Abstract: A pager in which is written a paging ID shared among the remaining pagers of the same group, the pager including storage means for storing a character string; data comparing means for comparing the character string included in a received message with the data stored in the storage means; and operation execution means for commencing an operation on the basis of the result of the comparing operation performed by the data comparing means. The storage means is made interchangeable among pagers, or the data stored in the storage means can be rewritten. Categories of pagers in the same group may be readily established or changed through interchanging of the storage means or through rewriting of the data stored in the storage means.

Abstract: An object of the present invention is to provide an electronic appliance equipped with a charging function, in which a rechargeable battery is not discharged even when the electronic appliance is operated during charge operation.

Abstract: In a cellular phone of the invention, a rechargeable battery is used as a power supply to feed power to a second load and a regulator via a charging current detector circuit and a charging switch when an external power is not fed. The power is converted to an optimum voltage by the regulator and fed to a CPU and a load. When the external power is fed, the rechargeable battery is recharged and the charging current is detected by the charging current detector circuit. While a variation in the load is caused by a change in the operating state of the cellular phone from the call termination ready state to conversation state, or while a variation in the second load is caused by lighting of a key backlight, the current flowing in the charging current detector circuit stays constant and the correct charging current can be detected exclusively.

Abstract: In a cellular phone of the invention, a rechargeable battery is used as a power supply to feed power to a second load and a regulator via a charging current detector circuit and a charging switch when an external power is not fed. The power is converted to an optimum voltage by the regulator and fed to a CPU and a load. When the external power is fed, the rechargeable battery is recharged and the charging current is detected by the charging current detector circuit. While a variation in the load is caused by a change in the operating state of the cellular phone from the call termination ready state to conversation state, or while a variation in the second load is caused by lighting of a key backlight, the current flowing in the charging current detector circuit stays constant and the correct charging current can be detected exclusively.

Abstract: In a pager, two battery negative terminals are provided which are connected to an air battery (1). One (1b) of the battery negative terminals is connected to ground (GND), while the other (1c) is connected through a resistor (6) to the external power source positive terminal of an external terminal (3). When the air battery (1) is mounted thereon, the battery negative terminals (1b and 1c) are electrically connected to each other (short-circuiting). In this case, even if the external power source is applied through the external terminal (3) with the air battery (1) mounted thereon, the current of the external power source flows through the resistor (6) to the ground (GND). This feature prevents the air battery (1) from being charged by the external power source.

Abstract: A pager is disclosed which includes, in addition to a message receiving function, a data generation program responsive to an operation for generating and storing data in the memory; an optical communication circuit for generating and transmitting a first optical signal indicative of the message or the generated data in accordance with a data selection command to another of the pager and for directly receiving a second optical signal including second data from another pager and outputting the received data; and a receiving control program for storing the received data in the memory in response to a receiving command. It may further comprise: an ID code generation program for generating a first ID code according to the data selection command; a data attaching program for attaching the ID code to data to be transmitted to another pager. The received data is stored according to the received ID code. A light intensity changing circuit may change an intensity of the first optical signal.

Abstract: A pager which includes, in addition to a message receiving function, a data generation program responsive to an operation for generating and storing data in the memory; and optical communication circuit for generating and transmitting a first optical signal indicative of the message or the generated data in accordance with a data selection command to another pager and for directly receiving a second optical signal including second data from the other pager and outputting the received data; and a receiving control program for storing the received data in the memory in response to a receiving command. It may further comprise: an ID code generation program for generating a first ID code according to the data selection command; a data attaching program for attaching the ID code to the data to be transmitted to another pager. The received data is stored according to the received ID code. A light intensity changing circuit may change an intensity of the first optical signal.

Abstract: A pager unit that can receive a message when it is turned off. A power supply of the pager unit is turned on by a control unit prior to the time scheduled to receive a message, and then turned of f after the message has been received. Accordingly, the pager can receive a message during the time it is scheduled to be turned off, conserving battery power while allowing it to receive scheduled messages. The receiving time for receiving messages can be arbitrarily set via a time-setting changing message received while the pager is turned on.

Abstract: The preset reception time and reception message type are stored in a storage section 7. A reception monitor section 8 checks whether or not a message arrives at the reception time. If lost paging or a reception mistake occurs and the message does not arrive, a notification section 4 or a display section 5 is used to inform the user of the fact. The user can take steps of making a request for resending the message, etc.