Patent Publication Number: US-8979092-B2

Title: Luminous dart board set

Description:
TECHNICAL FIELD 
     The present invention relates to a luminous dart board set. 
     BACKGROUND ART 
     A dart board set generally includes a circular dart board and a dart pin thrown at the dart board, and is a game board for scoring according to the position of the dart pin stuck into the dart board when a player throws the dart pin toward the front face of the dart board. 
     Conventionally, the dart pin includes a sharp pin, which is made of a metal material and is disposed at the front side, and the dart board is made of soft cork so that the dart pin can be stuck into the dart board, and hence, the conventional dart board set has a problem in that the front face of the dart board is gradually damaged by the dart pin because holes are formed at portions where the dart pin is stuck in the case that the dart board set is well-used. 
     Accordingly, recently, dart board sets including a dart pin having a magnet embedded in the front side of the dart pin and a dart board having an iron plate or an iron rubber sheet attached to the front face thereof have been disclosed. Such dart board sets can prevent the dart board from being damaged even though it is used for a long time and prevent players from being injured by the sharp dart pin. 
     Such a dart board set having the magnetic dart pin includes: a circular dart board of an iron plate or an iron rubber sheet having concentric scoring sections indicated on the front face thereof; and a dart pin having a magnet embedded at the front side thereof so that the dart pin is attached to the front face of the dart board. Accordingly, the player can enjoy a dart game while scoring according to positions of the dart pin thrown at the dart board when the player throws the dart pin having the magnet at the magnet. 
     However, such a magnetic dart board has a problem in that the player cannot easily find the position of the dart board, at which the dart pin will be thrown, in a dark environment such as underground cafes because the dart board is generally installed on the surface of a wall. 
     Moreover, in order to prevent such a phenomenon, because illumination must be additionally installed on the surface of the wall where the dart board is installed, such a magnetic dart board has another problem in that it incurs expenses for installing lighting and in that it wastes electric power because the illumination must be always turned on. 
     Furthermore, the magnetic dart board has additional problems in that it is not significantly different from the dart board set having the sharp dart pin besides that the dart pin having the magnet can be attached to the dart board, and in that it is reduced in consumability and marketability because it is nearly permanently usable once being purchased. 
     Additionally, the conventional magnetic dart board set has no interior design effect because it has no additional function besides a game tool for a dart game. 
     In addition, the magnetic dart board set can easily show a printed matter for advertisement due to the nature of its structure in the case that it is used as promotional materials for advertisement, but has another problem in that the cost per unit is increased and an aesthetic effect is reduced in the case that an EL sheet or other luminous means is used because self-glowing of an advertising slogan or the printed matter for advertising is essential in a dark space. 
     DISCLOSURE 
     Technical Problem 
     Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a luminous dart board set, which enables a player to easily see a position of a magnetic dart pin stuck into a dart board and a printed matter printed on the dart board with the naked eyes even in a dark place when the player throws the magnetic dart pin at the dart board. 
     Moreover, it is another object of the present invention to provide a luminous dart board set, which can provide an aesthetic interior design effect by a dart board body and a rim cover that stand out by LED parts, and which can provide a promoting effect of goods or an advertiser because various promotional materials printed on the front surface of the dart board stand out by the LED parts. 
     Technical Solution 
     To achieve the above objects, the present invention provides a luminous dart board set. 
     In an aspect of the present invention, there is a luminous dart board set including: a dart pin having a magnet embedded in the front portion thereof; a dart board made of either an iron plate or an iron rubber sheet and including a printed matter having a printing pattern on the front surface thereof; a body including a fixing part coupled to a bottom surface of the dart board and outwardly bent along the circumference thereof, and a reinforcement part perpendicularly bent in an outward direction of the fixing part; a rim cover including a cover part bent along the circumference of the body so as to cover the front surface of the circumference of the body, and a floodlight space spaced apart from the cover part; LED parts disposed on the inner face of the rim cover so as to emit light toward the floodlight space; and a fluorescent pigment, a phosphorescent pigment, and/or a mixture of the fluorescent pigment and the phosphorescent pigment which is added to at least one of the dart pin, the rim cover, and the printed matter. 
     The luminous dart board set further includes a shock absorbing plate mounted between the lower face of the printed matter and the upper face of the body. 
     Moreover, width of the fixing part of the body is wider than width of the rim cover mounted along the circumference of the body, so that a circular light-emitting band is formed by light of the LED parts emitted through the floodlight space formed by the rim cover along width of the fixing part of the body, which is wider than the width of the rim cover. 
     Furthermore, the luminous dart board set further includes: a scoring sheet disposed between the dart board and the printing pattern for sensing pressure of the dart pin attached to the dart board; a printed circuit board electrically connected with the scoring sheet; and a display part electrically connected with the printed circuit board. 
     Additionally, the scoring sheet includes: a first electric current sheet having first electric current wires printed thereon and respectively concentrically sectioned; and a second electric current sheet having second electric current wires, which are printed thereon and respectively radially sectioned, the second electric current sheet sensing an electric connection of each section formed by the first electric current sheet and the second electric current sheet crossing each other. 
     In addition, the printed circuit board further includes a microprocessor for calculating a previously set score value corresponding to each section of the scoring sheet and sending the calculated score value to the display part. 
     Moreover, the first electric current sheet of the scoring sheet includes first to fourth score sections respectively having different scores, and each score section is electrically connected with the other score sections, which have the same score, in a row. The second electric current sheet of the scoring sheet includes first to fourth grounding sections, which are grounded at positions corresponding to the first to fourth score sections of the first electric current sheet by pressure, and each grounding section is electrically connected with the other grounding sections, which have the same score, in a row, and the second electric current sheet has the same arrangement as the first electric current sheet. Accordingly, a score is detected by an electric connection between the first to fourth score sections and the first to fourth grounding sections. 
     Furthermore, the first scoring section and the third scoring section of the first electric current sheet are electrically connected with each other by a first detection wire, and the second scoring section and the fourth scoring section of the first electric current sheet are electrically connected with each other by a second detection wire. 
     Additionally, the first grounding section and the second grounding section of the second electric current sheet are electrically connected with each other by a third detection wire, and the third grounding section and the fourth grounding section are electrically connected with each other by a fourth detection wire. 
     In another aspect of the present invention, there is a luminous dart board set including: a dart pin having a plastic needle of a sharp tip screw-coupled to the front portion thereof; and a dart board including: a rim cover having a floodlight space; a number board assembled inside the rim cover; a segment receiving board mounted inside the number board and having a plurality of receiving spaces; a plurality of segments received in each of the sectioned receiving spaces of the segment receiving board and each having a needle hole to which the plastic needle of the dart pin is stuck in a width direction; and a rear cover arranged at the rear of the segment receiving board, wherein LED parts, which emit light toward the floodlight space of the rim cover, are arranged on the inner face of the rim cover in a circular form and face the center of the dart board. 
     Moreover, at least one of a fluorescent pigment, a phosphorescent pigment, and a mixture of the fluorescent pigment and the phosphorescent pigment is added to at least one of the dart pin, the rim cover, the number board, the segment receiving board, and the segments. 
     Furthermore, the luminous dart board set further includes a shock absorbing plate mounted on an inner face in corresponding to the segments of the rear cover. 
     Additionally, the luminous dart board set further includes: a scoring sheet disposed between the segments and the rear cover for sensing shock generated when the dart pin is stuck into the needle hole of the segment and producing a score; a printed circuit board electrically connected with the scoring sheet; and a display part electrically connected with the printed circuit board. 
     In addition, the printed circuit board further includes a microprocessor for calculating a previously set score value corresponding to each section of the scoring sheet and sending the calculated score value to the display part. 
     Furthermore, the luminous dart board set further includes: a stand on which the dart board is mounted; a monitor mounted above the dart board of the stand for outputting a dart score; and a manipulation button mounted under the dart board of the stand for allowing reset or ON/OFF modes of the monitor; and a speaker mounted under the manipulation button. 
     Additionally, the sectioned spaces of the segment receiving board are concentrically and/or radially sectioned into equal parts. 
     Advantageous Effects 
     The luminous dart board set according to the present invention can obtain a good interior design effect in a dark space by illumination emitted by the LED parts mounted inside the body and the rim cover disposed along the circumference of the front face of the body. 
     Moreover, because the fluorescent pigment is impregnated in the dart pin, people can easily see the position of the dart pin attached to the dart board even in the dark space and feel an aesthetic sense. 
     Furthermore, the dart pin self-glows by light emitted by the LED parts, and hence, the dart board set provides a luminous effect at the portion where the dart pin is attached. 
     Additionally, because the circular light-emitting band is formed between the body and the rim cover, the present invention can provide an aesthetic sense and an interior design effect as well as be used as a game tool. 
     In addition, because various kinds of promotional words, logos or product names expressed on the printed matter on the front surface of the dart board, to which the dart pin is attached, are expressed with the fluorescent pigment or the phosphorescent pigment, it can maximize an advertising effect of the manufacturer through a self-glowing effect of the printed matter. 
     Moreover, because a dart score produced when a player throws the dart pin is automatically calculated by the scoring sheet and displayed on the display part, people can easily see the score even in the dark place, and hence, it enhances gameability and usability because there is no need to sum up the scores manually. 
     Furthermore, the present invention remarkably simplifies the key matrix structure because the sections of the same score on the scoring sheet are electrically connected in a row, and hence, it reduces a defect rate in operation and also reduces the price. 
     Additionally, the present invention can output the dart scores in a voice-operated manner, and hence, it provides persons, who are visually handicapped, with convenience. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a luminous dart board set according to a first preferred embodiment of the present invention. 
         FIG. 2  is an exploded perspective view showing a structure of the luminous dart board set according to the first preferred embodiment of the present invention. 
         FIG. 3  is a perspective view of a fluorescent dart pin, which is one of essential parts of the luminous dart board set according to the first preferred embodiment. 
         FIG. 4  is a sectional view showing the structure of the luminous dart board set according to the first preferred embodiment. 
         FIG. 5  is an enlarged view showing essential parts of the luminous dart board set according to the first preferred embodiment. 
         FIG. 6  is a front view showing a structure of a luminous dart board set according to a second preferred embodiment of the present invention. 
         FIGS. 7 to 9  are views showing a structure of a luminous dart board set according to a third preferred embodiment of the present invention. 
         FIGS. 10 to 13  are views showing a structure of a luminous dart board set according to a fourth preferred embodiment of the present invention. 
         FIG. 14  is a perspective view of the luminous dart board set according to the second preferred embodiment. 
         FIG. 15  is a front view of the luminous dart board set according to the second preferred embodiment. 
         FIG. 16  is an exploded perspective view of the luminous dart board set according to the second preferred embodiment. 
         FIG. 17  is a vertically sectional view of the luminous dart board set according to the second preferred embodiment. 
         FIG. 18  is a vertically sectional view of  FIG. 1 . 
         FIG. 19  is a partially enlarged view of  FIG. 18 . 
         FIG. 20  is an enlarged view of  FIG. 19 . 
         FIGS. 21 to 25  illustrate examples of various forms of the luminous dart board set according to the present invention. 
         FIG. 26  is a view showing a structure of a dart pin. 
         FIG. 27  is a view showing a state where light is emitted from circularly arranged LED parts. 
     
    
    
     MODE FOR INVENTION 
     Description will now be made in detail of preferred embodiments of the present invention with reference to the attached drawings. It will be understood by those skilled in the art that the embodiments described in the specification are merely exemplary and the present invention is not limited. Therefore, a person skilled in the art can perform various changes and modifications based on a principle of the present invention. In the specification of the present invention, the terms, ‘and/or’ means that at least one of components listed at the front and the rear is included. It will be understood that the expression, ‘located on’ in the specification and claims implies not only that a component is directly located on another component but also that a third component may be additionally located on the component. In the present invention, the words ‘first’ and ‘second’ are used to designate each component or part of the present invention, but it will be understood that the words used in the specification and claims are used to clearly describe or explain the present invention and shall not be interpreted as the limited meanings. It will be also understood that thickness and relative thickness of components in the drawings may be exaggerated for clear description of the present invention. Moreover, matters illustrated in the drawings are schematized in order to describe or explain the embodiments of the present invention more easily, and hence, may be different from forms embodied actually. 
     First, referring to  FIGS. 1 to 13 , a luminous dart board set according to a first preferred embodiment of the present invention will be described. 
     As illustrated in the drawings, the luminous dart board set includes a fluorescent dart pin  10 , a dart board  20  to which the dart pin  10  is attached, a body  30 , a shock-absorbing plate  40 , a rim cover  50 , and LED parts  70 . 
     As shown in  FIG. 3 , the dart pin  10  includes a magnet  11  embedded in a front face thereof, a fluorescent pigment  101  impregnated therein, and dart wings  12  formed integrally with the dart pin  10 . 
     When the fluorescent dart pin  10  is attached onto the front surface of the dart board  20  by light emitted through the LED parts  70 , it produces a luminous effect, and hence, a player can easily see the position of the dart pin  10  attached to the dart board  20  even though there is no illumination in a dark space. 
     Moreover, due to the light emitting function of the dart pin  10 , because light is emitted toward a printing pattern  21  expressed on a front surface of the dart board  20 , to which the dart pin  10  is attached, it provides an effect that a printed matter of the dart board, to which the dart pin  10  is attached, stand out visually. 
     The dart board  20  is made with an iron plate or an iron rubber sheet and includes a printed matter  22  having a printing pattern  21  on the front surface thereof. 
     The dart board  20  is generally formed in a circular shape and is magnetized in such a fashion that the magnet  11  embedded in the front side of the fluorescent dart pin  10  is thrown at the dart board  20  and attached to the dart board  20  by its magnetism. 
     The printed matter  22  adhered on the front surface of the dart board  20  is made of paper or synthetic resin. 
     The printing pattern  21  shown on the printed matter  22  is promotional materials, such as darts, archery, advertising copies or product advertising words of the manufacturer, logos, or others, and the printing pattern  21  is printed with a fluorescent pigment  101  or a phosphorescent pigment  102  or printed with a fluorescent/phosphorescent pigment  102 , in which the fluorescent pigment  101  and the phosphorescent pigment  102  are mixed, so that the printing pattern  21  emits light by the LED parts  70  or self-glows. 
     That is, in the case that the printing pattern  21  shown on the front surface of the printed matter  22  is printed with the fluorescent pigment  101 , the printing pattern  21  glows by light emitted through the LED parts  70 . In the case that the printing pattern  21  is printed with the phosphorescent pigment  102 , the printing pattern  21  self-glows by the phosphorescent pigment  102 , which receives and stores light, even though the LED parts  70  do not emit light, and hence, the luminous effect is kept for a predetermined period of time even after lights-out. 
     Therefore, the luminous dart board set according to the present invention can provide a good visual effect in such a fashion that dart players or people, who watch dart games, can feel beauty and an aesthetic sense through the luminous printing pattern  21  of the printed matter  22 , and enhance promotion and advertisement effects of the manufacturer or the product because the luminous printing pattern  21  glows even in the dark space. 
     The body  30  includes: a fixing part  32  which is coupled to a bottom surface of the dart board  20  and outwardly bent along the circumference thereof and has a projecting coupling hole  31  formed on the inner face thereof; and a reinforcement part  33  perpendicularly bent in an outward direction of the fixing part  32 . 
     Furthermore, the body  30  may further include a protrusion  34  protrudingly formed on a lower portion thereof. The protrusion  34  may be in a double array structure of a circular band type formed from a lower face of the body  30  and have the same thickness as the body  30 . 
     When the protrusion  34  is formed as described above, it can prevent the body  30  from being bent when the body  30  is injection-molded, and hence, a defect rate is minimized while the injection-molding of the body  30 . 
     For instance, in the case that the protrusion  34  is not formed, the body  30  is formed in a circular flat plate shape, and hence, ability to cope with tensile strength or compressive stress generated during the injection-molding is decreased, and hence, the body may be bent during the injection-molding. 
     Accordingly, the defect rate of the body is increased due to an error generated while the components of the luminous dart board set are assembled, but the protrusion  34  formed on the lower portion of the body  30  can solve the problem occurring while the injection-molding of the body. 
     The shock-absorbing plate  40  is located between the dart board  20  and the front surface of the body  30  in order to absorb flexibility of the dart pin  10  attached to the dart board  20 , and it is preferable that the shock-absorbing plate  40  is made of sponge, which is rapidly restored in shape. 
     As described above, because the shock-absorbing plate  40  is located between the dart board  20  and the body  30 , shock and noise generated when the dart pin  10  is thrown at the front surface of the dart board  20  can be absorbed, and it prevents the dart pin  10  from not being attached to the dart board  20  and dropping down by repulsive power generated when the dart pin  10  is bumped against the dart board  20 . 
     The rim cover  50  includes: a cover part  51  bent along the circumference of the body  30  so as to cover the front surface of the circumference of the body  30 ; a floodlight space  52  spaced apart from the cover part; and a fixing projection  53  projecting from the inner face thereof at a position corresponding to the projecting coupling hole  31  of the fixing part  32  of the body  30 . 
     Additionally, the rim cover  50  may include a fluorescent pigment  101 , and the rim cover  50 , in which the fluorescent pigment is impregnated, glows by light emitted through the LED parts  70 . 
     The rim cover  50  is mounted on the front surface of the circumference of the body  30  in a state where the front surface of the circumference of the body  30  is spaced apart from the cover part  51  of the rim cover  50  at a predetermined interval, so that the floodlight space  52  can be naturally formed between the cover part  51  and the circumference of the body  30 . 
     The floodlight space  52  can be formed through the steps of fitting the fixing projection  53 , which is formed on the inner face of the rim cover  50 , to the projecting coupling hole  31  of the body  30  and fastening it with a piece  61 . In this instance, when a support bracket  60  is interposed between the projecting coupling hole  31  and the fixing projection  53 , the floodlight space  52  becomes widened, and hence, the printed pattern looks brighter. 
     Moreover, because the reinforcement part  33  perpendicularly bent in the outward direction of the fixing part  32  of the body  30  is in close contact with the rim cover  50 , combination between the body  30  and the rim cover  50  is enhanced. 
     The LED parts  70  are disposed on the inner face of the rim cover  50  to emit light toward the floodlight space  52  of the rim cover  50 . 
     Each of the LED parts  70  generally includes light emitting diodes and a printed circuit board to which the light emitting diodes are electrically connected, and the diodes may be chip-type diodes or ball-type diodes. 
     The LED parts  70  are connected in a band type along the inner circumference of the cover part  51  of the rim cover  50 , and the rim cover  50 , the body  30 , the dart pin  10  and the printing pattern  21  shown on the printed matter  22  glow by light emitted through the LED parts  70 . 
     In other words, light emitted through the LED parts  70  is irradiated from the floodlight space  52  formed between the rim cover  50  and the body  30  and influences on the printed matter  22  of the dart board  20  formed on the front surface of the body as well as on the body  30 , and hence, the dart pin  10  attached to the dart board and the printing pattern  21  of the printed matter  22  also glow. 
     Accordingly, when the LED parts  70  are turned on, the rim cover  50 , because the body  30  and the printing pattern  21  of the printed matter  22  glow, it produces a good visual image and an aesthetic sense and provides an interior design effect. 
     Furthermore, the printing pattern  21  of the printed matter glows in a state where the wavelengths of light emitted through the LED parts  70  are overlapped, and hence, it highlights images or words expressed on the printing pattern  21  to thereby enhance the visual effect. 
     The light emitting diodes of the LED parts  70  have power consumption ranging from 0.1 W to 0.5 W and the number of the light emitting diodes ranges 10 to 100, but the number of the light emitting diodes is not restricted thereto. 
     Light emitted from the light emitting diodes of the LED parts  70  may include white light or green light. 
     In this instance, the white light or the green light emitted through the LED parts  70  is in the optimal luminous condition when it is reflected to the rim cover  50 , the printing pattern  21  of the printed matter  22 , and the dart pin  10 , in which the fluorescent pigment  101  or the phosphorescent pigment  102  are selectively impregnated, and hence, the players and the people, who watch the dart game, can feel an enhanced aesthetic sense and beauty. 
     The luminous dart board set according to the present invention can provide unique light-emitting effect and illumination effect because the fluorescent pigment  101 , the phosphorescent pigment  102 , and mixture of the fluorescent pigment  101  and the phosphorescent pigment  102  are selectively used to the rim cover  50 , the printing pattern  21  of the printed matter  22 , and the dart pin  10 . 
     Additionally, in the luminous dart board set according to the present invention, width (a) of the fixing part  32  of the body  30  is wider than width (b) of the rim cover  50  mounted along the circumference of the body  30 . 
     Accordingly, as shown in  FIG. 6 , a circular light-emitting band  80  is formed by light of the LED parts  70  emitted through the floodlight space  52  formed by the rim cover  50  along width (c) of the fixing part  32  of the body  30 , which is wider than the width (b) of the rim cover  50 . 
     Because the light of the LED parts  70  emitted through the floodlight space  52  is irradiated toward the width (c) of the fixing part  32  of the body  30 , which is wider than the width (b) of the rim cover  50 , the circular light-emitting band  80  is naturally formed along the width (c) of the fixing part  32 , and hence, it enhances beauty and the aesthetic sense of the outward appearance of the luminous dart board set and highlights the good visual image in interior design. 
     Moreover, when a player throws the dart pin  10  away and the dart pin  10  is attached to the dart board  20 , as shown in  FIG. 6 , a luminous zone  10   a  is formed around the dart pin  10  by light emitted through the dart pin  10  toward the printing pattern  21  shown on the front surface of the dart board  20 , to which the dart pin  10  is attached, and hence, it provides an illumination effect that light is emitted to the printing pattern  21  and printed matters around the dart pin  10  can be highlighted visually. 
       FIGS. 7 to 9  illustrate a luminous dart board set according to a second preferred embodiment of the present invention. 
     As shown in the drawings, the luminous dart board set further includes: a scoring sheet  210  disposed between the dart board  20  and the printing pattern  21  for sensing the dart pin  10  attached to the dart board  20 ; a printed circuit board  220  electrically connected with the scoring sheet  210 ; and a display part  230  electrically connected with the printed circuit board  220 . 
     The scoring sheet  210  includes: a first electric current sheet  212  having first electric current wires  211  respectively printed thereon and respectively concentrically insulated and sectioned; and a second electric current sheet  214  having second electric current wires  212 , which are printed thereon and respectively radially insulated and sectioned, the second electric current sheet  214  being piled up with the first electric current sheet  212 . 
     The scoring sheet  210  may have a film type membrane switch, or may be applied to all means which is switched by shock generated when the dart pin is attached to the dart board. 
     Moreover, the printed circuit board  220  further includes a microprocessor  240  for calculating a score value set at a position which is charged with electricity by pressure of the dart pin  10  sensed on the scoring sheet  210  and sending the calculated score value to the display part  230 . 
     When the dart pin  10  thrown by a player is attached to any one point where the first electric current wire  211  of the first electric current sheet  212  and the second electric current wire  213  of the second electric current sheet  214  of the scoring sheet  210  cross each other, the first electric current wire  211  and the second electric current wire  213  get in contact with each other at the point where the dart pin  10  is attached, and hence, the score value of the contact point is transferred to the printed circuit board  220 , to which the first electric current wire  211  of the first electric current sheet  212  and the second electric current wire  212  of the second electric current sheet  214  are electrically connected. 
     Because information on scores corresponding to the combination of the sectioned first and second electric current wires  211  and  213  is set in advance, a score value corresponding to a zone (a) located at the point where the dart pin  10  thrown by the player is attached is calculated by the microprocessor  240  of the printed circuit board  220 , and it is displayed through the display part  230 . 
       FIGS. 10 to 13  illustrate a luminous dart board set according to a third preferred embodiment of the present invention. 
     In general, a scoring zone of the dart board set has a predetermined pattern, and the same scoring zone is connected in a row with one wire. 
     As shown in the drawings, the first electric current sheet  212  of the scoring sheet  210  includes first to fourth score sections  212   a ,  212   b ,  212   c  and  212   d  respectively having different scores, and each score section is electrically connected with the other score sections, which have the same score, in a row. 
     The second electric current sheet  214  of the scoring sheet  210  includes first to fourth grounding sections  214   a ,  214   b ,  214   c  and  214   d , which are located at positions corresponding to the first to fourth score sections  212   a ,  212   b ,  212   c  and  212   d  of the first electric current sheet  212  and are grounded by pressure. 
     Each of the grounding sections is electrically connected with the plural grounding sections having the same score in a row, and has the same arrangement as the first electric current sheet  212 , and hence, a score is detected by the electric connection between the first to fourth scoring sections  212   a ,  212   b ,  212   c  and  212   d  and the first to fourth grounding sections  214   a ,  214   b ,  214   c  and  214   d.    
     The first scoring section  212   a  and the third scoring section  212   c  of the first electric current sheet  212  are electrically connected with each other by a first detection wire  215   a , and the second scoring section  212   b  and the fourth scoring section  212   d  of the first electric current sheet  212  are electrically connected with each other by a second detection wire  215   b.    
     Additionally, the first grounding section  214   a  and the second grounding section  214   b  of the second electric current sheet  214  are electrically connected with each other by a third detection wire  215   c , and the third grounding section  214   c  and the fourth grounding section  214   d  are electrically connected with each other by a fourth detection wire  215   d.    
     When the dart pin is attached to one of the first to fourth scoring sections  212   a ,  212   b ,  212   c  and  212   d  electrically connected to the first electric current sheet  212 , one of the first to fourth grounding sections  214   a ,  214   b ,  214   c  and  214   d  grounded with the first to fourth scoring sections  212   a ,  212   b ,  212   c  and  212   d  is grounded with the scoring section located at the position where the dart pin is attached, and a ground signal is detected through one of the first to fourth detection wires  215   a ,  215   b ,  215   c  and  215   d.    
     For instance, referring to  FIG. 13 , how to detect one score will be described. When the dart pin is attached to the first scoring section  212   a  of the first electric current sheet  212 , which has one point, the first scoring section  212   a  is grounded with the first grounding section  214   a  of the second electric current sheet  214 , and detection signals of the first detection wire  215   a  electrically connected with the first scoring section  212   a  and the third detection wire  215   c  electrically connected with the first grounding section  214   a  are transferred to the printed circuit board  220 , and hence, as shown in  FIG. 13 , the previously set ‘one score’ corresponding to a key matrix combination (A 1  and B 2 ) of ‘A 1 ’ of the first detection wire  215   a  and ‘B 1 ’ of the second detection wire  215   b  is displayed on the display part. 
     According to the above structure, when the dart pin is attached to each scoring section, because the score corresponding to coordinate values of each scoring section to which the dart pin is attached and each grounding section which is grounded with the scoring section is displayed, the player can see the score displayed on the display part  220  with the naked eyes to check his or her rank. 
     Next, referring to  FIGS. 14 to 29 , a luminous dart board set according to a fourth preferred embodiment of the present invention will be described. 
     As shown in  FIGS. 14 to 29 , the luminous dart board set S according to the fourth preferred embodiment of the present invention includes a dart board  400  and a dart pin  300 . 
     The dart board  400  is made of metal or synthetic resin, and is generally in a circular shape, but the front face of the dart board  400  is not restricted to the circular shape and may adopt one of various shapes, for instance, a polygonal shape. 
     Here, the dart board  400  may have a promotional printed matter on the front surface thereof (not shown). 
     The dart board  400  includes a rim cover  410  having LED parts  413 , a number board  420 , a segment receiving board  430 , a segment  440 , and a rear cover  450 . 
     The rim cover  410  is formed on the circumference of the front surface of the dart board  400 , and mounted on the circumference of the number board  420 . Such a rim cover  410  includes a cover part  411  bent to surround the circumference of the number board  420  and a floodlight space  412  inwardly spaced apart from the cover part  411 . 
     Moreover, the rim cover  410  is mounted on the front surface of the circumference of the number board  420  in a state where the circumference of the number board  420  is spaced apart from the cover part  411  of the rim cover  410  at a predetermined interval, and hence, the floodlight space  412  is naturally formed between the cover part  411  and the circumference of the number board  420 . 
     Furthermore, the rim cover  410  may contain one selected from a fluorescent pigment, a phosphorescent pigment, and a fluorescent/phosphorescent pigment, in which the fluorescent pigment and the phosphorescent pigment are mixed, by impregnation, coating or other method, and in this instance, the rim cover  410  emits light or self-glows by light emitted through the LED parts  413 . 
     Additionally, the rim cover  410  may further include a joining projection  414  forcedly fit to a projection joining part  422  of the number board  420 , which will be described, at the rear part of the rim cover  410 . 
     In addition, the LED parts  413  are mounted on the inner face of the rim cover  410  and are to emit light toward the floodlight space  412  of the rim cover  410 . Each of the LED parts  413  generally includes light emitting diodes and a printed circuit board (not shown) electrically connected with the light emitting diodes. Here, the light emitting diodes may be one of chip type diodes and ball type diodes. 
     Such LED parts  413  are connected in a band type along the inner circumference of the cover part  411  of the rim cover  410 , and hence, by the emitted light, pigments contained in the rim cover  410 , the number board  420 , the dart pin  400 , the segment receiving board  430 , and the segment  440  glow. 
     Additionally, because the light emitted through the LED parts  413  shines the components containing the pigments while being dispersed in various directions through the floodlight space  412  formed between the rim cover  410  and the number board  420 , so that the luminous effect is enhanced and the interior design effect is also increased. 
     The light emitting diodes of the LED parts  413  have power consumption ranging from 0.1 W to 0.5 W and the number of the light emitting diodes ranges 10 to 100, but the number or arrangement of the light emitting diodes is not restricted thereto. 
     Moreover, light emitted from the light emitting diodes of the LED parts  413  may include white light or green light. In this instance, the white light or the green light emitted through the LED parts  413  is in the optimal luminous condition when it is reflected to the component, in which the fluorescent pigment or the phosphorescent pigment are selectively impregnated, and hence, the players and the people, who watch the dart game, can feel an enhanced aesthetic sense and beauty. 
     The number board  420  may contain one selected from a fluorescent pigment, a phosphorescent pigment, and a fluorescent/phosphorescent pigment, in which the fluorescent pigment and the phosphorescent pigment are mixed, by impregnation, coating or other method, and in this instance, the rim cover  410  emits light or self-glows by light emitted through the LED parts  413  mounted along the inner circumference thereof. 
     The number board  420  is arranged at the rear of the rim cover  410 , and includes: a fixing part  421  disposed on the front face thereof and having a plurality of projection joining parts  422 ; and a reinforcement part  423  horizontally bent in an outward direction along the circumference of the fixing part  421 . 
     In the meantime, the projection joining part  422  is assembled by insertion of the joining part  414  formed on the rear face of the rim cover  410 . The longer the projection joining art  422  and the joining part  414  inserted into the projection joining part  422  are, the larger the floodlight space  412  is. However, if they are too long, because the joining of the joining parts is not stable, it is preferable to set a proper length. 
     Meanwhile, in order to join the rim cover  410  and the number board  420  together, the joining part  414  is inserted into the projection joining part  422 , and then, a piece or a screw (sc) is fastened from the inward face of the number board  420  so as to join them. 
     Moreover, if width (a) of the fixing part  421  of the number board  420  is wider than a front face width (b) of the rim cover  410 , a circular luminous band (not shown) is formed as much as a deviation width (c) between the width (a) of the fixing part and the front face width (b). 
     Accordingly, because the LED light emitted through the floodlight space  412  is radiated toward the width (a) of the fixing part  421  of the number board  220 , which is wider than the front face width (b) of the rim cover  210 , the circular luminous band is naturally formed along the width (a) of the fixing part  421 , and hence, it enhances beauty and the aesthetic sense of the outward appearance of the luminous dart board set and highlights the good visual image in interior design. 
     Furthermore, as shown in  FIG. 29 , the LED parts  413  are circularly arranged in the band type inside the rim cover  410 , and hence, light shines toward the center of the dart board  400 . Therefore, the front surface of the dart board  400  glows to thereby enhance beauty and the aesthetic sense of the dart board. 
     The segment receiving board  430  is arranged at the central portion of the number board  420 , and is joined with the rear cover  450  through a joining flange  431  outwardly and perpendicularly bent at the rear thereof. 
     The segment receiving board  430  may contain one selected from a fluorescent pigment, a phosphorescent pigment, and a fluorescent/phosphorescent pigment, in which the fluorescent pigment and the phosphorescent pigment are mixed, by impregnation, coating or other method, and in this instance, the rim cover  410  emits light or self-glows by light emitted through the LED parts  413  mounted along the inner circumference thereof. 
     The segment receiving board  430  has a plurality of receiving spaces  432  formed therein. For instance, the receiving spaces  432  are twenty first arc-shaped receiving portions  432  formed along the rim of the receiving board  430 , twenty second arc-shaped receiving portions  433  formed inside the first receiving portions  432 , twenty third arc-shaped receiving portions  434  formed inside the second receiving portions  433 , and twenty fourth arc-shaped receiving portions  435  formed inside the third receiving portions  434 . 
     Differently from the above, as illustrated in  FIGS. 8 ,  9 ,  10  and  12 , the segment receiving board  430  may have a plurality of circular receiving portions formed concentrically. So, because the segment receiving board  430  has a form similar to the target board for archery, people can enjoy archery and use the segment receiving board  430  as the target board for archery. 
     A segment  440  received in each of the receiving spaces  432  of the segment receiving board  430  has a needle hole  441  formed in a thickness direction in such a fashion that a plastic pin  310  of the dart pin  300 , which will be described later, can be stuck into the needle hole  441  in the thickness direction. 
     In this instance, the segment receiving board  430  may contain one selected from a fluorescent pigment, a phosphorescent pigment, and a fluorescent/phosphorescent pigment, in which the fluorescent pigment and the phosphorescent pigment are mixed, by impregnation, coating or other method, and in this instance, the rim cover  410  emits light or self-glows by light emitted through the LED parts  413  mounted along the inner circumference thereof. 
     The rear cover  450  forms the rear face of the dart board  400 , and is screw-coupled to the number board  420 . 
     Moreover, the rear cover  450  is in an approximately flat plate shape, and has a flange part  451 , which is outwardly horizontally bent at the rim of the rear cover  450  and gets in close contact with the inner circumferential surface of the number board  420 . 
     Furthermore, the rear cover  450  may further include a joining hole  452  formed on the inner face thereof. The joining hole  452  has a structure of an assembly piece for an easy bolt fixation, such that the number board  420  and the shock absorbing plate  460  can be easily matched with the rear cover  450  because a projection  424  formed on the number board  420  passes through the shock absorbing plate  460  and is fit to the shock absorbing plate  460 . 
     In the meantime, the luminous dart board set (S) according to the present invention may further include another shock absorbing plate  460  mounted on the inner face corresponding to the segment  440  of the rear cover  450 . 
     The shock absorbing plate  460  serves to absorb flexibility (shock) of the dart pin  300  stuck into the segment  440 , and it is preferable that the shock absorbing plate  460  is made of one of sponge, styrene foam, cork, and rubber, which are rapidly restored in shape. 
     As described above, because the shock absorbing plate  460  is arranged on the inner face of the rear cover  450 , it can absorb shock and noise generated when the dart pin  300  is bumped against the dart board  400 , and hence, it prevents the dart pin  10  from not being attached to the dart board  20  and dropping down. 
     Moreover, the luminous dart board set (S) according to the present invention may further include a scoring sheet  470  mounted on the inner face of the shock absorbing plate  460 , a printed circuit board  480  electrically connected with the scoring sheet  470 , and a display part  490  electrically connected with the printed circuit board  480 . 
     The scoring sheet  470  includes: a first electric current sheet  471  having first electric current wires respectively printed thereon and respectively concentrically insulated and sectioned; and a second electric current sheet  472  having second electric current wires, which are printed thereon and respectively radially insulated and sectioned, the second electric current sheet  472  being piled up with the first electric current sheet  471 . The scoring sheet  470  may have a film type membrane switch, or may be applied to all means which is switched by shock generated when the dart pin is attached to the dart board. 
     Unexplained reference numeral  473  designates an insulating plate for insulating the first electric current sheet  471  from the second electric current sheet  472 . 
     Moreover, the printed circuit board  480  further includes a microprocessor  481  for calculating a score value set at a position which is charged with electricity by pressure of the dart pin  300  sensed on the scoring sheet  470  and sending the calculated score value to the display part  490 . 
     When the dart pin  300  thrown by a player is attached to any one point where the first electric current wire of the first electric current sheet  471  and the second electric current wire of the second electric current sheet  472  of the scoring sheet  210  cross each other, the first electric current wire and the second electric current wire get in contact with each other at the point where the dart pin  300  is attached, and hence, the score value of the contact point is transferred to the printed circuit board  480 , to which the first electric current wire of the first electric current sheet  471  and the second electric current wire of the second electric current sheet  472  are electrically connected. 
     Because information on scores corresponding to the combination of the sectioned first and second electric current wires is set in advance, a score value corresponding to a zone (a) located at the point where the dart pin  300  thrown by the player is attached is calculated by the microprocessor  481  of the printed circuit board  480 , and it is displayed through the display part  490 . 
     In the meantime, the luminous dart board set (S) according to the present invention may further include: a monitor  510 ; and a manipulation button  520  for allowing reset or ON/OFF modes of the monitor  510 ; and a speaker  530  mounted under the manipulation button  520 . 
     In this instance, as shown in  FIGS. 21 to 25 , the luminous dart board set (S) may have a mounting part for mounting the monitor  510 , the manipulation button  520  and the speaker  530  under the dart board  400  or above and under the dart board  400 . 
     Differently from the above, as shown in  FIG. 26 , the luminous dart board set (S) may include a stand  500  for standing the dart board set, and the dart board  400 , the monitor  510 , the manipulation button  520  and the speaker  530  are mounted on the stand  500 . 
     In the case of the standing dart board set, besides the LED parts  413  mounted inside the dart board, additional LED parts  413 ′ are formed at both sides of the dart board  400 . 
     In the meantime, as shown in  FIG. 27 , the dart board  300  includes: a plastic needle  310  having a sharp tip disposed at the front side; a pin body  320  screw-coupled with the plastic needle  310  and made of metal or plastic; and a dart wing  330  screw-coupled with the rear of the pin body  320 . 
     Here, the plastic needle  310  and the dart wing  330  or the pin body  320  of the dart pin  300  is injection-molded of a plastic material, and the fluorescent pigment is impregnated therein. Therefore, when the fluorescent dart pin  10  is attached onto the front surface of the dart board  20  by light emitted through the LED parts  70 , it produces a luminous effect, and hence, a player can easily see the position of the dart pin  10  attached to the dart board  20  even though there is no illumination in a dark space. 
     While example embodiments of the present invention are capable of various modifications and alternative forms, embodiments of the present device are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit the example embodiments of the present invention to the particular forms disclosed, but on the contrary, the example embodiment of the device is to cover all modifications, equivalents, and alternatives falling within the scope of the present invention. 
     EXPLANATION OF REFERENCE NUMERALS IN THE DRAWINGS 
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                  10: dart pin 
                  11: magnet 
               
               
                   
                  12: dart wing 
                  20: dart board 
               
               
                   
                  21: printing pattern 
                  22: printed matter 
               
               
                   
                  30: body 
                  31: projecting coupling hole 
               
               
                   
                  32: fixing part 
                  33: reinforcement part 
               
               
                   
                  34:: projection 
                  40: shock absorbing plate 
               
               
                   
                  50: rim cover 
                  51: cover part 
               
               
                   
                  52: floodlight space 
                  53: fixing projection 
               
               
                   
                  60: support bracket 
                  61: piece 
               
               
                   
                  70: LED part 
                  80: luminous band 
               
               
                   
                 101: fluorescent pigment 
                 102: phosphorescent pigment 
               
               
                   
                 210: scoring sheet 
                 211: first electric current wire 
               
               
                   
                 212: first electric current sheet 
               
               
                   
                 213: second electric current wire 
               
               
                   
                 214: second electric current sheet 
               
               
                   
                 220: printed circuit board 
               
               
                   
                 230: display part 
                 240: microprocessor 
               
               
                   
                 212a: first scoring section 
               
               
                   
                 212b: second scoring section 
               
               
                   
                 212c: third scoring section 
               
               
                   
                 212d: fourth scoring section 
               
               
                   
                 214a: first grounding section 
               
               
                   
                 214b: second grounding section 
               
               
                   
                 214c: third grounding section 
               
               
                   
                 214d: fourth grounding section 
               
               
                   
                 215a: first detection wire 
               
               
                   
                 215b: second detection wire 
               
               
                   
                 215c: third detection wire 
               
               
                   
                 215d: fourth detection wire 
               
               
                   
                 430: segment receiving board 
                 440: segment 
               
               
                   
                 450: rear cover 
                 460: shock absorbing plate 
               
               
                   
                 470: scoring sheet 
                 480: printed circuit board 
               
               
                   
                 490: display part 
                 500: stand 
               
               
                   
                 510: monitor 
                 520: manipulation button 
               
               
                   
                 530: speaker