JP2012048896A - Vehicular lamp fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a DRL light source unit which does not have luminance unevenness or luminance variation at high luminance by preventing influence of heating from a light source unit for a low beam and/or a light source unit for a traveling beam, in a vehicular lamp fitting having the light source unit for a low beam and/or the light source unit for a travelling beam, and the DRL light source unit using an LED as a light source, in a lamp chamber.SOLUTION: A flat metal heat-shielding plate 43 is located at a lowermost section of the DRL light source unit 30, and the metal heat-shielding plate 43 is arranged with a gap 42 of a designated distance between itself and formed members along the formed members of the opposed DRL light source unit. Thus, heat generation from the light source unit 10 for a low beam and the light source unit 20 for a traveling beam arranged under the DRL light source unit 30 is radiated backward and upward along both sides of the metal heat-shielding plate 43.

Description

  The present invention relates to a vehicular lamp, and more particularly, to a vehicular lamp including a DRL light source unit that uses a semiconductor light emitting element as a light source.

  In recent years, it has been called DRL (Daytime Running Lamp) in four-wheeled vehicles, and in order to urge pedestrians or oncoming vehicles to call attention during daytime driving, there is a demand for mounting a lamp that is always lit. .

  Conventionally, a vehicle lamp having a DRL light source unit having a DRL function of this type has been disclosed as a third embodiment of Patent Document 1 as shown in FIG.

  The disclosed vehicular lamp 80 includes a lamp body 84 housed in a lamp chamber 83 formed by a lamp housing 81 and a front cover 82, and the lamp body 84 includes a first light source 85 that forms a high beam or a low beam. A pair of second light sources 86 that perform the DRL function are provided.

  Among them, the first light source 85 is composed of a halogen lamp or a discharge lamp, and is attached to the rear end portion of the elliptical reflector 87 and is surrounded by the reflector 87. A cylindrical lens holder 88 is assembled at the front end portion of the reflector 87, and a transparent flat plate 89 is disposed at the front end portion of the lens holder 88.

  On the other hand, the second light source 86 has a light emitting source as a semiconductor light emitting element (LED element), and a substrate 90 on which the second light source 86 is mounted is fixed to a second light source mounting portion 91 of a lens holder 88 (for example, Patent Document 1). reference.).

JP 2010-67560 A

  By the way, the LED element that is the light source of the second light source 86 that fulfills the DRL function has a shortened light emission lifetime and a large decrease in light emission efficiency due to a temperature rise due to self-heating during lighting. As a result, there is a possibility that the reliability is lowered and the amount of light emitted from the lamp is reduced so that the DRL function cannot be sufficiently achieved.

  From this point of view, when the vehicle lamp of Patent Document 1 is seen, when the LED element of the second light source 86 is turned on, the heat in the space surrounded by the lens holder 88 and the reflector 87 is heated, and the space is heated. The temperature of the LED element located in the second light source mounting portion 91 of the lens holder 88 rises due to the warm air.

  Then, the LED element of the second light source 86 has a remarkable increase in the temperature of the LED element itself due to the synergistic effect of the self-heating when the LED element is turned on and the heat generation when the first light source 85 is turned on. As the light emission lifetime is shortened, the light emission efficiency is greatly reduced. As a result, there is a possibility that the reliability is lowered and the amount of light emitted from the lamp is reduced so that the DRL function cannot be sufficiently achieved.

  Further, the temperature distribution of the warm air confined in the space surrounded by the lens holder 88 and the reflector 87 is higher in the upper portion and lower in the lower portion due to the rising air flow. Therefore, even in the second light source 86 arranged in an annular shape, the temperature rise increases because the second light source 86 positioned on the upper side is exposed to higher warm air than the second light source 86 positioned on the lower side.

  As a result, the LED element of the light emitting source has a temperature rise that varies depending on the arrangement position of the second light source 86, resulting in non-uniform luminous efficiency and a DRL optical unit with uneven brightness.

  Accordingly, the present invention was devised in view of the above problems, and an object of the present invention is to use a semiconductor light emitting element as a light source in a lamp chamber together with a light source unit for a passing beam and / or a light source unit for a traveling beam. In a vehicular lamp equipped with a DRL light source unit, a DRL light source unit having high luminance and no luminance unevenness or luminance variation is obtained by preventing the influence of heat generation from the low beam light source unit and / or the traveling beam light source unit. It is to be realized.

  In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is provided in a lamp chamber comprising at least a housing having a front end opening and a closed space formed by a lens attached to the front end opening of the housing. A vehicle lamp comprising a DRL light source unit having a semiconductor light emitting element as a light source together with a low beam light source unit and / or a traveling beam light source unit, wherein the DRL light source unit is the low beam light source unit. And / or a plate-shaped metal heat shield plate located at the bottom of the light source unit for the traveling beam and facing the heat shield plate along the constituent members of the DRL light source unit. It is characterized by being arranged with a gap of a predetermined distance between the members.

  Moreover, the invention described in claim 2 of the present invention is that in claim 1, the heat shield plate is bent upward on the rear end side to form a bent portion, and the bent portion is It is located at the rearmost part of the DRL light source unit.

  Moreover, the invention described in claim 3 of the present invention is that, in claim 2, the constituent member of the DRL light source unit facing the heat shield plate is bent upward on the rear end side. A bent portion is formed, and the bent portion of the heat shield plate is located behind the bent portion of the component member.

  In the vehicle lamp of the present invention, a DRL light source unit having a semiconductor light emitting element as a light source is positioned above a low beam light source unit and / or a traveling beam light source unit housed in a lamp chamber, and the DRL light source The unit has a flat metal heat shield located at the bottom and a gap of a predetermined distance along the component of the DRL light source unit facing the heat shield. Are arranged.

  As a result, the heat generated from the light source unit for the passing beam and / or the light source unit for the traveling beam flows along the surface of the heat shield plate facing the component of the light source unit for the DRL and the gap, and rearward and upward. Dissipated.

  As a result, it is possible to suppress the influence of heat generation from the low beam light source unit and / or the traveling beam light source unit on the DRL light source unit, and all the semiconductor light emitting elements emit light with high luminance and little luminance difference. For this reason, a light source unit for DRL that has high luminance and little luminance variation can be realized.

It is a longitudinal cross-sectional explanatory drawing of the vehicle lamp concerning embodiment. It is the elements on larger scale of FIG. It is a perspective explanatory view when the vehicular lamp according to the embodiment is viewed from the front. It is a perspective explanatory view when the vehicular lamp concerning an embodiment is seen from back. It is internal structure explanatory drawing of embodiment. It is explanatory drawing of the heat transfer path concerning embodiment. It is explanatory drawing of a prior art example.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6 (the same parts are denoted by the same reference numerals). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

  1 is a longitudinal sectional view of a vehicular lamp (hereinafter abbreviated as “lamp”) provided with a DRL light source unit of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 4 is a perspective explanatory view when the lamp is viewed from the rear, and FIG. 5 is an internal configuration explanatory view of the DRL light source unit.

  3 and 4 are perspective views illustrating the state of a light source unit such as a DRL light source unit housed in the lamp chamber by removing the housing and the front lens that form the lamp chamber.

  As shown in FIG. 1, the lamp 1 includes a housing 2 whose front and rear ends are open, a maintenance cap 3 for replacing a light source attached to the rear end opening of the housing 2, and a through-hole attached to the front end opening of the housing 2. The front lens 4 forms a lamp chamber 5 composed of a closed space, and a light source unit 10 for passing beam, a light source unit 20 for traveling beam, and a light source unit 30 for DRL are accommodated in the lamp chamber 5.

  1, 3, and 4, the low-beam light source unit 10 includes a discharge bulb 11 that serves as a light source, a shade 12 that is disposed so as to cover the tip of the discharge bulb 11, and the discharge bulb 11 and the shade 12. The reflector 13 having a multi-reflecting surface composed of a plurality of reflecting surfaces, which is arranged so as to surround the reflector, is integrated, and the multi-reflecting surface of the reflector 13 is emitted from the discharge bulb 11. The reflected light reflected by the light beam generates a light distribution characteristic for a passing beam, and is transmitted forward through a transparent front lens 4 disposed on the front surface.

  On the other hand, the traveling beam light source unit 20 is integrated with a halogen bulb 14 serving as a light source and a reflector 15 having a multi-reflecting surface composed of a plurality of reflecting surfaces arranged so as to surround the halogen bulb 14. The reflected light emitted from the halogen bulb 14 and reflected by the multi-reflecting surface of the reflector 15 generates a light distribution characteristic for a traveling beam, and is transmitted through a plain front lens 4 disposed on the front surface. Then it is irradiated forward.

  The low beam light source unit 10 and the traveling beam light source unit 20 are juxtaposed in the vehicle compartment in the vehicle width direction in the lamp chamber 5, and the DRL light source unit 30 is disposed above the light beam unit 10. Yes. Each of the passing beam light source unit 10 and the traveling beam light source unit 20 has a structure generally known as a light source unit constituting a lamp.

  The DRL light source unit 30 is disposed in the upper part of the lamp chamber 5 so that an oncoming vehicle or a pedestrian can reliably recognize the approach of the vehicle. In the present embodiment, the DRL light source unit is provided in parallel. 10 and the traveling beam light source unit 20.

  Hereinafter, the structure of the DRL light source unit 30 will be described in detail with reference to FIGS. The DRL light source unit 30 includes a plurality of (six in the present embodiment) light sources 31, and each light source 31 uses a semiconductor light emitting element (specifically, for example, an LED element) as a light source and uses the LED element. It is packaged in an appropriate shape by a sealing material.

  Each light source 31 is mounted on an independent circuit board 32 together with a connector 33, and the connectors 33 of adjacent circuit boards 32 are connected to each other by a cable 34. As a result, the power supplied from the external power source is transmitted to each connector 33 through the cable 34, and is supplied from each connector 33 to the light source 31 through the circuit pattern of the circuit board 32, so that the light source 31 is turned on.

The circuit board 32 is a substrate (resin substrate) made of a resin material such as glass epoxy resin, a substrate (metal substrate) made of a metal material such as aluminum (Al), alumina (Al ₂ O ₃ ), or aluminum nitride (AlN). Any one of substrates made of a ceramic material such as silicon carbide (SiC) (ceramic substrate) is used.

  The circuit board 32 on which the light source 31 and the connector 33 are mounted is fixed to each step portion 35a of the step-like inner lens 35 having a step portion 35a and a step portion 35b via a spacer 36.

  When the circuit board 32 is a metal substrate, the single circuit board 32 can be formed in a staircase shape like the inner lens 35. In this case, the connection cable 34 for connecting the independent circuit boards 32 as described above becomes unnecessary.

  Each step portion 35 a of the inner lens 35 is formed with a convex condensing lens portion 35 c on the light source 31 side that shares the optical axis with the optical axis of the light source 31 at a position corresponding to the light source 31. In addition, even if the condensing lens part 35c is a Fresnel lens, it can fulfill | perform a condensing function.

  On the opposite side of the step-like inner lens 35 from the side where the circuit board 32 is located, a step-like decorative panel 37 having a step portion 37 a and a step portion 37 b is disposed along the inner lens 35.

  Each step portion 37a of the decorative panel 37 includes a condensing lens portion 35c having a central axis of the optical axis of the condensing lens portion 35c at a position corresponding to the condensing lens portion 35c of each step portion 35a of the inner lens 35. A window hole portion 37c having substantially the same size is provided. Further, a metallic reflective reflection surface is formed on at least the surface opposite to the inner lens 35 of the decorative panel 37 by depositing a metal reflection film such as aluminum.

  As a result, when the inside of the lamp chamber 5 is viewed from the outside through the front lens 4, the internal components such as the circuit board 32 and the connector 33 located behind are not seen, and a good appearance due to the blindfold effect is ensured. The product quality is improved by creating a high-class feeling with a glossy metallic tone.

  The circuit board 32, the inner lens 35, and the decorative panel 37 are integrated to form a light source module 38, and are accommodated in a partition area surrounded by the outer lens 40 and the main body 41.

  The outer lens 40 has a substantially U-shaped cross section, and the front surface portion 40a extending in the vertical direction and serving as the light emission surface of the light emitted from the light source module 38 has the longitudinal direction as the vehicle width direction of the vehicle. It is curved in the longitudinal direction along the staircase-shaped decorative panel 37, and this curve is simultaneously along the front lens 4 of the lamp 1 having a shape that wraps around from the front of the vehicle to the side. Further, in the upper surface portion 40b extending rearward from the upper end portion of the front surface portion 40a, the outer lens 40 is extended from the front surface portion 40a to the rear end portion of the DRL light source unit 30 as it is.

  On the other hand, the lower surface portion 40c extending rearward from the lower end portion of the front surface portion 40a of the outer lens 40 is constituted by a main body 41 from the vicinity of the front surface portion 40a, and the main body 41 projects obliquely downward and rearward in the vicinity of the front surface portion 40a. The hook portion 41b and the extension portion 41a extending rearward are branched, and the extension portion 41a is once bent upward at the rear end portion side of the DRL light source unit 30, and then bent backward again to extend to the rear end portion. It is installed.

  Further, below the main body 41, a flat metal heat shield plate 43 is disposed along the main body 41 with a gap 42 of a predetermined distance between the main body 41 and the heat shield plate 43. The front end portion is positioned in a V-shaped space portion 44 formed by the extension portion 41 a and the hook portion 41 b of the main body 41, and the rear end portion side is bent rearward and upward from the rear end portion of the main body 41. Yes.

  The outer lens 40, the main body 41, and the heat shield plate 43 are integrated with a light source module 38 in which the circuit board 32, the inner lens 35, and the decorative panel 37 are integrated to form the DRL light source unit 30. Yes.

  As described above, the DRL light source unit 30 is disposed above the side-by-side beam light source unit 10 and the traveling beam light source unit 20 which are arranged side by side, and the DRL light source so as to sandwich the DRL light source unit 30 therebetween. Extensions 45 and 46 are arranged above and below the unit 30, respectively. Among them, the extension 46 positioned particularly on the lower side is positioned in front of any upper part of the reflector 13 of the low beam light source unit 10 and the reflector 15 of the traveling beam light source unit 20.

  Therefore, when the six light sources (LED light sources) 31 arranged at predetermined intervals in the vehicle width direction of the DRL light source unit 30 are turned on, the light emitted from each light source 31 is the condenser lens of the inner lens 35. The light is condensed by the portion 35 c, passes through the window hole portion 37 c of the decorative panel 37, and sequentially passes through the outer lens 40 and the front lens 4 positioned on the front surface and is irradiated toward the front of the lamp 1.

  At this time, when the DRL light source unit 30 is viewed from the light irradiation direction, each irradiation light is felt as if it is emitted from the metallic-like bright reflection surface of the decorative panel 37, and it has a high-quality design with excellent design. A certain DRL light source unit 30 can be appealed.

  Further, the DRL light source unit 30 is disposed above the low beam light source unit and / or the traveling beam light source unit housed in the lamp chamber 5 of the lamp 1, so that the visibility to pedestrians or oncoming vehicles can be improved. Thus, it is possible to ensure a favorable driving environment.

  Next, in a state where the light source 31 of the DRL light source unit 30 is turned on, at the same time, either one or both of the discharge bulb 11 of the low beam light source unit 10 and the halogen bulb 14 of the traveling beam light source unit 20 are turned on. The behavior of heat will be described. However, in the following description, for convenience, the state when the discharge bulb 11 of the low beam light source unit 10 is turned on will be described with reference to FIG. 6 (partially enlarged view of a longitudinal section).

  When the discharge bulb 11 is lit, the warm air heated by the heat generated from the discharge bulb 11 rises directly or along the reflector 13 and is between the front end portion of the reflector 13 and the rear end portion of the lower extension 46. Move to the gap 50 located.

  A part of the heat moved to the gap 50 located between the front end portion of the reflector 13 and the rear end portion of the lower extension 46 is moved rearward along the lower surface 43b of the heat shield plate 43, and the heat shield plate. 43 rises and is distributed along a bent portion 43a extending upward. This is defined as a first heat transfer path (A).

  Further, a part is located between the lower surface 41e of the extension portion 41a of the main body 41 and the upper surface 43c of the heat shield plate 43 through a V-shaped space portion 44 formed by the extension portion 41a and the hook portion 41b of the main body 41. A bent portion 41 d that moves rearward through the gap 42, rises along a bent portion 41 c extending upward of the main body 41, and extends rearward of the bent portion 43 a of the heat shield plate 43 and the rear of the main body 41. Ascends through a gap 51 located between the rear end portion and the light source unit 30 for DRL. This is defined as a second heat transfer path (B).

  Further, a part moves forward through the gap 52 located between the lower surface 41f of the hook portion 41b of the main body 41 and the lower surface 40d of the lower surface portion 40c of the outer lens 40 and the upper surface 46a of the lower extension 46, and the extension Ascending from the tip of 46 is dispersed. This is defined as a third heat transfer path (C).

  Then, the heat generated from the discharge bulb 11 is dispersed in the first heat transfer path (A), the second heat transfer path (B), and the third heat transfer path (C), and the heat concentration is concentrated. The temperature rise of the light source unit for DRL which is reduced and located above can be suppressed.

  In any of the heat transfer paths (A), (B), and (C), there is no heat remaining in the vicinity of the DRL light source unit because the heat generated from the discharge bulb 11 is smoothly transferred. Also from this point, the temperature rise of the DRL light source unit can be suppressed.

  As a result, the influence of heat generation from the light source unit for the passing beam and / or the light source unit for the traveling beam can be suppressed, and the LED elements of all the light sources 31 emit light with a high luminance and a small luminance difference. As the light source unit 20, a light source unit with high luminance and less luminance variation is realized.

  Further, the heat dispersed through the third heat transfer path (C) is the light irradiation region of the DRL light source unit 30 that uses the LED element of the front lens 4 of the lamp 1 that does not emit infrared rays (heat rays) as a light source. It is transmitted to the low-temperature part of the lens and effectively contributes to ensuring a good driving environment such as prevention of fogging of the lens surface and melting snow during snowfall.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Housing 3 ... Maintenance cap 4 ... Front lens 5 ... Light chamber 10 ... Passing light source unit 11 ... Discharge bulb 12 ... Shade 13 ... Reflector 14 ... Halogen bulb 15 ... Reflector 20 ... Light source for traveling beam Unit 30 ... DRL light source unit 31 ... light source 32 ... circuit board 33 ... connector 34 ... cable 35 ... inner lens 35a ... step part 35b ... step part 35c ... condensing lens part 36 ... spacer 37 ... decorative panel 37a ... step part 37b Step part 37c ... Window hole part 38 ... Light source module 40 ... Outer lens 40a ... Front part 40b ... Upper surface part 40c ... Lower surface part 40d ... Lower surface 41 ... Main body 41a ... Extension part 41b ... Hook part 41c ... Bending part 41d ... Folding Curve 41e ... Bottom 41f ... Lower surface 42 ... Gap 43 ... Heat shield plate 43a ... Bent portion 43b ... Lower surface 43c ... Upper surface 44 ... Space 45 ... Extension 46 ... Extension 46a ... Upper surface 50 ... Gap 51 ... Gap 52 ... Gap

Claims (3)

  A semiconductor light-emitting element together with a light source unit for a passing beam and / or a light source unit for a traveling beam in a lamp chamber formed of a closed space formed by a housing having a front end opening and a lens attached to the front end opening of the housing. The DRL light source unit is located above the low beam light source unit and / or the traveling beam light source unit, and has a flat plate-like metal at the bottom. A heat shield plate is positioned and the heat shield plate is disposed along a constituent member of the DRL light source unit with a gap of a predetermined distance between the constituent members. Vehicle lamp.   The heat shield plate is bent upward on the rear end side to form a bent portion, and the bent portion is located at the rearmost portion of the DRL light source unit. The vehicle lamp as described.   The component member of the DRL light source unit facing the heat shield plate is bent upward on the rear end side to form a bent portion, and the bent portion of the heat shield plate is formed of the component member. The vehicular lamp according to claim 2, wherein the vehicular lamp is located rearward of the bent portion.

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