United States Patent [19] % ["] Patent Number: 4,734,694
Umetsii et al. [45] Date of Patent: Mar. 29, 1988
[54] PAGER
[75] Inventors: Shinjiro Umetsu; Yutaka Ichikawa;
Koichi Nagata, all of Tokyo, Japan
[73] Assignee: NEC Corporation, Japan
[21] Appl. No.: 764,857
[22] Filed: Aug. 12,1985
[30] Foreign Application Priority Data
Aug. 22, 1984 [JP] Japan 59-174665
[51] Int. a* G08B 5/22; H04B 11/16
[52] U.S. a 340/825.44; 340/825.47;
340/825.48; 455/179; 150/36
[58] Field of Search 340/825.44, 825.47,
340/825.48; 455/33, 36, 77, 76, 179, 150;
379/59, 60
[56] References Cited
U.S. PATENT DOCUMENTS
4,317,222 2/1982 Bell et al 455/77
4,369,443 1/1983 Giailanza et al 340/825.47
4,370,650 1/1983 Norrell 340/825.48
4,403,342 9/1983 Borras et al 455/33
4,477,807 10/1984 Nakajima et al 340/825.44
4,501,017 2/1985 Higgins et al 340/825.44
4,618,997 10/1986 Imazeki et al 455/76
Primary Examiner—Ulysses Weldon
Assistant Examiner—Ralph E. Smith
Attorney, Agent, or Firm—Laff, Whitesel, Conte & Saret
[57] ABSTRACT
A pager which is usable in a plurality of service areas is disclosed. The pager includes a radio section for selectively receiving and modulating two or more radio frequencies, and frequency switching means for switching the receive frequency of the radio section when a signal on a predetermined receive frequency fails to be received. Power source control means is provided for cutting down power consumption. The own call signal is switched at the same time as the receive frequency to offer an effect as would be provided by a plurality of pagers. The receive frequency is displayed so that the user may see a particular service area to which his or her own pager belongs.
8 Claims, 16 Drawing Figures
