Patent ID: 6324024
Filing Date: 2001-11-27
Classification: G01C,G02B

Abstract:
An electric distance metering system including a reflector, said system comprising:an electric distance meter, including a distance measuring system with a first light source emitting a light beam of a first wavelength range;a sighting telescope having an auto-focusing system, said auto-focusing system receiving light of a second wavelength range;a reflecting member which reflects back an incident light beam parallel to the direction of incidence;a selective transmission member provided to a light-incident surface of said reflecting member, said selective transmission member passing the light beam of the first wavelength range, while preventing the light of the second wavelength range from passing, said reflecting member and said selective transmission member preventing auto-focusing error by preventing a reflection in said second wavelength range of at least said electric distance meter from returning to said auto-focusing system, while permitting distance measurement by permitting a reflection in said first wavelength range of said light beam of said first wavelength range to return to said distance measuring system; anda focusable portion having a color of sharp contrast with respect to said reflector and a fixing member which affixes said selective transmission member with respect to said reflecting member, said sharp contrast being a sufficient amount of contrast such that said auto-focusing system focuses on said sharp contrast, said fixing member having said color in said second wavelength range of said sharp contrast with respect to said reflecting member.