Position determining apparatus

• US 7,022,962 B2
• Filed: 01/09/2003
• Issued: 04/04/2006
• Est. Priority Date: 01/21/2002
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Topcon
• Original Assignee: Kabushiki Kaisha Topcon
• Inventors: Ohtomo, Fumio, Hayashi, Kunihiro
• Primary Examiner(s): Allen, Stephone B.
• Application Number:
  US10/338,705
• Publication Number:
  US 20030136901A1
• Time in Patent Office: 1,181 Days
• Field of Search: 250/206.1, 250/206.2, 356/139.1, 356/139.07, 356/141.1, 356/141.3, 356/152.1, 356/152.2
• US Class Current: 250/206.1
• CPC Class Codes: G01C 15/004 Reference lines, planes or sectors
• CPC Class Codes: G01S 1/7038 Signal details
• CPC Class Codes: G01S 3/789 using rotating or oscillating beam systems, e.g. using mirrors, prisms

Abstract

The present invention provides a position determining apparatus that has a simplified configuration adapted to produce a horizontal reference plane and an inclined reference plane simultaneously. A position determining apparatus (100) according to the present invention comprises a rotary laser apparatus (151) that emits at least two fan-shaped laser beams diverting in a plane other than horizontal plane while rotating the laser beams about a given optical axis, and an optical sensor (154) that has at least one light receiving section receiving the fan-shaped laser beams. One of the fan-shaped laser beams is different in inclination angle from the other, and in terms of a state of the laser beams received at the light receiving section, a relative position of the optical sensor to the rotary laser apparatus can be determined.

Claims

1. An apparatus for determining positions, comprising:

(a) a rotary laser apparatus for emitting two or more fan-shaped laser beams, said rotary laser apparatus including a laser projector and a rotary unit rotating relative to said laser projector, wherein;

said laser projector has;

(1) a first laser illuminator for emitting a first linearly polarized laser beam;

(2) a second laser illuminator for emitting a second linearly polarized laser beam;

(3) a first polarized beam splitter for directing the laser beams emitted from said first laser illuminator and said second laser illuminator in the same direction; and

(4) a first one-quarter wave plate for converting said first and second linearly polarized laser beams from said first polarized beam splitter into circularly polarized laser beams; and

said rotary unit has;

(1) a second one-quarter wave plate for converting the circularly polarized laser beams from said first one-quarter wave plate into linearly polarized laser beams;

(2) a second polarized beam splitter for splitting the linearly polarized laser beams from said second one-quarter wave plate;

(3) a third one-quarter wave plate for converting the laser beams split and reflected by said second polarized beam splitter into circularly polarized laser beam;

(4) a first cylinder mirror for converting the circularly polarized laser beam from said third one-quarter wave plate into a first fan-shaped laser beam and reflecting back and emitting said fan-shaped laser beam through said third one-quarter wave plate and said second polarized beam splitter;

(5) a fourth one-quarter wave plate for converting laser beams transmitted through said second polarized beam splitter into a circularly polarized laser beam; and

(6) a second cylinder mirror for converting said circularly polarized laser beam from said fourth one-quarter wave plate into a second fan-shaped laser beam and reflecting back and emitting said second fan-shaped laser beam through said fourth one-quarter wave plate and said second polarized beam splitter; and

(b) optical sensor means for receiving the fan-shaped laser beams to determine a position.

2. An apparatus for determining positions according to claim 1, wherein said rotary unit further includes a deflecting prism between said third one-quarter wave plate and said first cylinder mirror and said rotary laser apparatus emits three fan-shaped laser beams.

3. An apparatus for determining positions according to claim 1, wherein said fist and second cylinder mirrors are oriented so that the first and second fan-shaped laser beams emitted from said rotary laser apparatus are inclined relative to the horizontal plane respectively.

4. An apparatus for determining positions according to claim 1, wherein said rotary laser apparatus emits fan-shaped laser beams of different polarized direction by 90°

.

5. An apparatus for determining positions according to claim 1, wherein said rotary laser apparatus emits fan-shaped laser beams modulated into different frequencies to distinguish these fan-shaped laser beams.

6. An apparatus for determining positions according to claims 1, wherein said rotary laser apparatus emits fan-shaped laser beams of different wavelengths to distinguish the fan-shaped laser beams.

7. An apparatus for determining positions according to claim 1, wherein said optical sensor further includes a GPS (global positioning system) position sensor that detects the relative position of said optical sensor to said rotary laser apparatus.

8. An apparatus for determining positions, comprising:

(a) a rotary laser apparatus for emitting two or more fan-shaped laser beams, said rotary laser apparatus including a laser projector and a rotary unit rotating relative to said laser projector, wherein

said laser projector has;

(1) a laser illuminator; and

(2) collimator lens means for collimating the laser beam emitted from said laser illuminator; and

said rotary unit has;

(1) beam expanders for receiving the laser beam collimated by said collimator lens;

(2) cylindrical lenses for converting the laser beams from said beam expanders into fan-shaped laser beams; and

(3) mirrors for reflecting the fan-shaped laser beams and emitting the fan-shaped laser beams from said rotary laser apparatus; and

(b) optical sensor means for receiving the fan-shaped laser beams to determine a position.

9. An apparatus for determining positions, comprising:

(a) a rotary laser apparatus for emitting two or more fan-shaped laser beams, said rotary laser apparatus including a laser projector and a rotary unit rotating relative to said laser projector, wherein;

said laser projector has;

(1) a laser illuminator and

(2) a collimator lens for collimating the laser beam emitted from said laser illuminator; and

said rotary unit has;

(1) a shield mask having at least three apertures;

(2) a first cylindrical lens for converting the laser beams passing through at least two of said apertures into fan-shaped laser beams;

(3) a wedge prism for deflecting the fan-shaped laser beams from said first cylindrical lens and emitting the fan-shaped laser beams from said rotary laser apparatus; and

(4) a second cylindrical lens for converting the laser beams passing through at least one of said apertures into fan-shaped laser beams and emitting the fan-shaped laser beams from said rotary laser apparatus; and

(b) optical sensor means for receiving the fan-shaped laser beams to determine a position.