LIGHT PIPE AND PROTECTING APPARATUS UTILIZING THE LIGHT PIPE
A light pipe comprises a solid light guiding portion and a hollow light guiding portion. The solid light guiding portion includes a receiving end and an output end, receives a light beam at the receiving end, and transmits the light beam to the output end via total reflection. The hollow light guiding portion includes a hollow output end. The hollow light guiding portion is combined with the output end of the solid light guiding portion in a combination part. The hollow light guiding portion receives the light beam from the output end, and transmits the light beam to the hollow output end via total reflection.
1 . A light pipe, comprising:
a solid light guiding portion, including a receiving end and an output end, for receiving a light beam at the receiving end, and for transmitting the light beam to the output end via total reflection; and
a hollow light guiding portion, including a hollow output end, wherein the hollow light guiding portion is combined with the output end of the solid light guiding portion in a combination part, where the hollow light guiding portion receives the light beam from the output end, and transmits the light beam to the hollow output end via total reflection.
2 . The light pipe of claim 1 , wherein the hollow output end is not combined with another solid light guiding portion.
3 . The light pipe of claim 1 , wherein a cross-section area of the solid light guiding portion at the combination part is smaller than which of the hollow light guiding portion.
4 . The light pipe of claim 3 , wherein a length of the solid light guiding portion is larger than which of the hollow light guiding portion.
5 . The light pipe of claim 4 , wherein the length of the hollow light guiding portion is for light to reflect more than two times in the hollow light guiding portion.
6 . The light pipe of claim 3 , wherein a length of the solid light guiding portion is smaller than which of the hollow guiding portion.
7 . The light pipe of claim 1 , wherein a cross-section area of the solid light guiding portion at the combination part is larger than which of the hollow light guiding portion.
8 . The light pipe of claim 7 , wherein a length of the solid light guiding portion is smaller than which of the hollow guiding portion.
9 . The light pipe of claim 1 , wherein a cross-section area of the solid light guiding portion at the combination part equals to which of the hollow light guiding portion.
10 . A projecting apparatus, comprising:
a light source module, for generating a light beam;
a light pipe, comprising:
a solid light guiding portion, including a receiving end and an output end, for receiving a light beam at the receiving end, and for transmitting the light beam to the output end via total reflection; and
a hollow light guiding portion, including a hollow output end, wherein the hollow light guiding portion is combined with the output end of the solid light guiding portion in a combination part, where the hollow light guiding portion receives the light beam from the output end, and transmits the light beam to the hollow output end via total reflection; and
a image generator, for receiving the light beam from the hollow light guiding portion to generate an image.
11 . The projecting apparatus of claim 10 , wherein the image generator directly receives the light beam from the hollow light guiding portion.
12 . The projecting apparatus of claim 10 , wherein the light source module includes a focusing light source module.
13 . The projecting apparatus of claim 10 , wherein a cross-section area of the solid light guiding portion at the combination part is smaller than which of the hollow light guiding portion.
14 . The projecting apparatus of claim 13 , wherein a length of the solid light guiding portion is larger than which of the hollow light guiding portion.
15 . The projecting apparatus of claim 14 , wherein the length of the hollow light guiding portion is long enough for light to reflect for more than two times in the hollow light guiding portion.
16 . The projecting apparatus of claim 13 , wherein a length of the solid light guiding portion is smaller than which of the hollow guiding portion.
17 . The projecting apparatus of claim 10 , wherein a cross-section area of the solid light guiding portion at the combination part is larger than which of the hollow light guiding portion.
18 . The projecting apparatus of claim 17 , wherein a length of the solid light guiding portion is smaller than which of the hollow guiding portion.
19 . The projecting apparatus of claim 10 , wherein a cross-section area of the solid light guiding portion at the combination part equals to which of the hollow light guiding portion.