JP4582803B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a configuration of a vehicular lamp that can quickly remove fogging of a front lens and adhesion of ice and snow.

  FIG. 3 shows an example of the configuration of a conventional vehicular lamp 90 provided with this type of front lens fogging prevention function. A water conduit 92 surrounds the front lens 91 around the front lens 91. The connecting pipes 93 a and 93 b are provided at both ends of the water guide pipe 92 and are drawn out to the side surface of the vehicular lamp 90.

Then, hot water from a radiator (not shown) is connected to the connecting portions 93a and 93b, and the cooling water heated by the radiator is circulated in the water guide pipe 92, and thus is generated in the front lens 91 during cold weather. Some of them are cloudy or snow melting on the front lens 91 during snowfall.
JP 2000-348521 A

  However, in the conventional direction described above, first, the cooling water of the radiator is used for room heating as well, but the engine start-up is also understood so that it can be understood how to heat the room at that time. It takes a considerable amount of time for the room to warm up from the time when the operation is performed. Therefore, when the system is started in cold weather, the front lens is not expected to have a quick effect as a fogging prevention function. .

  In addition, since vibrations and impacts generated during the traveling of the vehicle are considerably large, if the connection between the radiator and the connecting portions 93a and 93b is not secured, it will be detached during the traveling and may leak water. The possibility of becoming a factor of arises. Further, by connecting the radiator and the connecting portions 93a and 93b in this way, the work process is increased even when the vehicular lamp 90 is replaced, and there is a problem that the maintenance of the vehicle becomes complicated.

  The present invention provides a vehicular lamp using a semiconductor light emitting element as a light source as a specific means for solving the problems that occur in the conventional vehicular lamp having such a configuration as described above. Provided is a vehicular lamp characterized in that one of heat conduction plates is connected in the vicinity of the arranged base, and the other of the heat conduction plates is in contact with a portion of the front lens that is not involved in the light distribution formation. Thus, by adopting the semiconductor element, the configuration in which the heat generated by the vehicular lamp itself is guided to the front lens is used to solve the problem by eliminating the need to supply heat from other parts such as a radiator.

  According to the present invention, the heat generated from the semiconductor light emitting element used as the light source is supplied to the necessary part of the front lens and heated, so that the heat of the surplus part is moved to the necessary part in the vehicle lamp. As a self-contained purpose, it is not necessary to supply heat from the outside, thereby eliminating the need for mechanical connection with a heat source such as a radiator, improving the reliability of the vehicle lamp, It has the excellent effect of simplifying maintenance.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure.

  FIG. 1 shows a first embodiment of a vehicular lamp 1 according to the present invention. In the first embodiment, the vehicular lamp 1 is an example when formed as a projector type. In the housing 2 of the vehicular lamp 1, an elliptical reflecting surface 31 having only an upper half is provided, and the light emitting direction is set at the position of the first focal point f1 on the elliptical reflecting surface 31. A semiconductor light emitting element 4 facing upward is arranged.

  Thus, when a lighting current is applied, most of the light emitted from the semiconductor light emitting element 4 reaches the elliptical reflecting surface 31 and is reflected, and the reflected light is reflected by the elliptical reflecting surface 31. The second focal point f2 converges. Here, since the elliptical reflecting surface 31 is provided with only the upper half portion as described above, the traveling direction of the light after converging on the second focal point f2 is from horizontal to downward, It does not contain upward light.

  Therefore, if light is projected in the irradiation direction by the projection lens 5 having a focal point in the vicinity of the second focal point f2, a passing light distribution that basically does not include upward light can be obtained. However, when it is necessary to obtain a more accurate passing light distribution, it is possible to provide the shielding plate 6 at the focal position of the projection lens 5.

  Here, in the present invention, heat generated from the semiconductor light emitting element 4 during lighting is divided and conducted in two directions, and the semiconductor light emitting element 4 is placed as a first direction, Conduction is performed through the heat sink 7 whose end 7a is exposed to the outside of the housing 2, and heat is radiated to the outside air.

  Further, as the second direction, for example, the semiconductor light emitting element 4 of the heat sink 7 is placed on one end 8a of the heat conducting plate 8 formed of a member having excellent heat conduction such as copper or aluminum. The heat sink 7 is also joined to a place where the heat sink 7 is relatively hot, and the other end 8b is connected to a portion such as the frame 9a of the front lens 9 that is not involved in the light distribution formation.

  At this time, since the connection between the heat sink 7 and the heat conducting plate 8 is metal, various methods such as screwing and welding can be adopted. However, the heat conducting plate 8 and the front lens 9 Since the front lens 9 is an exterior part of a vehicle, it is not preferable to employ a joining method that impairs the appearance, such as the appearance.

  Therefore, in the present invention, as an example, a silicon gel 8c having excellent thermal conductivity is applied between the thermal conductive plate 8 and the front lens 9, so that the contact between the two is reliably performed. The thermal conductivity from the heat conductive plate 8 to the front lens 9 is improved.

  In addition, sufficient contact area between the heat conductive plate 8 and the front lens 9 is sufficient due to the necessary and sufficient contact area to conduct the necessary heat, and the spring property on which the heat conductive plate 8 is formed, for example. Is obtained, the above-described application of the silicon gel 8c may be omitted.

  In addition, what is indicated by reference numeral 8d in FIG. 1 is a heat insulating member that covers a portion of the heat conductive plate 8 that is exclusively responsible for the heat conductive portion, for example, with a resin member or the like. The loss of the amount of heat that can be conducted to 9 is reduced, and the efficiency of the intended function such as the antifogging effect of the front lens 9 is improved.

  FIG. 2 shows a second embodiment of the present invention. In this second embodiment, the semiconductor light emitting element 4 and the parabolic reflecting surface 32 are attached below the heat sink 7. The semiconductor light emitting element 4 is appropriately attached to the rear of the focal point f of the parabolic reflecting surface 32.

  By doing so, the traveling direction of the light from the semiconductor light emitting element 4 reflected on the parabolic reflection surface 32 is only from the horizontal to the downward direction, does not include any upward light, and is suitable for passing light distribution. It will be a thing. If necessary, the focal point f of the parabolic reflecting surface 32 and the semiconductor light-emitting element 4 can be matched and used for traveling light distribution as irradiating horizontal light forward.

  Further, in combination with the vehicular lamp 1 of the first embodiment, when only the vehicular lamp of the first embodiment is lit, the light distribution is passed, and only the vehicular lamp of the second embodiment is lit. Or, when the first and second vehicular lamps are turned on at the same time, a traveling light distribution may be obtained.

  In the second embodiment, a heat conduction plate 8 made of a bonded metal that is bent by heat, such as bimetal, is attached to the upper surface of the heat sink 7. The heat conduction plate 8 is attached to the heat sink 7. The opposite end to the front lens 9 is in contact with the front lens 9.

  At this time, for example, the shape on the side in contact with the front lens 9 is processed in advance so as to have a linear shape at a low temperature and an arc shape at a high temperature. If the entire surface is in contact with the front lens 9, the contact area decreases as the ambient temperature rises, and heat transmitted to the front lens 9 can be reduced when there is no possibility of fogging the front lens 9 such as in summer. be able to.

  Here, considering the heating of the front lens 9, the temperature of the front lens 9 is increased, that is, the temperature in the housing 2 is increased, and the temperature of the semiconductor light emitting element 4 is increased. It will also cause fear of affecting. This is presumed that there is little influence on the semiconductor light emitting element 4 in the winter when the outside air temperature is low, but it is expected that the influence on the semiconductor light emitting element 4 is increased in the summer when the outside air temperature is high.

  Therefore, in the second embodiment, the front lens 9 is likely to be fogged and the temperature of the front light lens 9 is increased in winter when the temperature rise of the semiconductor light-emitting element 4 is sufficient to improve the anti-fogging effect. 9, in the summer when the possibility of clouding is low, the semiconductor light emitting element 4 is focused on cooling.

  In addition, according to the present invention, since a heat source is not obtained in addition to a radiator or the like, for example, it is not necessary to take time to become usable, such as a time until the cooling water reaches a usable temperature, No additional work such as attachment / detachment of the water conduit is required for the replacement of the vehicular lamp 1, and the maintenance work can be simplified.

It is explanatory drawing which shows the 1st Example of the vehicle lamp which concerns on this invention. It is explanatory drawing which shows the 2nd Example of the vehicle lamp which concerns on this invention. It is a perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Housing 31 ... Elliptic reflection surface 32 ... Parabolic reflection surface 4 ... Semiconductor light emitting element 5 ... Projection lens 6 ... Shielding plate 7 ... Heat sink 8 ... Thermal conduction plate 8a ... One end 8b ... The other end 8c ... Silicon gel 8d ... Heat insulation member 9 ... Front lens

Claims (5)

  A vehicular lamp using a semiconductor light emitting element as a light source, one of the heat conducting plates is connected in the vicinity of the heat sink where the semiconductor light emitting elements are arranged, and the other of the heat conducting plates is used for the light distribution formation of the front lens. A vehicular lamp characterized by being in contact with a non-participating part.   The contact of the said heat conductive board and the part which does not participate in the light distribution formation of the said front lens is performed through the member which is excellent in heat conductivity and has a softness | flexibility. Vehicle lamp.   3. The vehicular lamp according to claim 1, wherein a member having a spring property is employed for the heat conducting plate, and is pressed against the front lens by a spring property.   The vehicular lamp according to any one of claims 1 to 3, wherein a part or all of the heat conduction plate except a portion in contact with the front lens is covered with a heat insulating material.   The vehicle according to any one of claims 1 to 4, wherein bimetal is used for the whole or part of the heat conducting plate, and the amount of heat conduction to the front lens changes according to the ambient temperature. Lamps.

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