JP4506720B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a projector-type vehicle headlamp such as a headlamp or a fog lamp. In particular, the present invention relates to a projector-type vehicle headlamp that can effectively use light from a light source and reflected light from a reflecting surface of a reflector.

  This type of projector-type vehicle headlamp has been conventionally used (see, for example, Patent Document 1). Hereinafter, a conventional vehicle headlamp will be described. A conventional vehicle headlamp includes a light source, a reflector having a reflecting surface that reflects light from the light source, a projection lens that projects reflected light from the reflecting surface of the reflector, and a shade. Is.

  Hereinafter, the operation of the conventional vehicle headlamp will be described. When the light source is turned on, the light from the light source is reflected by the reflecting surface of the reflector toward the shade and the projection lens, a part of the reflected light is shielded by the shade, and the remaining reflected light is transmitted from the projection lens to the front of the vehicle. Irradiated with a light distribution pattern.

  The conventional vehicle headlamp can relieve the spot feeling in the hot zone of a predetermined light distribution pattern by the diffusion surface of the reflection surface. However, the conventional vehicle headlamps do not take into account any effective use of the light reflected from the reflecting surface of the reflector, which is light from the light source.

Japanese Utility Model Publication No. 5-75903

  The problem to be solved by the present invention is that the conventional vehicle headlamp does not effectively use the light reflected from the reflecting surface of the reflector, which is the light from the light source.

  According to the present invention (the invention according to claim 1), the reflecting surface of the reflector forms a light distribution pattern that is substantially in the center of the predetermined light distribution pattern and the main reflection surface that forms a light distribution pattern having a substantially outer shape of the predetermined light distribution pattern. The first focal point of the main reflective surface and the first focal point of the sub reflective surface are located in the light emitting part of the light source or in the vicinity thereof, and the second focal point of the main reflective surface is the shade or the same. It is located near and the 2nd focus of a sub reflective surface is located above the 2nd focus of a main reflective surface, It is characterized by the above-mentioned.

  Further, the present invention (the invention according to claim 2) is characterized in that the sub-reflective surface forms a diffuse reflection surface that diffuses and reflects light from the light source.

  Further, according to the present invention (the invention according to claim 3), the boundary between the main reflection surface and the sub reflection surface passes through the light emitting portion of the light source in the radiation direction of the light from the light source and is substantially the same as the optical axis of the main reflection surface. It is located behind the vertical virtual plane.

  In the vehicle headlamp according to the present invention (the invention according to claim 1), the second focal point of the sub-reflecting surface is located above the second focal point of the main reflecting surface located at or near the shade. Since the second focal point of the reflecting surface is located above the second focal point of the main reflecting surface, the reflected light from the sub-reflecting surface can be effectively used without being shielded by the shade. Thereby, the vehicle headlamp of the present invention (the invention according to claim 1) can illuminate the road surface and the like brightly because the light amount (luminous intensity, illuminance, luminous flux, etc.) of the predetermined light distribution pattern increases, The light output of the light source can be reduced to the extent that it can contribute to traffic safety or does not hinder the lighting of the road surface, etc., and can contribute to power saving.

  In the vehicle headlamp of the present invention (the invention according to claim 2), the sub-reflecting surface forms a diffuse reflecting surface that diffuses and reflects light from the light source. The light at the center of the pattern can be diffused around. As a result, the vehicle headlamp according to the present invention (the invention according to claim 2) can increase the total amount of light of the predetermined light distribution pattern, and the center of the predetermined light distribution pattern and its surroundings. The difference in the amount of light can be reduced, a preferable predetermined light distribution pattern can be obtained, and it can contribute to traffic safety.

  Furthermore, in the vehicle headlamp according to the present invention (the invention according to claim 3), the sub-reflecting surface is located substantially at the center of the main reflecting surface and the light emitting portion of the light source is provided by means for solving the above-mentioned problems. Since it is located near, the sub-reflecting surface can efficiently construct the light distribution pattern at the center of the predetermined light distribution pattern. As a result, the vehicle headlamp according to the present invention (the invention according to claim 3) can easily design the light distribution pattern and control the light distribution pattern, and can reduce the manufacturing cost accordingly.

  Embodiments of a vehicle headlamp according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments. In the drawing, reference sign “VU-VD” indicates vertical lines on the upper and lower sides of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. The symbol “MP” indicates the highest light quantity point of the light distribution pattern on the screen. The symbol “Z-Z” indicates the optical axis of the lamp unit (the optical axis of the main reflecting surface, the optical axis of the projection lens).

  Hereinafter, the configuration of the vehicle headlamp according to this embodiment will be described. 1 and 2, reference numeral 1 denotes a vehicle headlamp according to this embodiment. The vehicular headlamp 1 is, for example, a projector-type headlamp that is provided on each of the left and right sides of a front portion of an automobile (vehicle). As shown in FIGS. 1 and 2, the vehicle headlamp 1 includes a discharge lamp 2 as a light source, a reflector 3, a projection lens (condensing lens) 4, a shade 5, a lamp housing ( (Not shown) and a lamp lens or an outer lens (not shown).

  The discharge lamp 2, the reflector 3, the projection lens 4 and the shade 5 constitute a lamp unit. The lamp unit is disposed in a lamp chamber (not shown) defined by the lamp housing and the lamp lens.

  The discharge lamp 2 is a so-called high pressure metal vapor discharge lamp such as a metal halide lamp, a high intensity discharge lamp (HID), or the like. The discharge lamp 2 is detachably attached to the reflector 3 via a socket mechanism 6. The discharge lamp 2 has a light emitting unit 7. In addition to the discharge lamp 2, the light source may be a halogen bulb or an incandescent bulb.

  The reflector 3 is fixedly held by a frame member 8 such as a holder. The reflector 3 has a hollow concave shape that is open on the front side (light irradiation direction side of the vehicle headlamp 1) and closed on the rear side. A circular through hole 9 for inserting the discharge lamp 2 is provided in the center of the closing portion on the rear side of the reflector 3.

  A reflective surface is formed on the inner concave surface of the reflector 3 by vapor deposition of aluminum or silver coating. The reflecting surface of the reflector 3 reflects light from the light emitting portion 7 of the discharge lamp 2 toward the shade 5 and the projection lens 4 with an ellipse as a reference.

  The reflection surface of the reflector 3 is divided into a main reflection surface 10 and a sub reflection surface 11. The main reflection surface 10 constitutes a predetermined light distribution pattern, for example, a light distribution pattern having a substantially outer shape of the light distribution patterns LP1, LP2, LP3 for passing shown in FIGS. 9, 11, and 13 (see FIG. 5). To do. The sub-reflecting surface 11 constitutes a light distribution pattern (see FIGS. 6, 7, and 12) substantially at the center of the passing light distribution patterns LP1, LP2, and LP3.

  An oblique cut-off line, an upper horizontal cut-off line, a lower horizontal cut-off line, and an elbow point are formed on the upper edges of the light distribution patterns LP1, LP2, and LP3 for passing. Here, the upper horizontal cut-off line of the passing light distribution patterns LP1, LP2, and LP3 is located slightly above the horizontal line HL-HR on the left and right of the screen or on the horizontal line HL-HR on the left and right of the screen. Further, the lower horizontal cut-off line of the passing light distribution patterns LP1, LP2, and LP3 is located on the left and right horizontal lines HL-HR of the screen or slightly below the left and right horizontal lines HL-HR of the screen. Further, the elbows of the passing light distribution patterns LP1, LP2, and LP3 are located at the intersections of the oblique cutoff line and the lower horizontal cutoff line.

  The main reflecting surface 10 and the sub-reflecting surface 11 of the reflector 3 are reflecting surfaces such as a free-form surface (NURBS surface) based on an ellipse, for example, a spheroidal surface or an ellipse (see FIG. 1). The vertical cross section is an elliptical surface, and the horizontal cross section of FIG. 2 is a parabolic surface or a reflecting surface having a deformed parabolic surface. For this purpose, the main reflecting surface 10 and the sub-reflecting surface 11 of the reflector 3 have first focal points FM1 and FS1 and second focal points (focal lines on the horizontal section) FM2 and FS2, respectively.

  The free curved surface (NURBS curved surface) of the main reflecting surface 10 and the sub reflecting surface 11 of the reflector 3 is a NURBS free curved surface described in "Mathematical Elemennts for Computer Graphics" (Devid F. Rogers, J Alan Adams). (Non-Uniform Rational B-Spline Surface). The optical axis ZZ of the main reflecting surface 10 of the reflector 3 substantially coincides with the optical axis ZZ of the projection lens 4.

  The first focal point FM1 of the main reflecting surface 10 and the first focal point FS1 of the sub-reflecting surface 11 are located at or near the light emitting unit 7 of the discharge lamp 2. The second focal point FM2 of the main reflecting surface 10 is located at the edge of the shade 5 or in the vicinity thereof. The second focal point FS2 of the sub reflective surface 11 is positioned above the second focal point FM2 of the main reflective surface 10.

  The sub-reflecting surface 11 forms a diffuse reflecting surface that diffuses and reflects the light L1 from the light emitting portion 7 of the discharge lamp 2 to the left and right in the horizontal direction as diffusely reflected light L2. For example, as shown in FIG. 4, the sub-reflection surface 11 forms a diffuse reflection surface in which a substantially vertical cylindrical small concave surface and a small circular convex surface are continuous. The sub-reflection surface 11 may be a diffuse reflection surface other than the diffuse reflection surface shown in FIG. For example, a diffuse reflection surface with a series of substantially vertical cylindrical circular concave surfaces, a diffuse reflection surface with a substantially vertical cylindrical circular convex surface, or a combination of a spherical convex surface and a spherical concave surface, or a sphere For example, a convex diffuse reflection surface or a spherical concave reflection surface. In addition, the unevenness | corrugation of the said sub-reflection surface 11 illustrated in FIG. 4 is exaggeratingly illustrated in the unevenness | corrugation (curvature of an unevenness | corrugation) of an unevenness | corrugation compared with the unevenness | corrugation of the said actual sub-reflection surface 11. The irregularities of the actual sub-reflecting surface 11 are irregularities that cannot be easily identified with the naked eye.

  The boundary 12 between the main reflecting surface 10 and the sub-reflecting surface 11 is the discharge lamp in the radiation direction of the light from the light emitting portion 7 of the discharge lamp 2 as shown by the solid line in FIGS. 2 of the light emitting section 7 (the first focal point FM1 of the main reflecting surface 10 and the first focal point FS1 of the sub-reflecting surface 11), and is substantially perpendicular to the optical axis ZZ of the main reflecting surface 10 It is located behind the surface 13 (see the alternate long and short dash line in FIGS. 1 and 2).

  The projection lens 4 is an aspherical convex lens. The front side of the projection lens 4 forms a convex aspheric surface, while the rear side of the projection lens 4 forms a flat aspheric surface. The projection lens 4 is fixedly held on the frame member 8. The projection lens 4 has a lens focal point (a meridional image plane that is a focal plane on the object space side).

  The shade 5 has a plate structure (in this example, a flat thin steel plate structure) that is inexpensive to manufacture. The shade 5 shields part of the reflected light from the first reflecting surface 10 and the second reflecting surface 11 of the reflector 3 toward the projection lens 4 and passes the light distribution patterns LP1, LP2, LP3 for passing. Is formed. The upper edge of the shade 5 is located along or near the lens focal point of the projection lens 4. The shade 5 is fixedly held on the frame member 8.

  The vehicle headlamp 1 according to this embodiment is configured as described above, and the operation thereof will be described below.

  First, the discharge lamp 2 is turned on. Then, light is emitted from the light emitting portion 7 of the discharge lamp 2. This light is reflected by the main reflecting surface 10 and the sub-reflecting surface 11 of the reflector 3 toward the shade 5 and the projection lens 4. Part of this reflected light is shielded by the shade 5, and the passing light distribution pattern LP3 shown in FIG. 13 is formed by the remaining reflected light. The remaining reflected light travels toward the projection lens 4 and is projected (radiated and irradiated) to the front of the automobile as the passing light distribution pattern LP3 through the projection lens 4.

  At this time, the light distribution pattern shown in FIG. 5 is formed by the reflected light reflected by the main reflecting surface 10. A part of the reflected light reflected by the main reflecting surface 10 is shielded by the shade 5, and a light distribution pattern (not shown) having a substantially outer shape of the passing light distribution pattern LP3 shown in FIG. It is formed. On the other hand, a part of the diffusely reflected light L2 diffusely reflected by the sub-reflecting surface 11 is shielded by the shade 5, and the remaining reflected light is a light distribution pattern at substantially the center of the passing light distribution pattern LP3 shown in FIG. 12). The light distribution pattern formed by the reflected light reflected by the main reflection surface 10 and the light distribution pattern formed by the diffuse reflection light L2 diffusely reflected by the sub-reflection surface 11 (see FIG. 12) are combined. Thus, a passing light distribution pattern LP3 shown in FIG. 13 is formed.

  The vehicle headlamp 1 according to this embodiment has the above-described configuration and action, and the effects thereof will be described below.

  In the vehicle headlamp 1 according to this embodiment, the second focal point FS2 of the sub-reflecting surface 11 is located above the second focal point FM2 of the main reflecting surface 10 located at the edge of the shade 5 or in the vicinity thereof. Therefore, in the vehicle headlamp 1 according to this embodiment, the second focal point FS2 of the sub-reflecting surface 11 is positioned above the second focal point FM2 of the main reflecting surface 10, and the amount from the sub-reflecting surface 11 is increased. The reflected light, that is, the diffuse reflected light L2 can be effectively used without being shielded by the shade 5.

  Here, in the vehicular headlamp 1 according to this embodiment and the conventional vehicular headlamp, the degree of effective use of the light from the light source and the reflected light from the reflecting surface of the reflector is compared. . First, in the conventional vehicle headlamp, the reflecting surface of the reflector is a single reflecting surface (that is, the first focal point and the second focal point of the main reflecting surface are the same as the first focal point and the second focal point of the sub-reflecting surface). And the sub-reflecting surface is a non-diffusive reflecting surface).

  In this conventional vehicle headlamp, the light distribution pattern shown in FIG. 5 is formed by the reflected light reflected by the main reflecting surface, while the light distribution pattern shown in FIG. 6 is formed by the reflected light reflected by the sub-reflecting surface. Is formed. For this purpose, the conventional vehicle headlamp has the light distribution pattern shown in FIG. 8, that is, the light distribution pattern shown in FIG. 5 and the light distribution pattern shown in FIG. The light distribution pattern shown in FIG. 8 obtained by combining the light distribution pattern is obtained. In the conventional vehicle headlamp, a part of the reflected light reflected by the main reflecting surface and the sub-reflecting surface is shielded by the shade, and the remaining reflected light has the passing light distribution pattern LP1 shown in FIG. can get.

  However, the light distribution pattern shown in FIG. 6 has an area with a high amount of light (a large amount of light flux) widely above the horizontal line HL-HR on the left and right of the screen. Therefore, the light distribution pattern shown in FIG. Is widely present above the horizontal line HL-HR on the left and right of the screen. Since most of the high light quantity areas in the light distribution pattern shown in FIG. 8 are shielded by the shade, the light quantity of the passing light distribution pattern LP1 shown in FIG. 9 decreases.

  On the other hand, in the vehicle headlamp 1 according to this embodiment, the reflecting surface of the reflector 3 is divided into the main reflecting surface 10 and the sub reflecting surface 11, and the second focal point of the sub reflecting surface 11 is used. FS2 is located above the second focal point FM2 of the main reflecting surface 10 located at the edge of the shade 5 or in the vicinity thereof.

  In the vehicle headlamp 1 according to this embodiment, the light distribution pattern shown in FIG. 5 is formed by the reflected light reflected by the main reflecting surface 10, while the sub-reflecting surface 11 (not a diffuse reflecting surface but a normal reflecting surface). The light distribution pattern shown in FIG. 7 is formed by the reflected light reflected by the sub-reflection surface of the surface. For this reason, the vehicular headlamp 1 according to this embodiment has reflected light reflected by the main reflecting surface 10 and the sub-reflecting surface 11 (in the case of a sub-reflecting surface that is not a diffuse reflecting surface but a normal reflecting surface). Thus, the light distribution pattern shown in FIG. 10, that is, the light distribution pattern shown in FIG. 10 obtained by combining the light distribution pattern shown in FIG. 5 and the light distribution pattern shown in FIG. The vehicular headlamp 1 according to this embodiment is one of the reflected lights respectively reflected by the main reflecting surface 11 and the sub-reflecting surface 11 (in the case of a sub-reflecting surface that is not a diffuse reflecting surface but a normal reflecting surface). The portion is shielded by the shade 5, and the passing light distribution pattern LP2 shown in FIG. 11 is obtained with the remaining reflected light.

  As described above, the vehicular headlamp 1 according to this embodiment is arranged as shown in FIG. 7 by positioning the second focal point FS2 of the sub-reflecting surface 11 above the second focal point FM2 of the main reflecting surface 10. In the light pattern, an area with a high light amount (a large amount of light flux) can be moved as much as possible below the horizontal line HL-HR on the left and right sides of the screen. For this reason, also in the light distribution pattern shown in FIG. 10, an area with a high light quantity can be moved as far as possible below the horizontal line HL-HR on the left and right of the screen. Since most of the areas with a high light quantity in the light distribution pattern shown in FIG. 10 proceed to the projection lens 4 side without being shielded by the shade 5, the light quantity of the passing light distribution pattern LP1 shown in FIG. 11 increases. That is, since the light shielded by the shade 5 is small, a large amount of the reflected light L2 from the sub-reflecting surface 11 of the reflector 3 that is the light L1 from the light emitting portion 7 of the discharge lamp 2 can be effectively used.

  As a result, the vehicle headlamp 1 according to this embodiment increases the amount of light of the passing light distribution pattern LP2 shown in FIG. 11, so that the road surface and the like can be illuminated brightly, which can contribute to traffic safety. Alternatively, the light output of the discharge lamp 2 can be lowered to an extent that does not hinder illumination such as on the road surface, which can contribute to power saving.

  Further, in the vehicle headlamp 1 according to this embodiment, the sub-reflecting surface 11 has a diffuse reflecting surface that diffuses and reflects the light L1 from the light emitting portion 7 of the discharge lamp 2 to the left and right substantially in the horizontal direction as the diffuse reflected light L2. Therefore, the light distribution pattern shown in FIG. 7 can be obtained by diffusing the light distribution pattern shown in FIG. Note that the light distribution pattern shown in FIG. 12 is the diffuse reflection light L2 from the sub-reflection surface 11, a part of the diffuse reflection light L2 is shielded by the shade 5, and the remaining diffuse reflection light L2 is projected to the projection lens. 4 is a light distribution pattern when projected through 4 to the front of the automobile. The passing light distribution pattern LP3 shown in FIG. 13 is obtained from the light distribution pattern shown in FIG.

  As described above, the vehicular headlamp 1 according to this embodiment surrounds the light at the substantially center of the passing light distribution pattern LP2 (see FIG. 11) in which the amount of light is increased by the sub-reflecting surface 11 forming the diffuse reflecting surface. The light distribution pattern LP3 for passing shown in FIG. 13 is obtained by horizontally diffusing horizontally. As a result, the vehicle headlamp 1 according to this embodiment can increase the overall light amount of the passing light distribution pattern LP3 shown in FIG. 13, and the center of the passing light distribution pattern LP3 shown in FIG. And its surroundings (mainly in the left-right direction) can be reduced, and a preferable light distribution pattern LP3 for passing can be obtained, which can contribute to traffic safety.

  Further, in the vehicle headlamp 1 according to this embodiment, the boundary 12 between the main reflecting surface 10 and the sub-reflecting surface 11 is indicated by a solid line in FIG. 1 and FIG. In the radiation direction of light from the light source, the light source is located behind the virtual surface 13 that passes through the light emitting portion 7 of the discharge lamp 2 and is substantially perpendicular to the optical axis ZZ of the main reflecting surface 10. Therefore, in the vehicle headlamp 1 according to this embodiment, as shown in FIGS. 1 to 3, the sub-reflecting surface 11 is located substantially at the center of the main reflecting surface 10 and the light emitting portion 7 of the discharge lamp 2 is used. Therefore, the sub-reflecting surface 11 can efficiently configure the light distribution pattern at the center of the passing light distribution patterns LP2 and LP3. As a result, the vehicle headlamp 1 according to this embodiment can easily design the light distribution pattern and control the light distribution pattern, and can reduce the manufacturing cost accordingly.

  Furthermore, since the vehicle headlamp 1 according to this embodiment is obtained by dividing the reflecting surface of the reflector 3 into a main reflecting surface 10 and a sub reflecting surface 11, the sub reflecting surface 11 is separated from the main reflecting surface 10. Can be freely designed and manufactured. For this reason, the vehicle headlamp 1 according to this embodiment can reliably and effectively use the reflected light L2 from the sub-reflecting surface 11 that is the light from the light emitting portion 7 of the discharge lamp 2. Further, in the vehicle headlamp 1 according to this embodiment, the highest light quantity points MP of the passing light distribution patterns LP2 and LP3 can be positioned at arbitrary positions as shown in FIGS.

  Hereinafter, examples other than the above embodiment will be described. In the above embodiment, a headlamp is described as a vehicle headlamp. However, in the present invention, the vehicle headlamp may be a lamp other than the headlamp, such as a fog lamp.

  In the above-described embodiment, a projector type headlamp capable of obtaining the passing light distribution patterns LP2 and LP3 as the predetermined light distribution pattern will be described. However, in the present invention, the obtained predetermined light distribution pattern is not particularly limited. For example, the predetermined light distribution pattern may be, for example, a highway light distribution pattern, a traveling light distribution pattern, a wet road light distribution pattern, or a bad weather light distribution pattern.

  Furthermore, in the above embodiment, the sub-reflecting surface 11 is a diffuse reflecting surface. However, in the present invention, the sub-reflecting surface may be a normal reflecting surface (a reflecting surface based on an ellipse having the first focal point FS1 and the second focal point FS2) instead of the diffuse reflecting surface. In this case, the light distribution pattern shown in FIG. 7 is obtained by the reflected light from the sub-reflecting surface, and the light distribution pattern shown in FIG. 10 is synthesized with the light distribution pattern shown in FIG. 5 obtained by the reflected light from the main reflecting surface. As a result, a passing light distribution pattern LP2 shown in FIG. 11 is obtained.

  Furthermore, in this embodiment, the main reflecting surface 10 and the sub-reflecting surface 11 are respectively provided in the single reflector 3. However, in the present invention, the main reflection surface and the sub reflection surface may be provided in separate reflectors.

It is a longitudinal cross-sectional view (vertical cross-sectional view) of the lamp unit which shows the Example of the vehicle headlamp concerning this invention. Similarly, it is a cross-sectional view (horizontal cross-sectional view) showing the lamp unit. Similarly, it is a front view which shows the main reflective surface and sub-reflective surface of a reflector. Similarly, it is the IV-IV sectional view taken on the line in FIG. Similarly, it is explanatory drawing which shows the light distribution pattern formed with the reflected light from a main reflective surface. It is explanatory drawing which shows the light distribution pattern formed by the reflected light from a sub reflective surface when the reflective surface of a reflector is a single reflective surface. Similarly, it is explanatory drawing which shows the light distribution pattern formed with the reflected light from the sub-reflection surface which is not a diffuse reflection surface. It is explanatory drawing which shows the light distribution pattern by which the light distribution pattern shown in FIG. 5 and the light distribution pattern shown in FIG. 6 were synthesize | combined. It is explanatory drawing which shows the light distribution pattern for passing based on the light distribution pattern shown in FIG. Similarly, it is explanatory drawing which shows the light distribution pattern by which the light distribution pattern shown in FIG. 5 and the light distribution pattern shown in FIG. 7 were synthesize | combined. Similarly, it is explanatory drawing which shows the light distribution pattern for passing based on the light distribution pattern shown in FIG. Similarly, it is explanatory drawing which shows the light distribution pattern formed with the reflected light from the sub-reflection surface which is a diffuse reflection surface, and was not shielded by the shade. Similarly, it is explanatory drawing which shows the light distribution pattern which consists of the light distribution pattern formed with the reflected light from the main reflective surface, and the light distribution pattern formed with the reflected light from the sub-reflection surface which is a diffuse reflection surface.

Explanation of symbols

1 Vehicle headlamp 2 Discharge lamp (light source)
DESCRIPTION OF SYMBOLS 3 Reflector 4 Projection lens 5 Shade 6 Socket mechanism 7 Light emission part 8 Frame member 9 Through-hole 10 Main reflective surface 11 Sub reflective surface 12 Boundary 13 Virtual surface LP1, LP2, LP3 Light distribution pattern for passing HL-HR Left and right horizontal line VU- VD Vertical line ZZ Optical axis of main reflection surface, optical axis of projection lens MP Maximum light quantity point FM1 First focus of main reflection surface FM2 Second focus of main reflection surface FS1 First focus of sub reflection surface FS2 Sub Second focal point of reflecting surface L1 Light from light emitting part of discharge lamp to sub-reflecting surface L2 Diffuse reflected light from sub-reflecting surface

Claims (3)

In projector-type vehicle headlamps,
A light source;
A reflector having a reflecting surface with an ellipse as a reference, and reflecting light from the light source;
A projection lens that projects forward the reflected light from the reflecting surface of the reflector;
A shade that shields a part of reflected light from the reflecting surface of the reflector toward the projection lens to form a predetermined light distribution pattern;
With
The reflective surface is divided into a main reflective surface that constitutes a light distribution pattern having a substantially outer shape of the predetermined light distribution pattern, and a sub-reflective surface that constitutes a light distribution pattern that is substantially in the center of the predetermined light distribution pattern. And
The first focal point of the main reflecting surface and the first focal point of the sub-reflecting surface are located at or near the light emitting portion of the light source,
The second focal point of the main reflecting surface is located at or near the shade;
A second focal point of the sub-reflecting surface is located above the second focal point of the main reflecting surface;
A vehicle headlamp characterized by that.   The vehicular headlamp according to claim 1, wherein the sub-reflection surface forms a diffuse reflection surface that diffuses and reflects light from the light source.   The boundary between the main reflecting surface and the sub-reflecting surface is behind the virtual plane that passes through the light emitting portion of the light source and is substantially perpendicular to the optical axis of the main reflecting surface in the light emission direction from the light source. The vehicle headlamp according to claim 1, wherein the vehicle headlamp is located.

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