Patent Publication Number: US-2021191120-A1

Title: Head-up display for vehicle having improved coupling structure

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority from and the benefit of Korean Patent Application No. 10-2019-0172513, filed on Dec. 20, 2019, which is hereby incorporated by reference for all purposes as if set forth herein. 
     BACKGROUND 
     Field 
     Exemplary embodiments relate to a head-up display for a vehicle, and more particularly, to a head-up display device for a vehicle having an improved coupling structure between a screen, and a folding mirror and an aspheric mirror. 
     Discussion of the Background 
     In recent years, the automobile market is rapidly growing with the trend of favoring intelligent vehicles equipped with advanced information technology (IT) and convenient functions as well as the improvement of original functions of vehicles. In such a trend, with the spreading of the electronic equipment of vehicles, functions, in which IT and wireless communication technology are integrated, are rapidly increasing. 
     In particular, products that support the driver&#39;s stability and convenience are being released, and as one of the products, a head-up display (HUD) for a vehicle is attracting attention as a variety of product lines. 
     In general, a vehicle head-up display is a device that displays an image including vehicle speed, a fuel level, road guidance information, and the like on a windshield that is a front window of a vehicle. 
     Among components constituting such a vehicle head-up display, a folding mirror may be deformed according to a push position and a push force for the folding mirror, and image distortion may occur due to the deformation thereof. 
     On the other hand, in the conventional aspheric mirror mounting structure, one side of an elastic body for pressing a spherical mount portion has a hook shape, and the other side thereof often has a shape for screw coupling. 
     Such a structure has a problem in that a gap may occur in an aspheric mirror due to permanent deformation of an elastic body when an unexpected large impact or the like is applied to the aspheric mirror. 
     The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and, therefore, it may contain information that does not constitute prior art. 
     SUMMARY 
     Exemplary embodiments of the present invention provide an improved coupling structure between a screen, and a folding mirror, and an aspheric mirror, thereby preventing deformation of the folding mirror and allowing a spherical mount of the aspheric mirror to maintain a fixing force. 
     Additional features of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. 
     An exemplary embodiment of the present invention provides a head-up display for a vehicle having an improved coupling structure including a screen, and a folding mirror snap-fit-coupled to the screen. 
     The screen may include an opening formed to pass through a portion thereof connected to the folding mirror, stoppers disposed around the opening to hold side surfaces of the folding mirror, and fixing holders disposed at peripheries of the stoppers to hold an upper surface, a lower surface, and a side surface of the folding mirror. 
     A portion of the fixing holder may protrude inward toward the opening and may be forcibly fitted into the folding mirror. 
     The fixing holder may have a “ ” shape in which an upper end thereof is gradually inclined toward a lower portion thereof. 
     The fixing holder may have a shape in which an upper end thereof is gradually inclined toward a lower portion thereof, and a portion thereof configured to hold the folding mirror may be formed in a “⊏” shape so as to fix a side end of the folding mirror. 
     The fixing holder may include an upper frame configured to hold the upper surface of the folding mirror, a side frame configured to hold the side surface of the folding mirror, and a lower frame configured to hold the lower surface of the folding mirror. 
     An upper end of the upper frame may have a chamfered structure. 
     Another exemplary embodiment of the present invention provides a head-up display for a vehicle having an improved coupling structure including a screen and a folding mirror cover snap-fit-coupled to the screen, and a folding mirror fixed between the screen and the folding mirror cover. 
     The screen may include an opening of which one side is open, stoppers disposed around the opening and in contact with the folding mirror, and connection parts disposed at peripheries of the stoppers and coupled to the folding mirror cover through concave-convex coupling. 
     The connection part may include a fixing step formed to protrude outward and a grip member formed to protrude at a periphery of the fixing step. 
     The folding mirror cover may include a fixing latch fitted on and coupled to the fixing step and a fixing bar fitted into and coupled to the grip member. 
     The screen may further include seating surfaces which are disposed between the opening and the stoppers and are in surface contact with lower surfaces of side ends of the folding mirror. 
     The folding mirror cover may include a pushing member formed at a position facing the seating surface and in surface contact with the folding mirror. 
     The folding mirror cover may have a fixing hole formed to pass therethrough at a position corresponding to the seating surface, and the pushing member may be connected to a lower end of the fixing hole and may reciprocate in a forward direction toward the seating surface and a rearward direction opposite to the seating surface. 
     The pushing member may include a fixing part connected to the lower end of the fixing hole, and a pressing part which is formed to extend from the fixing part and reciprocates in the forward and backward directions of the fixing hole in a state of being fixed to the fixing hole. 
     The pressing part may be in surface contact with the folding mirror. 
     Another exemplary embodiment of the present invention provides a head-up display for a vehicle having an improved coupling structure including a lower case, an aspheric mirror including spherical mounts formed at both ends thereof so as to be rotatably connected to the lower case, and a screen connected to the lower case and including a leaf spring configured to limit a displacement of the spherical mount with a predetermined fixing force. 
     The lower case may include a vertical coupling groove having a height relatively greater than a diameter of the spherical mount, and the vertical coupling groove may be bolt-coupled to the screen. 
     The leaf spring may fix the spherical mount by protruding in a direction, in which the leaf spring is in contact with the spherical mount, by as much as a difference between the height of the vertical coupling groove and the diameter of the spherical mount. 
     The leaf spring may have a snap-fit coupling structure detachably coupled to a coupling hole formed in the screen. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. 
         FIG. 1  is a schematic view for describing a head-up display for a vehicle according to a first embodiment of the present invention. 
         FIG. 2  is a view illustrating a screen in the head-up display for a vehicle according to the first embodiment of the present invention. 
         FIG. 3  is a view illustrating a coupling state between the screen and a folding mirror in the head-up display for a vehicle according to the first embodiment of the present invention. 
         FIGS. 4A to 4C  are views illustrating a process in which the folding mirror is mounted on the screen in the head-up display for a vehicle according to the first embodiment of the present invention. 
         FIG. 5  is a view illustrating a fixing holder of the screen for fixing the folding mirror in the head-up display for a vehicle according to the first embodiment of the present invention. 
         FIG. 6  is a view illustrating a push structure of the fixing holder for fixing the folding mirror in the head-up display for a vehicle according to the first embodiment of the present invention. 
         FIG. 7  is a schematic view illustrating a folding mirror cover for fixing a folding mirror and a screen in a head-up display for a vehicle according to a second embodiment of the present invention. 
         FIG. 8  is a view illustrating a reference position of the folding mirror mounted on the screen in the head-up display for a vehicle according to the second embodiment of the present invention. 
         FIGS. 9 to 13  are views illustrating a state in which the folding mirror cover and the screen are coupled to each other with the folding mirror interposed therebetween in the head-up display for a vehicle according to the second embodiment of the present invention. 
         FIG. 14  is a view illustrating the screen in the head-up display for a vehicle according to the second embodiment of the present invention. 
         FIG. 15  is a view illustrating the folding mirror cover in the head-up display for a vehicle according to the second embodiment of the present invention. 
         FIGS. 16 and 17A to 17C  are views illustrating a mounting state between an aspheric mirror and a lower case in a head-up display for a vehicle according to a third embodiment of the present invention. 
         FIGS. 18 and 19A to 19B  are views illustrating a state in which a leaf spring is mounted on a screen in the head-up display for a vehicle according to the third embodiment of the present invention. 
         FIG. 20  is a view illustrating a state in which the screen mounted with the leaf spring and the lower case are coupled to each other with the aspheric mirror interposed therebetween in the head-up display for a vehicle according to the third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS 
     The advantages and features of the present invention and methods for accomplishing the same will be more clearly understood from embodiments to be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments but may be implemented in various different forms. Rather, these embodiments are provided only to complete the disclosure of the present invention and to allow those skilled in the art to understand the category of the present invention. The present invention is defined by the category of the claims. Meanwhile, terms used in this specification are to describe the embodiments and are not intended to limit the present invention. As used herein, singular expressions, unless defined otherwise in context, include plural expressions. It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated components, steps, operations, and/or elements, but do not preclude the presence or addition of one or more other components, steps, operations, and/or elements. 
     A head-up display for a vehicle according to the present invention is basically provided in a vehicle and is installed at a lower portion of a windshield. In the present invention, a coupling structure between components of such a head-up display for a vehicle will be described through first to third embodiments. 
     Accordingly, components related to the features of the present invention will be mainly described, and components separate from the features will be omitted. 
     Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     First Embodiment 
       FIG. 1  is a schematic view for describing a head-up display for a vehicle according to a first embodiment of the present invention. 
     Referring to  FIG. 1 , a head-up display  100  for a vehicle is a device that provides head-up display (HUD) information (vehicle operation information such as vehicle driving information or navigation information) within a range that does not deviate from a driver&#39;s front visual field, that is, a driver&#39;s main visual field. 
     The head-up display  100  for a vehicle includes a cover lens  110 , an upper case  120 , a screen  130 , a folding mirror  140 , an aspheric mirror  160 , a board assembly  170 , a lower case  180 , and a light-emitting diode (LED) assembly  190 . 
     Here, the head-up display  100  for a vehicle according to the first embodiment relates to a coupling structure between the screen  130  and the folding mirror  140  and has a structure that does not require a folding mirror cover (not shown in  FIG. 1 ). 
     Accordingly, the head-up display  100  for a vehicle according to the first embodiment provides an improved coupling structure by applying a snap-fit structure between the screen  130  and the folding mirror  140 . 
     In addition, in the first embodiment, the separate folding mirror cover is not required to fix the folding mirror  140 , thereby reducing costs. 
     Furthermore, descriptions of general components constituting the head-up display  100  for a vehicle will be omitted, and the screen  130  and the folding mirror  140  featured in the first embodiment will be described with reference to the accompanying drawings. 
       FIG. 2  is a view illustrating the screen in the head-up display for a vehicle according to the first embodiment of the present invention, and  FIG. 3  is a view illustrating a coupling state between the screen and the folding mirror. 
     Referring to  FIGS. 2 and 3  together, the screen  130  is connected to the folding mirror  140  in a snap-fit coupling structure. In this case, the screen  130  includes an opening  131 , stoppers  132 , and fixing holders  133 . 
     The opening  131  is formed to pass through a portion connected to the folding mirror  140 . In this case, the opening  131  has a width relatively smaller than a width of the folding mirror  140 . This is to seat side ends of the folding mirror  140 . 
     Here, the width of the opening  131  refers to a size within a range that does not limit a reflection path of the folding mirror  140 . 
     The stoppers  132  are provided to hold side surfaces of the folding mirror  140  around the opening  131 . In this case, in terms of fixing the folding mirror  140 , the plurality of stoppers  132  may be formed at intervals. 
     The interval between the stoppers  132  may correspond to the width of the folding mirror  140 . 
     The plurality of fixing holders  133  are disposed at peripheries of the stoppers  132 . The fixing holder  133  has a structure in which a portion of the fixing holder  133  protrudes inward toward the opening  131  so that the folding mirror  140  is forcibly fitted into the fixing holder  133 . 
     The fixing holders  133  hold upper, lower, and side surfaces of the folding mirror  140 . This is to prevent the deformation of the folding mirror  140 . 
     As a result, the fixing holders  133  effectively fix the three surfaces (upper, lower, and side surfaces) of the folding mirror  140  to prevent the deformation of the folding mirror  140 . 
     Describing the fixing holders  133  in a direction shown in  FIG. 3 , the fixing holders  133  disposed at a right side push and fix the folding mirror  140  in two push directions P 1  and P 2 . 
     In this case, the folding mirror  140  pushed from the fixing holders  133  at the right side is fixed in a fixed line in which the fixing holders  133  at a left side are disposed. 
       FIG. 4  is a view illustrating a process in which the folding mirror is mounted on the screen in the head-up display for a vehicle according to the first embodiment of the present invention. 
     Referring to  FIGS. 4A to 4C , in a state in which the folding mirror  140  is fitted into the left fixing holders  133  of the screen  130 , the folding mirror  140  is moved downward so as to be fitted into the right fixing holders  133 . 
     Here, the fixing holders  133  may be divided into push portions P formed at an interval at one side (right side) to fix the folding mirror  140  and holder portions H formed at an interval at the other side (left side) to seat the folding mirror  140 . 
     In this case, the folding mirror  140  has a structure in which the folding mirror  140  is fixed by being pushed leftward from the push portions P in a state of being seated in the holder portions H. 
     That is, the fixing holder  133  pushes the folding mirror  140  in a direction from one (right) side to the other (left) side to fix the folding mirror  140 . 
     The fixing holder  133  may have a “ ” shape in which an upper end thereof is gradually inclined toward a lower portion thereof. This is to enable the folding mirror  140  to be forcibly fixed into the fixing holder  133  smoothly. 
       FIG. 5  is a view illustrating the fixing holder of the screen for fixing the folding mirror in the head-up display for a vehicle according to the first embodiment of the present invention, and  FIG. 6  is a view illustrating a push structure of the fixing holder for fixing the folding mirror. 
     Referring to  FIGS. 5 and 6  together, the fixing holder  133  has a shape in which the upper end is gradually inclined toward the lower portion. This is to enable the folding mirror  140  to be moved from an upper portion to the lower portion of the fixing holder  133  and forcibly fitted into the fixing holder  133 . 
     In this case, in the fixing holder  133 , an (inner) portion thereof for holding the folding mirror may be formed in a “ ” shape so as to fix a side end of the folding mirror  140 . 
     Here, the fixing holder  133  may include an upper frame  133   a , a side frame  133   b , and a lower frame  133   c.    
     The upper frame  133   a  is a section that holds an upper surface of the folding mirror  140  and has a chamfered structure. 
     A lower end of the upper frame  133   a  may be in surface contact with the upper surface of the folding mirror  140 . Accordingly, the lower end of the upper frame  133   a  is parallel to the upper surface of the folding mirror  140 . 
     As a result, the upper frame  133   a  can firmly seat the upper surface of the folding mirror  140  so as to not be shaken. 
     The side frame  133   b  is a section that holds the side surface of the folding mirror  140 . 
     The lower frame  133   c  is a section that holds a lower surface of the folding mirror  140 . In this case, the lower frame  133   c  is formed in a flat shape like the upper frame  133   a.    
     Accordingly, the fixing holders  133  may stably seat and fix the upper surface, the side surface, and the lower surface of the folding mirror  140 . As a result, the fixing holder  133  can prevent the deformation of the folding mirror  140 . 
     As shown in  FIG. 6 , the fixing holder  133  can secure an overlap amount according to the push form thereof. Here, the overlap amount refers to an allowable displacement amount of the fixing holder  133 . 
     Since the fixing holder  133  has a structure that pushes and fixes the folding mirror  140 , it is possible to secure an upper surface overlap amount d 1  and a side surface overlap amount d 2 . 
     Second Embodiment 
       FIG. 7  is a schematic view illustrating a folding mirror cover for fixing a folding mirror and a screen in a head-up display for a vehicle according to a second embodiment of the present invention. 
     Referring to  FIG. 7 , unlike the first embodiment, a folding mirror cover  150  is applied to the second embodiment of the present invention. The folding mirror cover  150  is snap-fit-coupled to a screen  130  with a folding mirror  140  interposed therebetween. 
       FIG. 8  is a view illustrating a reference position of the folding mirror mounted on the screen in the head-up display for a vehicle according to the second embodiment of the present invention. 
     Referring to  FIG. 8 , the screen  130  includes stoppers  132  that are disposed around an opening (see  131  of  FIG. 14 ) and are in contact with the folding mirror  140 . 
     The stoppers  132  serve to fix side surfaces of the folding mirror  140  and provide a reference position for mounting the folding mirror  140 . 
     That is, when the folding mirror  140  is pushed in a side push direction P 3 , the stopper  132  fixes the side surface of the folding mirror  140 . 
     The screen  130  includes connection parts  134  formed at a periphery of the stopper  132 . 
     In this case, the connection part  134  includes a fixing step  134   a  and a grip member  134   b.    
     The fixing step  134   a  is formed to protrude outward from the opening. 
     The grip member  134   b  is formed to protrude from a periphery of the fixing step  134   a . The grip member  134   b  is formed in a “ ” shape and has a structure that allows an object to be surrounded. 
     The connection part  134  is coupled with the folding mirror cover (see  150  of  FIG. 9 ) to be described through concave-convex coupling. Such a coupling relationship will be described with reference to the accompanying drawings. 
       FIGS. 9 to 13  are views illustrating a state in which the folding mirror cover and the screen are coupled to each other with the folding mirror interposed therebetween in the head-up display for a vehicle according to the second embodiment of the present invention.  FIG. 14  is a view illustrating the screen in the head-up display for a vehicle according to the second embodiment of the present invention. 
     First, referring to  FIGS. 9 to 13  together, the folding mirror cover  150  includes fixing latches  153  and fixing bars  154 . 
     The fixing latch  153  is fitted on and coupled to the fixing step  134   a  and has a ring shape. The fixing latch  153  may be bent and formed to correspond to a portion of the screen  130  to which the fixing latch  153  is coupled. 
     A sequence of coupling the folding mirror cover  150  will be described based on a direction shown in  FIG. 9 . 
     First, the fixing latch  153  at a right side is fitted on and coupled to the fixing step  134   a  at a right side. 
     Second, a lower end of the folding mirror cover  150  is connected to a connection part disposed at a lower end of the screen  130 . 
     Third, the fixing latch  153  at a left side is fitted on and coupled to the fixing step  134   a  at a left side. 
     In this case, the folding mirror cover  150  and the screen  130  are in surface contact with each other in the first and second sequences above and are in line contact with each other in the third sequence. 
     Meanwhile, as shown in  FIGS. 12 to 14 , the screen  130  includes a plurality of seating surfaces  135  that are disposed between the opening  131  and the stoppers  132  and are in surface contact with lower surfaces of side ends of the folding mirror  140 . 
     In this case, a surface contact direction of the seating surface  135  is described as an example for ease of description, and when a portion, at which the folding mirror  140  and the folding mirror cover  150  are in contact with each other, is a lower surface of a side end, the surface contact direction of the seating surface  135  is a direction of an upper surface of the side end. 
     In other words, the surface contact direction of the seating surface  135  is only a direction opposite to the folding mirror cover  150  and is not limited to the upper surface or the lower surface. 
     An uneven portion (not shown) may be formed at a portion of the seating surface  135 , which is in surface contact with the folding mirror  140 , so as to have predetermined surface roughness. 
     The folding mirror cover  150  may include a pushing member  151  that is formed at a position facing the seating surface  135  and is in surface contact with the folding mirror  140 . 
       FIG. 15  is a view illustrating the folding mirror cover in the head-up display for a vehicle according to the second embodiment of the present invention. 
     Referring to  FIG. 15 , the folding mirror cover  150  has fixing holes  152  formed to pass therethrough at positions corresponding to the seating surfaces  135 . 
     In this case, the pushing member  151  is connected to a lower end of the fixing hole  152 . The pushing member  151  may reciprocate in a forward direction toward the seating surface  135  and a rearward direction opposite to the seating surface  135 . 
     That is, the pushing member  151  has a shape in which an upper end of the pushing member  151  is movable in forward and rearward directions of the fixing hole  152  in a state in which a lower end thereof is fixed to the fixing hole  152 . 
     The pushing member  151  includes a fixing part  151   a  and a pressing part  151   b.    
     The fixing part  151   a  is connected to the lower end of the fixing hole  152 . 
     The pressing part  151   b  is formed to extend from the fixing part  151   a . The pressing part  151   b  may reciprocate in the forward and rearward directions of the fixing hole  152  in a state in which the fixing part  151   a  is fixed to the fixing hole  152 . 
     In this case, the pressing part  151   b  may be in surface contact with the folding mirror (see  140  of  FIG. 13 ). 
     Meanwhile, the folding mirror cover  150  provides dimension measurement surfaces (not shown) in three areas thereof in order to facilitate dimension measurement. Here, the dimension measurement surfaces in the three areas may be formed at an interval in partial sections of an upper end portion and side portions of the folding mirror cover  150  in which the pushing members  151  are formed. 
     Third Embodiment 
       FIGS. 16 and 17A to 17C  are views illustrating a mounting state between an aspheric mirror and a lower case in a head-up display for a vehicle according to a third embodiment of the present invention. 
     Referring to  FIGS. 16 and 17A to 17C  together, an aspheric mirror  160  includes spherical mounts  161  formed at both ends thereof so as to be rotatably connected to a lower case  180 . 
     The lower case  180  includes a V block formed at a portion corresponding to the spherical mount  161 . In this case, x, y, and z-axis rotation directions and β and γ rotation directions of the aspheric mirror  160  are constrained. That is, the aspheric mirror  160  is allowed to be rotated only in an a rotation direction. 
       FIGS. 18 and 19A to 19B  are views illustrating a state in which a leaf spring is mounted on a screen in the head-up display for a vehicle according to the third embodiment of the present invention. 
     Referring to  FIGS. 18 and 19A to 19B  together, a screen  130  is connected to the lower case (see  180  of  FIGS. 16 and 17A to 17C ). 
     In this case, the screen  130  is provided with a leaf spring  137  in order to limit a displacement of the spherical mount (see  161  of  FIGS. 16 and 17A to 17C ) of the aspheric mirror (see  160  of  FIGS. 16 and 17A to 17C ). 
     The leaf spring  137  has a snap-fit coupling structure detachably coupled to a coupling hole  136  formed in the screen  130 . 
     The leaf spring  137  includes a pressing portion  137   a  and a hook portion  137   b.    
     The pressing portion  137   a  is a portion that protrudes downward from the coupling hole  136  by a predetermined interval and is in direct contact with the spherical mount (see of  161  in  FIGS. 16 and 17A to 17C ). 
     The hook portion  137   b  is snap-fit-coupled to the coupling hole  136  so that the leaf spring  137  is firmly fixed to the coupling hole  136 . 
       FIG. 20  is a view illustrating a state in which the screen mounted with the leaf spring and the lower case are coupled to each other with the aspheric mirror interposed therebetween in the head-up display for a vehicle according to the third embodiment of the present invention. 
     Referring to  FIG. 20 , the leaf spring  137  of the screen  130  limits the displacement of the spherical mount  161  of the aspheric mirror  160  with a predetermined fixing force. 
     In this case, the lower case  180  has a vertical coupling groove  181  having a height L 2  relatively greater than a diameter D of the spherical mount  161 . 
     The vertical coupling groove  181  is bolt-coupled to the screen  130 . 
     The lower case  180  includes a seating block  182  positioned to be vertically collinear with the leaf spring  137  with the spherical mount  161  interposed therebetween. 
     The seating block  182  seats the aspheric mirror  160  under the aspheric mirror  160  to have a function of preventing a gap from occurring at a joint of the aspheric mirror  160  and also allowing the aspheric mirror  160  to be rotated only in a rotation direction. 
     That is, the seating block  182  serves to prevent a gap from occurring when the spherical mount  161  rotates. 
     Accordingly, the seating block  182  has a shape corresponding to the spherical mount  161 . For example, the seating block  182  may have a shape such as a “V” shape capable of stably seating the spherical mount  161  under the spherical mount  161 . 
     Here, the leaf spring  137  protrudes in a direction, in which the leaf spring  137  is in contact with the spherical mount  161 , by as much as a difference between the height L 2  of the vertical coupling groove  181  and the diameter D of the spherical mount  161 . 
     That is, the leaf spring  137  fixes the spherical mount  161  with a force F corresponding to a protruding length L 1 . 
     In other words, when the screen  130  to which the leaf spring  137  is assembled is coupled to the lower case  180  using a bolt B, unless an amount of impact is applied sufficiently to damage the bolt coupling, the spherical mount  161  of the aspheric mirror  160  is moved only by as much as the protruding length L 1 . 
     Here, the force F corresponding to the protruding length L 1 , which is an overlap amount of the leaf spring  137 , acts as a fixing force for the aspheric mirror  160 . 
     As described above, according to the present invention, a coupling structure between a screen, and a folding mirror and a folding mirror cover can be improved to prevent the deformation of the folding mirror. 
     In particular, according to the present invention, a snap-fit structure is applied between the screen and the folding mirror to form an integrated structure, thereby providing an improved coupling structure. 
     In addition, the present invention provides a structure capable of coupling a folding mirror according to the presence or absence of a folding mirror cover. 
     In this case, when the folding mirror cover is present, the push position of the folding mirror coincides with a seating surface of the folding mirror. Accordingly, the deformation of the folding mirror can be prevented, thereby preventing the distortion of a head-up display (HUD) image. 
     On the other hand, when the folding mirror cover is not present, the folding mirror is formed in response to the absent of the folding mirror cover, thereby reducing costs. 
     In addition, according to the present invention, unless an amount of impact is applied sufficiently to damage bolt coupling, a displacement of the aspheric mirror is limited by as much as an overlap amount of a leaf spring, thereby effectively fixing a fixed portion of the aspheric mirror without a gap. 
     The present invention is not limited to the above-described embodiments and can be variously modified and implemented without departing from the scope and spirit of the present invention.