Target for surveying instrument

Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station

Reexamination Certificate

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Details

C356S003010, C356S004010, C356S005010, C356S141100

Reexamination Certificate

active

07130035

ABSTRACT:
A target for a surveying instrument, which receives from the surveying instrument a laser point light indicating a position and a distance measuring light to measure a distance, comprising a reflection diffusion layer for reflecting and diffusing the distance measuring light, a wavelength filter layer for selectively transmitting the laser point light passing through the reflection diffusion layer, and a transmission diffusion layer for spreading in a given direction and for transmitting the laser point light passing through the wavelength filter layer, wherein a projecting position of the laser point light can be confirmed.

REFERENCES:
patent: 3374044 (1968-03-01), Benson
patent: 4516264 (1985-05-01), Corvari et al.
patent: 5237446 (1993-08-01), Takahashi
patent: 5851740 (1998-12-01), Sawyer
patent: 5854709 (1998-12-01), Couzin
patent: 2001/0036013 (2001-11-01), Allen et al.
patent: 10-221073 (1998-08-01), None
patent: 11-083484 (1999-03-01), None

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