[54] THE PATH OF A VEHICLE METHOD AND APPARATUS FOR RECORDING
[76] Inventor: Hideo Sakai, No. 625, Ikemodai, Takatsu-cho, Tsuchiura, Tbaragi, Japan
[22] Filed: Mar. 1, 1974 [21] Appl. No.: 447,415
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 279,357, Aug. 10, 1972, abandoned.
[30] Foreign Application Priority Data
Aug. 11, 1971 Japan 46-60266
[52] U.S. CI 235/150.2; 235/150.27; 250/222;
250/236
[51 ] Int. CI.2 G01S 5/16; G06G 7/22
[58] Field of Search 235/150.2, 150.27, 150.24,
235/92 R, 92 TC; 250/203, 222, 236
[56] References Cited
UNITED STATES PATENTS 3,401,937 9/1968 Rockwood et al 250/222 R
3.471,697 10/1969 Riddle 250/203 R
3,590,225 6/1971 Murphy 235/92 R
3,619,630 11/1971 McLeod ct al 250/222 R
3,692,414 9/1972 Hosterman et al 250/236
3,727,067 4/1973 Shepherd 250/236
Primary Examiner—Felix D. Gruber
Attorney, Agent, or Firm—William Anthony Drucker
[57] ABSTRACT
For detecting and analyzing movement of a test vehicle over a test zone, the test vehicle is intercepted, at intervals throughout its travel, by two light beams scanning the test zone from spaced points on a base line bounding the test zone, the intervals of time occurring, at each occasion of scanning, between the moment when each light beam is coincident with the base line and thereafter coincident with the vehicle, being converted into x- and y-coordinate information and subsequently plotted to provide functions of the movement of the vehicle over the test zone.
2 Claims, 15 Drawing Figures
