JP6137811B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp including a hood that shields part of light from a light source in order to prevent dazzling due to direct light.

  In recent years, for example, in vehicle headlamps, power-saving and long-life LEDs have been used as light sources. However, because LEDs are highly directional, they are obscured by pedestrians and drivers of oncoming vehicles. (Dazzle) may be given.

  Therefore, direct light from the upper LED 105 among the LEDs 105 and 106 fixed to the upper and lower surfaces of the fixing portion 109c of the heat sink 109 installed in the lamp chamber 104 as in the vehicular lamp 101 shown in FIG. A hood 110 for shielding is provided (see, for example, Patent Document 1). In the vehicular lamp 101 shown in FIG. 6, reference numeral 102 denotes a housing, 103 denotes a lens that covers the front opening of the housing 102, and 107 and 108 denote light from the LEDs 105 and 106 in front of the vehicle (left side in FIG. 6). It is a reflector for reflecting toward.

  In such a vehicular lamp 101, for example, when the two upper and lower LEDs 105 and 106 are simultaneously activated to emit light, the lights are reflected by the reflectors 107 and 108, respectively, toward the front of the vehicle (left side in FIG. 6). The light is transmitted through the lens 103 and emitted to the front of the vehicle. In this case, since the direct light from the upper LED 105 is shielded by the hood 110, the illusion that the direct light gives to pedestrians and drivers of oncoming vehicles is reduced.

  Further, the heat generated by the light emission of the LEDs 105 and 106 is conducted to the heat sink 109 and is radiated into the lamp chamber 104 by the heat sink 109, so that the abnormal temperature rise of the LEDs 105 and 106 is prevented.

JP 2010-040322 A

  However, in the conventional vehicular lamp 101 shown in FIG. 6, the front wall 110 b of the hood 110 is completely closed, so that convection generated in the lamp chamber 104 due to heat generated by the LEDs 105 and 106 is limited by the hood 110. In addition, part of the airflow does not flow into the space around the LEDs 105 and 106 surrounded by the hood 110. For this reason, hot air stays in the space around the LEDs 105 and 106, and the LEDs 105 and 106 are not effectively cooled, so that there is a problem that the temperature rise of the LEDs 105 and 106 cannot be kept low. Incidentally, the LEDs 105 and 106 have a drawback that the luminous efficiency and the lifetime are lowered when their temperature rises.

  The present invention has been made in view of the above viewpoints, and an object thereof is to provide a vehicular lamp that can promote convection in a lamp chamber and suppress an increase in temperature of a light source.

In order to achieve the above object, the invention according to claim 1
A light source fixed on at least a fixing member, a reflector for reflecting light from the light source, and a hood for shielding a part of the light from the light source in a lamp chamber defined by a housing and a lens covering the opening. In a vehicle lamp comprising
The fixing member extends horizontally toward the front from a base plate provided with a plurality of heat dissipating fins on the back surface,
The light source has an upper LED for irradiating light upward and a lower LED for irradiating light downward on the upper and lower surfaces of the fixing member, respectively.
In the reflector, an upper reflector disposed above the upper LED and a lower reflector disposed below the lower LED are integrally formed,
The upper reflector is provided with a reflective surface having a focal point near the upper LED,
The lower reflector is provided with a reflective surface having a focal point near the lower LED,
The hood includes at least an upper wall extending forward from a rear edge located behind the upper LED, and a front wall extending downward from a front edge of the upper wall,
The front wall of the hood is located between the upper LED and the lower LED and the lens, and has a plurality of vent holes spaced laterally,
A plurality of thin thin heat dissipating fins in the horizontal direction are formed between the air holes adjacent to the air holes.

According to a second aspect of the invention of claim 1 Symbol mounting, characterized by being configured with said hood and said reflector together.

  According to the first aspect of the present invention, since a plurality of ventilation holes are formed in the hood, the convection generated in the lamp chamber due to the heat generated by the LED is not limited by the hood, and the airflow is generated in the space around the LED surrounded by the hood. Part flows through the hood vent. For this reason, hot air does not stay in the space around the light source, the convection in the lamp chamber is promoted, the temperature in the lamp chamber is made uniform, the light source is effectively cooled, and the temperature rise is kept low.

Further, according to the first aspect of the invention, the heat of the surrounding light source by the radiation fins formed between the hood adjacent the vent hole is effectively dissipated, the temperature rise of the light source is more effectively It can be suppressed.

According to the second aspect of the present invention, by integrating the hood and the reflector, the number of parts and the number of assembling steps can be reduced and the cost can be reduced.

1 is a front view of a vehicular lamp according to the present invention. It is the sectional view on the AA line of FIG. It is the B section enlarged detail drawing of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a sectional side view of the conventional vehicle lamp.

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

  1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is an enlarged detail view of a portion B in FIG. FIGS. 5 and 5 are sectional views taken along the line DD of FIG. 3, and the illustrated vehicular lamp 1 is a headlamp disposed at the front of the vehicle.

  As shown in FIG. 2, the illustrated vehicular lamp 1 has a light chamber 4 defined by a housing 2 and a lens 3 that covers a front opening of the housing 2. , 6 to reflect the light from the upper and lower reflectors 7, 8, the heat sink 9 for radiating the heat generated by the LEDs 5, 6 into the lamp chamber 4, and the hood 10 for shielding the direct light from the upper LED 5. It is configured to accommodate.

  The housing 2 is integrally formed in a bottomed cylindrical shape by a light-impermeable resin, and a fitting groove 2a that opens toward the front is formed at the periphery of the front opening. Further, the lens 3 is integrally formed in a bowl shape with a light-transmitting transparent resin, and a leg portion 3a integrally projecting rearward from the peripheral edge of the opening portion is a front opening portion of the housing 2. The lens 3 is fixed to the housing 2 by being fitted into the fitting groove 2a formed on the peripheral edge of the lens from the front, and the fitting portion is adhered by an adhesive 11 such as hot melt. The front opening of is covered.

  The heat sink 9 is integrally formed by aluminum die casting or the like having high thermal conductivity. The base plate 9a has a vertical base plate 9a and a back surface of the base plate 9a at an appropriate interval in the lateral direction (the vertical direction in FIG. 2). A plurality of rectangular plate-like heat radiation fins 9b standing vertically and a fixing portion 9c extending horizontally from the front intermediate height position of the base plate 9a to the front are provided. The LEDs 5 and 6 are fixed to the upper and lower surfaces of the fixing portion 9c of the heat sink 9, respectively.

  As shown in FIG. 2, the reflectors 7 and 8 are respectively disposed above and below the LEDs 5 and 6 in the lamp chamber 4. In the present embodiment, the reflectors 7 and 8, the hood 10, Is integrally formed by aluminum die casting with high thermal conductivity. Here, the upper and lower reflectors 7 and 8 are provided with paraboloidal reflecting surfaces 7a and 8a each having a focal point in the vicinity of the LEDs 5 and 6, respectively, and the reflecting surfaces 7a and 8a have aluminum vapor deposition or the like. Each of the reflection processes is applied.

  The hood 10 formed integrally with the reflectors 7 and 8 is formed in a U-shape (channel shape) in a vertical cross section, and an edge of the upper wall 10a extends rearward to the upper LED 5. . As shown in FIGS. 1, 3 and 4, the vertical front wall 10b of the hood 10 has slit-like vent holes 12 which are long in the vertical direction and are suitable in the horizontal direction (left and right direction in FIG. 1). A plurality of thin radiating fins 13 in the vertical direction are formed between adjacent vent holes 12 in the lateral direction at appropriate intervals.

  In the vehicular lamp 1 configured as described above, for example, when the two upper and lower LEDs 5 and 6 are simultaneously activated and emit light, the light is reflected by the reflecting surfaces 7a and 8a of the reflectors 7 and 8, respectively. Heading forward (to the left in FIG. 2), the light is transmitted through the lens 3 and emitted to be used for illumination in front of the vehicle. In this case, since the direct light from the upper LED 5 is shielded by the hood 10, the illusion that the direct light gives to pedestrians and drivers of oncoming vehicles is reduced.

  Further, the heat generated by the light emission of the LEDs 5 and 6 is conducted to the heat sink 9 and is radiated from the plurality of heat radiation fins 9b of the heat sink 9 into the lamp chamber 4, so that the abnormal temperature rise of the LEDs 5 and 6 is prevented. It is.

  Thus, in the vehicular lamp 1 according to the present embodiment, since the plurality of vent holes 12 are formed in the front wall 10b of the hood 10, the convection generated in the lamp chamber 4 due to the heat generated by the LEDs 5 and 6 is hood. A part of the airflow flows into the space around the LEDs 5 and 6 surrounded by the hood 10 through the vent hole 12 of the hood 10 as indicated by an arrow in FIG. Therefore, hot air does not stay in the space around the LEDs 5 and 6, convection in the lamp chamber 4 is promoted, the temperature in the lamp chamber 4 is made uniform, and the LEDs 5 and 6 are effectively cooled. The temperature rise is kept low. As a result, a decrease in the light emission efficiency of the LEDs 5 and 6 is prevented, a predetermined irradiation light quantity is ensured, and the lifetime of the LEDs 5 and 6 is increased.

  In the present embodiment, since the heat radiation fins 13 are formed between the adjacent vent holes 12 of the front wall 10b of the hood 10, the heat around the LEDs 5 and 6 is effectively radiated by these heat radiation fins 13. The For this reason, the temperature rise of LED5, 6 is suppressed more effectively.

  Further, in the present embodiment, since the hood 10 and the reflectors 7 and 8 are integrally configured, an effect that the number of parts and the number of assembling steps can be reduced and the cost can be reduced is obtained.

  In the above, the embodiment in which the present invention is applied to a vehicle headlamp has been described. However, the present invention is of course applicable to any vehicle lamp other than the headlamp. . In the above embodiment, the present invention is applied to a vehicular lamp using an LED as a light source. However, the present invention is also applied to a vehicular lamp using a bulb as a light source. It is applicable to.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2a Housing fitting groove 3 Lens 3a Lens leg 4 Lamp chamber 5, 6 LED (light source)
7,8 Reflector 7a, 8a Reflector of reflector 9 Heat sink 9a Base plate of heat sink 9b Heat sink fin 9c Heat sink fixing part 10 Hood 10a Upper wall 10b Hood front wall 11 Adhesive 12 Ventilation hole 13 Heat sink fin

Claims (2)

A light source fixed on at least a fixing member, a reflector for reflecting light from the light source, and a hood for shielding a part of the light from the light source in a lamp chamber defined by a housing and a lens covering the opening. In a vehicle lamp comprising
The fixing member extends horizontally toward the front from a base plate provided with a plurality of heat dissipating fins on the back surface,
The light source has an upper LED for irradiating light upward and a lower LED for irradiating light downward on the upper and lower surfaces of the fixing member, respectively.
In the reflector, an upper reflector disposed above the upper LED and a lower reflector disposed below the lower LED are integrally formed,
The upper reflector is provided with a reflective surface having a focal point near the upper LED,
The lower reflector is provided with a reflective surface having a focal point near the lower LED,
The hood includes at least an upper wall extending forward from a rear edge located behind the upper LED, and a front wall extending downward from a front edge of the upper wall,
The front wall of the hood is located between the upper LED and the lower LED and the lens, and has a plurality of vent holes spaced laterally,
A vehicular lamp characterized in that a plurality of thin heat dissipating fins in the vertical direction are formed in the horizontal direction between the air holes adjacent to the air holes.
The hood and the reflector and the vehicle lighting device according to claim 1 Symbol placement, characterized by being configured integrally.

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