JP2021114363A - Lighting fixture for vehicle - Google Patents

Abstract

To improve heat dissipation efficiency of heat generated when a light source is driven and also to prevent fusion, deformation, etc., due to the heat.SOLUTION: A lighting fixture for vehicles comprises a reflector which reflects light emitted from a light source and a bracket which can be tilted by an optical axis adjusting mechanism together with the reflector in one body. An opening for heat radiation is formed over the reflector, a heat radiation plate is provided which covers the opening for heat radiation from above, and the bracket is provided with a heat control plate which is located above the heat radiation plate. Consequently, heat radiated through the opening for heat radiation formed between the upper part of the reflector and the bracket is absorbed by the heat radiation plate, and heat radiated from the heat radiation place is controlled by the heat control plate, so heat radiation efficiency of heat generated when a light source is driven can be improved, and fusion, deformation, etc., due to the heat can be prevented.SELECTED DRAWING: Figure 4

Description

The present invention relates to a technical field of a vehicle lamp having a reflector that reflects light emitted from a light source.

Some vehicle lamps have, for example, a light source that emits light and a reflector that reflects the light emitted from the light source arranged inside a lamp outer housing composed of a cover and a lamp housing (for example, a patent). Reference 1).

In the vehicle lamp described in Patent Document 1, a lamp unit having a light source that emits light, a bracket that supports an optical axis adjusting mechanism, a reflector that reflects light, and the like is arranged inside the outer housing of the lamp, and the lamp unit is arranged from the light source. The emitted light is reflected by the reflector, transmitted through the cover, and is irradiated to the outside.

In such vehicle lamps, heat is generated from the light source or the like when the light source is driven (when lit), and the generated heat rises as high-temperature air to form a space between the bracket and the upper part of the reflector. Flows upward from the lamp unit.

Japanese Unexamined Patent Publication No. 2009-64713

By the way, when the heat generated in the light source or the like and rising as high-temperature air is flowed toward the upper side of the lamp unit, the heat intensively reaches the portion located above the lamp unit, for example, the upper end portion of the lamp housing. This may cause melting or deformation in the part where heat is concentrated.

In particular, when the light source is, for example, a discharge bulb, the amount of heat generated when the light source is driven is large, and the high-temperature air flowing upward tends to cause melting or deformation in the portion where heat is concentrated. turn into. Further, in recent years, vehicle lamps having a small vertical width are often used, and in such vehicle lamps having a small vertical width, the distance between the lamp unit and the upper end portion of the lamp housing is small, and the lamp housing is used. The upper end of the lamp tends to get hot.

Therefore, in the vehicle lighting equipment described in Patent Document 1, a straightening vane is arranged above the space between the bracket and the reflector, and the high temperature is flowed upward from the space between the bracket and the upper part of the reflector. The air is rectified and dispersed by the commutator plate to suppress the concentration of heat on the upper end of the lamp housing.

However, in the above-mentioned vehicle lamps, it is also necessary to efficiently dissipate heat to the outside of the reflector, and heat is properly dispersed after efficiently releasing the heat generated when the light source is driven. It is desirable to suppress the concentration of heat on a part of the lamp to prevent melting and deformation due to heat.

Therefore, the object of the vehicle lamp of the present invention is to improve the heat dissipation efficiency of the heat generated when the light source is driven and to prevent the generation of melting and deformation due to the heat.

First, the vehicle lamp according to the present invention includes a reflector that reflects light emitted from a light source and a bracket that can be tilted integrally with the reflector by an optical axis adjusting mechanism, and is provided on the upper portion of the reflector. Is provided with a heat-dissipating opening, a heat-dissipating plate that covers the heat-dissipating opening from above, and a heat-dissipating plate located above the heat-dissipating plate on the bracket.

As a result, the heat released through the heat radiating opening formed between the upper portion of the reflector and the bracket is absorbed by the heat radiating plate, and the heat released from the heat radiating plate is controlled by the heat control plate.

Secondly, in the vehicle lamp according to the present invention described above, the heat control plate and the heat sink are positioned so as to face each other in the vertical direction, and the outer shape of the heat control plate is made larger than the outer shape of the heat sink. Is desirable.

As a result, the entire heat radiating plate is covered from above by the heat control plate, so that the amount of high-temperature air directed to the heat control plate of the heat released from the heat radiating plate increases.

Thirdly, in the vehicle lamp according to the present invention described above, it is desirable that the heat sink is attached to the bracket.

As a result, the heat sink is attached to the bracket having the heat control plate without the need for a dedicated member for attaching the heat sink.

Fourth, in the vehicle lamp according to the present invention described above, a part of the heat radiating plate is provided as a base surface portion, and the base surface portion has the largest area of each portion of the radiating plate, and the base surface portion and the base surface portion. It is desirable that the heat control plates are in a parallel state.

This makes it easier for high-temperature air, including the heat released from the heat sink, to reach the heat control plate.

Fifth, in the vehicle lamp according to the present invention described above, the bracket is provided with a connecting portion to which the optical axis adjusting mechanism is connected, and the connecting portion and the thermal control plate are integrally formed. desirable.

As a result, the connecting portion to which the optical axis adjusting mechanism is connected and the heat control plate that controls the heat released from the heat radiating plate are integrally formed.

According to the present invention, the heat released through the heat radiating opening formed between the upper part of the reflector and the bracket is absorbed by the heat radiating plate, and the heat released from the heat radiating plate is controlled by the heat control plate. Therefore, it is possible to improve the heat dissipation efficiency of the heat generated when the light source is driven, and it is possible to prevent the generation of melting and deformation due to the heat.

2 to 5 show an embodiment of the vehicle lamp of the present invention, and this figure is a cross-sectional view of the vehicle lamp. It is a perspective view of a shade. It is a perspective view which shows the state which the heat sink was removed from a bracket. It is sectional drawing which shows the heat dissipation path as seen from the side of a vehicle lamp. It is a rear view which shows the heat dissipation path in a cross section with a part seen from the rear of a vehicle lamp.

Hereinafter, a mode for carrying out the vehicle lamp of the present invention will be described with reference to the accompanying drawings.

The vehicle lighting device 1 is, for example, a vehicle headlight, and is attached and arranged at both left and right ends of a front end portion of a vehicle body.

The vehicle lamp 1 includes a lamp housing 2 having an opening at the front end and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 form a lamp outer housing 4, and the internal space of the lamp outer housing 4 is formed as a lamp chamber 5.

An insertion hole 2a penetrated in the front and rear is formed at the rear end of the lamp housing 2.

A lamp unit 6 is arranged in the lamp chamber 5. The lamp unit 6 has a bracket 7, an optical axis adjusting mechanism 8, a fixed shade 9, a movable shade 10, a lens lens holder 11, a projection lens 12, a reflector 13, and a light source 14 (see FIGS. 1 and 2).

The lamp unit 6 is supported by the lamp housing 2 via an optical axis adjusting mechanism 8. Therefore, by operating the optical axis adjusting mechanism 8, the lamp unit 6 is tilted in the vertical direction or the horizontal direction with respect to the lamp housing 2, and the optical axis adjustment (aiming adjustment or leveling adjustment) of the light emitted from the light source 14 is performed. It is made possible to do.

The bracket 7 has a plate-shaped connecting portion 15 facing substantially in the front-rear direction and a heat control plate 16 projecting rearward from the upper end portion of the connecting portion 15 (see FIGS. 1 to 3). The bracket 7 is formed of a material that does not easily absorb heat, for example, a resin material, and specifically, is formed of a thermosetting resin material such as an unsaturated polyester resin, an epoxy resin, or a phenol resin.

The connecting portion 15 is formed in a frame shape. In the connecting portion 15, a first connecting hole 15a is formed on one side portion at the lower end portion, a second connecting hole 15b is formed on the other side portion at the lower end portion, and a second connecting hole 15b is formed on the other side portion at the lower end portion. A third connecting hole 15c is formed. The first connecting hole 15a, the second connecting hole 15b, and the third connecting hole 15c are penetrated back and forth, respectively. The space inside the connecting portion 15 is formed as an insertion hole 15d.

The heat control plate 16 is formed in a plate shape facing in the vertical direction, and is integrally formed with the connecting portion 15. The heat control plate 16 is formed, for example, in a substantially isosceles trapezoidal shape in which the width of the front end in the left-right direction is larger than the width of the rear end in the left-right direction.

The optical axis adjusting mechanism 8 has a first support member 17, a second support member 18, a third support member 19, a pivot shaft 20, a first adjusting screw 21, and a second adjusting screw 22. There is.

The first support member 17 is inserted into the first connecting hole 15a and connected to the bracket 7, the second support member 18 is inserted into the second connecting hole 15b and connected to the bracket 7, and the third support member 18 is connected to the bracket 7. The member 19 is inserted into the third connecting hole 15c and connected to the bracket 7. The second support member 18 is supported by a slide support portion (not shown) provided on the inner surface side of the lower surface portion of the lamp housing 2 so as to be movable in the front-rear direction.

The pivot shaft 20 is provided with a front end portion as a spherical portion 20a, the spherical portion 20a is rotatably supported by a first support member 17 in an arbitrary direction, and a rear end portion is attached to a rear surface portion of the lamp housing 2. .. The front end of the first adjusting screw 21 is provided as a screw portion 21a, the screw portion 21a is screwed into the second support member 18, and the portion near the rear end can rotate to the rear surface portion of the lamp housing 2. Moreover, it is supported in a state where it cannot move in the axial direction. The front end of the second adjusting screw 22 is provided as a screwed portion 22a, the screwed portion 22a is screwed into the third support member 19, and the portion near the rear end can rotate to the rear surface portion of the lamp housing 2. Moreover, it is supported in a state where it cannot move in the axial direction.

In the vehicle lamp 1, for example, an actuator may be provided instead of the second adjusting screw 22. When an actuator is provided, the actuator has a main body portion having a built-in drive mechanism and a screw shaft portion protruding forward from the main body portion, and the screw shaft portion is screwed into the third support member 19. The main body is attached to the rear surface of the lamp housing 2.

When the first adjusting screw 21 is rotated in the optical axis adjusting mechanism 8, the first support member 17 is sent in the front-rear direction to form a line segment connecting the second support member 18 and the third support member 19. The bracket 7 is rotated in the left-right direction as a support shaft, and aiming adjustment is performed in the left-right direction. On the other hand, when the second adjusting screw 22 is rotated in the optical axis adjusting mechanism 8, the second support member 18 is sent in the front-rear direction to connect the first support member 17 and the third support member 19. The bracket 7 is rotated in the vertical direction with the minute as a support axis, and the aiming adjustment in the vertical direction is performed.

When an actuator is provided instead of the second adjusting screw 22, when the screw shaft portion is rotated or moved in the axial direction, the second support member 18 is moved in the front-rear direction and the first The bracket 7 is rotated in the vertical direction around a line segment connecting the support member 17 and the third support member 19, and aiming adjustment or leveling adjustment in the vertical direction is performed.

The fixed shade 9 is formed of a plate-shaped member facing in the front-rear direction, and has a light transmission hole 9a and an arrangement hole 9b that are penetrated in the front-rear direction, respectively. The light transmission hole 9a is formed above the arrangement hole 9b, and is a portion through which the light emitted from the light source 14 is transmitted toward the projection lens 12. The fixed shade 9 is attached to the connecting portion 15 of the bracket 7 from the front side by screwing or the like.

A shielding member 23 is attached to the front surface of the fixed shade 9. The shielding member 23 has a function of preventing unnecessary transmission of light emitted from the light source 14 below the light transmission hole 9a.

The movable shade 10 is rotatably supported by the fixed shade 9 on the rear surface side of the fixed shade 9, and is located between the light transmission hole 9a and the arrangement hole 9b. The movable shade 10 has a function of switching between a so-called high beam light distribution pattern that irradiates a long distance and a so-called low beam light distribution pattern that irradiates a short distance.

A solenoid 24 for rotating the movable shade 10 is attached to the fixed shade 9. The solenoid 24 is attached to the fixed shade 9 in a state of being inserted into the arrangement hole 9b.

The lens holder 11 has a substantially cylindrical holding cylinder portion 11a whose axial direction is in the front-rear direction, and leg portions 11b, 11b, and 11b protruding rearward from the holding cylinder portion 11a, respectively (FIGS. 1 and 1 and FIG. 2). The legs 11b, 11b, 11b are positioned apart from each other in the circumferential direction, and the rear end portion is attached to the fixed shade 9 from the front side by screwing or the like.

The projection lens 12 has a function of reversing an image on the focal plane including the rear focal point formed when light is emitted from the light source 14 and projecting it forward. The projection lens 12 is held by the holding cylinder portion 11a of the lens holder 11.

The reflector 13 has a reflecting portion 25 that reflects light and a socket mounting portion 26 that is continuous with the rear end of the reflecting portion 25 (see FIGS. 1 to 3). The inner surface of the reflecting portion 25 is formed as a reflecting surface 25a, and the reflecting surface 25a is formed as a substantially elliptical spherical surface. The reflecting surface 25a is formed so that the first focus coincides with the light emitting portion described later of the light source 14 and the second focus coincides with the rear focal point of the projection lens 12. At the upper end of the reflection portion 25, a heat dissipation opening 25b that is opened forward and penetrates vertically is formed.

The front end of the reflector 13 is attached to the fixed shade 9 from the rear side by screwing or the like. The reflector 13 is attached to the fixed shade 9 and its front end is inserted into the insertion hole 15d of the bracket 7. Further, in the state where the reflector 13 is attached to the fixed shade 9, a space is formed between the upper end of the insertion hole 15d and the upper part of the reflector 13 on the upper side of the heat dissipation opening 25b, and this space is the heat dissipation space 27. Is formed as.

The light source 14 is, for example, a discharge bulb, and has a light emitting unit 28 that emits light and a socket unit 29 that holds the light emitting unit 28. The light source 14 has a socket portion 29 attached to the socket attachment portion 26 of the reflector 13.

When a driving voltage is applied to the light source 14 by driving a lighting circuit (not shown), light is emitted from the light emitting unit 28. The light emitted from the light emitting unit 28 is directed forward or reflected by the reflecting surface 25a of the reflector 13, focused on the focal plane including the rear focal point of the projection lens 12, and is forwardly illuminated by the projection lens 12. Be projected.

A heat sink 30 is attached to the bracket 7. The heat radiating plate 30 is formed by being bent into a predetermined shape by a metal material having high heat dissipation, and is bent downward with respect to the base surface portion 31 facing in the vertical direction and the base surface portion 31, and the surrounding surface portions 32, 32, 32 and the base surface portion. It has an attached surface portion 33 that is bent upward with respect to 31 and an addressing surface portion 34 that is bent rearward with respect to the attached surface portion 33.

Similar to the thermal control plate 16 of the bracket 7, the base surface portion 31 is formed in a substantially isosceles trapezoidal shape in which, for example, the width of the front end in the left-right direction is larger than the width of the rear end in the left-right direction. The outer shape of the base surface portion 31 is one size smaller than the outer shape of the heat control plate 16.

The surrounding surface portions 32, 32, 32 are bent in a direction orthogonal to the trailing edge and both side edges (oblique edges on both sides) of the base surface portion 31. The base surface portion 31 is reinforced by the surrounding surface portions 32, 32, 32, and the strength of the base surface portion 31 is increased. The attached surface portion 33 is formed in a horizontally long shape facing in the front-rear direction, and is attached from the front to the front surface of the upper end portion of the connecting portion 15 by screwing or the like. The addressing surface portion 34 is pressed against a part of the upper surface of the bracket 7 in a state where the attached surface portion 33 is attached to the connecting portion 15.

The heat radiating plate 30 may be attached with the surface to be attached 33 attached by the same screw member as the fixed shade 9 in a so-called co-tightened state.

The area of the base surface portion 31 of the heat radiating plate 30 is larger than the area of the surrounding surface portions 32, 32, 32, the mounted surface portion 33, and the addressing surface portion 34. Therefore, the base surface portion 31 is a portion of the heat radiating plate 30 having the maximum area.

In the state where the heat radiating plate 30 is attached to the bracket 7, the base surface portion 31 and the surrounding surface portions 32, 32, 32 are located directly below the thermal control plate 16, and the thermal control plate 16 and the base surface portion 31 are separated from each other in the vertical direction and parallel to each other. It is positioned facing each other in a state of being. The outer shape of the base surface portion 31 is one size smaller than the outer shape of the thermal control plate 16, and the entire base surface portion 31 is covered from above by the thermal control plate 16. Further, the heat radiating opening 25b formed in the upper part of the bracket 7 is covered from above by the base surface portion 31.

An extension 35 is arranged inside the light room 5. The extension 35 is arranged at a position surrounding the projection lens 12 from the surroundings.

A back cover 36 is attached to the rear end portion of the lamp housing 2 and the socket mounting portion 26 of the reflector 13, and the insertion hole 2a of the lamp housing 2 is closed by the back cover 36. The back cover 36 is made of a rubber material and is elastically deformed following the displacement of the reflector 13 that is tilted with respect to the lamp housing 2 when the optical axis of the lamp unit 6 is adjusted.

In the vehicle lamp 1 configured as described above, when the light source 14 is driven (when lit), heat is generated in the light source 14 and the like, and the generated heat rises as high-temperature air and the lamp is emitted from the heat dissipation opening 25b. It is flowed upward of the unit 6.

The high-temperature air flowing upward from the heat radiating opening 25b passes through the heat radiating space 27 and reaches the base surface portion 31 or the surrounding surface portions 32, 32, 32. Therefore, the heat generated in the light source 14 and the like is absorbed by the base surface portion 31 or the surrounding surface portions 32, 32, 32.

The heat absorbed by the base surface portion 31 or the surrounding surface portions 32, 32, 32 is mainly released upward from the base surface portion 31 (see the arrow in FIG. 4). At this time, since the heat control plate 16 formed of a material that does not easily absorb heat is located directly above the base surface portion 31, high-temperature air including heat released upward from the base surface portion 31 is released from the heat control plate 16. It is flowed and dispersed toward the outer periphery of the heat control plate 16 along the lower surface of the heat control plate 16 and is flowed upward from the outer periphery side of the heat control plate 16 (see the arrows in FIGS. 4 and 5). Therefore, the heat generated by the light source 14 or the like and rising as high-temperature air does not reach the portion located above the lamp unit 6, for example, the upper end portion of the lamp housing 2, and reaches the upper end portion of the lamp housing 2. Hard to melt or deform.

As described above, the vehicle lamp 1 is provided with a heat radiating plate 30 that covers the heat radiating opening 25b formed in the upper part of the reflector 13 from above, and the bracket 7 is located above the heat radiating plate 30. A heat control plate 16 for controlling the heat released from the heat radiating plate 30 is provided.

Therefore, the heat released through the heat radiating opening 25b is absorbed by the heat radiating plate 30, and the heat released from the heat radiating plate 30 is controlled by the heat control plate 16, so that the heat generated when the light source 14 is driven It is possible to improve the heat dissipation efficiency and prevent the occurrence of melting and deformation due to heat.

Further, the heat control plate 16 and the heat radiating plate 30 are positioned so as to face each other in the vertical direction, and the outer shape of the heat control plate 16 is larger than the outer shape of the heat radiating plate 30.

Therefore, since the entire heat radiating plate 30 is covered from above by the heat control plate 16, the amount of high-temperature air directed to the heat control plate 16 of the heat released from the heat radiating plate 30 increases, and the functionality of the heat control plate 16 increases. It is possible to disperse a large amount of heat emitted from the heat radiating plate 30 in an appropriate direction.

Further, a heat sink 30 is attached to the bracket 7.

Therefore, since the heat sink 30 is attached to the bracket 7 having the heat control plate 16 without the need for a dedicated member for attaching the heat sink 30, it is possible to reduce the number of parts in the vehicle lamp 1 and to dissipate heat. The positional accuracy of the heat control plate 16 with respect to the plate 30 is improved, and the distribution control of the heat released from the heat radiating plate 30 can be appropriately performed.

Furthermore, a part of the heat radiating plate 30 is provided as a base surface portion 31, the area of the base surface portion 31 is the largest among each portion of the radiating plate 30, and the base surface portion 31 and the heat control plate 16 are in a parallel state. ..

Therefore, the high-temperature air including the heat released from the heat radiating plate 30 can easily reach the heat control plate 16, and the control efficiency can be improved with respect to the dispersion of the heat released from the heat radiating plate 30.

In addition, the heat radiating plate 30 is provided with a connecting portion 15 to which the optical axis adjusting mechanism 8 is connected, and the connecting portion 15 and the heat control plate 16 are integrally formed.

Therefore, since the connecting portion 15 to which the optical axis adjusting mechanism 8 is connected and the heat control plate 16 for controlling the heat released from the heat radiating plate 30 are integrally formed, high strength of the heat control plate 16 can be ensured. At the same time, the number of parts in the vehicle lamp 1 can be reduced.

1 ... Vehicle lamp, 7 ... Bracket, 8 ... Optical axis adjustment mechanism, 13 ... Reflector, 14 ... Light source, 15 ... Connecting part, 16 ... Heat control plate, 25b ... Heat dissipation opening, 30 ... Heat sink, 31 ... Base Face

Claims (5)

A reflector that reflects the light emitted from the light source,
It is equipped with a bracket that can be tilted integrally with the reflector by an optical axis adjustment mechanism.
A heat dissipation opening is formed in the upper part of the reflector.
A heat sink is provided to cover the heat dissipation opening from above.
A vehicle lamp provided with a heat control plate located above the heat sink on the bracket. The heat control plate and the heat sink are positioned so as to face each other in the vertical direction.
The vehicle lamp according to claim 1, wherein the outer shape of the heat control plate is larger than the outer shape of the heat sink. The vehicle lamp according to claim 1 or 2, wherein the heat sink is attached to the bracket. A part of the heat sink is provided as a base surface portion.
The base surface portion has the largest area of each portion of the heat sink.
The vehicle lamp according to claim 1, 2, or 3, wherein the base surface portion and the thermal control plate are in a parallel state. The bracket is provided with a connecting portion to which the optical axis adjusting mechanism is connected.
The vehicle lamp according to claim 1, claim 2, claim 3 or claim 4, wherein the connecting portion and the thermal control plate are integrally formed.

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