Laser blocking shutter

Details Laser blocking shutter Laser blocking shutter

1983-04-21

1985-06-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350275, G01D 536

Patent

active

045242712

ABSTRACT:
There is disclosed herein a shutter particularly useful in blocking laser energy, such as for an Nd:YAG laser used for laser surgery. The shutter includes a metal plate which is rotatable about an axis, and the metal plate has a series of substantially evenly spaced holes therethrough. A plastic ring is disposed on one surface of the plate and has a like series of holes. The holes allow radiation to pass through the plate and ring, and the sections of the plate and ring intermediate the holes block such radiation. The plate/ring is mounted within a housing and a shaft so that this assembly can be manually or automatically rotated. The housing includes a hole therethrough with which any one of the holes in the plate/ring may be aligned to allow the laser beam to pass. The shutter assembly may have a switch or other suitable sensor for sensing the position of the plate to indicate and insure that a hole (or a section between holes) of the plate and plastic ring is aligned with the hole in the housing.

REFERENCES:
patent: 3750049 (1973-07-01), Dowley et al.
patent: 3942878 (1976-03-01), Engel et al.
patent: 4004146 (1977-01-01), Blunck

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