JP2007035332A - Vehicle headlamp - Google Patents

Abstract

To provide a vehicle headlamp with a movable shutter that can reduce the illuminance in front of the vehicle, for example, during high-speed running or bad weather.
An ellipsoidal first reflecting surface having a first focal position on the rear side disposed in the vicinity of a light source, a first projection lens disposed in front of the first reflecting surface, and a rear side. The elliptical system is arranged on the upper side of the first reflecting surface so that the first focal position F1 is located near the light source and the second focal position F2 is located above the second focal position of the first reflecting surface. The second reflecting surface 13, the convex second projection lens 15 disposed in front of the second reflecting surface, and the movable disposed so as to be movable between the first and second reflecting surfaces. A first position A where the movable shutter blocks light from the light source toward the second reflecting surface, a second position B retracted from the optical path, and the first projection lens. A vehicle headlight that can be selected with a third position that blocks the light irradiated in front of the vehicle 0 to configure.
[Selection] Figure 1

Description

  The present invention relates to a vehicle headlamp that is used, for example, as a headlamp or an auxiliary headlamp provided at the front of an automobile.

Conventionally, such a vehicle headlamp is disclosed in, for example, Patent Document 1 and is configured as shown in FIG.
That is, the vehicle headlamp 1 includes a bulb 2 as a light source, an elliptical reflecting surface 3, a first reflecting plate 4, a second reflecting plate 5, a parabolic reflecting surface 6, and a second reflecting plate. A parabolic reflecting surface 7.

The elliptical reflective surface 3 is composed of an elliptical reflective surface having the bulb 2 as the first focal point (rear focal point) and the long axis extending obliquely upward toward the front, and the inner surface is formed as a reflective surface. Has been.
Here, the elliptical reflecting surface includes not only a spheroid and an elliptic cylinder but also a free-form surface based on an ellipsoid.

  Further, a part of the elliptical reflective surface 3 is configured as a movable reflective surface 3a, and the insertion position shown in FIG. 3 and the other part (fixed part) outside the elliptical reflective surface 3 are arranged. It is moved by a driving means (not shown) between the retracted position. Further, the elliptical reflecting surface 3 is provided with an opening 3 b in a region below the bulb 2.

  The first reflecting plate 4 is disposed in front of the second focal point of the elliptical reflecting surface 3 when viewed from the bulb 2, and the light reflected by the elliptical reflecting surface 3 and traveling toward the second focal point is lowered. The side of the bulb 2 is configured as a reflecting surface so as to be reflected toward the surface.

The second reflecting plate 5 is disposed substantially vertically, that is, so as to extend downward from the lower edge of the first reflecting plate 4, and the lower end edge of the second reflecting plate 5 is the ellipse formed by the first reflecting plate 4. It is disposed so as to be located near the mirror image position of the second focal point (front focal point) of the system reflecting surface 3.
Moreover, the 2nd reflecting plate 5 is comprised by the valve | bulb 2 side as a reflective surface.

As shown in FIG. 4, the parabolic reflecting surface 6 is arranged only in a region below the optical axis on the front side of the bulb 2, and the focal position is an elliptical system formed by the first reflecting plate 4. The reflection surface 3 is configured as a parabolic reflection surface that is concave toward the front and located near the mirror image position of the second focal point.
Here, the parabolic reflecting surface includes not only a rotating parabolic surface and a parabolic column but also a free curved surface based on a parabolic surface.

The second parabolic reflecting surface 7 is arranged on the rear side of the bulb 2 and is configured as a concave parabolic reflecting surface facing forward such that its focal position is located in the vicinity of the bulb 2. ing.
As shown in FIG. 4, the second parabolic reflecting surface 7 includes an upper region 7 a above the optical axis of the bulb 2 and a lower region 7 b below, and the upper region 7 a is an elliptical reflecting surface 3. The light that has passed through the retracted area of the movable reflective surface 3a is reflected straight forward, and the light that has passed through the opening 3b of the elliptical reflective surface 3 is slightly lowered downward in the lower region 7b. It is designed to reflect.

  According to the vehicle headlamp 1 having such a configuration, when the movable reflecting surface 3a is in the insertion position, the bulb 2 is fed and emits light, so that the light emitted from the bulb 2 is Reflected by the elliptical reflecting surface 3 including the movable reflecting surface 3a, proceeds upward toward the vicinity of the second focal point of the elliptical reflecting surface 3, and is reflected by the first reflecting plate 4 before the second focal point. And go down. At this time, the light travels toward the mirror image position of the second focal point of the elliptical reflecting surface 3 by the first reflecting plate 4.

The light that has traveled to the vicinity of the mirror image position is reflected by the reflecting surface of the second reflecting plate 5 so that the light that is substantially above the lower end edge of the second reflecting plate 5 is reflected downward. Then, the light travels diagonally backward, enters the parabolic reflection surface 6, and is reflected slightly downward by the parabolic reflection surface 6 toward the front.
On the other hand, almost half of the light incident downward from the lower end edge of the second reflecting plate 5 is not reflected by the reflecting surface of the second reflecting plate 5 and proceeds downward as it is. The light enters the reflecting surface 6 and is reflected slightly forward by the parabolic reflecting surface.
Further, the light emitted from the bulb 11 and passing through the opening 3b of the elliptical reflecting surface 3 is incident on the lower region 7b of the second parabolic reflecting surface 7, and is slightly forwardly directed by the lower region 7b. Reflected downward.

In this way, the light emitted from the bulb 2 and reflected by the elliptical reflecting surface 3 and the first reflecting plate 4 is distributed by the second reflecting plate 5 and then is parabolically reflected by the parabolic reflecting surface 6. The light that has been reflected and passed through the opening 3b of the elliptical reflecting surface 3 is reflected by the lower region 7b of the second parabolic reflecting surface 7, and both are irradiated slightly downward toward the front of the automobile. The
As a result, each light forms a so-called passing beam that is slightly semicircular below the horizontal line.
Accordingly, since all the light emitted from the bulb 2 and reflected by the elliptical reflecting surface 3 is used to form a passing beam, the utilization efficiency of the light from the bulb 2 is improved. Brighter light distribution characteristics can be obtained.

  On the other hand, when the movable reflecting surface 3a is retracted from the insertion position to the retracted position by driving means (not shown), the bulb 2 is supplied with power and emits light so that the light emitted from the bulb 2 is movable. Reflected by the elliptical reflective surface 3 excluding the reflective surface 3a, proceeds upward toward the vicinity of the second focal point of the elliptical reflective surface 3, and is reflected by the first reflective plate 4 before the second focal point. Go down. At this time, the light travels toward the mirror image position of the second focal point of the elliptical reflecting surface 3 by the first reflecting plate 4.

Then, the light L that has advanced to the vicinity of the mirror image position is reflected by the reflecting surface of the second reflecting plate 5 so that almost half of the light incident above the lower end edge of the second reflecting plate 5 is slightly below. It progresses diagonally rearward, enters the parabolic reflection surface 6, and is reflected slightly downward toward the front by the parabolic reflection surface 6.
On the other hand, almost half of the light incident downward from the lower end edge of the second reflecting plate 5 is not reflected by the reflecting surface of the second reflecting plate 5 and proceeds downward as it is. The light enters the reflecting surface 6 and is reflected slightly downward by the parabolic reflecting surface 6 toward the front.

Further, the light emitted from the bulb 2 and passing through the opening 3b of the elliptical reflecting surface 3 is incident on the lower region 7b of the second parabolic reflecting surface 7, and is slightly forwardly directed by the lower region 7b. Reflected downward.
Further, the light L4 emitted from the bulb 2 and passing through the retracted area of the movable reflecting surface 3a of the elliptical reflecting surface 3 is incident on the upper region 7a of the second parabolic reflecting surface 7, and this upper region 7a. Is reflected straight forward.

In this way, the light emitted from the bulb 2 and reflected by the elliptical reflecting surface 3 and the first reflecting plate 4 is distributed by the second reflecting plate 5 and then is parabolically reflected by the parabolic reflecting surface 6. The light that has been reflected and passed through the opening 3b of the elliptical reflecting surface 3 is reflected by the lower region 7b of the second parabolic reflecting surface 7, and both are irradiated slightly downward toward the front of the automobile. The
As a result, each light forms a so-called passing beam that is slightly semicircular below the horizontal line.
Accordingly, since all the light emitted from the bulb 2 and reflected by the elliptical reflecting surface 3 is used to form a passing beam, the utilization efficiency of the light from the bulb 2 is improved. Brighter light distribution characteristics can be obtained.

Furthermore, the light emitted from the bulb 2 and passing through the retracted area of the movable reflecting surface 3a of the elliptical reflecting surface 3 is reflected by the upper region 7a of the second parabolic reflecting surface 7 and is forward of the automobile. Irradiates straight.
Thereby, the light forms a so-called traveling beam concentrated near the center slightly above the horizon.
Accordingly, the light emitted from the bulb 2 and passing through the retracted area of the movable reflecting surface 3a of the elliptical reflecting surface 3 forms a traveling beam, and the light distribution characteristics of the passing beam and the traveling beam by one bulb 2 are obtained. Is obtained.
JP 2002-093217 A

In the headlamp 1 having such a configuration, the single beam 2 can be used to switch between the passing beam and the traveling beam by the movement of the movable reflecting surface 3a.
Accordingly, by moving the movable reflecting surface 3a in response to a change in the driving state, the light can be appropriately irradiated to the front of the automobile by switching the light distribution pattern between the passing beam and the driving beam. It can be done.

By the way, for example, when traveling at a high speed, if a relatively close area in front of the front is irradiated with a traveling beam, the front side becomes brighter, which makes it difficult to see when the driver looks far away.
Also, for example, in bad weather, if light is irradiated to a relatively near area in front of the traveling beam, the light is reflected by raindrops and the like, and it becomes difficult to see far away.

  However, in the headlamp 1, it is possible to switch between a passing beam and a traveling beam by moving the movable reflecting surface 3a. However, according to various traveling environments such as the above-described high-speed traveling and bad weather. It was not possible to create light distribution patterns and change them accordingly.

  In view of the above, the present invention provides a vehicle headlamp that can change the illuminance in front of the vehicle according to changes in the driving environment, such as during high-speed driving or bad weather, with a simple configuration. The purpose is to do.

  According to the configuration of the present invention, the first focus position is located near the light source and the second focus position is forward so that the light from the light source and the light from the light source are reflected forward. A first ellipsoidal reflecting surface that is concave toward the front disposed so as to be positioned on the optical axis of the light source extending substantially horizontally, and on the optical axis of the light source in front of the first reflecting surface. And a convex first projection lens arranged so that the focal position on the light source side is located near the second focal position on the first reflecting surface, and reflects light from the light source forward. As described above, the first focal position is located near the light source, and the second focal position is located above the first reflective surface so that the second focal position is located above the second focal position of the first reflective surface. A second elliptic reflecting surface that is concave toward the front, and a second reflecting surface in front of the second reflecting surface. A convex second projection arranged so that the position on the light source side is located near the second focal position of the second reflecting surface on an axis extending substantially horizontally forward through the focal position of A movable shutter disposed movably between the first reflective surface and the second reflective surface, wherein the movable shutter is moved from the light source to the second reflective surface. A first position that blocks light that travels and does not interfere with light that is reflected by the first reflecting surface and travels to the first projection lens; and does not interfere with light that travels from the light source toward the second reflecting surface; A second position that does not interfere with the light that is reflected by the reflective surface and travels to the first projection lens, and further that the light that travels from the light source toward the second reflective surface is not obstructed and is reflected by the first reflective surface. Of the light that travels to the projection lens of A third position in which the cross-sectional, characterized in that the take selectively, by the vehicle headlamp is achieved.

  The vehicle headlamp according to the present invention is preferably located near the second focal position of the first reflecting surface when the movable shutter is in the third position.

  In the vehicle headlamp according to the present invention, the movable shutter is preferably biased so as to return to the first position by a spring.

  In the vehicle headlamp according to the present invention, preferably, the movable shutter is supported so as to be swingable around a rotation axis extending in the lateral direction.

  In the vehicle headlamp according to the present invention, preferably, the movable shutter is supported so as to be movable along a desired movement curve.

  In the vehicle headlamp according to the present invention, preferably, the movable shutter is configured as a plane, and is disposed substantially horizontally at the first position and substantially vertically at the third position.

  The vehicle headlamp according to the present invention is preferably formed such that the movable shutter constitutes a part of an elliptical shape constituting the first reflecting surface at the first position.

  In the vehicle headlamp according to the present invention, the surface of the movable shutter facing the light source at the first position is preferably configured as a reflecting surface.

  In the vehicle headlamp according to the present invention, preferably, the movable shutter is disposed in the vicinity of the second focal position of the first reflecting surface, and a first fixed shutter for forming a predetermined cutoff line; And / or a second fixed shutter disposed near the second focal position of the second reflecting surface and for forming a predetermined cutoff line.

According to the above configuration, when the movable shutter is in the first position, the light emitted from the light source is reflected directly or by the first reflecting surface and is focused toward the second focal position, Further, the light is irradiated forward through the first projection lens.
In addition, since the light emitted from the light source and traveling toward the second reflecting surface is blocked by the movable shutter, the light from the light source does not enter the second reflecting surface, and thus the second reflecting surface causes the second reflecting surface to enter the second reflecting surface. No light is irradiated forward through the projection lens.
Thereby, light is irradiated forward only from the first reflecting surface via the first projection lens, for example, a low beam is irradiated.

On the other hand, when the movable shutter is in the second position, similarly, the light emitted from the light source is reflected directly or by the first reflecting surface and is focused toward the second focal position. Further, the light is irradiated forward through the first projection lens. Further, the light emitted from the light source and traveling toward the second reflecting surface is incident on the second reflecting surface without being blocked by the movable shutter. Therefore, the light reflected by the second reflecting surface is converged toward the second focal position, and further irradiated forward through the second projection lens.
As a result, light is irradiated forward from the first reflecting surface through the first projection lens and from the second reflecting surface through the second projection lens, respectively. In addition, for example, a traveling beam is irradiated by the second projection lens.

  Further, when the movable shutter is in the third position, the light emitted from the light source is reflected directly or by the first reflecting surface and converged toward the second focal position, and the first shutter Irradiated forward through the projection lens. At that time, the light near the lower edge of the light irradiated forward through the first projection lens by the movable shutter at the third position, that is, the front front of the automobile is irradiated. By blocking the light, the illuminance of the above-mentioned passing beam is reduced.

Further, the light emitted from the light source and traveling toward the second reflecting surface is incident on the second reflecting surface without being blocked by the movable shutter. Therefore, the light reflected by the second reflecting surface is converged toward the second focal position, and further irradiated forward through the second projection lens.
As a result, light is irradiated forward from the first reflecting surface through the first projection lens and from the second reflecting surface through the second projection lens, respectively. The illuminance of the beam is reduced and, for example, a traveling beam is irradiated by the second projection lens.

  In this case, since each light distribution pattern is switched only by moving the movable shutter to the first position, the second position, and the third position, each light distribution pattern can be obtained by one light source. Thus, the entire vehicle headlamp can be made compact with a simple configuration.

  When the movable shutter is at the third position and the second shutter position is located above the second focal position of the first reflecting surface, the second reflected light from the first reflecting surface is focused. Since the movable shutter blocks light in the vicinity of the focal position, light can be reliably blocked by a relatively small movable shutter.

  When the movable shutter is urged to return to the first position by the spring, the driving means for moving the movable shutter moves the movable shutter in the second position or the third position direction. All that is required is a simple configuration, and the overall configuration can be made smaller.

  When the movable shutter is supported so as to be swingable about a rotation shaft extending in the lateral direction, the movable shutter is easily moved from the first position to the second position by swinging around the rotation shaft. Or a third position.

  When the movable shutter is supported so as to be movable along a desired movement curve, the movable shutter can be easily and reliably moved from the first position to the second position by using, for example, a cam. It can be brought to a position or a third position.

  When the movable shutter is configured as a flat surface and is disposed substantially horizontally at the first position and substantially vertically at the third position, the manufacturing cost of the movable shutter can be reduced. In addition, by being arranged horizontally at the first position, it can be reliably retracted from the optical path of the light from the first reflecting surface toward the first projection lens, The light can be reliably blocked.

  The movable shutter is formed so as to constitute a part of an elliptical shape constituting the first reflecting surface at the first position, and a light source is formed at the first position of the movable shutter. When the movable shutter is in the first position, the movable shutter acts as a part of the first reflective surface, so that the surface from the light source The light is reflected and focused on the second focal position. Therefore, when the movable shutter is at the first position, the light from the light source can be more efficiently guided to the first projection lens, and the illuminance of the passing beam can be improved.

  The movable shutter is disposed in the vicinity of a second focal position of the first reflecting surface, and a first fixed shutter for forming a predetermined cut-off line and / or a second of the second reflecting surface. And a second fixed shutter for forming a predetermined cut-off line, it is irradiated forward from the first reflecting surface via the first projection lens. The low-pass beam is cut off by the first fixed shutter to form a light distribution pattern suitable for the low-pass beam, and the traveling beam irradiated forward from the second reflecting surface via the second projection lens A cut-off line is formed by the second fixed shutter, and a light distribution pattern suitable for the traveling beam is obtained.

In this way, by moving the movable shutter to the first position, for example, a low beam is irradiated forward from the first reflecting surface via the first projection lens, and the movable shutter is moved to the second position. By moving to this position, the above-mentioned passing beam is irradiated forward, and a traveling beam, for example, is irradiated forward from the second reflecting surface via the second projection lens. .
Further, by moving the movable shutter to the third position, when the low beam is irradiated forward from the first reflecting surface via the first projection lens, the movable shutter moves forward. Since the irradiated light is blocked, the illuminance of the passing beam is lowered and, for example, a traveling beam is irradiated forward from the second reflecting surface via the second projection lens.
As a result, when the movable shutter is in the third position, the low beam and the traveling beam having relatively low illuminance are emitted forward, so that the front side is bright, for example, during high-speed traveling or in bad weather. It won't be too hard to see far away.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

[Example 1]
FIG. 1 shows the configuration of a first embodiment of a vehicle headlamp according to the present invention.
In FIG. 1, a vehicle headlamp 10 includes a bulb 11 as a light source, a first reflecting surface 12 and a second reflecting surface 13 that reflect light from the bulb 11 forward, and the first reflecting surface. A first projection lens 14 disposed in front of the reflective surface 12, a second projection lens 15 disposed in front of the second reflective surface 13, and the first reflective surface 12 and the first projection. A first fixed shutter 16 disposed between the lens 14, a second fixed shutter 17 disposed between the second reflecting surface 13 and the second projection lens 15, and the first The movable shutter 18 is disposed between the reflecting surface 12 and the second reflecting surface 13.

  The bulb 11 is a bulb generally used for an automobile headlamp or an auxiliary headlamp. For example, a bulb such as an incandescent bulb, a halogen bulb, a halogen bulb with an infrared reflecting film, or a discharge lamp such as a metal halide lamp is used. In use, the optical axis O is arranged almost horizontally toward the front, is fixedly held by a socket, and is supplied with power.

The first reflecting surface 12 is formed in a concave shape so as to reflect the light from the bulb 11 forward, and the first focal position F1 is located in the vicinity of the bulb 11, It is configured as an elliptical reflecting surface so that the second focal position F2 is positioned on the optical axis O extending forward from the bulb 11 on the front side.
Here, the elliptical reflecting surface includes not only a spheroid and an elliptic cylinder but also a free-form surface based on an ellipsoid.

  The second reflecting surface 13 is formed in a concave shape so as to reflect the light from the bulb 11 forward, and the first focal position F1 is located in the vicinity of the bulb 11, The second focal position F3 is located above the optical axis O, that is, is disposed above the first reflecting surface 12 so that the long axis l extends obliquely upward toward the front. Similarly, It is configured as an elliptical reflecting surface.

  The first projection lens 14 is composed of a convex lens, and the focal point on the light source side is located near the second focal position F2 of the first reflecting surface 12 on the optical axis O. To be arranged.

  The second projection lens 15 is similarly composed of a convex lens, and passes through the second focal position F3 of the second reflecting surface 13 and extends in parallel with the optical axis O. On O2, the light source side focal point is arranged so as to be located in the vicinity of the second focal point position F3 of the second reflecting surface 13.

The first fixed shutter 16 is made of a non-translucent material, and an upper edge 16a thereof is a focal position on the light source side of the first projection lens 14, that is, a second of the first reflecting surface 12. It is arrange | positioned so that it may be located near the focus position F2.
The upper edge 16a of the first fixed shutter 16 forms a desired light distribution pattern, for example, a low beam cut-off line.

Similarly, the second fixed shutter 17 is made of a non-translucent material, and an upper edge 17a of the second projection lens 15 is focused on the light source side of the second projection lens 15, that is, the second reflecting surface 13. It arrange | positions so that it may be located in the 2nd focus position F3 vicinity.
The upper edge 17a of the second fixed shutter 17 forms a desired light distribution pattern, for example, a travel beam cut-off line.

  As shown in FIG. 1, the movable shutter 18 is arranged in front of these at the height position between the first reflecting surface 12 and the second reflecting surface 13. The rotary shaft 19 is supported so as to be swingable around a rotation shaft 19 fixedly disposed so as to extend laterally with respect to the optical axes O and O2.

The movable shutter 18 can be moved from a first position indicated by reference numeral A to a second position indicated by reference numeral B or a third position indicated by reference numeral C by driving means (not shown).
In this case, the driving means is configured to reciprocate the movable shutter 18 from the first position A to the second position via the third position C by a motor or the like, or the movable shutter 18 is moved to the second position. While moving from the 1st position A to the 2nd position via the 3rd position C, you may make it return to the 1st position A with the spring which is not illustrated.

In the first position A, the movable shutter 18 is disposed substantially horizontally so that the tip thereof optically shields between the first reflecting surface 12 and the second reflecting surface 13.
Thereby, the light L1 which is reflected from the bulb 11 directly or by the first reflecting surface 12 and goes to the first projection lens 14 is not disturbed by the movable shutter 18, and the second reflecting surface directly from the bulb 11. Light L <b> 2 directed to 13 is blocked by the movable shutter 18 located at the first position A.

Further, at the second position B, the movable shutter 18 is largely swung forward, so that the tip of the movable shutter 18 is reflected directly from the bulb 11 or by the first reflecting surface 12 and the first projection lens. 14 is withdrawn from the optical path of the light L <b> 1 toward 14.
Thereby, the light L1 which is reflected from the bulb 11 directly or by the first reflecting surface 12 and goes to the first projection lens 14 is not disturbed by the movable shutter 18, and the second reflecting surface directly from the bulb 11. The light L <b> 2 directed to 13 is not blocked by the movable shutter 18.

Furthermore, at the third position C, the movable shutter 18 has a distal end disposed substantially vertically on the upper side of the first reflecting surface 12 near the second focal position F2.
Thereby, the light L1 reflected directly from the bulb 11 or reflected by the first reflecting surface 12 and directed to the first projection lens 14 is partially blocked by the movable shutter 18 and also directly from the bulb 11 to the second. The light L <b> 2 traveling toward the reflecting surface 13 is not blocked by the movable shutter 18.

  The vehicle headlamp 10 according to the embodiment of the present invention is configured as described above, and light is emitted from the light emitting portion of the bulb 11 when the bulb 11 is supplied with power from the socket and emits light.

  Here, when the movable shutter 18 is positioned at the first position A, a part of the light L1 out of the light L emitted from the bulb 11 is reflected directly or by the first reflecting surface 12. Then, the light is focused toward the second focal position F2, and further irradiated forward through the first projection lens 14. At that time, the light L1 forms a cut-off line by the first fixed shutter 16, and is irradiated forward, for example, with a light distribution pattern of a passing beam.

  Of the light L emitted from the bulb 11, the light L <b> 2 going toward the second reflecting surface 13 is blocked by the movable shutter 18 located at the first position A. Accordingly, the light from the bulb 11 does not enter the second reflecting surface 13, so that no light is irradiated forward from the second reflecting surface 13 through the second projection lens 15.

  In this way, when the movable shutter 18 is located at the first position A, light is emitted forward only from the first reflecting surface 12 via the first projection lens 14, and the first By forming a cut-off line by the fixed shutter 16, a low beam is irradiated.

  On the other hand, when the movable shutter 18 is located at the second position B, a part of the light L1 out of the light L emitted from the bulb 11 is directly or first reflected in the same manner. 12, and is focused toward the second focal position F <b> 2, and further irradiated forward through the first projection lens 14. At this time, a cut-off line is formed by the first fixed shutter 16. Thus, for example, the light is emitted forward in a light distribution pattern of a passing beam.

  Further, among the light L emitted from the bulb 11, the light L <b> 2 going toward the second reflecting surface is not blocked by the movable shutter 18 because the movable shutter 18 is located at the second position B. , Enters the second reflecting surface 13. The light L2 reflected by the second reflecting surface 13 is converged toward the second focal position F3, and further irradiated forward through the second projection lens 15. At that time, the light L2 forms a cut-off line by the second fixed shutter 17, and is irradiated forward, for example, with a light distribution pattern of a traveling beam.

In this way, when the movable shutter 18 is located at the second position B, a low beam is emitted forward from the first reflecting surface 12 via the first projection lens 14. The traveling beam is irradiated forward from the second reflecting surface 13 through the second projection lens 15.
Thereby, in addition to the above-mentioned passing beam when the movable shutter 18 is located at the first position A, the traveling beam is irradiated by the second projection lens 15.

When the movable shutter 18 is located at the third position C, a part of the light L1 emitted from the bulb 11 is reflected directly or by the first reflecting surface 12, The light is focused toward the second focal position F2, and further irradiated forward through the first projection lens.
At that time, of the light irradiated forward through the first projection lens 14 by the movable shutter 18 at the third position C in the vicinity of the second focal position F2 that is most focused. The light in the vicinity of the lower edge, that is, the light irradiated toward the front side of the automobile is blocked, so that the illuminance of the low beam described above is reduced.

  Further, among the light L emitted from the bulb 11, the light L <b> 2 going toward the second reflecting surface is not blocked by the movable shutter 18 because the movable shutter 18 is located at the second position B. , Enters the second reflecting surface 13. The light L2 reflected by the second reflecting surface 13 is converged toward the second focal position F3, and further irradiated forward through the second projection lens 15. At that time, the light L2 forms a cut-off line by the second fixed shutter 17, and is irradiated forward, for example, with a light distribution pattern of a traveling beam.

In this way, when the movable shutter 18 is located at the third position C, a low beam is irradiated forward from the first reflecting surface 12 via the first projection lens 14. The traveling beam is irradiated forward from the second reflecting surface 13 through the second projection lens 15 and forward from the second reflecting surface through the second projection lens. In this case, for example, the illuminance of the low beam described above is reduced, and for example, a traveling beam is irradiated by the second projection lens.
In this case, compared with the case where the movable shutter 18 is positioned at the second position B, a part of the passing beam is blocked by the movable shutter 18 as described above, so that By reducing the illuminance, the visibility in the distance is further improved particularly during high-speed driving and bad weather.

[Example 2]
FIG. 2 shows a configuration of a second embodiment of the vehicle headlamp according to the present invention.
2, since the vehicle headlamp 20 has substantially the same configuration as the vehicle headlamp 10 shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.
The vehicle headlamp 20 is different from the vehicle headlamp 10 shown in FIG. 1 only in that a movable shutter 21 is provided instead of the movable shutter 18.

  Here, the movable shutter 21 is at a height position between the first reflecting surface 12 and the second reflecting surface 13, as shown in FIG. These are disposed in front of each other, and in the illustrated case, are supported so as to be swingable around a rotation shaft 22 fixedly disposed so as to extend laterally with respect to the optical axes O and O2.

  The movable shutter 21 can be moved from a first position indicated by reference numeral A to a second position indicated by reference numeral B or a third position indicated by reference numeral C by driving means (not shown).

Here, the movable shutter 21 is formed to have the same elliptical surface shape as that of the first reflecting surface 12 at the first position A, and at the first position A to the valve 11. The opposing concave inner surface is configured as a reflecting surface, and optically shields between the first reflecting surface 12 and the second reflecting surface 13.
Thereby, the light L1 which is reflected from the bulb 11 directly or by the first reflecting surface 12 and goes to the first projection lens 14 is not disturbed by the movable shutter 21, and is directly from the bulb 11 to the second reflecting surface. Light L <b> 2 going to 13 is also reflected by the movable shutter 21 at the first position A and focused toward the vicinity of the second focal position F <b> 2 of the first reflecting surface 12. .

Further, at the second position B, the movable shutter 21 is largely swung to the front side, so that the tip thereof is reflected directly from the bulb 11 or by the first reflecting surface 12 and the first projection lens. 14 is withdrawn from the optical path of the light L <b> 1 toward 14.
Thereby, the light L1 which is reflected from the bulb 11 directly or by the first reflecting surface 12 and goes to the first projection lens 14 is not disturbed by the movable shutter 21, and is directly from the bulb 11 to the second reflecting surface. The light L <b> 2 going to 13 is not blocked by the movable shutter 21.

Further, at the third position C, the tip of the movable shutter 21 is disposed on the upper side of the first reflecting surface 12 near the second focal position F2.
As a result, the light L1 that is reflected directly from the bulb 11 or reflected by the first reflecting surface 12 and directed to the first projection lens 14 is partially blocked by the movable shutter 21 and also directly from the bulb 11 to the second. The light L <b> 2 directed toward the reflecting surface 13 is not blocked by the movable shutter 21.

  According to the vehicle headlamp 20 having such a configuration, similarly to the vehicle headlamp 10 described above, the bulb 11 is supplied with power from the socket and emits light, whereby light is emitted from the light emitting portion of the bulb 11. Will be.

Here, when the movable shutter 21 is located at the first position A, a part of the light L 1 out of the light L emitted from the bulb 11 is reflected directly or by the first reflecting surface 12. Then, the light is focused toward the second focal position F2, and further irradiated forward through the first projection lens 14.
Of the light L emitted from the bulb 11, the light L2 going to the second reflecting surface 13 is reflected in the same manner as the light L1 by the movable shutter 21 located at the first position A, and The light is converged toward the vicinity of the second focal position F <b> 2 of the one reflecting surface 12, and irradiated forward through the first projection lens 14.
At that time, the lights L1 and L2 are cut off by the first fixed shutter 16, and are irradiated forward with a light distribution pattern of a low beam, for example.

In this way, when the movable shutter 21 is located at the first position A, light is irradiated forward only from the first reflecting surface 12 via the first projection lens 14, and the first By forming a cut-off line by the fixed shutter 16, a low beam is irradiated.
In this case, since the light L2 incident on the movable shutter 21 located at the first position A is also irradiated forward as a passing beam, the use efficiency of the light emitted from the bulb 11 is improved, and a brighter illuminance passing is performed. A beam will be obtained.

  On the other hand, when the movable shutter 21 is located at the second position B, a part of the light L1 out of the light L emitted from the bulb 11 is directly or first reflected in the same manner. 12, and is focused toward the second focal position F <b> 2, and further irradiated forward through the first projection lens 14. At this time, a cut-off line is formed by the first fixed shutter 16. Thus, for example, the light is emitted forward in a light distribution pattern of a passing beam.

  Of the light L emitted from the bulb 11, the light L <b> 2 going toward the second reflecting surface is not blocked by the movable shutter 21 because the movable shutter 21 is located at the second position B. , Enters the second reflecting surface 13. The light L2 reflected by the second reflecting surface 13 is converged toward the second focal position F3, and further irradiated forward through the second projection lens 15. At that time, the light L2 forms a cut-off line by the second fixed shutter 17, and is irradiated forward, for example, with a light distribution pattern of a traveling beam.

In this way, when the movable shutter 21 is located at the second position B, a low beam is irradiated forward from the first reflecting surface 12 via the first projection lens 14. The traveling beam is irradiated forward from the second reflecting surface 13 through the second projection lens 15.
Thereby, in addition to the above-mentioned passing beam when the movable shutter 21 is located at the first position A, the traveling beam is irradiated by the second projection lens 15.

When the movable shutter 21 is located at the third position C, a part of the light L1 emitted from the bulb 11 is reflected directly or by the first reflecting surface 12, The light is focused toward the second focal position F2, and further irradiated forward through the first projection lens.
At that time, of the light irradiated forward through the first projection lens 14 by the movable shutter 21 at the third position C in the vicinity of the second focal position F2 that is most focused. The light in the vicinity of the lower edge, that is, the light irradiated toward the front side of the automobile is blocked, so that the illuminance of the low beam described above is reduced.

  Of the light L emitted from the bulb 11, the light L <b> 2 going toward the second reflecting surface is not blocked by the movable shutter 21 because the movable shutter 21 is located at the second position B. , Enters the second reflecting surface 13. The light L2 reflected by the second reflecting surface 13 is converged toward the second focal position F3, and further irradiated forward through the second projection lens 15. At that time, the light L2 forms a cut-off line by the second fixed shutter 17, and is irradiated forward, for example, with a light distribution pattern of a traveling beam.

In this way, when the movable shutter 21 is located at the third position C, a low beam is emitted forward from the first reflecting surface 12 via the first projection lens 14. The traveling beam is irradiated forward from the second reflecting surface 13 through the second projection lens 15 and forward from the second reflecting surface through the second projection lens. In this case, for example, the illuminance of the low beam described above is reduced, and for example, a traveling beam is irradiated by the second projection lens.
In this case, compared to the case where the movable shutter 21 is positioned at the second position B, a part of the passing beam is blocked by the movable shutter 21 as described above, so that By reducing the illuminance, the visibility in the distance is further improved particularly during high-speed driving and bad weather.

  In each of the above-described embodiments, the movable shutters 18 and 21 are supported so as to be swingable around the rotation shafts 19 and 22, respectively, and the first position A and the second position B are driven by driving means (not shown). However, the present invention is not limited to this, and the movable shutters 18 and 21 are moved along the arbitrary movement path using, for example, a cam or the like to the first position A. , The second position B and the third position C may be moved.

As described above, according to the present invention, by using a single light source and moving the movable shutter from the first position to the second position or the third position, only the passing beam and the traveling beam are used. In particular, a light distribution pattern with a low illuminance in front of the automobile can be formed especially during high-speed driving or in bad weather, so that the visibility is further improved.
In this way, according to the present invention, the front of the vehicle equipped with an extremely excellent movable shutter that can reduce the illuminance in front of the vehicle, for example, when traveling at high speed or in bad weather, with a simple configuration. A lighting can be provided.

1 is a schematic cross-sectional view along the optical axis showing the configuration of a first embodiment of a vehicle headlamp according to the present invention. It is a schematic sectional drawing along the optical axis which shows the structure of 2nd embodiment of the vehicle headlamp by this invention. It is a schematic sectional drawing which shows the structure of an example of the conventional vehicle headlamp. It is a schematic front view of the vehicle headlamp of FIG.

Explanation of symbols

10 Vehicle headlights 11 Bulb (light source)
DESCRIPTION OF SYMBOLS 12 1st reflective surface 13 2nd reflective surface 14 1st projection lens 15 2nd projection lens 16 1st fixed shutter 17 2nd fixed shutter 18 Movable shutter 19 Rotating shaft 20 Vehicle headlamp 21 Movable shutter 22 Rotating shaft

Claims (9)

A light source;
Arranged so that the first focal position is located near the light source and the second focal position is located on the optical axis of the light source extending substantially horizontally forward so that the light from the light source is reflected forward A first ellipsoidal reflecting surface that is concave toward the front,
Convex-shaped first arranged in front of the first reflecting surface and on the optical axis of the light source so that the focal position on the light source side is located near the second focal position on the first reflecting surface. A projection lens,
The first focal position is located near the light source and the second focal position is located above the second focal position of the first reflecting surface so as to reflect light from the light source forward. The second reflecting surface of the elliptical system concave toward the front disposed on the upper side of the first reflecting surface,
In front of the second reflecting surface, the position on the light source side is in the vicinity of the second focal position of the second reflecting surface on an axis extending substantially horizontally forward through the second focal position. A convex second projection lens arranged to be located;
A movable shutter movably disposed between the first reflecting surface and the second reflecting surface;
With
A first position where the movable shutter blocks light from the light source toward the second reflecting surface and does not interfere with light reflected by the first reflecting surface and traveling to the first projection lens; A second position that does not block light traveling toward the second reflecting surface and that does not block light reflected by the first reflecting surface and traveling to the first projection lens; and further, light traveling from the light source toward the second reflecting surface. A third position that blocks light that is reflected from the first reflecting surface and travels to the first projection lens and that is irradiated forward through the first projection lens. A vehicle headlamp, characterized in that   2. The vehicle headlamp according to claim 1, wherein when the movable shutter is at the third position, the movable shutter is located near the second focal position of the first reflecting surface. 3.   The vehicle headlamp according to claim 1 or 2, wherein the movable shutter is biased to return to the first position by a spring.   The vehicle headlamp according to any one of claims 1 to 3, wherein the movable shutter is supported so as to be swingable about a rotation shaft extending in a lateral direction.   The vehicle headlamp according to any one of claims 1 to 3, wherein the movable shutter is supported so as to be movable along a desired movement curve.   6. The movable shutter according to claim 1, wherein the movable shutter is configured as a plane, and is disposed substantially horizontally at the first position and substantially vertically at the third position. Vehicle headlamp as described in   6. The movable shutter according to claim 1, wherein the movable shutter is formed so as to constitute a part of an elliptical shape constituting the first reflecting surface at the first position. The vehicle headlamp described in Crab.   The vehicle headlamp according to claim 7, wherein a surface of the movable shutter facing the light source at the first position is configured as a reflecting surface.   The movable shutter is disposed in the vicinity of a second focal position of the first reflecting surface, and a first fixed shutter for forming a predetermined cut-off line and / or a second of the second reflecting surface. The vehicle headlamp according to any one of claims 1 to 8, further comprising: a second fixed shutter that is disposed in the vicinity of the focal position of the second fixed shutter to form a predetermined cutoff line.

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