JP7433326B2 - Vehicle lights and light units - Google Patents

Description

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

Vehicle lamps have a rotating reflector that reflects the light emitted from the light source and a heat sink that emits heat generated when the light source is driven, inside the lamp outer casing that is composed of a lamp housing and a cover. There are some devices in which cooling air generated by a cooling fan is blown toward the device (for example, see Patent Document 1).

In such a vehicle lamp, light emitted from a light source is reflected by a rotating reflector, and the light is scanned by the rotating reflector and irradiated to the outside to form a predetermined light distribution pattern. When the light source is driven (lit), heat is generated in the light source and the circuit board on which the light source is mounted, but the generated heat is transferred to the heat sink and released, and is also generated by the cooling fan towards the heat sink. Cooling air is blown. Therefore, the temperature rise of the light source and the circuit board is suppressed, and a stable driving state of the light source and the circuit board is ensured.

Re-table No. 2015-122303

By the way, in a vehicle lamp equipped with a cooling fan and a heat sink as described above, the cooling efficiency for the light source etc. is high and stable driving conditions of the light source and circuit board are ensured, but the cooling air generated by the cooling fan If the cooling air flows toward the rotating reflector, there is a possibility that the cooling air will affect the rotation of the rotating reflector and cause a problem in the rotational operation of the rotating reflector.

Therefore, an object of the vehicular lamp of the present invention is to ensure a stable driving state of the light source and also to ensure good rotational operation of the rotary reflector.

First, the vehicular lamp according to the present invention includes a lamp housing having an opening and a cover attached to the lamp housing with the opening closed, and an inner space is formed as an arrangement space. and a cooling fan attached to the lamp housing, and a lamp unit arranged in the arrangement space, and the lamp unit includes a rotary reflector that reflects light emitted from a light source and a motor that rotates the rotary reflector. a heat sink that emits heat generated when the light source is driven, the rotary reflector is located apart from a projection surface in the axial direction of the cooling fan, and at least a portion of the heat sink overlaps the projection surface. It exists in

This makes it difficult for the cooling air generated by the cooling fan to flow toward the rotating reflector, and makes it easier for the cooling air to flow toward the heat sink.

Second, in the above-described vehicle lamp according to the present invention, it is desirable that the axial direction of the cooling fan and the axial direction of the rotary reflector be the same.

As a result, the central axis of the cooling fan and the central axis of the rotating reflector do not intersect.

Thirdly, in the above-described vehicle lamp according to the present invention, the direction of flow of the cooling air generated by the cooling fan and the direction of flow of the air generated as the rotary reflector rotates are opposite to each other. is desirable.

This makes it difficult for the rotating reflector to suck in the cooling air generated by the cooling fan when the rotating reflector rotates.

Fourthly, in the above-described vehicle lamp according to the present invention, the lamp unit is provided with a circuit board on which a light source is mounted, and the heat sink has a base portion on which the circuit board is arranged and a base portion protruding from the base portion. a plurality of heat dissipation fins arranged side by side; each of the heat dissipation fins is formed as a maximum heat dissipation surface with the largest area on both sides in the thickness direction; and the maximum heat dissipation surface is parallel to the axial direction of the cooling fan. It is desirable that

Thereby, the cooling air generated by the cooling fan flows in a direction parallel to the maximum heat dissipation surface.

Fifth, in the above-described vehicle lamp according to the present invention, it is preferable that the heat sink is provided with a flow regulating portion that regulates the flow of cooling air generated by the cooling fan toward the rotary reflector.

Thereby, there is no need to provide a dedicated member to restrict the flow of cooling air toward the rotating reflector.

Sixthly, another lamp unit according to the present invention has an outer periphery configured by an entrance surface into which the light emitted from the light source is incident, an exit surface through which the light incident from the entrance surface is output, and a plurality of surface parts. a projection lens having a surface, a lens holder that holds the projection lens, and a protector attached to the lens holder, at least one of the plurality of surface portions is formed as a covered surface portion, and the protector has the covered surface portion. A light-shielding piece is provided to cover at least a portion of the area.

As a result, at least a portion of the covered surface portion of the projection lens is covered by the light shielding piece provided on the protector.

Seventhly, in the above-described another lamp unit according to the present invention, it is desirable that a gap be formed between the covering surface portion and the light shielding piece.

Thereby, the light shielding piece does not come into contact with the covered surface portion.

Eighthly, in the above-described another lamp unit according to the present invention, it is desirable that grains or steps be formed on the covering surface portion.

As a result, external light that is incident on the projection lens and reaches the covered surface portion is diffused by the grains or steps.

Ninthly, in the above-described another lamp unit according to the present invention, it is preferable that the size of the light shielding piece is smaller than or equal to the size of the covering surface portion.

This makes it possible to position the light shielding piece without protruding outside the projection lens.

Tenthly, in the above-described another lamp unit according to the present invention, it is desirable that the lower surface portion of the projection lens is formed as the covering surface portion.

Thereby, the surface portion that sunlight easily reaches is covered by the light shielding piece.

According to the present invention, it is difficult for the cooling air generated by the cooling fan to flow toward the rotating reflector, and the cooling air is more likely to flow toward the heat sink. The generated cooling air is less likely to affect the rotation of the rotary reflector, and it is possible to ensure a stable driving state of the light source and to ensure good rotational operation of the rotary reflector.

An embodiment of the present invention is shown together with FIGS. 2 to 10, and this figure is a sectional view of a vehicular lamp. FIG. 3 is a plan view of the lamp unit. FIG. 3 is a side view of one side of the lamp unit. FIG. 3 is a rear view of the lamp unit. FIG. 3 is a side view of the other side of the lamp unit. FIG. 3 is a cross-sectional view of the lamp unit. FIG. 2 is an exploded perspective view of a projection lens, a protector, and a lens holder. It is a perspective view of a projection lens, a protector, and a lens holder. FIG. 3 is a cross-sectional view showing the positional relationship between the cooling fan and the lamp unit. FIG. 3 is a cross-sectional view showing a state in which sunlight is incident on the projection lens.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to an accompanying drawing.

The vehicular lamp 1 is, for example, a vehicular headlamp, and is disposed at both left and right ends of the front end of the vehicle body.

The vehicular lamp 1 includes a lamp housing 2 having an opening at the front end and a cover 3 attached to the lamp housing 2 in a state where the opening of the lamp housing 2 is closed (see FIG. 1). The lamp housing 2 and the cover 3 constitute a lamp outer casing 4. The interior space of the lamp outer casing 4 is formed as an arrangement space 4a.

A cooling fan 5 is attached to the lamp housing 2. The cooling fan 5 has a function of drawing outside air into the arrangement space 4a and cooling each part arranged in the arrangement space 4a.

A lamp unit 6 is arranged in the arrangement space 4a. The lamp unit 6 includes a lens holder 7, a heat sink 8, a projection lens 9, a protector 10, and a reflector block 11 (see FIGS. 2 to 6).

The lens holder 7 includes, for example, a frame-shaped lens holding part 12 in which each part is integrally formed of a resin material and whose axis direction is the front-back direction, and a substantially U-shaped lens holding part 12 that projects rearward from the lens holding part 12 and opens forward. (See FIG. 7).

The lens holding part 12 has an upper part 14 and a lower part 15 extending in the left-right direction, and side parts 16, 16 that are spaced apart from each other in the left-right direction. It is formed in a substantially arc shape. The lens holding portion 12 is provided with positioning pins 12a, 12a, 12a that project forward and are spaced apart in the circumferential direction.

The upper part 14 is provided with upwardly protruding regulating walls 14a, 14a spaced apart from each other in the left and right directions. An upwardly projecting mounting protrusion 14b is provided on the upper portion 14 between the regulating walls 14a, 14a.

A regulating wall 15a projecting downward is provided in the lower part 15 at approximately the center in the left-right direction. Attachment protrusions 15b, 15b protruding downward are provided in the lower part 15 on the left and right sides of the regulating wall 15a. Positioning protrusions 15c, 15c projecting downward are provided on the lower part 15 on the outside of the mounting protrusions 15b, 15b in the left-right direction.

The attachment part 13 protrudes rearward from a position near one end in the left-right direction of the lens holding part 12, and has attachment holes 13a, 13a. The mounting holes 13a, 13a pass through from side to side and are spaced apart from each other up and down.

The heat sink 8 has an optical axis adjustment base 17 and a substrate mounting base 18, and each part is integrally formed of a metal material with high heat dissipation (see FIGS. 2 to 5).

The optical axis adjustment base 17 includes a continuous portion 19 that extends vertically, an upper connecting portion 20 that projects laterally from the upper end of the continuous portion 19, and a lower connecting portion 21 that projects laterally from the lower end of the continuous portion 19. and a flow regulating part 22 protruding downward from the tip of the upper connecting part 20, and the upper connecting part 20 and the lower connecting part 21 project in the same direction from the continuous part 19.

An upper connecting hole 20a is formed in the end of the upper connecting part 20 on the side of the continuous part 19, and is penetrated from front to back. A vertical aiming screw (not shown) is inserted into and connected to the upper connecting hole 20a, and the rear end of the vertical aiming screw is rotatably supported by the lamp housing 2.

A lower connecting hole 21a is formed at the distal end of the lower connecting portion 21, and is passed through the lower connecting hole 21a from front to back. A left and right aiming screw (not shown) is inserted into and connected to the lower connection hole 21a, and the rear end of the left and right aiming screw is rotatably supported by the lamp housing 2. A pivot connection hole 21b is formed at the end of the lower connection part 21 on the continuous part 19 side. A pivot shaft (not shown) is connected to the pivot connection hole 21b, and the rear end of the pivot shaft is supported by the lamp housing 2.

When the vertical aiming screw is rotated in the direction around the axis, the entire lamp unit 6 including the heat sink 8 is tilted in the vertical direction using the pivot shaft as a fulcrum, vertical aiming is performed, and the left and right aiming screws are rotated in the direction around the axis. Then, the entire lamp unit 6 including the heat sink 8 is tilted in the left-right direction about the pivot shaft, and left-right aiming is performed.

The substrate mounting base 18 has a plate-shaped base portion 23 facing in the left-right direction, and radiation fins 24, 24, . . . that project laterally from the base portion 23 and are arranged vertically. In the substrate mounting base 18 , the rear end of the base portion 23 is continuous to the continuous portion 19 .

A circuit board 25 is attached to the surface of the base portion 23 opposite to the side where the radiation fins 24, 24, . . . are located. Light sources 26, 26, . . . are mounted on the circuit board 25 in a row above and below. As the light source 26, for example, a light emitting diode (LED) is used. The light sources 26, 26, . . . are individually controlled to turn on and off.

The radiation fins 24, 24, . . . protrude from the base portion 23 in a direction opposite to the direction in which the upper connecting portion 20 protrudes from the continuous portion 19, and their thickness directions are aligned with the vertical direction. The heat radiation fins 24 are formed with maximum heat radiation surfaces 24a, 24a having the largest area on both upper and lower surfaces.

The heat sink 8 is attached to the attachment part 13 of the lens holder 7. Specifically, both upper and lower ends of the front end of the base portion 23 are attached by attachment screws 100, 100 inserted into attachment holes 13a, 13a, respectively.

The projection lens 9 includes a main body 27 that controls light emitted from the light sources 26, 26, . are integrally formed of, for example, a transparent resin material (see FIGS. 2 to 7).

The outer surface of the main body section 27 includes an entrance surface 29 into which light emitted from the light sources 26, 26, . It is made up of.

The entrance surface 29 is formed as a surface facing substantially rearward. The output surface 30 is a surface located on the front side, and is formed in a substantially arcuate shape that is convex toward the front.

The outer circumferential surface 31 includes an upper surface portion 31a, a side surface portion 31b, and a lower surface portion 31c that are continuous in this order in the circumferential direction. The side surface portion 31b is formed as a surface facing inward in the left-right direction of the vehicle. The upper surface portion 31a and the lower surface portion 31c are, for example, textured, and the side surface portion 31b is formed with, for example, textures and steps. However, in addition to the grain, steps may also be formed on the upper surface portion 31a and the lower surface portion 31c.

The projecting portion 28 projects outward from the rear end of the outer circumferential surface 31 and is formed in a substantially U-shape that opens laterally. Hole-like or notch-like positioning parts 28a, 28a, 28a are formed in the overhanging part 28 so as to be spaced apart in the circumferential direction.

The projection lens 9 is attached to the lens holder 12 and held by the lens holder 7. The projection lens 9 is attached to the lens holder 12 by inserting the positioning pins 12a, 12a, 12a into the positioning parts 28a, 28a, 28a, respectively, and positioning the projection lens 9 with respect to the lens holder 7. This is done by, for example, adhering or welding the rear surface of the projecting portion 28 to the front surface of the lens holding portion 12.

The protector 10 includes a frame portion 32 that is penetrated in the front and back and predetermined portions that protrude rearward or forward from the frame portion 32, which are integrally formed of, for example, a metal material (see FIG. 7). The entire protector 10 is, for example, black.

The frame portion 32 is formed into a plate shape facing in the front-rear direction, and is formed in a size and shape corresponding to the lens holding portion 12 of the lens holder 7. The frame-shaped portion 32 has an upper portion 33 and a lower portion 34 extending in the left-right direction, and side portions 35, 35 located apart from each other in the left-right direction.The side portions 35, 35 extend outward in the left-right direction. It is formed into a roughly arcuate shape with a gentle convexity.

Upper positioning pieces 36, 36 and an upper attached piece 37 protrude rearward from the upper edge of the upper part 33, respectively. The upper positioning pieces 36, 36 are located apart from each other in the left and right directions, and the upper attached piece 37 is located between the upper positioning pieces 36, 36. A mounting hole 37a is formed in the upper mounting piece 37 and is vertically penetrated therethrough. The upper positioning pieces 36, 36 and the upper attached piece 37 are elastically deformable in the direction of vertical displacement with respect to the frame portion 32.

A lower positioning piece 38 and lower attached pieces 39, 39 protrude rearward from the lower edge of the lower part 34, respectively. The lower positioning piece 38 projects rearward from approximately the center in the left-right direction of the lower part 34, and the lower attached pieces 39 are located on the left and right sides of the lower positioning piece 38. Attachment holes 39a, 39a are formed in the lower attachment pieces 39, 39, which are vertically penetrated therethrough. The lower positioning piece 38 and the lower attached pieces 39, 39 are elastically deformable in the direction of vertical displacement with respect to the frame portion 32.

A light shielding piece 40 projects forward from the upper edge of the lower part 34. The light shielding piece 40 is formed in substantially the same shape as the lower surface part 31c of the projection lens 9, and has the same size as the lower surface part 31c or one size smaller than the lower surface part 31c. However, the light shielding piece 40 may be formed to have the same shape and size as the lower surface portion 31c.

Projecting pieces 41, 41 and a pressing piece 42 protrude rearward from the outer edge of one side portion 35, respectively. The protruding pieces 41, 41 are vertically spaced apart from each other, and the pressing piece 42 is located between the protruding pieces 41, 41. The holding piece 42 can be elastically deformed in a direction in which it is displaced from side to side with respect to the frame-shaped portion 32.

The protector 10 is attached to the lens holder 12 with the projection lens 9 attached to the lens holder 12 of the lens holder 7 (see FIG. 8). The protector 10 is constructed by inserting the mounting protrusion 14b into the mounting hole 37a of the upper mounting piece 37 and inserting the mounting projections 15b into the mounting holes 39a, 39a of the lower mounting pieces 39, 39, respectively. It is attached to the lens holding part 12.

At this time, the tips of the upper positioning pieces 36, 36 are abutted against the front surfaces of the regulating walls 14a, 14a, respectively, and the tips of the lower positioning pieces 38 are abutted against the front surface of the regulating wall 15a, so that the protector 10 is moved forward and backward relative to the lens holder 7. Positioning in the direction is performed. Also, parts of the lower attachment pieces 39, 39 are engaged with the positioning protrusions 15c, 15c, respectively, and the pressing pieces 42 are pressed against the side parts 16 from the side, so that the protector 10 is moved in the left-right direction with respect to the lens holder 7. Positioning is performed at .

When the protector 10 is attached to the lens holding part 12, the projecting part 28 of the projection lens 9 is shielded from the front side by the frame-shaped part 32, and the lower surface part 31c of the projection lens 9 is shielded from below by the light shielding piece 40. (See FIGS. 2, 3 and 5). Therefore, the lower surface portion 31c of the projection lens 9 is a covered surface portion that is covered from below by the light shielding piece 40.

As described above, in a state where the protector 10 is attached to the lens holding part 12, the overhanging part 28 of the projection lens 9 is shielded by the frame-shaped part 32, and the overhanging part 28 and the lens holding part 12 are connected by the protector 10. part is occluded. Therefore, the protector 10 has a shielding function of shielding a part of the structure arranged in the arrangement space 4a, and the protector 10 improves the appearance of the vehicle lamp 1 when viewed from the front.

In a state where the protector 10 is attached to the lens holding portion 12, the light shielding piece 40 is positioned below the lower surface portion 31c with a slight gap between the light shielding piece 40 and the lower surface portion 31c.

The reflector block 11 has a case 43, a motor 44, a rotating reflector 45, and a shade 46 (see FIGS. 2 to 6).

The case 43 has a substantially annular base surface portion 47 and a peripheral surface portion 48 protruding from the outer peripheral portion of the base surface portion 47, and a center hole of the base surface portion 47 is formed as a shaft insertion hole 47a. The circumferential surface portion 48 is provided with coupling protrusions 48a, 48a, . . . that protrude outward and are spaced apart in the circumferential direction. The case 43 is arranged with the base surface portion 47 facing diagonally to the side. A motor board 49 is attached to the back surface of the base surface portion 47.

The motor 44 has a motor body 44a and a motor shaft 44b. The motor body 44a is attached to the motor board 49 from the back side, and a part of the motor shaft 44b is inserted into the motor board 49 and the shaft insertion hole 47a of the base surface portion 47. It is inserted and located inside the case 43.

The rotating reflector 45 is fixed to the motor shaft 44b and rotated inside the case 43. The rotational reflector 45 has a rotational fulcrum portion 50 that functions as a rotational fulcrum and a reflecting portion 51 located on the outer peripheral side of the rotational fulcrum portion 50, and the rotational fulcrum portion 50 is fixed to the motor shaft 44b. The surface of the reflecting portion 51 opposite to the base surface portion 47 is formed as a reflection control surface 51a, and is slightly inclined with respect to the rotation axis direction of the rotary reflector 45.

The shade 46 is formed by bending a flat metal material into a predetermined shape, and includes a shielding plate portion 52 that covers a portion of the rotary reflector 45 except for a part, and a shielding plate portion 52 that is perpendicular to the shielding plate portion 52 from the outer periphery of the shielding plate portion 52. It has coupling piece parts 53, 53, . . . that protrude in the same direction. A light passage hole 52a is formed in the shielding plate portion 52. The coupling pieces 53, 53, . . . are elastically deformable relative to the shielding plate portion 52 in the thickness direction, and coupling holes 53a, 53a, . . . are formed in the coupling pieces 53, 53, . has been done.

The shade 46 is attached to the case 43 by inserting the coupling protrusions 48a, 48a, . . . into the coupling holes 53a, 53a, . . . , respectively. When the shade 46 is attached to the case 43, the light passing hole 52a is located on the side of the light sources 26, 26, . be exposed.

The reflector block 11 is attached to the upper connecting portion 20 and lower connecting portion 21 of the heat sink 8 via attachment plates 54, 54 (see FIGS. 2 to 4). Parts of the mounting metal plates 54, 54 are each coupled to the case 43, and other parts are coupled to the upper coupling part 20 and the lower coupling part 21, respectively, and are coupled to the upper coupling part 20 and the lower coupling part 21, respectively. Each part is attached by screw members 200, 200. Accordingly, the reflector block 11 is attached to the upper connecting portion 20 and the lower connecting portion 21 with the screw members 200, 200 via the metal plates 54, 54 for attachment.

In the lamp unit 6 configured as described above, the light emitted from the light sources 26, 26, . , and is scanned by the reflection control surface 51a. The light reflected by the reflection part 51 passes through the light passage hole 52a again, enters the projection lens 9 from the entrance surface 29, is controlled by the projection lens 9 to become substantially parallel light, and is transmitted through the cover 3 and directed forward. It is irradiated towards. At this time, a portion of the light emitted from the light sources 26, 26, . A light distribution pattern is formed.

When light is emitted from the light sources 26, 26, . . . , heat is generated in the light sources 26, 26, . 24, . . ., the temperature rise of the light sources 26, 26, . . . and the circuit board 25 is suppressed, and a good driving state of both is ensured. At this time, the most heat is radiated from the maximum heat radiation surfaces 24a, 24a, . . . of the radiation fins 24, 24, .

In the vehicle lamp 1, as described above, the light sources 26, 26, . At times, it is possible to control a predetermined light source 26 to be turned off so that light directed toward an oncoming vehicle, a preceding vehicle, or a pedestrian is not irradiated.

An extension 55 is arranged in the arrangement space 4a of the lamp outer casing 4 (see FIGS. 9 and 10). The extension 55 is arranged so as to shield a portion of the lamp unit 6 other than the emission surface 30 from the surroundings.

In the vehicle lamp 1 configured as described above, the rotary reflector 45 is located apart from the projection surface A in the axial direction P of the cooling fan 5, and at least a portion of the heat sink 8 is located at a position overlapping the projection surface A. (See FIG. 9). For example, the heat sink 8 exists at a position where at least the radiation fins 24, 24, . . . overlap the projection plane A. Further, in the vehicle lamp 1, the axial direction P of the cooling fan 5 and the axial direction Q of the rotary reflector 45 are the same direction or substantially the same direction.

When the light sources 26, 26, . The cooled air is sent toward the lamp unit 6 as cooling air. At this time, as described above, since the rotary reflector 45 is located apart from the projection plane A in the axial direction P of the cooling fan 5, the cooling air is difficult to flow toward the rotary reflector 45 and to the heat sink 8. It is easy to drift towards the target. Furthermore, since the axial direction P of the cooling fan 5 and the axial direction Q of the rotary reflector 45 are in the same direction or substantially the same direction, the cooling air generated by the cooling fan 5 flows toward the rotary reflector 45. hard.

Further, a flow regulating section 22 provided as a part of the heat sink 8 is located between the cooling fan 5 and the rotating reflector 45. Therefore, the flow of the cooling air generated by the cooling fan 5 toward the rotating reflector 45 is regulated by the flow regulating portion 22, so that the cooling air generated by the cooling fan 5 is made more difficult to flow toward the rotating reflector 45. ing.

As mentioned above, when light is emitted from the light sources 26, 26, . . . , the cooling fan 5 is rotated for cooling, and the rotating reflector 45 is rotated to reflect and scan the light. At this time, a flow of wind occurs near the rotary reflector 45 as the rotary reflector 45 rotates, but the wind generated along with the rotation of the rotary reflector 45 flows toward the back side of the rotary reflector 45 in the axial direction Q. has been done.

Therefore, the flow direction of the cooling air generated by the cooling fan 5 and the flow direction of the air generated as the rotating reflector 45 rotates are opposite to each other, and the cooling air generated by the cooling fan 5 flows in the opposite direction when the rotating reflector 45 rotates. The rotating reflector 45 makes it difficult to be sucked in.

On the other hand, in the vehicle lamp 1, the maximum heat radiation surfaces 24a, 24a, ..., which are the upper and lower surfaces of the heat radiation fins 24, 24, ... are parallel or substantially parallel to the axial direction P of the cooling fan 5, Cooling air generated by the cooling fan 5 flows in a direction parallel to the maximum heat radiation surfaces 24a, 24a, .

As described above, in the vehicle lamp 1, the rotary reflector 45 is located apart from the projection plane A in the axial direction P of the cooling fan 5, and the heat sink 8 is located at a position where at least a part of it overlaps the projection plane A. exists in

Therefore, the cooling air generated by the cooling fan 5 is less likely to flow toward the rotary reflector 45, and the cooling air is more likely to flow toward the heat sink 8. This increases the efficiency of heat release from the heat sink 8, and makes it difficult for the cooling air generated by the cooling fan 5 to affect the rotation of the rotary reflector 45, ensuring a stable driving state of the light sources 26, 26, . . . Once this is ensured, a good rotational operation of the rotating reflector 45 can be ensured.

Further, since the axial direction P of the cooling fan 5 and the axial direction Q of the rotating reflector 45 are in the same direction, the central axis of the cooling fan 5 and the central axis of the rotating reflector 45 do not intersect.

Therefore, the cooling air generated by the cooling fan 5 is difficult to flow toward the rotating reflector 45, ensuring a stable rotating state of the rotating reflector 45, and ensuring proper light distribution by the light emitted from the light sources 26, 26, . state can be secured.

Furthermore, the flow direction of the cooling air generated by the cooling fan 5 and the flow direction of the air generated as the rotary reflector 45 rotates are opposite to each other.

Therefore, the cooling air generated by the cooling fan 5 is less likely to be sucked in by the rotating reflector 45 when the rotating reflector 45 rotates, the cooling air is less likely to affect the rotation of the rotating reflector 45, and a more stable rotational state of the rotating reflector 45 is achieved. can be secured.

Furthermore, the heat radiation fins 24, 24, ... are formed as maximum heat radiation surfaces 24a, 24a, ... with the largest area on both sides in the thickness direction, and the maximum heat radiation surfaces 24a, 24a, ... are cooled. It is parallel to the axial direction of the fan 5.

Therefore, the cooling air generated by the cooling fan 5 flows in a direction parallel to the maximum heat radiation surfaces 24a, 24a, . . . , so that the heat radiation performance of the heat sink 8 can be improved.

In addition, the heat sink 8 is provided with a flow regulating section 22 that regulates the flow of cooling air generated by the cooling fan 5 toward the rotating reflector 45 .

Therefore, since the flow of the cooling air toward the rotary reflector 45 is regulated by a part of the heat sink 8, there is no need to provide a special member to restrict the flow of the cooling air toward the rotary reflector 45. In addition to reducing the number of points, it is possible to suppress the influence of the cooling air on the rotation of the rotary reflector 45.

Incidentally, in a vehicle lamp, a lamp unit having a projection lens for controlling light emitted from a light source and a lens holder for holding the projection lens is disposed inside a lamp outer casing constituted by a lamp housing and a cover. There is a type in which the light emitted from the light source is controlled by a projection lens so that it becomes parallel light, and is transmitted through a cover and irradiated forward.

Such a vehicle lamp is provided with a flange-like protrusion that protrudes outward at the rear end of the projection lens, and the protrusion is attached to a lens holder so that the projection lens is held by the lens holder. In some cases, the projecting portion is closed by a predetermined member (for example, see Japanese Patent Application Laid-Open No. 2017-22032).

In the vehicle lamp described in the above-mentioned document, a first member and a second member are provided as a lens holder, the first member is attached to the overhang, and the second member is attached to the overhang. The first member is configured to be attached to the first member while covering the first member. Therefore, the second member functions as a protector that covers the overhang that is a part of the projection lens, and by covering the overhang with the protector, a good appearance is ensured when the vehicle lamp is viewed from the front. This will improve visibility.

In a vehicle lamp equipped with a lamp unit having a projection lens as described above, there is a possibility that sunlight transmitted through the cover may be incident on the projection lens. When sunlight enters the projection lens, depending on the angle of incidence on the projection lens, the sunlight may be internally reflected (total internal reflection) on the projection lens and directed from the projection lens to each member placed inside the lamp's outer casing. There is sex.

At this time, if the sunlight emitted from the projection lens is concentrated on each member placed inside the outer casing of the lamp, especially if there is a large amount of sunlight incident, the concentrated part may melt. This may cause problems such as deformation or deformation. Particularly, when the member in the focused portion is made of a resin material, such a problem is likely to occur.

On the other hand, the lamp unit is a main component of a vehicle lamp, and it is desirable that the lamp unit be constructed with a small number of parts to reduce manufacturing costs.

In the vehicle lamp 1 configured as described above, there is a possibility that sunlight S transmitted through the cover 3 enters from the output surface 30 that is not blocked by the extension 55 (see FIG. 10). When sunlight S enters the projection lens 9, depending on the angle of incidence with respect to the projection lens 9, the sunlight S may be internally reflected on the entrance surface 29 and reach the lower surface portion 31c.

However, in the lamp unit 6, since the lower surface portion 31c is shielded from below by the light shielding piece 40, even when sunlight S passes through the lower surface portion 31c, it is blocked by the light shielding piece 40, and other parts of the lamp unit 6 It's difficult to get to that part.

As described above, in the lamp unit 6, the lower surface portion 31c of the projection lens 9 is formed as a covering surface portion, and the protector 10 is provided with the light shielding piece 40 that covers at least a portion of the lower surface portion 31c.

Therefore, at least a portion of the lower surface portion 31c of the projection lens 9 is covered by the light shielding piece 40 provided on the protector 10, so there is no need for a dedicated member to cover the lower surface portion 31c, and manufacturing costs can be reduced by reducing the number of parts. In addition, it is possible to prevent problems caused by sunlight S entering the projection lens 9.

In addition, although the example in which the lower surface portion 31c of the projection lens 9 is a covered surface portion covered by the light shielding piece 40 is shown above, at least one of the surface portions other than the lower surface portion 31c of the outer peripheral surface 31 of the projection lens 9 is The protector 10 may be provided with a light-shielding piece that is formed as a covering surface and covers at least a portion of the covering surface.

However, since the lower surface portion 31c of the projection lens 9 is formed as a covered surface portion, the surface portion that the sunlight S easily reaches is covered by the light shielding piece 40, so the direction of incidence of the sunlight S on the projection lens 9 is taken into consideration. Melting and deformation caused by sunlight S can be efficiently prevented.

Further, since the size of the light shielding piece 40 is made smaller than the size of the covering surface portion, it is possible to position the light shielding piece 40 in a state where it does not protrude outside the projection lens 9, and other structures of the light shielding piece 40 are possible. Melting caused by sunlight S can be prevented while avoiding contact with objects.

However, the light-shielding piece 40 may be made larger than the covering surface part as long as contact with other structures can be avoided.

Further, as described above, by forming the grains and steps on each part of the outer circumferential surface 31 of the projection lens 9, when sunlight is incident on the projection lens 9, the sunlight is diffused by the grains and steps. Even if the light passes through the projection lens 9, it is difficult to concentrate on each part arranged in the arrangement space 4a, and it is difficult for each part arranged in the arrangement space 4a to be melted or deformed by sunlight. Furthermore, by forming grains and steps on each part of the outer circumferential surface 31, each part arranged in the arrangement space 4a through the outer circumferential surface 31 becomes difficult to be seen from the outside of the vehicle lamp 1, thereby improving visibility. It is also possible.

Furthermore, as described above, by forming a gap between the lower surface portion 31c and the light shielding piece 40, the light shielding piece 40 does not come into contact with the lower surface portion 31c, thereby preventing damage to the lower surface portion 31c, which is a covered surface portion. can do.

Furthermore, in the vehicle, the projection lens 9 is easily visible from diagonally above the front, and the upper surface of the light shielding piece 40 is located in a position where it is easy to be seen through the projection lens 9, but as described above, the lower surface portion 31c has at least a grain or a step. One side is formed. Therefore, the external light that enters the projection lens 9 and reaches the lower surface portion 31c is diffused by the grain or step, making it difficult for the light shielding piece 40 to be seen through the projection lens 9, thereby improving visibility.

DESCRIPTION OF SYMBOLS 1... Vehicle lamp, 2... Lamp housing, 3... Cover, 4... Lighting outer casing, 4a... Arrangement space, 5... Cooling fan, 6... Lighting unit, 7... Lens holder, 8... Heat sink, 9... Projection lens, DESCRIPTION OF SYMBOLS 10...Protector, 23...Base part, 24...Radiation fin, 24a...Maximum heat radiation surface, 25...Circuit board, 26...Light source, 29...Incidence surface, 30...Emission surface, 31...Outer peripheral surface, 31c...Bottom surface part, 40 ... Light shielding piece 45 ... Rotating reflector

Claims (5)

a lamp outer casing configured by a lamp housing having an opening and a cover attached to the lamp housing with the opening closed, and having an internal space formed as an arrangement space;
a cooling fan attached to the lamp housing;
and a lighting unit arranged in the arrangement space,
The lamp unit includes a rotating reflector that reflects light emitted from a light source, a motor that rotates the rotating reflector, and a heat sink that releases heat generated when driving the light source,
the rotating reflector is located apart from a projection plane in the axial direction of the cooling fan;
A vehicular lamp, wherein at least a portion of the heat sink is located at a position overlapping the projection surface. The vehicular lamp according to claim 1, wherein the axial direction of the cooling fan and the axial direction of the rotary reflector are the same. The vehicular lamp according to claim 1 or 2, wherein the direction of flow of the cooling air generated by the cooling fan and the direction of flow of the air generated as the rotary reflector rotates are opposite to each other. The lamp unit is provided with a circuit board on which a light source is mounted,
The heat sink is provided with a base part on which the circuit board is disposed, and a plurality of heat radiation fins protruding from the base part and arranged side by side,
The heat dissipation fin is formed as the largest heat dissipation surface with the largest area on both sides in the thickness direction,
The vehicular lamp according to claim 1, wherein the maximum heat dissipation surface is parallel to the axial direction of the cooling fan. The vehicle according to Claim 1, Claim 2, Claim 3, or Claim 4, wherein the heat sink is provided with a flow regulating part that regulates the flow of cooling air generated by the cooling fan toward the rotating reflector. Lighting equipment.

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