JP2000200509A - Headlight for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight for an automobile wherein a switching mechanism of light distribution of a low beam and a high beam can be reduced in size and be simplified and the switching of light distribution of a low beam and a high beam can be controlled accurately. SOLUTION: In this headlight, the width dimension Y1 of a movable shade 4 is to be smaller than the width dimension Y2 of a fixed shade 3 corresponding to a conventional shade 103. As a result, the distance X1 of the movable shade 4 is smaller than the distance X2 of the fixed shade 3 and the weight of the movable shade 4 is also smaller than that of the fixed shade 3, therefore distance ×weight = momentum becomes small. A driving means 5 for moving, fixing and supporting the movable shade 4 that the momentum is small can be reduced in size and be simplified and the control for accurately moving, fixing and supporting the movable shade 4 that the momentum is small is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a discharge lamp (a high-pressure metal vapor discharge lamp such as a metal halide lamp, a high-intensity discharge lamp (HID), etc.) as a light source. The present invention relates to a so-called two-lamp type vehicle headlamp obtained by switching between a low beam light distribution pattern and a high beam light distribution pattern during traveling, and in particular, switching between the low beam light distribution pattern and the high beam light distribution pattern described above. The present invention relates to a headlamp for an automobile which can have a simplified mechanism and can accurately control switching between the low beam light distribution pattern and the high beam light distribution pattern described above.

[0002]

2. Description of the Related Art An automotive headlamp of this type will be described below with reference to FIG. The headlamp for an automobile generally includes a discharge lamp 100, a first reflecting surface 101 on which a light distribution pattern of a predetermined low beam is obtained by reflecting light L1 from the discharge lamp 100, and light from the discharge lamp 100. L1 and L2 are reflected together with the first reflecting surface 101 to obtain a predetermined high beam light distribution pattern, and a low beam position at which the low beam light distribution pattern is obtained (shown by a solid line in FIG. 30). 30) and a high beam position (FIG. 30) where the light distribution pattern of the high beam is obtained.
30 (indicated by a dashed line in FIG. 30) so as to be switchable in the direction of the solid arrow and the direction of the dashed line in FIG. 30, and the first reflecting surface 101 and the second The reflected lights L11 and L2 reflected by the reflecting surface 102
A shade 103 for blocking direct light (not shown) directly emitted to the front other than 2 and switching between the low beam light distribution pattern and the high beam light distribution pattern;
And a driving means (not shown) for switching the shade 103 between the low beam position and the high beam position. Note that ZZ in FIG. 30 indicates the optical axis.

In the above-described automobile headlamp, when the discharge lamp 100 is turned on, light L1 from the discharge lamp 100,
L2 is reflected by the first reflection surface 101 and the second reflection surface 102, and the reflected lights L11 and L22 are emitted forward. Then, by operating the driving means to switch the shade 103 between the low beam position and the high beam position, a predetermined low beam light distribution pattern and a predetermined high beam light distribution pattern are obtained by switching. In addition, the shade 103 reflects the reflected light L <b> 1 of the light from the discharge lamp 100 reflected by the first reflection surface 101 and the second reflection surface 102.
1. Direct light emitted directly to the front other than L22 is blocked to prevent glare light. As the above-described headlamp for an automobile, for example, Japanese Patent Application Laid-Open No. 9-92005
There is one described in Japanese Patent Publication No.

[0004]

However, in the above-mentioned conventional headlamp for a vehicle, one shade 103 is used.
The first reflecting surface 101 and the second
It blocks direct light directly radiated forward except for the reflected light L11 and L22 reflected by the reflecting surface 102, and switches between a low-beam light distribution pattern and a high-beam light distribution pattern. Shade 103 becomes large. For example, the outer diameter Y2 of the cylindrical shade 103 is substantially equal to the inner diameter of the valve mounting hole 104. For this reason, in the above-mentioned conventional automobile headlamp, the driving means for switching the large shade 103 becomes large and complicated, and it is difficult to accurately control the switching of the large shade 103. That is, shade 10
When the size of the shade 3 increases, the amount of movement X2 of the shade 103 increases and the weight of the shade 103 also increases. Therefore, the amount of movement × weight = the amount of movement increases, and the driving means for moving and fixing and holding the same increases in size. And complex. In addition, it is difficult to control to move and fix the heavy shade 103 accurately. As a result, in the above-described conventional automotive headlamp, the switching mechanism between the low-beam light distribution pattern and the high-beam light distribution pattern is increased in size and complexity, and the low-beam light distribution pattern and the high-beam light distribution pattern are switched. It is difficult to control the switching accurately.

The present invention relates to an improvement of the above-described automobile headlamp, and an object thereof is to reduce the size and the size of a switching mechanism between a low beam light distribution pattern and a high beam light distribution pattern, and to realize a low beam light distribution pattern. An object of the present invention is to provide an automobile headlamp capable of accurately controlling switching between a light distribution pattern and a high beam light distribution pattern.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method for shading light from a discharge lamp other than light reflected by a first reflecting surface and a second reflecting surface out of light from a discharge lamp. Is divided into a fixed shade that blocks the direct light that is directly applied to the light source, and a movable shade that switches between a low-beam light distribution pattern and a high-beam light distribution pattern. Within the fixed shade, the movable shade is divided into a low-beam light distribution pattern. It is characterized by being arranged so as to be switchable between an obtained low beam position and a high beam position at which a high beam light distribution pattern is obtained.

As a result, the vehicle headlamp of the present invention can reduce the size of the movable shade as compared with the fixed shade corresponding to the conventional shade. Since the weight is smaller than the amount and the weight of the movable shade is also smaller than the weight of the fixed shade, the amount of movement × weight = the amount of exercise is small. The driving means for moving and holding the movable shade having a small momentum can be reduced in size and simplified, and the control for accurately moving and fixing the movable shade having a small momentum can be performed. Therefore, the automotive headlamp of the present invention can simplify the switching mechanism between the low beam light distribution pattern and the high beam light distribution pattern,
In addition, switching between the low beam light distribution pattern and the high beam light distribution pattern can be accurately controlled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, three examples of an embodiment of a vehicle headlamp according to the present invention will be described with reference to FIGS. In this example, a description will be given of an automobile headlamp in a left-hand traffic section. In the case of the right-hand traffic division, the left and right are reversed. Here, in the present specification and the drawings, the symbol “L” indicates the left side when viewed from the driver's seat side, and the symbol “R” indicates the right side when viewed from the driver's seat side. The symbol “U” indicates the upper side when the driver looks at the front from the driver's seat side, and the symbol “D” indicates the lower side when the driver sees the front from the driver's seat side. Further, reference numeral "HH" indicates a horizontal line, reference numeral "VV" indicates a vertical line, and reference numeral "ZZ" indicates an optical axis.

[Description of First Embodiment] FIGS. 1 to 12
1 shows a first embodiment of a vehicle headlamp according to the present invention. In the figure, reference numeral 1 denotes a discharge lamp. This discharge lamp 1
The socket 10 is detachably attached to the socket 10, and the socket 10 is detachably attached to the reflector 2 described later. As a result, the discharge lamp 1 is located at a predetermined position in the reflector 2.

In the figure, reference numeral 2 denotes a reflector. On the inner surface of the reflector 2, light L1 from the discharge lamp 1 is reflected to form a predetermined low beam light distribution pattern LP shown in FIG.
And the light L1 from the discharge lamp 1,
A second reflection surface 22 is provided to reflect L2 together with the first reflection surface 21 to obtain a predetermined high beam light distribution pattern HP shown in FIG. This first reflecting surface 21
As shown in FIGS. 2 to 6, the first reflection surface 21 is inside the part (upper and right and left sides) of the arc shown by the dashed line, and the second reflection surface 22 is outside. The faces 22 are respectively arranged.

Here, the predetermined low-beam light distribution pattern LP and the predetermined high-beam light distribution pattern HP are referred to as European light distribution standard ECEREG. Or a light distribution pattern conforming thereto (for example, Japanese type approval standard) or a light distribution pattern conforming to a light distribution standard such as FMVSS of the North American light distribution standard. In the low beam light distribution pattern LP described above,
Light distribution is standardized to limit glare. As a result, as shown in FIG. 7, the low-beam light distribution pattern LP has a light-dark boundary line LP1 that is considered for oncoming vehicles and pedestrians on the left shoulder of the road. In other words, the light-dark boundary line LP1 is between the right end and substantially the center, and the horizontal line HL-
A horizontal line portion LP2 located slightly below the HR and a gently, for example, 15 ° left upper portion, from a substantially horizontal line portion LP2 so as to visually recognize the left shoulder pedestrian without dazzling the left shoulder pedestrian. Gently inclined line portion L
P3. On the other hand, in the above-described high beam light distribution pattern HP, the maximum light intensity value and the maximum light intensity band are standardized. As a result, the high beam light distribution pattern HP described above has a hot zone HZ (a maximum luminous intensity zone including the maximum luminous intensity point) at the center as shown in FIG.

In FIG. 1, reference numeral 3 denotes a fixed shade (main shade) fixed to the reflector 2. As shown in FIGS. 1 to 4, the fixed shade 3 has a cylindrical cover portion 30 having a closed front portion and an open rear portion, and fixed legs integrally projecting from an opening lower end of the cover portion 30. And a unit 31. The fixing leg 31 is fixed to the reflector 2 by a screw, and as a result,
The cover part 30 is arranged in front of the discharge lamp 1. The fixed shade 3 emits direct light (not shown) of the light from the discharge lamp 1 that is directly radiated to the front other than the reflected lights L11 and L22 reflected by the first reflecting surface 21 and the second reflecting surface 22. It shields light. In addition, this fixed shade 3
The lateral width dimension Y2 of the cover 30 shown in FIG. 6 is substantially equal to the outer diameter dimension Y2 of the above-described conventional shade 103.

In FIG. 1, reference numeral 4 denotes a movable shade (sub shade). The movable shade 4 has a rectangular tube shape as shown in FIGS. 1 to 5, and the width Y 1 shown in FIG. 5 is the width Y 2 of the cover 30 of the fixed shade 3.
Smaller than the discharge lamp 1.
The movable shade 4 is moved to a low beam position (FIG. 1 and FIG. 5) where a predetermined low beam light distribution pattern LP is obtained outside the discharge lamp 1 and inside the cover 30 of the fixed shade 3 by a driving unit 5 described later. 4 and a high beam position at which a predetermined high beam light distribution pattern HP is obtained (a position indicated by a chain line in FIGS. 1 and 5 and FIG. 4). 1 and 5 in a direction indicated by a solid arrow and a direction indicated by a dashed-dotted line in FIG. 1 and FIG. The movable shade 4 switches between a predetermined low beam light distribution pattern LP and a predetermined high beam light distribution pattern HP.

In FIG. 1, reference numeral 5 denotes a driving means for moving the movable shade 4 between a low beam position and a high beam position. As shown in FIGS. 1 and 9 to 11, the driving means 5 includes a fixed base 50 and a solenoid 51.
And fixed guide rail 52 and movable guide rail 53
, A movable bracket (or stay) 54 and a tension coil spring 55 as an elastic member. That is, the base 50 is fixed to the reflector 2 by the screw. On this base 50, a solenoid 51 and a fixed-side guide rail 52 are fixed. The distal end of one end of the bracket 54 is fixed to the distal end of the plunger 56 of the solenoid 51 and the upper surface of the guide rail 53 on the movable side by a screw. At the other end of the bracket 54,
The movable shade 4 is fixed. In addition, bracket 5
A tension coil spring 55 is provided between the base 50 and the distal end of the one end bifurcated portion on the side where the plunger 56 is fixed.
Are attached to both ends. As a result, the movable shade 4 is constantly pulled toward the low beam position by the tension coil spring 55. In addition,
Reference numeral 500 denotes a stopper for stopping the movable-side guide rail 53 at the low beam position, and is provided integrally with the base 50 so as to protrude therefrom (a separate body from the base 50 may be provided).

The solenoid 51 described above is used in FIG.
, A coil (electromagnet) 57 for attracting the plunger 56 in the direction of the dashed-dotted arrow (high beam position side),
A magnet (permanent magnet) 58 is provided on the side opposite to the direction in which the plunger 56 of the coil 57 is attracted (in the direction indicated by the one-point arrow) (on the side indicated by the solid line and on the low beam position side). Reference numeral 59 denotes the plunger 56
The suction plate is integrally fixed to the suction plate.

The automotive headlamp of the present invention according to the first embodiment has the above-described configuration. Hereinafter, the switching operation between the low-beam light distribution pattern LP and the high-beam light distribution pattern HP will be described. First,
When the discharge lamp 1 is turned on, the lights L1 and L1 from the discharge lamp 1 are turned on.
2 is reflected by the first reflection surface 21 and the second reflection surface 22, and the reflected lights L11 and L22 are emitted forward.

Here, under normal conditions, the tension force (elastic action) of the tension coil spring 55 and the magnet 5
Due to the magnetic force of 8, the movable shade 4 is located at the low beam position (the position shown by the solid line in FIGS. 1 and 5 and the position shown in FIG. 3). At this time, the light L from the discharge lamp 1
1 is reflected by the first reflection surface 21, and the reflected light L11 is irradiated forward, so that a predetermined low beam light distribution pattern LP shown in FIG. 7 is obtained.

Next, when the coil 57 of the solenoid 51 is energized, the plunger 56 is pulled by the tension coil spring 55.
12 is attracted in the direction of the dashed-dotted arrow in FIG. 12 (high beam position side) against the pulling force and the magnetic force of the magnet 58. With the suction of the plunger 56, the movable shade 4 moves from the low beam position to the high beam position (FIGS. 1 and 5) via the bracket 54 and the guide rails 52 and 53.
(The position shown by the dashed line in FIG. 4, the position shown in FIG. 4)
To the solenoid 5 at the high beam position.
It is fixed and held by the attraction force of one coil 57. When the movable shade 4 is switched from the low beam position to the high beam position, the lights L1 and L2 from the discharge lamp 1 are reflected by the first reflecting surface 21 and the second reflecting surface 22, and the reflected lights L11 and L22 are irradiated forward. Thus, a predetermined high beam light distribution pattern HP shown in FIG. 8 is obtained.

When the energization of the coil 57 of the solenoid 51 is cut off, the movable shade 4
4 and the guide rails 52 and 53, the tension is pulled from the high beam position to the low beam position by the tensile force of the tension coil spring 55 and the magnetic force of the magnet 58, and is fixed and held. When the movable shade 4 is switched from the high beam position to the low beam position, the predetermined high beam light distribution pattern HP shown in FIG. 8 is switched to the predetermined low beam light distribution pattern LP shown in FIG. At this time, since the movable shade 4 is covered by the fixed shade 3, the movable state of the above-mentioned movable shade 4 is hidden by the fixed shade 3 and cannot be seen. The appearance is improved.

As described above, the vehicle headlamp according to the first embodiment of the present invention includes a shade and a discharge lamp 1.
The fixed shade 3 for blocking the direct light directly radiated to the front other than the reflected light L11 and L22 reflected by the first reflection surface 21 and the second reflection surface 22 of the light from the light source, and the low beam light distribution pattern LP The movable shade 4 is divided into a high-beam light distribution pattern HP and a high-beam light distribution pattern HP. In the fixed shade 3, the movable shade 4 is divided into a low beam position where a low beam light distribution pattern LP is obtained and a high beam where a high beam light distribution pattern HP is obtained. It is arranged such that it can be switched between positions.

As a result, as shown in FIGS. 5 and 6, the automotive headlamp according to the first embodiment has a movable shade 4 larger than the width Y2 of the fixed shade 3 corresponding to the conventional shade 103. Of the movable shade 4 becomes smaller than the displacement X2 of the fixed shade 3 because the width dimension Y1 of the fixed shade 3 can be reduced (small enough so as not to hit the discharge lamp 1). And the weight of the movable shade 4 is fixed.
, The amount of movement × the weight = the amount of exercise is small. The driving means 5 for moving and fixedly holding the movable shade 4 having a small amount of momentum can be reduced in size and simplifying, and the control for accurately moving and fixing and holding the movable shade 4 having a small amount of momentum can be performed. .

That is, since the attraction force of the coil 57 of the solenoid 51 is inversely proportional to the square of the distance for attracting the plunger 56, the smaller the amount of movement of the movable shade 4, the smaller the amount of movement via the bracket 54. The amount of movement of the plunger 56 is reduced, and the size of the solenoid 51 is reduced accordingly. In addition, the smaller the amount of movement of the movable shade 4, the smaller and lighter the guide rails 52 and 53 that guide the movement of the movable shade 4. Further, the smaller the weight of the movable shade 4 to be moved, the smaller the weight of the movable shade 4 and the tension of the tension coil spring 55 for moving the movable shade 4 and the coil 57 of the solenoid 51.
Is reduced, and the size of the solenoid 51 is reduced accordingly. Moreover, the smaller the weight of the movable shade 4, the smaller and lighter the bracket 54, to the extent that the bracket 54, which fixes and holds the movable shade 4, can withstand the vibration of the automobile. . In this way, it is possible to simplify the driving means 5 and to control the movement of the movable shade 4 accurately.

Accordingly, in the vehicle headlamp of the present invention in the first embodiment, the switching mechanism between the low-beam light distribution pattern LP and the high-beam light distribution pattern HP can be reduced in size and simplified, and the low-beam light distribution pattern can be simplified. Switching between the LP and the high beam light distribution pattern HP can be accurately controlled.

In particular, as shown in FIG. 12, the headlamp for a vehicle according to the first embodiment has a direction opposite to the direction in which the plunger 56 of the coil 57 is attracted (in the direction of the one-point arrow) of the solenoid 51 (solid arrow). Since the magnet 58 is provided on the (direction side), the movable shade 4 and the plunger 56 (including the bracket 54 and the movable-side guide rail 53 are included) by the magnetic force of the magnet 58 together with the tensile force of the tension coil spring 55. ) Is fixedly held at the low beam position. Therefore, the tension force of the tension coil spring 55 may be large enough to pull the movable shade 4 and the plunger 56 (including the bracket 54 and the movable guide rail 53) located at the high beam position toward the low beam position. The force for fixing and holding the movable shade 4 and the plunger 56 (including the bracket 54 and the movable-side guide rail 53) at the low beam position may be smaller. As a result, since the tension force of the tension coil spring 55 is small, the size of the solenoid 51 can be reduced accordingly.

In the first embodiment, since the movement of the movable shade 4 is controlled by the guide rails 52 and 53 via the bracket 54, the movable shade 4 can be accurately moved without looseness. Can be done.

Although the solenoid 51 is provided with the magnet 58 in the first embodiment, the automotive headlamp of the present invention can be applied to the solenoid 51 without the magnet 58.

FIGS. 13 and 14 show a modification of the first embodiment. In the drawing, the same reference numerals as those in FIGS. 1 to 12 denote the same components (those having different shapes but the same functions). In this modified example, elastic fitting means (pin 60 and hook 61) are provided between the fixed shade 3 side and the movable shade 4 side. That is, the bracket 54
The other end to which the movable shade 4 is fixed has a U-shape as viewed from the front, and the other end of the bracket 54 has a pin 60 in a direction substantially orthogonal to the optical axis Z-Z. It is fixed to. On the other hand, a hook 61 is fixed to the lower inner surface of the fixed shade 3 in correspondence with the pin 60. The hook 61 is made of a leaf spring member and has a J-shaped cross section.

Since this modified example has the above-described configuration, when the movable shade 4 is located at the low beam position (the position indicated by the solid line in FIG. 13), the movable shade 4 (the bracket 54) is not used. ) Side is elastically fitted to the hook 61 on the fixed shade 3 side, so that the movable shade 4 is held without looseness on the fixed shade 3 via the bracket 54, the pin 60 and the hook 61. When the movable shade 4 is located at the high beam position (the position indicated by the one-dot chain line in FIG. 13), the lower end of the bracket 54 to which the movable shade 4 is fixed is hooked to the fixed shade 3 by a hook 61.
, The movable shade 4 is held by the fixed shade 3 via the bracket 54 and the hook 61 without play. As a result, vibration of the movable shade 4 is prevented, and regular light distribution patterns LP and HP are obtained. Also,
By preventing the vibration of the movable shade 4, the stability of the movable shade 4 is improved, and the size and weight of the bracket 54 that supports the movable shade 4 are reduced.
The bracket 54 is excellent in durability such as metal fatigue.

In the above-described modified example, the example in which the elastic fitting means is provided on the low beam position side has been described. However, the elastic fitting means may be provided on the high beam position side, or the low beam position and the high beam position may be provided. Elastic fitting means may be provided at both positions.

[Description of Second Embodiment] FIGS. 15 to 21
Shows a second embodiment of the automotive headlamp of the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 14 denote the same components (different shapes but identical functions). The driving means 501 in this embodiment is a lever 502 type. That is, a portion of the lever 502 closer to one end from the intermediate portion of the lever 502 is rotatably attached to the fixed base 50 by the first shaft 503. This lever 502
Is connected to a solenoid 51 mounted on a base 50 at one end thereof.
Plunger (shaft) 56 is rotatably mounted via a hook 504 and a first pin 505.
The other end of the lever 502 has a forked shape, and the other end of the forked lever 502 has a second shaft 50.
A movable stay 507 is rotatably attached to the stay 507 via the movable stay 6. The movable shade 4 is fixed to the stay 507. Guide rails 52 and 53 are interposed between the stay 507 and the base 50. On the other hand, the second pin 510 substantially at the middle of the lever 502
A tension coil spring 55 is provided between the
Is interposed. In the figure, reference numeral 508 denotes a stopper on the high beam position side provided opposite to the stopper 500 on the low beam position side.

The headlamp for a vehicle according to the second embodiment of the present invention has the above-described configuration. The switching operation between the low-beam light distribution pattern LP and the high-beam light distribution pattern HP will be described below. In the normal state, the movable shade 4 is in the low beam position as shown by the solid line in FIG. 15 due to the tensile force (elastic action) of the tensile coil spring 55.
(Not shown) is reflected by the first reflection surface 21, and the reflected light (not shown) is irradiated forward, so that a predetermined low beam light distribution pattern LP shown in FIG. 7 is obtained.

Next, when the coil of the solenoid 51 is energized, the plunger 56 is attracted in the direction of the arrow in FIG. 16 (high beam position side) against the tensile force of the tension coil spring 55. With the suction of the plunger 56, the lever 502 rotates counterclockwise about the first shaft 503 in FIG. This lever 502
With the rotation of the stays 507, the stays 507
16, the movable shade 4 moves from the low beam position to the high beam position (the position indicated by the one-dot chain line in FIG. 15), and the solenoid 51 moves at the high beam position. It is fixed and held by the attractive force of the coil. When the movable shade 4 is switched from the low beam position to the high beam position, light from the discharge lamp 1 is reflected by the first reflection surface 21 and the second reflection surface 22, and the reflected light is irradiated forward, and FIG.
The light distribution pattern HP of the predetermined high beam shown in FIG. When the movable shade 4 is located at the high beam position, as shown in FIG. 17, the rising portion 509 of the stay 507 is in contact with the stopper 508 on the high beam side.

Then, when the energization of the coil of the solenoid 51 is cut off, the lever 502 rotates counterclockwise about the first shaft 503 in FIG. With the rotation of the lever 502, the stay 507 is moved to the guide rail 5
17, the movable shade 4 moves from the high beam position to the low beam position and is fixed and held at the same time. This movable shade 4
Is switched from the high beam position to the low beam position, whereby a predetermined high beam light distribution pattern H shown in FIG.
A predetermined low beam light distribution pattern LP shown in FIG.
Switch to When the movable shade 4 is located at the low beam position, as shown in FIG.
7 is in contact with the low beam side stopper 500.

The vehicle headlamp according to the second embodiment of the present invention can achieve the same functions and effects as those of the first embodiment. In particular, in the second embodiment, since the lever 502 is used, the amount of movement of the plunger 56 of the solenoid 51 is small. That is,
As shown in FIG. 21, the first shaft 503 and the first pin 5
05 is, for example, 10 mm, and the distance A2 between the first shaft 503 and the second shaft 506 is, for example, 50 mm.
mm, the moving amount of the movable shade 4 is, for example, 10 mm, and the operating force F2 is, for example, 1 kg, the stroke of the solenoid 51 is 2 mm, and the attraction force of the coil 57 of the solenoid 51 is 5 kg. . Here, when the stroke of the solenoid 51 is, for example, 10 mm, the attraction force of the coil 57 of the solenoid 51 is inversely proportional to the square of the distance for attracting the plunger 56.
The attraction force of the coil 57 of the solenoid 51 is only 0.2 kg, which requires a large solenoid. However, in the second embodiment, the stroke of the solenoid 51 is 2 mm, and
Since the attraction force of one coil 57 is 5 kg, the solenoid 51 may be small. In addition, since the movement amount X1 of the movable shade 4 is small, the stroke of the solenoid 51 is further reduced. As a result, similarly to the above-described first embodiment, downsizing of the driving unit 501, accurate movement control of the movable shade 4, and the like can be performed. The stroke of the solenoid 51 and the movement of the movable shade 4 are determined by the ratio of the distance A1 between the first shaft 503 and the first pin 505 of the lever 502 to the distance A2 between the first shaft 503 and the second shaft 506 of the lever 502. The amount can be adjusted.

In the second embodiment, the movement of the movable shade 4 is controlled by the guide rails 52 and 53 via the stays 507, so that it is the same as that of the first embodiment. The movable shade 4 can be moved accurately without any play.

Further, in the second embodiment, as shown in FIGS. 16 and 17, a second force is applied to move the movable shade 4 and the stay 507 by the lever 502.
The center O1 of the shaft 506, and the center O2 of the stay 507, the guide rail 53 on the movable side, and the fixed point (the screw 511) are aligned with the center of the guide rails 52, 53 in the guide direction (one point in FIGS. 16 and 17). (Shown by chain line)
Since it is located on the upper side, a rotational moment is applied to the guide rails 52, 53, that is, the guide rails 52, 5
Since no force is applied to the side surface of No. 3, the guide rail 53 on the movable side moves smoothly.

FIGS. 22 and 23 show a modification of the second embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 21 denote the same components (those having different shapes but the same functions). In this modification, a tension coil spring 5
5 is between the second shaft 506 and the base 50,
It is arranged vertically above and below the center line in the guide direction of the guide rail. As a result, the elastic action direction of the tension coil spring 55 coincides with the center line of the guide rails 52 and 53 in the guide direction, so that the force for returning the movable shade 4 and the stay 507 to the low beam position is reduced in the guide direction of the guide rails 52 and 53. Since it acts on the center line, no force is applied to the side surfaces of the guide rails 52 and 53, so that the movable-side guide rail 53 moves smoothly. As a result, the movable shade 4 and the stay 507 can be returned to the low beam position with a small elastic return force, so that the size of the tension coil spring 55 can be reduced, and the solenoid 5 that operates with a small elastic force can be achieved.
1 is also downsized.

In the second embodiment, a magnet 58 may be provided on the solenoid 51 as in the first embodiment. Further, in the second embodiment, similarly to the above-described first embodiment, an elastic fitting means (the pin 60 and the hook 61) may be provided between the fixed shade 3 side and the movable shade 4 side.

Further, in the second embodiment, the solenoid 51 of the driving means 501 is operated by the lever 502 type.
Sideways with respect to the movable shade 4 and the discharge lamp 1, and
It can be located above the lower side of the reflector 2. As a result, for example, in the case of a so-called reflector movable type vehicle headlamp in which the periphery of the reflector 2 is supported by a lamp housing (not shown) via an optical axis adjusting mechanism so as to be capable of adjusting the optical axis, the driving means 501 is used. The distance (arm) from the center of gravity (mainly the center of gravity of the solenoid 51) to the support point of the optical axis adjustment mechanism that supports the periphery of the reflector 2 becomes small,
The rotation moment applied to the support point of the optical axis adjustment mechanism is small, and the weight balance is improved. In addition, a space for storing the driving means 501 below the reflector 2 is reduced, and the entire headlamp for a vehicle is made compact.

FIG. 24 is a longitudinal sectional view showing a modification of the guide rail in the first and second embodiments. The above-mentioned guide rail is a guide rail 5 on the fixed side.
A steel ball group is interposed between the side surface of the movable side guide rail 53 and the side surface of the movable side guide rail 53 to smoothly move the movable side guide rail 53, and the movable side guide rail 53 is fixed to the fixed side guide rail. 52 is prevented from coming off.
In this modification, the steel ball group is eliminated, and the guide rails 520 on the fixed side are attached to the left and right shoulders of the guide rails 530 on the movable side.
Are engaged. By eliminating the steel ball group,
Accordingly, the number of parts and the cost can be reduced.

[Description of Third Embodiment] FIGS. 25 to 29
Shows a third embodiment of the automotive headlamp of the present invention. In the drawing, the same reference numerals as those in FIGS. 1 to 24 denote the same components (those having different shapes but the same functions). In the driving means 512 of this embodiment, the movable shade 4 is of a swing type. That is, the fixed-side base 50 has
The bracket 513 is fixed. This bracket 5
The left and right ends of the rotary shaft 514 are attached to the left and right ends of the thirteen via a bush 515, a spacer 516, and a ring 517 so as to be rotatable around an axis substantially orthogonal to the optical axis Z-Z. ing. This rotating shaft 5
A portion of the stay 518 near the one end from the middle portion is fixed by a screw 519 to the plane cut portion at the middle portion of the fourteenth portion. On the other hand, one end of the above-described stay 518 is attached to the tip of the plunger (shaft) 56 of the solenoid 51 mounted on the base 50 via a screw 519 and a plate 521 so as to be tiltable. The movable shade 4 is fixed to the other end of the stay 518. A compression coil spring 522 is interposed between the main body of the solenoid 51 and the plunger 56. In the drawing, reference numeral 523 denotes a low beam position side stopper provided on the reflector 2 so as to face the stay 518.

The vehicle headlamp according to the third embodiment of the present invention has the above-described configuration. Hereinafter, the switching operation between the low beam light distribution pattern LP and the high beam light distribution pattern HP will be described. In the normal state, the movable shade 4 is in the low beam position as shown by the solid line in FIG. 26 and FIG. 28 by the compression force (elastic action) of the compression coil spring 521, so that the light from the discharge lamp 1 (FIG. 7 (not shown) is reflected by the first reflecting surface 21, and the reflected light (not shown) is irradiated forward, and
Is obtained as shown in FIG.

Next, when the coil of the solenoid 51 is energized, the plunger 56 is attracted in the direction of the arrow (high beam position) in FIG. 28 against the compression force of the compression coil spring 521. With the suction of the plunger 56, the stay 518 rotates together with the rotating shaft 514 in the counterclockwise direction in FIGS. 26 and 28 around the center of the rotating shaft 514, and at the same time, the movable shade 4 moves from the low beam position. The head 51 is swung to the high beam position (the position shown by the one-dot chain line in FIG. 26 and the position shown in FIG. 29), and is fixed and held at the high beam position by the attractive force of the coil of the solenoid 51. When the movable shade 4 is switched from the low beam position to the high beam position, light from the discharge lamp 1 is reflected by the first reflection surface 21 and the second reflection surface 22, and the reflected light is radiated forward. The predetermined high beam light distribution pattern HP shown is obtained.

Then, when the energization of the coil of the solenoid 51 is cut off, the stay 518 is driven by the compression force of the compression coil spring 521 together with the rotating shaft 514 and the center of the rotating shaft 514 as an axis.
At 9, the movable shade 4 rotates clockwise, and at the same time, the movable shade 4 swings from the high beam position to the low beam position and is fixed and held. When the movable shade 4 is switched from the high beam position to the low beam position, the light distribution pattern HP of the predetermined high beam shown in FIG.
Is switched to the predetermined low beam light distribution pattern LP shown in FIG. When the movable shade 4 is located at the low beam position, as shown in FIG. 26 and FIG.
8 is in contact with the stopper 522 on the low beam side.

The vehicle headlamp according to the third embodiment of the present invention is the same as the above-described first embodiment and the second embodiment.
The same operation and effect as those of the embodiment can be achieved. In particular, in the third embodiment, the movable shade 4
Is connected to the solenoid 51 via a stay 518, so that the number of parts can be reduced.
The stroke of the solenoid 51 can be reduced.

The distance between the rotating shaft 514 of the stay 518 and the plunger 56 and the rotating shaft 51
4. The stroke of the solenoid 51 and the amount of movement of the movable shade 4 can be adjusted by the ratio to the distance between the movable shades 4. Further, in the third embodiment, the first
As in the embodiment, a magnet 58 may be provided in the solenoid 51. Further, in the third embodiment,
As in the first embodiment described above, an elastic fitting means (pin 60 and hook 61) may be provided between the fixed shade 3 side and the movable shade 4 side.

[Scope of application of headlamp for automobile of the present invention] In the headlamp for automobile of the present invention, the reflector 2 and the lamp housing (not shown) are separate bodies, and the reflector 2 is a lamp. A so-called reflector movable type headlamp for a vehicle, which is equipped with an optical axis adjustable with respect to a housing, and a reflector 2 and a lamp housing are integrated with each other, and the integrated lamp unit is attached to the vehicle body. The present invention can be applied to both a so-called movable lamp unit type automobile headlamp equipped with an optical axis adjustable.

Further, in the vehicle headlamp of the present invention, the movable shade 4 is provided with attenuation stop means for stopping attenuation of the movable shade 4 between the low beam position and the high beam position.
Can be reduced when the camera is stopped at the low beam position or the high beam position.

[0049]

As is apparent from the above description, in the headlamp for an automobile of the present invention, the movable shade is made smaller than the fixed shade corresponding to the conventional shade (as small as possible without hitting the discharge lamp). Since the moving amount of the movable shade is smaller than the moving amount of the fixed shade, and the weight of the movable shade is also smaller than the weight of the fixed shade, the moving amount × the weight = the momentum. Is small. The driving means for moving and holding the movable shade having a small momentum can be reduced in size and simplified, and the control for accurately moving and fixing the movable shade having a small momentum can be performed. Therefore, the automotive headlamp of the present invention can simplify the switching mechanism between the low-beam light distribution pattern and the high-beam light distribution pattern, and can accurately switch between the low-beam light distribution pattern and the high-beam light distribution pattern. Can be controlled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view (a sectional view taken along line II in FIG. 2) showing a first embodiment of a vehicle headlamp according to the present invention.

FIG. 2 is a front view of a reflection surface (a view taken in the direction of arrow II in FIG. 1).
It is.

FIG. 3 is a sectional view taken along line III-III in FIGS. 1 and 2 in a state where the movable shade is located at a low beam position.

FIG. 4 is a sectional view taken along line III-III in FIGS. 1 and 2 in a state where the movable shade is located at a high beam position.

FIG. 5 is a sectional view taken along the line III-III in FIGS. 1 and 2 showing a state where the movable shade is switched between a low beam position and a high beam position.

FIG. 6 shows a state in which a fixed shade corresponding to a conventional shade is switched between a low beam position and a high beam position, and FIG.
It is an I line sectional view.

FIG. 7 is an explanatory diagram of a light distribution pattern of a low beam.

FIG. 8 is an explanatory diagram of a light distribution pattern of a high beam.

FIG. 9 is a plan view of a driving unit.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a sectional view taken along line XI-XI in FIG. 9;

FIG. 12 is a longitudinal sectional view of a solenoid.

FIG. 13 is a longitudinal sectional view (a sectional view corresponding to FIG. 1) showing a modification of the first embodiment of the automotive headlamp of the present invention.
It is.

14 is a sectional view taken along line XIV-XIV in FIG.

FIG. 15 is a longitudinal sectional view (a sectional view corresponding to FIG. 1) showing a second embodiment of the automotive headlamp of the present invention.

FIG. 16 is a plan view of the driving unit in a low beam position.

FIG. 17 is a plan view of the driving unit in a high beam position.

18 is a sectional view taken along line XVIII-XVIII in FIG.

19 is a sectional view taken along line XIXU-XIXU and a sectional view taken along XIXD-XIXD in FIG. 16;

FIG. 20 is a rear view.

FIG. 21 is an explanatory diagram of the operation of the lever.

FIG. 22 is a plan view of a driving unit in a state of a low beam position, showing a modification of the second embodiment of the automotive headlamp of the present invention.

FIG. 23 is a sectional view taken along line XXIII-XXIII in FIG. 22;

FIG. 24 is a longitudinal sectional view of a guide rail showing a modification of the first and second embodiments of the automotive headlamp of the present invention.

FIG. 25 is a front view showing a third embodiment of the automotive headlamp of the present invention.

26 shows XX in FIG. 25 in a state of a low beam position.
It is a VI-XXVI line sectional view.

FIG. 27 shows XX in FIG. 26 in a state of a low beam position.
It is a VII-XXVII line sectional view.

FIG. 28 is a view showing the state of XX in FIG. 27 in a state of a low beam position.
It is a VIII-XXVIII line sectional view.

FIG. 29 is a view showing XX in FIG. 27 in a state of a high beam position.
It is a VIII-XXVIII line sectional view.

FIG. 30 is a cross-sectional view (a cross-sectional view corresponding to FIGS. 3 to 6) showing a conventional automobile headlamp.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Discharge lamp, 10 ... Socket, 2 ... Reflector, 21 ...
1st reflection surface, 22 ... 2nd reflection surface, 3 ... fixed shade, 4
... Movable shade, 5,501,512 ... Drive means, 51
... Solenoid, 55 ... Tension coil spring (elastic member), 58 ... Magnet, L1, L2 ... Light from discharge lamp, L11 ... Reflection light on first reflection surface, L22 ... Reflection light on second reflection surface, LP ... Light distribution pattern of low beam, HP
... High-beam light distribution pattern, X1... Movable shade movement amount, Y1... Width of movable shade, 60.
1 ... hook, 502 ... lever, 503 ... first shaft,
504 hook, 505 first pin, 506 second shaft, 507 stay, 510 second pin, 513 bracket, 514 rotating shaft, 518 stay, 5
22 ... compression coil spring.

Claims (8)

[Claims] 1. A discharge lamp, a first reflection surface that reflects light from the discharge lamp to obtain a predetermined low beam light distribution pattern, and reflects light from the discharge lamp together with the first reflection surface. A second reflection surface from which a predetermined high-beam light distribution pattern is obtained; and the first reflection surface and the second reflection surface of light from the discharge lamp.
A fixed shade that blocks direct light that is directly radiated forward other than the light reflected by the reflecting surface, and a low beam position and a high beam light distribution pattern where the low beam light distribution pattern is obtained within the fixed shade are obtained. And a movable shade that switches between the low-beam light distribution pattern and the high-beam light distribution pattern, and a drive that moves and switches the movable shade between the low-beam position and the high-beam position. And a vehicle headlamp. 2. The driving means includes: a solenoid having the movable shade fixed to a plunger; and an elastic member for constantly biasing the movable shade toward the low beam position.
And a magnet for fixedly holding the movable shade at the low beam position, and when the solenoid is energized, the movable shade moves from the low beam position to the high beam position against the elastic force of the elastic member and the magnetic force of the magnet. Position, the movable shade is moved from the high beam position to the low beam position by the elastic action of the elastic member and the magnetic force of the magnet, and is fixed and held, when the power to the solenoid is cut off. The automotive headlamp according to claim 1, wherein: 3. The driving means includes: a fixed base, a solenoid mounted on the base, a movable bracket having the movable shade connected and fixed to a plunger of the solenoid; A guide rail that is interposed therebetween and guides a switching movement between the low beam position and the high beam position of the movable shade, and an elastic member that constantly biases the movable shade toward the low beam position. When the solenoid is energized, the movable shade is attracted and held from the low beam position to the high beam position against the elastic force of the elastic member, and when the energization to the solenoid is cut off, the movable shade is The member is moved from the high beam position to the low beam position by the elastic action of the member and fixedly held. The headlamp for an automobile according to claim 1, wherein: 4. The driving means includes: a fixed base, a solenoid mounted on the base, a lever rotatably mounted on the base and one end mounted on a plunger of the solenoid. A movable stay fixed to the other end of the lever, and fixed to the movable shade, and interposed between the stay and the base, between the low beam position and the high beam position of the movable shade; And a resilient member that constantly urges the movable shade toward the low beam position. When the solenoid is energized, the movable shade resists the elastic force of the elastic member. When the low beam position is suction-fixed and held from the low beam position to the high beam position and the energization to the solenoid is cut off, the movable The automotive headlamp according to claim 1, wherein the shade moves from the high beam position to the low beam position and is fixedly held by an elastic action of the elastic member. 5. The headlamp for an automobile according to claim 4, wherein an attachment point between the other end of the lever and the stay is located at a center in a guide direction of the guide rail. 6. The headlamp for an automobile according to claim 3, wherein an elastic action direction of the elastic member is located in a vertical direction of a center line in a guide direction of the guide rail. 7. The driving unit includes: a fixed-side base; a solenoid mounted on the base; and a rotary shaft mounted on the base so as to be rotatable around an axis crossing an optical axis. A movable stay fixed to the rotating shaft and having one end attached to the plunger of the solenoid and the other end fixed to the movable shade; and the movable shade is constantly biased toward the low beam position. And an elastic member,
When the solenoid is energized, the movable shade rotates against the elastic force of the elastic member and is suction-fixed and held from the low beam position to the high beam position.When the energization to the solenoid is cut off, the movable shade is 2. The headlamp for an automobile according to claim 1, wherein the headlamp is rotated by the elastic action of the elastic member to move from the high beam position to the low beam position, and is fixed and held. 8. The fixed shade side and the movable shade side are provided with elastic fitting means for holding the movable shade at the low beam position and / or the high beam position. Item 1 or 2 or 3
Or a vehicle headlamp according to 4 or 5 or 6 or 7.