JP2023025785A - Lighting fixture unit and vehicular lighting fixture - Google Patents

Abstract

To provide a lighting fixture unit in which while the cooling performance of a heat sink of the lighting fixture unit is improved, the size of the heat sink is reduced, and a vehicular lighting fixture.SOLUTION: A heat sink 2 of a lighting fixture unit comprises a base part 23 in which a light source unit is placed on a back surface of the base part 23 of the heat sink 2, and a plurality of fins formed on a front surface of the base part 23. The fins include a plurality of first fins 21 formed in nearly parallel with each other, and a second fin 22 formed in non-parallel with the first fins 21, and for guiding wind of a fan 4 to the first fins 21.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lamp unit equipped with a heat sink capable of efficiently dissipating heat from a light source, and a vehicle lamp including the lamp unit.

2. Description of the Related Art Conventionally, a technique is known in which a lamp unit is provided with a heat sink to efficiently dissipate the heat of a light source. For example, in Patent Document 1, each of a plurality of fins of a heat sink is provided with a notch, and the area of the notch is gradually expanded from one side to the other, thereby improving the degree of freedom in arranging the fan. A new lighting unit has been proposed.

JP 2020-92055 A

In recent years, while there has been a demand for downsizing of lamp units, the amount of heat generated inside the lamp unit tends to increase due to multifunctional lamps, and there has been a demand for improving the cooling performance of the heat sink. However, if the size of the heat sink is increased in order to improve the cooling performance of the heat sink, there is a problem that it becomes difficult to reduce the size of the lamp unit.

Accordingly, an object of the present disclosure is to provide a lamp unit capable of improving the cooling performance of the heat sink of the lamp unit while suppressing the size of the heat sink and downsizing the entire lamp unit, and a vehicle lamp including the lamp unit. to do.

In order to solve the above problems, the lighting unit of the present disclosure includes a light source unit mounted with a plurality of light emitting elements, a heat sink supporting the light source unit, and a fan blowing air to the heat sink to dissipate the heat of the heat sink. The heat sink includes a base on which the light source unit is placed, and a plurality of fins formed on the surface of the base. and a second fin formed non-parallel to the first fin.

At this time, the first fins may be formed along the diagonal line of the base portion, may be formed non-parallel to the arrangement direction of the light sources in the light source unit, or the first fins may be lower than the surrounding fins. It is preferable to form so as to include a notch.

Further, a vehicle lamp according to the present disclosure is equipped with the above lamp unit.

According to the lighting unit and vehicle lighting device of the present disclosure, the second fins formed non-parallel to the first fins direct the airflow that does not enter the heat sink or the airflow that leaks from the heat sink toward the heat source inside the heat sink. can send. Therefore, it is possible to improve the cooling performance of the heat sink while suppressing the size of the heat sink.

1 is a schematic cross-sectional view of a vehicle lamp showing an embodiment of the present disclosure; FIG. (a) A schematic diagram showing a conventional heat sink, (b) an enlarged view of a main part of a configuration in which second fins are formed. FIG. 4A is a schematic diagram showing a configuration in which the first fins are formed along a diagonal line, and FIG. 4B is a schematic diagram showing a configuration in which the first fins are formed so as to be perpendicular to the arrangement of the light sources. (a) A conventional heat sink, (b) It is a schematic diagram which shows the structure which formed the notch part in the 1st fin. It is a schematic diagram which shows the variation of a notch part. 1 is a schematic diagram showing the best configuration of a heat sink; FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present disclosure is embodied in a vehicle headlamp will be described below with reference to the drawings. In the following description, FIGS. 2 to 4 and 6 show schematic diagrams of the heat sink 2 when viewed from the rear side of the vehicle lamp 51. FIG.

A vehicle lamp 51 shown in FIG. 1 includes a lamp body 52 attached to a vehicle body and a translucent cover 53 made of a transparent resin material. is equipped with a lamp unit 1.

The lamp unit 1 includes a light source unit 3 mounted with a plurality of light emitting elements (LEDs 31), a heat sink 2 supporting the light source unit 3, a fan 4 blowing air to the heat sink 2 to dissipate the heat of the heat sink 2, and light from the LEDs 31. to the outside of the vehicle.

The heat sink 2 is integrally formed of a metal material with good thermal conductivity, and includes a base portion 23 for mounting the light source unit 3 on a back surface 23b (see FIG. 5A) and a plurality of heat sinks formed on a front surface 23a of the base portion 23. A first fin 21 and a second fin 22 are provided. Moreover, the heat sink 2 cools the heat (heat source H) generated especially from the LEDs 31 arranged in series in the light source unit 3 . The fin 21 is formed so as to protrude toward the rear side of the lamp from the surface 23a of the base portion 23 as a base end. The fan 4 is arranged on the rear side of the lamp from the heat sink 2 and at a position facing the fins 21 .

As shown in FIG. 2A, in the conventional heat sink 2, the airflow S from the fan 4 hits the first fins 21, generating an airflow S1 directed toward the heat source H and an airflow S2 directed from the inside of the heatsink 2 to the outside. Also, there is an airflow S3 that does not flow into the heat sink 2 . Thus, in the conventional heat sink 2, air currents S2 and S3 not directed toward the heat source H are generated.

As shown in FIG. 2B, by arranging the second fins 22 non-parallel to the first fins 21, the airflows S2 and S3 can be prevented, and the heat sink 2 can be efficiently cooled.

At this time, the second fins 22 are preferably inclined with respect to the first fins 21 by about 15 to 45 degrees in order to allow the airflows S2 and S3 to flow into the first fins 21 more efficiently. Further, the end portion 22a of the second fin 22 may be arranged so as to contact the end portion 21b of the outermost first fin 21 . In addition, the length of the first fin 21 is adjusted, and the distance D between the first fin 21 and the second fin 22 is provided so as to gradually narrow as the end 22a of the second fin 22 is approached. It is also possible to configure the airflows S2 and S3 to flow into the first fins.

In the example of FIG. 3( a ), the first fin 21 is formed along the diagonal 23 d of the substantially rectangular base portion 23 . By forming the first fins 21 in this way, the length L of the first fins 21 can be extended and the number of the first fins 21 can be increased. The cooling efficiency of the heat sink 2 can be improved. In this example, the first fins 21 are formed along the diagonal line 23d, but they may be inclined at a predetermined angle so as not to be parallel to the side 23c. Even when provided in this way, it is possible to increase the total area of the first fins 21 compared to when provided parallel to the side 23c.

In the example of FIG. 3B, the first fins 21 are formed non-parallel to the direction in which the LEDs 31 are arranged. In particular, it is preferable to form the first fin 21 so as to be perpendicular to the arrangement direction of the LEDs 31 . By forming the first fins 21 in this way, a large number of first fins 21 (hatched first fins 21) can be arranged so as to intersect with the heat source H, and the heat source H can be cooled more efficiently. can.

As shown in FIG. 4A, in the conventional heat sink 2, the airflow S4 in the direction perpendicular to the first fins 21 is blocked by the first fins 21 and cannot be used for cooling.

In the example of FIG. 4B, the first fin 21 is formed with a notch 21a along the airflow S of the fan 4, the height of the fin being lower than the surroundings. By forming the cutout portion 21a along the airflow S of the fan 4 in the first fin 21, the airflow S4 can pass through the cutout portion 21a, so that the cooling efficiency of the heat sink 2 can be improved. The notch 21a has a U-shape (FIG. 5(a)), a U-shape (FIG. 5(b)), a V-shape (FIG. 5(c)), or a slit shape (FIG. 5(d)). It is possible to form

A preferred configuration of the heat sink 2 is illustrated in FIG. In the example of FIG. 6, all of the second fins 22 (221 to 224) are arranged in four directions. Alternatively, any three of the second fins 221 to 224 may be arranged. Also, the number and inclination of the second fins 22 can be adjusted according to the direction of the wind from the fan 4 .

In the example of FIG. 6A, the first fin 21 is formed along the diagonal line 23d, and the second fins 221 to 224 are arranged in the outer peripheral region A surrounding the first fin 21. In the example of FIG. Here, the outer peripheral region A indicates the outer peripheral portion of the surface 23a of the base portion 23, in which the first fins 21 are arranged. By providing the first fins 21 and the second fins 22 in this way, the total area of the first fins 21 is increased and the wind of the fan 4 is guided to the heat source H, so that the heat source H can be cooled more efficiently. It becomes possible. In addition, since the first fins 21 are provided non-parallel to the arrangement direction of the LEDs 31, there is also an effect that a large number of the first fins 21 can be arranged by the heat source H.

In the example of FIG. 6B, the first fin 21 is formed in a direction perpendicular to the direction in which the LEDs 31 are arranged, and the second fins 221 to 224 are arranged in the outer peripheral region A. In the example of FIG. By providing the first fins 21 and the second fins 22 in this way, a large number of the first fins 21 are arranged so as to intersect with the heat source H, thereby increasing the cooling efficiency and guiding the wind of the fan 4 to the heat source H. The heat source H can be cooled more efficiently.

In the example of FIG. 6(c), the first fin 21 is formed with a notch 21a along the airflow S of the fan 4, and the second fins 221 to 224 are arranged in the outer peripheral region A. In the example of FIG. By providing the first fin 21 and the second fin 22 in this way, the wind from the fan 4 is smoothly led to the heat source H without being blocked by the first fin 21, and the heat source H is cooled more efficiently. becomes possible.

Therefore, according to the lamp unit 1 and the vehicle lamp 51 of this embodiment, the direction of the first fin 21 is adjusted, the first fin 21 is provided with the notch 21a, and the first fin 21 is provided with a fan. Since the second fins 22 for guiding the air from the fan 4 are provided, the air from the fan 4 is efficiently guided to the heat source H, and the heat of the light source unit 3 can be dissipated without increasing the size of the heat sink 2 itself.

It should be noted that the present disclosure is not limited to the above-described embodiments, and it is also possible to change the shape and configuration of each part as appropriate without departing from the gist of the present disclosure. For example, instead of mounting a plurality of light emitting elements, the light source unit 3 is mounted with a single light emitting element, or the light source unit 3 is mounted with a single elongated light emitting element. It is also possible to form the fins 21 non-parallel.

REFERENCE SIGNS LIST 1 lamp unit 2 heat sink 3 light source unit 4 fan 5 projection lens 21 first fin (a: notch, b: end)
22 second fin (a: end)
23 base part (a: front surface, b: back surface, c: side, d: diagonal line)
31 LEDs
51 Vehicle lamp 52 Lamp body 53 Translucent cover 54 Lamp chamber L Length A Peripheral region H Heat source S Airflow

Claims (6)

a light source unit equipped with a plurality of light emitting elements;
a heat sink supporting the light source unit;
a fan that blows air to the heat sink to dissipate the heat of the heat sink;
A lighting unit comprising
The heat sink includes a base portion on which the light source unit is placed on the back surface, and a plurality of fins formed on the surface of the base portion,
A lighting unit, wherein the fins include a plurality of first fins formed substantially parallel to each other and second fins formed non-parallel to the first fins. The lamp unit according to claim 1, wherein the first fins are formed along a diagonal line of the base portion. 3. The lamp unit according to claim 1, wherein the first fin is formed non-parallel to the direction in which the light sources are arranged in the light source unit. The lamp unit according to any one of claims 1 to 3, wherein the first fin includes a notch portion in which the height of the fin is lower than the surroundings. The lamp unit according to any one of claims 1 to 4, wherein the second fins are arranged in a part of the outer peripheral region surrounding the first fins. A vehicle lamp equipped with the lamp unit according to any one of claims 1 to 5.

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