JP3222171B2 - Combined headlights for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headlight for a vehicle, and more particularly, to a headlight, a fog light, a vehicle width light or a direction indicator, in which a plurality of lamps are arranged behind a single lens. The present invention relates to a headlight having a configuration as described above.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the configuration of a conventional composite headlamp 90 of this type. A fog lamp lamp 92 having a fog light source 92a is provided on the back surface of a lens 91 formed as one surface. A traveling beam headlight lamp 93 having a traveling light source 93a, a passing beam headlight lamp 94 having a passing light source 94a, and a width lamp 95 having a vehicle width light source 95a are arranged, and respective lamps 92 to 95 are arranged. Is selected and turned on depending on the driving conditions of the vehicle, and in most of the normal use conditions, the passing beam headlight lamp 94 and the vehicle width lamp 95 are turned on. Has become something.

[0003]

However, since the composite headlamp 90 is configured to share the above-described lens 91 on one side, for example, after the lighting of the low-beam headlamp lamp 94 is started, the low-passing headlamp 94 starts passing. The moisture adsorbed inside the composite headlamp 90 evaporates due to the heat generated by the light source 94a, and the humidity inside the composite headlamp 90 rises, and
Is in contact with the air of relatively high humidity.

[0004] When running starts in this state, the lens 91 receives uniform cooling air over its entire surface and its temperature decreases. However, the portion receiving radiant heat from the passing light source 94a has a low rate of temperature decrease and a high temperature. Is maintained, so that a temperature difference is generated on the back surface of the lens 91, and the lighting is not performed.
2. Dew condensation occurs on the rear surface of the lens 91 which is the front of the vehicle width lamp 95 with a small amount of radiant heat even if the traveling beam headlight lamp 93 and the lighting is performed, and the surface of the lens 91 becomes cloudy. There is a problem that the quality of the headlight 90 is impaired, and the solution of this problem has been an issue.

[0005]

SUMMARY OF THE INVENTION The present invention is, as a specific means for solving the above-mentioned conventional problems, as a vehicle front composite comprising a plurality of lamps each having a light source on the back of a single lens. In an illuminator, the lenses are thin at high temperature and high frequency, and thick at low temperature and low frequency according to the amount of heat radiated from each light source and the frequency of use of each light source. The object of the present invention is to solve the problem by providing a composite headlamp for a vehicle characterized in that the thickness is adjusted as described above so that partial dew condensation does not occur.

[0006]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 shows a composite headlamp according to the present invention. The composite headlamp 1 includes a fog lamp lamp 3 having a fog light source 3a and a traveling light source 4a on the back surface of a lens 2. A plurality of lamps such as a traveling beam headlamp lamp 4, a passing beam headlamp lamp 5 having a passing light source 5a, and a vehicle width lamp 6 having a vehicle width light source 6a are arranged. This is the same as that of the conventional example.

However, according to the present invention, the lens 2 is designed so that the amount of radiant heat received from the light sources 3a to 6a of the lamps 3 to 6 and the frequency of use of the lamps 3 to 6 are considered. The thicknesses of the corresponding portions 3 to 6 are different from each other, and the rear surface of the lens 2 is made to have a uniform temperature by the cooling action on the surface of the lens 2 by the cooling wind accompanying the traveling of the automobile. .

In the following, the above configuration will be described in more detail by way of a specific example. In general, the power consumption of the light source in this type of composite headlamp 1 is roughly as follows: traveling light source 4a> passing light source 5a> fog Light source 3a> vehicle width light source 6a, and the frequency of use is substantially the same, vehicle width light source 6a> passing light source 5a> fog light source 3a> running light source 4a
It becomes the order of.

Here, in the present invention, basically, the temperature rise due to the radiant heat from the respective light sources 3a to 6a is reduced by the cooling air by reducing the thickness of the lens 2, and the rear surface of the lens 2 is cooled. In order to prevent the occurrence of partial dew condensation by making the temperature of the headlight uniform, in addition to this, the use conditions of this type of composite headlamp 1 are also taken into consideration so as to match the reality.

That is, in an actual use state, as described above, almost all of the night driving is performed by turning on the low beam headlamp lamp 5, whereby the traveling light source 4a
Is extremely rarely lit. Therefore, in the present invention, although the power consumption of the traveling light source 4a is large and the effect of increasing the temperature by applying radiant heat to the rear surface of the lens 2 is recognized, the traveling light source 4a, The thickness of the lens 2 at the portion corresponding to the traveling beam headlight lamp 4 is set to be large.

On the other hand, in the part of the lens 2 corresponding to the width lamp 6, although the width lamp 6 is used frequently as described above,
Since the vehicle width light source 6a has a small power and does not give rise to a large amount of radiant heat on the rear surface of the lens 2 to raise the temperature, the thickness of the lens 2 corresponding to this portion is also relatively thick. Have been.

Next, the operation and effect of the present invention having the above configuration will be described. The thickness of the lens 2 is the same as the amount of radiant heat generated by each of the light sources 3a to 6a.
Adjustment is made based on the frequency of use of a to 6a. Under actual use conditions, the temperature on the back surface of the lens 2 is made uniform, so that partial dew condensation does not occur.

Even if dew condensation occurs in this state, the temperature on the back surface of the lens 2 is made uniform, so that dew condensation is generated uniformly on the entire back surface of the lens 2. Water in the composite headlight 1
Is dispersed over the entire surface of the surface of the substrate, resulting in extremely slight dew condensation, which does not result in dew condensation concentrated in a part as in the conventional example, and can be substantially within a negligible range.

FIGS. 2 and 3 show another embodiment of the present invention. In the previous embodiment, the thickness of the lens 2 was substantially reduced.
In this embodiment, the lens 20 is first mounted on the composite headlamp 1 as shown in FIG. 2, and is adjusted based on the conditions described previously. The light source is turned on to measure the temperature distribution on the back surface of the lens 20 to obtain an isothermal curve T.
And the position where the temperature is lowest is continuously changed so as to become the thickest portion max. By doing so, conditions such as temperature difference due to convection of air in the composite headlamp 1 are obtained. Can be included, and a further effect is achieved in achieving the above-described object.

According to the results of trial manufacture and examination by the inventor for realizing the present invention, it is found that, in this type of compound headlamp 1 of this type employed in a normal passenger car, when a resin lens is selected as the lens 2, The thickness of the lens 2 is 2 to 6
It has been confirmed that setting a range of mm gives a good result. Further, in actual implementation, it has been confirmed that a good result can be similarly obtained with the combination headlight 1 other than the combination described above.

[0016]

As described above, according to the present invention, the lens is thin at high temperature and high frequency of use and low at low temperature depending on the amount of heat radiated from each light source and the frequency of use of each light source. And by using a composite headlamp for vehicles whose thickness is adjusted to be thicker in parts that are used less frequently, the temperature on the back of the lens is made uniform, and as a result, partial condensation does not occur This prevents the viewer from feeling uncomfortable in spoiling the sense of quality, thereby achieving an extremely excellent effect in improving the quality of this type of vehicle composite headlamp.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a composite headlamp for a vehicle according to the present invention.

FIG. 2 is an explanatory view showing a forming method according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a main part of another embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Composite headlight 2, 20 ... Lens 3 ... Fog lamp light 3a ... Fog light source 4 ... Traveling beam headlight 4a ... Traveling light source 5 ... Passing beam headlight 5a ... … Light source for passing 6 …… Light fixture for vehicle width 6a …… Light source for vehicle width

Claims (1)

(57) [Claims] 1. A composite headlamp for a vehicle in which a plurality of lamps each having a light source are disposed on a back surface of a single lens, wherein the lens has a heat amount radiated from each of the light sources and a quantity of heat of each of the light sources. A composite headlamp for a vehicle, wherein the thickness is adjusted so as to be thinner in a high-temperature and frequently used part and to be thick in a low-temperature and less frequently used part in accordance with the frequency of use.