CN111947102A

CN111947102A - Light guide end structure for preventing light guide end bright spots

Info

Publication number: CN111947102A
Application number: CN202010952852.6A
Authority: CN
Inventors: 杨丹; 刘飞; 朱楠; 张欢
Original assignee: HASCO Vision Technology Co Ltd
Current assignee: HASCO Vision Technology Co Ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-11-17

Abstract

The invention relates to a light guide end structure for preventing light guide end bright spots, wherein rack-shaped patterns are arranged on the end surface of a light guide; in the rack-shaped patterns, the length direction of a single rack is along the height direction of the light guide; the plurality of racks are parallel to each other and arranged one by one in order in the thickness direction of the light guide. The invention can lead the light to form refraction or reflection at different angles on the dentate patterns at different angles, lead the light out from the emergent end, and lead the light out to be absorbed by parts such as a lamp body and the like instead of penetrating out from the front, thereby effectively preventing the formation of bright spots and optimizing the appearance; meanwhile, no extra cost is added, and other performance problems are not brought.

Description

Light guide end structure for preventing light guide end bright spots

Technical Field

The invention relates to a light guide, in particular to a light guide end structure for preventing bright spots at the end of the light guide.

Background

In the design of modern car lamp, the problem of bright spots of optical parts such as thick walls, light guides and the like of many lamps exists at the light-emitting tail end, so that the lighting effect is uneven, the appearance is influenced, and meanwhile, the user experience can cause great adverse effects. In order to solve the problem of the bright spots, the problem of the bright spots is solved by increasing a modeling shielding area in the prior art, which causes great limitation to the modeling of the whole lamp, and the problem that the lamp often has scaling due to the fact that a continuous penetration effect between two lamps is difficult to realize; or by locally applying a black paint to the end of the optical element to form a light absorption, the problem of bright spots is solved, but this requires additional mask, i.e. increased cost, and in addition, the light absorption area absorbs heat, which causes local temperature rise, which causes problems with a fused yellow lamp, and is likely to cause complaints after sale.

Disclosure of Invention

In order to solve the problems, the invention makes the light ray exit end be provided with the dentate pattern, the light ray forms refraction or reflection at different angles on the dentate pattern at different angles, so that the light ray is led out from the exit end, and the led light ray is absorbed by parts such as a lamp body and the like instead of penetrating out from the front, thereby effectively preventing the formation of bright spots.

The invention adopts the following technical scheme:

a light guide end structure for preventing light guide end bright spots, the end face of the light guide is provided with rack-shaped patterns; in the rack-shaped patterns, the length direction of a single rack is along the height direction of the light guide; the plurality of racks are parallel to each other and arranged one by one in order in the thickness direction of the light guide.

Preferably, the light guide is used for a vehicle lamp, and the thickness direction is a vehicle front-rear direction.

Preferably, the angle between adjacent racks of said rack-like pattern is 45-60 °.

Further, the tooth surface of the rack-like pattern has an angle of 45 to 60 ° with the front-rear direction.

Preferably, the end face of the light guide is planar.

Preferably, the end face of the light guide is an arc-shaped face.

Preferably, the light guide is square or circular in cross-section.

Preferably, the incident end of the light guide is in a straight form or in a form having an angle with the length direction of the light guide.

Preferably, the tooth crest width of the rack is less than or equal to 0.5mm, and the tooth height is less than or equal to 1.5 mm.

The invention has the beneficial effects that: the light can be refracted or reflected at different angles on the dentate patterns at different angles, so that the light is led out from the emergent end, and the led-out light is absorbed by parts such as a lamp body and the like instead of penetrating out from the front, thereby effectively preventing the formation of bright spots and optimizing the appearance; meanwhile, no extra cost is added, and other performance problems are not brought.

Drawings

FIG. 1 is a front view of an automotive light guide in the present invention.

Fig. 2 is a top view of an automotive light guide in the present invention.

Fig. 3 is a partial structure enlarged view of the incident end in fig. 2.

Fig. 4 is a partial structure enlarged view of the exit end in fig. 2.

Fig. 5 is a partial schematic view of the exit end of a toothless pattern in the prior art.

Fig. 6 is a front view of a circular light guide.

Fig. 7 is a cross-sectional view of a circular light guide and its holder.

Fig. 8 is a schematic view of a direct-illumination thick-walled lighting pattern.

Fig. 9 is a schematic illustration of a combined light emitting form of a light guide and thick walls.

FIG. 10 is a schematic representation of a form of light emission using a mirror in combination with a light guide.

FIG. 11 is a schematic illustration of the principle of light refraction and reflection for the exit end of the light guide of the present invention.

Fig. 12 is a detail view showing the rack portion of fig. 11.

Fig. 13 is a further detail display view in fig. 12.

In the figure, 1, a lamp body, 2, a light guide, 3, refraction light, 4, reflection light, 5, incident light, 6, emergent light, 7, a human eye observation sensitive angle (0-outer 60 degrees of front view is a bright spot sensitive area), 8, refraction light is irradiated to an absorption surface at the rear end of the lamp body through a refraction surface, 9, reflection light is irradiated to an absorption surface at the front end of the lamp body through a refraction surface, and 10, a safety surface.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1-4, and 11-13, a light guide end structure for preventing hot spots at the end of a light guide, the end face of the light guide being provided with a rack-like pattern; in the rack-shaped patterns, the length direction of a single rack is along the height direction of the light guide; the plurality of racks are parallel to each other and arranged one by one in order in the thickness direction of the light guide.

In this embodiment, referring to fig. 1 to 2, the light guide is used for a vehicular lamp, and the thickness direction is the vehicle front-rear direction.

In this embodiment, the angle between adjacent racks in the rack-like pattern is preferably 45-60 °, see fig. 13.

In this embodiment, and with continued reference to FIG. 13, the rack-like patterned tooth surfaces are preferably angled 45-60 to the fore-aft direction.

It should be noted that the shape of the end of the light guide is not particularly limited, and may be a plane or an arc. Further, the cross-section of the light guide is also not particularly required, and may be square, circular, or the like, as shown in fig. 6 to 7.

It should be noted that the incident end of the light guide may be in a direct form, as shown in fig. 8; or may be angled with respect to the length of the light guide as shown in figures 2-3.

In this embodiment, the light is refracted at different angles on the tooth-like patterns at different angles, so that the light is guided out from the exit end, as shown in fig. 4, and the guided light is absorbed by the lamp body and other parts, rather than passing out from the front, as shown in fig. 5. Therefore, the formation of bright spots is effectively prevented.

In this embodiment, referring to FIG. 13, the width of the tooth top of the rack is less than or equal to 0.5mm, and the height of the tooth is less than or equal to 1.5 mm. The security surface 10 is associated with the light emitting surface trend incidence angle, designated by the light emitting surface and the incidence angle, and in this embodiment, is preferably 45 ° to 60 °.

Because the modeling angles are different, the included angle of the dentate patterns is not a definite numerical value, and needs to be adjusted according to the actual effect. Referring to fig. 12, the security face is associated with a square face trend angle of incidence, preferably in the range of 45-60, although there is still very little reflected light emitted through the security face at a large angle, but no gross speckle is produced.

Finally, it should be noted that the present invention is not only applied to the square thick wall, such as the circular light guide form shown in fig. 6 and 7, the direct thick wall luminous form shown in fig. 8, the light guide + thick wall luminous form shown in fig. 9, and the reflector + thick wall luminous form shown in fig. 10, which are examples of other forms respectively, but the present invention is not limited to these structures, and the effect of solving the bright spots can be achieved by adding the tooth-like pattern described in the present application as long as the light-emitting end surface has a surface capable of reflecting light.

In conclusion, the invention can lead the light to form refraction or reflection at different angles on the dentate patterns at different angles, lead the light out from the emergent end, lead the light out to be absorbed by parts such as a lamp body and the like instead of penetrating out from the front, effectively prevent the formation of bright spots and optimize the appearance; meanwhile, no extra cost is added, and other performance problems are not brought.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made thereto without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A light guide end structure for preventing hot spots at the end of a light guide, comprising: the tail end face of the light guide is provided with rack-shaped patterns; in the rack-shaped patterns, the length direction of a single rack is along the height direction of the light guide; the plurality of racks are parallel to each other and arranged one by one in order in the thickness direction of the light guide.

2. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the light guide is used for a vehicle lamp, and the thickness direction is the vehicle front-rear direction.

3. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the angle between adjacent racks of the rack-like pattern is 45-60 degrees.

4. The light guide end structure for preventing hot spots at the end of a light guide according to claim 3, wherein: the tooth surface of the rack-shaped pattern forms an included angle of 45-60 degrees with the front and back direction.

5. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the end face of the light guide is planar.

6. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the end face of the light guide is an arc-shaped face.

7. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the light guide is square or circular in cross-section.

8. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the incident end of the light guide is in a direct form or in a form having an angle with the length direction of the light guide.

9. The light guide end structure for preventing hot spots at the end of a light guide according to claim 1, wherein: the tooth top width of the rack is less than or equal to 0.5mm, and the tooth height is less than or equal to 1.5 mm.