Polygon mirror, fan beam output device, and survey system

Patent metadata

Field	Value
Publication number	US-10488519-B2
Application number	US-201615267579-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 17, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A polygon mirror includes a plurality of reflection surfaces formed in a circumference surface of the polygon mirror at equal intervals, and a surface processed part that reflects incident laser light to form a fan beam spreading in a predetermined direction, and the surface processed part being provided in each of the reflection surfaces.

First claim

What is claimed is:

1. A fan beam output device comprising:
a polygon mirror comprising: a plurality of reflection surfaces formed in a circumference surface of the polygon mirror at equal intervals, and a surface processed part that reflects incident laser light to form a fan beam spreading in a predetermined direction, and the surface processed part being provided in each of the reflection surfaces;
a laser light source that emits laser light toward the reflection surface of the polygon mirror;
a collimator lens that changes the laser light emitted from the laser light source into parallel light flux;
a rotation driver that rotates the polygon mirror;
a rotation position detector that detects a rotation position of the polygon mirror; and
a light sending controller that controls on / off of the laser light source based on the rotation position detected by the rotation position detector,
wherein:
the light sending controller generates the fan beam spreading in a right and left direction from the surface processed part of a predetermined reflection surface of the reflection surfaces of the polygon mirror by controlling the on / off of the laser light source based on the rotation position of the polygon mirror, and
the fan beam scans in an up and down direction by the rotation of the polygon mirror.

2. The fan beam output device according to claim 1 , wherein
the surface processed part in at least one of the reflection surfaces includes a refractive diffraction grating or a lenticular lens.

3. The fan beam output device according to claim 1 further comprising:
at least three reflection surfaces of the reflection surfaces, wherein
in the surface processed part of at least one of the three reflection surfaces, direction of the spreading inclines relative to a rotation axis of the polygon mirror.

4. A survey system comprising:
a target device including: the fan beam output device according to claim 1 , a target that reflects incident tracking light along an incident direction, a display that displays a reference line indicating a previously set reference direction and an obtained target position, and a communication part; and
a survey instrument including: a guide light receiving part that receives the fan beam output from the fan beam output device, a tracking light receiving part that receives the tracking light reflected by the target to automatically track the target, a horizontal angle detector that detects a horizontal angle of the target relative to a horizontal reference line based on the light received by the tracking light receiving part, a distance measurement part that emits measurement light toward the target and receives the measurement light reflected by the target to obtain a distance to the target, a calculation controller that calculates a position of the target based on the distance obtained by the distance measurement part and the horizontal angle detected by the horizontal angle detector, and a communication part that sends data on the position of the target calculated by the calculation controller,
wherein:
the data is sent to the target device by the communication part, the sent data is received by the communication part of the target device, and a present position of the target is displayed on the display,
scanning in the up and down direction is provided in the survey instrument,
an angle of a survey instrument direction from the target to the survey instrument relative to a reference direction previously set on the display is obtained by the calculation controller based on a light receiving timing of each of the fan beams received by the guide light receiving part,
the data on the angle obtained by the calculation controller is sent by the communication part of the survey instrument,
the data on the angle is received by a receiving part of the target device, and
the reference line on the display is displayed in a position rotated at the angle.

Assignees

• Topcon Corp

Inventors

• Nishita Nobuyuki

Classifications

• G01S7/51

  Display arrangements · CPC title

• G01C15/006

  Detectors therefor · CPC title

• G01C15/00 Primary

  Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00 · CPC title

• G01S17/86

  Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders · CPC title

• G01S7/003

  Transmission of data between radar, sonar or lidar systems and remote stations · CPC title