Communications: electrical – Selective – Having indication or alarm
Patent
1978-11-21
1981-03-24
Groody, James J.
Communications: electrical
Selective
Having indication or alarm
250578, 340556, G08G 104, G08B 1318
Patent
active
042583519
ABSTRACT:
The system for collection and transmission of road traffic information comprises a lens system installed on a tall structure such as on the roof of a building and angled vertically or diagonally to include in its field of view a road area subjected to observation and a plurality of photoelectric conversion elements disposed on the focal plane of the lens system along the image of the road area to be formed on the focal plane. The plurality of photoelectric conversion elements are formed in shapes successively decreased in width and length in conformity with the perspective view of the road area formed on the focal plane of the lens system. This system operates on the principle that when a vehicle enters the road area under observation by this system, it causes a change in the brightness of the image of the road area formed on the focal plane of the lens system, the changed brightness of the image induces a corresponding change in the outputs of the photoelectric conversion elements, and the resultant change in the outputs on being processed by scanning gives rise to a series of pulse signals, which are transmitted to a traffic control center.
REFERENCES:
patent: 3341848 (1967-09-01), Niediek
patent: 3381219 (1968-04-01), Dumbeck
patent: 3506809 (1970-04-01), Pallat
patent: 3889117 (1975-06-01), Shaw, Jr.
patent: 3965430 (1976-06-01), Brandt
patent: 3972021 (1976-07-01), Leitz
patent: 4041293 (1977-08-01), Kihlberg
IEEE Transactions on Vehicular Technology, "Electromagnetic Loop Vehicle Detectors", Anderson, vol. VT-19, No. 1, Feb. 1970, pp. 23-29.
IEEE Transactions on Vehicular Technology, "Radar, Acoustic, and Magnetic Vehicle Detectors", Barker, vol. VT-19, No. 1, Feb. 1970, pp. 30-43.
Imai Takashi
Matsumoto Shuntetsu
Ooyama Naotake
Shigeta Kiyoko
Agency of Industrial Science & Technology
Groody James J.
Ministry of International Trade & Industry
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