TWI447451B - Light pipe and light guiding device - Google Patents

Description

Light guide tube and light guiding device

The invention relates to a light guiding tube and a light guiding device having the light guiding tube, in particular to a light guiding tube with uniform luminous brightness and a light guiding device having the light guiding tube.

Light guide tubes are widely used in electronic devices such as computers and scanners. LEDs are widely used in light pipes because of their energy saving and small size.

However, the brightness of different color LEDs of the same model that consumers can buy is not the same. Therefore, different color LEDs of the same type cannot emit light of the same brightness, and light of different colors emitted by the light pipes of different color LEDs also have different brightnesses, directly reducing the performance of the light guiding device having the light guiding tube. The performance of the electronic device having the light guiding device is reduced. At the same time, if it is necessary to mix light, light of different brightness and different colors cannot be mixed with uniform white light.

In view of the above, it is necessary to provide a light guide tube that emits light of uniform brightness and a light guide device having the light guide tube.

A light guide tube includes an elongated body. The body includes a light exiting section and an incident light section connected to the light exiting section. The light exiting section has a light exiting surface. The light exiting surface is a portion of the radially outer surface of the light exiting section. The light pipe also has a plurality of branch pipes. The light incident segment is sequentially distributed with a plurality of interfaces along its axial direction. The distance from the complex interface to the end faces of the light incident segments is not equal. The plurality of interfaces are used to connect the body and the plurality of branch pipes.

A light guiding device includes a light guiding tube and a light source with different luminances. The light pipe includes an elongated body. The body includes a light exiting section and an incident light section connected to the light exiting section. The light exiting section has a light exiting surface. The light exiting surface is a portion of the radially outer surface of the light exiting section. The light pipe also has a plurality of branch pipes. The light incident segment is sequentially distributed with a plurality of interfaces along its axial direction. The distance from the complex interface to the end faces of the light incident segments is not equal. The plurality of interfaces are used to connect the body and the plurality of branch pipes. The light source with a larger luminance corresponds to the branch tube closer to the light exiting section, and the light source with less brightness corresponds to the branch tube farther away from the light exiting section, so that the light emitted by the light source with different luminances is introduced through different branch pipes. The body.

Compared with the prior art, the light guide tube provided by the present invention has a light exiting section and a plurality of branching tubes, so that light of different luminances can enter the body through different branching tubes and exit from the light emitting surface of the light exiting section, thereby When the light of different luminances is emitted from the light-emitting surface, the luminance is the same, and the light guiding device having the light guiding tube has a simple structure and a good light guiding effect.

10‧‧‧Light guide

12‧‧‧Light pipe

14, 16, 18‧‧‧ Light source

122‧‧‧ body

124‧‧‧First branch tube

126‧‧‧Second branch

128‧‧‧The third branch

1222‧‧‧Into the light segment

1223‧‧‧Lighting section

1224‧‧‧Glossy surface

1225‧‧‧reflecting surface

131‧‧‧First interface

132‧‧‧second interface

133‧‧‧ third interface

1226, 1227, 19‧‧‧reflective structure

1228‧‧‧Microstructure

1 is a schematic view of a light guiding device provided by an embodiment of the present invention, the light guiding device having a light guiding tube.

2 is a schematic view of the light pipe of FIG. 1.

Figure 3 is a cross-sectional view of Figure 2.

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2 , the light guiding device 10 includes a light guide tube 12 , a light source 14 , a light source 16 , and a light source 18 . In this embodiment, the light source 14, the light source 16, and the light source 18 are respectively a blue LED, a red LED, and a green LED, and the light source 14, the light source 16, and the light source 18 emit light. The brightness increases in turn.

The light pipe 12 includes an elongated body 122, a first branch pipe 124, a second branch pipe 126, and a third branch pipe 128.

The body 122 includes a light incident section 1222 and an light exiting section 1223 connected to the light incident section 1222. The light exiting section 1223 has a light emitting surface 1224 and a reflecting surface 1225 opposite to the light emitting surface 1224. The light exiting surface 1224 is a portion of the radially outer surface of the light exiting section 1223, and the reflecting surface 1225 is a radially outer surface opposite to the light emitting surface 1224. In this embodiment, the body 122 is a hollow tubular body, and the light-emitting surface 1224 has a U-shaped radial cross section to make the illumination range larger, and the reflective surface 1225 is a flat surface. Of course, the body 122 can also be a solid tubular body having a circular, square or semi-circular radial cross section, and is not limited to the embodiment, and can be determined according to actual conditions. Of course, the cross section of the reflective surface 1225 may also have other geometric shapes such as a U shape, a V shape, and the like, and is not limited to the embodiment, and may be determined according to actual needs.

The first optical interface, the second interface 132, and the third interface 133 are disposed on the end of the light-incident portion 1222. The first interface 131 is located closer to the light exiting section 1223, the third interface 132 is farther away from the light exiting section 1223, and the second interface 132 is located between the first interface 131 and the third interface 133.

The first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 are connected to the body 122 through the first interface 131, the second interface 132, and the main interface 133, respectively.

In this embodiment, the body 122, the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 are separately formed, and then integrally bonded by gluing and bonding, and the first branch pipe 124 and the second branch are integrally formed. Tube 126 and third branch tube 128 are both curved tubes.

Of course, the body 122, the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 may also be integrally formed.

Certainly, the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 may all be tubes of other shapes such as an S-shaped pipe and a V-shaped pipe. The present invention is not limited to this embodiment, and may be designed according to actual conditions. Of course, the shapes of the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 may also be different. Certainly, the number of the branches may be two, four or more, and is not limited to three in the embodiment, and may be determined according to actual conditions.

In order to prevent light entering the body 122 from exiting from the reflective surface 1225, the reflective surface 1225 is further provided with a reflective structure 1226, and the reflective structure 1226 is a reflective sheet.

Of course, the reflective structure 1226 can also be disposed on the radially inner tube wall of the light exiting section 1223 opposite to the light exiting surface 1224. Of course, the reflective structure 1226 can also be a reflective film.

In order to prevent light entering the body 122 from exiting from the other end of the body, the end of the other end of the body 122 is provided with a reflective structure 1227. In this embodiment, the reflective structure 1227 is a reflective sheet. Of course, the reflective structure 1227 can also be a reflective film.

In order to make the light entering the body 122 uniformly reflected from the radially inner tube wall of the light exiting portion 1223 opposite to the light emitting surface 1224 to the light emitting surface 1224, the light exiting portion 1223 is radially opposite to the light emitting surface 1224. A microstructure 1228 is also provided on the tube wall, and the microstructure 1228 is a plurality of protrusions.

Of course, the microstructure 1228 can also be covered with a reflective structure 1226, that is, the reflective structure 1226 covers the radially inner tube wall of the light exiting portion 1223 opposite to the light exiting surface 1224.

Of course, the microstructure 1228 can also be disposed on the reflective surface 1225. At this time, the reflective structure 1226 can of course be covered on the microstructure 1228.

Of course, the microstructure 1228 can also be a plurality of depressions.

The light source 14, the light source 16, and the light source 18 respectively correspond to the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128, so that the light emitted by the light source 14, the light source 16, and the light source 18 are respectively separated by the first branch pipe. 124. The second branch pipe 126 and the third branch pipe 128 are introduced into the body 122.

The light source 14 , the light source 16 , and the light source 18 enter the body 122 via the first branch tube 124 , the second branch tube 126 , and the third branch tube 128 that is further away from the light exit portion 1223 , respectively, and the light source 14 and the light source. The luminance of the light source 18 and the light source 18 are sequentially increased, so that the light emitted from the light source 14, the light source 16, and the light source 18 reaches the body 122 with the same luminance.

At the same time, in order to prevent the bent portions of the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 from leaking light, the first branch pipe 124, the second branch pipe 126, and the third branch pipe 128 are The bent portion is provided with a reflective structure 19. In this embodiment, the reflective structure 19 is a reflective sheet and is disposed on an outer surface of the bent portion. Of course, the reflective structure 19 can also be a reflective film. Of course, the reflective structure 19 can also be disposed on the inner surface of the bent portion.

Of course, it is also possible to have only one or two branching tubes bent portions provided with a reflecting structure.

Of course, if the light source 14, the light source 16, and the light source 18 in the light guiding device 10 are simultaneously turned on, the light guiding device 10 emits uniform white light; if the light source 14, the light source 16 and the light source 18 have only one light source or When the two light sources emit light, the light guiding device 10 emits light of different colors of the same brightness.

Of course, the number of the light sources in the light guiding device 10 may also be two, four or more, and the light color of the light source may also be other colors such as yellow and orange.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

12‧‧‧Light pipe

122‧‧‧ body

124‧‧‧First branch tube

126‧‧‧Second branch

128‧‧‧The third branch

1222‧‧‧Into the light segment

1223‧‧‧Lighting section

1224‧‧‧Glossy surface

1225‧‧‧reflecting surface

131‧‧‧First interface

132‧‧‧second interface

133‧‧‧ third interface

1226, 1227, 19‧‧‧reflective structure

1228‧‧‧Microstructure

12‧‧‧Light pipe

122‧‧‧ body

124‧‧‧First branch tube

126‧‧‧Second branch

128‧‧‧The third branch

1222‧‧‧Into the light segment

Claims (9)

A light guiding device includes a light guiding tube and a light source with different luminances; the light guiding tube comprises an elongated body, the body comprises a light exiting section and a light incident section connected to the light exiting section, the light emitting section The light-emitting surface has a portion of the radially outer surface of the light-emitting portion, wherein the light-guiding tube further has a plurality of branch tubes, and the light-in connecting portion is sequentially distributed with a plurality of interfaces along the axial direction thereof, and the plurality of interfaces are connected to the plurality of interfaces The distance between the end faces of the light entrance segments is different, and the plurality of interfaces are used for connecting the body and the plurality of branch pipes; the light source with a larger luminance corresponds to the branch pipe closer to the light exit segment, and the light source with less brightness is farther away The branch pipes of the light exiting section correspond to each other, so that light emitted by a light source having different luminances is introduced into the body through different branch pipes. The light guiding device of claim 1, wherein the radially outer surface of the light exiting section opposite to the light emitting surface is provided with a reflective structure, a microstructure or a microstructure, and a reflective structure covering the light emitting surface. The light guiding device of claim 1, wherein the body is a hollow tubular body, and the light exiting section has a U-shaped radial cross section. The light guiding device of claim 3, wherein the radially inner tube wall of the light exiting section opposite to the light emitting surface is provided with a microstructure, a reflective structure or a microstructure and a reflective structure covering the light emitting surface. The light guiding device of claim 1, wherein the body is a solid tubular body having a circular, square or semi-circular shape in cross section. The light guiding device of claim 1, wherein the body is provided with a reflective structure away from an end portion of the light incident section. The light guiding device of claim 1, wherein the plurality of branch tubes are arc tubes, and the bent portion of the at least one branch tube is provided with a reflective structure. The light guiding device of claim 1, wherein the body and the plurality of branch pipes are integrally formed. The light guiding device of claim 1, wherein the number of the light sources is three, and the three light sources are divided into three Do not emit blue light, red light and green light, and the blue light source has a small luminance, and the green light source has a large luminance. The red light source brightness is between the blue light source luminance and the green light source luminance, and the green light source is closer to the green light source. Corresponding to the branch pipe of the light exiting section, the blue light source corresponds to the branch pipe farther away from the light exiting section, and the red light source corresponds to the branch pipe corresponding to the blue light source and the branch pipe corresponding to the branching pipe corresponding to the green light source.