JPS6141082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a headlamp for a vehicle, in particular a headlamp in which the upper and lower parts of the reflector are not on a continuous surface, i.e. there is a step between the upper and lower reflector parts, i.e. they are separated. This invention relates to a vehicle headlamp with a line surface.

It is known to provide parabolic mirrors in vehicle headlamps. However, in order to use the headlamp in the downward beam state when driving, rather than in the main beam state, that is, the full beam state, the lower half of the reflector must be shielded so that the light emitted from the filament of the light bulb attached to the headlamp is reflected. It is necessary to avoid reflections at the bottom of the mirror. In this way, the shield is designed appropriately to cut off the top of the beam,
The desired cutoff is produced. However, such a configuration reduces the light output of the headlamp in the downward position. In normal cases, this reduction in light output is undesirable. To solve this problem, it is known to provide a compound reflector consisting of an upper parabolic section and a lower parabolic section separated by a plane or step of the dividing line. In the configuration of the top and bottom of the reflector for the filament used in the downward position, light from the filament that is incident on the bottom of the reflector is reflected downward rather than upward, and therefore the light between the top and bottom of the reflector is increasing the beam below the cut-off defined by the plane or step of the dividing line between. However, it has been found that the use of such a reflector construction in conjunction with a halogen bulb produces miscellaneous reflections and increases the intensity of the light above the desired cut-off to the top of the beam projected by this headlamp. . Such miscellaneous reflections increase the glare to an unacceptable level. It was found that there are two causes for these miscellaneous reflections of light. The first cause is due to the layer of lacquer on the reflective surface. A layer of lacquer is necessary to create the necessary mirror surface of the reflector. However, lacquers tend to form beads that extend along the plane or step of the parting line. This compromises the sharp edges required for sharp cutoffs. Second
The cause lies in the quartz tube used to house the filament inside the halogen bulb. Simply applying matte black paint to the face of the parting line, or the edge of the step, produces a sharp cut-off and prevents the miscellaneous reflections caused by the lacquer bead, but not from reflections in the quartz tube of a halogen bulb. The problem of high glare levels cannot be completely solved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle headlamp which solves the problem of high glare levels resulting from reflections in the quartz tube of a halogen bulb without substantially affecting the total light output of the headlamp in the downward position.

The headlamp for a vehicle of the present invention comprises a reflector having an upper reflecting part and a lower reflecting part separated by a plane of a dividing line, and a filament shielding body. The filament shield is constituted by a pair of plate-like parts, each of the plate-like parts is in line with the dividing line between the upper reflecting part and the lower reflecting part, and the reflecting mirror extending each said plate-like portion approximately axially forward of said plate-like portion, and in addition to the ambiguity caused by the inner edge of said plate-like portion, the ambiguity of said reflector due to light directly emanating from said filament; The outer end edge of each of the plate-shaped portions is made thicker than the inner end edge by an amount that prevents the occurrence of the problem.

In the ideal case, the filament shield can be made infinitely thin. However, as an approximation to this, the filament shield may be formed from two pieces of thin plate material. However, this construction has the disadvantage that the shield is not particularly durable and requires a relatively complex fastening device for proper fastening.

Therefore, it is preferable that the filament shield be constructed from a pair of plate-shaped parts that are relatively strong and are preferably made of die-cast material. It is therefore necessary that these plate-like parts have a certain minimum thickness. It is important to minimize the thickness along the inner edge of each plate, the edge closest to the filament in use, to minimize the area of the reflector obscured by the shield. Since the inner edge of each plate hides the reflector from the light generated by the filament, it is possible to configure the outer edge of each plate to have an increased thickness compared to the inner edge. be. The actual thickness of the outer edge is selected to avoid further obscuring the reflector to light directly generated by the filament during use.
This means that a relatively durable shield is obtained.

The actual thickness of the outer edge of each plate is determined by the following factors: the focal length of the upper and lower reflective surfaces, the hole in the reflector, the distance from the filament of the portion of the bulb tube that causes the unwanted reflection, and the position of the bulb relative to the focal point or focal plane of the upper and lower reflective surfaces.

In the structure described above, the upper surface of the plate-like portion of the filament shield is arranged to constitute the upper cut-off of the beam, and this upper surface is non-reflective in order to minimize unwanted reflections. In a preferred embodiment, each top surface is grooved to provide a matte or non-reflective finish.This finish reduces reflections from the surface and the grooves reduce miscellaneous reflections. dissipate. A step may be provided at the inner edge of the top surface, the top surface or "tread" of the step being angled relative to the position of the filament so that the "tread" is shadowed during use.

Preferably, the plate-shaped portion is manufactured by die-casting integrally with the bulb holder attached to the rear hole of the reflector. Such structures are relatively durable;
It is ideally suited to mass production technology.
Such a shield can mask the plane of the parting line of the reflector and reduce the above-described effects of miscellaneous reflections from lacquer beads extending along the plane of the parting line.

In a preferred construction, each plate is configured to provide a support for the shield and is non-reflective;
Prevent light from passing directly outside the aperture of the reflector.
Since such a shield is provided at the front of the filament, it is commonly referred to as an "up-light shield."

The invention also relates to a die-cast product comprising an integral filament shield and lamp holder of the type described above.

The invention will be explained with reference to the drawings.

The lamp reflector 10 shown in FIG.
Upper and lower parabolic sections 11, 12 separated by 3
Equipped with. The focal length of the upper paraboloid section 11 is shorter than the focal length of the lower paraboloid section 12, and the focal point 14 of the upper paraboloid section 11 is on the optical axis of the lamp reflector 10 and behind the filament 15 of the quartz-halogen bulb. It is in. The focal axis of the upper parabolic section 11 is also on the axis of the lamp reflector 10. Lower paraboloid section 12
is longer than the focal length of the upper parabolic section 11, and the focal point 16 of this lower parabolic section 12 is located in front of the filament 15 on the axis of the lamp reflector 10. The focal axis of the lower paraboloid section 12 is inclined downward by 1/2 degree with respect to the horizontal plane. That is, the optical axis of the lamp reflector 10 in the direction shown in FIG. 1 is inclined by 1/2 degree with respect to a certain plane. As shown in FIG. 1, the surface of the dividing line 13 is created by two different paraboloid parts, namely, an upper paraboloid part 11 and a lower paraboloid part 12, which are arranged offset due to the difference in their shapes. ,
In fact, it is formed by the lower surface of the upper paraboloid section 11 protruding inside the lamp reflector 10. Therefore, the surface of the dividing line 13, which is the lower surface of the upper paraboloid section 11, is located toward the lower paraboloid section 12, that is, inside the lamp reflector 10, and faces downward. By configuring the reflecting mirror in this way, the light emitted from the filament 15 and hitting each of the parabolic sections 11 and 12 is deflected downward as shown by _R2 , resulting in the type of light shown by the solid line in FIG. Construct a basic beam pattern that does not pass through a lens. This beam pattern consists of a number of images I of the filament 15. However, in the case of a halogen bulb, the filament 15 is connected to the quartz glass tube 17.
Install inside. A disadvantage of such a construction is that a large number of light reflections occur at the lower constriction 18 of the tube 17. The reflected rays are directed upwardly onto the upper paraboloid at an angle such that the combined reflected rays are directed upwardly. One such light is shown at R ₁ in FIG. This reflected ray R ₁ which is then reflected off the quartz glass tube 17 produces an image I ₁ above the desired cut-off line 19 up to the top of this beam. These images I ₁ are undesirable because they cause undesirable glare. Since the plane of the parting line 13 is inclined, the upper cutoff line 19 is inclined. The beam pattern shown in FIG.
It was caused only by

FIG. 3 shows a structure for preventing the formation of image _I1 .
In the structure shown in FIG. 3, a reflector 10, a filament 1
5 and the quartz glass tube 17 are similar to those in FIG. In FIG. 3, the sloping nature of dividing line 13 is evident. A shield 20 is provided to prevent light reflected from the lower constricted portion 18 of the quartz glass tube 17 from reaching the upper paraboloid portion 11 . This shielding body 20 is divided into two plate-like parts 20a and 20b, which are arranged on both sides of the filament 15 and the quartz glass tube 17. Each plate-shaped portion 20a, 20b is provided with a substantially flat upper surface 21a, 21b, and in this embodiment, these upper surfaces are aligned with respective portions of the surface of the dividing line 13. Therefore, as is clear from FIG.
The axis of the upper surface 21a lies within a horizontal plane. Also, the upper surface 21 is tilted with respect to the horizontal plane.
The axis of the filament 15 lies in the plane b. The angle at which this plane is inclined with respect to the horizontal plane is approximately
It is 15 degrees. The plate-shaped portions 20a and 20b of the shield extend toward the front of the reflector 10, that is, toward the front opening of the reflector 10, and the inner edges 22a and 22 of the shield extend toward the front of the reflector 10, and
b and the respective outer edges 23a, 23b. The outer edges 23a, 23b are thicker than the corresponding inner edges 22a, 22b. A flat lower surface 24a on each plate-shaped portion 20a, 20b of the shield,
24b is provided. Therefore, when viewed from the front side of the reflector, each plate-shaped portion 20a, 20b of the shield has a wedge-shaped cross section. The thickness of each inner edge 22a, 22b is made as thin as possible (in practice, about 0.5 mm is the minimum). Light generated from the center of the filament 15 is transmitted to the lower surface 24a,
The thickness of each outer edge 23a, 23b is determined by the thickness of the inner edge 22a, 22b so that it is not further masked or occluded by 24b. Since the inner edges 22a, 22b have a finite thickness, light is masked to some extent. This is due to the fact that the quartz glass tube 17 is provided around the filament 15 and that the side edges 22a and 22b need to be slightly separated from the quartz glass tube 17 in order to accommodate the tolerances when attaching the halogen bulb to the reflector. Therefore, the side edges 22a, 22b are placed as close as possible to the filament. Plate-shaped portions 20a, 20 of the shield
Factors that determine the precise shape of b will be explained later. However, when the plate-like parts 20a, 20b are made to the correct dimensions, such plate-like parts 20a, 2
The effect of providing 0b is to eliminate the image _I1 of FIG. 2, resulting in a beam pattern of the type shown in FIG. In Figure 4, the relatively sharp cutoff line 1
9, and substantially no image is generated above this line.

In FIG. 5, the lamp device employs the reflector 10 described in connection with FIG. In addition to the reflector 10, there is also a lens element 25 that closes the front part of the reflector 10.
and a die-cast light bulb holder 26 attached to the reflecting mirror 10. The lamp device further includes a rear fitting 27, which is sealed to the rear of the bulb holder 26 by a collar 28 attached to the bulb holder 26, the inwardly curved protrusion of the collar 28 is engaged with the inclined inner surface of the rear metal fitting 27 like a short multi-screw.

In addition to this lamp device, a shield 2 shown in FIG.
0 (in FIG. 5, the plate-shaped portion 20a of the shield
(only shown). However, in this embodiment, the distance between the upper paraboloid section 11 and the lower paraboloid section 12 of the reflecting mirror 10 is such that the dividing line 13 is located between the upper surface and the lower surface of the plate-like sections 20a and 20b of the shielding body. An angled dividing line 13 is placed with respect to the shield 20. The angled parting line 13 is thus masked from the filament of the bulb, and the problem of unwanted reflections from the lacquer beads on the parting line 13 can be prevented. The plate portions 20a, 20b of the shield can be die cast integrally with the bulb holder 26.
In FIG. 6, the inner edges 22a, 22b of the plate-like parts 20a, 20b of the shield are in line with the axial extension of the reflecting mirror and parallel to the axial direction, and the outer edges 23a, 23b are curved in a convex shape. are doing. Upper surfaces 21a, 21b of plate-shaped portions 20a, 20b of the shield
is almost flat, but there are many V-shaped grooves 40a, 4
0b (see especially Figures 7 and 7a). Groove 4
0a, 40b extend substantially parallel to the longitudinal axis of the filament 15, and grooves are formed over the entire area of the upper surfaces 21a, 21b, except for the inner edge portion where the plurality of steps 41a, 41b are provided. 40
a and 40b are provided. The steps 41a and 41b are grooves 40
a, parallel to 40b. The upwardly directed portions or treads 42a, 42b are tilted relative to the position of the filament 15 so that these treads are in shadow;
Reduces light scattering here. Upper surface 21a, 2
The entire part 1b is given a dark matte or non-reflective finish, for example by applying matte black paint. The plate-like portions 20a, 20b of the shield are further provided with respective raised portions 29a, 29b to ensure that the front shield 30 can be mounted securely. Groove 40
A ridge 2 on the upper surface 21a, 21b in the area of the joint between a, 40b and the respective step 41a, 41b.
9a and 29b are provided. Each raised portion 29a, 29b
The outer edges of the bulb holder 26 are slanted toward each other so that the outer edges flare outwardly toward the bulb holder 26.
Between the ends of each side edge, each raised portion 29a, 29b is provided with an outwardly projecting raised abutment portion 35a, 35b. A recess (not shown) is provided in the upper edge of each slot 36. The front shield 30 is attached to the plate portions 20a, 20b by forcing the shield portions 20a, 20b into their respective slots 36. The sides of the shield 30 are engaged with the enlarged outer edges of the raised portions 29a, 29b, thereby forcing the sides of the shield 30 apart. When the shield 30 assumes the correct axial position, the ridges 35a, 35b are recessed in the upper edge of the slot 36, causing further axial movement of the filament relative to the plate-shaped portions 20a, 20b of the shield. to prevent Lateral movement of the shield 30 can be prevented since the sides of the shield engage the outer edges of the ridges 29a, 29b. The widening of the outer edges of the ridges provides a vibration-free installation, since the mutually parallel sides of the shield 30 are stressed outwardly. The front shield prevents light originating directly from the filament from exiting the lamp arrangement without being reflected from one of the parabolic sections 11, 12 of the reflector. Although not shown in FIGS. 5-8, methods of attaching the quartz glass tube to the bulb holder 26 are known to those skilled in the art. Therefore, when attaching a halogen bulb to the bulb holder 26, attach this filament as described with reference to FIG. Attach against. Therefore, in this embodiment, the filament is mounted so that its axis is slightly above the dividing line 13, which is located below the axis of the reflecting mirror 10. The beam projected by the lamp arrangement of FIGS. 5-8 without lens element 25 is the same as that shown in FIG. The same is true if we take into account the beading of the lacquer in the area of the parting line 13.

In the above embodiment, the axis of the filament is 0.5 mm above the optical axis of the reflector, and the upper surfaces 21a and 21b of the plate-like parts 20a and 20b of the shield intersect with the optical axis of the upper parabolic part 11 of the reflector. lies within the plane. Furthermore, the bulb holder 26 and the shield 20 can be rotated within the reflector 10 so that the beam pattern shown is for use in countries where vehicles are driven on the left side of the road. to obtain the necessary cut-off beam for use on the road on which it is driven.

A method for determining the shape of each plate-like portion 20a, 20b of the shield will be explained with reference to FIGS. 9-12. 1st
Figure 2 shows Figure 9 in detail, and parts that are not visible in Figure 9 are shown with dotted lines in Figure 12.
Geometric right angle symbols have been used to make it easier to understand the various angles. Although the left edge portion of the figure is shown as a line segment in FIG. 12, it is shown as a long rectangle with a narrow width in FIG. The actual shape is wedge-shaped.
Although Figure 9 is correct, the figure in Figure 12 was used to make it easier to understand the relationship between angles. FIG. 10 is a side view of FIG. 9. There is no direct relationship between FIG. 10 and FIG. 11. Figure 11 shows the upper paraboloid section 1.
FIG. 1 is a diagrammatic plan view of a portion of FIG. 1, which also shows the angle and size of a ray of light from the filament 15 that is incident on the upper paraboloid at point P. In FIGS. 9 to 12, one plate-shaped portion 20a of the shield is selected for illustration.

As mentioned above, in consideration of the presence of the quartz glass tube 17 and tolerance requirements, the plate-shaped portion 20a of the shield
It is necessary that the inner edge 22a of the filament 15 be located as closely as possible to the filament 15. The distance of the inner edge 22a from the filament 15 is indicated by b in FIG. The distance from the centerline of the filament 15 to the outer diameter 18 of the tube 17 is indicated by B in FIG. As mentioned above, the thickness of the inner edge 22a is the minimum value possible for accurate die casting, and b ₁
is given by Typically this dimension is 0.5mm.

It is assumed that there is a point P on the surface of the upper parabolic portion 11 of the reflecting mirror at a distance Z from a vertical plane passing through the center line of the filament 15. If a straight line is drawn from point P to point 18, and then a line is drawn from the center line of filament 15 through L (lowest limit of side edge 22a), the intersection of these two lines will be at this cross section of upper paraboloid section 11. The depth of the plate-like portion 20a of the shield is given. Point P is the lowest point on the selected vertical section of the upper parabolic portion 11 of the reflector, and this lowest point produces the amount of reflection that needs to be masked.

This led to the development of the wedge shape (see Figure 9). The cross section passing through this wedge is also considered for other points on the reflecting mirror, and the angle θ in FIG. 10 becomes a composite angle θ ₁ consisting of α and θ from FIG. θ ₁ =
θcosα.

The reason why the composite angle θ ₁ is equal to θcosα is the first
This is clear from Figure 2. Although it is different from the actual one, the 12th
In the figure, the apex of the wedge shape is approximately considered to be a straight line with no width.

cosα=OA/OC, tanθ=AB/OA, tanθ ₁ =
CD/OC ∴OC=CD/tanθ ₁ and OA=AB/tanθ Therefore, cosα=AB/tanθ・tanθ ₁ /CD However, since AB=CD, cosα=tanθ ₁ /tanθ ∴tanθ ₁ = tanθcos
α Now θ and θ ₁ are both small angles, so
tanθ ₁ ≒θ ₁ , tanθ≒θ θ ₁ = θcosα
becomes.

Using the above explanation, A in FIG. 10 can be found for the various hole distances y in FIG. 11. Therefore, tanβ=B/Z, β=tan ^-1 B/Z h ₂ =Atanθ h ₂ = (Z-A)tanβ ∴Atanθ=(Z-A)tanβ tanθ/tanβ+1=Z/A (In the diameter (Latus Rectum)) For other points on the upper paraboloid part 11 From Figure 11, Z=√ ² + (-) ^2Here , y ² =4ax, x=y ² /4a Therefore, let y and α be variables, and here θ ₁ = θcosα
from Therefore, cosα=y/Z, α=cos ^-1 y/Z In the equations of A for y, a, θ, α, and β above, y, a, θ, α, and β are the conic curves chosen as reflectors. This value is determined by the parameters and the dimensions of the glass tube 17 containing the filament 15.
Since the position of the filament 15 with respect to the reflecting mirror is known and the shape of the reflecting mirror is also known, y, a,
θ, α and β are easily determined, so A can be determined as any point on the reflector. A
Once determined, the shape of the curve of the outer edge of the shield can be determined by drawing a line between a number of points A determined with respect to different points P on the surface of the reflector.

If you analyze it, this curve approximates a circular arc, so
The outer edges 23a, 23b can be accurately curved as shown in FIG.

In the embodiments described above, upper and lower paraboloids are used, and the focal points of these paraboloids are not coincident and the focal axes are also tilted relative to each other. However, the present invention can also be applied to the case of reflecting mirrors whose focal points coincide, whose focal axes coincide, or whose focal points and focal axes coincide. Furthermore, although the above embodiments have been explained using the parabolic equation y ² =4ax, the same effect can be obtained by using the elliptic equation instead, and therefore, the present invention is not a parabolic mirror, but an elliptic mirror or its like. It can also be applied to value-shaped reflectors.

Further, in the above-described embodiment, the surface of the dividing line 13 is constituted by the lower surface of the upper paraboloid section 11, and is located inside the reflecting mirror 10 and faces downward. Although this is a preferred structure, it is also possible to have a structure in which the surface of this dividing line 13 faces upward. In this way, when the surface of the dividing line 13 faces upward, the shield 20
By providing this, the surface of this upwardly directed parting line can be at least to some extent masked, and undesired reflections from this step can also be prevented.

Preferably, the shield 20 and bulb holder 26 are die cast together from zinc, thus ensuring satisfactory operation at the operating temperatures of the headlamp.

Although the provision of the filament shield 20 described above reduces the angular range over which light is concentrated on the reflector 10, this reduction is slight and can be considered from the loss of light output due to the benefit of improved cut-off control. The problem can be significantly resolved. Moreover, for example, by increasing the depth of the reflector,
It is possible to recover this loss of light power by choosing a reflector with different parameters by shortening the focal length.

Instead of using a die-cast shield part, it is also possible to use a metal plate shield part.
In that case, it is preferable to provide the picture shield with a flat metal plate portion corresponding to the upper surface 21a or 21b and an integrated downwardly curved metal plate portion corresponding to the outer edge 23a or 23b. This downwardly curved metal plate portion serves to prevent and strengthen the flat metal plate portion from deformation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a vehicle headlamp showing various reflection effects from a halogen bulb tube, FIG. 2 is a diagrammatic view of the upper part of the beam irradiated by the headlamp of FIG. 1, and FIG. A diagrammatic front view of an embodiment of the headlamp according to the invention, FIG. 4 diagrammatically showing the upper part of the beam emitted by the headlamp of FIG. 3, and FIG. 6 is a sectional view perpendicular to FIG. 5 showing the filament shield forming portion of the headlamp shown in FIG. 5; FIG. 7 is a front view of the shield shown in FIG. 6; FIG. 7a 7 is an enlarged view of a part of the shield shown in FIG. 7, FIG. 8 is a sectional view perpendicular to FIG. 5 showing the headlamp shown in FIG. 5, and FIGS. FIG. 2 is an explanatory diagram of dimensions to be considered when determining a suitable shape of a filament shield used in the present invention. 10...Lamp reflecting mirror, 11...Upper paraboloid part, 1
2... Lower paraboloid part, 13... Parting line, 14, 16...
Focal point, 15... Filament, 17... Quartz glass tube, 18... Lower constriction part, 19... Cutoff line, 20... Shielding body, 20a, 20b... Plate-shaped portion,
21a, 21b...Top surface, 22a, 22b...Inner edge, 23a, 23b...Outer edge, 24a, 24b
... lower surface, 25 ... lens element, 26 ... light bulb holder,
27... Rear metal fittings, 28... Collar, 29a, 29b
...Protuberance, 30...Front shield, 35a, 35b...
Raised abutting portion, 36...Slot hole, 40a, 40b...V-shaped groove, 41a, 41b...Step, 42a, 42b...Tread.

Claims (1)

[Scope of Claims] 1. A reflector having arm-shaped upper reflective surface portions 11 and lower reflective surface portions 12 having different focal lengths, respectively, wherein focal points 14 and 16 of the upper reflective surface portion and the lower reflective surface portion are mutually aligned. A dividing line 13 is formed between the upper reflective surface portion and the lower reflective surface portion by shifting the upper reflective surface portion and the lower reflective surface portion in the axial direction of the reflecting mirror so as to match or be adjacent to each other;
A vehicle headlamp comprising a lamp filament 15 disposed at or adjacent to the focal points 14 and 16 and a filament shield 20, wherein the lamp filament 15 and the focal point 1
The filament shield 20 is provided with a pair of plate-shaped portions disposed on both sides of the lamp filament 15 so that the light rays emitted from the lamp filament 15 pass through the dividing line 13.
each of the plate-shaped portions extending in front of the headlamp in substantially the axial direction of the reflector so as to be substantially in line with the dividing line 13 between the upper reflective surface portion and the lower reflective surface portion, The filament shield 20 is configured to be non-reflective, and the outer edges 23a, 23b of each of the plate-shaped portions 20a, 20b are configured to be thicker than the inner edges, but the outer edges 23a, 23b of each of the plate-like portions 20a, 20b are thicker than the inner edges. A headlamp for a vehicle, characterized in that the angle formed by the end edge is not larger than the angle formed by the inner end edge at the lamp filament. 2. Each of the plate-shaped portions of the filament shield is formed of a thin metal plate, and the outer edge of the metal plate is bent out of the plane of the metal plate to reinforce the metal plate so that it does not bend. A vehicle headlamp according to claim 1, further comprising an outer edge. 3. The vehicle headlamp according to claim 1, wherein each of the plate-shaped portions is a die-cast product. 4. A headlamp for a vehicle according to any one of claims 1 to 3, wherein a groove is provided on at least a portion of the upper surface of each of the plate-like portions, and a dark mat is provided on at least a portion of the upper surface to give a non-reflective finish. 5. A step is provided on at least a portion of the upper surface of each of the plate-shaped parts, and the upper surface or tread of the step is angled with respect to the position of the filament so that the upper surface is in a shadow during use. 4. The vehicle headlamp according to any one of items 4 to 4. 6. The vehicle headlamp according to any one of claims 1 or 3 to 5, wherein the plate-shaped portion is made of die-casting and is integrally formed with a light bulb holder attached to a hole at the rear of the reflector. 7. The vehicle headlamp according to any one of claims 1 to 6, wherein each of the plate-like portions is provided with a raised portion to support the front shield of the filament.