JP6814069B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp.

In recent years, the number of light emitting diodes (LEDs) that use LEDs as a light source is gradually increasing as the brightness and cost of light emitting diodes (LEDs) become higher and lower. LEDs have the advantages of long life and low power consumption. On the other hand, when the temperature becomes high, the luminous efficiency is lowered and the life is shortened. Therefore, it is necessary to efficiently dissipate the heat generated by the LED to the outside by using a heat sink or the like (see, for example, Patent Document 1 below). ..

For example, Patent Document 1 below discloses a vehicle lamp in which a holder member to which a semiconductor light source is attached is attached to a heat sink by screwing, and a reflector is attached to the heat sink by screwing.

Japanese Patent No. 5630360

However, in the vehicle lighting equipment described in Patent Document 1 described above, since the holder member and the reflector are separately attached to the heat sink by screwing, not only the number of parts increases but also the assembly man-hours increase.

Further, the direction in which the reflector is screwed to the heat sink is different between the front side and the upper surface side of the heat sink. In this case, it is difficult to simplify the assembly process because it is impossible to assemble (screw) from one direction.

The present invention has been proposed in view of such conventional circumstances, and provides a vehicle lamp that enables further cost reduction by reducing the number of parts and simplifying the assembly process. The purpose is.

In order to achieve the above object, the present invention provides the following means.
[1] Light source and
A substrate on which the light source is mounted on one side,
A heat sink that dissipates heat generated by the light source in contact with the other surface side of the substrate.
A housing provided with an opening through which the light emitted from the light source passes and a reflecting portion for reflecting the light passing through the opening toward the front is provided.
The substrate is arranged in a state of being positioned on one surface of the housing so that the light source faces the opening.
The heat sink is said to be in a state in which a locking portion provided on one end side thereof is locked to a locked portion provided on the housing while sandwiching the substrate between the heat sink and one surface of the housing. A vehicle lamp that is fixed to a fixing portion provided on one surface of the housing through a through hole that penetrates a substrate.
[2] The fixing portion has a boss that protrudes from one surface of the housing through the through hole, and a screw hole provided at the tip of the boss.
The heat sink is characterized in that it has a hole at a position facing the screw hole and is fixed to the fixed portion by screwing a screw into the screw hole through the hole. The vehicle lamp according to [1].
[3] The heat sink has a base portion in contact with the substrate and a plurality of fin portions formed so as to rise side by side in the same direction from a surface of the base portion opposite to the surface facing the substrate. The vehicle lighting equipment according to the above [1] or [2].
[4] The locking portion is provided on one end side of the base portion in the direction in which the plurality of fin portions are arranged.
The hole portion is recessed on the side facing the substrate with respect to a part of the base portion in the direction in which the plurality of fin portions are lined up in the extending direction of the fin portion, and the side opposite to the fin portion is projected. The vehicle lighting fixture according to the above [3], which is provided on a seat surface portion.
[5] The housing has a plurality of positioning protrusions protruding from the one surface.
The substrate has a plurality of positioning recesses that cut out its end face in the thickness direction.
The vehicle according to the above [3] or [4], wherein the substrate is positioned on one surface of the housing by engaging the positioning convex portion and the positioning concave portion with each other. Lighting equipment.
[6] The heat sink is characterized by having a relief recess in which a position facing the positioning convex portion is recessed in the extension direction of the fin portion on a surface of the base portion facing the substrate. The vehicle lighting fixture according to [5].
[7] The vehicle lamp according to any one of [3] to [6] above, wherein the heat sink is made of an extruded product.
[8] The vehicle lamp according to any one of the above [1] to [7], wherein the housing is a reflector.

As described above, according to the present invention, it is possible to provide a vehicle lamp that enables further cost reduction by reducing the number of parts and simplifying the assembly process.

It is an exploded perspective view which shows the structure of the lamp for vehicle which concerns on one Embodiment of this invention. It is sectional drawing which shows the structure of the vehicle lamp shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easier to see, the scale of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual one. Make it not exist.

As an embodiment of the present invention, for example, the vehicle lamp 1 shown in FIGS. 1 and 2 will be described. Note that FIG. 1 is an exploded perspective view showing the configuration of the vehicle lamp 1. FIG. 2 is a cross-sectional view showing the configuration of the vehicle lamp 1 shown in FIG. Further, in the drawings shown below, the XYZ Cartesian coordinate system is set, the X-axis direction is the front-rear direction of the vehicle lighting tool 1, the Y-axis direction is the left-right direction of the vehicle lighting tool 1, and the Z-axis direction is the vertical direction of the vehicle lighting tool 1. The directions shall be indicated respectively.

As shown in FIGS. 1 and 2, the vehicle lamp 1 of the present invention applies the present invention to, for example, a vehicle headlamp that irradiates light toward the front (+ X-axis direction) of the vehicle. It was done. Further, in the present embodiment, as shown in FIG. 1, one vehicle headlight is housed inside a lamp body (not shown) in a state where a single lamp or a plurality of vehicle lamps 1 are combined. It constitutes a light. Since each vehicle lamp 1 has basically the same configuration, as shown in FIG. 2, one vehicle lamp 1 will be taken as an example to explain its configuration and the like. To do.

The vehicle lamp 1 of the present embodiment is in contact with the light source 2, the substrate 3 on which the light source 2 is mounted on one surface (lower surface in this embodiment), and the other surface (upper surface in this embodiment) of the substrate 3. In this state, it includes a heat sink 4 that dissipates heat generated by the light source 2, and a housing 5 to which the substrate 3 and the heat sink 4 are attached.

The light source 2 includes, for example, a chip LED (SMD LED) that emits white light. Further, as the chip LED, a high output type for vehicle lighting is used. The number of light sources 2 is not limited to one, and may be plural. Further, the color of the light emitted by the light source 2 is not limited to the white light described above, and can be appropriately changed depending on the use of the vehicle lamp 1 such as orange light and red light. Further, as the light source 2, in addition to the chip LED described above, a light emitting element that can be mounted on a substrate 3 such as a laser diode (LD) can be used.

The substrate 3 is composed of a rectangular printed wiring board (PWB) provided with wiring (not shown) electrically connected to the light source 2 on at least one surface thereof. The substrate 3 is provided with a circular through hole 6 penetrating the substrate 3 and a plurality of (four in this embodiment) positioning recesses 7 whose end faces are cut out in a semicircular shape in the thickness direction. ..

The through hole 6 is provided at a substantially central portion of the substrate 3 at a position separated in the longitudinal direction from the position where the light source 2 is mounted. Two of the plurality of positioning recesses 7 are provided side by side at positions facing each other on both end faces along the longitudinal direction of the substrate 3.

Although not shown in the vehicle lighting fixture 1, a circuit board provided with a drive circuit for driving the light source 2 is prepared separately from the substrate (mounting substrate) 3 on which the light source 2 is mounted, and these substrates 3 are provided. And the circuit board are electrically connected via a wiring cord called a harness to protect the drive circuit from the heat generated by the light source 2.

The heat sink 4 is made of an extruded product made of a metal such as aluminum having high thermoconductivity. The heat sink 4 is arranged in the same direction (in the present embodiment, the longitudinal direction of the base portion 8) from the surface (upper surface) opposite to the surface (lower surface) of the rectangular base portion 8 facing the substrate 3 of the base portion 8. It has a plurality of fin portions 9 formed so as to stand side by side. The base portion 8 is a portion that comes into contact with the substrate 3, and the plurality of fin portions 9 are portions that dissipate heat transferred from the substrate 3 to the base portion 8 to the outside. In the heat sink 4, it is possible to improve heat dissipation by increasing the surface area with the plurality of fin portions 9.

Further, a locking portion 10 is provided on one end side in the direction (longitudinal direction) in which the plurality of fin portions 9 of the base portion 8 are arranged. The locking portion 10 is a portion to be locked to the locked portion 17 of the housing 5 described later, and is composed of a portion protruding outward from the fin portion 9 on one end side of the base portion 8.

The heat sink 4 has a circular hole 11 at a position facing the through hole 6 of the substrate 3 described above. The hole portion 11 is provided in the seat surface portion 12. The seat surface portion 12 is on the side facing the substrate 3 over the extension direction of the fin portion 9 (the lateral direction of the base portion 8) with respect to a part of the direction (longitudinal direction) in which the plurality of fin portions 9 of the base portion 8 are arranged. Is dented in a rectangular cross section, and the opposite side is projected in a rectangular cross section.

The heat sink 4 has a relief recess 13 at a position facing the positioning protrusion 20 of the housing 5, which will be described later. The relief recess 13 is for releasing the positioning convex portion 20 protruding from one surface of the housing 5, and the surface of the base portion 8 facing the substrate 3 has a rectangular cross section over the extension direction of the fin portion 9. It consists of a dented part.

The heat sink 4 has a grease groove 14 on the surface of the base portion 8 facing the substrate 3. The grease groove 14 prevents the heat conductive grease from leaking from the periphery of the position where it overlaps with the light source 2 when the heat sink 4 is arranged in contact with the substrate 3 via the heat conductive grease (not shown). Is for. The grease groove 14 is composed of a pair of groove portions 14a notched on both sides of the position where the light source 2 overlaps with each other in the extending direction of the fin portion 9, and a recess 14b having a slight (about 0.1 mm) recess between them. Has been done.

The heat sink 4 of the present embodiment is manufactured as an extruded product in a batch by extruding the extruded product along the extension direction of the fin portion 9 (the lateral direction of the base portion 8) and cutting it to a predetermined length. Is possible. This makes it possible to reduce the manufacturing cost of the heat sink 4.

The housing 5 constitutes a reflector that reflects the light emitted from the light source 2 toward the front, and is made of a box-shaped resin molded product having an open front side. The housing 5 has an opening 15 through which the light emitted from the light source 2 passes, and a reflecting portion 16 for reflecting the light passing through the opening 15 forward.

The opening 15 is provided on the rear side of one surface (upper surface) of the housing 5. The reflecting portion 16 has a cross section (X-axis cross section) along the front-rear direction (X-axis direction) of the housing 5, from the base end (rear end) side to the tip end (front end) side of the center of the light source 2. It is formed to be curved from the side (lower side) opposite to one surface of the housing 5 so as to draw a parabola with the light emitting point) as the focal point. The reflecting portion 16 is provided with a reflective film such as aluminum on the inner surface of the housing 5, so that the reflecting surface 16a reflects the light emitted from the light source 2 toward the front. In the present embodiment, the reflective portion 16 is integrally configured with the housing 5, but the reflective portion (reflective member) 16 configured separately from the housing 5 is integrally attached to the housing 5. It is also possible to configure it.

The housing 5 is provided with a locked portion 17 to which the locking portion 10 of the heat sink 4 described above is locked. The locked portion 17 is located on the front end side of one surface of the housing 5, and includes a slit that linearly cuts out a part of the housing 5 according to the shape of the locking portion 10 of the heat sink 4.

Further, a fixing portion 18 for fixing the heat sink 4 is provided on one surface of the housing 5. The fixing portion 18 has a boss 19 projecting from one surface of the housing 5 in a substantially columnar shape, and a screw hole 19a provided at the tip of the boss 19. The boss 19 (fixed portion 18) is provided on the rear side of the position where the opening 15 of the housing 5 is formed.

Further, a plurality of (two in this embodiment) positioning convex portions 20 are provided on one surface of the housing 5 so as to project. The plurality of positioning convex portions 20 are located on the front side of the position where the opening 15 of the housing 5 is formed, and are provided side by side in the width direction (Y-axis direction) of the housing 5. It should be noted that the positioning recesses 7 are arranged in pairs (two) more than the positioning protrusions 20, but this is in consideration of the versatility of the substrate 3. That is, by providing a plurality of positioning recesses 7 at predetermined positions on the substrate 3 in advance, it is possible to use a common substrate 3 among different models.

In the vehicle lamp 1 having the above configuration, first, two positioning protrusions 20 provided on one surface of the housing 5 are provided in two positioning recesses 7 among the four positioning recesses 7 provided on the substrate 3. To engage. As a result, the substrate 3 is positioned on one surface of the housing 5 so that the light source 2 faces the opening 15 of the housing 5. Further, at this time, the boss 19 provided on one surface of the housing 5 is in a state of penetrating the through hole 6 of the substrate 3.

Next, from this state, the heat sink 4 is arranged in contact with the substrate 3 via the heat conductive grease. Specifically, while sandwiching the substrate 3 between one surface of the housing 5 and the heat sink 4, the locking portion 10 provided on one end side of the heat sink 4 is provided in the housing 5. The locking portion 10 is locked to the locked portion 17 by being inserted into.

Next, from this state, the screw 21 is screwed into the screw hole 19a of the boss 19 through the hole 11 of the heat sink 4. As a result, the heat sink 4 can be fixed to the fixing portion 18 provided on one surface of the housing 5 through the through hole 6 penetrating the substrate 3.

As described above, in the vehicle lamp 1 of the present embodiment, the substrate 3 and the heat sink 4 can be attached to one surface of the housing 5 with one screw 21. In addition, it can be assembled (screwed) from one direction. Therefore, in the vehicle lamp 1 of the present embodiment, it is possible to further reduce the cost by reducing the number of parts and simplifying the assembly process.

Further, in the vehicle lamp 1 of the present embodiment, the substrate 3 is not fixed to one surface of the housing 5 by screwing, and the substrate 3 is sandwiched between one surface of the housing 5 and the heat sink 4. Have been placed. This makes it possible to keep the stress applied to the substrate 3 low during mounting.

The present invention is not necessarily limited to that of the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the fixing portion 18 is provided with a boss 19 penetrating the through hole 6 of the substrate 3, but the present invention is not limited to such a configuration, and for example, a hole provided in the heat sink 4. It is also possible to attach the screw 21 to the screw hole provided on one surface of the housing 5 by screwing through the through hole 6 of the substrate 3 from the portion. That is, in the vehicle lamp 1 of the present embodiment, in order to avoid applying stress to the substrate 3 described above, the heat sink 4 is placed on the fixing portion 18 provided on one surface of the housing 5 through the through hole 6 penetrating the substrate 3. It may be configured to fix.

In the above embodiment, the case where the present invention is applied to the above-mentioned vehicle headlights (headlamps) has been illustrated. For example, vehicle side lights (position lamps), auxiliary headlights (sub-headlamps), and the like. For vehicle lighting equipment such as front fog lamps, daytime running lamps, lid lamps, tail lamps, brake lamps (stop lamps), back lamps, turn signals (winker lamps) On the other hand, the present invention can be widely applied.

1 ... Vehicle lighting 2 ... Light source 3 ... Board 4 ... Heat sink 5 ... Housing 6 ... Through hole 7 ... Positioning recess 8 ... Base part 9 ... Fin part 10 ... Locking part 11 ... Hole part 12 ... Seat surface part 13 ... Escape Concave part 14 ... Grease groove 15 ... Opening 16 ... Reflecting part 17 ... Locked part 18 ... Fixed part 19 ... Boss 19a ... Screw hole 20 ... Positioning convex part 21 ... Screw

Claims (8)

Light source and
A substrate on which the light source is mounted on one side,
A heat sink that dissipates heat generated by the light source in contact with the other surface side of the substrate.
A housing provided with an opening through which the light emitted from the light source passes and a reflecting portion for reflecting the light passing through the opening toward the front is provided.
The substrate is arranged in a state of being positioned on one surface of the housing so that the light source faces the opening.
The heat sink is said to be in a state in which a locking portion provided on one end side thereof is locked to a locked portion provided on the housing while sandwiching the substrate between the heat sink and one surface of the housing. A vehicle lamp that is fixed to a fixing portion provided on one surface of the housing through a through hole that penetrates a substrate. The fixing portion has a boss that protrudes from one surface of the housing through the through hole, and a screw hole provided at the tip of the boss.
A claim characterized in that the heat sink has a hole at a position facing the screw hole and is fixed to the fixed portion by screwing a screw into the screw hole through the hole. Item 1. The vehicle lighting equipment according to item 1. The heat sink is characterized by having a base portion in contact with the substrate and a plurality of fin portions formed so as to rise side by side in the same direction from a surface of the base portion opposite to the surface facing the substrate. The vehicle lighting equipment according to claim 1 or 2. The locking portion is provided on one end side of the base portion in the direction in which the plurality of fin portions are arranged.
The hole portion is recessed on the side facing the substrate with respect to a part of the base portion in the direction in which the plurality of fin portions are arranged, and the side opposite to the fin portion is projected. The vehicle lamp according to claim 3, wherein the lamp is provided on a seat surface. The housing has a plurality of positioning protrusions protruding from the one surface.
The substrate has a plurality of positioning recesses that cut out its end face in the thickness direction.
The vehicle lamp according to claim 3 or 4, wherein the substrate is positioned on one surface of the housing by engaging the positioning convex portion and the positioning concave portion with each other. The fifth aspect of the present invention is characterized in that the heat sink has a relief recess in which a position facing the positioning convex portion is recessed in the extension direction of the fin portion on a surface of the base portion facing the substrate. The vehicle lighting equipment described. The vehicle lamp according to any one of claims 3 to 6, wherein the heat sink is made of an extruded product. The vehicle lamp according to any one of claims 1 to 7, wherein the housing is a reflector.

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