| 摘要 |
A projector comprises a light source unit, a light guide element, a first focus element, a second focus element, a micromirror element and an image unit. The light source unit provides a light beam. The first focus element comprises a first focal length f<SUB>1</SUB>. The second focus element comprises a second focal length f<SUB>2</SUB>, wherein <maths id="MATH-US-00001" num="00001"> <MATH OVERFLOW="SCROLL"> <MROW> <MN>2.0</MN> <MO><</MO> <MFRAC> <MSUB> <MI>f</MI> <MN>2</MN> </MSUB> <MSUB> <MI>f</MI> <MN>1</MN> </MSUB> </MFRAC> <MO><</MO> <MROW> <MN>3.6</MN> <MO>.</MO> </MROW> </MROW> </MATH> </MATHS> The light beam travels from the light source unit, passing the light guide element, the first focus element, the second focus element and the micromirror element to the image unit.
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