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Lenses are used in optical systems for beam convergence, beam expansion, imaging and collimation. According to the structure of the lens, it can be roughly divided into single lens (including: plano-convex, plano-concave, double-convex, double-concave, cylindrical, drum, spherical and other different shapes), cemented lens, combined lens group and other different types.
1. Prism angle accuracy: conventional ≤ 3'-6', unconventional ≤ 1'-2', parallel ≤ 0.003mm. Among them, the ridge angle and cube can be controlled to ≤2", and the ridge angle can reach ≤1". 2. Dimensional tolerance: controlled within ±0.02mm. 3. Tower difference: The angle of tower difference is generally controlled at 3′, and the minimum can reach 1′ or better. 4. Surface shape (aperture): mass production can reach λ/4, λ/8, λ/10 or better. 5. The dimensional tolerance of the slot can be controlled to ±0.05mm.