JP5444051B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that suppresses the generation of glare light.

  A light source, a reflector arranged so as to surround the light source and reflecting light emitted from the light source toward the front of the light irradiation direction (of the lamp), and stands up from the lower part of the reflector and extends forward in the light irradiation direction In a vehicular lamp equipped with a standing wall, the light emitted from the light source is reflected by the standing wall, and the reflected light becomes glare light that does not contribute to the formation of the light distribution pattern, and dazzles the driver of the oncoming vehicle or the preceding vehicle In order to prevent this, there has been proposed a vehicular lamp in which a standing wall is provided with means for preventing glare light generation.

  As a specific example, a part of the standing wall is formed to be inclined downward toward the side with respect to the optical axis of the light source, and the emitted light emitted from the light source toward the standing wall is forward in the light irradiation direction. On the other hand, by reflecting toward the outer side in the left-right direction, the reflected light from the standing wall is prevented from becoming glare light (see, for example, Patent Document 1).

  Further, as another example, the position of the reflector is shifted to the front side to move the rising position of the standing wall to the front side, and the emitted light emitted from the light source toward the standing wall is moved to the front side by the movement of the standing wall to the standing position. The light emitted from the light source that has become glare light due to the reflection of the standing wall is reflected by the reflector to avoid the glare light and to contribute effectively to the formation of the light distribution pattern. (For example, refer to Patent Document 2).

JP 2009-123689 A JP 2009-104815 A

  By the way, including the proposed vehicle lamp, a light source, a reflector that is arranged so as to surround the light source and reflects light emitted from the light source forward in the light irradiation direction, and light rising from the lower part of the reflector. In a vehicular lamp provided with a standing wall extending forward in the irradiation direction, it is an unavoidable problem that light reflected from the standing wall among the emitted light from the light source becomes a cause of glare light.

  In particular, in fog lamps, requirements in accordance with European legislation ECE, North American standard SAE, etc. have become strict in recent years, and fog lamps having a conventional configuration cannot satisfy the standards.

  Various factors can be considered for the reflected light from the standing wall to become glare light, but there are mainly two factors. As shown in FIG. 15, the light emitted from the light source 50 is reflected by the reflector 51, the reflected light is further reflected by the standing wall 52, and the reflected light is irradiated outside the lamp to become glare light. is there.

  In this case, the reflector 51 includes a rotating paraboloidal reflecting surface 51a having a focal point in the vicinity of the light source (filament), and outgoing light emitted from the light source 50 toward the reflecting surface 51a of the reflector 51 is reflected on the reflecting surface 51a. Most of the reflected light is irradiated outside the lamp substantially parallel (not completely parallel light rays by light distribution control) along the optical axis X of the light source 50.

  However, at the reflecting surface 51a located near the portion where the standing wall 52 rises, part or all of the light emitted from the light source 50 is reflected toward the standing wall 52, and the reflected light from the reflecting surface 52a of the standing wall 52 is outside the lamp. Is irradiated with glare light.

  Further, as shown in FIG. 16, the light emitted from the light source 50 toward the reflecting surface 52a near the rising portion of the standing wall 52 is formed in a knurled shape because the reflecting surface 52a is formed in a knurled shape. A part of the light is reflected in the direction of the reflecting surface 51a of the reflector 51, and the light reflected by the reflecting surface 51a is irradiated outside the lamp to become glare light.

  Accordingly, the present invention has been made in view of the above problems, and the object of the present invention is to provide a light source and a reflector that is disposed so as to surround the light source and reflects light emitted from the light source forward in the light irradiation direction. In addition, in a vehicular lamp having a standing wall that rises from the lower part of the reflector and extends forward in the light irradiation direction of the lamp, the reflected light from the standing wall among the emitted light from the light source becomes a cause of the generation of glare light. It is in providing the structure which suppresses this.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention includes a light source, a reflector disposed so as to cover the light source and having a surface facing the light source as a reflection surface, and the reflection surface including the reflection surface. A step portion having a reflection surface that is a locus of the cutting line formed by cutting an arbitrary position below the optical axis of the light source by a horizontal plane and moving the cutting line as it is, and a lower portion of the step portion are substantially It is characterized by comprising a standing wall portion having a reflecting surface that is a locus of the cutting line that is formed when the cutting line is cut forward on a horizontal plane or a substantially curved surface and the cutting line is moved forward as it is.

  Further, according to a second aspect of the present invention, in the first aspect, the reflecting surface of the stepped portion is rearward from a position where the inclination with respect to the straight line perpendicular to the optical axis is inclined by about 5 ° toward the front side. It is in the range which inclines to the side.

  Further, in the invention described in claim 3 of the present invention, in claim 1 or claim 2, the reflecting surface of the standing wall portion is formed such that concave portions and convex portions extending forward are alternately and continuously formed. A knurled surface.

  The vehicular lamp of the present invention is provided with a stepped portion connecting the reflector and the standing wall portion so that the emitted light emitted downward from the light source is reflected by the step reflecting surface of the stepped portion.

  As a result, the reflected light reflected by the step reflection surface is irradiated toward the front upper direction of the lamp, and the generation of glare light is suppressed.

It is a perspective view of an embodiment. It is a longitudinal cross-sectional view of embodiment. It is the elements on larger scale of embodiment. It is a light ray figure of embodiment and a prior art example. FIG. 5 is a light intensity distribution of a light beam simulation result according to the embodiment of FIG. It is a luminous intensity distribution of the light ray simulation result concerning the prior art example of FIG. It is a light ray diagram of an embodiment. It is a luminous intensity distribution of the light ray simulation result concerning FIG. It is a luminous intensity distribution of the light ray simulation result concerning FIG. It is a light ray diagram of an embodiment. It is a luminous intensity distribution of the light ray simulation result concerning FIG. It is a light ray figure of a prior art example. It is explanatory drawing of the inclination-angle of a level | step-difference part. It is a graph of the light ray simulation result concerning FIG. It is explanatory drawing of a prior art example. Similarly, it is explanatory drawing of a prior art example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 14 (the same reference numerals are given to the same portions). 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. Unless stated to the effect, the present invention is not limited to these embodiments.

  FIG. 1 is a perspective view of a vehicular lamp according to the present invention as seen from the direction of light irradiation, and FIG. 2 is a longitudinal sectional view of FIG. In addition, terms used in the following description to indicate directions such as “left-right direction”, “Y-axis direction or up-down direction”, “front-rear direction” are “vehicle width direction” when the vehicle lamp is mounted on the vehicle. ”,“ Vehicle height direction ”, and“ vehicle length direction ”.

  The vehicular lamp 1 according to the present invention has a basic configuration in which a multi-reflector (hereinafter referred to as a composite reflecting surface 3a in which a surface facing the light source 2 and a surface facing the light source 2 is configured by a plurality of reflecting surfaces is provided. , Abbreviated as a reflector) 3, a stepped portion 4 connected to the lower end of the reflector 3 and extending downward, and connected to the lower end of the stepped portion 4 toward the front of the light irradiation direction of the lamp (front of the lamp). And a front cover lens (not shown) positioned in front of an opening formed by the reflector 3 and the standing wall 5, and each reflecting surface constituting the composite reflecting surface 3 a of the reflector 3 from the light source 2. The outgoing light emitted toward is reflected in the appropriate direction by the respective reflecting surfaces, and a desired light distribution pattern is formed by the irradiation light by the reflected light.

  Details of the basic configuration described above will be specifically described below. First, the light source 2 is a light bulb that is generally used as a light source for a vehicle lamp such as a halogen light bulb, and is arranged with its optical axis A facing the light irradiation direction of the lamp.

  And the reflector 3 which makes the surface which opposes the light source 2 by the some reflective surface 3a comprised so that it may cover the light source 2 from the side and diagonally forward is arrange | positioned.

  In this embodiment, the composite reflective surface 3a is an elliptical paraboloidal reflective surface in which the shape of the cross section perpendicular to the optical axis X of the light source 2 is a substantially elliptical shape with the long axis direction being the horizontal direction. Yes. However, it is also possible to use a parabolic reflecting surface whose cross section is a horizontally long shape such as a substantially rectangular shape, a substantially parallelogram shape, or a substantially trapezoidal shape.

  The composite reflecting surface 3a has a shape obtained by cutting an arbitrary position below the optical axis X with a substantially horizontal plane, and a cutting line formed when the cutting line is moved downward is directly below the cutting line. A step portion 4 having a locus as a reflection surface (step reflection surface 4a) is formed.

  The step reflection surface 4a of the step portion 4 has a shape obtained by cutting an arbitrary lower position at a substantially horizontal or curved surface having continuous irregularities, and the cutting line is moved forward in front of the cutting line. The standing wall portion 5 is formed with the trajectory of the cutting line that is sometimes formed as a reflecting surface (standing wall reflecting surface 5a).

  As shown in FIG. 3, the standing wall reflecting surface 5 a of the standing wall portion 5 has a substantially planar shape or a substantially curved surface shape having a knurling formed by alternately and continuously forming concave portions 5 b and convex portions 5 c extending in the forward direction. ing.

  Therefore, the optical action and effect of the step reflecting surface of the step portion will be described with reference to FIG. In the drawing, a state where no stepped portion is provided is also shown, and the description will be made by comparing the optical path formation when the stepped portion is provided and when the stepped portion is not provided.

First, when the step portion is not provided, the outgoing light L1 emitted from the light source 2 toward the composite reflective surface 3a of the lower reflector 3 is reflected by the composite reflective surface 3a indicated by the dotted line, and the reflected light is incident on the incident angle. enters the vertical wall reflecting surface 5a of upright wall 5 by alpha _1, the reflected light L2 is irradiated toward the front of the lamp is reflected at a reflection angle alpha ₁ of the same angle.

On the other hand, when the step portion 4 is provided, the outgoing light L1 emitted from the light source 2 and passing through the same optical path to the step reflection surface 4a of the step portion 4 is reflected by the step reflection surface 4a and the reflected light is reflected. enters the vertical wall reflecting surface 5a of upright wall 5 at an incident angle alpha _2, the reflected light L3 is illuminated toward the front on the lamp is reflected at a reflection angle alpha ₂ of the same angle.

Comparing the reflection angle alpha ₁ and the reflection angle alpha ₂ in the standing wall reflecting surface 5a, towards the alpha ₂ than alpha ₁ is a small angle. That is, when the step portion 4 is provided, the reflected light L3 reflected by the standing wall reflecting surface 5a is diffused upward as compared with the case where the step portion is not provided. As a result, when the stepped portion 4 is provided, the reflected light L3 from the standing wall reflecting surface 5a is further away from the horizontal reference line H of the light distribution pattern, and the glare light is less likely to occur.

  In addition, the standing wall reflecting surface 5a having the knurls in which the concave portions and the convex portions extending in the forward direction of the standing wall portion 5 are alternately and continuously formed is substantially the same as the knurls having the stepped portions and the uneven portions. The shape of the trajectory of the cutting line formed when the cutting line cut along the horizontal plane or the substantially curved surface is moved forward as it is. Therefore, although the front part of the standing wall reflecting surface 5a has little light diffusion effect due to the knurled shape, the reflected light from the stepped part 4 is incident at an angle close to the standing wall reflecting surface 5a at the part near the stepped part 4 of the standing wall reflecting part 5a. Therefore, the diffusion effect of the continuous uneven shape of the knurls is strongly received. As a result, the reflected light L3 from the standing wall reflecting surface 5a can be diffused upward and the glare light can be suppressed.

  FIG. 5 and FIG. 6 show the result of verifying the effect of suppressing the generation of glare light by providing the stepped portion by the light ray simulation. FIG. 5 relates to a vehicular lamp having a stepped portion. As shown in FIG. 4, the emitted light L1 emitted from the light source 2 toward the stepped reflecting surface 4a of the stepped portion 4 is sequentially stepped reflecting surface 4a. And the projection figure which is reflected on the standing wall reflective surface 5a of the standing wall part 5, and the reflected light L3 projects on the front screen is shown.

  On the other hand, FIG. 6 relates to a vehicular lamp that does not have a stepped portion, and is emitted from the light source 2 and emitted toward the composite reflecting surface 3a of the reflector 3 through the same optical path as shown in FIG. The projected light L1 reflected by the composite reflecting surface 3a indicated by the dotted line and the standing wall reflecting surface 5a of the standing wall portion 5 is projected onto the front screen.

  Comparing FIG. 5 and FIG. 6, FIG. 6 shows that the luminous intensity distribution on the screen is formed in a concentrated manner near the intersection of the horizontal reference line H and the vertical reference line V, resulting in glare light. ing. On the other hand, FIG. 5 shows that the luminous intensity distribution on the screen is dispersed at a position away from the vicinity of the intersection of the horizontal reference line H and the vertical reference line V, and the generation of glare light is small. It was verified from this light ray simulation that the generation of glare light can be suppressed by providing the stepped portion 4 below the reflector 3.

  When a step is provided at the lower part of the reflector, the emitted light emitted from the light source 2 toward the standing wall reflecting surface 5a near the step 4 of the standing wall 5 is reflected by the standing wall reflecting surface 5a as shown in FIG. Then, the reflected light is directed to the step reflecting surface 4a, and the reflected light reflected by the step reflecting surface 4a is applied to the front upper part of the lamp. FIG. 8 is a projection diagram obtained by projecting the irradiation light onto the screen by light ray simulation. In this case, the luminous intensity distribution on the screen is also above the intersection between the horizontal reference line H and the vertical reference line V. It indicates that the generation of glare light can be suppressed.

  The luminous intensity distribution projected on the screen of FIG. 9 shows that the emitted light emitted from the light source 2 toward the step reflecting surface 4a of the step portion 4 is step-reflected in the lamp having the step portion 4 as shown in FIG. Reflected light L4 reflected by the surface 4a and reflected by the standing wall reflecting surface 5a toward the standing wall reflecting surface 5a of the standing wall 5 and outgoing light emitted from the light source 2 toward the standing wall reflecting surface 5a of the standing wall 5 The luminous intensity distribution formed by the reflected light synthesized by the reflected light L5 reflected by the reflecting surface 5a, directed to the step reflecting surface 4a of the stepped portion 4 and reflected by the step reflecting surface 4a is obtained by ray simulation. is there.

  Further, the luminous intensity distribution projected on the screen in FIG. 11 is obtained by combining the emitted light emitted from the light source 2 toward the composite reflecting surface 3a of the reflector 3 in a lamp having no stepped portion as shown in FIG. Reflected light L6 reflected by the reflecting surface 3a and reflected by the standing wall reflecting surface 5a toward the standing wall reflecting surface 5a of the standing wall 5 and outgoing light emitted from the light source 2 toward the standing wall reflecting surface 5a of the standing wall 5 The luminous intensity distribution formed by the combined reflected light of the reflected light L7 reflected by the standing wall reflecting surface 5a and directed to the composite reflecting surface 3a of the reflector 3 and reflected by the composite reflecting surface 3a is obtained by light ray simulation. .

  Comparison of the luminous intensity distributions of FIGS. 9 and 11 shows that the luminous intensity distribution of FIG. 9 is located near the intersection of the horizontal reference line H and the vertical reference line V, and the generation of glare light can be suppressed. On the other hand, the light intensity distribution in FIG. 11 is also located on the horizontal reference line H, and it can be seen that a lot of glare light is generated. This light ray simulation also shows that the stepped portion 4 suppresses the generation of glare light.

  Note that the stepped portion 4 is preferably inclined at an angle θ with respect to the vertical direction (Y-axis) in the range from 5 ° forward to the rear side, and this inclination angle is also verified by light ray simulation.

  Specifically, as shown in FIG. 13, an angle θ with respect to the vertical direction (Y-axis) of the step reflection surface 4a of the step portion 4 (+ when tilted forward and − when tilted backward) is defined. , + 19 ° (the angle of the composite reflecting surface at a position corresponding to the step reflecting surface without having a step portion), + 10 °, + 5 °, + 2 °, 0 °, −2 °, −5 °, −10 °, The maximum luminous intensity and luminous flux in the vicinity of the intersection of the horizontal reference line H and the vertical reference line V of the irradiated light by each were verified.

  The simulation result is shown in FIG. As can be seen from this graph, the inclination angle with respect to the vertical direction (Y-axis) of the step reflecting surface 4a ranges from 19 ° forward to about 5 ° forward, and the maximum luminous intensity near the intersection of the horizontal reference line H and the vertical reference line V. It can be seen that the value of the luminous flux is high and strong glare light is irradiated. On the other hand, when the inclination angle is about 5 ° in the front, the maximum luminous intensity and the luminous flux values are drastically decreased, and the same maximum luminous intensity and luminous flux are shown for the inclination from the inclination of about 5 ° to the rear. However, this inclination angle is determined by conditions such as the size of the opening of the lamp, the F value of the composite reflecting surface, and the uneven shape of the composite reflecting surface. If the conditions change, the preferred θ value also changes.

  From this, it was verified that the glare light can be surely suppressed by inclining the angle θ of the stepped portion 4 with respect to the vertical direction (Y axis) of the stepped reflection surface 4a from about 5 ° to the rear side.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 3 ... Multi reflector 3a ... Composite reflective surface 4 ... Step part 4a ... Step reflective surface 5 ... Standing wall part 5a ... Standing wall reflecting surface 5b ... Concave part 5c ... Convex part

Claims (3)

A light source;
A reflector that is disposed so as to cover the light source and has a reflective surface as a surface facing the light source;
A step portion having a reflection surface as a locus of the cutting line formed by cutting the reflection surface at an arbitrary position below the optical axis of the light source with a horizontal plane and moving the cutting line as it is,
A vehicle comprising: a standing wall portion having a reflection surface that is a locus of the cutting line formed by cutting a lower portion of the stepped portion with a substantially horizontal plane or a substantially curved surface and moving the cutting line as it is. Lamps.   2. The vehicle according to claim 1, wherein the reflecting surface of the stepped portion has an inclination with respect to a straight line perpendicular to the optical axis in a range inclined from a position inclined about 5 ° to the front side to the rear side. Light fixture.   The vehicular lamp according to claim 1, wherein the reflecting surface of the standing wall portion is a knurled surface formed by alternately and continuously forming concave portions and convex portions extending forward.