CN111076138B - Vehicle lamp and rotating reflector - Google Patents

Vehicle lamp and rotating reflector Download PDF

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Publication number
CN111076138B
CN111076138B CN201910982174.5A CN201910982174A CN111076138B CN 111076138 B CN111076138 B CN 111076138B CN 201910982174 A CN201910982174 A CN 201910982174A CN 111076138 B CN111076138 B CN 111076138B
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China
Prior art keywords
light
light emitting
rotating reflector
emitting elements
rotating
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Application number
CN201910982174.5A
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Chinese (zh)
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CN111076138A (en
Inventor
田中秀忠
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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Priority to CN202111184252.0A priority Critical patent/CN114001320A/en
Publication of CN111076138A publication Critical patent/CN111076138A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • 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
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • 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
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/05—Special features for controlling or switching of the light beam
    • B60Q2300/056—Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
    • 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
    • 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]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The invention provides a vehicle lamp and a rotating reflector, and provides a new technology for obtaining a light distribution pattern with a desired shape. In a vehicle lamp having an optical unit, the optical unit includes: a rotating reflector which rotates in one direction around a rotating shaft while reflecting light emitted from a light source; and a light source including a plurality of light emitting elements arranged in a line in a horizontal direction. The rotating reflector has a reflecting surface twisted so that light from the light source reflected while rotating scans the front to form a desired light distribution pattern. The plurality of light emitting elements are arranged such that the vertical position of the LED (20a1) that emits light reflected by the inside of the reflecting surface is located below the vertical position of the LED (20a3) that emits light reflected by the outside of the reflecting surface.

Description

Vehicle lamp and rotating reflector
Technical Field
The present invention relates to a vehicle lamp having an optical unit.
The present invention also relates to a component of an optical unit, for example, a rotating reflector that rotates about a rotation axis while reflecting light emitted from a light source.
Background
Conventionally, there has been designed an optical unit including a rotating reflector that reflects light emitted from a light source and rotates in one direction around a rotation axis (see patent document 1). The rotating reflector of the optical unit is provided with a reflecting surface so that light of the light source reflected while rotating forms a desired light distribution pattern.
In addition, a plurality of blades are provided on the rotating reflector of the optical unit in the circumferential direction of the rotating shaft, and the blades are provided with a reflecting surface for forming a desired light distribution pattern of the reflected light. Such an optical unit can form a desired light distribution pattern by rotating the rotating reflector in one direction.
In the optical unit, when light is incident simultaneously on both adjacent blades, two irradiation light beams appear simultaneously in different directions, and therefore both ends of the light distribution pattern emit light simultaneously. In this case, it is difficult to independently control the irradiation state of both end portions of the light distribution pattern. Therefore, when a part of the blade is cut off so that light enters from the light source to the reflection surface of one adjacent blade, the light from the light source does not enter the reflection surface of the other adjacent blade (see patent document 2).
Documents of the prior art
Patent document
Patent document 1: international publication No. 11/129105
Patent document 2: japanese laid-open patent publication No. 2015-5428
Disclosure of Invention
However, the reflecting surface of the rotating reflector is not necessarily flat, and even when the light from the light source reflected while rotating is used to scan the front of the vehicle, the light distribution pattern may not be in a clear shape in the horizontal direction.
The present invention has been made in view of the above circumstances, and an exemplary object thereof is to provide a novel technique for obtaining a light distribution pattern having a desired shape.
In order to solve the above problem, a vehicle lamp according to an aspect of the present invention includes an optical unit. The optical unit has: a rotating reflector which rotates in one direction around a rotating shaft while reflecting light emitted from a light source; and a light source including a plurality of light emitting elements arranged in a line in a horizontal direction. The rotating reflector has a reflecting surface twisted so that light from the light source reflected while rotating scans the front to form a desired light distribution pattern. The plurality of light emitting elements are arranged such that the upper and lower positions of the inner light emitting element that emits light reflected by the inner side of the reflecting surface are located below the upper and lower positions of the outer light emitting element that emits light reflected by the outer side of the reflecting surface.
According to this aspect, the vertical positions of some of the light emitting elements are adjusted in consideration of the deviation of the image of the light source reflected by the uneven and distorted reflection surface of the rotating reflector. This enables formation of a light distribution pattern having a desired shape.
The plurality of light emitting elements are arranged in a linear shape in the horizontal direction such that overlap of partial light distribution patterns formed by scanning light emitted from the plurality of light emitting elements reflected by the rotating reflector in front of each other is increased as compared with a case where the light emitting elements are arranged in a straight line in the horizontal direction. This increases the overlap of the partial light distribution patterns, and a bright light distribution pattern can be obtained. Here, the line shape does not mean that all the light emitting elements are arranged on a straight line, and the vertical positions of the plurality of light emitting elements may be gradually (stepwise) changed. In addition, the vertical positions of a part of the plurality of elements may be the same.
The plurality of light emitting elements have first to nth light emitting elements in this order from one end. The first to n-th light emitting elements are displaced downward from the reference vertical position by a displacement d 1 ～d n Satisfies the following formula (1).
d 1 ≤d 2 ≤d 3 ≤…≤d n-1 ≤d n (1)
(wherein, d 1 ＝d 2 ＝d 3 …＝d n-1 ＝d n Except for the case of
The projection lens projects light reflected by the rotating reflector toward the light irradiation direction of the optical unit, the rotating reflector is arranged so that the rotating axis is inclined with respect to the light irradiation direction and extends in the horizontal direction, and the light source is arranged so that each of the light emitting surfaces of the plurality of light emitting elements is inclined with respect to the reflecting surface.
The reflecting surface may have a shape twisted so that an angle formed by the optical axis and the reflecting surface changes with the direction toward the circumferential direction around the rotation axis.
It should be noted that any combination of the above-described main components and a mode in which the expression form of the present invention is converted between a method, an apparatus, a system, and the like are also effective as a mode of the present invention.
According to the present invention, a light distribution pattern having a desired shape can be obtained.
In addition, however, when a portion of the blade is cut, the rigidity of the blade may be reduced. On the other hand, if the connection surface connecting the blades is provided in order to increase the rigidity of the blades, light reflected by the connection surface may be glare.
The present invention has been made in view of the above circumstances, and an exemplary object thereof is to provide a novel technique capable of suppressing glare without reducing rigidity of a blade.
Technical solution for solving technical problem
In order to solve the above problem, a rotating reflector according to an aspect of the present invention includes: a rotating part; a plurality of blades provided around the rotating portion and separated from each other; the blade has: a reflection unit that reflects light contributing to formation of a light distribution pattern, among light emitted from the light source; and a connecting portion connected to the other separated blade and configured to prevent light emitted from the light source from being reflected in a direction in which the light becomes glare.
According to this aspect, the blades are connected by the connecting portion, so that a decrease in rigidity can be suppressed. On the other hand, even if the light emitted from the light source is reflected by the connecting portion, the light is not reflected in the direction in which the light becomes glare, and therefore, the occurrence of glare can be suppressed.
The reflection portion may have a surface shape configured to allow light contributing to formation of the light distribution pattern to enter a predetermined optical member. The connecting portion may have a surface shape configured to prevent light emitted from the light source from being directed toward the optical member. Thus, even if the light emitted from the light source is reflected by the connecting portion, the light does not go toward the optical member, and is less likely to be glare.
The connection portion may be provided around the rotation portion. Thus, for example, when the region reflecting the light emitted from the light source is a region close to the outer peripheral portion of the blade away from the rotating portion, the light of the light source incident on the connecting portion is reduced, and the occurrence of glare is suppressed.
At least a part of the connecting portion may be disposed on the same circumference as the reflecting portion around the rotating portion.
An angle formed by the connecting portion and the rotation axis of the rotating portion may be 70 ° or less.
It should be noted that any combination of the above-described main components and a mode in which the expression form of the present invention is converted between a method, an apparatus, a system, and the like are also effective as a mode of the present invention.
According to the present invention, a rotating reflector with high rotation accuracy can be provided.
Drawings
Fig. 1 is a schematic horizontal cross-sectional view of a vehicle headlamp according to the present embodiment.
Fig. 2 is a front view of the vehicle headlamp of the present embodiment.
Fig. 3 is a perspective view showing a main part of the optical unit of the present embodiment.
Fig. 4 is a perspective view of the rotating reflector of the present embodiment.
Fig. 5 is a front view of the rotating reflector of the present embodiment.
Fig. 6 is a side view of the rotating reflector shown in fig. 5 as viewed from the a direction.
Fig. 7(a) is a B-B sectional view of the rotating reflector shown in fig. 5, fig. 7(B) is a C-C sectional view of the rotating reflector shown in fig. 5, and fig. 7(C) is a D-D sectional view of the rotating reflector shown in fig. 5.
Fig. 8 is a front view of the rotating reflector for explaining the shape of the reflecting surface.
Fig. 9(a) is a schematic diagram of a light source having an arrangement of light emitting elements of a reference example, and fig. 9(b) is a schematic diagram of a light distribution pattern formed by the light source shown in fig. 9 (a).
Fig. 10(a) is a plan view schematically showing the optical unit of the reference example, and fig. 10(b) is a schematic diagram for explaining movement of virtual images of a plurality of LEDs.
Fig. 11(a) is a schematic diagram of a light source having an arrangement of light emitting elements according to the present embodiment, and fig. 11(b) is a schematic diagram of a light distribution pattern formed by the light source shown in fig. 11 (a).
Fig. 12 is a schematic diagram of a light source having an arrangement of light emitting elements of a modification of the present embodiment.
Detailed Description
The present invention will be described below based on embodiments with reference to the drawings. The same or equivalent components, members and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate. The embodiments are merely illustrative and not restrictive, and all the features and combinations of the features described in the embodiments are not necessarily essential to the present invention.
The optical unit having the support member of the present embodiment can be applied to various vehicle lamps. First, an outline of a vehicle headlamp capable of mounting an optical unit according to an embodiment described later will be described.
(vehicle headlight)
Fig. 1 is a schematic horizontal cross-sectional view of a vehicle headlamp according to the present embodiment. Fig. 2 is a front view of the vehicle headlamp of the present embodiment. In fig. 2, some components are omitted.
The vehicle headlamp 10 of the present embodiment has the same configuration as the vehicle headlamp 10 of the present embodiment except that the vehicle headlamp is mounted on the right side of the front end portion of the vehicle and is bilaterally symmetric to the vehicle headlamp mounted on the left side. Therefore, the right vehicle headlamp 10 will be described in detail below, and the left vehicle headlamp will not be described.
As shown in fig. 1, the vehicle headlamp 10 includes a lamp body 12 having a recess that opens forward. The front opening of the lamp body 12 is covered by a transparent front cover 14, thereby forming a lamp chamber 16. The lamp chamber 16 is used as a space for accommodating one optical unit 18. The optical unit 18 is a lamp unit configured to be able to irradiate variable high beam. The variable high beam is controlled so as to change the shape of the light distribution pattern for the high beam, and for example, a non-irradiation region (light shielding portion) can be generated in a part of the light distribution pattern.
The optical unit 18 of the present embodiment includes: a first light source 20; a condensing lens 24 as a primary optical system (optical member) for changing an optical path of the first light L1 emitted from the first light source 20 to direct the light toward the blade 22a of the rotating reflector 22; a rotating reflector 22 that rotates about a rotation axis R while reflecting the first light L1; a convex lens 26 as a projection lens that projects the first light L1 reflected by the rotating reflector 22 in the light irradiation direction (the right direction in fig. 1) of the optical unit; a second light source 28 disposed between the first light source 20 and the convex lens 26; a scattering lens 30 as a primary optical system (optical member) that changes the optical path of the second light L2 emitted from the second light source 28 and directs the second light to the convex lens 26; and a heat sink 32 on which the first light source 20 and the second light source 28 are mounted.
Semiconductor light emitting elements such as LEDs, ELs, and LDs are used for the respective light sources. In the first light source 20 of the present embodiment, the plurality of LEDs 20a are arranged in an array on the circuit board 33. Each LED20a is configured to be individually turned on and off.
The second light source 28 of the present embodiment is configured such that two LEDs 28a are arranged in an array in the horizontal direction, and each LED28a is configured to be individually turned on and off. In addition, the second light source 28 is configured to make the second light L2 incident toward the convex lens 26 without being reflected by the rotating reflector 22. Thus, the optical characteristics of the second light L2 emitted from the second light source 28 can be selected without considering the reflection by the rotating reflector 22. Therefore, for example, by scattering the light emitted from the second light source 28 by the scattering lens 30 and then making the light enter the convex lens 26, a wider range can be irradiated, so that the second light source 28 can be used as a light source for irradiating the vehicle outside area.
The rotating reflector 22 is rotated in one direction about a rotation axis R by a drive source such as a motor 34. Two blades 22a having the same shape as the rotating reflector 22 are provided around the cylindrical rotating portion 22 b. The blade 22a is used as a reflection surface, and is configured to form a desired light distribution pattern by scanning light reflected by light emitted from the first light source 20 while rotating forward.
The rotation axis R of the rotating reflector 22 is disposed in a plane including the optical axis Ax and the first light source 20, obliquely to the optical axis Ax. In other words, the rotation axis R is provided substantially parallel to the scanning plane of the light (irradiation beam) of the LED20a scanned in the left-right direction by the rotation. This enables the optical unit to be thin. Here, the scanning plane may be, for example, a fan-shaped plane formed by continuously connecting the light trajectories of the LEDs 20a as the scanning light.
The shape of the convex lens 26 may be appropriately selected according to the required light distribution characteristics such as the light distribution pattern and the illuminance distribution, but an aspherical lens or a free-form lens may be used. For example, the convex lens 26 of the present embodiment may be formed with a cutout portion 26a in which a part of the outer periphery is cut out in the vertical direction by devising the arrangement of each light source and the rotating reflector 22. Therefore, the size of the optical unit 18 in the vehicle width direction can be suppressed.
Further, the presence of the notch 26a makes it difficult for the blade 22a of the rotating reflector 22 and the convex lens 26 to interfere with each other, and enables the convex lens 26 and the rotating reflector 22 to approach each other. Further, when the vehicle headlamp 10 is viewed from the front, by forming a non-circular (straight) portion on the outer periphery of the convex lens 26, a vehicle headlamp having a novel appearance with a lens having an outer shape combining a curved line and a straight line can be realized when viewed from the front of the vehicle.
(optical unit)
Fig. 3 is a perspective view showing a main part of the optical unit of the present embodiment. In fig. 3, the first light source 20, the rotating reflector 22, and the convex lens 26 are mainly shown among the components constituting the optical unit 18, and some of the components are omitted for convenience of description.
As shown in fig. 3, the optical unit 18 has: a first light source 20 formed of a plurality of LEDs 20a oriented in a horizontal direction and arranged in a linear shape; and a convex lens 26 that projects light reflected by the rotating reflector 22 on the light emitted from the first light source 20 toward the light irradiation direction (optical axis Ax) of the optical unit. The rotating reflector 22 is disposed so that the rotation axis R extends in the horizontal direction while being inclined with respect to the light irradiation direction (optical axis Ax). In addition, the first light source 20 is arranged such that the light emitting surface of each of the plurality of LEDs 20a is inclined with respect to the reflection surface.
The reflecting surface 22d of the blade 22a has a shape twisted so that an angle formed by the optical axis Ax and the reflecting surface changes with the circumferential direction around the rotation axis R. The shape of the reflecting surface will be described in more detail later.
(rotating Reflector)
Next, the configuration of the rotating reflector 22 according to the present embodiment will be described in detail. Fig. 4 is a perspective view of the rotating reflector of the present embodiment. Fig. 5 is a front view of the rotating reflector of the present embodiment. Fig. 6 is a side view of the rotating reflector shown in fig. 5 as viewed from the a direction. Fig. 7(a) is a B-B sectional view of the rotating reflector shown in fig. 5, fig. 7(B) is a C-C sectional view of the rotating reflector shown in fig. 5, and fig. 7(C) is a D-D sectional view of the rotating reflector shown in fig. 5.
The rotating reflector 22 is a resin-made member having a rotating portion 22b and a plurality of (two) blades 22a provided around the rotating portion 22b and functioning as reflecting surfaces. The vanes 22a are arc-shaped, and the outer peripheral portions of adjacent vanes 22a are connected by a connecting portion 22c to form a ring shape. Thus, even if the rotating reflector 22 rotates at a high speed (for example, 50 to 240 rpm), the rotating reflector 22 is hard to bend.
A cylindrical sleeve 36, into which a rotation shaft of the rotating reflector 22 is inserted and fitted, is fixed by insert molding to the center of the rotating portion 22 b. Further, two recesses 40 are formed in the annular groove 38 formed in the outer peripheral portion of the rotating portion 22b and inside the vane 22a as marks corresponding to the gate positions of the mold.
The rotating reflector 22 shown in fig. 4 to 7 is applied to the vehicle headlamp 10 for a right headlamp, and rotates counterclockwise in a front view of the reflection surface 22 d. As shown in fig. 4 to 7, the reflecting surface 22d of the blade 22a is configured such that the axial height of the outer peripheral portion (the thickness direction of the blade) gradually increases counterclockwise in front view. On the other hand, the reflecting surface 22d is configured such that the axial height of the inner peripheral portion close to the rotating portion 22b gradually decreases in the counterclockwise direction.
The reflecting surface 22d is configured such that the end portion 22e having a lower axial height from the outer peripheral portion gradually increases toward the center (the rotating portion 22 b). On the other hand, the reflecting surface 22d is configured such that the end portion 22f having a higher axial height gradually decreases toward the center from the outer peripheral portion.
As described above, the rotating reflector 22 of the present embodiment includes the plurality of blades 22a provided around the rotating portion 22b and spaced apart from each other. As shown in fig. 5 and 7, the blade 22a includes: a reflection surface 22d that reflects light contributing to formation of a light distribution pattern, out of light emitted from the LED20 a; and a connection portion 22h connected to the other separated blade, and configured to prevent light emitted from the LED20a from being reflected in a direction that becomes glare.
As a result, by connecting the adjacent blades 22a by the connecting portions 22h, a decrease in rigidity of the blades 22a can be suppressed. On the other hand, the rotating reflector 22 of the present embodiment is configured not to be reflected in the direction of glare even if the light emitted from the LED20a is reflected by the connecting portion 22h, and thus the occurrence of glare can be suppressed.
Specifically, as shown in fig. 7 c, the reflection surface 22d has a surface shape configured to allow the light L1 contributing to the formation of the light distribution pattern to enter a predetermined optical member (convex lens 26) as the reflected light R1. On the other hand, the connection portion 22h has a surface shape configured such that the light L1 'emitted from the LED20a does not go toward the convex lens 26 as reflected light R1'. Accordingly, even if the light L1' emitted from the LED20a is reflected by the connecting portion 22h, it does not go toward the convex lens 26, and thus glare is less likely to occur.
As shown in fig. 5, the connection portion 22h is provided around the rotation portion 22 b. Thus, for example, when the region reflecting light emitted from the LED20a is the region R3 close to the outer periphery of the blade 22a away from the rotating portion 22b, light of the LED20a that is originally incident on the connecting portion 22h is reduced, and generation of glare is suppressed.
As shown in fig. 5, at least a part 22h1 of the connection portion 22h is arranged on the same circumference as the reflection surface 22d around the rotation portion 22 b.
In addition, the rotating reflector 22 of the present embodiment is set such that the angle α formed by the reflecting surface 22d and the rotation axis R is 90 ° ± α 0 (α 0 In the range of 5 to 10 °) (see fig. 7(b) and 7 (c)). In this case, as shown in fig. 7(c), an angle β formed by the rotation axis R of the connecting portion 22h and the rotating portion 22b may be set to the reflection surface 22d and the rotation axis RThe angle α formed by R is not repeated, and is, for example, 70 ° or less, preferably 60 ° or less, and more preferably 50 ° or less.
The connecting portion 22h may be a corrugated surface. The surface of the portion corresponding to the connecting portion 22h of the resin-molded rotary reflector 22 is made rougher than the surface of the portion corresponding to the reflecting surface 22d by metal vapor deposition to form a wrinkled surface.
Normally, although the direct light from the LED20a is configured not to be directed toward the projection lens 26 due to the design of the reflection surface even when it is incident on the connection portion 22h, there is a possibility that glare may occur because the reflection direction cannot be completely controlled when a part of the light reflected inside the optical unit is incident on the connection portion. Even when such unexpected light enters the connection portion 22h, if the surface of the connection portion 22h is corrugated, the light intensity of the reflected light can be reduced, and the influence of glare can be reduced even when the light enters the projection lens.
The normal vector of the reflecting surface 22d having different inclinations in each portion will be described. Fig. 8 is a front view of the rotating reflector for explaining the shape of the reflecting surface. The imaginary line L3 shown in fig. 8 connects the portions of the reflection surfaces 22d having substantially constant axial heights, and only the point F on the imaginary line L3 0 The normal vector of the reflecting surface 22d is parallel to the rotation axis of the rotating reflector 22.
Each arrow shown in fig. 8 indicates a tilt direction in the region thereof, and the direction of the arrow indicates a direction from the higher side to the lower side of the height of the reflection surface 22 d. As shown in fig. 8, the reflecting surface 22d of the present embodiment is reversed in the inclination direction in the circumferential direction or the radial direction in the adjacent region with the broken line L3 interposed therebetween. For example, light incident on the region R1 from the front surface of the reflection surface 22d is reflected obliquely upward to the left in the state shown in fig. 8. Similarly, light incident on the region R2 is reflected obliquely left downward, light incident on the region R3 is reflected obliquely right upward, and light incident on the region R4 is reflected obliquely right downward.
Since the reflecting surface 22d of the rotating reflector 22 is configured to change the reflecting direction of the incident light according to the region, the reflecting direction of the incident light changes periodically by rotating the rotating reflector 22. By utilizing this property, the rotating reflector 22 scans the light reflected by the light emitted from the first light source 20 forward while rotating, thereby forming a light distribution pattern.
However, when the light emitted from the plurality of LEDs 20a arranged in a linear shape shown in fig. 1 and 3 is reflected while being rotated by using the rotating reflector 22 having the reflecting surface 22d and the light is scanned forward by the reflected light, a desired light distribution pattern may not be obtained.
Fig. 9(a) is a schematic diagram of a light source having an arrangement of light emitting elements of a reference example, and fig. 9(b) is a schematic diagram of a light distribution pattern formed by the light source shown in fig. 9 (a). As shown in fig. 9(a), the three LEDs 20a1, 20a2, 20a3 of the light source of the reference example are arranged on a straight line parallel to the optical axis Ax. In this case, the partial light distribution patterns PH1 to PH3 formed by the light emitted from the LEDs 20a1, 20a2, and 20a3 overlap while being obliquely offset from each other. As a result, the maximum luminous intensity of the light distribution pattern PH does not increase.
The reason why such a partial light distribution pattern is not horizontal but is deviated obliquely will be described. Fig. 10(a) is a plan view schematically showing the optical unit of the reference example, and fig. 10(b) is a schematic diagram for explaining movement of virtual images of a plurality of LEDs. The virtual image shown in fig. 10(b) shows the front arrangement as viewed from the front of the vehicle. In the following, for the sake of simplifying the description, a case where three LEDs are provided is assumed. The respective configurations are designed assuming a case of the vehicle headlamp 10 as a right headlamp.
First, a partial light distribution pattern PH2 formed by light emitted from the LED20a2 positioned at the center (the second from the front side of the vehicle) among the three LEDs will be described. The light emitted from the LED20a2 is reflected by the central region R of the left side reflection region of the rotating reflector 22 shown in FIG. 8 c And (4) reflection. Specifically, when the blade 22a rotates and sequentially passes through the rotation positions P1, P2, and P3 on the front surface of the light emitting surface of the LED20a2, the real image I2 is projected on the reflection surface 22 d. In this case, as shown in fig. 10(a), the secondary light source (virtual image position based on the rotating reflector) is a virtual image I2' located at a position that is a mirror image of the reflecting surface 22 d. In addition, the virtual image I2' is on the convex lens 26The vicinity of the focal point f moves left and right. Thereby, as shown in fig. 10(b), a scanning pattern P 'H2 based on the virtual image I2' is formed. Then, the scanning pattern P' H2 formed near the focal point f of the convex lens 26 is projected forward of the vehicle, thereby forming a partial light distribution pattern PH2 shown in fig. 9 (b).
In addition, the light emitted from the LED20a1 positioned on the vehicle foremost side is reflected by the inner region R of the reflection region on the left side of the rotating reflector 22 shown in fig. 8 in And (4) reflecting. Specifically, when the blade 22a sequentially passes through the rotation positions P1, P2, and P3 while rotating, the real image I1 is projected on the front surface of the light emitting surface of the LED20a1 on the reflection surface 22 d. In this case, as shown in fig. 10(a), the secondary light source is a virtual image I1' located at a position that is a mirror image of the reflection surface 22 d. In addition, the virtual image I1' moves left and right near the focal point f of the convex lens 26. However, the inner region R of the reflection surface 22d in Is a surface always inclined downward. Therefore, the virtual image I1 'moves left and right at a position above the virtual image I2'. Thereby, as shown in fig. 10(b), a scanning pattern P 'H1 based on the virtual image I1' is formed. Then, the scanning pattern P' H1 formed near the focal point f of the convex lens 26 is projected forward of the vehicle, thereby forming a partial light distribution pattern PH1 shown in fig. 9 (b).
In addition, the light emitted from the LED20a3 located on the rearmost side of the vehicle is emitted from the outer region R of the reflection region on the left side of the rotating reflector 22 shown in fig. 8 out And (4) reflecting. Specifically, when the blade 22a sequentially passes through the rotation positions P1, P2, and P3 while rotating, the real image I3 is projected on the front surface of the light emitting surface of the LED20a3 on the reflection surface 22 d. In this case, as shown in fig. 10(a), the secondary light source is a virtual image I3' located at a position that is a mirror image of the reflection surface 22 d. In addition, the virtual image I3' moves left and right near the focal point f of the convex lens 26. However, the outer region R of the reflection surface 22d out The surface is always inclined upward. Therefore, the virtual image I3 'moves left and right at a position lower than the virtual image I2'. Thereby, as shown in fig. 10(b), a scanning pattern P 'H3 based on the virtual image I3' is formed. Then, the scanning pattern P' H3 formed near the focal point f of the convex lens 26 is projected forward of the vehicle, thereby forming a partial light distribution pattern PH3 shown in fig. 9 (b).
As described above, according to the rotating reflector 22 of the present embodiment, even when the three LEDs 20a1, 20a2, and 20a3 are aligned in a horizontal direction, it is clear that when the inclination angle of the reflection surface changes depending on the position, part of the light distribution pattern is not aligned in a straight line. Therefore, the inventors of the present application have conceived of obtaining a desired light distribution pattern by adjusting the position of the light emitting element in accordance with the shape of the reflection surface of the rotating reflector.
Fig. 11(a) is a schematic diagram of a light source having an arrangement of light emitting elements according to the present embodiment, and fig. 11(b) is a schematic diagram of a light distribution pattern formed by the light source shown in fig. 11 (a).
The rotating reflector 22 of the present embodiment has a reflecting surface 22d that is twisted so that a desired light distribution pattern is formed by scanning the light of the first light source 20 reflected while rotating in the front direction. As shown in fig. 11(a), the LEDs 20a1, 20a2, 20a3 as the plurality of light-emitting elements of the present embodiment are arranged so as to emit light from the inner region R of the reflection surface 22d in The vertical position of the LED20a1 as the inner light emitting element for the reflected light is located at a position closer to the outer region R as the reflection surface 22d out The vertical position of the LED20a3 of the outer light emitting element of the reflected light is located lower.
According to this embodiment, the vertical positions of some of the LEDs 20a1, 20a3 are adjusted in consideration of the variation in the image of the first light source 20 reflected by the uneven and distorted reflecting surface 22d of the rotating reflector 22. Thus, as shown in fig. 11(b), the partial light distribution patterns PH1 to PH3 are superimposed at positions where vertical displacement is suppressed, whereby a rectangular light distribution pattern PH having no step can be formed.
The LEDs 20a1, 20a2, and 20a3 are arranged in a linear shape in the horizontal direction so that the overlap of partial light distribution patterns PH1 to PH3 formed by forward scanning of the lights emitted from the plurality of LEDs 20a1, 20a2, and 20a3 reflected by the rotating reflector 22 is increased as compared with the case where the lights are arranged in a straight line in the horizontal direction.
This increases the overlap of the partial light distribution patterns PH1 to PH3, and a bright light distribution pattern PH can be obtained. Here, the line shape does not necessarily mean that all the LEDs are arranged on a straight line, and the vertical positions of the plurality of LEDs may be gradually (stepwise) changed. In addition, the vertical positions of a part of the plurality of elements may be the same.
Fig. 12 is a schematic diagram of a light source having an arrangement of light emitting elements of a modification of the present embodiment. The light source of the modified example has a plurality of LEDs 20a 1-20 a5 in order from one end of the front side of the vehicle. The first to fifth LEDs are displaced downward from the reference vertical positions by a displacement d 1 ～d 5 Satisfies the following formula (1).
d 1 ≤d 2 ≤d 3 ≤…≤d n-1 ≤d n (1)
(wherein n is an integer of 2 or more, d 1 ＝d 2 ＝d 3 …＝d n-1 ＝d n Except for the case of
Or a downward displacement d from a reference vertical position 1 ～d 5 The following formula (2) may be satisfied.
d 1 <d 2 <d 3 <…<d n-1 <d n (2)
The reflecting surface 22d of the rotating reflector 22 of the present embodiment is located in the outer region R of the region where the light from the light source is reflected out Always has an upward inclined surface, and the inner region R in Always a surface inclined downward. However, the shape of the reflecting surface is not limited thereto, and is in the inner region R of the reflecting surface in Is a plane always inclined upward and the outer region R out In the case of a surface that is always inclined downward, the LEDs 20a1 to 20a3 shown in fig. 11(a) may be arranged such that the vertical position of the LED20a1 that emits light reflected by the inner side of the reflecting surface 22d is located above the vertical position of the LED20a3 that emits light reflected by the outer side of the reflecting surface 22 d.
When the above-described situation is further developed, a desired light distribution pattern can be obtained by adjusting the relative positional relationship of the plurality of light emitting elements based on the difference in direction of the normal vector of the reflection surface and the periodic change in each reflection region of the rotating reflector on which light emitted from the plurality of light emitting elements of the light source is projected.
Although the present invention has been described above with reference to the above embodiments, the present invention is not limited to the above embodiments, and embodiments in which the structures of the embodiments are appropriately combined and replaced are also included in the present invention. Further, based on the knowledge of those skilled in the art, it is possible to appropriately change the combination of the embodiments and the order of processing, or add various modifications such as design changes to the embodiments, and the embodiments to which the modifications are added are also included in the scope of the present invention.
Description of the reference numerals
10 a vehicle headlamp;
18 an optical unit;
20 a first light source;
20a LED；
22a rotating reflector;
22a blades;
22b a rotating part;
22c a connecting part;
22d a reflective surface;
a 22h connection part;
26 convex lenses;
33 a circuit board.

Claims (5)

1. A vehicle lamp having an optical unit, characterized in that,
the optical unit has:
a rotating reflector which rotates in one direction around a rotating shaft while reflecting light emitted from a light source;
a light source including a plurality of light emitting elements arranged in a line in a horizontal direction;
a condensing lens that changes an optical path of light emitted from the light source and directs the light toward the rotating reflector;
The rotating reflector has a reflecting surface twisted so that light from the light source reflected while rotating scans the front to form a desired light distribution pattern,
the plurality of light emitting elements are arranged such that the upper and lower positions of the inner light emitting element that emits light reflected by the inner side of the reflecting surface are located below the upper and lower positions of the outer light emitting element that emits light reflected by the outer side of the reflecting surface.
2. A lamp for a vehicle as defined in claim 1,
the plurality of light emitting elements are arranged in a linear shape in the horizontal direction such that overlap of partial light distribution patterns formed by scanning light emitted from the plurality of light emitting elements reflected by the rotating reflector in front of each other is increased as compared with a case where the light emitting elements are arranged in a straight line in the horizontal direction.
3. The vehicular lamp according to claim 1 or 2,
the plurality of light emitting elements have first to nth light emitting elements in this order from one end,
a downward displacement d of the first to n-th light emitting elements from a reference upper and lower position 1 ～d n Satisfies the following formula (1),
d 1 ≤d 2 ≤d 3 ≤…≤d n-1 ≤d n (1)
wherein d is 1 ＝d 2 ＝d 3 …＝d n-1 ＝d n Except for the case (1).
4. The vehicular lamp according to claim 1 or 2,
Further comprising a projection lens for projecting the light reflected by the rotating reflector toward a light irradiation direction of the optical unit,
the rotating reflector is configured such that a rotation axis is inclined with respect to the light irradiation direction and extends in a horizontal direction,
the light source is configured such that each light emitting surface of the plurality of light emitting elements is inclined with respect to the reflection surface.
5. The vehicular lamp according to claim 1 or 2,
the reflecting surface has a shape twisted so that an angle formed by the optical axis and the reflecting surface changes with the direction of the circumferential direction around the rotation axis.
CN201910982174.5A 2018-10-19 2019-10-16 Vehicle lamp and rotating reflector Active CN111076138B (en)

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WO2020080410A1 (en) * 2018-10-19 2020-04-23 株式会社小糸製作所 Rotating reflector manufacturing method and rotating reflector
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JP6796993B2 (en) 2016-10-24 2020-12-09 株式会社小糸製作所 Optical unit
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JP2018156776A (en) * 2017-03-16 2018-10-04 株式会社小糸製作所 Optical unit
CN210860951U (en) * 2018-10-19 2020-06-26 株式会社小糸制作所 Vehicle lamp

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