JP4390271B2 - Lighting fixtures for vehicles - Google Patents

Description

    The present invention relates to a vehicular lamp that is used for lighting such as a headlight and a fog light, is called a projector type, and employs an elliptical reflector, and more specifically, approximately 1/4. The present invention relates to the development of a configuration capable of improving the luminous flux utilization factor of this type of vehicle lamp.

  FIG. 10 shows an example of the configuration of a conventional projector-type lamp (10). The projector-type lamp (10) is a reflector (14a) having a spheroidal surface or the like having a light source (12) as a first focal point F1. And the light from the light source (12) is focused on the second focal point F2.

  In the vicinity of the second focal point F2, for example, a light-shielding plate (22) covering the lower half is provided, so that the light converged on the second focal point F2 is substantially a semicircular shape of the lower chord. Since the projection lens (18) having a focal point on the light shielding plate (22) is provided in front of the light shielding plate (22), it converges to the second focal point F2 which is a semicircular shape of the lower chord. The light that has been turned upside down and left and right is projected in front of the vehicle as a semicircular shape of the upper string.

Therefore, the irradiation light from the projector-type lamp (10) does not include any upward light, and an ideal light distribution characteristic that does not give a dazzle to the driver of the oncoming vehicle can be obtained. It becomes. However, in reality, if no light is emitted above the horizontal level, road signs cannot be confirmed. Therefore, when the traffic law is left-hand traffic, it is directed toward the left, also called an elbow. ° It emits light that rises to the left (see Fig. 4) so that pedestrians can be confirmed and road signs can be read.
JP 2001-76510 A

  However, as described above, in the vehicular lamp, in order to irradiate far away, the light from the light source must be converged in the form of a beam. For this reason, a reflector such as a paraboloidal system or an elliptical system is used. It is configured to use and converge the light in the form of a beam, which causes problems such as illusion to the driver of the oncoming vehicle, so that no upward light beam is generated on the oncoming lane side. For example, the shape of the light distribution characteristic is regulated.

  Because of this regulation, in the vehicle lighting fixtures that employ any reflector, parabolic system, ellipsoidal system, the light from the lower half of the filament and the discharge arc will later cause upward light generation. The light shielding plate or the like is almost completely shielded, and at this point, the luminous flux utilization rate with respect to the light source is reduced to 50%. Furthermore, it is impossible to surround the entire circumference of the light source with the reflector, and naturally the light beam capture rate is also reduced, and the light beam utilization rate is substantially reduced to about 1/4 as described above, A further improvement in luminous flux utilization is desired.

  As a specific means for solving the above-mentioned conventional problems, the present invention is formed as one light source and a substantially upper half portion with respect to the long axis set to be substantially horizontal with the light source as the first focal point. A first elliptical reflecting surface, a first light shielding plate installed in the vicinity of the second focal point of the first elliptical reflecting surface, and a center arranged on the major axis and in the vicinity of the light shielding plate A projection lamp having a projection lens, and a reflecting surface side so that the light source is a first focal point and a second focal point is downward or obliquely downward with respect to the irradiation direction of the projector lamp. A second elliptical reflecting surface and a third elliptical reflecting surface provided substantially opposite to each other, and the second focal points of the second elliptical reflecting surface and the third circular reflecting surface are attached as focal points. The reflected light is substantially the same as the irradiation direction of the projector lamp. By providing a vehicular illumination lamp characterized by comprising a first parabolic reflecting surface that reflects in the direction and a second parabolic reflecting surface, it is possible to improve the luminous flux utilization rate for the light source It solves the problem.

  According to the present invention, the first light shielding plate is used to reflect light in a direction other than the first light shielding plate on the lower half of the first elliptical reflecting surface, which hardly uses light. First and second parabolic reflections that provide a second elliptical reflecting surface and a third elliptical reflecting surface and re-reflect the light collected by the second and third elliptical reflecting surfaces in the irradiation direction. The provision of the surface improves the light beam capturing rate with respect to the light source, and solves the problem of realizing a brighter illumination lamp for a vehicle even with the same light source.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. FIG. 1 shows a first embodiment of a vehicular illumination lamp 1 according to the present invention. First, the configuration of a projector lamp 6 having a configuration almost the same as that normally used will be described. .

  The projector lamp 6 includes a light source 2 such as a halogen lamp or a metal halide discharge lamp, a first elliptical reflecting surface 3 such as a spheroid having the light source 2 as a first focal point, and the first elliptical reflecting surface. 3 is composed of a first light shielding plate 4 disposed in the vicinity of the second focal point F2 and a projection lens 5 having a focal point in the vicinity of the first light shielding plate. In addition, a portion for attaching the first light shielding plate 4 and the projection lens 5 is required in front of the first elliptical reflecting surface 3, but these are configured in the conventional manner (not shown). )ing.

  Here, in the projector lamp 6, the first elliptical reflecting surface 3 is formed as a spheroidal surface, for example, in the conventional example and has a shape surrounding the light source 2 around the entire circumference. In a state where the lower half is cut off and the light source 2 is turned on, direct light from the light source 2 is emitted downward.

  Note that the light distribution characteristic of the actual passing lamp requires a left-up light distribution called an elbow in order to make it easier to read the road signs on the left road side when left-handed. Therefore, the first elliptical reflecting surface 3 is provided from the center in the horizontal direction, that is, from the major axis Z to an appropriate lower position, and a countermeasure for obtaining necessary upward light is performed. Yes.

  A first light shielding plate 4 and a projection lens 5 are attached to the first elliptical reflecting surface 3 at respective predetermined positions to form a projector lamp 6. Therefore, the projector lamp 6 formed by the above process uses a projector lamp that is originally cut off from the first elliptical reflecting surface 3 that is shielded from light by the first shading plate 4. Thus, almost the same light distribution shape and brightness as this type of conventional projector lamp can be obtained.

  As described above, in the present invention, since the substantially lower half of the first elliptical reflecting surface 3 is deleted, in this state, the light from the light source 2 is deleted. The light is emitted from the portion to the outside as a hemisphere having the lower half of the sphere, and the amount of light is approximately half of the total light amount of the light source 2.

  As described above, this is because the projector lamp 6 has already obtained a function as a headlight that does not change the amount of light as much as in the prior art. If it is possible to add the emitted portion of light to the eaves as a headlight obtained by the projector lamp 6, a headlight that is brighter by the added amount can be obtained by the light source 2.

  In the present invention, in order to capture the light emitted from the light source 2, the second elliptical reflective surface 31 and the third elliptical reflective surface 32 having the light source 2 as the first focal point F1 are removed. In the first embodiment, the second elliptical reflective surface 31 and the third elliptical reflective surface 32 are the light source 2, that is, the first elliptical reflective surface. A substantially vertical line passing through one focal point F1 is formed as a major axis Z2.

  Accordingly, the second focal point F21 of the second elliptical reflecting surface 31 and the second focal point F31 of the third elliptical reflecting surface 32 are present on the same major axis Z2. This first embodiment In the second elliptical reflecting surface 31, an elliptical surface having a short distance between the first focal point F1 and the second focal point F21 is adopted and is installed on the irradiation direction side of the projector lamp 6. ing.

  On the other hand, the third elliptical reflecting surface 32 employs an ellipsoid whose distance between the first focal point F1 and the second focal point F31 is longer than that of the second elliptical reflecting surface 31. In correspondence with the second elliptical reflective surface 31, the third elliptical reflective surface 32 is provided in a state of facing the reflective surface, that is, in a state of facing each other.

  In addition, in the present invention, the first parabolic reflection surface 71 is provided with the second focal point F21 of the second elliptical reflection surface 31 as a focal point and the reflection direction as the irradiation direction side of the projector lamp 6. Similarly, corresponding to the second focal point F31 of the third elliptical reflecting surface 32, the second focal point is the second focal point F31, and the reflection direction is the irradiation direction side of the projector lamp 6. A physical reflection surface 72 is provided.

  As is clear from the above description, the position of the second focal point F21 of the second elliptical reflecting surface 31 and the position of the second focal point F31 of the third elliptical reflecting surface 32 are the same as the first release. For example, when the first parabolic reflecting surface 71 is manufactured in a small size, the second reflecting surface 71 and the second parabolic reflecting surface 72 are not interfered with each other. The distance between the focal point F21 and the second focal point F22 may be narrowed.

  Further, in FIG. 1, what is indicated by reference numeral 41 is a second light shielding plate, what is indicated by reference numeral 42 is a third light shielding plate, and the second light shielding plate is the second elliptical reflecting surface. 31 near the second focal point F21, that is, in the vicinity of the first parabolic reflecting surface 71, the direct light from the light source 2 is reflected by the first parabolic reflecting surface 71 to generate upward light. It is provided to prevent the above. The third light shielding plate 42 is also provided for the same purpose.

  Here, the shape of the light source 2 and the installation direction in the present invention will be considered. The longitudinal direction of the light emitting portion of the light source 2 with respect to the main irradiation direction of the vehicle lamp (the HV crossing direction in FIG. 8), for example, the filament 2a in the case of an incandescent bulb, and the arc in the case of a discharge lamp. An arrangement provided so as to be parallel to the vertical direction is defined as a vertical arrangement, and an arrangement provided so as to be orthogonal to the main irradiation direction is defined as a horizontal arrangement. 2 and 3 are schematic views showing the situation of the reflector and the light source in the case of the vertical arrangement, and FIG. 2 shows a vertical section with the lamp mounted on the vehicle, and the left direction in the drawing Is the main irradiation direction. FIG. 3 conceptually shows the state in which the filament is projected when the reflector is viewed from the front.

  4 and 5 are schematic views showing the situation of the reflecting mirror and the light source when the filament 2a is placed horizontally, and FIG. 4 is a vertical view with the lamp mounted on the vehicle in the same manner as described above. A direction cross section is shown, and the left direction in the drawing is the main irradiation direction. FIG. 5 conceptually shows the state in which the filament is projected when the reflector is viewed from the front, as in the case of the vertical arrangement. 2 and 4, the reference numeral 40 indicates a light shielding plate, and the reference numeral 50 indicates a projection lens. In addition, as a light bulb that can be easily placed vertically, a light bulb that is connected in the shape shown as C-8 type in JIS standard C7711 may be adopted. What is necessary is just to employ | adopt the light bulb in which the connection was made in the shape shown as C-6 type in the same standard.

  FIG. 6 schematically shows the state of light projected directly from a reflecting mirror in which the filament is placed vertically, that is, before the light distribution shape is adjusted by the light shielding plate 40 and the projection lens 50. State. As is clear from the front view of FIG. 3, in the case of the vertical arrangement, the filament image is reflected radially to the reflecting mirror, so that the projection projected by the projection lens 50 has a longitudinal direction in each direction. The inclined filament images G1 are overlapped, and as a result, there is a tendency to form a wide beam shape in the vertical direction.

  Therefore, there is a lot of upward light that is cut by the light shielding plate 40, and there is also more light that goes downward, in other words, light that irradiates immediately before the vehicle. As a result, the road surface immediately before becomes brighter than necessary. Because the driver's pupil is narrowed and the visibility is lowered, it becomes difficult to check far away, so it becomes necessary to cut the light amount not only for upward light but also for the short distance side, The loss of light intensity further increases.

  However, as is apparent from FIG. 2, most of the light emitted from the filament is reflected by the reflecting mirror and once converges on the second focal point and then travels toward the lens 50, so that the light flux capturing rate with respect to the light source is excellent. It can be said that

  FIG. 7 schematically shows the state of the light projected from the reflecting mirror in which the filament is placed horizontally. As is apparent from the front view of FIG. Is reflected on the reflecting mirror as a horizontal line or a circular arc (shown as being linear) in the reflecting mirror, so that the shape of the image G2 of the light source is also a substantially horizontal line. It becomes a shape, and it becomes a narrow beam shape up and down. Even in the reflected light from the second ellipsoidal reflecting surface 31 and the third ellipsoidal reflecting surface 32 described later, since the filament is in a horizontally placed state, it becomes a narrow beam shape in the front and rear directions. Since the parabolic reflecting surface 71 and the second parabolic reflecting surface 72 are reflected in the perpendicular direction in a horizontally placed state, the state of FIG. 7 is maintained.

  Accordingly, the amount of upward light to be cut by the light shielding plate 41 may be small, and there is no bright light that irradiates the front of the vehicle. Therefore, it is not necessary to take special measures for that, and the amount of light to be cut is small. It will be a thing. However, as is apparent from FIG. 4, since direct light reaching the lens from the filament without passing through the reflecting mirror is generated, the light flux capturing rate with respect to the light source is slightly inferior to that of the vertically arranged filament. .

  What improves this point is the configuration of the present invention. As described above, the light emitted from the light source and emitted downward without being reflected by the first elliptical reflecting surface 3 is as follows. The light emitted in the circumferential direction from the light source 2 according to the present invention is captured by the second elliptical reflection 31 provided with the reflective surface in the facing direction and the third elliptical reflective surface 32, and The light beams are converged to the respective second focal points F21 and F31, and further, the converged light is directed to the irradiation direction as a beam by the first parabolic reflection surface 71 and the second parabolic reflection surface 72, and the brightness is increased. This is a supplement.

    FIG. 8 shows a state when a passing light distribution is formed by the vehicular illumination lamp 1 according to the present invention. The basic shape D1 of the passing light distribution including a so-called elbow is the first elliptical reflecting surface. 3, the first light shielding plate 4, and the projection lens 5.

  And the shape of the light distribution characteristic formed from the 2nd elliptical reflective surface 31 and the 1st parabolic reflective surface 71, and the 3rd elliptical reflective surface 32 and the 2nd parabolic reflective surface 72 Since it becomes substantially beam-like, a lens or the like that appropriately diffuses in the horizontal direction is provided, and the basic light distribution shape D1 is superposed below the horizontal line H to increase the amount of light. In addition, since the reflected light from the second elliptical reflecting surface 31 reaches the first parabolic reflecting surface 71 in a narrow range, the luminous intensity is high, and as shown by the light distribution D2 in the figure, If the front direction is irradiated in such a state that it does not diffuse so much, even in the case of passing light distribution, it is possible to achieve excellent far vision. In this case, if the light distribution D3 from the third parabolic reflecting surface, which is a larger spot, is wide in horizontal width, the visibility in the left-right direction is improved at the same time.

  FIG. 9 shows a second embodiment of the vehicular illumination lamp 1 according to the present invention. In the first embodiment, the second elliptical reflection on the vertical line (long axis) Z2 passing through the light source 2 is shown. Although the second focal point F21 of the surface 31 and the second focal point F22 of the third elliptical reflecting surface 32 are arranged, the present invention is not limited to this, and the second elliptical reflecting surface as shown in the figure. The major axis Z3 of 31 and the major axis Z4 of the third ellipsoidal reflecting surface 32 may be arranged in a substantially C shape. In short, if the light from the light source 2 can be used effectively, any configuration is possible. It is good.

  Also in the second embodiment, the filament 2a is in a horizontal arrangement, the action of each reflecting surface, the means for forming the light distribution characteristics, and the second and third light shielding plates 41, 42 so that the upward light Since the effect of preventing the occurrence of this is the same as that of the previous embodiment, a detailed description thereof is omitted here.

  As described above, according to the present invention, in the vehicular illumination lamp 1 of the projector type, when the passing light distribution is formed, the light reflected from the first ellipsoidal reflecting surface 3 is substantially half of the upward light. The first light-shielding plate 4 shields the amount of light and causes a considerable amount of light loss. The lower half of the first elliptical reflecting surface 3, which is the part that mainly generates upward light, By excising, providing second and third elliptical reflecting surfaces 41 and 42, facing downward, and further facing the horizontal direction with the first and second parabolic reflecting surfaces, it has an upward component It can be used as irradiation light, and it is possible to realize a brighter vehicle lighting device 1 with the same light source.

1 is a cross-sectional view schematically showing a first embodiment of a vehicular illumination lamp according to the present invention. It is explanatory drawing which shows the relationship between the filament (or arc) of a vertical arrangement | positioning (C-8), and a reflective mirror in the cross section along a major axis. It is explanatory drawing which similarly shows the relationship between the filament of a vertical type | mold, and a reflective surface from the front. It is explanatory drawing which shows the relationship between the filament (or arc) of a horizontal type | mold arrangement | positioning (C-6), and a reflective mirror in the cross section along a major axis. It is explanatory drawing which similarly shows the relationship between the filament of a horizontal type | mold, and a reflective surface from the front. It is explanatory drawing which shows the distribution condition of the basic light by the filament and reflection surface of a vertical arrangement | positioning. It is explanatory drawing about the distribution situation of the basic light by the filament of a horizontal type | mold, and a reflective surface. It is explanatory drawing which shows the example of the state of formation of the light distribution characteristic by the vehicle lighting device which concerns on this invention. It is sectional drawing which shows schematically 2nd embodiment of the vehicle lighting device which concerns on this invention. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle lighting fixture 2 ... Light source 2a ... Filament 3 ... 1st elliptical reflective surface 31 ... 2nd elliptical reflective surface 32 ... 3rd elliptical reflective surface 4 ... 1st light-shielding plate 41 ... 2nd 42 ... 3rd light shielding plate 5 ... Projection lens 6 ... Projector lamp 71 ... 1st parabolic reflection surface 72 ... 2nd parabolic reflection surface

Claims (3)

  One light source, a first elliptical reflecting surface formed as a substantially upper half portion with respect to a major axis set substantially horizontal with the light source as a first focal point, and a first elliptical reflecting surface of the first elliptical reflecting surface A projector lamp comprising a first light-shielding plate installed in the vicinity of two focal points, a projection lens centered on the major axis and having a focal point in the vicinity of the light-shielding plate, and the irradiation direction of the projector lamp A second elliptical reflective surface and a third elliptical system provided with the light source as the first focal point so as to be in the front-rear direction and the second focal point being downward or obliquely downward so that the reflective surface side is substantially opposed. A reflecting surface, a second ellipsoidal reflecting surface, and a third circular reflecting surface are provided with the respective second focal points as focal points, and the reflected light is reflected in substantially the same direction as the irradiation direction of the projector lamp. One parabolic reflecting surface and the second parabolic reflecting surface Vehicle lamp characterized by comprising.   2. The vehicular illumination lamp according to claim 1, wherein the light source is disposed horizontally with respect to the major axis of the first elliptical reflecting surface.   The first parabolic reflection surface and the second parabolic reflection surface are provided with a second light shielding plate and a third light shielding plate that shield the incidence of direct light from the light source. The vehicular illumination lamp according to claim 1 or 2.

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