JPH04135103U - Vehicle headlight lens - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to provide a lens for a vehicle headlight that does not give glare to the driver of an oncoming vehicle. [Configuration] Prisms with small left and right diffusion were used in the first prism zone, which mainly forms the part slightly below the horizontal cut line of the light distribution pattern. It is possible to suppress the spread of both ends of the portion slightly below the horizontal cut line, and prevent the ends from rising. In addition, at the boundary between the left and right small diffusion prism zones and the prism zone for forming a horizontally cut light distribution pattern, a stepped portion is provided to emit the light incident on the boundary as downward light.
The light incident on the stepped portion of the boundary can be emitted as downward light. Therefore, there is no risk of giving glare to the driver of an oncoming vehicle.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a vehicle headlight lens with a downwardly inclined lens surface, and is particularly applicable to vehicle headlight lenses. This relates to vehicle headlight lenses that do not give glare to oncoming drivers. Ru.

0002

[Conventional technology]

Hereinafter, a conventional vehicle headlamp lens will be described with reference to FIGS. 5 to 8. In FIG. 5, 1 is a housing. Opens on the front and rear of this housing 1. Openings 10 and 11 are opened respectively.

0003 In the figure, 2 is a lens. This lens 2 is as shown in FIGS. 6 and 7. , on the inner surface, from the upper edge to slightly below the horizontal axis H-H, and perpendicular to the left edge. The first prism zone 21 from the axis V-V and from the upper edge to the horizontal axis H-H. and the second prism zone 22 from the right edge to the vertical axis V-V. and has. These prisms mainly consist of cylindrical concave prisms. Said first The prism zone 21 is a substantially horizontal cup near the horizontal axis H-H, as shown in FIG. The horizontal cut line 23 and the first light distribution pattern of the part extending from the horizontal cut line 23 downward to the left and right. A turn 24 is formed respectively. Further, the second prism zone 22 is shown in FIG. As shown in , near the horizontal axis H-H and approximately 15° from the approximately vertical axis V-V. The inclined cut line 25 and the part that spreads to the left and right below from the 15° cut line 25 2nd light distribution patterns 26 are respectively formed. This lens 2 is attached to the front opening 10 of the housing 1. As a result, A lamp chamber 20 defined by the housing 1 and the lens 2 is formed. This lens 2 is shown in Figure 5 when the lamp body is attached to the vehicle body (not shown). As such, it is tilted downward.

0004 In Figure 5, 3 is a movable reflector, and this movable reflector 3 is located on the front side (inner surface). For example, it has a reflective surface 30 in the form of a paraboloid of revolution on the side), is open at the front, and has a through hole 3 at the rear. 1 is provided, and a light source bulb fitting 32 is provided around the periphery of the through hole 31. This movable riff The receiver 3 can be rotated on the housing 1 by a pivot bearing mechanism (not shown). Attach. As a result, the movable reflector 3 is rotatably housed within the lamp chamber 20. It will be done.

[0005] In FIG. 5, 4 is a light source bulb, for example, an H4 type bulb. This light source bar Lube 4 includes a glass tube 40 and a main filament disposed inside this glass tube 40. (Filament for traveling beam) 46 and sub-filament (Filament for passing beam) 46 filament) 47 and a light shielding body 4 disposed below the sub-filament 47. 8, a light shielding film 49 provided at the front end of the glass tube 40, and a light shielding film 49 provided on the front end of the glass tube 40. A cap 41 integrally provided from the rear and a flange 4 integrally provided in the middle part of the cap 41 2, and a terminal 43 protruding from the rear of the base 41. This light source bar The light beam 4 is reflected from the rear through hole 31 of the movable reflector 3 to the front surface of the movable reflector 3. The light source bulb 4 is inserted into the surface 30 side, and the flange 42 of the light source bulb 4 is inserted around the through hole 31 of the movable reflector 3. The light source bulb 4 is attached to the movable reflector by the fixture 32 of the movable reflector 3. It is removably attached to the computer 3. As a result, the light source bulb 4 is connected to the movable reflector 3. The main filament 46 and sub filament of the light source bulb 4 are arranged on the front side. The lament 47 is aligned with the rotation center axis (optical axis) Z-Z of the reflective surface 30 of the movable reflector 3. The main filament 46 is located parallel to the reflective surface 30 of the movable reflector 3. is located near the focal point F. 44 is a rubber cap tightly attached to the base 41 of the light source bulb 4, and 45 is the rubber cap. A mounting key that brings the peripheral edge of the cap 44 into close contact with the rear opening 11 of the housing 1 It is a cap.

[0006] Thus, when the sub-filament 47 of the light source bulb 4 is turned on, the sub-filament 47 of the light source bulb 4 is turned on. The light from the filament 47 is reflected by the reflective surface 30 of the reflector 3, and the reflected light The light is controlled by the first prism zone 21 and the second prism zone 22 of the lens 2. As a result, a light distribution pattern for passing each other as shown in FIG. 8 is obtained. Note that the portion indicated by the broken line in FIG. 8 above, that is, the light distribution pattern for passing each other, horizontal cut line 23 (and the horizontal cut line below the 15° cut line 25) It also includes the extension line of 23. ) to slightly below the third light distribution pattern 27 is as follows: The first prism zone 21 is mainly located near the optical axis Z (horizontal The upper limit is approximately 30 mm above the axis H-H (as indicated by the chain double-dashed line in The third prism zone 28 is formed by the third prism zone 28 (portion shown). Note that the vehicle headlight lens mentioned above is for driving on the left, so for driving on the right, the left and right lenses are reversed. becomes.

[0007]

[Problem that the idea aims to solve]

In such a vehicle headlamp, an ideal light distribution pattern for passing each other as shown in FIG. It is important to get the turn. In other words, this light distribution pattern for passing each other is A horizontal cut line 90 slightly below the horizontal axis H-H and to the right of the vertical axis V-V, A first light distribution pattern 91 in a portion extending from the horizontal cut line 90 downward to the left and right. , a cut at an angle of approximately 15° near the horizontal axis H-H and to the left of the vertical axis V-V. line 93 and the second light distribution pattern of the part extending from the 15° cut line 93 downward to the left and right. It consists of turn 92. As a result, this ideal light distribution pattern for passing each other , do not give glare to oncoming drivers.

[0008] On the other hand, in the above-mentioned vehicle headlamp, the lens 2 is inclined downward. For this purpose, detailed explanations are provided in Japanese Patent Publication No. 45321/1983, which the applicant previously filed. As shown in the figure, both ends of the light distribution pattern for passing each other rise upward. Become.

[0009] However, with the conventional lens described above, both ends of the light distribution pattern for the above-mentioned passing Since no measures were taken to prevent the vehicle from climbing up, as shown in Figure 8, At both ends of the third light distribution pattern 27 of the light distribution pattern for The part 29 shown rises above the horizontal axis H-H, especially the rising part on the right side. 29, it will give glare light to the driver of the oncoming vehicle.

0010 This invention is a vehicle headlight lens that does not give glare to oncoming drivers. The purpose is to provide.

[0011]

[Means to solve the problem]

This invention is a means to solve the above problems by horizontal cutting near the horizontal axis. line and the first light distribution pattern below the horizontal cut line and spreading to the left and right horizontal cut of the first light distribution pattern in the first prism zone forming the The prism zone mainly forms the light distribution pattern slightly below the line. In addition to installing a prism with small left and right diffusion on the lens, this small left and right diffusion prism The light incident on the upper and lower boundaries of the prism zone and the first prism zone is The present invention is characterized in that a stepped portion is provided to emit downward light.

0012

[Effect]

This invention uses small diffusion prism zones on the left and right sides to reduce the horizontal portion of the first light distribution pattern. By suppressing the spread at both ends of the light distribution pattern slightly below the cut line, It is possible to prevent both ends from rising. In addition, the left and right small diffusion prism zones and the first The step at the boundary with the prism zone allows the light incident on the step at the boundary to be directed downward. It can be emitted as Therefore, it gives glare to oncoming drivers. There is no risk that this will happen.

[0013]

【Example】

An embodiment of the vehicle headlamp lens according to the present invention will be described below with reference to FIGS. 1 to 4. I will explain. In the figure, the same reference numerals as in FIGS. 5 to 9 indicate the same parts.

[0014] In the figure, 5 is the left and right small diffusion prism zone as the third prism zone. Ru. This left and right small diffusion prism zone 5 is the main part of the first prism zone 21. The upper limit is around the optical axis Z and approximately 30mm above the optical axis Z (horizontal axis H-H). (indicated by thick solid lines and grid hatching in Figure 1) I'm being kicked. This left and right small diffusion prism zone 5 is arranged for passing each other as shown in FIG. Among the light patterns, the horizontal cut line 23 (and 15° cut line) of the first light distribution pattern 24 It also includes an extension of the horizontal cut line 23 below the cut line 25. ) to slightly below The third light distribution pattern in the part (the part shown by the broken line and grid hatching in Figure 4) 51 is mainly formed. This left and right small diffusion prism zone 5 is 2 and 3, the prism with small left and right diffusion, that is, the first prism It forms a cylindrical concave surface with a radius RB larger than the radius RA of the prism of the zone 21. this Move the left and right small diffusion prism zones 5 in parallel to the inner surface in the thickness direction of the lens 2 by a distance T I'll let you. As a result, the left and right small diffusion prism zone 5 and the first prism zone At the upper and lower boundary (upper boundary) with 21, the light I incident on the boundary is called the downward light O. A stepped portion 52 is provided for emitting light.

[0015] The vehicle headlamp lens of the present invention in this embodiment has the above configuration. Therefore, the light incident on the left and right small diffusion prism zone 5 has a small left and right diffusion. shot. As a result, the third light distribution pattern is As shown in the turn 51, the width of both ends of the third light distribution pattern 51 is suppressed and It is possible to prevent the rise of both ends of the In addition, the upper boundary between the left and right small diffusion prism zones 5 and the first prism zone 21 The light I that has entered the step portion 52 will be emitted as downward light O. Therefore, there is no risk of causing glare to the driver of an oncoming vehicle.

[0016] In the above embodiment, the first prism zone above the left and right small diffusion prisms 5 is If the right and left diffusion in the lens 21 is sufficiently achieved, the left and right small diffusion prisms 5 described above can be used. It is possible to compensate for the insufficient spread of light distribution to the left and right sides at the horizontal cut line. Visibility on the road shoulder can also be improved.

[0017] In addition, the left and right diffusion angle of the left and right small diffusion prisms 5 in the above embodiment is ±15. However, the left and right diffusion angle of this left and right small diffusion prism 5 is within the lens 2 It is determined by the inclination angle of

[0018] Note that the lens of the vehicle headlight in the above embodiment is for driving on the left; For driving, the left and right sides are reversed.

[0019]

[Effect of the idea]

As described above, the vehicle headlight lens of the present invention has a horizontal cut line near the horizontal axis. And the first light distribution pattern in the part below the horizontal cut line and spreading to the left and right A horizontal cut line of the first light distribution pattern among the first prism zones forming the The prism zone mainly forms the light distribution pattern from Since a prism with small left and right diffusion is installed in the main light distribution pattern, water in the first light distribution pattern is By suppressing the spread at both ends of the light distribution pattern from the flat cut line to slightly below, It is possible to prevent both ends from rising. Also, the upper and lower boundaries between the left and right small diffusion prism zones and the first prism zone are Since we have provided a step in the field that allows the light incident on the boundary to exit as downward light, The light incident on the stepped portion of the boundary can be emitted as downward light. Therefore, there is no risk of causing glare to the driver of an oncoming vehicle.

[Brief explanation of drawings]

FIG. 1 is a rear (inner surface) view showing one embodiment of a vehicle headlamp lens according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1.

FIG. 3 is a view taken along arrow III in FIG. 2;

FIG. 4 is an explanatory diagram of a light distribution pattern for passing each other using the lens of the present invention.

FIG. 5 is a sectional view of a vehicle headlamp.

FIG. 6 is a rear (inner surface) view showing an example of a lens of a conventional vehicle headlamp.

FIG. 7 is an explanatory diagram schematically showing a distribution range of prism zones of a lens.

FIG. 8 is an explanatory diagram of a light distribution pattern for passing each other using a conventional lens.

FIG. 9 is an explanatory diagram of an ideal light distribution pattern for passing each other.

[Explanation of symbols]

1 Housing 2 Lens 21 1st prism zone 22 Second prism zone 23 Horizontal cut line 24 First light distribution pattern 25 15° cut line 26 Second light distribution pattern 3 reflector 4 Light source bulb 5 Left and right small diffusion prisms 51 Third light distribution pattern 52 Stepped section

Claims (1)

[Scope of utility model registration request] 1. A vehicle headlamp comprising a downwardly inclined lens, a light source bulb, and a reflector that reflects light from the light source bulb in the direction of the lens, the lens being provided with a light source near the horizontal axis. A lens for a vehicle headlamp is provided with a first prism zone forming a horizontal cut line and a first light distribution pattern extending downward from the horizontal cut line to the left and right. In one prism zone, prisms with small left and right diffusion are provided in the prism zone that mainly forms the light distribution pattern slightly below the horizontal cut line of the first light distribution pattern. A lens for a vehicle headlamp, characterized in that a stepped portion is provided at the upper and lower boundaries between the diffusion prism zone and the first prism zone to emit light incident on the boundary as downward light.