Abstract:
A dot sight includes a base, a housing, a reflective element, an emitter, a horizontal adjusting portion and a vertical adjusting portion. The housing is coupled to the base. The reflective element is coupled to the housing. The emitter provides a reticle image to the reflective element. The reflective element reflects at least a portion of the reticle image. The emitter is coupled to the housing. The horizontal adjusting portion adjusts a position of the housing relative to the base. The vertical adjusting portion adjusts a position of the housing relative to the base.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to Korean Application No. 2012-0112001, filed on Oct. 9, 2012, the contents of which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    The present disclosure relates to a dot sight device for use in a small arm such as a handgun, a pistol, or a rifle, and more particularly, to a dot sight device for use in a small arm which is capable of aligning a principal ray among light rays from a dot reticle image of a dot sight device with a gun barrel of a small arm without causing a change in a relative position between a mask and a reflective mirror. 
         [0003]    Small arms such as handguns, pistols, or rifles have a short distance of fire, and in order to increase an accuracy rate, a gun barrel needs to be aligned with an optical axis (an axis through which a principal ray among light rays from a dot reticle image passes) of a dot sight device. Here, a principal ray refers to a representative ray passing through the center of an effective portion of a reflective mirror of a dot sight device. For this reason, dot sight devices for small arms have increasingly employed a mechanism capable of aligning a gun barrel with an optical axis of a dot sight device. 
         [0004]    An optical device with a mechanism that aligns a gun barrel of a handgun with an optical axis of an optical device by adjusting the position of a light emitting diode (LED) that provides a dot reticle is disclosed in U.S. Pat. No. 6,327,806.  FIG. 1  is an exploded perspective view illustrating a dot sight device for used in a small arm with a mechanism disclosed in U.S. Pat. No. 6,327,806. Referring to  FIG. 1 , an elevation adjustment screw  17  used to move an LED with a reticle or a mask (hereinafter, “mask”) fixed to the front thereof from a focal position of a reflective mirror  1  in the horizontal direction, and an azimuth adjustment screw  18  used to move the LED from the focal position of the reflective mirror  1  in the vertical direction are provided. A gun barrel is aligned with a dot reticle image that is reflected from the reflective mirror and then directed toward an observer by turning the elevation adjustment screw  17  or the azimuth adjustment screw  18  according to need. 
         [0005]    However, in the mechanism disclosed in U.S. Pat. No. 6,327,806, since the relative position of the LED is adjusted in a state in which the reflective mirror  1  is fixed, the dot reticle provided from the LED is likely to deviate from the focal point of the reflective mirror  1  in the process of adjustment. Thus, there is a problem in that parallax between light rays which are reflected from the reflective mirror and then incident to the observer&#39;s eye(s) and a target viewed through the reflective mirror significantly occurs in the edge portion of the reflective mirror. In other words, since the relative position of the LED relative to the reflective mirror, that is, the relative position of the mask relative to the reflective mirror is changed, parallax of the dot sight device changes. 
         [0006]    More specifically, when a doublet shown in Table 1 is used as a reflective mirror and a second surface of the double functions to reflect a dot reticle, a directional finite ray aberration of light rays, which are reflected from the reflective mirror and then incident on the observer&#39;s eye(s) in the state in which the dot reticle is positioned on the focal point of the reflective mirror, is about 0.14 milliradians as illustrated in  FIG. 2A . In  FIGS. 2A and 2B , an x axis represents the effective diameter of the reflective mirror, and a y axis represents a directional finite ray aberration. 
         [0000]    
       
         
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
             
             
               
                   
                 Focal distance (f) 
                 −27.2893 mm 
               
               
                   
                 Thickness (t 1 ) of first lens 
                 t 1  = 2.00 mm 
               
               
                   
                 Curvature radius (R 1 ) of 
                 R 1  = −28.484 mm 
               
               
                   
                 first surface 
               
               
                   
                 Thickness (t 2 ) of second 
                 t 2  = 2.50 mm 
               
               
                   
                 lens 
               
               
                   
                 Curvature radius (R 2 ) of 
                 R 2  = −43.116 mm 
               
               
                   
                 second surface 
               
               
                   
                 Curvature radius (R 3 ) of 
                 R 3  = −30.014 mm 
               
               
                   
                 third surface 
               
               
                   
                 glass 
                 BK7 
               
               
                   
                 Effective diameter 
                 Vertical size: 12.5 mm 
               
               
                   
                   
                 Horizontal size: 25.0 mm 
               
               
                   
                   
               
             
          
         
       
     
         [0007]    In the dot sight device employing the reflective mirror shown in Table 1, when the position of the dot mask is changed from the state in which the dot reticle is positioned on the focal point of the reflective mirror for zeroing, for example, when 0.5 mm is changed downward, and 0.5 mm is changed rightward, the dot reticle deviates from the focal point of the reflective mirror. In this case, a directional finite ray aberration of light rays, which are reflected from the reflective mirror and then incident on the observer&#39;s eye(s), is about 1.21 milliradians as illustrated in  FIG. 2B , and an parallax error of reflected light rays in the edge portion of the reflective mirror increases to be about 860 times as large as that of  FIG. 2A . 
       BRIEF SUMMARY 
       [0008]    In an embodiment, a dot sight includes a base, a housing, a reflective element, an emitter, a horizontal adjusting portion and a vertical adjusting portion. The housing is coupled to the base. The reflective element is coupled to the housing. The emitter provides a reticle image to the reflective element. The reflective element reflects at least a portion of the reticle image. The emitter is coupled to the housing. The horizontal adjusting portion adjusts a position of the housing relative to the base. The vertical adjusting portion adjusts a position of the housing relative to the base. 
         [0009]    In another embodiment, a method of adjusting a dot sight includes: providing a base, a housing coupled to the base, a reflective element coupled to the housing, and an emitter that provides a reticle image to the reflective element, the reflective element reflecting at least a portion of the reticle image, and the emitter being coupled to the housing; and adjusting a position of the housing relative to the base while the reflective element and the emitter are fixed to the housing. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is an exploded perspective view a dot sight device for used in a small arm according to a related art; 
           [0011]      FIGS. 2A and 2B  are graphs illustrating a directional finite ray aberration in a dot sight device for used in a small arm according to a related art; 
           [0012]      FIG. 3  is a diagram illustrating a dot sight device for used in a small arm according to the present disclosure; 
           [0013]      FIG. 4  is a perspective view illustrating a dot sight device for used in a small arm according to the first embodiment of the present disclosure; 
           [0014]      FIG. 5  is an exploded perspective view illustrating the dot sight device according to the first embodiment of the present disclosure; 
           [0015]      FIG. 6  is an exploded elevation view illustrating the dot sight device according to the first embodiment of the present disclosure; 
           [0016]      FIG. 7  is a top view illustrating the dot sight device according to the first embodiment of the present disclosure; 
           [0017]      FIG. 8  is a cross-sectional view taken along line VIII-VIII′ of  FIG. 7 ; 
           [0018]      FIG. 9  is a cross-sectional view taken along line IX-IX′ of  FIG. 7 ; 
           [0019]      FIG. 10  is a top view for describing an operation of adjusting the dot sight device according to the first embodiment of the present disclosure; 
           [0020]      FIG. 11  is a cross-sectional view taken along line XI-XI′ of  FIG. 10 ; 
           [0021]      FIG. 12  is a cross-sectional view taken along line XII-XII′ of  FIG. 10 ; 
           [0022]      FIG. 13  is a perspective view illustrating a dot sight device for used in a small arm according to the second embodiment of the present disclosure; 
           [0023]      FIG. 14  is an exploded perspective view illustrating the dot sight device according to the second embodiment of the present disclosure; 
           [0024]      FIG. 15  is a plane view illustrating the dot sight device according to the second embodiment of the present disclosure; and 
           [0025]      FIG. 16  is a cross-sectional view illustrating the dot sight device according to the second embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0026]    Hereinafter, exemplary embodiments of a dot sight device for used in a small arm according to the present disclosure will be described with reference to the appended drawings. 
         [0027]    In an exemplary embodiment, a dot sight device is provided for use in a small arm which is capable of aligning a principal ray with a gun barrel of a small arm without causing a change in a relative position between an LED (that is, a mask) and a reflective mirror, that is, without causing a change in parallax of a dot sight device. 
         [0028]    In an exemplary embodiment, a compact dot sight device is provided for use in a small arm which is capable of increasing an accuracy rate. 
         [0029]    A dot sight device for used in a small arm according to a first embodiment of the present disclosure will be described below. First, the structure of the dot sight device for used in a small arm according to the first embodiment of the present disclosure will be described with reference to  FIGS. 3 to 6 . 
         [0030]    A dot sight device  100  for used in a small arm according to the first embodiment of the present disclosure is mounted on the rear end of a slide of a small arm P in parallel with a gun barrel, and includes a base  110 , a housing  120 , a connecting member  130 , an adjusting member  140 , and an elastic member  150 . 
         [0031]    The base  110  is removably mounted on the slide of the small arm P or formed integrally with the slide of the small arm P, and includes a first accommodating groove  114  that accommodates the bottom portion of the housing  120 . 
         [0032]    The housing  120  includes a reflective mirror  123  arranged on one end facing a target, a dot reticle generating unit  124  that is arranged on the other end facing the observer and emits dot light toward the reflective mirror  123 , and a cover  125  arranged to cover the reflective mirror  123 . The dot reticle generating unit  124  includes an LED and a mask, and the mask is generally fixed to the front of the LED. Light emitted from the dot reticle generating unit  124  has a shape (for example, a dot, a spot, or a cross) corresponding to the shape of the mask. In the present embodiment, the mask is assumed to have the dot shape, and thus the light emitted from the dot reticle generating unit  124  is referred to as a dot reticle. However, the shape of the mask is not limited to the dot shape, and for example, the mask may have the cross shape. The cover  125  extends in the optical axis direction so that the reflective mirror  123  and the dot reticle generating unit  124  are arranged in space formed by the cover  125 . A battery that supplies power to the dot reticle generating unit  124  is removably installed in the housing  120 , and a power switch used to selectively supply battery power to the dot reticle generating unit  124  is arranged on one side of the housing  120 . In the drawings, the cover  125  is formed separately from the housing  120  and assembled with the housing  120 , but the cover  125  may be formed integrally with the housing  120 . 
         [0033]    The connecting member  130  includes a first coupling hole  111  that is vertically formed on one end of the base  110 , a second coupling hole  121  that is vertical formed at the position corresponding to the first coupling hole  111  in one end of the housing  120 , a hinge shaft  131  having a rear end which is supported by the second coupling hole  121  of the housing  120  and a front end which vertically pass through the second coupling hole  121  and is screw-coupled with the first coupling hole  111  of the base  110 , and a ring-like elastic support  132  which is made of rubber providing elastic repulsive force again compressive force and interposed between the first coupling hole  111  of the base  110  and the second coupling hole  121  of the housing  120 . Spherical surfaces are formed on upper inner circumferential surfaces of the head portion  131   a  of the hinge shaft  131  and the second coupling hole  121  supporting the head portion  131   a . Through the hinge shaft  131 , the housing  120  connected to one end of the base  110  can vertically or horizontally rotate or move on the spherical center of the head portion  131   a  and the second coupling hole  121  since the elastic support  132  is interposed between the first coupling hole  111  of the base  110  and the second coupling hole  121  of the housing  120 . 
         [0034]    The adjusting member  140  includes a first connecting portion  112 , a second connecting portion  122 , a joint  141 , a horizontal adjusting portion  142 , and a vertical adjusting portion  143 . The first connecting portion  112  is formed on the other end of the base  110 , and has a movement space  113  which is formed in a horizontally extending long hole shape in the center of the first connecting portion  112  in the vertical direction. The second connecting portion  122  is arranged on the other end of the housing  120  at the position of the movement space  113  of the first connecting portion  112 . The joint  141  includes a horizontal coupling hole  141   a  which is formed in the horizontal direction and a vertical coupling hole  141   b  which is formed in the vertical direction, and is arranged in the movement space  113  of the base  110  to be movable in the horizontal direction. Here, an axis of the horizontal coupling hole  141   a  meets and crosses an axis of the vertical coupling hole  141   b  at the same plane. The horizontal adjusting portion  142  passes through the first connecting portion  112  of the base  110  and the joint  141  in a direction perpendicular to the gun barrel on a horizontal plane, is rotatably supported by the first connecting portion  112 , and is screw-coupled with the horizontal coupling hole  141   a  of the joint  141 . The vertical adjusting portion  143  passes through the second connecting portion  122  of the housing  120  and the joint  141  in a direction perpendicular to the gun barrel on a vertical plane, is rotatably supported by the second connecting portion  122 , and is screw-coupled with the vertical coupling hole  141   b  of the joint  141 . Here, since the joint  141  is configured such that an axis of the horizontal coupling hole  141   a  meets and crosses an axis of the vertical coupling hole  141   b  at the same plane, the vertical adjusting portion  143  preferably has the length by which the vertical adjusting portion  143  does not come into contact with the horizontal adjusting portion  142  even when the vertical adjusting portion  143  is completed fastened into the vertical coupling hole  141   b.    
         [0035]    The elastic member  150  includes a plate spring, is interposed between the first accommodating groove  114  of the base  110  and the bottom portion of the housing  120 , and elastically supports the housing  120  in a direction in which the housing  120  gets away from the base  110 . 
         [0036]    The present embodiment has been described in connection with the example in which the hinge shaft  131  is inserted into the second coupling hole  121  from the top surface of the housing  120  and then screw-coupled with the first coupling hole  111  of the base  110 . However, the hinge shaft  131  may be inserted into the first coupling hole  111  from the bottom surface of the housing  120  and then screw-coupled with the second coupling hole  121  of the housing  120 . In this case, a spherical surface corresponding to the head portion  131   a  of the hinge shaft  131  is formed on a lower inner circumferential surface of the first coupling hole  111 , and the second coupling hole  121  has a screw thread to be coupled with the hinge shaft  131 . 
         [0037]    Next, an operation of adjusting the dot sight device according to the first embodiment of the present disclosure will be described with reference to  FIGS. 7 to 12 . 
         [0038]    Referring to  FIGS. 7 to 9 , the base  110  is mounted on the rear end of the slide of the small arm P in parallel with the gun barrel, and the bottom portion of the housing  120  is placed on the first accommodating groove  114  of the base  110  to overlap the base  110 . One end of the housing  120  is coupled with the base  110  through the hinge shaft  131  of the connecting member  130 , and the housing  120  is vertically or horizontally rotatable or movable from the base  110  centering on the hinge shaft  131 . 
         [0039]    More specifically, the hinge shaft  131  connects the housing  120  with the base  110  such that the upper end portion of the hinge shaft  131  is coupled with the first coupling hole  111  of the base  110  in the state in which the upper end portion of the hinge shaft  131  comes in close contact with the second coupling hole  121  of the housing  120 . At this time, the spherical surface formed in the inner upper circumferential surface of the second coupling hole  121  comes into close contact with the spherical surface of the head portion  131   a  of the hinge shaft  131 . Further, the elastic support  132  of the ring form through which the hinge shaft  131  passes is interposed between the first coupling hole  111  of the base  110  and the second coupling hole  121  of the housing  120 , and so the base  110  is apart from the housing  120  by a predetermined distance. Through this structure, the housing  120  can rotate or move on the center of the spherical surface in the horizontal direction or the vertical direction in the state in which the spherical surface of the head portion  131   a  of the hinge shaft  131  comes into close contact with the spherical surface of the second coupling hole  121 . Here, the elastic support  132  includes a ring-like member made of polyolefin, polypropylene, polyethylene, or rubber or a ring spring. 
         [0040]    In the state in which the joint  141  of the adjusting member  140  is arranged between the second connecting portion  122  formed at the other end portion and the first connecting portion  112  of the base  110 , the housing  120  is rotated or moved by the horizontal adjusting portion  142  that moves the horizontal adjusting portion  142  in the horizontal direction at the side of the base  110  and the vertical adjusting portion  143  that adjusts the interval between the joint  141  and the housing  120  in the vertical direction at the side of the housing  120 . 
         [0041]    The horizontal adjusting portion  142  is assembled such that the horizontal adjusting portion  142  of the shaft form passes through the first connecting portion  112  to cross the movement space  113 , in which the joint  141  is arranged, in the horizontal direction in the state in which the joint  141  is arranged in the movement space  113  vertically formed in the center of the first connecting portion  112  of the base  110  and is movable in the movement space  113  in the horizontal direction. At this time, both ends of the horizontal adjusting portion  142  are rotatably supported by the first connecting portion  112 , and the central portion of the horizontal adjusting portion  142  is screw-coupled with the horizontal coupling hole  141   a  which is formed in the joint  141  in the horizontal direction. Thus, as the horizontal adjusting portion  142  rotates in the forward direction or the reverse direction, the joint  141  screwed-coupled with the horizontal adjusting portion  142  through the horizontal coupling hole  141   a  moves in the horizontal direction along with the horizontal adjusting portion  142  crossing the movement space  113  in the horizontal direction, so that the position of the housing  120  in the horizontal direction, that is, the horizontal angle between the base  110  and the housing  120  is adjusted. 
         [0042]    Further, the vertical adjusting portion  143  is assembled such that the vertical adjusting portion  143  of the shaft form vertically passes through the second connecting portion  122  arranged at the position corresponding to the movement space  113  of the base  110  at the other end portion of the housing  120  and then is screw-coupled with the vertical coupling hole  141   b  of the joint  141 . The upper end portion of the vertical adjusting portion  143  is rotatably supported by the second connecting portion  122 , and the housing  120  is elastically supported by the elastic member  150  interposed between the base  110  and the housing  120  in the direction (upward direction) in which the housing  120  gets apart from the base  110 . Further, since the joint  141  is coupled with the base  110  side through the horizontal adjusting portion  142 , force of constraint works in the vertical direction. Thus, as the vertical adjusting portion  143  rotates in the forward direction or the reverse direction, the lower end portion of the vertical adjusting portion  143  is fastened into or loosened from the vertical coupling hole  141   b  of the joint  141 , and thus the position of the housing  120  in the vertical direction, that is, the vertical angle between the housing  120  and the base  110  is adjusted since the repulsive force of the elastic member  150  works upward. 
         [0043]    In other words, the horizontal adjusting portion  142  rotatably supported at the base  110  side is screw-coupled with the joint  141  in the horizontal direction, and the vertical adjusting portion  143  rotatably supported at the housing  120  side is screw-coupled with the joint  141  in the vertical direction. Thus, since separate plates used for horizontal and vertical movements in the related art need not be arranged between the base  110  and the housing  120 , the compact dot sight device can be implemented, and thus since the distance between the dot sight device and the gun barrel is minimized, the accuracy rate of the small arm P can be improved. 
         [0044]    In the assembled state as illustrated in  FIG. 3 , a dot reticle image generated such that the dot reticle emitted from the dot reticle generating unit  124  installed on the upper rear end portion of the housing  120  is reflected by the reflective mirror  123  is directed toward the observer&#39;s eye(s), and the observer shoots a gun in the state in which the dot reticle image is aligned with the target viewed through the reflective mirror  123 . 
         [0045]    At this time, when the dot reticle image is not aligned with an aiming point, that is, the target, the dot reticle image is not aligned with an aiming point, that is, the target by adjusting the horizontal angle and/or the vertical angle between the base  110  and the housing  120  using the horizontal adjusting portion  142  and/or the vertical adjusting portion  143 . 
         [0046]    First, an operation of adjusting the horizontal angle between the base  110  and the housing  120  will be described with reference to  FIGS. 10 and 11 . 
         [0047]    When the horizontal adjusting portion  142  that passes through the first connecting portion  112  of the base  110  rotates in the horizontal direction, the horizontal adjusting portion  142  rotates above the base  110  since both ends of the horizontal adjusting portion  142  are supported by the first connecting portion  112 . At this time, the joint  141  screw-coupled with the horizontal adjusting portion  142  through the horizontal coupling hole  141   a  moves left or right in the movement space  113  according to the rotating direction of the horizontal adjusting portion  142 . 
         [0048]    In other words, when the joint  141  coupled at the other end portion through the vertical adjusting portion  143  moves left or right along with the horizontal adjusting portion  142  in the state in which one end of the housing  120  is coupled to be rotatable with respect to the base  110  through the hinge shaft  131 , the housing  120  rotates on the hinge shaft  131  in the left or right direction, and thus the horizontal angle of the housing  120  is adjusted. 
         [0049]    Next, an operation of adjusting the vertical angle between the base  110  and the housing  120  will be described with reference to  FIGS. 11 and 12 . 
         [0050]    The housing  120  is coupled with the joint  141  such that the vertical adjusting portion  143  that passes through the second connecting portion  122  arranged at the other end portion in the vertical direction is screw-coupled with the joint  141 . At this time, the lower end portion of the vertical adjusting portion  143  is screw-coupled with the vertical coupling hole  141   b  of the joint  141  in the state in which the upper end portion of the vertical adjusting portion  143  is supported by the second connecting portion  122 , and the elastic member  150  elastically supports the bottom portion of the housing  120  upward, that is, in the direction in which the housing  120  gets away from the base  110 . Thus, the upper end portion of the vertical adjusting portion  143  constantly comes in close contact with the second connecting portion  122 . 
         [0051]    Further, since the joint  141  is coupled to the first connecting portion  112  of the base  110  through the horizontal adjusting portion  142  and movable only in the horizontal direction, force of constraint that limits movement in the vertical direction or rotation on the same axis line as the axis of the vertical adjusting portion  143  works on the base  110  side. 
         [0052]    Thus, when the vertical adjusting portion  143  that passes through the second connecting portion  122  of the housing  120  in the vertical direction and is screw-coupled with the vertical coupling hole  141   b  of the joint  141  is rotated, the vertical adjusting portion  143  is fastened into or loosened from the vertical coupling hole  141   b  of the joint  141 , and thus the vertical distance between the housing  120  and the joint  141  is adjusted. 
         [0053]    At this time, as described above, the spherical surface formed on the second coupling hole  121  of the housing  120  comes in close contact with the spherical surface formed on the head portion  131   a  of the hinge shaft  131 , and the elastic support  132  is arranged between the first coupling hole  111  and the second coupling hole  121 , and so the distance between the base  110  and the housing  120  is elastically maintained. Thus, when the vertical adjusting portion  143  rotates in the forward direction or the reverse direction, the housing  120  in which the reflective mirror  123  and the dot reticle generating unit  124  are installed vertically rotates or moves on the center of the spherical surfaces of the second coupling hole  121  and the head portion  131   a , and thus the vertical angle of the housing  120  is adjusted. 
         [0054]    As described above, by rotating the horizontal adjusting portion  142  or the vertical adjusting portion  143  in the forward or reverse direction, the optical axis of the reflective mirror  123  arranged on the housing  120  can be adjusted with respect to the axis of the gun barrel in the horizontal or vertical direction, and thus it is possible to align an aiming point of the gun barrel with the position of the dot reticle image reflected by the reflective mirror  123 . Particularly, since the rotational angle of the housing  120  is adjusted in the state in which the reflective mirror  123  and the dot reticle generating unit  124  are fixed to the housing  120 , the relative position between the reflective mirror  123  and the dot reticle generating unit  124  does not change. Thus, a change in the relative position between the mask and the reflective mirror which causes a change in parallax of the dot sigh device is not caused. As a result, it is possible to prevent the dot reticle provided from the dot reticle generating unit  124  from deviating from the focal point of the reflective mirror  123  in the process of adjusting the dot reticle image with the aiming point, that is, the target. 
         [0055]    According to the present disclosure, zeroing (an adjustment of aligning the dot reticle image of the reflective mirror  123  with the aiming point of the gun barrel) is performed by adjusting the rotational angle of the housing  120  in the state in which the reflective mirror  123  and the dot reticle generating unit  124  are fixed to the housing  120 , and thus since the dot reticle provided from the dot reticle generating unit  124  does not deviate from the focal point of the reflective mirror  123 , a directional finite ray aberration of light rays which are reflected from the reflective mirror and then incident on the observer&#39;s eye(s) is maintained constantly as illustrated in  FIG. 2A . 
         [0056]    Next, a dot sight device for used in a small arm according to a second embodiment of the present disclosure will be described below with reference to  FIGS. 13 to 16 . In the second embodiment, the same components as in the first embodiment are denoted by the same reference numerals, and thus a detailed description thereof will be omitted. 
         [0057]    First, referring to  FIGS. 13 and 14 , the dot sight device according to a second embodiment of the present disclosure is different from that according to the first embodiment in that a connecting member  130 ′ that rotatably connects one end of the base  110  with one end of the housing  120  is provided instead of the connecting member  130 . 
         [0058]    The connecting member  130 ′ includes a rotating member  133  arranged between one end of the base  110  and one end of the housing  120 , a vertical connecting shaft  135  that passes through the rotating member  133  and is fixed to the base  110  so that the rotating member  133  and the housing  120  can rotate in the horizontal direction, and a horizontal connecting shaft  134  that passes through both ends of one end of the housing  120  and fixed to the rotating member  133  so that the rotating member  133  and the housing  120  can rotate in the vertical direction. 
         [0059]    Further, a disc-like protrusion  133   a  is formed in the form of a letter “Ω” to protrude from one end of the rotating member  133 , and the vertical connecting shaft  135  passes through the disc-like protrusion  133   a . An arch-like guide  115  that guides the rotation of the rotating member  133  in the horizontal direction is formed on the base  110  to surround a part of the edge of the disc-like protrusion  133   a.    
         [0060]    Meanwhile, in the first embodiment, the axis of the horizontal coupling hole  141   a  intersects with the axis of the vertical coupling hole  141   b  on the same plane, but the joint  141  is configured such that the axis of the horizontal coupling hole  141   a  may not intersect with the axis of the vertical coupling hole  141   b  on the same plane as illustrated in  16 . In other words, the horizontal coupling hole  141   a  and the vertical coupling hole  141   b  may be formed on different planes. 
         [0061]    The assembly and an operation of the connecting member  130 ′ will be described with reference to  FIGS. 15 and 16 . The operations of the horizontal adjusting portion  142  and the vertical adjusting portion  143  are the same as described above in the first embodiment, and thus a description thereof will be omitted. 
         [0062]    In the state in which the disc-like protrusion  133   a  formed to protrude from one end of the rotating member  133  is arranged on the base  110 , the vertical connecting shaft  135  passes through the disc-like protrusion  133   a  in the vertical direction and is coupled with the base  110 . Then, the horizontal connecting shaft  134  that passes through both ends of one end of the housing  120  is coupled with both ends of the other end portion of the rotating member  133 . 
         [0063]    In this state, when the horizontal adjusting portion  142  of the adjusting member  140  arranged at the other end of the base  110  is rotated in order to adjust the horizontal position of the other end portion of the housing  120 , the rotating member  133  arranged to be rotatable or movable in the horizontal direction between the housing  120  and the base  110  rotates or moves on the vertical connecting shaft  135 . 
         [0064]    Further, when the vertical adjusting portion  143  of the adjusting member  140  is rotated in order to adjust the vertical position of the other end portion of the housing  120 , the housing  120  rotates on the horizontal connecting shaft  134  in the vertical direction. 
         [0065]    Meanwhile, the vertical connecting shaft  135  passes through the disc-like protrusion  133   a  of the rotating member  133  in the vertical direction and is then coupled with the base  110 , and since the arch-like guide  115  surrounding the edge of the disc-like protrusion  133   a  is formed on the base  110 , the assembly position of the base  110  and the rotating member  133  is guided, and it is possible to prevent shock caused by shooting from being concentrated on the vertical connecting shaft  135 . 
         [0066]    Meanwhile, for example, a bush functioning to minimize friction between the base  110  and the disc-like protrusion  133   a  may be arranged between the disc-like protrusion  133   a  and the base  110  for smooth rotation of the rotating member  133 . 
         [0067]    According to the embodiments of the present disclosure, it is possible to provide a dot sight device for use in a small arm which is capable of aligning a principal ray with a gun barrel of a small arm without causing a change in a relative position between a dot mask and a reflective mirror, that is, without causing a change in parallax of a dot sight device. 
         [0068]    Further, it is possible to provide a compact dot sight device for use in a small arm which is capable of increasing an accuracy rate of a small arm. 
         [0069]    While preferred embodiments have been described and illustrated above, it should be understood that these have been presented by way of example only, and are not limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present invention. Furthermore, the above advantages and features are provided in described embodiments, but shall not limit the application of such issued claims to processes and structures accomplishing any or all of the above advantages. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims and their equivalents. 
         [0070]    Additionally, the section headings herein are provided for consistency with the suggestions under 37 C.F.R. 1.77 or otherwise to provide organizational cues. These headings shall not limit or characterize the invention(s) set out in any claims that may issue from this disclosure. Specifically and by way of example, a description of a technology in the “Background” is not to be construed as an admission that technology is prior art to any invention(s) in this disclosure. Neither is the “Summary” to be considered as a characterization of the invention(s) set forth in issued claims. Furthermore, any reference in this disclosure to “invention” in the singular should not be used to argue that there is only a single point of novelty in this disclosure. Multiple inventions may be set forth according to the limitations of the multiple claims issuing from this disclosure, and such claims accordingly define the invention(s), and their equivalents, that are protected thereby. In all instances, the scope of such claims shall be considered on their own merits in light of this disclosure, but should not be constrained by the headings set forth herein.