JPH0465003A - Projection type headlamp for automobile - Google Patents

Abstract

PURPOSE:To apply a reflector to both a right light distribution lamp and a left light distribution lamp by fixedly arranging the reflector offcenter to the right or left horizontally from the center of a lens according to right light distribution or left light distribution. CONSTITUTION:A reflector 31 is arranged offcenter to the left horizontally from the center of a lens 36 on the front view for a left light distribution lamp (the lens 36 is set to the right horizontally against the reflector 31), and the reflector 31 is arranged offcenter to the right horizontally from the center of the lens 36 on the front view for a right light distribution lamp (the lens 36 is set to the left horizontally against the reflector 31). The preset right light distribution or left light distribution is obtained, and the right light distribution and left light distribution can be selected by changing the fitting position of the reflector 31 with a single shape to a lens holder 37. This reflector 31 can be applied to both right light distribution and left light distribution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a headlamp for automobiles, motorcycles, and mopeds (hereinafter collectively referred to as automobiles), and particularly relates to a headlamp that reflects light from a light source with a reflector. The present invention relates to a projection type automotive headlamp that projects images using a projection lens.

[Prior Art and Problems to be Solved by the Invention] This type of headlamp, as shown in FIG. A reflector 3 containing a bulb 2 and a lens holder 5 holding a projection lens 4 are assembled to form a projection unit 1. A shade 6 for forming a clear cut is provided inside the lens holder 5.

Also, whether to drive on the right or left side of the road is determined by the road traffic law of each country, and the light distribution pattern of the lamp is automatically determined depending on whether you drive on the left or right side. Light lamps for right-hand driving are generally called right distribution lamps. The shape of the light reflecting surface of the reflector is different for this type of left light distribution lamp and right light distribution lamp, so even if the lamp is the same type, there are two types of reflectors depending on whether the light distribution is left or right. There was a problem in that two types of molds were required, and the cost was high.

The present invention has been made in view of the problems of the prior art,
The purpose is to provide an automobile headlamp equipped with a reflector that can be applied to both left-hand light distribution and right-hand light distribution.

[Means to solve the problem]

In order to achieve the above object, in the projection type automobile headlamp according to the present invention, a reflector having a built-in light source is supported by a lens holder in front of a reflector that has a built-in light source in a light chamber space formed by a lamp body and an outer lens. In a projection type automobile headlamp that is equipped with a projection unit that has a projection lens assembled and integrated, the reflector is fixed by shifting it horizontally from the center of the lens to the left or right depending on whether the light distribution is on the left or the right. This is how it is placed.

[Effect]

For the left light distribution lamp, when looking at the lamp from the front, the reflector
For right distribution lamps, the reflector is shifted horizontally to the left side of the center of the lens (the lens is to the right horizontally with respect to the reflector). By shifting the lens to the right side (horizontally to the left side with respect to the reflector), a predetermined left or right light distribution can be obtained, and by changing the mounting position of the single-shaped reflector with respect to the lens holder, The left light distribution and the right light distribution can be used properly.

〔Example〕

Next, an embodiment of the present invention will be described based on the drawings.

Figures 1 to 7 show a projection type motorcycle headlamp which is an embodiment of the present invention. Figure 1 is a front view of the headlamp, and Figure 2 is a partially cutaway view. 3 is a horizontal cross-sectional view of the same headlamp (a cross-sectional view taken along the line nn shown in FIG. 1), FIG. 3 is a vertical cross-sectional view of the same headlamp (a cross-sectional view taken along the line ■-■ shown in FIG. 1), FIG. 4 is a front view of the outer lens showing the diffusion step formed on the outer lens, and FIG. 5 is a diagram showing the light distribution pattern of the headlamp.
FIG. 6 is a plan view showing the irradiation area of the headlamp, and FIG. 7 is an exploded perspective view of the projection unit showing the connection portion between the lens holder and the reflector.

In these figures, reference numeral 10 denotes a container-shaped lamp body, and an outer lens 12 is assembled to the front opening of the lamp body 10 to form a lamp chamber space 14.

Inside the lamp body 10, a reflector 20 into which a bulb 22 is inserted and a projection unit 30 that projects light are arranged side by side on the left and right.

Inside the reflector 20 is a parabolic light reflecting surface 24.
is formed, and a bulb 22 is inserted into a bulb insertion hole formed at the rear top of the reflector 20 from behind the reflector. The light emitted from the filament 23 of the bulb 22 is reflected by the light reflecting surface 24, becomes parallel light, enters the outer lens 12, and is directed in a predetermined direction by the diffusion step S1 (see FIG. 4) formed in the outer lens 12. The light is diffused and distributed. Incidentally, a diffusion step S for diffusing and distributing light diagonally upward and outward in the left and right direction is formed at the diagonally upper left and right positions of the outer lens 12 at a position facing the bulb 22, as shown in FIG. As shown in FIG. ing. Therefore, visibility to the driver during bank driving and visibility at a distance from the driver are good.

Further, as shown in FIG. 1, a reflector 20 is provided.

The aiming screw is supported at three points: two aiming screws 16 and 17 that are supported by the rear wall of the lamp body and extend forward and backward, and a swing fulcrum 18 of a ball joint structure that projects forward from the rear wall of the lamp body. 16.1
The reflector 20 is tilted by the rotation operation 7, and thereby the irradiation axis L1 can be adjusted in the vertical and horizontal directions.

The projection unit 30 has a projection lens 36 at the front opening of an ellipsoidal reflector 31 in which a bulb 32 is built.
A lens holder 37 that holds the lens is assembled into an integrated structure. A light reflecting surface 34 formed by vapor deposition of aluminum is formed inside the reflector 31.
A bulb 32 is inserted into a bulb insertion hole formed at the rear top of the reflector 1 from behind the reflector. The filament 33 of the bulb 32 is located at the first focal point f of the light reflecting surface 34, and the reflected light on the light reflecting surface 34 is irradiated at the second focal point f2 of the light reflecting surface, as shown in FIG. axis (optical axis)
The light intersects with Lz and is guided to the projection lens 36 in front, and the projection lens 36 makes the light almost parallel and projects it forward.

An inner flange-shaped engagement recess 37a is formed at the front end of the lens holder 37, and the flange-shaped outer peripheral edge 36a of the lens 36 is engaged with the inner flange-shaped engagement recess 37a through adhesive silicone. A lens 36 is caulked and fixed to the front end of the lens holder. Lens holder 3
Inside 7, a shade 38 for forming a clear cut, which is integrated with the holder, closes approximately the lower half of the optical path. The shade 38 has a fan-shaped shape with the right side cut diagonally downward when viewed from the front, so that the projected light forms a light distribution pattern suitable for right-hand light distribution. Also, lens holder 3
7 and the shade 38 are integrally molded and made of die-cast aluminum, and an opening 39 is formed in the lower area of the shade to ensure air circulation between the space areas 39a and 39b in front and behind the shade. The formation of convection within the projection unit 30 is activated through this opening 39, and the heat dissipation effect is enhanced. The upper end of the shade 38 is located near the second focal point f2 of the light reflecting surface 34 of the reflector and spaced from the projection lens 36 by the focal length of the lens 36. Further, in a region of the outer lens 12 facing the projection unit 30, a projection light passage region 12A having a circular shape that is one size larger than the aperture of the radiation lens 36 and without steps is formed (see FIG. 4).
is formed, is reflected by the light reflecting surface 34, and is projected onto the projection lens 36.
The incident light is projected forward by the projection lens 36, and a clear rear cut line following the upper end of the shade is formed in the light distribution pattern of the projected light. Note that reference numeral 40 denotes a shade portion rising upward from the lower edge of the opening 39, and the reflected light on the inner circumferential surface of the lens holder 37 enters the projection lens 36 through this opening 39.
This is a part to block harmful light that may appear above the clear cut line. Also outer lens 1
A diffusion step S2 having a shape corresponding to the diffusion step S1 formed in the outer lens region in the left half of FIG. 4 is formed in a region other than the projection light passage region 12A of FIG.
There is a uniform pattern on the entire front surface of the lens 12, emphasizing the sense of unity of the lamp when the lamp is not lit.

Further, a diffusion step S3 (see FIGS. 3 and 4) for diffusing light in the vertical direction is formed in the arcuate lower region 12B within the projection light passage region 12A of the outer lens 12. The curvature of the step surface of the diffusion step S3 with respect to the vertical plane is increased downwardly, and this diffusion step formation region 1
When the light enters 2B, it is diffused and distributed downward as shown by the symbol □ in FIG. 3 at the time of emission, and the excessive brightness difference in the boundary area between the irradiated area and the non-irradiated area is reduced.

That is, FIG. 6 shows the irradiation area of the headlamp shown in this embodiment, where reference numeral 50 denotes a vehicle body, and a parabolically extending boundary area C is formed between the irradiation area A and the non-irradiation area B. However, a part of the projected light is diffused and distributed in the boundary area C by the diffusion step S3, so the illuminance in this boundary area C gradually decreases from the irradiation area A toward the non-irradiation area B, and the illuminance in the boundary area C gradually decreases. The contrast between brightness and darkness has been reduced compared to before. Therefore, for the driver, there is no sudden change in illuminance in the boundary area C, and even the non-illuminated area B is bright to some extent up to the front of the vehicle body 50, resulting in good visibility for the driver.

Further, the headlamp shown in this embodiment is a right-hand light distribution lamp as described above, and the optical axis L2 of the light reflecting surface 34 of the reflector is
□ is placed eccentrically by d to the right side in the horizontal direction (right side when looking at the lamp from the front) with respect to the central axis L2□ of the lens. That is, the light reflecting surface 34 of the reflector has a symmetrical shape, the filament 33 of the bulb is located at the first focal point f□ of the light reflecting surface 34, and both the lens holder 37 and the projection lens 36 have a perfect circular shape. And both 37, 36
The central axes of are coincident. Then, the reflector 31 and the lens holder 37 are brought together by a flange 31a formed at the front opening of the reflector 31 and a flange 37a formed at the rear end opening of the lens holder, and both are screwed together. It is fixed by this.

FIG. 7 is a perspective view showing the lens holder and reflector separated, and reference numerals 62a to 62d, 64a to 64d are screw holes drilled in the reflector side flange 31a;
Reference numerals 72a to 72d and 74a to 74d indicate screw holes drilled in the lens holder side flange 37a, respectively. and screw holes 62a to 62d and 72a to 72
When the screw holes 62a-62d and 72a-72d are aligned (see Figure 2), the lens center axis L2□ On the other hand, the optical axis L21 of the light reflecting surface 34 is at a position eccentric to the right side in the horizontal direction, that is, a state suitable for right-hand light distribution. On the other hand, when the screw holes 64a to 64d and 74a to 74d are aligned (see FIG. 8), when the lamp is viewed from the front, the center axis of the lens is aligned. In contrast, the optical axis L2□ of the light reflecting surface 35
is eccentric to the left, that is, a state suitable for left-hand light distribution. Therefore, if you want to use a left-hand light distribution lamp, the lens holder 37A has a shade 38A for left light distribution (a fan-shaped shade with the left side cut diagonally downward when viewed from the front).
The reflector 31 and the reflector 31 may be screwed together as shown in FIG.

Furthermore, in the past, a layered striped pattern (generally referred to as chromatic aberration) in which the color changes from blue to red along the clear cut line appears due to the difference in spectral intensity, but this example is effective in reducing this chromatic aberration. was confirmed. Although this is not certain in principle, it is believed that arranging the central axis L2□ of the lens and the optical axis Lz1 of the light reflecting surface 34 eccentrically to the left and right in the horizontal direction is effective in reducing chromatic aberration. Seem.

As shown in FIG. 1, the projection unit 30 is supported by three points: two aiming screws 46 and 47 that are supported on the back wall of the lamp body and extend back and forth, and a swing fulcrum 48, screw 46.4
7, the irradiation axis L2 of the projection unit 30 can be adjusted in the vertical and horizontal directions independently of the reflector 20.

In addition, in the embodiment described above, the reflector side flange 31
8 screw holes are formed in each of the lens holder side flange 37a and 62a, 62c, 64b, 64d and 72a located diagonally.
, 72c, 74b.

74d, each having four screw holes, and a screw hole 62a in the reflector side flange 31a.

62c and a lens holder side screw hole 72a.

72c may be a long hole extending from side to side.

Further, in the embodiment, the right light distribution lens holder (lens holder integrated with the right light distribution shade 38) 37 and the left light distribution lens holder (lens holder integrated with the left light distribution shade 38A) 37A, the screw holes formed in the right light distribution lens holder and the left light distribution lens holder may be located at different positions.

Further, although the present invention has been explained using a motorcycle as an example, the present invention is not limited to motorcycles, but can be widely applied to general automobiles and motorized bicycles.

〔Effect of the invention〕

As is clear from the above description, in the projection type automobile headlamp according to the present invention, in the left distribution lamp, the reflector is arranged horizontally to the left with respect to the center of the lens when the lamp is viewed from the front. However, in the case of a right-hand light distribution lamp, if the reflector is shifted horizontally to the right with respect to the center of the lens when the lamp is viewed from the front, a predetermined left-hand or right-hand light distribution can be obtained. By attaching and fixing the reflector to the lens holder by shifting it horizontally from side to side, it can be applied to both the left light distribution lamp and the right light distribution lamp. Therefore, only one type of mold is required for molding the reflector, and the cost of the reflector and, by extension, the cost of the lamp can be reduced.

Further, by adopting a structure in which the optical axis of the light reflecting surface of the reflector and the central axis of the projection lens are shifted in the horizontal direction as in the present invention, it was possible to reduce chromatic aberration occurring near the clear cut line. Therefore, visibility in the vicinity of the clear cut line is improved for the driver, and the color illusion caused by chromatic aberration is eliminated for drivers of oncoming vehicles.

[Brief explanation of the drawing]

FIG. 1 is a front view of a projection type motorcycle headlamp which is an embodiment of the present invention, FIG. 2 is a horizontal sectional view of the same headlamp (a sectional view taken along line nn shown in FIG. 1), Fig. 3 is a longitudinal cross-sectional view of the same headlamp (a cross-sectional view taken along the line mm shown in Fig. 1), Fig. 4 is a front view of the outer lens showing the diffusion step formed on the outer lens, and Fig. 5 Figure 6 shows the light distribution pattern of the headlamp, Figure 6 is a plan view showing the irradiation area and non-irradiation area of the headlamp, and Figure 7 shows the screw connection between the reflector and the lens holder of the projection unit. FIG. 8 is an exploded perspective view, FIG. 8 is a horizontal sectional view of a main part of a projection unit showing the arrangement structure of a reflector and a lens holder in the case of a left-hand light distribution lamp, and FIG. 9 is a sectional view of a conventional projection type headlamp. 1o...Lamp body, 12K outer lens,
14...Light room space, 3o...Projection unit,
32... Bulb serving as a light source, 31... Reflector 34... Light reflecting surface, 36...
Projection lens, 37... Lens holder S3... Diffusion step, L2□ (L2)... Optical axis of reflector (irradiation axis of lamp), L2□... Central axis of projection lens, d... - Misalignment between the optical axis of the reflector and the center axis of the projection lens. Patent applicant: Co., Ltd./H Thread Manufacturing Co., Ltd. Figure 2B (S3+ Figure 2B)

Claims (1)

[Claims] (1) A projection type in which a projection unit is provided in which a projection lens supported by a lens holder is assembled and integrated in front of a reflector containing a light source in a lamp chamber space formed by a lamp body and an outer lens. 1. A projection type automotive headlamp, characterized in that a reflector is fixedly disposed horizontally shifted from the center of the lens to the left or right depending on whether the light distribution is on the left or the right.