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KMID : 1011420160210040401
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 4 p.401 ~ p.407
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Design and Development of F-theta Lens for 1064 ㎚ Laser
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Lee Dong-Hee
Park Seung-Hwan
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Abstract
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Purpose: To design and develop the f-theta lens for 1064 ㎚ laser.
Methods: In order to design the f-theta lens that satisfies the user’s conditions which are the laser beam diameter of 15 ㎜, the image point diameter of 30 ㎛ or less, the optical system thickness within 70 ㎜, the working distance of about 295 ㎜, and the effective image diameter within about 260 ㎜, method of setting the galvanomirror driving angles to eight zoom modes was used.
Results: By optimizing for the galvanomirror driving angles set to the eight zoom modes, we could design the f-theta lens of which characteristics have the effective image diameter within about 260 ㎜, the sign of the refractive power constructed in order of (+) (?) (+) (+), the resolving line width of 18.8 lps/㎜ (@ 40% MTF), the focal length of about 254 ㎜, the working distance of about 295 ㎜, and the maximum galvanomirror driving angle of ±10.5˚.
Conclusions: In this study, by using the method to set the galvanomirror driving angles to multiple zoom modes for optimizing the f-theta lens design, we could easily design and manufacture the f-theta lens that satisfies user’s requirement.
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KEYWORD
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1064 ㎚ laser, F-theta lens, Marking machine, Galvanomirror, Distortion
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