Lens contamination preventive device of light-beam heater

Details Lens contamination preventive device of light-beam heater Lens contamination preventive device of light-beam heater

1997-02-19

1998-09-22

Nguyen, Thong

Optical: systems and elements

Protection from moisture or foreign particle

359808, 359894, 2191215, 21912168, G02B 718, B23K 902

Patent

active

058123148

ABSTRACT:
A lens contamination preventive device comprises a gas jetting device for jetting out gas and a gas suction device for suctioning gas which are disposed to face each other with respect to an optical axis of light emitted through a lens. The gas jetting device and the gas suction device are disposed so as to form a layer of gas jet stream in the vicinity of a surface of the lens. The gas jetting device has a gas jetting port, a width of which is greater than a diameter of the lens. The gas suction device has a rate of suction greater than a rate of jet from the gas jetting device.

REFERENCES:
patent: 3696230 (1972-10-01), Friedrich
patent: 4778693 (1988-10-01), Drozdowicz et al.
patent: 4987286 (1991-01-01), Allen

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