| US 7,491,956 B2 | ||
| Optical scanning device having a distance sensor and a determined focal distance for scanning objects | ||
| Jochem Knoche, Erlangen (Germany); Sebastian Schmidt, Weisendorf (Germany); Christian P. Schultz, Beverly, Mass. (US); and Wolfgang Strob, Erlangen (Germany) | ||
| Assigned to Siemens Aktiengesellschaft, Munich (Germany) | ||
| Filed on Jan. 29, 2007, as Appl. No. 11/699,722. | ||
| Claims priority of application No. 10 2006 004 583 (DE), filed on Feb. 01, 2006. | ||
| Prior Publication US 2007/0239034 A1, Oct. 11, 2007 | ||
| Int. Cl. G01N 21/86 (2006.01) | ||
| U.S. Cl. 250—559.29 [250/208.1] | 20 Claims |
| 1. An optical scanning device for scanning an object, the device comprising:
an excitation light source operable to illuminate the object to be scanned;
an image detector operable to detect excited emission rays through illumination of the object to be scanned by the excitation
light source and includes imaging optics that dictate a focal distance;
a distance checking indicator;
a distance sensor operable to measure a distance between the optical scanning device and the object to be scanned; and
a control device that is operable to activate the distance checking indicator when the control device determines, as a function
of the measured distance, that the image detector is positioned at or near the focal distance.
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