Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2006-02-15
2008-09-09
Mullen, Jr., Thomas J (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S572700
Reexamination Certificate
active
07423518
ABSTRACT:
An reader/writer performing a two-way communication with a contactless tag through electromagnetic induction and supplying electric power to the contactless tag, includes: an antenna circuit having an antenna coil for electromagnetically coupling with an antenna coil in the contactless tag, the antenna circuit provided in the plural number, a first amplifier circuit amplifying a signal which the antenna circuits send outside, a first switch provided between the first amplifier circuit and each antenna circuit, the first switch provided in the plural number, a second amplifier circuit amplifying a signal which the antenna circuit received, a second switch provided between the second amplifier circuit and each antenna circuit, the second switch provided in the plural number and a control circuit turning on a predetermined switch among the first switches and a predetermined switch among the second switches, wherein the antenna coil has a loop shape and a plurality of the antenna coils are provided adjacently each other in the same plane, and the loop of the antenna coil has a shape such that an adjoining region of the antenna coils becomes as small as possible.
REFERENCES:
patent: 5699046 (1997-12-01), Accolla et al.
patent: 7205896 (2007-04-01), Wu et al.
patent: 7232068 (2007-06-01), Uchiyama et al.
patent: 2006/0132287 (2006-06-01), Phipps et al.
patent: 2000-036020 (2000-02-01), None
Mullen, Jr. Thomas J
Oliff & Berridg,e PLC
Seiko Epson Corporation
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