Optical measuring system and method for optically measuring an object in a three-dimensional manner

Patent metadata

Field	Value
Publication number	US-9757216-B2
Application number	US-201415038642-A
Country	US
Kind code	B2
Filing date	Nov 24, 2014
Priority date	Nov 22, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The invention relates to an optical measuring system ( 1 ) and to a method for measuring an object ( 9 ) in a three-dimensional manner. The measuring system ( 1 ) has at least one lens array ( 5 ), a first convex lens ( 6 ) arranged downstream, a second convex lens ( 8 ) which is arranged further downstream and which faces an object ( 9 ) to be measured, and additionally a means ( 7 ) which absorbs incident light or deflects incident light out of the illuminating beam path and which is arranged upstream of the second convex lens ( 8 ) or on the second convex lens ( 8 ) on a second convex lens ( 8 ) face facing the first convex lens ( 6 ) in the region of the optical axis ( 10 ).

First claim

The invention claimed is:

1. An optical measuring system for measuring an object in a three-dimensional manner, having
at least one light source that emits illuminating beams,
at least one lens array comprising a plurality of lenses, a first convex lens arranged downstream of the lens array in the direction of propagation of the illuminating beams along an illuminating beam path as well as a second convex lens arranged downstream of the first convex lens in the direction of propagation of the illuminating beams and facing an object to be measured,
means for absorbing impinging light or directing said light out of the illuminating beam path, is arranged in the direction of propagation of the illuminating beams upstream of the second convex lens or on a side of the second convex lens facing the first convex lens on the second convex lens and extends over an area in a plane that is essentially orthogonal to an optical axis of the measuring system, said area including the optical axis of the measuring system or being spaced from said optical axis by no more than ⅙ of the diameter of the first convex lens,
wherein the plurality of lenses of the lens array are round and that the lens array has at least one space between the plurality of round lenses, and
wherein the lens array is arranged in the optical measuring system in such a way that the optical axis of the measuring system passes through one of the spaces of the lens array.

2. The optical measuring system according to claim 1 , wherein the means is designed as part of the second convex lens.

3. The optical measuring system according to claim 1 , wherein the optical measuring system is a confocal measuring system.

4. An optical measuring system for measuring an object in a three-dimensional manner, having
at least one light source that emits illuminating beams,
at least one lens array comprising a plurality of lenses, a first convex lens arranged downstream of the lens array in the direction of propagation of the illuminating beams along an illuminating beam path as well as a second convex lens arranged downstream of the first convex lens in the direction of propagation of the illuminating beams and facing an object to be measured,
means for absorbing impinging light or directing said light out of the illuminating beam path, is arranged in the direction of propagation of the illuminating beams upstream of the second convex lens or on a side of the second convex lens facing the first convex lens on the second convex lens and extends over an area in a plane that is essentially orthogonal to an optical axis of the measuring system, said area including the optical axis of the measuring system or being spaced from said optical axis by no more than ⅙ of the diameter of the first convex lens,
wherein the plurality of lenses of the lens array are round and that the lens array has at least one space between the plurality of round lenses, and
wherein the at least one space is translucent and has plane-parallel surfaces.

5. The optical measuring system according to claim 1 , wherein the lens array is arranged in the optical measuring system in such a way that the optical axis of the measuring system coincides with the center of a lens of the lens array.

6. The optical measuring system according to claim 1 , wherein the second convex lens is arranged in the focal plane of the first convex lens.

7. The optical measuring system according to claim 1 , wherein the means is arranged in the focal plane of the first convex lens.

8. The optical measuring system according to claim 1 , wherein the means is a light-absorbing, matte-black surface.

9. An optical measuring system for measuring an object in a three-dimensional manner, having
at least one light source that emits illuminating beams,
at least one lens array comprising a plurality of lenses, a first convex lens arranged downstream of the lens array in the direction of propagation of the illuminating beams along an illuminating beam path as well as a second convex lens arranged downstream of the first convex lens in the direction of propagation of the illuminating beams and facing an object to be measured,
means for absorbing impinging light or directing said light out of the illuminating beam path, is arranged in the direction of propagation of the illuminating beams upstream of the second convex lens or on a side of the second convex lens facing the first convex lens on the second convex lens and extends over an area in a plane that is essentially orthogonal to an optical axis of the measuring system, said area including the optical axis of the measuring system or being spaced from said optical axis by no more than ⅙ of the diameter of the first convex lens,
wherein the means is an n-sided, pyramidal mirror mirrored on the outer surfaces.

10. An optical measuring system for measuring an object in a three-dimensional manner, having
at least one light source that emits illuminating beams,
at least one lens array comprising a plurality of lenses, a first convex lens arranged downstream of the lens array in the direction of propagation of the illuminating beams along an illuminating beam path as well as a second convex lens arranged downstream of the first convex lens in the direction of propagation of the illuminating beams and facing an object to be measured,
means for absorbing impinging light or directing said light out of the illuminating beam path, is arranged in the direction of propagation of the illuminating beams upstream of the second convex lens or on a side of the second convex lens facing the first convex lens on the second convex lens and extends over an area in a plane that is essentially orthogonal to an optical axis of the measuring system, said area including the optical axis of the measuring system or being spaced from said optical axis by no more than ⅙ of the diameter of the first convex lens,
wherein the means is a conical mirror mirrored on the outside of the conical surface.

11. An optical measuring system for measuring an object in a three-dimensional manner, having
at least one light source that emits illuminating beams,
at least one lens array comprising a plurality of lenses, a first convex lens arranged downstream of the lens array in the direction of propagation of the illuminating beams along an illuminating beam path as well as a second convex lens arranged downstream of the first convex lens in the direction of propagation of the illuminating beams and facing an object to be measured,
means for absorbing impinging light or directing said light out of the illuminating beam path, is arranged in the direction of propagation of the illuminating beams upstream of the second convex lens or on a side of the second convex lens facing the first convex lens on the second convex lens and extends over an area in a plane that is essentially orthogonal to an optical axis of the measuring system, said area including the optical axis of the measuring system or being spaced from said optical axis by no more than ⅙ of the diameter of the first convex lens,
wherein the means is a flat mirror inclined relative to the optical axis.

12. The optical measuring system according to claim 1 , wherein the lens array is coated with an anti-reflective coating on both sides.

13. The optical measuring system according to claim 1 , wherein the measuring system is part of an intraoral dental camera.

14. The optical measuring system according to claim 13 , wherein the intraoral dental camera has a handle, a front part that can be inserted into an oral cavity and a beam deflector arranged on a free end of the front part.

1

Assignees

• Sirona Dental Systems Gmbh
• Dentsply Int Inc

Inventors

• Wewer Lukas
• Weber Mark
• Wiora Georg

Classifications

• G02B5/003

  Light absorbing elements · CPC title

• A61B1/24

  for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth · CPC title

• A61C9/006 Primary

  projecting one or more stripes or patterns on the teeth · CPC title

• G02B3/0006

  Arrays (G02B3/02, G02B5/188 take precedence) · CPC title

• G02B5/09

  Multifaceted or polygonal mirrors {, e.g. polygonal scanning mirrors; Fresnel mirrors} · CPC title