JP2004172104A - Head lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an overhead sign irradiated light without drastically changing design, structure, configuration, etc. of a shade. <P>SOLUTION: A length of a front side movable shade 10 is formed shorter than that of a rear side movable shade 11, and reflecting faces 100, 110 are provided on mutually faced inner surfaces of the shades 10, 11, respectively. Consequently, while a part L of a reflected light from a reflector 3 is entered into a gap S between two pieces of the shades 10, 11 with a thin plate structures and reflected from the reflecting faces 100, 110 of the shades 10, 11, the part L of the reflected light is passed through the gap S between the shades 10, 11. The light L passed through the shades 10, 11 is entered into roughly lower part of a light collective lens 4 to pass through the lens 4 and radiated on an overhead sign side. Herewith, the overhead sign irradiated light may be obtained without drastically changing the design, structure, configuration, etc. of the shade. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a headlamp that irradiates a part of irradiation light to an overhead sign (an overhead sign installed above a road surface in front of a vehicle). In particular, the present invention relates to a headlamp that does not require a significant change in the design, configuration, structure, and the like of a shade, and that can reliably obtain overhead sign irradiation light.

  In this specification, "road surface" refers to a road surface and people (pedestrians and the like) and objects (preceding vehicles, oncoming vehicles, road signs, buildings, and the like) on the road surface. The "vertical direction" refers to the vertical direction when the headlamp of the present invention is mounted on an automobile.

  A headlamp for irradiating a part of irradiation light to an overhead sign side has been conventionally known (for example, see Patent Document 1). Hereinafter, this headlamp will be described. This headlamp includes a light source (12), a reflector (14) for reflecting light from the light source (12), and a condenser lens (18) for irradiating the road surface with reflected light from the reflector (14). A shade (22) arranged between the reflector (14) and the condenser lens (18) to form a predetermined light distribution pattern; and a deflecting / reflecting projection (24) provided on the shade (22). And

  Next, the operation of the headlamp will be described. The light source (12) is turned on. Then, light from the light source (12) is reflected by the reflector (14). The reflected light is irradiated forward through the condenser lens (18). At this time, a predetermined light distribution pattern, for example, a passing light distribution pattern is obtained by the shade (22). Then, a part of the reflected light is deflected and reflected by the deflecting / reflecting projection (24), enters the lower side of the condenser lens (18), and irradiates the overhead sign side through the condenser lens (18).

JP 2001-35218 A (paragraph numbers “0023” to “0039”, FIGS. 1, 2, 4, and 7)

  However, in the above-described headlamp, it is necessary to provide the shade (22) with a deflecting / reflecting projection (24) in order to obtain overhead sign irradiation light. The deflecting / reflecting projection (24) is complicated in shape, size, configuration, and the like. For this reason, in the above-mentioned headlamp, it is necessary to largely change the design, configuration, structure and the like of the shade.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a headlamp that does not require significant changes in the design, configuration, structure, and the like of a shade, and that can reliably obtain overhead sign irradiation light.

  In order to achieve the above object, the invention according to claim 1 is a shade having a two-plate structure, wherein the length of the front shade is shorter than the length of the rear shade, and the front shade and the rear shade are provided. A reflection surface is provided on each of the inner surfaces facing each other, and the reflection surface of the front shade is a light guide reflection surface that reflects a part of the light reflected from the reflector to the rear shade side. The reflection surface of the side shade is an output reflection surface that reflects light from the light guide reflection surface of the front side shade to the lower side of the condenser lens and irradiates the light to the overhead sign side.

  As a result, according to the first aspect of the present invention, in the two-plate shade, the length of the front shade is shorter than the length of the rear shade, and the front shade and the rear shade face each other. By providing a reflection surface on each of the inner side surfaces, overhead sign irradiation light can be obtained. As described above, the invention according to claim 1 does not require a significant change in the design, configuration, structure, and the like of the shade.

  The invention according to claim 2 is characterized in that a light diffusing means is provided on at least one of the light guide reflection surface of the front shade and the output reflection surface of the rear shade.

  As a result, the light according to the second aspect of the present invention is diffused by the light diffusing means provided on at least one of the reflecting surfaces of the two-piece shade, so that the overhead sign has an appropriate illuminance. Irradiation is performed over a wide range. In addition, by adjusting the light diffusing means, it is possible to adjust the illuminance and irradiation range of the light irradiated on the overhead sign side.

  In the invention according to claim 3, the light diffusion means is a bead projecting toward the front shade side at a position facing the lower end of the light guide reflection surface of the front shade, of the output reflection surface of the rear shade. It is characterized by the following.

  As a result, according to the third aspect of the present invention, the bead is provided at a position facing the lower end of the front shade of the rear shade, that is, at a position where light is reflected and output to the condenser lens side. Light reflected and output to the optical lens side can be reliably and efficiently diffused.

  According to the third aspect of the present invention, since the bead is provided at a position separated downward from the upper end of the rear side shade, there is almost no influence on the upper end of the rear side shade caused by the bead provided. As a result, there is no influence on the light distribution pattern formed by shielding the upper end of the rear shade.

  Further, in the invention according to claim 3, since the strength of the rear side shade of the thin plate structure is improved by the bead, the strength of the front side shade of the two-piece structure is also improved, and the shapes of the rear side shade and the front side shade are improved. Since it is securely held, the light distribution pattern is not affected by the deformation of the shade, and the light distribution performance is improved.

  The invention according to claim 4 is that, as a shade, by switching the posture of the shade, a predetermined light distribution pattern for a predetermined passing light and a predetermined light distribution pattern for a traveling can be obtained by one light source. It is a movable shade of a two-lamp type headlamp obtained by switching.

  As a result, in the invention according to claim 4, the weight of the movable shade can be reduced because the movable shade is formed of two thin plate-shaped shades. For this reason, since the switching force of the means for switching the movable shade can be reduced, an inexpensive switching means having a small switching force can be used, and the manufacturing cost is correspondingly reduced. Moreover, since the weight of the movable shade is light, the switching operation of the movable shade can be easily and accurately performed by the switching means, so that the light distribution pattern can be accurately switched.

  The invention according to claim 5 is characterized in that at least one of the opposing movable shades is provided with a light amount reducing means.

  As a result, in the invention according to claim 5, the light amount reducing means reduces the amount of light passing between the movable shades. According to the fifth aspect of the present invention, since the amount of light passing between the movable shades is smaller than the amount of light not passing between the movable shades, for example, the light is emitted toward the overhead sign in the light distribution pattern. There is an advantage that the illuminance of the light distribution pattern is smaller than the illuminance of the passing light distribution pattern.

  The invention according to claim 6 is characterized in that an irradiation direction regulating means is provided on the rear shade.

  As a result, in the invention according to claim 6, the irradiation direction of the light passing through the shade is regulated by the irradiation direction regulating means toward the overhead sign. Thus, the invention according to claim 6 has an advantage that, for example, the light distribution pattern OP relating to the overhead sign can be formed at an arbitrary position.

  As is apparent from the above, according to the headlamp according to the present invention (claim 1), in the shade having two thin plates, the length of the front shade is shorter than the length of the rear shade, and By providing reflective surfaces on the inner surfaces of the side shade and the rear side shade that oppose each other, it is possible to obtain overhead sign irradiation light, so it is necessary to significantly change the design, configuration, structure, etc. of the shade. Absent.

  Further, according to the headlamp according to the present invention (claim 2), light is diffused by the light diffusion means provided on at least one of the reflection surfaces of the two-piece shade. The overhead sign is illuminated with appropriate illuminance and in a wide range. In addition, by adjusting the light diffusing means, it is possible to adjust the illuminance and irradiation range of the light irradiated on the overhead sign side.

  Further, according to the headlamp according to the present invention (claim 3), the bead is located at a position facing the lower end of the front shade of the rear shade, that is, at a position where light is reflected and output to the condenser lens side. Is provided, the light reflected and output to the condenser lens side can be diffused reliably and efficiently.

  Further, according to the headlamp according to the present invention (claim 3), since the bead is provided at a position separated downward from the upper end of the rear side shade, distortion due to the provision of the bead and the like is at the upper end of the rear side shade. Has little effect. As a result, there is no influence on the light distribution pattern formed by shielding the upper end of the rear shade.

  Further, according to the headlamp according to the present invention, since the strength of the rear shade of the thin plate structure is improved by the bead, the strength of the front shade of the two-piece structure is also improved, and the rear shade is improved. Further, since the shape of the front side shade is securely held, the light distribution pattern is not affected by the deformation of the shade, and the light distribution performance is improved.

  Further, according to the headlamp according to the present invention (claim 4), since the movable shade is composed of two thin plate-shaped shades, the weight of the movable shade can be reduced. For this reason, since the switching force of the means for switching the movable shade can be reduced, an inexpensive switching means having a small switching force can be used, and the manufacturing cost is correspondingly reduced. Moreover, since the weight of the movable shade is light, the switching operation of the movable shade can be easily and accurately performed by the switching means, so that the light distribution pattern can be accurately switched.

  Also, according to the headlamp according to the present invention (claim 5), at least one of the opposing movable shades is provided with the light quantity reducing means, so that the light quantity reducing means reduces the light quantity of the light passing between the movable shades. Let it. For this reason, since the amount of light passing between the movable shades is smaller than the amount of light not passing between the movable shades, for example, the illuminance of the light distribution pattern irradiated toward the overhead sign in the light distribution pattern Can be made smaller than the illuminance of the light distribution pattern for passing.

  Further, according to the headlamp according to the present invention (claim 6), since the irradiation direction regulating means is provided on the rear shade, the light passing through the shade changes the irradiation direction to the overhead sign side by the irradiation direction regulating means. Regulated in the direction. For this reason, for example, there is an advantage that a light distribution pattern for an overhead sign can be formed at an arbitrary position.

  Hereinafter, three examples of embodiments of a headlamp according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited by the embodiment.

  1 to 8 show a first embodiment of a headlamp according to the present invention. This example describes a two-lamp type headlamp.

(Description of Configuration of First Embodiment)
1 to 4, reference numeral 1 denotes a projector type headlamp. The headlamp 1 includes a discharge lamp 2 as a light source, a reflector 3, a condenser lens 4, a shade 5, a solenoid 6 and a spring member 7 as switching means.

  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 near the first focal point F1 of the reflector 3.

  The inner concave surface of the reflector 3 is formed by, for example, aluminum evaporation or silver coating, for example, from a reflecting surface whose vertical cross section in FIG. 2 forms an elliptical surface and whose horizontal cross section in FIG. 3 forms a paraboloid or a deformed paraboloid. Become. For this purpose, the reflecting surface of the reflector 3 has a first focal point F1 and a second focal point (focal line on a horizontal section) F2. The reflector 3 is fixedly held by a holder (frame) 9.

  Although not shown, the condenser lens 4 has a focal plane (meridional image plane) on the object space side in front of the second focal point F2 (on the condenser lens 4 side with respect to the discharge lamp 2). The condenser lens 4 is fixedly held by a holder 9.

  The shade 5 irradiates the irradiation light from the condenser lens 4 with a low beam in which a predetermined light distribution pattern LP for passing shown in FIG. 8 and a predetermined light distribution pattern HP for traveling shown in FIG. To switch to the high beam. FIGS. 8 and 9 are explanatory diagrams of the light distribution pattern projected on the screen 10 m away from the headlamp 1 of the first embodiment. In the figure, reference numeral “HL-HR” indicates horizontal lines on the left and right of the screen, and reference numeral “VU-VD” indicates vertical lines on the upper and lower sides of the screen.

  On the other hand, the solenoid 6 and the spring member 7 serving as the switching means move the shade 5 into a low beam posture (the posture indicated by a solid line in FIGS. 6 and 7) for obtaining the low beam and a high beam posture for obtaining the high beam. (The posture indicated by the two-dot chain line in FIGS. 6 and 7).

  The shade 5 includes movable shades 10 and 11 as switching portions for switching between the low beam and the high beam, and a fixed shade 12 as other portions. In this example, the movable shades 10 and 11 and the fixed shade 12 have a thin plate structure having elasticity such as SUS (spring steel plate). The thickness of the movable shades 10 and 11 is smaller than the thickness of the fixed shade 12.

  The movable shades 10 and 11 are portions that can be switched between a low beam posture and a high beam posture by the solenoid 6 and the spring member 7. The movable shades 10 and 11 are composed of a thin plate on the front side (condensing lens 4 side) (ie, the front movable shade 10) and a thin plate on the rear side (discharge lamp 2 side) (ie, the rear movable shade 11). It is composed of two thin plates fixed by caulking 32 (or riveting or spot welding, etc.). As shown in FIG. 5, a slight gap S is provided between the movable shades 10 and 11 having the two thin plate structures, that is, between the front movable shade 10 and the rear movable shade 11. In addition, the movable shades 10 and 11 having the two thin plate structures face each other substantially in parallel with the gap S interposed therebetween.

  Of the movable shades 10 and 11, the length (height) of the rear movable shade 11 in the vertical direction is the same as the stroke of moving the movable shades 10 and 11 by the solenoid 6 and the spring member 7. Have. In this example, since the movable shades 10 and 11 move up and down as shown in FIGS. 6 and 7, the length (height) of the rear movable shade 11 in the up and down direction is the movable shade. The length is almost the same as the vertical movement strokes of 10, 10. Further, of the movable shades 10 and 11, the length (height) of the front movable shade 10 in the vertical direction is about one half of the length (height) of the rear movable shade 11 in the vertical direction. It is. Further, as shown in FIG. 3, the shape of the movable shades 10 and 11 has a curved shape in which a central portion is convex toward the discharge lamp 2 when viewed from above.

  Edge portions 13 forming cut lines CL of the light distribution pattern LP for passing are formed on upper edges (upper edges) of the movable shades 10 and 11 having two thin plate structures, respectively. As shown in FIGS. 1 and 7, the edge portion 13 has a diagonal step of about 45 ° at the center. Due to this step, as shown in FIG. 8, an oblique cut line of about 45 ° is formed between the traveling lane side and the opposite lane side in the passing light distribution pattern LP. The second focal point (focal line on the horizontal cross section) F2 is located at approximately one half of a line Z connecting the edge portions 13 and 13 of the movable shades 10 and 11 having the two thin plate structures. It is preferable from the viewpoint of light distribution control that the second focal point F2 is located substantially in the middle between the movable shades 10 and 11 having the two thin plate structures, but the second focal point F2 is necessarily located in the middle between the movable shades 10 and 11. You don't have to. Note that the line segment Z is also the optical axis of the reflection surface of the reflector 3 passing through the first focal point F1.

  On the other hand, the fixed shade 12 is a portion fixed to the holder 9. The fixed shade 12 includes a ring-shaped fixing portion 17 partially cut out (lower portion) when viewed from the front, a flat plate-shaped stopper portion 18 disposed at the cut-out portion of the fixing portion 17, and a stopper portion. And a shade portion 19 bent from the portion 18.

  The fixing portion 17 is fixed between the holder 9 and the reflector 3 by a screw 20 while being sandwiched between the holder 9 and the reflector 3. The stopper 18 regulates the low beam attitude of the shade 5 when the solenoid 6 is not energized. Further, the shade portion 19 has a function of blocking the reflected light from the reflector 3 and a function of blocking the heat from the discharge lamp 2 to the solenoid 6.

  The solenoid 6 has, for example, a cylindrical plunger (advancing / retracting rod) 14. The solenoid 6 is fixed to the holder 9 together with the spring member 7 by a screw 16, and is disposed below the movable shades 10 and 11. A mounting portion 24 is provided at the tip (upper end) of the plunger 14 of the solenoid 6 via a constricted neck (not shown). The neck and the mounting portion 24 have, for example, a short cylindrical shape. The diameter (size) of the mounting portion 24 is larger than the diameter of the neck portion and smaller than the diameter of the plunger 14. The mounting portion 24 is directly mounted on the spring member 7 integrally formed with the movable shades 10 and 11.

  The solenoid 6 is means for switching from the low beam position to the high beam position by energizing the plunger 14 against the spring force of the spring member 7 and lowering the movable shades 10 and 11 linearly when energized. . As described above, as the solenoid 6, an inexpensive and efficient pull-type (retractable) solenoid can be used. The plunger 14 of the solenoid 6 is in a free state when no power is supplied. That is, it is free to move forward and backward.

  In this example, the spring member 7 has a thin plate structure having elasticity such as SUS (spring steel plate), like the shade 5. The spring member 7 has a dome-shaped structure as shown in FIGS. The upper central part of the spring member 7 and the lower central part of the rear movable shade 11 are connected to each other.

  In other words, the rear movable shade 11 having the thin plate structure and the spring member 7 having the same thin plate structure are integrally formed by press working or the like. On the other hand, the front movable shade 10 having a thin plate structure is similarly formed separately by press working or the like. The rear movable shade 11 integrated with the spring member 7 and the separate front movable shade 10 are fixed by caulking 32. As a result, the movable shades 10 and 11 formed of the two thin plate structures and the spring member 7 form an integral structure.

  The spring member 7 normally holds the movable shades 10 and 11 in the low beam position, flexes when the solenoid 6 is energized, and returns elastically when the energization of the solenoid 6 is cut off. This is means for switching from the high beam attitude to the low beam attitude by linearly raising 10 and 11.

  At the lower central portion of the spring member 7, a mounting portion 15 is provided integrally and orthogonally. The mounting portion 15 is fixed to the holder 9 together with the solenoid 6 by a screw 16 on the holder 9. The attachment portions 15 are formed at both ends of the spring member 7, and are formed by bending the spring members 7 in a dome shape, overlapping them, and fixing them by caulking 32.

  A mounting thin plate portion 25 is provided on the movable shades 10 and 11 and the spring member 7 side. That is, the mounting thin plate portion 25 is formed of the upper central portion of the spring member 7 integrally connected to the rear movable shade 11, and the switching direction (vertical direction) of the movable shades 10, 11 is provided. Is formed in a flat plate shape that is almost perpendicular to. The mounting thin plate portion 25 is provided with a mounting hole (not shown). By engaging the mounting part 24 of the plunger 14 of the solenoid 6 with the edge of the mounting hole, the mounting part 24 of the plunger 14 of the solenoid 6 and the movable shades 10, 11 and the spring member 7 are mounted. The thin plate portion 25 is attached to each other.

  The discharge lamp 2, reflector 3, condenser lens 4, shade 5, solenoid 6, spring member 7, socket mechanism 8 and holder 9, which are components of the headlamp 1, are an outer lens or outer cover (not shown) and a lamp. The headlamp 1 is configured by being disposed in a lamp room (not shown) partitioned with a housing (not shown).

  In the headlamp 1, as shown in FIGS. 2 and 5, reflecting surfaces 100 and 110 are respectively provided on inner surfaces of the two movable shades 10 and 11 having a thin plate structure facing each other. . The reflection surface 100 of the front movable shade 10 is a part of the reflected light from the reflector 3, and the light L that has entered the gap S between the front movable shade 10 and the rear movable shade 11. Is a light-guiding reflection surface that reflects light from the reflection surface 110 of the rear movable shade 11. On the other hand, the reflection surface 110 of the rear movable shade 11 reflects the light from the light guide reflection surface 100 of the front movable shade 10 to the lower side of the condenser lens 4 and irradiates the light to the overhead sign side. Plane.

  A bead 31 as a light diffusing unit is provided at a position of the output reflecting surface 110 of the rear movable shade 11 that faces the lower end of the light guide reflecting surface 100 of the front movable shade 10. The position where the bead 31 is provided is a position separated downward from the edge portion 13 of the rear movable shade 11, and is a position where the light L1 and L2 are emitted. The bead 31 has a concave-convex shape having a semicircular cross section, and protrudes from the rear movable shade 11 toward the front movable shade 10, that is, inward. The bead 31 is provided along the longitudinal direction of the rear movable shade 11.

(Explanation of the operation of the first embodiment)
The headlamp 1 according to the first embodiment is configured as described above, and its operation will be described below.

  First, the discharge lamp 2 is turned on. Then, light from the discharge lamp 2 is reflected by the reflector 3. The reflected light is collected at the second focal point F2 of the reflector 3, diffused through the second focal point F2, and further radiated forward through the condenser lens 4. The irradiation light is irradiated forward as a low beam from which a predetermined light distribution pattern LP for passing shown in FIG. 8 is obtained or as a high beam from which a predetermined light distribution pattern HP for traveling shown in FIG. 9 is obtained. You.

  Here, when the solenoid 6 is not energized, the plunger 14 of the solenoid 6 is in an advanced state (extended state) by the spring force of the spring member 7, and the upper surface of the mounting thin plate portion 25 is located on the lower surface of the stopper portion 18. Hit. The movable shades 10 and 11 are in the low beam posture shown by the solid lines in FIGS. 6 and 7, and the low beam posture is maintained. Thereby, a predetermined light distribution pattern LP for passing is obtained.

  That is, of the reflected light, the reflected light that travels to almost the upper half of the condenser lens 4 is blocked by the movable shades 10 and 11, while the reflected light that travels to the lower half of the condenser lens 4 is a low beam It is illuminated forward. For this reason, as shown in FIG. 8, a predetermined light distribution pattern LP for passing is obtained.

  Next, the solenoid 6 is energized. Then, the plunger 14 of the solenoid 6 retreats against the spring force of the spring member 7. Along with this, the movable shades 10 and 11 move down linearly, and switch from the low beam posture indicated by the solid line in FIGS. 6 and 7 to the high beam posture indicated by the two-dot chain line in FIGS. 6 and 7.

  As a result, the reflected light travels over the entire surface of the condenser lens 4 and is irradiated forward as a high beam. Therefore, as shown in FIG. 9, a predetermined light distribution pattern HP for traveling is obtained.

  Then, the power supply to the solenoid 6 is cut off. Then, the spring member 7 in the bent state shown by the two-dot chain line in FIGS. 6 and 7 elastically returns to the original state shown by the solid line in FIGS. 6 and 7. Along with this, the plunger 14 of the solenoid 6 moves forward. At the same time, the movable shades 10 and 11 rise linearly, and switch from the high beam posture indicated by the two-dot chain line in FIGS. 6 and 7 to the low beam posture indicated by the solid line in FIGS. 6 and 7. As a result, as shown in FIG. 8, a predetermined light distribution pattern LP for passing is obtained.

(Explanation of Effect of First Embodiment)
The headlamp 1 according to the first embodiment is configured as described above, and the effects thereof will be described below.

  In the headlamp 1 of the first embodiment, the length of the front movable shade 10 is shorter than the length of the rear movable shade 11 in the movable shades 10 and 11 having the two thin plate structures. The reflective surfaces 100 and 110 are provided on inner surfaces of the and the rear movable shade 11 facing each other. As a result, when the movable shades 10 and 11 are in the low beam posture, the headlamp 1 according to the first embodiment has a part of the reflected light from the reflector 3 as shown by a solid arrow in FIGS. 2 and 5. L enters a gap S between the movable shades 10 and 11 having two thin plate structures. Then, the light L passes through the gap S between the movable shades 10 and 11 while being reflected by the reflecting surfaces 100 and 110 of the movable shades 10 and 11 having the two thin plate structures. The light L1 (indicated by solid arrows) passing through the movable shades 10 and 11 is incident substantially on the lower part of the condenser lens 4, passes through the condenser lens 4, and is directed toward an overhead sign (not shown). The light is radiated in the light distribution pattern OP shown in FIG. As described above, the headlamp 1 in the first embodiment can reliably obtain the overhead sign irradiation light without significantly changing the design, configuration, structure, and the like of the shade.

  In particular, the headlamp 1 according to the first embodiment includes the front movable shade 10 at a position facing the lower end of the light guide reflection surface 100 of the front movable shade 10 in the output reflecting surface 110 of the rear movable shade 11. A bead 31 is provided as a light diffusing means projecting to the side. For this reason, the headlamp 1 according to the first embodiment diffuses the light L2 (indicated by the dashed arrow) by the bead 31 as the light diffusing means, so that the overhead sign has an appropriate illuminance and a wide range. Will be done. Moreover, in the headlamp 1 according to the first embodiment, the illuminance and irradiation range of the light irradiated on the overhead sign side can be adjusted by adjusting the location and number of the beads 31 as the light diffusing means. it can.

  The headlamp 1 in the first embodiment is located at a position facing the lower end of the front movable shade 10 of the rear movable shade 11, that is, at a position where the light L2 is reflected and output to the condenser lens 4 side. Since the bead 31 as the light diffusing means is provided, the light L2 reflected and output toward the condenser lens 4 can be surely and efficiently diffused.

  Further, the headlamp 1 in the first embodiment has the bead 31 as a light diffusing means at a position separated downward from the upper edge 13 of the rear movable shade 11, so that the distortion due to the bead 31 is provided. Has little effect on the upper edge 13 of the rear movable shade 11. This has no effect on the light distribution pattern LP for passing, which is light-shielded by the upper edge 13 of the rear movable shade 11.

  Furthermore, in the headlamp 1 according to the first embodiment, the strength of the rear movable shade 11 having the thin plate structure is improved by the bead 31, so that the strength of the front movable shade 10 having the two-piece structure is also improved, and the rear side is improved. Since the shapes of the movable shade 11 and the front movable shade 10 are reliably held, the light distribution pattern LP for passing by the deformation of the movable shades 10 and 11 is not affected, and the light distribution performance is improved.

  Furthermore, in the headlamp 1 according to the first embodiment, since the movable shades 10 and 11 have a two-plate structure, the weight of the movable shades 10 and 11 can be reduced. For this purpose, means for switching the movable shades 10 and 11, that is, the switching force between the solenoid 6 and the spring member 7 can be reduced, so that an inexpensive solenoid 6 and spring member 7 (switching hand) having a small switching force are used. And the manufacturing cost is reduced accordingly. Moreover, since the movable shades 10 and 11 are light in weight, the switching operation of the movable shades 10 and 11 can be easily and accurately performed by the switching means, so that the light distribution pattern can be compared with the light distribution pattern LP for passing. It is possible to accurately switch to the light distribution pattern HP for traveling.

(Description of examples other than Example 1)
In the first embodiment, the light diffusing means is constituted by a bead 31 provided on the rear movable shade 11 so as to protrude inward. However, in the present invention, a bead as a light diffusing means may be provided on the front movable shade 10, or may be provided on both the movable shades 10 and 11.

  In the first embodiment, the bead 31 is provided at a position facing the lower end of the front movable shade 10 of the rear movable shade 11. A bead 31 may be provided. In addition, in the first embodiment, the bead 31 is provided on the entire rear movable shade 11, but in the present invention, the bead 31 is provided on a part of the rear shade 11. There may be. Furthermore, although one bead 31 is provided, in the present invention, two or more beads 31 may be provided. In the above embodiment, the bead 31 is provided along the longitudinal direction of the rear movable shade 11, but in the present invention, the bead 31 may be provided along the short direction of the shade. Alternatively, they may be provided along an oblique direction.

  Further, in the first embodiment, the bead 31 is provided as the light diffusing means. However, in the present invention, a light diffusing means other than the bead 31 may be provided. As the light diffusing means, for example, a surface treatment such as sandblasting or etching is performed on inner surfaces of the two movable shades 10 and 11 facing each other, and the surface is roughened so that light is diffusely reflected. You may. In this case, the inner surface of at least one of the two movable shades 10 and 11 may be subjected to a surface treatment.

  Furthermore, in the first embodiment, the second focal point F2 is provided at approximately one half of the movable shades 10 and 11 having the two thin plate structures. In the present invention, the second focal point F2 is provided. F2 may be provided on the rear side (discharge lamp 2 side) from approximately one half of the movable shades 10 and 11. By adjusting the position of the second focal point F2, the amount of light L incident on the gap S between the movable shades 10 and 11 having the two thin plate structures can be adjusted.

  Furthermore, in the first embodiment, a two-lamp headlamp has been described, but in the present invention, a four-lamp headlamp may be used. That is, the shade may be a fixed shade instead of a movable shade, and the light distribution pattern may be a fixed shade.

  FIG. 10 is a side sectional view showing a shade of a headlamp according to the second embodiment of the present invention. In the figure, the same components as those of the headlamp 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the headlamp 1 according to the first embodiment, the rear shade 11 has a rib-shaped bead 31 (see FIG. 5), and this bead 31 diffuses light passing between the movable shades 10 and 11 to the overhead sign. The illuminance of the irradiation light was reduced. On the other hand, in the headlamp 1 of the second embodiment, the front shade 10 has the light amount reducing means 41 on the light guide reflection surface 100, and the light amount reducing means 41 controls the light passing between the movable shades 10 and 11. The feature is that the amount of light is reduced.

  The light amount reducing means 41 is formed on the light guide reflection surface 100 of the front shade 10. The light amount reducing unit 41 is configured by, for example, applying black, brown, gray, or other dark-based coloring to the light guide reflection surface 100 (the inner side surface of the front side shade 10). Here, the dark coloring refers to coloring that attenuates the amount of reflected light. Note that the light amount reducing unit 41 may be formed over the entire surface of the light guide reflection surface 100 or may be formed partially. In the second embodiment, the entire surface of the light guide reflection surface 100 is colored in a dark color.

  In such a configuration, the light amount reducing unit 41 attenuates the light reflected on the light guide reflection surface 100 to reduce the light amount of the light L1 passing between the movable shades 10 and 11. Thus, there is an advantage that the illuminance of the irradiation light on the overhead sign can be reduced. Specifically, the illuminance of the light distribution pattern OP irradiated toward the overhead sign in the light distribution patterns illustrated in FIG. 8 is smaller than that of the passing light distribution pattern LP.

  Further, in such a configuration, the illuminance of the irradiation light can be arbitrarily adjusted by selecting the color for the coloring of the light amount reducing unit 41. In particular, since it is easy to finely change the color involved in coloring in processing the front side shade 10, there is an advantage that the illuminance of light can be easily adjusted in minute units. Further, the configuration in which the illuminance of the irradiation light is adjusted by selecting the color is simpler than that in the case where the adjustment is performed by changing the shape of the bead 31 because the color is simply changed. The color of the light amount reducing means 41 can be appropriately selected within a range obvious to those skilled in the art according to the specifications of the headlamp 1 while referring to the reflectance of light of the color.

  In addition, such a configuration is preferable in that the illuminance of the irradiation light can be easily adjusted without changing the structure of the headlamp 1, particularly the structure of the spring member 7 for driving the movable shades 10 and 11. In addition, this configuration provides a configuration other than the bead 31 described in the first embodiment as a means for adjusting the illuminance of irradiation light, and is therefore preferable in terms of diversification of technology.

  In the headlamp 1 according to the second embodiment, the light amount reducing unit 41 is configured by applying a dark color to the light guide reflection surface 100 as described above, but is not limited thereto. A film layer may be formed on the light guide reflection surface 100 by vapor deposition or pasting. Thereby, there is an advantage that the same operation as the above-described configuration by coloring can be obtained.

  In the headlamp 1 according to the second embodiment, the light amount reducing unit 41 may be configured by reducing the surface roughness of the light guide reflection surface 100. As such a configuration, for example, there is a configuration in which a surface treatment such as sandblasting or etching is performed on the light guide reflection surface 100. Even with such a configuration, the reflectance of light on the light guide reflection surface 100 is reduced, so that the amount of light L1 passing between the movable shades 10 and 11 can be reduced, similarly to the configuration related to the above-described dark coloring. . Further, the surface roughness of the light guide reflection surface 100 can be adjusted in minute units in the surface treatment step. Thereby, there is an advantage that the illuminance of the light distribution pattern OP concerning the overhead sign can be arbitrarily adjusted according to the specifications of the headlamp 1.

  Further, in the headlamp 1 of the second embodiment, the light amount reducing means 41 is formed only on the front side shade 10, which is preferable in that the processing is easy. However, the present invention is not limited to this, and the light amount reducing means 41 may be formed on the output reflection surface 110 of the rear shade 11 (not shown). This configuration also has the advantage that the same effect as when the light amount reducing means 41 is formed on the front shade 10 can be obtained.

  Further, the light quantity reducing means 41 may be formed on both the front and rear movable shades 10 and 11 (not shown). That is, the light amount reducing means 41 may be formed on both the light guide reflection surface 100 of the front shade 10 and the output reflection surface 110 of the rear shade 11. With such a configuration, there is an advantage that the amount of light passing therethrough can be more effectively reduced by the action of both movable shades 10 and 11. In particular, in such a configuration, for example, the light passing between the movable shades 10 and 11 cannot be sufficiently secured because the vertical width of the front shade 10 (the width in the height direction of the headlamp 1) cannot be sufficiently secured due to the specifications of the headlamp 1. When the number of times of refraction is small, it is preferable that the irradiation light can be suitably reduced between the short movable shades 10 and 11.

  FIG. 11 is a side sectional view showing a shade of a headlamp according to the third embodiment of the present invention. In the figure, the same components as those of the headlamp 1 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the headlamp 1 of the first embodiment, the rear shade 11 has a rib-shaped bead 31 (see FIG. 5), and this bead 31 diffuses light passing between the movable shades 10 and 11, and illuminates the illumination light. The direction was toward the overhead sign. On the other hand, the headlamp 1 according to the third embodiment is characterized in that the rear side shade 11 has the irradiation direction regulating means 42 on the wall surface thereof, thereby directing the light irradiation direction in a predetermined direction. .

  The irradiation direction restricting means 42 is formed by cutting and raising a part of the rear side shade 11 toward the front side (the opposite front side shade 10 side), and its output reflecting surface 111 has an entrance side (head) between the movable shades 10 and 11. (Upper side of the lamp 1). The irradiation direction restricting means 42 has a substantially rectangular shape when viewed from the front of the headlamp 1 (see FIG. 1), and is located substantially at the center of the rear side shade 11 and in the left-right direction (headlight 1 in the left-right direction). The irradiation direction regulating means 42 is formed at a position substantially opposed to the lower end of the light guide reflection surface of the front shade 10. Specifically, the irradiation direction regulating means 42 is formed at substantially the same position as the position where the bead 31 described in the first embodiment is provided.

  In such a configuration, the irradiation direction restricting means 42 reflects the light L2 passing between the movable shades 10 and 11 on the output reflection surface 111 and restricts the irradiation direction to the direction of the overhead sign. Specifically, the irradiation direction of the light L2 is changed to be higher (toward the front shade 10) than the irradiation direction L1 when the wall surface of the rear shade 11 is flat. Then, the reflected light L2 is irradiated above (the VU side) the light distribution pattern LP for passing shown in FIG. 8, and a light distribution pattern OP for an overhead sign is drawn above the light distribution pattern LP. Thereby, there is an advantage that the light distribution patterns LP and OP for both the passing and the overhead sign can be formed. In particular, in such a configuration, the irradiation direction of light can be arbitrarily adjusted by selecting the cut-and-raising angle of the irradiation direction regulating means 42, so that the position adjustment of the light distribution patterns LP and OP is easy. Further, there is an advantage that the position and shape of the light distribution pattern OP can be freely formed by adjusting the formation position, the vertical width, and the horizontal width (that is, the dimensional width of the headlamp when viewed from the front) of the irradiation direction regulating means 42. .

  In addition, such a configuration is preferable in that a desired light distribution pattern OP can be formed without changing the structure of the headlamp 1, particularly the structure of the spring member 7 for driving the movable shades 10 and 11. In addition, since this configuration provides a configuration other than the bead 31 described in the first embodiment as a means for forming the light distribution pattern OP, it is preferable in terms of diversification of technology.

  In addition, in the headlamp 1 of the third embodiment, the irradiation direction regulating means 42 is formed by cutting and raising the wall surface of the rear side shade 11, which is preferable because no additional member is required. However, the present invention is not limited to this, and the irradiation direction regulating means 42 may be formed by a new member, which is provided on the wall surface of the rear shade 11 (not shown).

  Further, in the headlamp 1 of the third embodiment, the irradiation direction regulating means 42 has a substantially rectangular flat plate structure, and has a planar output reflecting surface 111. This is preferable in that the processing of the irradiation direction regulating means 42 is easy and the adjustment of the light irradiation direction and the irradiation range is easy. However, the present invention is not limited to this, and the shape and structure of the irradiation direction regulating means 42 can be arbitrarily changed within a range obvious to those skilled in the art.

  Further, the headlamp 1 of the third embodiment may be configured by a combination with the headlamp 1 of the second embodiment. For example, in FIG. 11, the light guide reflection surface 100 of the front side shade 31 may be colored in a dark color to form the light amount reducing means 41 (not shown). In such a configuration, the light amount of the light passing between the movable shades 10 and 11 is attenuated by the light amount reducing unit 41. Thus, there is an advantage that the illuminance of the irradiation light on the overhead sign can be reduced while taking advantage of the irradiation direction regulating means 42.

  Further, in the headlamp 1 of the third embodiment, the modification described in the second embodiment may be further applied to the irradiation direction regulating means 42. In other words, the irradiation direction regulating unit 42 itself may be subjected to dark coloration or surface treatment described in the second embodiment to constitute the light amount reducing unit 41 (not shown). Thereby, there is an advantage that the illuminance and irradiation range of the light irradiated on the overhead sign side can be publicly adjusted.

1 is a front view showing an embodiment of a headlamp according to the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 2. FIG. 4 is a view taken in the direction of the arrow IV in FIG. 1. It is an expanded sectional view of the V section in FIG. It is a side view which shows the shade and spring member of an integral structure. It is a front view which shows the shade and spring member of an integral structure. It is explanatory drawing which shows the light distribution pattern for passing. It is explanatory drawing which shows the light distribution pattern for driving | running | working. FIG. 6 is a side sectional view showing a shade of a headlamp according to a second embodiment of the present invention. FIG. 10 is a side sectional view showing a shade of a headlamp according to a third embodiment of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Headlamp 2 Discharge lamp 3 Reflector 4 Condensing lens 5 Shade 6 Solenoid 7 Spring member 8 Socket mechanism 9 Holder 10 Movable shade (forward movable shade)
100 Light guide reflective surface (reflective surface)
11 movable shade (backward movable shade)
110, 111 Output reflection surface (reflection surface)
12 Fixed shade 13 Edge part 14 Plunger (advancing rod)
Reference Signs List 15 mounting part 16 screw 17 fixing part 18 stopper part 19 shade part 20 screw 24 mounting part 25 mounting thin plate part 31 bead 32 caulking 41 light quantity reducing means 42 irradiation direction regulating means F1 first focus F2 second focus LP Light distribution for passing Pattern HP Light distribution pattern for traveling CL Cut line 0L Light distribution pattern for overhead sign S Gap L, L1, L2 Light Z Optical axis (line segment connecting edge parts)

Claims (6)

In a headlamp that irradiates part of the irradiation light to the overhead sign side,
A light source, a reflector that reflects light from the light source, a condenser lens that irradiates the reflected light from the reflector to a road surface, and the like, and a predetermined light distribution pattern that is disposed between the reflector and the condenser lens. And a shade of two thin plate structures forming
The two thin plate-shaped shades include a front shade on the condenser lens side and a rear shade on the reflector side,
The vertical length of the front shade is shorter than the vertical length of the rear shade,
Reflecting surfaces are respectively provided on inner surfaces of the front shade and the rear shade facing each other,
The reflection surface of the front shade is a part of the reflected light from the reflector, and is a light guide that reflects light incident between the front shade and the rear shade on the reflection surface of the rear shade. A light reflecting surface,
The reflection surface of the rear shade is an output reflection surface that reflects light from the light guide reflection surface of the front shade to the lower side of the condenser lens and irradiates the overhead sign side.
A headlamp characterized in that:   2. The headlamp according to claim 1, wherein at least one of the light guide reflection surface of the front shade and the output reflection surface of the rear shade is provided with a light diffusing unit. .   The light diffusing means is a bead that projects toward the front shade side at a position facing the lower end of the light guide reflection surface of the front shade, of the output reflection surface of the rear shade. The headlamp according to claim 2, wherein   The shade is a two-light type that is obtained by switching a posture of the shade to switch a light distribution pattern for a predetermined passing light and a light distribution pattern for a predetermined traveling with one light source. The headlamp according to any one of claims 1 to 3, wherein the headlamp is a movable shade.   At least one of the light guide reflection surface of the front shade and the output reflection surface of the rear shade is provided with a light amount reducing unit that reduces the light amount of light passing through the shade. The headlamp according to any one of claims 1 to 4, characterized in that:   6. The rear side shade is provided with irradiation direction regulating means for regulating an irradiation direction of light passing through the shade to a direction toward an overhead sign. Headlamp described in section.

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