Focus Adjustment of Line Generators
The line generator lens assembly consists of two separate elements: aspherical lens assembly a, and cylindrical
lens assembly b.
Lens assembly a adjusts the coarse thickness of the line and lens assembly b adjusts the fine thickness of the line.
Figure (I): Line generator showing lens assembly
To focus the line at a given distance rotate lens assembly a, until you get the thinnest possible line.
Your line at this point may look the line in Fig (II), thick in the center and thin along the edges. To adjust
to a thin line focused line (Fig (III)), keep lens assembly a fixed and gently rotate lens assembly b
(making sure not to move lens assembly a during this process) until you get a thin uniform line as shown in
Fig (III). It will not be necessary to rotate b more than 90 degree (quarter turn).
(II) (III)
Figure (II): Magnified version of the line after adjusting lens assembly a
Figure (III): Focused line after adjusting lens assembly b
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