Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-01-18
1997-04-08
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359145, 359167, 370346, 34082508, 455 541, H04B 1000, G05B 2302
Patent
active
056193610
ABSTRACT:
A base station (5) comprises a base transmitter (6) for transmitting information optically to a plurality of portable stations (1 to 4) at such a predetermined time interval as is designated by portable station designating information. Each of the portable stations (1 to 4) comprises a potable transmitter (7) for transmitting information optically to the base station (5) in response to the transmission, which is designated by the portable station designating information coming from said base station (5), and within the range of the aforementioned time interval immediately after said transmission. Transmissions (ACK1 to ACK4) from the mating portable stations to the base station are individually inserted between the interval periods of the transmissions (REQ1 to REQ4) from the base station (5) to the portable stations (1 to 4) so that the single base station performs optical communications with the plurality of portable stations in a half-duplex time sharing manner.
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Kawamura Yoshifumi
Kodama Isao
Ogane Atsushi
Sagesaka Yasuhiro
Tatezaki Junichi
Boudreau Leo
Hitachi , Ltd.
Mehta Bhavesh
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