JPH0350941A - telephone - 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 the Invention The present invention relates to telephones, such as automobile/portable telephones or cordless telephones, which use a combination of a magnet and a magnetically sensitive switch as a hook switch.

2. Description of the Related Art For example, a car telephone, as shown in FIG. 2, consists of a handset 1, a stand 2 capable of holding the handset 1, and a curl cord 4 with a connector 3 for electrically connecting them.

The handset 1 is equipped with functions necessary for transmitting and receiving calls, such as a button 5.

The hook switch consists of a magnetically sensitive switch 6 provided within the handset 1 and a magnet 7 provided within the stand 2, as shown in FIG. As another example, the stand 2 may be provided with a magnetically sensitive switch 6, and the handset 1 may be provided with a magnet 7. A hook switch is used to check the availability of a telephone line and to set whether or not to make a call. Mechanical hook switches are used in general telephones, but in the case of automobiles, mobile phones, etc., in order to make them as small, lightweight, and compact as possible, they are made of a combination of magnets and magnetically sensitive switches. A hook switch is used.

In the case of a car phone, the stand 2 is equipped with a holding mechanism for holding the handset 1 so that the handset 1 does not rattle or jump due to vibrations during driving. This holding mechanism includes hooks 12 and 13 that are horizontally retractable from slopes 10 and 11 provided on the stand 2 in correspondence with the inner slopes 8 and 9 of the handset 1.

The resin hooks 12 and 13 are attached to the fixing fittings 1, respectively.
4.15, each rear end surface and housing 16
Coil springs 19 and 20 are interposed between hanging walls 17 and 18 that extend from the inside of the ceiling wall, and are biased toward the outside. The tip surface of the hook 12.13 is formed into a wedge shape consisting of an upper slope and a lower slope,
The handset 1 is held and fixed to the stand 2 by the lower slope being engaged with a recess (not shown) provided in the inner slope 8.9 of the handset 1.

The positional relationship between the handset and receiver 1 is determined such that the magnetically sensitive switch 6 of the handset 1 is operated by the magnet 7 of the stand 2 when the handset 1 is held and fixed on the stand 2. The magnetically sensitive switch 6 is fixed to the lower part of the printed circuit board 21 inside the handset 1, and the magnet 7 is attached to the hanging wall 17 inside the ceiling wall of the housing 16.
The hook 12 is inserted into a recess 22 having one side of the hook 12, and is fixed by being pressed by the tip of the mounting bracket 14 that supports the hook 12. This mounting bracket 14 is attached to a screw 23 as shown in FIG.
It is fixed to the housing 16 by. Other mounting bracket 15
It is also fixed to the housing 16 with screws 24. In addition, 2
5 is a connector to which the connector 3 of the curl cord 4 is connected; 26 is a board that fixes the connector 25;
7 is a base plate. The board 26 is fixed to the base plate 27 with screws 28, and the housing 16 is fixed to the base plate 27 with screws 29.

Problems to be Solved by the Invention As described above, the magnets of conventional telephones of this type are fixed to the base or the case of the handset with screws using mounting brackets. Therefore, there are problems in that not only the number of parts and the number of assembly steps increase, but also the assembly workability is poor.

Furthermore, since this type of magnet generally uses a sintered magnet, there is little freedom in shape, and there are problems in dimensional accuracy in addition to brittleness. For this reason, when it is attached to a stand or a handset housing, the position is fixed due to variations in dimensional accuracy, which is not desirable, especially in the case of a car phone, as it will generate a chattering sound while driving. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an excellent telephone set that is easy to assemble and allows a magnet to be reliably attached.

Means for Solving the Problems In order to achieve the above object, the present invention uses a plastic magnet as a magnet, and uses a two-material injection molding method when molding the plastic magnet into a stand or a housing of a handset. It is molded in one piece.

Effect: Therefore, according to the present invention, the assembly work is simplified and the magnet is securely fixed, so that chattering noise can be prevented even when applied to a car phone.

EXAMPLE Hereinafter, the configuration of an example of the present invention will be explained with reference to FIG. 1. Since it is almost the same as the conventional example except for the magnet fixing structure, the same reference numerals used in the description of the conventional example will be used. Used for parts and parts. In FIG. 1, 16 is a housing molded from a thermoplastic resin such as ABS, and has a slope 10.11 corresponding to the inner slope 8.9 of the handset 1.
Hooks 12, 13 are provided there so as to be horizontally retractable.

The resin hooks 12 and 13 are supported by a single elongated fixing metal fitting 30, and coils are interposed between the respective rear end surfaces and hanging walls 17 and 18 suspended from the inside of the ceiling wall of the housing 16. They are each biased outwardly by springs 19 and 20. The tip surface of hook 12.13 is
It consists of a wedge-shaped upper slope and a lower slope, and the lower slope is engaged with a recess (not shown) provided on the inner slope 8.9 of the handset 1, so that the handset 1 is held and fixed on the stand 2.

The positional relationship between the two is determined so that the magnetically sensitive switch 6 of the handset 1 is operated by the plastic magnet 31 of the stand 2 when the handset 1 is held and fixed on the stand 2. The magnetically sensitive switch 6 is provided at the lower part of the printed circuit board 21 in the handset 1, and the plastic magnet 31 is integrally injection molded into the housing 16 along the hanging wall 17 on the inside of the ceiling wall.

The plastic magnet 31 is made of thermoplastic resin mixed with magnetic powder, and is integrally molded into the housing 16 by a two-material injection molding method. The two-material injection molding method is also called a two-color molding method, in which the housing 16 is first injection molded using a first mold, and then the housing 16 is placed in a second mold having a cavity for the plastic magnet 31. A molten resin material mixed with magnetic powder is injected into the cavity and solidified to be integrally molded with the housing, and then magnetized.

Next, the operation of this telephone will be explained. When the handset 1 is placed on the stand 2, the magnetically sensitive switch 6 is operated by the magnetic flux of the plastic magnet 31 and enters the on-footer state. In this state, when the ring tone sounds and the handset 1 is removed from the stand 2, the magnetically sensitive switch 6 is no longer affected by the magnetic flux of the plastic magnet 31, resulting in an off-hook state, and the central office detects this and switches the line to a talking state. Make it. When the communication is finished and the handset 1 is placed on the stand 2, the magnetically sensitive switch 6 is operated by the plastic magnet 31 again and becomes on-hook.

The above embodiment is an example in which a magnetically sensitive switch 6 is provided on the handset 1 and a plastic magnet 31 is provided on the stand 2. However, instead of this, a plastic magnet 31 is provided on the handset 1 and a magnetically sensitive switch 6 is provided on the stand 2. may be provided. in this case,
The plastic magnet 31 is integrally molded inside the lower housing 32 of the handset 1, and the magnetically sensitive switch 6 is molded inside the housing 1 of the base 2.
It is fixed inside the 6.

Effects of the Invention As is clear from the above embodiments, the present invention uses a plastic magnet as the magnet constituting the hook switch together with the magnetically sensitive switch, and this plastic magnet is integrally molded with the housing by a two-material injection molding method. There is no need to assemble the magnets during assembly, which simplifies the structure and reduces the number of parts and man-hours.

In addition, since there is no rattling due to variations in the dimensional accuracy of the magnet, when applied to a car phone, vibrations may occur while driving or chatter noises due to sound pressure and vibration when a speaker is installed in a stand for hands-free use. can be prevented. Furthermore, the use of plastic magnets increases the degree of freedom in shape and makes it possible to make the phone thinner, making it easier to integrate the plastic magnets into the handset.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a telephone stand according to an embodiment of the present invention, Fig. 2 is a perspective view showing an example of a conventional telephone, and Fig. 3 is a sectional view of the telephone shown in Fig. 2. FIG. 4 is an exploded perspective view of the stand in FIG. 2. 1... Handset, 2... Stand, 3... Connector,
4...Curl cord, 5...Button button, 6.
...Magnetic sensitive switch, 7... Magnet, 12.13...
Hook, 19.20...Coil spring, 30...Mounting bracket, 31...Plastic magnet. -1 Figure 2 Figure 2

Claims (1)

[Claims] A telephone equipped with a hook switch consisting of a magnet provided on one of a handset and a base, and a magnetically sensitive switch provided on the other, wherein the magnet is a plastic magnet, and the base or the handset casing is A telephone characterized in that it is integrally formed by a two-material injection molding method.