Optical position measuring system using an interference pattern
Filing Information
- Patent Number: US7009713
- Application Number: US10426632
- Filing date: 05/01/2003
- Issue date: 03/07/2006
- Prior Publication Data:
- US20040004723 - 01/08/2004
- Predicted expiration date: 02/27/2024
- Patent term adjustment: 302
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analyzing 100 million+ documents to uncover your network...- U.S. Classifications: 356/498 ·
- International Classifications: G01B902 ·
- Foreign Priority: JPP2002130341 - 05/02/2002 · JPP2002336341 - 11/20/2002 ·
Abstract
A position measuring system including a laser light source for radiating a laser beam, an optical lens system for generating an interference pattern on the basis of the laser beam having passed through different optical paths, a detector for detecting the interference pattern, and an arithmetic unit for calculating the position of at least one of the light source and the detector on the basis of a detection signal issued from the detector. For example, a spherical lens can be used as the optical lens system. In this case, the interference pattern is formed on the basis of spherical aberration of the lens. Alternatively, a multifocal lens may be used as the optical lens system.References Cited
U.S. Patent Documents
| Document Number | Assignees | Inventors | Issue/Pub Date |
|---|---|---|---|
| US4627722* | Ball Corporation | Falk et al. | Dec 1986 |
| US5699158* | Canon Kabushiki Kaisha | Negishi | Dec 1997 |
| US6100538* | Kabushikikaisha Wacom | Ogawa | Aug 2000 |
| US6714311* | Xiroku Inc. | Hashimoto | Mar 2004 |
Foreign Patent Documents
| Document Number | Assignees | Inventors | Issue/Pub Date |
|---|---|---|---|
| JPB248724 | Feb 1992 |
Referenced By
| Document Number | Assignee | Inventors | Issue/Pub Date |
|---|---|---|---|
| US7554676 | Fuji Xerox Co., Ltd. | Yasuji Seko | Jun 2009 |
| US7489406 | Fuji Xerox Co., Ltd. | Yasuji Seko | Feb 2009 |
| US7633628 | Fuji Xerox Co., Ltd. | Yasuji Seko | Dec 2009 |
| US7274461 | Fuji Xerox Co., Ltd. | Yasuji Seko | Sep 2007 |
| US7330278 | Mitutoyo Corporation | Tadashi Iwamoto et al. | Feb 2008 |
Patent Family
| Document Number | Assignee | Inventors | Issue/Pub Date |
|---|---|---|---|
| US20040004723 | Fuji Xerox Co., Ltd. | Hiroyuki Hotta et al. | Jan 2004 |
| JP2004028977 | FUJI XEROX CO LTD | SEKO YASUJI et al. | Jan 2004 |
| US7009713 | Fuji Xerox Co., Ltd. | Yasuji Seko et al. | Mar 2006 |
| JP3975892 | Sep 2007 |
Independent Claims | See all claims (53)
- 1. A position measuring system, comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and an irradiation unit irradiating the object with the laser beam, wherein the optical lens system generates the interference pattern of the rays of the laser beam each having passed through different optical path after the laser beam has been reflected by the object.
- 7. A position measunng system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a multifocal lens.
- 8. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed tbrouh different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes at least one member selected from the group consisting of a conical lens, a triangular prism, and a polyangular pyramid lens.
- 9. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a one-piece lens formed by combination of a plurality of lenses having focal points located on one optical axis.
- 10. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a one-piece lens formed by combination of a plurality of lenses having focal points located on different optical axes.
- 11. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed throu different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the curvature radius on the light output side of the lens is constituted by one curvature.
- 12. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a reflecting mirror.
- 13. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed throu different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the arithmetic unit calculates the position on the basis of the quantity of movement of the interference pattern.
- 14. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed throu different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the arithmetic unit calculates the position on the basis of the number of interference fringes in the interference pattern.
- 15. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the arithmetic unit calculates the position on the basis of the whole shape of the interference pattern.
- 16. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the detector comprises a plurality of detectors so that the arithmetic unit calculates the three-dimensional position of the light source by using the plurality of detectors.
- 17. A position measuring system comprising: a light source radiating laser beam; an optical lens system aenerating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the light source comprises a plurality of light sources so that the arithmetic unit calculates the three-dimensional position of the detector by using the plurality of light sources.
- 18. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; an irradiation unit irradiating the object with the laser beam, wherein the optical lens system generates the interference pattern of the rays of the laser beam each having passed through different optical path after the laser beam has been reflected by the object, and the object includes a reflecting member having a high reflectance region.
- 19. A position measunng system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a hemisphere lens.
- 20. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system is provided so that a first surface of a lens to which light is input is formed as a convex spherical surface and a second surface of the lens from which light is output is formed as a planar surface and disposed in a vicinity of the detector.
- 21. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed throu different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system is provided so that a first surface of a lens to which light is input is formed as a convex spherical surface, and a substance having a predetermined refractive index is filled in a gap between the spherical surface and the detector.
- 22. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system includes a sphere lens.
- 23. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the detector includes two arrays, each of which has photo acceptance elements arranged one-dimensionally and which are disposed so as to be perpendicular to each other in a plane perpendicular to an optical axis.
- 24. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the detector includes an array of photo acceptance elements arranged two-dimensionally.
- 25. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the light source comprises a plurality of light sources radiating laser beams at different wavelengths respectively, the optical lens system comprises a plurality of optical lens systems generating interference patterns from the laser beams respectively, the detector comprises a plurality of detectors detecting the interference patterns respectively, and the arithmetic unit calculates the position of at least one of the plurality of detectors on the basis of detection signals issued from the plurality of detectors respectively.
- 28. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system generates the interference pattern on the object, the detector detects the interference pattern on the object and the arithmetic unit calculates a point of intersection between an optical axis of the optical lens system and a detection surface of the detector.
- 34. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and an input device integrally provided with the light source and a pen used for writing on a plane, wherein the arithmetic unit calculates the three-dimensional position of the input device to thereby acquire the shape of the character written on the plane.
- 35. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and wherein the optical lens system generates the interference pattern on the object, the detector detects the interference pattern on the object and the detector is a camera unit for picking up an image of the interference pattern generated on the object, the interference pattern is a periodic interference pattern having light intensity varying periodically, and the arithmetic unit acquires a distance image of the object on the basis of phase information in the periodic variation of light intensity.
- 40. A position measuring system comprising: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector; and a pointer module in which the light source and the optical lens system are integrated with each other; and a cursor position display means, wherein the object is a display region of an image, the detector is disposed in a vicinity of the object, and the cursor position display means displays a cursor at the position of a point of intersection between an optical axis of the optical lens system and a detection surface of the detector or at a position of the light source projected onto the display region on the basis of the position of the object calculated by the arithmetic unit.
- 45. An input device used for a position measuring system including: a light source radiating laser beam; an optical lens system generating an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector the input device, comprising: the light source; and a pen used for writing on papers, the pen is integrated with the light source.
- 49. A position measuring system comprising: a pointer having a light source that radiates laser beam and an optical lens system that generates an interference pattern of rays of the laser beam each having passed through different optical path; a detector of the interference pattern; and an arithmetic unit for calculating the position of an object on the basis of a detection signal issued from the detector, wherein the optical lens system projects the interference pattern on the object, the detector is disposed in a vicinity of the object for detecting the interference pattern, and the arithmetic unit calculates the center position of the interference pattern.
