KR20160012491A - Lamp for vehicle - Google Patents

Abstract

Provided is a lamp for a vehicle and, more specifically, relates to a lamp for a vehicle which simplifies a structure thereof by allowing a fluorescent substance have a cutoff line shape of a beam pattern, enabling to easily form a beam pattern. According to an embodiment of the present invention, the lamp for a vehicle comprises: a plurality of excited light source which irradiates excited light; a fluorescence generation unit which is excited by the excited light, generating fluorescence, and has a shape of a beam pattern of which a fluorescence generation area desires to be shaped; and a lens which projects the generated fluorescence to the outside.

Description

Lamp for vehicle

The present invention relates to a lamp for a vehicle, and more particularly, to a lamp for a vehicle which can form a beam pattern easily while allowing a phosphor to have a cut-off line shape of a beam pattern.

2. Description of the Related Art [0002] Generally, a vehicle is equipped with various types of vehicle lamps having a lighting function for easily confirming an object located in the vicinity of the vehicle at nighttime, and a signal function for notifying other vehicle or road users of the running state of the vehicle.

For example, head lamps and fog lamps are mainly aimed at lighting functions, while turn signal lamps, tail lamps, brake lamps, side markers and the like are mainly used for signal functions. In addition, such vehicle lamps are prescribed by laws and regulations on installation standards and specifications so that each function can be fully utilized.

In recent years, studies have been actively conducted on the use of fluorescence generated by the excitation of a fluorescent substance by using a light emitting diode or a laser diode as a light source of a lamp for a vehicle and irradiating the fluorescent substance with excitation light generated from the light source It is progressing.

Since the laser diode is easy to converge without loss of light owing to its high luminance and strong directivity, it is possible to obtain high luminance and bright light as compared with a light emitting diode.

On the other hand, a vehicle lamp is required to form a beam pattern having a predetermined cut-off line in accordance with the purpose of use. For example, when a vehicle lamp forms a low beam pattern as a headlamp, So that the light is prevented from being irradiated to the upper side of the cutoff line.

However, in order to form a cut-off line of the beam pattern, an additional component such as a shield for shielding a part of the light emitted from the vehicle lamp is required, so that the overall configuration becomes complicated and the cost increases.

Accordingly, there is a demand for a method of easily forming a cut-off line of a beam pattern while simplifying the structure of a lamp for a vehicle.

Japanese Unexamined Patent Application Publication No. 2013-026163 (Feb.

A problem to be solved by the present invention is to provide a phosphor which excites by excitation light to generate fluorescence so as to have a cutoff line shape of a beam pattern, And to provide a vehicle lamp capable of forming a beam pattern.

Another object of the present invention is to provide a lamp for a vehicle that prevents degradation of the performance or lifetime of the phosphor due to heat generated when excitation light is focused on a specific region of the phosphor by irradiating the entire region of the phosphor with the excitation light.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a vehicle lamp according to an embodiment of the present invention includes a plurality of excitation light sources for emitting excitation light, excited by the excitation light to generate fluorescence, and a shape of a beam pattern to be formed by the fluorescence generation region And a lens for projecting the generated fluorescence to the outside.

Other specific details of the invention are included in the detailed description and drawings.

The vehicle lamp of the present invention has one or more of the following effects.

The excitation by the excitation light and the fluorescence emitting fluorescence have a cut-off line shape of the beam pattern to be formed, thereby eliminating the need for a separate component for blocking part of the light so as to form a cut-off line, It is possible to easily form the beam pattern.

In addition, when a plurality of excitation light sources are used, the excitation light is irradiated to the entire region of the phosphor, so that the excitation light is concentrated on a specific region of the phosphor, thereby preventing the degradation of the performance or lifetime of the phosphor.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 and 2 are schematic views showing a lamp for a vehicle according to an embodiment of the present invention.
FIGS. 3 and 4 are schematic diagrams illustrating a fluorescence generator according to an embodiment of the present invention; FIG.
5 is a schematic view showing a lamp for a vehicle according to another embodiment of the present invention;
6 is a schematic view showing an optical path adjusting section according to another embodiment of the present invention;
Figs. 7 and 8 are schematic views showing a lamp for a vehicle according to another embodiment of the present invention; Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well known process steps, well-known structures, and well-known techniques are not specifically described to avoid an undue interpretation of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is to be understood that the terms comprise and / or comprise are used in a generic sense to refer to the presence or addition of one or more other elements, steps, operations and / or elements other than the stated elements, steps, operations and / It is used not to exclude. And "and / or" include each and any combination of one or more of the mentioned items.

Further, the embodiments described herein will be described with reference to cross-sectional views and / or schematic drawings that are ideal illustrations of the present invention. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. In addition, in the drawings of the present invention, each component may be somewhat enlarged or reduced in view of convenience of explanation. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a vehicle lamp according to embodiments of the present invention.

1 and 2 are schematic diagrams showing a lamp for a vehicle according to an embodiment of the present invention.

The lamp 1 for a vehicle according to an embodiment of the present invention may include a plurality of excitation light sources 110, 120, and 130, a fluorescence generator 200, and a lens 300.

In the exemplary embodiment of the present invention, a plurality of excitation light sources 110, 120, and 130 may be laser diodes that emit laser light used as excitation light. However, the excitation light sources include not only laser diodes, (Bulb), and the like can be used.

When a laser diode is used as the plurality of excitation light sources 110, 120, and 130, the plurality of excitation light sources 110, 120, and 130 generate laser light in a blue region having a peak wavelength in a wavelength range of 440 nm to 490 nm However, the present invention is not limited to this. For example, the color gamut of the laser light may be varied according to the hue of light required by the vehicle lamp 1 or the hue of the fluorescent light to be generated by the fluorescence generator 200 .

In the embodiment of the present invention, the plurality of excitation light sources 110, 120, and 130 are spaced apart from each other and arranged in at least one direction, and when the plurality of excitation light sources 110, 120, and 130 generate excitation light in the same direction The arrangement directions and intervals of the excitation light sources 110, 120 and 130 or the direction of excitation light emission are not limited to the types of the vehicle lamp 1, the optical system, the layout, and the like. And can be variously changed.

The use of the plurality of excitation light sources 110, 120, and 130 in the embodiment of the present invention is for realizing roughness and light irradiation regions suitable for the beam pattern required in the vehicle lamp 1, The number of excitation light sources used depending on the pattern can be variously changed.

The fluorescence generator 200 may be composed of a phosphor excited by the excitation light generated from the plurality of excitation light sources 110, 120, and 130 to generate fluorescence of a predetermined color.

For example, when the automotive lamp 1 is a headlamp, since the white light is generally generated, the plurality of excitation light sources 110, 120, 130 may emit white light when laser light of a blue color region is emitted from the phosphor layer 130. The yellow phosphor may have a peak wavelength in the range of 560 nm to 590 nm.

In this case, in the embodiment of the present invention, the blue laser light is used as the plurality of excitation light sources 110, 120, and 130, and the yellow phosphor is used from the fluorescence generator 200. For example, The present invention is not limited to this, and it may be implemented by a combination of blue, green, and red phosphors depending on the color gamut of the excitation light source.

In addition, in the embodiment of the present invention, the fluorescence generating unit 200 will be described by way of example in which a transmissive phosphor is used. The transmissive phosphor is a phosphor in which fluorescence is generated in a direction of transmitting a phosphor when excitation light is incident Can be understood.

In the embodiment of the present invention, the transmission type fluorescent material is used for the fluorescence generating part 200, but this is merely an example for facilitating the understanding of the present invention. And a reflection type phosphor in which fluorescence is generated through a plane on which excitation light is incident according to a layout or the like.

At this time, the reflectance or transmittance of the phosphor may be varied depending on the composition ratio of the particles constituting the phosphor.

Meanwhile, in the embodiment of the present invention, the fluorescence-generating region of the fluorescence-generating unit 200 may have a shape corresponding to the beam pattern to be formed, and the fluorescence generated from the fluorescence-generating unit 200 is incident on the lens 300 So that light of a desired beam pattern can be irradiated.

For example, when a low beam pattern is to be formed by the fluorescence generating unit 200, a lower end portion may have a step shape so that the fluorescence generating region can form a cut-off line of the low beam pattern, If the beam pattern to be formed is changed, the shape of the fluorescence generating region of the fluorescence generating unit 200 may be variously changed.

In this case, when the beam pattern is formed through the fluorescence generated from the fluorescence generating unit 200, the size of the fluorescence generating region may be variously changed according to illumination or light irradiation region.

For example, if the vehicle lamp 1 is a headlamp, a beam pattern may be clearly formed, and the fluorescence generating region may have a size of 40% or less of the size of the lens 300 so that the optical loss can be reduced. However, The size of the fluorescent lamp 1 can be variously changed depending on the type of the lamp 1 for the vehicle, the beam pattern, the surrounding environment on which the vehicle travels, and the like, May also vary.

In the embodiment of the present invention, the distance d1 between the plurality of excitation light sources 110, 120, and 130 and the fluorescence generator 200 and the distance d2 between the fluorescence generator 200 and the lens 300 are 1 : 3. ≪ / RTI >

In the embodiment of the present invention, when d1: d2 is set to 1: 3, when the distance ratio is larger than 1: 3, the light amount decrease and the cutoff line are not sharp. When the distance ratio is smaller than 1: 3, This is because performance may be degraded.

Here, the case of forming d1: d2 at 1: 3 is described in the embodiment of the present invention, but this is merely an example for facilitating understanding of the present invention, and the present invention is not limited to this, 110, 120 and 130, the size or area of the fluorescence generator 200 or the lens 300, and the like.

As described above, in the embodiment of the present invention, since the fluorescence generator 200 is formed to have a shape corresponding to the beam pattern to be formed, a component such as a reflector or a shield for forming a cutoff line of the beam pattern is not required The configuration can be simplified and the cost can be reduced.

In the embodiment of the present invention, since the excitation light is irradiated to the entire region of the fluorescence generator 200 using the plurality of excitation light sources 110, 120, and 130, It is possible to improve the efficiency of the phosphor and reduce the lifetime.

In the embodiment of the present invention as described above, when the wide angles of the excitation light generated from the plurality of excitation light sources 110, 120, and 130 are all the same, the irradiation areas 110a and 120a irradiated to the fluorescence generator 200 And 130a may be all the same.

At this time, at least one excitation light source of the plurality of excitation light sources 110, 120, and 130 is inclined so that relatively more excitation light can be incident on the fluorescence generator 200 while forming a cut- As shown in FIG. 4, at least one of the irradiation areas 110a, 120a and 130a irradiated to the fluorescence generating part 200 is inclined so that the light loss is reduced to increase the roughness while forming a clear cut-off line, The far vision can be improved.

4, a case where the wide angle of the excitation light generated from one excitation light source 120 is inclined is described as an example. However, the present invention is not limited thereto, and the wide angle of at least one excitation light source may be inclined according to the cut- Can be.

In the embodiment of the present invention, the plurality of excitation light sources 110, 120, and 130 may be arranged at regular intervals, and the arrangement interval of the plurality of excitation light sources 110, 120, lt; RTI ID = 0.0 > zone. < / RTI >

For example, when the plurality of excitation light sources 110, 120, and 130 are disposed at a predetermined interval or more, the excitation light generated from the excitation light sources 110, 120, and 130 in the beam pattern is relatively Since a plurality of high illuminance areas with high illuminance are generated and it is difficult to secure the view of the driver, there is a possibility that the high illuminance area by the excitation light by the plurality of excitation light sources 110, 120, So as to be formed in the center portion.

For example, in the embodiment of the present invention, when a plurality of excitation light sources 110, 120, and 130 are disposed at intervals of 3 mm or less from each other, a high contrast region is formed at the central portion of the beam pattern The arrangement interval of the plurality of excitation light sources 110, 120, and 130 can be variously changed according to the type of the excitation light source, the excitation light generating area, the amount of the excitation light, and the like have.

In the exemplary embodiment of the present invention, a plurality of excitation light sources 110, 120, and 130 are used. However, in order to improve light utilization efficiency, a plurality of excitation light sources 110, 120, It is required to utilize all of the generated excitation light.

In other words, the excitation light generated from the plurality of excitation light sources 110, 120, and 130 has a predetermined wide angle. In this case, if the amount of light traveling out of the fluorescence generator 200 increases, It is necessary that the excitation light generated from the plurality of excitation light sources 110, 120, and 130 is irradiated to the possible fluorescence generator 200.

For example, each of the plurality of excitation light sources 110, 120, and 130 may have a predetermined light irradiation angle, and the light use efficiency for the excitation light generated from the plurality of excitation light sources 110, 120, It is preferable that a plurality of excitation light sources 110, 120, and 130 are positioned near the fluorescence generating unit 200 so that a light irradiation angle is included in the fluorescence generating region of the fluorescence generating unit 200.

In other words, the plurality of excitation light sources 110, 120, and 130 are spaced apart from each other such that the light irradiation area of each excitation light is included in the fluorescence generation area of the fluorescence generator 200 You can.

In the above-described embodiment, the case where a plurality of excitation light sources 110, 120, and 130 are positioned close to the fluorescence generator 200 to increase the light use efficiency is exemplified. However, the present invention is not limited to this, 110, 120, and 130 to adjust the optical path of the excitation light to increase the light use efficiency.

5, the excitation light is sufficiently irradiated to the entire region of the incidence surface of the fluorescence generator 200, and at the same time, incident light is incident on the incidence apertures 111a, 121a, 131a And a plurality of tubular optical path adjusting portions 111, 121 and 131 formed with the exit holes 111b, 121b and 131b are positioned between the plurality of excitation light sources 110, 120 and 130 and the fluorescence generating portion 200, respectively can do.

The plurality of optical path adjusting units 111, 121, and 131 can prevent the optical loss from being generated by adjusting the optical path so that the excitation light is reflected and propagated from the inner side.

In another embodiment of the present invention, the plurality of light path adjusting portions 111, 121, and 131 are formed so that the overall shape of each of the light outgoing ports 111b, 121b, and 131b is the same as the shape of the fluorescence generating region of the fluorescence generating portion 200 The excitation light is sufficiently irradiated to the fluorescence generator 200. However, the present invention is not limited to this, and may be applied to any one of the outgoing ports 111b, 121b, and 131b may be variously changed according to the cutoff line shape of the beam pattern to be formed.

6 illustrates an example in which the optical path adjusting units 111, 121, and 131 are used for the plurality of excitation light sources 110, 120, and 130, respectively. However, The present invention is not limited thereto and a single optical path adjusting section having the same incidence and exit aperture for the plurality of excitation light sources 110, 120, and 130 can be used. In this case, ) Of the fluorescence-generating region.

The lens 300 may function to project the fluorescence generated from the fluorescence generator 200 to the outside and effectively disperse the fluorescence, and an aspherical lens may be used to realize various lens characteristics.

7 and 8 are schematic diagrams showing a lamp for a vehicle according to another embodiment of the present invention.

1 and 2, the lamp 1 for a vehicle according to another embodiment of the present invention includes a plurality of excitation light sources 110, 120, and 130, a fluorescence generator 200, And a light guide 400 for guiding the excitation light generated from the plurality of excitation light sources 110, 120 and 130 to the fluorescence generator 200. [

In another embodiment of the present invention, the light guide 400 can guide the excitation light incident on the incident surface, that is, the rear surface, to the fluorescence generating unit 400, The cross-sectional shape of the light guide 400 may be different from that of the light guide 400, and the shape of the light guide 400 may be different from that of the light guide 400. In this case, 400 may have the same size as that of the fluorescence generator 200 or may have a larger size than the fluorescence generator 200 so that the excitation light is sufficiently irradiated to the fluorescence generator 200.

In another embodiment of the present invention, the cross-sectional size of the light guide 400 is formed to be smaller than the size of the lens 300, and when the cross-sectional size of the light guide 400 increases, It is possible to prevent light from proceeding from being generated, thereby reducing light loss.

In this embodiment of the present invention, the cross-sectional size of the light guide 400 is smaller than the size of the lens 300, which means that at least one of the width or the width that determines the cross- It can be understood that it is formed not to deviate from the incident surface area.

In the embodiments of the present invention as described above, the case where a plurality of optical path adjusting units 111, 121, and 131 are used and the case where the optical guide 400 is used are separately described. However, And a plurality of optical path adjusting units 111, 121, and 131 and a light guide 400 may be applied to the embodiments of the present invention.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110, 120, 130: excitation light source
111, 121, 131: Optical path adjustment section
200: fluorescence generator
300: lens
400: light guide

Claims (15)

A plurality of excitation light sources for emitting excitation light;
A fluorescence generating part excited by the excitation light to generate fluorescence, and having a shape of a beam pattern to be formed by the fluorescence generating area; And
And a lens for projecting the generated fluorescence to the outside. The method according to claim 1,
Wherein the plurality of excitation light sources include:
Wherein the fluorescent lamp is located apart from the fluorescent light generating unit at an interval such that a light irradiation area by each of the excitation light sources is included in the fluorescent light generating area. The method according to claim 1,
The fluorescent-
Wherein the beam pattern has a cut-off line shape. The method according to claim 1,
Wherein at least one of the plurality of excitation light sources comprises:
Wherein the beam pattern is inclined at a predetermined angle in accordance with a cut-off line shape of the beam pattern. The method according to claim 1,
Further comprising at least one optical path adjusting section for adjusting the optical path of the excitation light generated from the plurality of excitation light sources to be directed to the fluorescence generating section. 6. The method of claim 5,
Wherein the at least one optical path adjustment unit comprises:
And the excitation light incident on the incidence aperture is reflected from the inner side surface and emitted to the exit port. The method according to claim 6,
In this case,
And the shape of the fluorescence generation region. The method according to claim 1,
The fluorescent-
A lamp for a vehicle comprising a transmissive phosphor. The method according to claim 1,
And a light guide for guiding the excitation light to the fluorescence generating portion. 10. The method of claim 9,
The cross-sectional shape of the light guide,
The lamp having the same shape as that of the fluorescence generating portion. 10. The method of claim 9,
The cross-sectional size of the light guide,
Wherein the fluorescent lamp is formed in the same or larger size as the fluorescent lamp. 10. The method of claim 9,
The cross-sectional size of the light guide,
Wherein the size of the lens is smaller than the size of the lens. The method according to claim 1,
Wherein the plurality of light sources comprises:
A lamp for a vehicle, wherein the lamp is disposed with an interval of 3 mm or less. The method according to claim 1,
Wherein the fluorescence generation region comprises:
And a size of 40% or less of the lens size. The method according to claim 1,
Wherein a ratio of a distance from the plurality of excitation light sources to the fluorescence generating portion and a distance from the fluorescence generating portion to the lens is 1: 3.

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