CN108375029B - Optical unit - Google Patents
Optical unit Download PDFInfo
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- CN108375029B CN108375029B CN201710833077.0A CN201710833077A CN108375029B CN 108375029 B CN108375029 B CN 108375029B CN 201710833077 A CN201710833077 A CN 201710833077A CN 108375029 B CN108375029 B CN 108375029B
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- light
- light source
- optical unit
- rotating mirror
- projection lens
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
- F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
- F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- 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
- F21S41/18—Combination of light sources of different types or shapes
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/20—Electroluminescent [EL] light sources
Abstract
Provided is a novel optical unit capable of irradiating a wide range with a simple structure. The optical unit (40) has: a 1 st light source (42); a 2 nd light source (48); a rotating mirror (44) that rotates about a rotation axis while reflecting the 1 st light (L1) emitted from the 1 st light source (42); and a projection lens (46) that projects the 1 st light (L1) reflected by the rotating mirror in the light irradiation direction of the optical unit. The 2 nd light source (48) is disposed so that the emitted 2 nd light (L2) enters the projection lens (46) without being reflected by the rotating mirror (44), and the projection lens (46) projects the 2 nd light (L2) in the light irradiation direction of the optical unit.
Description
Technical Field
The present invention relates to an optical unit, and particularly to an optical unit used in a vehicle lamp.
Background
In recent years, there has been designed a device that reflects light emitted from a light source toward the front of a vehicle and scans an area in front of the vehicle with the reflected light to form a predetermined light distribution pattern. For example, an optical unit is known (see patent document 1) which includes: a rotating mirror that rotates in one direction about a rotation axis while reflecting light emitted from a light source; and a plurality of light sources each including a light emitting element, wherein the rotating reflector is provided with a reflecting surface so that light of the light source reflected while rotating forms a desired light distribution pattern, and the plurality of light sources are arranged such that light emitted from each light source is reflected at different positions on the reflecting surface.
Patent document 1: japanese laid-open patent publication No. 2015-26628
However, if an attempt is made to scan a wide range with light reflected by the rotating mirror, a decrease in maximum luminous intensity and deterioration in image formability tend to occur. Therefore, the optical unit is provided with a diffusion LED unit for diffusing light for irradiating a wide range, in addition to a light-condensing LED unit for realizing strong light-condensing toward the front in the traveling direction. Further, the light emitted from the light-collecting LED unit is reflected at the 1 st position of the rotating mirror and projected forward through the 1 st projection lens, and the light emitted from the light-diffusing LED unit is reflected at the 2 nd position of the rotating mirror and projected forward through the 2 nd projection lens. Therefore, a plurality of projection lenses are required, and the entire unit tends to be large.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel optical unit capable of irradiating a wide range with a simple configuration.
In order to solve the above problem, an optical unit according to an aspect of the present invention includes: 1 st light source; a 2 nd light source; a rotating mirror which rotates around a rotation axis while reflecting the 1 st light emitted from the 1 st light source; and a projection lens that projects the 1 st light reflected by the rotating mirror toward a light irradiation direction of the optical unit. The 2 nd light source is disposed so that the emitted 2 nd light enters the projection lens without being reflected by the rotating mirror, and the projection lens projects the 2 nd light in the light irradiation direction of the optical unit.
According to this aspect, since the 2 nd light emitted from the 2 nd light source is incident on the projection lens without being reflected by the rotating mirror, the optical characteristics can be selected without considering the reflection by the rotating mirror. Therefore, for example, by using the 2 nd light source having a wider angle of view than the 1 st light source, a wider range can be illuminated.
The 2 nd light source may be disposed between the substrate on which the 1 st light source is mounted and the rotating mirror when viewed from the front of the vehicle. Thereby, the 2 nd light source can be arranged without widening the width of the optical unit.
The projection lens may be configured to project the 1 st light beam reflected by the rotating mirror and incident thereon in the light irradiation direction of the optical unit as a condensed light distribution pattern, and to project the 2 nd light beam incident on the rotating mirror but not reflected thereon in the light irradiation direction of the optical unit as a diffused light distribution pattern. This makes it possible to irradiate a wide range without substantially reducing the light intensity of the light distribution pattern.
Another embodiment of the present invention is also an optical unit. The optical unit has: 1 st light source; a rotating mirror which rotates around a rotation axis while reflecting the 1 st light emitted from the 1 st light source; a projection lens for projecting the 1 st light reflected by the rotating mirror toward the light irradiation direction of the optical unit; a 2 nd light source disposed between the 1 st light source and the projection lens; and an optical member that changes an optical path of the 2 nd light emitted from the 2 nd light source and directs the 2 nd light toward the projection lens. The 2 nd light source is configured such that the emitted 2 nd light is incident on the projection lens without being reflected by the rotating mirror.
According to this aspect, since the 2 nd light emitted from the 2 nd light source is incident on the projection lens without being reflected by the rotating mirror, the optical characteristics can be selected without considering the reflection by the rotating mirror. Therefore, for example, by using the 2 nd light source having a wider angle of view than the 1 st light source, a wider range can be illuminated. Further, by changing the optical path of the 2 nd light by the optical member and directing the light toward the projection lens, the position where the 2 nd light source is disposed can be adjusted, and the degree of freedom in designing the members constituting the optical unit is increased.
The projection lens may be configured to project the 1 st light beam incident after being reflected by the rotating mirror in the light irradiation direction of the optical unit as a condensed light distribution pattern, and project the 2 nd light beam incident without being reflected by the rotating mirror in the light irradiation direction of the optical unit as a diffused light distribution pattern. This makes it possible to irradiate a wide range without substantially reducing the light intensity of the light distribution pattern.
The 2 nd light source may have a plurality of light emitting elements arranged in an array. This makes it possible to change the irradiation range stepwise.
Another embodiment of the present invention is also an optical unit. The optical unit has: 1 st light source; a rotating mirror which rotates around a rotation axis while reflecting the 1 st light emitted from the 1 st light source; a projection lens for projecting the 1 st light reflected by the rotating mirror toward the light irradiation direction of the optical unit; a 2 nd light source disposed between the 1 st light source and the projection lens; and an optical member that reflects the 2 nd light emitted from the 2 nd light source toward the projection lens. The 2 nd light source is configured such that the emitted 2 nd light is incident on the projection lens without being reflected by the rotating mirror.
According to this aspect, since the 2 nd light emitted from the 2 nd light source is incident on the projection lens without being reflected by the rotating mirror, the optical characteristics can be selected without considering the reflection by the rotating mirror. Therefore, for example, by using the 2 nd light source having a wider angle of view than the 1 st light source, a wider range can be illuminated.
Another embodiment of the present invention is also an optical unit. The optical unit has: a light source; and a rotating mirror that rotates about a rotation axis while reflecting light emitted from the light source. The rotating reflector is provided with a reflecting surface so that a predetermined light distribution pattern is formed by scanning the front with light reflected while rotating, and the light source includes: a 1 st light emitting unit that emits 1 st light for scanning a 1 st region including a maximum luminous intensity region in the light distribution pattern; and a 2 nd light emitting unit that emits a 2 nd light for scanning a 2 nd region adjacent to the 1 st region. L1 > L2 are satisfied if L1 represents the total length of the 1 st light-emitting part in the longitudinal direction and L2 represents the total length of the 2 nd light-emitting part in the direction parallel to the longitudinal direction of the 1 st light-emitting part.
According to this aspect, since the 1 st light-emitting unit that scans the 1 st region including the maximum luminous intensity region is provided, and the 2 nd light-emitting unit that scans the 2 nd region adjacent to the 1 st region is provided, it is possible to realize irradiation in a wider range while satisfying the maximum luminous intensity.
N1 > N2 are satisfied if the number of light-emitting elements constituting the 1 st light-emitting part is N1 and the number of light-emitting elements constituting the 2 nd light-emitting part is N2. Thus, the number of light emitting elements can be reduced in the 2 nd light emitting unit that emits the 2 nd light scanning the 2 nd region not including the maximum luminous intensity region.
The area of the 2 nd light emitting part is smaller than that of the 1 st light emitting part. This can suppress the number of light-emitting elements constituting the 2 nd light-emitting unit compared to the 1 st light-emitting unit, for example.
The 2 nd light emitting part may have a plurality of light emitting regions separately provided with a non-light emitting region therebetween. This enables irradiation of a wide range without increasing the size of the 2 nd light-emitting part.
The plurality of light emitting regions may be provided adjacent to both ends in the longitudinal direction of the 1 st light emitting part. This allows the 2 nd light emitting unit to irradiate a region having the same width as the 1 st light emitting unit.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a new optical unit capable of irradiating a wide range can be realized with a simple configuration.
Drawings
Fig. 1 is a horizontal sectional view of a vehicle headlamp.
Fig. 2 is a plan view schematically showing the structure of an optical unit according to a reference example.
Fig. 3 is a side view of an optical unit according to a reference example.
Fig. 4 is a schematic view of the optical unit according to embodiment 1 as viewed from above.
Fig. 5 is a schematic view of the optical unit shown in fig. 4 viewed from the side.
Fig. 6 is a schematic view of the optical unit shown in fig. 4 as viewed from the front.
Fig. 7(a) is a schematic diagram of a main part of the 1 st light source according to the present embodiment in an enlarged manner, and fig. 7(b) is a schematic diagram of a main part of the light emitting module according to the present embodiment in an enlarged manner.
Fig. 8 is a diagram schematically showing a light distribution pattern formed by a vehicle headlamp having an optical unit according to embodiment 1.
Fig. 9 is a schematic view of the optical unit according to embodiment 2 as viewed from above.
Fig. 10 is a schematic view of the optical unit shown in fig. 9 viewed from the side.
Fig. 11 is a schematic view of the optical unit shown in fig. 9 as viewed from the front.
Fig. 12 is a schematic view of the optical unit according to embodiment 3 as viewed from above.
Fig. 13 is a schematic view of the optical unit shown in fig. 12 as viewed from the side.
Fig. 14 is a schematic view of the optical unit shown in fig. 12 as viewed from the front.
Fig. 15 is a horizontal sectional view of the vehicle headlamp according to embodiment 4.
Fig. 16 is a front view of the vehicle headlamp according to embodiment 4.
Fig. 17 is a plan view of the 1 st light source according to the present embodiment.
Fig. 18 is a view schematically showing a positional relationship between a plurality of light emitting modules mounted on the 1 st light source.
Fig. 19 is a diagram showing a pattern P in which a light source image is reflected by a rotating mirror in a stationary state and projected forward in a state where all the 1 st light sources are lit.
Fig. 20 is a diagram schematically showing a light distribution pattern formed by a vehicle headlamp having an optical unit according to embodiment 4.
Fig. 21(a) to 21(c) are views showing modifications of the light distribution pattern for high beam realized by the 1 st light source according to the present embodiment.
Description of the reference numerals
L1 1 st light, L2 nd light, 10 head lamp for vehicle, 20 lamp unit, 26 rotating reflector, 40 optical unit, 42 1 st light source, 44 rotating reflector, 46 projection lens, 48 nd light source, 2 nd light source, 50 inner lens, 52 radiator, 53, 54 light emitting module, 55 circuit substrate, 57LED, 60 optical unit, 62 radiator, 66 fixed reflector, 80 optical unit.
Detailed Description
The present invention will be described below with reference to the accompanying drawings based on embodiments. The same or equivalent components, members and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. The embodiments are not intended to limit the invention, but to exemplify, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention.
The optical unit of the present invention can be used in various vehicle lamps. First, a vehicle headlamp capable of mounting an optical unit according to each embodiment described later will be described in outline.
[ vehicle headlamp ]
Fig. 1 is a horizontal sectional view of a vehicle headlamp. Fig. 2 is a plan view schematically showing the structure of an optical unit according to a reference example. Fig. 3 is a side view of an optical unit according to a reference example.
The vehicle headlamp 10 shown in fig. 1 is a right headlamp mounted on the right side of the front end of an automobile, and has the same structure as the headlamp mounted on the left side except that the headlamp is bilaterally symmetrical. 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, and the lamp body 12 has a recess that opens toward the front. The front surface opening of the lamp body 12 is covered with a transparent front cover 14 to form a lamp chamber 16. The lamp house 16 functions as a space for accommodating the 2 lamp units 18 and 20 arranged in the vehicle width direction.
Among these lamp units, the lamp unit 20 disposed on the upper side shown in fig. 1 in the vehicle headlamp 10 on the outer side, that is, on the right side, is a lamp unit having a lens and is configured to emit variable high beam. On the other hand, the lamp unit 18 disposed on the lower side in fig. 1 of the vehicle headlamp 10 on the inner side, i.e., on the right side, among the lamp units, is configured to emit low beam.
The low beam lamp unit 18 includes a reflector 22, a light source bulb (incandescent bulb) 24 supported by the reflector 22, and a shade (not shown), and the reflector 22 is supported by a known unit (not shown), for example, a unit using a calibration screw and a nut, so as to be freely tiltable with respect to the lamp body 12.
The lamp unit 20 is an optical unit having: a rotating mirror 26; an LED 28; and a convex lens 30 as a projection lens disposed in front of the rotating mirror 26. Instead of the LED 28, a semiconductor light emitting element such as an EL element or an LD element may be used as a light source. In particular, in the control for blocking a part of the light distribution pattern described later, a light source that can be turned on/off in a short time and with high accuracy is preferable. The shape of the convex lens 30 may be appropriately selected according to the required light distribution characteristics such as the light distribution pattern and the illuminance distribution, and an aspherical lens or a free-form surface lens may be used.
The rotating mirror 26 is rotated in one direction about the rotation axis R by a drive source such as a motor not shown. The rotating reflector 26 has a reflecting surface configured to reflect light emitted from the LED 28 while rotating, thereby forming a desired light distribution pattern.
The rotary mirror 26 is provided with 2 reflection sheets 26a having the same shape and functioning as reflection surfaces around a cylindrical rotating portion 26 b. The rotation axis R of the rotating mirror 26 is inclined with respect to the optical axis Ax and is disposed in a plane including the optical axis Ax and the LED 28. In other words, the rotation axis R is disposed substantially parallel to a scanning plane of the light (irradiation beam) of the LED 28 scanned in the left-right direction by the rotation. Thus, the optical unit is thinned. Here, the scanning plane may be, for example, a fan-shaped plane formed by continuously connecting the light trajectories of the LEDs 28 as the scanning light. In the lamp unit 20 according to the present embodiment, the LEDs 28 are relatively small, and the positions where the LEDs 28 are arranged are also offset from the optical axis Ax between the rotating reflector 26 and the convex lens 30. Therefore, the depth direction (vehicle front-rear direction) of the vehicle headlamp 10 can be shortened as compared with a case where the light source, the reflector, and the lens are arranged in a line on the optical axis as in the conventional lamp unit of the projection type.
The reflector 26a of the rotating reflector 26 is configured such that the 2 nd order light source of the LED 28 by reflection is formed in the vicinity of the focal point of the convex lens 30. The reflection sheet 26a has a twisted shape such that the angle formed by the optical axis Ax and the reflection surface changes as the sheet faces the circumferential direction around the rotation axis R. Thereby, as shown in fig. 3, scanning using light of the LED 28 can be realized.
(embodiment 1)
In the scanning optical system using the rotating mirror 26, if the diffusion (scanning) range is expanded, a decrease in maximum luminous intensity, deterioration in imaging performance, and the like may occur. Therefore, the actually used scanning range is about ± 10 ° with respect to the optical axis (central axis). Since the lamp unit 20 described above forms a light distribution pattern for high beam using 1 light source, there is a limit to widening the scanning range. Therefore, in the optical unit according to each of the following embodiments, a plurality of light sources are provided in order to increase the irradiation of the high beam light distribution pattern.
Fig. 4 is a schematic view of the optical unit 40 according to embodiment 1 as viewed from above. Fig. 5 is a schematic view of the optical unit 40 shown in fig. 4 as viewed from the side. Fig. 6 is a schematic view of the optical unit 40 shown in fig. 4 as viewed from the front.
The optical unit 40 according to the present embodiment includes: the 1 st light source 42; a rotating mirror 44 that rotates about a rotation axis R while reflecting the 1 st light L1 emitted from the 1 st light source 42; a projection lens 46 that projects the 1 st light L1 reflected by the rotating mirror 44 in the light irradiation direction (right direction in fig. 4) of the optical unit; a 2 nd light source 48 disposed between the 1 st light source 42 and the projection lens 46; an inner lens 50 as an optical member that changes the optical path of the 2 nd light L2 emitted from the 2 nd light source 48 and directs the light toward the projection lens 46; and a heat sink 52 on which the 1 st light source 42 and the 2 nd light source 48 are mounted.
The light emitting modules of the 1 st light source 42 are arranged in an array. Specifically, 8 light emitting modules 54 are arranged in 3 layers, 4 light emitting modules 54 are arranged in the upper layer, 2 light emitting modules 54 are arranged in the middle layer, and 2 light emitting modules 54 are arranged in the lower layer. The middle 2 light emitting modules 54 are disposed adjacent to the lower side of the light emitting modules 54 at both ends among the upper 4 light emitting modules 54, and the lower 2 light emitting modules 54 are disposed adjacent to the lower side of the middle 2 light emitting modules 54.
Fig. 7(a) is a schematic diagram of a main part of the 1 st light source according to the present embodiment in an enlarged manner, and fig. 7(b) is a schematic diagram of a main part of the light emitting module according to the present embodiment in an enlarged manner.
As shown in fig. 7(a), a small mirror 56 is disposed on the light-emitting surface 54a side of each light-emitting module 54, and an opening 56a of the small mirror 56 corresponding to each light-emitting surface 54a is formed in a lattice shape. Thus, the light emitted from the light emitting module 54 reaches the reflecting surface of the rotating mirror 44 without being substantially diffused.
As shown in fig. 7(b), the light-emitting module 54 includes: a rectangular LED 57 mounted on the circuit board 55; an optical wavelength conversion member 58 mounted on the light emitting surface of the LED 57; and a frame 59 provided to surround the outer peripheries of the LEDs 57 and the optical wavelength conversion member 58. The LED 57 is, for example, a semiconductor light emitting element that emits blue light. The light wavelength conversion member 58 is, for example, a YAG ceramic that emits yellow light or a member in which YAG powder is dispersed in a resin. The frame 59 is a white resin in which white powder is dispersed, and reflects light emitted from the side surfaces of the LED 57 and the light wavelength conversion member 58.
The 2 nd light source 48 is arranged such that 2 light emitting modules 53 are arranged in an array in the horizontal direction, and each light emitting module 53 is configured to be able to be independently turned on/off. The specific structure of the light emitting module 53 is the same as that of the light emitting module 54.
The 2 nd light source 48 according to the present embodiment is arranged such that the 2 nd light L2 enters the projection lens 46 without being reflected by the rotating mirror 44. This allows the optical characteristics to be selected without considering that the 2 nd light L2 emitted from the 2 nd light source 48 is reflected by the rotating mirror 44. Therefore, by using, for example, the 2 nd light source 48 having a wider angle of view than the 1 st light source 42, a wider range can be illuminated. Here, the viewing angle is an index indicating the emission angle of light with the position where the emission intensity is half of the peak value as both ends.
Further, the position where the 2 nd light source 48 is disposed can be adjusted by changing the optical path of the 2 nd light L2 by the inner lens 50 and directing it toward the rotating mirror 44. For example, in the optical unit 40 according to the present embodiment, if the inner lens 50 is not provided, the 2 nd light source 48 that is suitable for the projection lens 46 is located behind the heat sink 52, which makes the design difficult. However, by disposing a member that changes the optical path of light, such as the inner lens 50, between the 2 nd light source 48 and the projection lens 46, the 2 nd light L2 emitted from the 2 nd light source 48 appears to reach the projection lens 46 from behind the heat sink 52, and therefore, the degree of freedom in designing the components constituting the optical unit 40, such as the 2 nd light source 48, is increased.
Fig. 8 is a diagram schematically showing a light distribution pattern formed by a vehicle headlamp having an optical unit according to embodiment 1. The light distribution pattern PH for high beam shown in fig. 8 is obtained by combining a condensed light distribution pattern PH1 and a diffused light distribution pattern PH 2. The condensed light distribution pattern PH1 is formed by projecting the 1 st light L1 reflected by the rotating mirror 44 and incident on the projection lens 46 as the light source image X of the 1 st light source 42 and scanning the light in the horizontal direction. On the other hand, the diffused light distribution pattern PH2 is formed by projecting the 2 nd light L2 that is incident on the projection lens 46 and is not reflected by the rotating mirror 44 in the light irradiation direction of the optical unit 40. The diffused light distribution pattern PH2 illuminates a region on the right side of the right end portion of the condensed light distribution pattern PH 1. This allows a wider range to be irradiated with a simple configuration, with almost no decrease in the maximum luminous intensity of the high beam light distribution pattern PH.
The 2 nd light source 48 includes a plurality of light emitting modules 53 arranged in an array, and is configured to be capable of independently dimming each light emitting module 53. This can enlarge the irradiation range in a stepwise manner.
(embodiment 2)
Fig. 9 is a schematic view of the optical unit 60 according to embodiment 2 as viewed from above. Fig. 10 is a schematic diagram of the optical unit 60 shown in fig. 9 viewed from the side. Fig. 11 is a schematic view of the optical unit 60 shown in fig. 9 as viewed from the front. Note that the same components as those of the optical unit according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted as appropriate.
The optical unit 60 according to embodiment 2 includes: the 1 st light source 42; a 2 nd light source 48; a rotating mirror 44 that rotates about a rotation axis R while reflecting the 1 st light L1 emitted from the 1 st light source 42; a projection lens 46 that projects the 1 st light L1 reflected by the rotating mirror 44 in the light irradiation direction of the optical unit 60; and a heat sink 62 for mounting the 1 st light source 42 and the 2 nd light source 48. The 2 nd light source 48 is arranged such that the emitted 2 nd light L2 is directly incident on the projection lens 46 without being reflected by the rotating mirror 44, and the projection lens 46 projects the 2 nd light L2 in the light irradiation direction of the optical unit 60.
This allows the optical characteristics to be selected without considering that the 2 nd light L2 emitted from the 2 nd light source 48 is reflected by the rotating mirror 44. Therefore, by using the 2 nd light source 48 having a wider viewing angle than the 1 st light source 42, a wider range can be illuminated with a simple configuration.
The 2 nd light source 48 is disposed between the circuit board 55 on which the 1 st light source 42 is mounted and the rotating mirror 44 when viewed from the front of the vehicle as shown in fig. 11. This enables the 2 nd light source 48 to be disposed without increasing the width of the optical unit 60. In addition, the optical unit 60 according to the present embodiment can form the light distribution pattern PH for high beam shown in fig. 8, similarly to the optical unit 40 according to embodiment 1.
(embodiment 3)
Fig. 12 is a schematic view of the optical unit 80 according to embodiment 3 as viewed from above. Fig. 13 is a schematic diagram of the optical unit 80 shown in fig. 12 as viewed from the side. Fig. 14 is a schematic view of the optical unit 80 shown in fig. 12 as viewed from the front. Note that the same components as those of the optical unit according to embodiment 1 and embodiment 2 are denoted by the same reference numerals, and description thereof is omitted as appropriate.
The optical unit 80 according to embodiment 3 includes: the 1 st light source 42; a rotating mirror 44 that rotates about a rotation axis while reflecting the 1 st light L1 emitted from the 1 st light source 42; a projection lens 46 that projects the 1 st light L1 reflected by the rotating mirror 44 in the light irradiation direction of the optical unit 80; a 2 nd light source 48 disposed between the 1 st light source 42 and the projection lens 46; and a fixed mirror 66 as an optical member that reflects the 2 nd light L2 emitted from the 2 nd light source 48 toward the projection lens 46. The 2 nd light source 48 is configured such that the emitted 2 nd light L2 is incident on the projection lens 46 without being reflected by the rotating mirror 44.
This allows the optical characteristics to be selected without considering that the 2 nd light L2 emitted from the 2 nd light source 48 is reflected by the rotating mirror 44. Therefore, by using the 2 nd light source 48 having a wider viewing angle than the 1 st light source 42, a wider range can be illuminated with a simple configuration.
(embodiment 4)
Fig. 15 is a horizontal sectional view of the vehicle headlamp according to embodiment 4. Fig. 16 is a front view of the vehicle headlamp according to embodiment 4. In fig. 16, some components are omitted.
The vehicle headlamp 100 according to embodiment 4 is a left headlamp mounted on the left side of the front end of the automobile, and has the same structure as the headlamp mounted on the right side except that it is bilaterally symmetrical. Therefore, the left vehicle headlamp 100 will be described in detail below, and the right vehicle headlamp will not be described. Note that the description of the configuration overlapping with the optical units according to embodiments 1 to 3 is also omitted as appropriate.
As shown in fig. 15, the vehicle headlamp 100 includes a lamp body 112, and the lamp body 112 has a recess that opens toward the front. The front surface opening of the lamp body 112 is covered with a transparent front cover 114 to form a lamp chamber 116. The lamp chamber 116 functions as a space for accommodating 1 optical unit 118. The optical unit 118 is configured to be able to irradiate both variable high beam and low beam. The variable high beam is a high beam controlled so as to change the shape of a light distribution pattern for high beam, and can generate a non-irradiation region (light shielding portion) in a part of the light distribution pattern, for example.
The optical unit 118 according to the present embodiment includes: the 1 st light source 142; a condenser lens 143 as a 1-order optical system (optical member) for changing the optical path of the 1 st light L1 emitted from the 1 st light source 142 toward the reflective sheet 126a of the rotating mirror 126; a rotating mirror 126 that rotates about a rotation axis R while reflecting the 1 st light L1; a convex lens 130 as a projection lens that projects the 1 st light L1 reflected by the rotating mirror 126 in the light irradiation direction (left direction in fig. 15) of the optical unit; a 2 nd light source 148 disposed between the 1 st light source 142 and the convex lens 130; a diffusion lens 150 as a 1-order optical system (optical member) for changing the optical path of the 2 nd light L2 emitted from the 2 nd light source 148 to be directed toward the convex lens 130; and a heat sink 152 on which the 1 st light source 142 and the 2 nd light source 148 are mounted.
The rotating mirror 126 has the same configuration as the rotating mirror 26 and the rotating mirror 44 described above, and is provided with a reflecting sheet 126a as a reflecting surface so that a predetermined light distribution pattern is formed by scanning the forward direction with light reflected while rotating. As each light source, a semiconductor light emitting element such as an LED, an EL element, or an LD element is used. The shape of the convex lens 130 may be appropriately selected according to the light distribution characteristics such as a desired light distribution pattern and illuminance distribution, but an aspherical lens or a free-form surface lens may be used.
For example, the convex lens 130 according to the present embodiment can form the notch portion 130a by cutting out a part of the outer periphery in the vertical direction by improving the arrangement of the light sources and the rotating mirror 126. Therefore, the size of the optical unit 118 in the vehicle width direction can be suppressed. Further, since the notch 130a is provided, the reflection piece 126a of the rotating mirror 126 is less likely to interfere with the convex lens 130, and the convex lens 130 and the rotating mirror 126 can be brought close to each other. Further, when the vehicle headlamp 100 is viewed from the front, since the non-circular (straight) portion is formed on the outer periphery of the convex lens 130, a novel appearance of the lens having an outer shape in which a curved line and a straight line are combined can be realized when viewed from the front of the vehicle.
Fig. 17 is a plan view of the 1 st light source 142 according to the present embodiment. Fig. 18 is a diagram schematically showing a positional relationship of a plurality of light emitting modules mounted on the 1 st light source 142.
The light emitting modules 154 of the 1 st light source 142 according to the present embodiment are arranged in an array. Specifically, as shown in fig. 17, 9 light emitting modules 154(154a to 154i) are arranged in 3 layers, 5 light emitting modules 154c to 154g are arranged in the upper layer, 2 light emitting modules 154b and 154h are arranged in the middle layer, and 2 light emitting modules 154a and 154i are arranged in the lower layer on the circuit board 144. The middle 2 light emitting modules 154b and 154h are disposed adjacent to the lower portions of the light emitting modules 154c and 154g at both ends of the upper 5 light emitting modules 154c to 154h, and the lower 2 light emitting modules 154a and 154i are disposed adjacent to the lower portions of the middle 2 light emitting modules 154b and 154 h. The light emitting modules 154a to 154i are configured to be able to be independently turned on/off. The specific structure of the light emitting module 154 is the same as that of the light emitting module 54 described above.
As shown in fig. 15 and 16, a light collecting lens 143, which is composed of a plurality of inner lenses corresponding to the light emitting surfaces, is disposed on the light emitting surface side of each light emitting module 154 included in the 1 st light source 142. Thus, the light emitted from the light emitting module 54 reaches the reflecting surface of the rotating mirror 126 without being substantially diffused.
The 2 nd light source 148 is arranged such that 2 light emitting modules 153 are arranged in an array in the horizontal direction, and each light emitting module 153 can be independently turned on/off. The specific structure of the light emitting module 153 is the same as that of the light emitting module 54.
The 2 nd light source 148 according to the present embodiment is arranged such that the 2 nd light L2 enters the convex lens 130 without being reflected by the rotating mirror 126. This makes it possible to select the optical characteristics without considering that the 2 nd light L2 emitted from the 2 nd light source 148 is reflected by the rotating mirror 126. Therefore, for example, since the light emitted from the 2 nd light source 148 is diffused by the diffusion lens 150 and then enters the convex lens 130, and can be irradiated over a wider range, the 2 nd light source 148 can be used as a light source of the low beam light distribution pattern.
Fig. 19 is a diagram showing a pattern P projected forward by reflecting the light source image with the rotating mirror 126 in a stationary state in a state where all the 1 st light sources 142 are lit. Fig. 20 is a diagram schematically showing a light distribution pattern formed by the vehicle headlamp 100 having the optical unit according to embodiment 4.
The light distribution pattern shown in fig. 20 is obtained by combining a light distribution pattern PH for high beam and a light distribution pattern PL for low beam. The high beam light distribution pattern PH is a pattern generated by scanning the pattern P shown in fig. 19.
As shown in fig. 19, a concave pattern P is formed by the light source images 155a to 155i corresponding to the light emitting surfaces of the light emitting modules 154a to 154 i. Further, the light source images 155a to 155i are scanned to form the scanning patterns Pa to Pi, respectively, and the scanning patterns Pa to Pi are superimposed to form the light distribution pattern PH for high beam. The intervals between the light emitting modules 154a and 154i are set so that at least a part of the scanning patterns Pa and Pi overlap each other. Similarly, the intervals of the light emitting modules 154b and 154h are defined such that at least a portion of the scan pattern Pb and the scan pattern Ph overlap.
Further, the light emitted from the light emitting module 153 of the 2 nd light source 148 and diffused by the diffusing lens 150 passes through the convex lens 130 to irradiate the region below the H-H line and to the right of the V-V line as the low-beam light distribution pattern PL. It goes without saying that the entire region below the H-H line is irradiated with the pair of left and right vehicle headlamps 100. As described above, the optical unit 118 according to the present embodiment can project the light emitted from the 1 st light source 142 and the 2 nd light source 148 forward using the common convex lens 130, and thus can irradiate a wide range with a simple configuration.
The 1 st light source 142 according to the present embodiment includes: light emitting modules 154c to 154g as a 1 st light emitting unit that emit light for scanning a 1 st region R1 including a maximum luminous intensity region Rmax in the light distribution pattern PH for high beam; light emitting modules 154b and 154h as a 2 nd light emitting unit that emit light for scanning a 2 nd region R2 adjacent to the 1 st region R1; and light emitting modules 154a and 154i as a 3 rd light emitting unit that emits light for scanning a 3 rd region R3 adjacent to the 2 nd region R2. The maximum luminous intensity region Rmax of the high beam light distribution pattern PH according to the present embodiment is a region in the vicinity of a point where an H-H line and a V-V line intersect.
In addition, as shown in fig. 18, the 1 st light source 142 according to the present embodiment satisfies L1 > L2 if the sum of the lengths of the entire light-emitting modules 154c to 154g in the longitudinal direction is L1 and the sum of the lengths of the light-emitting modules 154b and 154h in the direction parallel to the entire light-emitting modules 154c to 154g in the longitudinal direction is L2 (L2' + L2).
Thus, the optical unit 118 includes the light emitting modules 154b and 154h for scanning the 2 nd region R2 adjacent to the 1 st region R1 in addition to the light emitting modules 154c to 154g for scanning the 1 st region R1 including the maximum luminous intensity region, and thus can realize a wider range of illumination while satisfying the maximum luminous intensity.
In the 1 st light source 142 according to the present embodiment, if the number of light-emitting modules 154 scanning the 1 st region R1 including the maximum luminous intensity region is N1(N1 is 5), and the number of light-emitting modules 154 scanning the 2 nd region R2 is N2(N2 is 2), N1 > N2 is satisfied. This can suppress the number of light-emitting modules 154 that emit light for scanning the 2 nd region R2 that does not include the maximum luminous intensity region Rmax.
As shown in fig. 17 and 18, the area of the 2 nd light emitting unit ( light emitting modules 154b and 154h) is smaller than the area of the 1 st light emitting unit (light emitting modules 154c to 154 g). This can reduce the number of light-emitting modules 154 constituting the 2 nd light-emitting unit compared to the 1 st light-emitting unit, for example.
As shown in fig. 18, the light-emitting modules 154b and 154h are a plurality of light-emitting regions provided separately with a non-light-emitting region R4 interposed therebetween. Thus, as shown in fig. 20, the 2 nd region R2 having the same wide range as the 1 st region R1 can be irradiated with only 2 scan patterns Pb and Ph without enlarging the light-emitting modules 154b and 154 h.
The light emitting modules 154b and 154h are provided adjacent to the light emitting modules 154c and 154g located at both ends in the longitudinal direction of the light emitting modules 154c to 154g, respectively. Thus, the light emitting modules 154b and 154h can irradiate the same width of the regions irradiated by the light emitting modules 154c to 154 g.
Fig. 21(a) to 21(c) are views showing modifications of the high beam light distribution pattern by the 1 st light source 142 according to the present embodiment.
The high beam light distribution pattern PH 1' shown in fig. 21(a) is a pattern in which a part of the 3 rd region R3 is a light blocking region (non-irradiation region). Therefore, the light emitting modules 154a and 154i may be turned off at a predetermined timing.
The high beam light distribution pattern PH 2' shown in fig. 21(b) is a pattern in which a part of the 1 st region R1 and the 2 nd region R2 is a light shielding region (non-irradiation region). Therefore, the light emitting modules 154b to 154h may be turned off at a predetermined timing.
The high beam light distribution pattern PH 3' shown in fig. 21(c) is a pattern in which a part of the 1 st region R1 is a light blocking region (non-irradiation region). Therefore, the light emitting modules 154c to 154g may be turned off at a predetermined timing.
As described above, in the optical unit 118 according to the present embodiment, in order to increase the maximum luminous intensity in the central portion of the 1 st region R1, a plurality of light emitting modules are arranged in the 1 st direction such that light source images are aligned in the scanning direction (horizontal direction), and in order to expand the irradiation range in the direction intersecting the scanning direction, a light emitting module is also arranged in the 2 nd direction intersecting the 1 st direction.
The present invention has been described above with reference to the above embodiments, but the present invention is not limited to the above embodiments, and a configuration obtained by appropriately combining the structures of the embodiments or a configuration obtained by substitution is also included in the present invention. Further, the combination and the order of processing in the embodiments may be appropriately rearranged or modifications such as various design changes may be made to the embodiments based on the knowledge of those skilled in the art, and embodiments to which such modifications are applied may be included in the scope of the present invention.
Claims (13)
1. An optical unit, comprising:
1 st light source;
a 2 nd light source;
a rotating mirror that rotates about a rotation axis while reflecting the 1 st light emitted from the 1 st light source; and
a projection lens for projecting the 1 st light reflected by the rotating mirror toward a light irradiation direction of the optical unit,
the 2 nd light source is configured such that the emitted 2 nd light is incident on the projection lens without being reflected by the rotating mirror,
the projection lens projects the 2 nd light toward a light irradiation direction of the optical unit,
the 2 nd light source is disposed between a substrate on which the 1 st light source is mounted and the rotating mirror when viewed from the front of the vehicle.
2. An optical unit according to claim 1,
the projection lens is configured such that,
projecting the 1 st light reflected and incident by the rotating mirror in the light irradiation direction of an optical unit to form a condensed light distribution pattern,
the 2 nd light incident on the rotary mirror but not reflected by the rotary mirror is projected in the light irradiation direction of the optical unit as a diffused light distribution pattern.
3. An optical unit according to claim 1 or 2,
the 2 nd light source has a plurality of light emitting elements arranged in an array.
4. An optical unit, comprising:
1 st light source;
a rotating mirror that rotates about a rotation axis while reflecting the 1 st light emitted from the 1 st light source;
a projection lens that projects the 1 st light reflected by the rotating mirror toward a light irradiation direction of the optical unit;
a 2 nd light source disposed between the 1 st light source and the projection lens; and
an optical member that changes an optical path of the 2 nd light emitted from the 2 nd light source to face the projection lens,
the 2 nd light source is configured such that the emitted 2 nd light is incident on the projection lens without being reflected by the rotating mirror.
5. An optical unit according to claim 4,
the projection lens is configured such that,
projecting the 1 st light reflected and incident by the rotating mirror in the light irradiation direction of an optical unit to form a condensed light distribution pattern,
the 2 nd light incident on the rotary mirror but not reflected by the rotary mirror is projected in the light irradiation direction of the optical unit as a diffused light distribution pattern.
6. An optical unit according to claim 4 or 5,
the 2 nd light source has a plurality of light emitting elements arranged in an array.
7. An optical unit, comprising:
1 st light source;
a rotating mirror that rotates about a rotation axis while reflecting the 1 st light emitted from the 1 st light source;
a projection lens that projects the 1 st light reflected by the rotating mirror toward a light irradiation direction of the optical unit;
a 2 nd light source disposed between the 1 st light source and the projection lens; and
an optical member that reflects the 2 nd light emitted from the 2 nd light source toward the projection lens,
the 2 nd light source is configured such that the emitted 2 nd light is incident on the projection lens without being reflected by the rotating mirror.
8. An optical unit, characterized in that,
comprising: a light source; and a rotating mirror that rotates around a rotation axis while reflecting light emitted from the light source,
the rotating reflector is provided with a reflecting surface so that a predetermined light distribution pattern is formed by scanning the front with light reflected while rotating,
the light source has: a 1 st light emitting unit that emits 1 st light for scanning a 1 st region including a maximum luminous intensity region in the light distribution pattern; and a 2 nd light emitting unit which emits a 2 nd light for scanning a 2 nd region adjacent to the 1 st region,
l1 > L2 is satisfied if the total of the lengths of the 1 st light-emitting part in the longitudinal direction is L1 and the total of the lengths of the 2 nd light-emitting part in the direction parallel to the 1 st light-emitting part in the longitudinal direction is L2.
9. An optical unit according to claim 8,
n1 > N2 is satisfied if the number of light-emitting elements constituting the 1 st light-emitting part is N1 and the number of light-emitting elements constituting the 2 nd light-emitting part is N2.
10. An optical unit according to claim 8,
the area of the 2 nd light emitting part is smaller than that of the 1 st light emitting part.
11. An optical unit according to claim 9,
the area of the 2 nd light emitting part is smaller than that of the 1 st light emitting part.
12. An optical unit according to any one of claims 8 to 11,
the 2 nd light emitting part has a plurality of light emitting regions separately provided with a non-light emitting region therebetween.
13. An optical unit according to claim 12,
the plurality of light emitting regions are provided adjacent to both longitudinal ends of the 1 st light emitting part.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2016202551 | 2016-10-14 | ||
| JP2016-202551 | 2016-10-14 | ||
| JP2017-001996 | 2017-01-10 | ||
| JP2017001996A JP6951076B2 (en) | 2016-10-14 | 2017-01-10 | Optical unit |
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| CN108375029A CN108375029A (en) | 2018-08-07 |
| CN108375029B true CN108375029B (en) | 2021-03-09 |
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| JP (1) | JP6951076B2 (en) |
| CN (1) | CN108375029B (en) |
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| WO2020066406A1 (en) * | 2018-09-25 | 2020-04-02 | 株式会社小糸製作所 | Light shining device |
| JPWO2020066402A1 (en) * | 2018-09-25 | 2021-08-30 | 株式会社小糸製作所 | Light irradiation device |
| WO2020080512A1 (en) | 2018-10-19 | 2020-04-23 | 株式会社小糸製作所 | Vehicle lamp, lamp unit and reflector module |
| WO2020080134A1 (en) * | 2018-10-19 | 2020-04-23 | 株式会社小糸製作所 | Vehicular lamp and rotary reflector |
| JP7355754B2 (en) | 2018-10-19 | 2023-10-03 | 株式会社小糸製作所 | Manufacturing method of rotating reflector and rotating reflector |
| CN116677952A (en) | 2018-12-25 | 2023-09-01 | 株式会社小糸制作所 | Optical unit |
| CN212644476U (en) * | 2019-08-26 | 2021-03-02 | 株式会社小糸制作所 | Vehicle lamp |
| CN112432137B (en) | 2019-08-26 | 2022-11-15 | 株式会社小糸制作所 | Lens and lamp |
| WO2022210913A1 (en) * | 2021-03-30 | 2022-10-06 | 株式会社小糸製作所 | Lamp unit |
| WO2023095530A1 (en) * | 2021-11-24 | 2023-06-01 | 株式会社小糸製作所 | Optical unit |
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| JP2015230769A (en) * | 2014-06-03 | 2015-12-21 | 株式会社小糸製作所 | Vehicular lighting tool |
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| US10192124B2 (en) * | 2010-04-13 | 2019-01-29 | Koito Manufacturing Co., Ltd. | Optical unit, vehicle monitor, and obstruction detector |
| DE102010041096A1 (en) * | 2010-09-21 | 2012-03-22 | Osram Ag | lighting device |
| JP5722702B2 (en) * | 2011-05-19 | 2015-05-27 | スタンレー電気株式会社 | Vehicle lighting |
| JP6162497B2 (en) * | 2013-06-21 | 2017-07-12 | 株式会社小糸製作所 | Lamp unit and vehicle lamp |
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| JP2015230769A (en) * | 2014-06-03 | 2015-12-21 | 株式会社小糸製作所 | Vehicular lighting tool |
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| FR3065275B1 (en) | 2020-06-12 |
| FR3065275A1 (en) | 2018-10-19 |
| CN108375029A (en) | 2018-08-07 |
| JP2018067523A (en) | 2018-04-26 |
| JP6951076B2 (en) | 2021-10-20 |
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