AIR INJECTOR FOR PROTECTING LENS OF OPTICAL GAUGE

摘要

PURPOSE: An air injector injecting air to the front of a lens to secure a visual field of an optical gauge is provided to prevent foreign materials from being attached to the lens by rapidly discharging air injected to the front of the lens. CONSTITUTION: An air injector for preventing foreign materials from being attached on a lens(7) or on a protecting glass(6) by injecting air to the front of the lens or the glass of an optical gauge(9) is composed of a low-pressure air injecting unit installed to the front of the lens or the protecting glass to inject air and a high-pressure air injecting unit(100) installed to a front end of the low-pressure air injecting unit to inject air. Air injected from the low and high-pressure air-injecting units is bias injected in a reverse direction against a proceeding direction of light. The pressure of air injected from the high-pressure air-injecting unit is relatively larger than the pressure of air from the low-pressure air-injecting unit.