Radio paging receiver with display

• US 5,929,775 A
• Filed: 06/27/1997
• Issued: 07/27/1999
• Est. Priority Date: 06/27/1996
• Status: Expired due to Term

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Tsuchiyama, Kinya
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Beaulieu, Yonel
• Application Number:
  US08/883,883
• Time in Patent Office: 760 Days
• Field of Search: 340/825.44, 340/636, 340/309.15, 340/311.1, 340/635, 455/38.2, 455/38.3, 455/343, 324/426, 324/433, 320/49
• US Class Current: 340/7.37
• CPC Class Codes: G08B 3/1066 with other provisions not elsewhere provided for, e.g. turn-off protection

Abstract

A radio paging receiver capable of giving an intense impact to a user so as to stimulate the user to exchange a cell and to prevent a negligence of the cell exchange and preventing an inoperative receiving due to a source voltage drop and a cleared state of a backup device for received information. A low voltage detector monitors a source voltage Va of the cell, and, when the source voltage Va falls below a reference voltage, the low voltage detector outputs a low voltage detection signal to a logic. The logic starts a countdown of a predetermined time from the time when the low voltage detection signal is detected. The logic then controls an informing part to inform of an alarm and a display means to display the countdown of the remaining time thereon up to a power off. Further, the logic compulsorily cuts the power when the predetermined time has passed.

Claims

1. A radio paging receiver with a display, comprising:

low voltage detecting means for detecting a voltage drop of a power source;

alarm means for alarming when the voltage drop of the power source is detected;

time counting means for counting time of a clock;

time counting control means for making the time counting means start the time counting when the voltage drop of the power source is detected and for detecting a predetermined time lapse from the start of the time counting; and

power source control means for cutting the power source when the predetermined time lapse is detected in the case that the power source is not turned off and is not removed.

2. A radio paging receiver of claim 1, further comprising first informing means for informing of a value of the predetermined time when the voltage drop of the power source is detected.

3. A radio paging receiver of claim 1, further comprising:

calculating means for calculating remaining time before the predetermined time lapse on the basis of the time counted by the time counting means; and

second informing means for informing of the remaining time.

4. A radio paging receiver of claim 2, further comprising:

calculating means for calculating remaining time before the predetermined time lapse on the basis of the time counted by the time counting means; and

second informing means for informing of the remaining time.

5. A radio paging receiver of claim 3, wherein the second informing means displays the remaining time on a display means within a display range specified from outside.

6. A radio paging receiver of claim 4, wherein the second informing means displays the remaining time on a display means within a display range specified from outside.

7. A radio paging receiver of claim 4, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.

8. A radio paging receiver of claim 2, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.

9. A radio paging receiver of claim 3, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.

10. A radio paging receiver of claim 4, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.

11. A radio paging receiver of claim 5, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.

12. A radio paging receiver of claim 6, further comprising:

third informing means for informing of an alarm of the voltage drop of the power source from the time of the voltage drop detection every predetermined time interval, the third informing means carrying out the alarm informing according to a time interval specified from outside and a specification of informing equipment.