| 摘要 |
An optical projection system used for enlargement projection of an image frame in a two-dimensional display element (P) on a screen (Sb), comprising a first mirror (M1) having negative power on its reflection face and a second mirror (M2) having its reflection face on a light path from the two-dimensional display element to the reflection face of the first mirror, wherein the first mirror (M1) and the second mirror (M2) are disposed on an identical base plate with the first mirror (M1) and the second mirror (M2) being capable of adjusting inclination.
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