JP2022153695A - lamp unit - Google Patents

Abstract

To provide a small-sized lamp unit for performing optical scanning, which can illuminate an auxiliary illumination area as wide as possible.SOLUTION: A lamp unit HiU comprises: a scanning light source unit (first light source unit) 2; an optical scanning unit 3 that reflects light emitted from the scanning light source unit 2 and scans the light in a predetermined direction; an auxiliary light source unit (second light source unit) 4; a projection lens 5 that projects forward the scanned light and the light emitted from the auxiliary light source unit 2. The auxiliary light source unit 4 and the scanning light source unit 2 are arranged at different positions in the direction intersecting an optical scanning direction of the optical scanning section 3. The degree of freedom in arranging the auxiliary light source unit 4 is increased, and the auxiliary light source unit 4 can form a wide auxiliary illumination area.SELECTED DRAWING: Figure 11

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp unit suitable for use as an illumination lamp for vehicles such as automobiles, and more particularly to a lamp unit that scans light to obtain a desired light distribution.

As a lamp unit for automobile headlamps, there has been proposed a lamp unit that obtains a desired light distribution by scanning light in an area in front of the vehicle. Patent Document 1 proposes an optical unit that reflects light emitted from a first light source composed of an LED (light emitting diode) with a rotating reflector, and projects the reflected light toward the front of the vehicle with a projection lens. there is The rotating reflector is equipped with a light reflecting plate called a blade, and when the angle of the reflecting surface of this blade is changed as the blade rotates, the light from the light source can be deflected in the horizontal direction and reflected to perform scanning. . In addition, by controlling the lighting and extinguishing of the light source in accordance with the timing of this scanning, it is possible to illuminate only the desired area in front of the own vehicle without dazzling other vehicles. ) light distribution control can be realized.

JP 2018-67523 A

In the optical unit of Patent Document 1, the first light source is arranged at a position on a horizontal plane including the optical axis of the projection lens or at a position in the vicinity of this horizontal plane, and the first light source emits light in the horizontal direction, The rotary reflector is configured to reflect the emitted light while deflecting it in the horizontal direction for scanning. In addition, the technique of Patent Document 1 provides a second light source separately from the first light source, and projects the light from the second light source through a projection lens, so that the area surrounding and adjacent to the illumination area to be scanned is supplementary. It forms an auxiliary lighting area for proper lighting.

However, in the optical unit of Patent Document 1, the light from the second light source is emitted in the same horizontal direction as the light from the first light source, and the light is incident along substantially the same plane as the light from the first light source. A configuration is adopted in which the light source is arranged at one place on the same plane as the first light source. Therefore, it is difficult to reduce the horizontal dimension in which the first light source and the second light source are arranged, and it is difficult to reduce the size of the optical unit.

Further, in Patent Document 1, an inner lens is provided for condensing the light from the second light source to enter the projection lens in order to form an auxiliary illumination area. Since it is arranged on the same plane as the inner lens, it is difficult to secure a space for arranging the inner lens, and it is difficult to reduce the size of the optical unit.

On the other hand, in the optical unit of Patent Document 1, the second light source and the inner lens are arranged on the same plane as the first light source. Difficult to grow. That is, when the second light source is composed of a plurality of light emitting elements, it becomes difficult to arrange the plurality of light emitting elements horizontally. Therefore, a problem arises in that it becomes difficult to illuminate a horizontally wide auxiliary illumination area with the second light source.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact lamp unit capable of illuminating an auxiliary illumination area as wide as possible in a lamp unit that performs optical scanning.

The present invention provides a first light source unit, a light scanning unit that reflects light emitted from the first light source unit and scans the light in a predetermined direction, a second light source unit, the scanned light and the second light source unit. The lamp unit includes a projection lens that projects light emitted from the light source unit forward, and the second light source unit and the first light source unit are positioned at different positions in a direction intersecting the light scanning direction of the light scanning unit. are arranged.

In one aspect of the present invention, the first light source section, the light scanning section, and the projection lens are displaced in the vertical direction of the lamp unit, and the first light source section emits light obliquely upward or obliquely downward. The light scanning unit reflects the light obliquely upward or obliquely downward and enters the projection lens, and the second light source unit is disposed behind the projection lens and emits the light forward. It is configured to be incident on the projection lens.

In this form, the projection lens is formed of a lens whose dimension in the scanning direction when viewed from the front is longer than the dimension in the direction crossing the scanning direction, and the rear surface is configured as an incident surface for the light scanned by the optical scanning section. Also, the second light source section is configured to include a plurality of light sources arranged on both sides along the optical scanning direction of the first light source section. Furthermore, the optical scanning section is configured to scan the light from the first light source section in the horizontal direction of the lamp, and the light sources of the second light source section are arranged at two locations in the horizontal direction.

In the present invention, the second light source unit forms auxiliary light distribution patterns formed in areas adjacent to the left and right edges of the light distribution pattern formed by the first light source unit and the optical scanning unit. The second light source unit includes a plurality of condensing lenses corresponding to the plurality of light sources, respectively, and the plurality of condensing lenses are provided integrally with the projection lens.

INDUSTRIAL APPLICABILITY The present invention is applied, for example, to a headlamp of a vehicle capable of projecting light in a high beam light distribution pattern and an auxiliary high beam light distribution pattern adjacent to the high beam light distribution pattern. and the optical scanning unit form a high beam light distribution pattern, and the second light source unit forms an auxiliary light distribution pattern in an area adjacent to the high beam light distribution pattern.

According to the present invention, since the second light source section is disposed at a position different from the first light source section in the direction intersecting the light scanning direction of the optical scanning section, the second light source section and the first light source are arranged at different positions. It is possible to arrange the lamp unit in a state in which the portions are overlapped along a predetermined direction, and it is possible to reduce the size of the lamp unit in the light scanning direction and reduce the size of the lamp unit. Further, the second light source section can be arranged with a plurality of light sources in the optical scanning direction, and a wide auxiliary illumination area can be formed.

1 is a front view of an automobile to which the lamp unit of the present invention is applied; FIG. FIG. 2 is an exploded perspective view of the schematic configuration of the right headlamp; Schematic light distribution diagram of a headlamp. FIG. 3 is an external perspective view of the right Hi unit viewed from the front; FIG. 4 is an external perspective view of the right Hi unit as seen from the rear; The schematic front view of a right Hi unit. FIG. 2 is an exploded perspective view of the entire right Hi unit; FIG. 4 is an exploded perspective view of the configuration of a portion of the right Hi unit as seen from the rear side; FIG. 4 is a rear perspective view of the Hi unit with the optical scanning unit removed; The perspective view which looked at the auxiliary|assistant condensing lens from the back. FIG. 4 is a longitudinal sectional view for explaining light projection of the scanning light source section; FIG. 3 is a schematic optical path diagram for explaining light projection of a scanning light source unit; FIG. 4 is a vertical cross-sectional view for explaining light projection of the auxiliary light source section; FIG. 4 is a schematic optical path diagram for explaining light projection of an auxiliary light source unit;

Next, embodiments of the present invention will be described with reference to the drawings. In the following description, the up-down direction and the front-rear direction refer to the up-down direction and the front-rear direction of the lamp unit. The left-right direction is the direction when looking forward with respect to the vehicle, but the side near the center in the width direction of the vehicle body of the vehicle is sometimes called the inside, and the both sides in the width direction of the vehicle body are sometimes called the outside.

FIG. 1 is a front view of an automobile as a vehicle equipped with the lamp unit of the present invention. Headlamps HL are provided on the left and right sides of the front part of the vehicle body of the automobile CAR. The left headlamp HL(L) and the right headlamp HL(R) have a symmetrical configuration. Each headlamp HL includes a low beam lamp unit (hereinafter referred to as Lo unit) LoU that irradiates light with low beam distribution, a high beam lamp unit (hereinafter referred to as Hi unit) HiU that irradiates light with high beam distribution, and a turn lamp. It is configured as a combination type headlamp in which the lamp unit TSU of the signal lamp and the lamp unit CLU of the clearance lamp are installed. Here, the Hi unit HiU is configured as a left Hi unit HiU(L) for the left headlamp HL(L) and configured as a right Hi unit HiU(R) for the right headlamp HL(R). The clearance ramps may be configured as positioning ramps, daytime running ramps.

FIG. 2 is an exploded view of the schematic configuration of the right headlamp HL(R). Each lamp unit is housed in a lamp housing 100 composed of a lamp body 101 and a translucent cover 102 . The Lo unit LoU is configured as a triple Lo unit in which three Lo units are arranged in the vehicle width direction and integrally configured. The Hi unit HiU is configured as a scanning Hi unit to which the present invention is applied, particularly a unit that variably controls a high beam as one form of ADB, and is arranged inside the Lo unit LoU in the vehicle width direction. are configured inline.

The Lo unit LoU and the Hi unit HiU are covered with an extension 103 except for the light projection surface, and the lamp units TSU and CLU of the turn signal lamp and the clearance lamp are arranged in front of the extension 103. . These lamp units TSU, CLU are constructed as lamp units with lamp guides (light guides) which guide the light of the light source inside and emit the light from the side facing the front of the vehicle.

FIG. 3 is a schematic diagram for explaining the light distribution of the headlamp HL of the automobile CAR. The light distribution of the right headlamp HL(R) and the left headlamp HL(L) are almost the same, and the three Lo units LoU are arranged in the horizontal direction in the area below the horizontal line H, that is, in the vicinity area in front of the automobile. Wide illumination is performed to form a Lo (low beam) light distribution pattern PLo. The left and right Hi units HiU illuminate the area above the horizon H, that is, the far area in front of the vehicle, in a horizontally narrower area than the Lo light distribution pattern PLo to form a Hi (high beam) light distribution pattern PHi. The Hi unit HiU also forms a right auxiliary Hi light distribution pattern PS(R) and a left auxiliary Hi light distribution pattern PS(L) that auxiliaryly illuminate the right side area and the left side area of the Hi light distribution pattern PHi.

Lo light distribution pattern PLo, Hi light distribution pattern PHi, right auxiliary Hi light distribution pattern PS(R), and left auxiliary Hi light distribution pattern PS(L) by the left and right headlamps HL(R), HL(L) are superimposed on each other, the luminous intensity of each light distribution is added to perform lighting with the required brightness (illuminance).

The left and right Hi units HiU(R) and HiU(L) of the headlamps HL(R) and HL(L) described above will be described. Since both Hi units are bilaterally symmetrical, the right Hi unit HiU(R) will be described here. 4A is an external perspective view of the right Hi unit viewed from the front, FIG. 4B is an external perspective view of the right Hi unit viewed from the rear, and FIG. 4C is a schematic front view. 5 is an exploded perspective view of the whole, and FIG. 6 is an exploded perspective view of a part of the configuration as seen from the rear side.

In these figures, the right Hi unit HiU(R) has a heat sink 1 made of a highly thermally conductive material such as metal or ceramic. The heat sink 1 includes a plate-like base 11 whose upper edge is inclined forward, and a frame 12 integrally formed from both left and right sides of the base 11 to the upper side. A plurality of radiating fins 13 are integrally formed on the front surface of the base 11 so as to be aligned in the horizontal direction. Further, the heat sink 1 is formed with an aiming joint 14 to which an aiming mechanism (not shown) for adjusting the optical axis of the right Hi unit HiU(R) is engaged. omitted.

A scanning light source unit 2, an optical scanning unit 3, and an auxiliary light source unit 4 are assembled to the heat sink 1, and light emitted from these light source units 2 and 4 is projected toward the front of the vehicle. A projection lens 5 is assembled. The light from the scanning light source unit 2 is scanned by the optical scanning unit 3 and projected through the projection lens 5 to form the Hi light distribution pattern PHi. The left and right auxiliary Hi light distribution patterns PS(R) and PS(L) are formed by projecting the light from the auxiliary light source unit 4 directly through the projection lens 5. there is

The scanning light source section 2 is the first light source section in the present invention, and has a scanning light source substrate 21. On the surface of the scanning light source substrate 21, a plurality of LEDs (light emitting diodes) are provided as light emitting elements for emitting white light. Diodes) 22 are mounted in a state of being arranged in the left-right direction. Although three LEDs 22 are illustrated here, in practice, less or more LEDs may be mounted. This LED is called scanning LED2. Each scanning LED 22 is mounted so that its light emitting surface is parallel to the surface of the scanning light source substrate 21 or has a required angle. The scanning light source board 21 includes a wiring circuit 23 for controlling light emission of the scanning LEDs 22 and a connector 24 for connecting to an external power supply.

FIG. 7 is a rear perspective view of the Hi unit HiU with the optical scanning unit 3 removed. A scanning condenser lens block 25 is arranged on the scanning light source substrate 21 so as to face the light emitting surface of the scanning LED 22 . It is

The scanning condensing lens block 25 is integrally formed with a plurality of (three) condensing lenses (condenser lenses) 26 made of translucent resin. Each condensing lens 26 collects the light emitted from the light emitting surface of each scanning LED 22 arranged to face each other, and emits the light in a desired direction. Here, the light emitted from the light emitting surface of each scanning LED 22 is emitted rearward and obliquely upward as a vertically elongated luminous flux (light beam, light pencil) that suppresses lateral divergence.

The optical scanning unit 3 is composed of a rotating reflector that reflects the light of the scanning LED 2 condensed by the scanning condensing lens block 25 to perform optical scanning. This rotating reflector 3 has a casing 31 in which a motor 32 and two light reflecting blades 33 are housed. The motor 32 is tilted forward so that the rotary shaft 34 is directed obliquely forward and downward, and the light reflecting blade 33 is connected to the rotary shaft 34 . The casing 31 is fixedly supported by the frame 12 of the heat sink 1 with screws 202, and the rotating reflector 3 is arranged to face the scanning light source board 21 and the scanning condensing lens block 25 so as to cover them at their rear positions.

Each of the two light reflecting blades 33 is formed in a fan shape with a front surface configured as a light reflecting surface. be. The light reflecting surface of the light reflecting blade 33 is arranged behind the scanning condensing lens block 25 and faces the light emitting surface of the scanning LED 22 at a required angle.

The light reflecting surface of each light reflecting blade 33 reflects the light emitted from the light emitting surface of the scanning LED 22 forward. It is configured to be changed to For example, the surface angle decreases counterclockwise when viewed from the front surface of the rotating reflector 3 . As a result, the angle of incidence of the light from the scanning LED 22 on the light reflecting surface increases in the counterclockwise direction. Therefore, when the light reflecting blade 33 is rotated, the direction in which the light from the scanning LED 22 is reflected is continuously changed to the right.

The auxiliary light source unit 4 is a second light source unit in the present invention, and is a pair of auxiliary light source substrates 41 (R) and 41 (L) supported by the frame 12 at both sides sandwiching the scanning light source unit 2 in the horizontal direction. have. Substrate surfaces of the auxiliary light source substrates 41(R) and 41(L) are oriented substantially vertically, and auxiliary LEDs 42(R) and 42(L) that emit white light as light sources are provided on the front surfaces thereof. It is mounted facing forward. Each auxiliary light source substrate 41 (R), 41 (L) is fixed and supported by screws 203 from the rear surface side of the frame 12 of the heat sink 1 .

Auxiliary condensing lenses 43(R) and 43(L) are arranged in front positions of the auxiliary light source substrates 41(R) and 41(L), respectively. It is configured to condense the light emitted from and to emit forward and somewhat laterally deflected light. FIG. 8 is a rear perspective view of the auxiliary condenser lenses 43(R) and 43(L). , and support pieces 44(R) and 44(L) are integrally formed on a part thereof. Each support piece 44 is integrated with the left and right positions of the rear surface of the projection lens 5 by welding or adhesion.

The projection lens 5 is made of translucent resin. This projection lens 5 is based on a reference circle BC that constitutes a plano-convex spherical lens or an aspherical lens that is circular in front view and is circular in chain line in FIG. 4C. has a lens portion 51 formed mainly of a substantially semicircular lens directed upward. That is, the optical axis (the central axis of the reference circle BC) Lx of the projection lens 5 is oriented in the front-rear direction of the right Hi unit HiU(R), and the lens portion 51 is the upper half of the reference circle BC including the optical axis Lx. is left and the lower half is removed to form an approximately semicircular shape. In addition, the lens portion 51 has a shape in which portions of the left and right side surfaces and the upper surface are also partially removed. In this manner, the projection lens 5 has a reduced vertical dimension and a reduced horizontal dimension of the lens portion 51, thereby reducing the size and weight of the projection lens 5. As shown in FIG.

The projection lens 5 is supported on the frame 12 of the heat sink 1 by means of a mounting flange 52 integrally formed on the periphery of the lens portion 51 . Here, the mounting flange 52 is fixed and supported by screws 204 from the front side of the frame 12 at three locations. When the projection lens 5 is fixedly supported on the frame 12 in this manner, the auxiliary condenser lenses 43 (R) and 43 (L) integrated with the projection lens 5 are also fixedly supported on the frame 12 at the same time.

The relative positional relationship among the scanning light source section 2, the optical scanning section 3, the supplementary light source section 4, and the projection lens 5 described above and the configuration related thereto will be supplementarily explained. The scanning light source substrate 21 of the scanning light source unit 2 is arranged behind the projection lens 5 and directly below the area including the optical axis Lx. Particularly, here, among the three scanning LEDs 22 mounted on the scanning light source board 21, the center scanning LED is arranged directly below or in the vicinity of the optical axis Lx.

The optical scanning unit (rotating reflector) 3 is arranged at a position where the rotating shaft 34 of the motor 32 is displaced in the horizontal direction with respect to the scanning LED 22 . Here, the rotating shaft 34 is displaced to the left, that is, to the inside in the vehicle width direction. It will be positioned behind and above the scanning LEDs 22 when rotated and facing. Therefore, the light emitted from the scanning LED 22 can be reflected forward and obliquely upward and made incident on the rear surface of the projection lens 5, that is, the incident surface.

The auxiliary light source substrates 41 (R) and 41 (L) of the auxiliary light source unit 4 are positioned in the horizontal direction so as not to prevent the light of the scanning LEDs 22 reflected by the rotating reflector 3 from entering the incident surface of the projection lens 5, that is, They are arranged on both sides of the scanning light source substrate 21 in the left-right direction. Further, the auxiliary light source substrates 41(R) and 41(L) are arranged at substantially the same height as the incident surface of the projection lens 5 above the scanning light source section 2, and the auxiliary LEDs 42(R) and 42( L) and condensed by the auxiliary condensing lenses 43 (R) and 43 (L) are incident on the incident surface of the projection lens 5 . On the other hand, the lights of the left and right auxiliary LEDs 42(R), 412L) are arranged so as to be incident at predetermined angles with respect to the optical axis Lx of the projection lens 5 in the left and right directions.

The light projection action for forming the Hi light distribution pattern by the right Hi unit having the above configuration will be described. FIG. 9 is a longitudinal sectional view for explaining light projection of the scanning light source unit 2, and FIG. 10 is a schematic optical path diagram thereof. When the scanning LEDs 22 of the scanning light source unit 2 emit light, the light emitted from the light-emitting surface of each scanning LED 22 is suppressed by the scanning condensing lens block 25 to diverge, and is turned into a light flux that is close to parallel light and is directed obliquely backward and upward. emitted by At this time, the light emitted from the scanning condensing lens block 25 is emitted as a narrow luminous flux that is longer in the vertical direction than in the horizontal direction. The emitted light is projected obliquely downward onto the light reflecting blade 33 of the rotary reflector 3, where it is reflected obliquely forward and upward. Due to this reflection, a virtual image of the scanning LED 22, that is, a scanning LED image 22i as a virtual light source is formed behind the rotating reflector 3, and the reflected light is equivalently light emitted from this scanning LED image 22i. By adjusting the relative positions of the scanning LED 22 and the rotating reflector 3, the scanning LED image 22i is formed at a position near the focal point F on the incident surface side of the projection lens 5. FIG. For example, it is formed near the focal point F on the projection lens 5 side.

The light incident on the incident surface of the projection lens 5 is equivalent to the incident light from the scanning LED image 22i. projected towards. As shown in FIG. 10, the projected light from the three scanning LEDs 22 is projected as three strip-shaped light distribution patterns P1, P2, and P3 that are elongated in the vertical direction at a required interval in the horizontal direction.

When the rotating reflector 3 is driven and the light reflection blade 33 is rotated clockwise, the position of the light reflection blade 33 with respect to the projected light of the scanning LED 22 is changed in the circumferential direction and the surface angle is changed. be. As a result, the incident angle of light on the light reflecting blade 33 is changed outward in the vehicle width direction, and the reflected light is also deflected in the same direction. Accordingly, the strip-shaped light distribution patterns P1 to P3 by the scanning LEDs 22 are moved rightward in FIG. 10, and optical scanning is performed. When the light reflecting blade 33 rotates halfway, the other light reflecting blade performs similar light scanning. Light projection of the Hi light distribution pattern PHi is realized by repeating this light scanning by continuous rotation of the light reflecting blade 33 .

When the Hi light distribution pattern PHi is formed by this optical scanning, the scanning light source unit 2 controls the timing of light emission of the three scanning LEDs 22 to form a light shielding area where light is not projected within the Hi light distribution pattern PHi. and the ADB described above is implemented.

In this light projection, the light beams of the three scanning LEDs 22 incident on the projection lens 5 are incident obliquely upward in a region above the optical axis Lx of the incident surface, as shown in FIG. Therefore, only the portion above the optical axis Lx is used as a substantial lens. That is, even if the portion of the projection lens 5 below the optical axis Lx is removed, it still functions as a projection lens. Therefore, in this embodiment, as described above, the projection lens 5 has a shape based on a semicircular shape when viewed from the front, and the vertical dimension of the projection lens 5 is shortened.

In addition, the area in the horizontal direction of the Hi light distribution pattern PHi is the configuration of the surface angle of the light reflecting blade 33, that is, the area where the light reflected by the light reflecting blade 33 is deflected in the horizontal direction and is incident on the incident surface of the projection lens 5. determined by Therefore, when looking at the left-right direction of the projection lens 5, it is sufficient if there is a portion for the incident light to be emitted from the emission surface to form the Hi light distribution pattern PHi. Therefore, the left and right portions of the projection lens 5 are removed here. This is advantageous in achieving further miniaturization and weight reduction of the projection lens 5 .

On the other hand, FIG. 11 is a longitudinal sectional view for explaining light projection of the auxiliary light source section 4, and FIG. 12 is a schematic optical path diagram thereof. In the auxiliary light source unit 4, when the auxiliary LEDs 42(R) and 42(L) of the pair of auxiliary light source substrates 41(R) and 41(L) emit light, the emitted light passes through the auxiliary condenser lens 43(R). ) and 43 (L), and is incident on the incident surface of the projection lens 5 . Light from the auxiliary LEDs 42 (R) and 42 (L) is incident on both sides of the projection lens 5 with respect to the optical axis Lx in the left-right direction. The incident light is refracted by the projection lens 5 and deflected in the left-right direction to illuminate the front area.

By this irradiation, the light from the left auxiliary LED 42 (L) is irradiated to the right area of the Hi light distribution pattern PHi to form the right auxiliary Hi light distribution pattern PS (R). Also, the light from the right auxiliary LED 42(R) is applied to the left area of the Hi light distribution pattern PHi to form the left auxiliary Hi light distribution pattern PS(L).

Also in this light projection, the light from the two auxiliary LEDs 42(R) and 42(L) incident on the projection lens 5 is incident on a region above the optical axis Lx, so the projection lens 5 can be viewed from the front. A shape based on a semicircular shape may be used. Further, since it is sufficient for the auxiliary LEDs 42 (R) and 42 (L) to be incident on the projection lens 5 in the horizontal direction, the left and right portions of the projection lens 5 may be removed.

The left Hi unit HiU(L) arranged in the left headlamp HL(L) has a configuration symmetrical to the right Hi unit HiU(R) described above. However, the direction of optical scanning of the scanning light source section 2 by the rotating reflector 3 is the same as that of the right Hi unit. Note that the left Hi unit may have the same configuration as the right Hi unit.

As described above, in the Hi unit HiU of the embodiment, the scanning light source section 2 and the optical scanning section 3, that is, the scanning LED 22 and the rotating reflector 3 are arranged in the front-rear direction, and the light emitted from the scanning LED 22 is directed backward. The light is emitted obliquely upward and enters the rotating reflector 3 . Further, the light is reflected obliquely upward by the rotating reflector 3 and deflected in the horizontal direction for scanning. The scanned light is incident upward on the projection lens 5, and is refracted while being scanned in the horizontal direction by the projection lens 5 and projected.

Therefore, since the scanning light source section 2 and the optical scanning section 3 are arranged in the front-rear direction, the lateral dimension of the scanning light source section 2 and the optical scanning section 3 can be shortened, and a Hi unit with a small width can be obtained. . The light emitted from the scanning light source unit 2 is directed obliquely upward to the rear, and is reflected obliquely upward to the front by the rotating reflector 3 to enter the projection lens 5 . As a result, the optical path of the light from the scanning light source unit 2 to the projection lens 5 can be increased in both the front-rear direction and the vertical direction. The longitudinal dimension of the light source unit 2 and the optical scanning unit 3 combined can be shortened, and a Hi unit with a small depth dimension can be obtained.

In addition, the projection lens 5 can be configured based on a lens that is long in the optical scanning direction, that is, a semicircular lens that is elongated in the horizontal direction by removing the lower half of the circle, thereby reducing the vertical dimension of the projection lens 5. It can be made thinner. This prevents the height dimension of the Hi unit HiU from becoming significantly larger than that of the Lo unit LoU when the Hi unit HiU is incorporated in the housing 100 together with the Lo unit LoU to form an inline type headlamp HL. Therefore, the design of the Lo unit LoU and the Hi unit HiU can be unified, and the design effect of the headlamp HL can be enhanced.

On the other hand, the light source of the auxiliary light source unit 4 is composed of two auxiliary LEDs 42(R) and 42(L), and two auxiliary light source boards on which these auxiliary LEDs 42(R) and 42(L) are mounted. 41(R) and 41(L) are arranged separately at positions sandwiching the optical axis Lx of the projection lens 5 from left to right. Further, the auxiliary light source substrates 41 (R) and 41 (L) are arranged at positions facing the incident surface of the projection lens 5, but at positions different in the vertical direction from the light source substrate 21 of the scanning light source section 2. are arranged. Therefore, the arrangement positions of the two auxiliary light source substrates 41 (R) and 41 (L) are rarely restricted by the light source substrate 21 of the scanning light source section 2 and the rotating reflector 3 .

In addition, since the two auxiliary light source boards 41(R) and 41(L) on which the two auxiliary LEDs 42(R) and 42(L) are respectively mounted are independent, these auxiliary light source boards 41 (R), 41(L) and auxiliary LEDs 42(R), 42(L) have a degree of freedom in their positions. Therefore, compared to the configuration in which a plurality of LEDs are mounted on one substrate as in Patent Document 1, the auxiliary Hi light distribution pattern PS(R), which is illuminated by the light of the auxiliary LEDs 42(R) and 42(L), The degree of freedom in setting the position, area, etc. of PS(L) is also enhanced, and the widest possible auxiliary illumination area can be realized.

Furthermore, the lights of the auxiliary LEDs 42(R) and 42(L) are incident on the left and right positions of the incident surface of the projection lens 5 by the auxiliary condenser lenses 43(R) and 43(L), and are refracted by the projection lens 5. The light is projected onto each of the auxiliary Hi light distribution patterns PS(R) and PS(L). At this time, the light from the auxiliary LEDs 42 (R) and 42 (L) may be superimposed on the light from the scanning LED 22 of the scanning light source section 2 and enter the projection lens 5 . Therefore, the projection lens 5 only needs to have vertical and horizontal dimensions necessary for scanning the light from the scanning LEDs 42(R) and 42(L). The vertical and horizontal dimensions of the projection lens 5 do not increase in order to form PS(L).

The auxiliary condenser lenses 43 (R) and 43 (L) of the auxiliary light source section 4 are integrated with the projection lens 5 . Therefore, if the auxiliary condenser lenses 43(R), 43(L) and the projection lens 5 are positioned relative to each other at the time of integration, the projection lens 5 can be fixed and supported on the heat sink 1 automatically. The auxiliary condenser lenses 43(R) and 43(L) are positioned. Therefore, when the auxiliary light source substrates 41(R) and 41(L) are assembled to the heat sink 1, the auxiliary light source substrates 41(R) and 41(R) are mounted on the positioned auxiliary condenser lenses 43(R) and 43(L). , 41(L), which facilitates assembly work. Further, since the auxiliary light source substrates 41(R) and 41(L) are fixedly supported from behind the heat sink 1, the work thereof is also easy.

In the embodiment, the scanning light source unit 2 emits light obliquely upward to the rear, and the light scanning unit 3 reflects light obliquely upward to the front, but the vertical direction may be reversed. . That is, the scanning light source unit 2 may emit light obliquely downward in the rear, and the optical scanning unit 3 may reflect light obliquely downward in the front. In this case, the vertical positional relationship among the scanning light source unit 2, the optical scanning unit 3, and the projection lens 5 is reversed from that of the embodiment.

The light sources arranged on the left and right sides of the auxiliary light source unit 4, that is, the auxiliary LEDs 42(R) and 42(L) may be one or more LEDs. good. In this case, the LEDs are preferably arranged in the horizontal direction, but may be arranged in the vertical direction as long as the vertical dimension of the projection lens does not increase.

The auxiliary condensing lenses 43(R) and 43(L) may be provided integrally with the auxiliary light source substrates 41(R) and 41(L). In this case, if the auxiliary light source substrates 41(R) and 41(L) are fixed and supported on the heat sink 1, the auxiliary condenser lenses 43(R) and 43(L) are also fixed and supported on the heat sink 1 at the same time. Become.

HL, HL(R), HL(L) Headlamps HiU, HiU(R), HiU(L) High beam lamp unit LoU Low beam lamp unit PLo Low beam light distribution pattern PHi High beam light distribution pattern PS(R), PS(L) Auxiliary high beam light distribution pattern 1 Heat sink 2 Scanning light source unit (first light source unit)
3 Optical scanning unit (rotating reflector)
4 Auxiliary light source unit (second light source unit)
5 projection lens 21 scanning light source board 22 scanning LED
25 scanning condenser lens block 32 motor 33 light reflecting blades 41(R), 41(L) auxiliary light source substrates 42(R), 42(L) auxiliary LED
43(R), 43(L) auxiliary condenser lens 51 lens section

Claims (8)

a first light source unit, a light scanning unit that reflects light emitted from the first light source unit and scans the light in a predetermined direction, a second light source unit, the scanned light and the second light source unit wherein the second light source unit and the first light source unit have different directions intersecting the light scanning direction of the light scanning unit. A lamp unit arranged in position. The first light source unit, the light scanning unit, and the projection lens are displaced in the vertical direction of the lamp unit, and the first light source unit emits light obliquely upward or obliquely downward. The scanning unit reflects the light obliquely upward or obliquely downward and enters the projection lens, and the second light source unit is disposed behind the projection lens and emits the light forward. 2. The lamp unit according to claim 1, incident on said projection lens. The projection lens is formed of a lens whose dimension in the optical scanning direction when viewed from the front is longer than the dimension in the direction intersecting the light scanning direction, and the rear surface of the projection lens receives the light scanned by the optical scanning section and the light from the second light source section. 3. The lamp unit according to claim 2, which is configured as an incident surface, and wherein the second light source section is arranged behind the incident surface. 4. The lamp unit according to claim 3, wherein the second light source section includes a plurality of light sources arranged on both sides of the first light source section along the optical scanning direction. 5. The lamp according to claim 4, wherein the light scanning section scans the light from the first light source section in the horizontal direction of the lamp, and the light sources of the second light source section are arranged at two locations in the horizontal direction. unit. 2. The second light source unit forms an auxiliary light distribution pattern formed in regions adjacent to edges in a horizontal direction of the light distribution pattern formed by the first light source unit and the optical scanning unit. 6. The lamp unit according to any one of 1 to 5. 7. Any one of claims 4 to 6, wherein said second light source unit comprises a plurality of condenser lenses respectively corresponding to said plurality of light sources, and said plurality of condenser lenses are provided integrally with said projection lens. Lamp unit as described. It is applied to a vehicle headlamp capable of projecting light in a high beam light distribution pattern and in an auxiliary high beam light distribution pattern adjacent to the high beam light distribution pattern, wherein the first light source unit and the light scanning unit are capable of projecting light. 8. The high beam lamp unit according to any one of claims 1 to 7, wherein the high beam lamp unit forms a high beam light distribution pattern and forms an auxiliary light distribution pattern in a region adjacent to the high beam light distribution pattern in the second light source section. lamp unit.

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