JP2012155962A - Vehicular lamp tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lamp tool capable of preventing cloudiness of an outer lens in a simple structure without bringing forth cost hike.SOLUTION: In a headlamp (vehicular lamp) 1 including a plurality of lamp units 5 to 7 accommodated in a lamp chamber 4 defined by a housing 2 and an outer lens 3 covering its opening, a space S1 is defined by an extension 16, an inner lens 17 covering its opening, and the housing 2 in the lamp chamber 4. A bulb (light source) 12 and a reflector 15 constructing the lamp unit 7 are accommodated in the space S1, and a vent hole 18 opening to the space S2 formed at a back side of the reflector 15 against the housing 2 is formed in the housing 2.

Description

  The present invention relates to a vehicular lamp in which a plurality of lamp units are housed in a lamp chamber defined by a housing and an outer lens covering an opening of the housing.

  For example, the headlamps arranged on the left and right of the front end of the vehicle have a lamp unit for high beam (for traveling beam) and a lamp unit for low beam (for passing beam) in a lamp chamber defined by an outer lens that covers the housing and its opening. A combination type unit that accommodates various lamp units such as a turn lamp unit and a position lamp unit is used.

  By the way, in such a combination type headlamp, when high-temperature air heated by heat generated by lighting of each lamp unit stays in the upper corner of the lamp chamber, and the staying air is cooled when the lamp is turned off. There is a problem that the moisture contained therein is condensed on the inner surface of the outer lens and the outer lens becomes cloudy.

  Therefore, Patent Document 1 proposes a configuration in which condensation is prevented by filling a transparent gel-like buffer member between the inner lens inner surface and a component member such as an inner lens adjacent thereto.

JP 2001-332117 A

  However, in the configuration proposed in Patent Document 1, a gel-like buffer member is required separately, and it is necessary to fill the buffer member between the inner surface of the outer lens and the component member. In short, there is a problem that the cost cannot be avoided.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular lamp that can prevent fogging of the outer lens with a simple configuration without increasing the cost.

  In order to achieve the above object, the present invention provides a vehicular lamp including a plurality of lamp units housed in a lamp chamber defined by a housing and an outer lens that covers the opening, and the extension and the opening in the lamp chamber. A space defined by the inner lens and the housing is formed, and a light source and a reflector constituting one of the lamp units are accommodated in the space, and between the housing on the back side of the reflector. The housing is formed with a vent hole that opens into the space to be formed.

  According to the present invention, the volume of the space defined by the extension, the inner lens that covers the opening of the lamp chamber, and the housing is smaller than the volume of the lamp chamber, and is generated by the lighting of the light source accommodated in the lamp chamber. The air in the space becomes high temperature in a short time due to the heat that is generated, but since this high temperature air does not flow out to the outer lens side, dew condensation occurs on the inner surface of the outer lens even if this high temperature air is rapidly cooled when turned off The fogging of the outer lens is reliably prevented. Further, since the high-temperature air in the space with a small volume is discharged to the outside from the vent hole of the housing through the space formed between the rear surface of the reflector and the housing, the inner surface of the inner lens that defines the space This prevents the occurrence of a problem that condensation forms on the inner lens and the inner lens becomes cloudy.

1 is a front view of a vehicular lamp according to the present invention. 1 is a perspective view of a vehicular lamp according to the present invention. It is a rear view of the vehicle lamp which concerns on this invention. It is the sectional view on the AA line of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a headlamp as an embodiment of a vehicular lamp according to the present invention, FIG. 2 is a perspective view of the headlamp, FIG. 3 is a rear view of the headlamp, and FIG. 4 is AA in FIG. It is line sectional drawing.

  The headlamp 1 according to the present embodiment is provided on the left and right of a vehicle front end (not shown), and is defined by an outer lens 3 that covers the housing 2 and its front opening as shown in FIG. In the lamp chamber 4, a high beam (running beam) lamp unit 5, a low beam (passing beam) lamp unit 6, a turn lamp unit 7 and a position lamp unit 8 are accommodated. The illustrated headlamp 1 is disposed at the left end of the vehicle, and the headlamp disposed at the left end is configured symmetrically, and the basic configuration is the same on the left and right. Hereinafter, illustration and description thereof will be omitted.

  As shown in FIG. 4, the housing 2 is integrally formed of resin, and a fitting recess 2a having a U-shaped cross section is formed at the periphery of the front opening. Further, the outer lens 3 is integrally formed of a transparent resin, and a convex portion 3a that protrudes integrally toward the rear of the vehicle is fitted into the fitting concave portion 2a of the housing 2 from the front of the vehicle. The outer lens 3 is bonded and integrated with the housing 2 by being bonded by hot melt 9.

  The high beam lamp unit 5, the low beam lamp unit 6 and the turn lamp unit 7 use bulbs 10, 11 and 12 as light sources, respectively, and these are arranged side by side. Here, in the high beam lamp unit 5 and the low beam lamp unit 6, the bulbs 10 and 11 are respectively inserted into the central portions of the reflectors 13 and 14 from the rear of the vehicle and are detachably supported. The valve 12 is inserted into the reflector 15 from the side of the vehicle and is detachably supported. And the clearance gap between the housing 2, the reflectors 13-15, and the reflectors 13-15 is covered with the extension 16 made from resin.

  As shown in FIG. 1, the position lamp unit 8 is disposed above the low beam lamp unit 6, and a plurality of LEDs (light emitting diodes) (not shown) are arranged in the horizontal direction as light sources. .

  Thus, in the headlamp 1 according to the present embodiment, as shown in FIG. 4, an extension 16 and a transparent inner lens 17 covering the opening and the housing 2 are provided on the side of the lamp chamber 4. A space S1 is defined, and the bulb 12 that is a light source of the turn lamp unit 7 and the reflector 15 that reflects the light toward the front of the vehicle are accommodated in the space S1. In the lamp chamber 4, another space S <b> 2 is formed between the reflector 15 and the housing 2, and a vent hole 18 formed in the back surface of the housing 2 is opened in the space S <b> 2. ing. As shown in FIG. 3, vent holes 19 and 20 are formed on the back surface of the housing 2 to allow the lamp chamber 4 to communicate with the outside. The vent holes 19 and 20 and the vent hole 18 are formed in the vent holes 18. Drain tubes 21 are connected to each other.

  As described above, in the headlamp 1 according to the present embodiment, the space 16 having a small volume is formed in the lamp chamber 4 by the extension 16, the inner lens 17 that covers the opening thereof, and the housing 2. The bulb 12 and the reflector 15 of the turn lamp unit 7 were accommodated. The headlamp 1 usually uses a low beam lamp unit 6 in many cases. For this reason, a lot of heat is generated by lighting the low beam lamp unit 11. The air in the lamp chamber 4 is warmed by the heat generated by the bulb 11 to cause convection. When the outside air having a low temperature including moisture enters from the vent hole 18 provided in the vicinity of the space S <b> 1 by this convection, the outside air flows into the lamp chamber 4. At this time, in the headlamp 1 according to the present embodiment, the flow path from the vent 18 toward the lamp chamber 4 is divided by the space S1 and the space S2.

  Further, since the volume in the lamp chamber 4 is reduced by the volume of the space S1 and the space S2, the cold air containing moisture is prevented from flowing into the inner surface of the outer lens 3 while being cooled, and the valve 11 The volume of the lamp chamber 4 heated by the heat generated by lighting is reduced, and the time for heating the lamp chamber 4 is shortened. Therefore, condensation is less likely to occur on the inner surface of the outer lens 3 facing the lamp chamber 4.

  In addition, when highly humid air flows into the space S1 having a small volume from the vent hole 18 and the temperature of the valve 12 increases due to heat generated by the lighting of the bulb 12, the bulb 12 is turned off. Even when the high-temperature air is cooled, the high-humidity air does not flow out to the outer lens 3 side, so that condensation does not occur on the inner surface of the outer lens 3 and the outer lens 3 is reliably prevented from being fogged. . In particular, the outer lens 3 is opposed to the front of the ventilation hole 18 (the lower side in FIG. 4) via an opaque extension 16. The space S1 is not directly introduced into the outer lens 3 by being separated by the inner lens 17 attached to the extension 16.

  Further, since the high-temperature air in the small volume space S1 is discharged to the outside from the vent hole 18 of the housing 2 through the space S2 formed between the reflector 15 and the housing 2 on the back side, the space S1 is discharged. It is possible to prevent a problem that condensation occurs on the inner surface of the defining inner lens 17 and the inner lens 17 becomes cloudy. In addition, since the low temperature outside air is introduced into the lamp chamber 4 from the vent holes 19 and 20 formed in the housing 2, the lamp chamber 4 is sufficiently ventilated and the outer lens 3 facing the lamp chamber 4. The inner surface is not fogged by condensation.

  Although the present invention has been described with respect to a form in which the present invention is applied to a headlamp, the present invention is naturally applicable to other vehicle lamps such as a rear combination lamp.

1 Headlamp (vehicle lamp)
DESCRIPTION OF SYMBOLS 2 Housing 2a Housing fitting recessed part 3 Outer lens 3a Outer lens convex part 4 Lamp chamber 5 High beam lamp unit 6 Low beam lamp unit 7 Turn lamp unit 8 Position lamp unit 9 Hot melt 10-12 Bulb 13-15 Reflector 16 Extension 17 Inner lens 18-20 Vent 21 Drain tube S1, S2 Space

Claims (1)

In a vehicular lamp comprising a plurality of lamp units housed in a lamp chamber defined by an outer lens covering a housing and an opening thereof,
A space defined by the extension and an inner lens covering the opening and the housing is formed in the lamp chamber, and a light source and a reflector constituting one of the lamp units are accommodated in the space. A vehicular lamp characterized in that a vent hole that opens in a space formed between the housing and the rear side is formed in the housing.

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