JP2016201196A - Vehicle lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of preventing deterioration of light intensity of irradiation light by radiating one part of the light emitting from a light source as direct light.SOLUTION: A vehicular lighting fixture 1 comprises by accommodating at least an LED (light source) 5 and a reflector for reflecting light emitted from the LED 5, in a lamp chamber 4 defined by an outer lens 3 for covering a housing 2 and an opening. The LED 5 is arranged so that the light emission direction becomes substantially horizontal forward. The reflector is constituted by a first reflector 7 for reflecting the light from the LED 5 and a second reflector 8 for reflecting the reflection light reflected by the first reflector 7 frontward. A slit hole 7A is formed at the first reflector 7 for allowing direct light from the LED 5 to pass.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reflector-type vehicular lamp that reflects light emitted from an LED (light emitting diode), which is a light source, in a desired direction by a reflector.

  Increasingly, vehicle lamps such as fog lamps use LEDs as light sources that have advantages such as high luminous efficiency, long life, and low power consumption. Such a vehicular lamp includes a reflector type that reflects light emitted from an LED toward a desired direction (front or rear of the vehicle) by a reflector. Here, the vehicular lamp proposed in Patent Document 1 is shown in FIG.

  That is, FIG. 3 is a longitudinal sectional view of the vehicular lamp proposed in Patent Document 1, and the vehicular lamp 101 shown is used as a fog lamp. The vehicular lamp 101 is disposed in a lamp chamber 104 defined by a housing 102 and an outer lens 103 that covers a front opening thereof, an LED 105 that is a light source, an LED substrate 106 that mounts the LED 105, and an LED 105. A reflector 107, a circuit board 109 disposed below the reflector 107, an extension 110 disposed inside the outer lens 103, and the like are accommodated. Here, the LED 105 is mounted on the bottom surface of the LED substrate 106 so that the light emission direction is downward, and the LED substrate 106 is fixed to the bracket 112 by a holder 111. The bracket 112 is fixed to the housing 102 with a screw 113.

  In such a vehicular lamp 101, when a current is supplied from a power source (not shown) such as a battery to the LED 105 via the LED substrate 106, the LED 105 emits light, and the light is emitted downward. This light is reflected forward (to the left in FIG. 3) by the reflector 107, and the reflected light passes through the opening of the extension 110 and the outer lens 103 and is irradiated forward. The lamp 101 functions as a fog lamp.

JP 2014-086328 A

  However, in the vehicular lamp 101 shown in FIG. 3 proposed in Patent Document 1, all light emitted from the LED 105 is reflected by the reflector 107 and travels forward, and therefore is reflected due to the reflectance of the reflector 107. There was a problem that the intensity of light was attenuated and the intensity of light irradiated forward decreased.

  Therefore, the object of the present invention is to provide a vehicular lamp that can prevent a decrease in luminous intensity of irradiated light by irradiating a part of light emitted from a light source as direct light.

  Further, in the vehicular lamp 101 shown in FIG. 3, the heat generated by the LED 105 is conducted from the LED board 106 to the housing 102 through the bracket 112, so that the heat transfer area is small, the heat transfer path is long, and high. There was a problem that the temperature rise of the LED 105 could not be effectively suppressed because heat dissipation was not obtained.

  Accordingly, the object of the present invention is to provide a vehicular lamp that can ensure high heat dissipation and effectively suppress the temperature rise of the LED.

  Further, in the vehicular lamp 101 shown in FIG. 3, since the LED board 106 and the circuit board 109 are separately provided, the number of parts is increased and the cost is increased, and the LED board 106 and the circuit board 109 are mounted. There is a problem that the space for housing becomes large.

  Accordingly, an object of the present invention is to provide a vehicular lamp that can reduce the number of parts to reduce costs and save space.

  In order to achieve the above object, according to a first aspect of the present invention, at least a light source and a reflector that reflects light emitted from the light source are accommodated in a lamp chamber defined by an outer lens that covers a housing and an opening of the housing. In the vehicular lamp, the light source is arranged so that the light emission direction is substantially horizontal forward, and the reflector reflects the light from the light source, and the reflected light reflected by the first reflector. The first reflector is formed with a slit hole that allows direct light from the light source to pass therethrough.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the slit hole is formed in an angle range of 1 ° to 2.5 ° below the optical axis with the light source as a center.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the light source is constituted by an LED, and an LED substrate on which the LED is mounted is closely fixed to substantially the entire rear wall of the housing. To do.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a circuit board is integrally incorporated in the LED board.

  According to a fifth aspect of the invention, in the invention of the third or fourth aspect, the housing also serves as a heat sink.

  According to the first aspect of the present invention, part of the light emitted from the light source passes through the slit hole formed in the first reflector without being reflected by the first and second reflectors, and forwards as direct light. Since it is irradiated, it is possible to suppress a decrease in luminous intensity of the irradiated light.

  According to the second aspect of the present invention, the slit hole is formed in an angle range from 1 ° to 2.5 ° below the optical axis with the light source as the center, thereby being applied to the vehicle lamp. Can meet optical standards.

  According to the third aspect of the present invention, since the LED substrate on which the LED is mounted is closely fixed to the substantially entire surface of the rear wall of the housing, the heat generated by the LED is directly transmitted from the substrate to the housing and radiated from the housing. For this reason, the heat transfer path is shortened, a large heat transfer area is secured, the LED is efficiently cooled, and the temperature rise is suppressed low.

  According to the invention described in claim 4, by integrating the LED board and the circuit board, it is possible to reduce the number of parts, thereby reducing the cost and saving the space.

  According to the fifth aspect of the present invention, since the housing also serves as a heat sink, the heat dissipation of the housing is enhanced, and the temperature rise of the LED is further effectively suppressed.

It is a longitudinal cross-sectional view of the vehicle lamp which concerns on this invention. It is a perspective view of the 1st and 2nd reflector of the vehicle lamp which concerns on this invention. It is a longitudinal cross-sectional view of the vehicle lamp proposed in Patent Document 1.

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

  FIG. 1 is a longitudinal sectional view of a vehicular lamp according to the present invention, FIG. 2 is a perspective view of first and second reflectors of the vehicular lamp, and the vehicular lamp 1 according to the present embodiment is It is used as a fog lamp arranged on the left and right of the unit. Since the basic configuration of the left and right vehicular lamps 1 is the same, only one of the vehicular lamps 1 will be illustrated and described below.

  As shown in FIG. 1, a vehicular lamp functioning as a fog lamp has an LED 5 as a light source and an LED 5 in a lamp chamber 4 defined by a housing 2 that also serves as a heat sink and an outer lens 3 that covers the front opening. An LED substrate 6 to be mounted, a first reflector 7 disposed in front of the light emitting direction of LED 5 (leftward in FIG. 1), and a second reflector 8 disposed below the first reflector 7 are accommodated. Has been.

  The housing 2 also serving as a heat sink is integrally formed by aluminum die casting having high thermal conductivity, and the outer peripheral edge of the transparent outer lens 3 is bonded to the peripheral edge of the front opening thereof, thereby the outer lens 3 and The lamp chamber 4 is defined by the housing 2. The LED substrate 6 having a large area is closely attached and fixed to the inner surface of the vertical rear wall 2A of the housing 2, and the LED 5 emits light on the front upper portion of the LED substrate 6. It is mounted so that the direction is forward. In the present embodiment, a circuit board (not shown) is integrated into the LED board 6 and both are integrated.

  The first reflector 7 has a shape obtained by sweeping a parabola, and the inner surface forming the concave curved surface constitutes a first reflecting surface 7a. The first reflecting surface 7a has a reflection treatment such as aluminum deposition. Is given. In addition, as shown in FIG. 2, a thin slit hole 7 </ b> A is formed in a part of the first reflector 7 over substantially the entire width. Specifically, as shown in FIG. 1, the slit hole 7 </ b> A is formed in an angle range of 1 ° to 2.5 ° below the horizontal optical axis x around the LED 5.

  The second reflector 8 disposed below the first reflector 7 is a flat plate member inclined obliquely downward toward the front, and its upper surface constitutes a second reflecting surface 8a. The second reflecting surface 8a of the second reflector 8 is subjected to a reflection process such as aluminum vapor deposition.

  In the vehicular lamp 1 configured as described above, when an electric current is supplied from a power source (not shown) such as a battery to the LED 5 through the circuit board and the LED board 6, the LED 5 emits light, and the light is directed forward. And exit. A part of the light emitted forward from the LED 5 is reflected downward by the first reflecting surface 7a of the first reflector 7 as shown by a black arrow in FIG. Head for. The light traveling toward the second reflector 8 is reflected by the second reflecting surface 8a of the second reflector 8, travels forward, and passes through the transparent outer lens 3 and is irradiated forward of the vehicle.

  Further, another part of the light emitted forward from the LED 5 is not reflected by the first reflector 7 and the second reflector 8 as shown by the white arrows in FIG. The light passes through the formed slit hole 7A, travels forward as direct light, passes through the transparent outer lens 3 and is irradiated forward of the vehicle.

  As described above, after a part of the light emitted from the LED 5 is reflected by the first reflector 7 and the second reflector 8, it passes through the outer lens 3 and is irradiated forward of the vehicle, and in addition to the light emitted from the LED 5. Part of the light passes through the slit hole 7A of the first reflector 7 and travels straight as the direct light to the front of the vehicle and passes through the outer lens 3 and is irradiated to the front of the vehicle. Therefore, the vehicular lamp 1 is used as a fog lamp. Fulfills the function.

  Thus, in the vehicular lamp 1 according to the present embodiment, a part of the light emitted from the LED 5 passes through the slit hole 7A of the first reflector 7 and is irradiated to the front of the vehicle as direct light. There is no attenuation due to the reflection of the direct light, and the decrease in the luminous intensity of the irradiated light is suppressed to a low level by the direct light. And in this Embodiment, since the slit hole 7A of the 1st reflector 7 was formed in the angle range below 1 degrees-2.5 degrees from the optical axis x centering on LED5, the vehicle lamp 1 which functions as a fog lamp The light distribution standard applied to the can be satisfied.

  In the present embodiment, the LED board 6 on which the LED 5 is mounted is closely fixed to the substantially entire surface of the rear wall 2A of the housing 2, so that the heat generated by the LED 5 is directly transmitted from the LED board 6 to the housing 2 and the housing 2 Radiated from the heat. As a result, the heat transfer path is shortened, a large heat transfer area is secured, the LED 5 is efficiently cooled, and the temperature rise is suppressed low. And in this Embodiment, since the housing 2 serves as a heat sink with high heat dissipation, the heat dissipation of the housing 2 is improved and the temperature rise of LED5 is suppressed more effectively.

  Furthermore, in the vehicular lamp 1 according to the present embodiment, since the circuit board is integrated into the LED board 6 and both are integrated, the number of parts can be reduced, and the cost can be reduced and the space can be saved. Is obtained.

  In the above, the embodiment in which the present invention is applied to a vehicular lamp used as a fog lamp has been described. However, the present invention also applies to a reflector-type vehicular lamp that is used for any other purpose. Of course, it is applicable to.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2A Rear wall of housing 3 Outer lens 4 Lamp chamber 5 LED (light source)
6 LED board 7 1st reflector 7A 1st reflector slit 7a 1st reflective surface 8 2nd reflector 8a 2nd reflective surface x optical axis

Claims (5)

In a vehicular lamp that includes at least a light source and a reflector for reflecting light emitted from the light source in a lamp chamber defined by an outer lens that covers a housing and an opening thereof.
The light source is arranged so that the light emitting direction is substantially horizontal forward, and the reflector reflects the light reflected from the first reflector and the first reflector that reflects the light from the light source toward the front. A vehicular lamp characterized by comprising a second reflector to be formed, and a slit hole through which direct light from the light source passes is formed in the first reflector.   The vehicular lamp according to claim 1, wherein the slit hole is formed in an angle range of 1 ° to 2.5 ° below the optical axis with the light source as a center.   The vehicular lamp according to claim 1 or 2, wherein the light source is constituted by an LED, and an LED board on which the LED is mounted is fixed in close contact with substantially the entire rear wall of the housing.   4. The vehicular lamp according to claim 3, wherein a circuit board is integrally incorporated in the LED board. 5. The vehicular lamp according to claim 3, wherein the housing also serves as a heat sink.

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