CN103727475A - Vehicular headlamp - Google Patents

Vehicular headlamp Download PDF

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Publication number
CN103727475A
CN103727475A CN201310475741.0A CN201310475741A CN103727475A CN 103727475 A CN103727475 A CN 103727475A CN 201310475741 A CN201310475741 A CN 201310475741A CN 103727475 A CN103727475 A CN 103727475A
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CN
China
Prior art keywords
light
projection lens
headlight
automobile
high beam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201310475741.0A
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Chinese (zh)
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CN103727475B (en
Inventor
田中秀忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2012-226737 priority Critical
Priority to JP2012226737A priority patent/JP6095937B2/en
Application filed by Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Publication of CN103727475A publication Critical patent/CN103727475A/en
Application granted granted Critical
Publication of CN103727475B publication Critical patent/CN103727475B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/143Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/151Light emitting diodes [LED] arranged in one or more lines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25Projection lenses
    • F21S41/255Lenses with a front view of circular or truncated circular outline
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32Optical layout thereof
    • F21S41/321Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

A good vehicular headlamp can generate a projection light as a so-called high beam, and prevent the reflection to a light shielding region. The vehicular headlamp includes a semiconductor light emitting element as a light source, and a projection lens configured to project light emitted from the semiconductor light emitting element to the outside from an irradiation surface. Both an upper portion and lower portion of the irradiation surface of the projection lens serve as a control surface configured to emit the light emitted from a focal point upwards relative to a parallel light. A projection light as a high beam can be generated by the surface shape of the projection lens, and thus a reflector, as in the prior art, for generating a high beam is not necessary. As a result, prevention of the reflection to a light shielding region is realized.

Description

Headlight for automobile
Technical field
The present invention relates to a kind of headlight for automobile.Concrete, relate to a kind of generation as the headlight for automobile of the projection light of high beam (upwards, distance light), its face shape by projection lens realizes good light distribution patterns.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2007-213877 communique
Background technology
In headlight for automobile, in the inside of the light fixture housing being formed by outer cover and lamp body, as light source, dispose the Diode such as LED(Light Emitting) etc. semiconductor light-emitting elements (for example, with reference to above-mentioned patent documentation 1).
And, as this headlight for automobile, adopt a plurality of semiconductor light-emitting elements array structure of (left and right directions) assortment in the horizontal direction.
Fig. 8 and Fig. 9 are usingd the semiconductor light-emitting elements of array structure as the key diagram of the general configuration of the headlight for automobile of light source.Fig. 8 is the roughly cutaway view of this headlight for automobile, and Fig. 9 is the front view with the illuminator of array-like assortment by a plurality of semiconductor light-emitting elements.In addition, the V of arrow shown in figure represents vertical direction (above-below direction), and arrow H represents horizontal direction (left and right directions).
As shown in Figure 8, in this headlight for automobile, the light sending from semiconductor light-emitting elements 100 projects to vehicle front via projection lens 101.The cutaway view that has represented vertical direction in Fig. 8, in the horizontal direction, as shown in Figure 9, a plurality of semiconductor light-emitting elements 100 are with array-like assortment.
At this, in the past as projection lens 101, adopt the structure of the light output directional light based on penetrating from light source.
As a reference, Figure 10 represents the light distribution patterns of realizing by (common) projection lens 101 in the past for example.Arrow V, H in figure, the same with the situation of Fig. 8 and Fig. 9 respectively, represent vertical direction, horizontal direction.
At this, as headlight for automobile, in order to realize so-called high beam (upwards, distance light), be required to carry out more luminous intensity distribution for the position of the more top side of horizontal datum Hr than the regulation shown in Figure 10.
Known with reference to Figure 10, in the situation that utilize (common) projection lens 101 of output directional light in the past, the horizontal datum Hr of take is the upper and lower approximate equality in border distributes luminous intensity distribution, therefore, in the situation that using this projection lens 101, needs for realizing certain device of high beam.
In the past, by usining in the headlight for automobile that the semiconductor light-emitting elements of array-like assortment uses as light source, when realizing high beam, used the reflector 102 as shown in Figure 11 and Figure 12.Figure 11 means the cutaway view of the general configuration of headlight for automobile, and Figure 12 is being provided with the front view of the illuminator of reflector 102 with each semiconductor light-emitting elements 100 of array-like assortment.
As shown in figure 11, reflector 102 forms: than the light-emitting area of semiconductor light-emitting elements 100 position more on the front, be respectively equipped with the reflection of light face sending from semiconductor light-emitting elements 100 in upper and lower all directions reflection.
By above-mentioned reflector 102 is set, at projection lens 101, be not only the direct light from semiconductor light-emitting elements 100, from semiconductor light-emitting elements 100, penetrate and be also launched at the light of the reflecting surface reflection of this reflector 102.That is,, by the reverberation from this reflector 102, can give variation to light distribution patterns.
The angle of inclination of reflecting surface up and down by this reflector 102 is, the setting of length, can adjust upward light distribution patterns at the upper and lower of the emergent light of projection lens 101.That is, can realize high beam thus.
Summary of the invention
The technical problem that invention will solve
But in the situation that reflector 102 is set, H is upper in the horizontal direction, produce sometimes the problem that light diffusion causes.
Particularly, the diffusion of the light on this horizontal direction H, is from semiconductor light-emitting elements 100 to being reflected and produced by reflector 102 as the light sending with the incline direction as shown in arrow Figure 12.
Due to the upper diffusion that produces above-mentioned light of H in the horizontal direction, head lamp system, special in the situation that it is configured to the open/close control that has by semiconductor light-emitting elements 100 by the function of a part of shading of horizontal direction H, generation cannot be by the region of the hope problem of shading suitably.In addition, in order to confirm wish explanation, such as the vehicle front finder object of etc.ing in the situation that, above-mentioned shade function for by regioselectivity corresponding to the position existing with this object the purposes such as shading.
Figure 13 represents according to the light distribution patterns of headlamp in the past and the concrete example of the relation of lightproof area.
And in the figure similarly, arrow V, H represent respectively vertical direction, horizontal direction.In addition, in this figure, also represent horizontal datum Hr.
According to above-mentioned shade function, for example, be only that a part of desired area on the horizontal direction H representing with region Ac in figure becomes should be by optionally shading.In other words, in a plurality of semiconductor light-emitting elements 100 with array-like assortment, by only closing the semiconductor light-emitting elements 100 that is configured in the position corresponding with this region Ac, only realize this region Ac by optionally shading.
But, in the situation that be provided for realizing the reflector 102 of the high light velocity, along with the diffusion of the horizontal direction H shown in Figure 13, as in figure with as shown in X, produce to should mirroring by the region Ac of shading.That is, a part of this region Ac is also carried out to luminous intensity distribution.
Like this, using reflector 102 to realize in the headlight for automobile in the past of high beam, take shade function as prerequisite in the situation that, generation cannot be by the region of the hope problem of shading suitably.
The present invention in view of the above problems, is intended to realize a kind of good headlight for automobile, and it can produce the projection light as so-called high beam, and, seek to prevent mirroring to lightproof area.
The technical scheme of technical solution problem
In order to solve the problems of the technologies described above, in the present invention, headlight for automobile has following structure.
That is, headlight for automobile of the present invention has as the semiconductor light-emitting elements of light source and the projection lens that the light penetrating from described semiconductor light-emitting elements is projected from shadow surface to outside.And the upper portion of the described shadow surface of described projection lens, lower quadrate part both sides are as the chain of command that the light ratio directional light that comes from focus is penetrated more upward.
According to the invention described above, the face shape by projection lens, can produce the projection light as high beam.Therefore,, without the reflector in the past that is provided for realizing high beam, consequently, can seek to prevent mirroring to lightproof area.
The effect of invention
According to above-mentioned headlight for automobile of the present invention, have as the semiconductor light-emitting elements of light source and the projection lens that the light penetrating from described semiconductor light-emitting elements is projected from shadow surface to outside, by making the upper portion of the described shadow surface of described projection lens, lower quadrate part both sides as the chain of command that the light ratio directional light that comes from focus is penetrated more upward, can realize and make the projection light producing as high beam become possibility, and, seek to prevent the good headlight for automobile of mirroring to lightproof area.
In addition,, in the invention described in technical scheme 2, the upper portion of described shadow surface, lower quadrate part, by the setting of its curvature, penetrate the light ratio directional light that comes from described focus more upward.According to this structure, can will make the projection light producing as high beam become possibility, and, seek to prevent the good headlight for automobile of mirroring to lightproof area, by adjusting the relatively simple method of the shadow surface curvature of projection lens, realize.
In addition, in the invention described in technical scheme 3, the face shape of described upper portion, described lower quadrate part is configured to: a side of the light penetrating via described lower quadrate part compares with the light penetrating via described upper portion, large with respect to the angle change of directional light.One side of the light of lower quadrate part, more towards top, therefore becomes more applicable as high beam.
In addition,, in the invention described in technical scheme 4, the curvature of shadow surface described in described upper portion more approaches periphery and more diminishes.Thus, can seek to prevent that particularly the blue short-wavelength light that waits falls the situation causing as the light distribution patterns characteristic degradation of high beam to road surface side.
In addition,, in the invention described in technical scheme 5, the curvature of shadow surface described in described lower quadrate part more approaches periphery and more becomes large.The bendingof light of downside is larger, therefore as high beam, becomes more applicable.
Accompanying drawing explanation
Fig. 1 and the preferred forms that represents headlight for automobile of the present invention together with Fig. 2 to Fig. 9, this figure is the substantially vertical cutaway view of headlight for automobile.
Fig. 2 is the roughly front view of headlight for automobile.
Fig. 3 means the schematic diagram as the example of the light distribution patterns of high beam.
Fig. 4 is the schematic diagram that the lens curved surface of the projection lens of present embodiment is represented by vertical sectional view.
Fig. 5 is for the schematic diagram of effect of the projection lens of present embodiment is described.
Fig. 6 means by the figure of the light distribution patterns of the projection lens of present embodiment.
Fig. 7 is for the figure of concrete Lens Design of the projection lens of present embodiment is described.
Fig. 8 is usingd the roughly cutaway view of the headlight for automobile that the semiconductor light-emitting elements of array structure possesses as light source.
Fig. 9 is the front view with the illuminator of array-like assortment by a plurality of semiconductor light-emitting elements.
Figure 10 is the figure that the light distribution patterns of (common) projection lens realization is in the past passed through in expression for example.
Figure 11 is for by usining in the headlight for automobile that the semiconductor light-emitting elements of array-like assortment uses as light source, represents for realizing the roughly cutaway view of the structure of high beam.
Figure 12 is arranging the front view of the illuminator of reflector with each semiconductor light-emitting elements of array-like assortment.
Figure 13 means according to the figure of the concrete example of the light distribution patterns of headlamp in the past and the relation of lightproof area.
Symbol description
1 headlight for automobile 2 lamp body 3 outer cover 4 light fixture housing 5 lamp house 6,7 bracket 7a are supported portion's 8 thermal component 9 radiating fans 10 and aim at adjustment screw 11 lens mount 12 projection lens 13,14 extension 15 semiconductor light-emitting elements 16 substrates
The specific embodiment
Below, with reference to accompanying drawing, to implementing the preferred forms of headlight for automobile of the present invention, describe.
Fig. 1 and Fig. 2 are the key diagrams to the structure of the headlight for automobile 1 as embodiment, and Fig. 1 is the substantially vertical cutaway view of headlight for automobile 1, and Fig. 2 is the roughly front view of headlight for automobile 1.
Headlight for automobile 1 forms, and the inside of the light fixture housing 4 consisting of lamp body 2 and the outer cover 3 that is installed on the leading section of lamp body 2, as lamp house 5, has the illuminating part (with reference to Fig. 1 and Fig. 2) of illuminator 6, projection lens 12 in the interior formation of lamp house 5.
The headlight for automobile 1 of present embodiment becomes the remote high beam of irradiation (upwards, distance light) and uses headlamp.
Described illuminating part is installed required each portion being disposed on the bracket 7 of lamp house 5.
Bracket 7 is formed by the high metal material of heat conductivity, at upper and lower both ends, is provided with and is supported the 7a of portion, 7a, 7a.Thermal component (cooling pin) 8 is installed after bracket 7.Radiator fan 9 is installed after thermal component 8.
At bracket 7 central portion above, illuminator 6 is installed.Illuminator 6 have be installed on the substrate 16 above of bracket 7 and the semiconductor light-emitting elements 15,15 of installing dividing right and left above of substrate 16 ... (with reference to Fig. 1).Semiconductor light-emitting elements 15,15 ... play the effect as light source.
Although omit in the drawings, semiconductor light-emitting elements 15 has the luminescent coating above that is positioned at the semiconductor layer of rear side and is layered in semiconductor layer.
As semiconductor light-emitting elements 15,15 ..., for example, use light emitting diode (LED:Light Emitting Diode).In this case, the illuminant colour that illuminator 6 produces is white.
At this, the in the situation that of present embodiment, substrate 16 is not arranged to reflector.That is the light, sending from semiconductor light-emitting elements 15 is not injected projecting lens 12 described later via the reflection of reflector.
Before bracket 7, lens mount 11(is installed with reference to Fig. 1).Lens mount 11 is formed on roughly cylindric that fore-and-aft direction connects, and is installed in bracket 7 to cover illuminator 6.
Leading section at lens mount 11 is provided with projection lens 12.Projection lens 12 forms protruding roughly hemispherical forwardly, will from semiconductor light-emitting elements 15,15 ... the light penetrating forwards projects.
In addition, bracket 7 screws togather link at the 7a of the portion that is supported, 7a, the 7a of this bracket 7 separately by aiming at adjustment screw 10,10,10.Bracket 7 is aimed at adjustment screw 10,10,10 via these and can freely be fascinated and be supported at lamp body 2.Aim at and adjust screw 10 rotations, the 7a of the portion that is supported, the 7a screwing togather position except this aligning adjustment screw 10 of take is fulcrum, and bracket 7 fascinates at left and right directions or above-below direction, carries out the adjustment (aim at and adjust) of optical axis.
In addition as shown in Figure 1, in lamp house 5, be provided with extension (covering) 13,14.These extensions 13,14 be respectively used to cover relate to above-mentioned aligning adjustment portion of mechanism etc., do not wish the part of seeing from the outside of outer cover 3.
In addition, in headlight for automobile 1, not shown horizontal actuator is preferably set, by the driving of this horizontal actuator, bracket 7 up and down direction fascinates, and adjusts the horizontal adjustment of optical axis direction according to the weight of vehicle-mounted thing.
In addition, although omit in the drawings, semiconductor light-emitting elements 15,15 ... from a lamp driver, supply separately drive current, be supplied drive current semiconductor light-emitting elements 15,15 ... lit a lamp, be not supplied drive current semiconductor light-emitting elements 15,15 ... maintain the state of turning off the light.
Thus, can realize aforesaid shade function.
In addition, for semiconductor light-emitting elements 15,15 ..., also can change respectively from the control of the current value of the drive current of the line feed of lighting a lamp.
At this, the headlight for automobile 1 of above-mentioned present embodiment is used as the headlamp of high beam.
At Fig. 3, schematically show the example of the light distribution patterns TH of high beam.
Light distribution patterns TH be in this case from each semiconductor light-emitting elements 15,15 ... distribution T1, the T2 of the light penetrating ... synthesize and form, distribution T1, the T2 of light ... the upper coincidence of (left and right directions) H in the horizontal direction.Distribution T1, the T2 of light ... in, the left and right width of the central portion of H is minimum in the horizontal direction, and along with the outer side shifting to horizontal direction H, it is large that left and right width becomes successively.In addition, distribution T1, the T2 of light ... in, the width up and down of the central portion of H is maximum in the horizontal direction, and along with the outer side shifting to horizontal direction H, upper and lower width diminishes successively.
And the light distribution patterns TH of high beam, carries out more luminous intensity distribution for the position of the more top side of horizontal datum Hr of the regulation representing with single-point line than in figure.
As aforesaid shade function, during by a part of region shading of the upper regulation of horizontal direction H, make with figure in light distribution T1, T2 ... a plurality of semiconductor light-emitting elements 15 corresponding to distribution T of a plurality of light of middle regulation are turned off the light.For example, during by region shading between the distribution T5 of the light in figure and T2, make to turn off the light with the T4 that distributes, the T3 corresponding semiconductor light-emitting elements 15 that distributes.
At this as previously mentioned, in headlight for automobile in the past, although by being located at the effect of the reflector (reflector 102) of light source front side, realize high beam, in this case, above-mentioned shade function will produce to the mirroring of lightproof area, and existence cannot realize the problem of suitable shading.
Therefore, in the present embodiment, by suitably setting the shadow surface shape of projection lens 12, by this projection lens 12, be used for seeking to realize high beam.
Particularly, make the upper portion of the shadow surface of projection lens 12, lower quadrate part both sides as the chain of command that the light ratio directional light that comes from focus is penetrated more upward, to realize high beam.
Fig. 4 is the schematic diagram that the lens curved surface of the projection lens of present embodiment 12 is represented by vertical sectional view.In addition, from this Fig. 4, in Fig. 5 to Fig. 7, in the vertical direction the upper and lower of V to respectively with the upper and lower of paper to consistent.
In Fig. 4, the vertical section shape of the shadow surface of the projection lens of present embodiment 12 is represented with solid line, as a comparison, the vertical section shape of the shadow surface of common projection lens is represented by dotted lines.At this, common projection lens refers to and is designed to come from the projection lens of the light of focus with directional light ejaculation.
In addition, in the drawings, the optical axis P that injects the light of projection lens 12 from semiconductor light-emitting elements 15 ejaculations is also expressed in the lump.
As shown in the figure, the shadow surface of the projection approach 12 of present embodiment, the curvature of its upper portion is compared little with common lens curved surface, and the common lens curved surface of ratio of curvature of its lower quadrate part is compared greatly.
Fig. 5 is the schematic diagram of effect of the projection lens 12 of the explanation present embodiment of setting above-mentioned shadow surface shape.
As shown in Figure 5, according to the setting of the shadow surface shape in Fig. 4 explanation, can be respectively will penetrate and penetrate upward together via the light of the shadow surface upper portion of projection lens 12 and via the light of quadrate part shadow surface from illuminating part 6.That is, can realize high beam thus.
Fig. 6 means according to the figure of the light distribution patterns of the projection lens 12 of present embodiment.In addition, in Fig. 6, represent by aforementioned shade function by horizontal direction H, stipulate a part of region shading time light distribution patterns.
By making the upper portion of shadow surface, lower quadrate part as above-mentioned chain of command, the known light distribution patterns that can realize as high beam.That is,, in the realization of high beam, do not need reflector 102 in the past.Thus, according to the projection lens 12 of present embodiment, the diffusion of the light to horizontal direction H that inhibitory reflex device 102 causes effectively, its result, as shown in the arrow X by figure, can suppress the generation of mirroring to lightproof area effectively.
At this, in the realization of high beam, preferably, via the light of the lower side of shadow surface, penetrate more upward.Therefore, in the projection lens 12 of present embodiment, face shape is set as: the light penetrating via the lower quadrate part of shadow surface is compared with the light penetrating via upper portion, larger with respect to the angle of directional light.
Thus, can realize the headlight for automobile 1 that is more suitable for high beam.
But, the convex lens the projection lens 12 as present embodiment, especially at its peripheral part, due to the impact of aberration, the ejaculation differential seat angle with each coloured light becomes large tendency.As concrete phenomenon, particularly the short light of blue light equiwavelength, compares larger ground complications and penetrates at the long light of peripheral part and ripple of lens.
While considering as the headlight for automobile 1 of high beam, the light to the lower quadrate part via projection lens 12, preferably makes crooked change greatly.If crooked the change greatly of lower quadrate part of projection lens 12, the light of downside penetrates more upward.
On the other hand, for the light of the upper portion via projection lens 12, if crooked, become large, penetrate light and likely become than directional light downwards.That is, as concrete phenomenon, as previously mentioned, in the upper portion of projection lens 12, only make the common lens curved surface of its ratio of curvature little, the short blue light of wavelength likely penetrates downwards than directional light.Consequently, via the blue light of upper portion, to road surface side, fall, produce the problem as the light distribution patterns characteristic degradation of high beam that makes.
Consider this point, in the projection lens 12 of present embodiment, make the curvature of shadow surface upper portion more approach periphery and more diminish.Thus, can seek to prevent particularly via short-wavelength lights such as near the bluenesss topmost of shadow surface, to road surface side, fall and make the situation as the light distribution patterns characteristic degradation of high beam.
In addition,, in the projection lens 12 of present embodiment, make the curvature of quadrate part under shadow surface more approach periphery and more become large.
Thus, the bendingof light of downside is larger, more applicable as high beam.
Fig. 7 is for the figure of concrete Lens Design of the projection lens 12 of above-mentioned present embodiment is described.
As shown in the figure, in the design's example, from focal point F, penetrate and inject the light beam of projection lens 12, as from becoming upwards the light of 14 ° with respect to optical axis P to the light of central portion of scope that becomes the light of downward 15 ° with respect to optical axis P, from shadow surface, with directional light, penetrate.; the shadow surface of projection lens 12 in this case; the face shape of the part that the light of above-mentioned central portion (15 ° of 14 °~belows, top) penetrates becomes the shape identical with the situation of common projection lens; in other words; compare with the part that the light of above-mentioned central portion penetrates, the face shape on top becomes less than common lens curved surface curvature, and; compare with the part that the light of above-mentioned central portion penetrates, the face shape of bottom becomes larger than common lens curved surface curvature.Further, in projection lens 12 in this case, on its shadow surface, be positioned at the part more closer to the top than the part of the light ejaculation of above-mentioned central portion suitable with " upper portion " of the present invention, similarly, be positioned at the part that penetrates than the light of above-mentioned central portion part more on the lower suitable with " lower quadrate part " of the present invention.
As shown in the figure, projection lens 12 is in this case designed to: the light via " upper portion " of its shadow surface penetrates with 5.16 ° upward with respect to directional light, and, via the light of " the lower quadrate part " of its shadow surface, with respect to directional light, with 3.06 °, penetrate upward.In other words, projection lens 12 in this case, the curvature separately of " upper portion " of its shadow surface, " lower quadrate part " is set to and can obtains above-mentioned ejaculation angle.
For example, by such Lens Design, can realize the good high beam light distribution patterns as shown in prior figures 6.
As described above, in the present embodiment, for the headlight for automobile 1 having as the semiconductor light-emitting elements 15 of light source and projection lens 12 that the light penetrating from this semiconductor light-emitting elements 15 is projected from from shadow surface to outside, the upper portion of the shadow surface of its projection lens 12, lower quadrate part both sides are as the chain of command that the light ratio directional light that comes from focus is penetrated upward.
Face shape by projection lens 12 can produce the projection light as high beam, can, without the reflector as in the past 102 that is provided for realizing high beam, consequently, can seek to prevent mirroring to lightproof area.Thus, can realize and make the projection light producing as high beam become possibility, and, seek to prevent the good headlight for automobile 1 of mirroring to lightproof area.
Now, in the present embodiment, by the described upper portion of projection lens 12, the curvature of described lower quadrate part, set, the light ratio directional light of using from focus penetrates more upward.Thus, allow to produce the projection light as high beam, and, seeking to prevent the good headlight for automobile 1 of mirroring to lightproof area, can realize by adjusting the relatively simple method of the shadow surface curvature of projection lens 12.
In addition, in the present embodiment, the face shape of described upper portion, described lower quadrate part is configured to: a side of the light penetrating via the lower quadrate part of shadow surface compares with the light penetrating via upper portion, with respect to the angle of directional light, becomes large.Thus, a side of the light of lower quadrate part, more towards top, therefore becomes more applicable as high beam.
In addition, in the present embodiment, make the upper portion curvature of shadow surface more approach periphery and more diminish, thus, particularly can seek to prevent that the blue short-wavelength light that waits from falling the situation causing as the light distribution patterns characteristic degradation of high beam to road surface side.
In addition, in the present embodiment, make under shadow surface quadrate part curvature more approach periphery and more become greatly, thus, the bendingof light of downside is larger, as high beam, becomes more applicable.
In addition, in the above description, using as a plurality of semiconductor light-emitting elements 15,15 of light source ... the array of configuration as an example side by side, but as a plurality of semiconductor light-emitting elements 15,15 of light source ... dispensable, use single semiconductor light-emitting elements 15 to be also fine as light source.
In above-mentioned preferred forms, the shape of each several part and structure are all concrete examples when only conduct enforcement is of the present invention, can not make thus the explanation that limits the technology of the present invention scope.

Claims (5)

1. a headlight for automobile, is characterized in that, has:
Semiconductor light-emitting elements as light source; With
The projection lens that the light penetrating from described semiconductor light-emitting elements is projected from shadow surface to outside,
Make the upper portion of the described shadow surface of described projection lens, lower quadrate part both sides as the chain of command that the light ratio directional light that comes from focus is penetrated more upward.
2. headlight for automobile as claimed in claim 1, is characterized in that,
The upper portion of described shadow surface, lower quadrate part, by the setting of its curvature, penetrate the light ratio directional light that comes from described focus more upward.
3. headlight for automobile as claimed in claim 2, is characterized in that,
The face shape of described upper portion, described lower quadrate part is configured to: a side of the light penetrating via described lower quadrate part compares with the light penetrating via described upper portion, large with respect to the angle of directional light.
4. the headlight for automobile as described in claim 2 or 3, is characterized in that,
Curvature in the described upper portion of described shadow surface more approaches periphery and more diminishes.
5. the headlight for automobile as described in any one in claim 2 to 4, is characterized in that,
Curvature in the described lower quadrate part of described shadow surface more approaches periphery and more becomes large.
CN201310475741.0A 2012-10-12 2013-10-12 Vehicular headlamp Active CN103727475B (en)

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EP2719941A1 (en) 2014-04-16
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JP6095937B2 (en) 2017-03-15
CN103727475B (en) 2017-04-12

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