The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 2000
Filed:
Sep. 23, 1998
Kabushiki Kaisha TOPCON, Tokyo-to, JP;
Abstract
The laser survey instrument according to the present invention comprises a rotary laser device and a photodetector for receiving a laser beam, wherein the rotary laser device comprises a light source unit for emitting the laser beam, a rotator for projecting the laser beam toward the photodetector by rotary irradiation, detection means for detecting status of the rotary laser device, and a control unit for changing the number of rotations of said rotator based on the result of detection from the detection means in order to transmit the detection result from the detection means to the photodetector, the photodetector comprises a photodetection unit for receiving the laser beam from the rotary laser device and for issuing a photodetection signal, display means having a display corresponding to the photodetection signal, and judging means for detecting the number of rotations of the laser beams from the photodetection signal of the photodetection unit and for operating the display means according to the rotating condition, the rotary laser device changes the number of rotations of the laser beam according to trouble when trouble occurs on the rotary laser device, and the photodetector judges the number of rotations of the laser beam, provides a display corresponding to the number of rotations and notifies status of trouble on the rotary laser device.