JP2007173034A - Light-emitting device of vehicular lighting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device of a lighting tool for a vehicle with compatibility with a conventional one using a glass bulb, and having a light-emitting element enabled to efficiently radiate heat in a simple structure. <P>SOLUTION: Of the light-emitting device 10 for a vehicle lighting tool, consisting of a socket part 11, a support body 12 extended from the socket part in a direction of a light axis, and a plurality of light-emitting elements 13 mounted on a peripheral face around the light axis of the support body, the support body 12 is structured of heat pipes, and the light-emitting device for the vehicle lighting tool is so structured that each light-emitting element 13 is positioned at nearly the same level as a light-emitting part of a bulb standard. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bulb-shaped light emitting device for a vehicle lamp such as a vehicle headlamp used as a headlamp or an auxiliary headlamp provided at the front of an automobile, for example.

2. Description of the Related Art Conventionally, for example, a valve for a vehicle headlamp of an automobile is configured as shown in FIG.
That is, in FIG. 7, a headlight bulb 1 includes a tube-shaped glass bulb 2 having one end opened, a socket portion 3 that closes the open end of the glass bulb 2, and a vacuum-evacuated interior of the glass bulb 2. The light emitting section 4 is arranged along the central axis and supported by the socket section 3, and is known as a bulb of various standards such as H11.

According to the headlight bulb 1 having such a configuration, the socket portion 3 is mounted by being inserted into the connector 5 on the vehicle body side of the automobile, and power is supplied to the light emitting portion 4 through the socket portion 3. Thus, the light emitting unit 4 emits light, and light is emitted outside through the glass bulb 2.
A discharge lamp such as D2S using arc discharge instead of the filament is also known.

  And in vehicle headlamps, such as a headlight using such a headlight bulb 1, by setting a reflective surface on the basis of the light emitting part by the filament of the headlight bulb 1, it is possible to travel at night or the like. A suitable light distribution pattern is irradiated toward the front of the vehicle in the traveling direction.

  On the other hand, in recent years, various light emitting devices utilizing light emitting diodes (LEDs) as light emitters have been developed from the viewpoint of energy efficiency. As shown in Patent Documents 1 to 3, a plurality of LEDs, etc. Various light-emitting devices including these light-emitting elements are disclosed.

  A light-emitting device with a socket according to Patent Document 1 includes a light-emitting body composed of a plurality of light-emitting elements held on a holding plate attached to the socket, and a translucent material fixed to the socket so as to cover these light-emitting bodies And a cap. According to such a light emitting device with a socket, by supplying power to each light emitting element of the light emitter, each light emitting element is driven to emit light, and light is emitted to the outside through a cap.

By the way, in the light emitting device with a socket according to Patent Document 1, since the heat generation of each light emitting element is very small, no heat dissipation measures for the light emitter are taken.
However, when the light emitting device with a socket is used as a light source for an automobile headlight or the like, the current consumption of each light emitting element is relatively large in order to obtain the required light intensity. The temperature rises, and the light emission efficiency of each light emitting element whose light emission efficiency changes depending on the temperature is lowered.

On the other hand, Patent Documents 2 and 3 disclose LED lamps with measures for heat dissipation.
In the LED lamp according to Patent Document 2, a heat conductive flange that spreads relatively large is thermally connected to a heat conduction column supporting a plurality of LEDs, and heat generated from each LED is transferred from the heat conduction column to the flange. It transmits and dissipates heat from the flange to the outside air.

In addition, the LED lamp according to Patent Document 2 is configured to include, for example, a bulb-type base as a socket, and an LED as a light emitting element is formed by a hollow cylindrical support member that is thermally connected to the base. The mounting substrate is supported, and the internal air convection due to the heat generated by each LED flows in the hollow portion of the support member toward the base, so that the mounting substrate is cooled and the LEDs are radiated. It has become.
JP 2002-157914 A Japanese Patent Application Laid-Open No. 2004-006297 JP 2004-296245 A

  However, in the LED lamps according to Patent Documents 2 and 3, in order to dissipate the heat generated by the LED, cooling is performed by heat dissipation by the flange or air flow in the hollow portion of the support member. Therefore, in any case, since the heat dissipation is natural, the heat dissipation effect is relatively small. For example, when an LED lamp is used as a headlamp of an automobile, the current consumption of the LED increases, so the LED May rise.

Moreover, in the LED lamp by patent document 2, since the flange has protruded large outside, while the whole LED lamp will enlarge, it is difficult to comprise so that it may be compatible with the bulb | ball by the conventional glass bulb | ball. It is.
In this case, the compatibility of the bulb is not limited to the shape of the socket, but corresponds to the bulb by the glass bulb by arranging the light emitting element at the same position as the light emitting portion (filament) in the bulb by the conventional glass bulb with respect to the socket. With respect to a vehicle headlamp having an optical system such as a reflecting surface and a projection lens designed in this way, it is important that the same light distribution pattern can be formed when mounted instead of a bulb of glass sphere.

  On the other hand, a light emitting device provided with cooling means such as a Peltier element and a fan-type air cooling device is also conceivable, but none of them has sufficient cooling efficiency, and the temperature of the light emitting element is increased, or the light emitting device. Will become larger.

  In light of the above, an object of the present invention is to provide a light emitting device for a vehicular lamp that has a simple configuration and is compatible with a conventional bulb made of glass spheres, and in which a light emitting element can efficiently dissipate heat. It is said.

  According to the present invention, the above object is achieved by a vehicle comprising a socket portion, a column body extending from the socket portion in the optical axis direction, and a plurality of light emitting elements mounted on the peripheral surface of the optical axis of the column body. A light-emitting device for a headlamp, wherein the support body is composed of a heat pipe, and each light-emitting element is disposed on the peripheral surface of the support body at substantially the same position as the bulb-standard light-emitting portion. This is achieved by a light-emitting device for a vehicle headlamp.

  In the vehicular lamp light emitting device according to the present invention, preferably, the surface of the heat pipe constituting the support column is coated so as to reduce glare light.

  In the light emitting device for a vehicle lamp according to the present invention, preferably, the heat pipe constituting the support body extends through the socket to the outside.

  In the light emitting device for a vehicular lamp according to the present invention, a light shielding member for forming a cut-off is preferably attached to the distal end side of the column body.

  In the light emitting device for a vehicle lamp according to the present invention, preferably, the heat pipe constituting the support body is formed in a regular polygonal column shape or a flat plate shape, and a light emitting element is mounted on at least one side surface thereof.

  In the light emitting device for a vehicle lamp according to the present invention, it is preferable that some of the light emitting elements can be selectively lit and a cutoff can be formed by selective lighting.

According to the above configuration, when each light emitting element is supplied with power through the socket portion, each light emitting element is driven to emit light and output to the outside.
And since the support | pillar body which supports each light emitting element is comprised from the heat pipe, the heat | fever which generate | occur | produced in each light emitting element can be thermally radiated efficiently through this support | pillar body. Therefore, since each light emitting element is sufficiently cooled, the light emission efficiency is not lowered by the temperature rise.

  In this case, since the light-emitting element is arranged at substantially the same position as the bulb-standard light-emitting portion with respect to the socket portion, the light-emitting device is a glass bulb type bulb for a vehicle headlamp such as a headlamp of an automobile. Instead, when it is attached to the connector on the vehicle body side, light is emitted from substantially the same position as the filament in the conventional glass bulb type bulb.

Therefore, the light from each light emitting element of the light emitting device is reflected forward by using the reflecting surface of the vehicle headlamp designed for the glass bulb type bulb as it is, and directly or once collected. A predetermined light distribution pattern can be formed through the projection lens.
In this way, according to the present invention, a light-emitting device that is completely compatible with a conventional glass bulb type bulb can be realized, so that the front of the vehicle designed for the conventional glass bulb type bulb can be realized. The power consumption can be reduced just by mounting the light emitting device as it is without any modification to the lighting lamp, and a light emitting device with a long life can be used by highly efficient cooling of the light emitting element. .

  When the surface of the heat pipe constituting the column body is coated so as to reduce glare light, the light emitted from each light emitting element is reflected on the surface of the heat pipe constituting the column body, It is not emitted to the outside as glare light.

  When the heat pipes constituting the support columns extend through the socket to the outside, the heat transferred from the light emitting elements to the heat pipes is radiated to the outside through the heat pipes. The heat dissipation efficiency will increase.

  When a light shielding member for forming a cut-off is attached to the front end side of the column body, a cutoff line for controlling a light distribution pattern is formed by the light shielding member with respect to light emitted from each light emitting element. Will be.

  When the heat pipe constituting the column is formed in a regular polygonal column shape or a flat plate shape, and the light emitting element is mounted on at least one side surface thereof, each light emitting element emits from each side surface. Thus, light distribution characteristics in a desired direction corresponding to a conventional glass sphere or the like can be realized.

  When a part of the light emitting elements can be selectively lit and a cut-off can be formed by selective lighting, the light blocking member is controlled by selective lighting control of each light emitting element. A cut-off line can be formed without using the.

  Thus, according to the present invention, a light-emitting device for a vehicle lamp that has a simple configuration and is compatible with a conventional bulb made of glass bulbs and that can efficiently dissipate heat from the light-emitting element can be obtained. It will be.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

[Example 1]
1 to 3 show the configuration of a first embodiment of a light emitting device for a vehicle headlamp according to the present invention.
In FIG. 1, a light emitting device 10 for a vehicle headlamp includes a socket portion 11, a column body 12 extending from the socket portion in the optical axis direction, and a plurality of light emitting elements 13 mounted on the surface of the column body 12. , Is composed of.

  The socket portion 11 has the same configuration as a conventional glass bulb type bulb, and includes two connection terminals (see FIG. 3) 11a having a predetermined bulb standard.

The column body 12 has a flat plate shape extending from the socket portion 11 in the optical axis direction, and a plurality of (in the illustrated case, four) light emitting elements 13 are mounted on both surfaces thereof. Yes.
Moreover, the said support | pillar body 12 is comprised from the heat pipe as a whole.
The heat pipe is preferably provided with an extra fine wire wick to increase the amount of heat transport.

Furthermore, the surface of the support body 12 is painted black, for example. As a result, it is possible to prevent the light from the light emitting element 13 from being reflected on the support 12, that is, the surface of the heat pipe, and becoming glare light.
In addition, the said support | pillar body 12 may be exposed to the end surface which penetrates the socket part 11 and the terminal 11a protrudes. Thereby, the heat dissipation effect by the heat pipe can be increased.

Each of the light emitting elements 13 is composed of a light emitting element such as an LED, for example, and is mounted on the surface of the support body 12 so that light is emitted in a direction substantially perpendicular to the optical axis.
At that time, each light emitting element 13 is arranged on the support column 12 at substantially the same position as a light emitting portion of a predetermined bulb standard, for example, a filament.

Specifically, each light emitting element 13 is arranged in a straight line, for example, in a range of 0.1 to 1.5 mm in width and 0.5 to 4.5 mm in length, for example, in a line in the optical axis direction. Yes.
Further, each light emitting element 13 is preferably about the focal position of the reflection surface of the vehicle headlamp, in the case of a traveling beam, in the vicinity of the focal position, and in the case of a passing beam, around 5.0 mm ± before and after the focal position. It arrange | positions in the range of 0.5 mm.
Each light emitting element 13 is driven and emits light by being fed through the terminal 11a of the socket part 11 described above.

The light emitting device 10 for a vehicle headlamp according to the embodiment of the present invention is configured as described above. When used, the connector 14 is used for a conventional vehicle headlamp for a glass bulb type bulb. The terminal 11a of the socket part 11 is inserted into (see FIG. 1) to be attached.
Then, when power is supplied from the socket portion 11 to each light emitting element 13, each light emitting element 13 is driven to emit light.

As a result, the light emitted from each light emitting element 13 is incident on the reflecting surface of the vehicle headlamp and reflected in a predetermined direction, either directly or once after being focused and then forward. Irradiated towards.
In this case, each light emitting element 13 in the present light emitting device 10 is disposed at substantially the same position as the light emitting portion of the conventional glass bulb type bulb, and is compatible with the glass bulb type bulb. The light from the light emitting element 13 enters the reflective surface of the vehicle headlamp almost as designed.

As a result, the light reflected by the reflecting surface is irradiated forward in a substantially predetermined light distribution pattern.
Therefore, this light emitting device is mounted on a vehicle headlamp designed for a conventional glass bulb type bulb in place of the glass bulb type bulb, so that it is almost the same as the glass bulb type bulb. Light can be irradiated forward with the light distribution pattern.

Further, the heat generated in each light emitting element 13 is transmitted to the surface of the column body 12 and further transported by heat through the heat pipes that constitute the column body 12. As a result, each light emitting element 13 is forcibly cooled with high heat dissipation efficiency based on the heat dissipation effect of the heat pipe, so that the temperature does not increase, and therefore the light emission efficiency decreases due to the temperature increase. Can be suppressed.
In this case, since the heat pipe for heat dissipation is configured as a support body, the entire light-emitting device is not enlarged, so that compatibility with a glass bulb type bulb is impaired. There is nothing.

Furthermore, in practice, with respect to the focal position of the reflection surface of the vehicle headlamp, the position of each light-emitting element 13 is shifted in the left-right direction by a distance corresponding to half the thickness of the column 12, so that A light distribution pattern that is slightly spread out can be obtained.
Further, the reflection surface of the vehicle headlamp may be formed so that the light emitting element 13 mounted on each side surface is a focal position in a region corresponding to each side surface of the column body 12.

[Example 2]
FIG. 4 shows the configuration of a second embodiment of the light emitting device for a vehicle headlamp according to the present invention.
In FIG. 4, the light emitting device 20 for the vehicle headlamp has substantially the same configuration as the light emitting device 10 for the vehicle headlamp shown in FIGS. 1 to 3, and therefore the same components are denoted by the same reference numerals. The description is omitted.
The light emitting device 20 of the vehicle headlamp includes a regular hexagonal columnar column body 21 instead of the flat columnar body 12, and a light emitting element 13 is mounted on each side surface of the column body 21. In this respect, the configuration is different from the light emitting device 10 of the vehicle headlamp shown in FIGS.

  According to the light emitting device 20 of the vehicle headlamp having such a configuration, the light from the light emitting element 13 is related to the optical axis while acting in the same manner as the light emitting device 10 of the vehicle headlamp shown in FIGS. Since the light is irradiated in six directions at equal angular intervals, a light distribution pattern closer to a glass bulb type bulb can be obtained.

Further, in practice, with respect to the focal position of the reflection surface of the vehicle headlamp, the positions of the respective light emitting elements 13 are shifted in six directions perpendicular to the respective side surfaces of the column body 21, and thus slightly spread in each direction. A light distribution pattern will be obtained, and a light distribution pattern with a new design will be obtained.
Further, the reflection surface of the vehicle headlamp may be formed so that the light emitting element 13 mounted on each side surface is a focal position in a region corresponding to each side surface of the column body 21.

[Example 3]
FIG. 5 shows a configuration of a third embodiment of the light emitting device for a vehicle headlamp according to the present invention.
In FIG. 5, the light emitting device 30 for the vehicle headlamp has substantially the same configuration as the light emitting device 10 for the vehicle headlamp shown in FIGS. 1 to 3. The description is omitted.
The light emitting device 30 for the vehicle headlamp includes a regular quadrangular columnar column 31 instead of the flat column 12, and the light emitting elements 13 are mounted on the respective sides of the column 31. In this respect, the configuration is different from the light emitting device 10 of the vehicle headlamp shown in FIGS.

Here, each light emitting element 13 is disposed on each side surface of the column body 31 relatively long in the optical axis direction, for example, over a length of about 15 mm.
Each light emitting element 13 is divided into a group 13a near the socket 11 and a group 13b near the tip, and can be lit independently.

  According to the light emitting device 30 for a vehicle headlamp having such a configuration, the light emitting device 10 for the vehicle headlamp shown in FIGS. As a result, the light emitted from the light emitting element 13 is reflected by the reflecting surface of the vehicle headlamp, and is irradiated forward with the light distribution pattern for the traveling beam, and the group 13b is turned on. Thus, the light emitted from the light emitting element 13 is reflected by the reflecting surface of the vehicle headlamp, and is irradiated forward with the light distribution pattern for the passing beam.

This is because, when the light emission center of the light emitting element 13 moves forward with respect to the focal position of the reflection surface of the vehicle headlamp, the reflected light from the reflection surface becomes relatively divergent and the light emission center moves backward. This is because the light reflected by the reflecting surface is relatively focused when moved.
In this way, the light distribution pattern of the traveling beam and the low beam can be switched with a simple configuration without using the light shielding member and without inserting or removing the light shielding member.

[Example 4]
FIG. 6 shows the configuration of the fourth embodiment of the light emitting device for a vehicle headlamp according to the present invention.
In FIG. 6, the vehicle headlamp 40 has substantially the same configuration as the light emitting device 10 of the vehicle headlamp shown in FIG. 1 to FIG. Is omitted.
The light emitting device 40 of the vehicle headlamp includes a relatively large column body 41 instead of the column body 12, and the light emitting elements 13 are arranged in a plurality of rows in the optical axis direction on both surfaces of the column body 41. It is the structure different from the light-emitting device 10 of the vehicle headlamp shown in FIGS.

  Here, the light emitting elements 13 in each column are relatively long along the optical axis direction, for example, are arranged over a length of about 15 mm, and can be lit independently with respect to the other columns. It has become.

  According to the light emitting device 40 for a vehicle headlamp having such a configuration, the light emitting device 10 for the vehicle headlamp shown in FIGS. With respect to the light distribution pattern when the light emitting element 13c emits light, the light distribution pattern when the light emitting element 13d in the upper row emits light is aiming upward by a predetermined angle, for example, about 0.5 degrees, The light distribution pattern when the light emitting elements 13e in the second row emit light is aimed downward by a predetermined angle, for example, about 0.5 degrees. Therefore, an aiming function of a so-called AFS (Active Front-Lighting System) can be realized at a low cost with a simple configuration without providing a movable mechanism for aiming.

In the embodiment described above, the column bodies 12, 21, 31, and 41 are each formed in a flat plate shape, a regular hexagonal column shape, or a regular quadrangular column shape. It may be formed, and a light emitting element may be mounted on at least one of the side surfaces of the regular polygonal column.
A light distribution pattern of a new design is obtained by such a shape of the support body and the arrangement of the light emitting elements.

  In the above-described embodiment, the light-emitting device 30 of the vehicle headlamp divides the light-emitting element 13 into groups 13a and 13b and independently emits light for each group so as to form a cutoff. However, the present invention is not limited to this, and a light-shielding member that blocks a part of the light from the light-emitting element 13 is arranged on the support pillars 12, 21, 31, 41 to form a cutoff. Good. In this case, since the light shielding member can be disposed closer to the light emitting element, a sharp cut-off line can be formed.

  Furthermore, in the embodiment described above, the support bodies 12, 21, 31, and 41 are each formed in a flat plate shape, a regular hexagonal column shape, or a regular quadrangular column shape. You may provide the radiation fin in the position which does not disturb. Thereby, the heat transmitted from each light emitting element 13 to the column body is dissipated through the radiation fins, so that the heat radiation efficiency of each light emitting element 13 is further enhanced.

  Further, in the above-described embodiment, the case where the present invention is applied to a light emitting device for a vehicle headlamp has been described. However, the present invention is not limited thereto, and the present invention is applied to a light emitting device for other types of vehicle lamps such as a stop lamp. It is clear that the invention can be applied.

  As described above, according to the present invention, a light emitting device for a vehicular lamp that has a simple structure and is compatible with a conventional bulb made of glass bulbs and that can efficiently dissipate heat from the light emitting element. Can be provided.

1 is a schematic side view showing a configuration of a first embodiment of a light emitting device for a vehicle headlamp according to the present invention. It is a front view which shows the principal part of the light-emitting device of the vehicle headlamp shown in FIG. It is a schematic perspective view which shows the light-emitting device of the vehicle headlamp shown in FIG. It is the (A) schematic perspective view and the (B) principal part front view which show the structure of 2nd embodiment of the light-emitting device of the vehicle headlamp by this invention. It is a schematic perspective view which shows the structure of 3rd embodiment of the light-emitting device of the vehicle headlamp by this invention. It is a schematic perspective view which shows the structure of 4th embodiment of the light-emitting device of the vehicle headlamp by this invention. It is a schematic side view which shows the structure of an example of the light-emitting device of the conventional vehicle headlamp.

Explanation of symbols

10, 20, 30, 40 Vehicle headlamp (vehicle lamp)
11 Socket part 11a Terminal 12, 21, 31, 41 Prop body (heat pipe)
13 Light Emitting Element 14 Connector

Claims (6)

A light-emitting device for a vehicle lamp comprising a socket part, a post body extending in the optical axis direction from the socket part, and a plurality of light-emitting elements mounted on a peripheral surface of the optical axis of the post body,
The support body is composed of a heat pipe,
A light-emitting device for a vehicle lamp, wherein each of the light-emitting elements is disposed on the peripheral surface of the support body at substantially the same position as a bulb-standard light-emitting portion.   The light emitting device for a vehicular lamp according to claim 1, wherein the surface of the heat pipe constituting the support body is coated so as to reduce glare light.   The light-emitting device for a vehicular lamp according to claim 1 or 2, wherein the heat pipe constituting the column body extends through the socket to the outside.   The light-emitting device for a vehicle lamp according to any one of claims 1 to 3, wherein a light-shielding member for forming a cut-off is attached to a front end side of the support body.   The heat pipe constituting the support body is formed in a regular polygonal column shape or a flat plate shape, and a light emitting element is mounted on at least one side surface thereof. The light-emitting device of the vehicle lamp as described.   6. The light emitting device according to claim 1, wherein a part of the light emitting elements can be selectively lit and a cut-off can be formed by selective lighting. A light emitting device for a vehicle lamp.

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