JP6827680B2 - Lamp - Google Patents

Description

The present invention relates to a lamp that can be used as a headlight or the like mounted on a vehicle.

As is well known, a headlight for illuminating the front of the vehicle is mounted on the front part of the vehicle. In the case of automobiles, there are two types of headlights: high beam, which points to the front in the distance and emits light parallel to the road surface, and low beam, which directs light to the road surface at a distance of 40 m and emits light diagonally downward. It is possible to selectively switch and use them (see, for example, Patent Document 1 below).

The inventors of the present invention have already devised a compact and lightweight lighting fixture that can be used as a headlight of a vehicle equipped with both a traveling headlight and a passing headlight (see Patent Document 2 below). ..

Japanese Unexamined Patent Publication No. 2016-136468 Japanese Patent Application No. 2016-254397

In the lighting equipment disclosed in Patent Document 2 described above, the luminous flux emitted from the light source of the traveling headlight and the luminous flux emitted from the passing headlight are reflected at the same portion of a single reflector. As a result, the structure has been made compact. However, with such a configuration, it is not always easy to collect the luminous flux in any specific direction. For example, when there is a desire to increase the illuminance that illuminates the tip in the horizontal direction parallel to the road surface, it has not been easy to design a reflecting surface of a reflector that can realize this.

The present invention aims to realize a lamp that is compact, lightweight, and capable of collecting a luminous flux in a desired direction.

In the present invention, the first light source, the second light source, the third light source, and the first light source, said to be installed on one of the downward surface or the upward surface of the substrate so as to be separated from each other in the front-rear direction. It includes a second light source and a reflector that reflects the light beam radiated downward or upward from each of the third light sources toward the front, and emits light from the first light source on the reflecting surface of the reflector. The optical axis of the second illumination light emitted from the second light source hits the vicinity of the portion where the optical axis of the first illumination light drips, and the second illumination light reflected by the reflector The direction of the optical axis is inclined downward relative to the optical axis of the first illumination light reflected by the reflector, and is emitted from the third light source on the reflecting surface of the reflector. A directional reflecting portion having a cross-sectional view reflecting surface substantially along a parabolic line is provided in the vicinity of a portion where the optical axis of the third illumination light hits , and the first light source and the third light source The first illumination light and the third illumination light emitted and reflected by the reflector function as a traveling headlight having a light source along a substantially horizontal optical axis parallel to the road surface on which the vehicle travels. Then, the second illumination light emitted from the second light source and reflected by the reflector functions as a passing headlight having a light beam along an obliquely downward optical axis pointing to the road surface on which the vehicle travels. Then, in the front-rear direction, the second light source constitutes a lamp fixture located between the first light source and the third light source .

With such a thing, it is possible to collect the luminous flux emitted from the third light source in an arbitrary specific direction.

According to the present invention, it is possible to realize a lamp that is compact and lightweight and can collect light flux in a desired direction.

The side view which shows the headlight of the vehicle in one Embodiment of this invention. A side sectional view showing a main part of the lamp of the same embodiment. The figure which shows the state which projected the light flux emitted from the lamp of the same embodiment on a screen. The timing diagram which shows the control pattern of the amount of the light flux emitted from each of the 1st light source and the 2nd light source in the lamp of the same embodiment.

An embodiment of the present invention will be described with reference to the drawings. The lamp of the present embodiment is used, for example, as a headlight of a vehicle C. As shown in FIG. 1, a general automobile C faces a distant front and emits light in parallel with the road surface CL, and heads diagonally downward toward the traveling headlights H and H'and a road surface CL around a front distance of 40 m. It is equipped with both headlights L for passing light that emit light, and the headlights H and H'for traveling are turned on and the headlight L for passing is turned off, and the headlight L for passing is turned on. It is possible to switch between the state in which the headlights H and H'for traveling are turned off.

As shown in FIG. 2, the lamp fixture of the present embodiment has a first light source 3 and a second light source 3 installed on the downward surface of the substrate (which may also serve as a heat radiation plate) 1 separated from each other in the front-rear direction. The light sources 4 and the third light source 5, and the luminous fluxes H, L, and H'radiated downward from each of the first light source 3, the second light source 4, and the third light source 5 are directed forward. The reflector 2 to be reflected is the main component.

In the present embodiment, the first light source 3 outputs the first illumination light H serving as the traveling headlight, and the second light source 4 outputs the second illumination light L serving as the passing headlight. .. Then, the third light source 5 outputs the third illumination light H'that reinforces the traveling headlight. The first light source 3, the second light source 4, and the third light source 5 are, for example, light emitting diodes. The first light source 3, the second light source 4, and the third light source 5 can be turned on / off independently of each other. The control of the amount of light emitted from each of the light sources 3, 4 or 5 is a PWM that increases or decreases the average amount of current applied to the light sources 3, 4, 5 via a FET (Field Effect Transistor) or other semiconductor switching element. It can be realized by (Pulse Width Modulation) control.

The first illumination light H emitted downward from the first light source 3, the second illumination light L emitted downward from the second light source 4, and the third illumination light H emitted downward from the third light source 5. Each of the'is a reflective surface on the front side of the concave reflector 2, and is reflected by the same reflector 2 and heads forward.

The optical axis of the first illumination light H (represented by a solid line) and the optical axis of the second illumination light L (represented by a alternate long and short dash line) correspond to the common reflecting portion 21 of the reflector 2. After being reflected by the reflector 2, the optical axis of the first illumination light H is oriented parallel to the road surface CL, that is, substantially horizontal. On the other hand, the optical axis of the second illumination light L corresponds to the vicinity of the portion of the common reflecting portion 21 of the reflector 2 where the optical axis of the first illumination light H hits. Then, after being reflected by the reflector 2, it faces a direction inclined downward relative to the optical axis of the first illumination light H which is substantially horizontal.

On the other hand, the optical axis (represented by a broken line) of the third illumination light H'corresponds to the directional reflection unit 22 which is different from the common reflection unit 21 in the reflector 2 and which is reserved behind and above the common reflection unit 21. As shown in FIG. 2, the reflection surface on the front side of the directional reflection unit 22 has a parabola or a shape similar to a parabola in a side cross section cut with a vertical surface extending in the front-rear direction as a cross section. .. On top of that, the light source 5 of the third illumination light H'is located at or near the focal point of its parabola in lateral cross-section. The reflecting surface of the directional reflecting unit 22 may be a so-called parabolic mirror (parabolic mirror) or a part of the parabolic mirror. The luminous flux emitted by the third light source 5 hits the reflecting surface of the directional reflecting unit 22, and is in a direction orthogonal to the parallel line A (represented by a two-point chain line) for the parabola, that is, in the third illumination light H'. It goes in a direction almost parallel to the optical axis. In other words, the directional reflecting unit 22 collimates the third illumination light H'. As a result, the spread angle of the third illumination light H'reflected by the directional reflector 22 and heading forward is smaller than the spread angle of the first illumination light H reflected by the common reflector 21 and heading forward. Become. That is, the directivity of the third illumination light H'is increased as compared with the first illumination light H.

In the present embodiment, the third illumination light H'supplements the luminous flux for illuminating the front surface parallel to the road surface CL. Therefore, the optical axis of the third light source 5 extends from the light source 5 toward the directional reflection unit 22 once backward and downward, is reflected by the directional reflection unit 22, and travels in a substantially horizontal direction. There is.

Incidentally, a part of the light flux emitted from the third light source 5 may come toward the lower surface of the substrate 1 (rear end portion) after being reflected by the reflector 2. It is also preferable to apply a black coating or the like to the lower surface of the substrate 1 in advance so that this can be absorbed.

As shown in FIG. 3, when the illumination lights H, L, H'emitted from the lighting fixture of the present embodiment are projected onto the screen facing the vehicle C and viewed from the driver's seat of the vehicle C, the passing headlights The illumination range of the second illumination light L is biased downward from the illumination ranges of the first illumination light H and the third illumination light H'which are the headlights for traveling.

When switching from a state in which the driving headlights H and H'are turned on and the passing headlights L are turned off to a state in which the passing headlights L are turned on and the driving headlights H and H'are turned off. As shown in FIG. 4, the amount of current applied to the first light source 3 and the third light source 5 (DUTY ratio of the applied current by PWM control) is gradually reduced, and these light sources 3 and 5 are output. Gradually or stepwise reduce the amount of light beam to be applied, and gradually or stepwise increase the amount of current applied to the second light source 4 to gradually increase the amount of light beam output by the second light source 4. I will go. The period of decrease in the amount of applied current to the first light source 3 and the third light source 5 and the period of increase in the amount of applied current to the second light source 4 overlap at least in part.

When switching from a state in which the passing headlights L are turned on and the traveling headlights H and H'are turned off to a state in which the traveling headlights H and H'are turned on and the passing headlights L are turned off. In the first light source 3 and the third light source 3, the amount of the current applied to the second light source 4 is gradually or gradually reduced to gradually reduce the amount of the light flux output by the second light source 4. The amount of the current applied to the light source 5 may be gradually or stepwise increased to gradually increase the amount of the luminous flux output by the first light source 3. Also at this time, the period of decrease in the amount of applied current to the second light source 4 and the period of increase in the amount of applied current to the first light source 3 and the third light source 5 overlap at least in part.

In the present embodiment, the first light source 3, the second light source 4, and the third light source 5 are installed on the downward surface of the substrate 1 so as to be separated from each other along the front-rear direction, and the first light source 3, the above. A reflector 2 for reflecting a light beam radiated downward from each of the second light source 4 and the third light source 5 in the forward direction, and the first light source on the reflecting surface of the reflector 2. The optical axis of the second illumination light L emitted from the second light source 4 hits the vicinity of the portion where the optical axis of the first illumination light H emitted from 3 hits, and is reflected by the reflector 2. The direction of the optical axis of the second illumination light L is inclined downward relative to the optical axis of the first illumination light H reflected by the reflector 2, and the reflection surface of the reflector 2. In the vicinity of the portion where the optical axis of the third illumination light H'emitted from the third light source 5 hits, a directional reflecting portion 22 having a cross-sectional visual reflecting surface substantially along a parabolic line is provided. I made up the lighting equipment.

According to the present embodiment, it is possible to realize a lamp that emits illumination light H, L, H'in a plurality of directions that are vertically biased from each other with a more compact, lightweight, and low-cost structure, and a third illumination. It is possible to collect the luminous flux of light H'in a desired direction. In particular, the first illumination light H reflected by the common reflection unit 21 is liable to be diffused, that is, its spread angle is likely to be large, and it is necessary for the region required as a traveling headlight only by the first illumination light H. It is not easy to give the required illuminance, but it is extremely easy to give the required illuminance to the required area by superimposing the third illumination light H'reflected by the directional reflector 22 with a small spread angle. Become.

The present invention is not limited to the embodiments described in detail above. In the above embodiment, the first light source 3, the second light source 4, and the third light source 5 are installed on the downward surface of the substrate 1 arranged relatively upward, and the light sources 3, 4, and 5 are directed downward. The illumination lights H, L, and H'were emitted, but the first light source, the second light source, and the third light source were installed on the upward surface of the substrate arranged relatively below, and above those light sources. Of course, it is also possible to have a mode in which the illumination light is emitted toward the surface, that is, a structure in which FIG. 2 is turned upside down.

In the above embodiment, the common reflection portion 21 and the directional specular reflection portion 22 in the reflector 2 are integrally molded, but the common reflection portion and the directional specular reflection portion may be separate members from each other. Absent.

Further, the first illumination light H supplied by the first light source 3 and the third illumination light H'supplied by the third light source 5 are not necessarily the headlights for traveling, and the second light source 4 The second illumination light L supplied by is not necessarily a headlight for passing. For example, the first light source (first illumination light by), the second light source (second illumination light by) and the third light source (third illumination light by) are each driving headlights, especially It can be an element of variable light distribution type headlights.

In addition, the specific configuration of each part can be variously modified without departing from the spirit of the present invention.

The present invention can be applied to headlights and the like installed in vehicles.

1 ... Substrate 2 ... Reflector 22 ... Directive reflector 3 ... First light source 4 ... Second light source 5 ... Third light source H ... First illumination light (headlight for driving)
L ... Second illumination light (headlight for passing)
H'... Third illumination light (headlight for driving)

Claims (1)

A first light source, a second light source, and a third light source installed so as to be separated from each other along the front-rear direction on either the downward surface or the upward surface of the substrate.
It is provided with a reflector that reflects a light beam radiated downward or upward from each of the first light source, the second light source, and the third light source toward the front.
On the reflective surface of the reflector, the optical axis of the second illumination light emitted from the second light source hits the vicinity of the portion where the optical axis of the first illumination light emitted from the first light source hits. ,
The direction of the optical axis of the second illumination light reflected by the reflector is inclined downward relative to the optical axis of the first illumination light reflected by the reflector.
In addition, a directional reflecting portion having a cross-sectional visual reflecting surface substantially along a parabola near a portion of the reflecting surface of the reflector where the optical axis of the third illumination light emitted from the third light source hits. Is provided ,
The first illumination light and the third illumination light emitted from the first light source and the third light source and reflected by the reflector are aligned with the optical axis in a substantially horizontal direction parallel to the road surface on which the vehicle travels. Functions as a driving headlight with a luminous flux along
The second illumination light emitted from the second light source and reflected by the reflector functions as a passing headlight having a luminous flux along an optical axis diagonally downward toward the road surface on which the vehicle travels.
A lamp in which the second light source is located between the first light source and the third light source in the front-rear direction .

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