JPH04185039A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To attain the miniaturization and light weight of an incoming call only cordless telephone set by forming the shape of an antenna cylindrically, and housing a printed circuit board on which a circuit component is loaded in the inside of the antenna. CONSTITUTION:The Inside of a cordless telephone set main body 11 comprised for incoming call only is formed in such a way that the antenna 17 is comprised of a metallic member consisting of a square cylindrical part (a) and a spiral part (b), and the inside of the cylindrical part (a) is shielded uniformly. On the printed circuit board 19, a microphone 20 is arranged at a position in accordance with a microphone hole 4, and another circuit is packaged appropriately, and they are housed in the inside of the antenna 17. In such a case, a high shielding effect can be obtained compared with another position by arranging an inductance 21 for tuning so as to be located in almost the center position of the cylindrical part (a) of the antenna 17 when the board 19 is housed in the inside of the antenna 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cordless telephone used as a handset for a base (main telephone).

[Conventional technology]

FIG. 4 is a diagram showing the appearance of a conventional base unit and a cordless telephone.

In the figure, reference numeral 41 is a base unit, and reference numeral 42 is a cordless telephone used as a slave unit, which is connected to a charger 43 to be charged when in standby mode.

Since the cordless telephone 42 also performs a dialing operation, a dial button switch 44 is added to the handset section.

FIG. 5 is an exploded view showing the main built-in components of the cordless telephone 42.

In the figure, numeral 51 is a printed circuit board on which the dial button switch 44 is mounted, numeral 52 is a printed circuit board on which circuit components are mounted, and a metallic shield case 54 is used to shield the tuning inductance 53 peculiar to cordless telephones. will be installed. Other main built-in items include a handset 55, a transmitter 56, an antenna 57, and a battery 58.

FIG. 6 is a sectional view showing the internal structure of the antenna 57.

In the figure, an antenna main body 61 is formed by a rod-shaped part a as a support member and a coil-shaped part, and is further covered with an insulating outer cover 62.

Furthermore, the frequency used by low-power cordless telephones is 2.
Since the bands are 50 MHz and 380 MHz, the wavelength is approximately 1 m, and even when a 1/4 wavelength Rondo antenna is used, the length of the antenna is approximately 20 to 30 c11. However, since the operability is poor as it is, the antenna is made into a coil shape to make it look shorter as shown in FIG.

[Problem to be solved by the invention]

By the way, there is a way to keep a cordless telephone handy to make it easier to answer unexpected calls. That is,
In this method, a cordless telephone is used only for incoming calls, and the base unit is used to make outgoing calls.

For users who use the phone in this way, the dial button switch 44, which is used only when making a call, is useless.

On the other hand, conventional cordless telephones are naturally equipped with a dial button switch 44 within the handset, making it difficult to reduce the size and weight of the telephone. In addition, for users who use the device in the manner described above, unnecessary items are costly.

An object of the present invention is to provide a cordless telephone that is small, lightweight, and has excellent portability.

[Means to solve the problem]

The invention according to claim 1 provides a cordless telephone configured exclusively for receiving calls by eliminating a dial button switch, in which a part of the antenna is configured in a cylindrical shape, a circuit board is housed inside the antenna, and the antenna is mounted on the circuit board. The invention according to claim 2 is characterized in that, among the circuit components, a circuit component that requires shielding is arranged approximately in the center of the cylindrical portion of the antenna. The present invention is characterized in that the flexible printed circuit board is formed into a cylindrical shape and housed in the cylindrical portion of the antenna.

[For production]

The present invention has a cylindrical antenna shape and houses a printed circuit board with circuit components inside, thereby eliminating the need for a shield case that was necessary to shield the tuning inductance. Smaller size and lighter weight can be achieved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention. Note that (a) is an external view of the cordless telephone, and Φ) is an exploded view showing the main components of the cordless telephone.

In FIG. 1 (3), a cordless telephone main body 11 made of an insulating outer cover is provided with a call switch I2 at a position linked to the internal circuit for switching to a talking state when receiving a call, and a cap 13 is attached. It will be done. cap 13
is provided with a microphone hole 14 and an earphone terminal 15, and an earphone 16 serving as a receiver is provided in the earbon terminal 15.
is connected.

In FIG. 1(b), inside the cordless telephone main body 11, an antenna 17 is constructed of metal members including a prismatic cylinder part a and a spiral part, and the inside of the prismatic cylinder part a is uniformly shielded. Here, reference numeral 18 is a battery, and reference numeral 19 is a printed circuit board on which circuit components are mounted. A microphone 20 serving as a transmitter is installed in the microphone hole 14 on the printed circuit board 19.
The antenna I7 is installed at a position corresponding to the antenna I7, and other circuits are appropriately mounted and housed inside the antenna I7.

Here, the tuning inductance 21 is the printed circuit board 1
When antenna 9 is housed inside antenna 17, antenna 1
By arranging it approximately at the center of the prismatic cylinder portion a of No. 7, it is possible to obtain a greater shielding effect than in other positions.

Note that the connection portions between the printed circuit board 19, the call switch 12, the earphone terminal 15, and the battery 18 are omitted in the drawing.

This cordless telephone is assembled by inserting the battery 18 and the antenna 17 into the cordless telephone main body 11, and further inserting the printed circuit board 19 into the antenna 17, and then attaching the cap 13 to the cordless telephone main body 11.
This is done in the following steps:

To start a call in response to an incoming call, the call switch 12 is turned on when the main telephone ringtone is heard, the call circuit is activated, and the call is started via the earphone 16 and the microphone 20. After the call ends, the call switch 12 is turned off.

This configuration eliminates the need for the conventional shield case used to shield circuit components (tuning inductance), and also eliminates the dial button switch, making it easy to reduce size and weight, making it extremely easy to handle incoming calls. A dedicated cordless telephone can be realized.

FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention. Note that (a) is an external view of the cordless telephone, and (b) is an external view of the cordless telephone.
1 is an exploded view showing the main components of a cordless telephone.

The feature of this embodiment is that the cordless telephone main body 11 and the antenna 17 have a cylindrical shape. Therefore, a flexible printed circuit board 22 is used as a printed circuit board on which circuit components are mounted, and the flexible printed circuit board 22 is shaped into a cylinder and inserted into the antenna 17.

Note that mounting an LSI or other relatively large components can be facilitated by making a cut in a part of the flexible printed circuit board 22 with a size smaller than the inner diameter of the antenna and making that part flat. Furthermore, insulation between the antenna 17 and the flexible printed circuit board 22 can be easily achieved by inserting an insulating film between the two, and is therefore omitted in the drawing. Other parts corresponding to those in the first embodiment are indicated by the same reference numerals, and their explanations will be omitted.

With such a configuration, the same effects as those of the first embodiment can be expected, and furthermore, the flexible printed circuit board 22
By making the width closer to the circumference of the antenna 17, it can be made larger than its diameter. Therefore, rather than forming the cordless telephone main body 11 in the prismatic shape shown in the first embodiment, it is possible to make the main body itself thinner as long as the printed circuit board has the same area (width).

FIG. 3 is a diagram showing the configuration of a third embodiment of the present invention. Note that only the antenna shape is shown here.

In the first embodiment and the second embodiment, the prismatic (cylindrical) tube part a and the spiral part A of the antenna 17 had the same diameter, but this embodiment is characterized in that they have different diameters. Note that the prismatic (cylindrical) cylindrical portion a and the spiral portion are electrically connected.

Therefore, the printed circuit board 19 (flexible printed circuit board 22) is housed inside the prismatic (cylindrical) tube portion a.

〔Effect of the invention〕

As described above, the present invention provides a cordless telephone exclusively for incoming calls that eliminates the dial button switch for outgoing calls.
By housing the printed circuit board with circuit components inside the cylindrical antenna and placing the circuit components (tuning inductance) that require shielding in the center, there is no need to prepare a separate shield case, making it more compact. And weight reduction can be achieved. In other words, the cordless telephone exclusively for receiving calls is small and lightweight, making it convenient to carry, and the function exclusively for receiving calls can be fully utilized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention. FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention. FIG. 3 is a diagram showing the configuration of a third embodiment of the present invention. FIG. 4 is a diagram showing the appearance of a conventional base unit and a cordless telephone. FIG. 5 is an exploded view showing the main built-in components of the cordless telephone. FIG. 6 is a sectional view showing the internal structure of the antenna. 11... Cordless telephone body, 12... Call switch, 13... Cap, 14... Microphone hole, 15... Earphone terminal, 16... Earphone, 17
... Antenna, 18... Battery, 19... Printed circuit board, 20... Microphone, 21... Tuning inductance, 22... Flexible printed circuit board, 4
1... Master unit, 42... Child unit, 43... Charger, 4
4...Dial button switch, 51.52...Printed circuit board, 53...Tuning inductance, 54...
...Shield case, 55...Telephone receiver, 56...Telephone transmitter, 57...Antenna, 58...Battery, 61...
- Antenna body, 62...outer cover. Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) In a cordless telephone that eliminates the dial button switch and is configured exclusively for receiving calls, a part of the antenna is formed into a cylindrical shape, and a circuit board is housed inside the antenna, and among the circuit components mounted on the circuit board, the shield is A cordless telephone characterized in that necessary circuit components are arranged approximately in the center of a cylindrical portion of the antenna. (2) The cordless telephone according to claim 1, wherein the circuit board is made of a flexible printed circuit board, and the flexible printed circuit board is formed into a cylinder and is housed in the cylindrical portion of the antenna.