Surveying instrument and three-dimensional camera

Patent metadata

Field	Value
Publication number	US-10088307-B2
Application number	US-201615019360-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Feb 16, 2015
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

The invention provides a surveying instrument, which comprises a light emitting element for emitting a distance measuring light, a distance measuring light projecting unit for projecting the distance measuring light, a light receiving unit for receiving a reflected distance measuring light, a photodetection element for receiving the reflected distance measuring light and for producing a photodetection signal and a distance measuring unit for performing a distance measurement based on a light receiving result from the photodetection element, further comprises a first optical axis deflecting unit disposed on a projection optical axis of the distance measuring light for deflecting an optical axis of the distance measuring light at a deflection angle as required and in a direction as required, a second optical axis deflecting unit disposed on a light receiving optical axis for deflecting the reflected distance measuring light at the same deflection angle and in the same direction as the first optical axis deflecting unit and a projecting direction detecting unit for detecting a deflection angle and a deflecting direction by the first optical axis deflecting unit, wherein it is so arranged that the distance measuring light is projected through the first optical axis deflecting unit and the reflected distance measuring light is received by the photodetection element through the second optical axis deflecting unit and a three-dimensional data of a measuring point is obtained based on a distance measuring result of the distance measuring unit and a detection result of the projecting direction detecting unit.

First claim

The invention claimed is:

1. A surveying instrument comprising; a light emitting element for emitting a distance measuring light, a distance measuring light projecting unit for projecting said distance measuring light, a light receiving unit for receiving a reflected distance measuring light, a photodetection element for receiving the reflected distance measuring light and for producing a photodetection signal and a distance measuring unit for performing a distance measurement based on a light receiving result from said photodetection element, further comprising a first optical axis deflecting unit disposed on a projection optical axis of said distance measuring light for deflecting an optical axis of said distance measuring light at a deflection angle as required and in a direction as required, a second optical axis deflecting unit disposed on a light receiving optical axis for deflecting the reflected distance measuring light at the same deflection angle and in the same direction as said first optical axis deflecting unit and a projecting direction detecting unit for detecting a deflection angle and a deflecting direction by said first optical axis deflecting unit, wherein it is so arranged that said distance measuring light is projected through said first optical axis deflecting unit and said reflected distance measuring light is received by said photodetection element through said second optical axis deflecting unit,
wherein said first optical axis deflecting unit is composed by an overlapping pair of circular first optical prisms, said second optical axis deflecting unit is composed by an overlapping pair of circular second optical prisms, each of said first optical prisms is independently rotatable, each of said second optical prisms is independently rotatable and it is so arranged that one of said first optical prisms and one of said second optical prisms are rotated in synchronization with each other, and it is so arranged that the other of said first optical prisms and the other of said second optical prisms are rotated in synchronization with each other,
and a three-dimensional data of a measuring point is obtained based on a distance measuring result of said distance measuring unit and a detection result of said projecting direction detecting unit.

2. The surveying instrument according to claim 1 , wherein said second optical axis deflecting unit is composed by the overlapping pair of optical prisms and it is so arranged that each of the optical prisms is independently rotatable.

3. The surveying instrument according to claim 1 , wherein the optical prisms which compose said second optical axis deflecting unit are Fresnel prisms.

4. The surveying instrument according to claim 1 , further comprising; an arithmetic processing unit and a posture detecting device, wherein said posture detecting device is capable of detecting a tilt angle and a tilting direction of said projection optical axis with respect to the horizontal and said arithmetic processing unit is arranged so as to correct a distance measuring result of said distance measuring unit based on a detection result of said posture detecting device.

5. A three-dimensional camera comprising; said surveying instrument according to claim 1 , an arithmetic processing unit and an image pickup device having an image pickup optical axis in parallel with said projection optical axis and having a known relation with said projection optical axis, wherein said arithmetic processing unit is configured so as to acquire an image with a three-dimensional data by associating a distance measuring result obtained by said surveying instrument with an image acquired by said image pickup device.

6. The three-dimensional camera according to claim 5 , further comprising a posture detecting device, wherein said posture detecting device is capable of detecting a tilt angle and a tilting direction of said projection optical axis with respect to the horizontal and said arithmetic processing unit is configured so as to correct a distance measuring result of said distance measuring unit based on a detection result of said posture detecting device.

7. The surveying instrument according to claim 2 , wherein the optical prisms which compose said second optical axis deflecting unit are Fresnel prisms.

8. A surveying instrument comprising; a light emitting element for emitting a distance measuring light, a distance measuring light projecting unit for projecting said distance measuring light, a light receiving unit for receiving a reflected distance measuring light, a photodetection element for receiving the reflected distance measuring light and for producing a photodetection signal and a distance measuring unit for performing a distance measurement based on a light receiving result from said photodetection element, further comprising a first optical axis deflecting unit disposed on a projection optical axis of said distance measuring light for deflecting an optical axis of said distance measuring light at a deflection angle as required and in a direction as required, a second optical axis deflecting unit disposed on a light receiving optical axis for deflecting the reflected distance measuring light at the same deflection angle and in the same direction as said first optical axis deflecting unit and a projecting direction detecting unit for detecting a deflection angle and a deflecting direction by said first optical axis deflecting unit, wherein it is so arranged that said distance measuring light is projected through said first optical axis deflecting unit and said reflected distance measuring light is received by said photodetection element through said second optical axis deflecting unit,
wherein said distance measuring light projecting unit has a reflection mirror for coinciding said projection optical axis with said light receiving optical axis,
wherein said second optical axis deflecting unit is composed by an overlapping pair of circular second optical prisms,
said first optical axis deflecting unit is composed by an overlapping pair of circular first optical prisms, wherein said first optical prisms are provided at a center of said second optical prism, said first optical prisms and said second optical prisms are integrated, each of the integrated optical prisms is configured as independently rotatable,
and a three-dimensional data of a measuring point is obtained based on a distance measuring result of said distance measuring unit and a detection result of said projecting direction detecting unit.

9. The surveying instrument according to claim 8 , wherein the optical prisms which compose said second optical axis deflecting unit are Fresnel prisms.

Assignees

• Kk Topcon

Inventors

• Ohtomo Fumio
• Kumagai Kaoru

Classifications

• G01S17/86 Primary

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

• H04N13/25

  using two or more image sensors with different characteristics other than in their location or field of view, e.g. having different resolutions or colour pickup characteristics; using image signals from one sensor to control the characteristics of another sensor · CPC title

• G01C1/04

  combined with cameras · CPC title

• G01C15/002

  Active optical surveying means (optical plumbing G01C15/105) · CPC title

• G01S7/4817

  relating to scanning · CPC title