Patent ID: 9304249
Filing Date: 2016-04-05
CPC Classification: G02B,G03B,Y10T

Claim Text:
1. A light tunnel for use in an optical projection system, comprising: a plurality of reflecting plates, including a top reflecting plate, a bottom reflecting plate, a right reflecting plate and a left reflecting plate, each said reflecting plate being disposed between and connected to the other two said reflecting plates, so that a light passage with a hollow structure is defined by said plurality of reflecting plates; wherein said left reflecting plates has a first surface, a second surface, a third surface and a fourth surface, wherein said first surface is in an inclined structure, said first surface is obliquely connected to said third surface and said fourth surface, said second surface is opposite to said first surface and vertically connected to said third surface and said fourth surface, said third surface is opposite to said fourth surface, one of a vertical connection edge of said second surface and said third surface is abutted against said bottom reflecting plate, said left reflecting plate is disposed between and obliquely connected to said top reflecting plate and said bottom reflecting plate for forming said light passage having a non-rectangular cross section, and said first surface of said left reflecting plate is abutted against said top reflecting plate to form a junction with no gap between said first surface of said reflecting plate and said top reflecting plate.