JPH051102U - Vehicle headlights - Google Patents

Abstract

(57) [Summary] [Object] To provide a vehicle headlamp that can obtain a desired light distribution pattern for traveling and a light distribution pattern for passing each other with one lamp unit equipped with one light source. A discharge mechanism (one light source) movably attached to a reflector 1 and a shade 4 are equipped with a moving mechanism 5 (or a light source moving mechanism 6 and a shade moving mechanism 7). As a result, the moving mechanism 5 is operated, and the discharge lamp 2
When the shade 4 is moved to the vicinity of the focus F and the shade 4 is moved to a position where the light from the discharge lamp 2 is not blocked, a traveling light distribution pattern is obtained. In addition, the discharge lamp 2 at other positions,
When the shade 4 is moved to a position where the light from the discharge lamp 2 is blocked, a light distribution pattern for passing is obtained. Therefore, the desired light distribution pattern for traveling and the desired light distribution pattern for passing can be obtained with one lamp unit equipped with one light source.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle headlamp equipped with one light source, and in particular, one lamp unit equipped with one light source provides a desired light distribution pattern for traveling and a light distribution pattern for passing each other. The present invention relates to a vehicle headlight.

[0002]

[Prior Art]

 A vehicle headlamp equipped with one light source has one light source arranged in a lamp chamber defined by a lens and a reflector (and a housing). Such a vehicle headlamp consisting of one light source is used for a traveling lamp unit that obtains a traveling light distribution pattern that illuminates the front as shown in FIG. 7 and an oncoming vehicle as shown in FIG. One set is provided on each of the left and right sides of the front of the vehicle, with one set of a passing lamp unit that provides a passing light distribution pattern that has a cut line so as not to give glare light. Then, when the light source of the passing lamp unit is turned on by operating the switch, the light distribution pattern for passing is obtained, and when the light source of the running lamp unit is turned on, a light distribution pattern for traveling is obtained. ..

[0003]

[Problems to be solved by the device]

 However, in the above-described conventional vehicle headlamp, one light source is arranged in one lamp unit, so that one lamp unit can obtain only one light distribution pattern. Therefore, in order to obtain the light distribution pattern for traveling and the light distribution pattern for passing, there is a problem that it is necessary to provide a traveling lamp unit and a passing lamp unit, respectively.

An object of the present invention is to provide a vehicle headlamp that can obtain a desired traveling light distribution pattern and a passing light distribution pattern with one lamp unit equipped with one light source. Especially.

[0005]

[Means for Solving the Problems]

 According to the present invention, a light source is held in a holder, and the holder is movably attached to a reflector, while a shade is movably attached to the reflector, the holder is equipped with a light source moving mechanism, and the light source is attached via the holder. The shade is equipped with a shade moving mechanism interlocking with the light source moving mechanism, and the shade is moved by the light source to a focal point. When the light source is located near the point, the light distribution pattern for traveling is obtained without blocking the light from the light source, and when the light source is located at other positions, the light from the light source is blocked and the light passes. It is characterized in that it is configured so as to reciprocate between a position where a light distribution pattern for light is obtained.

[0006]

[Action]

 According to the present invention, the light source moving mechanism and the shade moving mechanism are interlocked with each other to move the light source near the focus and the shade to a position where the light from the light source is not blocked. The pattern is obtained. If the light source is moved to another position and the shade is moved to a position that blocks the light from the light source, a light distribution pattern for passing light can be obtained. In this way, with one lamp unit equipped with one light source, a desired traveling light distribution pattern and a desired light distribution pattern for passing light can be obtained.

[0007]

【Example】

 Hereinafter, two examples of the vehicle headlamp according to the present invention will be described with reference to the accompanying drawings. 1 to 8 show a first embodiment of a vehicle headlamp according to the present invention. In the figure, 1 is a reflector. The reflector 1 is open on the front side and closed on the rear side. A lens (not shown) is arranged on the front opening side of the reflector 1, an insertion hole 10 for inserting a light source is provided at the center of the rear part, and a paraboloid of revolution is formed on the front side (inner surface side) of the rear part. A reflective surface 11 is provided. This reflector 1 reflects light from a discharge lamp 2 described later on a front lens side by a reflecting surface 11. In the drawing, 12 is a bracket having a substantially L-shaped cross section. The bracket 12 is fixed to the side wall of the bottom surface of the reflector 1 with a screw 16 or the like, and a space is opened on the rear side of the reflector 1 so as to be positioned. An elongated hole 13 is provided in the horizontal plate portion of the bracket 12 and the side wall of the bottom surface of the reflector 1 in the optical axis Z-Z direction described later. One end of a plurality of guide pins 14 is caulked and fixed to the vertical plate portion of the bracket 12, and the other end of the guide pins 14 is directed to the reflector 1 side. Through holes 15 are provided in the vertical plate portion of the bracket 12 in parallel with the direction in which the guide pins 14 are planted. In the figure, F is the focal point of the reflecting surface 11 of the reflector 1, and ZZ is the rotation axis of the reflecting surface 11 of the reflector 1, that is, the optical axis.

In the figure, 2 is one light source, which is a discharge lamp in this example. The discharge lamp 2 includes an outer tube 21 having an arc tube 20, a base 22 provided at the rear portion of the outer tube 21, and a lead wire 23 drawn from the base 22.

In the figure, 3 is a holder. As shown in FIG. 1, the holder 3 has a substantially L-shaped cross section, a cylindrical light source holding portion 30 is provided at one end, a guide hole 31 is provided at the other end, and an advancing / retreating convex portion 32 is provided. The projection is integrally formed in parallel with the direction of the guide hole 31. The base 22 of the discharge lamp 2 is inserted into the holder 30 of the holder 3 and fixed by the screw 33. The guide pin 14 of the bracket 12 is passed through the guide hole 31 of the holder 3, and the forward / backward protruding portion 32 of the holder 3 is inserted into the through hole 15 of the bracket 12 so as to be forward / backward. As a result, one light source discharge lamp 2 is movably attached to the bracket 12 or the reflector 1 via the holder 3 in the protruding direction of the guide pin 14 and the advancing / retreating convex portion 32. .. A stopper 34 such as an E ring is fixed to the other end of the guide pin 14 to prevent the holder 3 from coming off the guide pin 14. Further, a stopper 35 is provided or fixed at the tip of the forward / backward protruding portion 32 of the holder 3, and a compression spring 36 is interposed between the stopper 35 and the bracket 12.

In the figure, 4 is a shade. The shade 4 has a semi-cylindrical shape (in FIG. 3, the left side edge is located below the horizontal line), and a leg portion 40 is provided so as to project from the lower surface in the center. 41 is a pair of guide rails. The guide rails 41 are fixed to both side edges of the elongated holes 13 of the reflector 1 and the bracket 12 along the elongated holes 13 by screws 42 or the like. 43 is a base. The base 43 slidably engages between the pair of guide rails 41 in the elongated hole 13 direction, and allows the lower portion 45 to pass through the elongated hole 13. The leg portion 40 of the shade 4 is fixed to the upper surface of the base 43 with a screw 44 or the like. As a result, the shade 4 is movably attached to the reflector 1 and the bracket 12 via the base 43 and the guide rail 41 in the direction of the elongated hole 13. In the figure, reference numeral 5 is a moving mechanism that also serves as a light source moving mechanism and a shade moving mechanism. The moving mechanism 5 includes a motor 51 and a gear box 52 mounted on the bracket 12 by a screw 50, a cam 54 and a gear 55 fixed to an output shaft 53 of the gear box 52 concentrically, and a gear 55 thereof. And a rack 56 that meshes with. The cam 54 is brought into contact with the tip end surface of the advancing / retreating convex portion 32 of the bracket 12, while the rack 56 is attached to the lower surface of the base 43 of the shade 4 in the direction of the guide rail 41 and the slot 13 by a screw 57 or the like. Fix it. The vehicle headlamp of the present invention in this embodiment has the above-mentioned structure, and its operation will be described below. First, the state shown in FIG. 1, that is, the arc tube 20 (light source) of the discharge lamp 2 is located forward (on the lens side) from the focal point F of the reflector 1 and at a position separated upward, and the shade 4 is located in the discharge lamp 2. The discharge lamp 2 is lit in a state in which it is positioned directly below the discharge lamp 2 so as to block light from the lower half of the discharge lamp 2. Then, as shown in FIG. 6, the light from the lower half of the discharge lamp 2 is blocked by the shade 4, but the light from the upper half of the discharge lamp 2 is reflected by the reflecting surface 11 of the reflector 1 along the optical axis Z-Z. The light distribution pattern for passing light as shown in FIG. 8 is obtained through the lens. Next, the motor 51 is driven from the above state to simultaneously rotate the cam 54 and the gear 55 in the arrow direction (clockwise direction) in FIG. Then, the outer diameter of the cam 54 is gradually reduced, and accordingly the advancing / retreating convex portion 32 is moved rightward by the elastic force of the spring 36, and the holder 3 is moved rightward along the guide pin 14. As a result, the arc tube 20 (light source) of the discharge lamp 2 is located near the focal point F of the reflector 1 via the holder 32, as shown in FIG. Further, the rack 56 that meshes with the gear 55 moves to the left, and the base 43 accordingly moves to the left along the guide rail 41 and the elongated hole 13. As a result, as shown in FIG. 2, the shade 4 moves from directly below the discharge lamp 2 to the left side through the base 43 and is located at a position where the light from the lower half of the discharge lamp 2 is not blocked. In this state, the discharge lamp 2 is turned on. Then, as shown in FIG. 5, the light from the discharge lamp 2 is reflected by the reflecting surface 11 of the reflector 1 substantially parallel to the optical axis Z--Z, and passes through the lens to set the traveling arrangement as shown in FIG. A light pattern is obtained. Then, the motor 51 is driven from the above state to rotate the cam 54 and the gear 55 in the counterclockwise direction in FIG. Then, the outer diameter of the cam 54 gradually increases, and accordingly the advancing / retreating convex portion 32 moves to the left side against the elastic force of the spring 36, and the holder 3 moves to the left side along the guide pin 14. As a result, as shown in FIG. 1, the arc tube 20 (light source) of the discharge lamp 2 is positioned via the holder 32 at a position apart from the focal point F of the reflector 1 in the front and above. Further, the rack 56 that meshes with the gear 55 moves to the right, and accordingly the base 43 moves to the right along the guide rail 41 and the slot 13. As a result, as shown in FIG. 1, the shade 4 moves from the left side of the discharge lamp 2 to a position right below the discharge lamp 2 and is located at a position to block light from the lower half of the discharge lamp 2. In this way, with one lamp unit equipped with the discharge lamp 2 as one light source, a desired traveling light distribution pattern and a desired light distribution pattern for passing light can be obtained.

9 to 11 show a second embodiment of the vehicle headlamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 8 indicate the same parts. In the figure, 6 is a light source moving mechanism. The light source moving mechanism 6 includes an air cylinder 60, a wire 61 having one end fixed to the piston rod of the air cylinder 60 and the other end inserted into the bracket 12 and fixed to the holder 3, and the wire 61 inserted therein. And a wire guide 62 having one end fixed to the air cylinder 60 and the other end fixed to the bracket 12. In the figure, 7 is a shade moving mechanism. The shade moving mechanism 7 includes an air cylinder 70, a wire 71 having one end fixed to a piston rod of the air cylinder 70 and the other end fixed to a base 43, and the wire 71 inserted through the wire 71. The wire guide 72 is fixed to 70 and the other end is fixed to the base 43.

The vehicle headlamp according to the present invention in this embodiment has the above-mentioned structure, and its operation will be described below. First, the state shown in FIG. 9, that is, the arc tube 20 (light source) of the discharge lamp 2 is located forward (on the lens side) from the focal point F of the reflector 1 and at a position separated upward, and the shade 4 is located in the discharge lamp 2. A light distribution pattern for passing light is obtained in a state in which it is positioned directly below the discharge lamp 2 so as to block light from substantially the lower half of the above. From this state, the air cylinder 60 of the optical axis moving mechanism 6 and the air cylinder 70 of the shade moving mechanism 7 are interlocked and retracted. Then, the holder 3 moves to the right along the guide pin 14. As a result, the arc tube 20 (light source) of the discharge lamp 2 is located near the focal point F of the reflector 1 via the holder 32, as shown in FIG. Further, the base 43 moves to the left along the guide rail 41. As a result, as shown in FIG. 10, the shade 4 moves from right under the discharge lamp 2 to the left side through the base 43 and is positioned at a position where the light from the lower half of the discharge lamp 2 is not blocked. In this state, a light distribution pattern for traveling can be obtained. Then, from the above-described state, the air cylinder 60 of the optical axis moving mechanism 6 and the air cylinder 70 of the shade moving mechanism 7 are interlocked and moved forward. Then, the holder 3 moves to the left along the guide pin 14. As a result, the arc tube 20 (light source) of the discharge lamp 2 is located at a position apart from the focal point F of the reflector 1 forward and upward via the holder 32, as shown in FIG. Further, the base 43 moves to the right along the guide rail 41. As a result, as shown in FIG. 9, the shade 4 moves from the left side of the discharge lamp 2 to a position right below the discharge lamp 2 and is located at a position where the light from the lower half of the discharge lamp 2 is blocked. This embodiment can achieve the same effects as those of the first embodiment described above.

Although the discharge lamp 2 is described as one light source in the above-described embodiments, a light source other than the discharge lamp, for example, an incandescent lamp may be used.

[0014]

[Effect of the device]

 As is apparent from the above, the vehicle headlamp of the present invention is provided with the light source moving mechanism and the shade moving mechanism in the single light source and the shade movably attached to the reflector. When the light source moving mechanism and the shade moving mechanism are linked to move the light source near the focal point and the shade to positions where the light from the light source is not blocked, a light distribution pattern for traveling is obtained. Be done. If the light source is moved to another position and the shade is moved to a position that blocks light from the light source, a light distribution pattern for passing is obtained. Therefore, with one lamp unit equipped with one light source, a desired traveling light distribution pattern and a desired light distribution pattern for passing light can be obtained.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a vehicle headlamp according to the present invention,
FIG. 4 is a vertical cross-sectional view of a main part showing a state in which a light distribution pattern for passing each other can be irradiated.

FIG. 2 is a vertical cross-sectional view of a main part showing a state in which a light distribution pattern for traveling can be irradiated.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is an explanatory view showing an outline of one light source and a reflector, which shows an irradiation state of a light distribution pattern for traveling.

FIG. 6 is an explanatory view showing an outline of one light source, a reflector, and a shade, which shows an irradiation state of a light distribution pattern for passing each other.

FIG. 7 is an explanatory diagram of a light distribution pattern for traveling.

FIG. 8 is an explanatory diagram of a light distribution pattern for passing each other.

FIG. 9 shows a second embodiment of the vehicle headlamp of the present invention,
FIG. 4 is a vertical cross-sectional view of a main part showing a state in which a light distribution pattern for passing each other can be irradiated.

FIG. 10 is a vertical cross-sectional view of a main part showing a state in which a traveling light distribution pattern can be irradiated.

11 is a view on arrow IX in FIG.

[Explanation of symbols]

 1 reflector 2 discharge lamp (one light source) 3 holder 4 shade 5 moving mechanism 6 light source moving mechanism 7 shade moving mechanism

Claims (1)

Claims for utility model registration 1. A lens, one light source, a reflector for reflecting light from the one light source to the lens side, holding the light source, and movable to the reflector. A holder attached to the reflector, a shade movably attached to the reflector, and a light source that is mounted on the holder and moves the light source back and forth between the vicinity of the focal point of the reflector and other points through the holder. A mechanism and the shade, and the shade is interlocked with the light source moving mechanism so that a light distribution pattern for traveling can be obtained without blocking the light from the light source when the light source is located near the focus. And a shade moving mechanism that reciprocates between the position where the light distribution pattern for passing is obtained by blocking the light from the light source when the light source is located at another position, Vehicle headlamp, characterized in that it includes.