JP2006080018A - Vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture which can be constituted small-sized and light-weighted without the occurrence of color separation with a simple configuration. <P>SOLUTION: The vehicular lighting fixture is constituted so as to include a recessed first reflecting face 12 facing forward in which a first focus position F1 is positioned in the neighborhood of a light source 11 and in which a second focus position F2 is composed of a composite elliptic face of the lower side from the optical axis arranged on the optical axis O on the front side, a recessed second reflecting face 13 facing forward in which similarly, a second focus position F3 is arranged forwardly than the second focus position F2 and its focus position is composed of the composite elliptic face of the upper side from the optical axis, a recessed third reflecting 15 facing forward in which that focus position is arranged at the second focus position F3 below the first reflecting face and which is composed of a rotational paraboloid, and a flat reflecting face 14 which is extended from the edge line 14a horizontally crossing the second focus position of the second reflecting face toward the upper side and is extended diagonally backward. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

Conventionally, such a headlight of an automobile is disclosed in, for example, Patent Document 1 and is configured as shown in FIG.
That is, in FIG. 6, a headlamp 1 is a projector-type automobile headlamp, and includes a bulb 2 as a light source, a reflecting surface 3 that reflects light from the bulb 2 forward, and a bulb 2 or The projection lens 4 is configured to focus the light from the reflecting surface 3, and the shutter 5 is provided in the optical path from the bulb 2 to the projection lens 4 to form a cutoff.

により定義されるものであって、ｚ−ｙ断面にて長径ａを，ｚ−ｘ断面にて長径ｂを有しており、回転楕円面（ａ＝ｂ）を含んでいる。
上記投影レンズ４は、凸レンズであって、そのバルブ２側の焦点が、上記反射面３の第二の焦点位置Ｆ２付近に位置するように配置されている。
また、上記シャッタ５は、上記反射面３の第二焦点及び投影レンズ４のバルブ２側の焦点が重なった位置付近に配置されている。 The reflecting surface 3 is composed of a composite ellipsoidal surface, has a first focal point F1 in the vicinity of the bulb 2, and is arranged so that its long axis is located along the optical axis of the bulb 2.
Here, the composite ellipsoid is

And has a major axis a in the yz section and a major axis b in the zx section, and includes a spheroid (a = b).
The projection lens 4 is a convex lens, and is arranged so that the focal point on the bulb 2 side is located near the second focal position F2 of the reflecting surface 3.
The shutter 5 is disposed in the vicinity of the position where the second focal point of the reflecting surface 3 and the focal point on the bulb 2 side of the projection lens 4 overlap.

According to the headlamp 1 having such a configuration, the light emitted from the bulb 2 is reflected directly or by the reflection surface 3 and enters the projection lens 4, and is converged by the projection lens 4. Irradiated towards.
At that time, a part of the light incident on the projection lens 4 is blocked by the shutter 5, so that a desired light distribution characteristic that shortens the irradiation distance on the oncoming lane side so as not to give the oncoming vehicle dazzling light As a result, a so-called passing beam is formed.
JP-A-5-347101

By the way, in the headlamp 1 having such a configuration, as shown in FIG. 6, the projection lens 4 is provided over the entire range where the light is emitted, and the rear surface of the projection lens 4 is flat. The front surface is formed in a convex shape.
For this reason, since the entire headlamp 1 has a configuration that is long in the front-rear direction, the installation position is limited when it is installed in the front part of the vehicle body, and the projection lens 4 itself is made of glass. Because of this, coupled with its size, it becomes heavier.
Further, since the projection lens 4 is a so-called single lens, chromatic aberration occurs, and color separation may be caused by the cutoff by the shutter 5.

On the other hand, as shown in FIG. 7, the bulb 2, the reflecting surface 3, and the shutter 5 are arranged in the reverse direction, and a reflecting mirror 6 is provided instead of the projection lens 4 at a position facing the bulb 2, thereby reflecting the light. It is also conceivable to irradiate light forward by reflecting the composite ellipsoidal reflection by the surface 3 by the reflecting mirror 6.
However, in such a configuration, a part of the light imaged and reflected by the reflecting mirror 6 is blocked by the reflecting surface 3 as it travels toward the reflecting surface 3 on the light source side. Accordingly, the amount of light irradiated forward is reduced, and it becomes difficult to obtain a normal amount of irradiation light.

For this reason, as shown in FIG. 8, the bulb 2 and the reflecting surface 3 are shifted obliquely upward, and the light reflected from the bulb 2 by the reflecting surface 3 is image-reflected forward by the reflecting mirror 6. It is also possible.
However, in such a configuration, the entire headlamp becomes large in the vertical direction, and therefore, the assembling position is similarly limited when assembling into the front of the vehicle body of the automobile.

  In view of the above, an object of the present invention is to provide a vehicular lamp that can be configured to be small and lightweight with a simple configuration without causing color separation.

  According to the configuration of the present invention, the first focus position is located near the light source and the second focus position is on the front side so that the light from the light source and the light from the light source are reflected forward. A first reflecting surface that is concave forward from the optical axis that is located on the optical axis of the light source and that is composed of a compound ellipse on the lower side, and reflects light from the light source forward In addition, the composite ellipse above the optical axis is arranged such that the first focal position is located near the light source and the second focal position is located in front of the second focal position of the first reflecting surface. A second reflecting surface which is concave forwardly formed from a surface, and the focal position of the second reflecting surface below the first reflecting surface or above the second reflecting surface is the second reflecting surface of the second reflecting surface. A third reflection that is concave forward and consists of a rotating paraboloid located at the focal point. And a plane reflecting surface disposed so as to extend obliquely backward or obliquely upward from an edge line horizontally traversing the second focal position of the second reflecting surface. This is achieved by a vehicular lamp.

  In the vehicular lamp according to the present invention, preferably, the second focal position of the second reflecting surface corresponds to the size of the light emitting portion of the light source with respect to the second focal position of the first reflecting surface. It is located forward by the distance.

  In the vehicular lamp according to the present invention, preferably, the planar reflecting surface has an inclination angle of 45 ° ± 20 °.

  In the vehicle lamp according to the present invention, preferably, the vicinity of the edge of the edge line passing through the optical axis of the plane reflecting surface is masked.

  In the vehicular lamp according to the present invention, the masking is preferably formed by painting.

  In the vehicle lamp according to the present invention, preferably, the masking is constituted by a light shielding member.

According to the above configuration, the light emitted from the light source is reflected directly or by the first reflecting surface, converged toward the second focal position, and further irradiated forward.
In addition, a part of the light reflected by the first reflecting surface is focused near the second focal position and incident on the planar reflecting surface, and is reflected toward the third reflecting surface by the planar reflecting surface. The
And the light which injected into the 3rd reflective surface is reflected in parallel with an optical axis toward the front, and is irradiated toward the front. As a result, the edge line of the plane reflecting surface is projected forward and enlarged by the third reflecting surface, so that a cut-off line is formed by the projection image of the edge line, and so-called light distribution characteristics of the passing beam. Will be obtained.

Here, the second focal position of the second reflecting surface arranged on the upper side is positioned in front of the second focal position of the first reflecting surface arranged on the lower side, so that the first More light reflected by the reflecting surface is guided to the planar reflecting surface, and the amount of light reflected by the planar reflecting surface increases.
Therefore, as with conventional projector-type vehicle lamps, by projecting a cut-off line, a light distribution characteristic of a passing beam can be obtained, and a convex lens is not used. Since no deviation occurs and a lens made of relatively heavy glass is not used, the whole can be made light. Furthermore, since there is no lens that projects forward, the size in the front-rear direction can be reduced, and the size can be reduced, and the degree of freedom of arrangement with respect to the front of the vehicle body of the automobile is increased.

  When the second focal position of the second reflecting surface is located forward of the second focal position of the first reflecting surface by a distance corresponding to the size of the light emitting part of the light source. In this case, the amount of light incident on the planar reflecting surface among the light reflected by the first reflecting surface is further increased.

  When the planar reflecting surface has an inclination angle of 45 ° ± 20 °, the light incident on the planar reflecting surface is more efficiently guided to the third reflecting surface.

  When the edge on the second focal position side of the second reflecting surface of the planar reflecting surface is preferably masked by a paint or a light shielding member, the cut off by the edge line of the planar reflecting surface becomes clearer. Can be formed.

  Thus, according to the present invention, the edge line of the planar reflecting surface is projected forward by the third reflecting surface made of the paraboloid of revolution instead of the projection lens made of the convex lens. Compared with projector-type vehicular lamps that use conventional projection lenses, it can be made compact, particularly in the front-rear direction, and the overall configuration is lightweight, providing a greater degree of freedom in the arrangement of the front of the vehicle body In addition, since no lens is used, no color shift due to chromatic aberration of the lens occurs.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
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.

FIG.1 and FIG.2 has shown the structure of 1st embodiment of the vehicle lamp by this invention.
In FIG. 1, a vehicular lamp 10 is a headlight of an automobile, and includes a bulb 11 as a light source, a first reflecting surface 12 that reflects light from the bulb 11 forward, and a second reflection. A surface 13, a flat reflecting surface 14 disposed in front of the bulb 11 and facing backward, and a third reflecting surface 15 that reflects light reflected from the flat reflecting surface 14 forward. Has been.

  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. Used, fixed and held by the socket, and 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 as shown in FIG. The second focal position F2 is located in the vicinity of the optical axis O extending forward from the bulb 11 on the front side. It is composed of a complex ellipsoid.

The second reflecting surface 13 is formed in a concave shape toward the front so as to reflect the light from the bulb 11 forward, and as shown in FIG. The optical axis so that the second focal position F3 is located near the optical axis O in front of the second focal position F2 of the first reflecting surface 12 by a predetermined distance d. It is composed of a composite ellipsoid (including a spheroidal ellipsoid) arranged only on the upper side from O.
Here, the predetermined distance d is determined in accordance with the size of the light emitting part of the bulb 11 which is a light source. As a result, of the light emitted from the light emitting portion of the bulb 11, the light reflected by the first reflecting surface 12 is effectively incident on the planar reflecting surface 14.

As shown in FIG. 2, the planar reflecting surface 14 extends obliquely rearward from the edge line 14a that horizontally crosses the second focal position F3 of the second reflecting surface 13 toward the upper side. It is arranged only on the upper side.
Here, the plane reflecting surface 14 may be a plane, but is preferably formed in a triangular prism shape having a predetermined apex angle, and its front surface is arranged perpendicular to the optical axis O. The slope behind it acts as a plane reflecting surface. As a result, the planar reflecting surface is disposed so as to be inclined by the same angle as the apex angle.

The inclination angle of the planar reflecting surface 14 is selected so that the reflected light is effectively incident on the third reflecting surface 15 according to the shape and size of the third reflecting surface 15 described later. The
The inclination angle of the planar reflecting surface 14 is selected to be, for example, 45 ° ± 20 °, preferably about 60 ° with respect to the optical axis. In this case, the inclination angle is an angle with respect to the optical axis O behind the edge line 14a.

  The third reflective surface 15 is formed in a concave shape toward the front, and the first reflective surface is so positioned that the focal position is located at the second focal position F3 of the second reflective surface 13. It is comprised only from the lower area | region of the paraboloid of revolution.

  The vehicular lamp 10 according to the embodiment of the present invention is configured as described above. When the bulb 11 is supplied with power from the socket and emits light, the light emitted from the light emitting portion of the bulb 11 can be directly or first. The light is reflected by the reflecting surface 12 and the second reflecting surface 13, converged toward the second focal points F2 and F3, and further irradiated forward.

  Further, a part of the light reflected by the first reflecting surface 12 is focused on the vicinity of the second focal position F2, and then enters the planar reflecting surface 14. At that time, since the second focal position F2 of the first reflective surface 12 is located behind the second focal position F3 of the second reflective surface 12 and the planar reflective surface 14, the first reflective surface Twelve reflected lights are efficiently incident on the planar reflecting surface 14.

  Then, the light incident on the planar reflecting surface 14 is reflected by the planar reflecting surface 14 and travels toward the third reflecting surface 15. Then, the light incident on the third reflecting surface 15 is reflected substantially parallel to the optical axis O toward the front based on the reflection / focusing action of the third reflecting surface 15 and irradiated toward the front. Is done.

  At that time, the edge line 14a of the planar reflecting surface 14 is projected to be enlarged forward by the third reflecting surface 15, and the projected image of the edge line 14a forms a cut-off line. The light distribution characteristic of the passing beam can be obtained.

In this case, the edge line 14a of the planar reflecting surface 14 is projected by being enlarged forward by the third reflecting surface 15, whereby a projector-type vehicular lamp having a light distribution characteristic of a passing beam is obtained. It will be.
Therefore, unlike the conventional projector-type vehicle lamp 1 shown in FIG. 6, the projection lens 4 protruding forward is not provided. Therefore, according to the vehicle lamp 10 according to the embodiment of the present invention, The size can be small and the size can be reduced, and the degree of freedom of arrangement in the front of the vehicle body of the automobile is increased.
Further, since there is no lens made of glass, the entire vehicular lamp 10 is lightweight, and there is no chromatic aberration due to the lens, so there is no color shift in the cut-off line, and a clear cut-off line is formed. Will be able to.

3 and 4 show the configuration of the second embodiment of the vehicular lamp according to the present invention.
In FIG. 3, the vehicular lamp 20 has the same configuration as the vehicular lamp shown in FIG. 1, and thus the same components are denoted by the same reference numerals and description thereof is omitted.
The vehicular lamp 20 is an automobile headlamp, and 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, The flat reflection surface 24 is disposed facing the rear in front of the bulb 11 and a third reflection surface 25 that reflects the reflected light from the flat reflection surface 24 forward.

As shown in FIG. 4, the plane reflecting surface 24 extends obliquely forward from the edge line 24a horizontally traversing the second focal position F3 of the second reflecting surface 13 toward the upper side. It is arranged only on the upper side.
Here, the plane reflecting surface 24 is preferably formed in a triangular prism shape having a predetermined apex angle, and the front surface thereof is arranged perpendicular to the optical axis O, so that the inclined surface behind it. Acts as a planar reflecting surface. As a result, the planar reflecting surface is disposed so as to be inclined by the same angle as the apex angle.

The inclination angle of the planar reflecting surface 24 is similar to that of the planar reflecting surface 24 described above, and the reflected light with respect to the third reflecting surface 25 corresponds to the shape and size of the third reflecting surface 25 described later. Are selected so as to be effectively incident.
The inclination angle of the planar reflecting surface 24 is selected to be, for example, 45 degrees ± 20 degrees, preferably about 60 degrees with respect to the optical axis.
However, the inclination angle of the planar reflecting surface 24 is an angle with respect to the optical axis O ahead from the edge line 24a, unlike the planar reflecting surface 14 described above.

  The third reflective surface 25 is formed in a concave shape toward the front, and the first reflective surface is arranged such that the focal position thereof is located at the second focal position F3 of the second reflective surface 13. It consists of a paraboloid of revolution only in the upper region.

  According to the vehicular lamp 20 having such a configuration, the light emitted from the bulb 11 is directly or the first reflecting surface 12 and the second reflecting surface 13 as in the case of the vehicular lamp 10 described above. Are reflected toward the second focal points F2 and F3, and further irradiated forward.

  Further, a part of the light reflected by the first reflecting surface 12 is focused near the second focal position F2, and then enters the planar reflecting surface 24, and is reflected by the planar reflecting surface 24 to be reflected by the third reflecting surface 24. Then, the light travels toward the reflecting surface 25, and is reflected forward and substantially parallel to the optical axis O based on the reflection / focusing action of the third reflecting surface 25, and is irradiated forward.

  Then, the edge line 24a of the planar reflecting surface 24 is enlarged forward by the third reflecting surface 25 and projected as a cut-off line, so that a so-called passing beam light distribution characteristic is obtained.

  In the case of the vehicular lamp 20 according to the second embodiment of the present invention, the light distribution characteristics of the vehicular lamp 10 according to the first embodiment can be adjusted more easily. Therefore, it is effective when it is desirable that the third reflecting surface is located below the first reflecting surface.

  In each of the embodiments described above, the planar reflecting surfaces 14 and 24 are simply formed in a triangular prism shape, and the edge lines 14a and 24a at the lower edges thereof are directed forward by the third reflecting surfaces 15 and 25. By projecting in an enlarged manner, a cut-off line is formed. However, the present invention is not limited to this, and the planar reflecting surface 14 is masked along the vicinity of the lower edge thereof as shown in FIG. 16 and the planar reflecting surface 24 may each be provided with a masking 26 along the vicinity of the lower edge thereof, as shown in FIG.

In this case, the masking 16 and 26 are arranged so that the upper edges thereof are edge lines 16a and 26a so as to cross the second focal position F3 of the second reflecting surface 13 on the optical axis O, respectively.
As a result, when the planar reflecting surfaces 14 and 24 are projected forward and enlarged by the third reflecting surfaces 15 and 25, respectively, the upper edges of the masking 16 and 26 are formed as cut-off lines. Become.

Then, the cut-off line is formed by the upper edges of the masking 16 and 26, so that a clearer cut-off line can be formed as compared with the case of the cut-off line by the lower edges of the planar reflecting surfaces 14 and 24. .
Here, the masking 16, 26 can be easily configured by providing, for example, a coating, a light shielding member, or the like in the vicinity of the lower edge of the inclined surface of the planar reflecting surfaces 14, 24.
The masking 16 and 26 may be configured with clear edge lines, and may be configured with a step, for example.

  In the above-described embodiment, the planar reflecting surfaces 14 and 24 are each configured as a triangular prism. However, the present invention is not limited to this, and any plane may be used as long as it includes a flat reflecting surface inclined with respect to the optical axis O. Obviously, it can be formed into a shape.

As described above, according to the present invention, the edge line of the planar reflecting surface is projected forward by the third reflecting surface made of the rotating paraboloid instead of the projection lens made of the convex lens. Therefore, compared with a projector-type vehicular lamp using a conventional projection lens, it can be configured in a particularly small size in the front-rear direction, and is configured to be lightweight as a whole. Since the lens becomes larger and no lens is used, there is no occurrence of color shift due to chromatic aberration of the lens.
As described above, according to the present invention, it is possible to provide an extremely excellent vehicular lamp that can be configured to be small and lightweight with a simple configuration without causing color separation.

It is a schematic sectional drawing in alignment with the optical axis which shows the structure of 1st embodiment of the vehicle lamp by this invention. It is a partial expanded sectional view which shows the structure of the principal part of the vehicle lamp of FIG. It is a schematic sectional drawing along the optical axis which shows the structure of 2nd embodiment of the vehicle lamp by this invention. It is a partial expanded sectional view which shows the structure of the principal part of the vehicle lamp of FIG. It is a fragmentary sectional view which shows the modification of the plane reflective surface in the vehicle lamp of FIG.1 and FIG.3. It is a schematic sectional drawing which shows the structure of an example of the conventional vehicle lamp. It is a schematic sectional drawing which shows the structure of the other example of the conventional vehicle lamp. It is a schematic sectional drawing which shows the structure of the further another example of the conventional vehicle lamp.

Explanation of symbols

10, 20 Vehicle lamp 11 Bulb (light source)
12 First Reflecting Surface 13 Second Reflecting Surface 14 Planar Reflecting Surface 14a Edge Line 15 Third Reflecting Surface 16 Masking 24 Planar Reflecting Surface 24a Edge Line 25 Third Reflecting Surface 26 Masking

Claims (6)

A light source;
Light arranged such 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 on the front side so as to reflect light from the light source forward. A first reflecting surface that is concave forward from the lower composite ellipsoidal surface, and a first focal position is located near the light source so as to reflect light from the light source forward, and A second reflecting surface that is concave forward from the optical axis and is composed of an upper composite ellipsoidal surface arranged so that the second focal position is located in front of the second focal position of the first reflecting surface; ,
The rotating paraboloid is arranged below the first reflecting surface or above the second reflecting surface so that its focal position is located at the second focal position of the second reflecting surface. A third reflecting surface concave toward the front;
A plane reflecting surface arranged to extend diagonally backward or diagonally forward from an edge line horizontally traversing the second focal position of the second reflecting surface;
A vehicular lamp characterized by comprising:   The second focal position of the second reflecting surface is located forward of the second focal position of the first reflecting surface by a distance corresponding to the size of the light emitting part of the light source. The vehicular lamp according to claim 1, wherein the vehicular lamp is characterized.   The vehicular lamp according to claim 1, wherein the planar reflecting surface has an inclination angle of 45 ° ± 20 °.   The vehicular lamp according to any one of claims 1 to 3, wherein the vicinity of an edge of an edge line passing through the optical axis of the plane reflecting surface is masked.   The vehicular lamp according to claim 4, wherein the masking is formed by painting.   The vehicular lamp according to claim 4, wherein the masking is made of a light shielding member.

Images