| US 7,386,215 B1 | ||
| Projection system and light tunnel thereof | ||
| Kuang-Hua Chang, Taipei (Taiwan); Chih-Huang Wang, Taipei County (Taiwan); Jie-Hyi Chang, Taipei Hsien (Taiwan); Shiau-Wu Lai, Taipei County (Taiwan); Kai Hsiung Tsao, Taipei (Taiwan); Guang-Yu Yu, Taipei County (Taiwan); and Wen-Hu Wang, Taipei (Taiwan) | ||
| Assigned to Prodisc Technology Inc., Taipei Hsien (Taiwan) | ||
| Filed on Mar. 30, 2007, as Appl. No. 11/729,788. | ||
| Claims priority of application No. 95149599 A (TW), filed on Dec. 28, 2006. | ||
| Int. Cl. G02B 6/00 (2006.01); G02B 5/126 (2006.01); G03B 21/00 (2006.01) | ||
| U.S. Cl. 385—133 [385/134; 359/535; 353/122] | 16 Claims |
| 1. A light tunnel, comprising:
a first optical element having a first recess;
a second optical element, which is disposed opposite to the first optical element and has a second recess;
a third optical element, which connects the first optical element with the second optical element and has one end disposed
in the first recess or the second recess; and
a fourth optical element, which is disposed opposite to the third optical element, connects the first optical element with
the second optical element, and has one end disposed in the first recess or the second recess, wherein inner surfaces of the
first optical element, the second optical element, the third optical element and the fourth optical element form a light passage,
the first recess has a concave portion disposed adjacent to the end of the third optical element or the fourth optical element.
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