JPH0352339A - Portable telephone system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile phone device that can be used both as a car phone and as a cordless phone indoors.

[Prior Art] Generally, as a portable telephone device, there are, for example, a mobile telephone that can be used in a car telephone system, and a cordless telephone that uses weak radio waves and the like that is used in the home.

The mobile phone on the first floor of the former car phone system is used in an area where the electric field is above a certain level between the base station and the base station. In addition, most of the latter cordless telephones use weak radio waves, and are used by securing a certain area between fixed stations. Although each type of telephone set has its own unique functions, they basically carry out telephone communication from a base station or a fixed station, respectively, via a central office line.

[Problems to be Solved by the Invention] Among the conventional mobile phone devices mentioned above, the mobile phone used in the former car phone system has an extremely high call charge (approximately 10 times that of a regular phone), and the cordless phone in the latter Telephones have drawbacks, such as the fact that they cannot be used outdoors or far away from a fixed station (several tens of meters or more).

This invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to obtain a mobile phone device that has both the functions of a car phone and the functions of a cordless phone, and has expanded functions as a telephone device. The purpose is to

[Means for Solving the Problems] A mobile phone device according to the present invention includes a wireless circuit for a car phone for transmitting and receiving telephone communication signals with a base station for a car phone, and a fixed station for a cordless phone. A wireless circuit for a cordless telephone for transmitting and receiving telephone communication signals between the two, and a switching means for switching to either the radio circuit for a car telephone or the radio circuit for a cordless telephone, and the switching means switches and receives a telephone communication signal. Telephone communication is carried out through the selected radio circuit.

[Function] In the mobile telephone device according to the present invention, by selecting either the radio circuit for a car phone or the radio circuit for a cordless phone by the switching means, the wireless circuit for a cordless phone can also be connected via a base station for a car phone. Telephone communications can also be made through stations. In other words, while it can function as a cordless telephone within the wireless communication area from a fixed station, it can function as a car telephone if it is outdoors, away from the fixed station.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a main body of a mobile telephone device, and l-1 is a mobile phone for a car telephone system for transmitting and receiving telephone communication signals with a base station for car telephones (see reference numeral 3 in Fig. 3). 1-2 is a transmitting/receiving duplexer connected to the car phone radio circuit 1-1, and 1-3 is a cordless phone fixed station (hereinafter referred to as a wireless circuit for a car phone). Those installed indoors; see number 4 in Figure 3)
1-4 is a control unit that controls various control functions in this device; this control unit 1-4 is a wireless circuit for a car phone, It also has a function as a switching means for switching and selecting which of the wireless circuits 1-1 and 1-3 for cordless telephones is to be used.

In addition, 1-5 is the power supply section of this device, which is mainly composed of a rechargeable battery, and 2 is an antenna. This antenna 2 is used both when using a car phone and when using a cordless phone. It is something that

Furthermore, the apparatus of this embodiment has an external structure as shown in FIG. 2, for example. In this Figure 2, 1-
6 is a receiver, 1-7 is a transmitter, 1-8 is a dial key,
1-9.1-10 is a switching key for manually inputting an actual instruction to the control unit 1-4 as to whether to use the radio circuit for car telephones 1-1 or the radio circuit for cordless telephones 1-3. be.

Next, the operation of the apparatus of this embodiment will be explained.

For example, when the mobile phone main body 1 is located within an area where wireless communication is possible from the cordless telephone fixed station 4 (for example, in a building where the fixed station 4 is located), the switch key 1 on the operation section of the main body 1 - 9. Operate 1-10 to switch/select the cordless telephone wireless circuit 1-3 using the control unit 1-4. As a result, the wireless circuit 1-3 is activated and connected to the fixed station 4, so that it can be used as a cordless telephone, and telephone communication can be performed via the fixed station 4 at a much lower rate than a car telephone.

In addition, if the mobile phone main body 1 is located outdoors, etc. away from the fixed station 4, in an area where the electric field from the base station 3 is higher than a certain level, the switch key 1-9.1-10 is pressed as described above. By operating and selecting the car phone radio circuit 1-1 using the control unit 1-4, the radio circuit 1-1 is activated and connected to the base station 3, so that the function as a car phone can be utilized. can. As described above, according to the device of the present embodiment, by selecting either the wireless circuit for car phone 1-1 or the wireless circuit for cordless phone 1-3 by the control unit 1-4, the function as a cordless phone can be achieved. It can also be used as a car phone, so it can be used as a cordless phone with low call charges in cordless areas, making it economical to operate. It can also perform telephone communications, greatly expanding its functionality as a portable telephone device.

In the above embodiment, the instruction to switch between a car phone and a cordless phone was input manually from the switching key 9.1-10, but a structure in which switching and selection is automatically performed by receiving base station radio waves is also possible. In this case, the switching keys 1-9, 1-10 can be omitted from the main body l of the apparatus.

[Effects of the Invention] As described above, according to the present invention, the switching means can select either the wireless circuit for a car phone or the wireless circuit for a cordless phone, and the system can be configured to be used both as a cordless phone and as a car phone. Therefore, in cordless areas, it is used as a cordless phone with low call charges and is operated economically, but by using a car phone, it can also be used for telephone communication over a wide range such as outdoors, greatly expanding its functions. This has the effect of providing a device with

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of a mobile telephone device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the external appearance of the device of the embodiment, and FIG. 3 is a diagram showing how the device of the embodiment is used. FIG. In the figure, 1-1 mobile phone device main body; 1-1-Radio circuit for car phone, 1,3-Radio circuit for cordless phone, 1-4-Control unit (switching means), 3.-Base station for car phone, 4-Fixed station for cordless@phone. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A radio circuit for a car phone for sending and receiving telephone communication signals with a base station for a car phone; a radio circuit for a cordless phone for sending and receiving a telephone communication signal between a fixed station for a cordless phone; A portable type, characterized in that it is equipped with a switching means for switching to either the radio circuit for a car phone or the radio circuit for a cordless telephone, and that telephone communication is performed through the radio circuit switched and selected by the switching means. Telephone device.