Patent ID: 6469777
Filing Date: 2002-10-22
Classification: G01C

Abstract:
A surveying instrument comprising:a distance-measuring optical system having an objective lens via which a distance from said surveying instrument to an object is measured; and an optical distance meter which includes a reflection member positioned behind said objective lens, a light-transmitting optical system for transmitting a measuring light toward said object via said reflection member and said objective lens, and a light-receiving optical system for receiving a portion of said measuring light which is reflected by said object, subsequently passed through said objective lens and not interrupted by said reflection member; wherein said light-receiving optical system comprises a plurality of light-guiding optical systems, so that said measuring light which is reflected by said object is selectively incident on an end of one of said plurality of light-guiding optical systems in accordance with said distance from said surveying instrument to said object; and wherein a diameter of at least one light-guiding optical system of said plurality of light-guiding optical systems, to which said measuring light reflected by said object is incident on, is greater as the object distance for which said at least one light-guiding optical system is used is longer.