JPH0992005A - Automotive headlamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the visibility of the main beam of a headlamp by moving a shade at a position where it encompasses a light-source bulb placed ahead of a reflector, thereby tilting the reflector. SOLUTION: A light source unit 20 provided in the interior of a lamp body 10 is adjusted as it is tilted by an aiming mechanism. A shade 31 is provided in a position where it surrounds the discharge part 27 of the light source unit 20, so that light emitted from the discharge part 27 is guided to a predetermined area of the effective reflecting surface of a reflector 21. The shade 31 moves along an optical axis L to switch beam distribution between that for a main beam and that for a low beam. When the shade 31 comes to a front position, the light emitted from the discharge part 27 is guided to both first and second reflecting surfaces 22a, 22b. At the same time, the leveling mechanism of a reflector tilting mechanism is driven to tilt the reflector 21 to hold the optical axis L of the reflector 21 titled forward and upward by a predetermined angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlamp using a discharge bulb as a light source, and in particular, by moving a shade for forming a sub-beam, a part of light traveling from a discharge part, which is a light emitting source, to a reflector. The present invention relates to an automobile headlamp capable of forming both a main beam and a sub beam by cutting.

[0002]

2. Description of the Related Art A conventional lamp of this type is shown in FIG.
As shown in FIG. 11, by moving the shade 4 along the optical axis L with respect to the light source bulb 3 inserted in the bulb insertion hole 2 of the reflector 1, it is possible to form a traveling beam and a low beam. Has become. That is, in the state where the light of the light source bulb 3 is guided to the entire effective reflection surfaces 1a and 1b of the reflector 1 (the shade 4 at this time is in the position shown by the solid line in FIG. 10), as shown in FIG. 1a
A traveling beam having a light distribution pattern in which the pattern P ₁ formed by the reflection surface 1b and the pattern P ₂ formed by the reflection surface 1b are combined is formed, and the shade 4 is moved rearward along the optical axis L to generate the light source. By blocking the light traveling from the bulb 3 to the reflecting surface 1b and directing the light of the bulb 3 only to the reflecting surface 1a (the shade 4 at this time is in the position shown by the phantom line in FIG. 10), The traveling beam having the light distribution pattern shown can be switched to the passing beam having the light distribution pattern shown in FIG. Reference numeral 4a is a rearward extending portion for forming a clear cut line formed on the shade 4, and reference numeral 5 is an actuator for moving the shade 4. Known techniques for a lamp having this kind of structure include Japanese Utility Model Publication No. 7-6562 and Japanese Utility Model Publication No. 7-3.
No. 1447 is known.

As shown in FIG. 12, the light distribution pattern for the passing beam illuminates a region below the horizontal line H to the left and right so that glare is not emitted to an oncoming vehicle and the visibility in the vicinity of the vehicle is high. While the pattern P ₁ is suitable for increasing the light intensity, the light distribution pattern for the traveling beam is as shown in FIG.
As shown in, the light distribution pattern P for the low beam
₁ , illuminate the horizontal center of the horizontal line H intensively,
Spot-shaped pattern P suitable for enhancing visibility at a distance
₂ is a light distribution pattern obtained by combining the. Note that H ₁ and H ₂ in FIGS. 12 and 13 indicate hot zones in the patterns P ₁ and P ₂ .

[0004]

However, the conventional light distribution pattern for the traveling beam is a spot-like pattern for enhancing the visibility in the distance to the passing beam pattern P ₁ which sufficiently illuminates the vehicle vicinity area. Since the pattern P ₂ of No. ₂ is simply a combination and the change in the light distribution pattern between the passing beam and the traveling beam is small, the visibility of the distant region in the traveling beam may not be sufficient. That is,
When the light distribution is switched from the passing beam to the traveling beam, there is a problem that the illuminated distant area is relatively dark because the vehicle vicinity area (indicated by symbol A ₁ in FIG. 13) is too bright. .

[0005] Note that by, for example to adjust the shape of the effective reflecting surface 1b of the reflector for forming the pattern P _2, by moving the entire pattern P ₂ above, it is possible to enhance the distant visibility But hot zones H ₁ and H ₂
Are greatly separated in the vertical direction, and the visibility in the area near the horizontal line H deteriorates, which is not preferable. The present invention has been made in view of the above-mentioned problems, and an object thereof is to improve the visibility of a traveling beam in an automobile headlamp in which a shade is moved to switch light distribution between a passing beam and a traveling beam. It is in.

[0006]

In order to achieve the above object, in a vehicle headlamp according to a first aspect of the present invention, a reflective surface for forming a passing / running beam and a reflective surface for forming a running beam are formed. A container-shaped reflector, a light source valve arranged at a predetermined position in front of the reflector, and a shade provided at a predetermined position surrounding the light source valve for switching the light distribution between passing light and traveling light. A shade drive mechanism that moves along
A reflector tilting mechanism that tilts the optical axis of the reflector in the vertical direction in association with the shade driving mechanism is provided. According to a second aspect of the present invention, in the vehicle headlamp according to the first aspect, the reflecting surface for passing and forming the traveling beam of the reflector is formed at a position surrounding the valve insertion hole formed in the reflector, while the traveling beam is formed. A reflective surface for forming is formed near the front opening edge of the reflector, and when the shade is moved forward, the light from the light source bulb is not blocked by the shade and the reflective surface for forming the traveling beam and passing / running The light is guided to the reflecting surface for beam forming, but when the shade is moved rearward, the light from the light source bulb toward the reflecting surface for forming the traveling beam is blocked by the shade. According to a third aspect of the present invention, in the vehicle headlamp according to the first aspect, a reflecting surface for passing the reflector and forming a traveling beam is formed in an upper region of a valve insertion hole formed in the reflector, while the traveling beam is formed. The reflection surface for forming is formed in the region below the bulb insertion hole or in the region from the bottom side of the bulb insertion hole to the front opening edge of the reflector that sandwiches the reflection / travel beam forming reflection surface on the left and right. When the shade moves forward, the light from the light source bulb is guided to the traveling beam forming reflective surface and the passing / traveling beam forming reflective surface without being blocked by the shade, but the shade moves rearward. At that time, the light from the light source bulb toward the reflecting surface for forming the traveling beam is shielded by the shade. According to a fourth aspect of the present invention, in the automobile headlamp according to the second or third aspect, the reflector tilting mechanism tilts the reflector forward and upward when the shade moves forward and moves the reflector when the shade moves rearward. It is configured to tilt forward and downward. According to a fifth aspect of the present invention, in the vehicle headlamp according to the first aspect, the headlamp is provided with a leveling mechanism that tilts and adjusts the optical axis of the reflector in the up-down direction according to the weight of the vehicle loaded. The mechanism is configured to also serve as the reflector tilting mechanism. According to a sixth aspect of the present invention, in the automobile headlamp according to the first aspect, the light source bulb is constituted by a discharge bulb that emits light by a discharge between electrodes opposite to each other in the closed glass sphere. According to a seventh aspect of the present invention, there is provided the automobile headlamp according to the first aspect, wherein the headlamp has a reflector movable type in which a reflector having a light source bulb inserted therein is tiltably supported by a tilting mechanism with respect to a lamp body, or a lens or a reflector. The lamp body, which is integrated with the light source bulb, is a unit movable type in which the lamp body is tiltably supported with respect to the lamp housing. Next, the operation of the present invention will be described. By moving the shade along the optical axis by the shade drive mechanism, the light of the light source bulb is guided to both the passing surface of the reflector and the reflecting surface for forming the traveling beam and the reflecting surface for forming the traveling beam to form the traveling beam. And the shade blocks the light that is guided to the reflective surface for forming the traveling beam of the reflector, and the light of the light source bulb is guided only to the reflective surface for forming the traveling beam.
It switches to a form in which a passing beam is formed. The movement of the shade by the shade drive mechanism and the tilting of the reflector by the reflector tilting mechanism are linked to each other, and when forming the passing beam, the reflector tilts forward and downward, and the reflecting surface for forming the passing / running beam causes it to arrive near the vehicle from the horizontal position. The area is illuminated widely. On the other hand, at the time of forming the traveling beam, the reflector tilts upward and forward, and the entire light distribution pattern formed by the reflecting surface for forming the passing beam and the traveling beam moves upward, so that the illumination area at the time of forming the passing beam is farther away. The area is illuminated. That is, the brightness in the vehicle vicinity area when forming the traveling beam is reduced as compared with the vehicle vicinity area when the passing beam is formed, and when the light distribution is switched from the passing beam to the traveling beam, the distance is relatively bright. It is felt and the distant visibility in the running beam is improved.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 8 show a first embodiment of the present invention. FIG. 1 is a front view of a two-lamp type automobile headlamp, and FIG. 2 is a vertical sectional view of the same headlamp (line II shown in FIG. 1). -II), FIG. 3 is a vertical cross-sectional view of the same headlamp (cross-sectional view taken along line III-III shown in FIG. 1), FIG.
Is a front view of a reflector with a shade drive mechanism installed,
FIG. 5 is a horizontal sectional view of the same reflector (line V- shown in FIG. 4).
FIG. 6 is a view showing a light distribution pattern (a pattern that is not diffused by the front lens) created by the reflector, FIG. 7 is a view showing a light distribution pattern of a low beam of the headlamp, and FIG. 8 is a view showing the same. It is a figure which shows the light distribution pattern of the traveling beam of a headlamp.

In these figures, reference numeral 10 is a container-shaped lamp body made of synthetic resin, which is open to the front, and a front lens 12 is attached to the front opening of the lamp body 10 to form a lamp chamber S. A reflective light source unit 20 for forming a low beam and a traveling beam is provided inside the lamp body 10, that is, in the lamp chamber S. The light source unit 20 includes a rear wall of the lamp body 10 and a light source unit 20.
The tilting can be adjusted by an aiming mechanism, which will be described later and is interposed therebetween.

In the reflection type light source unit 20, a discharge bulb 26 is inserted into a bulb insertion hole 22 provided at a rear top portion of a container-shaped reflector 21, and a shade 31 is provided at a position surrounding a discharge portion 27 of the bulb 26. In the structure in which the reflector 21 is provided, the light emitted from the discharge part 27 arranged at a predetermined position in front of the reflector 21 is guided by the shade 31 only to a predetermined area of the effective reflection surface of the reflector 21, and the predetermined effective reflection surface 22 of the reflector 21 is provided. The light reflected by is diffused to the left and right by a light distribution control step (diffusion step) 12a formed on the back surface of the front lens 12 to form a predetermined light distribution.

As shown in FIG. 4, the effective reflection surface 22 includes a first reflection surface 22a for forming a passing beam and a traveling beam formed around the valve insertion hole 21a, and the first reflection surface 22a. The second reflection surface 22b for forming a traveling beam is formed on the outer side in the left-right direction near the left and right opening edges of the reflector 21. First reflective surface 22
6A is a paraboloid of revolution (Y ² + Z ² = 4Fx) forming a substantially semicircular light distribution pattern PA ₁ having a clear clear cut line along the horizontal line H, as shown in FIG. 6A. As shown in FIG. 6B, the shape of the reflecting surface area 22a ₁
A general parabolic surface (Y ² / Fy + Z ² / that forms a substantially rectangular light distribution pattern PA ₂ near the horizontal line on the left side of the vertical line V.
Fz = 4X) shaped reflecting surface region 22a ₂ and FIG.
As shown in, a general parabolic surface (Y ² / Y ² ) forming a substantially fan-shaped light distribution pattern PA ₃ on the right side of the vertical line V and below the horizontal line.
Fg + Z ² / Fz = 4X) shaped reflecting surface area 22a ₃ and the second reflecting surface 22b is located on the horizontal line H and in the central portion in the vertical direction, as shown in FIG. 6D. A paraboloid of revolution (Y that forms a ribbon-shaped light distribution pattern PB
² + Z ² = 4FX).

The first reflecting surface 22a (22a ₁ , 2a)
The light reflected by 2a ₂ , 22a ₃ ) is diffused to the left and right by the light distribution control step (diffusion step) 12a of the front lens 12 to clear the light obliquely to the left by 15 degrees, as indicated by the symbol Pa in FIG. A light distribution pattern that has a cut line and spreads greatly to the left and right is formed. In addition, the second reflecting surface 22
Since the light reflected by b is diffused by the light distribution control step (diffusion step) 12a of the front lens 12, FIG.
As indicated by reference sign Pb, a light distribution pattern that is substantially circular and spreads small is formed. Reference symbols Ha and Hb represent hot zones of the patterns Pa and Pb. As shown in FIG. 7, effective reflection is performed so that both hot zones Ha and Hb are slightly below the horizontal line and substantially coincide with each other in the left-right direction. Face 22
The shapes of the (first and second reflecting surfaces 22a, 22b) are set.

Further, the shade 31 is formed in a cylindrical shape having a closed front end so that the direct light of the bulb 26 is not emitted forward and becomes glare light, and the shade drive provided on the bottom wall of the reflector 21 is driven. It is supported by a ball screw slide unit 30, which is a mechanism. Code M
Reference numeral ₁ is a motor for rotating the ball screw 33, reference numeral 34 is a slider assembled to the ball screw 33 extending in the front-rear direction, and reference numeral 35 is a leg portion of the shade 31 on the bottom wall of the reflector 21. It penetrates through the formed groove 32 and is fixed to the slider 34.

The shade driving mechanism 30 drives the shade 31 to move along the optical axis L, and when the shade 31 reaches the rear position as shown by the solid line in FIGS. The light Lb traveling toward the second reflection surface 22b is blocked by the shade 31, and the light emitted from the discharge unit 27 is emitted from the first reflection surface 22 as indicated by reference numeral La.
Similar to the conventional light distribution pattern (see FIG. 12) in which the light is reflected only by a and has a clear cut line near the horizontal line H and widely illuminates the left and right below the horizontal line H as shown by reference numeral Pa in FIG. A passing beam having a light distribution pattern of is formed.

On the other hand, as shown by the phantom lines in FIGS. 2 and 5, when the shade 31 comes to the front position, the discharge portion 27
Is emitted from the first reflection surface 22a and the second reflection surface 22b.
Be guided by both sides. At the same time, a leveling mechanism 70, which is also a reflector tilting mechanism described later, drives to tilt the reflector 21, and the optical axis L of the reflector 21 is tilted upward by a predetermined angle θ. For this reason,
The light distribution patterns Pa ′, P ′, obtained by moving the light distribution patterns indicated by reference signs Pa and Pb in FIG. 8 upward by a predetermined angle θ by the lights La and Lb reflected by the first reflecting surface 22a and the second reflecting surface 22b, respectively. A running beam having a combined pattern of Pb 'is formed. At this time, the pattern P
The hot zones Ha ′ and Hb ′ of a ′ and Pb ′ are respectively located on the horizontal line H, and are substantially coincident with each other in the substantially central portion in the left-right direction. Therefore, in this traveling beam, the pattern Pa ′ is slightly smaller than the pattern Pa (P ₁ ) by (θ) as compared with the conventional traveling beam having the light distribution pattern in which the patterns P ₁ and P ₂ are combined (see FIG. 13). The illuminance in the vehicle vicinity area A ₁ is lower than that in the case of the passing beam by the amount of movement to the upper side, and the hot zones Ha ′ and Hb ′ are substantially coincident with each other near the horizontal line H. The illuminated area looks relatively bright and has good visibility in the distance.

As shown in FIGS. 1 and 3, the light source unit 20 rotates on one fixed swing fulcrum A of a ball joint structure composed of a ball portion 14 and a ball receiver 15 and a rear wall of the lamp body 10. Two aiming screws 16 and 18 which are supported so as to extend forward and two nut members 17 and 19 which are screwed to the aiming screws 16 and 18 and are supported on the back surface of the reflector 21. By the aiming mechanism composed of the moving fulcrums B and C,
A tilt axis Lxy passing through the fixed swing fulcrum A and the moving fulcrum C, a vertical axis Ly passing through the fixed swing fulcrum A and the moving fulcrum B, and a horizontal axis Lx passing through the moving fulcrum B and the moving fulcrum C can be respectively tilted. Supported and aiming screws 16,1
By rotating 8 the light emitting direction is changed to the tilt axis Lx.
The tilt is adjustable around y and the vertical axis Ly.

A gear 16a is pivotally attached to the rear portion of the rear wall of the lamp body of the aiming screw 16, and an operating shaft 16b is provided along the lower wall of the lamp body 10 so as to extend substantially parallel to the aiming screw 16. In addition, a gear 16c that meshes with the gear 16a on the aiming screw 16 side is mounted on the rear end of the operation shaft 16b. Then, by rotating the operation shaft 16b by the driver D extending from the front of the headlamp, the aiming screw 16 is rotated, whereby the optical axis of the light source unit 20 can be tilted about the tilt axis Lxy.

The aiming screw 18 for adjusting the up / down and left / right directions and the nut 19 screwed on the screw 18 which constitute the moving fulcrum C have the same structure as the moving fulcrum B, and the operating shaft 18b is arranged in parallel with the aiming screw 18. At the same time, the operating shaft 18b and the aiming screw 18 are linked by a gear mechanism (not shown), and the operating shaft 18b is rotated to rotate the aiming screw 18, and thereby the optical axis of the light source unit 20. Can be tilted in the left-right direction (around the vertical axis Ly).

Reference numeral 70 in FIG. 3 is a leveling mechanism for holding the optical axes of the reflection type light source unit 20 in parallel. For example, there is a correlation between the load weight, the acceleration, the gradient, etc. and the optical axis of the headlamp, such that the optical axis of the headlamp is directed upward when the vehicle has a large loaded weight, when the vehicle is accelerating, or when the road is climbing uphill. Since it is known in advance, the leveling mechanism 70 is operated according to the amount of tilt in the vertical direction of the vehicle due to the loaded weight, the acceleration / deceleration state, the inclination of the road, the unevenness of the road surface, etc.
In this way, the optical axis L of the automobile can always be kept parallel.

That is, reference numeral 71 is a unit case having a built-in leveling mechanism 70, which is fixed to the back wall of the lamp body 10. Reference numeral 72 denotes a rod having a ball portion 14 which is a part of the fixed swing fulcrum A at the front end thereof, which penetrates the back wall of the lamp body in the front-rear direction and is prevented from rotating with respect to the case 71 and slides in the front-rear direction. It is supported so that it can move. Reference numeral 73 denotes a wheel 73a that is arranged coaxially with the rod 72 and is rotatably supported by the case 71.
Female screw part 7 formed inside the outer cylinder 73 with an attached outer cylinder
3b is screwed to the rear end male screw portion 72a of the rod 72. A worm gear 74 that is rotated by a motor M ₂ meshes with the wheel 73 a, and the rod 72 moves forward and backward by the drive of the motor M, whereby the fixed swing fulcrum A moves forward and backward, and the reflection type light source unit 20.
Is tilted about the horizontal axis Lx, and the optical axis L is tilted in the vertical direction.

The leveling mechanism 70 operates so as to tilt and adjust the optical axis L according to the loaded weight.
It also functions as a reflector tilting mechanism that tilts the light source unit 20 (reflector 21) in association with the shade driving mechanism 30. That is, the shade drive mechanism 30 is driven to move the shade 31 forward (the light distribution is switched from the passing beam to the traveling beam).
Then, the motor M ₂ is operated in association with the movement of the shade 31, the rod 72 is retracted, and the light source unit 20 (reflector 2 is moved so that the optical axis L is directed upward by a predetermined angle θ.
1) is tilted, and a traveling beam having a combined light distribution pattern of symbols Pa ′ and Pb ′ in FIG. 8 is formed. On the other hand, when the shade 31 reaches the retracted position (the light distribution is switched from the traveling beam to the passing beam), the shade 3
The motor M ₂ is operated in association with the movement of 1, the rod 72 is moved forward, and the light source unit 20 (reflector 21) is tilted so that the optical axis L is directed downward by a predetermined angle θ. A passing beam having a light distribution pattern indicated by Pa at is formed.

Further, as shown in FIG. 11, the conventional effective reflecting surface is an upper reflecting surface 1a for forming a passing / beam of parabolic shape and a lower side for forming a traveling beam of the same parabolic shape. The shade 4 has a rear extension 4a for forming a clear cut line, which has a shape corresponding to the boundary line between the effective reflection surfaces 1a and 1b. Therefore, in the conventional structure, the movement stroke of the shade 4 is large, and the shade drive mechanism 5
Was also large, which was one of the causes of increasing the weight of the headlamp.

However, in the present embodiment, the shake
Clear cut line using a part of the rear part (rear extension)
For forming passing and running beams, not for forming structures
The first reflecting surface 22a of the
22a₁, 22a₂, 22a _ThreeBy doing
It is designed to form
The first reflection surface 22a around the attachment hole 21a and the first reflection surface 22a
Effective with the second reflecting surface 22b outside the reflecting surface 22a
Since the reflecting surface 22 is configured, the shade 31 is simply
It has a cylindrical shape and does not require a portion corresponding to the extending portion 4a.
Therefore, the moving stroke of the shade 31 is higher than that of the conventional structure.
The shade drive mechanism 30 is shorter than the conventional structure.
The structure is compact and contributes to the weight reduction of the headlamp.
ing.

In the embodiment described above, the effective reflection surface 22 of the reflector 21 passes each other around the bulb insertion hole 21a.
Although it is composed of the first reflecting surface 22a for forming the traveling beam and the second reflecting surfaces 22b for forming the traveling beam formed on both right and left sides of the first reflecting surface 22a, the Japanese Patent Publication No. 7-6562. It may be a shade having an effective reflection surface disclosed in Japanese Patent Publication No. 1994-242242 and a shape corresponding to this effective reflection surface. That is, the reflector disclosed in Japanese Examined Patent Publication No. 7-6562 has a structure as shown in FIG. 9 and FIG. 11 showing the prior art, and the effective reflection surface 22 of the reflector shown in FIG. 9 has a bulb insertion hole 21a. And a first reflecting surface 22c formed of a general parabolic surface for forming a passing beam and a traveling beam, and a general parabolic surface for forming a traveling beam formed below the first reflecting surface 22c. A second reflective surface 22d consisting of, while the corresponding shade is
It has a semi-circular cross section like a vertically split cylinder. See also FIG.
The effective reflection surface of the reflector shown in FIG. 1 is a first parabolic surface formed on the upper side of the valve insertion hole 2 for forming a passing / running beam, which is a general parabolic surface, as described briefly in the prior art. 1a and a second reflecting surface 1b, which is a general parabolic surface for forming a traveling beam and extends from the lower side to the left and right sides of the first reflecting surface 1a, and the corresponding shade is designated by the reference numeral in FIG. 4 is shown.

In the above embodiment, the leveling mechanism 70 is used to adjust the vertical tilt of the reflector 21 when the traveling beam is formed.
However, a tilting mechanism that tilts the reflector 21 up and down by a predetermined angle θ may be provided instead of the leveling mechanism 70. Further, in the above-mentioned embodiment, the light source bulb is constituted by the discharge bulb which emits light by the discharge between the electrodes, but it may be an incandescent bulb or a halogen bulb which uses a filament as a light source.

In the above-described embodiment, the movable reflector headlamp in which the light source unit 20 provided in the lamp body 10 is tiltably supported has been described. However, the light source bulb is provided in the lamp body integrated with the reflector. The present invention can be similarly applied to a headlamp of a unit movable type in which a light source unit housed and integrally assembled with a front lens is tiltably supported with respect to a lamp housing mounted and fixed to a vehicle body. In particular, in the retractable headlamp, the retractable mechanism may be used instead of the leveling mechanism to vertically adjust the light source unit.

[0026]

As is apparent from the above description, according to the vehicle headlamp of the present invention, the reflector tilts forward and upward at the time of forming the traveling beam, and the passing /
Since the entire light distribution pattern formed by the traveling beam forming reflection surface moves upward, the brightness in the area near the vehicle is reduced compared to the brightness in the same area at the time of passing beam formation, and the travel The far illumination area of the beam feels relatively bright, which improves the visibility of the far distance. According to the fifth aspect, in the headlamp having the leveling mechanism, by linking the leveling mechanism and the shade driving mechanism, the present invention can be applied without separately providing a reflector tilting mechanism. Therefore, the leveling mechanism It is very easy to apply the present invention to a headlamp equipped with.

[Brief description of drawings]

FIG. 1 is a front view of a two-lamp type automobile headlamp according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same headlamp (see line II- in FIG. 1).
Sectional view along II)

FIG. 3 is a vertical sectional view of the headlamp (line III shown in FIG. 1).
Sectional view along -III)

FIG. 4 is a front view of a reflector in which a shade drive mechanism is assembled.

FIG. 5 is a horizontal sectional view of the same reflector (line V shown in FIG. 4).
(Cross-sectional view along -V)

FIG. 6 is a view showing a light distribution pattern by the reflector (a pattern that is not diffused by a front lens).

FIG. 7 is a diagram showing a light distribution pattern of a low beam of the same headlamp.

FIG. 8 is a diagram showing a light distribution pattern of a traveling beam of the headlamp.

FIG. 9 is a view showing another effective reflection surface of the reflector.

FIG. 10 is a longitudinal sectional view of a conventional headlamp.

FIG. 11 is a front view of a reflector of the same headlamp.

FIG. 12 is a diagram showing a light distribution pattern of a low beam of the same headlamp.

FIG. 13 is a view showing a light distribution pattern of a traveling beam of the headlamp.

[Explanation of symbols]

10 Lamp Body 21 Reflector 21a First Reflecting Surface for Passing / Running Beam Forming 22b Second Reflecting Surface for Forming Running Beam 26 Discharge Valve 27 Discharge Section 30 Shade Drive Mechanism 31 Shade 70 Leveling Mechanism Comprising Reflector Tilt Mechanism A, B, C Aiming mechanism forming part of the leveling mechanism L Optical axis Pa, Pa 'Light distribution pattern formed by first reflecting surface Pb, Pb' Light distribution pattern formed by second reflecting surface

Claims (7)

[Claims] 1. A container-shaped reflector having a reflective surface for forming a passing / traveling beam and a reflective surface for forming a traveling beam, a light source valve arranged at a predetermined position in front of the reflector, and a light distribution In order to switch between passing and traveling, a shade drive mechanism that moves a shade provided at a predetermined position surrounding the light source bulb along an optical axis, and an optical axis of the reflector in cooperation with the shade drive mechanism. An automotive headlamp, comprising: a reflector tilting mechanism that tilts in a vertical direction. 2. A reflector for passing / forming a traveling beam of the reflector is formed at a position surrounding a valve insertion hole formed in the reflector, while a reflector for forming the traveling beam is formed in a front opening of the reflector. It is formed near the edge, and when the shade moves forward, the light of the light source bulb is guided to the reflecting surface for forming the traveling beam and the reflecting surface for forming the passing beam and the traveling beam without being blocked by the shade, The vehicle headlamp according to claim 1, wherein when the shade moves rearward, the light from the light source bulb toward the reflection surface for forming the traveling beam is blocked by the shade. 3. The reflection surface for passing / traveling beam forming of the reflector is formed in an upper region of a valve insertion hole formed in the reflector, while the reflection surface for forming traveling beam is formed in the valve insertion hole. Is formed in a region near the front opening edge of the reflector that sandwiches the passing / traveling beam forming reflection surface from the lower side of the valve insertion hole or the lower side region to the left and right, and when the shade moves forward, The light from the light source bulb is guided to the traveling beam forming reflecting surface and the passing / passing beam forming reflecting surface without being blocked by the shade, but when the shade moves rearward, the light source bulb is used to form the traveling beam. The vehicle headlamp according to claim 1, wherein the light directed to the reflecting surface is blocked by the shade. 4. The reflector tilting mechanism tilts the reflector forward and upward when the shade moves forward, and tilts the reflector forward and downward when the shade moves backward. Alternatively, the automobile headlamp according to the item 3. 5. The headlamp includes a leveling mechanism for vertically adjusting the optical axis of the reflector in accordance with the loaded weight of the vehicle and the vertical tilt, and the reflector tilting mechanism allows the reflector tilting mechanism to operate. The headlamp for an automobile according to claim 1, which is configured. 6. The headlamp for an automobile according to claim 1, wherein the light source bulb is a discharge bulb that emits light by a discharge between electrodes facing each other in a closed glass sphere. 7. The headlamp is a movable reflector type in which a reflector having a light source bulb inserted therein is tiltably supported by a tilting mechanism with respect to a lamp body, or a lamp body in which a lens, a reflector and a light source bulb are integrated. The headlamp for a vehicle according to claim 1, wherein the unit is a movable unit supported so as to be tiltable with respect to the housing.