JP2014170630A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture comprising a reflector constituted by a translucent member, capable of achieving uniform light emission by light guided in an inner part of the reflector even in a case where the translucent member is formed to extend along a concave surface.SOLUTION: In the vehicular lighting fixture, a light reflection region 30r to which light reflection treatment is applied is formed in a front face 30a of a reflector 30 constituted by a translucent member extending along a concave surface, and light from a light source 20 is reflected toward the front of the lighting fixture. The reflector 30 includes: a light incident part 34 on which the light from the light source 20 is made incident so as to be guided to a light guide path 32 between a rear face 30b of the reflector 30 and the light reflection region 30r; and a light emission part 36 for emitting the light guided through the light guide path 32 toward the front of the lighting fixture. In addition, a light control element 38 for internally reflecting the light guided through the light guide path 32 as diffused light is formed on the light incident part 34. Accordingly, local concentration of light at the middle of the light guide is prevented from occurring.

Description

  The present invention relates to a vehicular lamp that includes a reflector made of a translucent member.

  2. Description of the Related Art Conventionally, as a vehicular lamp including a reflector that reflects light from a light source toward the front of the lamp, one in which the reflector is configured by a translucent member is known.

  “Patent Document 1” describes such a vehicular lamp in which the front surface of the reflector is subjected to a light reflection process so that the front surface is configured as a light reflection region.

  And in this "patent document 1", as a structure of a reflector, a light incident part that makes light incident from a light source so as to be guided to a light guide path between a rear surface and a light reflection region, and a light guide path thereof are described. A light emitting unit that emits light guided toward the front of the lamp is described.

JP 2010-40484 A

  In the vehicular lamp as described in the above-mentioned “Patent Document 1”, when the translucent member constituting the reflector is formed so as to extend along the concave curved surface, the light source incident on the inside of the reflector There is a tendency for the light from the light to be collected locally during the light guiding.

  When such a local condensing phenomenon occurs, the amount of light reaching each position of the light emitting part varies greatly, so that when the reflector is observed from the front, the light emitting part emits light uniformly. There is a problem that it cannot be made visible.

  Such a problem is a problem that may occur in the same manner even when the light from a second light source different from the light source is configured to enter the inside of the reflector.

  The present invention has been made in view of such circumstances, and in a vehicular lamp provided with a reflector composed of a translucent member, the translucent member is formed to extend along a concave curved surface. Even if it is a case, it aims at providing the vehicle lamp which can implement | achieve uniform light emission by the light guide | induced inside the reflector.

  The present invention is intended to achieve the above object by devising the configuration of the reflector.

That is, the vehicular lamp according to the present invention is
In a vehicle lamp comprising a light source and a reflector that reflects light from the light source toward the front of the lamp,
The reflector is composed of a translucent member formed so as to extend along the concave curved surface,
At least a part of the front surface of the reflector is configured as a light reflection region subjected to a light reflection process,
The reflector includes a light incident portion that allows light from the light source to enter the light guide path between the rear surface of the reflector and the light reflection region, and forwards the light guided through the light guide path. And a light control element for internally reflecting the light guided through the light guide path as diffused light.

  The type of the “light source” is not particularly limited.

  The above-mentioned “light incident part” is not particularly limited in specific configuration and arrangement as long as light from the light source can be incident so as to be guided to the light guide path.

  The above-mentioned “light emitting part” is not particularly limited as long as the light guided through the light guide path can be emitted toward the front of the lamp.

  The above-mentioned “light control element” is not particularly limited in specific configuration and arrangement as long as the light guided through the light guide path can be internally reflected as diffused light. , Configurations with multiple grooves and dots, configurations with multiple fisheye or cylindrical diffuse reflection elements, configurations with graining, white coating, etc. It is.

  As shown in the above configuration, the vehicular lamp according to the present invention is composed of a translucent member formed so that the reflector that reflects the light from the light source toward the front of the lamp extends along the concave curved surface. In addition, since at least a part of the front surface is configured as a light reflection region that has been subjected to light reflection processing, a required light distribution pattern is obtained by reflecting light from the light source toward the front of the lamp in the light reflection region. Can be formed.

  In addition, the reflector includes a light incident portion that allows light from the light source to enter the light guide path between the rear surface and the light reflection region, and the light guided through the light guide path to the front of the lamp. Since the light emitting unit that emits light and the light control element that internally reflects the light guided through the light guide path as diffused light are provided, the following operational effects can be obtained.

  That is, when the light from the light source incident on the reflector is guided through the light guide path, it is internally reflected as diffused light by the light control element, so that it is locally condensed during the light guide. It is possible to prevent the occurrence of the phenomenon. Therefore, it is possible to prevent the amount of light reaching each position of the light emitting portion from greatly varying. Thus, when the reflector is observed from the front, the light emitting portion can be seen to emit light uniformly.

  As described above, according to the present invention, in the vehicular lamp including the reflector composed of the translucent member, even when the translucent member is formed to extend along the concave curved surface, Uniform light emission by light guided through the inside of the reflector can be realized.

  In the above configuration, if the light control element is formed at the light incident portion, the formation area of the light control element is kept small, and the occurrence of a local light condensing phenomenon in the middle of light guiding is prevented in advance. can do.

  At that time, as the light incident part, a configuration including a light transmission part that makes light from the light source enter the inside of the reflector, and an inner surface reflection part that internally reflects light incident from the light transmission part toward the light guide path In addition, if the light control element is formed on the inner reflection portion, more light from the light source is incident on the inside of the reflector. Occurrence of a light phenomenon can be prevented in advance.

  In the above configuration, if the light control element is formed on the rear surface of the reflector and / or the light reflection region, the light incident on the inside of the reflector can be guided and reflected internally as diffused light. Occurrence of a local light condensing phenomenon during light guiding can be easily prevented.

  In the above configuration, if the concave curved surface is formed of a rotating paraboloid focusing on a point near the light source, a required light distribution pattern can be accurately formed by reflected light from the light reflecting region of the reflector. Is possible. When such a configuration is adopted, a local light condensing phenomenon in the middle of light guide tends to occur in a region along an intersection line of the paraboloid of revolution and a plane including its central axis. Therefore, if the light control element is formed in a region along the intersection line, it is easy to generate a local light condensing phenomenon in the middle of light guide while keeping the formation range of the light control element small. Can be prevented.

  In the above configuration, the light from the light source is guided to the light guide path between the rear surface of the reflector and the light reflecting region. However, the light from the second light source different from the light source (that is, the first light source) is used. Even in the case where the light is guided to the light guide path between the rear surface of the reflector and the light reflection region, there may be a phenomenon that the light is locally condensed during the light guide.

  Therefore, even when such a configuration is adopted, if the configuration includes a light control element that internally reflects light from the second light source guided through the light guide path as diffused light as the reflector, When light from the two light sources is guided, it is internally reflected as diffused light by the light control element, so that it is possible to prevent the phenomenon that light is locally collected during the light guide. can do.

Side sectional view which shows the vehicle lamp which concerns on 1st Embodiment of this invention. FIG. 1 is a view taken in the direction of the arrow II in FIG. Detailed view of part III in Fig. 1 The same figure as FIG. 3 which shows the 1st modification of the said 1st Embodiment. The same figure as FIG. 2 which shows the 2nd modification of the said 1st Embodiment. The same figure as FIG. 2 which shows the 3rd modification of the said 1st Embodiment. Side sectional view which shows the vehicle lamp which concerns on 2nd Embodiment of this invention. The VIII direction arrow directional view of FIG. 7 which shows the principal part of the vehicle lamp which concerns on the said 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, a first embodiment of the present invention will be described.

  FIG. 1 is a side sectional view showing a vehicular lamp 10 according to the present embodiment. FIG. 2 is a view taken in the direction of the arrow II in FIG. 1, showing the main part of the vehicular lamp 10.

  As shown in these drawings, the vehicular lamp 10 according to the present embodiment is a lamp having a function as a headlamp, and is a transparent translucent cover 14 attached to a lamp body 12 and a front end opening thereof. The light source 20 and the reflector 30 are incorporated in the lamp chamber formed by

  The light source 20 is a light emitting diode that emits white light, and is supported by the light source support member 22 with its light emitting surface facing downward. The light source support member 22 is supported by the lamp body 12.

  The reflector 30 is composed of a translucent member (specifically, a colorless and transparent resin member) formed so as to extend along the concave curved surface. At this time, the concave curved surface is constituted by a rotating paraboloid P having a point near the light source 20 (for example, a light emission center of the light source 20) A as a focal point and an axis extending in the front-rear direction of the lamp as a central axis Ax.

  The front surface 30a of the reflector 30 is subjected to light reflection processing by aluminum vapor deposition or the like in a region other than the upper edge, and the portion subjected to the light reflection processing transmits light from the light source 20 to the front of the lamp. A light reflection region 30r that reflects the light is configured. The light reflecting region 30r is composed of a plurality of reflecting elements 30s formed using the paraboloid P as a reference surface.

  The vehicular lamp 10 according to the present embodiment forms a headlamp light distribution pattern by synthesizing the light distribution patterns formed by the reflected light from the respective reflective elements 30s.

  The reflector 30 includes a light incident part 34 that allows light from the light source 20 to enter the light guide path 32 between the rear surface 30b and the light reflection region 30r, and the light guided through the light guide path 32. And a light emitting portion 36 that emits the light forward.

  FIG. 3 is a detailed view of part III in FIG.

  As shown in the figure, the light incident part 34 is formed to be curved and extend in the horizontal direction with a wedge-shaped vertical cross-sectional shape at substantially the same height as the light emitting surface of the light source 20. The light incident portion 34 includes a light transmitting portion 34A that allows light from the light source 20 to enter the interior of the reflector 30, and an inner surface reflecting portion 34B that internally reflects light incident from the light transmitting portion 34A toward the light guide path 32. And.

  The light transmission part 34A is configured by an upper end edge part of the front surface 30a of the reflector 30 (that is, a part not subjected to light reflection processing). The light transmission part 34A has a vertical cross-sectional shape slightly inclined backward, and thereby makes the light from the light source 20 enter the reflector 30 with almost no refraction. On the other hand, the inner surface reflecting portion 34B has a vertically cross-sectional shape that is greatly inclined forward, so that most of the light incident from the light transmitting portion 34A is internally reflected by total reflection.

  The light incident portion 34 is formed with a light control element 38 that internally reflects light guided through the light guide path 32 as diffused light. The light control element 38 is composed of spherical concave portions formed at a plurality of locations on the inner surface reflection portion 34B, whereby light incident from the light transmission portion 34A and reaching the light control element 38 is forward and backward. In addition, the light is diffusely reflected in the left-right direction.

  As shown in FIGS. 1 and 2, the light emitting portion 36 is configured by the front end face of the reflector 30.

  In the present embodiment, since the translucent member constituting the reflector 30 is formed so as to extend along the paraboloid P, if the light control element 38 is not formed in the light incident portion 34, As shown by a two-dot chain line in FIG. 2, the light guided through the light guide path 32 undergoes local condensing phenomenon while repeating internal reflection at the rear surface 30b and the light reflection region 30r, and thus the reflector. The light condensing region Z is generated at the lower center position of 30. Then, when a local light condensing phenomenon occurs in the middle of light guide in this way, the amount of light reaching each position of the light emitting portion 36 varies greatly, and when the reflector 30 is observed from the front, the light emission is performed. It becomes impossible to make the part 36 appear to emit light uniformly.

  Actually, since the light control element 38 is formed in the light incident portion 34, the light guided through the light guide path 32 becomes diffused light, and a local light collecting phenomenon occurs during the light guide. This will be prevented beforehand.

  Next, the effect of this embodiment is demonstrated.

  The vehicular lamp 10 according to the present embodiment includes a reflector 30 that reflects light from the light source 20 toward the front of the lamp, and includes a translucent member formed so as to extend along the concave curved surface. Since the area excluding the upper edge at 30a is configured as a light reflection area 30r subjected to light reflection processing, the light reflection area 30r reflects light from the light source 20 toward the front of the lamp. It is possible to form a light distribution pattern.

  In addition, the reflector 30 is guided through the light guide path 32 and the light incident part 34 that allows the light from the light source 20 to enter the light guide path 32 between the rear surface 30b and the light reflection region 30r. The light emitting part 36 that emits the emitted light toward the front of the lamp and the light control element 38 that internally reflects the light guided through the light guide path 32 as diffused light are provided. Can be obtained.

  That is, when light from the light source 20 incident on the inside of the reflector 30 is guided through the light guide path 32, it is locally reflected as diffused light by the light control element 38, thereby locally It is possible to prevent the phenomenon of light condensing from occurring. Therefore, it is possible to prevent the amount of light reaching each position of the light emitting portion 36 from being greatly varied. As a result, when the reflector 30 is observed from the front, the light emitting portion 36 can be seen to emit light uniformly.

  As described above, according to the present embodiment, in the vehicular lamp 10 including the reflector 30 formed of a light transmissive member, the light transmissive member is formed to extend along the concave curved surface. In addition, uniform light emission by the light guided through the reflector 30 can be realized.

  In addition, in the present embodiment, since the light control element 38 is formed in the light incident portion 34, a local light collection phenomenon during light guiding occurs while the formation area of the light control element 38 is kept small. Can be prevented in advance.

  At that time, the light incident portion 34 makes the light from the light source 20 incident on the inside of the reflector 30, and the internal reflection that internally reflects the light incident from the light transmissive portion 34 A toward the light guide path 32. Since the light control element 38 is formed on the inner surface reflection portion 34B, more light from the light source 20 is incident on the inside of the reflector 30, Occurrence of a local light condensing phenomenon during light guiding can be prevented in advance.

  In the present embodiment, since the concave curved surface is constituted by the rotating paraboloid P having the point A near the light source 20 as a focal point, the light distribution for the headlamp is performed by the reflected light from the light reflecting area 30r of the reflector 30. The pattern can be formed with high accuracy.

  In the said 1st Embodiment, it is also possible to set it as the structure by which the light reflection process by aluminum vapor deposition etc. was performed to the inner surface reflection part 34B in the light-incidence part 34 of the reflector 30. FIG. By doing in this way, the light from the light source 20 incident from the light transmission part 34A can be reliably reflected on the inner surface by the inner reflection part 34B.

  In the first embodiment described above, a light emitting diode is used as the light source 32. However, other types of light sources may be used.

  In the first embodiment, the light source 32 is described as a single light source. However, a configuration including a plurality of light sources 32 is also possible.

  Next, a modification of the first embodiment will be described.

  First, a first modification of the first embodiment will be described.

  FIG. 4 is a view similar to FIG. 3 and showing a relevant part of the vehicular lamp according to the present modification.

  As shown in the figure, the vehicular lamp according to this modification has the same basic configuration as that of the first embodiment, but the first embodiment is that the additional reflector 140 is disposed. It is different from the case of form.

  The additional reflector 140 is disposed on the front side of the light source 32, and reflects light directed forward from the light source 32 toward the light incident portion 34 of the reflector 30 on the reflection surface 140 a. The reflected light from the additional reflector 140 is also incident on the inside of the reflector 30 from the light transmitting portion 34A of the light incident portion 34, and is internally reflected toward the light guide path 32 by the inner surface reflecting portion 34B. The inner surface reflected light is diffused by the light control element 38.

  By adopting the configuration of this modification, the amount of light from the light source 32 that reaches the light emitting unit 36 can be increased. As a result, when the reflector 30 is observed from the front, the light emitting portion 36 can appear to emit light more uniformly and brightly.

  Next, a second modification of the first embodiment will be described.

  FIG. 5 is a view similar to FIG. 2, showing a main part of the vehicular lamp according to this modification.

  The vehicular lamp according to this modification has the same basic configuration as that of the first embodiment, but the configuration of the reflector 230 is different from that of the first embodiment.

  That is, the basic configuration of the reflector 230 of the present modification is the same as that in the first embodiment, but the arrangement and configuration of the light control element 238 are different from those in the first embodiment.

  Specifically, in this modification, a light control element 238 is formed on the rear surface 230b of the reflector 230 instead of the light control element 38 of the first embodiment.

  The light control element 238 has a region along the intersection line L between the rotary paraboloid P (see FIG. 1) and the vertical plane including the central axis Ax (specifically, a vertically long strip having the intersection line L as the center). The region is composed of a plurality of grooves formed in a vertical stripe pattern.

  Even in the case of adopting the configuration of this modification, the light from the light source 20 that has entered the light incident portion 234 of the reflector 230 is diffused by the light control element 238 when guided through the light guide path 232. By being internally reflected as light, it is possible to prevent a phenomenon in which light is locally collected during the light guide. As a result, it is possible to prevent the amount of light reaching each position of the light emitting portion 236 from greatly fluctuating, and the light emitting portion 236 appears to emit light uniformly when the reflector 230 is observed from the front. Can be.

  At this time, since the light reflection region 230r of the reflector 230 is formed with the rotating paraboloid P focusing on the point A in the vicinity of the light source 20 as a reference plane, the local light condensing phenomenon in the middle of the light guide is exchanged. The light control element 238 according to the present modification is formed in the region along the intersection line L, so that the formation range is kept small and the light is being guided. It is possible to easily prevent the occurrence of a local light condensing phenomenon.

  Next, a third modification of the first embodiment will be described.

  FIG. 6 is a view similar to FIG. 2 showing the main part of the vehicular lamp according to this modification.

  The vehicular lamp according to this modification has the same basic configuration as that of the first embodiment, but the configuration of the reflector 330 is different from that of the first embodiment.

  The basic structure of the reflector 330 of this modification is the same as that of the first embodiment, but the arrangement and configuration of the light control elements 338 are different from those of the first embodiment.

  That is, in this modification, the light control element 338 is formed on the rear surface 330 b of the reflector 330 instead of the light control element 38 of the first embodiment. At this time, the light control element 338 is formed by applying an embossing process to the entire area of the rear surface 330 b of the reflector 330.

  Even in the case of adopting the configuration of this modified example, the light from the light source 20 that has entered the light incident portion 334 of the reflector 330 is diffused by the light control element 338 when guided through the light guide path 332. By being internally reflected as light, it is possible to prevent a phenomenon in which light is locally collected during the light guide. As a result, the amount of light reaching each position of the light emitting portion 336 is prevented from greatly varying, and the light emitting portion 336 appears to emit light uniformly when the reflector 330 is observed from the front. Can be.

  Note that the light control element 338 is not formed in the entire region of the rear surface 330b of the reflector 330 as in the present modification, but is configured in a partial region (for example, a region along the intersection line L). It is also possible.

  Moreover, it is also possible to set it as the structure formed by giving white coating instead of setting it as the structure formed by giving a texturing like the light control element 338 of this modification. Furthermore, it is also possible to form a light control element by applying a white coating on the front surface of the reflector 330 as an undercoat when performing a light reflection process such as aluminum vapor deposition.

  Next, a second embodiment of the present invention will be described.

  FIG. 7 is a side sectional view showing the vehicular lamp 410 according to the present embodiment. FIG. 8 is a view taken in the direction of arrow VIII in FIG. 7 showing the main part of the vehicular lamp 410.

  As shown in these drawings, the vehicular lamp 410 according to the present embodiment has the same basic configuration as that of the third modification of the first embodiment, but the configuration of the reflector 430 is the above. The second modification is different from the third modification, and the first light source 420 corresponding to the light source 20 of the third modification and a plurality of second light sources 450 are provided as light sources. This is different from the case of the third modification.

  In the reflector 430 of the present embodiment, the entire area of the front surface 430a is configured as a light reflecting area 430r, and the light from the first light source 420 is reflected toward the front of the lamp in the light reflecting area 430r. Yes.

  In addition, the reflector 430 guides the light guide path 432 and the light incident part 434 that causes the light from each second light source 450 to enter the light guide path 432 between the rear surface 430b and the light reflection region 430r. A light emitting part 436 for emitting the emitted light toward the front of the lamp. At this time, the configuration of the light emitting portion 436 is the same as that of the third modified example, but the light incident portion 434 is formed to extend in the horizontal direction as the upper end surface of the reflector 430.

  The plurality of second light sources 450 are spaced apart from each other in the vicinity of the upper portion of the light incident portion 434 of the reflector 430. Each of the plurality of light sources 450 is a light emitting diode that emits white light, and is supported by a common light source support member 452 with its light emitting surface facing the light incident portion 434.

  Also in the present embodiment, as in the case of the third modified example, the light control element 438 is formed by applying a texture to the entire area of the rear surface 430b of the reflector 430.

  Next, the effect of this embodiment is demonstrated.

  Also in this embodiment, the light from the first light source 420 is reflected toward the front of the lamp in the light reflection region 430r of the reflector 430, so that a headlamp light distribution pattern can be formed.

  In addition, in the present embodiment, the light from each of the second light sources 450 that has entered the reflector 430 is internally reflected as diffused light by the light control element 438 when guided through the light guide path 432. By doing so, it is possible to prevent the phenomenon in which the light from the plurality of second light sources 450 is locally condensed in the course of light guiding. Therefore, it is possible to prevent the amount of light reaching each position of the light emitting unit 436 from greatly varying. As a result, when the reflector 430 is observed from the front, the light emitting portion 436 can be seen to emit light uniformly.

  In the present embodiment, the plurality of second light sources 450 may be configured to be turned on simultaneously with the first light source 420 that is turned on in the headlamp lighting mode, or a different lighting mode (for example, a clearance lamp lighting mode). It may be configured to light up.

  In this embodiment, instead of or in addition to the light control element 438, a light control element may be formed in the light incident portion 434 of the reflector 430.

  In the present embodiment, the light from the plurality of second light sources 450 is directly incident on the reflector 430 from the light incident portion 434. However, the light from the single or plural second light sources 450 is used. It is also possible to adopt a configuration in which the light is incident on the inside of the reflector 430 from the light incident portion 434 via a reflector, a light guide, an optical fiber, or the like.

  Note that the numerical values shown as specifications in the first and second embodiments and the modifications thereof are merely examples, and it is needless to say that these may be set to different values as appropriate.

  The invention of the present application is not limited to the configurations described in the first and second embodiments and the modifications thereof, and configurations with various other changes can be adopted.

DESCRIPTION OF SYMBOLS 10,410 Vehicle lamp 12 Lamp body 14 Translucent cover 20, 350 Light source 30, 230, 330, 430 Reflector 22, 352, 452 Light source support member 30a, 430a Front surface 30b, 230b, 330b, 430b Rear surface 30r, 230r, 430r Light reflection region 30s Reflective element 32, 232, 332, 432 Light guide path 34, 234, 334, 434 Light incident part 34A Light transmission part 34B Inner surface reflection part 36, 236, 336, 436 Light emission part 38, 238, 338, 438 Light control element 140 Additional reflector 140a Reflecting surface 420 First light source 450 Second light source A Point near light source Ax Center axis L Intersecting line P Paraboloid Z Condensing region

Claims (6)

In a vehicle lamp comprising a light source and a reflector that reflects light from the light source toward the front of the lamp,
The reflector is composed of a translucent member formed so as to extend along the concave curved surface,
At least a part of the front surface of the reflector is configured as a light reflection region subjected to a light reflection process,
The reflector includes a light incident portion that allows light from the light source to enter the light guide path between the rear surface of the reflector and the light reflection region, and forwards the light guided through the light guide path. A vehicular lamp, comprising: a light emitting portion that emits light toward the light source; and a light control element that internally reflects light guided through the light guide path as diffused light.   The vehicular lamp according to claim 1, wherein the light control element is formed in the light incident portion. The light incident portion includes a light transmission portion that causes light from the light source to enter the interior of the reflector, and an inner surface reflection portion that internally reflects light incident from the light transmission portion toward the light guide path. And
The vehicular lamp according to claim 2, wherein the light control element is formed in the inner surface reflection portion.   The vehicular lamp according to any one of claims 1 to 3, wherein the light control element is formed on a rear surface of the reflector and / or the light reflection region. The concave curved surface is composed of a rotating paraboloid focusing on a point near the light source;
The said light control element is formed in the area | region along the intersection of the said paraboloid and the plane containing the central axis of this paraboloid, The any one of Claims 1-4 characterized by the above-mentioned. Vehicle lamps. In a vehicular lamp including a first light source and a reflector that reflects light from the first light source toward the front of the lamp,
The reflector is composed of a translucent member formed so as to extend along the concave curved surface,
At least a part of the front surface of the reflector is configured as a light reflection region subjected to a light reflection process,
A second light source different from the first light source,
A light incident portion for allowing the light from the second light source to enter the light guide path between the rear surface of the reflector and the light reflection region; and light guided through the light guide path. A vehicular lamp, comprising: a light emitting portion that emits light toward the front of the lamp; and a light control element that internally reflects light guided through the light guide path as diffused light.

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