WIDE-ANGLE COLLIMATING INDICATOR Russian patent published in 2009 - IPC G02B27/18 G02B27/01 

FIELD: physics; optics.

SUBSTANCE: proposed indicator contains a cathode ray tube (CRT), a two-component lens, between the components of which there is a flat reflecting mirror, breaking the optical surface, and a two-component semitransparent inclined mirror. The first component is made from the first negative, second positive and third plane-convex lens. The second component is made from the fourth positive lens-meniscus, the concave surface of which faces the mirror, the convex surface of which is parabolic. Between the second and third lenses there is a plane-parallel plate, stuck to the third lens and containing a beam-splitting plane inclined to the axis of the CRT, facing the lower end of the CRT. Under the plate there is fifth positive lens, a right-angle prism with a reflecting hypotenuse edge, a sixth positive lens, seventh convex-plane lens, on the flat surface of which a target reticule is put, located in the focal plane of an extra indicator channel, consisting of the six lens, right-angle prism, fifth lens, lower part of the plane-parallel plate, third lens, reflecting mirror and the fourth lens. Behind the convex surface of the seventh lens there is the eighth plane-convex lens, two illuminating lamps and spherical mirror. Ratios given in the formula of invention are satisfied in the indicator.

EFFECT: more reliable operation of the device.

3 dwg