Patent Publication Number: US-10327529-B2

Title: Drawing device and control method for the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2015-128207, filed Jun. 26, 2015, the entire contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a drawing device and a control method for the drawing device. 
     2. Description of the Related Art 
     As a conventional technique, for example, according to JP 2000-194838 A, a technique is proposed in which a finger having a nail to be drawn is held in a drawing device which draws a nail design on a finger nail. 
     JP 2000-194838 A discloses a nail art device including a holder for locking a finger. The holder includes an actuation unit on which a finger is placed, and a pair of blade-shaped supporting members interlocking with movement of the actuation unit. When a user places a finger on the actuation unit, and the actuation unit is moved downward, a gap between a pair of the supporting members is reduced, and therefore the finger placed on the actuation unit is held by the pair of the supporting members. 
     However, the holder according to Patent Literature 1 is for mechanically holding a finger by operating such as the actuation unit and the supporting member. Therefore the holder has a complicated structure and has no concept to softly support the finger. 
     Therefore, a structure in which a cushion and a spring are arranged on a palm side of a finger inserted into a finger insertion portion, and movement of the finger is suppressed by pressing a portion other than a nail on a nail side (upper side) of the finger against an upper wall of the finger insertion portion by using a reaction force of the cushion and the spring. However, in this structure, a finger can easily move horizontally, and a nail design may not be finely drawn on a nail. 
     In view of the above state, an object of the present invention is to provide a drawing device and a control method for the drawing device capable of finely drawing a nail design on a nail by suppressing horizontal movement of a finger inserted into a finger insertion portion and certainly holding the finger. 
     SUMMARY OF THE INVENTION 
     The present invention is grasped by a configuration to be described below. 
     According to the present invention, a drawing device and a control method for the drawing device can be provided which can finely draw a nail design on a nail by suppressing horizontal movement of a finger inserted into a finger insertion portion and certainly holding the finger. 
     Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. 
         FIG. 1  is a perspective view illustrating an appearance of a drawing device according to an embodiment of the present invention; 
         FIG. 2  is a view of a housing cut on A-A line illustrated in  FIG. 1 ; 
         FIG. 3  is a plan view illustrating a structure around a first finger insertion portion according to the embodiment and a view illustrating a state in which a finger holding portion is shrunk; 
         FIG. 4  is a sectional view cut on B-B line illustrated in  FIG. 3 ; 
         FIG. 5  is a block diagram illustrating a fluid supply/discharge unit according to the embodiment; 
         FIG. 6  is a plan view illustrating a structure around the first finger insertion portion according to the embodiment and a view illustrating a state in which the finger holding portion is inflated; 
         FIG. 7  is a sectional view on C-C line illustrated in  FIG. 6 ; 
         FIG. 8  is a view describing a first variation of the finger holding portion according to the embodiment and a development view of the finger holding portion; 
         FIG. 9  is a plan view illustrating a structure around the first finger insertion portion including the finger holding portion illustrated in  FIG. 8  and a view illustrating a state in which the finger holding portion is shrunk; 
         FIG. 10  is a sectional view on D-D line illustrated in  FIG. 9 ; 
         FIG. 11  a view describing a second variation of the finger holding portion according to the embodiment, and a development view of the finger holding portion; and 
         FIG. 12  is a view on an arrow E illustrated in  FIG. 11  and a view describing a bending angle at a portion to be bent. 
     
    
    
     DESCRIPTION OF EMBODIMENT 
     With reference to attached drawings, an embodiment according to the present invention (hereinafter called “the embodiment”) will be described below. Same elements are denoted by same numbers through the entire description of the embodiment. 
     In the embodiment to be described below, a drawing device is described as a device which draws on a surface of a finger nail as a drawing target surface. However, the drawing target surface according to the present invention is not limited to the surface of a finger nail. For example, the drawing device draws on a toe nail as a drawing target surface. 
     (Overall Configuration of Drawing Device) 
     An embodiment of a drawing device according to the present invention will be described with reference to  FIGS. 1 to 5 . 
     As illustrated in  FIG. 1 , a drawing device  10  has a drawing function and provides a nail design on a nail  11  of user&#39;s finger  12 . The drawing device  10  includes a box-shaped housing  20 , and a display unit  21  and an operation unit  22  are provided on an upper surface (a top plate) of this housing  20 . Further an insertion opening  23   a  of a first finger insertion portion  23  is opened at a lower center of a front portion  20   a  of the housing  20 . Furthermore, an insertion opening  25   a  of a second finger insertion portion  25  is opened on a lower side of this first finger insertion portion  23 . The second finger insertion portion  25  is formed from the front portion  20   a  of the housing  20  toward an inner side in an insertion direction of the finger  12 , and the second finger insertion portion  25  is a space into which fingers other than the finger  12  to be drawn of one hand are inserted and also a space partitioned (not communicated) with an inner space of the housing  20 . 
     As illustrated in  FIG. 2 , a finger placing table  26  is provided on a lower portion in the housing  20 , and a finger holding case  30  is provided on an upper surface of the finger placing table  26 . The inner space in the finger holding case  30  is a space for forming the first finger insertion portion  23 , and a finger holding portion  60  is disposed in the space. 
     A fixed plate  17  is movably provided in the housing  20  in a device width direction and in a device depth direction. A drawing unit  14  including a pen plotter  13  and an ink jet unit  15  is fixed on one horizontal side (left side in this example) of the fixed plate  17 . A dryer  50  for drying ink, applied on the nail  11 , by using warm wind is fixed on another horizontal side (right side in this example). Further, an image acquisition unit  16  is provided between the drawing unit  14  and the dryer  50  to recognize a position and a form of the nail  11 .  FIG. 2  illustrates an inside of the device in the case where the pen plotter  13  is moved right above the opening  32  (to be described later) of the finger holding case  30 . 
     The pen plotter  13  includes a pen  13   a  which performs drawing on the nail  11 . The pen plotter  13  can integrally move with the fixed plate  17  in a device width direction and a device depth direction and move up and down by a driving unit  13   b  of such as a stepping motor. After the pen plotter  13  moves right above the opening  32  of the finger holding case  30 , a pen tip of the pen  13   a  moved down so as to come into contact with a surface of the nail  11  draws, for example, a base on the surface of the nail  11 . 
     The ink jet unit  15  includes an ink jet head  15   a  and an ink jet cartridge  15   b  and prints a nail design by using the ink jet head  15   a  on the nail  11 . The ink jet unit  15  can move integrally with the fixed plate  17  in a device width direction and a device depth direction, and the ink jet unit  15  moves right above the opening  32  of the finger holding case  30  and draws a desired design by using the ink jet head  15   a  on a surface of the nail  11 . 
     As illustrated in  FIG. 3 , the finger holding case  30  is fixed on the finger placing table  26  (refer to  FIG. 2 ), and the finger holding portion  60  is provided therein to suppress movement of a finger. 
     The finger holding case  30  includes a lower wall  33 , right/left side walls  36 R and  36 L, an upper wall  37 , an inner wall  38 , and a nail placing table  41 . The lower wall  33  is fixed on an upper surface of the finger placing table  26  (refer to  FIG. 2 ). The right/left side walls  36 R and  36 L are formed on an upper side from each of right and left ends of the lower wall  33 . The upper wall  37  is connected to an upper end of the right/left side walls  36 R and  36 L on a front side in a finger insertion direction (hereinafter simply called “a front side”). The inner wall  38  is connected to an end on a depth side in the finger insertion direction (hereinafter simply called “a depth side”) of the right/left side walls  36 R and  36 L. The nail placing table  41  is erected along an inner surface of the inner wall  38 , and a nail tip  11   a  on a tip side of the nail  11  is placed on the nail placing table  41 . Further, the opening  32  for exposing an entire tip portion of the finger or the toe including a region having the nail  11  of the inserted finger  12  is formed on an upper portion on a depth side of the finger holding case  30 .  FIG. 3  illustrates a state in which the nail  11  of the finger  12  inserted into the first finger insertion portion  23  of the finger holding case  30  is visible from an upper side through the opening  32 . The tip portion of the finger  12  may include from the tip of the finger  12  to around a distal interphalangeal joint of the finger  12 . 
     As illustrated in  FIG. 4 , the lower wall  33  includes a lower-side storage unit  33   a  recessed downward on an inner surface on a front side thereof. A through hole  33   b  is provided at a center of the lower-side storage unit  33   a . Each of the side walls  36 R and  36 L includes a side surface storage unit  36   a  recessed sideways on an inner surface on a depth side of the side walls  36 R and  36 L. The through hole  36   b  is provided at a center of the side surface storage unit  36   a.    
     The finger holding portion  60  includes a finger pressing portion disposed on an lower side in the first finger insertion portion  23  (hereinafter called a lower-side finger pressing portion  61 D (a third finger pressing portion), a finger pressing portion disposed on a left surface side in the first finger insertion portion  23  (hereinafter called a left-side finger pressing portion  61 L (a first finger pressing portion or a second finger pressing portion), and a finger pressing portion disposed on a right surface side in the first finger insertion portion  23  (hereinafter called a right-side finger pressing portion  61 R (the second finger pressing portion or the first finger pressing portion) (refer to  FIG. 3 ). 
     The finger holding portion  60  suppresses movement of the finger  12  by pressing a lower side surface and both side surfaces of the finger  12  by supplying fluid of such as air and inert gas to the three finger pressing portions (the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R), and also the finger holding portion  60  releases the pressing by discharging the supplied fluid. 
     (Configuration of Finger Holding Portion) 
     A configuration of each portion of the finger holding portion  60  and a configuration of a fluid supply/discharge unit  70  for supplying and discharging fluid to the finger holding portion  60  will be described later. 
     As illustrated in  FIG. 4 , the lower-side finger pressing portion  61 D is formed in a bag shape by a sheet, and for example, appearance thereof is formed in a square shape. In a finger insertion direction of the lower-side finger pressing portion  61 D, an end  61 D 1  on a depth side thereof is positioned on a depth side from an edge  32   a  positioned on a front side of the opening  32 , and an end  61 D 2  on the front side is positioned near a release portion  42  on a front side of the finger holding case  30 . A tubular fluid supply/discharge portion  62  is provided on a lower side of the lower-side finger pressing portion  61 D. The lower-side finger pressing portion  61 D is stored in the lower-side storage unit  33   a  while it is not used (in a state in which the portion is shrunk and flat before being inflated) and bonded to the lower-side storage unit  33   a  by a bonding member  63  (such as a double-sided tape) arranged so as to surround the fluid supply/discharge portion  62 . The fluid supply/discharge portion  62  of the lower-side finger pressing portion  61 D is inserted into the through hole  33   b  of the lower-side storage unit  33   a , and the fluid supply/discharge portion  62  is connected to a tube  65  connected to the fluid supply/discharge unit  70  (to be described later). 
     Returned to  FIG. 3 . As illustrated in  FIG. 3 , each of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R is formed in a bag shape by a sheet, and for example, appearance thereof is formed in a square shape. In the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R, ends  61 L 1  and  61 R 1  on a depth side of the portions are positioned near the inner wall  38 , and the ends  61 L 2  and  61 R 2  on a front side are positioned near an end on a depth side of the lower-side finger pressing portion  61 D when planarly viewed. The tubular fluid supply/discharge portion  62  is provided on a side surface on an outer side of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R. The left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are stored in the right/left side surface storage units  36   a  while those are not used (in a state in which the portions are shrunk and flat before being inflated) and bonded to the side surface storage unit  36   a  by the bonding member  63  (such as a double-sided tape) arranged so as to surround the fluid supply/discharge portion  62 . The fluid supply/discharge portions  62  of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are inserted into the through hole  36   b  of the side surface storage unit  36   a  and connected to the tube  65  connected to the fluid supply/discharge unit  70 . 
     Further, as illustrated in  FIG. 4 , the side surface storage unit  36   a  is disposed on an upper side on the side walls  36 L and  36 R, and therefore center portions of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are positioned on a upper side from a half in a vertical direction width W in the first finger insertion portion  23 . Specifically, in the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R, a center position C 1  in a vertical direction thereof is positioned on an upper side from a center position C 2  in the vertical direction of the first finger insertion portion  23 . 
     In the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R formed in this manner, at least portions positioned on a depth side are positioned on a depth side from the lower-side finger pressing portion  61 D. In this example, the whole of or the substantially whole of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R is disposed on a depth side from the lower-side finger pressing portion  61 D. 
     Examples of constituting materials of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R include each type of resin materials such as polyurethane and nylon, and also rubber materials such as elastic nitrile rubber, propylene rubber, silicone rubber, and natural rubber. Further, surfaces of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R are covered by elastic cloth. Therefore, texture in the case where the finger  12  comes into contact with the surfaces of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R is improved. 
     As illustrated in  FIG. 5 , the fluid supply/discharge unit  70  includes a pump  71 , a pressure sensor  72 , a purge valve  73 , and a manifold portion  75 . The pump  71  (for example, an air pump) inflates the finger holding portion  60  (the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R) by supplying fluid thereto. The pressure sensor  72  measures an air pressure in the finger holding portion  60 . The purge valve  73  (for example, an electromagnetic valve) is closed when the finger holding portion  60  is inflated and opened to discharge air when the finger holding portion  60  is shrunk. The manifold portion  75  is connected between the finger holding portion  60  and the pump  71 , and branches fluid toward the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R. 
     In the embodiment, by using the manifold portion  75 , the fluid supply/discharge unit  70  to the finger holding portion  60  (the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R) is commonly used. Three fluid supply/discharge unit  70  including the pump  71 , the purge valve  73 , and the pressure sensor  72  may be prepared and provided to each of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R. 
     (Operation of Finger Holding Portion) 
     Next, operation of the finger holding portion  60  will be described with reference to  FIGS. 6 and 7 . 
     As illustrated in  FIGS. 6 and 7 , in a state in which the finger  12  is inserted into the first finger insertion portion  23 , and the nail tip  11   a  is placed on the nail placing table  41 , the purge valve  73  (refer to  FIG. 5 ) is first closed by energizing the purge valve  73 . Next, while the pump  71  (refer to  FIG. 5 ) is energized, and simultaneously the pressure sensor  72  (refer to  FIG. 5 ) measures a pressure, fluid is sent to the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R via the manifold portion  75  (refer to  FIG. 5 ) and the tube  65 . Then, a pressure is applied to the inside of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R, and the portions are inflated until the pressure reaches to a desired pressure. When the pressure reaches to the desired pressure, the pump  71  is stopped, and when the pressure is lowered to the desired pressure or less, the pump  71  is driven again to supply fluid until the pressure becomes the desired pressure. Accordingly, the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R are maintained so as to stably inflate at a desired pressure. 
     The lower-side finger pressing portion  61 D presses a root side portion of the finger  12  so as to push up the portion by stably inflating at a desired pressure and suppresses movement in a vertical direction of the finger  12  by pushing a portion other than the nail  11  on an upper side of the finger  12  against an inner surface of the upper wall  37  (refer to  FIG. 7 ). On the other hand, the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R come into contact on horizontal both side surfaces on a tip side of the finger  12  by stably inflating at a desired pressure and suppresses movement in a horizontal direction of the finger  12  by pressing the tip side of the finger  12  so as to sandwich from the horizontal both sides (refer to  FIG. 6 ). Preferably, in a state in which the nail tip  11   a  is placed on the nail placing table  41 , movement of a distal interphalangeal joint of the finger  12  which is easily moved and all of movement of the finger  12  in vertical and horizontal directions can be suppressed by pressing at three points of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R so as to sandwich a region including the distal interphalangeal joint of the finger  12 . 
     At this time, in the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R, the center position C 1  in a vertical direction thereof is positioned on an upper side from the center position C 2  in a vertical direction of the first finger insertion portion  23 . Therefore, on horizontal both side surfaces on a tip side of the finger  12 , the tip side of the finger  12  is pressed obliquely downward to press an upper side of the finger  12  in comparison with a vertical center position of the finger  12 . Accordingly, it is prevented that the nail  11  is pressed upward and jumped out upward from the opening  32 . 
     As described above, movement of a finger in vertical and horizontal directions is suppressed by the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R. In a state in which the finger is firmly held in the first finger insertion portion  23 , a nail design is drawn on the nail  11  by the pen plotter  13  or the ink jet unit  15  through the opening  32 . 
     When the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R are shrunk after the nail design has been drawn on the nail  11 , the purge valve  73  is opened by cutting energization of the purge valve  73 , and the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R are shrunk and returned to an original flat shape by a restoring force of each of them and stored in the lower-side storage unit  33   a  and the right/left side surface storage units  36   a . Then, a pressing force to the finger  12  is released. 
     Effects of Embodiment 
     According to the embodiment described above, movement in a vertical direction and a horizontal direction of the finger  12  inserted into the first finger insertion portion  23  is suppressed, and the finger  12  is certainly held. Accordingly, a nail design can be finely drawn on the nail  11 . 
     Further, in the embodiment, the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are disposed on a depth side of the first finger insertion portion  23 , and the lower-side finger pressing portion  61 D is disposed on a front side of the first finger insertion portion  23 . If the lower-side finger pressing portion extends to the bottom on the tip side of a finger (right below the nail  11 ), the tip side of the finger  12  is lifted up on the tip side of the finger  12  by the lower-side finger pressing portion, and the pen  13   a  and the like may come into contact with the nail  11 . In this point, according to the embodiment, since the lower-side finger pressing portion  61 D is disposed on the front side of the first finger insertion portion  23 , the tip side of the finger  12  is lifted up, and it is prevented that the pen  13   a , the ink jet head  15   a , and the ink jet cartridge  15   b  come into contact with the nail  11 . 
     On the other hand, the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are positioned on a depth side of the lower-side finger pressing portion  61 D, and horizontal movement on a tip side of the finger  12  is stably suppressed. According to the embodiment, almost all of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are positioned on a depth side from the lower-side finger pressing portion  61 D. However, in the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R, the portions positioned on the depth side are at least positioned on a depth side from the lower-side finger pressing portion  61 D, and accordingly, horizontal movement on the tip side of the finger  12  can be stably suppressed. 
     Further, according to the embodiment, in the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R, the center position C 1  in a vertical direction thereof is disposed so as to be positioned on an upper side from the center position C 2  in a vertical direction of the first finger insertion portion  23 . On the other hand, in the case where the left-side finger pressing portion and the right-side finger pressing portion are disposed on a lower side from a center position in a vertical direction of the finger insertion portion, it is considered that when the left-side finger pressing portion and the right-side finger pressing portion are inflated, a finger is lifted up. In this case, the nail cannot be held at a desired height and may come into contact with such as a pen. In this point, according to the embodiment, the center position C 1  in vertical direction of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R presses upper side from the center position in a vertical direction of the finger  12 . Therefore, it is further prevented that the finger  12  is pressed sideways or downward and lifted up, and the nail  11  come into contact with such as the pen  13   a.    
     Further, the finger holding portion  60  holds the finger  12  by the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R, which are inflated by fluid. Therefore, in comparison with a conventional holder which mechanically holds a finger by operating an actuation unit and a supporting member, the finger holding portion  60  fits a shape of the finger  12 , and a finger holding structure can be provided in which the finger  12  can be softly and certainly held. Further, in comparison with a conventional holder, the finger holding portion  60  has an inexpensive and simple configuration and also can be reduced in size. Furthermore, a finger holding structure, which can be easily mounted, can be provided. 
     (Variation of Finger Holding Portion) 
     Next, a first variation of the finger holding portion according to the embodiment will be described with reference to  FIGS. 8 to 10 . 
     In the above-described finger holding portion  60  (refer to  FIG. 3 ), the fluid supply/discharge portion  62  is independently provided to each of three finger pressing portions (the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R) which are individually formed, and each fluid supply/discharge portion  62  is connected to the fluid supply/discharge unit  70  by the tube  65 . In addition, in the finger holding portion, the fluid supply/discharge portion may be provided to any one of the lower-side finger pressing portion, the left-side finger pressing portion, and the right-side finger pressing portion, and two finger pressing portions in which the fluid supply/discharge portion is not provided may be connected to the finger pressing portion, in which the fluid supply/discharge portion is provided, via fluid passages. 
       FIG. 8  is a view for describing the first variation of the finger holding portion and illustrates the finger holding portion developed entirely in a flat state. As illustrated in  FIG. 8 , for example, in the first variation, an integrated-type finger holding portion  80  is formed by which the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are connected to the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D via connection portions  81 L and  81 R (fluid passages). Further, the fluid supply/discharge portion  62  for supplying and discharging fluid is provided just to the lower-side finger pressing portion  61 D. 
     The left-side connection portion  81 L includes a first portion  81 L 1  and a second portion  81 L 2 . The first portion  81 L 1  is formed in a depth direction from a left side of the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D. The second portion  81 L 2  is connected to the left-side finger pressing portion  61 L by bending at a right angle in a left side direction from the first portion  81 L 1 . Further, the right side connection portion  81 R includes a first portion  81 R 1  and a second portion  81 R 2 . The first portion  81 R 1  is formed in a depth direction from a right side of the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D. The second portion  81 R 2  is connected to the right-side finger pressing portion  61 R by bending at a right angle in a right side direction from the first portion  81 L 1 . Each of the connection portions  81 L and  81 R include a portion to be bent  82 . In the portion to be bent  82 , the second portion  81 L 2  and  81 R 2  are bent at a right angle, and each of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R is erected. 
     As illustrated in  FIGS. 9 and 10 , each of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R erected at a right angle with respect to the lower-side finger pressing portion  61 D is stored in the side surface storage unit  36   a . The lower-side finger pressing portion  61 D is stored in the lower-side storage unit  33   a . Further, each of the connection portions  81 L and  81 R is stored in a depth side storage unit  83  extending in a further depth side from a depth side end of the lower-side storage unit  33   a . The lower-side storage unit  33   a , the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R are fixed on an inner side of the finger holding case  30  by the bonding member  63  (for example a double-side tape) as well as the above-described finger holding portion  60  (refer to  FIG. 3 ). 
     As illustrated in  FIGS. 9 and 10 , in the first variation, such as the through hole  36   b  of the side surface storage unit  36   a  illustrated in  FIG. 3  can be omitted. 
     In the first variation, fluid supplied to the lower-side finger pressing portion  61 D via the fluid supply/discharge portion  62  is supplied to the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R via each of the connection portions  81 L and  81 R, and accordingly each of the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R is inflated until reaching to a desired pressure. Vertical and horizontal movement of the finger  12  is suppressed by the lower-side finger pressing portion  61 D, the left-side finger pressing portion  61 L, and the right-side finger pressing portion  61 R, and a nail design is drawn on the nail  11  in a state in which the finger  12  is certainly held. Therefore, the finger holding portion  80  can obtain similar effects to the above-described finger holding portion  60  (refer to  FIG. 3 ). 
     In addition, in this first variation, the integrated-type finger holding portion  80  is used in which the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are connected to the lower-side finger pressing portion  61 D via the connection portions  81 L and  81 R. Therefore, the lower-side finger pressing portion  61 D and the fluid supply/discharge unit  70  are connected by one tube. Consequently, the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R do not need a fluid supply/discharge portion, and it is not necessary to connect the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R to the fluid supply/discharge unit  70  via a tube. Therefore, assembly is simple, and more inexpensive and compact finger holding portion  80  can be realized. 
     Next, a second variation of the finger holding portion according to the embodiment will be described with reference to  FIGS. 11 and 12 . 
       FIG. 11  is a view describing the second variation of the finger holding portion and illustrates the finger holding portion developed entirely in a flat state. As illustrated in  FIG. 11 , in the second variation as in the above-described first variation, an integrated-type finger holding portion  90  is formed by which the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are connected to the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D via connection portions  91 L and  91 R (fluid passages). Further, the fluid supply/discharge portion  62  for supplying and discharging fluid is provided just to the lower-side finger pressing portion  61 D. 
     The left-side connection portion  91 L includes a first portion  91 L 1  and a second portion  91 L 2 . The first portion  91 L 1  is formed in a depth direction from a left side of the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D. The second portion  91 L 2  is connected to the left-side finger pressing portion  61 L by bending in an oblique side against an extending direction of the first portion  91 L 1 . Further, the right side connection portion  91 R includes a first portion  91 R 1  and a second portion  91 R 2 . The first portion  91 R 1  is formed in a depth direction from a right side of the end  61 D 1  on a depth side of the lower-side finger pressing portion  61 D. The second portion  91 R 2  is connected to the right-side finger pressing portion  61 R by bending in an oblique right side against an extending direction of the first portion  91 R 1 . 
     Each of the connection portions  91 L and  91 R includes two or more portions to be bent  92  to erect each of the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R. In the variation, total two portions to be bent  92  are provided to each of the connection portions  91 L and  91 R in a middle of the first portions  91 L 1  and  91 R 1  and in a middle of the second portions  91 L 2  and  91 R 2 . 
     In the finger holding portion  90 , the connection portions  91 L and  91 R are bent twice at the two portions to be bent  92  such that the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R are vertically erected with respect to the lower-side finger pressing portion  61 D (so as to be disposed on a left surface side and a right surface side on a depth side of the first finger insertion portion  23 ). In this manner, a bending angle θ1 (refer to  FIG. 12 ) at each portion to be bent  92  becomes gentle. Therefore, when fluid is discharged from the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R which are inflated, the fluid pass through the connection portions  91 L and  91 R bent at a gentle angle. 
     On the other hand, for example, in the above-described finger holding portion  80  (refer to  FIG. 8 ), a bending angle of the portion to be bent  82  becomes a right angle at the connection portions  81 L and  81 R, and therefore, fluid may not be easily discharged by passing through the connection portions  81 L and  81 R depending on a configuration of the finger holding portion  80  and a type of the fluid. 
     In this point, according to the second variation, fluid passes through the connection portions  91 L and  91 R bending at a gentle angle, and therefore the fluid can be satisfactory and immediately discharged from the left-side finger pressing portion  61 L and the right-side finger pressing portion  61 R. A bending angle θ (refer to  FIG. 12 ) of the connection portions  91 L and  91 R gently bent at the portion to be bent  92  is preferably equal to or greater than 135° (less than 180°). 
     The preferable embodiment according to the present invention has been described above. However, the present invention is not limited to the specific embodiment, and the invention described in Claims and a scope equivalent thereto are included in the present invention. Hereinafter, the invention described in initial Claims of the application will be appended.