JP2000340011A - Vehicular lighting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance luminance by irradiating a front portion with light not used by being shielded by a light shielding hood for directly shielding light, in a vehicular lighting tool such as a headlight requiring high luminance. SOLUTION: A vehicular lighting tool comprises: a light source 1; a light shielding hood 3 for shielding light from the light source 1; and a reflector 2 for reflecting the light from the light source 1 forward. Upper openings 31, 32 are formed at the upper portion of the light shielding hood 3, for introducing part of the light from the light source 1 forward; in the meantime, a lower opening 34 is formed at the lower portion thereof. Reflecting plates 41, 42, 43 for reflecting the lights from the upper openings 31, 32 at an angle downward in a horizontal direction are connected at the front portions of the upper openings 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp for a vehicle such as an automobile and a motorcycle, and more particularly to a structure of a light shielding hood provided for directly shielding light.

[0002]

2. Description of the Related Art Lighting for automobiles is used to illuminate the front of the vehicle during night driving to visually recognize the presence of obstacles on the left and right of the road or in front of the road. Normally, 12 volts or 24
55 watts to 60 volts connected to a volt battery
A bulb with wattage power consumption is used as the light source.

Light is emitted in all directions from the filament light source of the bulb, and the luminous intensity distribution is as shown in FIG. 5 around the filament axis L2 extending in the longitudinal direction of the coiled filament. It has the highest luminous intensity distribution. In a vehicle lamp, a reflector surrounding a bulb light source is provided in order to reflect light from the bulb forward to be irradiated. Generally, the reflector has a reflection surface formed in a substantially parabolic shape having a bulb light source as a focal point, and is configured to obtain reflected light parallel to an optical axis L of a lamp set in front of the vehicle. .

As shown in FIG. 5, a bulb light source having a filament axis L2 perpendicular to an optical axis L of a vehicle lamp as shown in FIG. Such a bulb in which the central axis L2 of the filament is orthogonal to the optical axis L of the lamp is referred to as C-6.
This is called a rest valve. On the other hand, a bulb in which the central axis L2 of the filament is arranged along the optical axis L of the lamp is called a C-8 placing bulb.

FIG. 2 shows a conventional vehicular lamp 10 using the C-6 mounting bulb. The vehicular lamp 10 has a filament light source 1a and a C-light
A 6-position bulb 4 and a reflector 2 made of a reflective material which is provided to surround the bulb 4 and is formed on a substantially parabolic surface of the bulb 4 which is focused on the filament light source 1a.
A lens 5 for diffusing reflected light from the reflector 2 forward in the irradiation direction; and a bulb 4 provided in front of the bulb 4.
And a light shielding hood 3 that shields direct light from the camera. The filament light source 1b is for a passing beam,
The filament light source 1a is arranged so as to be shifted upward from the optical axis for the traveling beam of the filament light source 1a.

[0006] The reflector 2 reflects the emitted light n1 from the filament light source 1a and irradiates it forward as reflected light r1 parallel to the optical axis L. Similarly, since the reflector 2 is formed on the paraboloid, the emitted lights n2 and n3 also become reflected lights r2 and r3 parallel to the optical axis L and irradiate the front. Therefore, the light reflected by the reflector 2 does not become upward dazzling light.

From the filament light source 1a, there is strong direct light directed forward. The light shielding hood 3 is provided in order to prevent the strong upward direct light from the filament light source 1a from becoming dazzling and dazzling light to the driver of the oncoming vehicle. FIG. 3 is a schematic diagram of the light shielding hood 3. C-6 Filament axis L of light source 1 of bulb 4
2 is arranged so as to be able to make maximum use of the light of the light source 1 because it is arranged orthogonally to the optical axis L of the vehicular lamp. In this bulb, light having a high luminous intensity distribution can be emitted to the reflector 2 provided so as to surround the bulb in the vertical and horizontal directions from the rear, and a parallel light beam can be emitted forward. On the other hand, half of the emitted light n directly emitted forward is dazzling light directed upward, so that it is blocked by the shielding hood 3.

However, as shown in the schematic diagram of FIG. 4, the light-shielding hood 3 that directly shields the light conceals approximately half of the amount of light of the C-6 holder that can efficiently use the light, and reduces the illuminance of the entire lamp. Let me.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a vehicular lamp, such as a headlamp, for which high illuminance is required. It is an object of the present invention to provide a vehicular lamp that illuminates the front and improves illuminance.

Further, there is provided a vehicular lamp capable of reflecting upward direct light, which is a dazzling light to oncoming vehicles, to obtain downward irradiation light.

[0011]

SUMMARY OF THE INVENTION A vehicular lamp of the present invention comprises:
In order to solve the above-described problem, a light source, a light-shielding hood disposed in front of the light source so as to cover the light source and shielding light from the light source, and a reflector disposed behind the light source and reflecting light of the light source forward. An upper opening is formed above the optical axis of the light source in the light shielding hood, and an upper opening for guiding a part of the light from the light source forward is formed, and a lower opening is formed below the optical axis of the light source. A reflector for reflecting the light from the upper opening at an angle lower than horizontal is provided continuously in front of the upper opening.

[0012] By forming the upper opening,
Light that is shielded and not used can be used as effective light for irradiating the front, and the illuminance of the vehicle lamp can be increased. In addition, the light that is blocked and not used due to the formation of the lower opening can be used as effective light for irradiating the front, and the illuminance of the vehicle lamp can be increased.

[0013] Further, since the reflecting plate for reflecting the light from the upper opening at an angle lower than the horizontal angle is provided continuously in front of the upper opening, a filament light source having high brightness can be directly provided from the front. It does not become visible and reflects the direct light slightly downward from the substantially horizontal optical axis, thereby preventing dazzling light for oncoming vehicles.

Further, by disposing a diffusion lens cut or a cylindrical lens in front of the light-shielding hood in the irradiation direction, it is possible to obtain illumination of a desired light distribution pattern according to the vehicle width and the like, and to obtain a bright and dazzling vehicle. Lighting device.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. The figures schematically show the dimensions, shapes and positional relationships of the components so that the present invention can be understood. The same components as those in the drawings used in the description of the related art are denoted by the same reference numerals. Further, the embodiment will be described by taking a cylindrical light-shielding hood as an example. However, the present invention is not limited to a cylindrical light-shielding hood, but may be any light-shielding hood such as a hemispherical or flat plate.

FIG. 1 is a sectional view of a vehicular lamp according to an embodiment of the present invention. A light source 1 and a light shielding hood disposed in front of the light source 1 so as to cover the light source 1 and shielding light from the light source 1 are shown. 3 and a reflector 2 disposed behind the light source 1 and reflecting the light of the light source 1 forward, and a part of the light from the light source 1 is located above the optical axis L of the light source 1 in the light shielding hood 3. Upper openings 31, 32, 33 leading forward are formed, and a lower opening 34 is formed below the optical axis L of the light source 1, and the upper openings 31, 32, 33 are formed.
Reflectors 41, 42, 43 for reflecting the light from 33 at an angle lower than horizontal are connected in front of the upper openings 31, 32, 33.

The light source 1 is a so-called C-6 holder in which the filament central axis L2 of the coiled filament light source 1 provided in the bulb 4 is arranged so as to be orthogonal to the optical axis L of the lamp. Is used. For this reason, the arrangement is such that the light emitted from the light source 1 can be utilized to the maximum, and high illuminance can be obtained (see the luminous intensity distribution around the filament in FIG. 5).

The light source 1 is disposed at the focal point of the reflector 2 formed on a substantially paraboloid. With this arrangement, the emitted light n1 from the light source 1 to the rear upward direction,
n3 is reflected by the paraboloid of the reflector 2, becomes reflected light r1 and r3 parallel to the optical axis L, and is emitted forward.

Similarly, the light beams n2 and n4 emitted downward from the light source 1 are also reflected by the paraboloid of the reflector 2 and become reflected light beams r2 and r4 parallel to the optical axis L, and are emitted forward.
Also, the emitted light n5, n6 that goes upward and downward from the light source 1 and grazes through the end of the light shielding hood 3 is reflected by the reflector 2 as well.
Reflected light r5, r6 parallel to the optical axis L
It is irradiated forward.

As described above, the light traveling backward and the light traveling upward and downward from the light source 1 become a light flux parallel to the optical axis L traveling forward, and illumination light of high illuminance without attenuation due to scattering can be obtained.

An optical axis L is provided on a light shielding hood 3 which is disposed in front of the light source 1 so as to cover the light source 1 and shields light from the light source 1.
An upper opening 31 for guiding a part of the light from the light source 1 forward is formed above the upper opening 3.
Reflecting plate 41 provided at an angle to reflect outgoing lights n9 and n10 toward 1 at an angle lower than horizontal.
Are provided continuously in front of the upper opening 31.

The reflection plate 41 extends forward from the upper end of the upper opening 31 like an eave, and its surface is surface-treated with a reflective material to reflect the light emitted from the light source 1.

The outgoing light n9 is reflected by the reflecting plate 41 and becomes downward reflected light r9, which is emitted forward. Also,
The outgoing light n10 is reflected at the tip of the reflection plate 41, becomes reflected light r10 slightly downward from the optical axis L, and is emitted forward. In this embodiment, the reflection plate 41 is set so that the emitted light n10 is reflected downward by 0.57 degrees with respect to the optical axis L.

The provision of the opening 31 makes it possible to make use of the forward light from the light source 1 which has become invalid light which has not been used in the past as illumination light, and a reflecting plate connected to the opening 31. By 41, the light path is directed downward and forward, the light source 1 is not directly seen from the front, and it is possible to prevent glare light (glare).

In this embodiment, a second opening 32 and a third opening 33 are further provided on the upper surface of the light shielding hood 3. The second opening 32 is provided with a second reflection plate 42 connected thereto. The light emitted from the light source 1 toward the second opening 32 is directed downward by 0.57 degrees with respect to the downward reflected light r11 and the optical axis L. The reflected light r12 is directed forward while changing its course. The second reflector 42 reflects the reflected light r reflected by the first reflector 41.
The light source 1 does not directly obstruct from the front because it is extended in an eaves-like shape so as not to block the light source 9. Similarly, the outgoing light toward the third opening 33 is also slightly forward-diverted and radiates forward. Although the description of this embodiment has been made with respect to three openings, one or more openings may be provided. Also,
The reflector is not limited to a flat plate, but may be a curved surface or a wavy shape.

Further, below the light shielding hood 3, a light source 1 is provided.
A lower opening 34 is formed slightly below the optical axis L of the light source 1 so that emitted light beams n13 and n14 directed downward from the light source 1 can be emitted forward. Outgoing light n toward lower hood 35
8 is reflected by the lower hood 35 and reflected toward the upper part of the reflector 2 to become reflected light r parallel to the optical axis L. As described above, the light shielding hood 3 of the present invention becomes the direct light among the emitted light n from the light source 1 in the related art, so that most of the emitted light n blocked by the light shielding hood 3 can be used.

Further, by disposing a lens cut 5 for diffusion or a cylindrical lens in front of the light-shielding hood 3 in the irradiation direction, illumination of a desired light distribution pattern according to the vehicle width and the like can be obtained, and at the same time, bright and dazzling. There can be no vehicular lighting.

[0028]

According to the vehicle lighting device of the present invention, since the upper opening is formed in the light shielding hood, light that is shielded and not used is made effective light for irradiating the front, and the illuminance of the vehicle lighting device is reduced. Can be higher. In addition, since the lower opening of the light-shielding hood is formed, light that is shielded and not used is made effective light for irradiating the front, and the illuminance of the vehicle lamp can be increased.

Further, since the reflector for reflecting the light from the upper opening at an angle lower than the horizontal angle is provided in front of the upper opening, the filament light source with high brightness cannot be directly seen from the front. At the same time, the direct light is reflected slightly downward from the substantially horizontal optical axis, and no dazzling light is generated for oncoming vehicles.

Furthermore, by providing a lens cut for diffusion or a cylindrical lens in front of the light-shielding hood in the irradiation direction, it is possible to obtain illumination of a desired light distribution pattern according to the vehicle width and the like, and it is bright and not dazzling. A vehicular lamp can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vehicular lamp according to an embodiment of the present invention.

FIG. 2 is a perspective view of a conventional vehicle lamp.

FIG. 3 is a perspective view showing a main part of a conventional light shielding hood.

FIG. 4 is a cross-sectional view of a conventional light-shielding hood.

FIG. 5 is a diagram showing a luminous intensity distribution of a C-6 holder bulb.

[Explanation of symbols]

 L Optical axis L2 Filament central axis n Emitted light r Reflected light 1 Light source 1a, 1b Filament light source 2 Reflector 3 Light shielding hood 4 Valve 5 Lens 31, 32, 33 Upper opening 34 Lower opening 41, 42, 43 Reflector

Claims (1)

[Claims] A light shielding hood disposed in front of the light source to cover the light source and shielding light from the light source; and a reflector disposed behind the light source and reflecting light of the light source forward. An upper opening is formed above the optical axis of the light source in the light shielding hood to guide a part of the light from the light source forward, and a lower opening is formed below the optical axis of the light source, A reflector for an automobile, wherein a reflector that reflects light from the upper opening at an angle lower than horizontal is provided in front of the upper opening.