A comprehensive resource for safe and responsible laser use
It works by putting a standard pen-type laser pointer between two cams. Cranking a handle turns the cams which bounce the laser pointer up/down and left/right to create projected patterns:
By using different cam shapes, different patterns can be projected:
Instructions and plans are available online, including Thingiverse 3D printing files.
Stanford noted “At this point I think it is unlikely I will continue the project. But if I did, here’s what I could do:” He then listed adding blinds to make discontinuous patterns, making the device motor driven, and adding a web service to make it easier to create new cam patterns.
From Evan Stanford’s Hackaday.io page, posted in mid-June 2017
On July 24 2014, the Food and Drug Administration sent a letter to David Fleenor of Epic FX, Inc. of Phoenix, Arizona. It stated that videos posted on the epicfx.com website “documents audience scanning with Class IIIb and/or Class IV lasers. Although much of the audience scanning was done with fanned beams, your projector is not designed nor reported for safe audience scanning. Your variance prohibits audience scanning. Any laser beams projected into the audience directly or indirectly is considered audience scanning. This is in violation of Condition 5 of your variance.” [The page has since been removed, and returns a 404 error.]
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