Patent ID: 9223107
Filing Date: 2015-12-29
Classification: G02B

Abstract:
1. An adapter correcting for glass thickness attachably and detachably provided to a field lens comprising a lens barrel having a tubular shape and a plurality of lenses accommodated within the lens barrel, the field lens using the plurality of lenses to correct aberrations due to a glass plate having a predetermined thickness being interposed between the lens barrel and an object-side objective, the adapter correcting for glass thickness comprising: an adapter main body comprising: a translucent plane parallel plate having two mutually-parallel flat surfaces, the plane parallel plate positioned within the accommodator such that the two flat surfaces are orthogonal with respect to the optical axis of the field lens; and a retainer attached to an end of the accommodator closest to the objective, the retainer holding the plane parallel plate between the retainer and the tongue in a state where the plane parallel plate is positioned within the accommodator, and wherein the accommodator has tubular length configured to accommodate at least two plane parallel plates therein.