JP3391203B2 - Headlight reflector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light flux emitted from a light source bulb of a headlight such as an automobile headlamp or fog lamp and reflected by a complex reflection surface of a reflector.
The present invention relates to a reflector for a headlight improved so as to obtain a substantially desired light distribution pattern that is diffused right and left without being dimmed by a lens, and particularly, a molding distortion of the reflector and / or a mounting position of a light source bulb ( The present invention relates to a reflector for a headlight, which can easily determine a filament setting position).

[0002]

2. Description of the Related Art The basic structure of a conventional headlight is a paraboloid of revolution (or ellipsoid of revolution, or a complex surface of paraboloid (deformed paraboloid) and ellipsoid). The light emitted from the light source valve arranged near the focal point of the reflector is reflected by the above-mentioned rotary parabolic reflector in a direction parallel to the optical axis (rotational axis of the paraboloid of revolution), and this reflected light flux is left and right by the front lens It has been designed to obtain a desired light distribution pattern by appropriately adjusting light such as by diffusing light in a direction. Recently, the reflector has not been constructed in the shape of a simple paraboloid of revolution, but the paraboloid of revolution is used as a reference shape, and the reflecting surface is designed by dividing it into multiple parts (multiple parts), and each part is focused. A technique for forming a composite reflecting surface by slightly changing the distance or slightly tilting the optical axis direction has been studied. The reflected light flux of a reflector (so-called multi-reflector) having such a composite reflection surface is
Since the desired light distribution pattern is obtained without dimming through the lens, the optical function as a headlight can be achieved even if the light is projected to the front of the lamp through the transparent lens. However, even when using a reflector composed of a compound reflection surface as described above, there is an example in which a prism is provided in a portion (dummy portion) where the projected light flux does not pass in order to adjust the appearance of the lens, and the projected light flux passes through. There is also an example in which a prism for correcting a light distribution pattern is provided in a portion to be covered. In the present specification, a transparent lens refers to a lens in which a portion through which a projected light beam passes is transparent or nearly transparent.

The above-mentioned reflector for a headlight is made of a heat-resistant synthetic resin and has a reflecting surface such as aluminum vapor deposition on its surface, so that the reflector may be distorted due to molding or the like. Further, the mounting position of the light source bulb (the setting position of the filament) may be displaced. In this case, the accuracy of the light distribution pattern of the irradiation light may decrease.

In the above-described headlight reflector, particularly for vehicles such as automobiles, the accuracy of the light distribution pattern of the irradiation light is required to be relatively high. Therefore,
One reflector for judgment is arbitrarily extracted from the mass-produced reflectors, and in this reflector for judgment,
The presence or absence of molding distortion is determined, and it is also determined whether the light source bulb is attached to the reflector at the proper position (whether or not the filament is set at the proper position).

[0005]

However, since the above-described conventional reflector for a headlight is composed of a compound reflecting surface having an optical axis, the molding distortion of the reflector and / or the mounting position of the light source bulb (the setting position of the filament). ) Is more difficult than a reflector having a single reflecting surface with a single optical axis.

It is an object of the present invention to provide a headlight reflector which can easily determine the molding distortion of the reflector and / or the mounting position of the light source bulb (set position of the filament).

[0007]

In order to achieve the above-mentioned object, the present invention is characterized in that a plurality of reflecting surface segments for judging a reflector are provided on a composite reflecting surface of a reflector for a headlight. And

As a result, the present invention compares the light distribution pattern obtained from a plurality of reflector-determining reflecting surface segments with a reference light distribution pattern obtained in advance by designing, calculation, etc. The molding distortion and / or the mounting position of the light source bulb (the setting position of the filament) can be easily determined.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, three examples of embodiments of a headlight reflector of the present invention will be described with reference to the accompanying drawings. 1 to 10 show a first embodiment of a headlight reflector of the present invention. This example describes a reflector-movable headlamp. The illustrated headlamp is mounted on the right side of the vehicle (the right side when viewed from the driver's side and the left side when viewed from the front of the vehicle). Also,
The headlamp mounted on the left side of the automobile is substantially symmetrical with the headlamp shown in the figure.

In the present specification and the drawings, reference numeral "L"
Indicates the left side when looking forward from the driver side, the code “R” indicates the right side when looking forward from the driver side, and the code “U” further looks forward from the driver side. The upper side of the case is shown, and the symbol "D" also shows the lower side when the front side is seen from the driver side. Further, the symbol “HH” indicates a horizontal line (horizontal axis), and the symbol “VV” indicates a vertical line (vertical axis). In the drawings, hatching is omitted for the sake of understanding the drawings.

The headlamp shown in FIG. 1 has a lamp chamber 1 defined by a lamp housing 1 and a lens 2 as shown in FIG. The reflector 4 of the present invention is disposed in the lamp chamber 3 so as to be vertically and horizontally rotatable via a pivot mechanism and an optical axis adjusting device (not shown). A composite reflection surface is provided on the front surface side (the surface side facing the lens 2) of the reflector 4. The composite reflecting surface is composed of a plurality of reflecting surface segments 40 which are divided into upper, lower, left and right sections.

This composite reflecting surface does not have a single focal point in the strict sense, but the difference in focal length between the plurality of paraboloids of revolution forming the composite reflecting surface is small. , The focus F shown in the figure is a quasi-focus, although it is a strict focus, since it shares almost the same focus, but this is called the focus F in this specification. Similarly, the optical axis Z-Z shown in the figure is also a pseudo optical axis in a strict sense, but in the present specification, this will be referred to as an optical axis.

As shown in FIGS. 1 to 3, the above-described reflector 4 has horizontal walls 43 above and below the reference paraboloid of revolution.
Are integrally provided, and when viewed from the front, as shown in FIG. In the above-described reflector 4, distortion due to molding at the time of molding, distortion due to heat treatment in a later step, and the like tend to occur.

A light source bulb 5 is detachably attached to the reflector 4 in the lamp chamber 3 via a bulb holder 50 or the like. Filament 51 of this light source bulb 5
Is located at the focal point F of the above-mentioned composite reflecting surface. The filament 51 of the light source bulb 5 has a cylindrical shape along the optical axis Z-Z.

Rubber covers 6 are attached between the rear opening of the lamp housing 1 and the light source bulb 5, respectively. When the above-mentioned light source bulb 5 is turned on, the light flux from the filament 51 of the light source bulb 5 is diffused left and right by the composite reflection surface (reflection surface segment 40) of the reflector 4, and the reflected light diffused left and right. Is projected to the front of the lamp with a desired light distribution pattern diffused right and left through the lens 2.

In the reflector 4 for a headlight of the present invention, the composite reflecting surface (reflecting surface segment 40) is provided with a plurality of reflecting surface segments 41 for judging a reflector. As shown in FIGS. 2 and 5, two reflective surface segments 41 for determining the reflector are provided symmetrically with respect to the light source bulb 5, one in total.

Further, as shown in FIGS. 2 and 5, the two bilaterally symmetrical reflector surface segments 41 for judging a reflector have a substantially oblong rectangular shape when viewed from the front.

Further, as shown in FIGS. 5 to 7, the two left-right symmetric reflector surface-reflecting reflecting surface segments 41 are, as shown in FIGS. 5 to 7, the left and right reflector-surface reflecting surface segments from the vertical axis VV of the reflector 4. When the dimension of the reflector 41 up to the center is a, the dimension from the horizontal axis H-H of the reflector 4 to the center of the upper reflecting surface segment 41 for reflector determination is b, and the focal length of the reflector 4 is f, It is arranged at a = 2 × f and almost b = 30.

Further, as shown in FIG. 4, the two bilaterally symmetrical reflecting surface segments 41 for judging a reflector form a paraboloid of revolution about an optical axis ZZ.

The headlamp reflector 4 according to the present invention in this embodiment has the above-mentioned structure, and its determination operation will be described below. First, one reflector 4 for determination is arbitrarily extracted from the mass-produced reflectors 4. The rate of extracting the reflector 4 for this determination is appropriately determined for each production line of the reflector 4. Next, the reflector 4 for this determination is attached to a jig (for example, the light source bulb 5).
The light L1 from the filament 51 is reflected by the two reflecting surface segments 41 for reflector determination, and the reflected light L2 is projected on the screen as the light distribution pattern shown in FIGS. 8 to 10) Set to. In addition, in order to obtain the light distribution patterns of FIGS. 8 to 10, means other than the above jig may be used.

Then, when the light source bulb 5 is turned on, as shown in FIG. 4, the light L1 from the filament 51 of the light source bulb 5 is reflected by the two reflecting surface segments 41 for reflector determination, and the reflected light L2 is obtained. The light is irradiated forward substantially parallel to the optical axis Z-Z, and the screen in front of FIG.
Two light distribution patterns shown in are projected.

If there is no molding distortion of the reflector 4 and there is no displacement of the mounting position of the light source bulb 5 (set position of the filament 51), the light distribution pattern of FIG. 8, that is, it is obtained by design and calculation in advance. The reference light distribution pattern is symmetrical with respect to the vertical line (vertical axis) VU-VD, and the degree of overlap of the end portion on the center side is appropriate (this appropriate degree of overlap is determined by design and calculation). Two light distribution patterns are obtained.

On the other hand, when the reflector 4 has a molding distortion, the light distribution pattern shown in FIG. 9, that is, two light distribution patterns which are not vertically symmetrical with respect to the vertical line (vertical axis) VU-VD are deviated vertically. can get.

When the mounting position of the light source bulb 5 (the setting position of the filament 51) is deviated, it is symmetrical with respect to the vertical line (vertical axis) VU-VD. Two light distribution patterns in which is not appropriate are obtained. For example, when the filament 51 is set behind the focus F (on the side of the reflector 4 and the side opposite to the lens 2), the light distribution pattern of FIG. 10, that is, the vertical line (vertical axis) VU-VD, is set. Although it is symmetrical, the horizontal line (horizontal axis) HL-HR opened to the left and right 2
An individual light distribution pattern is obtained. The filament 51
Is set to be displaced forward of the focal point F, two light distribution patterns closed to the left and right in the horizontal line (horizontal axis) HL-HR direction are obtained.

As described above, the reflector 4 for a headlight according to the present invention in this embodiment is provided with the two reflecting surface segments 41 for judging the reflector on the composite reflecting surface (the reflecting surface segment 40). By comparing a light distribution pattern obtained from the two reflecting surface segments 41 for judging a reflector with a reference light distribution pattern obtained by design and calculation in advance, the molding distortion of the reflector 4 and / or the light source bulb are compared. 5 mounting position (filament 51
It is possible to easily determine the (set position of).

In particular, in this embodiment, two reflecting surface segments 41 for reflector determination are provided symmetrically with respect to the light source bulb 5 one by one, so that a total of two reflecting surface segments 41 are provided on the screen as described above. The molding distortion of the reflector 4 depends on whether or not the two light distribution patterns are symmetrical, and the mounting position of the light source bulb 5 (set position of the filament 51) depends on the overlapping degree of the two light distribution patterns on the screen. , Each can be determined very easily. Moreover, it is most suitable for determining the molding strain of the above-described laterally elongated substantially rectangular reflector 4 in which the horizontal walls 43 are integrally provided on the upper and lower sides.

Further, in this embodiment, two bilaterally symmetrical reflecting surface segments 41 for reflector determination are
Since it has a horizontally long rectangular shape, when the light L1 from the filament 51 of the light source bulb 5 is reflected by the reflecting surface segment 41 for reflector determination and is radiated forward as reflected light L2, the optical axis Z of this filament 51 is used. The cylindrical shape along the −Z direction and the horizontally long rectangular shape of the reflecting surface segment 41 for reflector determination substantially match. As a result, the two light distribution patterns on the screen have a rectangular shape as shown in FIGS. 8 to 10. Therefore, the molding distortion of the reflector 4 and / or the mounting position of the light source bulb 5 (of the filament 51) is visually observed. It is most suitable for determining the (set position).

Further, in this embodiment, two symmetrically symmetric reflecting surface segments 41 for reflector determination are used.
Is arranged at a position of approximately a = 2 × f.
, The parabolic formula y = x ² / 4f
= 2 × f, the two symmetrical reflective surface segments 41 for reflector determination are located at the focal point F, that is, almost right beside the filament 51. As a result, the cylindrical filament 51 along the optical axis Z-Z
Is projected on the screen in a state close to the actual shape via the two horizontally long rectangular symmetrical reflecting surface segments 41 for reflector determination, so that the molding distortion of the reflector 4 and / or the light source bulb 5 is Mounting position (filament 5
This is most suitable for making a more accurate determination of (1 set position).

Furthermore, in this embodiment, two symmetrical reflecting surface segments 4 for reflector determination are used.
Since No. 1 is arranged at a position of approximately b = 30 above the horizontal axis H-H, two symmetrical reflecting surface segments 41 for reflector determination are located at the focal point F, that is, right beside the filament 51. It will be located about 30 mm above. As a result, the two light distribution patterns on the screen are symmetrical as shown in FIGS. 8 to 10, in which the end on the center side is inclined downward and the end on the outer side is inclined upward. Since the shapes of the overlapping portions of the end portions of the light source bulb change depending on the overlapping degree, the overlapping degree of the end portions on the center side, that is, the mounting position of the light source bulb 5 (filament 5
It is most suitable for determining the set position (1). It should be noted that the two bilaterally symmetrical reflector surface segments 41 for reflector determination may be arranged at a position of approximately b = 30 below the horizontal axis H-H. In this case, the two light distribution patterns on the screen are bilaterally symmetrical, with the central end being upward and the outer end being downward, contrary to the patterns shown in FIGS. Similar to the one shown in the figure, it is most suitable for determining the mounting position of the light source bulb 5 (set position of the filament 51).

Furthermore, in this embodiment, two bilaterally symmetrical reflector surface segments 4 for reflector determination are used.
Since 1 forms a paraboloid of revolution about the optical axis ZZ, the light L1 from the filament 51 can be reflected forward as reflected light L2 that is substantially parallel to the optical axis ZZ. As a result, since two light distribution patterns having clear contours are obtained on the screen, it is possible to more accurately determine the molding distortion of the reflector 4 and / or the mounting position (setting position of the filament 51) of the light source bulb 5. Optimal. Figure 1
1 and 12 show a second embodiment of a headlight reflector of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 10 indicate the same components. In the reflector for a headlight of the present invention in the second embodiment, as shown in FIG. 11, two left and right symmetrical reflecting surface segments 41 for judging a reflector are b.
Since it is arranged at the position of = 0, the two symmetrical reflective surface segments 41 for reflector determination are located at the focal point F, that is, right next to the filament 51.
As a result, the two light distribution patterns on the screen are shown in FIG.
As shown in FIG. 2, it is arranged horizontally on the horizontal axis H-H, and is vertically symmetrical with respect to the horizontal axis H-H and on the vertical axis V-H.
Since it is bilaterally symmetric with respect to −V, it is optimal for judging the molding distortion of the reflector 4 which is judged by whether or not the two light distribution patterns on the screen are bilaterally symmetric. Note that, also in this embodiment, the shape in which the ends on the center side of the two light distribution patterns on the screen overlap each other is a quadrangular shape and changes depending on the degree of overlap. Therefore, the degree of overlap is determined. It is also possible to determine the mounting position of the light source bulb 5 (set position of the filament 51).

13 to 16 show a third embodiment of the headlight reflector of the present invention. 1 to 1 in the drawings
The same symbols as 0 indicate the same. As shown in FIG. 13, the reflecting surface segment 42 for reflector determination of the reflector for a headlight of the present invention in the third embodiment has a convex curved surface shape in the horizontal cross-sectional shape.

Since the reflecting surface segment 42 for reflector determination in the third embodiment has the above-described shape, the light L1 from the filament 51 is reflected by the reflecting surface segment 42 for reflector determination. The light L3 is diffused right and left as shown in FIG. As shown in FIGS. 14 to 16, the light distribution pattern of the diffuse reflected light L3 is diffused to the right and left so that there is no hindrance to the determination, so that there is no discomfort in light distribution.

In the third embodiment, if there is no molding distortion of the reflector 4 and there is no displacement of the mounting position of the light source bulb 5 (position where the filament 51 is set),
FIG. 14, that is, a reference light distribution pattern obtained in advance by designing, calculation, etc., and showing a vertical line (vertical axis) V
It is possible to obtain two light distribution patterns that are bilaterally symmetric with respect to the U-VD and that have an appropriate degree of overlap of the ends on the center side.

On the other hand, when the reflector 4 has a molding distortion, the light distribution pattern of FIG. 15, that is, two light distribution patterns which are not symmetrical with respect to the vertical line (vertical axis) VU-VD, which are biased upward and downward, are generated. can get.

If the mounting position of the light source bulb 5 (the setting position of the filament 51) is deviated, it is symmetrical with respect to the vertical line (vertical axis) VU-VD. Two light distribution patterns in which is not appropriate are obtained. For example, when the filament 51 is set rearward of the focal point F (on the side of the reflector 4 and the side opposite to the lens 2), the light distribution pattern of FIG. 16, that is, the vertical line (vertical axis) VU-VD, is set. Although it is symmetrical, the horizontal line (horizontal axis) HL-HR opened to the left and right 2
An individual light distribution pattern is obtained. The filament 51
Is set to be displaced forward of the focal point F, two light distribution patterns closed to the left and right in the horizontal line (horizontal axis) HL-HR direction are obtained.

As described above, the third embodiment can achieve the same operational effect as that of the first embodiment.

In the above-described embodiment, the reflective surface segments 41 and 42 for reflector determination are provided symmetrically one by one, two in total, but not three symmetrically and three or more are provided. May be. Further, in the above-described embodiment, the reflecting surface segment 41 for reflector determination,
42 has a horizontally long rectangular shape, but may have another shape.

Further, in the above-described embodiment, the reflecting surface segments 41 and 42 for reflector determination are substantially a.
= 2 × f, 0 ≦ b ≦ 30, but they may be arranged at other positions. For example, the reflecting surface segments 41 and 42 for reflector determination may be arranged so as to be shifted forward and backward with respect to the focal point F, and the size of the light distribution pattern on the screen may be appropriately changed to such an extent that the determination is not hindered. Moreover, when used in combination with the reflecting surface segment 42 for reflector determination (having a convex curved surface shape in the horizontal cross-sectional shape) of the third embodiment described above, there is no hindrance to the determination of the size of the light distribution pattern on the screen. It can be appropriately changed over a wider range.

Furthermore, in the above-mentioned embodiment,
The reflective surface segments 41, 42 for reflector determination are paraboloids of revolution about the optical axis ZZ, and have a convex curved surface shape in the horizontal sectional shape, but may be surfaces of other shapes. good.

Although the above-described embodiment has described the headlamp of the movable reflector type, the reflector for a headlamp of the present invention is a headlamp for other automobiles, for example, a unit movable type headlamp. , Fog lamps, or headlights for traveling among four-lamp headlamps (so-called unit type 1) and headlamps for passing (so-called unit type 2), headlights for other vehicles, and other headlights It can also be used as a light.

Further, in the above-mentioned embodiment, the example in which the light source bulb 5 having the cylindrical shape of the filament 51 along the optical axis ZZ is used is explained, but the light source bulb of the filament having other shape is used. You may.

[0042]

As is apparent from the above, since the reflector for a headlight of the present invention is provided with a plurality of reflecting surface segments for judging a reflector on the composite reflecting surface, a plurality of reflecting surface segments are provided. By comparing the light distribution pattern obtained from the reflective surface segment for reflector determination with the reference light distribution pattern obtained in advance by design and calculation, the molding distortion of the reflector and / or the mounting position of the light source bulb (filament setting The position) can be easily determined.

[Brief description of drawings]

FIG. 1 shows a first embodiment of a headlamp reflector of the present invention, and is a vertical cross-sectional view of a headlamp equipped with the headlamp reflector of the present invention.

FIG. 2 is a front view of a headlight reflector of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2, showing a state in which a light source bulb is set.

4 is a schematic cross-sectional view taken along the line IV-IV in FIG. 2 and is an explanatory cross-sectional view showing an optical path of reflected light in a reflecting surface segment for reflector determination.

FIG. 5 is an explanatory front view showing an arrangement position and a shape of a reflective surface segment for reflector determination.

FIG. 6 is a transverse cross-sectional view for explanation.

FIG. 7 is also a vertical cross-sectional view for explanation.

FIG. 8 is a diagram of a light distribution pattern when there is no molding distortion of the reflector and there is no displacement of the light source bulb mounting position (filament setting position).

FIG. 9 is a diagram of a light distribution pattern when the reflector has molding distortion.

FIG. 10 is a diagram of a light distribution pattern when the light source bulb is attached to be displaced from a regular position and the filament is set to be displaced from the focal point rearward.

FIG. 11 is a front view for explaining the second embodiment of the reflector for a headlight of the present invention and showing the arrangement position and shape of the reflecting surface segment for reflector determination.

FIG. 12 is a diagram of a light distribution pattern when there is no molding distortion of the reflector and there is no displacement of the light source bulb mounting position (filament setting position).

FIG. 13 is an explanatory cross-sectional view showing a third embodiment of a headlight reflector of the present invention and showing an optical path of reflected light at a reflector surface segment for reflector determination corresponding to FIG. 4.

FIG. 14 is a diagram of a light distribution pattern when there is no molding distortion of the reflector and there is no displacement of the light source bulb attachment position (filament setting position).

FIG. 15 is a diagram of a light distribution pattern when the reflector has molding distortion.

FIG. 16 is a diagram of a light distribution pattern when the light source bulb is attached to be displaced from a regular position and the filament is set to be displaced to the rear of the focus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lamp housing, 2 ... Lens, 3 ... Lamp room, 4 ... Headlight reflector, 40 ... Each reflective surface segment, 41,
42 ... Reflective surface segment for reflector determination, 43 ... Horizontal wall, 5 ... Light source bulb, 51 ... Filament, F ... Focus, ZZ ... Optical axis, HH ... Horizontal line (horizontal axis), VV
... vertical line (vertical axis).

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI G01M 11/06 G01B 11/24 A // F21W 101: 10 F21Y 101: 00 (58) Fields investigated (Int.Cl. ⁷ , DB name) F21S 8/10 F21V 7/00 F21V 7/09 F21V 17/00 G01B 11/24 G01M 11/06

Claims (6)

(57) [Claims] 1. A reflector for a headlight, wherein a light flux emitted from a light source bulb is reflected by a composite reflection surface and projected in front of a lamp, wherein the composite reflection surface has a plurality of reflection surface segments for reflector determination. A reflector for a headlight, which is characterized in that it is provided. 2. The reflector for a headlight according to claim 1, wherein two reflector surface segments for determining the reflector are provided symmetrically with respect to the light source bulb. . 3. The headlight reflector according to claim 2, wherein the two left-right symmetrical reflecting surface segments for determining a reflector have a horizontally long substantially rectangular shape. 4. The two left / right symmetrical reflecting surface segments for determining a reflector have a dimension a from the vertical axis of the reflector to approximately the center of the left and right reflecting surface segments, and reflectivity above or below the horizontal axis of the reflector. Assuming that the dimension of the surface segment up to the center is b and the focal length of the reflector is f, within the vicinity of the area around a = 2 × f,
It is arrange | positioned in the position of 0 <= b <= 30, The reflector for headlights of Claim 2 or 3 characterized by the above-mentioned. 5. The headlight according to claim 1, wherein the reflecting surface segment for reflector determination is a paraboloid of revolution having an optical axis as a rotation axis. Reflector. 6. The reflector for a headlight according to claim 1, wherein the reflecting surface segment for reflector determination has a convex curved surface shape in a horizontal cross-sectional shape.