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21. 发明专利

JPH07260935A LINEAR OBSTRUCTION EXTRACTION SYSTEM 失效
公开(公告)号：JPH07260935A
公开(公告)日：1995-10-13
申请号：JP22567193
申请日：1993-09-10
申请人： NEC CORP , JAPAN TECH RES & DEV INST , NEC AEROSPACE SYS LTD
发明人： HARA HIROMU , SAITO HIDEAKI , TOSHIDA MINORU , HARADA TETSUO , MIURA YOSHIKAZU , SUGATA MASATOSHI
IPC分类号： G01S17/42 , G01S17/88 , G01S17/93
摘要： PURPOSE:To eliminate the contour of a planar object and ensure the extraction of only the contour of a linear obstruction from the contours of the linear obstruction and the planar object extracted via a differential process. CONSTITUTION:The contours of a linear obstruction and a planar object are extracted from distance information from a laser radar 1 and angle information from a scanner 2 through a differential process section 31. Furthermore, a distance data difference available from, for example, seven or more distance data, when smaller than a certain value, are judged as representing the planar object, and subjected to an elimination process at a planar object eliminating process section 32. As a result, the data of only the linear obstruction is extracted.

22. 发明专利

JPH04110685A LASER RADAR DEVICE 失效
公开(公告)号：JPH04110685A
公开(公告)日：1992-04-13
申请号：JP22976090
申请日：1990-08-30
申请人： NEC CORP
发明人： HARADA TETSUO
IPC分类号： G01S7/48
摘要： PURPOSE:To enable a high-speed scanning to be made by performing scanning using a scanning mirror for directing laser light toward a target and receiving reflection laser light and a wedge prism part for rotating mutually opposite directions by synchronizing a scanning mirror which receives reflection laser light and a plurality of wedge prisms with a same declination quantity at a high refractive index. CONSTITUTION:A wedge prism part 5 allows two wedge prisms 5a and 5b which are of a high refractive index material and a same declination quantity to be synchronized and rotated in opposite directions. Also, when the declination quantity is large, wedge angle becomes large in the case of glass materials such as BK-7 so that the wedge angle can be reduced to approximately 1/3 by using a material with a large refractive index such as ZnSe. A side-direction scanning mirror 6 discharges laser light to a target 8 and receives light which is reflected from the target. Thus, a high-speed scanning can be performed even if a reception effective diameter becomes longer by allowing two wedge prisms 5a and 5b with a high refractive index to be rotated in opposite directions while synchronizing them and then scanning them in combination with the mirror 6.

23. 发明专利

JPH02309283A POSITION FINDER BY LASER 失效
公开(公告)号：JPH02309283A
公开(公告)日：1990-12-25
申请号：JP13201689
申请日：1989-05-24
申请人： NEC CORP
发明人： HARADA TETSUO
IPC分类号： G01S17/08 , G01S17/10
摘要： PURPOSE:To make it possible to detect only a reflected light from a target without allowing an output pulse of a light-sensing circuit based on a return pulse of an unstable subpulse to pass even when this pulse is generated, by putting in a gate circuit so as not to allow the output pulse of the light-sensing so as not to allow the output pulse of the light-sensing circuit to pass when there is an output of a photodetector. CONSTITUTION:A laser light output of a laser oscillator 6 is detected by a photodetector 7 and inputted as a start signal to a counter display 10. The input of the start signal to the counter display 10 is responded only at a first pulse, and a second pulse and pulses subsequent thereto are not received until measurement of a distance is completed. An output signal of a light-sensing circuit 5 is gated by an AND gate 9, together with a signal obtained by inverting an output of the photodetector 7 by an inverter 8, and when there is not a laser output from the laser oscillator 6, the output signal from the light-sensing circuit 5 is passed to the counter display 10 as a stop signal.

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