JP2024019530A - Vehicular lighting fixture unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a vehicular lighting fixture unit.

SOLUTION: A vehicular lighting fixture unit includes: a light source unit 11 in which a light source 24 is mounted and a heat sink 25 is provided; a light amount control mechanism 26 having a movable shade 29 for switching a shielding amount of light emitted from the light source and a solenoid 31 for operating the movable shade; and a projection lens 9 for projecting the light emitted from the light source frontward. A rotary shaft 39 of the movable shade and an output shaft 32 of the solenoid are arranged so as to extend in the left and right direction respectively, and the rotary shaft of the movable shade and the output shaft of the solenoid are arranged between the projection lens and a focal point S of the projection lens. Thereby, the vehicular lighting fixture unit can be miniaturized.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to the technical field of reducing the size of a vehicle lamp unit.

2. Description of the Related Art Some vehicle headlamps include, for example, a lamp unit having a light source and the like disposed inside a lamp outer casing constituted by a cover and a lamp housing.

Some vehicle headlamp lamp units are provided with a light amount control mechanism that controls the amount of light emitted from a light source (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

The light amount control mechanism includes a movable shade that changes the amount of shielding of the amount of light emitted from the light source, and an actuator that operates the movable shade. In the vehicle headlights described in Patent Documents 1 to 3, for example, when the movable shade is rotated to the first position, the mode is switched to a low beam illumination mode that illuminates a short distance. By rotating the movable shade to the second position, the mode is switched to a high beam illumination mode for illuminating a long distance.

The light amount control mechanism is supported or attached to predetermined parts such as a connecting plate, a fixed arm, a light source unit, and a lens holder.

Japanese Patent Application Publication No. 2011-65960 Japanese Patent Application Publication No. 2011-119184 Japanese Patent Application Publication No. 2010-3589

By the way, in the type having a lighting unit such as the vehicle headlights described in Patent Documents 1 to 3, a light amount control mechanism that controls the amount of shielding of the light projected by the projection lens behind the projection lens is used. is provided.

Therefore, depending on the positional relationship between the projection lens and the light amount control mechanism, the overall length in the optical axis direction (front-rear direction) may become long, and the vehicle headlamp may become large.

Therefore, an object of the vehicle lamp unit of the present invention is to overcome the above-mentioned problems and to reduce the size of the vehicle lamp unit.

In order to solve the above-mentioned problems, a vehicle lighting unit includes a light source unit equipped with a light source and a heat sink, a movable shade that switches the amount of shielding of the light emitted from the light source, and a solenoid that operates the movable shade. and a projection lens that projects the light emitted from the light source forward, and the rotating shaft of the movable shade and the output shaft of the solenoid are arranged to extend in the left-right direction, respectively. The rotating shaft of the movable shade and the output shaft of the solenoid are arranged between the projection lens and the focal point of the projection lens.

Therefore, in the vehicle lighting unit, the rotation axis of the movable shade and the output shaft of the solenoid are arranged so as to extend in the left and right directions, and the movable shade is placed between the projection lens and the focal point of the projection lens. The rotation shaft of the solenoid and the output shaft of the solenoid are arranged.

The vehicle lamp unit of the present invention includes a light source unit equipped with a light source and a heat sink, a light amount control mechanism that includes a movable shade that switches the amount of shielding of light emitted from the light source, and a solenoid that operates the movable shade. , a projection lens that projects the light emitted from the light source forward, the rotation axis of the movable shade and the output axis of the solenoid are arranged so as to extend in the left-right direction, and the projection lens and the It is characterized in that the rotation axis of the movable shade and the output axis of the solenoid are disposed between the focal point of the projection lens.

Therefore, the rotation axis of the movable shade and the output axis of the solenoid are arranged so as to extend in the left-right direction, respectively, and the rotation axis of the movable shade and the output axis of the solenoid are arranged between the projection lens and the focal point of the projection lens. Therefore, the vehicle lamp unit can be made smaller.

An embodiment and a comparative example of the vehicle lamp unit of the present invention are shown together with FIGS. 2 to 8, and this figure is a schematic longitudinal sectional view. FIG. 3 is an exploded perspective view of the lamp unit. It is a perspective view of a lens holder. FIG. 3 is a perspective view showing a state in which a light amount control mechanism is assembled to a lens holder. FIG. 3 is an enlarged perspective view showing a state in which the movable shade is held at a first position. FIG. 7 is an enlarged perspective view showing a state in which the movable shade is held at a second position. A lens holder and a light amount control mechanism according to a comparative example are shown together with FIG. 8, and this figure is a perspective view showing a state before the light amount control mechanism is assembled to the lens holder. FIG. 3 is a perspective view showing a state in which the light amount control mechanism is assembled to the lens holder.

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

The vehicle headlights 1 are attached to both left and right ends of the front end of the vehicle body.

As shown in FIG. 1, the vehicle headlamp 1 includes a lamp housing 2 having a concave portion opened toward the front, and a cover 3 that closes the opening of the lamp housing 2. The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and an internal space of the lamp outer casing 4 is formed as a lamp chamber 5.

A mounting hole 2a is formed in the rear end of the lamp housing 2 and extends through the lamp housing 2 from front to back. A back cover 6 is attached to the attachment hole 2a.

A lamp unit 7 is arranged in the lamp room 5 (see FIGS. 1 and 2). The lamp unit 7 includes a lens holder 8, a projection lens 9 attached to the front end of the lens holder 8, a reflector 10 that reflects light, a light source unit 11 disposed below the reflector 10, and a light source unit 11 attached to the lower surface of the light source unit 11. It has a cooling fan 12.

The lens holder 8 includes an arc-shaped lens attachment part 13 that passes through the lens attachment part 13 in the front and back, side parts 14, 14 that project rearward from both left and right ends of the lens attachment part 13, and a holding part provided between the side parts 14, 14. 15 (see FIGS. 2 and 3).

The lens attachment portion 13 is formed in an arcuate shape with a downward opening.

The side portions 14, 14 are formed into plate shapes that face substantially in the left-right direction.

The holding part 15 includes a mounting surface section 16 facing in the vertical direction, bearing sections 17, 17 provided at the front end of the mounting surface section 16 spaced apart from each other in the left and right directions, an actuator mounting section 18 provided on the front side of the mounting surface section 16, and the mounting surface section 16. It has coupling protrusions 19, 19 that protrude downward from both the left and right ends, respectively.

The bearing portion 17 projects diagonally upward and forward from the mounting surface portion 16.

The actuator mounting portion 18 includes a receiving surface portion 20 facing in the front-rear direction, support protrusions 21, 21 protruding forward from each part of the outer periphery of the receiving surface portion 20, and a receiving surface portion 20 protruding forward from the upper end of the receiving surface portion 20. An engaging protrusion 22 is provided. Positioning holes 20a, 20a, 20a are formed in the receiving surface portion 20. The support protrusions 21, 21 are provided separated from each other in the left and right directions.

The projection lens 9 is formed into a substantially hemispherical shape and is attached to a lens attachment portion 13 of the lens holder 8 (see FIGS. 1 and 2).

The reflector 10 has an inner surface formed as a reflective surface 10a. The reflector 10 is attached to the top surface of the light source unit 11.

The light source unit 11 includes a circuit board 23 and a light source 24 mounted on the upper surface of the circuit board 23. As the light source 24, for example, a light emitting diode (LED) is used.

The light source unit 11 is provided with attached pieces 11a, 11a that protrude laterally (outward). The light source unit 11 is attached to the lens holder 8 by having the attached pieces 11a, 11a pressed against the coupling protrusions 19, 19 from the rear, respectively, and being coupled to the coupling protrusions 19, 19, respectively, by screws or the like.

The light source unit 11 is provided with a heat sink 25 located below the circuit board 23.

The cooling fan 12 is attached to the lower surface of the heat sink 25.

The portion of the light source unit 11 excluding the front end and the reflector 10 are arranged behind the focal point S of the projection lens 9 (see FIG. 1).

A light amount control mechanism 26 is assembled into the lens holder 8 from the front (see FIGS. 1, 2, and 4).

The light amount control mechanism 26 includes an actuator 27, a transmitting body 28, and a movable shade 29.

The actuator 27 has a yoke case 30, a coil body 31 disposed inside the yoke case 30, and an output shaft 32 that is movable in the left-right direction.

The yoke case 30 is in a horizontally elongated state, the coil body 31 has an axial direction in the left-right direction, and the output shaft 32 has an axial direction in the left-right direction, and a portion thereof projects laterally from the yoke case 30. The yoke case 30 is provided with positioning protrusions 30a, 30a, 30a that protrude rearward.

The transmission body 28 is connected to the end of the output shaft 32 that projects laterally from the yoke case 30. The transmission body 28 includes a supported portion 33 , a connecting portion 34 projecting downward from one side of the supported portion 33 , and a drive shaft 35 supported by the supported portion 33 .

The supported portion 33 is provided with a shaft support portion 33a that extends back and forth, and bearing portions 33b, 33b that are spaced apart from each other laterally and project rearward, respectively. The supported portion 33 is provided with a spring engaging protrusion 33c on one side. The lower end of the connecting portion 34 of the transmitting body 28 is connected to the output shaft 32 .

The drive shaft 35 is formed into a round shaft shape extending in the front-rear direction, and is rotatably supported by the shaft support portion 33a of the supported portion 33.

In the state where the transmission body 28 is connected to the output shaft 32, the actuator 27 is positioned by inserting the positioning protrusions 30a, 30a, 30a into the positioning holes 20a, 20a, 20a of the receiving surface 20, respectively, and attaching the actuator 27 to the receiving surface 20. It can be attached by tightening etc. At this time, the yoke case 30 is engaged with the engagement protrusion 22 and assembled to the actuator attachment part 18.

When the actuator 27 is assembled to the actuator mounting portion 18, the rotation shaft 39 is inserted into the bearing portions 33b, 33b of the transmission body 28, and the transmission body 28 and the rotation shaft 39 are connected. The transmission body 28 is movable in the axial direction of the rotation shaft 39.

The movable shade 29 has a light amount control section 29a formed in a substantially arcuate shape and connecting arms 29b, 29b that protrude substantially downward from positions near both left and right ends of the light amount control section 29a (FIG. 5). and Figure 6).

The movable shade 29 is provided with a driven part 36, which projects downward from the light amount control part 29a and is located between the connecting arms 29b, 29b. A first sliding surface 37 and a second sliding surface 38 are formed at the lower end of the driven part 36 and spaced apart from each other in the front and rear. A receiving recess 36a is formed which is opened substantially downward.

The first sliding surface 37 includes a first position-restricted surface 37a formed in a planar shape, a torsion surface 37b that twists and displaces downward as it moves away from the first position-restriction surface 37a laterally, and a torsion surface 37b. 37b, and a planar second position regulating surface 37c located on the opposite side of the first position regulating surface 37a.

The second sliding surface 38 includes a first position-restricted surface 38a formed in a planar shape, a torsion surface 38b that twists and displaces upward as it moves away from the first position-restriction surface 38a laterally, and a torsion surface 38b. It consists of a planar second position-restricted surface 38c located on the opposite side of the first position-restricted surface 38a with 38b in between.

The first position-restricted surface 38a of the second sliding surface 38 is located directly behind the second position-restricted surface 37c of the first sliding surface 37, and the second position-restricted surface 38a of the second sliding surface 38 The position-restricted surface 38c is located directly behind the first position-restricted surface 37a of the first sliding surface 37.

A rotation shaft 39 extending in the left-right direction is connected to the connecting arms 29b, 29b of the movable shade 29. When the movable shade 29 is connected to the rotation shaft 39, the rotation shaft 39 is inserted into the receiving recess 36a, and the first sliding surface 37 and the second sliding surface 38 are connected to the drive shaft 35 of the transmission body 28. from above.

The rotation shaft 39 is assembled to the bearing parts 17, 17 of the holding part 15.

The movable shade 29 is rotated about a rotation shaft 39 between a first position where a portion of the light emitted from the light source 24 is blocked and a second position where the amount of shielding is less than the first position. Ru. The first position is a low beam position that illuminates a short distance, and the light amount control section 29a of the movable shade 29 is in a substantially vertical state, and the second position is a high beam position that illuminates a long distance, and the movable shade 29 is in a vertical position. The light amount control section 29a is in an inclined state.

An urging spring 40, which is, for example, a compression coil spring, is supported on the rotation shaft 39 in an externally fitted manner.

One end of the biasing spring 40 is engaged with the lower surface of the light quantity control section 29a of the movable shade 29, and the other end is engaged with a spring engagement protrusion 33c provided on the supported section 33 of the transmission body 28. Therefore, the movable shade 29 is urged by the urging spring 40 in the direction of rotation from the second position to the first position.

When the rotation shaft 39 is inserted into the bearing parts 33b, 33b of the transmission body 28, both ends of the biasing spring 40 are connected to one connecting arm part 29b of the movable shade 29 and one bearing part of the transmission body 28, respectively. 33b. Therefore, the output shaft 32 of the actuator 27 is urged by the urging spring 40 via the transmission body 28 in a direction in which it is projected from the yoke case 30.

The movable shade 29 has first and second sliding surfaces 38 in contact with the drive shaft 35 of the transmission body 28 from above. At this time, when the movable shade 29 is rotated to the first position, the drive shaft 35 has the first position regulating surface 37a of the first sliding surface 37 and the second position regulating surface 37a of the second sliding surface 38. The position-restricted surface 38c of is in contact with the surface 38c. In addition, when the movable shade 29 is rotated to the second position, the drive shaft 35 is connected to the second position-restricted surface 37c of the first sliding surface 37 and the second position-restricted surface 37c of the second sliding surface 38. The position-restricted surface 38a of is in contact with the surface 38a.

The light amount control mechanism 26 configured as described above is arranged between the projection lens 9 and the focal point S of the projection lens 9 (see FIG. 1).

The lamp unit 7 is tiltably supported by the lamp housing 2 via an aiming adjustment mechanism (not shown). Therefore, the lamp unit 7 is tilted vertically or horizontally by the operation of the aiming adjustment mechanism, and the optical axis adjustment (initial adjustment) of the light source 24 is performed.

Further, the lamp unit 7 may be supported by the lamp housing 2 so as to be tiltable in the vertical direction, for example. When the lamp unit 7 is supported by the lamp housing 2 so as to be tiltable in the vertical direction, a leveling adjustment mechanism (not shown) is connected to the lamp housing 2, and the lamp unit 7 is tilted in the vertical direction by the operation of the leveling adjustment mechanism. The direction of the optical axis of the light source 24 is adjusted according to the weight of the vehicle-mounted items.

Further, the lamp unit 7 may be rotatable in the horizontal direction, for example. When the lamp unit 7 is rotatable in the horizontal direction, a swivel mechanism (not shown) is connected to the lamp unit 7, and the operation of the swivel mechanism causes the lamp unit 7 to rotate in the horizontal direction, thereby changing the direction in which the vehicle is traveling. The direction of the optical axis is changed according to

In the vehicle headlamp 1 configured as described above, when no driving current is supplied to the coil body 31 of the actuator 27, the output shaft 32 is projected from the yoke case 30 by the biasing force of the biasing spring 40. It is located at the end of movement in the direction of movement. At this time, no turning force is applied to the movable shade 29 in the direction from the first position to the second position, the transmitting body 28 is located at the left moving end, and the movable shade 29 is biased. The first position-restricted surface 37a of the first sliding surface 37 is pressed from above against the drive shaft 35 of the transmission body 28 by the spring 40 and held at the first position (see FIG. 5). In the first position, the second position-regulated surface 38c of the second sliding surface 38 is in contact with the drive shaft 35.

When light is emitted from the light source 24 while the movable shade 29 is in the first position, part of the light is blocked by the movable shade 29, and the unblocked light is incident on the projection lens 9. 9 projects light to form a low beam light distribution pattern that illuminates a short distance.

When the coil body 31 of the actuator 27 is energized, the output shaft 32 is moved in the direction of being drawn into the yoke case 30, and the transmission body 28 is moved to the right as the output shaft 32 moves. When the transmission body 28 is moved to the right, the drive shaft 35 slides on the first sliding surface 37 from the torsion surface 37b to the second position-restricted surface 37c, and the movable shade 29 moves from the first position to the second position-restricted surface 37c. It is rotated to position 2 (see Figure 6). At this time, the drive shaft 35 slides on the torsion surface 38b of the second sliding surface 38 and the first position regulating surface 38a. The movable shade 29 is held at the second position by the urging spring 40 pressing the second position-restricted surface 37c of the first sliding surface 37 against the drive shaft 35 from above.

By rotating the movable shade 29 to the second position, the amount of shielding of the light emitted from the light source 24 is reduced, and a high beam light distribution pattern that illuminates a long distance is formed.

When the current supply to the coil body 31 is stopped, the output shaft 32 is moved in the direction of protruding from the yoke case 30 by the urging force of the urging spring 40, and the transmission body 28 is moved to the left as the output shaft 32 moves. will be moved. When the transmission body 28 is moved to the left, the drive shaft 35 is slid on the first sliding surface 37 from the torsion surface 37b to the first position-restricted surface 37a, and the movable shade 29 is moved from the second position to the second position. It is rotated to position 1 (see Figure 5). At this time, the drive shaft 35 slides on the torsion surface 38b of the second sliding surface 38 and the second position regulating surface 38c. The movable shade 29 is held at the first position again by the biasing spring 40 pressing the first position-restricted surface 37a of the first sliding surface 37 against the drive shaft 35 from above.

As described above, the vehicle headlamp 1 having the light amount control mechanism 26 is configured so that the output shaft 32 of the actuator 27 is moved in the left-right direction and the movable shade 29 is rotated.

Therefore, the size of the actuator 27 in the longitudinal direction can be small, and the vehicle headlamp 1 can be made smaller in the longitudinal direction.

A comparative example of a lens holder and a light amount control mechanism will be described below (see FIGS. 7 and 8).

The lens holder 8A according to the comparative example includes a circular lens mounting portion 43 that is penetrated in the front and back, and side portions 44, 44 that project rearward from both left and right ends of the lens mounting portion 43, and are provided between the side portions 44, 44. It has a holding part 45 that is held in place.

The side portions 44, 44 are each formed into a plate shape facing substantially in the left-right direction.

The holding part 45 includes a mounting surface section 46 facing in the vertical direction, bearing sections 47, 47 provided at the front end of the mounting surface section 46 spaced apart from each other in the left and right directions, an actuator mounting section 48 provided at the front end side of the mounting surface section 46, and a mounting surface section. It has coupling protrusions 49, 49 that protrude downward from both left and right ends of 46, respectively.

A spring support protrusion 46a is provided on the upper surface of the mounting surface portion 46.

The bearing portion 47 projects upward from the mounting surface portion 46.

The actuator mounting portion 48 includes a receiving surface portion 50 facing in the front-rear direction, a supporting protrusion 51 protruding forward from the lower end of the receiving surface portion 50, and an engaging protrusion protruding upward from both left and right ends of the supporting protruding portion 51, respectively. 52, 52 are provided. Positioning holes 51a, 51a, 51a are formed in the support protrusion 51.

The light source unit 11 is attached to the lens holder 8A by having the attached pieces 11a, 11a pressed against the coupling protrusions 49, 49 from the rear, respectively, and being coupled to the coupling protrusions 49, 49, respectively, by screws or the like.

A light amount control mechanism 56 is assembled into the lens holder 8A from above.

The portion of the light source unit 11 excluding the front end and the reflector 10 are arranged behind the focal point S of the projection lens 9.

The light amount control mechanism 56 includes an actuator 57, a transmission member 58, and a movable shade 59.

The actuator 57 has a yoke case 60, a coil body 61 disposed inside the yoke case 60, and an output shaft 62 movable in the front-back direction.

The axial direction of the coil body 61 is in the front-rear direction, and the axial direction of the output shaft 62 is in the front-rear direction, and a portion thereof projects forward from the yoke case 60. The yoke case 60 is provided with positioning protrusions 60a, 60a, 60a that protrude downward.

The transmission member 58 is, for example, a wire-shaped member, and one end thereof is connected to the end of the output shaft 62 that projects forward from the yoke case 60 .

In the state where the transmission member 58 is connected to the output shaft 62, the actuator 57 is positioned by inserting the positioning protrusions 60a, 60a, 60a into the positioning holes 51a, 51a, 51a of the support protrusion 51, respectively. It can be attached by caulking etc. At this time, both side surfaces of the yoke case 60 are engaged with the engaging protrusions 52, 52, respectively, and the yoke case 60 is assembled to the actuator mounting portion 48.

When the actuator 57 is assembled to the actuator mounting portion 48, the other end of the transmission member 58 is connected to the connecting protrusion 59c, and the transmission member 58 and the movable shade 59 are connected.

The movable shade 59 includes a light amount control section 59a formed in a substantially arcuate shape, connecting arms 59b, 59b protruding substantially downward from positions near both left and right ends of the light amount control section 59a, and a light amount control section 59a in the left and right direction. It has a connecting protrusion 59c that protrudes substantially downward from the substantially central portion. The other end of the transmission member 58 is connected to the connecting protrusion 59c of the movable shade 59.

A rotation shaft 63 extending in the left-right direction is connected to the connecting arms 59b, 59b of the movable shade 59.

The rotation shaft 63 is assembled to the bearing parts 47, 47 of the holding part 45.

The movable shade 59 is rotated about a rotation axis 63 between a first position where it blocks a portion of the light emitted from the light source 24 and a second position where the amount of shielding is smaller than the first position. Ru. The first position is a low beam position that illuminates a short distance, and the light amount control unit 59a of the movable shade 59 is in a substantially vertical state, and the second position is a high beam position that illuminates a long distance, and the movable shade 59 has a high beam position that illuminates a long distance. The light amount control section 59a is tilted.

A biasing spring 64, which is, for example, a coil spring, is supported on the rotation shaft 63 in an externally fitted manner.

One end of the biasing spring 64 is engaged with the lower surface of the light amount control section 59a of the movable shade 59, and the other end is engaged with the spring support protrusion 46a provided on the mounting surface section 46 of the lens holder 8A. Therefore, the movable shade 59 is urged by the urging spring 64 in the direction of rotation from the second position to the first position.

When the transmission member 58 is connected to the movable shade 59, the movable shade 59 is biased by the biasing spring 64 in the direction in which the movable shade 59 is rotated from the second position to the first position. The biasing force of the biasing spring 64 is transmitted to the output shaft 62 of the actuator 57 via the transmission member 58, and the output shaft 62 is biased in the direction of protruding from the yoke case 60.

The light amount control mechanism 56 configured as described above is arranged between the projection lens 9 and the focal point S of the projection lens 9.

In the vehicle headlamp 1 having the lens holder 8A and the light amount control mechanism 56 configured as described above, when the drive current is not supplied to the coil body 61 of the actuator 57, the output shaft 62 is connected to the biasing spring 64. It is located at the moving end in the direction in which it is projected from the yoke case 60 by the urging force of. At this time, no rotation force is applied to the movable shade 59 in the direction from the first position to the second position, and the movable shade 59 is held at the first position by the biasing spring 64.

When light is emitted from the light source 24 while the movable shade 59 is in the first position, part of the light is blocked by the movable shade 59, and the unblocked light is incident on the projection lens 9. 9 projects light to form a low beam light distribution pattern that illuminates a short distance.

When the coil body 61 of the actuator 57 is energized, the output shaft 62 is moved in the direction of being drawn into the yoke case 60, and the transmission member 58 is moved rearward as the output shaft 62 moves. When the transmission member 58 is moved rearward, the movable shade 59 is rotated from the first position to the second position against the biasing force of the biasing spring 64.

By rotating the movable shade 59 to the second position, the amount of shielding of the light emitted from the light source 24 is reduced, and a high beam light distribution pattern that illuminates a long distance is formed.

When the current supply to the coil body 61 is stopped, the output shaft 62 is moved in the direction of protruding from the yoke case 60 by the urging force of the urging spring 64, and the transmission member 58 is moved forward as the output shaft 62 moves. be done. When the transmission member 58 is moved forward, the movable shade 59 is rotated from the second position to the first position by the biasing force of the biasing spring 64, and is held at the first position again.

As described above, the vehicle headlamp 1 having the light amount control mechanism 56 is configured so that the output shaft 62 of the actuator 57 is moved in the front-rear direction and the movable shade 59 is rotated.

Therefore, since the rotating direction of the movable shade 59 and the moving direction of the output shaft are the same, there is no need to provide an orthogonal transformation mechanism for rotating the movable shade 59 in the light amount control mechanism 26, and the parts The mechanism can be simplified by reducing the number of points.

As described above, in the vehicle headlamp 1, the light amount control mechanisms 26 and 56 are arranged between the projection lens 9 and the focal point S of the projection lens 9.

Therefore, the positional relationship between the projection lens 9 and the light amount control mechanisms 26, 56 is taken into consideration, and the light amount control mechanisms 26, 56 are arranged close to the projection lens 9, so that the total length in the optical axis direction (back and forth direction) is shortened. Therefore, the size of the vehicle headlamp 1 can be reduced.

In addition, since the portion of the light source unit 11 excluding the front end and the reflector 10 are arranged behind the focal point of the projection lens 9, the light amount control mechanism 26, the light source unit 11, and the reflector 10 do not interfere with each other, allowing proper operation. In addition, a desired light distribution pattern can be formed by the light emitted from the light source 24.

Furthermore, since the light source unit 11 is disposed below the reflector 10, the size of the vehicle headlamp 1 in the front-rear direction can be reduced accordingly.

Note that although the vehicle headlamp 1 having the reflector 10 has been shown as an example above, the present invention can also be applied to a so-called direct-light type vehicle headlamp that does not have a reflector. .

The shapes and structures of each part shown in the above-described detailed description are merely examples of embodiments of the present invention, and the technical scope of the present invention is limited by these. It must not be interpreted in a limited manner.

7...Light unit (vehicle light unit), 9...Projection lens, 11...Light source unit, 24...Light source, 25...Heat sink, 26...Light amount control mechanism, 29...Movable shade, 31...Coil body (solenoid), 32... Output axis, 39... Rotation axis, S... Focus of projection lens

Claims (4)

A light source unit including a heat sink and a light source with a light emitting surface facing upward above the heat sink;
a reflector that is placed above the light source unit and reflects the light emitted from the light source forward;
a projection lens that projects the light reflected by the reflector;
a movable shade that switches the amount of shielding of the light reflected by the reflector;
a rotation shaft around which the movable shade rotates;
an actuator that rotates the movable shade around the rotation axis;
a transmission body that rotates the movable shade around the rotation axis by transmitting the movement of the actuator to the movable shade;
The rotary shaft of the movable shade has a bearing part that is assembled in a state in which it extends in the left-right direction and supports the movable shade, and has a receiving surface part facing in the front-rear direction, and the actuator is mounted on the receiving surface part. a holding part for holding;
Equipped with
The movable shade is switched to one of two position states, a first position state and a second position state, by the actuator,
A vehicular lamp unit characterized in that a biasing spring for rotating the movable shade from the second position to the first position is attached to the rotation shaft. The vehicle lamp unit according to claim 1, wherein the biasing spring is disposed between the projection lens and a focal point of the projection lens. The heat sink and the cooling fan are arranged side by side in the vertical direction, and
2. The vehicle lamp unit according to claim 1, wherein the cooling fan is disposed below the heat sink. 2. The vehicular lamp unit according to claim 1, wherein the light amount control mechanism including the actuator, the movable shade, and the transmitting body is disposed between the projection lens and a focal point of the projection lens.

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