# US 4,671,654 A · Automatic surveying apparatus using a laser beam

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,671,654 A
- Document ID: US4671654A
- Status: Granted
- Kind: A
- Application number: 06/612,560
- Filed: 1984-05-21
- Granted: 1987-06-09
- Earliest claimed: 1983-05-21
- Assignees: Mac, LLC
- Inventors: Kenji Miyahara; Hisashi Sakiyama
- Web page: https://patentgrep.com/patent/US4671654A

## CPC

- G01S 5/16: using electromagnetic waves other than radio waves
- G01C 15/002: {Active optical surveying means (optical plumbing G01C15/105)}
- G01S 17/86: Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)

## Abstract

An automatic surveying apparatus for surveying a route in tunneling work, for example, by directing a laser beam from a laser device onto a screen of a moving target to form a laser spot on the screen and detecting the positional coordinates of the laser spot on the screen by means of an image pick-up camera to obtain the positional deviation of the target with high accuracy. The angular deflections of the target can also be measured by use of a target composed of two screens and two image pick-up cameras.

## Claims

### Claim 1

An automatic surveying apparatus using a laser beam, comprising a laser device adapted to radiate a laser beam and installed at a datum point for surveying, and a moving target having at least one projection screen upon which the laser beam from said laser device forms a laser spot and an optical processing system adapted to take the laser spot formed on said projection screen and to detect the positional coordinates of the laser spot on the projection screen, whereby a positional deviation of the target relative to the laser device is automatically measured on the basis of the positional coordinates detected by the optical processing system.

### Claim 2 (depends on 1)

An automatic surveying apparatus as set forth in claim 1, wherein the optical processing system includes at least one image pick-up camera.

### Claim 3 (depends on 1)

An automatic surveying apparatus as set forth in claim 1, further comprising an optical distance-measuring device which is mounted on the laser device for projecting a light beam onto a reflective target attached to the moving target so as to measure the distance between said laser device and said moving target.

### Claim 4 (depends on 3)

An automatic surveying apparatus as set forth in claim 3, further comprising a processing unit adapted to detect the displacement of the laser spot in terms of X-Y coordinates relative to the origin on the projection screen and issue control signals, and a tracking device adapted to drive the laser device in response to the control signals from said processing unit with movement of the moving target.

### Claim 5

An automatic surveying apparatus using a laser beam, comprising a laser device adapted to radiate a laser beam and installed at a datum point for surveying, and a moving target having at least one projection screen upon which the laser beam from said laser device forms a laser spot and an optical processing system adapted to take the laser spot formed on said projection screen and to detect the positional coordinates of the laser spot on the projection screen, whereby a positional deviation of the target relative to the laser device is automatically measured on the basis of the positional coordinates detected by the optical processing system;
wherein the moving target comprises two projection screens disposed at a fixed distance and in parallel to each other and the optical processing system comprises two image pick-up cameras for taking the laser spots which are formed on the respective projection screens by directing the laser beam from the laser device onto the screens, whereby the positional deviation and angular deflections of said moving target relative to said laser device are measured.