JPH0434605Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a so-called cordless telephone consisting of a base device connected to a telephone line and a telephone wirelessly coupled to this device.

BACKGROUND ART Conventionally, a cordless telephone has been equipped with a circuit section for obtaining the function of a telephone and a circuit section related to a wireless system, and these are integrated on the same printed circuit board or as different circuits. It is often constructed on a separate printed circuit board.

Problems to be Solved by the Invention However, in the above-mentioned conventional cordless telephone, the wireless circuit part is at least an independent printed circuit board, and in order to eliminate mutual interference inside the cordless telephone, ,
All they had to do was search for the optimal shielding method and add processing. Further, when designing a circuit, the board configuration, component arrangement, etc. must be performed each time according to the design, which poses a problem in terms of design efficiency.

The present invention solves these conventional problems by eliminating interference between the wireless system and other circuits, greatly simplifying the circuit configuration, and improving assembly workability, serviceability, and reliability. The object of the present invention is to provide an excellent cordless telephone that can be expected to have excellent effects and can also significantly reduce costs.

Means for Solving the Problems In order to achieve the above object, the present invention completely eliminates each wireless circuit part included in a base device connected to a telephone line and a telephone wirelessly connected to this base device. It is constructed so that it can be integrated with the circuit board, housed in a metal shield case, and connected to other circuits using a connector or a connector for connecting a printed circuit board.

Effects The present invention has the following effects due to the above configuration. In other words, the base equipment and each wireless part of the telephone are completely integrated into a unit and each is independently shielded with a shield case, so interference with external circuits can be almost completely prevented, and the handling is easy.
A great effect can be achieved in terms of reliability, etc.

Embodiment FIGS. 1 and 2 are perspective views of an embodiment of a telephone and a base device, respectively, which constitute the cordless telephone of the present invention.

In FIG. 1, 1 is a case constituting a telephone set, and 2 is a wireless circuit unit integrated with a shield case. 3 is an antenna, 4 is a printed circuit board on which a communication circuit section, a radio circuit unit 2, etc. are mounted, 5 is a mouthpiece, and 6 is an earpiece. Note that the wireless circuit unit 2 arranged on the printed circuit board 4
As shown in FIG. 1, it is shielded and separated from other circuit parts, and its outer case has a shielding effect and is connected to be electrically grounded. All input, output and control related terminals to the radio circuit unit 4 are arranged and configured as an integrated connector or pin terminals that can be inserted into a printed circuit board.

In Fig. 2, 7 is a case constituting the base equipment, and 8 is a radio circuit unit integrated with a shield case, which is completely equivalent to radio circuit unit 2 used in the above-mentioned telephone. It is configured. Reference numeral 9 denotes a printed circuit board on which the wireless circuit unit and the circuit section are mounted, and a microcomputer in charge of control is also arranged on this printed circuit board 9. 10 is a sound hole for a microphone, 11 is a sound hole for a speaker, and 12 is an antenna. Note that the radio circuit units 2 and 8 each have a built-in transmitting circuit and a receiving circuit, and are equivalent, but the mutual transmitting and receiving frequencies are different between the base equipment and the telephone so that round-trip communication can be performed. The frequencies of each radio circuit unit are made different so that the

Effects of the invention As is clear from the above embodiments, the invention has the following effects.

(1) Although other circuits, including microcomputers, coexist on both the base equipment and the printed circuit boards in the telephone, the wireless circuit part is integrated and housed in a shield case.
External noise can be completely blocked, and unnecessary radiation to the outside can be completely prevented.

(2) Since the radio circuit system is unitized, it is easy to handle and store, and there are no restrictions on the location relative to other circuits when storing it. has advantages.

(3) Since the radio circuit system is integrated into a unit, the unit can be easily replaced during repair, and the channel can be easily changed if necessary.

(4) As a cordless phone, regardless of whether it uses weak radio waves or low-power radio waves,
It has the advantage that the output and frequency cannot be easily modified by the user.

(5) Because the wireless circuit system is unitized and shielded, it is highly reliable, cost effective, and resistant to changes over time.
It has great features such as excellent resistance to dust and other environments.

(6) Since the circuit that functions as a telephone and the wireless circuit are mounted on the same printed circuit board, the casing is thin and compact, making it easy to hold.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of a telephone that constitutes the cordless telephone of the present invention, and FIG. 2 is a schematic diagram of a base unit. 1...Telephone case, 2...Radio circuit unit, 3...Antenna, 4...Printed circuit board, 5...
...Mouthpiece, 6...Earpiece, 7...Base equipment case, 8...Wireless circuit unit, 9...Printed circuit board, 10...Sound hole for microphone, 11...Sound hole for speaker, 12... …antenna.

Claims (1)

[Scope of utility model registration request] It consists of a base device connected to a telephone line and a telephone set wirelessly connected to this base device, and in the base device and the telephone set, a circuit that functions as a telephone set and a circuit made of metal or the like that has a shielding effect and are integrated into a unit are used. A cordless phone that has wireless circuits housed in cases with the same effect mounted on the same printed circuit board.