JP2013197070A - Vehicle lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lamp capable of lessening height of a reflector in a light irradiation direction of a light-emitting element.SOLUTION: A reflector 23 has a curved surface for covering a flat surface 22F of a heat sink 22, a first peripheral edge end 23P on a heat sink 22 side, and a second peripheral edge end 23Q on a first direction side. A gap T between the first peripheral edge end 23P of the reflector 23 and the heat sink 22 is set to be a gap T' between the first peripheral edge end 23P and the heat sink 22 located on an extended surface of a spread angle θ (30°-5°<θ<30°+5°) to a light irradiation surface 12A of the light-emitting element 21 on a portion most approached to the light-emitting element 21 out of the first peripheral edge end 23P.

Description

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

  As this type of vehicle lamp, for example, as shown in the cross-sectional view of FIG. 9, there is a heat sink 22 composed of a flat plate heat radiating material 22A and heat radiating fins 22B. Is mounted with a light emitting diode (light emitting element) 21. The light emitting diode 21 is made of a chip-like semiconductor element, and light from the light irradiation surface 21A is emitted in a direction intersecting with the flat surface 22F of the flat plate heat dissipation material 22A, for example, as indicated by an arrow A in the figure. It has become. Further, the reflector 23 is disposed so as to cover the flat surface 22F of the flat plate heat radiating member 22A. The reflector 23 is configured such that a surface facing the flat surface 22F of the flat plate heat radiating member 22A is a concave surface, and the concave surface is a light reflecting surface 23A. The light from the arrow A in the figure of the light emitting diode 21 is reflected by the light reflecting surface 23A of the reflector 23 and is emitted in the direction indicated by the arrow B in the figure, which is the direction intersecting the arrow A. The direction of arrow B in this figure is, for example, substantially parallel to the flat surface 22F of the flat plate heat dissipating material 22A, and the light reflected by the reflector 23 is emitted to the front of the vehicle, for example.

  FIG. 9 is a diagram corresponding to FIG. 5 showing the effect of the embodiment of the present invention. Refer to the description related to FIG. 5 for a detailed configuration other than the above description of FIG.

  The vehicular lamp having such a configuration is disclosed in, for example, Patent Document 1 below.

JP 2008-041558 A

  As described above, the vehicular lamp shown in FIG. 9 reflects light from the light emitting diode 21 by the reflector 23 and emits the light, for example, forward of the vehicle.

  For this reason, the reflector 23 opposes the heat sink 22 of the reflector 23 in order to make its light reflecting surface 23A a desired size (size as viewed from the front of the vehicle) and to make effective use of light from the light emitting diode 21 as much as possible. The peripheral edge 23P ′ is configured to extend toward the heat sink 22 so as to be positioned at least on the extended surface of the light irradiation surface 21A of the light emitting diode 21.

  Thereby, as shown in FIG. 9, the reflector 23 has a disadvantage that the height H ′ in the light irradiation direction of the light emitting diode 21 is increased, and the weight is increased accordingly, for example.

  This invention is made | formed in view of such a situation, The objective is to provide the vehicle lamp which can make the height in the irradiation direction of the light of a light emitting element in a reflector.

  In order to achieve such an object, the present invention confirms that the light from the light emitting diode 21 is not irradiated with a sufficient amount of light in the vicinity of the peripheral edge 23P ′ facing the heat sink 22 of the reflector 23, By adopting a configuration in which the vicinity of the peripheral edge 23P ′ of the reflector 23 is removed, the height of the light emitting element (light emitting diode 21) in the light irradiation direction is reduced in the reflector 23.

The present invention is grasped by the following composition.
(1) The vehicular lamp according to the present invention includes at least a heat sink, a light emitting element, and a reflector, the heat sink has a flat surface, and the light emitting element is in a region of the flat surface of the heat sink. The light irradiation surface is mounted so as to emit light in a first direction intersecting the flat surface, and the reflector reflects the light from the light emitting element and then intersects the first direction. The reflector has a curved surface covering the flat surface of the heat sink, and has a first peripheral edge on the heat sink side and a second peripheral edge on the first direction side. And the first peripheral edge of the reflector has a gap with the heat sink, and the gap is at least a portion of the first peripheral edge closest to the light emitting element. In this case, the light emitting element is set to have a gap with the heat sink when positioned on an extended surface having a spread angle θ (30 ° −5 ° <θ <30 ° + 5 °) with respect to the light irradiation surface. Features.
(2) The vehicular lamp according to the present invention includes at least a heat sink, a light emitting element, and a reflector, the heat sink has a flat surface, and the light emitting element is provided in a region of the flat surface of the heat sink. The light irradiation surface is mounted so as to emit light in a first direction intersecting the flat surface, and the reflector reflects the light from the light emitting element and then intersects the first direction. The reflector has a curved surface covering the flat surface of the heat sink, and has a first peripheral edge on the heat sink side and a second peripheral edge on the first direction side. And the first peripheral edge of the reflector has a gap with the heat sink, and the gap has the first peripheral edge of the reflector at the light irradiation surface of the light emitting element. Characterized in that it is configured to be positioned on the extended plane of the spread angle θ (30 ° -5 ° <θ <30 ° + 5 °) from the center of the light irradiation surface with.

  The vehicular lamp configured as described above can reduce the height of the light emitting element in the light irradiation direction in the reflector.

It is sectional drawing which shows the principal part of Embodiment 1 of the vehicle lamp of this invention. It is a block diagram which shows the whole Embodiment 1 of the vehicle lamp of this invention. It is a front view of the lamp | ramp comprised by Embodiment 1 of the vehicle lamp of this invention. It is a schematic diagram which shows irradiation of the light from the light irradiation surface of a light emitting diode. It is sectional drawing which shows the effect of Embodiment 1 of the vehicle lamp of this invention. It is a front view which shows an example of the lamp | ramp comprised by Embodiment 2 of the vehicle lamp of this invention. It is a front view which shows the other example of the lamp | ramp comprised by Embodiment 2 of the vehicle lamp of this invention. It is a front view which shows the lamp | ramp comprised by Embodiment 3 of the vehicle lamp of this invention. It is sectional drawing of the lamp | ramp comprised by the conventional vehicle lamp.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
(Embodiment 1)
FIG. 2 is a cross-sectional view schematically showing Embodiment 1 of the vehicular lamp according to the present invention. The vehicle lamp 10 shown in FIG. 2 shows, for example, a headlamp (head lamp) as an example. In FIG. 2, the x, y, and z directions are shown to match the forward direction, the width direction, and the height direction of the vehicle, respectively, when the vehicular lamp 10 is attached to the vehicle.

  In FIG. 2, the vehicular lamp 10 defines a lamp chamber 13 by a front lens 11 and a housing 12. The housing 12 has an opening 12A in the front portion of the vehicle, and a groove portion 14 into which the peripheral edge portion 11A of the front lens 11 is inserted is formed at the edge of the opening 12A. A hot melt 15 is applied to the groove portion 14 of the housing 12, and the hot melt 15 secures the peripheral edge portion 11 </ b> A of the front lens 11 and can secure a sealing property to prevent moisture from entering.

  A lamp 20 is disposed in the lamp chamber 13 of the vehicular lamp 10. The lamp 20 includes, for example, a light emitting diode (light emitting element) 21, a heat sink 22, and a reflector 23. FIG. 3 is a front view of the lamp 20 as viewed from the front (front lens 11 side).

  The heat sink 22 is configured by a flat plate heat radiating material 22A disposed at the upper part of the lamp chamber 13, and a heat radiating fin 22B formed on the upper surface of the flat plate heat radiating material 22A. The radiating fins 22B are composed of, for example, a plurality of fins arranged in parallel in the y direction in the drawing and extending in the x direction in the drawing. The heat radiating fins 22 </ b> B increase the surface area of the heat sink 22, thereby sufficiently dissipating heat generated when the light emitting diode 21 described later is turned on through the heat sink 22.

  The lower surface of the flat plate heat radiating member 22A of the heat sink 22 is a flat surface 22F, and the chip-like light emitting diode 21 is mounted in a region that is relatively far from the front lens 11 of the flat surface 22F. A light irradiation surface 21A is formed on the main surface of the light emitting diode 21, and the light emitting diode 21 is arranged on the flat plate heat radiation member 22A of the heat sink 22 so that the light irradiation surface 21A is directed downward in the figure. It has become. Thereby, the light from the light irradiation surface 21A of the light emitting diode 21 crosses the flat surface 22F of the flat plate heat dissipation material 22A (for example, the direction of arrow A in the figure: sometimes referred to as the first direction in this specification). It comes out.

  The reflector 23 has, for example, a free-form surface that combines a paraboloid of revolution, a parabolic column surface, and the like, and the concave side of the reflector 23 is the lower surface of the flat heat dissipation material 22A of the heat sink 22, that is, the side where the light emitting diode 21 is mounted. It arrange | positions so that the flat surface 22F may be covered. The reflector 23 includes a light reflecting surface 23A on the concave surface side thereof, and reflects light from the light emitting diode 21 indicated by an arrow A in the drawing by the light reflecting surface 23A of the reflector 23 and then intersects the direction of the arrow A. The light is emitted in the direction of arrow B in the drawing (sometimes referred to as the second direction in this specification). The direction of the arrow B in the figure is, for example, substantially parallel to the flat surface 22F of the flat plate heat dissipation material 22A, and the light reflected by the reflector 23 is emitted to the front of the vehicle. The reflector 23 having such a function includes a first peripheral edge 23P facing the heat sink 22 and a second peripheral edge 23Q directed in the direction of arrow B in the figure at the peripheral edge of the free curved surface that becomes the light reflecting surface 23A. And is configured.

  In such a configuration, the reflector 23 is disposed such that the first peripheral edge 23 </ b> P has a gap T between the flat surfaces 22 </ b> F of the heat sink 22. In this case, the gap T is set according to the following values.

  FIG. 1 is an enlarged view showing a plate-like heat radiating material 12A and a reflector 23 in the vicinity where the light emitting diode 21 is mounted in the configuration shown in FIG. As shown in FIG. 1, the light from the light irradiation surface 21A of the light emitting diode 21 is emitted radially, and the emission range is within a plane including the vertical line O of the light irradiation surface 21A. About the vertical line O, the angle is 180 ° ± 5 °. Here, the reason why the angle is ± 5 ° is that manufacturing variation of the light emitting diode 21 is taken into consideration. For this reason, the range from the light irradiation surface 21 </ b> A of the light emitting diode 21 to the spread angle θ (30 ° −5 ° <θ <30 ° + 5 °) is a range in which the amount of light from the light emitting diode 21 is extremely reduced. It has become.

  Therefore, in this embodiment, the gap T between the flat plate heat dissipating material 22A and the first peripheral edge 23P of the reflector 23 is set at the portion closest to the light emitting diode 21 in the first peripheral edge 23P. 21 is set by a gap T ′ with the heat sink 22 when positioned on the extended surface of the spread angle θ with respect to the light irradiation surface 21A. By doing so, a reduction in the total amount of light from the light emitting diode 21 is minimized, and an extra area of the reflector 23 is removed.

  Here, between the first peripheral edge 23P of the reflector 23 and the first peripheral edge 23P of the reflector 23 on the basis of the gap T ′ that satisfies the above condition in the portion of the first peripheral edge 23P of the reflector 23 that is closest to the light emitting diode 21. The gap T is set for the following reason. That is, FIG. 4 is a perspective view of the light emitting diode 21 as viewed from the light irradiation surface 21A side, and shows an extended surface EF defined by a spread angle θ with respect to the light irradiation surface 21A. The extended surface EF serves as a boundary surface between a region where light is sufficiently emitted from the light emitting diode 21 and a region where the amount of light is extremely reduced. In this case, as shown in FIG. 4, the distance h to the extended surface EF on the extending surface of the light irradiation surface 21 </ b> A of the light emitting diode 21 takes a value that varies depending on the distance d from the light emitting diode 21. . That is, as the distance d from the light emitting diode 21 increases, the distance h to the extended surface EF of the spread angle θ with respect to the light irradiation surface 21A of the light emitting diode 21 increases. Therefore, in the first embodiment, the gap T ′ set in the portion of the first peripheral portion 23P of the reflector 23 closest to the light emitting diode 21 is set between the flat plate heat dissipation material 22A and the first peripheral portion 23P of the reflector 23. By using the gap T, light from the light emitting diode 21 is prevented from leaking even at the first peripheral edge portion 23P that is relatively far from the light emitting diode 21.

As shown in FIG. 5, the lamp 20 configured as described above has a height H of the reflector 23 itself that is small because the gap T can be provided between the first peripheral edge 23 </ b> P of the reflector 23 and the heat sink 22. Can be configured. The height H of the reflector 23 corresponds to a value obtained by subtracting the interval T from the height H ′ of the reflector 23 shown in FIG. 9 when compared with the conventional configuration shown in FIG. For this reason, the volume of the reflector 23 can be made small, and there exists an effect which can comprise a weight lightly.
(Embodiment 2)
In the first embodiment, the lower surface of the flat plate heat radiating member 22A of the heat sink 22, that is, the flat surface 22F on the side where the light emitting diode 21 is mounted is arranged substantially parallel to the xy plane in the drawing. However, as shown in FIG. 6, for example, from the viewpoint of design, the present invention is applied even when the lower surface of the flat plate heat radiating material 22 </ b> A is inclined at an angle α in the y direction in the drawing with respect to the xy surface in the drawing. Needless to say, it can be done. In this case, the first peripheral edge 23P of the reflector 23 is also inclined with respect to the xy plane in the drawing at an angle α in the y direction in the drawing, and the gap of the above-described value is provided between the flat plate heat radiating material 22A of the heat sink 22. It has T.

  In FIG. 6, the light emitting diode 21 is mounted on the flat plate heat radiating member 22A so that the light irradiation surface 21A is substantially parallel to the xy plane in the drawing. Thus, by configuring the light reflecting surface 23A of the reflector 23 in substantially the same manner as the light reflecting surface 23A of the reflector 23 shown in the first embodiment, the light distribution of the light reflected by the reflector 23 can be made as predetermined. it can.

In FIG. 7, the lower surface of the flat plate heat dissipation material 22A of the heat sink 22 is inclined at an angle α in the y direction in the drawing with respect to the xy plane in the drawing, and the light emitting surface 21A of the light emitting diode 21 is also in the xy plane in the drawing. On the other hand, the flat plate heat dissipating material 22A is mounted so as to be inclined at an angle α in the y direction in the figure. In this case, in order to make the light distribution of the light reflected by the reflector 23 as predetermined, the shape of the light reflecting surface 23A of the reflector 23 is different from the case shown in FIG. 6, but the first peripheral edge 23P of the reflector 23 is shown in FIG. It is configured to be inclined with respect to the middle xy plane at an angle α in the y direction in the figure, and is configured to have the above-described gap T between the heat sink 22 and the flat plate heat dissipation material 22A.
(Embodiment 3)
In Embodiment 1, the gap T between the heat sink 22 and the reflector 23 is an extended surface of the light emitting diode 21 with respect to the light irradiation surface 21 </ b> A at the portion closest to the light emitting diode 21 in the first peripheral edge 23 </ b> P of the reflector 23. The gap T ′ when positioned on the EF is set to a constant value.

  However, the present invention is not limited to this, and the gap between the heat sink 22 and the reflector 23 is such that the first peripheral edge portion 23P of the reflector 23 extends over the entire area with respect to the light irradiation surface 21A of the light emitting diode 21 and extends the angle θ. You may make it set so that it may be located on a surface.

  In this case, the gap between the flat plate heat radiating member 22 </ b> A of the heat sink 22 and the first peripheral edge 23 </ b> P of the reflector 23 is not constant but changes according to the distance from the light emitting diode 21. That is, the gap between the flat plate heat dissipation material 22A of the heat sink 22 and the first peripheral edge 23P of the reflector 23 is the smallest in the portion of the first peripheral edge 23P behind the light emitting diode 21, and the second along the first peripheral edge 23P. As it approaches the boundary with the peripheral edge 23Q, it gradually increases. FIG. 8 is a front view of the lamp 20 drawn in association with FIG. As shown in FIG. 8, in the first peripheral edge portion 23P of the reflector 23, the portion closest to the light emitting diode 21 has a gap T ′ with the heat sink 22 (the same value as the gap T ′ in the first embodiment) and emits light. A gap T ″ (> T ′) is formed between the second peripheral edge 23Q farthest from the diode 21 (indicated by reference numeral BD in the drawing) and the heat sink 22. In this case, light emission is performed. In the first embodiment, the gap T ′ is set so that the first peripheral edge 23P closest to the diode 21 is positioned on the extended surface with the spread angle θ with respect to the light irradiation surface 21A of the light emitting diode 21. Similarly, the light from the light emitting diode 21 also extends from the gap T ′ to the boundary with the second peripheral edge 23Q along the first peripheral edge 23P. 8 is positioned on an extended surface having a spread angle θ with respect to the incident surface 21 A. In Fig. 8, the portion of the first peripheral edge 23P farthest from the light emitting diode 21 (the boundary BD with the second peripheral edge 23Q). ) Shows that the gap T ″ is set so as to be positioned on the extended surface with the spread angle θ with respect to the light irradiation surface 21A of the light emitting diode 21.

When configured in this way, an extra area can be removed compared to the reflector 23 shown in the first embodiment, and the reflector 23 can be reduced in weight.
(Embodiment 4)
Of course, the gap between the first peripheral edge 23P of the reflector 23 and the heat sink 22 shown in the third embodiment can be applied as it is even when the heat sink 22 is configured as shown in FIGS.
(Embodiment 5)
The vehicular lamp 10 shown in the embodiment 1 has a structure in which the light emitting diode 21 is arranged on the upper side and the reflector 23 is arranged on the lower side when the vehicular lamp 10 is attached to the vehicle. However, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to a structure in which the light emitting diode 21 is disposed below and the reflector 23 is disposed above. In this case, the heat sink 22 is disposed below the reflector 23, and the above-described gaps T, T ′, T ″ are secured between the heat sink 22 and the reflector 23.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle lamp, 11 ... Front lens, 11A ... Peripheral part (front lens), 12 ... Housing, 12A ... Opening (housing), 13 ... Lamp chamber, 14 ... Groove, 15 ...... Hot melt, 20 ... Lamp, 21 ... Light emitting diode, 21A ... Light irradiation surface (light emitting diode), 22 ... Heat sink, 22A ... Plate heat radiating material, 22B ... Heat radiation fin, 22F ... Flat surface (Of a flat plate heat sink), 23... Reflector, 23 A... Light reflecting surface, 23 P... First peripheral edge, 23 Q. Extended surface of ° -5 ° <θ <30 ° + 5 °).

Claims (2)

At least a heat sink, a light emitting element, and a reflector,
The heat sink has a flat surface, and the light emitting element is mounted on a region of the flat surface of the heat sink so that light from the light irradiation surface is emitted in a first direction intersecting the flat surface. The reflector is a vehicular lamp for emitting light in a second direction intersecting the first direction after reflecting light from the light emitting element,
The reflector includes a curved surface that covers the flat surface of the heat sink, and has a first peripheral edge on the heat sink side and a second peripheral edge on the first direction side,
The first peripheral edge of the reflector has a gap with the heat sink, and the gap is at least a portion of the first peripheral edge closest to the light emitting element. A vehicular lamp characterized by being set by a gap with the heat sink when located on an extended surface with a spread angle θ (30 ° −5 ° <θ <30 ° + 5 °) with respect to an irradiation surface. At least a heat sink, a light emitting element, and a reflector,
The heat sink has a flat surface, and the light emitting element is mounted on a region of the flat surface of the heat sink so that light from the light irradiation surface is emitted in a first direction intersecting the flat surface. The reflector is a vehicular lamp for emitting light in a second direction intersecting the first direction after reflecting light from the light emitting element,
The reflector includes a curved surface that covers the flat surface of the heat sink, and has a first peripheral edge on the heat sink side and a second peripheral edge on the first direction side,
The first peripheral edge of the reflector has a gap with the heat sink;
The gap is such that the first peripheral edge of the reflector is spread from the center of the light irradiation surface with respect to the light irradiation surface of the light emitting element θ (30 ° −5 ° <θ <30 ° + 5 °) It is set so that it may be located on the extended surface of vehicle, The vehicle lamp characterized by the above-mentioned.

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