The superposing optical system has a first superposing lens disposed between the second lens array and {HEAD ~ the color} separating and guiding {TAIL ~ optical system} and a second superposing lens having a convex lens included in the color separating and guiding optical system 
separating
The superposing optical system has a first superposing lens disposed between the second lens array and { HEAD ~ the color } separating and guiding { TAIL ~ optical system } and a second superposing lens having a convex lens included in the color separating and guiding optical system
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