Patent Publication Number: US-2023138416-A1

Title: Vehicular lamp fitting, radar-cover removing method, and radar-cover attaching method

Description:
BACKGROUND 
     The present disclosure relates to a vehicular lamp fitting, a method for removing a radar cover, and a method for attaching a radar cover. In particular, the present disclosure relates to a vehicular lamp fitting, a method for removing a radar cover, and a method for attaching a radar cover, capable of preventing the distance between a radar unit and the radar cover from changing (and as a result, preventing noises from occurring in electromagnetic waves (radar signals) that pass through the radar cover and are transmitted to an area around the vehicle). 
     Japanese Unexamined Patent Application Publication No. 2020-38181 discloses a vehicular lamp fitting including a lamp housing, a radar unit (a radar apparatus) attached to a plate-like part extending downward from the lower part of the lamp housing, and a radar cover disposed in front of the radar unit (see, in particular, FIG. 2 of Japanese Unexamined Patent Application Publication No. 2020-38181). The radar unit is used for detecting an object by transmitting a high-frequency electromagnetic wave (e.g., millimeter wave) around a vehicle and receiving a reflected wave from the object existing within a transmission range of the electromagnetic wave. 
     SUMMARY 
     However, in the vehicular lamp fitting disclosed in Japanese Unexamined Patent Application Publication No. 2020-38181, the radar unit and the radar cover are fixed to respective components different from each other. Therefore, the radar unit and the radar cover vibrate in different manners from each other due to vibrations of the vehicle on which the vehicular lamp fitting is mounted (e.g., due to vibrations thereof during the traveling), so that the distance between the radar unit and the radar cover changes one after another. Consequently, electromagnetic waves transmitted by the radar unit (traveling waves) and electromagnetic waves reflected by the radar cover (reflected waves) interfere with each other. As a result, when the traveling wave and the reflected wave interfere with each other, the following problem occurs. That is, the transmission power increases or decreases according to the phase states of these waves, so that they become an electromagnetic wave like one in which an amplitude modulation is superimposed on the traveling wave, and noises occur in electromagnetic waves (radar signals) that pass though the radar cover and are transmitted to an area around the vehicle. 
     The present disclosure has been made in order to solve the above-described problem, and an object thereof is to provide a vehicular lamp fitting, a method for removing a radar cover, and a method for attaching a radar cover, capable of preventing the distance between a radar unit and the radar cover from changing (and as a result, preventing noises from occurring in electromagnetic waves (radar signals) that pass through the radar cover and are transmitted to an area around the vehicle). 
     A vehicular lamp fitting according to an aspect includes: a lamp housing; an outer lens attached to the lamp housing in a state covering an opening of the lamp housing and forming a first space between the outer lens and the lamp housing; a lamp unit disposed in the first space; a radar housing; a radar cover attached to the radar housing in a state covering an opening of the radar housing, and forming a second space between the radar cover and the radar housing; a radar unit disposed in the second space; a first fixing part fixing detachably the radar unit to the radar housing; and a second fixing part fixing detachably the radar cover to the radar housing. By the above-described configuration, it is possible to prevent the distance between the radar unit and the radar cover from changing (and as a result, to prevent noises from occurring in electromagnetic waves (radar signals) that pass through the radar cover and are transmitted to an area around the vehicle). 
     This is because the radar unit and radar cover are fixed to one and the same radar housing. That is, this is because since the radar unit and the radar cover are fixed to the same radar housing, the radar unit and the radar cover vibrate similarly by vibration (For example, vibration during driving) of a vehicle on which the vehicular lamp fitting is mounted, and as a result, the distance between the radar unit and the radar cover does not change. Further, there is another advantage that the effect of the heat (the heat generated by the lamp unit) on the radar unit can be reduced. This is because the radar unit is disposed in the second space (formed by the radar housing and the radar cover) in which the temperature is lower than that in the first space (formed by the lamp housing and the outer lens) where the temperature is raised due to the heat generated by the lamp unit. 
     Further, there is an advantage that maintenance can be easily performed when the radar unit fails. This is because, since the radar unit and the radar cover are detachably fixed, the radar unit can be replaced by removing the radar cover from the radar housing without removing the vehicular lamp fitting itself from the vehicle. 
     Further, in the above-described vehicular lamp fitting, in the lamp housing and the radar housing, an opening of the lamp housing and an opening of the radar housing adjacent to each other may be connected to each other by a connecting part. 
     Further, in the above-described vehicular lamp fitting, a side surface of the lamp housing and a side surface of the radar housing may be opposed to each other with a space therebetween. 
     In this way, the effect of the heat (the heat generated by the lamp unit) on the radar unit can be further reduced. 
     Further, in the above-described vehicular lamp fitting, the lamp housing, the radar housing, and the connecting part may be formed as an integrated component by injection molding. 
     As a result, the radar housing can be arranged with high accuracy with respect to the lamp housing as compared with the case where the lamp housing and the radar housing are individually molded and the both are combined as an assembly. Therefore, it is possible to suppress the variation of the detection areas of the radar unit. 
     Further, in the above-described vehicular lamp fitting, the outer lens may be welded to the opening of the lamp housing and the connecting part. 
     Further, in the above-described vehicular lamp fitting, the radar housing may be disposed below the lamp housing. 
     Further, in the above-described vehicular lamp fitting, the first fixing part may be provided in the radar housing. Further, the above-described vehicular lamp fitting may further include a bracket fixed to the radar housing, and the first fixing part may be provided in the bracket. 
     In this way, radar units having various shapes can be fixed to the radar housing by replacing the bracket by other brackets without changing the shape of the radar housing. 
     Further, in the above-described vehicular lamp fitting, an end of the outer lens and an end of the radar cover may be opposed to each other. The end of the outer lens may include a first extension part extending beyond the connecting part to a radar cover side. Further, the end of the radar cover may include a second extension part extending from the end of the radar cover to an area behind the first extension part. 
     Further, in the above-described vehicular lamp fitting, the second extension part may extend in an arc shape around the connecting part. In this way, even when the radar housing (and the radar cover and the radar unit fixed to the radar housing) shakes (or sways) around the connecting part, interference (e.g., a collision) between the ends of the outer lens and the radar cover, which are opposed to each other, can be prevented. Further, in the above-described vehicular lamp fitting, the outer lens may be transparent to visible light, and the radar cover may be opaque to visible light. 
     Further, in the above-described vehicular lamp fitting, the vehicular lamp fitting may be mounted on a vehicle to which a bumper is attached, and the radar cover may be removed from the radar housing without causing the radar cover to interfere with the bumper by making the second extension part of the radar cover abut against the end of the outer lens and rotating the radar cover around a point at which the radar cover abuts against the end of the outer lens. 
     By the above-described configuration, when the radar cover is removed from the radar housing, the radar cover can be removed without causing the end of the radar cover to come into contact with the end of the bumper. Therefore, it is possible to prevent the bumper from being damaged due to the removal of the radar cover. 
     Further, in the above-described vehicular lamp fitting, the vehicular lamp fitting which can be mounted on a vehicle to which a bumper is attached, the radar cover may be attached to the radar housing without causing the radar cover to interfere with the bumper by making the second extension part of the radar cover abut against the end of the outer lens and rotating the radar cover around a point at which the radar cover abuts against the end of the outer lens. 
     By the above-described configuration, when the radar cover is attached to the radar housing, the radar cover can be removed without causing the edge of the radar cover to come into contact with the edge of the bumper. Therefore, it is possible to prevent the bumper from being damaged due to the attaching of the radar cover. 
     Further, in the above-described vehicular lamp fitting, an end of the radar cover and an end of the bumper that are opposed to each other may be formed in such a shape that a gap between these ends becomes wider toward a rear. 
     A method for removing a radar cover according to another aspect is a method for removing a radar cover from a radar housing in a vehicular lamp fitting, including: making a second extension part of the radar cover abut against an end of the outer lens; and rotating the radar cover around a point at which the second extension part of the radar cover abuts against the end of the outer lens, and thereby removing the radar cover from the radar housing without causing the radar cover to interfere with a bumper. 
     A method for attaching a radar cover according to another aspect is a method for attaching a radar cover to a radar housing in a vehicular lamp fitting, including: 
     making a second extension part of the radar cover abut against an end of the outer lens; and rotating the radar cover around a point at which the second extension part of the radar cover abuts against the end of the outer lens, and thereby attaching the radar cover from the radar housing without causing the radar cover to interfere with a bumper. 
     According to the present disclosure, it is possible to provide a vehicular lamp fitting, a method for removing a radar cover, and a method for attaching a radar cover, capable of preventing the distance between a radar unit and the radar cover from changing (and as a result, preventing noises from occurring in electromagnetic waves (radar signals) that pass through the radar cover and are transmitted to an area around the vehicle). 
     The above and other objects, features and advantages of the present disclosure will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not to be considered as limiting the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a front view of a vehicular lamp fitting  10 ; 
         FIG.  2    is an exploded perspective view of the vehicular lamp fitting  10 ; 
         FIG.  3    is a cross-sectional view taken along a line A-A in  FIG.  1   ; 
         FIG.  4    is a cross-sectional view taken along a line B-B in  FIG.  1   ; 
         FIG.  5 A  shows a bezel  90  before it is attached; 
         FIG.  5 B  shows the bezel  90  after it is attached; 
         FIG.  6    is a modified example of a vehicular lamp fitting  10 ; 
         FIG.  7 A  shows a state in which a radar cover  60  is removed from a radar housing  50 ; 
         FIG.  7 B  shows a state in which the radar cover  60  is removed from the radar housing  50 ; and 
         FIG.  7 C  shows a state in which the radar cover  60  is removed from the radar housing  50 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A vehicular lamp fitting  10 , which is an embodiment according to the present disclosure, will be described hereinafter with reference to the attached drawings. 
     The same reference numerals (or symbols) are attached to corresponding components throughout the drawings, and redundant explanations thereof are omitted as appropriate. 
       FIG.  1    is a front view of the vehicular lamp fitting  10 . The vehicular lamp fitting  10  according to this embodiment is a signal lighting fixture for a vehicle (hereinafter also referred to as a vehicle signal lighting fixture) that functions as a rear combination lamp, and is mounted on each of the left and right sides of the rear end of a vehicle such as an automobile (not shown). Since the vehicular lamp fittings  10  mounted on both the left and right sides of the rear end of the vehicle are symmetrical to each other, only the vehicular lamp fitting  10  mounted on the left side (the left side when facing the front side of the vehicle) of the rear end of the vehicle will be described hereinafter as a representative example. 
       FIG.  2    is an exploded perspective view of the vehicular lamp fitting  10 .  FIG.  3    is a cross-sectional view taken along a line A-A in  FIG.  1   .  FIG.  4    is a cross- sectional view taken along a line B-B in  FIG.  1   . 
     As shown in  FIG.  3   , etc., the vehicular lamp fitting  10  includes a lamp housing  20 , an outer lens  30 , lamp units  40 A and  40 B, a radar housing  50 , a radar cover  60 , and a radar unit  70 . 
     In the lamp housing  20  and the radar housing  50  disposed below the lamp housing  20 , an opening  21  of the lamp housing  20  and an opening  51  of the radar housing  50  that are adjacent to each other are connected by a connecting part  80  (see  FIG.  3   ). In this regard, a side surface  22  (a lower surface in  FIG.  3   ) of the lamp housing  20  and a side surface  52  (an upper surface in  FIG.  3   ) of the radar housing  50  are formed in such a manner that the gap between the side surface  22  of the lamp housing  20  and the side surface  52  of the radar housing  50  becomes wider (i.e., the distance therebetween increases) from the front toward the rear (from the left side toward the right side in  FIG.  3   ). Further, the side surface  22  of the lamp housing  20  and the side surface  52  of the radar housing  50  are opposed to each other with a space therebetween S 1  (i.e., with a space S 1  interposed therebetween). Note that the side surface  22  of the lamp housing  20  and the side surface  52  of the radar housing  50  are formed in such a manner that the gap between them becomes wider toward the rear, so that the lamp housing  20  and the radar housing  50  are disposed as close as possible in the front (on the left side in  FIG.  3   ) and the up/down width of the space Si becomes as large as possible in the rear (on the right side in  FIG.  3   ). However, in the case where the amount of heat in the lamp housing  20  is small, the side surface  22  of the lamp housing  20  and the side surface  52  of the radar housing  50  may be formed so that they are parallel to each other (roughly parallel to each other), or so that the gap (i.e., the distance) between them becomes narrower toward the rear. 
     The lamp housing  20 , the radar housing  50 , and the connecting part  80  are molded as an integrated component by injection-molding them from a synthetic resin such as acrylic and polycarbonate. 
     The outer lens  30  is made of a material transparent to light (visible light) emitted by the lamp units  40 A and  40 B, and, for example, made of a transparent resin (a synthetic resin) such as acrylic and polycarbonate. For example, the outer lens  30  is made of a red transparent resin. Note that the outer lens  30  may be made of a transparent resin having a color other than red. The outer lens  30  is attached to the lamp housing  20  in a state in which it covers the opening  21  of the lamp housing  20 , and forms a space S 2  (an example of the first space in the present disclosure) between the outer lens  30  and the lamp housing  20 . The outer lens  30  is welded to the lamp housing  20  (to the peripheral edge of the opening and to the connecting part  80 ) along its whole peripheral edge. Note that the outer lens  30  may have an arbitrary shape as desired according to the design of the vehicle or the like. 
     The lamp units  40 A and  40 B are disposed in the space S 2  formed by the outer lens  30  and the lamp housing  20  (see  FIG.  3   ). 
     The lamp unit  40 A is, for example, a lamp unit for a stop lamp, and includes a reflector  41 A (a reflective surface) for the stop lamp and a light source for the stop lamp (illustration thereof is omitted in  FIG.  3   ). When the light source for the stop lamp is turned on, light emitted from the light source for the stop lamp is reflected by the reflector  41 A (the reflective surface) for the stop lamp, passes through the outer lens  30 , and is emitted to the outside. In this way, the stop lamp is implemented. 
     The lamp unit  40 B is, for example, a lamp unit for a turn lamp (e.g., a blinker), and includes a reflector  41 B (a reflective surface) for the turn lamp and a light source for the turn lamp (illustration thereof is omitted in  FIG.  3   ). When the light source for the turn lamp is turned on, light emitted from the light source for the turn lamp is reflected by the reflector  41 B (the reflective surface) for the turn lamp, passes through the outer lens  30 , and is emitted to the outside. In this way, the turn lamp is implemented. 
     The radar cover  60  is made of a material opaque to visible light, such as a black synthetic resin. Note that the color of the radar cover  60  is not limited to black. That is, the radar cover  60  may have any color as long as it is opaque to visible light. The radar cover  50  is provided to protect the radar unit  70  from stepping stones or the like and to improve the appearance. The radar cover  60  is attached to the radar housing  50  in a state in which it covers the opening  51  of the radar housing  50 , and forms a space S 3  (an example of the second space in the present disclosure) between the radar cover  60  and the radar housing  50 . Note that it is sufficient if the radar cover  60  is large enough to cover the area through which electromagnetic waves transmitted from the radar unit  70  (millimeter waves having the angle of divergence Ov in the vertical direction (hereinafter also referred to as the vertical divergence angle Ov) (see  FIG.  3   ) and the angle of divergence OH in the horizontal direction (hereinafter also referred to as the horizontal divergence angle OH) (see  FIG.  3   )) pass through, and may have an arbitrary shape as desired according to the design of the vehicle or the like as long as it satisfies the aforementioned condition. 
     The radar unit  70  (the radar apparatus) is disposed in the space S 3  (an example of the second space in the present disclosure) formed by the radar cover  60  and the radar housing  50  (see  FIG.  3   ). The radar unit  70  includes a case  71 , a transmitting antenna and a receiving antenna (both of which are not shown) housed in the case  71 , and so on. The radar unit  70  is a millimeter-wave radar unit that transmits electromagnetic waves (millimeter waves) from the transmitting antenna. The electromagnetic waves (the millimeter waves) pass through the radar cover  60  and are transmitted to a range having a vertical divergence angle θ v  (see  FIG.  3   ) and a horizontal divergence angle θ H  (see  FIG.  3   ). Further, the radar unit  70  receives, by the receiving antenna, reflected waves which have been reflected by an object present in the aforementioned transmission range and have passed through the radar cover  60 . The received signal is processed by a control apparatus such as an ECU (Electronic Control Unit) (not shown), so that the object (e.g., a distance, an angle, and a velocity of the object) is detected. In the radar unit  70 , for example, millimeter waves in a frequency band of 76 to 81 GHz, in particular, in a frequency band of 79 GHz, are used. However, the frequency band is not limited to these frequency bands. 
     Note that the radar method of the radar unit  70  may be either of a pulse method or a CW (Continuous Wave) method, or may be any other method. Further, the antenna method of the radar unit  70  may be any of a mechanical scanning method, a beam switching method, a phased array method, and a digital forming method, or may be any other method. 
     The radar unit  70  is detachably fixed to the radar housing  50 . Specifically, as shown in  FIG.  2   , the radar unit  70  is detachably fixed to the radar housing  50  as engagement parts  53  (three places in  FIG.  2   ) provided in the radar housing  50  engage with flange parts  72  (three places in  FIG.  2   ) provided in the case  71 . Each of the engagement parts  53  is, for example, a pair of claw parts (hook parts) that sandwiches a respective one of the flange parts  72  provided in the case  71  from both sides thereof, and the engagement parts  53  are disposed at places (three places in  FIG.  2   ) corresponding to those of the flange parts  72  (three places in  FIG.  2   ). The engagement parts  53  (the pairs of claw parts) are an example of the first fixing part in the present disclosure. Note that the radar unit  70  may be detachably fixed to the radar housing  50  by using, instead of using the engagement parts  53 , known fixing means such as screws. 
     The radar cover  60  is detachably fixed to the radar housing  50 . Specifically, as shown in  FIG.  4   , the radar cover  60  is detachably fixed to the radar housing  50  by inserting the end  61  of the radar cover  60  on the outer side in the vehicle-width direction into an opening formed at the end  54  of the radar housing  50  on the outer side in the vehicle-width direction, and fixing a flange part  63  provided at the end  62  of the radar cover  60  on the inner side in the vehicle-width direction to the end of the radar housing  50  on the inner side in the vehicle-width direction by a screw N. The screw N is an example of the second fixing part in the present disclosure. 
     As shown in  FIG.  3   , the end of the outer lens  30  (the lower end in  FIG.  3   ) and the end of the radar cover  60  (the upper end in  FIG.  3   ) are opposed to each other with a space therebetween S 4  (i.e., with a space S 4  interposed therebetween). 
     The end of the outer lens  30  (the lower end in  FIG.  3   ) includes a first extension part  31  extending beyond the connecting part  80  to the radar cover  60  side. 
     Meanwhile, the end of the radar cover  60  (the upper end in  FIG.  3   ) includes a second extension part  64  extending from the end of the radar cover  60  to an area behind the first extension part  31 . The second extension part  64  extends in an arc shape around the connecting part  80  (e.g., the center thereof). By inserting the radar cover  60  (the second extension part  64 ) behind the outer lens  30  (the first extension part  31 ) as described above, it is possible to prevent the housings (the lamp housing  20 , the radar housing  50 , and the like) from being visible through the gap (the space S 4 ) between the outer lens  30  and the radar cover  60 . 
     As shown in  FIG.  3   , the radar cover  60  is disposed above and adjacent to a bumper  110  attached to the vehicle (not shown) across a gap S 5  (i.e., with a gap S 5  interposed therebetween). The end of the radar cover  60  (the lower end in  FIG.  3   ) includes a third extension part  65  extending rearward from the end of the radar cover  60 . The third extension part  65  extends rearward roughly in the horizontal direction. Note that the third extension part  65  may extend in a direction inclined from the horizontal direction (e.g., may extend diagonally upward). 
     The bumper  110  is disposed below and adjacent to the radar cover  60  across the gap S 5  (i.e., with the gap S 5  interposed therebetween). The end of the bumper  110  (the upper end in  FIG.  3   ) includes a fourth extension part  111  extending rearward from the end of the bumper  110 . The fourth extension part  111  extends in a direction inclined from the horizontal direction (e.g., extends diagonally downward). 
     The third and fourth extension parts  65  and  111  are formed in such a manner that they become wider (i.e., the distance therebetween increases) toward the rear. In this way, it is possible to prevent the end of the outer lens  30  (the lower end in  FIG.  3   ) and the end of the radar cover  60  (the upper end in  FIG.  3   ), which are opposed to each other, from interfering with (e.g., colliding against) each other even when the radar housing  50  (and the radar cover  60  and radar unit  70  fixed to the radar housing  50 ) shakes (or sways) around the connecting part  80 . Further, it is possible to prevent the end of the outer lens  30  (the lower end in 
       FIG.  3   ) and the end of the radar cover  60  (the upper end in  FIG.  3   ), which are opposed to each other, from interfering with each other even when the third extension part  65  at the lower end of the radar cover  60  and the fourth extension part  111  at the upper end of the bumper  110  shakes (or sways) around the connecting part  80  when the radar cover  60  is removed from the radar housing  50 . 
     The vehicular lamp fitting  10  having the above-described configuration is mounted on a vehicle by fixing flange parts  23  and  24  (see  FIG.  5 A ) provided in the lamp housing  20  to the vehicle (e.g., the frame of the vehicle body or the bumper) by screws. Note that although it is not shown in the drawings, the radar housing  50  may also include flange parts similar to the flange parts  23  and  24 , and these flange parts may be fixed to the vehicle (e.g., the frame of the vehicle body or the bumper) by screws. 
     As shown in  FIG.  5 B , the fastening parts (the flange parts  23  and  24 , etc.) between the lamp housing  20  and the vehicle (e.g., the frame of the vehicle body or the bumper), which are fixed by screws as described above, and the fastening parts (the flange part  63 , etc.) between the radar housing  50  and the radar cover  60 , which are also fixed by screws as described above, are covered by a bezel  90 . In this way, the appearance is improved.  FIG.  5   a    shows the bezel  90  before it is attached, and  FIG.  5   b    shows the bezel  90  after it is attached. Next, a procedure for replacing the radar unit  70  will be described. 
     Firstly, the bezel  90  is removed. As a result, the screw N (see  FIG.  4   ), which fastens the radar cover  60  to the radar housing  50 , is exposed. Next, this screw N is removed, and the radar cover  60  is removed from the radar housing  50 . As a result, the radar unit  70  is exposed. Next, the radar unit  70  is removed from the radar housing  50  and replaced by another radar unit  70 . When doing so, since the radar unit  70  is detachably fixed to the radar housing  50  by the engagement parts  53 , the radar unit  70  can be easily replaced by another radar unit  70 . 
     Next, a procedure for attaching the radar cover  60  to the radar housing  50  after the radar unit  70  is replaced will be described. 
     After the radar unit  70  is replaced by another radar unit  70  as described above, firstly, the end  61  of the radar cover  60  on the outer side in the vehicle- width direction (see  FIG.  4   ) is inserted into the opening formed at the end  54  of the radar housing  50  on the outer side in the vehicle-width direction. Next, as shown in  FIG.  4   , the flange part  63  provided at the end  62  of the radar cover  60  on the inner side in the vehicle-width direction is brought into tight contact with the flange part  56  provided at the end  55  of the radar housing  50  on the inner side in the vehicle-width direction. As a result, the radar cover  60  is positioned relative to the radar housing  50 . This state is the state in which, as shown in  FIG.  3   , the end of the outer lens  30  (the lower end in  FIG.  3   ) and the end of the radar cover  60  (the upper end in  FIG.  3   ) are opposed to each other with the space S 4  therebetween, and the second extension part  64  provided at the end of the radar cover  60  (the upper end in  FIG.  3   ) is disposed behind the end (the first extension part  31 ) of the radar cover  60 . Next, the flange part  63  provided at the end  62  of the radar cover  60  on the inner side in the vehicle-width direction is fixed to the flange part  56  provided at the end  55  of the radar housing  50  on the inner side in the vehicle- width direction by using the screw N. As a result, the radar cover  60  is detachably fixed to the radar housing  50 . 
     The method for attaching and removing the radar cover  60  will be described in a more detailed manner with reference to  FIG.  7   . 
     Firstly, a method for removing the radar cover  60  from the radar housing  50  will be described. 
     Firstly, after the screw N is removed, the radar cover  60  is shifted, relative to the radar housing  50 , to the inner side in the vehicle-width direction (to the right side in  FIG.  4   ). By doing so, the end  61  of the radar cover  60  on the outer side in the vehicle-width direction is pulled out from the opening formed at the end  54  of the radar housing  50  on the outer side in the vehicle-width direction. 
     Next, the radar cover  60  is moved in a direction indicted by an arrow AR 1  in  FIG.  7 A . By doing so, the second extension part  64  of the radar cover  60  is made to abut against (i.e., brought into contact with) the end of the outer lens  30  (the lower end in  FIG.  7 A ). 
     Next, the radar cover  60  is rotated around the point at which the second extension part  64  of the radar cover  60  abuts against (i.e., is in contact with) the end of the outer lens  30  (the lower end in  FIG.  7 A ) in a direction indicated by an arrow AR 2  in  FIG.  7 B . Through the above-described processes, the radar cover  60  can be removed from the radar housing  50  (see  FIG.  7 C ). When doing so, since the end of the radar cover  60  (the lower end including the third extension part  65  in  FIG.  7 B ) moves on a trajectory Ob indicated by a dashed line in  FIG.  7 B , the end of the radar cover  60  (the lower end including the third extension part  65  in  FIG.  7 B ) does not interfere with (e.g., does not collide against) the bumper  110  (the fourth extension part  111 ). Further, since the second extension part  64  extends in an arc shape around the connecting part  80  (e.g., the center thereof), the state in which the second extension part  64  of the radar cover  60  abuts against (i.e., is in contact with) the end of the outer lens  30  (the lower end in  FIG.  7 B ) can be maintained while the radar cover  60  is being rotated in the direction indicted by the arrow AR 2  in  FIG.  7 B  as described above. Next, a method for attaching the radar cover  60  to the radar housing  50  will be described. The radar cover  60  can be attached to the radar housing  50  by following (i.e., performing) the above-described procedure of the method for removing the radar cover  60  from the radar housing  50  in a reversed manner. That is, firstly, the second extension part  64  of the radar cover  60  is made to abut against (i.e., is brought into contact with) the end of the outer lens  30  (the lower end in  FIG.  7 B ). 
     Next, the radar cover  60  is rotated around the point at which the second extension part  64  of the radar cover  60  abuts against (i.e., is in contact with) the end of the outer lens  30  (the lower end in  FIG.  7 B ) in a direction opposite to the direction indicated by the arrow AR 2  in  FIG.  7 B . When doing so, since the end of the radar cover  60  (the lower end including the third extension part  65  in  FIG.  7 B ) moves on the trajectory Ob indicated by the dashed line in  FIG.  7 B , the end of the radar cover  60  (the lower end including the third extension part  65  in  FIG.  7 B ) does not interfere with the bumper  110  (the fourth extension part  111 ). Further, since the second extension part  64  extends in an arc shape around the connecting part  80  (e.g., the center thereof), the state in which the second extension part  64  of the radar cover  60  abuts against (i.e., is in contact with) the end of the outer lens  30  (the lower end in  FIG.  7 B ) can be maintained while the radar cover  60  is being rotated in the direction opposite to the direction indicted by the arrow AR 2  in  FIG.  7 B  as described above. 
     Next, the radar cover  60  is shifted, relative to the radar housing  50 , to the outer side in the vehicle-width direction (to the left side in  FIG.  4   ). By doing so, the end  61  of the radar cover  60  on the outer side in the vehicle-width direction is inserted into the opening formed at the end  54  of the radar housing  50  on the outer side in the vehicle-width direction. Next, the flange part  63  provided at the end  62  of the radar cover  60  on the inner side in the vehicle-width direction is fixed to the end of the radar housing  50  on the inner side in the vehicle-width direction by using the screw N. Through the above-described processes, the radar cover  60  can be attached to the radar housing  50 . As described above, according to this embodiment, it is possible to prevent the distance between the radar unit  70  and the radar cover  60  from changing (and as a result, to prevent noises from occurring in electromagnetic waves (radar signals) that pass through the radar cover  60  and are transmitted to an area around the vehicle). In this way, it is possible to prevent the accuracy of the detection of an object present around the vehicle from deteriorating. 
     This is because the radar unit  70  and the radar cover  60  are fixed to one and the same radar housing  50 . That is, this is because since the radar unit  70  and the radar cover  60  are fixed to the same radar housing  50 , the radar unit  70  and the radar cover  60  vibrate in a unified manner (e.g., simultaneously vibrate in the same directions in the same manner as each other) when they vibrate due to vibrations of the vehicle (not shown) on which the vehicular lamp fitting  10  is mounted (e.g., due to vibrations thereof during the traveling), so that the distance between the radar unit  70  and the radar cover  60  does not change. 
     Further, according to this embodiment, there is another advantage that the effect of the heat (the heat generated by the lamp units  40 A and  40 B) on the radar unit  70  can be reduced. This is because the radar unit  70  is disposed in the second space S 3  (formed by the radar housing  50  and the radar cover  60 ) in which the temperature is lower than that in the first space S 2  (formed by the lamp housing  20  and the outer lens  30 ) where the temperature is raised due to the heat generated by the lamp units  40 A and  40 B. Further, according to this embodiment, since the side surface of the lamp housing  20  (the lower surface in  FIG.  3   ) and the side surface of the radar housing  50  (the upper surface in  FIG.  3   ) are opposed to each other with the space S 1  therebetween, the heat in the lamp housing  20  is less likely to be transmitted to the radar unit  70 , thus making it possible to further reduce the effect of the heat (the heat generated by the lamp units  40 A and  40 B) on the radar unit  70 . 
     Further, according to this embodiment, there is another advantage that the radar unit  70  can be easily repaired or replaced in the event of failure thereof. This is because each of the radar unit  70  and the radar cover  60  is detachably fixed to the radar housing  50 , so that the radar unit  70  can be replaced by removing the radar cover  60  from the radar housing  50  without removing the vehicular lamp fitting  10  itself from the vehicle (not shown). 
     Further, according to this embodiment, since the lamp housing  20 , the radar housing  50 , and the connecting part  80  are formed as an integrated component by injection molding, the radar housing  50  can be accurately positioned relative to the lamp housing  20  as compared to the case where the lamp housing  20  and the radar housing  50  are separately molded and then assembled into one assembly. Therefore, it is possible to reduce variations among the detection areas of radar units  70 . 
     Further, according to this embodiment, since a bracket  100  (which will be described later) is not used, the number of components interposed between the vehicle and the radar unit  70  is reduced. Therefore, there are other advantages that the accuracy of the assembly is improved and the cost is reduced as compared to a modified example in which a bracket  100  is used (which will be described later). Next, a modified example will be described. 
       FIG.  6    shows a modified example of the vehicular lamp fitting  10 . The vehicular lamp fitting  10  according to this modified example corresponds to one that is obtained by adding a bracket  100  in the vehicular lamp fitting  10  shown in  FIG.  3   . The rest of the configuration is similar to that of the vehicular lamp fitting  10  shown in  FIG.  3   . 
     Although an example in which the radar unit  70  is fixed to the radar housing  50  by the engagement parts  53  provided in the radar housing  50  is described in the above-described embodiment, the present disclosure is not limited to this example. 
     For example, as shown in  FIG.  6   , the radar unit  70  may be fixed to the radar housing  50  by using an engagement part(s)  53  provided in the bracket  100  fixed to the radar housing  50 . 
     According to this modified example, radar units having various shapes can be fixed to the radar housing  50  by replacing the bracket  100  by other brackets without changing the radar housing  50 . Further, even in the case where the engagement part(s)  53  cannot be provided in the radar housing  50  because of the mold (i.e., dies) or the like, the radar unit  70  can be fixed to the radar housing  50  through the bracket  100 . 
     Further, although an example in which the lamp housing  20  and the radar housing  50  are molded as an integrated component is described in the above- described embodiment, the present disclosure is not limited to this example. For example, the lamp housing  20  and the radar housing  50  may be separately molded, and then they may be assembled into one assembly. 
     Further, an example in which the radar housing  50  is disposed below the lamp housing  20  is described in the above-described embodiment, the present disclosure is not limited to this example. That is, the radar housing  50  may be disposed in various places such as above the lamp housing  20  or on the right or left side thereof. 
     Further, although an example in which a vehicular lamp fitting according to the present disclosure is applied to a rear combination lamp has been described in the above-described embodiment, the present disclosure is not limited to this example. For example, the present disclosure may be applied to a vehicle signal lighting fixture other than the rear combination lamp, and may also be applied to other vehicular lamp fittings such as a vehicle front light (e.g., a headlight). All the numeral values mentioned in the above-described embodiments are merely examples, and numeral values different from them can be uses as appropriate. 
     The above-described embodiments are merely examples in all the aspects thereof. The present disclosure should not be limited by the descriptions of the above-described embodiments. The present disclosure may be carried out in various other forms without departing from the spirit or main features of the disclosure. 
     From the disclosure thus described, it will be obvious that the embodiments of the disclosure may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the disclosure, and all such modifications as would be obvious to one skilled in the art are intended for inccclusion within the scope of the following claims.