CN112013350B - Vehicle lamp - Google Patents

Vehicle lamp Download PDF

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Publication number
CN112013350B
CN112013350B CN202010467470.4A CN202010467470A CN112013350B CN 112013350 B CN112013350 B CN 112013350B CN 202010467470 A CN202010467470 A CN 202010467470A CN 112013350 B CN112013350 B CN 112013350B
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CN
China
Prior art keywords
lamp
vehicle
projection lens
light modulator
spatial light
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Application number
CN202010467470.4A
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Chinese (zh)
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CN112013350A (en
Inventor
本多贵彦
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Publication of CN112013350A publication Critical patent/CN112013350A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/076—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle by electrical means including means to transmit the movements, e.g. shafts or joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/50—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating other intentions or conditions, e.g. request for waiting or overtaking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Abstract

The invention provides a vehicle lamp which enlarges respective irradiation ranges when realizing both variable light distribution patterns and road surface drawing. A vehicle lamp (1) is provided with a lamp unit (4), and the lamp unit (4) is provided with: a light source (13); projection lenses (16 a-16 c); and a spatial light modulator (17) that includes a plurality of reflective elements each having a tiltable reflective surface (17 a) and that reflects light of the light source toward the projection lens, wherein at least one of the spatial light modulator (17) and the projection lenses (16 a to 16 c) is formed so as to be displaceable such that a center (17 b) of the spatial light modulator (17) is located either above or below a rear focal point (P1) of the projection lenses (16 a to 16 c).

Description

Vehicle lamp
Technical Field
The present invention relates to a light distribution variable headlamp or a vehicle lamp for performing road surface drawing.
Background
Patent document 1 discloses, for example, paragraph [0017] and fig. 1, a lamp unit that displays a light distribution pattern of a predetermined shape in front of a vehicle by modulating light from a light source by a spatial light modulator and reflecting the light toward a projection lens.
A spatial light modulator such as a DMD (Digital Micromirror Device) included in a lamp unit can perform front display having a predetermined shape and color depth, that is, front light display or road surface display in front of a vehicle by modulating and reflecting light from a light source independently for each of a plurality of reflecting elements and transmitting the light through a projection lens.
Since the spatial light modulator is arranged so that the center of the spatial light modulator is positioned on the optical axis of the projection lens in the front display of the lamp unit in patent document 1, the HV point (the intersection point where the optical axis of the projection lens and the virtual screen are orthogonal) of the test screen (the virtual vertical plane orthogonal to the optical axis of the light source of the lamp unit) displayed in front is assumed to be irradiated to the front of the vehicle in a uniform range from the top to the bottom and from the left to the right.
With such forward display, the lamp unit of patent document 1 displays a variable light distribution pattern having a predetermined shape in front of the vehicle by displaying the pattern above an H-H line (a horizontal line passing through the HV point along the surface of the test screen) on the test screen, and displays a road surface having a predetermined shape on a road surface diagonally forward and downward of the vehicle by displaying the pattern below the H-H line.
Documents of the prior art
Patent literature
Patent document 1: japanese unexamined patent publication No. 2016-219279
Disclosure of Invention
Technical problems to be solved by the invention
The lamp unit disclosed in patent document 1 can realize the function of both the light distribution variable headlamp and the road surface drawing unit by displaying forward on either the upper side or the lower side of the H-H line. However, the lamp unit of patent document 1 can use only half of the entire irradiation area displayed forward when realizing the function of the light distribution variable headlamp or the road surface drawing unit, and therefore has a problem in that the irradiation area is narrow for both the variable light distribution pattern and the road surface drawing display.
In view of the above, the present application provides a vehicle lamp in which the respective irradiation ranges are expanded in the realization of both the variable type light distribution pattern and the road surface drawing.
Means for solving the problems
A vehicle lamp has a lamp unit, and the lamp unit includes: a light source; a projection lens; and a spatial light modulator which has a plurality of reflecting elements and reflects light of the light source toward the projection lens, wherein the plurality of reflecting elements each have a tiltable reflecting surface, and at least one of the spatial light modulator and the projection lens is formed so that a center of the spatial light modulator can be displaced to be positioned at any one of an upper side and a lower side of a rear focal point of the projection lens.
The center of the spatial light modulator is arranged above the rear focal point of the projection lens by relatively displacing the spatial light modulator and the projection lens, so that the lamp unit draws and displays the road surface on the front of the vehicle by using more than half of the irradiation area displayed in the front, and the center of the spatial light modulator is arranged by displacing the center of the spatial light modulator to the lower side of the rear focal point of the projection lens, so that the lamp unit irradiates the variable light distribution pattern to the front space of the vehicle by using more than half of the irradiation area displayed in the front.
In addition, it is preferable that at least one of the spatial light modulator and the projection lens is formed so that a center of the spatial light modulator can be displaced from a vertical direction of a rear focal point of the projection lens to be positioned on either one of a left side and a right side.
By relatively displacing the spatial light modulator and the projection lens, the center of the spatial light modulator is disposed to the left of the rear focal point of the projection lens, and the lamp unit displays the variable light distribution pattern or the road surface drawing of more than half of the irradiation region using the forward display to the diagonally right front of the vehicle, and by disposing the center of the spatial light modulator to the right of the rear focal point of the projection lens, the lamp unit displays the variable light distribution pattern or the road surface drawing of more than half of the irradiation region using the forward display to the diagonally left front of the vehicle.
In addition, it is preferable that the vehicle lamp includes a plurality of lamp units, and the vehicle lamp is formed so that at least one of the spatial light modulator and the projection lens of each lamp unit can be independently displaced for each lamp unit.
Each lamp unit performs independent front irradiation.
In addition, it is preferable that the vehicle lamp is formed so that at least one of the spatial light modulator and the projection lens can be automatically moved according to a driving condition of the vehicle.
The lamp unit automatically displays at least one of a variable light distribution pattern and a road surface drawing for a shape and an area according to a driving condition of the vehicle in front of the vehicle.
In addition, it is preferable that the vehicle lamp is formed so that at least one of the spatial light modulator and the projection lens can be manually moved.
The lamp unit displays at least one of a variable light distribution pattern for a shape or an area by a manual operation and a road surface drawing in front of the vehicle.
Effects of the invention
According to the vehicle lamp, it is possible to realize both the variable type light distribution pattern and the road surface drawing and to expand the respective irradiation ranges.
Further, according to the vehicle lamp, it is possible to realize both a variable light distribution pattern and a road surface drawing having a large irradiation range in either the oblique left direction or the oblique right direction of the vehicle.
Further, according to the vehicle lamp, it is possible to perform display of the variable light distribution pattern synthesized by forward display of each lamp unit, display of synthesized road surface drawing, or display of the variable light distribution pattern simultaneously with road surface drawing.
Further, according to the lamp unit, at least one of the optimum variable light distribution pattern and the road surface drawing display according to the environment of the running vehicle is automatically displayed in front of the vehicle.
Further, according to the lamp unit, at least one of the optimum variable light distribution pattern and the road surface drawing display corresponding to the operation based on the determination by the driver or the like is automatically displayed in front of the vehicle.
Drawings
Fig. 1 is a front view relating to an embodiment of a vehicular lamp.
Fig. 2 (a) is a sectional view taken along line I-I in fig. 1, in which the DMD lamp unit is longitudinally cut. Fig. 2 (b) is a diagram of arrow a of the DMD module viewed from the front.
Fig. 3 (a) is a vertical sectional view of a modified example of the DMD lamp unit, which is cut in the vertical direction. Fig. 3 (B) is a view of arrow B of the projection lens module as viewed from the front.
Fig. 4 is a block diagram showing a control device of the DMD lamp unit according to embodiment 1.
Fig. 5 (a) is an explanatory diagram of a conventional irradiation range of the DMD lamp unit.
Fig. 5 (b) is an explanatory view showing an irradiation range of the variable light distribution pattern of the DMD lamp unit according to the present embodiment. Fig. 5 (c) is an explanatory view showing an irradiation range of a road surface drawing display of the DMD lamp unit of the present embodiment.
Fig. 6 (a) is an explanatory view showing an irradiation range when the variable light distribution pattern by the DMD lamp unit of the present embodiment is displayed while being rotated leftward. Fig. 6 (b) is an explanatory view showing an irradiation range when the DMD lamp unit of the present embodiment is caused to display a road surface drawing in a rightward rotation.
Fig. 7 (a) is a front view of a pair of right and left vehicle lamps in the present embodiment. Fig. 7 (b) is an explanatory view of the irradiation range synthesized by the pair of right and left DMD lamp units.
Description of the symbols
1. Vehicle lamp
4. 4' DMD lamp unit
13. Light source
16a to 16c first to third lenses (projection lenses)
17. Spatial light modulator
17a movable reflecting surface
17b center
25. Vehicle lamp
29. Spatial light modulator
29a movable reflecting surface
29b center
31a to 31c first to third lenses (projection lenses)
Rear focal point of P1, P2 projection lens
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to fig. 1 to 7. In the drawings, the direction of the road (upward: downward: left: right: front: rear = Up: lo: le: ri: fr: re) as viewed by the driver of a vehicle (not shown) equipped with the vehicular lamp will be described.
The vehicle lamp 1 is an example of a left headlamp, and includes a lamp body 2 having an opening on a vehicle front side, and a transparent or translucent front cover 3 that closes the opening. Inside a lamp chamber S formed inside the lamp body 2 and the front cover 3, a DMD (Digital Micromirror Device) lamp unit 4, a low-beam lamp unit 5, an alignment bracket 6, a rotating unit 7, a plurality of alignment bolts 8, an extended reflector 9, and a control Device 10 are housed.
The DMD lamp unit 4 shown in fig. 1 and 2 (a) includes: a control device 10, a rotating bracket 12, a light source 13 including a light emitting element such as an LED or a laser diode, a reflector 14 having a parabolic reflecting surface 14a, a DMD module 15, and a projection lens module 16.
The control device 10 shown in fig. 2 (a) controls the on/off of the light source 13 and the operation of the rotating unit 7 and the DMD module 15. A light source 13, a mirror 14, a DMD module 15, and a projection lens module 16 are mounted on the rotating carriage 12. The light source 13 and the reflector 14 are attached to the inner wall of the attachment hole 12a of the rotating bracket 12, the DMD module 15 is attached to the rear end portion of the rotating bracket 12, and the projection lens module 16 is attached to the vicinity of the front end portion of the rotating bracket 12.
As shown in fig. 2 (b), the DMD module 15 includes: the spatial light modulator 17, the substrate 18, the substrate holder 19, the up-down slide mechanism 20, and the left-right slide mechanism 21. The spatial light modulator 17 is composed of a micro mirror group including a plurality of fine movable reflecting surfaces 17a arranged in a lattice shape in the vertical and horizontal directions and capable of tilting. Each movable reflecting surface 17a is independently controlled by the control device 10 to switch between on (a state where light from the light source is incident on the projection lens by reflection of the micromirror) and off (a state where light from the light source is not incident on the projection lens, that is, a state where light from the light source is reflected by the micromirror to the outside of the projection lens to disable incidence on the projection lens), and displays an optical image composed of a combination of lighted portions. The substrate 18 is held by the substrate holder 19 in a state where the spatial light modulator 17 is mounted.
Both the vertical slide mechanism 20 and the horizontal slide mechanism 21 shown in fig. 2 (b) are ball screw mechanisms, and include: electric motors (20 a, 21 a); rotary external threads (20 b, 21 b) that are rotated about axes (L2, L3) by motors (20 a, 21 a); female screw portions (20 c, 21 c) that are screwed to the rotating male screws (20 b, 21 b); hollow tubular portions (20 d, 21 d) formed to protrude from the female screw portions (20 c, 21 c) in the direction of axes (L4, L5) orthogonal to the axes (L2, L3), respectively; and telescopic sections (20 e, 21 e) that are provided around the inside of the tubular sections (20 d, 21 d) and that are telescopic in the direction along the axes (L4, L5). The stretchable portion 20e is integrated with the left end portion 19a of the substrate holder 19, and the stretchable portion 21e is integrated with the lower end portion 19b of the substrate holder 19.
As shown in fig. 2 (b), the vertical slide mechanism 20 fixes the motor 20a to the rotating bracket 12 in a state where the axis L2 is vertical and the tube portion 20d is rightward, and the horizontal slide mechanism 21 fixes the motor 21a to the rotating bracket 12 in a state where the axis L3 is horizontal and the female screw portion 21c is raised upward from the rotating bracket 12 and the tube portion 21d is upward. With the spatial light modulator 17 of fig. 2 (b) integrated with the substrate holder 19, the internal thread portion 20c, the tube portion 20d, and the expansion/contraction portion 20e move up and down and the expansion/contraction portion 21e moves up and down within the tube portion 21d in accordance with the driving of the motor 20a of the up-down sliding mechanism 20, so that the spatial light modulator 17 slides up and down. Further, the internal thread portion 21c, the tube portion 21d, and the expansion/contraction portion 21e move left and right and the expansion/contraction portion 20e moves left and right within the tube portion 20d in accordance with the driving of the motor 21a of the left/right slide mechanism 21, whereby the spatial light modulator 17 slides left and right. The motors (20 a, 21 a) are driven and controlled by the control device 10 in fig. 2 (a), and the spatial light modulator 17 is slid to a predetermined position in the vertical, horizontal, or diagonal directions by the control of the control device 10.
The projection lens module 16 shown in fig. 2 (a) includes a first lens 16a which is biconvex, a second lens 16b which is biconcave, a third lens 16c which is planoconvex, a lens holder 16d, and a mount 16e from the rear to the front, and the first to third lenses (16 a to 16 c) are fixed to the lens holder 16d in a state of being arranged in order from the rear with a space therebetween. The lens holder 16d is mounted on the rotating bracket 12 via the base 16 e.
The swivel bracket 12 shown in fig. 2 (a) is integrally mounted on a motor drive shaft 7a that automatically swivels about an axis L1 extending vertically along the swivel unit 7, and a support shaft 16f coaxial with the motor drive shaft 7a (the axis L1) is provided on the upper surface of the lens holder 16d. The rotating unit 7 is supported by the lower end portion 6a of the alignment bracket 6 in a state where the rotating bracket 12 is supported, and the support shaft 16f of the lens holder 16d is rotatably supported by the support hole 6c of the upper end portion 6b of the alignment bracket 6. The lower end portion 6a is integrated with the upper end portion 6b via a base end portion 6d on which the control device 10 is mounted, and the base end portion 6d is attached to the lamp body 2 so as to be tiltable with respect to the lamp body 2 by a plurality of (3 in the present embodiment) alignment bolts 8.
The light source 13, the mirror 14, the DMD module 15, and the projection lens module 16 integrated with the rotating bracket 12 of fig. 2 (a) integrally rotate around the axis L1 in accordance with the rotation of the motor drive shaft 7a of the rotating unit 7 controlled by the control device 10, and rotate left and right. The inside of the lamp chamber other than the low-beam lamp unit 5 and the first to third lenses (16 a to 16 c) of the projection lens module 16 in fig. 1 is shielded from the front by the extension mirror 9 in fig. 2 (a).
The mirror 14 in fig. 2 (a) is disposed so as to face both the light source 13 and the spatial light modulator 17 of the DMD module 15, and the spatial light modulator 17 is disposed so as to face the first lens 16 a. Outgoing light B1 generated by the light source 13 is reflected by the mirror 14 to the entire area of the spatial light modulator 17, and the spatial light modulator 17 reflects the light B1 to the first lens 16a of the projection lens module 16 via a plurality of movable reflection surfaces 17a that are turned on based on the control of the control device 10. The reflected light B1 passes through the first to third lenses (16 a to 16 c) and the front cover 3 in this order, and irradiates a variable light distribution pattern having a predetermined shape obtained by combining reflection portions (light-on portions) of the plurality of movable reflecting surfaces 17a that are turned on, or performs road surface drawing, in front of the vehicle (not shown).
The center 17b of the spatial light modulator 17 shown in fig. 2 (a) and 2 (b) is disposed at a common back focal point P1 located on the optical axis L0 of the first to third lenses (16 a to 16 c) at the initial position. The center 17b of the spatial light modulator 17 moves in an oblique direction above or below, and to the left or right, of the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c) based on the operations of the vertical slide mechanism 20 and the horizontal slide mechanism 21 controlled by the control device 10.
Next, fig. 3 (a) and (b) illustrate a modified example of the DMD lamp unit of this embodiment. The DMD lamp unit 4 shown in fig. 2 (a) is a mechanism having the DMD module 15 for sliding the spatial light modulator 17 up and down and right and left with respect to the projection lens module 16 fixed to the rotating bracket 12, and the DMD lamp unit 26 shown in fig. 3 (a) and (b) is a mechanism having the projection lens module 31 for sliding the first to third projection lenses (32 a to 32 c) up and down and right and left with respect to the spatial light modulator 29 of the DMD module 28 fixed to the rotating bracket 27.
The DMD lamp unit 26 incorporated in the vehicle lamp 25 shown in fig. 3 (a) and (b) has the same configuration as the DMD lamp unit 4 except that the configurations of the rotating bracket 27, the DMD module 28, and the projection lens module 31 are different from the configurations of the rotating bracket 12, the DMD module 15, and the projection lens module 16 shown in fig. 2 (a) and (b).
A light source 13, a mirror 14, a DMD module 28, and a projection lens module 31 are mounted on a rotating bracket 27 shown in fig. 3 (a). The light source 13 and the reflector 14 are respectively mounted on the inner wall of the mounting hole 27a of the rotating bracket 27. The DMD module 28 is configured by mounting a spatial light modulator 29 on a substrate 30, and the substrate 30 is attached to a standing wall portion 27b extending upward from the rear end portion of the rotating bracket 27 in a state where the spatial light modulator 29 faces forward.
A projection lens module 31 shown in fig. 3 (a) is attached near the front end of the rotating bracket 27. The projection lens module 31 includes a biconvex first lens 31a, a biconcave second lens 31b, a planoconvex third lens 31c, a lens holder 31d, a vertical slide mechanism 32, and a horizontal slide mechanism 33 from the rear to the front. The first to third lenses (31 a to 31 c) are fixed to the lens holder 31d in a state of being disposed in order from the rear with a space therebetween. The lens holder 31d is mounted on the rotary bracket 27 via the vertical slide mechanism 32 and the horizontal slide mechanism 33.
The vertical slide mechanism 32 and the horizontal slide mechanism 33 in fig. 3 (b) are both ball screw mechanisms, and include: motors (32 a, 33 a); rotary male screws (32 b, 33 b) which are rotated about axes (L2 ', L3') by motors (32 a, 33 a); internal screw thread portions (32 c, 33 c) screwed with the rotary external screws (32 b, 33 b); hollow tubular portions (32 d, 33 d) formed to protrude from the female screw portions (32 c, 33 c) in the direction of the axes (L4 ', L5') orthogonal to the axes (L2 ', L3'), respectively; and telescopic sections (32 e, 33 e) that are provided around the inside of the tubular sections (32 d, 33 d) and that are telescopic in a direction along the axes (L4 ', L5'). The expansion/contraction portion 32e is integrated with the left end portion 31e of the lens holder 31d, and the expansion/contraction portion 33e is integrated with the lower end portion 31f of the lens holder 31d.
As shown in fig. 3 (b), the vertical slide mechanism 32 fixes the motor 32a to the rotating bracket 27 in a state in which the axis L2 'is vertical and the tube portion 32d is rightward, and the horizontal slide mechanism 33 fixes the motor 33a to the rotating bracket 27 in a state in which the axis L3' is horizontal and the female screw portion 33c is raised upward from the rotating bracket 27 and the tube portion 33d is upward. As for the first to third lenses (31 a to 31 c) of fig. 3 (b) integrated with the lens holder 31d, the female screw portion 32c, the tube portion 32d, and the expansion/contraction portion 32e are moved up and down and the expansion/contraction portion 33e is moved up and down in the tube portion 33d in accordance with the driving of the motor 32a of the up-down sliding mechanism 32, whereby the first to third lenses (31 a to 31 c) are slid up and down. Further, the female screw portion 33c, the tube portion 33d, and the expansion/contraction portion 3e move left and right and the expansion/contraction portion 32e moves left and right within the tube portion 32d as the motor 33a of the left/right slide mechanism 33 is driven, whereby the first to third lenses (31 a to 31 c) slide left and right. The motors (32 a, 33 a) are driven and controlled by the control device 10 of fig. 3 (a), and the first to third lenses (31 a to 31 c) slide to predetermined positions in the vertical, horizontal, or oblique directions under the control of the control device 10.
The rotary bracket 27 in fig. 3 (a) is supported by the motor drive shaft 7a of the rotary unit 7 from below and rotates about an axis L1' extending vertically. The rotation unit 7 is supported by the alignment bracket 6 in a state of supporting the rotation bracket 12, and is attached to the lamp body 2 by a plurality of (three in the present embodiment) alignment bolts 8 so as to be tiltable. The light source 13, the mirror 14, the DMD module 28, and the projection lens module 31 integrated with the rotating bracket 27 integrally rotate around the axis L1 in accordance with the rotation of the motor drive shaft 7a of the rotating unit 7 controlled by the control device 10, and rotate left and right.
As shown in fig. 3 (a), the light B2 emitted from the light source 13 is reflected by the mirror 14 over the entire area of the spatial light modulator 29, and the light B2 is re-reflected toward the projection lens module 31 by the plurality of movable reflective surfaces 29a that are tiltable and turned on under the control of the control device 10. The re-reflected light B2 passes through the first to third lenses (31 a to 31 c) and the front cover 3 in this order, and is irradiated with a variable light distribution pattern having a predetermined shape or used for drawing a road surface.
The center 29b of the spatial light modulator 29 shown in fig. 3 (a) and 3 (b) is disposed at the common back focal point P2 located on the optical axis L0' of the first to third lenses (31 a to 31 c) in the initial position. The center 29b moves in an oblique direction above or below, to the left or right, or in a direction inclined to the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c) in accordance with the operations of the vertical slide mechanism 32 and the horizontal slide mechanism 33 controlled by the control device 10.
Next, the control device 10 will be described with reference to fig. 4. The control device 10 includes a lamp ECU (electronic control unit) 36, a ROM 37, and a RAM 38. The lamp ECU36 includes a light source control unit 39, a DMD control unit 40, a slide control unit 41, and a rotation control unit 42. Various control programs are recorded in the ROM 37, and the lamp ECU36 executes the control programs recorded in the ROM 37 in the RAM 38 to generate various control signals.
The light source control unit 39 in fig. 4 is connected to the light source 13 in fig. 2 (a). The DMD control unit 40 is connected to the plurality of movable reflecting surfaces 17a of the spatial light modulator 17 (in the modified example, the plurality of movable reflecting surfaces 29a of the spatial light modulator 29) via the movable mirror control circuit 43. The slide control unit 41 is connected to a motor 20a of the vertical slide mechanism 20 (in the modification, the motor 32a of the vertical slide mechanism 32) and a motor 21a of the horizontal slide mechanism 21 (in the modification, the motor 33a of the horizontal slide mechanism 33). The rotation control unit 42 is connected to a rotation driving unit 44 serving as a driving source (a motor not shown) for driving the motor driving shaft 7a of the rotation unit 7 shown in fig. 2 (a).
The light source control unit 39 of fig. 4 turns on or off the light source 13 based on a control signal of the lamp ECU 36. The DMD control unit 40 turns on the movable reflecting surface 17a that reflects the light of the light source and causes the light to enter the projection lens, and turns off the movable reflecting surface 17a that does not reflect the light of the light source toward the projection lens but is ineffective, based on a control signal from the lamp ECU36, among the plurality of movable reflecting surfaces 17a arranged in a grid pattern, thereby forming a light image composed of a composition of lit portions. The swivel controller 42 pivots the motor drive shaft 7a about the center axis L1 via the swivel driver 44 based on a control signal of the lamp ECU 26, and tilts the DMD lamp unit 4 in fig. 2 (a) (the DMD lamp unit 26 in the modification of fig. 3 (a)) to the left and right.
The slide controller 41 in fig. 4 drives the motor 20a of the vertical slide mechanism 20 and the motor 21a of the horizontal slide mechanism 21 shown in fig. 2 (a) and (b) based on the control signal of the lamp ECU36, slides the spatial light modulator 17, and moves the center 17b in an oblique direction, i.e., upward or downward, leftward or rightward, with respect to the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c).
In the modification shown in fig. 3 (a) and (b), the slide controller 41 in fig. 4 drives the motor 32a of the vertical slide mechanism 32 and the motor 33a of the horizontal slide mechanism 33 based on the control signal of the lamp ECU36 to slide the first to third lenses (16 a to 16 c) and move the center 29b of the spatial light modulator 29 in the direction inclined above or below, to the left or right, and to the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c).
The light sensor 45, the steering operation detection mechanism 46, the turn signal switch 47, the image processing device 48, the manual switch 51, and the like are connected to the lamp ECU36 shown in fig. 4. The image processing device 48 is connected to a road monitoring camera 50 and the like via a communication line such as an in-vehicle camera 49 and the internet.
The optical sensor 45 is a sensor that detects the intensity of light applied from the outside of the vehicle lamp 1 (in the modification, the vehicle lamp 25), the steering operation detection mechanism 46 and the turn signal switch 47 are used to detect the turning direction (left or right) of the vehicle on which the vehicle lamp 1 (in the modification, 25) of the present embodiment is mounted, the image processing device 48 is a device that detects a pedestrian, an oncoming vehicle, or the like on the road from the images taken by the vehicle-mounted camera 49 and the road monitoring camera 50, and the manual switch 51 is an operation unit that changes the positional relationship between the center 17b (in the modification, the center 29 b) of the spatial light modulator 17 and the rear focal point P1 (in the modification, P2) of the first to third lenses (16 a to 16 c) by a button operation or the like.
Next, an irradiation range of the variable light distribution pattern or the road surface drawing display of the DMD lamp unit 4 of the vehicle lamp 1 of the present embodiment will be described with reference to fig. 4 to 7. The upper diagrams of fig. 5 and 6 are diagrams assuming that the spatial light modulator 17 and the like are viewed from the rear of the DMD lamp unit 4. In the upper diagrams of each of fig. 5 and 6, the positional relationship of the center of the spatial light modulator with respect to the rear focal point of the lens is shown, and in the lower diagrams of each of fig. 5 and 6, the range of the two-dot chain line shown by the symbol Lh shows the light distribution pattern for low beam by the low-beam lamp unit 5 of fig. 1, and the symbol Dh shows the irradiation range of light by the DMD lamp unit 4.
The lower diagram in fig. 5 (a) shows the light irradiation range and the low beam light distribution pattern of the conventional DMD lamp unit at the center of the spatial light modulator 17. Conventionally, as shown in the upper view of fig. 5 (a), the center 17b of the spatial light modulator 17 is arranged so as to coincide with the back focal point P1 on the optical axis L0 of the projection lens. As a result, as shown in the lower diagram of fig. 5 (a), the upper half range indicated by the symbol Dh1 in the light irradiation range Dh of the DMD lamp unit is used for displaying the variable light distribution pattern, and the lower half range indicated by the symbol Dh2 is used for displaying the road surface drawing. However, in this case, the irradiation range of the DMD lamp unit can be used only half of the variable light distribution pattern display and the road surface drawing display, and there is a problem that the irradiation range is narrowed.
The variable type light distribution pattern is a headlight display whose shape changes depending on the shape of a road surface, a pedestrian, the presence or absence of an oncoming vehicle, and the like, and the road surface drawing display is a display of a predetermined shape of a figure, a character, and the like, which is irradiated with light on the road surface of the road in the traveling direction, or the like, in order to inform a driver of the oncoming vehicle, the pedestrian, and the like in the traveling direction of the vehicle (not shown) on which the vehicle lamp is mounted, of the fact that the vehicle is approaching, and the traveling direction of the vehicle.
Therefore, in the vehicle lamp 1 (or 25) according to the present embodiment, the light is irradiated by the DMD lamp unit based on the "variable light distribution pattern display pattern" in fig. 5 (b) and the "road surface drawing display pattern" in fig. 5 (c).
When light is irradiated in the "variable light distribution pattern display mode" by the DMD lamp unit 4 of (a) and (b) of fig. 2 (in the modification of (a) of fig. 3, the DMD lamp unit 26), the lamp ECU of fig. 4 drives the motor 20a of the vertical slide mechanism 20 of (a) and (b) of fig. 2 via the slide controller 41, slides the spatial light modulator 17 downward as shown in the upper view of (b) of fig. 5, and moves the center 17b downward to the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c). In the modification shown in fig. 3 (a) and (b), the slide controller 41 drives the motor 32a of the vertical slide mechanism 32 to slide the projection lens module 31 upward with respect to the spatial light modulator 29, and moves the center 29b of the spatial light modulator 29 downward of the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c) as shown in the upper diagram of fig. 5 (b).
In this case, as shown in the lower diagram of fig. 5 (b), since almost the entire area of the irradiation range Dh of light by the DMD lamp unit 4 is inverted and displayed above the H-H line, the entire area of the hot zone in the central portion of the display range is located above the H-H line, in addition to the display range of the variable light distribution pattern being enlarged, and therefore, there is an advantage that the variable light distribution pattern can be displayed farther than in the related art.
In addition, it is preferable that the vehicle lamp 1 of the present embodiment shown in fig. 2 (a) (or the vehicle lamp 25 of fig. 3 (a)) automatically perform display based on the "variable light distribution pattern display mode" by the DMD lamp unit 4 (or 26) when a predetermined phenomenon is detected. For example, it is preferable that the lamp ECU36 controls the DMD lamp unit 4 (or 26) to automatically perform display in the "variable light distribution pattern display mode" when the light sensor 45 or the image processing device 48 detects that the vehicle (not shown) is traveling at "night", traveling in a dark place such as a tunnel, or the like. Alternatively, it is preferable that the lamp ECU36 performs the display based on the "variable light distribution pattern display mode" even when the "display of the variable light distribution pattern" is performed by manual operation input through the manual switch 51.
When light is irradiated in the "road surface drawing display mode" by the DMD lamp unit 4 of (a) and (b) of fig. 2 (in the modification of fig. 3, the DMD lamp unit 26), the lamp ECU of fig. 4 drives the motor 20a of the vertical sliding mechanism 20 of (a) and (b) of fig. 2 via the slide controller 41, and slides the spatial light modulator 17 upward as shown in the upper view of (c) of fig. 5, thereby moving the center 17b upward of the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c). In the modification shown in fig. 3 (a) and (b), the slide control unit 41 drives the motor 32a of the vertical slide mechanism 32 to slide the projection lens module 31 downward with respect to the spatial light modulator 29, and moves the center 29b of the spatial light modulator 29 above the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c) as shown in the upper drawing of fig. 5 (c).
In this case, as shown in the lower diagram of fig. 5 (c), since the entire area of the irradiation range Dh of light by the DMD lamp unit 4 is inverted and displayed below the H-H line, the entire area of the hot zone in the central portion of the display range is located below the H-H line in addition to the wide display range of the road surface drawing display, and therefore, there is an advantage that the road surface drawing display can be displayed more brightly farther than in the conventional case.
In addition, the vehicle lamp 1 of the present embodiment shown in fig. 2 (a) (or the vehicle lamp 25 of fig. 3 (a)) preferably performs the display of the "road surface drawing display mode" by the DMD lamp unit 4 (or 26) when a predetermined phenomenon is detected. For example, it is preferable that the lamp ECU36 controls the DMD lamp unit 4 (or 26) to automatically perform the display of the "road surface drawing display mode" when the light sensor 45 and the image processing device 48 detect that the vehicle (not shown) is traveling in the "daytime" and the display of the variable light distribution pattern is not required, or when the image processing device 48 detects a pedestrian on the road surface, an oncoming vehicle, or the like. Alternatively, it is preferable that the lamp ECU36 performs the display in the "road surface drawing display mode" even when the "road surface drawing display" is performed by manually performing an operation input through the manual switch 51.
In the vehicle lamp 1 of the present embodiment shown in fig. 2 (a) (or the vehicle lamp 25 in fig. 3 (a)), it is preferable that the irradiation in either the "left turn mode" or the "right turn mode" can be performed in either the "variable light distribution pattern display mode" shown in fig. 5 (b) or the "road surface drawing display mode" shown in fig. 5 (c) based on the irradiation of the DMD lamp unit.
The "left turn mode" is a mode in which the irradiation range of light of the DMD lamp unit is brought closer to the left side of the line V-V indicating the predetermined vertical direction as shown in fig. 6 (a), and the "right turn mode" is a mode in which the irradiation range of light of the DMD lamp unit is brought closer to the right side of the line V-V indicating the predetermined vertical direction as shown in fig. 6 (b).
For example, when the DMD lamp unit 4 (in the modification of fig. 3, the DMD lamp unit 26) in (a) and (b) of fig. 2 irradiates light in the "variable light distribution pattern display mode and the left turn mode", the lamp ECU36 of fig. 4 drives the motor 20a of the up-down sliding mechanism 20 and the motor 21a of the left-right sliding mechanism 21 in (a) and (b) of fig. 2 via the slide controller 41, slides the spatial light modulator 17 downward and rightward or obliquely downward to the right as shown in the upper view of (a) of fig. 6, and moves the center 17b obliquely downward to the right of the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c). In the modification shown in fig. 3 (a) and (b), the slide control unit 41 drives the motor 32a of the vertical slide mechanism 32 to slide the projection lens module 31 obliquely upward to the left with respect to the spatial light modulator 29, and moves the center 29b of the spatial light modulator 29 obliquely downward to the right of the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c), as shown in the upper view of fig. 6 (a).
In this case, as shown in the lower diagram of fig. 6 (a), since almost the entire region of the light irradiation range Dh of the DMD lamp unit 4 is inverted and displayed in a region on the left side of the V-V line, the display range of the variable light distribution pattern is widened in the left direction, and the turning direction range can be illuminated more largely when the vehicle turns left or the like.
In the DMD lamp unit 4 (or 26) that performs illumination in the "variable light distribution pattern display mode", illumination in the "variable light distribution pattern display mode and the right turn mode" described later can be performed by setting the sliding direction of the spatial light modulator 17 by the left-right sliding mechanism 21 to the left or setting the sliding direction of the first to third lenses (31 a to 31 c) by the left-right sliding mechanism 33 to the left.
When the DMD lamp unit 4 (in the modification of fig. 3, the DMD lamp unit 26) of (a) and (b) of fig. 2 irradiates light in the "road surface drawing display mode and the right turn mode", the lamp ECU36 of fig. 4 drives the motor 20a of the up-down sliding mechanism 20 and the motor 21a of the left-right sliding mechanism 21 of (a) and (b) of fig. 2 via the slide controller 41, and slides the spatial light modulator 17 upward and leftward or obliquely upward and moves the center 17b obliquely upward and leftward of the rear focal point P1 (optical axis L0) of the first to third lenses (16 a to 16 c) as shown in the upper view of (b) of fig. 6. In the modification shown in fig. 3 (a) and (b), the slide control unit 41 drives the motor 32a of the vertical slide mechanism 32 to slide the projection lens module 31 obliquely downward to the right with respect to the spatial light modulator 29, and moves the center 29b of the spatial light modulator 29 obliquely upward to the left of the rear focal point P2 (optical axis L0') of the first to third lenses (31 a to 31 c) as shown in the upper view of fig. 6 (b).
In this case, as shown in the lower diagram of fig. 6 (b), almost the entire region of the light irradiation range Dh of the DMD lamp unit 4 is reversed to be displayed in a wide range in the region on the right side of the V-V line, and therefore, there are the following advantages: by widening the display range of the road surface drawing display in the right direction, it is possible to display the road surface drawing in a predetermined shape on a road surface farther away in a wider range in the turning direction, for example, when the vehicle turns right.
In addition, the vehicle lamp 1 of the present embodiment shown in fig. 2 (a) (or the vehicle lamp 25 of fig. 3 (a)) preferably performs a display in which the "left turn mode" and the "right turn mode" are combined with any one of the "variable light distribution pattern display mode" and the "road surface drawing display mode" by the DMD lamp unit 4 (or 26) when a predetermined phenomenon is detected. For example, when the turn operation detection means 46 detects a left turn or a right turn of the vehicle (not shown) or detects an input of a left turn or a right turn in the winker switch 47, the lamp ECU36 in fig. 4 preferably controls the DMD lamp unit 4 (or 26) based on the detection result of the left turn or the right turn, and automatically performs a display combining either the "variable light distribution pattern display mode" or the "road surface drawing display mode" with the "left turn mode" or the "right turn mode". Alternatively, preferably, when the manual switch 51 is manually operated to perform the input operation to perform the display of either the "left turn mode" or the "right turn mode", the lamp ECU36 also performs the display.
The irradiation range of light to be independently irradiated by the pair of right and left DMD lamp units (4, 4') will be described with reference to fig. 7 (a) and 7 (b). Fig. 7 (a) shows a vehicle lamp 1 as a left headlamp in which the DMD lamp unit 4 and the low-beam lamp unit 5 are mounted, and a vehicle lamp 1' as a right headlamp in which the DMD lamp unit 4' and the low-beam lamp unit 5' are mounted. The DMD lamp unit 4' has the same structure as the DMD lamp unit 4. The DMD lamp units (4, 4') on the left and right sides can change the positional relationship between the center of the spatial light modulator and the rear focal point common to the first lens to the third lens, respectively and independently. The left and right low-beam lamp units (5, 5') display the synthesized low-beam light distribution pattern Lh.
For example, as shown in the upper diagram of fig. 7 (b), when the center 17b of the spatial light modulator 17 in the DMD lamp unit 4 on the left is shifted upward from the common rear focal point P1 of the first lens to the third lens and the center 17b 'of the spatial light modulator 17' in the DMD lamp unit 4 'on the right is shifted downward from the common rear focal point P1' of the first lens to the third lens, as shown in the lower diagram of fig. 7 (b), the irradiation range Dh of light by the DMD lamp unit 4 is displayed at a position above the H-H line and the irradiation range Dh 'of light by the DMD lamp unit 4' is displayed at a position below the H-H line.
Since the right and left DMD lamp units (4, 4 ') have independent irradiation ranges (Dh, dh '), as shown in the lower diagram of fig. 7 (b), one DMD lamp unit 4 can be caused to perform a road surface drawing display, and the other DMD lamp unit 4' can be caused to perform a variable light distribution pattern display. Thus, the following advantages are provided: both the road surface drawing display (symbol Dh) and the variable light distribution pattern display (symbol Dh') are simultaneously illuminated over a wide range and at a distance.
The irradiation ranges (Dh, dh ') shown in the lower graph of fig. 7 (b) may be displayed repeatedly, and the illumination intensity may be increased by displaying the variable light distribution pattern from both the irradiation ranges (Dh, dh'), or by displaying the road surface drawing from both the irradiation ranges. Further, the irradiation ranges (Dh, dh') may be both rotated in either the left or right direction based on the detection result of either the left or right turn of the vehicle or the operation of the manual switch. In addition, in the case where the irradiation ranges (Dh, dh ') are detected as the left turn (or right turn) of the vehicle to which the variable light distribution pattern is to be irradiated and a pedestrian or the like to which a warning or the like based on the road surface drawing display is to be displayed is detected as the right (or left) or the like who wants to perform the variable light distribution pattern and the road surface drawing display in the right or left direction, respectively, the irradiation ranges (Dh, dh') may be rotated in one direction in the left direction and rotated in the other direction in the right direction based on the detection result.
In the vertical slide mechanisms (20, 32) and the horizontal slide mechanisms (21, 33) shown in fig. 2 (b) and 3 (b), rack and pinion systems other than the ball screw mechanism may be employed.

Claims (8)

1. A lamp for a vehicle, characterized in that,
the vehicular lamp has a lamp unit for a vehicle,
the lamp unit includes: a light source; a projection lens; and a spatial light modulator which has a plurality of reflecting elements and reflects light of the light source toward the projection lens, the plurality of reflecting elements each having a reflecting surface which is tiltable,
at least one of the spatial light modulator and the projection lens is formed such that a center of the spatial light modulator can be displaced to be located at either one of above and below a rear focal point of the projection lens,
when the lamp unit irradiates light in a variable light distribution pattern display mode, the center of the spatial light modulator is displaced so as to be located below the rear focal point of the projection lens, so that the display range of the variable light distribution pattern is enlarged and the variable light distribution pattern is displayed farther, and
in the case where the lamp unit performs irradiation of light in the road surface depiction display mode, the center of the spatial light modulator is displaced so as to be located above the rear focal point of the projection lens, so that the display range of the road surface depiction display is widened and displayed more brightly farther.
2. A lamp for a vehicle as defined in claim 1,
at least one of the spatial light modulator and the projection lens is formed such that a center of the spatial light modulator is displaceable from a vertical direction of a rear focal point of the projection lens to be positioned on either one of a left side and a right side.
3. The vehicular lamp according to claim 1 or 2,
the vehicular lamp is provided with a plurality of lamp units, and is formed so as to be able to independently displace at least one of the spatial light modulator and the projection lens of each lamp unit for each lamp unit.
4. A lamp for a vehicle as claimed in claim 1 or 2,
the vehicle lamp is formed such that at least one of the spatial light modulator and the projection lens can be automatically moved according to a driving condition of a vehicle.
5. The vehicular lamp according to claim 1 or 2,
the vehicle lamp is formed such that at least one of the spatial light modulator and the projection lens is manually movable.
6. The lamp for a vehicle as set forth in claim 1,
the projection lens has: a first lens which is biconvex; a second lens which is biconcave; and a third lens which becomes a plano-convex lens,
the first lens, the second lens, and the third lens are arranged in this order from the rear to the front with a space therebetween.
7. The lamp for a vehicle as set forth in claim 1,
the projector further includes a rotating bracket, and the light source, the spatial light modulator, and the projection lens are mounted on the rotating bracket.
8. A lamp for a vehicle as recited in claim 7,
further comprises a reflector attached to an inner wall of the attachment hole of the rotating bracket,
emergent light generated by the light source is reflected by the reflector to the whole area of the spatial light modulator.
CN202010467470.4A 2019-05-29 2020-05-28 Vehicle lamp Active CN112013350B (en)

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