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US 4,904,081 AGranted
Surveying apparatus
OwnerKenji Miyaharainventor
Life of this patent
Estimating the term…
Abstract
An surveying apparatus for a route survey including a laser oscillator incorporated in a subjective cylinder and adapted to direct a laser beam onto a target disposed in an objective cylinder to form a laser spot on the target so as to enable the curvature of a route to be measured by analyzing deviation of the laser spot on the target. The subjective and objective cylinders are connected by a joint means disposed in the middle between the laser oscillator and the target, thereby to improve measuring accuracy and durability.
Claims6
A surveying apparatus comprising:
- a subjective cylinder;
- an objective cylinder connected to said subjective cylinder;
- joint means connecting said subjective and said objective cylinders so as to be bendable relative to one another about said joint means;
- and
- measuring means for determining the angle at which said cylinders are bent relative to one another about said joint means,
- said measuring means including a laser oscillator means incorporated in said subjective cylinder for irradiating a laser beam in a predetermined direction, a target incorporated within said objective cylinder and positioned relative said laser oscillator means so as to be impingeable by laser beams irradiated by said laser oscillator means, image pickup means operatively associated with said target for detecting the location on the target at which a laser beam irradiated by said laser oscillator means impinges said target and for outputting a signal indicative of said location, and a control system operatively connected to said image pickup means for determining said angle by comparing said location to a reference position on said target, said joint means being disposed substantially midway between said laser oscillator means and said target.
3 more elements
Dependencies are inferred from the claim text.