CN212657653U - Vehicle lamp - Google Patents
Vehicle lamp Download PDFInfo
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- CN212657653U CN212657653U CN202021331819.3U CN202021331819U CN212657653U CN 212657653 U CN212657653 U CN 212657653U CN 202021331819 U CN202021331819 U CN 202021331819U CN 212657653 U CN212657653 U CN 212657653U
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- China
- Prior art keywords
- light
- distribution pattern
- light distribution
- pattern forming
- emitted
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Classifications
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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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
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- 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
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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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
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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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/255—Lenses with a front view of circular or truncated circular outline
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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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
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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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/36—Combinations of two or more separate reflectors
- F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
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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
- F21S41/50—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
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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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The utility model provides a vehicle lamp, it can change the grading pattern of the light of outgoing to can improve energy efficiency. A vehicle lamp (1) is provided with: a light source (30); a light distribution pattern forming unit that reflects incident light and emits light (L1B) having a predetermined light distribution pattern (PT1), and that is capable of changing the predetermined light distribution pattern (PT 1); a reflector (40) that guides a part of the light emitted from the light source (30) to the light distribution pattern forming unit (50); and a reflector unit (60) that reflects another part of the light emitted from the light source (30) into a specific light distribution pattern.
Description
Technical Field
The utility model relates to a lamp for vehicle.
Background
As a vehicle lamp, a vehicle headlamp typified by an automobile headlamp, a drawing device for drawing an image on a road surface or the like, and the like are known. In addition, various configurations have been studied for a vehicle lamp so that a light distribution pattern of emitted light is a predetermined light distribution pattern. For example, patent document 1 listed below discloses a vehicle lamp that forms a predetermined light distribution pattern using a DMD (Digital micromirror Device), which is a Device that reflects light.
The vehicle lamp described in patent document 1 includes a light source, a DMD, a reflector, and a housing. The light source, the DMD, and the reflector are surrounded by the housing, and light emitted from the light source is guided to the DMD by the reflector. The DMD has a reflection control surface composed of reflection surfaces of a plurality of reflection elements that can be independently switched to an inclined state, and reflects light by the reflection control surface to form a light distribution pattern corresponding to the inclined state of the plurality of reflection elements. Therefore, the vehicle lamp of patent document 1 described below can change the light distribution pattern of the emitted light by controlling the inclination state of the plurality of reflection elements in the DMD.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-56746
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved by the utility model
Generally, the light emitted from the light source will diverge. Therefore, even if a reflector for guiding the light emitted from the light source to the DMD is provided as in the vehicle lamp described in patent document 1, a part of the light emitted from the light source may not enter the reflector and may not be guided to the DMD. The light not incident on the reflector is not guided to the DMD but is absorbed by, for example, a housing surrounding the light source, the DMD, and the like. Therefore, there is a need to improve energy efficiency because part of the light emitted from the light source is not emitted from the vehicle lamp.
Therefore, an object of the present invention is to provide a vehicle lamp that can change a light distribution pattern of emitted light and improve energy efficiency.
Means for solving the problems
In order to achieve the above object, the present invention provides a lamp for a vehicle, comprising: a light source; a light distribution pattern forming portion that reflects incident light and emits light having a predetermined light distribution pattern, and that is capable of changing the predetermined light distribution pattern; a light guide member that guides a part of light emitted from the light source to the light distribution pattern forming portion; and a reflector unit that reflects another part of the light emitted from the light source into a specific light distribution pattern.
This lamps and lanterns for vehicle can be to the outgoing outside the car: a light having a predetermined light distribution pattern emitted from the light distribution pattern forming portion; and light having a specific light distribution pattern emitted from the reflector unit. In addition, the light distribution pattern forming portion can change the predetermined light distribution pattern. Therefore, the vehicle lamp can form a desired light distribution pattern by using light including these lights, and can change the light distribution pattern. In this vehicle lamp, a part of the light emitted from the light source is guided by the light guide member to the light distribution pattern forming portion and reflected by the light distribution pattern forming portion, and another part of the light emitted from the light source is reflected by the reflector unit. In other words, the reflector unit reflects light that is not guided to the light distribution pattern forming portion, among light emitted from the light source. Further, the vehicle lamp can form the light distribution pattern by using light including light guided to the light distribution pattern forming portion by the light guide member and light not guided to the light distribution pattern forming portion. Therefore, the vehicle lamp can improve energy efficiency as compared with a case where light emitted from the light source but not incident on the light guide member is generated and a light distribution pattern is formed by light not including the light.
The reflector unit may have: a 1 st reflecting part that reflects the other part of the light emitted from the light source; and a 2 nd reflecting portion that reflects the light reflected by the 1 st reflecting portion into the specific light distribution pattern.
In this vehicle lamp, the reflector unit reflects twice the light incident on the reflector unit among the light emitted from the light source, thereby emitting light of a specific light distribution pattern. Therefore, the vehicle lamp can improve the degree of freedom of the specific light distribution pattern formed by the light emitted from the reflector unit, as compared with the case where the reflector unit reflects the light from the light source only once.
In the case where the reflector unit includes a 1 st reflecting portion and a 2 nd reflecting portion, the 1 st reflecting portion may be located on a side opposite to the light source side with respect to the light distribution pattern forming portion, and the 2 nd reflecting portion may be located on the light distribution pattern forming portion side with respect to the 1 st reflecting portion and on the 1 st reflecting portion side with respect to the light distribution pattern forming portion in a predetermined direction parallel to an emission surface of the light emitted from the light distribution pattern forming portion.
In the case where the reflector unit has the 1 st reflecting portion and the 2 nd reflecting portion, the vehicle lamp may further include a projection lens through which light emitted from the light distribution pattern forming portion and light reflected by the reflector unit pass, and the 2 nd reflecting portion may intersect a reference plane including an emission surface of the light emitted from the light distribution pattern forming portion.
With such a configuration, the size of the predetermined light distribution pattern of the light emitted from the light distribution pattern forming portion and the size of the specific light distribution pattern of the light emitted from the reflector unit can be easily set to desired sizes, as compared with the case where the projection lens is not provided. In addition, as compared with a case where the 2 nd reflecting portion does not intersect the reference plane including the emission surface of the light distribution pattern forming portion, the displacement of the light distribution pattern forming portion and the 2 nd reflecting portion in the direction from the light distribution pattern forming portion toward the projection lens can be reduced. Therefore, compared with the above case, the following can be suppressed: a part of the light having the predetermined light distribution pattern from the light distribution pattern forming part toward the projection lens is covered by the 2 nd reflecting part; part of the light having the specific light distribution pattern directed from the 2 nd reflecting portion toward the projection lens is blocked by the light distribution pattern forming portion.
The vehicle lamp may further include a projection lens through which the light emitted from the light distribution pattern forming portion and the light reflected by the reflector unit pass, and a 1 st incident region of an incident surface of the projection lens, into which the light emitted from the light distribution pattern forming portion enters, and a 2 nd incident region of an incident surface of the projection lens, into which the light reflected by the reflector unit enters, may not overlap with each other.
Since the light emitted from the light distribution pattern forming portion and the light reflected by the reflector unit are emitted from different positions, the incident angles of these lights to the projection lens are different. Therefore, in the case where these lights are incident on the same region of the incident surface of the projection lens, the design of the incident surface of the region tends to become difficult. However, in the vehicle lamp, since these lights are incident on different regions of the incident surface of the projection lens, the projection lens can be easily designed.
The vehicle lamp may further include a projection lens through which light emitted from the light distribution pattern forming portion and light reflected by the reflector unit pass, and the light guide member may be a reflector having a reflection surface and may traverse an entire region between the projection lens and the light source.
With such a configuration, it is possible to suppress light emitted from the light source from directly entering the projection lens, and to suppress unwanted light from being emitted.
Effect of the utility model
As described above, according to the present invention, it is possible to provide a vehicle lamp capable of changing the light distribution pattern of the emitted light and improving the energy efficiency.
Drawings
Fig. 1 is a front view schematically showing a vehicle including a vehicle lamp according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of 1 lamp along line II-II of fig. 1 in the vertical direction.
Fig. 3 is a front view schematically showing a projection lens.
Fig. 4 is a diagram illustrating a light distribution pattern of high beam.
Description of the symbols
1 … … vehicle lamp
1a, 1b … … luminaire
30 … … light source
40 … … Reflector (light guide)
50 … … light distribution pattern forming part
60 … … reflector unit
61 … … No. 1 reflective part
62 … … No. 2 reflective part
70 … … projection lens
70a … … optical axis
Reference plane of RP1 … …
Detailed Description
The following illustrates a mode for implementing the vehicle lamp according to the present invention and drawings. The following illustrative embodiments are provided to facilitate understanding of the present invention and are not intended to be construed as limiting the present invention. The present invention can be modified and improved based on the following embodiments without departing from the gist thereof.
Fig. 1 is a front view schematically showing a vehicle including a vehicle lamp according to an embodiment of the present invention. The vehicle lamp 1 of the present embodiment is a headlamp for an automobile. As shown in fig. 1, a vehicle 100 includes a pair of vehicle lamps 1 in each of the front left and right directions. The pair of vehicle lamps 1 included in the vehicle 100 are symmetrical in the left-right direction. In the vehicle lamp 1 of the present embodiment, the plurality of lamps 1a and 1b are arranged in the lateral direction, the lamp 1a is disposed at a position outside the vehicle 100 with respect to the lamp 1b, and the lamp 1b is disposed at a position on the center side of the vehicle 100 with respect to the lamp 1 a. As described below, the vehicle lamp 1 according to the present embodiment is configured to emit high beam by emitting light from the lamps 1a and 1 b. The structure of the lamp 1b is not particularly limited. For example, the lamp 1b may be a parabolic lamp, a projection lamp, a direct lens lamp, or the like. The order of arrangement of the lamps 1a and 1b is not particularly limited.
Fig. 2 is a cross-sectional view taken along line II-II in fig. 1, and schematically shows a cross-section of the lamp 1a in the vertical direction. As shown in fig. 2, a lamp 1a, which is a part of the vehicle lamp 1, includes a housing 10 and a lamp unit 20 as main components. In the present embodiment, the lamp unit 20 is a lamp unit that emits a part of the high beam.
The housing 10 includes a lamp cover 11, a front cover 12, and a rear cover 13 as main components. The front opening of the lamp housing 11 is closed by a front cover 12 fixed to the lamp housing 11. Further, an opening smaller than the front is formed in the rear of the globe 11, and a rear cover 13 is fixed to the globe 11 to close the opening.
A space formed by the globe 11, the front cover 12 that closes the front opening of the globe 11, and the rear cover 13 that closes the rear opening of the globe 11 is a lamp chamber R in which the lamp unit 20 is housed.
The lamp unit 20 of the present embodiment includes a light source 30, a reflector 40 as a light guide member, a light distribution pattern forming portion 50, a reflector unit 60, a projection lens 70, and a light absorbing member 80 as main components, and is fixed to the housing 10 by a structure not shown.
The Light source 30 is a Light emitting element that emits Light, and in the present embodiment, is a surface mount LED (Light emitting diode) that has a substantially rectangular emission surface and emits white divergent Light. The light source 30 is mounted on the circuit board 31, and is disposed such that an emission surface of emitted light faces forward and upward. The number and type of the light sources 30 are not particularly limited, and the light sources 30 may be laser elements that emit laser light, for example.
The reflector 40 as a light guide member guides a part of light emitted from the light source 30 to a light distribution pattern forming portion 50 described later, and is configured to reflect a part of light emitted from the light source 30 toward the light distribution pattern forming portion 50 by a reflection surface 40 r. In addition, another part of the light emitted from the light source 30 does not enter the reflector 40.
The reflector 40 of the present embodiment is a curved plate-like member, and is arranged to cover the light source 30 from the front side. The surface of the reflector 40 on the light source 30 side is a reflection surface 40r that reflects light emitted from the light source 30. The reflecting surface 40r is curved so as to be recessed toward the opposite side to the light source 30 side, and is configured to converge light emitted from the light source 30 and irradiate the light distribution pattern forming portion 50 with the elliptic surface of revolution as a reference, for example.
The light distribution pattern forming unit 50 is configured to reflect incident light and emit light having a predetermined light distribution pattern, and the predetermined light distribution pattern can be changed. The light distribution pattern forming portion 50 of the present embodiment is a so-called DMD, and includes a reflection portion 51, an edge cover 52, and a protective cover 53 as main components. In fig. 2, the interior of the reflection unit 51 is not shown. The reflection unit 51 has a reflection control surface 51S that reflects incident light, and is configured to form a predetermined light distribution pattern using light reflected by the reflection control surface 51S. In the present embodiment, the reflection unit 51 is formed in a substantially rectangular shape in front view, and the entire area in front view is the reflection control surface 51S. The edge cover 52 covers the entire periphery of the side surface of the reflection unit 51 and the side opposite to the reflection control surface 51S. The protective cover 53 is a plate-like member having light transmittance, and is fixed to the edge cover 52 so as to cover the reflection control surface 51S.
The light distribution pattern forming portion 50 is arranged to irradiate the reflection control surface 51S with light emitted from the light source 30 and reflected by the reflector 40 via the protective cover 53. In the present embodiment, the light distribution pattern forming portion 50 is positioned on the rear side and the upper side of the light source 30, and the surface 53S of the protective cover 53 is arranged to extend substantially in the vertical direction and the left-right direction. The light reflected by the reflection control surface 51S is emitted from the light distribution pattern forming portion 50 through the protective cover 53. Therefore, the surface 53S of the protective cover 53 opposite to the reflection control surface 51S is the incident surface and the emission surface of the light distribution pattern forming portion 50. The edge cover 52 is not particularly limited, and may not cover the back side of the reflection portion 51, for example. The light distribution pattern forming unit 50 may not include the edge cover 52 and the protective cover 53.
The reflection unit 51 includes a plurality of reflection elements arranged two-dimensionally, not shown, and the reflection control surface 51S of the reflection unit 51 is constituted by reflection surfaces of the plurality of reflection elements. The plurality of reflecting elements are supported by a substrate, not shown, so as to be independently tiltable. The plurality of reflecting elements can be respectively and independently switched into a 1 st dumping state dumping to one side at a preset angle and a 2 nd dumping state dumping to the other side at a preset angle. A reflection unit drive circuit, not shown, is connected to the reflection unit 51, and the tilt state of each reflection element is switched according to a voltage applied to each reflection element by the reflection unit drive circuit. Therefore, each of the reflecting elements reflects the incident light toward a predetermined direction or another predetermined direction according to the tilted state. When the plurality of reflection elements are in the tilted state, and the reflection surfaces of the plurality of reflection elements are positioned on the same plane, the reflection control surface 51S is substantially parallel to the surface 53S of the protective cover 53.
Such a light distribution pattern forming unit 50 can form a predetermined light distribution pattern by light emitted from the reflection control surface 51S in a predetermined direction by controlling the tilt state of the plurality of reflection elements of the reflection unit 51, and can change the light distribution pattern. Further, the light distribution pattern forming unit 50 can control the tilt state of the reflector over time, thereby making the intensity distribution of light in a predetermined light distribution pattern a predetermined intensity distribution. Most of the light reflected by the reflection control surface 51S in another predetermined direction different from the predetermined direction is converted into heat by the light absorbing member 80 described later.
The reflector unit 60 reflects at least a part of the light emitted from the light source 30, which is not incident on the reflector 40 as the light guide member and is not guided to the light distribution pattern forming portion 50, so as to form a specific light distribution pattern. Therefore, a part of the light emitted from the light source 30 is reflected by the reflector 40, enters the light distribution pattern forming portion 50, and is reflected by the light distribution pattern forming portion 50. Another part of the light emitted from the light source 30 enters the reflector unit 60 and is reflected by the reflector unit 60. In the present embodiment, the reflector unit 60 includes the 1 st reflecting portion 61 and the 2 nd reflecting portion 62. In the reflector unit 60, at least a part of the light emitted from the light source 30 but not reflected by the reflector 40 is reflected toward the 2 nd reflecting part 62 by the 1 st reflecting part 61. In the reflector unit 60, the 2 nd reflection unit 62 reflects the light reflected by the 1 st reflection unit 61 into a specific light distribution pattern. In other words, the reflector unit 60 reflects twice the light emitted from the light source 30 and not reflected by the reflector 40, thereby emitting light of a specific light distribution pattern. In addition, the 1 st reflecting part 61 guides the light to the 2 nd reflecting part 62. In the present embodiment, light emitted from the reflection control surface 51S of the light distribution pattern forming portion 50 in another predetermined direction different from the predetermined direction enters the 1 st reflection portion 61, and the 1 st reflection portion 61 reflects the light toward the light absorbing member 80 described later.
The 1 st reflecting portion 61 of the present embodiment is a curved plate-like member extending in the front-rear direction and the left-right direction. The 1 st reflecting portion 61 is disposed forward and above the light distribution pattern forming portion 50. Therefore, it can be understood that the 1 st reflecting portion 61 is located on the opposite side of the light distribution pattern forming portion 50 from the light source 30 side in the vertical direction parallel to the surface 53S which is the emission surface of the light emitted from the light distribution pattern forming portion 50. The surface of the 1 st reflecting part 61 on the light source 30 side is a reflecting surface 61r that reflects light emitted from the light source 30 and not reflected by the reflector 40, and the reflecting surface 61r and the light source 30 overlap each other in the vertical direction.
The 2 nd reflecting part 62 of the present embodiment is a curved plate-like member extending in the vertical direction and the lateral direction. The 2 nd reflection part 62 is spaced apart from the 1 st reflection part 61, and is disposed below the 1 st reflection part 61 and above the light distribution pattern forming part 50. Therefore, it can be understood that the 2 nd reflecting portion 62 is located closer to the light distribution pattern forming portion 50 than the 1 st reflecting portion 61 and closer to the 1 st reflecting portion 61 than the light distribution pattern forming portion 50 in the vertical direction parallel to the surface 53S which is the emission surface of the light emitted from the light distribution pattern forming portion 50. The 2 nd reflecting portion 62 intersects a reference plane RP1 including the surface 53S of the protective cover 53 of the light distribution pattern forming portion 50. Further, the reference surface RP1 is a plane. The surface on the front side of the 2 nd reflecting portion 62 is a reflecting surface 62r that reflects the light reflected by the reflecting surface 61r of the 1 st reflecting portion 61. Further, the 2 nd reflecting portion 62 may be connected to the 1 st reflecting portion 61, the 1 st reflecting portion 61 may be formed integrally with the 2 nd reflecting portion 62, or the reflecting surface 61r may be connected to the reflecting surface 62 r.
The reflection surface 61r of the 1 st reflection part 61 is curved in a shape recessed toward the side opposite to the light source 30 side. The reflecting surface 61r reflects at least a part of the light emitted from the light source 30 and not reflected by the reflector 40 to converge the light toward the reflecting surface 62r of the 2 nd reflecting portion 62. Specifically, the reflecting surface 61r is a curved surface based on a surface of a revolution ellipse having one focal point overlapping the light source 30 and the other focal point overlapping the reflecting surface 62r of the 2 nd reflecting part 62, and includes at least a part of the surface of the revolution ellipse. The focal point of the surface of revolution elliptic curve coinciding with the reflecting surface 62r is located at or near the center of the reflecting surface 62 r. On the other hand, the reflecting surface 62r of the 2 nd reflecting portion 62 is curved in a shape recessed to the rear side in the left-right direction to reflect the light reflected by the 1 st reflecting portion 61 toward the front side to form a specific light distribution pattern. Thus, light having a specific light distribution pattern is emitted from the reflector unit 60. In the present embodiment, the reflection surface 61r of the 1 st reflection part 61 reflects light emitted from the reflection control surface 51S of the light distribution pattern forming part 50 in another predetermined direction different from the predetermined direction toward the light absorbing member 80 described later. In other words, the arrangement of the 1 st reflecting portion 61 and the light distribution pattern forming portion 50 and the shape of the reflecting surface 61r are adjusted so that the light is reflected by the reflecting surface 61r toward the light absorbing member 80. The reflection surface 61r of the 1 st reflection part 61 may be flat, for example, as long as it reflects at least a part of the light emitted from the light source 30 and not reflected by the reflector 40 toward the reflection surface 62r of the 2 nd reflection part 62. The reflection surface 62r of the 2 nd reflection unit 62 may be a flat surface, for example, as long as it reflects the light reflected by the 1 st reflection unit 61 into a specific light distribution pattern.
The projection lens 70 is a lens that adjusts the divergence angle of incident light. The projection lens 70 is disposed in front of the light distribution pattern forming unit 50 and the 2 nd reflecting unit 62. The light having a predetermined light distribution pattern emitted from the light distribution pattern forming portion 50 and the light having a specific light distribution pattern emitted from the reflector unit 60 are incident on the projection lens 70, and the divergence angle of these lights is adjusted by the projection lens 70. Then, the light whose divergence angle is adjusted by the projection lens 70 exits the lamp 1a via the front cover 12. In the present embodiment, the projection lens 70 is a lens in which the incident surface 70i and the emission surface 70o are formed in a convex shape. The optical axis 70a of the projection lens 70 passes through the center of or near the reflection control surface 51S of the light distribution pattern forming unit 50, and the rear focal point of the projection lens 70 is located on or near the reflection control surface 51S. The optical axis 70a of the projection lens 70 is substantially perpendicular to the reflection control surface 51S. With the optical axis 70a of the projection lens 70 as a reference, the 1 st reflecting portion 61 of the reflector unit 60 is located on the opposite side of the optical axis 70a from the light source 30 side in the vertical direction parallel to the surface 53S as the emission surface of the light emitted from the light distribution pattern forming portion 50. The 2 nd reflecting part 62 is located closer to the optical axis 70a than the 1 st reflecting part 61 and closer to the 1 st reflecting part 61 than the optical axis 70 a. In addition, the reflector 40 as a light guide member traverses the entire region between the projection lens 70 and the light source 30. Note that the upper and lower portions of the projection lens 70 may be cut off.
Fig. 3 is a front view schematically showing the projection lens 70, and is a view of the projection lens 70 as viewed from the incident surface 70i side. As shown in fig. 3, the incident surface 70i includes a 1 st region 70ia and a 2 nd region 70 ib. In fig. 3, the 2 nd region 70ib is etched. The 1 st region 70ia is located on the upper side of the 2 nd region 70 ib. In other words, the 1 st region 70ia is located on the opposite side of the light source 30 side from the 2 nd region 70 ib. The 2 nd region 70ib is provided with a plurality of diverging elements, not shown, that diverge light. Examples of the diverging element include a projection and a recess. The width of such diverging elements is preferably approximately 1mm, both up and down and left and right. In addition, where the diverging elements are protrusions, the height of the diverging elements is preferably substantially less than 10 μm. In addition, where the diverging elements are concave, the depth of the diverging elements is preferably substantially less than 10 μm. In addition, the distance between adjacent diverging elements is preferably approximately 1 mm. Then, the light having the predetermined light distribution pattern emitted from the light distribution pattern forming portion 50 enters the 1 st region 70ia, and the light reflected by the reflector unit 60 enters the 2 nd region 70 ib. Therefore, it can be understood that the 1 st incident region into which the light having the predetermined light distribution pattern emitted from the light distribution pattern forming portion 50 is incident and the 2 nd incident region into which the light reflected by the reflector unit 60 is incident do not overlap with each other, and a plurality of divergent elements are provided in the 2 nd incident region. Note that the No. 2 incident region may not be provided with the diverging element. In addition, the 1 st incident region and the 2 nd incident region may overlap each other.
The light absorbing member 80 is a member having light absorption properties, and is configured to convert most of incident light into heat. As shown in fig. 2, in the present embodiment, the light absorbing member 80 is a plate-like member having light absorbing property, and is disposed below the light distribution pattern forming portion 50 and behind the light source 30. Therefore, it can be understood that the light absorbing member 80 is positioned closer to the light source 30 than the light distribution pattern forming portion 50 in the vertical direction parallel to the surface 53S of the light distribution pattern forming portion 50. It can be understood that the light absorbing member 80 is positioned closer to the light distribution pattern forming portion 50 than the light source 30 in the front-rear direction perpendicular to the surface 53S of the light distribution pattern forming portion 50. Further, a part of the light distribution pattern forming portion 50 is located closer to the light source 30 than the light distribution pattern forming portion 50 in the front-rear direction. Then, the light emitted from the reflection control surface 51S of the light distribution pattern forming portion 50 in another predetermined direction different from the predetermined direction and reflected by the reflection surface 61r of the 1 st reflection portion 61 of the reflector unit 60 enters the light absorbing member 80, and most of the light is converted into heat. Examples of the light absorbing member 80 include a plate-like member made of metal such as aluminum and having a surface subjected to black aluminum processing or the like. Further, the light absorbing member 80 may be formed integrally with the lamp cover 11 of the housing 10, forming a part of the lamp cover 11. In addition, in the case where the lamp unit 20 further includes a heat sink on which the light source 30 and the light distribution pattern forming portion 50 are mounted, the light absorbing member 80 may be formed integrally with the heat sink to be a part of the heat sink.
Next, the operation of the vehicle lamp 1 will be described. Specifically, the operation of emitting the high beam will be described.
In the present embodiment, a light distribution pattern of high beam is formed by light emitted from the lamp units 1a and 1b of the vehicle lamp 1. As shown in fig. 2, the lamp 1a emits white light from the light source 30 by supplying power from a power supply not shown. A part of the light emitted from the light source 30 is reflected by the reflection surface 40r of the reflector 40 as the light guide member toward the light distribution pattern forming portion 50. The light L1A reflected by the reflection surface 40r of the reflector 40 is converged and irradiated onto the reflection control surface 51S of the light distribution pattern forming unit 50, and is reflected by the reflection control surface 51S. In the present embodiment, the light L1A is irradiated to the entire surface of the reflection control surface 51S. Light L1B having a predetermined light distribution pattern is emitted from the light distribution pattern forming unit 50 in a predetermined direction, and the light L1B passes through the projection lens 70 and is emitted from the lamp 1a via the front cover 12. Further, most of the light L1C emitted from the reflection control surface 51S toward another predetermined direction different from the predetermined direction is reflected by the reflection surface 61r of the 1 st reflection part 61 of the reflector unit 60, and is incident on the light absorbing member 80 to be converted into heat. Further, at least a part of the light that is not reflected by the reflection surface 40r of the reflector 40, which is another part of the light emitted from the light source 30, is reflected by the reflection surface 61r of the 1 st reflection part 61 of the reflector unit 60 toward the 2 nd reflection part 62. The light L2A reflected by the reflection surface 61r of the 1 st reflection part 61 is reflected by the reflection surface 62r of the 2 nd reflection part 62 to form a specific light distribution pattern. Light L2B having a specific light distribution pattern is emitted from reflector unit 60, and light L2B passes through projection lens 70 and is emitted from lamp 1a via front cover 12.
Fig. 4 is a diagram illustrating a light distribution pattern of high beam. S in fig. 4 shows a horizontal line. As shown in fig. 4, the light distribution pattern PH of the high beam is formed by a plurality of light distribution patterns. Specifically, the light distribution pattern PH of the high beam is formed by the following light distribution patterns: a predetermined light distribution pattern PT1 formed using light L1B, a specific light distribution pattern PT2 formed using light L2B, and a light distribution pattern PT3 formed using light emitted from the lamp 1 b. In fig. 4, the outline of the light distribution pattern PH of the high beam is indicated by a thick line, the outline of the predetermined light distribution pattern PT1 is indicated by a broken line, the outline of the specific light distribution pattern PT2 is indicated by a one-dot chain line, and the outline of the light distribution pattern PT3 is indicated by a two-dot chain line. In addition, the portion of the contour of the predetermined light distribution pattern PT1 and the contour of the light distribution pattern PT3 that overlaps the contour of the light distribution pattern PH of the high beam is shown offset from the contour of the light distribution pattern PH of the high beam.
As shown in fig. 4, the light distribution pattern PH of the high beam is formed by a predetermined light distribution pattern PT1 at the upper middle portion and by a specific light distribution pattern PT2 and a light distribution pattern PT3 at the lower portion. The lower portion of the predetermined light distribution pattern PT1 and the upper portion of the light distribution pattern PT3 overlap each other. In other words, the tilt state of the plurality of reflecting elements of the reflection portion 51 of the light distribution pattern forming portion 50 of the lamp 1a is controlled so as to form the predetermined light distribution pattern PT 1. The entire specific light distribution pattern PT2 overlaps with the light distribution pattern PT 3. The specific light distribution pattern PT2 and the predetermined light distribution pattern PT1 do not overlap with each other. In other words, the reflector unit 60 of the lamp 1a is formed in such a manner that the specific light distribution pattern PT2 is formed.
As described above, the vehicle lamp 1 of the present embodiment emits the light L1B having the predetermined light distribution pattern PT1 and the light L2B having the specific light distribution pattern PT2 from the lamp 1a, and emits the light having the light distribution pattern PT3 from the lamp 1 b. Then, the light distribution pattern PH of the high beam is formed by the lights L1B and L2B, and the high beam is emitted from the vehicle lamp 1. A part of the light distribution pattern PH of the high beam thus emitted is formed by light including the light L1B emitted from the light distribution pattern forming portion 50. Therefore, the light distribution pattern of the region formed by the light including the light L1B in the light distribution pattern PH of the high beam, that is, the region overlapping with the predetermined light distribution pattern PT1 in fig. 4 can be changed. Therefore, for example, the light distribution pattern in this region can be changed according to the situation in front of the vehicle 100, and the high Beam emitted from the vehicle lamp 1 can be made to be ADB (Adaptive Driving Beam). The specific light distribution pattern PT2 may overlap the predetermined light distribution pattern PT 1. At least a part of the specific light distribution pattern PT2 may not overlap the predetermined light distribution pattern PT1 and the light distribution pattern PT3 of the light emitted from the lamp 1 b. In this case, the area irradiated with the light emitted from the vehicle lamp 1 can be enlarged.
As described above, the vehicle lamp of the present embodiment includes the light source 30, the reflector 40 as the light guide member, the light distribution pattern forming portion 50, and the reflector unit 60. The reflector 40 guides a part of the light emitted from the light source 30 to the light distribution pattern forming portion 50. The light distribution pattern forming section 50 reflects the incident light L1A and emits light L1B having a predetermined light distribution pattern PT1, and is capable of changing the predetermined light distribution pattern PT 1. The reflector unit 60 reflects another part of the light emitted from the light source 30 into a specific light distribution pattern PT 2.
The vehicle lamp 1 of the present embodiment can emit light to the outside of the vehicle: light L1B having a predetermined light distribution pattern PT1 emitted from the light distribution pattern forming unit 50; and light L2B having a specific light distribution pattern PT2 emitted from the reflector unit 60. Further, the light distribution pattern forming unit 50 can change the predetermined light distribution pattern PT 1. Therefore, the vehicle lamp 1 according to the present embodiment can form a desired light distribution pattern using light including the light beams L1B and L2B, and can change the light distribution pattern, for example, can emit the ADB as described above. In the vehicle lamp 1 according to the present embodiment, a part of the light emitted from the light source 30 is guided to the light distribution pattern forming portion 50 by the reflector 40 serving as a light guide member, and is reflected by the light distribution pattern forming portion 50. In addition, another part of the light emitted from the light source 30 is reflected by the reflector unit 60. In other words, the reflector unit 60 reflects light that is not guided to the light distribution pattern forming portion 50, among the light emitted from the light source 30. Further, the vehicle lamp 1 of the present embodiment can form a light distribution pattern by using light including light guided to the light distribution pattern forming portion 50 by the reflector 40 and light not guided to the light distribution pattern forming portion 50. Therefore, the vehicle lamp 1 of the present embodiment can improve energy efficiency as compared with a case where light emitted from the light source 30 but not incident on the reflector 40 is generated and a light distribution pattern is formed by light not including the light.
In the vehicle lamp 1 of the present embodiment, the reflector unit 60 has the 1 st reflecting portion 61 and the 2 nd reflecting portion 62. The 1 st reflecting portion 61 reflects at least a part of the light emitted from the light source 30, which is not guided to the light distribution pattern forming portion 50. The 2 nd reflecting portion 62 reflects the light L2A reflected by the 1 st reflecting portion 61 as a specific light distribution pattern. Therefore, the reflector unit 60 of the present embodiment reflects twice the light incident on the reflector unit 60 among the light emitted from the light source 30, and emits the light L2B of the specific light distribution pattern PT 2. Therefore, the vehicle lamp 1 of the present embodiment can improve the degree of freedom of the specific light distribution pattern PT2 formed by the light L2B emitted from the reflector unit 60, as compared with the case where the reflector unit 60 reflects the light from the light source 30 only once.
In the vehicle lamp 1 of the present embodiment, the reflective surface 61r of the 1 st reflective portion 61 is provided as a curved surface including at least a part of a surface of revolution ellipse, one focal point of which coincides with the light source 30 and the other focal point of which coincides with the reflective surface 62r of the 2 nd reflective portion 62. Therefore, compared to the case where the reflection surface 61r of the 1 st reflection part 61 is a plane, the amount of light reflected by the 1 st reflection part 61 and incident on the 2 nd reflection part 62 can be increased, and the amount of light emitted from the reflector unit 60 can be increased.
The vehicle lamp 1 according to the present embodiment further includes a projection lens 70, and the projection lens 70 is transmitted by the light L1B emitted from the light distribution pattern forming portion 50 and the light L2B reflected by the reflector unit 60. Therefore, compared to the case where the projection lens 70 is not provided, the vehicle lamp 1 of the present embodiment makes it easier to set the size of the predetermined light distribution pattern of the light L1B emitted from the light distribution pattern forming portion 50 and the size of the specific light distribution pattern of the light L2B emitted from the reflector unit 60 to desired sizes.
The vehicle lamp 1 of the present embodiment includes the projection lens 70, and the 2 nd reflecting portion 62 intersects the reference plane RP1 including the surface 53S of the protective cover 53 which is the emission surface of the light distribution pattern forming portion 50 that emits the light L1B having the predetermined light distribution pattern. Therefore, the displacement of the light distribution pattern forming portion 50 and the 2 nd reflecting portion 62 in the direction from the light distribution pattern forming portion 50 toward the projection lens 70 can be reduced as compared with the case where the 2 nd reflecting portion 62 does not intersect with the reference plane RP1 of the light distribution pattern forming portion 50. Therefore, compared to the above case, the vehicle lamp 1 of the present embodiment can suppress the following: part of the light L1B having a predetermined light distribution pattern from the light distribution pattern forming unit 50 toward the projection lens 70 is blocked by the 2 nd reflecting unit 62; part of the light L2B having the specific light distribution pattern directed from the 2 nd reflecting portion 62 toward the projection lens 70 is blocked by the light distribution pattern forming portion 50.
In the vehicle lamp 1 of the present embodiment, the 1 st incident region on the incident surface 70i of the projection lens 70, on which the light L1B emitted from the light distribution pattern forming portion 50 is incident, and the 2 nd incident region on which the light L2B reflected by the reflector unit 60 is incident do not overlap with each other. The light L1B emitted from the light distribution pattern forming portion 50 and the light L2B reflected by the reflector unit 60 are emitted from different positions. Therefore, the incident angles of the lights L1B and L2B to the projection lens 70 are different. Therefore, when the lights L1B, L2B are incident on the same region of the incident surface 70i of the projection lens 70, the design of the incident surface 70i in this region tends to be difficult. However, in the vehicle lamp of the present embodiment, since the lights L1B and L2B are incident on different regions of the incident surface 70i of the projection lens 70, the projection lens 70 can be easily designed.
In the vehicle lamp 1 of the present embodiment, a plurality of divergent elements that diverge light are provided in the 2 nd incidence region on the incidence surface 70i of the projection lens 70. Therefore, the contour of the specific light distribution pattern PT2 formed by the light L2B emitted from the reflector unit 60 can be blurred. Therefore, the contour of the specific light distribution pattern PT2 is made less conspicuous, and the driver can be prevented from feeling strangeness. In addition, from the viewpoint of blurring the contour of the specific light distribution pattern PT2, a plurality of diverging elements may be provided in at least one of the 2 nd incident region and the emission region from which the light L2B reflected by the reflector unit 60 and incident on the 2 nd incident region in the emission surface 70o of the projection lens 70 is emitted.
In the vehicle lamp 1 of the present embodiment, the reflector 40 traverses the entire region between the projection lens 70 and the light source 30. Therefore, the vehicle lamp 1 of the present embodiment can suppress the light emitted from the light source 30 from directly entering the projection lens 70, and can suppress the unwanted light from being emitted.
The present invention has been described above by way of examples of the embodiments, but the present invention is not limited to these embodiments.
For example, although the vehicle lamp 1 irradiates a high beam in the above embodiment, the present invention is not particularly limited. For example, the vehicle lamp 1 may irradiate the light constituting the image to the object to be irradiated, such as a road surface, together with the low beam. In this case, for example, the lamp unit 20 in the lamp 1a of the above embodiment is configured to be turned upside down. In other words, the light distribution pattern forming portion 50 is disposed below the light source 30, and the 1 st reflecting portion 61 of the reflector unit 60 is disposed forward and downward of the light distribution pattern forming portion 50. The 2 nd reflection part 62 is disposed above the 1 st reflection part 61 and below the light distribution pattern forming part 50. The shape of the light distribution pattern forming unit 50 toward the projection lens 70 is adjusted so that the light L2B emitted from the light distribution pattern forming unit 50 is irradiated onto the road surface in front of the vehicle. Further, the shapes of the reflection surface 61r of the 1 st reflection unit 61 and the reflection surface 62r of the 2 nd reflection unit 62, the shape of the projection lens 70, and the like are adjusted so that the entire specific light distribution pattern PT2 formed by the light L2B overlaps the light distribution pattern PT3 formed by the light emitted from the lamp 1 b. Thus, a light distribution pattern of low beam is formed by the specific light distribution pattern PT2 and the light distribution pattern PT 3. In other words, at least a part of the light emitted from the light source 30 that is not guided to the light distribution pattern forming portion 50 is used as the low beam. The inclination state of the plurality of reflective elements of the reflection portion 51 of the light distribution pattern forming portion 50 is controlled so that the light L1B emitted from the light distribution pattern forming portion 50 becomes light constituting an image. With this arrangement, light constituting an image can be irradiated onto the road surface together with the low beam. In addition, the image is changed by controlling the tilting state of the reflecting element. In this case, it can be understood that the light distribution pattern of the light emitted from the vehicle lamp 1 is a light distribution pattern formed by the low beam and the light constituting the image. Even if the lamp 1a is configured as described above, the vehicle lamp 1 can improve energy efficiency as compared with the case where light emitted from the light source 30 and not incident on the reflector 40 is generated and a light distribution pattern is formed by light not including the light, as in the above-described embodiment.
In the above embodiment, light L1B emitted from light distribution pattern forming unit 50 and light L2B emitted from reflector unit 60 are emitted from lamp 1a toward the front of vehicle 100. However, the light emitting directions of the lights L1B and L2B from the lamp 1a may be different from each other. For example, light L1A may be emitted from lamp 1a toward the road surface on the side of vehicle 100, and light L1B may be emitted from lamp 1a toward the front of vehicle 100. In addition, when the vehicle lamp 1 can irradiate light constituting an image to an object to be irradiated such as a road surface, the direction of light emitted from the vehicle lamp 1 and the position where the vehicle lamp 1 is mounted on the vehicle are not particularly limited.
In the above embodiment, the light emitted from the lamp 1a and the light emitted from the lamp 1b form a light distribution pattern of high beam. However, the vehicle lamp 1 may form a light distribution pattern of high beam or the like only by the light emitted from the lamp 1 a. The vehicle lamp 1 may further include another lamp different from the lamps 1a and 1b, and form a light distribution pattern such as a high beam by using light emitted from these lamps.
In the above embodiment, the vehicle lamp 1 includes the reflector 40 as a light guide member that guides light emitted from the light source 30 to the light distribution pattern forming portion 50. However, the light guide member is not particularly limited. For example, the light guide member may be a lens, and the light emitted from the light source 30 is guided to the light distribution pattern forming unit 50 by the lens.
In the above embodiment, the 1 st reflecting portion 61 is disposed on the side opposite to the light source 30 side with respect to the light distribution pattern forming portion 50 in the direction parallel to the surface 53S as the emission surface of the light distribution pattern forming portion 50. The 2 nd reflecting portion 62 is located closer to the light distribution pattern forming portion 50 than the 1 st reflecting portion 61 in the above direction, and is located closer to the 1 st reflecting portion 61 than the light distribution pattern forming portion 50. However, the positions of the 1 st and 2 nd reflection parts 61 and 62 are not particularly limited. For example, the 2 nd reflecting portion 62 may be located on the opposite side of the light distribution pattern forming portion 50 from the 1 st reflecting portion 61 side in the above direction. In other words, the 1 st reflector 61 and the 2 nd reflector 62 may be disposed so that the light distribution pattern forming portion 50 is disposed between the 1 st reflector 61 and the 2 nd reflector 62. The 1 st reflecting portion 61 may be arranged on the opposite side of the light source 30 from the light distribution pattern forming portion 50 in the above direction.
In the above embodiment, the reflector unit 60 reflects the light twice by the reflection surface 61r of the 1 st reflection part 61 and the reflection surface 62r of the 2 nd reflection part 62, and emits the light L2B of the specific light distribution pattern PT 2. However, the reflector unit 60 may be configured to reflect at least a part of the light emitted from the light source 30 that is not guided to the light distribution pattern forming unit 50 as the specific light distribution pattern PT 2. For example, the reflector unit 60 may be configured by the 1 st reflecting portion 61, and at least a part of the light emitted from the light source 30 and not guided to the light distribution pattern forming portion 50 may be reflected by the reflecting surface 61r of the 1 st reflecting portion 61 to be the specific light distribution pattern PT 2.
In the above-described embodiment, the reflector unit 60 is configured such that light L1 emitted from the reflection control surface 51S of the light distribution pattern forming portion 50 in another predetermined direction different from the predetermined direction enters the reflector unit 60, and the reflector unit 60 reflects the light L1C toward the light absorbing member 80. However, the light source 30, the reflector 40, the light distribution pattern forming portion 50, the reflector unit 60, and the light absorbing member 80 may be arranged so that the light L1C emitted from the reflection control surface 51S is directly incident on the light absorbing member 80. At this time, it is preferable that the light L1A emitted from the light source 30 and reflected by the reflector 40, the light L2A emitted from the light source 30 and reflected by the 1 st reflecting portion 61 of the reflector unit 60, the light L1B having a predetermined light distribution pattern emitted from the reflection control surface 51S, and the light L2B emitted from the reflector unit 60 are arranged so as not to enter the light absorbing member 80.
In the above embodiment, the vehicle lamp 1 includes the projection lens 70 formed of 1 lens. However, the projection lens 70 included in the vehicle lamp 1 may be a lens group formed by a plurality of lenses arranged in the optical axis direction, and the plurality of lenses arranged may include a plurality of lenses among a convex lens, a concave lens, a free-form surface lens, and the like. The vehicle lamp 1 may not include the projection lens 70.
In the above embodiment, the light distribution pattern forming portion 50 is a so-called DMD. However, the light distribution pattern forming unit 50 may reflect the incident light to emit light having a predetermined light distribution pattern, and may change the predetermined light distribution pattern. For example, LCOS (Liquid Crystal On Silicon) which is a reflective Liquid Crystal panel can be used as the light distribution pattern forming portion. In the case where the light distribution pattern forming portion is the LCOS, the vehicle lamp 1 may not include the light absorbing member 80.
The LCOS includes: a silicon substrate having a plurality of electrodes arranged in a matrix on a surface thereof, the electrodes being independently controlled in potential; a transparent electrode; and a liquid crystal layer sandwiched between the electrodes and the transparent electrode. In the LCOS, the potentials of the plurality of electrodes are controlled independently of each other, and thus the refractive index of the liquid crystal layer sandwiched between each electrode and the transparent electrode is changed independently. Therefore, light entering from the transparent electrode side, reflected by the electrode, and emitted from the transparent electrode side transmits through the liquid crystal layer having a refractive index corresponding to the potential of the electrode. Therefore, the phase of light incident on the LCOS is adjusted at the portions corresponding to the electrodes, and light having a modulated phase distribution is emitted from the LCOS. Since lights having different phases are diffracted by mutually coherent interference, the LCOS diffracts the incident light according to a pattern formed by the refractive index of the liquid crystal layer corresponding to each electrode, and emits light of a light distribution pattern based on the pattern of the refractive index. As described above, in the LCOS, light incident from the transparent electrode side is reflected by the electrode and emitted from the transparent electrode side, and a light distribution pattern is formed by the light emitted from the transparent electrode side. Therefore, in the LCOS, the surface of the electrode on the transparent electrode side is a reflection surface for reflecting light, and a light distribution pattern is formed by the light reflected by the surface of the electrode on the transparent electrode side. In addition, the LCOS can change the light distribution pattern formed by the light reflected by the surface of the electrode on the transparent electrode side by controlling the potentials of the plurality of electrodes.
Industrial applicability
According to the present invention, a vehicle lamp can be used in the field of vehicle lamps such as automobiles, etc., by changing the light distribution pattern of the emitted light and improving energy efficiency.
Claims (9)
1. A vehicle lamp is characterized by comprising:
a housing;
a light source;
a light distribution pattern forming portion that reflects incident light and emits light having a predetermined light distribution pattern, and that is capable of changing the predetermined light distribution pattern;
a light guide member that guides a part of light emitted from the light source to the light distribution pattern forming portion; and
a reflector unit that reflects another part of the light emitted from the light source into a specific light distribution pattern.
2. The vehicular lamp according to claim 1,
the reflector unit has: a 1 st reflecting part that reflects the other part of the light emitted from the light source; and a 2 nd reflecting portion that reflects the light reflected by the 1 st reflecting portion into the specific light distribution pattern.
3. The vehicular lamp according to claim 2,
in a predetermined direction parallel to an emission surface of light emitted from the light distribution pattern forming portion, the 1 st reflecting portion is located closer to a side opposite to the light source side than the light distribution pattern forming portion, and the 2 nd reflecting portion is located closer to the light distribution pattern forming portion side than the 1 st reflecting portion and closer to the 1 st reflecting portion side than the light distribution pattern forming portion.
4. The vehicular lamp according to claim 2 or 3,
further comprises a projection lens through which the light emitted from the light distribution pattern forming part and the light reflected by the reflector unit are transmitted,
the 2 nd reflecting portion intersects a reference plane including an emission surface of the light emitted from the light distribution pattern forming portion.
5. The vehicular lamp according to any one of claims 1 to 3,
further comprises a projection lens through which the light emitted from the light distribution pattern forming part and the light reflected by the reflector unit are transmitted,
a 1 st incident region on which light emitted from the light distribution pattern forming portion enters and a 2 nd incident region on which light reflected by the reflector unit enters in an incident surface of the projection lens do not overlap with each other.
6. The vehicular lamp according to any one of claims 1 to 3,
further comprises a projection lens through which the light emitted from the light distribution pattern forming part and the light reflected by the reflector unit are transmitted,
the light guide member is a reflector having a reflection surface and traverses the entire region between the projection lens and the light source.
7. The vehicular lamp according to claim 1,
the reflection part of the light distribution pattern forming part is provided with a plurality of reflection elements, the plurality of reflection elements can be respectively and independently switched into a 1 st tilting state tilting to one side at a preset angle and a 2 nd tilting state tilting to the other side at a preset angle,
the light distribution pattern forming unit controls the tilt state of the plurality of reflecting elements of the reflecting unit over time.
8. The vehicular lamp according to claim 1,
the light source device further includes a light absorbing member having light absorption property, which is disposed below the light distribution pattern forming portion and behind the light source.
9. The vehicular lamp according to claim 1,
the light distribution pattern forming portion is any one of a digital micromirror device and liquid crystal silicon-on-insulator.
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| JP2019127256 | 2019-07-08 |
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| CN202021331819.3U Active CN212657653U (en) | 2019-07-08 | 2020-07-08 | Vehicle lamp |
| CN202010653904.XA Active CN112197240B (en) | 2019-07-08 | 2020-07-08 | Lamp for vehicle |
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| CN202010653904.XA Active CN112197240B (en) | 2019-07-08 | 2020-07-08 | Lamp for vehicle |
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| JP (1) | JPWO2021006281A1 (en) |
| CN (2) | CN212657653U (en) |
| WO (1) | WO2021006281A1 (en) |
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| CN113757618A (en) * | 2020-06-01 | 2021-12-07 | 株式会社小糸制作所 | Vehicle lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006172840A (en) * | 2004-12-15 | 2006-06-29 | Koito Mfg Co Ltd | Vehicular headlight |
| JP4409449B2 (en) * | 2005-01-07 | 2010-02-03 | スタンレー電気株式会社 | Vehicle lighting |
| JP4508168B2 (en) * | 2006-07-27 | 2010-07-21 | 市光工業株式会社 | Vehicle headlamp |
| CN202938188U (en) * | 2012-10-14 | 2013-05-15 | 重庆雷本光电科技有限公司 | LED car light |
| JP6317087B2 (en) * | 2013-10-11 | 2018-04-25 | 株式会社小糸製作所 | Vehicle lighting |
| JP6214389B2 (en) * | 2013-12-26 | 2017-10-18 | 株式会社小糸製作所 | Vehicle lighting |
| JP2015144059A (en) * | 2014-01-31 | 2015-08-06 | 株式会社小糸製作所 | Vehicle headlamp |
| JP6518459B2 (en) * | 2015-03-02 | 2019-05-22 | 株式会社小糸製作所 | Vehicle lamp |
| JP6639163B2 (en) * | 2015-09-07 | 2020-02-05 | トヨタ自動車株式会社 | Vehicle lighting |
| JP6416736B2 (en) * | 2015-11-12 | 2018-10-31 | トヨタ自動車株式会社 | Vehicle headlamp |
| JP2017208208A (en) * | 2016-05-17 | 2017-11-24 | 株式会社小糸製作所 | Lamp |
| FR3051884A1 (en) * | 2016-05-27 | 2017-12-01 | Koito Mfg Co Ltd | VEHICLE LAMP |
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- 2020-07-07 JP JP2021530708A patent/JPWO2021006281A1/ja active Pending
- 2020-07-07 WO PCT/JP2020/026605 patent/WO2021006281A1/en active Application Filing
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- 2020-07-08 CN CN202010653904.XA patent/CN112197240B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757618A (en) * | 2020-06-01 | 2021-12-07 | 株式会社小糸制作所 | Vehicle lamp |
| CN113757618B (en) * | 2020-06-01 | 2024-05-07 | 株式会社小糸制作所 | Lamp for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112197240B (en) | 2023-06-13 |
| JPWO2021006281A1 (en) | 2021-01-14 |
| CN112197240A (en) | 2021-01-08 |
| WO2021006281A1 (en) | 2021-01-14 |
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| GR01 | Patent grant | ||
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