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LASER SAFETY INTERLOCK

IP.com Disclosure Number: IPCOM000022860D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 214K

Publishing Venue

Xerox Disclosure Journal

Abstract

A laser safety interlock is provided whereby a light emitting diode 1 emits a light beam 2 in a given band to a photodetector 3, which is sensitive only to the band emitted by the diode, to maintain a solenoid in a shutter- open position out of the path of a laser beam. The diode and detector are located within an enclosure of a copying machine, The beam path between the diode and the photo- detector includes a reflector 4 located on a cover 5 for the enclosure, When the cover is removed, the reflector is also removed breaking the beam path between the detector and the diode whereby the solenoid is deactuated to allow a spring to return the shutter to a closed positions It is necessary that the photodetector be sensitive only to the band emitted by the diode since the detector will be exposed to other light when the cover is opens

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XEROX DISCLOSURE JOURNAL

LASER SAFETY INTERLOCK Proposed Classification
3. Spowart U,S~ Cl~ 70/Digest 51
Into Cl, E05b

A laser safety interlock is provided whereby a light
emitting diode 1 emits a light beam 2 in a given band to
a photodetector 3, which is sensitive only to the band
emitted by the diode, to maintain a solenoid in a shutter-
open position out of the path of a laser beam. The diode
and detector are located within an enclosure of a copying
machine, The beam path between the diode and the photo-
detector includes a reflector 4 located on a cover 5 for
the enclosure, When the cover is removed, the reflector
is also removed breaking the beam path between the detector
and the diode whereby the solenoid is deactuated to allow
a spring to return the shutter to a closed positions It
is necessary that the photodetector be sensitive only to
the band emitted by the diode since the detector will be
exposed to other light when the cover is opens

Volume 1 Nunther 3 March 1976

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