JP4323468B2 - Automotive headlamps - Google Patents

Description

  The present invention relates to an automobile headlamp, and more particularly, to improve the performance by improving the luminous flux utilization factor for the light source, and to enable a novel design that is unprecedented in appearance. The purpose is to provide lights.

  FIGS. 12 to 14 show examples of the configuration of the conventional lamp of this type. First, in the lamp 90 shown in FIG. 12, as a basic configuration, a paraboloid of revolution in which a light source 91 is disposed at a focal position. A reflecting mirror 92 and a lens 93 provided with a lens cut 93a are used. Reflected light of substantially parallel rays is obtained by the rotary paraboloid reflecting mirror 92, and the reflected light is appropriately obtained by the lens cut 93a of the lens 93. To obtain desired light distribution characteristics.

  In the lamp 80 shown in FIG. 13, a parabola with a focus on the light source 81 appears in the vertical section in the mounted state of the lamp 80, and a parabola column in which a straight line appears in the horizontal section (shown state). It is composed of a composite reflecting surface 82 in which a plurality of reflecting surfaces are combined and a lens 83 that is not subjected to lens cutting and is transparent, and obtains light distribution characteristics with the composite reflecting surface 82 itself. is there.

  Further, in the lamp 70 shown in FIG. 14, a rotating ellipsoidal reflecting surface or composite ellipsoidal surface having the light source 71 as a first focal point, an elliptical reflecting surface 72 having an elliptical free-form surface, an aspherical lens 73, and as necessary. The illumination light is obtained by enlarging and projecting the light source image generated by focusing on the second focal point with the aspherical lens 73. The shade 74 covers the unnecessary portion at this time. The required light distribution characteristic shape is obtained. The lamp 70 that employs the elliptical reflecting surface 72 is referred to as a projector type.

  However, in the above-described conventional configuration, the configuration of the lamp 90 shown in FIG. 12 requires that the lens cut 93a be optically so-called, and this causes the lens 93 to have a large change in thickness. As a result, there is a problem that the transparency that is currently preferred in the market and the appearance with excellent depth cannot be obtained.

  Further, in the lamp 80 shown in FIG. 13, since the lens 83 has a transparent shape without being subjected to lens cut, it is surely possible to obtain an appearance with excellent transparency, but is relatively deep. Since the light distribution characteristic is formed by the composite reflecting surface 82 at the position, it is difficult to secure the right and left width of the light distribution characteristic.

  Further, the lamp 70 shown in FIG. 14 has a problem that the depth becomes deep and makes installation difficult, and the outer diameter of the aspherical lens 73 is small, and this lamp 70 is employed as a headlamp. Sometimes, since the light emitting area is small, there is a problem that the visibility from the oncoming vehicle is poor.

  In addition, since the lamps 90, 80, 70 having the conventional configuration are widely used, it is difficult to differentiate from others, and it is difficult to obtain novelty in terms of design. In the lamps 90 to 70 having the conventional configuration, the luminous flux utilization rate with respect to the light source depends on the area of the reflecting mirror. Therefore, the brightness becomes extremely low when the thickness is reduced or one of the vertical and horizontal dimensions is reduced due to market demands. There has also been a problem of a decrease.

The present invention provides, as specific means for solving the above-described conventional problems, a first reflecting surface focused on the vicinity of a light source, and a first focus on the vicinity of the light source, and the light from the light source as the first light source. An elliptical reflecting surface that converges near the second focal point at an appropriate position of the reflecting surface, an inlet formed near the second focal point of the elliptical reflecting surface, and an outlet formed outside the first reflecting surface A hollow cylindrical light guide path portion that is provided on the first reflection surface and the entrance and the exit are spaced apart from each other by a predetermined distance so that the inner surface is subjected to a reflection treatment to reflect the inner surface, and the light guide path portion A second reflecting surface that is a paraboloidal reflecting surface that reflects light from the light guide path portion with a focus on the vicinity of the exit, and the light guide path portion has the entrance at the entrance as the second focus. The light focused by the ellipsoidal reflecting surface is propagated to the outlet by internal reflection, and the light reaches the outlet. Produce a virtual image by the light from the light source specified by the mouth shape, the second reflective surface, the virtual image and light collected by the second focus of the elliptical reflective surface that directly pass through the light guide portion The problem is solved by providing an automotive headlamp characterized by being reflected and projected as light from the light guide section .

  As described above, according to the present invention, the light guide path portion reaching the back side is provided at an appropriate position in the left-right direction with respect to the light source of the first reflecting surface which is a paraboloidal system and the light source is disposed at a substantially focal position. Each of the first reflecting surfaces is provided with a second reflecting surface of a paraboloidal system focusing on the vicinity of the exit of each light guide section on the left and right outer sides of the first reflecting surface. A pair of elliptical third reflecting surfaces having a light source as the first focal point and a second focal point near the entrance of each light guide section are provided in the vicinity of the optical axis. By using an automotive headlamp equipped with a lens, light that has not been captured by the first reflecting surface, which has not been used in terms of performance, is collected by the third reflecting surface, and the light guide path The light flux for the light source is used for irradiation in the irradiation direction on the second reflecting surface via the Rate improves, the more even the same source as a light automotive headlamp, in which exhibits the excellent effect for improving the performance.

  In addition, in the design surface, for example, when the height of the first reflecting surface is reduced in the vertical direction, and the amount of light flux captured on the first reflecting surface is reduced, the decrease amount is the third reflecting surface. Can be recovered and used as irradiating light on the second reflecting surface. Therefore, a novel design that is impossible in the past, for example, the height of the lens is about 30 mm without sacrificing performance as a headlamp. As a result, it is very effective in improving the merchantability.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. In order to facilitate understanding, in this embodiment, the second reflecting surface is provided as a pair of the left and right sides of the first reflecting surface in the horizontal direction, and the light guide path portion and the third reflecting surface are also provided in the second reflecting surface. The present invention will be described using an example corresponding to a surface, but the present invention does not limit the number and position of the second reflecting surface, and therefore the number and position of the light guide section and the third reflecting surface are also limited. Is not to be done.

  What is shown in FIG. 1 is a first embodiment of the present invention, and what is denoted by reference numeral 1 in the figure is an automotive headlamp according to the present invention. This automotive headlamp is formed by using a light source 2, a first reflecting surface 3, a second reflecting surface 5, a third reflecting surface 6 and a lens 7 provided with a light guide path 4 as main components. Yes.

  The first reflecting surface 3 is a parabolic reflecting surface called a rotating paraboloid or a free-form surface having the light source 2 as a substantially focal position, and collimates the light from the light source 2. Alternatively, it is reflected in the irradiation direction as having an appropriate expansion, and is transmitted through the lens 7 to perform illumination, and performs substantially the same action as that shown in FIG. 12 or FIG. 13 of the conventional example. .

  Here, when a metal halide discharge lamp is adopted as the light source 2, the light emitted from the lower half side of the light source 2 is often colored. In this case, the light from the first reflecting surface 3 is used. The axis P is set below the center of the vertical width of the first reflecting surface 3, and measures are taken such as to capture more light emitted from the upper half side of the light source 2.

  The first reflecting surface 3 is provided with a light guide path 4, which is related to the second reflecting surface 5 and the third reflecting surface 6, position, shape, etc. Therefore, the details will be described later in the detailed description of the second reflecting surface 5 and the third reflecting surface 6.

  The second reflecting surface 5 is a parabolic reflecting surface having one focal point F5 such as a rotating parabolic surface or a free-form surface like the first reflecting surface 3, and the focal point F5 is the light guide path part. 4 is provided in the vicinity of the outlet 4b. The optical axis Q of the second reflecting surface 5 is basically parallel to the optical axis P of the first reflecting surface 3.

  And since the said 2nd reflective surface 5 shall be each provided in the left-right outer side of the said 1st reflective surface 3 in the attachment state to the vehicle of this vehicle headlamp 1, the said light guide path part Correspondingly, 4 is also provided at two locations on the first reflecting surface 3. In this embodiment, the following description will be made assuming that the two light guide path portions 4 are provided as symmetrical positions with respect to the vertical line passing through the light source 2.

  The third reflecting surface 6 basically has an ellipse having the light source 2 or the vicinity thereof as a first focal point and the entrance 4a of the light guide section 4 or the vicinity thereof as a second focal point F6. Although it is formed as a spheroid surface obtained by rotating with a long axis passing therethrough, the light guide path portion 4 is provided at two locations on the first reflecting surface 3 as described above. Therefore, the third reflecting surface 6 is also a pair.

  At this time, since the pair of the third reflecting surfaces 6 both have the light source 2 as the first focal point, they exist inside the first reflecting surface 3 having the same light source 2 as the focal point, A portion that interferes with the first reflecting surface 3 is generated. Also, the pair of third reflecting surfaces 6 interfere with each other.

  Therefore, when the third reflecting surface 6 is formed, the light distribution of the light source 2 with the first reflecting surface 3 must be taken into consideration. Basically, the light from the light source 2 is the first reflecting surface 3. The luminous flux in the range reaching the reflecting surface 3 is cut off by the third reflecting surface 6 and reflected by the first reflecting surface 3, and the third reflecting surface 6 guides the light in the portion where the first reflecting surface 3 does not exist. It is made to focus on the inlet 4a of the part 4. FIG. In addition, it is assumed that the interference portion between the third reflecting surfaces 6 is not cut, so that interference does not occur.

  Here, when examining the configuration of this type of vehicle headlamp 1, direct light from the light source 2 reaches an oncoming vehicle and the like and does not cause dazzling, and is unnecessary when forming light distribution characteristics. Usually, a hood for shielding a portion of the reflecting surface that is a place where the reflected light is generated is provided.

  Since the third reflecting surface 6 mainly uses light that does not reach the first reflecting surface 3 as described above, the light captured by the third reflecting surface 6 is obtained by a conventional hood. Therefore, if the third reflecting surface 6 captures the light that is not preferable to reach the first reflecting surface 3, the hood functions as well. It will be the same thing.

  Further, in the case of a discharge lamp light source called D2R type, a light shielding film is directly provided on the bulb of the discharge lamp light source in order to make it easy to obtain a passing light distribution. If a discharge lamp without a film is used, and the light of this portion is also captured and collected by the third reflecting surface 6, the luminous flux utilization rate can be further improved. Moreover, even if the portion corresponding to the light shielding film is simply shielded by the third reflecting surface 6, it is not necessary to prepare two types of discharge lamp light sources for right-hand traffic and left-hand traffic, thereby streamlining production.

  A lens 7 is provided to cover the front of the light source 2, the first reflecting surface 3, the second reflecting surface 5, and the third reflecting surface 6 configured as described above, and the first reflecting surface 3 and the second reflecting surface 6. When the reflecting surface 5 is a paraboloid, the lens 7 is subjected to lens cut 7a to form a light distribution characteristic, and the first reflecting surface 3 and the second reflecting surface 5 are free-form surfaces. In some cases, the light distribution characteristics are directly formed by the reflected light from the reflecting surfaces 3 and 5, and the lens 7 substantially eliminates the need for a lens cut.

  Here, if the result of the trial manufacture and examination by the inventor for forming the present invention is described, the light focused near the entrance 4a of the light guide path 4 by the third reflecting surface 6 propagates in the light guide path 4 It has been found that reflection occurs on the inner surface before reaching the outlet 4b, and that there is a loss of regularity with respect to the directionality or the like when radiated from the outlet 4b.

  Therefore, in actual implementation, as shown in FIG. 2 as a second embodiment, upward light is generated even when light that partially loses regularity is reflected on the second reflecting surface 5 as described above. In order to prevent this, it has been confirmed that it is preferable to set the optical axis Q downward about 2 ° with respect to the irradiation direction.

  Next, the operation and effect of the automotive headlamp 1 having the above-described configuration will be described. According to the present invention, a third reflecting surface 6 that is a spheroidal surface is provided, and light from the light source 2 that is not captured by the first reflecting surface 3 is reflected to the second reflecting surface 5 via the light guide path 4 to irradiate light. As a result, it is possible to realize a brighter headlamp with the same light source 2.

  As for the appearance surface, in the conventional example, for example, when the vertical width of the reflecting surface is reduced, it is inevitable that the headlamp becomes dark according to the decrease in the area of the reflecting surface. Since the amount of the reduced area of the reflective surface 3 can be recovered by the third reflective surface 6 and distributed to the second reflective surface 5, the brightness does not decrease so much. The vertical width of the lens 7 is, for example, about 30 mm, and it is possible to realize the automotive headlamp 1 having a novel design that is impossible in the past.

  Here, in the previous first embodiment, the light guide path portion 4, the second reflecting surface 5, and the third reflecting surface 6 are each provided as a pair and in the left-right direction. 4. The number and position of the second reflecting surface 5 and the third reflecting surface 6 are not limited, and their setting is free.

  For example, in the case where a composite lamp with an auxiliary headlamp (fog lamp) provided near the inner side of the vehicle body is employed, if the second reflecting surface 5 is provided on the left and right outer sides of the first reflecting surface 3, the headlamp is used. The area occupied by becomes excessive, and the space for providing the auxiliary headlamp described above is lost.

  In such a case, in the vehicular headlamp 1, the second reflecting surface 5 is, for example, closer to the outside of the vehicle body, as shown in FIG. Therefore, the light guide path 4 and the third reflecting surface 6 may be provided one by one to secure a space for providing the auxiliary headlamp.

  Further, even when the second reflecting surfaces 5 are provided as a pair, they are not limited to the left and right, and illustration is omitted. For example, the vehicular headlamp 1 shown in the first embodiment is an optical axis. If the lens cut 7a applied to the lens 7 is changed by rotating 90 ° about P as a center, the vehicle headlamp 1 having a vertically long shape can be obtained.

  Furthermore, it is possible to provide the second reflecting surface 5 as two or more locations. For example, as shown in the fourth embodiment in FIG. 4, the second reflecting surface 5 is provided as three surfaces, for example, one location on the upper side and two locations on the lower side. It is good. In this case, as a matter of course, the same number of the light guide path portions 4 and the third reflection surfaces 6 as the second reflection surfaces 5 are provided corresponding to the second reflection surfaces 5.

  In the first to fourth embodiments described above, when there are a plurality of the second reflecting surfaces 5, these second reflecting surfaces 5 are basically set to have the same front-rear position in the direction along the optical axis P. However, the present invention is not limited to this. That is, in the fifth embodiment shown in a horizontal section in FIG. 5, the second reflecting surfaces 5 provided on the left and right outer sides of the first reflecting surface 3 are shifted forward and backward.

  Accordingly, the light guide path portion 4 and the third reflection surface 6 are also provided with asymmetric left and right. By doing in this way, even when the lens 7 is designed as a curved shape that goes around to the side of the car body, the first reflecting surface 3 and the second reflecting surface over the entire rear surface of the lens 7. 5 can be arranged, so that even the curved lens 7 can emit light almost entirely.

  FIGS. 6 and 7 show the sixth embodiment of the automotive headlamp 1 according to the present invention as a main part, and the sixth embodiment relates to the position where the light guide path portion 4 is provided. As a result of the inventor's investigation, when the spheroid having a large dimensional ratio between the major axis and the minor axis of the spheroid is adopted as the third reflecting surface 6, the amount of interference with the first reflecting surface 3 is reduced. It has been found that the amount of light captured by the third reflecting surface 6 tends to increase because the number of notches improves.

  Further, as described above, when a discharge lamp is employed as the light source 2, the optical axis P of the first reflecting surface 3 is set downward, so that the long axis is set to be long. It is preferable to set the height to be equal to or higher than the horizontal line H passing through the optical axis P. If it is provided at the upper end of the first reflecting surface 3 (see FIG. 6) as shown in the drawing, the length can be maximized. .

  As shown in FIG. 7, the major axis of the spheroid forming the third reflecting surface 6 is moved in the front-rear direction with respect to the optical axis P of the first reflecting surface 3. However, it can be changed, but when moved forward (angle -α direction in the figure), the length of the major axis can be increased, but the amount of interference between the first reflecting surface 3 and the third reflecting surface 6 increases, The notch has to be increased and the effect is not as good.

  When moving backward (in the illustrated angle + α direction), the long axis becomes shorter, and the amount of interference between the first reflecting surface 3 and the third reflecting surface 6 is reduced. The amount of interference increases between the reflecting surface 3 and the second reflecting surface 5, and the effect is not obtained. Therefore, in the present invention, the range in which the angle α is ± 45 ° is set as an appropriate value with the horizontal line passing through the light source 2 as a reference.

  Here, when the light guide path 4 is provided near the upper end of the first reflecting surface 3 above the light source 2, the reflected light generated by the third reflecting surface 6 is generally upward. Here, if the reflected light from the third reflecting surface 6 reaches the first reflecting surface 3, the reflected light also becomes upward and becomes dazzling light.

  In the present invention, in order to prevent the occurrence of the above-mentioned dazzling light, the position of the light guide path portion 4 provided to the lens 7 is also restricted. As shown in FIG. By making it coincide with the lower end of the entrance 4a of 4 or less, the upward light from the third reflecting surface 6 reaching the first reflecting surface 3 reaches the lens 7 and is emitted to the outside. Prevents generation of dazzling light as if there is no light.

  Further, the above-mentioned dazzling light can be prevented by changing the shape of the ceiling plate 3a of the first reflecting surface 3, and as shown in FIG. 8 as the seventh embodiment, the ceiling plate 3a is reflected by the first reflection. If the tangent line along the traveling direction of the reflected light from the surface 3 has a downward slope, that is, if it is formed as a suitable curved surface protruding toward the inside of the first reflecting surface 3, this ceiling plate 3a The upward light that is reached is converted downward and does not become dazzling light. At this time, if the gradient of the tangent for each location of the ceiling plate 3a is appropriately adjusted, the reflected light can reach any point on the light distribution characteristics.

  FIG. 9 shows an eighth embodiment of the present invention as a main part, and as described above, in the configuration of the present invention, the second reflecting surface 5 has the focal point F5 at the position of the outlet 4b of the light guide section 4. It is formed as a rotating paraboloid. That is, since the position where the second reflecting surface 5 is provided is determined by the outlet 4b of the light guide path section 4, depending on the position of the outlet 4b, there are many portions overlapping the first reflecting surface 3, There is a possibility that the reflected light from the reflecting surface 5 cannot be used effectively.

  In view of the above situation, in the present invention, the light guide path portion 4 is formed in a substantially cylindrical shape so that a free space is provided between the inlet 4a and the outlet 4b. If it is expanded, the second reflecting surface 5 can be provided on the outer side, and interference with the first reflecting surface 3 can be reduced.

At this time, in order to prevent the occurrence of loss of light at the light guide path section within 4 it has good by performing a reflection process for forming a reflective surface 4c, etc. on the inner surface of the light guide path portion 4 for example, aluminum deposition.

  In addition, in the present invention, a preferable shape is also provided for the outlet 4b. As described above, the outlet 4b of the light guide section 4 serves as a light source for the second reflecting surface 5. It will bear. Accordingly, the plane formed by the outlet 4b is a plane having a normal D as a straight line orthogonal to the optical axis Q of the second reflecting surface 5, and more preferably, the shape of the outlet 4b is the optical axis as shown in FIG. If the rectangular shape has a long side along Q, the virtual image of the light source 2 generated at the exit 4b exists in the same longitudinal direction on the optical axis Q as in the case of the so-called C-8 filament. To be.

  Therefore, since the shape of the reflected light generated by the second reflecting surface 5 is similar to that of the C-8 filament, for example, a lens cut applied to the position corresponding to the second reflecting surface 5 of the lens 7 is designed. In this case, since it is possible to cope with the application of the prior art, no particularly difficult technology is generated even when the present invention is implemented, and the implementation can be easily performed.

  FIG. 11 shows a ninth embodiment of the present invention. In the present invention, the shape of the first reflecting surface 3 is that of the first reflecting surface 3 itself, even if it is a paraboloid that generates parallel reflected light. However, it is also possible to adopt a paraboloidal free-form surface that generates reflected light having a shape with a light distribution characteristic. Here, when a free-form surface is adopted, the direction of the reflected light at each part of the reflecting surface can be freely set to some extent.

  Using this characteristic, the first reflecting surface 3 is a free-form surface, and the reflected light is directed outward in the vicinity where the third reflecting surface 6 exists, that is, in the vicinity of the center (optical axis P). If the third reflecting surface 6 does not interfere with the reflected light from the first reflecting surface 3, the left and right width W1 at the position on the front side from the light source 2 is set to the rear side from the light source 2. It becomes possible to make it wider than the left-right width W2 of the reflecting surface at the position.

Here, since the reflection surface at the position on the front side from the light source 2 of the third reflection surface 6 is a place for capturing light from the light source 2 that has not been captured by the first reflection surface 3, this position. When the left and right width W1 is increased, that is, the amount of light flux captured by the light source 2 is increased, so that a brighter lamp can be realized for the same light source 2.
The present invention includes the following embodiments as other embodiments.

(1) At least one of the light guide portions reaching the back side is provided at an appropriate position of the first reflecting surface which is a paraboloidal system and the light source is disposed at a substantially focal position, and the first reflecting surface A parabolic second reflection surface is provided on the outer side corresponding to the light guide path portion, and the light of the light source is disposed in the vicinity of the optical axis of the first reflection surface in the vicinity of the light guide path portion. 3. A vehicle headlamp characterized in that a third reflecting surface that is substantially focused and provided is provided, and a lens is provided in front of the first and second reflecting surfaces in the irradiation direction.
(2) The automotive headlamp according to claim 1, wherein the second reflecting surface has a focal point set in the vicinity of the light guide path.
(3) The third reflecting surface according to claim 1 or 2, wherein the third reflecting surface is an elliptic system having the light source as a first focal point and the vicinity of the entrance of the light guide path part as a second focal point. Automotive headlamp.
(4) The automotive headlamp according to any one of claims 1 to 3, wherein the third reflecting surface also serves as a hood for the light source.
(5) The optical axis of each of the second reflecting surfaces is substantially parallel to at least one of the horizontal and vertical sections with respect to the optical axis of the first reflecting surface. The automotive headlamp according to claim 4.
(6) The optical axis of the second reflecting surface is set to be approximately 2 ° downward with respect to the optical axis of the first reflecting surface. The automotive headlamp described.
(7) The light guide section is above the horizontal line passing through the light source and perpendicular to the optical axis with respect to the mounting state of the automotive headlamp, and before and after the light source as the origin with respect to the horizontal line The automotive headlamp according to any one of claims 1 to 6, wherein the automotive headlamp is provided within a range of 45 °.
(8) The automobile light guide according to any one of claims 1 to 7, wherein the light guide path portion has a substantially cylindrical shape with an appropriate interval between the entrance and the exit. Headlight.
(9) The exit of the light guide path part includes at least a plane orthogonal to a straight line orthogonal to the optical axis of the second reflecting surface. Item 9. A headlamp for an automobile according to any one of Items 8 to 8.
(10) The shape of the exit of the optical path portion is adjusted to be appropriate for the shape of the light distribution characteristic required for the second reflecting surface. Item 10. A headlamp for an automobile according to any one of Items 9 to 9.
(11) The upper end of the light guide path portion coincides with at least one of the upper end of the first reflecting surface and the upper end of the second reflecting surface. The automotive headlamp described in Crab.
(12) The automotive headlamp according to any one of claims 1 to 11, wherein an upper end of the effective portion of the lens is coincident with or lower than a lower end of the light guide path portion. .
(13) The top plate portion of the first reflecting surface protrudes toward the inside of the first reflecting surface so as to reflect the upward light that has reached the first reflecting surface and reflected as horizontal or downward light. The automotive headlamp according to any one of claims 1 to 12, wherein the automotive headlamp is formed as a convex curved surface.
(14) The automotive headlamp according to any one of claims 1 to 13, wherein an inner surface of the light guide path portion is subjected to a reflection treatment.
(15) The automotive headlamp according to any one of claims 1 to 14, wherein the inner surface of the light guide path portion is filled with a light guide member.
(16) The first reflecting surface is a free-form surface of a paraboloid system, and the third reflecting surface is formed such that a left-right width on the front side from the light source is larger than a left-right width on the rear side from the light source. The automotive headlamp according to any one of claims 1 to 15, wherein the automotive headlamp is provided.

1 is a perspective view showing a first embodiment of an automotive headlamp according to the present invention in a partially exploded state. It is sectional drawing which shows the 2nd embodiment of the headlamp for motor vehicles based on this invention similarly by the principal part. It is sectional drawing which similarly shows 3rd embodiment of the headlamp for motor vehicles based on this invention. It is a front view showing a fourth embodiment of the automotive headlamp according to the present invention. It is sectional drawing which similarly shows 5th embodiment of the automotive headlamp which concerns on this invention. It is a front view which shows 6th embodiment of the headlamp for motor vehicles similarly similarly based on this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which similarly shows 7th embodiment of the headlamp for motor vehicles based on this invention. It is sectional drawing which shows 8th Embodiment of the headlamp for motor vehicles based on this invention by the principal part. It is sectional drawing which follows the BB line of FIG. It is explanatory drawing which shows 9th embodiment of the headlamp for motor vehicles based on this invention similarly by the principal part. It is sectional drawing which shows a prior art example. It is sectional drawing which shows another prior art example. It is sectional drawing which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Automotive headlamp 2 …… Light source 3 …… First reflective surface 3a …… Ceiling plate 4 …… Light guide section 4a …… Inlet 4b …… Outlet 4c …… Reflective surface 5 …… Second Reflective surface 6 ... Third reflective surface 7 ... Lens 8 ... Light guide member

Claims (5)

A first reflecting surface focused on the vicinity of the light source;
Focusing the light of the light source to the vicinity of the light source and the first focal point to a second focal point at the appropriate position on the first reflecting surface, and the elliptic reflecting surface,
An entrance formed near the second focal point of the elliptical reflective surface and an exit formed outside the first reflective surface, the entrance and the exit provided on the first reflective surface being predetermined. A hollow cylindrical light guide path portion that is separated by a distance and is subjected to a reflection treatment on the inner surface to enable inner surface reflection,
A second reflecting surface that is a parabolic reflecting surface that focuses on the vicinity of the exit of the light guide portion and reflects light from the light guide portion, and
The light guide portion is
Propagating light converged by the elliptical reflecting surface with the entrance as the second focal point at the entrance to the exit by internal reflection to produce a virtual image due to light from the light source specified by the exit shape at the exit,
The second reflecting surface is
The virtual image and headlamp vehicle, characterized in that reflected and projected as light the light collected by the second focus of the elliptical reflective surface that directly passes through the light guide path portion from the light guide portion. The shape of at least a part of the outlet of the light guide path is
2. The automotive headlamp according to claim 1, wherein the automotive headlamp has a rectangular shape having a long side along the optical axis of the light source. The optical axis of the second reflecting surface is
The automotive headlamp according to claim 1, wherein the automotive headlamp is set downward with respect to the irradiation direction of the lamp. The light guide portion is
The automotive headlamp according to any one of claims 1 to 3, wherein the automotive headlamp is provided above an optical axis of the light source when viewed from the vertical section. The elliptical reflecting surface is
The automotive headlamp according to any one of claims 1 to 4, wherein the automotive headlamp is formed of a spheroid having a large dimensional ratio between a major axis and a minor axis.

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