laser presentation system using a laser pointer us patent #6761456 nicolas brown oct. 10, 2014 us...
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Laser Presentation System Using a Laser Pointer
US Patent #6761456
Nicolas BrownOct. 10, 2014
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Problem Statement
Use of laser pointers during presentations presents a safety hazard if inadvertently directed towards the audience
Devise some way of disabling the laser when pointed away from the projector screen
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Prior Art (1)
Proposed Solution: Only turn on the laser when it’s point at something bright (i.e. the projection screen)
Disadvantage: Hard to calibrate, easy to fool
Japanese Patent Application 2000-321530
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Prior Art (2)
Proposed Solution: IR emitter placed on top of the projection screen; IR receiver on tip of laser pointer
Disadvantage: Emitted IR light could reflect off of audience, enabling the laser in their direction
Japanese Patent No. 2591667
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Patent Design (1)
Proposed Solution: Laser (30) will only emit light when sensor (32) is illuminated by IR emitter (50) on projector (20)
Issued: July 2004
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Patent Design (2)
What if the laser is flipped over??
No problem! Shutter will fall into place due to gravity when laser is inverted
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Patent Design (3)
Other Variants:
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Does this Problem Exist? According to medical literature: No…
“An ordinary laser pointer is safe, unless a user chooses to stare at its uncomfortable brilliant light for more than 10 seconds at close range” (Mainster et. al., 2004)
“In conclusion, laser pointers … if used appropriately are not an eye hazard, and even if used inappropriately will not cause permanent eye damage” (Marshall, 1998)
A 34 y/o male who stared into a 5 mW, 670 nm laser for 30-60 seconds suffered detectable macular injury but no loss in visual acuity (Luttrull and Hallisey, 1999)