are equal to one another and capacitances between the conductive elastic body  54   b  and the electrodes  63   b  to  63   e  are therefore equal to one another.  
         [0075]    Since the flange portion  57  of the slider  69  is sandwiched between the support member  53  and the upper end bent portion  58  of the housing  52  when the slider  69  is operated, the slider  69  is prevented from moving in a vertical direction (Z direction) and allowed to move only in a horizontal direction (X and Y directions).  
         [0076]    When the slider  69  is moved to the left in FIG. 11, for example, this movement is transmitted to the elastic body  54  through the key top  51 , the elastic body  54  is elastically deformed slightly, the space between the conductive elastic body  54   b  and the third electrode  63   c  is narrowed from the initial state by this deformation, a chance in capacitance on the third electrode  63   c  side is electrically detected, and the input of a signal for moving the cursor in a left direction by means of the slider  69  can be detected.  
         [0077]    When the slider  69  is moved to the right in FIG. 11, for example, the elastic body  54  is elastically deformed slightly by this movement, the space between the conductive elastic body  54   b  and the fifth electrode  63   e  is narrowed from the initial state, a change in capacitance on the fifth electrode  63   e  side is electrically detected, and the input of a signal for moving the cursor in a right direction by means of the slider  69  can be detected.  
         [0078]    When the key top  51  is pressed in a vertical direction (Z direction) by the finger in FIG. 11, the slider  69  is kept at that position and only the key top  51  is moved down. The space between the first electrode  63   a  and the conductive elastic body  54   b  is narrowed from the initial state, a change in capacitance is electrically detected, and a signal is input by the key top  51 . When operation force applied to the key top  51  and the slider  69  is removed, the key top  51 , slider  69  and elastic body  54  are returned to the original standby mode by the restoring force of the elastic body  54 .  
         [0079]    FIGS.  14  to  16  are for explaining an input device according to a seventh embodiment. FIG. 14 is a sectional view of the input device, FIG. 15 is a perspective view of the input device and FIG. 16 is an exploded perspective view of the input device.  
         [0080]    The input device is essentially comprised of a key top  51 , housing  52 , a support member  53 , elastic body  54 , printed wiring board  55 , slider  69  and bracket  70 .  
         [0081]    The key top  51  is molded to a shape shown in FIG. 14 from an elastic material such as rubber or elastomer and an input operation surface  71  which is greatly depressed in a circular arc is formed on the center portion of the top surface. As shown in FIG. 14, a projection portion  72  which is thinner than the peripheral portion and can move vertically is provided on the center portion in such a manner that it faces down and a lower end side wall  73  is mated with the slider  69 .  
         [0082]    The slider  69  is molded from a hard synthetic resin, a hole  74  which mates with the head portion of the elastic body  54  is formed in the center portion, and a connection portion between this slider  69  and the elastic body  54  is covered with the key top  51  mounted to the top of the slider  69 . A flange portion  57  provided at the periphery of the slider  69  is sandwiched between the bracket  70  and the upper end bent portion  58  of the housing  52  in such a manner that it can slide.  
         [0083]    The whole elastic body  54  has conductivity and its head portion exposes from the hole  74  of the slider  69  and contacts or approaches the projection portion  72  of the key top  51  so that the elastic body  54  is fixed to a predetermined position of the printed wiring board  55 . As shown in FIG. 19, first to fifth electrodes  63   a  to  63   e  and a gland electrode  63   f  are provided on the printed wiring board  55  and the first to fifth electrodes  63   a  to  63   e  face the under surface of the elastic body  54  with a space  62  therebetween.  
         [0084]    When the key top  51  of this input device is operated, the peripheral portion (slider  69 ) of the key top  51  is prevented from moving in a vertical direction (Z direction) and allowed to move only in a horizontal direction (X and Y directions) because the flange portion  57  of the slider  69  which mates with the key top  51  is sandwiched between the bracket  70  and the upper end bent portion  58  of the housing  52 .  
         [0085]    When the key top  51  is moved in a horizontal direction, this movement is transmitted to the elastic body  54  through the slider  69 , the elastic body  54  is elastically deformed, the spaces  62  between the elastic body  54  and some of the second to fifth electrodes  63   b  to  63   e  are changed by this deformation, a change in capacitance is electrically detected, and a detection signal can be input.  
         [0086]    When the center portion (projection portion  72 ) of the key top  51  is pressed in a vertical direction (Z direction) by the finger, the center portion of the elastic body  54  is pressed without the slider  69 , the space between the first electrode  63   a  and the elastic body  54  is narrowed from the initial state, a change in capacitance is electrically detected, and a detection signal is input.  
         [0087]    [0087]FIG. 17 and FIG. 18 are for explaining an input device according to an eighth embodiment. FIG. 17 is a sectional view of the input device and FIG. 18 is a sectional view of an elastic body before it is set in the input device. The difference between the eighth embodiment and the seventh embodiment is the shape of the elastic body.  
         [0088]    That is, a projection portion  61  is provided on the center portion of the under surface of the elastic body  54  and projects down slightly more than the peripheral portion  60 . When the elastic body  54  is set in the device, the projection portion  61  is pressed and deformed by the printed wiring board  55  and the peripheral portion  60  is fixed to the printed wiring board  55  in this state, thereby generating tension (stress) shown by an arrow F in the elastic body  54 .  
         [0089]    Although the elastic body  54  is elastically deformed by operation force, as distortion remains in the elastic body  54 , when operation force is very small, it may be offset with the residual distortion and an appropriate signal may not be input. When tension (stress) is applied to the elastic body  54  as in this embodiment, even if operation force is very small, an appropriate signal can be input. The projection portion  61  provided on the conductive elastic body  54   b  shown in FIG. 11 takes part in the application of tension (stress) to the conductive elastic body  54   b.    
         [0090]    [0090]FIG. 19 is for explaining an input device according to a ninth embodiment. In this embodiment, an inclined or round cutout portion  76  is provided at the periphery of the under surface of the elastic body  54 . When this elastic body  54  is set in the device, the cutout portion  76  is smashed by pressure at the time of assembly (FIG. 19 does not illustrate the smashed cutout portion  76 ), thereby generating tension (stress) F in the elastic body  54 . Since tension (stress) F is generated in the elastic body  54  by the cutout portion  76 , the thickness of the peripheral portion of the elastic body  54  is designed to be larger than the thickness of the support member  53  by the smashed portion of the cutout portion  76 .  
         [0091]    [0091]FIG. 20 and FIG. 21 show a first application example of the input device in a mobile personal computer or a notebook personal computer. The personal computer  80  comprises a personal computer body  82  having a large number of key board switches  81  and a cover member  84  having a display portion  83 , and the cover member  84  is attached to the personal computer body  82  such that it can move. The above input device  85  is incorporated in the end portion of the cover member  84  as an input pointer. In this example, the input device  85  is incorporated in the cover member  84  but can be incorporated in the personal computer body  82 .  
         [0092]    [0092]FIG. 21 shows the operation state of the input device  85 . A cursor on the display portion  83  can be moved by sandwiching the input device  85  between the thumb  86  and another finger  87  and moving the thumb  86  vertically and horizontally.  
         [0093]    [0093]FIG. 22 shows a second application example of the input device in a remote controller for a mobile personal computer or notebook personal computer for domestic use. The above input device  85  as an input pointer, switch  89  and scroll dial  90  are incorporated in a remote control body  88 . While the remote controller for a personal computer has been described in this example, the present invention can be applied to a remote controller for other apparatus.  
         [0094]    Although the input device is used in a personal computer in the above examples, it may be used in such fields as electric appliances, car equipment, measuring instruments and medical appliances.  
         [0095]    Although five different separate electrodes are used in the above embodiments, the number of separate electrodes may be smaller than that in the above embodiments.  
         [0096]    While the input device has been described in the above embodiments, the present invention is not limited to this and is applicable to a detection device for detecting deformation as a change in capacitance by installing a detector on a portion corresponding to the key top or slider of the input device in such a manner it can move (slide or rotate), moving the detector by action force (force, magnetic force or wind force) from an object to be detected, and deforming an elastic body by this movement.  
         [0097]    Since the present invention is constituted as described above, comprises a slider movable only in a horizontal direction, a key top movable in a vertical direction and a pressing body and clearly distinguishes input in a horizontal direction from input in a vertical direction, and the pressing body is hard, it can provide an input device and a detection device which have high input accuracy (detection accuracy) and excellent handling ease.  
         [0098]    Since the present invention has a tension application means of applying tension to the elastic body, input can be made with small force and input accuracy (detection accuracy) can be further improved.  
         [0099]    Since the connection portion between the elastic body and the slider is covered with the top key in the present invention, dust does not adhere to or enter the connection portion, thereby making it possible to improve operation reliability.