CN209893295U - Vehicle lamp - Google Patents

Vehicle lamp Download PDF

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Publication number
CN209893295U
CN209893295U CN201920579659.5U CN201920579659U CN209893295U CN 209893295 U CN209893295 U CN 209893295U CN 201920579659 U CN201920579659 U CN 201920579659U CN 209893295 U CN209893295 U CN 209893295U
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China
Prior art keywords
light
distribution pattern
light distribution
lamp
spatial
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CN201920579659.5U
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Chinese (zh)
Inventor
达川正士
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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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
    • 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]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F21S41/19—Attachment of light sources or lamp holders
    • 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
    • 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
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/64—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • 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
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • 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
    • 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 discloses in the vehicle lamp that possesses spatial light modulator, on the basis of the luminance of the precision of the light control that is carried out by spatial light modulator and the grading pattern that utilizes this light control to form, can expand the light irradiation scope. The vehicle lamp is: on both the left and right sides of the light control region of the spatial light modulator, a plurality of light emitting elements are arranged with their light emitting surfaces facing the projection lens. Then, by additionally lighting these light emitting elements, a second light distribution pattern obtained by combining inverted projected images of the respective light emitting elements is additionally formed on the first light distribution pattern formed by the light control of the spatial light modulator. Thus, the lamp light distribution pattern formed by the irradiation light from the entire lamp can be formed into a light distribution pattern having a large diffusion angle without being limited by the size of the light control region while maintaining the accuracy of the light control by the spatial light modulator and the luminance of the first light distribution pattern.

Description

Vehicle lamp
Technical Field
The utility model relates to a vehicle lamp that possesses spatial light modulator.
Background
Conventionally, there is known a vehicle lamp structure configured to form a desired light distribution pattern by irradiating light from a light source toward the front of the lamp through a spatial light modulator and a projection lens, as described in, for example, "patent document 1".
The spatial light modulator includes a light control region in which a plurality of light control elements are arranged, and is configured to control a spatial distribution of light incident on the projection lens.
Patent document 1: japanese patent laid-open publication No. 2015-22811
In the vehicle lamp described in the above-mentioned "patent document 1", although various light distribution patterns can be formed with high accuracy by the light control by the spatial light modulator, it is difficult to form a light distribution pattern having a larger diffusion angle because the maximum size of the light distribution pattern is defined by the size of the light control region of the spatial light modulator.
On the other hand, in such a vehicle lamp, although the light irradiation range can be expanded if the position in the front-rear direction of the lamp when the spatial light modulator is disposed is appropriately adjusted, in this case, the accuracy of light control by the spatial light modulator is lowered, and the luminance of the light distribution pattern is also lowered.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle lamp including a spatial light modulator, which can expand a light irradiation range while maintaining accuracy of light control by the spatial light modulator and luminance of a light distribution pattern formed by the light control.
The present invention achieves the above object by providing a structure in which a predetermined light emitting element is additionally arranged.
That is, the vehicle lamp of the present invention is configured to form a desired light distribution pattern by irradiating light from a light source toward the front of the lamp through a spatial light modulator and a projection lens,
the lamp for a vehicle is characterized in that,
the spatial light modulator includes a light control region in which a plurality of light control elements are arranged,
at least one light emitting element is disposed around the light control region in a state where a light emitting surface of the light emitting element faces the projection lens.
The "spatial light modulator" is not particularly limited as long as it has a light control region in which a plurality of light control elements are arranged, and a configuration using, for example, a light transmissive liquid crystal shutter, a reflective liquid crystal, or a Digital Micromirror (DMD) can be employed.
The "at least one light-emitting element" is not particularly limited as long as it is disposed around the light control region of the spatial light modulator.
In the vehicle lamp of the present invention, the spatial distribution of light incident on the projection lens is controlled by the spatial light modulator, so that various light distribution patterns can be formed with high accuracy.
In addition, since at least one light emitting element is disposed around the light control region of the spatial light modulator in a state where the light emitting surface faces the projection lens, the following operational effects can be obtained.
That is, by additionally lighting these at least one light emitting element, it is possible to additionally form a second light distribution pattern, which is formed as an inverted projected image of each light emitting element, to the first light distribution pattern formed by the light control of the spatial light modulator.
Therefore, the lamp light distribution pattern formed by the irradiation light from the entire lamp can be formed into a light distribution pattern having a large diffusion angle without being limited by the size of the light control region of the spatial light modulator while maintaining the accuracy of the light control by the spatial light modulator and the luminance of the first light distribution pattern formed by the light control.
As described above, according to the present invention, in the vehicle lamp including the spatial light modulator, the light irradiation range as the lamp light distribution pattern can be expanded while maintaining the accuracy of the light control by the spatial light modulator and the luminance of the first light distribution pattern formed by the light control.
In the above configuration, if the at least one light emitting element is further disposed on each of the left and right sides of the light control region of the spatial light modulator, the lamp light distribution pattern can be formed as a light distribution pattern in which the second light distribution pattern is disposed on each of the left and right sides of the first light distribution pattern, and thus the visibility of the traveling path ahead of the vehicle can be improved.
In the above configuration, if the at least one light emitting element is further disposed on the front side of the lamp than the light control region of the spatial light modulator, the following operational effects can be obtained.
That is, in order to maintain the luminance of the first light distribution pattern formed by the light control while maintaining the accuracy of the light control by the spatial light modulator, it is preferable that the spatial light modulator is arranged so that its light control region is located in the vicinity of the rear focal point of the projection lens.
In such a spatial light modulator, by configuring at least one light emitting element to be positioned on the front side of the lamp with respect to the light control region thereof, it is possible to form an inverted projected image of each light emitting element by the projection lens into a relatively large blurred image.
Therefore, even if at least one light emitting element is not disposed in close contact with the light control region of the spatial light modulator around the light control region, the second light distribution pattern can be formed in a state of being partially overlapped with the first light distribution pattern. In addition, the lamp light distribution pattern can be formed as a continuous and natural light distribution pattern.
In the above configuration, if the at least one light emitting element is further arranged in two stages, the second light distribution pattern can be formed as a light distribution pattern having a large vertical width.
Further, with such a configuration, the above-described operational effects can be obtained even when the low beam pattern and the high beam pattern are selectively formed as the lamp light distribution pattern.
That is, when forming the pattern for low beam, the second light distribution pattern can be formed as a part of the pattern for low beam by additionally lighting only the light emitting element located on the upper stage, and on the other hand, when forming the pattern for high beam, the second light distribution pattern can be formed as a part of the pattern for high beam by additionally lighting only the light emitting element located on the lower stage, or additionally lighting the light emitting elements located on the upper and lower stages.
Drawings
Fig. 1 is a front view showing a vehicle lamp according to an embodiment of the present invention.
Fig. 2 is a sectional view taken along line II-II of fig. 1.
Fig. 3 is a sectional view taken along line III-III of fig. 1.
Fig. 4 is a detailed view of a main portion of fig. 2.
Fig. 5 is a perspective view showing a light distribution pattern formed by irradiation light from the above-described vehicle lamp, fig. 5(a) is a view showing an additional light distribution pattern in a light distribution pattern for a high beam, and fig. 5(b) is a view showing an additional light distribution pattern in an intermediate light distribution pattern.
Fig. 6 is a view similar to fig. 1 showing a modification of the above embodiment.
Fig. 7 is a perspective view showing a light distribution pattern formed by irradiation light from the vehicle lamp according to the above-described modification, fig. 7(a) is a view showing a light distribution pattern for low beam, and fig. 7(b) is a view showing a light distribution pattern for high beam.
Description of the reference numerals
2 opposite vehicle
10. 110 vehicle lamp
20. 120 spatial light modulator subassembly
22 spatial light modulator
22a light control area
22b peripheral edge portion
22c, 24a terminal pin
22s micro-mirror (light control component)
24 socket
30 support substrate
30a opening part
30b shaft insertion hole
40. 140 support
40A, 140A vertical surface portion
Openings 40Aa and 140Aa
40Ab screw hole
40Ac shaft locating hole
40Ad sleeve
40B horizontal plane part
Opening part of 40Ba
42 light emitting element
42a light emitting surface
50 radiator
50a protrusion part
50b heat sink
52 stepped bolt
52a head
52b large diameter part
52c small diameter part
54 spring
56 shaft
60 light source side subassembly
62 light source
64 reflector
64a reflecting surface
66 base member
70 lens side subassembly
72 projection lens
72A first lens
72B second lens
74 lens holding frame
Ax optical axis
CL1 lower cutoff line
CL2 upper cutoff
E inflection point
F back side focus
Additional light distribution pattern of PA and PAm
Light distribution pattern for PH1 and PH2 high beam lamps
Pi-inverted shadowgraph image
Light distribution pattern for PL1 and PL2 dipped headlight
PM1 intermediate light distribution pattern
P1, P1m, P3 and P3L first light distribution patterns
P1a rectangular area
Second light distribution patterns P2L, P2R, P4L, P4R, P5L and P5R
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a front view showing a vehicle lamp 10 according to an embodiment of the present invention. In addition, fig. 2 is a sectional view taken along line II-II of fig. 1, and fig. 3 is a sectional view taken along line III-III of fig. 1.
In these figures, the direction indicated by X is "forward" with respect to the lamp (also "forward" with respect to the vehicle), the direction indicated by Y is "left" perpendicular to "forward" (also "left" with respect to the vehicle, but is "right" when viewed from the front of the lamp), and the direction indicated by Z is "upper". The same applies to the other figures.
As shown in these drawings, the vehicle lamp 10 of the present embodiment is a headlamp provided at a front end portion of a vehicle, and is configured as a projection-type lamp unit that is incorporated into a lamp chamber formed by a lamp body and a translucent cover, not shown.
The vehicle lamp 10 includes a spatial light modulator sub-assembly 20, a light source side sub-assembly 60, and a lens side sub-assembly 70. The vehicle lamp 10 is supported by the lamp body via a mounting structure, not shown, on a bracket 40, which is a component of the spatial light modulator sub-assembly 20.
As shown in fig. 2, the light source side unit 60 includes a light source 62, a reflector 64 for reflecting light emitted from the light source 62 toward the spatial light modulator unit 20, and a base member 66 for supporting them.
The spatial light modulator sub-assembly 20 includes a spatial light modulator 22, a support substrate 30 disposed on the lamp rear side of the spatial light modulator 22, a holder 40 disposed on the lamp front side of the support substrate 30, and a heat sink 50 disposed on the lamp rear side of the spatial light modulator 22.
The lens-side subassembly 70 is configured to include a projection lens 72 having an optical axis Ax extending in the vehicle longitudinal direction, and a lens holder 74 for supporting the projection lens 72.
In the vehicle lamp 10 of the present embodiment, the light from the light source 62 reflected by the reflector 64 is irradiated toward the front of the lamp via the spatial light modulator 22 and the projection lens 72, whereby a desired light distribution pattern can be formed with high accuracy.
To achieve this, in the assembly process of the vehicle lamp 10, the positional relationship between the spatial light modulator 22 and the projection lens 72 is finely adjusted in a state where the light source 62 is turned on to form a light distribution pattern, so that the positional relationship accuracy is improved.
Next, specific structures of the spatial light modulator sub-assembly 20, the light source side sub-assembly 60, and the lens side sub-assembly 70 will be described.
First, before the structure of the spatial light modulator sub-assembly 20 is described, the structure of the light source side sub-assembly 60 will be described.
The light source 62 is a white light emitting diode, and is fixed and supported to the base member 66 with its light emitting surface 42a directed obliquely upward and forward. The base member 66 is fixed to and supported by the support 40 of the spatial light modulator subassembly 20.
The reflector 64 is disposed so as to cover the light source 62 from the front side of the lamp, and is fixed to and supported by the base member 66 at the peripheral edge portion of the reflector 64. The reflector 64 reflects the light emitted from the light source 62 obliquely upward and rearward. At this time, the reflecting surface 64a of the reflector 64 is formed so as to converge the light emitted from the light source 62 in the vicinity of the rear focal plane including the rear focal point F of the projection lens 72.
Next, the structure of the spatial light modulator subassembly 20 will be explained.
Fig. 4 is a detailed view of a main portion of fig. 2.
As shown in the same drawing, the spatial light modulator 22 is a reflective spatial light modulator and is configured by a Digital Micromirror Device (DMD) provided with a light control region 22a, and the light control region 22a is formed by arranging a plurality of (for example, several hundred thousand) micromirrors 22s (see fig. 1) as light control elements in a matrix.
The spatial light modulator 22 is configured to be able to selectively switch the direction of reflection of the light from the light source 62 that reaches the light control region 22a by controlling the angle of the reflection surface of each of the plurality of micromirrors 22s that constitute the light control region 22 a. Specifically, a mode in which the light from the light source 62 is reflected toward the projection lens 72 and a mode in which the light from the light source 62 is reflected in other directions (i.e., directions that do not adversely affect the formation of the light distribution pattern) may be selected.
The spatial light modulator 22 is disposed in a state where the front surface of the light control region 22a extends along a vertical plane orthogonal to the optical axis Ax at the position of the rear focal point F of the projection lens 72, and the light control region 22a has a laterally long rectangular outer shape centered on the optical axis Ax.
In the spatial light modulator 22, a peripheral portion 22b surrounding the light control region 22a is formed in a state where its front surface is moved rearward toward the lamp rear side with respect to the front surface of the light control region 22a, and is supported on the support substrate 30 at its rear surface via a socket 24.
The socket 24 is configured as a rectangular frame member extending in the lateral direction along the peripheral edge portion 22b of the spatial light modulator 22, and is fixed to the support substrate 30 in a state of being electrically connected to a conductive pattern (not shown) formed on the support substrate 30. The support substrate 30 is formed with an opening 30a having substantially the same shape as the inner peripheral edge of the socket 24.
A plurality of terminal pins 22c protruding from the rear surface of the spatial light modulator 22 toward the rear of the lamp are formed on the peripheral edge portion 22 b. On the other hand, a plurality of terminal pins 24a protruding from the rear surface thereof toward the rear of the lamp are formed on the socket 24 at positions corresponding to the plurality of terminal pins 22 c.
The base end portions of the terminal pins 24a of the receptacle 24 (i.e., the tip end portions embedded in the receptacle 24) are formed in a substantially cylindrical shape, and the tip end portions of the terminal pins 22c of the spatial light modulator 22 are fitted into the base end portions, whereby the spatial light modulator 22 and the receptacle 24 are electrically connected.
Each terminal pin 24a of the socket 24 is soldered at its tip end portion (i.e., rear end portion) to the conductive pattern of the support substrate 30. Therefore, the socket 24 is disposed in a state where its rear surface slightly floats from the front surface of the support substrate 30.
Spatial light modulator subassembly 20 is a structure whose spatial light modulator 22 is supported by a bracket 40 and a heat sink 50 from both sides in the front-rear direction of the lamp.
The bracket 40 is a member made of metal (for example, made of aluminum die-cast) and has a vertical surface portion 40A extending along a vertical surface perpendicular to the optical axis Ax and a horizontal surface portion 40B extending from a lower end edge of the vertical surface portion 40A toward the front of the lamp along a horizontal plane.
As shown in fig. 1, a horizontally long rectangular opening 40Aa is formed in the vertical surface portion 40A of the holder 40 around the optical axis Ax. The aperture 40Aa has a laterally elongated rectangular aperture shape smaller than the outer peripheral edge shape of the spatial light modulator 22 but slightly larger than the light control region 22 a.
The front surface of the vertical surface portion 40A is positioned further toward the front side of the lamp than the front surface of the light control region 22a (i.e., further toward the front side of the lamp than the rear focal point F of the projection lens 72). Specifically, the front surface of the vertical surface portion 40A is located at a position 3 to 5mm from the front surface of the light control region 22a toward the front side of the lamp. Four light-emitting elements 42 are mounted on the left and right sides of the opening 40Aa on the front surface of the vertical surface portion 40A.
Each light emitting element 42 is a white light emitting diode, and has a light emitting surface 42a having a rectangular outer shape (for example, a square shape of about 1 × 1 mm).
The four light emitting elements 42 are arranged at a predetermined interval (for example, an interval of about 1 mm) in the horizontal direction. At this time, each light emitting element 42 is disposed toward the projection lens 72 in a state where the center position of the light emitting surface 42a is located slightly below a horizontal plane including the optical axis Ax. Among the four light-emitting elements 42, the light-emitting element 42 located at the end on the optical axis Ax side is disposed at a position close to the opening 40Aa (for example, at a position about 0.5mm from the side end surface of the opening 40 Aa).
The horizontal surface portion 40B of the holder 40 is formed to extend to the lamp front side of the reflector 64, and a laterally long rectangular opening 40Ba for inserting the reflector 64 is formed in the horizontal surface portion 40B.
As shown in fig. 3, the heat sink 50 is a metal (e.g., aluminum die-cast) member, and is disposed so as to extend along a vertical plane orthogonal to the optical axis Ax, and has a plurality of fins 50b formed in a vertical stripe pattern on a rear surface thereof.
A prismatic protrusion 50a protruding toward the front of the lamp is formed at the center of the front surface of the heat sink 50. The projection 50a has a laterally long rectangular cross-sectional shape centered on the optical axis Ax, and its size is set to a value smaller than the inner peripheral surface shape of the receptacle 24. The protrusion 50a abuts against the central portion of the spatial light modulator 22 (i.e., the portion where the light control region 22a is located) from the lamp rear side at the front end surface of the protrusion 50a in a state where the protrusion is inserted through the opening 30a of the support substrate 30.
The heat sink 50 is fixed to the vertical surface portion 40A of the bracket 40 by two pairs of left and right stepped bolts 52 in a state where the front end surface of the protrusion 50A abuts on the central portion of the spatial light modulator 22. This fixing is performed in a state where the spatial light modulator 22 is elastically pressed toward the front of the lamp by the protrusion 50 a.
The specific structure for performing this pressing is as follows.
That is, the two pairs of left and right stepped bolts 52 are disposed at two upper and lower positions on the left and right sides of the spatial light modulator 22.
Each stepped bolt 52 is screwed to the vertical surface portion 40A of the bracket 40 at a small diameter portion 52c (see fig. 1) at the tip end thereof in a state where the large diameter portion 52b is inserted from the lamp rear side through a bolt insertion hole (not shown) formed in the heat sink 50 and the support substrate 30. In order to achieve the above, screw holes 40Ab (see fig. 1) for screwing the small diameter portions 52c of the stepped bolts 52 are formed in the vertical surface portion 40A of the bracket 40 at four locations corresponding to the four stepped bolts 52.
A spring 54 for elastically pressing the protrusion 50a of the heat sink 50 toward the front side of the lamp is attached to the large diameter portion 52b of each stepped bolt 52. Each spring 54 is formed of a compression spring disposed between the head 52a of each stepped bolt 52 and the heat sink 50.
In this way, by elastically pressing the heat sink 50 toward the front side of the lamp at the upper and lower portions on both the left and right sides of the spatial light modulator 22, the central portion of the spatial light modulator 20 is elastically pressed toward the front side of the lamp without applying an undue load to the spatial light modulator 20. In addition, this maintains a state in which the plurality of terminal pins 22c formed in the peripheral edge portion 22b of the spatial light modulator 22 are properly fitted into the plurality of fitting holes formed in the receptacle 24 (i.e., the proximal end portions of the terminal pins 24a formed in a substantially cylindrical shape) (i.e., a state in which the spatial light modulator 22 and the receptacle 24 are reliably electrically connected).
Around the spatial light modulator 22, a pair of left and right shafts 56 extending in the front-rear direction of the lamp are disposed in a state of being fixed to the heat sink 50 at rear end portions of the shafts 56. Specifically, the shafts 56 are formed integrally with the heat sink 50, and are formed to extend in a columnar shape toward the front of the lamp on both left and right sides of the protrusion 50a of the heat sink 50.
As shown in fig. 3, a pair of left and right shaft insertion holes 30b for inserting the pair of left and right shafts 56 are formed in the support substrate 30. Each shaft insertion hole 30b is formed as a cylindrical opening portion having a diameter larger than each shaft 56 to some extent.
Further, a pair of left and right shaft positioning holes 40Ac for positioning in a direction orthogonal to the front-rear direction of the lamp in a state where the distal ends of the pair of left and right shafts 56 are inserted are formed in the vertical surface portion 40A of the bracket 40. Each shaft positioning hole 40Ac is formed with a slightly larger diameter than each shaft 56.
Each of the shaft positioning holes 40Ac is formed by a sleeve 40Ad formed on the rear surface of the vertical surface portion 40A so as to be longer than the plate thickness of the vertical surface portion 40A and extend toward the rear of the lamp, and thereby can be slidably engaged with each of the shafts 56 over a certain length. Thus, the vertical surface portion 40A of the holder 40 is prevented from being inclined with respect to the vertical surface orthogonal to the optical axis Ax.
Next, the structure of the lens side subassembly 70 will be explained.
As shown in fig. 4, the projection lens 72 is constituted by first and second lenses 72A, 72B disposed at a desired interval in the lamp front-rear direction on the optical axis Ax.
The first lens 72A positioned on the front side of the lamp is configured as a biconvex lens, and the second lens 72B positioned on the rear side of the lamp is configured as a meniscus lens bulging toward the rear of the lamp. In this case, the first and second lenses 72A and 72B have their upper ends slightly cut off along the horizontal plane and their lower ends largely cut off along the horizontal plane.
The first and second lenses 72A and 72B are supported by a common lens holding frame 74 at their outer peripheral edges. The lens holder 74 is a metal (e.g., aluminum die-cast) member, and is supported by the horizontal surface portion 40B of the holder 40.
Fig. 5 is a perspective view showing a light distribution pattern formed on a virtual vertical screen arranged at a position 25m ahead of the vehicle by light emitted forward from the vehicle lamp 10. At this time, fig. 5(a) is a view showing the additional light distribution pattern PA in the light distribution pattern PH1 for a high beam, and fig. 5(b) is a view showing the additional light distribution pattern PAm in the intermediate light distribution pattern PM 1.
The light distribution pattern PH1 for high beam shown in fig. 5(a) is a pattern in which an additional light distribution pattern PA formed by irradiation light from the vehicle lighting device 10 is added to a light distribution pattern PL1 for low beam formed by irradiation light from another lighting unit, not shown.
The low beam light distribution pattern PL1 is a low beam light distribution pattern for left light distribution, and has cutoff lines CL1 and CL2 having different left and right heights at the upper end edge thereof. The cutoff lines CL1 and CL2 extend horizontally at different heights from left to right with a V-V line passing through a vanishing point H-V in the front direction of the lamp in the vertical direction as a boundary, an opposite vehicle-line side portion on the right side of the V-V line is formed as a lower cutoff line CL1, and a vehicle-line side portion on the left side of the V-V line is formed as an upper cutoff line CL2 which is elevated from the lower cutoff line CL1 via an inclined portion.
In the low beam light distribution pattern PL1, an inflection point E, which is an intersection of a lower cutoff line CL1 and a V-V line, is located at about 0.5 to 0.6 DEG below H-V.
The additional light distribution pattern PA is formed as a synthesized light distribution pattern of the first light distribution pattern P1 and the pair of left and right second light distribution patterns P2L and P2R.
The first light distribution pattern P1 is a light distribution pattern formed by light from the light source 62 that is sequentially reflected by the reflector 64 and the spatial light modulator 22 and transmitted through the projection lens 72, and is formed by light reflected from the entire light control region 22a of the spatial light modulator 22.
The first light distribution pattern P1 is formed as a light distribution pattern having an outer shape of a laterally long rectangle centered on H-V. Since the first light distribution pattern P1 is formed as an inverted projected image of the light control region 22a, its size is defined by the outer shape of the light control region 22 a.
The pair of left and right second light distribution patterns P2L, P2R are formed by light emitted from the light emitting element 42 and directly incident on the projection lens 72, and four light emitting elements 42 are arranged on each of the left and right sides of the opening 40Aa of the vertical surface portion 40A of the holder 40.
The second light distribution patterns P2L and P2R are formed as a laterally long light distribution pattern obtained by combining the inverted projected images Pi of the four light-emitting elements 42, respectively. At this time, the second light distribution pattern P2L on the left side is formed by the inverted projection images Pi of the four light-emitting elements 42 on the right side (left side when viewed from the front of the lamp), and the second light distribution pattern P2R on the right side is formed by the inverted projection images Pi of the four light-emitting elements 42 on the left side.
Since each light emitting element 42 is disposed such that the center position of the light emitting surface 42a thereof is positioned slightly below a horizontal plane including the optical axis Ax, each inverted projected image Pi is formed across an H-H line passing through H-V in the horizontal direction in a state of being displaced slightly upward from the H-H line.
Further, although the four light emitting elements 42 are arranged at intervals from each other in the left-right direction, the light emitting surfaces 42a thereof are positioned on the lamp front side with respect to the rear focal point F of the projection lens 72, and therefore the inverted projected images Pi of the light emitting elements 42 are formed as substantially rectangular images with relatively large blur, and the four inverted projected images Pi constituting the second light distribution patterns P2L, P2R are formed in a state of being partially overlapped with each other.
Further, since the light emitting element 42 located at the end portion on the optical axis Ax side among the four light emitting elements 42 is disposed at a position close to the opening portion 40Aa, the second light distribution patterns P2L, P2R are formed in a state where the inverted projected image Pi located at the end portion on the V-V line side thereof partially overlaps the first light distribution pattern P1.
The intermediate light distribution pattern PM1 shown in fig. 5(b) is a light distribution pattern formed in a state where the additional light distribution pattern PAm is partially missing from the additional light distribution pattern PA in the light distribution pattern PH1 for high beam.
Specifically, the additional light distribution pattern PAm is a light distribution pattern in which a part of the first light distribution pattern P1 is missing from the additional light distribution pattern PA (specifically, a light distribution pattern in which light directed to a rectangular region P1a including the oncoming vehicle 2 is missing). The additional light distribution pattern PAm is a light distribution pattern formed by performing light control in which light from the light source 62 is not reflected toward the projection lens 72 in a partial region of the light control region 22a of the spatial light modulator 22.
By forming such an additional light distribution pattern PAm, the illumination light from the vehicle lamp 10 does not illuminate the oncoming vehicle 2, thereby illuminating the forward traveling path as widely as possible within a range that does not cause glare to the driver of the oncoming vehicle 2.
Then, by sequentially switching the areas in which the reflected light is missing in the light control area 22a in accordance with the change in the position of the oncoming vehicle 2, the state in which the forward traveling path is irradiated as widely as possible within the range in which the driver of the oncoming vehicle 2 is not dazzled is maintained.
At this time, the presence of the oncoming vehicle 2 is detected by an on-board camera or the like, not shown. Even when a preceding vehicle exists on the forward traveling road or a pedestrian exists on a shoulder portion of the forward traveling road, glare is not caused by detecting the above and performing light control of the spatial light modulator 22.
Further, when the oncoming vehicle 2 is positioned further closer to the vehicle, by sequentially deleting some of the four inverted projection images Pi constituting the second light distribution pattern P2R positioned on the right side, it is possible to further maintain a state in which the forward travel path is irradiated as widely as possible within a range in which the driver of the oncoming vehicle 2 is not dazzled.
Next, the operation of the present embodiment will be explained.
In the vehicle lamp 10 of the present embodiment, by controlling the spatial distribution of light incident on the projection lens 72 by the spatial light modulator 22, various light distribution patterns can be formed with high accuracy.
In addition, since the four light-emitting elements 42 are disposed on both the left and right sides of the light control region 22a of the spatial light modulator 22 in a state where the light-emitting surfaces 42a thereof face the projection lens 72, the following operational effects can be obtained.
That is, by additionally lighting the four light emitting elements 42, it is possible to additionally form the second light distribution patterns P2L and P2R, which are formed as a light distribution pattern by synthesizing the inverted projected images Pi of the respective light emitting elements, to the first light distribution pattern P1 (or P1m) formed by the light control of the spatial light modulator 22.
Therefore, the additional light distribution pattern PA (or PAm), which is a lamp light distribution pattern formed by irradiation light from the entire lamp, can be formed into a light distribution pattern having a large diffusion angle without being limited by the size of the light control region 22a of the spatial light modulator 22 while maintaining the accuracy of light control by the spatial light modulator 22 and the luminance of the first light distribution pattern P1 (or P1m) formed by the light control.
As described above, according to the present embodiment, in the vehicle lamp 10 including the spatial light modulator 22, the light irradiation range as the additional light distribution pattern PA (or PAm) can be expanded while maintaining the accuracy of the light control by the spatial light modulator 22 and the luminance of the first light distribution pattern P1 (or P1m) formed by the light control.
At this time, in the present embodiment, since the four light emitting elements 42 are disposed on the left and right sides of the light control region 22a of the spatial light modulator 22, the additional light distribution pattern PA (or PAm) can be formed as a light distribution pattern in which the second light distribution patterns P2L and P2R are disposed on the left and right sides of the first light distribution pattern P1 (or P1m), and thus the visibility of the traveling path ahead of the vehicle can be improved.
In the present embodiment, since the four light-emitting elements 42 disposed on the left and right sides of the light control region 22a of the spatial light modulator 22 are disposed on the front side of the lamp with respect to the light control region 22a of the spatial light modulator 22, the following operational effects can be obtained.
That is, in order to maintain the accuracy of the light control by the spatial light modulator 22 and the brightness of the first light distribution pattern P1 (or P1m) formed by the light control, as in the present embodiment, it is preferable that the spatial light modulator 22 is disposed such that the light control region 22a is located on a focal plane including the rear focal point F of the projection lens 72.
By configuring the four light emitting elements 42 to be positioned on the front side of the lamp with respect to the light control region 22a of the spatial light modulator 22 and to be respectively arranged on the left and right sides, the inverted projected images Pi of the light emitting elements 42 by the projection lens 72 can be formed into relatively large blurred images.
Therefore, even if the four light emitting elements are not disposed in close contact with the light control region 22a around the light control region 22a of the spatial light modulator 22, the second light distribution patterns P2L and P2R can be formed in a state of being partially overlapped with the first light distribution pattern P1 (or P1 m). In addition, the additional light distribution pattern PA (or PAm) can thereby be formed as a continuous and natural light distribution pattern.
In the above-described embodiment, the configuration in which the four light-emitting elements 42 are respectively disposed on the left and right sides of the light control region 22a of the spatial light modulator 22 has been described, but a configuration in which five or more or three or less light-emitting elements 42 are respectively disposed may be employed, or a configuration in which these light-emitting elements 42 are disposed only on the left or right side of the light control region 22a may be employed.
In the above embodiment, the light emitted from the light source 62 reflected by the reflector 64 is reflected by the spatial light modulator 22, but a configuration may be adopted in which the light emitted from the light source 62 subjected to deflection control via a lens or the like is reflected by the spatial light modulator 22, or the light emitted from the light source 62 is directly reflected by the spatial light modulator 22.
Next, a modified example of the above embodiment will be explained.
Fig. 6 is a front view showing a vehicle lamp 110 according to the present modification.
As shown in the same drawing, the basic structure of the present modification is the same as that of the above embodiment, but the structure of the spatial light modulator sub-assembly 120 is partially different from that of the above embodiment.
That is, in the spatial light modulator sub-assembly 120 of the present modification, the spatial light modulator 22 and the receptacle 24 are disposed in a state displaced upward with respect to the spatial light modulator 22 and the receptacle 24 of the above-described embodiment, and the opening 140Aa formed in the vertical surface portion 140A of the holder 140 is consequently displaced upward with respect to the opening 40Aa of the above-described embodiment.
In the present modification, the four light-emitting elements 42 are mounted on the left and right sides of the opening 140Aa in the front surface of the vertical surface portion 140A in two stages.
The four light-emitting elements 42 positioned on the lower section on both the left and right sides of the opening 140Aa are arranged such that the center positions of the light-emitting surfaces 42a thereof are positioned below a horizontal plane including the optical axis Ax, and the amount of downward displacement thereof is set to a value slightly larger than that in the case of the above-described embodiment.
The four light-emitting elements 42 positioned at the upper stage on the right side (left side when viewed from the front of the lamp) of the opening 140Aa are arranged such that the center positions of the light-emitting surfaces 42a thereof are positioned above a horizontal plane including the optical axis Ax. The four light-emitting elements 42 positioned at the upper stage on the left side of the opening 140Aa are also arranged such that the center positions of the light-emitting surfaces 42a thereof are positioned above a horizontal plane including the optical axis Ax, and the amount of upward displacement thereof is set to a value slightly larger than the four light-emitting elements 42 positioned at the right side.
Fig. 7 is a perspective view showing a light distribution pattern formed on a virtual vertical screen arranged at a position 25m ahead of the vehicle by light emitted forward from the vehicle lamp 110. At this time, fig. 7(a) is a view showing the light distribution pattern PL2 for low beam, and fig. 7(b) is a view showing the light distribution pattern PH2 for high beam.
The low beam light distribution pattern PL2 shown in fig. 7(a) has cutoff lines CL1 and CL2 extending in the horizontal direction at different heights in the left-right direction and an inflection point E, similarly to the low beam light distribution pattern PL1 shown in fig. 5 (a).
The low beam light distribution pattern PL2 is formed as a synthesized light distribution pattern of the first light distribution pattern P3L and the pair of left and right second light distribution patterns P4L and P4R.
The first light distribution pattern P3L is a light distribution pattern formed by light from the light source 62 that is sequentially reflected by the reflector 64 and the spatial light modulator 22 and passes through the projection lens 72, and is formed by reflected light from a partial region of the light control region 22a of the spatial light modulator 22. Specifically, by performing light control in which light from the light source 62 is not reflected toward the projection lens 72 in the lower region of the light control region 22a, the first light distribution pattern P3L is formed as a light distribution pattern having an upper end edge along the cutoff lines CL1 and CL 2.
The lower end edge of the first light distribution pattern P3L is located below the lower end edge of the first light distribution pattern P1 (see fig. 5 a) of the above-described embodiment. This is because the spatial light modulator 22 is displaced upward as compared with the case of the above embodiment. In addition, this ensures a larger irradiation area on the lower side than the cutoff lines CL1 and CL2 as the low beam light distribution pattern PL 2.
In fig. 7(a), the outline shape of the first light distribution pattern P3 formed when light from the entire light control region 22a is reflected toward the projection lens 72 is indicated by a two-dot chain line.
The pair of left and right second light distribution patterns P4L, P4R are light distribution patterns formed by direct light from the light emitting element 42, and four light emitting elements 42 are arranged on the upper left and right sides of the opening 40Aa of the vertical surface portion 40A of the holder 40.
The shape and the formation position in the horizontal direction of each of the second light distribution patterns P4L, P4R are the same as those of the second light distribution patterns P2L, P2R of the above-described embodiment, but the position of the upper end edge thereof is different from that of the above-described embodiment in that it is substantially along the cutoff line CL1, CL 2. The vertical position adjustment of the upper end edges of the second light distribution patterns P4L and P4R can be performed by vertical position adjustment of the light-emitting elements 42 located at the upper stage.
The light distribution pattern PH2 for a high beam shown in fig. 7(b) is formed as a synthesized light distribution pattern of the first light distribution pattern P3, the pair of left and right second light distribution patterns P4L and P4R, and the pair of left and right second light distribution patterns P5L and P5R.
The first light distribution pattern P3 is a light distribution pattern formed by reflected light from the entire area of the light control region 22 a.
The pair of left and right second light distribution patterns P4L, P4R is the same as the low beam light distribution pattern PL 2.
The pair of left and right second light distribution patterns P5L, P5R are light distribution patterns formed by direct light from the light emitting element 42, and four light emitting elements 42 are arranged on the lower left and right sides of the opening 40Aa of the vertical surface portion 40A of the holder 40. The second light distribution patterns P5L and P5R are formed at equal height positions across the H-H line, but the positions are displaced slightly upward from the second light distribution patterns P2L and P2R of the above embodiment. The second light distribution patterns P5L and P5R partially overlap the second light distribution patterns P4L and P4R and the first light distribution pattern P3.
As in the vehicle lamp 110 of the present modification, even when a configuration is adopted in which the low beam pattern PL2 and the high beam pattern PH2 can be selectively formed as the lamp light distribution pattern, the same operational effects as in the case of the above-described embodiment can be obtained.
That is, when the low beam pattern PL2 is formed, the second light distribution patterns P4L and P4R can be formed as a part of the low beam pattern PL2 by additionally lighting only the light emitting element 42 located on the upper stage to the first light distribution pattern P3L formed by the light control by the spatial light modulator 22, and on the other hand, when the high beam pattern PH2 is formed, the second light distribution patterns P4L and P4R and P5L and P5R can be formed as a part of the high beam pattern PH2 by additionally lighting the light emitting element 42 located on the lower stage to the first light distribution pattern P3 formed by the light control by the spatial light modulator 22.
In addition, this makes it possible to expand the light irradiation range as the low beam pattern PL2 (or the high beam pattern PH2) while maintaining the accuracy of the light control by the spatial light modulator 22 and the brightness of the first light distribution pattern P3L (or P3) formed by the light control.
When the high beam pattern PH2 is formed, the light emitting element 42 located on the lower stage may be additionally turned on, while the light emitting element 42 located on the upper stage may be turned off.
In the above-described modification, the configuration in which the four light-emitting elements 42 are respectively arranged in two stages, i.e., the upper stage and the lower stage, on both the left and right sides of the light control region 22a of the spatial light modulator 22 has been described, but the light-emitting elements 42 may be arranged in three stages, i.e., the upper stage and the lower stage or more.
Note that the numerical values shown as parameters in the above embodiment and the modifications thereof are merely examples, and it is needless to say that they may be set to different values as appropriate.
The present invention is not limited to the configurations described in the above embodiments and modifications, and may be variously modified in addition to the above.

Claims (4)

1. A vehicle lamp is configured to form a desired light distribution pattern by irradiating light from a light source toward the front of the lamp via a spatial light modulator and a projection lens,
the lamp for a vehicle is characterized in that,
the spatial light modulator includes a light control region in which a plurality of light control elements are arranged,
at least one light emitting element is disposed around the light control region in a state where a light emitting surface of the light emitting element faces the projection lens.
2. A lamp for a vehicle as defined in claim 1,
the at least one light emitting element is disposed on each of right and left sides of the light control region.
3. The vehicular lamp according to claim 1 or 2,
the at least one light emitting element is disposed on the front side of the lamp with respect to the light control region.
4. The vehicular lamp according to claim 1 or 2,
the at least one light emitting element is disposed in two stages.
CN201920579659.5U 2018-11-22 2019-04-25 Vehicle lamp Active CN209893295U (en)

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JP6430120B2 (en) * 2014-01-23 2018-11-28 株式会社小糸製作所 Motorcycle headlights
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DE102016216616A1 (en) * 2016-09-02 2018-03-08 Osram Gmbh Lighting system and vehicle headlight with a lighting system
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