JP2006269340A - Headlamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein with a conventional head lamp only two light distribution patterns could be obtained. <P>SOLUTION: The head lamp is equipped with a first shade 5 and a second shade 6 switching reflection light, traveling toward a projection lens 4 from a reflector 3 to a low beam capable of obtaining a light distribution pattern LP for passing by; a mid-beam capable of obtaining a light distribution pattern MP for a highway and a high beam, capable of obtaining a light distribution pattern HP for running; and a switching device 7 switching the first shade 5 and the second shade 6 to a low-beam attitude capable of obtaining a low beam, a mid-beam attitude capable of obtaining a mid-beam, and a high-beam posture capable of obtaining a high beam. As a result, three light distribution patterns LP, MP, and HP are obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a two-lamp headlamp, which relates to a projector-type headlamp that can obtain a light distribution pattern for passing, a light distribution pattern for an expressway, and a light distribution pattern for traveling.

  This type of headlamp is conventional (see, for example, Patent Document 1). Hereinafter, the headlamp will be described. This headlamp has one light source (2), a reflector (3) that reflects light from the one light source (2), and a light collection that irradiates the reflected light from the reflector (3) forward. A lens (4), a movable shade (5) for switching the irradiation light from the condenser lens (4) between a low beam and a high beam, and a switching device for switching the movable shade (5) between a low beam posture and a high beam posture. A solenoid (6) and a spring member (7).

  Next, the operation of the two-lamp headlamp will be described. Turn on the light source (2). Then, the light from the light source (2) is reflected by the reflector (3). The reflected light is irradiated forward through the condenser lens (4). Then, the movable shade (5) is switched between the low beam posture and the high beam posture by the operation of the solenoid (6) and the spring member (7) as a switching device. Then, the irradiation light is switched to a low beam or a high beam. As a result, a predetermined light distribution pattern for passing by the low beam or a predetermined light distribution pattern for traveling by the high beam can be obtained. However, the above-described headlamp has a problem that only two light distribution patterns, that is, a predetermined light distribution pattern for passing and a predetermined light distribution pattern for traveling can be obtained.

JP 2003-59311 A

  The problem to be solved by the present invention is that the conventional headlamp can obtain only two light distribution patterns.

  According to the present invention (the invention according to claim 1), the reflected light traveling from the reflector to the projection lens is divided into a low beam for obtaining a light distribution pattern for passing and a mid beam for obtaining a light distribution pattern for highways and a distribution for traveling. The first shade and the second shade to be switched to a high beam from which an optical pattern is obtained, and the first shade and the second shade, a low beam posture from which a low beam is obtained, a mid beam posture from which a mid beam is obtained, and a high beam posture from which a high beam is obtained. And a switching device for switching.

  In the present invention (the invention according to claim 1), the switching device includes a drive motor and a first advance / retreat rod and a second advance / retreat rod that advance and retreat in the same direction. The first shade and the second shade are in the low beam posture when both the second advance / retreat rod are located at the initial position, and the first shade and the second shade are obtained when the first advance / retreat rod advances and reaches the advance position from the initial position. The shade is switched to a mid-beam posture, and the first shade and the second shade are switched to a high-beam posture when the second forward / backward rod moves forward and reaches an advanced position from an initial position.

  According to the present invention (the invention according to claim 2), the idle mechanism in which the first advancing / retracting rod stops at the advance position after the first advancing / retreating rod reaches the advance position until the second advance / retreat rod reaches the advance position is the first idle mechanism. It is provided in the advance / retreat rod.

  In the present invention (the invention according to claim 3), the first shade is provided with a first movable portion that switches the first shade to the mid-beam posture by contact and advance of the first advance / retreat rod. Is provided with a second movable portion that switches the second shade to a high beam posture by contact and advancement of the second advance / retreat rod. When the first shade and the second shade are in the low beam posture, the first movable portion and the second movable portion are provided. And the distance between the initial position of the first forward / backward rod and the first movable part is smaller than the distance between the initial position of the second forward / backward rod and the second movable part. It is characterized by.

  The headlamp of this invention (the invention according to claim 1) is used for passing because the reflected light from the reflector toward the projection lens is switched to the low beam when the first shade and the second shade are switched to the low beam posture by the switching device. The light distribution pattern is obtained. Similarly, when the first shade and the second shade are switched to the mid beam posture by the switching device, the reflected light from the reflector toward the projection lens is switched to the mid beam, so that a light distribution pattern for an expressway is obtained. Furthermore, similarly, when the first shade and the second shade are switched to the high beam posture by the switching device, the reflected light from the reflector toward the projection lens is switched to the high beam, so that a light distribution pattern for traveling can be obtained. As described above, the headlamp according to the present invention (the invention according to claim 1) can obtain three light distribution patterns, that is, a light distribution pattern for passing, a light distribution pattern for highways, and a light distribution pattern for traveling. .

  Further, the headlamp of the present invention (the invention according to claim 1) uses a drive motor as a drive source of the switching device. Therefore, the headlamp is superior in durability because it generates less heat than the solenoid. Moreover, in the headlamp of the present invention (the invention according to claim 1), the first advancing / retreating rod and the second advancing / retreating rod advance / retreat between the initial position and the advancing position by the driving force of the drive motor, so Since the two shades are switched, the noise is small compared to the technology of switching the posture of the shade by switching the plunger with an electromagnet or a spring of the solenoid, so that the comfort in the vehicle (automobile) is good.

  In the headlamp of the present invention (the invention according to claim 2), the second lamp after the first advancing / retracting rod reaches the forward movement position and the first shade and the second shade are switched to the mid beam posture by the idle mechanism. The first advancing / retreating rod is in an idle state until the advancing / retreating rod reaches the forward movement position and the first shade and the second shade are switched to the high beam posture. For this reason, the headlamp of the present invention (the invention according to claim 2) is the first lamp by the switching of the first shade and the second shade to the mid beam posture by the advance of the first advance / retreat rod and the advance of the second advance / retreat rod. Since the switching of the first shade and the second shade to the high beam posture can be made independent, the forward movement of the first forward / backward rod and the forward movement of the second forward / backward rod affect the switching of the posture of the first shade and the second shade. The light distribution pattern can be switched reliably and accurately without giving.

  In the headlamp of this invention (the invention according to claim 3), the distance between the initial position of the first advance / retreat rod and the first movable part is larger than the distance between the initial position of the second advance / retreat rod and the second movable part. When the first forward / backward rod and the second forward / backward rod advance at the same speed, the first forward / backward rod first contacts the first movable portion to reach the forward position, and the first shade is switched to the mid beam posture. Then, the second advancing / retreating rod is brought into contact with the second movable portion to reach the forward movement position, and the second shade is switched to the high beam posture. To this end, the headlamp of the present invention (the invention according to claim 3) is configured to switch the first shade to the mid-beam posture by the advancement of the first advance / retreat rod and the high beam of the second shade by the advancement of the second advance / retreat rod. Since the switching to the posture can be made independent, the advancement of the first advance / retreat rod and the advancement of the second advance / retreat rod may affect the change of the posture of the first shade and the change of the posture of the second shade. Therefore, the light distribution pattern can be switched reliably and accurately. In addition, the headlamp of the present invention (the invention according to claim 3) is configured such that the first advance / retract rod and the second advance / retract rod are made the same by simply shifting the initial position of the first advance / retract rod and the initial position of the second advance / retract rod. Since it can be advanced at a speed, the structure of the driving force transmission mechanism of the switching device can be simplified, and the manufacturing cost can be reduced accordingly.

  Hereinafter, two examples of embodiments of the headlamp according to the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments. In the drawings, the symbol “F” indicates the front side of the vehicle (the forward direction side of the vehicle). The symbol “B” indicates the rear side of the vehicle. Reference sign “U” indicates an upper side of the front side as viewed from the driver side. The symbol “D” indicates the lower side when the front side is viewed from the driver side. The symbol “L” indicates the left side when the front side is viewed from the driver side. The symbol “R” indicates the right side when the front side is viewed from the driver side. The symbol “VU-VD” indicates vertical lines on the top and bottom of the screen. The symbol “HL-HR” indicates the left and right horizontal lines and the left and right horizontal lines of the screen.

  1 to 12 show Embodiment 1 of a headlamp according to the present invention. Hereinafter, the configuration of the headlamp according to the first embodiment will be described. In FIG. 1, reference numeral 1 denotes a headlamp according to the first embodiment. The headlamp 1 is, for example, a projector type headlamp. As shown in FIG. 1, the headlamp 1 includes a discharge lamp 2 as a light source, a reflector 3, a projection lens (condensing lens) 4, a first shade 5 and a second shade 6, and a switching device 7. Is provided.

  The discharge lamp 2 is a so-called high pressure metal vapor discharge lamp such as a metal halide lamp, a high intensity discharge lamp (HID), or the like. The discharge lamp 2 is detachably attached to the reflector 3 via a socket mechanism 8. The light emitting portion of the discharge lamp 2 is located at or near the first focal point F1 of the reflector 3. In addition to the discharge lamp 3, the light source may be a halogen bulb or an incandescent bulb.

  A reflective surface is formed on the inner concave surface of the reflector 3 by vapor deposition of aluminum or silver coating. The reflecting surface of the reflector 3 is a reflecting surface based on an ellipse, such as a rotating ellipsoid or a free-form surface (NURBS surface) based on an ellipse (the vertical cross section in FIG. , A horizontal cross section (not shown) is a parabolic surface or a reflective surface having a deformed parabolic surface). For this purpose, the reflecting surface of the reflector 3 has a first focal point F1 and a second focal point (focal line on the horizontal section) F2. The reflector 3 is fixedly held by a holder (frame) 9. The free curved surface (NURBS curved surface) of the reflecting surface of the reflector 3 is a NURBS free curved surface (Non-Uniform Rational B-B) described in “Mathematical Elemennts for Computer Graphics” (Devid F. Rogers, J Alan Adams). Spline Surface).

  The projection lens 4 is an aspherical convex lens. The front side of the projection lens 4 forms a convex aspheric surface, while the rear side of the projection lens 4 forms a flat aspheric surface. The projection lens 4 is fixedly held by the holder 9. Although not shown, the projection lens 4 has a focal plane (meridional image plane) on the object space side in front of the second focal point F2 of the reflecting surface of the reflector 3.

  The first shade 5 and the second shade 6 use a low beam (from which a predetermined light distribution pattern LP shown in FIG. 10C is obtained as reflected light directed from the reflecting surface of the reflector 3 toward the projection lens 4 (FIG. 10C). (Passing beam), a mid beam (highway beam) from which a predetermined highway light distribution pattern MP shown in FIG. 11C is obtained, and a predetermined light distribution pattern HP for driving shown in FIG. Is switched to a high beam (running beam).

  On the other hand, the switching device 7 moves the first shade 5 and the second shade 6 into a low beam posture (the posture for passing, the posture shown in FIGS. 10A and 10B) from which the low beam is obtained. The mid-beam posture (the posture for an expressway and the posture shown in FIGS. 11A and 11B) from which the mid-beam is obtained, and the high-beam posture (the running posture) from which the high beam is obtained, 12 (A) and (the posture shown in (B)).

  As shown in FIGS. 4 and 6, the first shade 5 includes a front shade portion 50 </ b> F and a rear shade portion 50 </ b> B, a first movable portion 51, and two first support portions 52. .

  The front shade portion 50F and the rear shade portion 50B are made of a substantially rectangular thin plate member that is long in the lateral direction (left-right direction, horizontal direction). A lower part of the front shade part 50F and a lower part of the rear shade part 50B are connected by a horizontal plate. As a result, a gap is formed between the front shade portion 50F and the rear shade portion 50B. An upper horizontal cutoff line CL1L, an oblique cutoff line CL2L, and a lower horizontal cutoff line CL3L for the passing light distribution pattern LP are formed on the upper edge of the front shade part 50F and the upper edge of the rear shade part 50B. A lower horizontal edge 541, an oblique edge 542, and an upper horizontal edge 543 are provided. A notch 50 is provided on the left half of the lower portion of the front shade portion 50F.

  The first movable part 51 is composed of a rectangular thin plate member. One end (rear end) of the first movable portion 51 is fixed to the lower right side of the front shade portion 50F, and the first movable portion 51 protrudes forward from the front shade portion 50F. The plate surfaces of the front shade portion 50F and the rear shade portion 50B are substantially vertical, while the plate surface of the first movable portion 51 is substantially horizontal.

  The two first support portions 52 are integrally provided at substantially the center of both the left and right sides of the upper surface of the first movable portion 51. The two first support portions 52 are provided with circular through holes.

  Similarly, as shown in FIGS. 4 and 6, the second shade 6 includes a shade portion 60, a second movable portion 61, and two second support portions 62.

  The shade portion 60 is formed of a substantially rectangular thin plate member that is long in the lateral direction (left-right direction, horizontal direction). The shade portion 60 is disposed in a gap between the front shade portion 50F and the rear shade portion 50B of the first shade 5. A lower horizontal edge 641 and an oblique edge 642 for forming an upper horizontal cut-off line CL1M, an oblique cut-off line CL2M, and a lower horizontal cut-off line CL3M on the expressway light distribution pattern MP are formed on the upper edge of the shade part 60. An upper horizontal edge 643 is provided.

  The second movable portion 61 is composed of a rectangular thin plate member. One end (rear end) of the second movable portion 51 is fixed to the lower left side of the shade portion 60 through the notch 50 of the first shade 5, and the second movable portion 61 is located on the front side from the shade portion 60. Protruding. The plate surface of the shade part 60 is substantially vertical, while the plate surface of the second movable part 61 is substantially horizontal.

  The two second support parts 62 are integrally provided at substantially the center of both the left and right sides of the upper surface of the second movable part 61. The two second support portions 62 are provided with circular through holes.

  The first shade 5 and the second shade 6 are attached to the holder 9 via a rotating shaft 10 and a frame 11 so that their postures can be switched. As shown in FIGS. 6 to 9, the frame 11 includes two fixing portions 12 at both left and right ends, two restricting portions 13 and two stopper portions 14 in the middle between the left and right sides, and a center pressing portion 15. It is composed of Both ends of the rotating shaft 10 are fixed to the two fixing portions 12, respectively, and the rotating shaft 10 is arranged in the left-right direction (horizontal direction). The first shade 5 and the second shade 6 are disposed between the two restricting portions 13. The left and right ends of the front shade portion 50F and the rear shade portion 50B of the first shade 5 and the shade portion 60 of the second shade 6 are opposed to the lower surfaces of the two stopper portions 14. A first support portion 52 of the first shade 5 and a second support portion 62 of the second shade 6 are rotatably supported on the rotary shaft 10. As a result, the first shade 5 and the second shade 6 are attached to the holder 9 via the rotating shaft 10 and the frame 11 so that the posture can be switched. Further, the edges 641, 642, 643 of the upper edge of the shade portion 60 of the second shade 6 are positioned at or near the second focal point F2 of the reflecting surface of the reflector 3.

  A spring 16 is provided between the first shade 5 and the second shade 6 and the rotary shaft 10. As shown in FIGS. 4 to 6, the spring 16 includes a central fixing portion 17, two coil portions 18 in the middle of the left and right, and two urging portions 19 at both left and right ends. The rotating shaft 10 is inserted through the two coil portions 18. The fixing portion 17 is fixed to the presser portion 15 of the frame 11. The two urging portions 19 include a portion of the upper surface of the first movable portion 51 of the first shade 5 that is in front of the first support portion 52 and the second movable portion of the second shade 6. Each of the upper surfaces of 61 is in elastic contact with the front side of the second support part 62. The two coil portions 18 are in elastic contact with the first support portion 52 of the first shade 5 and the second support portion 62 of the second shade 6 that face each other.

  The first shade 5 and the second shade 6 are caused by the spring force P1 acting outward in the left-right direction of the two coil portions 18 and the right-left restricting action of the two restricting portions 13. Movement in the left-right direction is restricted. Further, the first shade in the low beam posture is obtained by the spring force P2 acting around the rotation shaft 10 of the two urging portions 19 and the stopper action around the rotation shaft 10 of the two stopper portions 14. 5 and the rotation of the second shade 6 around the rotation axis 10 are restricted. As a result, the first shade 5 and the second shade 6 are supported without play in the left-right direction and around the rotation shaft 10. When the first shade 5 and the second shade 6 are in the low beam posture, the first movable portion 51 of the first shade 5 and the second movable portion of the second shade 6 are shown in FIG. 61 is located at substantially the same level (same height).

  2 and 3, the switching device 7 has a unit structure, and includes a housing 20, a drive motor 21, a first advance / retreat rod 22, a second advance / retreat rod 23, and a drive force transmission mechanism 24. And an idle mechanism 26.

  The housing 20 is fixed to the frame 11 so as to face the lower surface of the first movable portion 51 of the first shade 5 and the lower surface of the second movable portion 61 of the second shade 6. As a result, the switching device 7 is attached to the holder 9 via the frame 11. The housing 20 includes one drive motor 21 as a drive source. For example, a stepping motor, a DC motor, a brushless motor, or the like is used as the drive motor 21. The drive motor 21 is provided with a drive shaft 25. The drive shaft 25 may be rotatably supported on the housing 20 by a bearing (not shown) or the like.

  The housing 20 is provided with the first advance / retreat rod 22 and the second advance / retreat rod 23 through the idle mechanism 26 and the second feed screw mechanism 27, respectively. The first advance / retreat rod 22 and the second advance / retreat rod 23 may be supported by the housing 20 so as to be rotatable and axially movable by a bearing (not shown) or the like. The axial direction (advance / retreat direction) of the first advance / retreat rod 22 and the second advance / retreat rod 23 and the axial direction of the drive shaft 25 are substantially parallel to each other. The tip of the first advancing / retracting rod 22 has a substantially hemispherical shape, and is opposed to a portion of the lower surface of the first movable portion 51 of the first shade 5 that is in front of the first support portion 52. . On the other hand, the tip of the second advancing / retracting rod 23 has a substantially hemispherical shape, and is located on the upper surface of the second movable portion 61 of the second shade 6 in front of the second support portion 62. Opposite to.

  When the first shade 5 and the second shade 6 are in the low beam posture, as shown in FIG. 2A and FIG. 7, the first advance / retreat rod 22 and the second advance / retreat rod 23 are respectively in the initial position S1 and Located in S2. The initial position S1 of the first advance / retreat rod 22 is located above the initial position S2 of the second advance / retreat rod 23. When the first advance / retreat rod 22 is located at the initial position S <b> 1, the tip of the first advance / retreat rod 22 is in contact with the lower surface of the first movable portion 51 of the first shade 5. On the other hand, when the second advance / retreat rod 23 is located at the initial position S <b> 2, the tip of the second advance / retreat rod 23 is located below the lower surface of the second movable portion 61 of the second shade 6. That is, the distance between the initial position S1 of the first advance / retreat rod 22 and the first movable part 51 is substantially 0, and the initial position S2 of the second advance / retreat rod 23 and the second movable part It is smaller than the distance to 61.

  As shown in FIGS. 2A and 2B, the idle mechanism 26 includes a nut member 28 (female screw in a screw hole) accommodated in the housing 20 so as to be vertically movable and non-rotatable. The nut member 28 is provided between the nut member 28 and the housing 20 so that the nut member 28 is always attached to the first advancing / retracting rod 22 and the screw portion (pressing screw) screwed into the nut member 28. A compression coil spring 29 that is biased upward and a stopper 33 provided on the housing 20 are configured. On the other hand, the second feed screw mechanism 27 includes a female screw having a screw hole provided in the housing 20 and a male screw provided in the second advance / retreat rod 23. The idle mechanism 26 and the second feed screw mechanism 27 are both composed of screws in the same direction, that is, right-handed screws or left-handed screws. As a result, when the first advance / retreat rod 22 and the second advance / retreat rod 23 rotate in the same direction, the first advance / retreat rod 22 and the second advance / retreat rod 23 advance / retreat in the same direction. To do.

  2A shows that when the first shade 5 and the second shade 6 are in the low beam posture, that is, the first advance / retreat rod 22 and the second advance / retreat rod 23 are at the initial positions S1 and S2, respectively. It is sectional drawing which shows the internal structure of the said switching apparatus 7 when located. FIG. 2B is a cross-sectional view taken along line BB in FIG. As shown in FIG. 2B, since one side of the nut member 28 is in contact with the housing 20, the nut member 28 can move up and down with respect to the housing 20 and cannot rotate. .

  The driving force transmission mechanism 24 advances and retracts the first advance / retreat rod 22 and the second advance / retreat rod 23 in the same direction. The drive force transmission mechanism 24 is attached to the drive gear 32 attached to the drive shaft 25, the first driven gear 30 attached to the first advance / retreat rod 22, and the second advance / retreat rod 23. The second driven gear 31 is provided. The drive gear 32, the first driven gear 30, and the second driven gear 31 are formed of spur gears. The drive gear 32 is engaged with the first driven gear 30 and the second driven gear 31. As a result, when the drive shaft 25 rotates in one direction, the first advance / retreat rod 22 moves forward via the drive gear 32 and the first driven gear 30, and the second advance / retreat rod 23 It advances in the same direction and at the same speed via the drive gear 32 and the second driven gear 31. When the drive shaft 25 rotates in the opposite direction, the first advance / retreat rod 22 moves backward via the drive gear 32 and the first driven gear 30, and the second advance / retreat rod 23 moves the drive Retreat in the same direction and at the same speed via the gear 32 and the second driven gear 31. The first driven gear 30 and the second driven gear 31 advance and retreat as the first advance / retreat rod 22 and the second advance / retreat rod 23 advance and retreat. The stopper 33 and the first driven gear 30 are opposed to each other with a gap. The distance of the gap between the stopper 33 and the first driven gear 30 is substantially equal to the distance from the initial position S1 of the first advance / retreat rod 22 to the advance position A1.

  The headlamp 1 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  First, the discharge lamp 2 is turned on. Then, the light from the discharge lamp 2 is reflected by the reflecting surface of the reflector 3. The reflected light is collected at the second focal point F2 of the reflecting surface of the reflector 3, diffused through the second focal point F2, and further projected forward (radiated and irradiated) through the projection lens 4. . The projection light (radiated light, irradiated light) is distributed as a low beam from which a predetermined light distribution pattern LP shown in FIG. 10C is obtained or a predetermined motorway distribution shown in FIG. 11C. It is projected forward as a mid beam from which the light pattern MP is obtained or as a high beam from which a predetermined traveling light distribution pattern HP shown in FIG. 12C is obtained.

  Here, a case where a light distribution pattern LP for passing is obtained will be described. The positions of the first advance / retreat rod 22 and the second advance / retreat rod 23 of the switching device 7 are positioned at the initial positions S1 and S2, respectively (see FIG. 2A and FIG. 7). The tip of the first advancing / retracting rod 22 located at the initial position S1 is located above the tip of the second advancing / retreating rod 23 located at the initial position S2, and the first movable part 51 of the first shade 5 is the first movable part 51. 1 is in contact with the lower surface of the portion in front of the support portion 52.

  At this time, the first shade 5 and the second shade 6 are located at the first position (the positions shown in FIGS. 7 and 10A and 10B), respectively, and the light distribution pattern LP (low beam) for passing. ). That is, a portion of the first movable portion 51 of the first shade 5 on the front side of the first support portion 52 and a portion of the second movable portion 61 of the second shade 6 on the front side of the second support portion 62 are These are biased downward by the biasing portion 19 of the spring 16. On the other hand, of the first movable portion 51 of the first shade 5, the rear portion of the first support portion 52, particularly the front shade portion 50 F and the rear shade portion 50 B, and the second movable portion 61 of the second shade 6. Of these, the rear portion of the second support portion 62, particularly the shade portion 60, is urged upward by the urging portion 19 of the spring 16 and abuts against the left and right stopper portions 14 of the frame 11. Yes. Thereby, the 1st shade 5 and the 2nd shade 6 hold | maintain a low beam attitude | position. Moreover, the first shade 5 and the second shade 6 are caused by the spring force P1 of the coil portion 18 and the restriction action of the restriction portion 13, and by the spring force P2 of the biasing portion 19 and the stopper action of the stopper portion 14. It is supported without play in the left-right direction and around the rotation shaft 10.

  When the first shade 5 and the second shade 6 are in the low beam posture, as shown in FIGS. 10A and 10B, the edges 541, 542 of the front shade portion 50F of the first shade 5 and the rear shade portion 50B, 543 is positioned slightly above the edges 641, 642, 643 of the shade portion 60 of the second shade 6. For this reason, as shown in FIG. 10C, a passing light distribution pattern LP having cut-off lines CL1L, CL2L, and CL3L is obtained.

  That is, of the reflected light, the reflected light that travels to substantially the upper half of the condenser lens 4 is blocked by the front shade portion 50F and the rear shade portion 50B of the first shade 5, while The reflected light traveling to the lower half is irradiated forward as a low beam. For this reason, as shown in FIG. 10C, a predetermined light distribution pattern LP for passing is obtained. In this predetermined light distribution pattern LP for passing, the upper horizontal cutoff line CL1L on the traveling lane side (left side) is positioned slightly above the left and right horizontal line HL-HR, and the lower horizontal cutoff line CL3L on the opposite diagonal line side (right side). Is located below the left and right horizontal line HL-HR, and the oblique cut-off line CL2L is located between the upper horizontal cut-off line CL1L and the lower horizontal cut-off line CL3L, so that it is possible to illuminate the road on the traveling lane side to a far distance. It is possible to illuminate the front side mainly on the road on the opposite lane side. Thereby, this predetermined light distribution pattern LP for passing is an optimal light distribution pattern when the host vehicle passes by an oncoming vehicle.

  Next, a case where the light distribution pattern LP for passing is switched to the light distribution pattern MP for highway will be described. The drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in one direction (forward or reverse). Then, the rotational force in one direction of the drive shaft 25 is applied to the first advance / retreat rod 22 via the drive gear 32 and the first driven gear 30, and to the second advance / retreat rod 23 via the drive gear 32 and the second driven gear 31. , Transmitted as advance / retreat force respectively. As a result, the first advance / retreat rod 22 advances from the initial position S1 shown in FIGS. 2A and 7 to the advance position A1 shown in FIGS. 3A and 8. On the other hand, the second advance / retreat rod 23 extends from the initial position S2 shown in FIGS. 2 (A) and 7 to the position shown in FIGS. 3 (A) and 8 (the same position as the initial position S1 of the first advance / retreat rod 22). Advance. When the first advance / retreat rod 22 advances a predetermined distance (a distance from the initial position S1 shown in FIGS. 2A and 7 to the advance position A1 shown in FIGS. 3A and 8), the switching device 7 The drive motor 21 is stopped.

  When the first advance / retreat rod 22 advances to the advance position A1, as shown in FIG. 11B, the first shade 5 moves around the rotation axis 10 against the spring force P2 of the urging portion 19 of the spring 16. It rotates clockwise and switches from the first position to the second position (the positions shown in FIGS. 8 and 11A and 11B). On the other hand, even if the second advance / retreat rod 23 moves forward to the initial position S1 of the first advance / retreat rod 22, the second shade 6 maintains the first position as shown in FIG. As a result, the first shade 5 and the second shade 6 are switched from the low beam posture to the mid beam posture where the light distribution pattern MP (mid beam) for the highway is obtained. At this time, since the first movable portion 51 of the first shade 5 is sandwiched between the biasing portion 19 of the spring 16 and the first advance / retreat rod 22 of the switching device 7, the first shade 5 has the rotating shaft 10. It is supported without play around.

  When the first shade 5 and the second shade 6 are switched to the mid-beam posture, as shown in FIGS. 11A and 11B, the front shade portion 50F of the first shade 5 and the edge 541 of the rear shade portion 50B, 542 and 543 are located slightly below the edges 641, 642 and 643 of the shade portion 60 of the second shade 6. As a result, as shown in FIG. 11C, a highway light distribution pattern MP having cut-off lines CL1M, CL2M, and CL3M is obtained.

  That is, of the reflected light, the reflected light that travels to substantially the upper half of the condenser lens 4 is blocked by the shade portion 60 of the second shade 6, while the reflected light that travels to substantially the lower half of the condenser lens 4. Is irradiated forward as a mid beam. Therefore, as shown in FIG. 11C, a predetermined highway light distribution pattern MP is obtained. This predetermined highway light distribution pattern MP is located slightly above the cut-off line CL1L, CL2L, CL3L of the light distribution pattern LP for the passing line CL1M, CL2M, CL3M. A road farther than the pattern LP can be illuminated. Moreover, since the lower horizontal cut-off line CL3M is located slightly below the left and right horizontal line HL-HR, glare is not given to the oncoming vehicle. Thus, the predetermined highway light distribution pattern MP is an optimal light distribution pattern when traveling on a highway that travels at a high speed and frequently encounters oncoming vehicles.

  Then, the case where the light distribution pattern MP for highways is switched back to the light distribution pattern LP for passing will be described. The drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in the reverse direction (reverse or forward). Then, the rotational force in the reverse direction of the drive shaft 25 causes the first advance / retreat rod 22 via the drive gear 32 and the first driven gear 30, and the second advance / retreat rod 23 via the drive gear 32 and the second driven gear 31. , Transmitted as advance / retreat force respectively. As a result, the first advance / retreat rod 22 moves backward from the advance position A1 shown in FIGS. 3 (A) and 8 to the initial position S1 shown in FIGS. 2 (A) and 7. On the other hand, the second advancing / retracting rod 23 is moved from the position shown in FIGS. 3A and 8 (substantially the same position as the initial position S1 of the first advancing / retracting rod 22) to the initial position S2 shown in FIGS. fall back. When the first advance / retreat rod 22 and the second advance / retreat rod 23 return to the initial positions S1 and S2, respectively, the drive of the drive motor 21 of the switching device 7 is stopped.

  When the first advancing / retracting rod 22 moves backward, the first shade 5 rotates counterclockwise around the rotation shaft 10 by the spring force (returning force) P2 of the urging portion 19 of the spring 16, and FIG. The second position shown in FIG. 10 is switched to the first position shown in FIG. On the other hand, even if the second advance / retreat rod 23 moves backward, the second shade 6 maintains the first position shown in FIG. As a result, the first shade 5 and the second shade 6 are switched from the mid beam posture to the low beam posture, and the light distribution pattern is changed from the light distribution pattern MP for the highway shown in FIG. 11C to FIG. It switches to the light distribution pattern LP for passing shown in FIG.

  Next, the case where the light distribution pattern LP for passing is switched to the light distribution pattern HP for traveling will be described. The drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in one direction. Then, the rotational force in one direction of the drive shaft 25 is applied to the first advance / retreat rod 22 via the drive gear 32 and the first driven gear 30, and to the second advance / retreat rod 23 via the drive gear 32 and the second driven gear 31. , Transmitted as advance / retreat force respectively. As a result, the second advance / retreat rod 23 is moved from the initial position S2 shown in FIGS. 2 (A) and 7 to the position shown in FIGS. 3 (A) and 8 (substantially the same position as the initial position S1 of the first advance / retreat rod 22). 3A and 9B, the forward position A2 (substantially the same as the forward position A1 of the first advance / retreat rod 22; in FIG. 9, slightly higher than the advance position A1 of the first advance / retreat rod 22). To the position of).

  On the other hand, when the first advance / retreat rod 22 advances from the initial position S1 shown in FIGS. 2A and 7 to the advance position A1 shown in FIGS. 3A and 8, the first driven gear 30 contacts the stopper 33. Therefore, the forward movement of the first advance / retreat rod 23 is restricted. At this time, the second advance / retreat rod 23 is located at the position shown in FIGS. 3 (A) and 8 (substantially the same position as the initial position S1 of the first advance / retreat rod 22). 9 continues to advance to a forward position A2 shown in FIG. 9 (substantially the same position as the forward position A1 of the first forward / backward rod 22). For this reason, the driving force of the driving motor 21, that is, the rotational force in one direction of the driving shaft 25 is continuously transmitted as the advancing / retreating force to the first advancing / retracting rod 22 via the driving gear 32 and the first driven gear 30. . As a result, the nut member 28 moves from the upper side to the lower side against the spring force of the compression coil spring 29 by the screw feeding action of the screw portion of the first advance / retreat rod 22 and the nut member 28. 22 rotates but does not move forward. That is, the first advancing / retracting rod 22 is in an idle state and stopped at the advancing position S1 until the second advancing / retreating rod 23 reaches the advancing position S2 after reaching the advancing position S1. When the second advance / retreat rod 23 advances a predetermined distance (the distance from the initial position S2 shown in FIGS. 2A and 7 to the advance position S2 shown in FIGS. 3B and 9), the switching device 7 drive motor 21 is stopped.

  When the first advance / retreat rod 22 moves forward to the advance position A1, the first shade 5 moves around the rotation axis 10 against the spring force P2 of the urging portion 19 of the spring 16, as shown in FIG. It rotates clockwise and switches from the first position to the third position (the positions shown in FIGS. 9 and 12A and 12B). The third position of the first shade 5 is substantially the same position as the first position. On the other hand, when the second advance / retreat rod 23 advances to the advance position A2, the second shade 6 resists the spring force P2 of the urging portion 19 of the spring 16 as shown in FIG. It rotates clockwise and switches from the first position to the third position (the positions shown in FIGS. 9 and 12A and 12B). As a result, the first shade 5 and the second shade 6 are switched from the low beam posture to the high beam posture where a traveling light distribution pattern HP (high beam) is obtained. At this time, the first movable part 51 of the first shade 5 and the second movable part 62 of the second shade 6 are connected to the urging part 19 of the spring 16, the first advance / retreat rod 22 and the second advance / retreat rod 23 of the switching device 7. Therefore, the first shade 5 and the second shade 6 are supported around the rotary shaft 10 without backlash.

  When the first shade 5 and the second shade 6 are switched to the high beam posture, as shown in FIGS. 12A and 12B, the edges 541 and 542 of the front shade portion 50F and the rear shade portion 50B of the first shade 5 are used. , 543 and the edges 641, 642, 643 of the shade part 60 of the second shade 6 are located significantly below the left-right horizontal line HL-HR. As a result, a traveling light distribution pattern HP is obtained as shown in FIG.

  That is, since the reflected light travels over the entire surface of the condenser lens 4, it is irradiated forward as a high beam. For this reason, as shown in FIG. 12C, a predetermined light distribution pattern HP for traveling is obtained. The predetermined light distribution pattern HP is divided into the cut-off lines CL1L, CL2L, CL3L of the light distribution pattern LP for passing the upper edge of the light distribution pattern, and the cut-off lines CL1M, CL2M of the light distribution pattern MP for the motorway. Since it is located significantly above the CL3M, it is possible to illuminate further away from the road than the light distribution pattern LP for passing and the light distribution pattern MP for motorway. Thereby, this predetermined light distribution pattern HP for traveling is an optimal light distribution pattern when the host vehicle travels at a high speed without an oncoming vehicle.

  Then, a case where the traveling light distribution pattern HP is switched back to the passing light distribution pattern LP will be described. The drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in the reverse direction. Then, the rotational force in the reverse direction of the drive shaft 25 causes the first advance / retreat rod 22 via the drive gear 32 and the first driven gear 30, and the second advance / retreat rod 23 via the drive gear 32 and the second driven gear 31. , Transmitted as advance / retreat force respectively. As a result, the second advance / retreat rod 23 moves from the advance position A2 shown in FIGS. 3 (B) and 9 (substantially the same position as the advance position A1 of the first advance / retreat rod 22) to the position shown in FIGS. 3 (A) and 8. After going through (substantially the same position as the initial position S1 of the first advance / retreat rod 22), it moves backward to the initial position S2 shown in FIG. 2 (A) and FIG.

  On the other hand, the nut member 28 moves from the lower side to the upper side by the screw feeding action of the screw portion of the first advance / retreat rod 22 and the nut member 28 and the spring force of the compression coil spring 29, so the first advance / retreat rod 22 rotates. Will not retreat. When the nut member 28 comes into contact with the housing 20 and the movement of the nut member 28 is restricted, the first advance / retreat rod 22 starts to move backward from the advance position A1 shown in FIGS. 3 (A) and 8 to FIG. Retract to the initial position S1 shown in FIG. When the first advance / retreat rod 22 and the second advance / retreat rod 23 return to the initial positions S1 and S2, respectively, the drive of the drive motor 21 of the switching device 7 is stopped.

  When the first advancing / retracting rod 22 is retracted to the initial position S1, the first shade 5 is rotated counterclockwise around the rotating shaft 10 by the spring force (returning force) P2 of the urging portion 19 of the spring 16. The third position shown in FIG. 12B is switched to the first position shown in FIG. On the other hand, when the second advancing / retracting rod 23 is retracted to the initial position S2, the second shade 6 is rotated counterclockwise around the rotating shaft 10 by the spring force (returning force) P2 of the urging portion 19 of the spring 16. The third position shown in FIG. 12 (B) is switched to the first position shown in FIG. 10 (B). As a result, the first shade 5 and the second shade 6 are switched from the high beam posture to the low beam posture, and the light distribution pattern is shown in FIG. 10C from the traveling light distribution pattern HP shown in FIG. Switch to the light distribution pattern LP for passing and return.

  Note that the light distribution pattern MP for the expressway shown in FIG. 11C is switched to the light distribution pattern HP for travel shown in FIG. 12C, or the light distribution for travel shown in FIG. It is also possible to switch from the pattern HP to the light distribution pattern MP for highways shown in FIG.

  The headlamp 1 according to the first embodiment is configured and operated as described above, and the effects thereof will be described below.

  In the headlamp 1 according to the first embodiment, when the first shade 5 and the second shade 6 are switched to the low beam posture by the switching device 7, the reflected light from the reflecting surface of the reflector 3 toward the projection lens 4 is switched to the low beam. Therefore, the light distribution pattern LP for passing is obtained. Similarly, when the first shade 5 and the second shade 6 are switched to the mid beam posture by the switching device 7, the reflected light from the reflecting surface of the reflector 3 toward the projection lens 4 is switched to the mid beam. The light distribution pattern MP is obtained. Further, similarly, when the first shade 5 and the second shade 6 are switched to the high beam posture by the switching device 7, the reflected light from the reflecting surface of the reflector 3 toward the projection lens 4 is switched to the high beam. A pattern HP is obtained. As described above, the headlamp 1 according to the first embodiment can obtain three light distribution patterns of the light distribution pattern LP for passing, the light distribution pattern MP for highways, and the light distribution pattern HP for traveling.

  Further, since the headlamp 1 according to the first embodiment uses the drive motor 21 as a drive source of the switching device 7, the headlamp 1 is superior in durability because it generates less heat than the solenoid. Moreover, the headlamp 1 according to the first embodiment switches the postures of the first shade 5 and the second shade 6 as the first advance / retreat rod 22 and the second advance / retreat rod 23 advance / retreat by the driving force of the drive motor 21. Therefore, compared with the technique of switching the position of the shade by switching the plunger by the electromagnet or spring of the solenoid, the noise is small, and the comfort in the vehicle (automobile) is good.

  In particular, in the headlamp 1 according to the first embodiment, after the first advance / retreat rod 22 reaches the advance position A1 and the first shade 5 and the second shade 6 are switched to the mid beam posture by the idle mechanism 26, The first advancing / retracting rod 22 is in an idle state until the second advancing / retreating rod 23 reaches the advance position A2 and the first shade 5 and the second shade 6 are switched to the high beam posture. For this reason, the headlamp 1 according to the first embodiment is switched to the mid-beam attitude of the first shade 5 and the second shade 6 by the advancement of the first advance / retreat rod 22 and the first advancement of the second advance / retreat rod 23. Since the switching of the first shade 5 and the second shade 6 to the high beam posture can be made independent, the forward movement of the first forward / backward rod 22 and the forward movement of the second forward / backward rod 23 affect the first shade 5 and the second shade 6. The light distribution patterns LP, MP, and HP can be switched reliably and accurately without affecting the switching of the posture.

  In the headlamp 1 according to the first embodiment, the distance between the initial position S1 of the first advance / retreat rod 22 and the first movable part 51 is substantially 0, and the initial position S2 of the second advance / retreat rod 23 is Since it is smaller than the distance with the 2nd movable part 61, if the 1st advance / retreat rod 22 and the 2nd advance / retreat rod 23 move forward at the same speed, the 1st advance / retreat rod 22 which contact | abutted to the 1st movable part 51 first will be first. Reaches the forward movement position A1 and the first shade 5 is switched from the first position to the second position, that is, the mid-beam attitude, and then the second forward / backward rod 23 comes into contact with the second movable portion 61 to reach the forward movement position A2. The second shade 6 is switched from the first position to the third position, that is, the high beam posture. For this purpose, the headlamp 1 according to the first embodiment is switched from the first position to the second position of the first shade 5 by the advancement of the first advance / retreat rod 22, that is, from the mid-beam attitude, to the second advance / retreat. Since the switching of the second shade 6 from the first position to the third position, that is, the switching to the high beam posture by the advance of the rod 23 can be made independent, the advance of the first advance / retreat rod 22 and the advance of the second advance / retreat rod 23 are made. Therefore, the light distribution patterns LP, MP, and HP can be switched reliably and accurately without affecting the switching of the posture of the first shade 5 and the switching of the posture of the second shade 6. Moreover, in the headlamp 1 according to the first embodiment, the first advancing / retracting rod 22 and the second advancing / retreating rod 23 are simply shifted from the initial position S1 of the first advancing / retreating rod 22 and the initial position S2 of the second advancing / retreating rod 23. Can be advanced at the same speed, the structure of the driving force transmission mechanism 24 of the switching device 7 can be simplified, and the manufacturing cost can be reduced accordingly.

  Furthermore, since the headlamp 1 according to the first embodiment uses one drive motor 21 as a drive source for the switching device 7, the headlamp 1 can be reduced in size as compared with the switching device using two solenoids. In addition, since the number of parts can be reduced, the manufacturing cost is reduced accordingly.

  13 to 17 show a second embodiment of a headlamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 12 denote the same components. The configuration of the headlamp according to the second embodiment will be described.

  As shown in FIG. 13, first support portions 55 and notches 56 are respectively provided at the left and right ends of the front shade portion 50F of the first shade 5, and the front shade portion 50F of the first shade 5 is provided. A common movable part 57 is provided at the lower part so as to protrude to the front side. On the other hand, second support portions 65 are respectively provided at the left and right ends of the shade portion 60 of the second shade 6, and the second support portion 65 projects forward from the notch 56. The first support part 55 and the second support part 65 are rotatably supported by the rotary shaft 10, respectively. The common movable portion 57 faces the first advance / retreat rod 22 and the second advance / retreat rod 23 of the switching device 7.

  Although not shown in the drawings, a return member (for example, a spring) is provided between the first shade 5 and the second shade 6 side and the rotary shaft 10 and the frame 11 side. Yes. Like the spring 16 of the first embodiment, the return member returns the first shade 5 and the second shade 6 from the mid-beam posture or the high-beam posture to the low-beam posture, or the first shade 5 and the second shade 6. This is for maintaining the neutral position of the shade 6 and preventing backlash and lateral backlash around the rotation shaft 10 of the first shade 5 and the second shade 6 via the common movable portion 57.

  The headlamp according to Example 2 is configured as described above, and the operation thereof will be described below.

  As shown in FIG. 14, when the positions of the first advancing / retreating rod 22 and the second advancing / retreating rod 23 of the switching device 7 are respectively located at the initial positions S1 and S2, the tip of the first advancing / retreating rod 22 is the second advancing / retreating rod. It is located above the tip of 23 and is in contact with the lower surface of the portion of the common movable portion 57 of the first shade 5 that is in front of the first support portion 52. At this time, as shown in FIG. 17A, the first shade 5 and the second shade 6 are in a low beam posture in which a light distribution pattern LP (low beam) for passing can be obtained. That is, the edges 541, 542, 543 of the front shade portion 50F and the rear shade portion 50B of the first shade 5 are located slightly above the edges 641, 642, 643 of the shade portion 60 of the second shade 6. For this reason, as shown in FIG. 10C, a passing light distribution pattern LP having cut-off lines CL1L, CL2L, and CL3L is obtained.

  Next, when the first advance / retreat rod 22 and the second advance / retreat rod 23 are positioned at the initial positions S1 and S2, respectively, the drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in one direction. Then, the first advance / retreat rod 22 moves forward from the initial position S1 shown in FIG. 14 to the advance position A1 shown in FIG. 15, while the second advance / retreat rod 23 moves from the initial position S2 shown in FIG. 14 to the position shown in FIG. It moves forward (substantially the same position as the initial position S1 of the first advance / retreat rod 22). As the first advance / retreat rod 22 moves forward, the first shade 5 rotates clockwise around the rotation shaft 10 against the return force of the return member, as shown in FIG. The first position (position shown in FIG. 17A) is switched to the second position (position shown in FIG. 17B). On the other hand, the second shade 6 maintains the first position. As a result, the first shade 5 and the second shade 6 are switched from the low beam posture to the mid beam posture. That is, the edges 541, 542, 543 of the front shade portion 50F and the rear shade portion 50B of the first shade 5 are positioned slightly below the edges 641, 642, 643 of the shade portion 60 of the second shade 6. . For this reason, as shown in FIG. 11C, a light distribution pattern MP for a highway having cutoff lines CL1M, CL2M, and CL3M is obtained.

  Then, when the first shade 5 and the second shade 6 are in the mid-beam posture, the drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in the reverse direction. Then, the first advance / retreat rod 22 moves back from the advance position A1 shown in FIG. 15 to the initial position S1 shown in FIG. 14, while the second advance / retreat rod 23 moves to the position shown in FIG. The vehicle moves backward from an approximately same position as the position S1) to an initial position S2 shown in FIG. As the first advancing / retracting rod 22 moves backward, the first shade 5 rotates counterclockwise around the rotating shaft 10 by the restoring force of the restoring member, as shown in FIG. The position is switched from the first position to the first position, while the second shade 6 maintains the first position. As a result, the first shade 5 and the second shade 6 are switched from the mid-beam posture to the low-beam posture, and switched from the light distribution pattern MP for highways to the light distribution pattern LP for passing.

  Next, when the first advance / retreat rod 22 and the second advance / retreat rod 23 are positioned at the initial positions S1 and S2, respectively, the drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in one direction. Then, when the first advance / retreat rod 22 moves forward from the initial position S1 shown in FIG. 14 to the advance position A1 shown in FIG. 15, the idle mechanism 26 is in an idle state and stopped at the advance position S1 due to the action of the idle mechanism 26. On the other hand, the second advance / retreat rod 23 advances from the initial position S2 shown in FIG. 14 to the advance position A2 shown in FIG. 16 via the position shown in FIG. 15 (substantially the same position as the initial position S1 of the first advance / retreat rod 22). As the second advancing / retracting rod 23 moves forward, as shown in FIG. 17C, the first shade 5 rotates clockwise around the rotary shaft 10 against the restoring force of the restoring member, The edge of the notch 56 of the front shade portion 50F hits the second support portion 65, and the second shade 6 is also synchronized with the first shade 5 in the clockwise direction around the rotary shaft 10 against the return force of the return member. Rotate. As a result, the first shade 5 and the second shade 6 are switched from the low beam posture to the high beam posture by switching from the first position to the third position (position shown in FIG. 17C). That is, the edges 541, 542, 543 of the front shade portion 50F and the rear shade portion 50B of the first shade 5 and the edges 641, 642, 643 of the shade portion 60 of the second shade 6 are significantly larger than the left-right horizontal line HL-HR. Located on the lower side. For this reason, as shown in FIG. 12C, a traveling light distribution pattern HP is obtained. The distance from the initial position S2 of the second advance / retreat rod 23 to the advance position A2 is greater than the distance from the initial position S1 to the advance position A1 of the first advance / retreat rod 22 from the second position to the third shade. Long enough to switch to position.

  Then, when the first shade 5 and the second shade 6 are in the high beam posture, the drive motor 21 of the switching device 7 is driven to rotate the drive shaft 25 in the reverse direction. Then, the first advance / retreat rod 22 moves backward from the idle state shown in FIG. 16 to the advance position A1 shown in FIG. 15 to the initial position S1 shown in FIG. 14, while the second advance / retreat rod 23 moves to the advance position shown in FIG. From A2 to the initial position S2 shown in FIG. 14 through the position shown in FIG. 15 (substantially the same position as the initial position S1 of the first advance / retreat rod 22). As the second advance / retreat rod 23 moves backward, the first shade 5 and the second shade 6 rotate counterclockwise around the rotary shaft 10 by the return force of the return member, as shown in FIG. To do. As a result, when the first shade 5 and the second shade 6 are switched from the third position to the first position, the high beam posture is switched to the low beam posture, so that the light distribution pattern LP for passing from the light distribution pattern HP for passing is changed. Switch to

  Since the headlamp according to the second embodiment is configured and operated as described above, substantially the same effect as the headlamp 1 according to the first embodiment can be achieved.

  In the first and second embodiments, the case where the vehicle is on the left side will be described. When the vehicle is on the right side, the cut-off line CL1L, CL2L, CL3L, CL1M, CL2M, CL3M of the light distribution pattern, and the edges 541, 542, 543, 641, 642, 643 of the first shade 5 and the second shade 6 etc. However, the left-hand traffic is reversed.

  The light distribution patterns LP, MP, and HP may be switched manually by the driver. For example, the state of the vehicle and the running of the vehicle may be performed by an adaptive lighting system AFS (Adaptive Front-lighting System). It may be performed automatically according to the environment.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole longitudinal cross-sectional view which shows Example 1 of the headlamp concerning this invention. Similarly, it is a longitudinal sectional view showing the internal structure of the switching device. Similarly, it is explanatory drawing which shows the action | operation of a switching apparatus. Similarly, it is a perspective view which shows a 1st shade, a 2nd shade, and a switching device. Similarly, it is explanatory drawing which shows the effect | action of a spring. Similarly, it is a top view which shows a 1st shade, a 2nd shade, and a switching device. Similarly, it is a front view showing a first shade and a second shade in a low beam posture and a switching device. Similarly, it is a front view showing a first shade and a second shade in a mid-beam posture and a switching device. Similarly, it is a front view which shows the 1st shade and 2nd shade of a high beam attitude | position, and a switching apparatus. Similarly, it is explanatory drawing which shows the light distribution pattern for passing with the 1st shade and 2nd shade of a low beam attitude | position. Similarly, it is explanatory drawing which shows the light distribution pattern for the 1st shade and 2nd shade of a mid-beam attitude | position, and a highway. Similarly, it is explanatory drawing which shows the 1st shade and 2nd shade of a high beam attitude | position, and the light distribution pattern for driving | running | working. It is a perspective view of the 1st shade, the 2nd shade, and the change device which show Example 2 of the headlamp concerning this invention. Similarly, it is a front view showing a first shade and a second shade in a low beam posture and a switching device. Similarly, it is a front view showing a first shade and a second shade in a mid-beam posture and a switching device. Similarly, it is a front view which shows the 1st shade and 2nd shade of a high beam attitude | position, and a switching apparatus. Similarly, it is sectional drawing which shows the low beam attitude | position of a 1st shade, and a 2nd shade, a mid beam attitude | position, and a high beam attitude | position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headlamp 2 Discharge lamp 3 Reflector 4 Projection lens 5 1st shade 6 2nd shade 50F Front shade part 50B Rear shade part 60 Shade part 50, 56 Notch 51 1st movable part 61 2nd movable part 52, 55 1st Support part 62 Second support part 541, 641 Lower horizontal edge 542, 642 Diagonal edge 543, 643 Upper horizontal edge 57 Common movable part 7 Switching device 8 Socket mechanism 9 Holder 10 Rotating shaft 11 Frame 12 Fixed part 13 Restricting part 14 Stopper part DESCRIPTION OF SYMBOLS 15 Press part 16 Spring 17 Fixing part 18 Coil part 19 Energizing part 20 Housing 21 Drive motor 22 First advance / retreat rod 23 Second advance / retreat rod 24 Drive force transmission mechanism 25 Drive shaft 26 Idle mechanism 27 Second feed screw mechanism 28 Nut member 29 Compression coil spring 30 No. Follower gear 31 Second follower gear 32 Drive gear 33 Stopper F1 First focus F2 Second focus LP Light distribution pattern for passing MP Light distribution pattern for highway HP Light distribution pattern for traveling CL1L, CL1M Upper horizontal cut-off line CL2L , CL2M Oblique cut-off line CL3L, CL3M Lower horizontal cut-off line P1, P2 Spring force F Front B Rear U Top D Bottom L Left R Right VU-VD Vertical vertical line HL-HR Horizontal horizontal line S1 Initial position of the first forward / backward rod S2 First Initial position of 2 advance / retreat rod A1 Advance position of 1st advance / retreat rod A2 Advance position of 2nd advance / retreat rod

Claims (3)

In a projector type headlamp that can obtain a light distribution pattern for passing, a light distribution pattern for highways, and a light distribution pattern for traveling,
A light source;
A reflector for reflecting light from the light source;
A projection lens that projects the reflected light from the reflector forward;
The reflected light traveling from the reflector toward the projection lens can be obtained as a low beam from which the light distribution pattern for passing can be obtained, a mid beam from which the light distribution pattern for the expressway can be obtained, and the light distribution pattern for traveling. A first shade and a second shade for switching to a high beam;
A switching device for switching the first shade and the second shade to a low beam posture from which the low beam is obtained, a mid beam posture from which the mid beam is obtained, and a high beam posture from which the high beam is obtained;
With
The switching device includes a housing, a drive motor provided in the housing, a first advance / retreat rod and a second advance / retreat rod provided in the housing so as to be able to advance and retreat, the drive motor, and the first advance / retreat rod. And a driving force transmission mechanism provided between the second forward / backward rod and moving the first forward / backward rod and the second forward / backward rod in the same direction.
When both the first advance / retreat rod and the second advance / retreat rod are in the initial position, the first shade and the second shade are switched to the low beam posture, and the first advance / retreat rod moves forward to advance to the initial position. When reaching the forward position from the position, the first shade and the second shade are switched to the mid beam posture, and when the second forward / backward rod moves forward and reaches the forward position from the initial position, the first shade The shade and the second shade are switched to the high beam posture;
A headlamp characterized by that.   The first advancing / retreating rod has an idle mechanism that stops the first advancing / retreating rod at the forward movement position after the first advancement / retraction rod reaches the forward movement position until the second advancement / retraction rod reaches the forward movement position. The headlamp according to claim 1, wherein the headlamp is provided. The first shade is provided with a first movable portion that switches the first shade to a mid beam posture by contact and advance of the first advance / retreat rod.
The second shade is provided with a second movable portion that switches the second shade to a high beam posture by contact and advance of the second advance / retreat rod,
The first movable part and the second movable part are located at substantially the same level when the first shade and the second shade are in the low beam posture,
A distance between the initial position of the first advance / retreat rod and the first movable part is smaller than a distance between the initial position of the second advance / retreat rod and the second movable part;
The headlamp according to claim 1 or 2, characterized in that

Images