JP2013239273A - Vehicle lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector type vehicle lamp in which irradiation in side directions is enabled without any restriction in a lamp structure.SOLUTION: A vehicle lamp is so structured that an additional reflector 40 for reflecting light from a light source 22a toward a rear face 26b of a projection lens 26 may be located at a position on a more front side than the rear face 26b in a periphery of the projection lens 26. With this, reflection light from the additional reflector 40 is made incident to the projection lens 26 from its front face 26a and is reflected on the inner surface in its rear face 26b and is emitted frontward from its front face 26a, and this emitted light is used as side-direction irradiation light. Since this side-direction irradiation light becomes emitted light from the front face 26a of the projection lens 26, irradiation in side directions is enabled without any restriction to a lamp structure.

Description

  The present invention relates to a projector-type vehicular lamp.

  In general, a projector-type vehicular lamp is configured to reflect light from a light source disposed behind a projection lens toward the projection lens by a reflector.

  In “Patent Document 1”, in such a projector-type vehicle lamp, between the reflector and the projection lens, an additional reflector that reflects the direct light directed inward in the vehicle width direction from the light source toward the outer side in the vehicle width direction. And a prism-like lens that refracts reflected light from the additional reflector to the front side of the lamp is described.

  In the vehicular lamp described in “Patent Document 1”, an additional reflector and a prism-like lens are used for a basic light distribution pattern formed by controlling light from a light source with a reflector and a projection lens. An additional light distribution pattern formed by controlled light is added to the side end portion.

JP 2005-322460 A

  By adopting the lamp configuration described in the “Patent Document 1”, it is possible to improve the side visibility of the road surface ahead of the vehicle.

  However, in such a lamp configuration, since side irradiation light is irradiated from the space between the reflector and the projection lens, it may be difficult to perform such light irradiation depending on the lamp structure. There is.

  The present invention has been made in view of such circumstances, and provides a vehicular lamp that can perform side illumination without being restricted by the lamp structure in a projector-type vehicular lamp. It is the purpose.

  The present invention is intended to achieve the above object by adopting a configuration in which side projection is performed using a projection lens.

That is, the vehicular lamp according to the present invention is
In a vehicle lamp comprising: a projection lens; a light source disposed behind the projection lens; and a reflector that reflects light from the light source toward the projection lens.
An additional reflector that reflects light from the light source toward the rear surface of the projection lens is disposed at a position ahead of the rear surface of the projection lens around the projection lens. is there.

  The type of the “light source” is not particularly limited, and for example, a light emitting portion of a discharge bulb, a filament of a halogen bulb, or a light emitting surface of a light emitting diode can be employed.

  The above-mentioned “additional reflector” has a specific arrangement as long as it can reflect the light from the light source toward the rear surface of the projection lens at a position in front of the rear surface around the projection lens. The shape of the reflecting surface and the like are not particularly limited.

  As shown in the above configuration, the vehicular lamp according to the present invention is configured as a projector-type vehicular lamp, but with an additional reflector disposed at a position ahead of the rear surface around the projection lens, Since the light from the light source is reflected toward the rear surface of the projection lens, the following operational effects can be obtained.

  That is, the light from the light source reflected by the additional reflector is incident on the projection lens from the front surface, reaches the rear surface thereof, is internally reflected by the rear surface, and then exits forward from the front surface. Therefore, this emitted light can be used as side irradiation light.

  At this time, since the side irradiation light is emitted from the front surface of the projection lens, the side irradiation can be performed without being restricted by the lamp structure.

  As described above, according to the present invention, in the projector-type vehicular lamp, side illumination can be performed without being restricted by the lamp structure. As a result, forward visibility during turning of the vehicle can be enhanced.

  Moreover, this can be realized without causing any trouble in the formation of a light distribution pattern as a projector-type vehicular lamp.

  In the above configuration, in the case of a lamp configuration in which an extension panel formed so as to surround the projection lens is arranged around the projection lens, an additional reflector is configured as a part of the extension panel. Then, it is possible to obtain side irradiation light without increasing the number of parts.

  In the above configuration, if the rear surface of the projection lens is a flat surface, reflection control on the rear surface can be performed with high accuracy. In addition, by adopting such a configuration, the light reflected by the additional reflector and incident on the projection lens can be easily totally reflected on the rear surface, thereby increasing the lamp efficiency.

  In the above configuration, an additional light source that irradiates light toward the rear surface of the projection lens instead of the additional reflector may be arranged at a position ahead of the rear surface around the projection lens.

  Even when such a configuration is adopted, the light emitted from the additional light source is incident on the projection lens from the front surface and reaches the rear surface thereof, and part or all of the light is internally reflected on the rear surface. The light is emitted forward from the front surface. Therefore, this emitted light can be used as side irradiation light.

Plan sectional drawing which shows the vehicle lamp which concerns on one Embodiment of this invention II direction view of FIG. The perspective view which shows the main components of the said vehicle lamp The figure which shows perspectively the light distribution pattern for low beams formed on the virtual vertical screen arrange | positioned in the position of the lamp front 25m by the light irradiated ahead from the said vehicle lamp The same figure as FIG. 2 which shows the 1st modification of the said embodiment. The same figure as FIG. 2 which shows the 2nd modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan sectional view showing a vehicular lamp 10 according to an embodiment of the present invention, and FIG. 2 is a view taken in the direction of the arrow II. FIG. 3 is a perspective view showing the main components of the vehicular lamp 10.

  As shown in these drawings, a vehicular lamp 10 according to the present embodiment is a vehicular headlamp disposed at a right front end portion of a vehicle, and is a transparent body attached to a lamp body 12 and a front end opening thereof. The lamp unit 20 is incorporated in the lamp chamber 16 formed by the light-transmitting cover 14 so that the optical axis can be adjusted.

  The lamp unit 20 is a projector-type lamp unit, and includes a light source bulb 22, a reflector 24, a projection lens 26, a shade 28, and a holder 30.

  The projection lens 26 is a plano-convex aspheric lens in which the front surface 26a is formed as a convex surface and the rear surface 26b is formed as a flat surface, and the optical axis Ax extends in the vehicle front-rear direction. The projection lens 26 converts the light source image formed on the rear focal plane (that is, the focal plane including the rear focal point F of the projection lens 26) as an inverted image on the virtual vertical screen arranged in front of the lamp. Projected.

  The light source bulb 22 is a discharge bulb having a discharge light emitting portion extending substantially coaxially with the optical axis Ax as a light source 22a, and is inserted into a rear top opening of the reflector 24.

  The reflector 24 has a reflecting surface 24 a that reflects light from the light source 22 a toward the projection lens 26. The cross-sectional shape along the plane including the optical axis Ax of the reflecting surface 24a is set to be substantially elliptical, and the eccentricity is set to gradually increase from the vertical cross section toward the horizontal cross section. As a result, the light from the light source 22a reflected by the reflecting surface 24a is substantially converged to the vicinity of the rear focal point F in the vertical section, and the convergence position is set to the front side of the rear focal point F in the horizontal section. It is supposed to be displaced.

  The holder 30 is a member disposed between the projection lens 26 and the reflector 24, and has a configuration in which a front end portion and a rear end portion thereof are connected by a plurality of legs. The holder 30 supports the projection lens 26 at the front end thereof, and is supported by the reflector 24 at the rear end thereof.

  The shade 28 is formed integrally with the holder 30 so as to extend rearward from the front end portion in the substantially lower half of the holder 30. The shade 28 is formed on the left and right steps so that the upper edge 28 a passes through the rear focal point F of the projection lens 26. The shade 28 blocks part of the reflected light from the reflector 24 and removes most of the upward light emitted forward from the projection lens 26.

  As shown in FIG. 1, an extension panel 18 formed so as to surround the projection lens 26 is disposed around the projection lens 26 in the lamp chamber 16. The extension panel 18 is supported by the lamp body 12.

  In addition, an additional reflector 40 that reflects light from the light source 22a toward the rear surface 26b of the projection lens 26 is disposed on the diagonally upper left front of the projection lens 26 in the lamp chamber 16 (obliquely upper right front in the lamp front view). Yes.

  Specifically, the additional reflector 40 has a reflecting surface 40a that reflects direct light from the light source 22a through the space between the reflector 24 and the projection lens 26 toward the slightly upward direction inside the vehicle width direction. Yes. At this time, the reflection surface 40 a has a curved shape that reflects the light from the light source 22 a as parallel light and makes the reflected light enter the left region of the front surface 26 a of the projection lens 26.

  Since the front surface 26a of the projection lens 26 is a convex surface, the reflected light from the additional reflector 40 that has reached the front surface 26a enters the projection lens 26 as convergent light and reaches the rear surface 26b. At this time, the rear surface 26b is formed by a plane orthogonal to the optical axis Ax, and the incident angle exceeds the critical angle. Therefore, the light reaching the rear surface 26b is internally reflected by total reflection. Become.

  Thus, the light internally reflected by the rear surface 26b of the projection lens 26 reaches the right region of the front surface 26a of the projection lens 26, and is emitted as light that travels slightly downward in the vehicle width direction from the front surface 26a. Become. At this time, since the front surface 26a is a convex surface, the emitted light becomes convergent light with a higher degree of convergence, and finally becomes diffused light.

  As shown in FIG. 1, the additional reflector 40 is configured as a part of the extension panel 18. That is, the additional reflector 40 is formed at the same time as the extension panel 18 is formed, and the reflection surface treatment such as aluminum deposition is performed on the reflection surface 40a.

  FIG. 4 is a perspective view of a low beam light distribution pattern PL formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicular lamp 10 according to the present embodiment. FIG.

  As shown in the figure, this low beam light distribution pattern PL is a left light distribution light beam distribution pattern, and has upper and lower cut-off lines CL1 and CL2 at its upper edge. The cut-off lines CL1 and CL2 extend in the horizontal direction at the left and right steps with the VV line passing through the HV, which is a vanishing point in the front direction of the lamp, in the vertical direction. The opposite lane side portion is formed as the opposite lane side cut-off line CL1, and the own lane side portion on the left side of the VV line is stepped up from the opposite lane side cut-off line CL1 through an inclined portion. It is formed as a lane side cut-off line CL2.

  The low beam light distribution pattern PL is configured as a combined light distribution pattern of the basic light distribution pattern P0 and the additional light distribution pattern PA.

  The basic light distribution pattern P0 is a light distribution pattern that forms the basic shape of the low-beam light distribution pattern PL, and is formed by light from the light source 22a that is reflected by the reflector 24 and transmitted through the projection lens 26. Yes. That is, the basic light distribution pattern P0 is obtained by imaging the image of the light source 22a formed on the rear focal plane of the projection lens 26 by the light from the light source 22a reflected by the reflection surface 24a of the reflector 24 by the projection lens 26. It is formed by projecting as a reverse projection image on a vertical screen, and the cut-off lines CL1 and CL2 are formed as reverse projection images of the upper edge 28a of the shade 28.

  On the other hand, the additional light distribution pattern PA is additionally formed to reinforce the brightness of the right diffusion region of the basic light distribution pattern P0 and to expand the low beam light distribution pattern PL to the right side of the basic light distribution pattern P0. It is a light distribution pattern.

  The additional light distribution pattern PA is a light distribution pattern formed by reflecting light from the light source 22a toward the rear surface 26b of the projection lens 26 by the additional reflector 40. At this time, since the emitted light from the projection lens 26 becomes diffused light directed slightly downward in the vehicle width direction outer side, this additional light distribution pattern PA is a relatively large light distribution pattern of the basic light distribution pattern P0. It will be formed below the oncoming lane side cut-off line CL1 so as to partially overlap the right end.

  Next, the effect of this embodiment is demonstrated.

  The vehicular lamp 10 according to the present embodiment includes a projector-type lamp unit 20, but the additional reflector 40 disposed at the front side of the rear surface 26 b around the projection lens 26 causes the light source 22 a to be used. Is reflected toward the rear surface 26b of the projection lens 26, the following effects can be obtained.

  That is, the light from the light source 22a reflected by the additional reflector 40 enters the projection lens 26 from the front surface 26a, reaches the rear surface 26b, is reflected internally by the rear surface 26b, and then forwards from the front surface 26a. Will be emitted. Therefore, this emitted light can be used as side irradiation light.

  At this time, since the side irradiation light becomes light emitted from the front surface 26a of the projection lens 26, the side irradiation can be performed without being restricted by the lamp structure. Specifically, although the extension panel 18 is disposed around the projection lens 26, the side illumination can be performed without being shielded by the extension panel 18.

  As described above, according to the present embodiment, in the vehicular lamp 10 including the projector-type lamp unit 20, the side illumination can be performed without being restricted by the lamp structure. As a result, forward visibility during turning of the vehicle can be enhanced.

  Moreover, this can be realized without causing any trouble in the formation of the basic light distribution pattern P0 as the projector-type lamp unit 20.

  At this time, in the present embodiment, since the rear surface 26b of the projection lens 26 is a flat surface, reflection control on the rear surface 26b can be performed with high accuracy. In addition, by adopting such a configuration, the light reflected by the additional reflector 40 and incident on the projection lens 26 can be easily totally reflected by the rear surface 26b, thereby improving the lamp efficiency. .

  In the present embodiment, since the additional reflector 40 is configured as a part of the extension panel 18 disposed around the projection lens 26, the side irradiation light can be obtained without increasing the number of parts.

  In the above embodiment, the vehicular lamp 10 has been described as being disposed at the right front end of the vehicle. However, even when the vehicular lamp 10 is disposed at the left front end of the vehicle, the additional reflector 40 is disposed with respect to the optical axis Ax. By adopting a configuration that is arranged in a symmetrical positional relationship, it is possible to obtain the same operational effects as in the above embodiment.

  In the above embodiment, the vehicular lamp 10 is described as being configured to form the left light distribution light beam distribution pattern as the low beam light distribution pattern PL. Even in the case where the light distribution pattern is formed, the same function and effect can be obtained by adopting the same structure as the above embodiment, and further, the light distribution pattern for fog lamps and the like are formed. Even in such a configuration, it is possible to obtain the same effects as those of the above embodiment.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG. 5 is a view similar to FIG. 2 showing the vehicular lamp 110 according to this modification.

  As shown in the figure, in this modification, the configuration of the lamp unit 120 is the same as that in the above embodiment, but the configuration of the additional reflector 140 is different from that in the above embodiment.

  That is, the additional reflector 140 of this modification is the same as the case of the additional reflector 40 of the above embodiment with respect to the arrangement and the shape of the reflecting surface 140a, but is configured as an independent member rather than as a part of the extension panel 18. This is different from the above embodiment. At this time, the additional reflector 140 is supported by the holder 30 of the lamp unit 120.

  Even in the case of adopting the configuration of this modification, it is possible to obtain the same effects as those of the above embodiment.

  In addition, in this modification, since the additional reflector 140 is supported by the holder 30, even when the optical axis of the lamp unit 120 is adjusted, the additional reflector 140, the light source 22a, and the projection lens 26 are used. The positional relationship with can always be kept constant. Therefore, the additional light distribution pattern PA can be formed in a predetermined positional relationship and the same shape with respect to the basic light distribution pattern P0 regardless of whether or not the optical axis of the lamp unit 120 is adjusted.

  Next, a second modification of the above embodiment will be described.

  FIG. 6 is a view similar to FIG. 2 showing a vehicular lamp 210 according to this modification.

  As shown in the figure, in this modification, the configuration of the lamp unit 220 is the same as that in the above embodiment, but an additional light source 250 is arranged instead of the additional reflector 40.

  That is, in the present modification, the additional reflector 40 of the above-described embodiment is not disposed, and instead, the additional light source 250 is positioned in front of the rear surface 26b around the projection lens 26. Has been placed. The additional light source 250 irradiates light toward the rear surface 26 b of the projection lens 26.

  Specifically, the additional light source 250 is disposed so as to irradiate light toward the left region of the front surface 26 a of the projection lens 26 at an upper left front of the projection lens 26. At this time, the additional light source 250 is composed of a light emitting surface of a light emitting diode (or a filament of a small light bulb), and directivity is given to the light irradiation direction so that the emitted light becomes light close to parallel light. ing. The additional light source 250 is supported by the holder 30 of the lamp unit 220 via the mounting bracket 252.

  Also in this modification, the light emitted from the additional light source 250 is incident on the projection lens 26 from the front surface 26a, reaches the rear surface 26b, is internally reflected by total reflection on the rear surface 26b, and then is reflected from the front surface 26a. The light is emitted toward the front. Therefore, this emitted light can be used as side irradiation light.

  Also in this modified example, since the additional light source 250 is supported by the holder 30, even if the optical axis of the lamp unit 220 is adjusted, the positional relationship between the additional light source 250, the light source 22a, and the projection lens 26 is always constant. Can be maintained.

  In addition, the numerical value shown as a specification in the said embodiment and each modification is only an example, and of course, you may set these to a different value suitably.

DESCRIPTION OF SYMBOLS 10, 110, 210 Vehicle lamp 12 Lamp body 14 Translucent cover 16 Light chamber 18 Extension panel 20, 120, 220 Lamp unit 22 Light source bulb 22a Light source 24 Reflector 24a Reflective surface 26 Projection lens 26a Front surface 26b Rear surface 28 Shade 28a Upper edge 30 Holder 40, 140 Additional reflector 40a, 140a Reflective surface 250 Additional light source 252 Mounting bracket Ax Optical axis CL1 Opposite lane side cut-off line CL2 Own lane side cut-off line F Rear focus P0 Basic light distribution pattern PA Additional light distribution pattern PL For low beam Light distribution pattern

Claims (4)

In a vehicle lamp comprising: a projection lens; a light source disposed behind the projection lens; and a reflector that reflects light from the light source toward the projection lens.
An additional reflector for reflecting light from the light source toward the rear surface of the projection lens is disposed at a position ahead of the rear surface of the projection lens around the projection lens. Light fixture. An extension panel formed to surround the projection lens is disposed around the projection lens,
The vehicular lamp according to claim 1, wherein the additional reflector is configured as a part of the extension panel.   The vehicular lamp according to claim 1, wherein a rear surface of the projection lens is a flat surface. In a vehicle lamp comprising: a projection lens; a light source disposed behind the projection lens; and a reflector that reflects light from the light source toward the projection lens.
A vehicular lamp characterized in that an additional light source for irradiating light toward the rear surface of the projection lens is disposed at a position ahead of the rear surface of the projection lens around the projection lens.

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