JPH06349305A - Led lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To eliminate a glaring, and to prevent to give a dazzlement to the following car, by providing wide angle lens cuts and narrow angle lens cuts alternatively to the lens. CONSTITUTION:When a lighting at a low illuminance is given as a taillight, only a lighting circuit is given so as to light an LED 21 for low illuminance, and the light is radiated to the outer side of the lighting fixture through the wide angle lens cuts 41. And when a light is given at a high illuminance as a light for braking, the lighting circuit to light the LED 21 for low illuminance is given, an LED 22 for high illuminance is also lighted, and the light through the narrow angle lens cuts 42 is added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp using an LED as a light source, and more particularly to a vehicular lamp in which the illuminance is adjusted depending on the lighting state, such as a lamp that also serves as a tail light and a brake light. It is related to.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the structure of a conventional LED lighting device 90 for a vehicle of this type. Since an LED 91a used as a light source has a narrower irradiation angle than a light bulb, In order to secure a predetermined light emitting area, a plurality of LEDs 91a are vertically and horizontally aligned on a substrate 91b to form a light source substrate 91, and the LEDs are provided in front of the light source substrate 91.
A lens 92 is provided which is opposed to each of the lens cuts 92a which gives a predetermined light distribution characteristic to each of the 91a.

The vehicle LED lighting device 90 having the above structure
In addition, for example, when the tail light and the brake light are used in common, the current applied to the LED 91a is increased / decreased. Specifically, the illuminance that is four times as high as that of the tail light is lit as the brake light. If required at the time of lighting, a quadruple current is applied when the brake lamp is turned on.

[0004]

However, in the above-described conventional vehicle LED lamp 90, the LE is not used.
Since the D91a and the lens cut 92a have a one-to-one correspondence, it is possible to strictly set the irradiation angle to a range required as the light distribution characteristic, as compared with a vehicle lamp using a light source such as a light bulb. While having the advantage that the luminous flux utilization rate is high, on the other hand, the directivity is strong, and when the dimming is performed at a high illuminance such as the above-mentioned brake light, a glaring feeling becomes strong,
A problem that causes a driver of a following vehicle to feel dazzling has been a problem to be solved. Further, as a standard, the brake lights are required to have a narrow angle and high luminous intensity, and the tail lights are required to have a wide angle and low luminous intensity.

[0005]

As a concrete means for solving the above-mentioned conventional problems, the present invention is an LED lamp for a vehicle in which an LED is adopted as a light source and light control is performed. A wide-angle lens cut with a relatively wide diffusion angle and a narrow-angle lens cut with a relatively narrow diffusion angle are alternately applied to the lens of the lamp, and a low-illuminance LED is arranged corresponding to the wide-angle lens cut. A high illuminance LED is arranged corresponding to the narrow-angle lens cut, and only the low illuminance LED is lit when dimming the vehicle LED lamp as low illuminance, and when dimming as the high illuminance. The low illumination LED and the high illumination L
LE for vehicle characterized in that both ED and ED are turned on
By providing the D lamp, the glare is eliminated and the problem is solved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 is a vehicle LED lighting device according to the present invention.
Is similar to the conventional example in that the LED 2 is used as a light source, but when mounted on the board 3, as shown in FIG. 2, each of the two systems is capable of independently blinking operation. Connected to one of the lighting circuits 31 and 32, one connected to the one lighting circuit 31 is a low illuminance LED 21, and one connected to the other one lighting circuit 32 is a high illuminance LE.
D22.

At this time, the LED 21 for low illuminance and the LED 22 for high illuminance are arranged on the substrate 3 in such a state that the LED 21 for low illuminance and the LED 22 for high illuminance are alternately arranged in both columns and rows. And is therefore
The lighting circuit 31 and the lighting circuit 32 are also wired by printed wiring or the like so as to correspond to the arrangement.

In the above structure, the low illuminance LED 2
The LED 1 for high illuminance and the LED 22 for high illuminance do not need to have a difference in characteristics between those having high brightness and those having low brightness, for example, and the LEDs 2 of the same standard may be used. Therefore, in the vehicle LED lighting device 1 of the present invention, one type of LED 2
Can be implemented in

As described above, the lens 4 is provided in front of the low illuminance LED 21 and the high illuminance LED 22 arranged on the substrate 3, but in the present invention, the lens 4 has a low illuminance. Wide-angle lens cuts 41 correspond one-to-one to the LED 21 for use, and narrow-angle lens cuts 42 also correspond to the one-to-one to the high-illuminance LEDs 22.

Here, the wide-angle lens cut 41 and the narrow-angle lens cut 42 will be described. First, the narrow-angle lens cut 42 is the same as the conventional one.
The light from the LED 22 for high illuminance has a relatively narrow diffusion angle that gives a minimum irradiation angle sufficient for satisfying the light distribution characteristics defined as a brake light, for example, a convex lens shape. Is formed as.

On the other hand, the wide-angle lens cut 41
Is a relatively wide diffusion angle that gives a wider illumination angle to the light from the low-illuminance LED 21 than the light distribution characteristic defined as the above-mentioned brake light, and is specifically formed as a concave lens shape. It is a thing.

FIG. 3 shows a state in which the wide-angle lens cut 41 and the narrow-angle lens cut 42 are arranged on the surface of the lens 4, and as described above, the LE for low illuminance.
Since the D21 and the high illuminance LEDs 22 are alternately arranged on the substrate 3, the wide-angle lens cuts 41 and the narrow-angle lens cuts 42 corresponding thereto are also alternately arranged.

When the LED lighting device 1 for a vehicle having the above-described structure is to be turned on, for example, for lighting a tail lamp at a low illuminance, only the lighting circuit 31 is turned on to turn on the low illuminance LED 21 to cause the wide-angle lens. Light is emitted to the outside of the lamp through the cut 41. In addition, for example, when lighting with a high illuminance is performed for a brake light, the lighting circuit 31
And the lighting circuit 32 are both turned on, and the LED for low illumination is
In addition to 21, the high illuminance LED 22 is also turned on to add light through the narrow-angle lens cut 42.

Next, the operation and effect of the vehicle LED lighting device 1 of the present invention having the above structure will be described. First, a state in which the low illuminance LED 21 and the high illuminance LED 22 are separately turned on will be described in advance. First, when only the low illuminance LED 21 is turned on, the low illuminance LED 21 is turned on. Since the light emitted from is emitted to the outside through the wide-angle lens cut 41 having a relatively wide diffusion angle, the lens 4 surface is relatively outside from the outside in comparison with the light emission amount of the low illuminance LED 21. It will be viewed as low brightness.

On the other hand, when the LED 22 for high illuminance is turned on, the light emitted from the LED 22 for high illuminance is emitted to the outside through the narrow-angle lens cut 42 having a narrow diffusion angle. , LED22 for high illuminance
Even when the low illuminance LED 21 and the low illuminance LED 21 are of the same standard, when the high illuminance LED 22 is turned on, the four surfaces of the lens are viewed as much higher brightness than when the illuminance LED 21 is turned on. Become.

In the present invention, since only the low illuminance LED 21 is turned on when the dimming is performed with a low illuminance, when an element of the same standard is radiated to the outside through the wide-angle lens cut 41, it is used. In addition, from the outside, the surface of the lens 4 is viewed as having a relatively low luminance, which meets the purpose.

At this time, since the low illuminance LEDs 21 are arranged alternately with the high illuminance LEDs 22 as described above, the density naturally decreases when only the low illuminance LEDs 21 are turned on. However, the distance between the respective light sources is increased, but the wide-angle lens cut 41 overlaps due to the wide diffusion angle, so that the brightness difference between the four surfaces of the lens does not occur.

When the brightness is high, the LE for low illuminance is used.
D21 and the LED 22 for high illuminance are turned on at the same time. At this time, the LED 22 for high illuminance is radiated to the outside through the narrow-angle lens cut 42, and the lens 4 surface has a relatively high brightness from the outside. Will be seen as.

At the same time, since light with a wide irradiation angle is emitted from the low illuminance LED 21, the combined light has a wide irradiation angle, and a glaring feeling occurs due to the narrow irradiation angle. For example, the dazzling sensation given to the driver of the following vehicle is eliminated. In actual implementation, when switching between high illuminance and low illuminance, the low illuminance LED 21 and the high illuminance LED 2
Since the glaring feeling can be further reduced by means such as adjusting the ratio of the current applied to No. 2, it is preferable to make an appropriate adjustment.

Further, in the practice of the present invention, as described above, it is not limited to the dimming of the illuminance when the taillight and the brake light are used in common, and for example, it is referred to as a two-level lighting. It goes without saying that it may be adopted as the light control means of the lamp in the above. Also,
It can also be applied to a lamp having two other functions.

[0021]

As described above, according to the present invention, the lens is alternately subjected to the wide-angle lens cut and the narrow-angle lens cut, and the low illuminance LED corresponds to the wide-angle lens cut. A high illuminance LED is arranged corresponding to the narrow-angle lens cut, and only the low illuminance LED is turned on when dimming the vehicle LED lamp as a low illuminance, and the low illuminance is dimmed when the dimming is performed as a high illuminance. LED
LE for vehicle in which both the LED and the LED for high illuminance are turned on
By using the D lamp, especially when lighting at a high illuminance that tends to cause glare, the low illumination LED having a wide-angle lens cut with a relatively wide illumination angle is kept on to provide a total illumination angle. The width is wide, and the dazzling sensation given to the driver of the following vehicle is eliminated, and an extremely excellent effect is provided for improving the quality of this type of vehicle LED lighting device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vehicle LED lighting device according to the present invention.

FIG. 2 is a wiring diagram showing electric wiring of the same embodiment.

FIG. 3 is an explanatory diagram showing an example of arrangement of lens cuts.

FIG. 4 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 ... Vehicle LED lamp 2 ... LED 21 ... Low illumination LED 22 ... High illumination LED 3 ... Substrate 31, 32 ... Lighting circuit 4 ... Lens 41 ... Wide-angle lens cut 42 ... Narrow Corner lens cut

Claims (1)

[Claims] 1. In a vehicle LED lighting device in which an LED is used as a light source and light control is performed, the lens of the vehicle LED lighting device has a wide-angle lens cut with a relatively wide diffusion angle and a relatively wide diffusion angle. Narrow narrow angle lens cuts are alternately applied, low illuminance LEDs are arranged corresponding to the wide angle lens cuts, and high illuminance LEDs are arranged corresponding to the narrow angle lens cuts. When dimming the LED lamp as low illuminance, only the LED for low illuminance is turned on, and when dimming as high illuminance, both the LED for low illuminance and the LED for high illuminance are turned on. LED lighting for vehicles.